JP2010007730A - Method and device of stopping water for piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stop water leakage from a water stop valve by a compact and inexpensive tool. <P>SOLUTION: This device 1 of stopping water for piping consists of a water stopping tool 2 for the piping having a seal member 4 attached in the peripheral section of an annular air tube 3 with a hose 7 for feeding/discharging air connected thereto, and having a flexible funnel-shaped member 5 with a hose 6 for water leakage drainage connected to a lower end opening 5a attached inside, and an air feeding/discharging device 9. The air tube 3 of the water stopping tool 2 arranged inside the existing pipe 10 downside the water stop valve is expanded by an air 8 fed through the hose 7 inserted through a tool recovery hole 16 from the air feeding/discharging device 9 outside the pipe, and the seal member 4 is closely contacted with the inner circumferential surface of the existing pipe 10, thereby stopping the water leakage from the water stop valve preventing flow-down to the weld joint section of the pipe connected to the downside of the existing pipe 10. After completion of welding work, the air tube 3 is contracted, and then, the water stopping tool 2 is pulled out of the tool recovery hole 16 and removed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In order to stop water leakage from the water stop valve so that it does not reach the pipe weld joint when the pipe is replaced at a position below the water stop valve attached to the live pipe. The present invention relates to a piping water stopping method and apparatus to be used.

  When exchanging pipes such as large-diameter pipes at various plants and welding the replaced pipe parts, if water is present in the pipe-welded joints, poor welding occurs, making it difficult to perform sound welding. Become.

  For this reason, when pipe replacement work is performed, the operation related to the pipe system is usually stopped and all water is drained from the pipe system, or it is located upstream of the pipe replacement work place. The maintenance of the water stop valve is thoroughly performed in advance so that the water leak can be prevented by the water stop valve, thereby preventing the leakage water from entering the piping construction site.

  In addition, when repairing or replacing a pipe, as a method for stopping water at a midway position in the water-flow pipe, a jacket for holding a cooling medium such as liquid nitrogen is provided around the pipe on the outer surface of the pipe. A pipe freezing method is known in which an ice plug is formed by locally freezing the internal liquid of the pipe and the flow of the internal liquid in the pipe is stopped by the ice plug.

  Furthermore, a heat transfer rod that contacts the cooling medium and a refrigerant conduit that allows the cooling medium to flow through the hole provided in the pipe wall of the pipe are inserted into the pipe. Therefore, a technique has been proposed in which freezing of the pipe internal liquid at the center of the pipe is promoted so that the pipe freezing method can be applied to large-diameter pipes (see, for example, Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 10-73196 Japanese Patent Laid-Open No. 10-259896

  However, the method of draining all of the piping system when performing pipe replacement work is, for example, that in a cooling water piping system of a nuclear power plant, the fuel is cooled in order to drain all of the piping system. Depending on the piping system, it may be necessary to wait for a long period of time to drain all the water, which may cause a problem that a great constraint is imposed on the work timing and work process.

  Also, in the case of a method for preventing leakage of the water stop valve by thoroughly performing maintenance on the water stop valve located upstream of the pipe replacement work site, Since it is normal for water leakage to occur, there is a problem in that maintenance work requires a great deal of labor and time to allow complete water stoppage with the water stop valve. .

  Therefore, depending on the conditions, the pipe replacement work may not be performed according to the plan with the method of draining all water from the piping system or the method of preventing leakage of the water stop valve through thorough maintenance of the water stop valve. Is concerned.

  In the pipe freezing method shown in Patent Document 1 and Patent Document 2, a cooling medium jacket is attached to the outer periphery of the pipe, and a device for supplying and recovering a cooling medium such as liquid nitrogen is required. There is a problem that the apparatus configuration used for carrying out the pipe freezing method becomes large and costs increase.

  In addition, when the pipes that are subject to pipe replacement work are pipes provided in the radiation control area of the nuclear power plant, the equipment used for the pipe replacement work is contaminated and must be disposable. Therefore, it is desired to simplify the apparatus configuration used for water stop as much as possible and to reduce the cost.

  Furthermore, in the pipe freezing method, when the place where the water should be stopped is close to the water stop valve, there is a concern that if the liquid inside the pipe is frozen to form an ice plug, the water stop valve may be adversely affected. Therefore, the case where it cannot be employed occurs.

  In addition, from the viewpoint of low-temperature brittle fracture, there is also a problem that the pipe freezing method cannot be applied to carbon steel pipes.

  In view of this, the present invention is designed to prevent leakage of water from the water stop valve from reaching the pipe weld joint when pipe replacement work is performed at a position below the water stop valve attached to the live pipe. It is possible to make water and to make the device configuration required for water leakage from the water stop valve compact, and to reduce the cost required for the device. It can be easily recovered and can be mounted and recovered in a short time without impacting the pipe replacement process, and it can be used not only for SUS pipes but also for carbon steel pipes. It is an object of the present invention to provide a piping water stopping method and apparatus used to make it applicable.

  In order to solve the above-mentioned problem, the present invention attaches a flexible funnel-shaped member formed by connecting a leakage water drain hose to the opening at the lower end, corresponding to claim 1, and on the outer peripheral side. A tube member formed by attaching a flexible sealing material over the entire circumference is arranged inside the water stop target pipe and is inserted through a jig collection hole provided in the pipe wall of the water stop target pipe. The tube member is expanded by the fluid supplied from the fluid supply / discharge device outside the pipe through the fluid supply / discharge hose, and the diameter is increased between the outer peripheral portion of the expanded tube member and the inner peripheral surface of the water stop target pipe. The outer surface of the sealing material that is compressed in the direction is brought into close contact with the inner peripheral surface of the water-stopping target pipe, so that the space between the outer peripheral side of the tube member and the inner peripheral surface of the water-stopping target pipe is sealed watertight. Use a water stop method for piping.

  Further, in accordance with claim 2, a flexible sealing material is attached to the outer periphery of a ring-shaped tube member that has an outer diameter corresponding to the inner diameter of the water-stop target pipe when expanded. In addition, the outer periphery of a flexible material-like funnel-shaped member is water-tightly attached to the inside of the tube member, and a leaked water drain hose having a required length is connected to the opening at the lower end of the funnel-shaped member Then, a fluid supply / discharge hose arranged through the pipe wall of the water stop target pipe is connected to a required portion of the tube member to form a pipe water stop jig, and further the fluid supply of the pipe water stop jig It is set as the piping water stop apparatus which has the structure provided with the fluid supply / discharge device for connecting with the drain hose and performing the filling and discharge | emission of the fluid to the said tube member.

  Furthermore, the said structure WHEREIN: Let the sealing material provided in the outer peripheral part of the tube member of a piping water stop jig | tool be the structure made into the closed-cell type flexible porous rubber.

  Furthermore, in each of the above-described configurations, a plurality of convex portions over the entire circumference in the circumferential direction are arranged at required intervals in the axial direction on the outer surface of the sealing material provided on the outer peripheral portion of the tube member of the pipe water stopping jig. It is set as the structure made to provide.

According to the present invention, the following excellent effects are exhibited.
(1) A tube member formed by attaching a flexible funnel-like member formed by connecting a leak water drain hose to the opening at the lower end on the inner peripheral side and attaching a flexible sealing material to the outer peripheral side over the entire circumference. Supply from the fluid supply / discharge device outside the pipe through the fluid supply / discharge hose that is arranged inside the water stop target pipe and is inserted through the jig collection hole provided in the pipe wall of the water stop target pipe. The tube member is expanded by a fluid, and the outer surface of the sealing material compressed in the radial direction between the outer peripheral portion of the expanded tube member and the inner peripheral surface of the water stop target pipe is the water stop target. A pipe water-stop method that seals the space between the outer peripheral side of the tube member and the inner peripheral surface of the water-stop target pipe in close contact with the inner peripheral surface of the pipe, and a pipe that is water-stopped during expansion So that the outer diameter corresponds to the inner diameter of A flexible sealing material is attached to the outer periphery of the ring-shaped tube member, and the outer periphery of the flexible material funnel-like member is water-tightly attached to the inside of the tube member. Connect the drainage hose with the required length to the opening at the lower end of the member, and connect the fluid supply / discharge hose arranged through the pipe wall of the water stop target pipe to the required part of the tube member. And a fluid supply / discharge device connected to the fluid supply / discharge hose of the pipe water stop jig for filling and discharging the fluid to and from the tube member. Since it is a pipe water stop device with a pipe, when pipe replacement work is performed below the water stop valve attached to the live pipe, it is placed inside the water stop target pipe connected to the lower side of the water stop valve. The pipe member of the pipe By attaching the pipe water stop jig to the inside of the water stop target pipe, the pipe welded joint between the water stop target leak water pipe and the pipe connected to the lower side of the water stop valve Since it is possible to prevent the possibility of reaching the part, it is possible to perform sound welding of the pipe welded joint part.
(2) Since the processing to be performed on the water stop target pipe in order to attach the pipe water stop jig to the water stop target pipe only requires drilling a jig collection hole, the pipe water stop treatment This eliminates the need for labor and time required for wearing the tool. Furthermore, after finishing the welding operation of the pipe weld joint, after draining the fluid filled in the tube member, pull out the fluid supply / discharge hose from the jig collection hole of the water stop target pipe, Only by pulling out the tube member, sealing material, funnel-shaped member, and leaked water drain hose connected to the fluid supply / discharge hose from the jig collection hole to the outside of the pipe, the pipe The jig can be easily removed. Therefore, attachment and recovery of the pipe water stop jig can be performed in a short time, and the possibility of impacting the pipe replacement work process can be eliminated.
(3) Since the pipe water stop jig can be attached to the water stop target pipe at room temperature, it can be applied to water stop of pipes of any material such as SUS pipes and carbon steel pipes.
(4) The pipe water stopping jig can be made compact and inexpensive. Therefore, it can be made advantageous when the pipe water stop jig is a disposable pipe water stop jig for use in a radiation control area in a nuclear power plant.
(5) By making the sealing material provided on the outer periphery of the tube member of the pipe water stopping jig into a closed cell type flexible porous rubber, the tube member is inflated inside the water stopping target pipe. Thus, the outer surface of the sealing material compressed in the radial direction between the outer peripheral portion of the tube member and the inner peripheral surface of the water-stop target pipe easily follows the shape of the inner peripheral surface of the water-stop target pipe. It can be made to adhere. Therefore, it becomes possible to easily increase the water stoppage between the outer peripheral side of the pipe water stopping jig and the inner peripheral surface of the water stop target pipe.
(6) A configuration in which a plurality of convex portions over the entire circumference in the circumferential direction are arranged in the axial direction at a required interval on the outer surface of the sealing material provided on the outer peripheral portion of the tube member of the pipe water stopping jig. By expanding the tube member inside the water stop target pipe and compressing the sealing material in the radial direction between the outer peripheral portion of the tube member and the inner peripheral surface of the water stop target pipe, The tops of the plurality of convex portions provided on the outer surface of the sealing material can be brought into close contact with the inner peripheral surface of the water stop target pipe in the circumferential direction. This makes it possible to form a plurality of water-tight seals that are offset by the required dimension in the axial direction between the outer surface of the sealing material and the inner peripheral surface of the water-stop target pipe. The water stoppage between the outer peripheral side of the jig and the inner peripheral surface of the water stop target pipe can be made more reliable.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIGS. 1 (a), (b), (c) and FIG. 5 show one embodiment of the pipe water stopping method and apparatus according to the present invention, which are as follows.

  That is, the pipe water stop device of the present invention has a water stop target pipe 10 as shown by a two-dot chain line in FIG. As a tube member made of a flexible material having a ring shape having an outer diameter corresponding to the inner diameter, for example, a seal material 4 made of a flexible material is provided on the entire surface of the rubber air tube 3 on the outer diameter side surface. It is attached in a watertight manner to make it an integral object. Furthermore, the outer peripheral part of the funnel-shaped member 5 made of a flexible material is attached to the inside of the air tube 3 in a water-tight manner, and the opening 5a provided at the central portion serving as the lower end of the funnel-shaped member 5 is made of a flexible material. The upper end opening of the leaked water drain hose 6 is connected in a watertight manner.

  Supply of air 8 as a fluid to the air tube 3 and the air tube 3 are provided below the funnel-shaped member 5 at a required position in the circumferential direction of the air tube 3 and do not interfere with the sealing material 4. An air supply / discharge hose 7 is attached as a fluid supply / discharge hose for discharging air 8 from the pipe to constitute the pipe water stop jig 2.

  Further, an air supply / discharge device 9 as a fluid supply / discharge device for connecting to the air supply / discharge hose 7 of the pipe water stop jig 2 is provided to constitute the pipe water stop device 1.

  More specifically, the sealing material 4 is made of, for example, a closed-cell porous rubber that does not allow water to pass through. A plurality of convex portions 4 a having a corrugated cross-sectional shape extending around the circumference are provided at a required interval in the axial direction of the sealing material 4. Thus, when the air tube 3 is expanded inside the water stop target pipe 10, as shown in FIG. 2, the outer periphery of the air tube 3 that expands into a ring shape and the inside of the water stop target pipe 10. Between the peripheral surface, the sealing material 4 is compressed in the radial direction, and each convex portion 4a of the cross-sectional waveform provided on the outer surface of the radially compressed portion of the sealing material 4 is crushed. As a result of the restoring force of each convex portion 4a elastically deformed so as to be crushed, the top of each convex portion 4a is placed on the inner peripheral surface of the water stop target pipe 10, respectively. It is in close contact. Therefore, when the air tube 3 is expanded, each convex portion 4a of the sealing material 4 disposed on the outer peripheral side of the air tube 3 is in contact with the inner peripheral surface of the water stop target pipe 10, respectively. Since a water-tight seal is formed in close contact with the entire circumference in the circumferential direction at a position shifted by a required dimension in the axial direction of the target pipe 10, the inner peripheral surface of the water-stop target pipe 10 and the air Water leakage from between the outer surface of the sealing material 4 provided on the outer periphery of the tube 3 can be reliably prevented. Moreover, since the sealing material 4 provided on the outer peripheral portion of the air tube 3 is made of a flexible material as described above, unevenness due to an oxide film such as rust is formed on the inner peripheral surface of the water stop target pipe 10. Even if the sealing material 4 is made to follow the unevenness so as to be deformed and brought into close contact, the inner peripheral surface of the water stop target pipe 10 and the sealing material 4 provided on the outer peripheral portion of the air tube 3 Water leakage from the outside surface can be prevented.

  Furthermore, as shown in FIG. 3, when the water stop target pipe 10 is a sheet-wound pipe, a welded bead 11 formed at one place in the circumferential direction is required on the inner side of the pipe inner peripheral surface. Although the dimension protrudes, it deform | transforms so that the sealing material 4 made from the said flexible material may be crushed between the outer peripheral part of the said air tube 3 to be expanded, and the bead 11 of the welding part of the said piping 10 for water stoppage. As a result, the outer surface of the sealing material 4 is brought into close contact with the bead 11 of the welded portion of the water stop target pipe 10 and the curved surface shapes on both sides of the bead 11 to form a watertight seal. Therefore, even if the weld stop bead 11 is present in the water stop target pipe 10, it is possible to prevent the risk of water leaking between the curved portions on both sides of the bead 11 and the sealing material 4. is there.

  The funnel-shaped member 5 is formed of, for example, a rubber sheet as a flexible material.

  The leak water drain drain hose 6 is, for example, a rubber hose and, as will be described later, the pipe is passed through a plug hole 13 for welding inspection provided at a required place of the pipe 12 to be newly replaced by pipe replacement work. The length dimension is set so that the drain receiver 14 provided outside 12 can be arranged.

  The air supply / discharge hose 7 is, for example, a pressure-resistant hose made of rubber (including urethane) that can withstand the air pressure for expanding the air tube 3, and a tip portion of the hose 7 is a predetermined portion of the air tube 3. Are integrally connected to an air supply / discharge nozzle 3a. In addition, the connection part of the front-end | tip part of this air supply / discharge hose 7 and the air supply / discharge nozzle 3a of the air tube 3 is good also as a structure attached so that attachment or detachment is possible via the one-touch coupling etc. which are not shown in figure.

  Further, the air supply / discharge hose 7 is connected to the pipe water stop inside the existing pipe 10 as a water stop target pipe left below the water stop valve 15 when pipe replacement work is performed as will be described later with reference to FIG. In the state where the jig 2 is disposed, the length is set to a length that can be pulled out of the pipe through the jig collection hole 16 provided in the pipe wall of the existing pipe 10 and connected to the air supply / discharge device 9.

  The air supply / exhaust device 9 is configured to limit the pressure resistance of the air tube 3 with a regulator (not shown) by supplying air 8 supplied at a required pressure from, for example, a compressor (not shown) or an air supply unit widely and generally provided in a plant. An air supply valve 9a for starting the supply to the air supply / discharge hose 7 in a state adjusted to a predetermined pressure, and the pressure of the air 8 supplied into the air tube 3 through the air supply / discharge hose 7 Exhaust gas for exhausting the air 8 in the air tube 3 to the atmosphere through the air supply / discharge hose 7 by switching the gauge 9b for monitoring the air and the air supply / discharge hose 7 to communicate with the atmosphere. The valve 9c is provided.

  Thus, the air supply valve 9a of the air supply / discharge device 9 is opened to supply air 8 of a predetermined pressure to the air supply / discharge hose 7, thereby filling the air tube 3 with the air 8 The air tube 3 can be expanded. On the other hand, when the air supply valve 9a of the air supply / exhaust device 9 is closed, the exhaust valve 9c is opened to fill the air tube 3 as shown by a two-dot chain line in FIG. The air tube 3 can be contracted by exhausting the air 8 that has been discharged into the atmosphere through the air supply / discharge hose 7 and the exhaust valve 9c of the air supply / discharge device 9. Further, in the state where the air 8 in the air tube 3 is exhausted and the air tube is contracted, the air supply / discharge hose 7 is provided on the wall of the existing pipe 10 as the water stop target pipe. The air tube 3, the sealing material 4, the funnel-shaped member 5, and the leaked water drainage hose 6 made of the flexible material connected to the air supply / discharge hose 7 are drawn out from the pipe collecting hole 16 to the outside of the pipe. Through the jig recovery hole 16, it can be pulled out to the outside of the pipe.

  Next, using the pipe water stop device 1 having the above configuration, pipe replacement work at a position below the water stop valve 15 attached to the live pipe 17 in a required plant, for example, replacement of a T-shaped pipe A procedure for stopping the water so that the leaked water 19 leaking from the water stop valve 15 does not reach the pipe welded joint portion 18 in the construction will be described.

  First, as shown in FIG. 4, with the water stop valve 15 attached to the live pipe 17 closed, the existing pipe 10 connected to the lower side of the water stop valve 15 is cut at an intermediate position in the vertical direction. Then, the existing T-shaped pipe 20 connected to the lower side of the existing pipe 10 as shown by a two-dot chain line in FIG. 4 is removed.

  Next, a pipe weld joint portion 18 is formed between the lower end portion of the existing pipe 10 remaining below the stop valve 15 and the upper end portion of the T-shaped tube 12 as a newly replaced pipe. A groove processing (not shown) is performed, and a jig recovery hole 16 is formed in a lower portion of the pipe wall of the existing pipe 10.

  Next, the pipe water stop jig 2 is carried inside the existing pipe 10, and the air supply / discharge hose 7 connected to the air tube 3 is pulled out of the pipe through the jig collection hole 16. Is connected to the air supply / discharge device 9, and the air tube 3 of the pipe water stopping jig 2 is arranged at an inner circumference at a position above the jig recovery hole 16 of the existing pipe 10 by a required dimension. Arrange along the surface in the circumferential direction. In order to facilitate the operation of arranging the air tube 3 of the pipe water stopping jig 2 along the inner circumferential surface of the existing pipe 10 along the circumferential direction as described above, for example, FIG. As shown by an alternate long and short dash line, the air supply / discharge hose 7 can be passed in the inner and outer directions in a flat ring shape having an outer diameter slightly smaller than the inner diameter of the existing pipe 10 and in at least one place in the circumferential direction. In a state where the air tube 3 of the pipe water stopping jig 2 is placed along the circumferential direction on the upper side of the positioning tool 21 provided with the cutout portion that can be formed, the pipe stopping together with the positioning tool 21 is provided. The water jig 2 may be inserted from the lower end side of the existing pipe 10 to a position above the jig recovery hole 16 by a required dimension.

  After the air tube 3 of the pipe water stop jig 2 is arranged along the circumferential direction on the inner peripheral surface of the required height inside the existing pipe 10 as described above, the air supply / discharge device 9 By opening the air supply valve 9a, the air tube 3 is filled with air 8 having a predetermined pressure supplied from the air supply / discharge device 9 through the air supply / discharge hose 7, and as shown in FIG. By expanding the tube 3, the sealing material 4 provided on the outer peripheral portion of the air tube 3 is expanded between the outer peripheral portion of the air tube 3 that expands into a ring shape and the inner peripheral surface of the existing pipe 10. The outer surface of the sealing material 4 is brought into close contact with the inner peripheral surface of the existing pipe 10 over the entire circumference in the circumferential direction. Thereby, the space between the outer peripheral side of the expanded air tube 3 of the pipe water stop jig 2 and the inner peripheral surface of the existing pipe 10 is watertightly sealed over the entire circumference in the circumferential direction by the sealing material 4. Become so.

  When the outer surface of the sealing material 4 is brought into close contact with the inner peripheral surface of the existing pipe 10, a filler (not shown) such as grease, petrolatum, or silicone sealant is applied in advance to the outer surface of the sealing material 4. By doing so, you may make it improve the watertight sealing property between the outer peripheral surface of the sealing material 4, and the internal peripheral surface of the existing piping 10. FIG. The positioning tool 21 may be removed when the inflated air tube 3 is fixed in position inside the existing pipe 10.

  When the watertight seal by the sealing material 4 is formed between the outer peripheral side of the expanded air tube 3 of the pipe water stopping jig 2 and the inner peripheral surface of the existing pipe 10 as described above, Leaked water 19 leaking into the existing pipe 10 from the water stop valve 15 connected to the live pipe 17 provided on the upper side of the pipe 10 is generated by the outer periphery of the pipe water stopping jig 2 and the inner surface of the existing pipe 10. The leakage water 19 is guided to the upper side of the funnel-shaped member 5 through the sealing material 4 of the pipe water stopping jig 2 and the upper side of the air tube 3, and the funnel-shaped member 5 is opened. After being collected in the part 5a, it is guided downward through the leaked water drain hose 6.

  After the air tube 3 is expanded, the air supply valve 9a is closed as long as the internal pressure of the expanded air tube 3 can be maintained according to the type of the air supply / discharge device 9. Also good. Alternatively, the air supply valve 9a is left open, and a predetermined pressure of the air 8 adjusted within the pressure limit of the air tube 3 by a regulator (not shown) is continuously applied to the air tube 3. Good.

  Thereafter, a T-shaped tube 12 that is pre-grooved at the upper end portion is disposed under the existing piping 10 as a new replacement tube, and the lower end portion of the existing piping 10 and the T-shape are disposed. A pipe weld joint 18 is formed between the upper end of the pipe 12 and the leak water drain hose 6 of the pipe water stop jig 2 passes through the inside of the T-shaped pipe 12 before the leak water drain. The lower part of the extraction hose 6 is arranged so as to protrude to the outside of the pipe through the plug hole 13 for welding inspection provided at a required portion of the T-shaped pipe 12, and the lower end thereof is arranged outside the T-shaped pipe 12. The drain receiver 14 is provided. As a result, the leaked water 19 leaking from the water stop valve 15 into the existing pipe 10 is received on the upper side of the funnel-shaped member 5 of the pipe water stop jig 2 as described above, and then the leaked water drain hose. 6, all are sent to the drain receiver 14. Therefore, it is possible to prevent the leakage water 19 from the water stop valve 15 from reaching the pipe weld joint 18 between the existing pipe 10 and the newly replaced T-shaped pipe 12.

  In this state, by performing the welding operation of the pipe weld joint 18, the pipe weld joint 18 can be welded in the absence of water, and the lower end of the existing pipe 10 and the T-shape The upper end of the tube 12 is welded soundly.

  After the welding operation of the pipe welded joint portion 18 is completed as described above, if the air supply valve 9a in the air supply / discharge device 9 remains open, the air supply valve 9a is closed in advance, When the exhaust valve 9c of the air supply / discharge device 9 is opened, the air 8 having a predetermined pressure filled in the air tube 3 of the pipe water stopping jig 2 is exhausted from the air supply / discharge hose 7 and the air supply / discharge device 9. Since the air is discharged to the outside through the valve 9c, the air tube 3 contracts. Further, since the internal space of the air tube 3 is in communication with the atmosphere via the air supply / discharge hose 7 and the exhaust valve 9c of the air supply / discharge device 9, the air tube 3 is subjected to an external force. It can be freely contracted and deformed.

  Therefore, after that, the air supply / discharge hose 7 is pulled out from the jig collection hole 16, and the air tube 3, the sealing material 4, the funnel-shaped member 5 and the leak connected to the air supply / discharge hose 7 are leaked. The water drain hose 6 is pulled out of the pipe through the jig collection hole 16. As a result, the pipe water stop jig 2 is recovered from the inside of the existing pipe 10.

  After collecting the pipe water stop jig 2 as described above, after appropriately confirming the welding state of the pipe weld joint 18, the jig collection hole 16 provided in the pipe wall of the existing pipe 10, The pipe inspection work of the T-shaped tube 12 is finished by watertightly closing the welding inspection plug holes 13 provided at the required portions of the T-shaped tube 12 from the outside with plugs or lid members (not shown).

  Thus, according to the pipe water stop device and the pipe water stop method using the pipe water stop device of the present invention, when pipe replacement work is performed below the water stop valve 15 attached to the live pipe 17. In addition, by installing the pipe water stop jig 2 inside the existing pipe 10 located on the upper side of the pipe weld joint 18, there is a possibility that the leaked water 19 of the water stop valve 15 may reach the pipe weld joint 18. This can be prevented in advance, and sound welding of the pipe weld joint 18 can be performed. Further, since the processing to be performed on the existing pipe 10 in order to attach the pipe welding jig 2 to a required portion inside the existing pipe 10 only needs to drill the jig collecting hole 16, the pipe The trouble and time required for mounting the water stop jig 2 can be eliminated.

  Furthermore, after the welding operation of the pipe weld joint 18 under the water stop valve 15 connected to the live pipe 17 is completed, the air 8 filled in the air tube 3 is exhausted, The air supply / discharge hose 7 is pulled out from the jig collection hole 16 provided in the existing pipe 10, and the air tube 3, the sealing material 4, the funnel-shaped member 5, and the leakage connected to the air supply / discharge hose 7 are leaked. The pipe water-stopping jig 2 can be easily removed from the inside of the existing pipe 10 and the T-shaped pipe 12 only by pulling out the water drain hose 6 from the jig collection hole 16. Therefore, the pipe water stop jig 2 can be attached and recovered in a short time, and the risk of having an impact (a large influence) on the pipe replacement work process can be eliminated.

  Furthermore, unlike the conventional pipe freezing method, all the water leakage of the leaked water 19 of the water stop valve 15 by attaching the pipe water stop jig 2 can be performed at room temperature, so that not only the pipe made of SUS material but also carbon. It can be applied to water stopping of pipes of any material such as steel pipes.

  Moreover, the pipe water stop jig 2 includes a flexible air tube 3, a flexible sealing material 4, a flexible funnel-shaped member 5, a leaked water draining hose 6, and an air supply / discharge hose 7. While being a compact structure, the part which uses a metal can be limited to the connection part of the air supply / discharge nozzle 3a of the air tube 3 and the air supply / discharge hose 7, and any one of the above Since it is not necessary to use a special material for the members 3, 4, 5, 6, 7, the pipe water stopping jig 2 can be made inexpensive. Therefore, it can be made advantageous when the disposable pipe water stopping jig 2 for use in a radiation control area in a nuclear power plant is used.

  In addition, this invention is not limited only to the said embodiment, The cross section over the perimeter of the circumferential direction is provided in the outer surface of the sealing material 4 provided in the outer peripheral part of the air tube 3 of the piping water stop jig | tool 2. Although it has been shown that a plurality of shape-wave-shaped convex portions 4a are provided at a required interval in the axial direction, a plurality of convex portions 4a provided on the outer surface of the sealing material 4 are arranged at a required interval in the axial direction. If there is, the cross-sectional shape may be a rectangle, a triangle, a trapezoid, or the like. The number of convex portions 4 a arranged on the outer surface of the sealing material 4 in the axial direction may be appropriately changed according to the thickness dimension of the air tube 3. Furthermore, from the viewpoint of enhancing the sealing performance between the outer surface of the sealing material 4 provided on the outer peripheral portion of the air tube 3 of the pipe water stopping jig 2 and the inner peripheral surface of the existing piping 10, Although it is desirable to provide a plurality of convex portions 4a extending over the entire circumference in the circumferential direction at a required interval in the axial direction of the sealing material 4, the outer surface of the sealing material 4 may be flat. Good.

  When the pipe water stop jig 2 is mounted inside the existing pipe 10, a watertight seal between the inner peripheral surface of the existing pipe 10 and the outer surface of the seal material 4 of the pipe water stop jig 2 is provided. From the viewpoint of enhancing the properties, it is preferable to apply a filler such as grease, petrolatum, or silicone sealant to the outer surface of the sealing material 4 in advance, but the application of the filler may be omitted. .

  The air tube 3, the sealing material 4, the funnel-shaped member 5, and the leaked water drain drain hose 6 are all made of rubber, but the air tube 3 is filled with air 8 and expanded to fill the water-stop target. The ring shape along the circumferential direction can be maintained on the inner peripheral surface of the existing pipe 10 as a pipe, and the sealing material 4 is formed between the ring-shaped outer peripheral portion formed during air filling and the inner peripheral surface of the existing pipe 10. Is compressed in the radial direction so that the outer surface of the sealing material 4 can be brought into close contact with the inner peripheral surface of the existing pipe 10 so that a watertight seal is formed. It may be made of a material. Further, the sealing material 4 and the funnel-shaped member 5 can be joined in a watertight manner to a predetermined portion of the air tube 3, and the leaked water drain hose 6 is connected to the opening 5 a at the lower end of the funnel-shaped member 5. As long as the sealing member 4, the funnel member 5 and the leaked water drain hose 6 can be pulled out integrally with the air tube 3 through the jig collecting hole 16 provided in the existing pipe 10 so as to be watertightly joined. The sealing material 4, the funnel-shaped member 5, and the leaked water drain hose 6 may be made of a flexible material other than rubber.

  The air tube 3 and the sealing material 4, the air tube 3 and the funnel-shaped member 5, the funnel-shaped member 5 and the leaked water drain hose 6 are attached to each other with the members 3, 4, 3, 5, 5 and 6. If it can be attached so as to be watertight and integrated, it may be performed by any method according to the material of each of the members 3, 4, 5 and 6 as well as adhesion.

  Although the air 8 has been exemplified as the fluid that fills the air tube 3 in order to expand the air tube 3 of the pipe water stop jig 2, any other fluid may be used.

  Of course, various modifications can be made without departing from the scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a pipe water stopping method and apparatus according to the present invention, in which (A) is a plan view, (B) is a schematic cut side view showing a state where an air tube is not filled with air, and (C). FIG. 4 is a schematic cut side view showing a state where an air tube is filled with air and expanded. FIG. 2 is an enlarged cutaway side view showing a portion of a seal member provided on an outer peripheral portion of an air tube in the pipe water stopping jig of the apparatus of FIG. 1. It is a top view which expands and shows the bead part of this board winding pipe | tube at the time of mounting | wearing the inside of a board winding pipe with the piping water stop jig | tool of the apparatus of FIG. 1 shows a procedure for stopping leakage water from the stop valve in order to perform pipe replacement work at a position below the stop valve attached to the live pipe using the apparatus of FIG. It is a general | schematic cutting side view which shows the state which carried in the piping water stop jig | tool in the existing piping of lower side. Fig. 1 shows the procedure for stopping leaked water from the water stop valve when pipe replacement work is performed at a position below the water stop valve attached to the live pipe using the device shown in Fig. 1. It is a general | schematic cutting side view which shows the state which expanded the air tube of the piping water stop jig | tool, and mounted the pipe water stop jig | tool above the pipe welding joint part.

Explanation of symbols

1 Piping water stop device 2 Piping water stopping jig 3 Air tube (tube member)
4 Sealing material 4a Convex part 5 Funnel-like member 5a Opening 6 Leaked water drain hose 7 Air supply / discharge hose (fluid supply / discharge hose)
8 Air (fluid)
9 Air supply / discharge device (fluid supply / discharge device)
10 Existing piping (piping for water stoppage)
12 T-shaped pipe (pipe)
15 Stop valve 16 Hole for collecting jig 17 Live pipe 18 Pipe welded joint

Claims (4)

  Attach a flexible funnel-shaped member with a leak water drain hose connected to the opening at the lower end on the inner circumference side, and a tube member with a flexible sealing material on the outer circumference side over the entire circumference. By the fluid supplied from the fluid supply / discharge device outside the pipe through the fluid supply / discharge hose arranged inside the pipe and inserted through the jig collection hole provided in the pipe wall of the water stop target pipe The tube member is expanded, and the outer surface of the sealing material compressed in the radial direction between the outer peripheral portion of the expanded tube member and the inner peripheral surface of the water stop target pipe A pipe water-stop method, wherein the space between the outer peripheral side of the tube member and the inner peripheral surface of the water-stop target pipe is sealed tightly to the peripheral surface.   A flexible sealing material is attached to the outer circumference of a ring-shaped tube member that has an outer diameter corresponding to the inner diameter of the water stop target pipe when expanded, and the inner side of the tube member is flexible. Attach the outer periphery of a funnel-shaped member made of a material with watertightness, connect a drainage drain drain hose having a required length to the opening at the lower end of the funnel-shaped member, A pipe water stopping / discharging hose arranged through the pipe wall of the water stopping target pipe is connected to form a pipe water stopping / discharging jig, and further connected to a fluid supplying / discharging hose of the piping / water stopping / stopping jig to connect the tube member. A pipe water stop device comprising a fluid supply / discharge device for filling and discharging fluid to and from the pipe.   The pipe water stop device according to claim 2, wherein the sealing material provided on the outer periphery of the tube member of the pipe water stop jig is a closed cell type flexible porous rubber.   3. The outer surface of the sealing material provided on the outer peripheral portion of the tube member of the pipe water stopping jig is provided with a plurality of convex portions over the entire circumference in the circumferential direction arranged at a required interval in the axial direction. 3. Piping water stop device according to 3.

Images