JP6602592B2 - Fluid pipe through hole blocking method and fluid pipe blocking device - Google Patents

Description

  The present invention is, for example, a construction that replaces or removes a through-hole closing device covered by a fluid pipe in an uninterrupted state while communicating with a through-hole of a fluid pipe such as a water pipe, or a through-hole of a fluid pipe In the construction of replacing or removing devices such as gate valves and air valves on the branch pipe side that are connected in an uninterrupted state, they are attached to the fluid pipe in a state where it communicates with the through hole of the fluid pipe or the through hole. The present invention relates to a fluid pipe through-hole blocking method and a fluid pipe blocking device for temporarily blocking a communication inflow portion in a fluid equipment in a retaining state.

As a fluid pipe shut-off device used in this type of fluid pipe through-hole shut-off method, for example, as shown in Patent Document 1, a branch pipe portion that is integrally formed with a fluid pipe and constitutes a part of the fluid pipe In particular, there is a fluid equipment attached to the pipe, and more specifically, a fluid equipment comprising a branch pipe connected to the branch pipe section, a gate valve and a working case.
In the fluid pipe shut-off device disclosed in Patent Document 1, a branch pipe portion of a fluid pipe is provided at a front end side portion of an operation shaft of an inner / outer double shaft structure that is detachably attached to a working case of a fluid equipment. Blocking means for blocking the through hole on the connection port side, insertion / extraction posture that can be inserted into the branch pipe part of the fluid pipe through the through hole from the communication inflow part in the fluid equipment, and the connection port side of the branch pipe part There are those provided with retaining means that can be switched to an engagement posture that engages with the opening periphery of the through hole on the inner surface of the through hole.

The blocking means includes an elastic annular body that is bulged and deformed radially outward between both pressing members provided on the distal end side of the outer shaft and the middle shaft constituting the operation shaft, and the proximal end of the middle shaft The screw shaft portion on the upper end side which is a portion is configured by screwing an operation nut that comes into contact with the upper end portion which is the base end portion of the outer shaft.
Then, the operation nut is operated to the tightening side, and the elastic annular body between the two pressing members is clamped radially outward by the relative proximity movement of the two pressing members accompanying the upward movement of the middle shaft with respect to the outer shaft. It bulges and deforms, and switches to the blocking state that blocks the through hole on the connection port side of the branch pipe section.

The retaining means includes a movable mounting cylinder that is externally mounted on a screw shaft portion that protrudes downward from a pressing member on the lower side, out of the middle shaft of the operation shaft, and is movable in the direction of the operation axis. There are provided press nuts that are screwed in such a manner that they can be pressed toward the lower pressing member side, and a plurality of circumferential positions of the movable mounting cylinder and the lower pressing member facing each other in the operation axis direction. A waist-folded link-type locking link that can be switched from an insertion / extraction posture that extends substantially along the central axis to an engagement posture that protrudes outward in the axial radial direction while bending in a lateral V-shape over a plurality of circumferential directions. It is composed of
When the operation nut is operated to the tightening side and the middle shaft is moved upward with respect to the outer shaft, the movable mounting cylinder is pressed and moved by the pressure nut that moves integrally with the middle shaft, and the locking link is bent. However, it is switched to the engagement posture projecting outward in the axial radial direction.
Further, when the operation nut is operated to the tightening side, the lower pressing member is pressed and moved toward the upper pressing member by the movable mounting cylinder.

JP 2005-133877 A JP 2002-340275 A

  In the above-described fluid pipe shut-off device, since the shut-off means and the retaining means are provided at the tip side portion of the operation shaft, for example, as shown in Patent Literature 2, the shut-off means is provided at the tip-side portion of the operation shaft. Compared to the case where a shaft fixing means for fixing and holding the operating shaft against the fluid pressure acting on the shut-off means in a shut-off state is provided between the ceiling portion of the control shaft and the protruding shaft portion of the operating shaft that protrudes to the outside. Thus, the entire apparatus can be made compact, and the switching operation between the locking state and the unlocking state of the retaining means and the switching operation between the blocking state and the blocking cancellation state of the blocking means can be performed efficiently and easily. It can be carried out.

  On the other hand, in the state where the locking means is being unlocked, the hip link type locking link is in an insertion / extraction posture extending substantially along the central axis, so the central shaft protruding from the pressing member on the lower end side of the blocking means The protruding length of the screw shaft portion becomes longer. Therefore, when the nominal diameter of the fluid pipe is small, there is not enough space to accommodate the protruding screw shaft part of the middle shaft between the through hole of the fluid pipe and the inner surface of the pipe facing it in the operation axis direction. There is a problem that the applicable range (the range of the nominal diameter of the applicable fluid pipe) of the fluid pipe blocking device is limited.

  In view of this situation, the main object of the present invention is to provide a fluid tube through hole blocking method and a fluid tube blocking device capable of expanding the range of application while promoting the compactness of the retaining means and the simplification of the structure. Is to provide

A first characteristic configuration according to the present invention is such that an operation shaft of a fluid pipe shut-off device is attached to a fluid equipment attached to the fluid pipe in a state of communicating with the through hole of the fluid pipe so as to be freely retracted and retracted. A retaining member provided at the tip of the operation shaft is inserted into the fluid pipe through the through hole from the communication inflow portion in the fluid equipment in an insertion / extraction posture, and the retaining member is inserted into the fluid pipe in the fluid pipe. Switching to an engagement posture that engages with the peripheral edge of the opening of the hole is performed, and the through-hole or the communication inflow portion in the fluid equipment communicating with the through-hole is blocked by the blocking means provided on the tip end side of the operation shaft. Shut-off work process;
A shut-off release operation step of releasing the shut-off means and passing the through-hole through the through-hole in a state in which the retaining member is switched to the insertion / extraction posture and pulling out to the communication inflow portion in the fluid equipment. A through hole blocking work method,
In the blocking operation step, the retaining member is held in the insertion / removal posture by the posture holding portion that holds the retaining member pivotably attached to the tip end portion of the operation shaft in the insertion / removal posture. The posture holding portion is inserted into the fluid pipe through the through hole from the communication inflow portion in the fluid equipment, and the inserted retaining member is brought into contact with the inner surface of the fluid pipe. Switch the retaining member to the engaged posture against the holding force,
In the blocking release operation step, the tip end portion of the operation shaft is moved in the diameter direction of the through hole, and only one end portion of the retaining member is engaged with the opening peripheral edge of the through hole on the inner surface of the fluid pipe. In this state, by pulling out the operating shaft, the through hole is passed through while the switching member is switched to the insertion / extraction posture .

According to the above configuration, in the shut-off operation process, after the retaining member in the fluid equipment is inserted and removed and passed through the through hole of the fluid pipe, the retaining member is switched to the engaged posture in the fluid pipe. By engaging the retaining member in the engaging posture with the opening peripheral edge of the through hole in the inner surface of the fluid pipe, it is possible to reliably prevent the movement of the blocking means that blocks the through hole of the fluid pipe.
In the blocking release work process, the blocking means blocking the through hole of the fluid pipe is released from blocking, and the retaining member engaging with the opening periphery of the through hole on the inner surface of the fluid pipe is inserted and removed. By switching the operation, the retaining member can be passed through without being caught by the opening periphery of the through hole and pulled out to the communication inflow portion in the fluid equipment.
In addition, since the switching operation to at least one of the switching operation to the engagement posture or the insertion / extraction posture of the retaining member can be performed by contact with the fluid pipe, the conventional through-hole blocking work method for the fluid pipe Compared to the above, the number of members and the space for switching the retaining member can be reduced.

  Therefore, by providing a blocking means and a retaining member at the distal end portion of the operating shaft, while simplifying the posture switching structure of the retaining member while reducing the size of the entire device and making the switching work more efficient and easier. Compacting can be promoted, and the application range can be expanded by reducing the nominal diameter of the fluid pipe that can be applied.

Further, in the shut-off operation process, the retaining member is operated to push in the operation shaft held in the posture holding portion in the insertion / extraction posture. Thereby, not only can the retaining member be surely passed through the through hole of the fluid pipe, but the retaining member is in an insertion / extraction posture by contacting the inner surface of the pipe facing the through hole in the operation axis direction. The retaining member is reliably switched to the engaged posture against the posture holding force of the posture holding portion.
In addition, in the shut-off release operation process, only the one end of the retaining member is engaged with the opening periphery of the through hole on the inner surface of the pipe by moving the tip of the operation shaft in the diameter direction of the through hole. By pulling out the operating shaft in this state, the other end of the retaining member swings in a state of preceding entry into the through hole, and the retaining member is switched to the insertion / extraction posture and the through hole is reliably secured. Pass smoothly.
Therefore, when switching the retaining member to the engagement posture or the insertion / removal posture, only the push-pull operation of the operation shaft and the movement operation in the diameter direction of the through hole are required, so the posture switching work of the retaining member can be performed efficiently. It can be done easily.

The second characteristic configuration according to the present invention is such that an operating shaft of a fluid pipe shut-off device is attached to a fluid equipment attached to the fluid pipe in a state of communicating with the through hole of the fluid pipe so as to be freely retracted and retracted. A retaining member provided at the tip of the operation shaft is inserted into the fluid pipe through the through hole from the communication inflow portion in the fluid equipment in an insertion / extraction posture, and the retaining member is inserted into the fluid pipe in the fluid pipe. Switching to an engagement posture that engages with the peripheral edge of the opening of the hole is performed, and the through-hole or the communication inflow portion in the fluid equipment communicating with the through-hole is blocked by the blocking means provided on the tip end side of the operation shaft. Shut-off work process;
A shut-off release operation step of releasing the shut-off means and passing the through-hole through the through-hole in a state in which the retaining member is switched to the insertion / extraction posture and pulling out to the communication inflow portion in the fluid equipment. A through hole blocking work method,
In the blocking work process, the constituent member of the retaining member can be switched between an engagement posture along the axial direction of the operation shaft and an insertion / removal posture constricted and swung toward the proximal end side of the operation shaft. In addition, a plurality of retaining members pivotally attached to the operation shaft in a state of being biased to the engagement posture are brought into contact with the inner surface of the through hole formed in the tube wall of the fluid pipe And passing through the through-hole while switching and swinging to the insertion / extraction posture, and after the passage, the plurality of retaining members are returned to the engagement posture by the biasing force in the posture toward the tube axis along the tube axis,
In the shut-off release work step, the plurality of retaining bodies are changed from the attitude toward the tube axis to the pipe radial orientation along the diameter direction of the fluid pipe by rotating the operation shaft. The abutment with the arcuate inner surface of the fluid pipe causes the plurality of retaining members to be squeezed and swung, and in this state, the operation shaft is pulled out, whereby the arcuate inner surface of the fluid pipe and the inner surface of the through-hole By the contact, the plurality of retaining members are squeezed to the insertion / extraction posture and swung to pass through the through hole.

According to the above configuration, in the shut-off operation process, even if the plurality of retaining members constituting the retaining member are biased and held in the engagement posture in the fluid equipment, a plurality of the retaining members are accompanied by the pushing operation of the operation shaft. When the retaining body comes into contact with the inner surface of the through hole formed in the tube wall of the fluid pipe, the retaining body squeezes and swings toward the proximal end side of the operating shaft against the biasing force, and the retaining body It passes through the through hole reliably and smoothly while being switched to the insertion / extraction posture.
In addition, when passing through the through hole, the plurality of retaining members are returned to the engaged posture by the biasing force in the posture toward the tube axis along the tube axis, so that a special operation for switching to the engaged posture is performed. It becomes unnecessary.

In the shut-off release operation process, when the operation shaft is rotated to change the plurality of retaining bodies from the tube axis orientation to the tube diameter orientation along the diameter direction of the fluid pipe, a circle continuous to the inner surface of the through hole A plurality of retaining members come into contact with the arcuate inner surface and swing. When the operating shaft is pulled out in this state, the plurality of retaining members are swung to the insertion / extraction posture while moving from the arcuate inner surface to the inner surface of the through hole in a contact state, and the plurality of retaining members are Passes reliably and smoothly without being caught on the periphery of the opening.
Accordingly, since only the push-pull operation and the rotation operation of the operation shaft are required to switch the retaining member to the engagement posture or the insertion / removal posture, the posture switching of the retaining member can be performed efficiently and easily.

A third characteristic configuration according to the present invention is such that an operating shaft of a fluid pipe blocking device is attached to a fluid equipment attached to the fluid pipe in a state of communicating with the through hole of the fluid pipe so as to be freely retracted and retracted. A retaining member provided at the tip of the operation shaft is inserted into the fluid pipe through the through hole from the communication inflow portion in the fluid equipment in an insertion / extraction posture, and the retaining member is inserted into the fluid pipe in the fluid pipe. Switching to an engagement posture that engages with the peripheral edge of the opening of the hole is performed, and the through-hole or the communication inflow portion in the fluid equipment communicating with the through-hole is blocked by the blocking means provided on the tip end side of the operation shaft. Shut-off process,
A shut-off release operation step of releasing the shut-off means and passing the through-hole through the through-hole in a state in which the retaining member is switched to the insertion / extraction posture and pulling out to the communication inflow portion in the fluid equipment. A through hole blocking work method,
In the shut-off operation step, the engagement member is configured to be held on the operation shaft so as to be movable in the axial radial direction by the constituent member of the retaining member, and to project outwardly in the axial radial direction; A plurality of retaining bodies that can be switched to an insertion / extraction posture that has been retracted and moved inward in the axial radial direction is set to an insertion / extraction posture, and the passage through the through hole formed in the wall of the fluid pipe is allowed to pass. Later, by a movable pressing portion provided at the distal end portion of the operation shaft, the plurality of retaining members are pressed in a posture toward the tube axis along the tube axis to project and move to the engagement posture,
In the shut-off release operation step, the pressure by the movable pressing portion is released, and the plurality of retaining bodies are moved from the tube axis core orientation to the diameter direction of the fluid pipe by rotating the operation shaft. When the posture is changed, the plurality of retaining members are retracted by contact with the arcuate inner surface of the fluid pipe when the posture is changed, and the operation shaft is pulled out in this state to thereby draw the arcuate shape of the fluid pipe. The plurality of retaining members are retracted to the insertion / extraction posture by contact with the inner surface and the inner surface of the through-hole to pass through the through-hole.

According to the above configuration, in the shut-off operation process, when the plurality of retaining members that are constituent members of the retaining member are in an insertion / removal posture in which they are retreated inward in the axial radial direction, the operation shaft is pushed in In accordance with the operation, the plurality of retaining members smoothly pass through the through holes formed in the pipe wall of the fluid pipe.
Further, even if a part of the plurality of retaining bodies protrudes outward in the axial radial direction from the through hole, the retaining body that is in a projecting state as the operating shaft is pushed is a through hole of the fluid pipe. Since the retaining member is retracted and moved to the insertion / removal posture, the retaining member passes reliably and smoothly without being caught by the opening periphery of the through hole of the fluid pipe.
After passing, due to the pressing action of the movable pressing portion provided at the distal end portion of the operation shaft, the plurality of retaining members project and move outward in the axial radial direction and are switched to the engaged posture.

In the shut-off release operation process, the operation shaft is rotated after releasing the pressing of the movable pressing portion, and the plurality of retaining members are oriented in the pipe radial direction along the diameter direction of the fluid pipe from the orientation of the pipe axis along the pipe axis. When the change is made, the plurality of retaining members come into contact with the arcuate inner surface continuous with the inner surface of the through hole of the fluid pipe and retreat. When the operating shaft is pulled out in this state, the plurality of retaining members are retreated to the insertion / removal posture while moving in contact with the inner surface of the through hole from the arcuate inner surface of the fluid pipe, and the retaining member is opened in the through hole. Passes reliably and smoothly without getting caught on the periphery.
Therefore, the posture switching of the retaining member can be easily and efficiently performed.

According to a fourth aspect of the present invention, there is provided a fluid pipe through hole blocking work method including the first characteristic configuration described above, wherein only one end of the retaining member is engaged with the opening periphery of the through hole. When the retaining member is switched and swung to the insertion / removal posture by pulling out the operation shaft in a state where the operation shaft is pulled, the retaining member is temporarily held in the insertion / removal posture by the posture holding portion. In the point.

  According to the above configuration, when the retaining member is switched and swung to the insertion / removal posture by pulling out the operation shaft, the retaining member that has reached the insertion / removal posture returns to the engagement posture by reaction and swings. This can be suppressed, and the through-hole can be reliably and smoothly passed in a state where the retaining member is held in the insertion / extraction posture.

According to a fifth characteristic configuration of the present invention, the penetrating portion of the operating shaft that can be moved in and out of the fluid equipment attached to the fluid pipe in a state of communicating with the through hole of the fluid pipe is provided in the penetrating portion. A blocking means for blocking a communication inflow portion in the fluid equipment communicating with the hole or the through hole, an insertion / extraction posture capable of being inserted into the fluid pipe through the through hole from the communication inflow portion in the fluid equipment, and A shutoff device for a fluid pipe provided with a retaining means provided with a retaining member that can be switched to an engagement posture that engages with the opening periphery of the through hole on the inner surface of the fluid pipe;
Posture switching execution means for performing switching operation to at least one of the switching operation to the engagement posture or the insertion / extraction posture of the retaining member by contact with the fluid pipe ,
The posture switching execution means includes a swing pivot structure for pivotably pivoting the retaining member between the insertion / extraction posture and the engagement posture with respect to the distal end portion of the operation shaft, and the fluid equipment. The operation shaft can be held in the insertion / removal posture, and the shaft support portion in which the tip portion of the operation shaft can move in the diameter direction of the through-hole can be held in the insertion / removal posture. There is a posture holding portion that allows the swinging member to be switched to the engaged posture by the contact between the retaining member and the inner surface of the fluid pipe .

According to the above configuration, in the shut-off operation process, after the retaining member of the retaining means in the fluid equipment is inserted and removed and passed through the through hole of the fluid pipe, the retaining member is engaged in the fluid pipe. The retaining member in the engagement posture is engaged with the opening peripheral edge of the through hole in the inner surface of the fluid pipe, so that the blocking means for blocking the through hole of the fluid pipe can be reliably prevented from moving out. it can.
In the blocking release work process, the blocking means blocking the through hole of the fluid pipe is released from blocking, and the retaining member engaging with the opening periphery of the through hole on the inner surface of the fluid pipe is inserted and removed. By switching the operation, the retaining member can be passed through without being caught by the opening periphery of the through hole and pulled out to the communication inflow portion in the fluid equipment.
Moreover, since the switching operation to the engagement posture or the insertion / extraction posture of the retaining member can be performed by the posture switching execution means by switching to at least one of them by contact with the fluid tube, the conventional fluid tube Compared with the through hole blocking work method, the number of members and the space for switching the retaining member can be reduced.

  Therefore, by providing a blocking means and a retaining member at the distal end portion of the operating shaft, while simplifying the posture switching structure of the retaining member while reducing the size of the entire device and making the switching work more efficient and easier. Compacting can be promoted, and the application range can be expanded by reducing the nominal diameter of the fluid pipe that can be applied.

Furthermore, in the shut-off operation process, the retaining member is held in the insertion / removal posture by the posture holding unit of the posture switching execution means, and the operation shaft is pushed in in this state. As a result, not only the retaining member can be surely passed through the through hole of the fluid pipe, but also the retaining member held in the insertion / extraction posture contacts the inner surface of the pipe facing the through hole in the operation axis direction. Then, the retaining member can be reliably switched and swung to the engaged posture against the posture holding force by the posture holding portion.
Moreover, in the shut-off release operation process, only the one end portion of the retaining member is moved to the through hole in the inner surface of the pipe by moving the tip end portion of the operation shaft in the diameter direction of the through hole by the shaft support portion of the posture switching execution means. Engage with the periphery of the opening. By pulling out the operating shaft in this state, the other end of the retaining member swings in a state of preceding entry into the through hole, and the retaining member is switched to the insertion / extraction posture and the through hole is reliably secured. Pass smoothly.
Therefore, even when the retaining member is switched to the engagement posture or the insertion / removal posture, only the push-pull operation of the operation shaft and the movement operation in the diameter direction of the through hole are required, so the posture switching of the retaining member of the retaining means can be performed. Can be performed efficiently and easily.

According to a sixth characteristic configuration of the present invention, the penetrating portion of the operating shaft that can be operated in and out of the fluid equipment attached to the fluid pipe in a state communicating with the through hole of the fluid pipe is provided in the penetrating portion. A blocking means for blocking a communication inflow portion in the fluid equipment communicating with the hole or the through hole, an insertion / extraction posture capable of being inserted into the fluid pipe through the through hole from the communication inflow portion in the fluid equipment, and A shutoff device for a fluid pipe provided with a retaining means provided with a retaining member that can be switched to an engagement posture that engages with the opening periphery of the through hole on the inner surface of the fluid pipe;
Posture switching execution means for performing switching operation to at least one of the switching operation to the engagement posture or the insertion / extraction posture of the retaining member by contact with the fluid pipe,
The posture switching execution means is a constituent member of the retaining member, and swings by constricting the engagement posture along the axial direction of the operation shaft at the distal end portion of the operation shaft and the proximal end side of the operation shaft. A plurality of retaining bodies provided to be swingably switchable between the insertion and removal postures, and the through-holes that hold the retaining members in the engagement posture and are formed in the wall of the fluid pipe By urging and supporting the operation shaft with respect to the fluid equipment, the urging holding portion that allows the swinging movement of the retaining body to the insertion / extraction posture accompanying the contact with the inner surface of the hole, A shaft rotation support portion is provided that allows the plurality of retaining members to be freely changed to a tube axis orientation along the tube axis direction of the fluid tube and a tube diameter orientation along the diameter direction of the fluid tube. There is in point.

According to the above configuration, in the shut-off operation process, the plurality of retaining members constituting the retaining member are biased and held in the engagement posture within the fluid equipment by the biasing holding portion of the posture switching execution unit. In addition, when the plurality of retaining bodies come into contact with the inner surface of the through-hole formed in the pipe wall of the fluid pipe as the operating shaft is pushed, the retaining bodies resist the urging force and the proximal end of the operating shaft. The retaining member is swung to the side, and passes through the through-hole reliably and smoothly while the retaining member is switched to the insertion / extraction posture.
Further, when passing through the through-hole, the plurality of retaining members are returned to the engaged posture by the urging force of the urging holding portion in the posture toward the tube axis along the tube axis, so that it is switched to the engaged posture. No special operation is required.

In the shut-off release operation process, the operation shaft is rotated in the shaft rotation support portion of the posture switching execution means, and the plurality of retaining bodies are moved from the tube axis direction along the tube axis direction along the diameter direction of the fluid pipe. When the posture is changed to the tube diameter orientation, the plurality of retaining members come into contact with the arcuate inner surface that is continuous with the inner surface of the through hole of the fluid tube, and swing and swing. When the operating shaft is pulled out in this state, the plurality of retaining members are swung to the insertion / extraction posture while moving from the arcuate inner surface to the inner surface of the through hole in a contact state, and the plurality of retaining members are Passes reliably and smoothly without being caught on the periphery of the opening.
Therefore, since only the push-pull operation and the rotation operation of the operation shaft are required for switching the swinging member to the engagement posture or the insertion / removal posture, the posture switching of the retaining member of the retaining means can be performed efficiently and easily. be able to.

According to a seventh characteristic configuration of the present invention, the penetrating portion of the operating shaft that can be moved in and out of a fluid device attached to the fluid pipe in a state of communicating with the through hole of the fluid pipe is provided in the penetrating portion. A blocking means for blocking a communication inflow portion in the fluid equipment communicating with the hole or the through hole, an insertion / extraction posture capable of being inserted into the fluid pipe through the through hole from the communication inflow portion in the fluid equipment, and A shutoff device for a fluid pipe provided with a retaining means provided with a retaining member that can be switched to an engagement posture that engages with the opening periphery of the through hole on the inner surface of the fluid pipe;
Posture switching execution means for performing switching operation to at least one of the switching operation to the engagement posture or the insertion / extraction posture of the retaining member by contact with the fluid pipe,
The posture switching execution means is a constituent member of the retaining member, and is provided at the distal end portion of the operation shaft so as to be movable in and out of an engagement posture and an insertion / removal posture, and an arcuate inner surface of the fluid pipe and A plurality of retaining members that are retreated in contact with the inner surface of the through-hole formed in the tube wall of the fluid tube, and a pressing member that presses the retaining member to project and move to an engagement posture. A releasable movable pressing portion, and the operation shaft is rotatably supported with respect to the fluid equipment, so that the retaining body is positioned toward the tube axis along the tube axis direction of the fluid tube and the fluid. An axial rotation support portion that can be changed to a posture in the tube radial direction along the diameter direction of the tube is provided.

According to the above configuration, in the shut-off operation step, when the plurality of retaining bodies that are constituent members of the retaining member are in an insertion / extraction posture that is retreated inward in the axial radial direction, the operation shaft is pushed in In accordance with the operation, the plurality of retaining members smoothly pass through the through hole.
Further, even if a part of the plurality of retaining bodies protrudes outward in the axial radial direction from the through hole of the fluid pipe, the retaining body that is in the projecting state in accordance with the pushing operation of the operating shaft is the fluid pipe. The retaining member is retracted and moved to the insertion / removal posture while being in contact with the inner surface of the through-hole, so that the retaining member passes surely and smoothly without being caught by the opening periphery of the through-hole of the fluid pipe.
After the passage, the plurality of retaining members are reliably projected and moved to the engagement posture in the posture toward the tube axis along the tube axis by the pressing action of the movable pressing portion of the posture switching execution means.

In the disconnection release operation process, after the movable pressing portion is released, the operation shaft is rotated at the shaft rotation support portion of the posture switching execution means, and the plurality of retaining bodies are moved from the tube axis orientation toward the diameter direction of the fluid pipe. When the posture is changed to the pipe radial orientation, the plurality of retaining members come into contact with the arcuate inner surface continuous with the inner surface of the through hole of the fluid pipe and retreat. When the operating shaft is pulled out in this state, the plurality of retaining members are retreated to the insertion / removal posture while moving from the arcuate inner surface of the fluid pipe to the inner surface of the through hole, and the retaining member is opened to the through hole. Passes reliably and smoothly without getting caught on the periphery.
Therefore, the posture switching of the retaining member can be easily and efficiently performed.

Eighth characterizing feature of the of the present invention is a shut-off device for a fluid tube with any one of the characteristic feature of the fifth to seventh mentioned above, the operating shaft is configured in and out dual shaft construction, the blocking means Is provided on the distal end side of the operation shaft, and is configured to be switchable between a cut-off state and a cut-off release state by relative movement of the middle shaft and the outer shaft of the operation shaft in the operation axis direction. The tip of the center shaft is provided with the retaining member of the retaining means at the tip portion protruding from the blocking means.

  According to the said structure, a interruption | blocking means can be switched to a interruption | blocking state and a interruption | blocking cancellation | release state by the relative movement in the operation-axis center direction of the center axis | shaft which comprises the operation axis | shaft of an inner / outer double shaft structure. In addition, since the retaining member is provided at the tip of the central shaft that protrudes from the blocking means, it is possible to easily switch between the engagement posture and the insertion / removal posture of the retaining member.

Longitudinal sectional view of the fluid pipe blocking device showing the first embodiment when mounted Enlarged longitudinal sectional view of shut-off means and retaining means of shut-off device for fluid pipe Partially disassembled enlarged longitudinal sectional view of the operation part of the shutoff device for fluid pipes Enlarged longitudinal sectional view of the main part when inserting the bottom of the retaining means of the shutoff device for fluid pipes Longitudinal sectional view of the fluid pipe breaker when the outer shaft and the middle shaft are unfixed Longitudinal sectional view at the time of retaining engagement of retaining means of the shutoff device for fluid pipe Longitudinal sectional view during shut-off operation of shut-off means of shut-off device for fluid pipe Longitudinal cross section when replacement equipment is removed Longitudinal sectional view during movement operation of retaining means of fluid pipe shut-off device Longitudinal sectional view of the fluid pipe shut-off device when the retaining means is pulled up Longitudinal section of through hole closing jig after completion of construction The longitudinal section at the time of wearing of the shutoff device for fluid pipes showing a 2nd embodiment Longitudinal cross-sectional view of fluid pipe shut-off device when passing through through hole Longitudinal sectional view at the time of return of the engagement posture in the pipe of the retaining means of the shutoff device for the fluid pipe Longitudinal sectional view when changing the fixed position of the outer shaft and the middle shaft of the shutoff device for fluid pipe Longitudinal sectional view at the time of retaining engagement of retaining means of the shutoff device for fluid pipe Longitudinal sectional view during shut-off operation of shut-off means of shut-off device for fluid pipe Longitudinal cross section when replacement equipment is removed Cross-sectional view during operation of 90 ° rotation of the operating shaft of the shut-off device for fluid pipes Cross-sectional view of fluid pipe shutoff device when it is passed through through hole Longitudinal sectional view at the time of mounting of the fluid pipe shut-off device showing the third embodiment Enlarged longitudinal sectional view of shut-off means and retaining means of shut-off device for fluid pipe Longitudinal sectional view of the retaining means when passing through the through hole Longitudinal sectional view when the blocking means and the retaining means are inserted into predetermined positions in the pipe Longitudinal sectional view when the retaining member of the retaining means protrudes to the engagement posture Longitudinal sectional view at the time of retaining engagement of retaining means of the shutoff device for fluid pipe Longitudinal sectional view during shut-off operation of shut-off means of shut-off device for fluid pipe Longitudinal cross section when replacement equipment is removed Cross-sectional view during operation of 90 ° rotation of the operating shaft of the shut-off device for fluid pipes Cross-sectional view of fluid pipe shutoff device when it is passed through through hole

[First Embodiment]
1 to 3 show a continuous water state (non-continuous flow state) of the through-hole closing device B (see FIG. 11) that closes the through-hole 2 formed in the pipe wall 1A of the water pipe 1 which is an example of a fluid pipe. 1 shows a fluid pipe shut-off device A for executing a fluid pipe shut-off work method for shutting off a through-hole 2 of a water pipe 1 in a retaining state in the equipment replacement work to be replaced by.
FIG. 11 shows a new through-hole closing device B after completion of construction, but the structure is the same as the through-hole closing device B to be replaced before construction.
Therefore, in FIG. 1, compared to FIG. 11, the connection pipe part (having a function as a branch pipe part) 3 </ b> C of the split T-shaped pipe 3 having a divided structure that is externally fixed to the water pipe 1 in a watertight state. The cap 4 that is screwed and attached in a watertight state and the detachment prevention presser cover 5 that presses and fixes the cap 4 to the connecting tube portion 3C of the split T-shaped tube 3 are removed.
Further, in FIG. 1, the connecting flange 3 d of the connecting pipe portion 3 C of the split T-shaped pipe 3, which is a remaining part of the through-hole closing device B to be replaced, is opened and closed along the tube axis X direction of the water pipe 1. The valve box 6b of the working on-off valve 6 including the valve body 6a is fixedly connected in a watertight state by tightening a bolt 10A screwed into the valve box 6b from the horizontal direction.
At the downstream side connection port portion of the valve box 6b of the work opening / closing valve 6, a replacement work case (an example of a work case) 7 of the fluid pipe shutoff device A is screwed into the valve box 6b from the horizontal direction. It is fixedly connected in a watertight state by a tightening operation of 10B.

  And in this embodiment, the above-described split T-shaped tube 3, the work on-off valve 6 and the replacement work case 7 are connected to the water pipe 1 in a state of communicating with the through-hole 2 of the pipe wall 1 </ b> A of the water pipe 1. An attached fluid equipment C is configured. The communication inflow part 8 in the fluid equipment C is configured with an internal space (branch flow path) of the connection pipe part 3 </ b> C of the split T-shaped pipe 3.

The work of removing the cap 4 and the detachment prevention presser cover 5 of the through-hole blocking device B to be replaced and the work of fixing and connecting the valve box 6b of the work opening / closing valve 6 to the split T-shaped pipe 3 as the remaining parts are performed before construction. The replacement work area including the entire through-hole blocking device B to be replaced is performed in a waterless state in a housing (not shown) that covers the watertight state.
The fixed connection work of the replacement work case 7 of the fluid pipe shut-off device A is performed on the valve box 6b of the work on-off valve 6 in the closed state after the housing is removed.

As shown in FIGS. 1 and 11, the split T-shaped pipe 3 is composed of upper and lower split joint bodies 3 </ b> A and 3 </ b> B that are divided into two in the pipe circumferential direction that can be sheathed from the pipe radial direction with respect to the water pipe 1. The adjacent end portions of both split joint bodies 3A and 3B sheathed on the water pipe 1 are detachably attached to both ends of the split joint bodies 3A and 3B via a plurality of bolts 9A and nuts 9B. Connecting portions 3a and 3b for fixedly connecting to each other are integrally formed.
Further, at the center part in the tube axis direction in the upper split joint body 3B and at the center part in the pipe circumferential direction, the pipe hole 1 is formed from the pipe radial direction with respect to the through-hole 2 formed in the pipe wall 1A. A connecting pipe portion 3C having a connecting hole 3e communicating therewith is integrally formed. The diameter of the connection hole 3 e of the connection pipe portion 3 C is configured to be slightly larger than the diameter of the through hole 2.

  The fluid pipe shut-off device A is provided with an operation shaft 11 having an inner / outer double shaft structure that is supported in a penetrating manner so that it can be withdrawn / retracted from the replacement work case 7 constituting the fluid equipment C. In the lower end side portion, which is the front end side of the operation shaft 11, a blocking means D for blocking the through hole 2 in a watertight manner, and a water supply pipe that passes through the connection hole 3 e and the through hole 2 from the communication inflow portion 8 in the fluid equipment C. A retaining member 12 that can be inserted into the pipe 1 is provided, and the retaining member 12 is engaged with an insertion / extraction posture capable of passing through the through hole 2 and an opening peripheral edge of the through hole 2 in the arcuate inner surface 1 a of the water pipe 1. The retaining means E is provided so as to be switchable between the engagement postures.

Further, the fluid pipe shutoff device A performs posture switching execution in which the switching operation of the retaining member 12 from the insertion / extraction posture to the engagement posture and the switching operation from the engagement posture to the insertion / removal posture are executed by contact with the water pipe 1. Means F are provided.
The posture switching execution means F includes a swinging and pivoting structure F1 for pivotably pivoting the retaining member 12 to a lower end portion that is a tip portion of the operation shaft 11 so as to be switched between an insertion / extraction posture and an engagement posture. The operation shaft 11 is connected to the fluid equipment C so that only one end of the retaining member 12 engages with the opening periphery of the through hole 2 in the arcuate inner surface 1a of the water pipe 1. The shaft support portion F2 that is movably supported in the diametrical direction 2 and the retaining member 12 can be held in an insertion / extraction posture, and with the contact between the retaining member 12 and the arcuate inner surface 1a of the water pipe 1 And a posture holding portion F3 that allows the retaining member 12 to be switched to the engaged posture against the posture holding force by the external force acting in the swing direction.

The operation shaft 11 is configured by fitting a cylindrical outer shaft 11A and a middle shaft 11B so as to be relatively movable in the direction of the operation axis Y and relatively rotatable about the operation axis Y.
A pair of operation handles 14 and 15 using bolts are detachably engaged with nuts 13 provided at two locations in the circumferential direction of the upper end, which is the base end of the outer shaft 11A. One operation handle 14 can selectively engage with an upper engagement recess 16 and a lower engagement recess 17 formed at two locations on the upper and lower sides of the middle shaft 11B through the insertion hole 11a of the outer shaft 11A. An engaging projection 14a is integrally formed.
In a state where the engagement convex portion 14a of one operation handle 14 is engaged with the upper engagement recess 16 of the middle shaft 11B, the relative movement in the operation shaft core Y direction between the outer shaft 11A and the middle shaft 11B and the operation shaft core. Since the relative rotation around Y is prevented, the outer shaft 11A and the middle shaft 11B move integrally.
Further, in a state where the engagement convex portion 14a of one operation handle 14 is engaged with the lower engagement concave portion 17 of the middle shaft 11B, the operation axis Y between the engagement convex portion 14a and the lower engagement concave portion 17 is obtained. Between the opposing surfaces in the direction, the blocking elastic body 22 of the blocking means D is expanded from the blocking release state smaller than the diameter of the through hole 2 of the water pipe 1 to block the through hole 2, or An interchange S1 (see FIG. 7) that secures an operation stroke for switching from the shut-off state to the shut-off release state is formed.

The blocking means D includes an upper pressing member 20 attached to the lower end portion of the outer shaft 11A, and a lower pressing member attached to the upper pressing member 20 so as to be relatively slidable within a certain range in the operation axis Y direction. 21, rubber blocking elastic body 22 disposed between the pressing surfaces of both pressing members 20, 21, and screw shaft portion 11 b on the upper end side of middle shaft 11 </ b> B in a state where the upper end surface of outer shaft 11 </ b> A can be pressed. It is comprised from the expansion nut 23 screwed together.
The lower pressing member 21 is integrally formed with a connecting cylinder portion 21a that slidably enters from below between the inner peripheral surface of the upper pressing member 20 and the outer peripheral surface of the central shaft 11B. Engaging groove portions 25 are formed at two locations in the circumferential direction of the outer peripheral surface of the connecting cylinder portion 21a. The engaging groove portions 25 are engaged with the end portions of the retaining bolts 24 screwed from the outer surface side of the upper pressing member 20.
As shown in FIG. 2, between the engagement groove portion 25 and the front end portion of the retaining bolt 24 in the operation axis Y direction, the blocking elastic body 22 is blocked from the blocking release state or the blocking state. Is formed to allow expansion / contraction operation of the pressing members 20 and 21 (relative movement of the pressing members 20 and 21 in the direction of the operation axis Y) to switch the operation to the release state.

  When the expansion nut 23 is screwed to the tightening side, the outer shaft 11A is pushed downward with respect to the middle shaft 11B as shown in FIGS. 7 and 8, and the pressing surface (blocking) of the lower pressing member 21 is cut. Is smaller than the diameter of the through hole 2 of the water pipe 1 due to the clamping action accompanying the proximity movement of the pressing surface of the upper pressing member 20 (the surface contacting the elastic body 22 for blocking) to the elastic body 22 for contact). The blocking elastic body 22 in an unblocking state is elastically deformed into a blocking state in which the diameter is increased to an outer diameter larger than the diameter of the through hole 2, and the through hole 2 of the water pipe 1 is in a watertight (sealed) state. Can be blocked.

The total length W (see FIG. 4) of the retaining member 12 of the retaining means E, that is, the total length W between the maximum outer surfaces of the two protrusions 12c of the retaining member 12 is based on the diameter of the through hole 2 of the water pipe 1. There is also a great structure. A boss portion 12A formed at the central portion in the longitudinal direction of the retaining member 12 is pivotally attached to the lower end portion of the central shaft 11B so as to be swingable in the vertical direction around a pivot pin 18 that is horizontal.
The boss 12A of the retaining member 12 and the pivot pin 18 constitute a swing pivot attachment structure F1 of the posture switching execution means F.

The side surfaces at both ends in the longitudinal direction of the retaining member 12 are formed on the inclined side surfaces 12a located on the upper side toward the outer side in the longitudinal direction, and the inclined side surfaces 12a are inclined at both longitudinal ends of the upper surface 12b of the retaining member 12. A protrusion 12c that protrudes upward along the direction is integrally formed.
Both protrusions 12c of the retaining member 12 are engaged with the opening periphery of the through hole 2 in the arc-shaped inner surface 1a of the water pipe 1 in a horizontal state parallel to the tube axis X direction, and this engagement state is the operation shaft. 11 is an engagement posture that prevents the movement of 11 from coming out.
Further, as shown in FIG. 2, in the inclined state where one protrusion 12c of the retaining member 12 is in contact with or close to the outer surface of the intermediate shaft 11B, the width W1 between the outer surfaces of the retaining member 12 in the tube axis X direction. Becomes smaller than the diameter of the through-hole 2, and this state is an insertion / extraction posture that can pass through the through-hole 2.

  When the blocking elastic body 22 of the blocking means D is switched to the blocking state, both protrusions 12c of the retaining member 12 engage with the opening periphery of the through hole 2 in the arc-shaped inner surface 1a of the water pipe 1. In addition, the lower surface 21b of the pressing portion of the lower pressing member 21 of the blocking means D is in contact with the upper surface 12b of the retaining member 12. Therefore, when the expansion nut 23 is operated to the tightening side, the lower pressing member 21 does not move, and only the upper pressing member 20 provided on the outer shaft 11A moves downward.

  The shaft support portion F2 of the posture switching execution means F includes a spherical body 30 slidably mounted on the outer shaft 11A in a watertight manner, and an inner surface of the shaft mounting opening 7b of the ceiling case portion 7a of the replacement work case 7. A lower spherical receiving surface 31 formed on the upper and lower spherical receiving surfaces 31 that are rotatably supported by the lower spherical receiving surface 31 of the replacement work case 7. In addition, the presser member 33 is configured to be fixedly coupled to the ceiling case portion 7a of the replacement work case 7 in a watertight state so as to prevent the spherical body 30 from coming off.

  The lower end portion of the center shaft 11B is formed with the spherical body 30 rotatably supported by the lower spherical receiving surface 31 of the replacement work case 7 and the upper spherical receiving surface 32 of the pressing member 33 as a rotation fulcrum. When the operation shaft 11 is swung in the diameter direction of the through-hole 2 until it comes into contact with the inner surface 1b of the through-hole 2 of the water pipe 1 (a three-dimensional rotation operation which is an example of a moving operation), the retaining member Only one end portion in the longitudinal direction of 12 is in a single-contact state that engages with the opening peripheral edge of the through hole 2 in the arc-shaped inner surface 1 a of the water pipe 1. In this one-sided state, the other end portion in the longitudinal direction of the retaining member 12 is located in the through hole 2, so that it engages with the opening peripheral edge of the through hole 2 as the operation shaft 11 is pulled upward. When an external force in the swing direction is applied to one end portion of the retaining member 12 that is in contact, the other end portion of the retaining member 12 swings in a state of being advanced into the through hole 2.

Further, the holding member 33 has a spherical body 30 that is rotatably supported by the lower spherical receiving surface 31 of the replacement work case 7 and the upper spherical receiving surface 32 of the holding member 33 as a rotation fulcrum portion. An operation restricting tool 35 that can be switched between a state in which the swing operation of the operation shaft 11 is allowed and a state in which the swing operation is prohibited (blocked) is provided.
The operation restricting tool 35 is composed of a plurality of fixing bolts 35A that come into contact with a plurality of circumferential portions of the upper shaft portion protruding upward from the spherical body 30 in the outer shaft 11A along the axial diameter direction from the horizontal direction. ing.
Then, by the screwing operation of the fixing bolt 35A to the holding member 33, the swing operation prohibited state in which the tips of the plurality of fixing bolts 35A are in contact with the upper shaft portion of the outer shaft 11A and the tips of the plurality of fixing bolts 35A are It is possible to switch to a swing operation permissible state separated from the upper shaft portion of the outer shaft 11A.

The posture holding portion F3 of the posture switching execution means F is a surface facing the inner peripheral surface side corner portion of the lower pressing member 21 that can be pushed up against the elastic restoring force of the blocking elastic body 22 and the outer peripheral surface of the middle shaft 11B. The longitudinal cross-sectional shape formed between them is constituted by an annular temporary holding space 37 having a substantially triangular shape.
Therefore, when the retaining member 12 swings from the engagement posture to the insertion / removal posture, the tip of the upper projection 12 c of the retaining member 12 blocks the lower surface 21 b of the pressing portion of the lower pressing member 21. The retaining member 12 in the temporary holding space 37 between the opposing surfaces of the inner peripheral surface side corners of the lower pressing member 21 and the outer peripheral surface of the central shaft 11B that pass while being pushed up against the elastic restoring force of the lower shaft 21 and returned after the passage. The protrusion 12c on the upper side is temporarily fixed.

  In addition, the retaining member 12 in the insertion / extraction posture is fed into the pipe from the through hole 2 of the water pipe 1, and the inclined side surface 12 a on the lower side of the retaining member 12 temporarily held in the temporary holding space 37 is the water pipe 1. When the external force higher than the temporary holding force is applied to the inclined side surface 12a on the lower side of the retaining member 12 in contact with the arc-shaped inner surface 1a of the retaining member 12, the insertion / extraction posture temporarily retained in the temporary retaining space 37 is maintained. The retaining member 12 swings to the detachment side, and the upper protrusion 12c passes while pushing up the inner peripheral surface side corner of the lower pressing member 21 against the elastic restoring force of the blocking elastic body 22, The retaining member 12 is switched to the horizontal engagement posture.

Next, a through hole blocking work method for the water pipe 1 using the fluid pipe blocking device A configured as described above will be described.
This through hole blocking work method includes a blocking work process and a blocking release work process.
The main configuration of the shut-off operation process is that the operation shaft 11 of the shut-off device A for fluid pipes is put through the fluid equipment C attached to the water pipe 1 in communication with the through hole 2 of the pipe wall 1A of the water pipe 1 in a penetrating state. Removably mounted, the retaining member 12 of the retaining means E provided at the tip of the operating shaft 11 passes through the through hole 2 of the water pipe 1 from the communicating inflow portion 8 in the fluid equipment C in an insertion / extraction posture. Is inserted into the water pipe 1 and is switched to an engaging posture in which the retaining member 12 is engaged with the opening periphery of the through-hole 2 in the water pipe 1, and a blocking means provided on the distal end side of the operation shaft 11. The through hole 2 is blocked by D.
The main configuration of the shut-off release work process is to release the shut-off means D that shuts off the through-hole 2 of the water pipe 1 and to change the through-hole 2 in a state where the retaining member 12 of the retaining means E is switched to the insertion / extraction posture. It passes through and is drawn out to the communication inflow portion 8 in the fluid equipment C.

Hereinafter, the blocking work process and the break releasing work process of the above-described through hole blocking work method will be described in detail in a plurality of stages.
[1] First Stage of Blocking Operation Process FIG. 1 is described in the above-described fluid pipe blocking device A, but the removal work and the leaving of the cap 4 and the detachment prevention presser cover 5 of the through-hole closing device B to be replaced are left. A housing that covers the replacement work area including the whole of the through-hole closing device B to be replaced before construction, in a watertight state, with the fixed connection work of the valve box 6b of the work on-off valve 6 to the split T-shaped pipe 3 being a part ( (Not shown) in a state of being executed in an indefinite water state. Furthermore, the state which the fixed connection operation | work of the replacement | exchange work case 7 of the interruption | blocking apparatus A for fluid pipes was performed with respect to the on-off valve 6 for work in the valve closing state after a housing was removed is shown.
In the state shown in FIG. 1, since the engagement convex portion 14a on the distal end side of one operation handle 14 is engaged with the upper engagement concave portion 16 of the middle shaft 11B, the operation shaft core between the outer shaft 11A and the middle shaft 11B. The relative movement in the Y direction and the relative rotation around the operation axis Y are prevented, and the outer shaft 11A and the middle shaft 11B move together.

  As shown in FIGS. 1 and 2, the distal ends of the plurality of fixing bolts 35 </ b> A of the operation restricting tool 35 are allowed to push and pull the operation shaft 11 in the vertical direction of the upper shaft portion of the outer shaft 11 </ b> A. The swing operation is in a state of being in contact with the outer peripheral surface. The operation shaft 11 in the swing operation prohibited state has a shaft support of the posture switching execution means F provided in the replacement work case 7 in a vertical posture in which the operation axis Y is positioned on a vertical line passing through the center of the through hole 2. It is held in the part F2.

A boss portion 12A formed at the central portion in the longitudinal direction of the retaining member 12 of the retaining means E is pivotally attached to the lower end portion of the center shaft 11B so as to be swingable in the vertical direction around a pivot pin 18 that is horizontal. The boss portion 12A of the retaining member 12 and the pivot pin 18 constitute a swing pivot attachment structure F1 of the posture switching execution means F.
Further, in the state shown in FIG. 1, the retaining member 12 of the retaining means E is swung to the insertion / removal posture, and the tip of the upper protruding portion 12 c of the retaining member 12 is pressed by the lower pressing member 21. Between the opposing surface of the inner peripheral surface side corner of the lower pressing member 21 and the outer peripheral surface of the central shaft 11B that pass through the lower surface 21b of the lower portion 21b while pushing up against the elastic restoring force of the blocking elastic body 22 In the temporary holding space 37 of the posture holding portion F3 of the posture switching execution means F formed in the above, the protrusion 12c on the upper side of the retaining member 12 in the insertion / extraction posture is temporarily held.
Further, the retaining member 12 of the retaining means E is set in a tube axis orientation such that the longitudinal direction thereof is the tube axis X direction.

[2] Second Stage of Blocking Operation Step Next, in the state shown in FIG. 1, the shaft insertion operation treatment provided between the two operation handles 14, 15 of the operation shaft 11 and the valve box 6 b of the work opening / closing valve 6. By operating a tool (for example, a lever block (registered trademark)) 39, the retaining means E and the blocking means D provided at the lower end side portion of the operation shaft 11 are It feeds into the pipe from the connection hole 3e and the through hole 2 of the water pipe 1.
At this time, since the retaining member 12 of the retaining means E is temporarily held in the insertion / removal posture by the temporary holding space 37 of the posture holding portion F3, the inner surface of the connection hole 3e of the split T-shaped tube 3 and the penetration of the water pipe 1 It is smoothly fed into the pipe without contacting the inner surface 1b of the hole 2.

  As shown in FIG. 4, the retaining member 12 in the insertion / extraction posture sent into the tube has an arcuate inner surface 1 a on the tube bottom side in which the inclined side surface 12 a on the lower side thereof faces the through hole 2 in the operation axis Y direction. Since an external force for upward swinging greater than the temporary holding force acts on the inclined side surface 12a on the lower side of the retaining member 12, the upper side temporarily held in the temporary holding space 37 of the posture holding portion F3. The retaining member 12 swings to the side from which the protruding portion 12c comes out (detachment side), and the upper protruding portion 12c uses the elastic member 22 for blocking the inner peripheral surface side corner of the lower pressing member 21 as an elastic restoring force. And the retaining member 12 has its lower surface 12d abutted against the arc-shaped inner surface 1a on the tube bottom side in a tube axis direction along the tube axis X direction. Switch to posture.

[3] Third Stage of Shut-off Operation Process As shown in FIG. 5, one operating handle 14 is screwed to the loose side, and the engaging convex portion 14a of one operating handle 14 is engaged with the upper side of the middle shaft 11B. Extract from the recess 16. In this state, the operation handles 14 and 15 are pushed in, and the outer shaft 11A is moved downward with respect to the middle shaft 11B in contact with the arcuate inner surface 1a on the tube bottom side. By this movement, the lower engagement concave portion 17 of the middle shaft 11B and the insertion hole 11a of the outer shaft 11A are matched, and the engagement convex portion 14a of one operation handle 14 is engaged with the lower engagement concave portion 17 of the middle shaft 11B. .
In this engaged state, the cutoff elastic body 22 of the cutoff means D is located between the opposing surfaces in the operation axis Y direction between the engagement convex portion 14a of one operation handle 14 and the lower engagement concave portion 17 of the middle shaft 11B. From the shut-off state of the outer diameter smaller than the diameter of the through-hole 2 of the water pipe 1 to the shut-off state in which the diameter is increased from the shut-off state to the outer diameter larger than the diameter of the through-hole 2, or from the shut-off state to the shut-off state An interchange S1 that secures an operation stroke for switching operation is formed.

[4] Fourth Stage of Blocking Operation Process As shown in FIG. 6, the operation shaft 11 is pulled upward to operate both the retaining members 12 on the peripheral edge of the through hole 2 in the arc-shaped inner surface 1 a of the water pipe 1. The protrusion 12c is engaged.
In this state, the blocking elastic member 22 disposed between the pressing surfaces of the pressing members 20 and 21 of the blocking means D enters the through-hole 2 of the water pipe 1 and blocks the upper surface 12 b of the retaining member 12. The lower surface 21b of the pressing portion of the lower pressing member 21 of the means D is in contact.
Therefore, in the next step, when the expansion nut 23 of the blocking means D is operated to the tightening side, the lower pressing member 21 does not move but only the upper pressing member 20 provided on the outer shaft 11A moves downward. .

[5] Fifth Stage of Shut-off Work Process As shown in FIG. 7, when the expansion nut 23 of the shut-off means D is screwed to the tightening side, the outer shaft 11A is pushed downward with respect to the middle shaft 11B and moved downward. The elastic body 22 for interruption | blocking in the interruption | blocking cancellation | release state is larger than the diameter of the through-hole 2 of the water pipe 1 by the pinching effect | action accompanying the proximity | contact movement of the pressing surface of the upper side pressing member 20 with respect to the pressing surface of the side pressing member 21 The through hole 2 of the water pipe 1 is blocked in a watertight state by elastically deforming into a blocking state expanded to a diameter.

[6] Sixth stage of the shut-off work process (removal work of remaining parts)
As shown in FIG. 8, the split T-shaped pipe 3, the work on / off valve 6, and the replacement work case 7, which are the remaining parts of the replacement target through-hole closing device B constituting the fluid equipment C, are removed from the water pipe 1. .
Even in this removed state, both projecting portions 12c of the retaining member 12 are engaged with the opening peripheral edge of the through hole 2 in the arc-shaped inner surface 1a of the water pipe 1, so that the blocking elastic of the blocking means D in the blocking state is provided. The body 22 is securely and securely retained at the blocking position corresponding to the through hole 2 of the water pipe 1 against water pressure.

[7] First Stage of Shut-off Release Work Process Next, a description will be given with reference to FIG. 7 and FIG. 9. The shut-off elastic body 22 of the shut-off means D is diameter-expanded to the shut-off state and penetrates the water pipe 1. In a state where the hole 2 is shut off in a watertight state, the water pipe 1 is connected to the split T-shaped pipe 3 which is a part of the new through-hole closing device B, the work on / off valve 6 of the fluid pipe shut-off device A and the replacement work case. 7 is installed in a watertight state.
The distal ends of the plurality of fixing bolts 35A of the operation restricting tool 35 abut on the outer peripheral surface of the upper shaft portion of the outer shaft 11A in a state in which the vertical push-pull operation of the operation shaft 11 is allowed. The swinging operation of the shaft 11 is prohibited. The operation shaft 11 in the swing operation prohibited state has a shaft support of the posture switching execution means F provided in the replacement work case 7 in a vertical posture in which the operation axis Y is positioned on a vertical line passing through the center of the through hole 2. It is held in the part F2.

When the assembly of the fluid equipment C including the split T-shaped tube 3 which is a part of the new through-hole closing device B is completed, the expansion nut 23 of the blocking means D is screwed to the loose side. As a result of this screwing operation, the outer shaft 11A is moved upward with respect to the middle shaft 11B, and the diameter of the outer shaft 11A is increased by releasing the pinching accompanying the separation of the pressing surface of the upper pressing member 20 with respect to the pressing surface of the lower pressing member 21. The blocking elastic body 22 in the state is elastically deformed into a blocking release state reduced in diameter by an elastic restoring force.
Thereafter, the expansion nut 23 of the blocking means D is screwed to the slack side, and one operation handle 14 is screwed to the slack side, so that the engaging convex portion 14a of the one operation handle 14 is below the middle shaft 11B. Pull out from the side engagement recess 17. In this state, the operating handles 14 and 15 are pulled up so that the upper engaging concave portion 16 of the middle shaft 11B and the insertion hole 11a of the outer shaft 11A are aligned, and the engaging convex portion 14a of one operating handle 14 is moved to the middle shaft 11B. The upper engaging recess 16 is engaged.

Furthermore, as shown in FIG. 9, the plurality of fixing bolts 35 </ b> A are screwed into the slack side with respect to the holding member 33, and the tip of each fixing bolt 35 </ b> A is swung away from the outer peripheral surface of the upper shaft portion of the outer shaft 11 </ b> A. Switch to the permissible operation state.
In this swinging operation permissible state, the spherical body 30 that is rotatably supported by the lower spherical receiving surface 31 of the replacement work case 7 and the upper spherical receiving surface 32 of the pressing member 33 is used as a rotation fulcrum portion. The operation shaft 11 is swung in the diameter direction of the through hole 2 (moving operation) until the lower end portion of 11B is in contact with or close to the inner surface 1b of the through hole 2 of the water pipe 1. Thereby, only the one end part of the retaining member 12 will be in the state engaged with the opening periphery of the through-hole 2 in the circular-arc-shaped inner surface 1a of the water pipe 1. FIG. In this state, the other end in the longitudinal direction of the retaining member 12 is located in the through hole 2 in plan view.

[8] Second Stage of the Breaking Release Work Process As shown in FIG. 10, only one end of the retaining member 12 is engaged with the opening peripheral edge of the through hole 2 in the arcuate inner surface 1 a of the water pipe 1. By pulling the operating shaft 11 upward, an external force that swings downward is applied to one end of the retaining member 12, and the other end of the retaining member 12 is advanced into the through hole 2 in advance. Swing with.
At this time, the tip of the upper protruding portion 12c of the retaining member 12 passes through the lower surface 21b of the pressing portion of the lower pressing member 21 while pushing up against the elastic restoring force of the blocking elastic body 22, and returns after passing. The protrusion 12c on the upper side of the retaining member 12 is temporarily fixed and held in the temporary holding space 37 between the opposed surfaces of the inner pressing surface 21 and the outer peripheral surface of the middle shaft 11B.
Therefore, when the retaining member 12 is switched to the insertion / extraction posture by the upward pulling operation of the operation shaft 11, the retaining member 12 reaching the insertion / extraction posture is prevented from returning to the engaging posture and swinging. It is possible to pass through the through-hole 2 of the water pipe 1 and the connection hole 3e of the connection pipe portion 3C reliably and smoothly in a state where the retaining member 12 is held in the insertion / extraction posture.

[9] Third Stage of Blocking Release Work Process FIG. 11 shows a new through-hole closing device B after completion of construction.
As a work process until the completion of the construction, when the retaining means E and the shut-off means D are pulled out into the replacement work case 7 by the drawing operation of the operation shaft 11 in FIG. 6a is closed, and the replacement work case 7 is removed from the work on-off valve 6.
Next, the operation opening / closing valve 6 can accommodate the cap 4 which is a part of the new through-hole closing device B, and another operation shaft to which the cap 4 is attached is provided for the lifting operation and the rotation operation. Install another replacement work case. Thereafter, the valve body 6a of the work opening / closing valve 6 is opened, and another operation shaft of another replacement work case is operated to lower the cap 4 in the replacement work case and then rotate it. The cap 4 is screwed and connected to the connecting tube portion 3C of the split T-shaped tube 3 in a watertight state.
Further, after removing the working on-off valve 6 and another replacement work case from the connecting pipe portion 3C of the split T-shaped tube 3, the cap 4 is attached to the connecting tube portion 3C of the split T-shaped tube 3 with the cap 4 being split. The presser cover 5 for preventing separation is fixedly connected to the connecting pipe portion 3C.

In the first embodiment described above, the split T-shaped tube 3 of the through-hole blocking device B is configured in a two-divided structure, but a split T-shaped tube 3 having a three-divided structure may be used.
In the first embodiment described above, the inner peripheral surface side corner portion of the lower pressing member 21 that can push up the posture holding portion F3 of the posture switching execution means F against the elastic restoring force of the blocking elastic body 22. Although the longitudinal cross-sectional shape formed between the opposing surfaces of the inner shaft 11B and the outer peripheral surface of the middle shaft 11B is configured from the annular temporary holding space 37 having a substantially triangular shape, the configuration is not limited thereto. For example, in the swing pivot attachment structure F1 of the posture switching execution means F constituted by the boss portion 12A of the retaining member 12 and the pivot pin 18, it is between the boss portion 12A of the retaining member 12 and the pivot pin 18. The posture holding portion F3 may be configured with a friction pivot structure that can hold the retaining member 12 in an arbitrary posture around the pivot pin 18 by increasing the frictional force in the case.
Further, the fluid pipe shutoff device A and the through hole shutoff work method of the first embodiment described above are fluids in which a branch pipe provided with a gate valve is connected to the connection opening of the connection pipe portion 3C of the split T-shaped pipe 3. In the facility, it can be suitably used also when the through-hole 2 that is the connection opening of the connection pipe portion 3C is temporarily blocked in a retaining state.

[Second Embodiment]
12 to 20 show a fluid pipe blocking device A obtained by modifying a part of the posture switching execution means F of the first embodiment and a through hole blocking work method using the same.
The posture switching execution means F used in the second embodiment includes a pair (a plurality) of pivot members pivotally attached to the distal end portion of the operation shaft 11 by the constituent members of the retaining member 12 of the retaining means E. Detachable bodies 12B and 12C and a shaft rotation support portion F5 for rotatably supporting the operation shaft 11 around the operation axis Y with respect to the replacement work case 7 constituting a part of the fluid equipment C are provided. ing.
The pair of retaining bodies 12B and 12C can be switched to freely swing between an engagement posture along the axial direction of the operation shaft 11 and an insertion / removal posture narrowed and swung upward on the base end side of the operation shaft 11. It is configured.
Further, by rotating the operation shaft 11 around the operation axis Y in the shaft rotation support portion F5, both the retaining members 12B and 12C are arranged in the direction of the tube axis along the tube axis X direction of the water pipe 1 and the water supply. It is configured to be freely changeable to a pipe radial orientation along the diameter direction of the pipe 1.
Further, the posture switching execution means F holds the retaining members 12B and 12C in the engaged posture, and withdraws due to contact with the arcuate inner surface 1a of the water pipe 1 and the inner surface 1b of the through hole 2. There is provided an urging holding portion F4 that allows the stoppers 12B and 12C to swing to the insertion / extraction posture.

A boss portion 12e formed at one end portion in the longitudinal direction of both retaining members 12B and 12C is pivotally attached to a lower end portion of the middle shaft 11B of the operation shaft 11 by a horizontal support pin 40 so as to be swingable up and down. With the boss portions 12e of the both retaining bodies 12B and 12C and the pivot pin 40, the both retaining bodies 12B and 12C are switched between the insertion / extraction posture and the engagement posture with respect to the lower end portion which is the tip portion of the operation shaft 11. An oscillating pivoting structure that pivots freely is configured.
In addition, a protruding portion 12f protruding upward is integrally formed at the other end portion in the longitudinal direction of both the retaining members 12B and 12C.
When both retaining bodies 12B, 12C are in the engaged posture, the total length between the maximum outer surfaces of both protrusions 12f of both retaining bodies 12B, 12C is a through hole formed in the pipe wall 1A of the water pipe 1 When the two retaining members 12B, 12C formed in a length larger than the diameter of 2 and the inner diameter of the water pipe 1 and in the engaging posture are in a posture toward the tube axis along the tube axis X, the water pipe 1 The arc-shaped inner surface 1a of the through hole 2 is configured to be stably engageable with the opening peripheral edge.
In addition, when both the retaining bodies 12B and 12C are in an insertion / extraction posture in which the retaining bodies 12B and 12C are swung upward, the maximum width between the outer surfaces of both the retaining bodies 12B and 12C is smaller than the diameter of the through hole 2 of the water pipe 1. It can be changed to dimensions.

When the retaining members 12B and 12C in the insertion / extraction posture are expanded and swung to a state where they are continuous in a substantially straight line in the horizontal direction, they are brought into contact with each other from the swinging direction and further below the biasing holding portion F4. The stopper part 41 which prevents the rocking | fluctuation to is provided by providing in the one end part of the longitudinal direction of both the retaining members 12B and 12C.
A state in which the stoppers 41 are in contact with each other and the retaining members 12B and 12C are continuous in a substantially straight line in the horizontal direction is an engaging posture, and the urging of the retaining members 12B and 12C to the engaging posture is performed. The holding is held by gravity urging using the dead weights of both the retaining members 12B and 12C.

Therefore, in the communication inflow part 8 in the fluid equipment C constituted by the internal space (branch flow path) of the connecting pipe part 3C of the split T-shaped pipe 3, both the retaining bodies 12B constituting the retaining member 12; 12C is held in the engaged posture by gravity bias. However, as the operating shaft 11 is pushed in, both retaining members 12B and 12C are placed on the opening peripheral edge of the connection hole 3e on the inner surface of the connection pipe portion 3C of the split T-shaped tube 3 and the inner surface 1b of the through hole 2 of the water pipe 1. When they come into contact, both retaining members 12B and 12C squeeze and swing upward against the gravity force, and the retaining members 12B and 12C are switched to the insertion / removal posture. While being done, it passes through the connection hole 3e of the split T-shaped pipe 3 and the through hole 2 of the water pipe 1 reliably and smoothly.
Further, since the retaining members 12B and 12C swing back to the engaged posture by the gravitational biasing force by the biasing holding portion F4 when passing through the through hole 2, a special operation for switching to the engaging posture is performed. It becomes unnecessary.

The shaft rotation support part F5 can move and operate the operation shaft 11 in the direction of the operation axis Y passing through the center of the through hole 2 with respect to the ceiling case part 7a of the replacement work case 7 and around the operation axis Y And is configured to be supported by penetrating in a watertight state so as to be freely rotatable.
Therefore, both the retaining members 12B and 12C in the engagement posture in the pipe are moved from the posture toward the tube axis along the tube axis X by the rotation operation of the operation shaft 11 penetratingly supported by the shaft rotation support portion F5. When the posture is changed to the pipe radial orientation along the diameter direction 1, both the retaining members 12B and 12C come into contact with the arcuate inner surface 1a continuous with the inner surface 1b of the through-hole 2 of the water pipe 1, and are swung upward. To do. By pulling up the operating shaft 11 in this state, both the retaining members 12B and 12C are squeezed to the insertion / extraction posture by the contact with the arcuate inner surface 1a of the water pipe 1 and the inner surface 1b of the through hole 2. The through hole 2 can be reliably and smoothly passed by being moved.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

Next, a through hole blocking work method for the water pipe 1 using the fluid pipe blocking device A according to the second embodiment configured as described above will be described.
[1] First Stage of Blocking Operation Process FIG. 12 shows the removal work of the cap 4 and the detachment prevention presser cover 5 of the replacement target through-hole closing device B and the remaining parts, as in FIG. 1 of the first embodiment. The housing for covering the replacement work area including the whole of the through-hole closing device B to be replaced before construction in a watertight state with the fixed connection work of the valve box 6b of the work on-off valve 6 to the split T-shaped tube 3 (Fig. (Not shown) is in a state where it has been executed in an indefinite water state. Furthermore, the state which the fixed connection operation | work of the replacement | exchange work case 7 of the interruption | blocking apparatus A for fluid pipes was performed with respect to the on-off valve 6 for work in the valve closing state after a housing was removed is shown.
In the state shown in FIG. 12, since the engagement convex portion 14a of one operation handle 14 is engaged with the upper engagement concave portion 16 of the middle shaft 11B, the operation shaft core Y direction between the outer shaft 11A and the middle shaft 11B. The relative movement and the relative rotation around the operation axis Y are prevented, and the outer shaft 11A and the middle shaft 11B move together.
Further, both retaining members 12B and 12C constituting the retaining member 12 are urged and held in the engagement posture by gravity urging utilizing their own weight in the internal space of the fluid equipment C.
Further, the two retaining members 12B, 12C constituting the retaining member 12 are set in a tube axis orientation such that the longitudinal direction thereof is the tube axis X direction.

[2] Second Stage of Blocking Operation Step Next, as shown in FIG. 13, a shaft insertion operation treatment provided between the two operation handles 14 and 15 of the operation shaft 11 and the valve box 6b of the work on / off valve 6 is performed. By operating a tool (for example, a lever block) 39, the retaining means E and the blocking means D provided at the lower end portion of the operating shaft 11 are resisted against water pressure and the connection hole 3e of the split T-shaped tube 3 and the water supply The tube 1 is fed into the tube through the through hole 2.
At this time, when both the retaining members 12B and 12C in the engagement posture come into contact with the opening peripheral edge of the connection hole 3e on the inner surface of the connection tube portion 3C of the split T-shaped tube 3 and the inner surface 1b of the through hole 2 of the water pipe 1. Both the retaining members 12B and 12C are swung to the upper side, which is the base end side of the operation shaft 11, against the gravity urging force with the pivot pin 40 as a swing fulcrum. Therefore, both the retaining bodies 12B and 12C are surely and smoothly passed through the connection hole 3e of the split T-shaped pipe 3 and the through hole 2 of the water pipe 1 while being switched to the insertion / extraction posture.
Furthermore, as shown in FIG. 14, the two retaining members 12B and 12C passing through the through hole 2 of the water pipe 1 are separated by gravity by the biasing holding portion F4 when the contact with the inner surface 1b of the through hole 2 is released. By urging, it smoothly swings back to the engaged position. Therefore, a special operation for switching the both retaining members 12B and 12C that have passed through the through hole 2 to the engagement posture is not necessary.

[3] Third Stage of Blocking Operation Process As shown in FIG. 15, one operating handle 14 is screwed to the loose side, and the engaging convex portion 14a of one operating handle 14 is engaged with the upper side of the middle shaft 11B. Extract from the recess 16. In this state, the expansion nut 23 of the blocking means D is screwed to the tightening side, and the outer shaft 11A is pushed and moved to the lower end side with respect to the middle shaft 11B. By this movement, the lower engagement concave portion 17 of the middle shaft 11B and the insertion hole 11a of the outer shaft 11A are matched, and the engagement convex portion 14a of one operation handle 14 is engaged with the lower engagement concave portion 17 of the middle shaft 11B. .
In this engaged state, the cutoff elastic body 22 of the cutoff means D is located between the opposing surfaces in the operation axis Y direction between the engagement convex portion 14a of one operation handle 14 and the lower engagement concave portion 17 of the middle shaft 11B. From the shut-off state of the outer diameter smaller than the diameter of the through-hole 2 of the water pipe 1 to the shut-off state in which the diameter is increased from the shut-off state to the outer diameter larger than the diameter of the through-hole 2, or from the shut-off state to the shut-off state An interchange S1 that secures an operation stroke for switching operation is formed.

[4] Fourth Stage of Shut-off Operation Process As shown in FIG. 16, the operation shaft 11 is pulled upward, and both retaining members 12B are disposed on the opening peripheral edge of the through hole 2 in the arc-shaped inner surface 1a of the water pipe 1. The protrusion 12f of 12C is engaged. At this time, both the retaining members 12B and 12C are engaged along the top of the arcuate inner surface 1a of the water pipe 1 in a posture toward the tube axis along the tube axis X direction.
Further, in a state in which the protrusions 12 f of the retaining member 12 are engaged with the opening periphery of the through hole 2, both pressing members 20, 21 of the blocking means D are inserted into the through hole 2 of the pipe wall 1 A of the water pipe 1. The blocking elastic body 22 disposed between the pressing surfaces of the blocking member 12B and the lower pressing member 21 of the lower pressing member 21 of the blocking means D is in contact with the upper surfaces 12g of the retaining members 12B and 12C.
Therefore, in the next step, when the expansion nut 23 of the blocking means D is operated to the tightening side, the lower pressing member 21 does not move but only the upper pressing member 20 provided on the outer shaft 11A moves downward.

[5] Fifth Stage of Shut-off Work Process As shown in FIG. 17, when the expansion nut 23 of the shut-off means D is screwed to the tightening side, the outer shaft 11A is pushed and moved to the lower end side with respect to the middle shaft 11B. Due to the clamping action accompanying the proximity movement of the pressing surface of the upper pressing member 20 with respect to the pressing surface of the side pressing member 21, the blocking elastic body 22 in the blocking release state having an outer diameter smaller than the diameter of the through hole 2 is provided as a water pipe. It is elastically deformed into a shut-off state in which the diameter has been expanded to an outer diameter larger than the diameter of one through-hole 2, and the through-hole 2 of the water pipe 1 is shut off in a watertight state.

[6] Sixth stage of the shut-off work process (removal work of remaining parts)
As shown in FIG. 18, the split T-shaped pipe 3, the work on / off valve 6, and the replacement work case 7, which are the remaining parts of the replacement target through-hole closing device B constituting the fluid equipment C, are removed from the water pipe 1. .
Even in this removed state, both protrusions 12f of the retaining member 12 are engaged with the opening peripheral edge of the through hole 2 in the arc-shaped inner surface 1a of the water pipe 1, so that the blocking elastic of the blocking means D in the blocking state is provided. The body 22 is securely and securely retained at the blocking position corresponding to the through hole 2 of the water pipe 1 against water pressure.

[7] First Stage of Shut-off Release Work Process Next, a description will be given with reference to FIGS. 17 and 19. The shut-off elastic body 22 of the shut-off means D is diameter-expanded to the shut-off state and penetrates the water pipe 1. In the state where the hole 2 is shut off in a watertight state, the water pipe 1 is connected to the split T-shaped pipe 3 which is a part of the new through-hole closing device B, the work on / off valve 6 of the fluid pipe shut-off device A and the replacement work case. 7 is installed in a watertight state.
When the assembly of the fluid equipment C including the split T-shaped tube 3 which is a part of the new through-hole closing device B is completed, the expansion nut 23 of the blocking means D is screwed to the loose side. As a result of this screwing operation, the outer shaft 11A is moved upward with respect to the middle shaft 11B, and the diameter of the outer shaft 11A is increased by releasing the pinching accompanying the separation of the pressing surface of the upper pressing member 20 with respect to the pressing surface of the lower pressing member 21. The blocking elastic body 22 in the state is elastically deformed into a blocking release state reduced in diameter by an elastic restoring force.
Thereafter, the expansion nut 23 of the blocking means D is screwed to the slack side, and one operation handle 14 is screwed to the slack side, so that the engaging convex portion 14a of the one operation handle 14 is below the middle shaft 11B. Pull out from the side engagement recess 17. In this state, the operating handles 14 and 15 are pulled up so that the upper engaging concave portion 16 of the middle shaft 11B and the insertion hole 11a of the outer shaft 11A are aligned, and the engaging convex portion 14a of one operating handle 14 is moved to the middle shaft 11B. The upper engaging recess 16 is engaged.

Next, as shown in FIG. 19, when the operation shaft 11 that is penetrated and supported by the shaft rotation support portion F <b> 5 is rotated, both the retaining members 12 </ b> B and 12 </ b> C that are in the engagement posture in the tube are along the tube axis X. The pipe axis orientation is changed to the pipe diameter orientation along the diameter direction of the water pipe 1. At this time, since the total length between the maximum outer surfaces of both protrusions 12f of both retaining members 12B and 12C is formed to be larger than the inner diameter of the water pipe 1 and the diameter of the through hole 2, both The distal ends of the retaining bodies 12B and 12C abut against the arcuate arc-shaped inner surface 1a continuous with the inner surface 1b of the through hole 2 of the water pipe 1, and both the retaining bodies 12B and 12C swing the pivot pin 40. It is swung upward as a fulcrum and swung.
In this state, when the operation shaft 11 is pulled out upward, as shown in FIG. 20, both retaining members 12B and 12C are brought into contact with the arcuate inner surface 1a of the water pipe 1 and the inner surface 1b of the through hole 2. With the pivot pin 40 as a swing fulcrum, it is swung further upward and swung to the insertion / removal posture, and both the retaining members 12B and 12C are surely and smoothly moved through the through hole 2. It will be.

[8] Second Stage of Shut-off Release Work Process The retaining means E and the shut-off means D are pulled out and moved into the replacement work case 7 by the pull-out operation of the operating shaft 11 in FIG. Thereafter, the valve body 6 a of the work on-off valve 6 is closed, and the replacement work case 7 is removed from the work on-off valve 6.
Next, the operation opening / closing valve 6 can accommodate the cap 4 which is a part of the new through-hole closing device B, and another operation shaft to which the cap 4 is attached is provided for the lifting operation and the rotation operation. Install another replacement work case. Thereafter, the valve body 6a of the work opening / closing valve 6 is opened, and another operation shaft of another replacement work case is operated to lower the cap 4 in the replacement work case and then rotate it. The cap 4 is screwed and connected to the connecting tube portion 3C of the split T-shaped tube 3 in a watertight state.
Further, after removing the working on-off valve 6 and another replacement work case from the connecting pipe portion 3C of the split T-shaped tube 3, the cap 4 is attached to the connecting tube portion 3C of the split T-shaped tube 3 with the cap 4 being split. The detachment prevention presser cover 5 that is pressed and fixed to the connecting pipe portion 3C is fixedly connected (see FIG. 11).

  In the second embodiment described above, the two retaining members 12B and 12C are energized by gravity urging using the weights of the retaining members 12B and 12C. The stoppers 12B and 12Cl may be biased to the engagement posture by the elastic biasing force of the spring material.

[Third Embodiment]
FIGS. 21 to 30 show a fluid pipe blocking device A in which a part of the posture switching execution means F of the first embodiment is modified, and a through hole blocking work method using the same.
The posture switching execution means F used in the third embodiment is a constituent member of the retaining member 12 of the retaining means E, and can be switched between the engagement posture and the insertion / removal posture at the distal end portion of the operation shaft 11. A pair of retaining bodies 12D, 12E that are provided and are retreated in contact with the arcuate inner surface 1a of the water pipe 1 and the inner surface 1b of the through-hole 2, and the both retaining bodies 12D. , 12E, and a movable pressing portion F6 that can be released to project into an engagement posture, and the operation shaft 11 is rotatably supported around the operation axis Y with respect to the fluid equipment C, thereby preventing both ends A shaft rotation support portion F7 is provided that enables the bodies 12D and 12E to be changed to a tube axis orientation along the tube axis X direction of the water pipe 1 and a tube radial orientation along the diameter direction of the water pipe 1. ing.

  The lower pressing member 21 of the blocking means D has an outer peripheral surface 50a that is the same diameter as the outer peripheral surface of the pressing portion of the lower pressing member 21 and is flush with the outer peripheral surface 50a. The retaining holder 50 having a tapered inner peripheral surface 50b that is continuously expanded to the outer peripheral surface 50a is integrally formed. At two places in the circumferential direction of the retaining holder 50, there are mounting holes 50 c that penetrate through the outer peripheral surface 50 a and the inner peripheral surface 50 b in an inclined posture that is located upward on the outer side in the radial direction of the operation shaft 11. The retaining bodies 12D and 12E are formed in both mounting holes 50c so as to be movable in and out along the axial diameter direction.

The base end portion on the inner side in the axial radial direction of each retaining member 12D, 12E inserted into each mounting hole 50c of the retaining member 50 is formed on the tapered inner peripheral surface 50b of the retaining member 50. The retaining protrusions 12h that come into contact with each other are integrally formed, and the contours of the retaining members 12D and 12E are substantially T-shaped.
Further, in the state where the retaining protrusions 12h of the retaining members 12D and 12E are in contact with the tapered inner peripheral surface 50b of the retaining member 50, the axially outward sides of the retaining members 12D and 12E. The leading end portion protrudes outward from the outer peripheral surface 50a of the retaining holder 50, and the projecting tip portions of the retaining bodies 12D and 12E are located on the opening peripheral edge of the through hole 2 in the arc-shaped inner surface 1a of the water pipe 1. Engage. This protruding posture is the engaging posture of the retaining members 12D and 12E.
Furthermore, the tip of each retaining member 12D, 12E is in a state of being slightly flush with the outer peripheral surface 50a of the retaining member 50 or slightly protruding from the outer peripheral surface 50a, or inwardly in the axial radial direction from the outer peripheral surface 50a. The retreated posture is an insertion / extraction posture capable of passing through the through hole 2 of the water pipe 1.
In the third embodiment, when each retaining member 12D, 12E is in the insertion / removal posture, the tip of each retaining member 12D, 12E is in a state of slightly protruding from the outer peripheral surface 50a of the retaining member 50. is there.

The movable pressing portion F6 has a tapered pressing surface having the same or substantially the same gradient facing the tapered inner peripheral surface 50b of the retaining holding portion 50 from the operation shaft core Y direction at the lower end portion of the middle shaft 11B of the operating shaft 11. The pressing portion 51 having 51a is integrally formed.
Further, at the lower part of the pressing portion 51, when both the retaining members 12D and 12E are switched to the pipe radial orientation along the diametrical direction, they contact or approach the pipe bottom side of the arcuate inner surface 1a of the water pipe 1. A possible tapered chamfer 51b is formed.

The shaft rotation support portion F7 can move and operate the operation shaft 11 in the direction of the operation axis Y passing through the center of the through hole 2 with respect to the ceiling case portion 7a of the replacement work case 7 and around the operation axis Y And is configured to be supported by penetrating in a watertight state so as to be freely rotatable.
Therefore, both the retaining members 12D and 12E in the engagement posture in the pipe are turned from the posture toward the tube axis along the tube axis X by the rotation operation of the operation shaft 11 penetratingly supported by the shaft rotation support portion F7. 1 is changed to a pipe radial orientation along the diametrical direction 1, the distal end portions of both retaining bodies 12D and 12E come into contact with the arcuate inner surface 1a continuous with the inner surface 1b of the through-hole 2 of the water pipe 1 so as to be within the axial radial direction. Retire to the side. By pulling up the operating shaft 11 in this state, both the retaining members 12D and 12E are retracted to the insertion / removal posture by contact with the arcuate inner surface 1a of the water pipe 1 and the inner surface 1b of the through hole 2. The through hole 2 of the water pipe 1 can be surely and smoothly passed.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

Next, a through hole blocking work method for the water pipe 1 using the fluid pipe blocking device A of the third embodiment configured as described above will be described.
[1] First Stage of Blocking Operation Process FIGS. 21 and 22 are similar to FIG. 1 of the first embodiment, and the removal operation of the cap 4 and the detachment prevention presser cover 5 of the through-hole closing device B to be replaced are shown. The housing that covers the replacement work area including the through-hole closing device B to be replaced before construction, in a watertight state, with the fixed connection work of the valve box 6b of the work on-off valve 6 to the split T-shaped tube 3 that is the remaining part ( (Not shown) in a state of being executed in an indefinite water state. Furthermore, the state which the fixed connection operation | work of the replacement | exchange work case 7 of the shut-off device A for fluid pipes was performed with respect to the valve box 6b of the work on-off valve 6 in the valve-closing state after the housing was removed is shown.
In the state shown in FIG. 21, since the engagement convex portion 14a of one operation handle 14 is engaged with the upper engagement concave portion 16 of the middle shaft 11B, the operation shaft core Y direction between the outer shaft 11A and the middle shaft 11B. The relative movement and the relative rotation around the operation axis Y are prevented, and the outer shaft 11A and the middle shaft 11B move together.

In addition, as shown in FIGS. 21 and 22, in a state where the engaging convex portion 14a of one operation handle 14 is engaged with the upper engaging concave portion 16 of the middle shaft 11B, the lower pressing member 21 of the outer shaft 11A side is arranged. The pressing surface 51a of the pressing portion 51 provided at the lower end portion of the middle shaft 11B is in a state of being spaced downward with respect to the inner peripheral surface 50b of the retaining holder 50 provided at the lower end portion. That is, the pressing surface 51a of the pressing portion 51 is in a non-pressing state that allows movement of the retaining bodies 12D and 12E inserted into the mounting holes 50c of the retaining holder 50 inward in the axial radial direction. The retaining protrusions 12h of the retaining members 12D and 12E are in an insertion / removal posture in which they contact or approach the outer peripheral surface of the middle shaft 11B.
In addition, the retaining bodies 12D and 12E of the retaining member 12 are set in a tube axis orientation such that the longitudinal direction thereof is the tube axis X direction.

[2] Second Stage of Shut-off Operation Process Next, as shown in FIGS. 21 and 23, a shaft provided between the two operation handles 14 and 15 of the operation shaft 11 and the valve box 6 b of the work on / off valve 6. By operating an insertion operation jig (for example, a lever block) 39, the connection means of the split T-shaped tube 3 against the water pressure against the retaining means E and the blocking means D provided at the lower end portion of the operation shaft 11 3e and the through-hole 2 of the water pipe 1 are fed into the pipe.
At this time, the retaining bodies 12D and 12E inserted and mounted in the mounting holes 50c of the retaining holder 50 have the retaining protrusions 12h on the inner side in the axial radial direction abutting against the outer peripheral surface of the middle shaft 11B. It is in an insertion / extraction posture that is close and has a tip portion on the outer side in the axial radial direction slightly protruding from the outer peripheral surface 50 a of the retaining holder 50.
Therefore, as shown in FIGS. 23 and 24, the distal ends of the retaining bodies 12D and 12E inserted and mounted in the mounting holes 50c of the retaining holder 50 are connected to the connecting tube portion 3C of the split T-shaped tube 3, respectively. It will pass reliably and smoothly without contacting the inner surface of the connection hole 3e and the inner surface 1b of the through hole 2 of the water pipe 1.
Further, even when the distal end portions of the retaining bodies 12D and 12E inserted and mounted in the mounting holes 50c of the retaining holder 50 protrude in the axial radial direction from the through hole 2, The distal end portions of the retaining bodies 12D and 12E that are in a protruding state as the operation shaft 11 is pushed in contact with the opening peripheral edge of the through hole 2 and the inner surface 1b of the through hole 2 on the outer surface 1c of the water pipe 1. Since it is smoothly retracted inward in the radial direction, the distal end portions of the retaining members 12D and 12E can be surely and smoothly passed without being caught by the opening periphery of the through hole 2.

[3] Third Stage of Shut-off Operation Process As shown in FIG. 25, one operation handle 14 is screwed to the loose side, and the engagement convex portion 14a of one operation handle 14 is engaged with the upper side of the middle shaft 11B. Extract from the recess 16. In this state, the expansion nut 23 of the blocking means D is screwed to the tightening side, and the outer shaft 11A is pushed and moved to the lower end side with respect to the middle shaft 11B. By this movement, the lower engagement concave portion 17 of the middle shaft 11B and the insertion hole 11a of the outer shaft 11A are matched, and the engagement convex portion 14a of one operation handle 14 is engaged with the lower engagement concave portion 17 of the middle shaft 11B. .
In this engaged state, the tapered pressing surface 51a of the movable pressing portion F6 presses the retaining projection 12h of each retaining member 12D, 12E, and the retaining projection 12h of each retaining member 12D, 12E is removed. It abuts on the tapered inner peripheral surface 50 b of the stopper holding portion 50. In this contact state, the distal end portions on the outer side in the axial radial direction of the retaining members 12D and 12E protrude outwardly from the outer peripheral surface 50a of the retaining member 50, and the retaining members 12D and 12E. The projecting tip is changed to an engagement posture that can be engaged with the opening periphery of the through hole 2 in the arc-shaped inner surface 1 a of the water pipe 1.

  In addition, in a state where the engagement convex portion 14a of one operation handle 14 is engaged with the lower engagement concave portion 17 of the middle shaft 11B, the engagement convex portion 14a of one operation handle 14 and the lower engagement of the middle shaft 11B. Between the opposing surface in the operation axis Y direction with respect to the recess 17, the cutoff elastic body 22 of the cutoff means D is removed from the cutoff release state of the outer diameter smaller than the diameter of the through hole 2 of the water pipe 1. An interchange S1 is provided that secures an operating stroke for switching from the shut-off state to the shut-off release state, or a shut-off state in which the diameter is increased to an outer diameter larger than the diameter of the through-hole 2.

[4] Fourth Stage of Blocking Operation Process As shown in FIG. 26, the operation shaft 11 is pulled upward to operate each retaining member 12D, on the opening periphery of the through hole 2 in the arc-shaped inner surface 1a of the water pipe 1. Engage the protruding tip of 12E. At this time, both the retaining members 12D and 12E are engaged along the top of the arcuate inner surface 1a of the water pipe 1 in a posture toward the tube axis along the tube axis X direction.
In a state in which the projecting tip portions of the retaining bodies 12D and 12E are engaged with the opening peripheral edge of the through hole 2, the two pressing members 20 and 21 of the blocking means D are placed in the through hole 2 of the pipe wall 1A of the water pipe 1. The blocking elastic body 22 disposed between the pressing surfaces enters.

[5] Fifth Stage of Shut-off Operation Process As shown in FIG. 27, when the expansion nut 23 of the shut-off means D is screwed to the tightening side, the outer shaft 11A is pushed and moved to the lower end side with respect to the middle shaft 11B. The blocking elastic body in a blocking release state having an outer diameter smaller than the diameter of the through hole 2 of the water pipe 1 due to the clamping action accompanying the proximity movement of the pressing surface of the upper pressing member 20 to the pressing surface of the side pressing member 21. 22 is elastically deformed into a shut-off state in which the diameter is expanded to an outer diameter larger than the diameter of the through-hole 2 of the water pipe 1, thereby blocking the through-hole 2 of the water pipe 1 in a water-tight state.

[6] Sixth stage of the shut-off work process (removal work of remaining parts)
As shown in FIG. 28, the split T-shaped pipe 3, the work on / off valve 6, and the replacement work case 7, which are the remaining parts of the through-hole closing device B to be replaced constituting the fluid equipment C, are removed from the water pipe 1. .
Even in this removed state, the protruding tips of the retaining members 12D and 12E of the retaining member 12 are engaged with the opening peripheral edge of the through-hole 2 in the arcuate inner surface 1a of the water pipe 1, so that they are in a blocked state. The blocking elastic body 22 of the blocking means D is securely and securely retained at the blocking position corresponding to the through hole 2 of the water pipe 1 against water pressure.

[7] First Stage of the Breaking Release Work Process Next, a description will be given with reference to FIGS. 27 and 29. The breaking elastic body 22 of the blocking means D is diameter-expanded to the blocking state, and the water pipe 1 is penetrated. In the state where the hole 2 is shut off in a watertight state, the water pipe 1 is connected to the split T-shaped pipe 3 which is a part of the new through-hole closing device B, the work on / off valve 6 of the fluid pipe shut-off device A and the replacement work case. 7 is installed in a watertight state.
When the assembly of the fluid equipment C including the split T-shaped tube 3 which is a part of the new through-hole closing device B is completed, the expansion nut 23 of the blocking means D is screwed to the loose side. As a result of this screwing operation, the outer shaft 11A is moved upward with respect to the middle shaft 11B, and the diameter of the outer shaft 11A is increased by releasing the pinching accompanying the separation of the pressing surface of the upper pressing member 20 with respect to the pressing surface of the lower pressing member 21. The blocking elastic body 22 in the state is elastically deformed into a blocking release state reduced in diameter by an elastic restoring force.
Further, the expansion nut 23 of the blocking means D is screwed to the slack side, and one operation handle 14 is screwed to the slack side. Pull out from the side engagement recess 17. In this state, the operating handles 14 and 15 are pulled up so that the upper engaging concave portion 16 of the middle shaft 11B and the insertion hole 11a of the outer shaft 11A are aligned, and the engaging convex portion 14a of one operating handle 14 is moved to the middle shaft 11B. The upper engaging recess 16 is engaged.
In this state, the inside of the retaining holder 50 provided at the lower end portion of the lower pressing member 21 on the outer shaft 11A side with respect to the pressing surface 51a of the pressing portion 51 provided at the lower end portion of the middle shaft 11B. The peripheral surface 50b is in a state of being separated upward. Therefore, each retaining body 12D, 12E inserted and mounted in each mounting hole 50c of the retaining holder 50 is in a state of being able to retract and move inward in the axial radial direction.

Next, as shown in FIG. 29, when the operation shaft 11 that is supported by penetrating the shaft rotation support portion F7 is rotated, the retaining bodies 12D and 12E that are in the engagement posture in the tube follow the tube axis X. The pipe axis orientation is changed to the pipe diameter orientation along the diameter direction of the water pipe 1. At this time, since the total length between the maximum outer surfaces of the distal end portions of the two retaining members 12D and 12E is formed to be larger than the inner diameter of the water pipe 1 and the diameter of the through hole 2, each retaining member The front ends of the bodies 12D and 12E are in contact with an arcuate arcuate inner surface 1a continuous with the inner surface 1b of the through hole 2 of the water pipe 1, and the retaining bodies 12D and 12E are retracted inward in the axial radial direction. Is done.
In this state, when the operation shaft 11 is pulled upward, the retaining members 12D and 12E are brought into contact with the arcuate inner surface 1a of the water pipe 1 and the inner surface 1b of the through hole 2 as shown in FIG. Furthermore, both the retaining members 12D and 12E that have been retreated inward in the axial radial direction and retreated to the insertion / removal posture are surely and smoothly moved through the through hole 2.

[8] Second Stage of Shut-off Release Work Process The retaining means E and the shut-off means D are pulled out and moved into the replacement work case 7 by the pull-out operation of the operation shaft 11 in FIG. Thereafter, the valve body 6 a of the work on-off valve 6 is closed, and the replacement work case 7 is removed from the work on-off valve 6.
Next, the work opening / closing valve 6 is provided with a cap 4 which is a part of the new through-hole closing device B, and another operation shaft to which the cap 4 is attached is provided so as to be able to move up and down and rotate. Install another replacement work case. Thereafter, the valve body 6a of the work opening / closing valve 6 is opened, and another operation shaft of another replacement work case is operated to lower the cap 4 in the replacement work case and then rotate it. The cap 4 is screwed and connected to the connecting tube portion 3C of the split T-shaped tube 3 in a watertight state.
Further, after removing the working on-off valve 6 and another replacement work case from the connecting pipe portion 3C of the split T-shaped tube 3, the cap 4 is attached to the connecting tube portion 3C of the split T-shaped tube 3 with the cap 4 being split. The detachment prevention presser cover 5 that is pressed and fixed to the connecting pipe portion 3C is fixedly connected (see FIG. 11).

  In the above-described third embodiment, the pressing portion 51 having the tapered pressing surface 51a is integrally formed at the lower end portion of the middle shaft 11B of the operation shaft 11, thereby utilizing the moving operation of the middle shaft 11B with respect to the outer shaft 11A. Thus, although the movable pressing portion F6 capable of releasing the pressure that presses both the retaining members 12D and 12E and operates to protrude into the engagement posture is configured, it is not limited to this configuration. For example, the pressing portion that is movably mounted on the lower end of the middle shaft 11B may be configured to be switched between a pressing state and a pressing release state in conjunction with an operation of a system different from the middle shaft 11B.

[Other Embodiments]
(1) In each of the above-described embodiments, the through hole 2 of the water pipe 1 is blocked by the blocking means D provided on the distal end side of the operation shaft 11. For example, the through hole 2 of the pipe wall 1 </ b> A of the water pipe 1 The communication inflow part 8 in the fluid equipment C attached to the water pipe 1, such as the internal space (branch flow path) of the connecting pipe part 3C of the split T-shaped pipe 3 fixed to the water pipe 1 in a communicating state. You may comprise so that it may interrupt | block by the interruption | blocking means D. FIG.

(2) In each of the above-described embodiments, the fluid equipment C attached to the water pipe 1 in communication with the through hole 2 of the pipe wall 1A of the water pipe 1 is divided into the split T-shaped pipe 3, the work on-off valve 6 and Although it comprised with the replacement work case 7, it is not limited to this structure.
For example, in a fluid facility in which a branch pipe having a gate valve is attached to a branch pipe portion that is integrally formed with the water pipe 1 and constitutes a part of the water pipe 1, the operation shaft 11 of the fluid pipe shutoff device A is provided. The shut-off means D and the retaining means E provided at the tip of the valve are inserted into the branch pipe part side from the downstream side of the gate valve and shut off in the retaining state, and the gate valve is replaced with a new gate valve, or In the construction for removing the branch pipe provided with the gate valve, the branch pipe provided with the gate valve constitutes the fluid equipment C.
In this case, the connection port of the branch pipe part or the connection port of the branch pipe part and the water pipe 1 becomes the through hole 2 on the water pipe 1 side.
In short, as the fluid equipment C, the shut-off means D and the retaining means E provided at the tip of the operating shaft 11 of the fluid pipe shut-off device A are sized to be inserted downstream of the through hole 2 on the water pipe 1 side. Any structure may be used as long as the communication space is sealed and the operation shaft 11 of the fluid pipe blocking device A can be mounted in a watertight state.

(3) In the first embodiment described above, the inner peripheral surface side angle of the lower pressing member 21 that can push up the posture holding portion F3 of the posture switching execution means F against the elastic restoring force of the blocking elastic body 22. The longitudinal cross-sectional shape formed between the opposing surfaces of the portion and the outer peripheral surface of the central shaft 11B is configured from the annular temporary holding space 37 having a substantially triangular shape, but is not limited to this configuration. A configuration in which the retaining member 12 is temporarily held in the insertion / extraction posture may be employed. In this case, a magnet that temporarily holds the retaining member 12 in the insertion / removal posture may be provided on the outer shaft 11A of the operation shaft 11 or the lower pressing member 21 of the blocking means D.
In short, as the posture holding portion F3, the retaining member 12 can be temporarily fixed and held in the insertion / extraction posture, and the temporary holding is released by the contact between the retaining member 12 and the arcuate inner surface 1a of the water pipe 1. Any structure may be adopted as long as it is a thing.
Further, the attachment position of the posture holding portion F3 may be any one of the blocking means D, the operation shaft 11, or the facing portion between the blocking means D and the operation shaft 11.

(4) In the first embodiment described above, only one end portion of the retaining member 12 engages with the opening peripheral edge of the through hole 2 in the arcuate inner surface 1a of the water pipe 1 with respect to the shaft support portion F2 of the posture switching execution means F. In this state, the operation shaft 11 is supported on the fluid equipment C so as to be pivotable in a three-dimensional direction. However, the operation shaft 11 can be swung around one rocking fulcrum. You may comprise in the rocking | fluctuation type shaft support structure supported by.
Further, the shaft support portion F2 of the posture switching execution means F may be configured as a parallel movement type shaft support structure that moves the operation shaft 11 in parallel in a posture along the vertical direction with respect to the fluid equipment C.

  (5) In the above-described embodiment, the water pipe 1 is exemplified as the fluid pipe, but another fluid pipe through which industrial water, gas, or the like flows may be used.

1 Fluid pipe (water pipe)
1A Pipe wall 1a Inner surface (arc-shaped inner surface)
DESCRIPTION OF SYMBOLS 1b Inner surface 1c Outer surface 2 Through-hole 8 Communication inflow part 11 Operation shaft 11A Outer shaft 11B Middle shaft 12 Detachment member 12B Detachment body 12C Detachment body 12D Detachment body 12E Detachment body A Fluid pipe shutoff device C Fluid equipment D Shutoff means E Detachment means F Attitude switching execution means F1 Oscillating pivot attachment structure F2 Shaft support part F3 Posture holding part F4 Energizing holding part F5 Shaft rotation support part F6 Movable pressing part F7 Shaft rotation support part X Pipe axis Y operation Shaft core

Claims (8)

Install the operating shaft of the fluid pipe shut-off device in the penetrating state so that it can be moved in and out of the fluid equipment attached to the fluid pipe in communication with the through hole of the fluid pipe. An engagement for passing the stopper member from the communicating inflow portion in the fluid equipment through the through hole in an insertion / extraction posture and inserting the stopper member into the fluid pipe, and engaging the stopper member with the opening periphery of the through hole in the fluid pipe A blocking operation step of switching to a posture and blocking the through hole or the communication inflow portion in the fluid equipment communicating with the through hole by a blocking means provided on the tip end side of the operation shaft;
A shut-off release operation step of releasing the shut-off means and passing the through-hole through the through-hole in a state in which the retaining member is switched to the insertion / extraction posture and pulling out to the communication inflow portion in the fluid equipment. A through hole blocking work method,
In the blocking operation step, the retaining member is held in the insertion / removal posture by the posture holding portion that holds the retaining member pivotably attached to the tip end portion of the operation shaft in the insertion / removal posture. The posture holding portion is inserted into the fluid pipe through the through hole from the communication inflow portion in the fluid equipment, and the inserted retaining member is brought into contact with the inner surface of the fluid pipe. Switch the retaining member to the engaged posture against the holding force,
In the blocking release operation step, the tip end portion of the operation shaft is moved in the diameter direction of the through hole, and only one end portion of the retaining member is engaged with the opening peripheral edge of the through hole on the inner surface of the fluid pipe. In this state, by pulling out the operating shaft, the through hole blocking work method for the fluid pipe is characterized in that the through hole is passed while the retaining member is switched and swung to the insertion / extraction posture . Mount the operating shaft of the fluid pipe shut-off device in the penetrating state so that it can be moved in and out of the fluid equipment attached to the fluid pipe in communication with the through hole of the fluid pipe. Engagement for inserting the stopper member into the fluid pipe through the through hole from the communicating inflow portion in the fluid equipment into the fluid pipe, and engaging the stopper member with the peripheral edge of the through hole in the fluid pipe A blocking operation step of switching to the posture and blocking the through hole or the communication inflow portion in the fluid equipment communicating with the through hole by the blocking means provided on the tip end side of the operation shaft;
A shut-off release operation step of releasing the shut-off means and passing the through-hole through the through-hole in a state in which the retaining member is switched to the insertion / extraction posture and pulling out to the communication inflow portion in the fluid equipment. A through hole blocking work method,
In the blocking work process, the constituent member of the retaining member can be switched between an engagement posture along the axial direction of the operation shaft and an insertion / removal posture constricted and swung toward the proximal end side of the operation shaft. In addition, a plurality of retaining members pivotally attached to the operation shaft in a state of being biased to the engagement posture are brought into contact with the inner surface of the through hole formed in the tube wall of the fluid pipe And passing through the through-hole while switching and swinging to the insertion / extraction posture, and after passing, the plurality of retaining members are returned to the engagement posture by the biasing force in the orientation toward the tube axis along the tube axis,
In the shut-off release work step, the plurality of retaining bodies are changed from the pipe axis core orientation to the pipe radial orientation along the diameter direction of the fluid pipe by rotating the operation shaft. The abutment with the arcuate inner surface of the fluid pipe squeezes and swings the plurality of retaining bodies, and in this state, pulls out the operating shaft, thereby the arcuate inner surface of the fluid pipe and the inner surface of the through hole abutment by the through-hole shutoff operation method of the plurality of retainer stream you, characterized in that the body of is swung Subomi to the insertion position to pass the through hole body pipe. Mount the operating shaft of the fluid pipe shut-off device in the penetrating state so that it can be moved in and out of the fluid equipment attached to the fluid pipe in communication with the through hole of the fluid pipe. Engagement for inserting the stopper member into the fluid pipe through the through hole from the communicating inflow portion in the fluid equipment into the fluid pipe, and engaging the stopper member with the peripheral edge of the through hole in the fluid pipe A blocking operation step of switching to the posture and blocking the through hole or the communication inflow portion in the fluid equipment communicating with the through hole by the blocking means provided on the tip end side of the operation shaft;
A shut-off release operation step of releasing the shut-off means and passing the through-hole through the through-hole in a state in which the retaining member is switched to the insertion / extraction posture and pulling out to the communication inflow portion in the fluid equipment. A through hole blocking work method,
In the shut-off operation step, the engagement member is configured to be held on the operation shaft so as to be movable in the axial radial direction by the constituent member of the retaining member, and to project outwardly in the axial radial direction; A plurality of retaining bodies that can be switched to an insertion / extraction posture that has been retracted and moved inward in the axial radial direction is set to an insertion / extraction posture, and the passage through the through hole formed in the wall of the fluid pipe is allowed to pass. Later, by a movable pressing portion provided at the distal end portion of the operation shaft, the plurality of retaining members are pressed in a posture toward the tube axis along the tube axis to project and move to the engagement posture,
In the shut-off release operation step, the pressure by the movable pressing portion is released, and the plurality of retaining bodies are moved from the tube axis core orientation to the diameter direction of the fluid pipe by rotating the operation shaft. When the posture is changed, the plurality of retaining members are retracted by contact with the arcuate inner surface of the fluid pipe when the posture is changed, and the operation shaft is pulled out in this state to thereby draw the arcuate shape of the fluid pipe. the inner surface and the through hole shutoff operation method of the through hole of the plurality of retainer flow body to you characterized by passing the through hole by retired moved to the insertion position the body tube by the contact with the inner surface of. When the retaining member is switched and swung to the insertion / extraction posture by pulling out the operation shaft with only one end portion of the retaining member engaged with the opening peripheral edge of the through hole, the retaining member The through hole blocking work method for a fluid pipe according to claim 1 , wherein the posture holding portion is temporarily held in an insertion / extraction posture . The fluid communicating with the through-hole or the through-hole in the tip-side portion of the operation shaft that is movable in and out with respect to the fluid equipment attached to the fluid pipe in a state communicating with the through-hole of the fluid pipe Blocking means for blocking the communication inflow part in the equipment, an insertion / extraction posture that can be inserted into the fluid pipe through the through hole from the communication inflow part in the fluid equipment, and opening of the through hole in the inner surface of the fluid pipe A fluid pipe shut-off device provided with retaining means provided with a retaining member that can be switched to an engagement posture that engages with a peripheral edge,
Posture switching execution means for performing switching operation to at least one of the switching operation to the engagement posture or the insertion / extraction posture of the retaining member by contact with the fluid pipe,
The posture switching execution means includes a swing pivot structure for pivotably pivoting the retaining member between the insertion / extraction posture and the engagement posture with respect to the distal end portion of the operation shaft, and the fluid equipment. The operation shaft can be held in the insertion / removal posture, and the shaft support portion in which the tip portion of the operation shaft can move in the diameter direction of the through-hole can be held in the insertion / removal posture. A shutoff device for a fluid pipe, comprising: a posture holding portion that allows a swinging movement of the retaining member to an engagement posture by contact between the retaining member and an inner surface of the fluid pipe. The fluid communicating with the through-hole or the through-hole in the tip-side portion of the operation shaft that is movable in and out with respect to the fluid equipment attached to the fluid pipe in a state communicating with the through-hole of the fluid pipe Blocking means for blocking the communication inflow part in the equipment, an insertion / extraction posture that can be inserted into the fluid pipe through the through hole from the communication inflow part in the fluid equipment, and opening of the through hole in the inner surface of the fluid pipe A fluid pipe shut-off device provided with retaining means having a retaining member that can be switched to an engagement posture that engages with a peripheral edge,
Posture switching execution means for performing switching operation to at least one of the switching operation to the engagement posture or the insertion / extraction posture of the retaining member by contact with the fluid pipe ,
The posture switching execution means is a constituent member of the retaining member, and swings by constricting the engagement posture along the axial direction of the operation shaft at the distal end portion of the operation shaft and the proximal end side of the operation shaft. A plurality of retaining bodies provided to be swingably switchable between the insertion and removal postures, and the through-holes that hold the retaining members in the engagement posture and are formed in the wall of the fluid pipe By urging and supporting the operation shaft with respect to the fluid equipment, the urging holding portion that allows the swinging movement of the retaining body to the insertion / extraction posture accompanying the contact with the inner surface of the hole, A shaft rotation support portion is provided that allows the plurality of retaining members to be freely changed to a tube axis orientation along the tube axis direction of the fluid tube and a tube diameter orientation along the diameter direction of the fluid tube. A shutoff device for fluid pipes. The fluid communicating with the through-hole or the through-hole in the tip-side portion of the operation shaft that is movable in and out with respect to the fluid equipment attached to the fluid pipe in a state communicating with the through-hole of the fluid pipe Blocking means for blocking the communication inflow part in the equipment, an insertion / extraction posture that can be inserted into the fluid pipe through the through hole from the communication inflow part in the fluid equipment, and opening of the through hole in the inner surface of the fluid pipe A fluid pipe shut-off device provided with retaining means having a retaining member that can be switched to an engagement posture that engages with a peripheral edge,
Posture switching execution means for performing switching operation to at least one of the switching operation to the engagement posture or the insertion / extraction posture of the retaining member by contact with the fluid pipe,
The posture switching execution means is a constituent member of the retaining member, and is provided at the distal end portion of the operation shaft so as to be movable in and out of an engagement posture and an insertion / removal posture, and an arcuate inner surface of the fluid pipe and A plurality of retaining members that are retracted in contact with the inner surface of the through-hole formed in the tube wall of the fluid tube, and a pressing member that presses the retaining member to project and move to an engagement posture. A releasable movable pressing portion, and the operation shaft is rotatably supported with respect to the fluid equipment, so that the retaining body is oriented toward the tube axis along the tube axis direction of the fluid tube and the fluid. pivoting bearing and is not that flow body vessel interrupting device provided to freely change the tube radially directed orientation along the diameter direction of the pipe. The operation shaft is configured as an inner / outer double shaft structure, the blocking means is provided on the distal end side of the operation shaft, and by relative movement of the operation shaft in the direction of the operation axis between the middle shaft and the outer shaft. 6. The blocking member of the retaining member is provided at a distal end portion of the middle shaft that protrudes from the blocking member and is configured to be switchable between a blocking state and a blocking release state. 8. The fluid pipe shut-off device according to any one of 7 above.

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