JP2011012787A - Piping repair method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping repair method facilitating working of a repaired portion.SOLUTION: The piping repair method includes steps of: arranging a frame body 2 on the outer peripheral surface 11 of a pipe 1 to surround a defect 10; mounting first tools 3a, 3b for pressing the opening edge of the frame body 2 of a portion along the circumferential direction of the pipe 1, to the pipe 1; mounting a second tool 4 for pressing the opening edge of the frame body 2 of a portion along the axial direction of the pipe 1, to the pipe 1; filling a hardenable sealant Q1 in an opening 20 of the frame body 2 in the mounted state of the first tools 3a, 3b and second tool 4; blocking the opening 20 of the frame body 2 filled with the sealant Q1, with a cover; hardening the sealant Q1 after the step of blocking with the cover; and removing the frame body 2 and the cover after the step of hardening the sealant Q1.

Description

  The present invention relates to a pipe repair method for repairing a pipe by sealing a defect that causes leakage of a fluid flowing through the pipe.

  2. Description of the Related Art Conventionally, in facilities such as power plants and chemical plants, a technique for transporting heat and materials by circulating a fluid in piping has been frequently used. The piping may have defects such as local cracks and pits with long-term use. The occurrence of defects is caused by the pipe being repeatedly subjected to stress due to fluid pressure fluctuations, the pipe being corroded by the fluid, and the like. The defect eventually develops so as to penetrate the inner wall of the pipe, and the fluid leaks through the defect.

  Examples of conventional pipe repair methods for stopping fluid leakage include the following methods. Drain the fluid in the pipe and dry the defective part. Then, after covering the defects and depositing the adhesive, the defects are closed by curing the adhesive. In the conventional piping repair method, it is necessary to stop the operation of a part or all of the facility when extracting the fluid in the piping, and the operating rate of the facility is lowered. One of repair methods that can be performed during operation is a technique disclosed in Patent Document 1.

  In the repair method of patent document 1, the leak location (defect location) is covered with the container-shaped repair tool. A filler and an underwater adhesive are accommodated between the repair device and the pipe. By applying a load to the repair device, the filler and the underwater adhesive are pressed against the pipe. The leakage of the fluid can be stopped urgently when the filler pushes and closes the defect with elastic repulsion, or the underwater adhesive is embedded in the defect and hardens.

  By the way, maintenance such as a plant is often regularly performed. If the defective pipes are replaced intensively during regular maintenance, the operating rate of the facility will hardly decrease. From this point of view, it is desirable to maintain the effect of repair until the pipe replacement opportunity such as regular maintenance. In order to maintain the effect of the repair, it is effective to perform additional repair on the repaired part to strengthen the repair, or to perform repair again when leakage recurs after repair.

JP 2003-4195 A

In the conventional repair method, it is possible to stop leakage of the fluid, but it is not easy to process the repaired portion, and it is not easy to perform additional repair or re-repair.
For example, in the method of depositing an adhesive on a defect, the shape and dimensions of the cured adhesive vary for each repaired part. In order to perform additional repair or re-repair, complicated processing is required in order to eliminate unevenness of the cured adhesive or to mold the cured adhesive into a predetermined size and shape.

In the technique of Patent Document 1, it is necessary to remove the repair tool in order to perform additional repair on the portion where the filler is pressed at the defective portion. If the repair tool is removed, the filler will come off from the defective part, so in the end, repair will be started again from the beginning.
In the method of embedding the underwater adhesive in the defect, it is difficult to control the distribution of the underwater adhesive in the defect, and a fluid leakage path (leak path) is formed in a portion where the filling degree of the underwater adhesive is relatively low. Sometimes. Since the leakage path has an inner diameter smaller than the defect, it is difficult to fill the underwater adhesive here. In order to remove the underwater adhesive causing the leakage path and refill the underwater adhesive, a complicated process is required.

  The present invention has been made in view of the above circumstances, and provides a pipe repair method that can easily stop leakage of fluid during operation of a facility and can easily process a repaired portion. This is one of the purposes.

In the present invention, the following means are adopted in order to achieve the object.
The pipe repair method of the present invention is a pipe repair method for sealing a defect that causes leakage of a fluid flowing through a pipe, the step of arranging a frame so as to surround the defect on the outer peripheral surface of the pipe, and the pipe A step of attaching a first jig for pressing the opening edge of the frame body along the circumferential direction of the pipe to the pipe, and pressing the opening edge of the frame body along the axial direction of the pipe against the pipe Attaching a second jig, filling the opening of the frame with a curable sealant in a state in which the first jig and the second jig are attached, and the sealant. A step of closing the opening of the frame body filled with a lid with a lid, a step of curing the sealing agent after the step of closing the lid with the lid, and a step of curing the sealing agent after the step of curing the sealing agent. And a detaching step.

When the first jig and the second jig are attached, the frame body is fixed to the pipe, so that a manual operation for pressing the frame body becomes unnecessary. Therefore, even when the piping is installed in a narrow place, workability can be ensured and the piping can be repaired easily.
When the first jig and the second jig are attached, the opening edge of the frame in the circumferential direction and the axial direction of the pipe is pressed against the pipe, so that the opening edge is prevented from floating from the outer peripheral surface of the pipe. . Therefore, the sealant filled in the opening is prevented from leaking into the gap between the frame body and the outer peripheral surface of the pipe, and an amount of sealant necessary for sealing can be retained in the opening.
Since the opening of the frame body filled with the sealing agent is closed with a lid, the space between the lid, the frame body and the outer peripheral surface of the pipe is densely resisted against the pressure of the fluid leaking from the defect. Filled. Thereby, it is prevented that a gap is generated in the cured sealant, and the cured sealant covers the defect without a gap, so that leakage of fluid can be stopped.
Since the opening is closed with a lid before the sealant is cured, the shape and dimensions of the cured sealant are controlled with high accuracy. Moreover, since a frame and a lid | cover are removed, the sealing agent after hardening can be processed easily.

The pipe repair method according to the present invention can take the following modes as typical modes.
The second jig has a first contact portion that contacts one of a pair of opening edge portions sandwiching the opening in the circumferential direction of the pipe, and a second contact portion that contacts the other, The first contact portion and the second contact portion may be urged in a direction toward the outer peripheral surface of the pipe in a state where the second jig is attached to the pipe.

  If it does in this way, since a 1st contact part and a 2nd contact part press a frame by urging | biasing force, it is prevented that a frame floats from the outer peripheral surface of piping.

  In the step of filling the sealant, the sealant may be applied from the outer periphery of the opening toward the defect. In this case, in the step of filling the sealant, it is preferable to apply the sealant while sucking a fluid leaking from the defect.

If the sealing agent is applied from the outer periphery of the opening toward the defect, the fluid leaking from the defect is reduced from being mixed into the sealing agent on the outer peripheral side. If the fluid leaking from the defect is sucked, the fluid is removed from the outer peripheral surface of the pipe, so that the leaked fluid is reduced from being mixed into the sealant.
As described above, the fluid is not mixed into the sealing agent on the outer peripheral side, so that a gap due to the mixing of the fluid in the sealing agent on the outer peripheral side is prevented. Therefore, even if a gap is generated in the vicinity of the defect, fluid leakage can be stopped by the sealing agent on the outer peripheral side.

In the step of filling the sealant, the sealant is cured so that the degree of cure of the sealant filled in the opening on the outer peripheral side of the opening is higher than the degree of cure near the defect. It is good to manage the degree.
In this way, the degree of cure of the sealant is relatively higher on the outer peripheral side than in the vicinity of the defect, so that it is difficult for fluid to enter the sealant on the outer peripheral side. Even when a gap due to the mixing of fluid occurs in the sealant near the defect, the fluid that passes through this gap and goes to the outside of the sealant can be stopped by the sealant on the outer peripheral side, thereby preventing fluid leakage. Can do.

In the step of closing with the lid, a curable second sealing agent is disposed in a portion of the lid that covers the defect, and the second sealing agent is cured to a degree of curing that does not mix with fluid leaking from the defect. The opening may be closed with the lid after curing.
In this way, since the second sealant does not mix with the fluid leaking from the defect, it is prevented that a gap is formed in the second sealant after curing, and the fluid leaks at the portion covering the defect. Can be prevented.

The second sealant may be chemically bonded to the sealant.
If it does in this way, it will become difficult to make an interface between sealing agent and the 2nd sealing agent, and it will be prevented that a crevice is generated in an interface.

The sealing agent may be a reaction curable type.
If it does in this way, it will prevent that the clearance gap by the volatile gas of a solvent arises in sealing agent.

In the frame body, the opening may be substantially rectangular in a state where the frame body is developed in a flat plate shape.
In this way, the opening edge corresponding to one side of the rectangle can be along the circumferential direction of the pipe, and the opening edge corresponding to the other side of the rectangle can be along the axial direction of the pipe. Accordingly, the opening edge corresponding to one side can be pressed with the first jig, and the opening edge corresponding to the other side can be pressed with the second jig. Therefore, the frame body can be pressed in correspondence with the shape of the outer peripheral surface, and the frame body is prevented from floating from the outer peripheral surface of the pipe.

The frame body may be made of silicone rubber.
If the frame is mainly composed of silicone rubber, it is easy to cause the frame to follow the outer peripheral surface of the pipe. Moreover, since silicone rubber has easy peelability with respect to a normal adhesive agent, it becomes easy to remove a frame.

In the step of closing with the lid, after covering the opening with the lid, a third jig for pressing the lid in a direction toward the outer peripheral surface of the pipe may be attached.
If it does in this way, a sealing agent will be pressurized through a lid | cover and it will prevent producing a gap | interval in a sealing agent. Further, the space occupied by the sealant before completion of curing can be regulated with high accuracy, and the shape and dimensions of the sealant after curing can be controlled with high accuracy.

When the pipe has a bent portion and the defect occurs in the vicinity of the bent portion, after using a belt as the third jig and fixing an anchor at a predetermined position with respect to the pipe The belt may be hooked on the anchor to develop tension on the belt, and the lid at the bent portion may be pressed by the belt.
In this way, the direction in which the belt presses the lid can be controlled by the anchor fixing position, and the lid can be pressed along the bent portion of the pipe.

When the pipe has a bent portion and the defect is generated in the vicinity of the bent portion, the shape of the frame is selected so that at least the opening edge of the frame is along the surface of the bent portion. Good. In this case, it is preferable that a notch be provided in the outer peripheral portion on the opposite side of the opening of the frame body.
If it does in this way, since at least the opening edge part of a frame body follows the surface of a bending part, it will prevent that a sealing agent leaks out between a frame body and piping. Moreover, if the notch is provided in the outer peripheral part on the opposite side to the opening of the frame body, the distortion of the frame body can be reduced by the notch, and the frame body can be easily along the surface of the bent part.

  In the present invention, the defect can be easily sealed with a sealant while the fluid is circulating in the pipe, and the operation of part or all of the facility where the pipe is installed is stopped. In addition, the function of the piping can be normalized. Moreover, since the sealing agent which seals the defect is formed in a highly accurate shape and size, the cured sealing agent can be easily processed. Therefore, additional repairs and re-repairs can be easily performed, and the piping can function normally over a long period of time. As described above, according to the present invention, it is possible to efficiently operate a facility where piping is installed.

It is a perspective view, a side sectional view, and an axial sectional view showing an example of straight pipe type piping. It is a flowchart which shows the process of the piping repair method of 1st Embodiment. It is a perspective view which shows a frame arrangement | positioning process, a side sectional view, and an axial sectional view. It is a perspective view, a side sectional view, and an axial sectional view showing a frame fixing process. It is a perspective view which shows a sealing agent filling process, a side sectional view, and an axial sectional view. It is a perspective view, a side sectional view, and an axial sectional view showing a closing process. It is a perspective view which shows a frame body removal process, a side sectional view, and an axial sectional view. It is a perspective view which shows schematic structure of the 2nd jig | tool in 1st Embodiment. It is a perspective view which shows the frame arrangement | positioning process of 2nd Embodiment. It is a perspective view, a side sectional view, and an axial sectional view showing an example of a bent pipe. It is a perspective view which shows the frame arrangement | positioning process of 2nd Embodiment. It is a perspective view which shows the frame fixing process of 2nd Embodiment. It is a perspective view which shows the lid closing process of 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings used for explanation, in order to show characteristic parts in an easy-to-understand manner, dimensions and scales of structures in the drawings may be different from actual structures. In the embodiment, the same components are illustrated with the same reference numerals, and detailed description thereof may be omitted.

[First Embodiment]
1A is a perspective view schematically showing the pipe 1 in which the defect 10 is generated, and FIG. 1B is a side cross-sectional view A1 including the defect 10 and the central axis of the pipe 1 in the vicinity of the defect 10. FIG. 1C is an enlarged view, and FIG. 1C is an enlarged view showing the vicinity of the defect 10 in the axial section A2 including the defect 10 and orthogonal to the central axis of the pipe 1.

  As shown in FIGS. 1A to 1C, the pipe 1 targeted in the first embodiment is a straight pipe type. A fluid F such as water circulates in the pipe 1. The pipe 1 has a cylindrical shape, and the cross-sectional shape of the pipe 1 in a plane orthogonal to the axial direction D1 is a substantially ring shape. The circumferential direction D2 is a direction along the outer periphery of the ring. The pipe repairing method of the present invention can be applied to pipes having an arbitrary cross-sectional shape and bent pipes such as a T-shape and an L-shape in addition to a cylindrical straight pipe-type pipe. A pipe repair method for bent pipes will be described in a second embodiment.

  The defect 10 penetrates the wall surface of the pipe 1 and has an opening on the outer peripheral surface 11. The defect 10 is, for example, a crack generated when the pipe 1 is fatigued due to repeated stress due to a pressure fluctuation of the fluid F, or a pit generated when the pipe 1 is corroded by the fluid F. When the fluid F circulates in the pipe 1 in a state where the defect 10 is generated, a part of the fluid F leaks to the outside of the pipe 1 through the defect 10. In the present invention, the defect 10 is sealed to repair the piping in order to stop leakage. 1A to 1C show the defect 10 in an exaggerated manner. It is preferable to repair the pipe at a stage where the defect 10 has a small diameter and the fluid F does not eject from the defect 10.

  FIG. 2 is a flowchart showing the steps of the pipe repair method of the first embodiment, FIGS. 3 to 8 are step diagrams showing the steps of the pipe repair method, and FIGS. 9A and 9B are views of the second repair. It is a figure which shows schematic structure of a tool. 3 to 7, (a) is a perspective view, (b) is a side sectional view, and (c) is an axial sectional view. In the following description, refer to FIG. 1 for the direction related to the pipe 1 and FIG. 3 for the partial name of the frame 2 as appropriate.

  As shown in FIG. 2, the pipe repair method of the first embodiment includes a frame body arranging step S1, a frame body fixing step S2, a sealant filling step S3, a closing step S4, a sealant curing step S5, and a frame body. -Lid removal process S6 is included. In the first embodiment, the defect 10 of the pipe 1 is sealed as follows. The frame body is fixed to the pipe 1 in the frame body arranging step S1 and the frame body fixing step S2, and the curable sealing agent is applied in the opening of the frame body in the sealing agent filling step S3. Then, after closing the opening of the frame with a lid in the lid closing step S4, the sealant is cured in the sealant curing step S5, and then the lid and the frame are removed in the frame / lid removing step S6. Hereinafter, each step will be described in detail.

  As shown in FIG. 3, in the frame body arrangement step S <b> 1, the frame body 2 is arranged so as to surround the defect 10 on the outer peripheral surface 11 of the pipe 1. The frame 2 is made of an elastomer such as a soft resin or rubber, and can be easily deformed by human power or the like. Here, a frame body 2 mainly composed of silicone rubber is employed. As the frame body, additives such as a curing agent may be added to the silicone rubber to adjust the characteristics such as elasticity (Young's modulus), corrosion resistance, heat resistance, and durability of the frame body.

  The frame 2 has an opening 20. The inner dimension of the opening 20 is selected according to the covering area of the sealing agent on the outer peripheral surface 11. The larger the covering area, the lower the probability that when the gap is generated at the interface between the pipe 1 and the cured sealant, the gap leads to the outside of the sealant and becomes a leak path. The smaller the covering area, the easier the construction. From this point of view, the inner dimension of the opening 20 is selected such that the distance L from the defect 10 to the end of the opening 20 in a state where the frame body 2 is in close contact with the outer peripheral surface 11 is 10 mm or more and 100 mm or less. In particular, the distance L is more preferably selected to be 25 mm or more and 50 mm or less. The shape of the opening 20 may be any of a polygon, an ellipse, and a combination of these in a state where the frame 2 is developed on a flat plate, but a substantially rectangular shape is employed here.

  In order to arrange the frame body 2, the frame body 2 is aligned with the pipe 1 so that the defect 10 is located in the opening 20, and the frame body 2 is made to follow the outer peripheral surface 11. It is deformed and brought into close contact with the outer peripheral surface 11. Since the opening 20 is substantially rectangular, when one side of the opening 20 is along the axial direction D1, the other side of the opening 20 is along the circumferential direction D2. In the frame body 2 arranged on the outer peripheral surface 11, a portion (opening edge portion 21) positioned in the vicinity of the opening 20 extends in the axial direction D1 and the first extending portion 21a extending in the circumferential direction D2. Second extending portion 21b. For example, the opening edge 21 is a portion located closer to the opening 20 than the center line between the outer periphery of the frame 2 and the outer periphery of the opening 20.

As shown in FIG. 4, in the frame body fixing step S <b> 2, the first jigs 3 a and 3 b and the second jig 4 are attached to the pipe 1 and the frame body 2 is pressed and fixed to the pipe 1.
1st jig | tool 3a, 3b is a jig | tool which presses the opening edge part 21 of the frame 2 of the part along the circumferential direction D2, for example, consists of a belt etc. In order to attach the first jig 3a, first, the pipe 1 extends over the first extending portion 21a and the outer peripheral surface 11 with respect to one of the pair of first extending portions 21a sandwiching the opening 20 in the axial direction D1. The first jig 3a is wound in the circumferential direction D2. Then, the first jig 3a is attached by closing the ring, tightening and binding the first jig 3a (hereinafter sometimes referred to as fastening). Further, the first jig 3b is attached to the other of the first extending portions 21a in the same manner as the first jig 3a. Thereby, the opening edge parts 21 on both sides sandwiching the opening 20 in the axial direction D1 are pressed against the pipe 1 over substantially the entire width in the circumferential direction D2.

  The 2nd jig | tool 4 is a jig | tool which presses the opening edge part 21 of the frame 2 of the part along the axial direction D1. As shown in FIG. 9A, the second jig 4 includes a first contact part 41, a second contact part 42, and a support part 43. The first contact portion 41 and the second contact portion 42 are portions that contact one of the pair of second extending portions 21b that sandwich the opening 20, respectively. The support portion 43 is a portion that supports and biases the first contact portion 41 and the second contact portion 42.

  The second jig 4 of the present embodiment is formed by bending a wire made of an elastic material such as metal, and the first contact portion 41 and the second contact portion 42 support portion 43 are integrally formed. It has become. The shape of the support portion 43 is roughly an annular shape with a part opened. The first contact portion 41 is continuous with one end of the ring of the support portion 43, and the second contact portion 42 is continuous with the other end. The 1st contact part 41 and the 2nd contact part 42 are extended in the normal line direction of the surface direction where the ring of the support part 43 extends. The length of the first contact portion 41 and the second contact portion 42 is approximately the same as the dimension of the opening 20 corresponding to the axial direction D1.

  To attach the second jig 4, the first contact part 41 and the second contact part 42 are separated from each other in the direction in which the inner diameter of the support part 43 increases. Then, the portion where the support portion 43 is opened and the opening 20 are made to correspond to each other so that the support portion 43 does not cover the opening 20, and the second jig 4 is disposed surrounding the pipe 1. Then, the first contact portion 41 is brought into contact with one of the pair of second extending portions 21b sandwiching the opening 20 in the circumferential direction, and the second contact portion 42 is brought into contact with the other. When the force that separates the first contact portion 41 and the second contact portion 42 is removed, an elastic repulsion force appears in the direction in which the support portion 43 is reduced in diameter, and the first contact portion 41 and the second contact portion are caused by the elastic repulsion force. The contact part 42 is biased. By this urging force, the opening edge portions 21 on both sides sandwiching the opening 20 in the circumferential direction D2 are pressed against the pipe 1 over substantially the entire width in the axial direction D1.

Thus, since the opening edge 21 is pressed independently in the axial direction D1 and the circumferential direction D2, the opening edge 21 can be pressed in a direction toward the outer peripheral surface 11 with respect to the outer peripheral surface 11 which is a curved surface. The opening edge 21 is prevented from floating from the outer peripheral surface 11.
Since the first jigs 3a and 3b and the second jig 4 are attached so as not to block the opening 20, it becomes easy to perform the work on the inside of the opening 20 in a later step.
Since the first contact portion 41 and the second contact portion 42 are made of a wire and have a cylindrical shape, the contact area with the frame body 2 is smaller than that having a contact surface along the outer peripheral surface 11. . Therefore, the stress which presses the frame 2 becomes large, and it is prevented that the opening edge part 21 lifts from the outer peripheral surface 11. FIG.

  In addition, as a 2nd jig | tool, if the opening edge part of the part extended to the axial direction D1 is pressed in the state in which at least one part of the opening 20 is exposed, it can change suitably about the structure. For example, you may use the 2nd jig | tool 4B shown in FIG.9 (b). The second jig 4B has a substantially scissor shape. The second jig 4B has an arm 45 including a first contact portion 41B and an arm 46 including a second contact portion 42B. The arms 45 and 46 are joined to each other by a pin or the like at the joint 43B, and can be rotated (opened / closed) with the joint 43B as a fulcrum. A portion between the joint portion 43B and the first contact portion 41B and a portion between the joint portion 43B and the second contact portion 42B have an annular shape with a part opened. The second jig 4 </ b> B is arranged so that the ring-shaped portion surrounds the pipe 1 with the opened portion corresponding to the opening of the frame body 2. The end of the arm 45 opposite to the first abutting portion 41B with respect to the joint 43B and the end of the arm 46 opposite to the second abutting portion 42B with respect to the joint 43B are biased by a spring or the like, respectively. It is connected to the section 44B. These end portions are urged away from each other by the urging portion 44B. With such a configuration, the first abutting portion 41B and the second abutting portion 42B are biased in a direction in which the inner diameters of the annular portions of the arms 45 and 46 are contracted while being attached to the pipe 1.

  Also, unlike the second jigs 4 and 4B, a second jig that covers a part of the opening 20 can be used. For example, as the second jig, a belt and a band such as a wire and a contact plate are used. The contact plate is brought into contact with the opening edge of the portion extending in the axial direction D1. And a belt is wound around the circumferential direction D2 over a backing plate and the piping 1, and it fastens. Thereby, a belt | band | zone covers a part of opening and presses a backing plate, and a backing plate presses the opening edge part of a frame. By selecting the width of the band so that the opening is exposed to the extent that the sealing agent can be applied in the opening, there is no problem in the sealing agent filling step S3 described below.

As shown in FIG. 5, in the sealing agent filling step S3, the opening 20 of the frame 2 is filled with a curable sealing agent Q1.
As the curable sealant, a material exhibiting corrosion resistance to the fluid F can be appropriately selected and used, and a reaction curable sealant that cures when the composition reacts may be used. . Examples of the reactive curable sealant include a two-component reactive adhesive, a thermosetting resin, and a photocurable resin. With such a curable sealant, almost no volatile gas is generated in the solvent, so that a gap due to the volatile gas is prevented from being generated in the sealant.

  In the present embodiment, an epoxy two-component reactive adhesive is used as the reactive curable sealant Q1. The two-component reactive adhesive has a higher degree of polymerization and a higher degree of curing with the passage of time after mixing the two components. Therefore, the degree of cure can be controlled by time management, and since an appliance for curing is not necessary, it can be easily constructed.

  In order to apply the sealant Q1, the fluid F leaked from the defect 10 is sucked by the pump 90 or the like, and the fluid F on the outer peripheral surface 11 is removed. Further, while removing the fluid F, the sealant Q1 is applied into the opening 20 by the dispenser 91 or the like. Here, the sealing agent Q1 is spirally applied along the application direction D3, that is, from the outer periphery of the opening 20 toward the defect 10. Since the opening 20 is exposed to the outside, it is possible to work while confirming the state of the applied sealing agent Q1 and the like, and the opening 20 can be satisfactorily filled with the sealing agent Q1. Thereby, the sealing agent Q1 can be applied evenly, and a portion with a relatively low filling degree is less likely to occur in the sealing agent Q1 as compared with the case where the sealing agent is filled in a closed space.

  The opening edge 21 of the frame 2 is pressed over substantially the entire circumference of the opening 20, and the opening edge 21 is prevented from being lifted from the outer peripheral surface 11. Therefore, the sealant Q1 is prevented from leaking between the frame 2 and the outer peripheral surface 11, and the amount of sealant Q1 necessary for sealing can be retained in the opening 20.

  Since the fluid F is removed from the outer peripheral surface 11, it is reduced that the fluid F mixes with the applied sealing agent Q1. Since the coating is applied from the outer periphery of the opening 20 toward the defect 10, the probability of encountering the fluid F becomes lower as the sealant Q <b> 1 applied at a position away from the defect 10 is reduced. Mixing the fluid F into the stopper Q1 is significantly reduced.

  Thus, since the fluid F is reduced from being mixed into the applied sealant Q1, the formation of a gap by the mixed fluid F is reduced. In particular, the mixing of the fluid F into the sealing agent Q1 on the outer peripheral side of the opening 20 is significantly reduced, and a gap is prevented from being generated in the outer peripheral portion of the sealing agent Q1. Even if there is a gap near the defect 10, the fluid F passing through the gap is blocked by the outer periphery of the sealant Q 1, so that the fluid F extends outside the sealant Q 1 along the surface direction of the outer periphery 11. Leakage is prevented.

Further, in order to prevent fluid from being mixed particularly in the sealing agent Q1 at the outer peripheral portion, a method of managing the curing degree of the sealing agent so that the curing degree at the outer peripheral portion is higher than the curing degree near the defect. Is also effective. Examples of a method for relatively increasing the degree of curing of the sealant at the outer peripheral portion include the following four methods.
In the first method, two two-component reactive adhesives having different curing start times are prepared by changing the timing of mixing the two components. Then, the one having a relatively early curing start time is applied to the outer peripheral side in the opening, and the one having a relatively later curing start time is applied on the defect and in the vicinity of the defect.
In the second method, two two-component reactive adhesives having different curing rates are prepared. Then, the relatively faster curing rate is applied to the outer peripheral side in the opening, and the relatively slower curing start time is applied on the defect and in the vicinity of the defect.
In the third method, after the two-component reactive adhesive is applied to the outer peripheral side in the opening, the applied two-component reactive adhesive is heated to accelerate the curing reaction of this portion. Then, a liquid reaction type adhesive is applied on the defect and in the vicinity of the defect.
In the fourth method, the degree of cure is managed by appropriately combining two or more of the first to third methods.

As shown in FIG. 6, in the lid closing step S <b> 4, the opening 20 of the frame body 2 filled with the sealing agent Q <b> 1 is closed with the lid 5 and the lid 5 is pressed and fixed to the pipe 1.
In order to close the opening 20 with the lid 5, the lid 5 is prepared during the lid closing step S4 or before the lid closing step S4. The lid 5 is made of, for example, the same material as that of the frame 2 and can be deformed. The lid 5 is of a size capable of closing the entire opening 20. Here, the dimension of the lid 5 corresponding to the axial direction D1 is equal to or smaller than the interval in the axial direction D1 of the first jigs 3a and 3b attached to the pipe 1.

  Before the lid 5 is attached to the frame body 2, a curable second sealing agent Q <b> 2 is provided on one surface of the lid 5. As a 2nd sealing agent, the thing of the material which shows corrosion resistance with respect to the fluid F can be selected suitably, similarly to sealing agent Q1. In addition, as the second sealant, it is preferable to use a reaction curable sealant from the viewpoint of preventing formation of a gap, and it is chemically bonded to the sealant Q1 by a reaction including a copolymerization reaction. Use a good one. The second sealant Q2 may have the same composition as the sealant Q1 or a different composition.

  Here, as the second sealing agent Q <b> 2, an appropriately selected reaction curable adhesive is provided on one surface of the lid 5 in the form of a sheet. At the stage of attaching the lid 5 to the frame body 2, the second sealing agent Q2 is cured so that it does not mix with the fluid F and is less than the degree of curing when the curing is completed. The degree of curing of agent Q2 is adjusted. For example, the degree of cure of the second sealant Q2 may be set to be equal to or greater than the maximum value of the degree of cure of the sealant Q1 filled in the opening 20. The degree of curing can be adjusted by managing the time after the second sealing agent Q2 starts to cure.

  When the same two-component reactive adhesive as the sealant Q1 is used as the second sealant, the second sealant reacts with the sealant Q1 to become substantially integrated, and the second after curing is cured. It becomes difficult to form an adhesive interface between the sealant and the sealant Q1.

  After the lid 5 provided with the second sealing agent Q2 as described above is prepared and the second jig 4 is removed, the lid 5 is quickly attached to the frame 2. The lid 5 is attached so that the second sealant Q2 covers the defect 10 and so that the lid 5 fits between the first jigs 3a and 3b. When the degree of cure of the outer peripheral portion of the sealant Q1 in the opening 20 is relatively high, the sealant Q1 leaks between the frame 2 and the outer peripheral surface 11 even when the second jig 4 is removed. Hateful.

  In addition, you may attach a lid | cover so that it may overlap with 1st jig | tool 3a, 3b. In this case, if the lid of the part overlapping the first jigs 3a and 3b is made thinner than the thickness of the first jigs 3a and 3b, and this part is used as the relief part of the first jigs 3a and 3b. Good. It is also possible to attach the lid 5 with the second jig 4 attached. In this case, it is preferable to attach a lid so as not to overlap the second jig 4, or to provide a relief portion of the second jig 4 on the lid that overlaps the second jig 4. In any case, it is only necessary that the gap between the surface of the lid facing the outer peripheral surface 11 and the outer peripheral surface 11 can be managed.

  As shown in FIG. 7, in the lid closing step S <b> 4 of the present embodiment, after the lid 5 is attached to the frame body 2, third jigs 6 a and 6 b that press the lid 5 against the pipe 1 are attached. The third jigs 6a and 6b are made of, for example, a belt similar to the first jigs 3a and 3b. After the third jigs 6a and 6b are wound in the circumferential direction D2 of the pipe 1 over the lid 5, the frame body 2 and the outer peripheral surface 11, the third jigs 6a and 6b are respectively fastened. 3 Fix the jigs 6a and 6b. Thereby, sealing agent Q3 (sealing agent Q1 and 2nd sealing agent Q2) with which the part enclosed by the outer peripheral surface 11, the frame 2, and the lid | cover 5 was filled is pressurized, and sealing agent Q3 is It is filled against the fluid F leaking from the defect 10. If the second jig is an obstacle to the attachment of the third jig, the second jig 4 may be removed before attaching the third jigs 6a and 6b as in the present embodiment.

  In the sealing agent curing step S <b> 5, the sealing agent Q <b> 3 filled in the portion surrounded by the outer peripheral surface 11, the frame body 2, and the lid 5 is cured. Generally, since the two-component adhesive has a shorter curing time than the solvent-type adhesive or the like, the fluid F is reduced from being mixed into the sealing agent Q3 in the curing process, and the formation of a path due to the mixing of the fluid F is reduced. The

  Since the second sealing agent Q2 is cured to the extent that it does not mix with the fluid F when the lid 5 is attached, it is possible to prevent the second sealing agent Q2 from generating a gap due to mixing of the fluid F. . Therefore, even if the fluid F is mixed with the sealant Q1 in the vicinity of the defect 10 and a gap is formed, the second sealant Q2 is disposed closer to the lid 5 than the sealant Q1, The leakage of the fluid F can be stopped by the second sealant Q2.

  Further, since the sealing agent Q3 is densely filled by pressing the lid 5, it is possible to prevent a gap from being generated in the cured sealing agent Q3.

  Since the opening 20 is closed with the lid 5, the thickness of the filled sealing agent Q3 (total thickness of the sealing agent Q1 and the second sealing agent Q2) is the gap between the lid 5 and the outer peripheral surface 11, or It is regulated by the thickness of the frame 2. Therefore, the thickness of the sealing agent Q3 after curing can be controlled with high accuracy.

  The shape of the surface in contact with the lid 5 in the cured sealant Q3 is regulated by the surface shape of the lid 5. Therefore, the surface shape of the cured sealant Q3 can be controlled with high accuracy, and the unevenness on the surface of the cured sealant Q3 can be reduced.

As shown in FIG. 8A, in the frame / lid removing step S <b> 6, the frame 2 and the lid 5 are removed and removed from the pipe 1. Specifically, after removing the first jigs 3a and 3b and the third jigs 6a and 6b, the lid 5 is removed. And the predetermined | prescribed part which coat | covers the defect 10 among the hardened | cured sealing agent Q3 is made into the sealing part Q5, and the excess part Q4 and the frame 2 outside the sealing part Q5 are removed. Here, the surplus portion Q4 is cut out together with the frame 2 and removed from the outer peripheral surface 11 by an ultrasonic cutter 92 or the like so as not to damage the pipe 1. Between the frame body 2 and the lid 5, sealants Q1 and Q2 that exceed the amount necessary for sealing may overflow. The portions where the overflowing sealants Q1 and Q2 are cured are included in the surplus portion Q4. Since the surplus portion Q4 is removed, the outer shape of the sealing portion Q5 can be controlled with high accuracy.
As described above, as shown in FIG. 8B, the sealing portion Q5 that seals the defect 10 of the pipe 1 can be formed, and the leakage of the fluid F from the defect 10 is prevented by the sealing portion Q5. Can be stopped.

  In the piping repair method according to the first embodiment, the frame body 2 is pressed in the axial direction D1 and the circumferential direction D2 in the frame body fixing step S2, so that the frame body 2 corresponds to the shape of the outer peripheral surface 11. The opening edge 21 of the frame body 2 is prevented from being lifted from the outer peripheral surface 11. Therefore, the sealing agent Q1 is prevented from leaking between the frame 2 and the outer peripheral surface 11 in the sealing agent filling step S3, and an amount of the sealing agent Q1 necessary for sealing is kept in the opening 20. Can do.

  In the sealing agent filling step S3, the fluid F is prevented from being mixed into the sealing agent Q1 and the second sealing agent Q2. In the lid closing step S4, the opening 20 is closed with the lid 5 and the lid 5 is pressed to pressurize the sealing agent Q3. Thereby, it is prevented that a gap is generated in the sealant Q3, and the defect 10 can be sealed with the sealant Q3 cured in the sealant curing step S5. The thickness of the sealant Q3 is defined with high accuracy by the lid 5, and the occurrence of unevenness on the surface of the sealant Q3 is significantly reduced. Accordingly, the thickness of the cured sealant Q3 can be set to a desired value, and the surface shape of the cured sealant Q3 can be set to a desired shape.

  Since the frame 2 and the lid 5 are removed in the frame / lid removal step S6, the cured sealant Q3 is exposed to the outside, and the sealant Q3 can be easily processed. Since the surface shape and thickness of the sealant Q3 are controlled with high accuracy, the sealant Q3 can be easily processed. In particular, if the surplus portion Q4 in the sealant Q3 is removed, the outer shape of the sealing portion Q5 can be changed to a desired shape. Thereby, for example, it becomes possible to standardize the external shape and dimensions of the sealing portion Q5, and it is possible to use standardized jigs and construction methods when performing additional repair or re-repair on the pipe 1. Become.

  According to the pipe repair method of the first embodiment, the defect 10 can be easily sealed with the sealing portion Q5 while the fluid F is circulating in the pipe 1. Therefore, the function of the pipe 1 can be normalized without stopping the operation of part or all of the facility where the pipe 1 is installed. Since the sealing portion Q5 that seals the defect 10 is formed in a highly accurate shape and size, the pipe 1 can be easily repaired or repaired again. Therefore, it is possible to cause the piping 1 to function normally over a long period of time, and it is possible to efficiently operate the facility where the piping 1 is installed.

[Second Embodiment]
Next, a pipe repair method according to the second embodiment will be described. The second embodiment is different from the first embodiment in that the T-shaped pipe is repaired.

FIG. 10A is a perspective view showing a pipe 7 to be repaired in the second embodiment, and FIG. 10B is a side view of the pipe 7.
As shown in FIGS. 10A and 10B, the pipe 7 includes a first cylindrical portion 71, a second cylindrical portion 72, and a bent portion 73. The first cylindrical portion 71 has a straight tube cylindrical shape extending in the axial direction D4. The outer peripheral surface 74 of the first cylindrical portion 71 is a curved surface along the circumferential direction D5. The second cylindrical portion 72 has a straight tube cylindrical shape extending in the axial direction D6. The outer peripheral surface 75 of the second cylindrical portion 72 is a curved surface along the circumferential direction D7. Here, the axial direction D4 is substantially orthogonal to the axial direction D6. The first cylindrical portion 71 and the second cylindrical portion 72 are connected by a bent portion 73.

  Defects 70 such as pits and cracks are generated in the vicinity of the bent portion 73. When the defect 70 is located in the vicinity of the bent portion 73 and the covering area by the sealant is determined in order to seal the defect 70 satisfactorily, sealing is performed across the first cylindrical portion 71 and the second cylindrical portion 72. It may be necessary to provide an agent. In the second embodiment, a case where a sealant is provided across the bent portion 73 will be described. In addition, in the pipe including the bent portion, when the sealant is provided only in the straight pipe portion, the pipe repair method of the first embodiment may be employed.

  FIGS. 11-13 is process drawing which shows schematically the piping repair method of 2nd Embodiment. Fig.11 (a) is a side view which shows frame body arrangement | positioning process S1, FIG.11 (b) is a top view which shows an example of a frame. FIG. 12 is a side view showing the frame fixing step S2. FIG. 13 is a side view showing the closing step S4. 11A, 12 and 13 are plan views of the pipe 7 viewed from the normal direction of the plane including the axial directions D4 and D6. The XYZ orthogonal coordinate system shown in FIG. This corresponds to a plan view of the YZ plane viewed from the positive X direction. The pipe 7 is substantially plane-symmetric with respect to a plane (YZ plane) including the central axis of the first cylindrical portion 71 and the central axis of the second cylindrical portion 72. The plan view of the pipe 7 as viewed from the X negative direction is the same as FIG. 11A, FIG. 12 and FIG. In the following description, refer to FIG. 10 for the direction related to the piping 7 and refer to FIG. 11 for the partial name of the frame 2B as appropriate.

  A frame 2B shown in FIG. 11B can be deformed with silicone rubber as a main material, for example, as in the first embodiment. The frame body 2 </ b> B includes first extending portions 22 and 24, second extending portions 23 and 25, and a bending portion 26. The first extending portions 22, 24, the second extending portions 23, 25, and the curved portion 26 are continuously formed into an annular body, and a portion surrounded by the annular body is an opening 20B. The shape of the opening 20 </ b> B is set so that at least the opening end is in close contact with the pipe 7 in a state where the frame 2 </ b> B is in close contact with the pipe 7.

  As shown in FIG. 11A, the first extending portion 22 is a portion extending in the circumferential direction D5 of the first cylindrical portion 71, and the second extending portion 23 is the axial direction D4 of the first cylindrical portion 71. It is a part that extends. The first extending portion 24 is a portion extending in the circumferential direction D7 of the second cylindrical portion 72, and the second extending portion 25 is a portion extending in the axial direction D6 of the second cylindrical portion 72. The curved portion 26 is a portion that is continuous with the second extending portion 23 and is continuous with the second extending portion 25. A cutout 27 is provided in the outer peripheral portion which is the end opposite to the opening 20 </ b> B in the curved portion 26.

  To attach the frame 2B to the pipe 7, the frame 2B is positioned so as to surround the defect 70, and the frame 2B is brought into close contact with the pipe 7 while being deformed. When it is difficult to make the entire surface of the frame 2B follow the surface of the pipe 7, the frame 2B is deformed so that at least the opening end of the frame 2B follows the surface of the pipe 7. If the frame is shaped like the frame 2 of the first embodiment, for example, the outer periphery of the frame may be distorted. In the frame 2 </ b> B, the opening edge has a shape that follows the surface of the pipe 7, and the distortion of the outer peripheral portion can be absorbed by the notch 27. Therefore, the shape of the opening 20 </ b> B is distorted and a part of the frame 2 </ b> B is prevented from floating from the surface of the pipe 7.

  As shown in FIG. 12, in the frame body fixing step S2, the first jigs 3a, 3b and the second jig 4C are attached, and the frame body 2B is pressed and fixed to the pipe 7. The first jigs 3a and 3b are the same as those in the first embodiment. To attach the first jig 3a, the first jig 3a is wound and fastened in the circumferential direction D5 of the first cylindrical portion 71 over the outer peripheral surface 74 and the first extending portion 22. To attach the first jig 3b, the first jig 3b is wound and fastened in the circumferential direction D7 of the second cylindrical portion 72 over the outer peripheral surface 75 and the first extending portion 24.

  The second jig 4C includes a pressing plate 40C and support portions 41C, 42C, and 43C. The pressing plate 40C is made of, for example, a metal plate, and is processed into a surface shape along the surface of the pipe 7 in the vicinity of the opening 20B. The support portions 41C, 42C, and 43C are annular ones that are made of an elastic material and partially open, like the support portion 43 (see FIG. 9A) of the second jig 4 in the first embodiment. is there.

To attach the second jig 4 </ b> C, the pressing plate 40 </ b> C is disposed in contact with the second extending portions 23 and 25 and the curved portion 26 at the opening edge of the opening 20. In FIG. 12, one side of the pipe 7 is illustrated, but the pressing plate 40 </ b> C is also arranged on one side (not shown) of the pipe 7. And in the state which applied force so that the internal diameter of 41 C of support parts may spread, the edge part of the support part 41C is made to contact | abut to the press plate 40C in the part which does not cover the opening 20B in the circumferential direction D5 of the 1st cylindrical part 71. 41C is arranged. Here, after attaching support part 41C so that the edge part of support part 41C may be located on the 2nd extension part 23, the force added to support part 41C is removed. Similarly, the support portion 42C is attached so that the end portion of the support portion 42C is located on the second extending portion 25, and the support portion 43C is attached so that the end portion of the support portion 43C is located on the bending portion 26. . The support portions 41C, 42C, and 43C exhibit an elastic repulsion force in a direction in which the inner diameter is reduced, and the pressing plate 40C is urged by the elastic repulsion force to press the frame body 2B against the pipe 7.
After attaching the frame 2B as described above, the sealing agent filling step S3 is performed as in the first embodiment to apply a curable sealing agent in the opening 20B.

  As shown in FIG. 13, in the lid closing step S4, the lid 20B closes the opening 20B and presses and fixes the lid 5B to the pipe 7. Prior to attaching the lid 5B, a curable second sealant is provided on one side of the lid 5B, as in the first embodiment. The lid 5 </ b> B used in the second embodiment is provided with a notch similar to the frame body 2 </ b> B on the outer peripheral portion of the portion in contact with the bending portion 26. The lid 5B is configured to relieve the distortion of the outer peripheral portion with a notch while the opening 20B is closed and attached.

  After attaching the lid 5B, the third jigs 6a, 6b and 6c for pressing the lid 5B against the pipe 7 are attached. The third jigs 6a, 6b, and 6c are made of, for example, the same belt as in the first embodiment. The third jig 6a is attached by winding and fastening the third jig 6a in the circumferential direction D5 of the first cylindrical portion 71 over the lid 5B and the outer peripheral surface 74. Similarly, the third jig 6b is attached by winding and fastening the third jig 6b in the circumferential direction D7 of the second cylindrical portion 72 over the lid 5B and the outer peripheral surface 75.

  Further, the anchor 60 is fixed by fixing the relative position with respect to the pipe 7, the third jig 6 c is attached via the anchor 60, and the lid 5 </ b> B at the bent portion 73 is directed to the surface of the pipe 7 by the third jig 6 c. Press in the direction. The anchor 60 is made of, for example, metal, and includes a plurality of protrusions 61 arranged in a predetermined direction. In the present embodiment, the anchor 60 is fixed so that the protruding portions 61 are arranged in a direction substantially orthogonal to the axial direction D4 of the first cylindrical portion 71. And while passing the 3rd jig | tool 6c between the protrusion parts 61, the 3rd jig | tool 6c is made to contact | abut with the lid | cover 5B in the bending part 73. FIG. And the 3rd jig | tool 6c is fastened and tension | tensile_strength is expressed to the 3rd jig | tool 6c. Thereby, the lid 5B in the bent portion 73 is pressed by the third jig 6c. The direction of the force with which the third jig 6c presses the bent portion 73 is adjusted by adjusting the fixing position of the anchor 60 or by selecting which of the projections 61 the third jig 6c is passed between. be able to.

  After performing the closing step S4, the defect 70 of the pipe 7 can be sealed by performing the sealing agent curing step S5 and the frame / lid removing step S6 in the same manner as in the first embodiment.

In the pipe repair method of the second embodiment as described above, the function of the pipe 7 can be normalized without stopping the operation of part or all of the facility, as in the first embodiment.
Further, since the frame body 2B is fixed to follow the surface of the bent portion 73, the sealant is prevented from leaking into the pipe between the frame body 2B and the surface of the pipe 7. Since the lid 5B is pressed by following the surface of the bent portion 73, the sealing agent can be favorably pressed by the lid 5B. Since the cured sealant is thus formed with a highly accurate shape and dimensions, the cured sealant can be easily processed. As described above, according to the pipe repair method of the second embodiment, the pipe 7 having the bent portion 73 can be repaired satisfactorily.

  In addition, as piping which has a bending part, it can repair by applying this invention also to L-shaped piping other than T-shape, and piping where two axial directions are not orthogonal. Any anchor can be used as long as the position of the band can be adjusted by hooking the band, and a suction pad or the like can also be used.

DESCRIPTION OF SYMBOLS 1 ... Piping, 2 ... Frame, 2B ... Frame, 3a, 3b ... 1st jig | tool,
4, 4B, 4C ... second jig, 5, 5B ... lid, 6a, 6b, 6c ... third jig, 10 ... defect, 11 ... outer peripheral surface, 20, 20B ... Openings, 21 ... Open edges,
7 ... piping, 21a, 22, 24 ... 1st extension part, 21b, 23, 25 ... 2nd extension part,
26 ... curved portion, 27 ... notch, 40C ... holding plate,
41, 41B ... 1st contact part, 41C, 42C, 43, 43C ... support part,
42 and 42B ... 2nd contact part, 43B ... junction part, 44B ... biasing part,
45, 46 ... arms, 60 ... anchors, 61 ... projections, 70 ... defects,
71 ... 1st cylindrical part, 72 ... 2nd cylindrical part, 73 ... Bending part,
74, 75 ... outer peripheral surface, 90 ... pump, 91 ... dispenser,
92 ... ultrasonic cutter, A1 ... side cross section, A2 ... axial cross section,
D1 ... axial direction, D2 ... circumferential direction, D3 ... coating direction, D4 ... axial direction,
D5 ... circumferential direction, D6 ... axial direction, D7 ... circumferential direction, F ... fluid,
L ... distance, Q1 ... sealant, Q2 ... second sealant, Q3 ... sealant,
Q4 ... surplus part, Q5 ... sealing part, S1 ... frame body arrangement | positioning process,
S2 ... Frame body fixing step, S3 ... Sealant filling step, S4 ... Closing step,
S5 ... Sealant curing step, S6 ... Lid removal step

Claims (14)

A pipe repair method for sealing defects that cause leakage of fluid flowing through the pipe,
Arranging the frame so as to surround the defect on the outer peripheral surface of the pipe;
Attaching a first jig for pressing an opening edge of the frame body along the circumferential direction of the pipe against the pipe;
Attaching a second jig that presses the opening edge of the frame body along the axial direction of the pipe against the pipe;
Filling the opening of the frame with a curable sealant in a state where the first jig and the second jig are attached;
Closing the opening of the frame body filled with the sealing agent with a lid;
Curing the sealant after the step of closing with the lid;
And a step of removing the frame body and the lid after the step of curing the sealant.   The second jig has a first contact portion that contacts one of a pair of opening edge portions sandwiching the opening in the circumferential direction of the pipe, and a second contact portion that contacts the other, The first contact part and the second contact part are biased in a direction toward the outer peripheral surface of the pipe in a state where the second jig is attached to the pipe. The pipe repair method described.   The pipe repair method according to claim 1 or 2, wherein in the step of filling the sealant, the sealant is applied from the outer periphery of the opening toward the defect.   The pipe repairing method according to claim 3, wherein in the step of filling the sealant, the sealant is applied while sucking a fluid leaking from the defect.   In the step of filling the sealant, the sealant is cured so that the degree of cure of the sealant filled in the opening on the outer peripheral side of the opening is higher than the degree of cure near the defect. The pipe repair method according to any one of claims 1 to 4, wherein the degree is managed.   In the step of closing with the lid, a curable second sealing agent is disposed in a portion of the lid that covers the defect, and the second sealing agent is cured to a degree of curing that does not mix with fluid leaking from the defect. The pipe repair method according to claim 1, wherein the opening is closed with the lid after being cured.   The pipe repair method according to claim 6, wherein the second sealant is chemically bonded to the sealant.   The pipe repair method according to claim 1, wherein the sealant is a reaction curing type.   The pipe repair method according to any one of claims 1 to 8, wherein the opening of the frame is substantially rectangular in a state where the frame is expanded in a flat plate shape.   The pipe repair method according to claim 1, wherein the frame is made of silicone rubber.   In the step of closing with the lid, after covering the opening with the lid, a third jig for pressing the lid in a direction toward the outer peripheral surface of the pipe is attached. The pipe repair method according to one item. When the pipe has a bent portion and the defect occurs in the vicinity of the bent portion,
A belt is used as the third jig, and an anchor is fixed at a predetermined position with respect to the pipe, and then the belt is hooked on the anchor to develop tension, and the lid at the bent portion is attached to the belt. The piping repair method according to any one of claims 1 to 11, wherein the piping repair method is performed. When the pipe has a bent portion and the defect occurs in the vicinity of the bent portion,
The pipe repair according to any one of claims 1 to 8, and 10 to 12, wherein a shape of the frame is selected so that at least an opening edge of the frame is along a surface of the bent portion. Method.   The pipe repair method according to claim 13, wherein a notch is provided in an outer peripheral portion of the frame body opposite to the opening.

Images