JP5689732B2 - Leak repair method for existing pipe joints and seal material injection tube for leak repair of existing pipe joints - Google Patents

Description

  The present invention relates to a leak repair method for an existing pipe joint and a seal material injection tube for leak repair of an existing pipe joint.

  As one form of pipe joint, there is a receiving structure at the end of one pipe joined to each other, an insertion opening at the end of the other pipe, and a receiving insertion structure for inserting the insertion opening inside the receiving opening. is there. Such a form of pipe joint is widely used in cast iron pipes such as gas pipes and water pipes.

  A method of covering the periphery of the joint portion with a sealing member is generally employed for leak repair in the joint portion of the existing pipe having the above-described form of pipe joint. In addition, as described in Patent Document 1 below, a method of filling a seal material inside a joint portion is also known. In the method described in Patent Document 1 below, an injection hole for a sealing material is drilled in the upper part of a joint portion of an existing pipe, and the sealing material is injected from the drilled injection hole.

JP 2002-39460 A

  In the leakage repair method described above, the method of covering the periphery of the joint portion with a sealing member such as a resin or a repair tube is such that if the leakage has already occurred from the joint portion, the sealing member covering the joint portion is cured. In the meantime, a leak path is likely to be formed in the uncured sealing member due to the leak pressure, and in order to perform highly reliable leak repair, it is necessary to devise a way to release the leak pressure well so that the leak path is not formed, There is a problem that requires skill in construction.

  On the other hand, the method described in Patent Document 1 for injecting the sealing material from the injection hole drilled in the upper part of the joint portion is arranged such that a permanent magnet is disposed across the joint portion of the existing pipe, and a sealing material mixed with a magnetic material is used. However, it is difficult to set the arrangement state of the magnet and the degree of magnetization, and there is a problem that uniform sealing material injection cannot always be performed easily. Moreover, the method of injecting the sealing material from the injection hole drilled in the upper part of the joint part is basically based on the premise that there is a hemp material called yarn between the inner surface of the joint part and the outer surface of the joint part, There is a problem in that the sealing material cannot be uniformly filled in the joint portion where no yarn exists.

  Furthermore, the method described in Patent Document 1 has not been devised for a no-blow operation in the process from injection of the injection hole to injection of the sealing material into the injection hole, and cannot be applied to the joint portion in the active tube state. There is.

  This invention makes it an example of a subject to cope with such a problem. That is, in the leak repair method performed on the joint part of the existing piping, it is possible to perform highly reliable leak repair without requiring skill in construction, and there is a yarn between the inner surface of the joint and the outer surface of the insertion port. Even if it does not exist, the present invention is able to perform uniform sealing over the entire circumference of the joint part, complete the process with no-blow operation for the joint part in the active tube state, etc. Is the purpose.

  In order to achieve such an object, the present invention comprises at least the following configuration.

  A leakage repair method for an existing pipe joint in which the insertion port of the other pipe is inserted into the reception port of one of the pipes to be joined to each other, between the inner peripheral surface of the reception port and the outer peripheral surface of the insertion port. A perforating step for perforating an insertion hole that leads to the space, and a sealing material injection tube is inserted from the insertion hole, and the distal end portion of the sealing material injection tube is inserted while the sealing material injection tube surrounds the insertion port. A seal material injection tube insertion step positioned in the vicinity of the hole; and while discharging the seal material from the tip of the seal material injection tube, the seal material injection tube is moved in the direction of pulling out from the insertion hole, A leakage repair method for an existing pipe joint, comprising a sealing material injection step for injecting the sealing material over the entire circumference.

  In the present invention having such a feature, the sealing material injection tube is inserted from the insertion hole drilled in the joint portion, and the tip of the sealing material injection tube is placed in the vicinity of the insertion hole with the sealing material injection tube surrounding the insertion port. To be located. Then, while discharging the sealing material from the distal end portion of the sealing material injection tube, the distal end portion is moved, and the sealing material is injected over the entire circumference in the space between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port. To do. As a result, even if there is no yarn between the inner surface of the joint portion and the outer surface of the insertion port, the seal material can be uniformly injected without any gaps to the entire circumference in this space, and the joint portion can be reliably connected. Sealing becomes possible.

  In addition, after inserting the sealing material injection tube into the insertion hole drilled from the drilling of the joint part, the sealing material was injected, and until the insertion hole was plugged with a plug, it could be done by a no-blow operation, maintaining the active tube state The process can be completed by a no-blow operation for all joint parts.

  Furthermore, when the periphery of the joint is finally covered with a sealing member such as a resin or a repair tube, the joint and the repair tube can be covered with the leakage occurring, so the resin and the repair tube are cured. In the meantime, no leak path is formed. Thereby, leak repair with high reliability can be performed without requiring skilled construction.

It is explanatory drawing explaining the structural example of the existing piping joint part used as construction object. It is explanatory drawing which showed the drilling process in embodiment of this invention (descriptive drawing which showed the state which mounted | wore the installation jig on the outer peripheral surface of a joint part). It is explanatory drawing which showed the drilling process in embodiment of this invention (description figure which showed attachment of the drilling tool to a coupling part). It is explanatory drawing which showed the drilling process in embodiment of this invention (descriptive drawing which showed the post-processing process after drilling). It is explanatory drawing which showed the drilling process in embodiment of this invention (descriptive drawing which showed the post-processing process after drilling). It is explanatory drawing which showed the sealing material injection | pouring tube insertion process in embodiment of this invention (explanatory drawing which showed the process of threading an insertion hole). Explanatory drawing which showed the sealing material injection | pouring tube insertion process in embodiment of this invention (Explanatory drawing which showed the process of standing a guide pipe in the threaded insertion hole, and the process of inserting a sealing material injection | pouring tube in a guide pipe) It is. It is explanatory drawing which showed the sealing material injection | pouring tube insertion process in embodiment of this invention (descriptive drawing which showed the example of formation of the front-end | tip part of a sealing material injection | pouring tube). It is explanatory drawing which showed the sealing material injection | pouring tube insertion process in embodiment of this invention. It is explanatory drawing which showed the sealing material injection | pouring process in embodiment of this invention. It is explanatory drawing which showed the sealing material injection | pouring process in embodiment of this invention. It is explanatory drawing (description figure which shows the process of plugging an insertion hole with a plug stopper) which showed the sealing material injection | pouring process in embodiment of this invention. It is explanatory drawing which showed the additional process (main repair process) in embodiment of this invention.

  Hereinafter, a leak repair method for an existing pipe joint and a seal material injection tube for leak repair of an existing pipe joint according to an embodiment of the present invention will be described with reference to the drawings. First, in FIG. 1, a configuration example of an existing pipe joint part that is a construction target will be described. The illustrated example is an example, and the form of the joint portion is not particularly limited thereto.

  In the example of FIG. 1, one pipe P1 and the other pipe P2 that are joined to each other are joined by a joint portion P10. A receiving port P11 having a larger diameter than the other part of the tube P1 and a flange portion P12 positioned at the opening end of the receiving port P11 are formed at the distal end portion of the one tube P1, and one end portion of the other tube P2 is a receiving port. It can be inserted into the inside of P11, and this one end is an insertion port P21. A slope P11a extending toward the opening is formed on the inner periphery of the receiving port P11. With the insertion port P21 inserted into the receiving port P11, the inclined surface P11a allows the inner peripheral surface of the receiving port P11 and the outer peripheral surface of the insertion port P21 to be connected. A sealing space that narrows toward the pipe P1 is formed between the two.

  A rubber seal ring P3 is inserted and disposed in a seal space between the receiving port P11 and the insertion port P21. In the vicinity of the insertion port P21, a push ring P4 is fitted on the outer periphery of the tube P2 so as to be movable in the longitudinal direction, and a holding portion P4a formed on the inner periphery thereof is pressed against the outer surface of the proximal end of the seal ring P3. It is touched. Bolts P5 each having a head P5a at one end are inserted into the plurality of insertion holes P12a formed in the flange portion P12 on the receiving port P11 side, and these bolts P5 are inserted through the insertion holes P4b of the push ring P4. Then, a nut P6 is screwed onto the threaded portion of the bolt P5, and the nut P6 is tightened so that the head portion P5a of the bolt P5 is in pressure contact with the side surface of the flange portion P12. Is pressed against the outer surface of the base end of the seal ring P3. By this pressing, the seal ring P3 is pushed into the inner space of the seal space and elastically deformed, and the space between the receiving port P11 and the insertion port P21 is sealed by this elastic deformation. Such a joint part P10 has a space S on the pipe P1 side from the seal ring P3 between the inner peripheral surface of the receiving port P11 and the outer peripheral surface of the insertion port P21.

  The leak repair method for an existing pipe joint according to an embodiment of the present invention includes a drilling step, a sealing material injection tube insertion step, and a sealing material injection step. The drilling step is a step of drilling an insertion hole leading to the space S between the inner peripheral surface of the receiving port P11 and the outer peripheral surface of the insertion port P21 in the joint portion 10 as described above. The sealing material injection tube insertion step is a step of inserting the sealing material injection tube from the insertion hole, and positioning the distal end portion of the sealing material injection tube in the vicinity of the insertion hole with the sealing material injection tube surrounding the insertion port P21. . The sealing material injection step is a step of injecting the sealing material over the entire circumference in the space S by moving the sealing material injection tube in the direction of pulling out from the insertion hole while discharging the sealing material from the tip of the sealing material injection tube. It is. Each step will be specifically described below. In the process example shown below, each process can be performed by a no-blow operation. According to this, even if it does not use a no blow bag with respect to the joint part of a live pipe state, there is no ejection of the fluid in a pipe | tube in all the processes, and construction can be completed.

  2-5 is explanatory drawing which showed the punching process in embodiment of this invention. FIG. 2 is an explanatory view showing a state in which the installation jig 10 is mounted on the outer peripheral surface of the joint portion P10 (FIG. 2A is a plan view, and FIG. 2B is an XX cross-sectional view). ). The installation jig 10 has a function of stably fixing a valve jig, which will be described later, to the joint portion P10 and airtightly surrounding the portion where the insertion hole is drilled. Prior to the installation of the installation jig 10, cleaning around the joint portion P10 may be performed by wet sand blasting or the like as necessary.

  The installation jig 10 includes winding portions 10A and 10B around which the winding materials 11A and 11B such as chains and belts are hung, and is attached to the joint portion P10 with the two winding materials 11A and 11B. The first winding material 11A is wound around the flange portion P12 of the pipe P1, and the second winding material 11B is wound around the base end portion of the receiving port P11. The installation jig 10 has a cross-sectional shape corresponding to the curved surface of the outer peripheral surface of the receiving port P11, and has an engaging portion 10C that engages with the flange portion P12. With such a configuration of the installation jig 10, the installation jig 10 can be stably fixed around the joint portion P10.

  The installation jig 10 presses and fixes the connection tool 12 to the outer peripheral surface of the joint portion P10. The connection tool 12 has an opening 12A communicating with a work passage described later, and is fixed on the outer peripheral surface of the joint part P10 via a seal ring 13 having an opening corresponding to the opening 12A. A connection part (screw part) 12B is provided on the upper part of the connection tool 12, and a seal ring 14 is also provided around the connection part 12B. The opening 12 </ b> A of the connector 12 hermetically surrounds the periphery of the insertion hole by the seal ring 13.

  FIG. 3 is an explanatory view showing attachment of the drilling tool to the joint part P10. A valve jig 20 is connected to the connector 12. By connecting the lower connecting portion 20A of the valve jig 20 to the connecting portion 12B of the connector 12, the valve jig 20 is stably attached to the joint portion P10 by the installation jig 10.

  The valve jig 20 includes a work passage 20C between the lower connection portion 20A and the upper connection portion 20B, and the work passage 20C can be opened or closed by a ball-shaped valve body 21. The valve body 21 is provided with an opening 21A, and the valve body 21 is rotated by rotating the opening / closing lever 22, and the work passage 20C is blocked by the valve body 21 and the state in which the work passage 20C and the opening 21A communicate with each other. The state can be switched. By attaching such a valve jig 20 to the joint portion P10, the opening 12A of the connector 12 and the work passage 20C of the valve jig 20 are connected in an airtight manner, and the insertion hole has an airtight work passage 20C that can be opened or closed. It can be formed around the location to be drilled.

  Then, the connection portion 30A of the work shaft sliding jig 30 is connected to the upper connection portion 20B of the valve jig 20 in an airtight manner. The work shaft sliding jig 30 supports a work shaft 32 having a perforated blade 31 attached to the tip thereof in an airtight and slidable manner. A seal ring 33 is provided at the insertion port 30 </ b> B of the work shaft sliding jig 30, and the distal end side of the work shaft 32 is inserted into the work shaft sliding jig 30 with the seal ring 33 in close contact with the outer periphery. The proximal end side of the work shaft 32 extends to the outside of the work shaft sliding jig 30, an operation portion 32 </ b> A is provided at the proximal end portion of the work shaft 32, and a tool attachment portion 32 </ b> B is provided at the distal end portion of the work shaft 32. Is provided. A purge flow path 30C in which the work shaft 32 is slidable is provided inside the work shaft sliding jig 30, and a purge discharge port 30D communicates with the purge flow path 30C. The purge discharge port 30D is provided with a valve 30E that can be opened and closed.

  In the drilling process, first, as one process, the valve jig 20 is attached to the joint part P10 via the installation jig 10, and the area around the place where the insertion hole is drilled in the airtight work passage 20C that can be opened or closed. To form. As the next step, the working shaft sliding jig 30 is hermetically connected to the work passage 20C by airtightly connecting the connecting portion 30A of the working shaft sliding jig 30 to the upper connecting portion 20B of the valve jig 20. Connecting. Then, as the next step, the work shaft 32 is inserted into the work passage 20C opened by operating the opening / closing lever 22, and the work shaft 32 is slid in the axial direction and rotated around the shaft so that the joint portion is connected by the drilling blade 31. An insertion hole is drilled in P10. In order to rotate the work shaft 32, a turning tool is connected to the operation unit 32 </ b> A of the work shaft 32. For drilling, the drilling blade 31 attached to the tip of the work shaft 32 is pressed against the outer surface of the joint P10 while driving the turning tool. When the insertion hole is drilled in this state, the insertion hole is hermetically surrounded by the opening 12A of the connector 12, the work passage 20C of the valve jig 20, and the purge passage 30C of the work shaft sliding jig 30. , No blow. By opening the valve 30E and opening the purge discharge port 30D, the work passage 20C is purged with the gas in the joint P10.

  4 and 5 are explanatory views showing a post-processing step after drilling in the drilling step. After drilling the insertion hole P20 in the joint part P10 with the drilling blade 31, the work shaft 32 is pulled out from the work passage 20C, the open / close lever 22 is operated to close the work passage 20C, and the work shaft slides from the valve jig 20. The jig 30 is removed. Thereafter, another work shaft sliding jig 40 is connected to the valve jig 20 as shown in FIGS. 4 (a) and 5 (a). The working shaft sliding jig 40 supports the working shaft 41 having the magnets 41A and 41B attached to the tip thereof in an airtight and slidable manner, and is airtightly connected to the upper connection portion 20B of the valve jig 20. Connecting portion 40A. The work shaft sliding jig 40 includes a detachable lid portion 40C having an insertion port 40B. The insertion port 40B is provided with a seal ring 42, and the tip of the work shaft 41 is in close contact with the outer periphery. The side is inserted into the working shaft sliding jig 40. The proximal end side of the work shaft 41 extends to the outside of the work shaft sliding jig 40, and magnets 41 </ b> A and 41 </ b> B are attached to the distal end portion of the work shaft 41.

  FIG. 4 shows an operation of removing the drill residue remaining on the surface of the drilled insertion hole P20. Here, a slightly larger magnet (first magnet) 41 </ b> A is attached to the tip of the work shaft 41. First, as shown in FIG. 5A, a work shaft sliding jig 40 that supports a work shaft 41 having a magnet 41A attached to the tip thereof in an airtight and slidable manner is connected to the closed work passage 20C in an airtight manner. To do. Then, as shown in FIG. 4B, the work shaft 41 is inserted into the work passage 20C opened by operating the opening / closing lever 22, and the work shaft 41 is slid in the axial direction to drill around the insertion hole P20. The residue is adsorbed and removed by the magnet 41A. After adhering the drilled debris to the magnet 41A, the work shaft 41 is pulled out from the work passage 20C, the open / close lever 22 is operated to close the work passage 20C, and the work shaft sliding jig 40 is removed from the valve jig 20. Remove.

  FIG. 5 shows an operation for removing the perforated residue left in the space S. Here, a slightly thinner magnet (second magnet) 41 </ b> B is attached to the tip of the work shaft 41. First, as shown in FIG. 2A, a work shaft sliding jig 40 that supports a work shaft 41 having a magnet 41B attached to the tip thereof in an airtight and slidable manner is connected to the closed work passage 20C in an airtight manner. To do. Then, as shown in FIG. 4B, the work shaft 41 is inserted into the work passage 20C opened by operating the opening / closing lever 22, and the work shaft 41 is slid in the axial direction and left in the space S. The perforated residue is removed by adsorbing to the magnet 41B. After attracting the drilled debris to the magnet 41B, the work shaft 41 is pulled out from the work passage 20C, the open / close lever 22 is operated to close the work passage 20C, and the work shaft sliding jig 40 is removed from the valve jig 20. Remove.

  The operation shown in FIG. 4 (operation for removing the drilling residue remaining on the surface of the insertion hole) and the operation shown in FIG. 5 (operation for removing the drilling residue remaining in the space S) are common operation axes. Using the sliding jig 40, the work shaft 41 to which the first magnet 41A is attached and the work shaft 41 to which the second magnet 41B is attached can be selectively replaced.

  6-9 is explanatory drawing which showed the sealing material injection | pouring tube insertion process in embodiment of this invention. FIG. 6 is an explanatory view showing a step of threading the insertion hole P20 in the sealing material injection tube insertion step. In this step, using the working shaft sliding jig 30 and the working shaft 32 described above, a thread cutting blade 34 is attached to the tip of the working shaft 32. Then, the work shaft sliding jig 30 that supports the work shaft 32 having the screw cutting blade 34 attached to the tip in an airtight and slidable manner is connected to the work passage 20C in an airtight manner. Thereafter, the work shaft 32 is inserted into the opened work passage 20C by operating the opening / closing lever 22, and the work shaft 32 is slid in the axial direction and rotated around the shaft to be inserted into the insertion hole P20 by the thread cutting blade 34. Perform threading. When the threading is completed, the work shaft 32 is pulled out from the work passage 20C, the work passage 20C is closed, and the work shaft sliding jig 30 is removed from the valve jig 20. After that, it is preferable to perform the post-processing steps shown in FIGS. 4 and 5 and remove the residue generated by the thread cutting by the magnets 41A and 41B.

  FIG. 7 is an explanatory view showing a step of erecting the guide tube 51 in the threaded insertion hole P20 and a step of inserting the sealant injection tube 60 into the guide tube 51 in the sealing material injection tube insertion step. First, as shown in FIG. 5A, a guide tube sliding jig 50 that supports a guide tube 51 through which the sealing material injection tube 60 can be inserted is airtight and slidably supported in a closed working passage 20C. Connecting. Then, as shown in FIG. 6B, the distal end portion of the sealing material injection tube 60 whose proximal end is closed by the valve 61 is airtightly inserted into the guide tube 51, and the guide tube 51 is inserted into the opened work passage 20C. And the guide tube 51 is screwed into the insertion hole P20.

  The guide tube sliding jig 50 is the same as the above-described working shaft sliding jig 40, and includes a connecting portion 50A connected to the upper connecting portion 20B of the valve jig 20, and a detachable lid including an insertion port 50B. The insertion port 50B is provided with a seal ring 52, and the distal end side of the guide tube 51 is inserted into the guide tube sliding jig 50 with the seal ring 52 in close contact with the outer periphery. The proximal end side of the guide tube 51 extends to the outside of the guide tube sliding jig 50, and a screw portion is formed at the distal end portion of the guide tube 51.

  When the sealing material injection tube 60 is inserted into the guide tube 51, it is necessary to close the work passage 20C as shown in FIG. After the guide tube sliding jig 50 is connected to the valve jig 20, the guide tube seal that supports the sealing material injection tube 60 in an airtight and slidable manner on the upper portion of the guide tube 51 in a state where the work passage 20C is closed. A tool 53 is attached. Then, with the upper portion of the guide tube 51 closed by the sealing material injection tube 60 and the guide tube sealer 53, as shown in FIG. 7B, the work passage 20C is opened and the guide tube 51 is operated. It inserts in the channel | path 20C, and the front-end | tip is screwed together in the insertion hole P20.

  FIG. 8 is an explanatory view showing an example of formation of the distal end portion 60A of the sealing material injection tube 60 (FIG. 8A is a perspective view, and FIG. 8B is a side view). In this example, a bent portion 60A3 is formed by bending at the distal end portion 60A of the sealing material injection tube 60, and the distal end portion 60A is cut by two inclined surfaces 60A1 and 60A2 in two directions. A V-shaped discharge port 60A4 is formed at the tip. By bending the distal end portion 60A with the bent portion 60A3, when the distal end portion 60A of the sealing material injection tube 60 reaches the space S from the guide tube 51, the distal end portion 60A changes its direction and surrounds the space S. Proceed in the direction. Moreover, the tip 60A can be advanced more smoothly by providing the inclined surfaces 60A1 and 60A2 at the tip 60A.

  After the distal end portion 60A of the sealing material injection tube 60 is inserted into the space S, the sealing material injection tube 60 is pushed further into the state where the sealing material injection tube 60 surrounds the insertion port P21 as shown in FIG. Thus, the distal end portion 60A of the sealing material injection tube 60 can be positioned in the vicinity of the insertion hole P20. In this state, an injector 62 is attached to the proximal end portion of the sealing material injection tube 60. The injector 62 may be any one that can obtain a desired injection amount by a single operation. When the target existing piping is a gas conduit, it is preferable to use a manual injector 62 in consideration of construction safety. The manual injector 62 includes a container portion 62A filled with a sealing material, an injection handle 62B, a discharge portion 62C, a discharge pressure gauge 62D, and the like.

  10-12 is explanatory drawing which showed the sealing material injection | pouring process in embodiment of this invention. In the sealing material injection step, as shown in FIG. 10, the sealing material injection tube 60 is moved in the direction of pulling out from the insertion hole P20 while discharging the sealing material M from the tip 60A of the inserted sealing material injection tube 60. As shown in FIG. 11, the sealing material M is injected over the entire circumference in the space S.

  As an example, as shown in FIG. 10, an operation of discharging a set amount of the sealing material M from the distal end portion 60A of the sealing material injection tube 60 and an operation of moving the distal end portion 60A of the sealing material injection tube 60 are alternately performed. . Since the discharge amount obtained by one operation of the injector 62 and how much the seal material M expands in the circumferential direction of the space S when this discharge amount is discharged in the space S can be known in advance. The amount of movement of the tip 60A is set so that the cut of the sealing material M is not made according to the spreading width of the sealing material M. From the state where the distal end portion 60A of the sealing material injection tube 60 is positioned in the vicinity of the insertion hole P20, the distal end portion 60A is moved as needed while discharging the sealing material M, and the distal end portion 60A of the sealing material injection tube 60 is inserted into the insertion hole. By performing the final discharge when reaching P20, the sealing material M can be injected seamlessly over the entire circumference of the space S as shown in FIG. In addition, by using the injector 62 that can continuously obtain a desired discharge amount, the tip portion 60A can be continuously moved while injecting the sealing material M from the tip portion 60A.

  FIG. 12 is an explanatory diagram illustrating a process of plugging the insertion hole P20 with the plug plug 63. After injecting the sealing material M over the entire circumference in the space S, the guide tube 51 is pulled out from the work passage 20C, and at the same time, the work passage 20C is closed. In this step, the plug stopper 63 is attached to the tip of the work shaft 32 using the work shaft sliding jig 30 and the work shaft 32 described above. Then, the work shaft sliding jig 30 that supports the work shaft 32 having the plug plug 63 attached to the tip in an airtight and slidable manner is connected to the work passage 20C in an airtight manner. After that, the work shaft 32 is inserted into the opened work passage 20C by operating the opening / closing lever 22, and the work shaft 32 is slid in the axial direction and rotated around the shaft to plug the insertion hole P20 with the plug plug 63. To do.

  FIG. 13 is an explanatory diagram showing additional steps in one embodiment of the present invention. As shown in the drawing, after the sealing material M is injected over the entire circumference in the space S, a process of further sealing the outer periphery of the joint part P10 (this repair process) can be added.

  In the example shown in FIG. 13A, the joint part P <b> 10 having the receiving port P <b> 11 and the insertion port P <b> 12 is covered with the bag material 70. The left and right ends of the bag material 70 are fixed to the pipes P1 and P2 by a hose band 73, respectively. A resin filling hose 71 is connected to the bag material 70 at the lower side, and an air bleeding hose 72 is connected to the upper side. Then, the resin J is filled into the bag material 70 through the resin filling hose 71, and it is confirmed that the resin J is completely filled in the bag material 70 by reaching the air bleeding hose 72. To do. After that, curing curing is performed for a predetermined time.

  In the example shown in FIG. 13B, the repair tube 74 covers the joint P10 having the receiving port P11 and the insertion port P12. A filler K is applied around the joint portion P <b> 10 and is covered with a repair tube 74. The repair tube 74 is a heat-shrinkable material, and the repair tube 74 adheres to the joint part P10 by heating after covering the joint part P10.

  According to the leakage repair method for an existing pipe joint part according to the embodiment of the present invention having the steps as described above, an insertion hole P20 is drilled in the joint part P10 for an existing pipe having a pipe joint with a receiving structure. The sealing material injection tube 60 is inserted from the insertion hole P20 drilled in the joint portion P10, and the distal end portion 60A of the sealing material injection tube 60 is placed in the vicinity of the insertion hole P20 with the sealing material injection tube 60 surrounding the insertion port P12. Position. Then, while discharging the sealing material M from the distal end portion 60A of the sealing material injection tube 60, the distal end portion 60A is moved, and the entire circumference in the space S between the inner peripheral surface of the receiving port P11 and the outer peripheral surface of the insertion port P21. The sealing material M is injected over the interval. Thereby, even if there is no yarn between the inner surface of the receiving port P11 and the outer surface of the insertion port P21 of the joint part P10, the sealing material M can be uniformly injected into the entire circumference in the space S without any gaps. The joint part P10 can be reliably sealed.

  Further, after inserting the sealing material injection tube 60 into the insertion hole P20 drilled from the perforation of the joint portion P10 and injecting with the sealing material M, it is possible to perform the no-blowing operation until the insertion hole P20 is closed with the plug stopper 63. The process can be completed by a no-blow operation with respect to the joint part P10 that maintains the live pipe state.

  In addition, by performing the main repair that covers the periphery of the joint part P10 with the sealing material after that, the main repair can be performed in a state where the leakage that has occurred is stopped, and the leakage to the uncured sealing material No leak path is formed by pressure. Thereby, leak repair with high reliability can be performed without requiring skilled construction.

P1, P2: Pipe, P10: Joint part, P11: Receiving port, P21: Insertion port,
S: space, P20: insertion hole, 60: sealant injection tube, 60A: tip portion,
M: sealing material, 51: guide tube,
20: Valve jig, 20C: Work passage, 32, 41: Work shaft,
30, 40: Work shaft sliding jig, 31: Drilling blade, 41A, 41B: Magnet,
34: Thread cutting blade, 50: Guide tube sliding jig, 63: Plug stopper,
70: Bag material, J: Resin, 74: Repair tube

Claims (14)

A leakage repair method in an existing pipe joint that inserts an insertion port of the other pipe into a receiving port of one pipe to be joined to each other,
A drilling step of drilling an insertion hole leading to a space between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port in the joint portion;
A sealing material injection tube inserting step of inserting a sealing material injection tube from the insertion hole, and positioning the tip of the sealing material injection tube in the vicinity of the insertion hole in a state where the sealing material injection tube surrounds the insertion port; ,
A sealing material injection step of injecting the sealing material over the entire circumference in the space by moving the sealing material injection tube in the direction of pulling out from the insertion hole while discharging the sealing material from the tip of the sealing material injection tube. Leakage repair method for existing pipe joints, characterized by comprising:   The sealing material injecting step is characterized in that an operation of discharging a set amount of sealing material from a distal end portion of the sealing material injection tube and an operation of moving the distal end portion of the sealing material injection tube are alternately performed. Leakage repair method for existing pipe joints described in 1.   In the sealing material injection tube insertion step, a guide tube through which the sealing material injection tube can be inserted is erected in the insertion hole, and the sealing material injection tube is inserted into the insertion hole through the guide tube. The leak repair method for existing pipe joints according to claim 1 or 2. The perforating step includes
A step of attaching a valve jig to the joint part and forming an airtight work passage that can be opened or closed around a place where the insertion hole is drilled,
A step of airtightly connecting a work shaft sliding jig for airtightly and slidably supporting a work shaft having a perforated blade attached to the tip;
The working shaft is inserted into the opened work passage, and the working shaft is slid in the axial direction and rotated around the shaft, and the insertion hole is drilled by the drilling blade. Item 1. Leak repair method for existing pipe joints described in item 1. The perforating step includes
After drilling with the drilling blade,
A step of airtightly connecting a work shaft sliding jig for airtightly and slidably supporting a work shaft having a magnet attached to the tip thereof, to the closed work passage;
The operation shaft is inserted into the opened work passage, and the operation shaft is slid in the axial direction so as to adsorb and remove the perforated debris around the insertion hole by the magnet. Item 5. Leakage repair method for existing pipe joint described in item 4.   The work shaft to which the first magnet for adhering the drilled residue on the surface of the insertion hole is attached and the work shaft to which the second magnet that can be inserted into the insertion hole is attached are selectively replaced. The leakage repair method for an existing pipe joint part according to claim 5. The sealing material injection tube insertion step includes:
A work shaft sliding jig for airtightly and slidably supporting a work shaft having a thread cutting blade attached to a tip thereof, and airtightly connecting to the work passage;
Inserting the work shaft into the opened work passage, sliding the work shaft in the axial direction, rotating the shaft around the shaft, and threading the insertion hole with the thread cutting blade. The leakage repair method for an existing pipe joint part according to any one of claims 4 to 6. The sealing material injection tube insertion step includes:
After threading with the threading blade,
A step of airtightly connecting a guide tube sliding jig for airtightly and slidably supporting a guide tube through which the sealing material injection tube can be inserted, to the closed work passage;
A step of hermetically inserting the distal end portion of the sealing material injection tube whose base end side is closed by a valve into the guide tube;
8. The leak repairing method for an existing pipe joint portion according to claim 7, further comprising a step of inserting the guide pipe into the opened work passage and screwing the guide pipe into the insertion hole. The sealing material injection step includes
After injecting the sealing material over the entire circumference in the space,
Pulling out the guide tube from the work passage and simultaneously closing the work passage;
A step of airtightly connecting a work shaft sliding jig for airtightly and slidably supporting a work shaft having a plug stopper attached to the tip thereof;
The operation shaft is inserted into the opened work passage, and the operation shaft is slid in the axial direction and rotated around the shaft, and the insertion hole is plugged with the plug stopper. A leakage repair method for an existing pipe joint according to claim 8.   After the said sealing material injection | pouring process, the outer periphery of the said joint part is covered with a bag material, and resin is filled in this bag material, The existing piping joint part of Claim 1 characterized by the above-mentioned. Leakage repair method.   The leak repair method for an existing pipe joint part according to any one of claims 1 to 9, wherein an outer periphery of the joint part is covered with a repair tube after the sealing material injection step. A sealing material injection tube used in a leakage repair method for an existing pipe joint part according to any one of claims 1 to 11,
A sealing material injection tube for leak repair of an existing pipe joint, wherein a bending rod along the curvature of the space is formed at the tip of the sealing material injection tube.   13. The seal material injection tube for leak repair of an existing pipe joint according to claim 12, wherein an inclined surface for sharpening the tip is formed at a tip of the seal material injection tube.   The sealing material injection tube for leak repair of an existing pipe joint part according to claim 12 or 13, wherein the sealing material injection tube is made of urethane.

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