JP5658630B2 - Method for forming through-hole of lining pipe and membrane cutting device for lining pipe - Google Patents

Description

  The present invention provides a lining for forming a through hole such as a valve body mounting hole or a branch hole in a pipe wall of a fluid pipe having a resin lining layer formed on the inner peripheral surface while maintaining a fluid flow in the fluid pipe. The present invention relates to a technology for forming a through-hole in a pipe.

  As a measure to prevent aging due to internal corrosion of the existing fluid pipe, for example, a flexible resin (polyethylene resin, etc.) seal hose in which an adhesive is applied to the inner peripheral surface in advance in the existing fluid pipe. A lining method in which a resin lining layer is formed by sequentially feeding the seal hose to the inner peripheral surface of the fluid pipe while being reversed by air pressure, or a lining resin such as a polyethylene pipe having a slightly smaller diameter in the existing fluid pipe After inserting the pipe, the lining construction method in which cement milk is pressed between the outer peripheral surface of the lining resin pipe and the inner peripheral surface of the existing fluid pipe to form a three-layer structure, or the lining is made from one opening of the existing fluid pipe Resin (two-component mixed epoxy resin, etc.) is transported by high-speed air flow or lining pigs that move in the pipe, etc. Lining method, etc. to form the training layer is adopted.

  When a through hole is formed in the pipe wall of the fluid pipe in which the resin lining layer as described above is formed while maintaining the fluid flow in the fluid pipe, conventionally, the fluid pipe has the fluid. A housing mounting step of mounting a housing provided with a work on / off valve in a state in which a work area for forming a through-hole of a tube is sealed, and a drilling device provided with a hole saw as an example of a punching tool connected to the housing; A through-hole comprising a perforation step of cutting and removing the resin lining film of the resin lining layer facing the through-hole while forming a through-hole in the pipe wall of the fluid pipe by feeding the hole saw of the perforating device to the fluid pipe side A forming method is employed (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 10-47577

  In the conventional method for forming a through-hole of a lining pipe, a pipe wall and a resin lining layer of a fluid pipe are cut with a hole saw of a drilling device, but the cutting tip provided at the tip of the hole saw is the main body of cutting. It is constructed in a chip shape intended for fluid pipes with high hardness such as certain cast iron pipes and steel pipes, and the resin lining layer has a certain degree of rigidity by hardening after construction, but still has moderate elasticity as a resin. Therefore, there was the following inconvenience.

  That is, when the through hole is formed in the pipe wall of the fluid pipe, the hole saw of the perforating apparatus is pulled up to the housing side, and the cut wall piece and the resin lining film of the fluid pipe cut and separated by the hole saw are held. If the resin lining film is not retained, it is necessary to repeat the process of increasing the feeding amount of the hole saw to the fluid pipe side and feeding it again, so the resin lining film facing the through hole is cut and separated. It takes a lot of work.

  In addition, at this time, the resin lining film facing the through hole of the fluid pipe is cut in a push-off state in which the resin lining film is pushed into the pipe with a hole saw. Therefore, the resin lining layer on the inner peripheral surface side of the pipe continuous with the resin lining film As a result, there is a problem that rust is generated on the inner peripheral surface of the fluid pipe from which the resin lining layer has been peeled off.

  The present invention has been made in view of the above-mentioned actual situation, and the main problem is that the formation of a through hole in an uninterrupted flow state with respect to the lining pipe is a resin lining on the inner peripheral surface side of the pipe that is continuous with the periphery of the through hole. It is in providing a through-hole forming method that can be performed efficiently and reliably while suppressing layer peeling, and a membrane cutting device for a lining pipe used therefor.

A first characteristic configuration according to the present invention is the penetration of a lining pipe that forms a through hole in a pipe wall of a fluid pipe having a resin lining layer formed on the inner peripheral surface while maintaining the flow of fluid in the fluid pipe. A hole forming method comprising:
A housing mounting step of mounting a housing provided with a work on / off valve in a state in which the through hole forming work area of the fluid pipe is sealed in the fluid pipe;
A drilling operation step of forming a through hole in a pipe wall of a fluid pipe with a drilling tool of a drilling device connected to the housing, and then removing the drilling device provided with the cutting wall piece from the housing;
Membrane cutting that attaches to the housing a membrane cutting device capable of cutting the resin lining film of the resin lining layer facing the through hole of the tube wall, and cuts and separates the resin lining film substantially along the inner peripheral edge of the through hole And a work process.

  According to the above configuration, the piercing operation by the piercing tool of the piercing device is finished when the through hole is formed in the pipe wall of the fluid pipe, and for the resin lining film of the resin lining layer facing the through hole, The exclusive membrane cutting device attached to the housing can reliably cut and separate substantially along the inner periphery of the through hole.

  Therefore, as in the conventional method, until the cutting wall piece and the resin lining film cut and separated are held by the piercing tool of the piercing device pulled up to the housing side, the feeding to the fluid pipe side of the piercing tool is performed. Since there is no need to increase the amount of squeezing and repeatedly feed the resin lining membrane facing the through hole of the fluid pipe, it is possible to suppress an increase in the amount of pushing into the pipe inside, so there is no continuous flow with respect to the lining pipe. The through hole can be efficiently and reliably formed while suppressing the peeling of the resin lining layer on the inner peripheral surface side of the pipe continuous with the periphery of the through hole.

  According to a second characteristic configuration of the present invention, in the film cutting operation step, the resin lining film is substantially along the inner peripheral edge of the through hole in a state where the resin lining film is retrievably held using the film cutting device. The point is to cut and separate.

  According to the above configuration, the resin lining film cut and separated substantially along the inner peripheral edge of the through hole can be reliably recovered by the film cutting function and the film holding function of the film cutting device, and the resin lining film It is possible to improve the efficiency of the membrane cutting operation by maintaining the posture in which the film can be easily cut and separated.

  A third characteristic configuration according to the present invention is the film cutting apparatus used in the method for forming a through-hole of a lining pipe having the first or second characteristic configuration described above, wherein the resin lining film is attached to the through-hole. A membrane cutting jig that can be cut and separated substantially along the inner peripheral edge and a membrane recovery jig that holds the resin lining film in a recoverable state are provided.

  According to the above configuration, when the resin lining film facing the through hole is cut and separated by the film cutting jig, the resin lining film can be held by the film recovery jig, so that it substantially follows the inner periphery of the through hole. Thus, the resin lining film that has been cut and separated can be reliably recovered, and the resin lining film can be held in a posture in which it can be easily cut and separated, thereby improving the film cutting work efficiency.

  According to a fourth characteristic configuration of the present invention, the cutting operation shaft of the membrane cutting jig is freely slidable in the direction of the hole axis of the through hole with respect to the membrane cutting work case connected to the housing. And is supported so as to be swingable in the radial direction of the through hole, and the recovery operation shaft of the membrane recovery jig is at least in the axial direction of the hole of the through hole with respect to the membrane cutting work case It is in the point that it is pierced and supported so as to be slidable.

  According to the above configuration, from the drilling operation step, only the membrane cutting operation case in which the cutting operation shaft of the membrane cutting jig and the recovery operation shaft of the membrane recovery jig are supported through the housing are connected to the housing. It is possible to smoothly move to the membrane cutting work process, and while avoiding interference with the recovery operation axis of the membrane recovery jig by utilizing the sliding and swinging operation functions of the cutting operation axis of the membrane cutting jig The resin lining film facing the through hole can be smoothly cut and separated substantially along the inner peripheral edge of the through hole.

  According to a fifth characteristic configuration of the present invention, the cutting operation axis of the membrane cutting jig is arranged on or near the hole axis of the through hole in the membrane cutting work case.

  According to the above configuration, the cutting operation axis of the membrane cutting jig having a wide range of movement operation in the radial direction of the through hole as compared with the recovery operation axis of the film recovery jig is set on or near the hole axis of the through hole. Therefore, the resin lining film facing the through hole can be cut and separated efficiently and reliably.

  A sixth characteristic configuration according to the present invention is that a plurality of work windows are provided in the membrane cutting work case.

  According to the above-described configuration, the membrane cutting treatment is performed while irradiating illumination light from one working window provided on the membrane cutting work case to the work location in the housing and visually confirming the work location from the other work window. Since the tool and the membrane recovery jig can be operated, the resin lining membrane facing the through hole can be efficiently and reliably cut and separated for recovery.

Sectional side view when connecting a split T-shaped pipe to a water pipe showing the first embodiment of the present invention Partially cutaway side view when working open / close valve is connected to split T-shaped pipe Partially cutaway side view when a punching device is connected to a work on / off valve Partial cutaway side view at the end of drilling Partially cutaway side view when a membrane cutting device is connected to the working on-off valve Cross-sectional front view when a membrane cutting device is connected to the working on-off valve Plan view of canopy for membrane cutting work case Enlarged sectional view of the main parts of the membrane cutting jig and membrane recovery jig Partially cutaway side view during membrane cutting work with membrane cutting jig and membrane recovery jig Cross-sectional front view during membrane cutting work with membrane cutting jig and membrane recovery jig Cross-sectional front view at the end of membrane cutting operation Side view of partly cutout at the end of membrane cutting operation Cross-sectional side view when the valve mounting work case is connected to the work on / off valve Partially cutaway side view when the upper case of the gate valve is connected to the split T-tube The partially cutaway front view when the membrane cutting device is connected to the on-off valve for working, showing the second embodiment of the present invention

[First Embodiment]
FIGS. 1 to 14 show a water pipe (fluid) in the water pipe 2 on a pipe wall 2A of a cast pipe made of cast iron pipe, which is an example of a fluid pipe having a resin lining layer 1 formed on the inner peripheral surface. The through-hole formation method of the lining pipe | tube which forms the through-hole 3 used as a valve body mounting hole with the state of the continuous water which maintained the flow of this, and the new construction of the gate valve D using this method are shown.

  In this through-hole forming method, a housing H having a work on / off valve 5 attached to the water pipe 2 in a state where the through-hole forming work area of the water pipe 2 is sealed, and a water pipe 2 sealed by the housing H A punching device A for forming a through hole 3 in the tube wall 2A, and the resin lining film 1a penetrating through the resin lining film 1a in a state where the resin lining film 1a of the resin lining layer 1 facing the through hole 3 of the tube wall 2A is retrievably held. A membrane cutting device B for cutting and separating along the inner peripheral edge of the hole 3 is used.

The housing H is fixedly connected in a watertight manner to a split T-shaped tube 4 that is externally fixed in a watertight state at a through hole formation portion of the water pipe 2 and a connection flange 4C in a connecting pipe portion 4B of the split T-shaped tube 4. And the working on-off valve 5.
As shown in FIG. 14, the split T-tube 4 is used as it is as a lower case constituting a valve casing of the gate valve D with an upper case 56 described later after the membrane cutting operation by the membrane cutting device B. .

  As shown in FIG. 1 and FIG. 6, the split T-shaped pipe 4 is composed of a split joint body 4A that is divided into three in the pipe circumferential direction that can be sheathed from the pipe radial direction with respect to the water pipe 2. At both ends in the pipe circumferential direction of each split joint body 4A, adjacent end portions of the split joint body 4A sheathed on the water pipe 2 are attached and detached via a plurality of bolts 6A and nuts 6B as an example of the fastening means 6. A connecting flange 4a for fixedly connecting freely is integrally formed.

  Further, a through-hole formed in the pipe wall 2 </ b> A of the water pipe 2 is formed in the central part in the pipe axis direction in the split joint body 4 </ b> A mounted on the upper side of the water pipe 2 and in the central part in the pipe circumferential direction. A connecting pipe portion 4B that communicates with the hole 3 from the pipe diameter direction is integrally formed to project.

  In addition, the split T-shaped pipe 4 is connected to the water pipe by tightening the outer peripheral surface of the water pipe 2 from the outside in the pipe radial direction at a plurality of circumferential positions at both ends in the pipe axis direction of the split joint body 4A. A fixing bolt 7 that is firmly fixed to the pipe 2 in a predetermined posture is provided, and the seal holding groove formed on the inner peripheral surface of the split joint body 4A is in a watertight state between the outer peripheral surface of the water pipe 2 A rubber packing 8 for sealing is attached.

  In the valve case 5A of the working on-off valve 5, as shown in FIGS. 2, 4, and 6, there is provided a valve body 5C that is opened and closed in the horizontal direction in accordance with the rotation operation of the handle 5B. A cylindrical lower connecting tube portion 5D that can be externally fitted to the connecting flange 4C of the connecting pipe portion 4B is integrally formed at the lower portion of the valve case 5A.

  On the upper side of the inner peripheral surface of the lower connecting cylinder portion 5D and in the vicinity of the lower side of the opening / closing movement path of the valve body 5C, the peripheral portion on the upper surface of the connecting flange 4C of the connecting pipe portion 4B An annular annular contact portion 5E that comes into contact with the mounting portion in an installed state is integrally formed, and the annular contact portion 5E is placed on the connection flange 4C of the connection pipe portion 4B in the lower connection cylinder portion 5D. In a supported state, a pulling bolt 9 is provided as a pulling fixing means for pulling and fixing the valve case 5A to the connecting flange 4C while being engaged with the lower surface (back surface) of the connecting flange 4C.

  A cylindrical upper connecting cylinder portion 5F that is concentrically connected to the lower connecting cylinder portion 5D and forms a flow passage in the valve is integrally formed on the upper portion of the valve case 5A. A connecting flange 5G for attaching the perforating apparatus A, the membrane cutting apparatus B and the like is integrally formed at the upper opening end.

  As shown in FIGS. 5 to 12, the membrane cutting apparatus B applies the resin lining membrane 1a to a membrane cutting work case 11 that is detachably connected to the connection flange 5G of the work on / off valve 5 in a watertight state. A membrane cutting jig B1 that can be cut and separated substantially along the inner periphery of the through-hole 3 and a membrane recovery jig B2 that holds the resin lining film 1a in a recoverable state are mounted.

  As shown in FIGS. 6 and 8, the membrane cutting jig B <b> 1 is configured by a first lid center position passing through the hole axis Y of the through hole 3 in the canopy 11 </ b> A of the membrane cutting work case 11. A cutting operation shaft 13 having a length capable of cutting the resin lining film 1a with sufficient margin from the outside of the case is slidable in the bearing portion 12 along the hole axis Y direction of the through hole 3 and penetrates. It is supported so as to be able to swing in the radial direction of the hole 3 and to be rotatable around the hole axis Y of the through hole 3, and to a male screw portion 13 a formed at the lower end of the cutting operation shaft 13. A cylindrical attachment member 15 having a saw blade 14 which is an example of a cutting tool is screwed and fixed.

  The saw blade 14 is fixed by a bolt 16 so as to be detachable in a state where the saw blade 14 is inclined by a predetermined angle with respect to the mounting member 15, and the cutting operation shaft 13 has a cutting operation preceding the mounting member 15. The mounting member 15 is positioned between the retaining nut 17 screwed to the male threaded portion 13a of the shaft 13 and the lower surface (inner surface) of the canopy 11A, and the mounting member 15 is attached to the canopy 11A by the sudden rise of the cutting operation shaft 13 by water pressure. An elastic buffer body 18 such as urethane rubber that relieves an impact at the time of collision with the lower surface of the rubber is packaged.

  As the saw blade 14, a plurality of types having different cutting performances such as the pitch, angle and size of the blade edge are prepared, and the optimum saw blade 14 is selected from the state of the resin lining film 1 a at the end of the drilling operation by the drilling apparatus A. Before the step of connecting the membrane cutting work case 11 to the connecting flange 5G of the work opening / closing valve 5, the detaching operation of the mounting member 15 to the cutting operation shaft 13 or the detaching operation of the saw blade 14 to the mounting member 15 The saw blade 14 selected by is attached.

  Further, as shown in FIG. 6, a mounting arm 21 having a pair of left and right first locking rings 20 is fastened and fixed to the upper part of the cutting operation shaft 13 by a screw member 22 with a hanging ring, so that the membrane cutting operation is performed. The second locking ring 23 is attached to a plurality of locations (two locations in the present embodiment) of the canopy 11A of the case 11 and the first locking ring 20 on the upper side of the cutting operation shaft 13 and the first locking ring 23 on the canopy 11A side. A pop-out preventing means C for preventing the upward movement of the cutting operation shaft 13 by water pressure can be mounted across the two locking rings 23.

  As shown in FIGS. 6 and 8, the membrane recovery jig B2 is configured by a first portion provided in a portion that is biased radially outward from the first bearing portion 12 in the canopy 11A of the case 11 for membrane cutting operation. 2 In the bearing portion 25, a recovery operation shaft 26 having a length capable of holding and operating the resin lining film 1a with a margin from the outside of the case is slidable along the hole axis Y direction of the through hole 3. In addition, the through hole 3 is swingably supported in the radial direction of the through hole 3, and is rotatably supported around an axis parallel to the hole axis Y of the through hole 3, and is formed at the lower end portion of the recovery operation shaft 26. A film holder 27 having a pair of film locking claws 27A that can be locked to the lower surface of the resin lining film 1a in a state of passing through the resin lining film 1a is screwed and fixed to the male screw portion 26a. Yes.

  A resin lining film formed at the lower end of the film holder 27 is formed by a center drill 46 positioned at the center of a hole saw (cylindrical rotary cutter) 45, which is an example of a hole punch, at the time of a hole drilling operation by the hole punching apparatus A. A taper taper surface 27a for insertion and guidance into the drill hole 1b of 1a is formed, and at each of two locations in the circumferential direction of the outer peripheral surface of the membrane holder 27, each membrane locking claw 27A can be stored. A recess 27b is formed.

  Each of the membrane locking claws 27A is pivotally attached to the lower end side portion of the storage recess 27b of the membrane holder 27 so as to be swingable in an eccentric state in which an outward urging force is generated by its own weight. Yes.

  Therefore, when the film holder 27 is inserted into the drill hole 1b of the resin lining film 1a, the two film locking claws 27A are housed and swung in the housing recess 27b by contact with the peripheral edge of the drill hole 1b of the resin lining film 1a. Immediately after the penetration, the two membrane locking claws 27A stored in the storage recess 27b jump out and swing, and the two membrane locking claws 27A come into contact with the lower end surface of the storage recess 27b so as to be horizontally engaged. Maintained in a stopped position.

  The recovery operation shaft 26 is positioned between the retaining nut 17 screwed to the male screw portion 26a of the recovery operation shaft 26 and the lower surface of the canopy 11A prior to the screwing operation of the membrane holder 27. An elastic buffer 18 such as urethane rubber is provided to alleviate the impact when the membrane holder 27 collides with the lower surface of the canopy 11A due to the rapid rise of the recovery operation shaft 26 due to water pressure.

  As shown in FIG. 6, an attachment arm 29 having a pair of left and right third locking rings 28 is attached to the upper portion of the recovery operation shaft 26, as shown in FIG. 6. A pop-out preventing means C for preventing the recovery operation shaft 26 from jumping upward due to water pressure can be mounted across the third locking ring 28 and the second locking ring 23 on the canopy 11A side. It is configured.

  The first bearing portion 12 and the second bearing portion 25 are configured in the same structure. Specifically, as shown in FIG. 8, the lower half side of the shaft insertion hole 32 formed through the canopy 11A, The upper and lower portions of the shaft insertion hole 32 rotatably support the bearing spherical body 33. The taper restricting surface 32a expands downward to restrict the maximum swing range of the cutting operation shaft 13 and the recovery operation shaft 26. It is comprised by the partial spherical receiving surface 32b.

  Further, the bearing spherical body 33 is formed with a shaft hole 33a through which the cutting operation shaft 13 and the recovery operation shaft 26 are slidably and rotatably penetrated, and the canopy 11A is provided with the bearing spherical body 33. A holding plate 34 having a partial spherical holding surface 34 a for guiding the rotation is attached by a bolt 35.

  A first seal member 36 is provided on the inner peripheral surface of the shaft hole 33a of the bearing spherical body 33 to seal the space between the outer peripheral surface of the cutting operation shaft 13 and the outer peripheral surface of the recovery operation shaft 26 in a watertight manner. A second sealing material 37 is provided on the pressing surface 34 a of the pressing plate 34 to seal the space between the outer peripheral surface of the bearing spherical body 33 in a watertight manner.

  As shown in FIGS. 6 and 7, two canopies 11 </ b> A are used for visually confirming the work situation such as holding work and cutting work on the resin lining film 1 a and illuminating the work place. A window 38 is provided.

  As shown in FIG. 6, the pop-out preventing means C includes a manually wound winch 42 including two locking hooks 40 and a chain 41 that can be wound and fed out.

  Next, a method for forming a through-hole in a lining pipe using the housing H, the punching device A, and the membrane cutting device B configured as described above, and a new construction of a gate valve D using this method will be described.

[1] FIG. 1 includes a connecting pipe portion 4B in a portion corresponding to the through hole 3 serving as a valve body mounting hole formed in the pipe wall 2A of the water pipe 2 in the through hole forming work area of the water pipe 2. 5 shows a split T-shaped tube connecting step for exteriorly fixing the split T-shaped tube 4 which is a component of the housing H and is divided into three parts in the pipe circumferential direction.

  As a preparatory process for the split T-shaped pipe connection process, rust, stones, sand, etc. adhering to the outer peripheral surface of the through-hole forming work area of the water pipe 2 are removed, and packings attached to the divided joint bodies 4A After cleaning the outer peripheral surface of the tube wall 2A in contact with 8, a lubricant is applied to the cleaned outer peripheral surface, and the divided joint body 4 </ b> A divided into three is attached to a predetermined mounting position of the tube wall 2 </ b> A.

  When the split T-tube 4 is externally fixed to the water pipe 2, a flange lid is attached to the connecting flange 4C of the connecting pipe portion 4B of the split T-tube 4 (not shown), and pressure water is placed in the split T-tube 4. The water pressure test is carried out.

  If the water pressure test is passed, as shown in FIG. 1, the internal space between the inner peripheral surface of the split T-shaped tube 4 and the outer peripheral surface of the water pipe 2 is in a state excluding the formation region of the through hole 3. An ultrafast cement (jet cement) 51, which is an example of a reinforcing filler, is filled to reinforce the pipe wall 2A of the water pipe 2 in which the through hole 3 is formed.

[2] FIGS. 2 and 3 show an on-off valve connecting step in which the work on-off valve 5 is connected to the connecting flange 4C of the connecting pipe portion 4B of the split T-shaped tube 4 to form the housing H, and A punching device connecting step for connecting the casing 47 of the punching device A to the connecting flange 5G of the opening / closing valve 5 in a watertight state, and the work opening / closing valve 5 and the split valve for opening the hole saw 45 and the center drill 46 of the punching device A. A drilling operation step is shown in which a circular through hole 3 is formed in the pipe wall 2A of the water pipe 2 by feeding through the connecting pipe portion 4B of the T-shaped pipe 4.

  In the opening / closing valve connecting step, the lower connecting cylinder portion 5D of the work opening / closing valve 5 is externally provided on the connecting flange 4C of the split T-tube 4 and provided at the upper portion in the lower connecting cylinder portion 5D. After the annular contact portion 5E is placed and supported on the connecting flange 4C of the connecting pipe portion 4B, the tightening operation is performed in a state where the drawing bolt 9 provided on the lower connecting cylinder portion 5D is engaged with the lower surface of the connecting flange 4C. Then, the valve case 5 </ b> A of the work on / off valve 5 is pulled and fixed to the connecting flange 4 </ b> C of the split T-shaped tube 4.

  In the lower part of the casing 47 of the perforating apparatus A, as shown in FIG. 4, the downstream flow path defined by the valve body 5C that has been valve-closed among the internal flow paths (internal space) of the valve case 5A. A connection case 49 capable of forming a storage space 48 for the hole saw 45 and the center drill 46 is provided with (the upper internal space), and a lower part of the connection case 49 is connected to the connection flange 5G of the work on-off valve 5. On the other hand, a connecting flange 49A is formed that is fixedly connected in a watertight manner via a plurality of bolts and nuts, which is an example of a fastening means.

  In the drilling process, the center drill 46 penetrates through the resin lining film 1a of the resin lining layer 1 corresponding to the through hole formation portion of the pipe wall 2A of the water pipe 2 and the hole saw 45 prior to the hole saw 45. A pair of locking claws (not shown, but the same structure as the two film locking claws 27A of the membrane holder 27 described above) provided on the center drill 46 at the time is automatically ejected by its own weight, and both locking claws Is a locking posture capable of locking to the periphery of the drill hole 1b on the inner peripheral surface side of the resin lining film 1a formed by the center drill 46.

  However, the cutting tip provided at the tip of the hole saw 45 is formed into a tip shape for a water pipe 2 having a high hardness such as a cast iron pipe or a steel pipe, which is a main body of cutting, and the resin lining layer 1 is Although it has a certain degree of rigidity due to curing after construction, it still has moderate elasticity as a resin.

  For this reason, even if the hole saw 45 can cut and separate the portion corresponding to the through-hole formation of the pipe wall 2A of the water pipe 2 into a circular shape, the portion corresponding to the through-hole formation of the resin lining layer 1 with which the cutting tip of the hole saw 45 contacts is the water pipe 2. Since it bends and deforms toward the tube axis side or deforms toward the tube axis side while peeling from the inner peripheral surface of the water pipe 2, even if a part of the resin lining layer 1 in contact with the cutting tip is cut, it is circular. Can not be cut and separated.

[3] FIG. 4 shows a drilling operation in which the center drill 46 holding the hole saw 45 and the cutting wall piece 2a of the drilling device A is returned into the storage space 48 after the through-hole 3 is formed, and the working on-off valve 5 is closed. A jig collection step is shown, and after this drilling jig collection step, a drilling device removal step is performed in which the connection flange 49A of the connection case 49 of the drilling device A is removed from the connection flange 5G of the work on-off valve 5.

  In the drilling jig collecting step, since the resin lining film 1a facing the through hole 3 is connected to the resin lining layer 1 as described above, when the hole saw 45 and the center drill 46 are lifted, the center drill 46 Both locking claws in the locking posture are forcibly pulled out from the drill hole 1b of the resin lining film 1a formed by the center drill 46, and both locking claws are cut and separated from the tube wall 2A of the water pipe 2. The cut wall piece 2 a is engaged, and only the cut wall piece 2 a is collected in the storage space 48 together with the hole saw 45 and the center drill 46.

[4] FIGS. 5 to 8 show a membrane for connecting the connection flange 11B provided at the lower end portion of the membrane cutting work case 11 of the membrane recovery jig B2 to the connection flange 5G of the work on-off valve 5 in a watertight state. A recovery apparatus connection process is shown.

  A cutting operation shaft 13 provided with a saw blade 14 as an example of a cutting tool is penetrated and supported in the first bearing portion 12 provided at the lid center position of the canopy 11A of the membrane cutting work case 11, and the lid center position is provided. A recovery operation shaft 26 provided with a film holder 27 is supported through the second bearing portion 25 provided so as to be biased outward in the radial direction.

  An optimum saw blade 14 selected from the state of the resin lining film 1a at the end of the drilling operation by the drilling apparatus A is attached to the cutting operation shaft 13.

  In this embodiment, since the inner diameter of the membrane cutting work case 11 is configured to be smaller than the inner diameter of the upper connecting cylinder portion 5F of the working on-off valve 5, the connecting flange 5G of the working on-off valve 5 and the membrane cutting are cut off. Between the connection flange 11 </ b> B of the work case 11, a joint flange 19 for adjusting the flange diameter is provided.

  In the case where the inner diameter of the membrane cutting work case 11 and the inner diameter of the upper connecting cylinder portion 5F of the work opening / closing valve 5 are configured to be the same diameter, the flange 19 for adjusting the flange diameter is omitted. Can do.

[5] FIGS. 9 and 10 show the resin lining film 1a of the resin lining layer 1 facing the through hole 3 of the tube wall 2A by operating the film cutting jig B1 and the film recovery jig B2 of the film cutting apparatus B. A film cutting operation step of cutting and separating the resin lining film 1a along the inner peripheral edge of the through-hole 3 in a state where the resin lining is held in a recoverable manner.

  In this membrane cutting work process, the membrane cutting work location in the housing H is lit from one of the two working windows 38 on the canopy 11A of the membrane cutting work case 11 with a lighting fixture. While illuminating and visually confirming the position of the membrane cutting operation from the other working window 38, the recovery operation shaft 26 of the membrane recovery jig B2 is slid and swinged to enter the membrane cutting operation case 11. The membrane holder 27 is lowered while being moved toward the lid center position, and the membrane holder 27 is moved through the drill hole 1b formed at the center position of the resin lining membrane 1a facing the through hole 3 of the tube wall 2A. .

  When the film holder 27 of the film recovery jig B2 is inserted into the drill hole 1b of the resin lining film 1a, the two film locking claws 27A of the film holder 27 come into contact with the peripheral edge of the drill hole 1b to store the storage recess 27b. The membrane locking claw 27A stored in the storage recess 27b jumps outward and swings immediately after passing through, and the membrane locking claw 27A is swung to the lower end surface in the storage recess 27b. Is maintained in a locking posture capable of locking to the peripheral portion of the drill hole 1b of the resin lining film 1a.

  Next, similarly to the above, while illuminating the membrane cutting work location in the housing H with a lighting fixture from one work window 38 and visually confirming the membrane cutting work location from the other work window 38, The cutting operation shaft 13 of the membrane cutting jig B1 is slid and swinged, or a rotation operation is added to this, and the saw blade 14 attached to the lower end of the cutting operation shaft 13 is attached to the tube wall 2A. Of the resin lining film 1 a facing the through hole 3, the cutting operation shaft 13 is reciprocated in the vertical direction by being inserted into a ruptured portion on a rotational cutting movement locus in contact with the cutting tip of the hole saw 45 or pierced into a weakened thinned portion. Then, the resin lining film 1 a is cut and separated along the inner peripheral edge of the through hole 3 by the saw blade 14.

  At this time, the recovery operation shaft 26 of the membrane recovery jig B2 is slightly slid and swinged upward to adjust the resin lining film 1a to a posture most suitable for cutting with the saw blade 14, thereby reducing the membrane. The cutting work efficiency can be improved.

  In the above-described membrane cutting operation process, the recovery operation shaft 26 by water pressure extends over both the third locking rings 28 of the mounting arm 29 provided on the upper portion of the recovery operation shaft 26 and the second locking ring 23 on the canopy 11A side. The pop-out prevention means C for preventing the upward movement of the head is mounted, but the cut-out operation shaft 13 is not mounted with the pop-out prevention means C.

  Note that the cutting operation shaft 13 for film cutting slides over both the first locking rings 20 of the mounting arm 21 provided on the upper portion of the cutting operation shaft 13 and the second locking ring 23 on the canopy 11A side. Further, the pop-out prevention means C may be mounted in a loose state that allows a swing operation or a rotation operation applied as necessary.

[6] FIGS. 11 and 12 show that the cutting operation shaft 13 of the membrane cutting jig B1 and the recovery operation shaft 26 of the membrane recovery jig B2 are respectively slid upward, and the saw blade 14 of the cutting operation shaft 13 is operated. After the membrane holder 27 of the recovery operation shaft 26 that holds and holds the cut and separated resin lining membrane 1a is taken out into the storage space 11C in the membrane cutting work case 11, the work on-off valve 5 is opened. The cutting membrane collection | recovery process of valve-closing operation is shown.

  After this cutting membrane recovery step, the membrane cutting for releasing the membrane cutting work case 11 from the working on-off valve 5 is released by releasing the connection between the connecting flange 5G of the working on-off valve 5 and the flange 19 for adjusting the flange diameter. Perform the device removal process.

[7] FIG. 13 shows a connecting flange 55A fixedly connected in a watertight manner to the connecting flange 5G of the working on-off valve 5 and a lifting guide member 55C for penetrating and supporting the lifting operation shaft 55B in a watertight manner. In the valve mounting work case 55 provided with the upper and lower bearing portions 56a of the upper case 56 of the gate valve D, the female thread portion of the suspension connecting member 55D attached to the lower end portion of the lifting operation shaft 55B. Then, the valve mounting work case 55 in which the upper case 56 is assembled is suspended and conveyed on the work on / off valve 5 by a crane or the like. This shows a valve mounting work case mounting process for fixedly connecting the connecting flange 55A to the connecting flange 5G of the work on-off valve 5.

  The upper case 56 of the gate valve D includes an upper case body 56A having a lower connection flange 56b fixedly connected in a watertight manner to the connection flange 4C of the split T-shaped tube 4 with a bolt 57 for fixed connection, The valve cover 56B is fixedly connected in a watertight manner to a connection flange 56c formed at the upper end of the upper case body 56A. The bearing 56a of the valve cover 56B includes a valve of the gate valve body 58. The rod 59 is supported by penetration in a watertight state.

  Next, the upper case 56 and the gate valve body 58 of the gate valve D are pushed into a predetermined mounting position against the water pressure between the operating rod 60 provided at the upper end of the lifting operation shaft 55B and the valve mounting work case 55. After providing a jack mechanism (not shown) for operation, the work on / off valve 5 is opened and the jack mechanism is lowered to open and close the lower connecting flange 56b of the upper case 56. The valve 5 is lowered to a position where it abuts on the connecting flange 4 </ b> C of the split T-tube 4 through the internal flow path of the valve 5.

  At this time, the connecting flange 4C of the split T-tube 4 is provided with positioning bolts 61 that engage with screw holes 56d formed in the lower connecting flange 56b of the upper case 56. By the positioning guide action by 61, the mounting position of the lower connecting flange 56b of the upper case 56 with respect to the connecting flange 4C of the split T-shaped tube 4 is automatically corrected and fixed to a predetermined mounting position.

  When the mounting position of the lower connection flange 56b of the upper case 56 with respect to the connection flange 4C of the split T-tube 4 is determined, the connection flange 4C of the split T-tube 4 and the lower connection flange 56b of the upper case 56 are connected. The valve case coupling | bonding process which carries out the fixed connection in the watertight state with the bolt 57 for the fixed connection which removed and replaced | exchanged the said positioning bolt 61 is shown.

[8] FIG. 14 shows that after the valve case connecting step is completed, the valve mounting work case 55 is removed from the connecting flange 5G of the work on / off valve 5, and the work on / off valve 5 is split into the split T-shaped tube 4. The process of removing from 4C of connection flanges is shown.

  In addition, as a lining pipe | tube in which the resin lining layer 1 is formed in the internal peripheral surface of the water pipe 2, the flexible resin by which the adhesive agent was previously apply | coated to the inner peripheral surface side in the water pipe 2, for example. A sealing hose made of (polyethylene resin or the like) is fed while being reversed by air pressure, and the sealing hose is sequentially adhered to the inner peripheral surface of the water pipe 2 to form a resin lining layer 1 or a water pipe 2 After inserting a lining resin pipe such as a polyethylene pipe having a slightly smaller diameter than this inside, cement milk between the outer peripheral surface of the resin lining layer 1 constituted by this lining resin pipe and the inner peripheral surface of the water pipe 2 A lining pipe that has been press-fitted into a three-layer structure, or a lining resin (such as a two-component mixed epoxy resin) from one opening of the water pipe 2 is moved through a high-speed air flow or pipe Lining tube or the like is present on the inner circumferential surface of the water pipe 2 is formed with a resin lining layer 1 of a predetermined thickness while conveying in grayed like.

[Second Embodiment]
In the above-described first embodiment, the membrane cutting jig B1 and the membrane recovery jig B2 of the membrane cutting apparatus B are configured separately. However, as shown in FIG. The tool B2 may be combined.

  Specifically, the resin lining film 1a is provided in the bearing 65 provided at the lid center position passing through the hole axis Y of the through hole 3 in the canopy 11A of the film cutting work case 11 with a margin from the outside of the case. An operation shaft 66 having a length capable of holding and cutting the shaft is slidably supported in the direction of the hole axis Y of the through hole 3 and rotatably supported around the hole axis Y of the through hole 3. In addition, the male thread portion 66a formed at the lower end of the operation shaft 66 is provided with a pair of film locking claws 27A that can be locked to the lower surface of the resin lining film 1a while penetrating the resin lining film 1a. The film holder 27 is screwed and fixed.

  A cutting support arm 67 protruding along the radial direction of the through hole 3 is mounted on the lower portion of the operation shaft 66 in a state where the mounting position can be changed along the axial direction of the operation shaft 66. The cutting support arm 67 is cut along or substantially along the rotational cutting movement locus in contact with the cutting tip of the hole saw 45 in the resin lining film 1a facing the through hole 3 in the resin lining layer 1 of the water pipe 2. The cutting drive unit 70 having a waterproof structure including the rotary cutter 68 and the electric motor 69 that drives the rotary cutter 68 is attached to the cutting support arm 67 in the longitudinal direction corresponding to the plurality of apertures of the through hole 3. Equipped with changeable status.

  The membrane cutting jig B1 and the membrane recovery jig B2 share a single operation shaft 66, and the membrane cutting jig B1 includes a cutting support arm 67 and a cutting drive unit 70. The membrane recovery jig B2 is composed of a membrane holder 27 provided with a membrane locking claw 27A.

  The rotational movement of the cutting drive unit 70 and the feeding to the resin lining layer 1 are configured to be performed artificially by the rotational operation and sliding operation of the operation shaft 66 with respect to the bearing portion 65 of the film cutting work case 11. Yes.

  The other configurations are the same as or substantially the same as the configurations described in the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment. Omitted.

  In the second embodiment, the rotational movement of the cutting drive unit 70 and the feeding to the resin lining layer 1 are performed manually. However, the rotational movement of the cutting drive unit 70 and the resin lining layer 1 are performed. The feeding may be performed by mechanical force using an actuator.

  Further, in the second embodiment, the rotary cutter 68 that is driven and rotated is used as the cutting tool, but an electric saw that is reciprocated in the vertical direction may be used.

[Other Embodiments]
(1) In each of the above-described embodiments, the through-hole 3 serving as a valve body mounting hole for newly installing the gate valve D is formed in the pipe wall 2A of the water pipe 2, but the through-hole 3 is formed of the gate valve D. It may be a valve body mounting hole for newly installing a fluid device other than the above, and may further be a branch hole for newly installing a branch pipe.

  (2) Although the cutting operation shaft 13 of the membrane cutting jig B1 is provided at the lid center position passing through the hole axis Y of the through hole 3 in the canopy 11A of the membrane cutting work case 11, the cutting operation shaft 13 is provided. You may arrange | position in the vicinity of the hole axis Y of the through-hole 3.

  (3) In the first embodiment described above, the membrane recovery treatment is applied to the first bearing portion 12 provided at the lid center position passing through the hole axis Y of the through hole 3 in the canopy 11A of the membrane cutting work case 11. The recovery operation shaft 26 of the tool B2 is penetrated and supported, and the cutting operation shaft 13 of the membrane cutting jig B1 is mounted on the second bearing portion 25 provided at a portion biased radially outward from the first bearing portion 12. May be supported through.

  (4) In the first embodiment described above, the split T-shaped pipe 4 of the housing H that is externally fixed in a watertight state to the through-hole forming portion of the water pipe 2 is divided from the divided joint body 4A that is divided into three in the pipe circumferential direction. Although it comprised, it may change to this and may comprise from the division | segmentation coupling body divided | segmented into 2 or 4 in the pipe | tube circumferential direction.

  The present invention provides a through-hole forming method capable of efficiently and reliably performing the formation of a through-hole in a continuous flow state with respect to the lining pipe while suppressing the peeling of the resin lining layer on the pipe inner peripheral surface side continuous to the periphery of the through-hole. And it can be satisfactorily used as a membrane cutting device for a lining pipe used therefor.

A punching device B membrane cutting device B1 membrane cutting jig B2 membrane recovery jig H housing Y hole axis 1 resin lining layer 1a resin lining membrane 2 fluid pipe (water pipe)
2A pipe wall 2a cutting wall piece 3 through hole 5 work on-off valve 11 membrane cutting work case 13 cutting operation shaft 26 recovery operation shaft 38 working window 45 punching tool (hole saw)

Claims (6)

A through-hole forming method for a lining pipe, wherein a through-hole is formed in a pipe wall of a fluid pipe in which a resin lining layer is formed on an inner peripheral surface while maintaining a fluid flow in the fluid pipe,
A housing mounting step of mounting a housing provided with a work on / off valve in a state in which the through hole forming work area of the fluid pipe is sealed in the fluid pipe;
A drilling operation step of forming a through hole in a pipe wall of a fluid pipe with a drilling tool of a drilling device connected to the housing, and then removing the drilling device provided with the cutting wall piece from the housing;
Membrane cutting that attaches to the housing a membrane cutting device capable of cutting the resin lining film of the resin lining layer facing the through hole of the tube wall, and cuts and separates the resin lining film substantially along the inner peripheral edge of the through hole A method for forming a through-hole in a lining pipe, comprising:   The said membrane cutting operation process WHEREIN: The said resin lining film | membrane is cut | disconnected and separated along the inner periphery of the said through-hole in the state which hold | maintained the said resin lining film | membrane retrievably using the said membrane cutting device. A method for forming a through hole in a lining pipe.   3. The membrane cutting device used in the method for forming a through-hole of a lining pipe according to claim 1, wherein a membrane cutting jig capable of cutting and separating the resin lining film substantially along an inner peripheral edge of the through-hole; A membrane cutting device for a lining pipe, comprising: a membrane recovery jig that holds the resin lining membrane in a recoverable state.   The cutting operation shaft of the membrane cutting jig is slidable in the axial direction of the through hole with respect to the membrane cutting work case connected to the housing, and swings in the radial direction of the through hole. While being pierced and supported operably, the recovery operation shaft of the membrane recovery jig is pierced and supported so as to be slidable in the axial direction of the through hole at least with respect to the membrane cutting work case. The membrane cutting device for a lining pipe according to claim 3.   The membrane cutting device for a lining pipe according to claim 4, wherein a cutting operation axis of the membrane cutting jig is arranged on or near the hole axis of the through hole in the membrane cutting work case.   The membrane cutting device for a lining pipe according to claim 4 or 5, wherein the membrane cutting work case is provided with a plurality of work windows.

Images