JP6934671B2 - Valve installation device and valve installation method - Google Patents

Description

The present invention is a valve installation device that cuts and removes a part of an existing pipe in a sealed space and installs a sluice valve at the removed portion of the existing pipe, and a valve that installs a sluice valve at the cut portion of the existing pipe. Regarding the installation method.

As a technique related to the above-mentioned valve installation device and valve installation method, Patent Document 1 describes cutting an existing pipe with a cutting device inside a housing having a sealed structure surrounding the existing pipe, and using the cutting device and the cut existing pipe. Is taken out from the upper part of the housing, and then a sluice valve is sent from the upper part of the housing to the cutting removal pipe portion to fix the sluice valve to the existing pipe.

In Patent Document 1, the cutting device includes a guide disk provided on the outer circumference of the existing pipe and a rotary blade that is rotationally driven along the guide disk, and the rotary blade is driven by an electric motor outside the housing. The existing pipe is cut by driving. In addition, the sluice valve is provided with a pair of replacement pipes along the existing pipe (cutting residual pipe), and when the sluice valve is installed, the seal flange member is externally fitted to the replacement pipe. It is supported in advance by.

After installing the sluice valve, the seal flange member is moved to the boundary position between the existing pipe (cutting residual pipe portion) and the replacement pipe portion by the feeder mechanism. As a result, the seal flange member is arranged at a position covering the outer periphery of the existing pipe (cutting residual pipe portion) and the replacement pipe portion, and water leakage from the cut portion is suppressed.

Further, on the inner circumference of the seal flange member, a seal ring is provided at a position in contact with the outer circumference of the existing pipe and a position in contact with the outer circumference of the replacement pipe portion. Then, after the sluice valve is installed in this way, the housing is removed.

Japanese Unexamined Patent Publication No. 09-79430

At the time of construction of the technique for installing the sluice valve by the method described in Patent Document 1, for example, a seal flange member having a cylindrical shape by adhering two semicircular members was assembled at the site.

However, when the seal flange member is assembled on site, there is a problem in durability, and moreover, the water stoppage test becomes difficult and there is room for improvement.

For this reason, a valve installation device and a valve installation method that have high durability and can satisfactorily suppress fluid leakage after a part of the existing pipe is cut and removed and a sluice valve is installed are required.

The characteristic configuration of the valve installation device according to the present invention is a sealed housing for accommodating an existing pipe, a cutting mechanism for cutting the existing pipe inside the housing, and a cutting mechanism for cutting the existing pipe. A sluice valve capable of opening and closing a flow path between a pair of remaining pipes left inside the housing after cutting and removing a part of the existing pipe to the outside of the housing is provided. The joint wheel is moved to a position that covers the boundary between the replacement mechanism inserted from the outside of the housing, the flow path pipe that protrudes outward from the valve body of the sluice valve inserted by the replacement mechanism, and the remaining pipe portion. It is provided with a shift mechanism for causing the joint wheel to be operated, and the joint wheel is configured as an integral body formed into a tubular shape.

According to this characteristic configuration, the existing pipe is cut by the cutting mechanism inside the housing, the cut existing pipe is removed, and the sluice valve is inserted into the removed portion by the replacement mechanism. In this inserted state, the joint wheel is moved to a position that covers the boundary between the flow path pipe of the sluice valve and the remaining pipe portion by the shift mechanism, so that the joint wheel can be moved from the boundary portion between the flow path pipe and the remaining pipe portion. Leakage of fluid can be suppressed.

In particular, since the joint ring is an integral body formed into a cylindrical shape, it has higher durability than, for example, two semicircular members bonded together or connected with bolts or the like to form a tubular shape. It is also possible to perform a water stoppage test before construction.
In this way, after cutting and removing a part of the existing pipe and installing the sluice valve, a valve installation device having high durability and capable of satisfactorily suppressing fluid leakage was constructed.

As another configuration, in order to cut the existing pipe, the cutting mechanism has a cutting blade portion that can be driven and rotated around the tube axis of the existing pipe, and is supported inside the housing to cut the cutting mechanism. However, in a state where the cutting blade portion is retracted to a position away from the outer periphery of the existing pipe, a space allowing the movement of the joint wheel may be formed on the outer periphery of the remaining pipe portion.

According to this, the existing pipe can be cut by driving and rotating the cutting blade of the cutting mechanism around the pipe axis, and after cutting the existing pipe, the cutting blade is retracted to a position separated from the outer periphery of the remaining pipe portion. By doing so, even when the joint wheel is moved by the shift mechanism, this movement is not hindered by the cutting mechanism.

As another configuration, the shift mechanism includes an engaging member in which the joint wheel is formed with a through hole in a posture of protruding outward from the outer surface of the joint wheel and in a posture along the pipe axis of the existing pipe. However, the shift rod is provided with a shift rod that is inserted into the through hole and a regulating member that projects outward from the through hole when the tip of the shift rod is inserted into the through hole. A shift drive unit that moves the shift rod in a direction away from the valve body of the sluice valve may be provided with the rod inserted into the through hole of the engaging member.

According to this, by inserting the tip of the shift rod into the through hole of the engaging member, the regulating member reaches the posture of projecting to the outside of the through hole. In this state, by moving the shift rod in the direction away from the valve body of the sluice valve by the shift mechanism, the joint wheel can be moved integrally with the engaging member. That is, in this configuration, a mechanism for connecting the tip portion of the shift rod to the engaging member is not required, and a screw type structure can be adopted as the mechanism for operating the shift rod, so that the configuration can be simplified.

As another configuration, the cutting mechanism includes a groove forming blade portion that forms a fitting groove on the outer periphery of a portion of the existing pipe that becomes the remaining pipe portion when cutting the existing pipe, and the joint is provided. A fitting member may be provided in which the ring is fitted into the fitting groove to determine the position of the joint ring.

According to this, by moving the joint wheel to a position covering the boundary between the remaining pipe portion and the flow path pipe by the shift mechanism, the engaging member engages in the fitting groove formed on the outer periphery of the remaining pipe portion. Therefore, the joint wheel can be held in the optimum position. Moreover, since the cutting mechanism is provided with a groove forming blade, work efficiency can be improved.

As another configuration, a joining rod for fixing the relative position between the joint wheel and the sluice valve while the joint wheel is arranged at a position covering the boundary between the remaining pipe portion and the existing pipe. It may be provided between the joint wheel and the sluice valve.

According to this, the position of the joint wheel is fixed by providing the joint wheel between the joint wheel and the sluice valve by a joining rod in a state where the joint wheel is arranged at a position covering the boundary between the remaining pipe portion and the existing pipe. It becomes possible.

The characteristic configuration of the valve installation method according to the present invention is a step of arranging a sealed housing at a position for accommodating an existing pipe inside, and cutting a part of the existing pipe inside the housing by a cutting mechanism. A step of taking out the existing pipe to the outside of the housing, a step of inserting a sluice valve from the outside of the housing between a pair of remaining pipes left inside the housing after a part of the existing pipe is cut and taken out. Of the sluice valves, a joint ring formed as an integral body formed into a tubular shape is preliminarily attached to a flow path pipe protruding outward from the valve body, and the sluice valve is a pair of remaining pipe portions. The point is that the joint wheel is moved to a position that covers the boundary between the remaining pipe portion and the flow path pipe in a state of being inserted at the intermediate position of the above.

According to this characteristic configuration, a part of the existing pipe is cut by a cutting mechanism inside the housing on the sealed side, and after this cutting, a sluice valve is installed between the pair of remaining pipe portions. With the sluice valve installed in this way, the joint ring that is preliminarily fitted to the flow path pipe of the sluice valve is moved to a position that covers the boundary between the remaining pipe portion and the flow path pipe, thereby causing a flow. Leakage of fluid from the boundary between the road pipe and the existing pipe can be suppressed.

In particular, since the joint ring is an integral body formed into a cylindrical shape, it has higher durability than, for example, two semicircular members bonded together or connected with bolts or the like to form a tubular shape. It is also possible to perform a water stoppage test before construction.
In this way, a valve installation method has been constructed in which a part of the existing pipe is cut and removed, and after the sluice valve is installed, the valve installation method is highly durable and can satisfactorily suppress fluid leakage.

It is a side view which shows the whole of a valve installation device. It is sectional drawing which shows the cutting mechanism at the time of cutting. It is sectional drawing of the state which removed the cut part from the cut existing pipe. It is sectional drawing of the state which installed the sluice valve in the excision area. It is sectional drawing of the state in which the joint wheel is shifted to the boundary between the remaining pipe part and the flow path pipe by the shift mechanism. It is a side view of the state where the sluice valve is fixed between the remaining pipes. It is sectional drawing which shows the structure of the cutting operation part, and the cutting blade in the position before cutting. It is sectional drawing which shows the structure of the cutting operation part, and the cutting blade at the time of cutting. It is sectional drawing which shows the structure of the star foil of a cutting operation part, and the contact member. It is sectional drawing which shows the state which the actuating member was displaced by contact with a star foil and a contact member. FIG. 4 is a cross-sectional view taken along the line XI-XI of FIG. It is sectional drawing which shows the positional relationship between a shift rod and an engaging member. It is sectional drawing of the state in which the joint wheel is shifted by the shift rod. It is sectional drawing of the state in which the joint ring is fixed by the joining rod. It is sectional drawing of the state in which the joint ring is fixed by the joining rod, and the fitting ring is fitted in the fitting groove. It is sectional drawing which shows the arrangement of the diameter expansion jig. It is sectional drawing which shows the change of the inner diameter of the fitting ring by the diameter-expanding jig. It is sectional drawing which shows the fitting ring when the diameter expansion jig is removed. It is sectional drawing of the state immediately before performing the shift of the joint wheel of another embodiment (a). It is sectional drawing in the state of shifting the joint wheel of another embodiment (a). Another embodiment (a) is a cross-sectional view showing a locking projection and a stopper. It is sectional drawing which shows the state in which the locking projection of another embodiment (a) and the stopper overlap each other. It is sectional drawing which shows the center frame, the rotating disk, and a joint wheel of another embodiment (b, c). FIG. 5 is a cross-sectional view of a state in which a sluice valve is fixed between the remaining pipe portions in another embodiment (b, c).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
As shown in FIGS. 1 to 5, a housing 10 that forms a sealed space on the outer periphery of the existing pipe 1, a pair of cutting mechanisms 20 that cut the existing pipe 1 inside the housing 10, and a pair of existing pipes 1. A part cut by the cutting mechanism 20 of the above is taken out to the outside, and a replacement mechanism 30 for inserting the sluice valve V is provided, and the sluice valve V is inserted into the cutting area R in which a part of the existing pipe 1 is cut. The valve installation device S is provided with a shift mechanism 40 for moving the joint wheel 55 (see FIGS. 4 and 5) to the boundary between the remaining pipe portion 1a and the flow path pipe 54 in this state.

This valve installation device S assumes a water pipe as the existing pipe 1, and does not block water as a fluid flowing through the existing pipe 1 (while maintaining the state in which water flows), and determines the existing pipe 1. A sluice valve V that can block the flow of water is installed in the cut area R by cutting the position of.

In order to realize this construction, as shown in FIG. 1, a pit 2 for exposing the existing pipe 1 is formed on the ground by excavation. The sluice valve V can be installed by providing the housing 10 in the existing pipe 1 exposed inside the pit 2.

In this construction, as shown in FIG. 2, the region where the existing pipe 1 is cut by the pair of cutting mechanisms 20 is referred to as a cutting region R, and the region of the existing pipe 1 adjacent to the cutting region R is the remaining pipe portion. It is called 1a. Further, after the sluice valve V is arranged between the pair of remaining pipe portions 1a by this construction, the sluice valve V is fixed between the pair of remaining pipe portions 1a as shown in FIG.

〔housing〕
As shown in FIG. 1, the housing 10 includes a lower case 11 arranged on the lower side of the existing pipe 1, an upper case 12 arranged on the upper side of the existing pipe 1, a shutter case 13, and a work case 14. It is configured by stacking it on top of each other and connecting it.

The housing 10 has a structure that creates a sealed space in the area extending from the lower case 11 to the work case 14, and by setting the plate-shaped shutter 13a inside the shutter case 13 in the closed position, the work case 14 It is configured so that the flow of water (fluid) between the internal space of the work case 14 and the space below the work case 14 can be blocked.

As shown in FIGS. 1 to 5, the lower case 11 includes a lower case body 11a arranged along the outside of the existing pipe 1 so as to cover the lower side of the existing pipe 1, and a pipe axis P of the existing pipe 1. It has a pair of lower vertical walls 11b arranged at both ends of the lower case main body 11a in a vertical posture orthogonal to the above.

A support base 15 is provided on the inner surface of the bottom of the lower case body 11a. A semicircular hole-shaped portion that embraces the lower side of the existing pipe 1 is formed on the pair of lower vertical walls 11b, and a long sealing member with respect to the outer circumference of the existing pipe 1 is formed outside the hole-shaped portion. 16 is wound and fixed in an annular shape by adhesion.

The upper case 12 has an upper case main body 12a arranged along the outside of the existing pipe 1 so as to cover the upper side of the existing pipe 1 and an upper case main body 12a in a vertical posture orthogonal to the pipe axis P of the existing pipe 1. It has a pair of upper vertical walls 12b arranged at both ends of the upper case body, and a tubular intermediate case portion 12c extending upward from the center of the upper case main body 12a.

The upper vertical wall 12b is formed with a semicircular hole-shaped portion that embraces the lower side of the existing pipe 1. The seal member 16 described above is arranged outside the hole-shaped portion. In this way, the seal member 16 is formed on the entire circumference of the outer circumference of the existing pipe 1 to prevent water leakage from the entire circumference.

As shown in FIG. 1, an upper flange portion 11f and a lower flange portion 12f are arranged along a mating surface between the lower case main body 11a of the lower case 11 and the upper case main body 12a of the upper case 12, and these are bolts. Are connected by.

The shutter case 13 is connected to the upper end of the intermediate case portion 12c of the upper case 12 and the lower end of the work case 14. A plate-shaped shutter 13a is arranged inside the shutter case 13 so as to be movable in the horizontal direction, and a handle 13b for operating the shutter 13a is provided outside the shutter case 13.

The work case 14 is arranged at a position where the intermediate case portion 12c is extended upward, an insertion / removal opening 14a is formed on the side portion, and a wall body 14b for opening / closing the insertion / removal opening 14a is detachably attached. It is equipped.

[Cut mechanism]
As shown in FIGS. 2 and 3, the cutting mechanism 20 includes a pair of rotating discs 21 rotatably centered on the existing pipe 1 at the bottom of the housing 10. That is, the pair of rotating discs 21 are arranged at positions that sandwich the area to be cut in the direction along the tube axis P, and the respective rotating discs 21 are the lower vertical wall 11b and the upper vertical wall at adjacent positions. It is rotatably supported by a stay or the like projecting from 12b. The rotating disc 21 is formed in the shape of a disc having a sprocket formed on the outer periphery by arranging the half-split disc at a position surrounding the existing pipe 1 and connecting the rotary disc 21 with a bolt or the like.

As shown in FIGS. 2, 3 and 7 to 10, each of the rotating discs 21 is configured as a sprocket wheel having a large number of teeth on the outer periphery, and each of the rotating discs 21 has a guide frame 22. It has. A tool holder 23 is provided on the guide frame 22 so as to be slidable in the radial direction of the existing pipe 1. The tool holder 23 includes a cutting blade 24 made of a cutting tool (an example of a cutting blade portion) and a groove made of a cutting tool. It is provided with a cutting blade 25 (an example of a groove forming blade portion).

A chamfering blade 24a is integrally formed at the base end portion of the cutting blade 24, and when the cutting blade 24 cuts the existing pipe 1, the chamfering blade 24a removes the outer peripheral edge of the cutting surface of the existing pipe 1. The cutting is done as follows. Further, the groove cutting blade 25 forms a fitting groove 1G (see FIGS. 3 and 4) on the outer periphery outside the cut surface of the existing pipe 1.

As shown in FIGS. 7 to 10, each rotating disc 21 is provided with a cutting operation portion 26 that operates the bite holder 23 in the radial direction of the existing pipe 1. The cutting operation portion 26 includes a shift shaft 26a in a posture along the radial direction of the existing pipe 1 and a drive shaft 26b in a posture parallel to the pipe shaft core P in a positional relationship different from the shift shaft 26a. A male screw is formed on the shift shaft 26a, and a female screw portion of the bite holder 23 is screwed into the male screw.

The drive shaft 26b is provided with a worm gear 26bg, and the shift shaft 26a is provided with a wheel gear 26ag that meshes with the worm gear 26bg. Further, a star wheel 26s is provided at the end of the drive shaft 26b, and a contact member 26t that abuts on the tooth portion of the star wheel 26s is provided on the inner surface of the upper vertical wall 12b.

As shown in FIGS. 2 to 5, an electric cutting motor 27 is provided on the outer surface of the pair of upper vertical walls 12b, the drive sprocket 27a driven by the cutting motor 27, and the sprocket on the outer periphery of the rotating disk 21. The chain 27b is wound around the portion.

By configuring the cutting mechanism 20 in this way, the rotating disc 21 is rotated by driving the cutting motor 27 in the forward rotation direction, and the contact member 26t hits the tooth portion of the star wheel 26s with this rotation. The drive shaft 26b is rotated each time it comes into contact with it. The rotation of the drive shaft 26b is transmitted from the worm gear 26bg to the wheel gear 26ag to rotate the shift shaft 26a. By this rotation, as shown in FIG. 8, the cutting blade 24 and the grooving blade 25 are brought close to the existing pipe 1 together with the tool holder 23, and the existing pipe 1 is cut.

In this cutting mechanism 20, the rotating discs 21 are arranged at positions separated by a set distance in the direction along the pipe axis P, and each rotating disc 21 is provided with a cutting blade 24, so that the existing pipe 1 is cut at a cutting distance L. The cutting is performed so that only the cutting is performed. Further, at the time of cutting, the outer peripheral portion of the cut surface of the existing pipe 1 (remaining pipe portion 1a) is chamfered, and the fitting groove 1G is formed outside the cut surface.

In particular, in this cutting mechanism 20, after the existing pipe 1 is cut, the cutting motor 27 is reversed to separate the cutting blade 24 and the grooving blade 25 from the outer surface of the existing pipe 1 as shown in FIG. Can be evacuated to the position.

[Exchange mechanism]
The replacement mechanism 30 has an elevating shaft 31 arranged in a region extending from the work case 14 of the housing 10 to the inside of the upper case 12, and surrounds a portion of the existing pipe 1 to be cut out, as shown in FIG. A belt-shaped restraint body 32 is provided, and the leg portion 33 extending downward from the restraint body 32 is brought into contact with the support base 15 on the inner surface of the bottom of the lower case 11, so that the portion to be cut out even at the time of cutting is formed. The position is stable.

From this configuration, after the existing pipe 1 is cut by the cutting mechanism 20, the elevating shaft 31 is pulled up by an external driving force or the like, and as shown in FIG. 3, the cut portion of the existing pipe 1 is used as the work case 14. Move to the inside of. Next, the shutter 13a of the shutter case 13 is closed.

After closing the shutter 13a of the shutter case 13 in this way, the existing pipe 1 cut together with the work case 14 is removed. After that, the sluice valve V is set inside the work case 14, connected to the upper surface of the shutter case 13, and the elevating shaft 31 is lowered in the reverse procedure to insert the sluice valve V.

As shown in FIGS. 4 and 5, a protruding body 34 for positioning that protrudes downward is provided on the lower surface side of the sluice valve V. Further, when the sluice valve V is inserted into the cutting region R of the existing pipe 1, the shutter 13a is opened in the shutter case 13 and the elevating shaft 31 is lowered to the inside of the lower case 11 by a driving force from the outside or the like. By supporting the projecting body 34 on the support base 15, the position of the sluice valve V is determined.

The housing 10 is provided with a confirmation window in which a transparent plate such as glass is fitted so that the exchange by the exchange mechanism 30 can be visually confirmed.

[Sluice valve]
As shown in FIGS. 4 and 5, the sluice valve V includes a valve body 51 that houses a valve body that enables opening and closing of a flow path, an upper protruding portion 52 that projects upward from the valve body 51, and a valve body. Of the 51, the main body flange 53 at the outer end of the flow path portion for sending water (fluid) in the direction along the existing pipe 1 is provided with the flow path pipe 54 connected by the flow path flange 54a. In particular, the joint ring 55 is slidably mounted on the flow path pipe 54 along the extending direction of the flow path pipe 54.

The joint ring 55 is configured as an integral body formed into a cylindrical shape, and as shown in FIG. 12, annular grooves are formed on the inner circumference at predetermined intervals in the direction along the pipe axis P, and each of them has an annular groove. An annular seal ring 56 made of rubber is fitted into the annular groove of the above. Further, an annular holding groove is formed at the outer end of the inner circumference of the joint ring 55, and a metal fitting ring 57 (an example of a fitting member) is fitted into the holding groove. The fitting ring 57 is not a perfect ring, but a slit along the radial direction is partially formed in the fitting ring 57.

Since the diameter of the fitting ring 57 is set so as to fit into the fitting groove 1G in a natural state, the diameter of the fitting ring 57 is expanded from the outer end side of the joint ring 55 as shown in FIGS. 11, 16 and 17. By inserting the tool 57a, the inner diameter is forcibly expanded and held. Further, by removing the diameter-expanding jig 57a, as shown in FIG. 18, the fitting ring 57 can be shifted to the state of being fitted in the fitting groove 1G.

That is, the diameter-expanding jig 57a expands the inner diameter of the fitting ring 57, and maintains a state in which the inner circumference of the fitting ring 57 is not brought into contact with the outer circumference of the flow path pipe 54. As a result, when the joint wheel 55 is shifted by the shift mechanism 40 as described later, the load caused by the fitting ring 57 coming into contact with the outer periphery of the flow path pipe 54 is reduced, and the fitting ring 57 is erroneously used. This prevents the inconvenience of being fitted into the boundary portion between the remaining pipe portion 1a and the flow path pipe 54.

As shown in FIGS. 11 and 12, a plurality of (three places in this embodiment) engaging projections 55a are formed on the outer end side of the outer circumference of the joint wheel 55, and a flange body is formed on the inner end side of the outer circumference of the joint wheel 55. It forms 55b. Each of the engaging protrusions 55a is provided with an engaging member 58 which is in a posture of projecting outward from the outer surface of the joint wheel 55, and a position of each engaging member 58 which is separated from the outer surface of the joint wheel 55. A through hole 58a is formed in a posture parallel to the tube axis P.

In particular, when the sluice valve V is inserted into the cutting region R, the position of the outer end of the joint ring 55 is held inside the outer end of the flow path pipe 54 (the side of the sluice valve V close to the valve body 51).

[Shift mechanism]
As shown in FIGS. 4, 5 and 11 to 13, the shift mechanism 40 is a male screw screwed into a nut portion 41 formed on the lower vertical wall 11b and the upper vertical wall 12b of the housing 10. A plurality of (three in this embodiment) shift rods 42 having portions formed therein, and a rotary drive unit 43 having an electric motor or the like so as to simultaneously drive and rotate the plurality of shift rods 42 in the same direction are provided. There is.

The plurality of shift rods 42 are arranged at positions that can be inserted into the through holes 58a of the plurality of engaging members 58. Further, the tip of the shift rod 42 (the end facing the inside of the housing 10) is provided with a regulating member 42b that can freely switch the posture while being fitted in the slit.

The regulating member 42b is swingably supported by a protruding posture that projects outward from the swinging shaft 42a in a posture orthogonal to the axis of the shift rod 42 and a retracted posture along the outer surface of the shift rod 42. At the same time, it is urged to project outward by the urging force of the urging member such as a rubber material or a spring material. From this configuration, when the shift rod 42 is inserted into the through hole 58a of the engaging member 58, it is in the retracted posture shown in FIG. 12, and after passing through the through hole 58a, it is switched to the protruding posture shown in FIG.

Further, after reaching the protruding posture, when the shift rod 42 shifts outward, the shift force is applied from the engaging member 58 to the joint wheel 55 outward by maintaining the protruding posture. Is possible.

After the joint wheel 55 is shifted to a position that covers the boundary between the remaining pipe portion 1a and the flow path pipe 54 by the operation of the shift mechanism 40 in this way, the housing 10 is removed and the diameter expansion jig 57a is artificially used. By removing the fitting ring 57 into the fitting groove 1G as shown in FIGS. 15 and 18, the joint ring 55 is fixed by the joining rod 60 as shown in FIGS. 14 and 15. Become. Either the fitting of the fitting ring 57 and the fixing by the joining rod 60 may be performed first.

[Valve installation method]
Since the valve installation device S is configured in this way, the pit excavation process (01), the housing arrangement process (02), the excision process (03), the valve insertion process (04), the joint wheel shift process (05), A sluice valve V can be installed in the existing pipe 1 by a valve installation method in which each step of the housing removal step (06) is executed in this order.

In the pit excavation step (01), as shown in FIG. 1, the pit 2 is formed in a state where the existing pipe 1 is exposed by excavating the ground. The base 2a is formed at the bottom of the pit 2 by concrete, and a pair of fixing walls 2b for fixing the existing pipe 1 are formed so as to rise from the base 2a.

In the housing arrangement step (02), as shown in FIG. 2, the existing pipe 1 exposed in the middle of the pair of fixed walls 2b inside the pit 2 is in close contact with the outer periphery of the portion where the sluice valve V is installed. An operation is performed in which the restraint body 32 is provided, the elevating shaft 31 extends upward from the restraint body 32, and the legs 33 of the restraint body 32 are provided in advance.

Further, in the housing arranging step (02), the rotating disk 21, the guide frame 22, the tool holder 23, and the like of the cutting mechanism 20 are pre-arranged by assembling in the vicinity of the cutting portion in the existing pipe 1. Then, the lower case 11 and the upper case 12 of the housing 10 are arranged so as to support them internally, and these are integrated by connecting the upper flange portion 11f and the lower flange portion 12f.

In this integration, work such as arranging the chain 27b is performed so as to transmit the driving force of the cutting motor 27 that drives the cutting mechanism 20 to the rotating disc 21. Further, when integrated in this way, a long seal member 16 is wound around the outer circumference of the existing pipe 1 outside the pair of lower cases 11 and fixed by adhesion, so that water leakage at this portion is suppressed. ..

In the housing arrangement step (02), the shutter case 13 is connected to the upper end of the intermediate case portion 12c of the upper case 12, and the work case 14 is connected to the upper end. The elevating shaft 31 is exposed upward from the upper end of the work case 14, and the housing 10 is completed.

In the cutting step (03), the existing pipe 1 is cut by rotationally driving the pair of cutting mechanisms 20 to rotate the corresponding cutting motors 27 in a predetermined direction. As described above, in this cutting, as shown in FIG. 8, the existing pipe 1 is cut by the cutting blade 24, and at the same time, the chamfering blade 24a removes the outer peripheral edge of the cut surface. Further, at the time of this cutting, the groove cutting blade 25 forms a fitting groove 1G on the outer periphery outside the cutting surface of the portion of the existing pipe 1 that becomes the remaining pipe portion 1a.

After the existing pipe 1 is cut, the cutting motor 27 is reversed so that the cutting blade 24 and the grooving blade 25 are retracted from the outer periphery of the existing pipe 1 as shown in FIG. , A space for enabling the shift of the joint wheel 55 is formed on the outer periphery of the remaining pipe portion 1a.

Further, in this cutting step (03), the cut portion of the existing pipe 1 is moved to the inside of the work case 14 by the operation of pulling up the elevating shaft 31 (a part of the configuration of the replacement mechanism 30), and the shutter case 13 is used. Shutter 13a is closed. As a result, the water flow from the excision region R of the existing pipe 1 to the work case 14 is blocked.

In the valve insertion step (04), as shown in FIG. 4, the shutter 13a of the shutter case 13 is opened, the elevating shaft 31 is lowered, and the sluice valve V is inserted into the cutting region R.

When the sluice valve V is inserted into the cutting region R in this way, the sluice valve V can be arranged at an appropriate position by receiving the leg portion 33 on the lower surface side of the sluice valve V by the support base 15.

In this valve insertion step (04), a leg 33 is provided on the lower surface side of the sluice valve V before the sluice valve V is supported at the lower end of the elevating shaft 31, and is joined to each of the pair of flow path pipes 54. The ring 55 is exteriorized. A pair of seal rings 56 and a single fitting ring 57 are provided on the inner circumference of the joint ring 55. As described above, the fitting ring 57 is maintained in a state in which the inner diameter is forcibly expanded by the diameter expanding jig 57a.

In the joint wheel shift step (05), a plurality of shift rods 42 are simultaneously rotated in the same direction by driving the rotation drive unit 43, so that each shift rod 42 is rotated in the same direction as shown in FIGS. The tip of the sluice valve V is operated in a direction approaching the sluice valve V, and the tip thereof is inserted into the through hole 58a of the engaging member 58. During the insertion in this way, the regulating member 42b swings to the retracted posture, and after the insertion, the regulating member 42b switches to the protruding posture shown in FIGS. 5 and 13.

In this joint wheel shift step (05), the rotary drive unit 43 is reversed to operate the shift rod 42 in a direction away from the sluice valve V, and the joint wheel 55 is outward (partitioned) together with the plurality of engaging members 58. Shift in the direction away from the valve V). As a result of this shift, the joint ring 55 shifts to a position that covers the boundary between the remaining pipe portion 1a and the flow path pipe 54, and the fitting ring 57 reaches a position where it can engage with the fitting groove 1G. 50) is completed.

When the shift step (50) is completed in this way, one of the pair of seal rings 56 of the joint ring 55 is in close contact with the outer circumference of the flow path pipe 54, and the other is in close contact with the outer circumference of the remaining pipe portion 1a. The state of water leakage from the boundary between the remaining pipe portion 1a and the flow path pipe 54 is prevented.

Next, the housing 10 is disassembled and removed by the housing removing step (06). In the state of being removed in this way, as shown in FIGS. 14 and 15, the fitting ring 57 is fitted into the fitting groove 1G by removing the diameter-expanding jig 57a provided in the fitting ring 57, and the joint ring 55. Regulate the movement of. Further, the flange body 55b of the joint ring 55 and the flow path flange 54a of the flow path pipe 54 are connected by a plurality of joining rods 60.

A male screw portion is formed over the entire length of the joint rod 60, and the inner end side (the side closer to the sluice valve V) of the joint rod 60 is screwed into the female screw hole of the flow path flange 54a with a fixing nut 61. It is fixed, and the outer end side is inserted into the hole of the flange body 55b and fixed by being sandwiched between a pair of fixing nuts 61.

When all the steps are completed in this way, as shown in FIG. 6, the sluice valve V is arranged between the two remaining pipe portions 1a exposed inside the pit 2. In this arrangement state, since the joint ring 55 is arranged at a position covering the boundary portion between the flow path pipe 54 of the sluice valve V and the remaining pipe portion 1a, the sluice valve V is in a state of preventing water leakage from the remaining pipe portion 1a. Supported by. Further, in the joint ring 55, the sluice valve V is firmly supported because the fitting ring 57 engages with the fitting groove 1G and the position is determined by the plurality of joining rods 60. In particular, since the joint wheel 55 is configured as an integral body formed into a cylindrical shape, support with high strength is realized.

[Another Embodiment]
The present invention may be configured as follows in addition to the above-described embodiment (those having the same functions as those in the embodiment are designated by the same numbers and reference numerals as those in the embodiment).

(A) Instead of the configuration in which the joint ring 55 is fixed by the joining rod 60, a stopper 54s is formed on the outer circumference of the flow path pipe 54 as shown in FIGS. 19 to 22, and a locking projection is formed on the inner circumference of the joint ring 55. A configuration is used in which 55s is formed and the positional relationship of the joint wheels 55 is maintained in a state where the joint wheels 55 are shifted to the positions shown in FIG. 20 by the shift mechanism 40.

In this other embodiment (a), as shown in FIG. 19, a stopper 54s protruding outward is formed on the outer periphery near the outer end of the flow path pipe 54, and a locking projection 55s is formed on the inner circumference of the joint ring 55. It is formed. Further, before the joint wheel 55 is shifted outward by the shift mechanism 40, as shown in FIG. 19, the seal ring 56 and the fitting ring 57 are arranged outside the outer end of the flow path pipe 54.

From such a configuration, in the joint wheel shift step (05), the joint wheel 55 is shifted outward by the shift mechanism 40, and the fitting ring 57 can be engaged with the fitting groove 1G as shown in FIG. Set in position. In this state, the stopper 54s and the locking projection 55s reach a positional relationship of contact with each other in the direction along the pipe axis P. After reaching this positional relationship, the position of the joint ring 55 is fixed by performing an operation of fitting the fitting ring 57 into the fitting groove 1G. Further, in this shift step (05), since the positions of the two joint wheels 55 at the positions sandwiching the sluice valve V are regulated at the same time by contact, the position of the sluice valve V fluctuates in the direction along the pipe axis P. There is no.

In this other embodiment (a), the stopper 54s and the locking projection 55s are formed in a gear shape as shown in FIG. 21, and the stopper 54s is engaged when the joint wheel 55 and the flow path pipe 54 slide relative to each other. A groove-shaped portion 55t that can abut or pass through the stop projection 55s is formed. This configuration is for preventing the joint ring 55 from falling off in a state where the joint wheel 55 is externally attached to the flow path pipe 54 as shown in FIG. That is, when the joint ring 55 is to be exteriorized on the flow path pipe 54, the joint ring 55 is set outside the flow path pipe 54, and the groove-shaped portion 55t is set as a stopper 54s while being displaced in the direction along the pipe axis P. The rotation angle of the joint wheel 55 is adjusted around the tube axis P so that Next, after the stopper 54s passes through the groove-shaped portion 55t and the joint ring 55 reaches the position shown in FIG. 19, the joint wheel 55 is rotated about the pipe axis P by a set angle. Due to this rotation, as shown in FIG. 22, the stopper 54s and the locking projection 55s overlap each other in the direction along the pipe axis P, and for example, the joint wheel 55 is displaced in the direction of coming out of the flow path pipe 54. Even if there is, the stopper 54s and the locking projection 55s come into contact with each other, and the joint wheel 55 can be prevented from falling off.

Further, as a different embodiment of the other embodiment (a), in FIGS. 21 and 22, the width of the stopper 54s in the circumferential direction and the width of the groove-shaped portion 55t in the circumferential direction are close to each other so that they can pass through. The widths of the adjacent stoppers 54s and the groove-shaped portion 55t in the circumferential direction are also the same, but the widths of the respective stoppers in the circumferential direction are changed so that the stopper 54s can pass through only one place in the circumferential direction. It may be set to (corresponding to the groove-shaped portion 55t described above). With this configuration, when the joint wheel 55 is rotated around the tube axis P, the stopper 54s can pass through the portion of the locking projection 55s at only one angle of 360 °. At an angle other than the angle, the joint wheel 55 cannot be displaced in the direction in which it comes out. For example, by rotating the joint wheel 55 by about 180 ° after passing through, the joint wheel 55 can be prevented from falling off more satisfactorily.

In another embodiment (a), the operation of fitting the fitting ring 57 into the fitting groove 1G is performed at any timing before or after the operation of rotating the joint wheel 55 around the pipe axis P. But it's okay.

(B) As shown in FIGS. 23 and 24, the center frame 70 is arranged at a portion corresponding to the region for cutting the existing pipe 1, and both sides of the center frame 70 are supported by the center frame 70 on both sides thereof. A cutting mechanism 20 is provided in the portion.

In this other embodiment (b) configuration, since the rotating disk 21 of the cutting mechanism 20 is arranged at a position sandwiching the center frame 70, a cutting motor 27 for driving these is provided inside the center frame 70 or from the outside. A drive structure for synchronously driving the rotating disk 21 by the driving force of the above is provided.

Also in this other embodiment (b), as in the embodiment, the rotating disk 21 is provided with a guide frame 22, a tool holder 23, a part of the cutting operation portion 26, and the like, and as the rotating disk 21 rotates, the bite is provided. The holder 23 is configured to be brought close to the existing pipe 1 to realize cutting of the existing pipe 1.

Due to such a configuration, after the existing pipe 1 is cut by the pair of cutting mechanisms 20, the replacement mechanism 30 lifts the cut portion of the existing pipe 1 upward together with the center frame 70 and the cutting mechanism 20. , Will be taken out of the housing 10. In this configuration, since the cutting mechanism 20 does not exist inside the housing 10 when the sluice valve V is inserted in the cutting region R, the shift mechanism 40 for shifting the joint wheel 55 can be simplified.

Further, by being configured as in the other embodiment (b), when the joint wheel 55 is shifted by the shift mechanism 40, the cutting blade 24 and the like of the cutting mechanism 20 are retracted in the direction away from the existing pipe 1. Is also unnecessary.

(C) As shown in FIGS. 23 and 24, the joint ring 55 is held in a state of being preliminarily exteriorized at a portion of the existing pipe 1 that is outside the portion to be excised (the portion that becomes the remaining pipe portion 1a). When a part of the existing pipe 1 is excised and the sluice valve V is arranged in the excision region R, the joint ring 55 is configured to be shifted so as to approach the sluice valve V from the outside.

In this alternative embodiment (c), similarly to the alternative embodiment (b) described above, the cutting mechanisms 20 are arranged on both sides of the center frame 70, and the rotating disk 21 of the cutting mechanism 20 is supported. Since the structure of the above and the structure for driving the rotating disk 21 are not provided on the inner surface of the housing 10, not only the structure of the shift mechanism 40 is simplified, but also the shift mechanism 40 receives the joint wheel 55 inward. It only needs to be pushed in, which makes it easy to control.

(D) Similar to the other embodiments (b) and (c) described above, the cutting mechanism 20 is arranged at the position where the center frame 70 is sandwiched, and the cutting area R is cut after the existing pipe 1 is cut. On the other hand, a sluice valve V on which the joint ring 55 is preliminarily mounted is inserted into the flow path pipe 54, and after this insertion, the joint ring 55 is inserted by the shift mechanism 40 at the boundary between the remaining pipe portion 1a and the flow path pipe 54. It is configured to shift to a position that covers.

In the other embodiment (d), since the cutting mechanism 20 does not exist inside the housing 10 when the sluice valve V is inserted in the cutting region R, the cutting blade 24 of the cutting mechanism 20 or the like is described in the embodiment. The operation of retracting the joint wheel 55 in the direction away from the existing pipe 1 becomes unnecessary, and the shift mechanism 40 can easily shift the joint wheel 55.

(E) Although the restraint body 32 has been installed in the straight pipe portion, it may be installed in a sluice valve or a switching T-shaped pipe. Further, by installing the restraint body 32 on the sluice valve, it becomes possible to replace the old sluice valve with a new one.

The present invention can be used for a valve installation device and a valve installation method in which a part of an existing pipe is cut and removed and a sluice valve is installed at a cut portion.

1 Existing pipe 1a Remaining pipe part 1G Fitting groove 10 Housing 20 Cutting mechanism 24 Cutting blade (cutting blade part)
25 Grooving blade (grooving blade)
30 Replacement mechanism 40 Shift mechanism 42 Shift rod 42b Regulatory member 54 Flow path tube 55 Joint ring 57 Fitting ring (fitting member)
58 Engagement member 58a Through hole 60 Joint rod P Pipe shaft core V Gate valve

Claims (6)

A sealed housing that houses the existing pipe,
A cutting mechanism that cuts the existing pipe inside the housing,
Among the existing pipes, a part of the existing pipes cut by the cutting mechanism is taken out to the outside of the housing, and between the pair of remaining pipes left inside the housing after the cutting and removal of the existing pipes. A replacement mechanism that inserts a sluice valve that can open and close the flow path from the outside of the housing.
It is provided with a flow path pipe that protrudes outward from the valve body of the sluice valve inserted by the exchange mechanism and a shift mechanism that moves the joint wheel to a position that covers the boundary with the remaining pipe portion.
Orientation wherein Tsugiwa is projecting with are configured in one piece which is molded into a cylindrical shape having a locking projection projecting engaging projections and inwardly projecting outwardly from said engagement protrusion outwardly It has an engaging member which is fixed to the engaging projection by a fastening member and has a through hole formed in a posture along the tube axis of the existing pipe.
A valve installation device in which a stopper is formed on the outer end of the flow path pipe so as to be able to come into contact with the locking projection and project outward within a range that does not come into contact with the inner peripheral surface of the joint wheel. In order to cut the existing pipe, the cutting mechanism has a cutting blade portion that can be driven and rotated around the tube axis of the existing pipe, and is supported inside the housing.
1 The valve installation device described in. Before SL shifting mechanism, which has a shift rod which is inserted into the through hole, a regulating member which is a posture projecting outward from the through hole when the leading end of the shift rod in the through hole is inserted into the shift rod Prepare,
The regulating member is swingably supported by a protruding posture that protrudes outward around a swinging shaft that is orthogonal to the axis of the shift rod and a retracted posture that is along the outer surface of the shift rod. ,
The first or second claim, wherein the shift rod is provided with a shift drive unit for moving the shift rod in a direction away from the valve body of the sluice valve with the shift rod inserted into the through hole of the engaging member. Valve installation device. The cutting mechanism includes a groove forming blade portion that forms a fitting groove on the outer periphery of a portion of the existing pipe that becomes the remaining pipe portion when cutting the existing pipe.
The joint wheel is provided with a fitting member that determines the position of the joint wheel by fitting into the fitting groove .
The valve installation device according to any one of claims 1 to 3, wherein the fitting member is held in a state where the inner diameter is forcibly expanded by a diameter-expanding jig. In a state where the joint wheel is arranged at a position covering the boundary between the remaining pipe portion and the existing pipe, a joining rod for fixing the relative position between the joint wheel and the sluice valve is attached to the joint wheel and the above. The valve installation device according to any one of claims 1 to 4, which is provided between the sluice valve and the sluice valve. The process of arranging the sealed housing at the position to accommodate the existing pipe inside, and
A step of cutting a part of the existing pipe inside the housing by a cutting mechanism and taking it out of the housing.
A step of inserting a sluice valve from the outside of the housing between a pair of remaining pipe portions left inside the housing after a part of the existing pipe is cut and taken out.
Wherein among the gate valve, the flow pipe having a stopper protruding outer end outward from the valve body is molded into a cylindrical shape having a locking projection projecting in the engaging projection and the inner projecting outwardly previously armored advance, an intermediate position of the said gate valve is a pair leaving tube portion Tsugiwa the engaging member is fixed by a fastening member to the engaging projection projecting Rutotomoni outwardly configured in one piece and A position where the locking projection abuts on the stopper so as to cover the boundary between the remaining pipe portion and the flow path pipe by a shift rod locked in the through hole of the engaging member. A valve installation method including a step of moving the joint wheel up to.

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