JP2012000952A - Method for repairing pipe line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for repairing a pipe line capable of giving an earthquake-proof flexible structure to a connection and a seam of the pipe line.SOLUTION: The repairing method of the pipe line for repairing an attachment pipe 2 branching from the established main pipe 1 includes: a stage of working a resin absorbing material impregnated with a curable resin into a pipe, and attaching an attachment pipe lining material 10 composed of a multi-layered pipe whose inner circumference is covered with a cushioning material to a pressure bag 14; a stage of connecting the pressure bag 14 and an in-pipe working robot 15; a stage of moving the pressure bag 14 and the in-pipe working robot 15 in the established main pipe, and pressing a flange of the attachment pipe lining material 10 so as to fit the same to the inner surface of the pipe in the connection of the attachment pipe of the established main pipe; a stage of injecting compressed air or high pressure water into the pressure bag 14 to let the attachment pipe lining material 10 reversely protrude into the attachment pipe 2; and a stage of curing the resin with the attachment pipe lining material 10 pressed to the inner wall of the attachment pipe 2.

Description

  The present invention relates to a pipeline repair method, and more particularly, repairs waterworks pipes, sewer pipes, industrial waterways, agricultural waterways, etc., whose joints are damaged due to earthquakes, ground subsidence, or aging of packings, etc. The present invention relates to a pipeline repair method.

  Conventionally, due to earthquakes, land subsidence, or aging of the packing, pipe joints, especially in sewer pipes, the connecting pipes such as manholes and branch pipes and main pipes are damaged, causing leakage and groundwater. Intrusion sometimes occurred. As a method for coping with such an accident, Patent Document 1 discloses a branch pipe lining material and a pipe lining construction method capable of reliably joining and integrating the collar part of the branch pipe lining material and the main pipe lining material. Has been.

  The technique disclosed in Patent Document 1 repairs a sewage main pipe with an aged attachment pipe (branch pipe) that has problems such as water leakage, and reversely inserts a resin-impregnated main pipe lining material into the old main pipe. By heating and curing the resin-impregnated main pipe lining material against the inner wall of the main pipe, it is possible to form a joint integrated structure pipe between the buttock of the branch pipe lining material and the main pipe lining material in the old main pipe. is there. However, the joint part of the main pipe lining material and the collar part of the branch pipe lining material has an integral structure, but there is a problem in earthquake resistance because it is not a flexible structure. The sewer pipe connection between the manhole and the main pipe, the main pipe and the diversion pipe connection in the agricultural pipe canal, and the seam in the middle of the pipe are required to have a flexible structure for earthquake resistance. It has been.

JP-A-9-216284

  An object of the present invention is to provide a pipe line repairing method capable of providing a flexible structure having earthquake resistance at a connection part or a joint of a pipe line.

  A first pipeline repair method according to the present invention is a pipeline repair method for repairing a mounting pipe branched from an existing main pipe, wherein a resin absorbent material impregnated with a curable resin is processed into a tubular shape, and an inner periphery is processed. Attaching a mounting pipe lining material made of a multi-layer pipe covered with a cushion material to a pressure bag; connecting the pressure bag to an in-pipe work robot; and moving the pressure bag and the in-pipe work robot in the existing main pipe. A step of pressing a flange of the mounting pipe lining material in accordance with a pipe inner surface of a mounting pipe connecting portion of the existing main pipe, and injecting compressed air or high-pressure water into the pressure bag to attach the mounting pipe lining material A step of projecting and reversing the tube, and a step of curing the mounting tube lining material while being pressed against a tube inner wall of the mounting tube.

  The cushion material is made of a tubular non-woven fabric or a tubular rubber which is airtight by covering the inner and outer surfaces with a resin film.

  A second pipe line repairing method according to the present invention is a pipe line repairing method for repairing a mounting pipe branched from an existing main pipe, and is attached with a hook with a resin absorbent material impregnated with a curable resin into a tubular shape. Attaching a pipe lining material to a pressure bag; attaching a tubular cushion material to a ridge of the attachment pipe lining material; and drawing in advance from the existing main pipe toward the ground through the inside of the attachment pipe; and the pressure bag Connecting the in-pipe work robot, moving the pressure bag and the in-pipe work robot in the existing main pipe, and pressing the flange of the mounting pipe lining material in accordance with the pipe inner surface of the mounting pipe connection portion of the existing main pipe And injecting compressed air or high-pressure water into the pressure bag to project and reverse the mounting pipe lining material into the mounting pipe; and Characterized in that it comprises the steps of curing in a state pressed against the inner wall of the biasing tube, a.

  A third pipeline repairing method according to the present invention is a pipeline repairing method for repairing a joint portion between a manhole and an existing main pipe, wherein the joint portion between the manhole and the existing main pipe includes an inner peripheral wall and a bottom portion of the existing main pipe. Scraping the deteriorated layer on the surface of the invert, which is a concave groove provided on the surface, to secure a space for inserting the spacer, applying an epoxy resin primer on the cutting surface, and then applying an epoxy resin on the surface A step of covering, a step of inserting a tubular spacer in a cutting portion, a step of reversing and inserting a main lining material into an existing main pipe from a manhole different from the object to be repaired, and an inside of the reversed main lining material Pressurizing and pressing the main lining material against the inner wall and spacer of the existing main pipe and curing, and cutting the main lining material at the joint between the manhole and the existing main pipe and pulling the spacer A step of sealing the inner wall surface of the existing main pipe and the outer peripheral surface of the main lining material by inserting packing into the trace, and a tubular packing stopper in the packing direction from the cutting side of the main lining material And a step of fixing the packing stopper in a state where the packing is pressed.

  The cutting surface is subjected to neutralization prevention treatment before applying a primer.

  The packing is characterized by using a water swelling packing or a natural rubber swelling which swells when contacted with water.

  A fourth pipeline repairing method according to the present invention is a pipeline repairing method for repairing an intermediate portion of an existing main pipe, and a space is secured between an end portion of the existing main pipe and a resin flange of a flexible structural joint. Mounting the cushioning material and installing the flexible structural joint at the end of the existing main pipe, reversing and inserting the main lining material into the existing main pipe, and applying internal pressure to the main lining material Pressing the outer peripheral wall of the main lining material against the inner wall of the existing main pipe and the pipe inner wall of the flexible structure joint; and the outer wall of the main lining material against the inner wall of the existing main pipe and the flexible structure And a step of simultaneously curing and integrating the uncured portion of the main pipe lining material and the flexible structural joint in a state of being pressed against the inner wall of the pipe portion of the joint.

  According to the first or second pipe line repairing method of the present invention, the cushioning material is inserted between the mounting pipe wall surface and the mounting pipe lining material, so that the flange of the mounting pipe and the main pipe lining material are integrally coupled. However, since the cushion material has a structure having a variation allowance as much as a certain thickness, it has an effect of being able to cope with ground fluctuation due to an earthquake and the like, and also has an effect of securing water tightness by an integral connection.

  According to the third pipe line repairing method of the present invention, the deteriorated part of the existing main pipe is repaired, and the water-swelling packing is installed between the existing main pipe and the main pipe lining material at the joint portion between the manhole and the existing main pipe. As a result, it is possible to secure water tightness and prevent intrusion of groundwater, and to follow changes in the main lining material. In addition, the water-swelling packing can be exchanged structurally.

  According to the fourth pipeline repairing method of the present invention, the effect of being able to cope with ground fluctuation due to an earthquake or the like by providing a space between the end of the existing main pipe and the resin flange of the flexible structural joint and mounting the cushioning material. There is.

It is a figure which shows the longitudinal direction and the circumferential direction cross section of the attachment pipe lining material by this invention. It is a figure which shows the condition which restores the pipe line of the attachment pipe | tube by this invention. It is a figure which shows the condition which restores the pipe line of the attachment pipe | tube by this invention. It is a figure which shows the condition which restore | repairs the coupling | bond part of the manhole by this invention, and the existing main pipe. It is the A section enlarged view of FIG. It is a figure which shows the condition in the main lining material hardening in the restoration | repair of the coupling | bond part of the manhole and existing main pipe | tube by this invention. It is AA sectional drawing of FIG. It is a figure which shows the condition which repairs the edge part of the existing main pipe | tube by this invention with a main pipe lining material and a flexible structure coupling.

  Hereinafter, a pipe line repairing method according to the present invention will be described with reference to the drawings.

  Example 1 relates to a pipe line repairing method for repairing a mounting pipe branched from an existing main pipe. FIG. 1 is a view showing a longitudinal direction and a circumferential direction cross section of the mounting pipe lining material 10. The mounting pipe lining material 10 is obtained by lining the inner periphery of the resin-impregnated tube 11 with a cushion material 12 as shown in the circumferential direction BB sectional view. One end of the mounting pipe lining material 10 is folded and inverted so that the inner cushioning material 12 faces the outside, and is joined to one surface of an annular collar 13.

  The cushion material 12 uses a tubular non-woven fabric that is hermetically covered with a resin film on both the inner and outer surfaces. Tubular rubber may be used in place of the nonwoven fabric. Usually, the mounting pipe lining material 10 used for many restoration works is a tubular nonwoven fabric having a diameter of 150 mmφ and a wall thickness of 3.0 to 7.0 mm. A thin resin adsorbent 13b having a thickness of about 1 mm is applied to the surface of the flange 13 provided at the tip of the mounting pipe lining material 10 in order to increase the bonding strength with the mounting pipe lining material 10. The attachment hole 13a of the scissors 13 is for attaching the scissors of the pressure bag 14.

  FIG. 2 is a diagram illustrating a situation in which the pipe line of the attachment pipe is repaired. As shown in FIG. 2, the flange 13 of the mounting pipe lining material 10 is a bag-like thing that is coupled to the flange 13 of the pressure bag 14 and is closed. The attachment pipe lining material 10 and the pressure bag 14 are connected to the in-pipe work robot 15 and are moved through the existing main pipe 1 to align the rod 13 so as to come to the attachment pipe connection portion. After pressing the flange 13 in accordance with the wall surface of the connecting pipe connecting portion of the existing main pipe 1, compressed air or high-pressure water is injected into the pressure bag 14 to project and reverse the mounting pipe lining material 10 into the mounting pipe 2. . The cushion material 12 of the mounting pipe lining material 10 is pressed against the inner wall of the mounting pipe 2. When the projecting inversion of the mounting pipe lining material 10 into the mounting pipe 2 is completed, the mounting pipe lining material 10 including the cushion material 12 is cured while being pressed against the pipe wall in the mounting pipe 2. In FIG. 2, high-pressure air is sent from the compressor 16 to the pressure bag 14 by the air hose 17. The in-pipe work robot 15 can perform operations such as pressing the rod 13 against the inlet of the mounting pipe 2 by driving the arm by the hydraulic hose 15b. Moreover, the TV camera 15a is provided and the position in a pipe line can be confirmed. The attachment pipe lining material 10, the pressure bag 14, and the in-pipe work robot 15 are moved by a tow rope 18 stretched on the left and right sides.

  FIG. 3 is a diagram illustrating a situation in which the pipe line of the attachment pipe is repaired. FIG. 3 shows a method different from the method for repairing the mounting pipe of FIG. 2. In the case of FIG. 3, it is assumed that the cushioning material 12 is not attached to the attachment pipe lining material 10 and is composed only of a lining material made of a curable resin. Therefore, the tubular cushion material 30 is attached to the eaves 13 in advance, and pulled in from the existing main pipe 1 side toward the ground. Thereafter, compressed air or high-pressure water is injected into the pressure bag 14, and the attachment pipe lining material 10 is projected and reversed into the attachment pipe 2. Thereby, the tubular cushion material 30 is pressed against the inner wall of the mounting tube 2. When the projecting inversion of the mounting pipe lining material 10 into the mounting pipe 2 is completed, the mounting pipe lining material 10 including the cushion material 12 is pressed against the pipe wall in the mounting pipe 2. This state is maintained and the mounting pipe lining material 10 is hardened. According to this, the cushion material can be attached to the attachment tube 2 without using the attachment tube lining material 10 in which the cushion material 12 is integrated as shown in FIG.

  The second embodiment relates to a method for repairing a joint portion between a damaged or aged manhole 3 and an existing main pipe 1 as shown in FIGS. 4 and 5. FIG. 5 is an enlarged view of part A of FIG. This method can also be applied to joints such as water outlets (not shown) or pipe end joints. The main lining material 20 used for the restoration of Example 2 is obtained by removing the cushion material 12 and the flange 13 from the mounting pipe lining material 10 shown in FIG. In the restoration of the existing main pipe 1, it is necessary to secure the water tightness of the joint portion of the manhole 3 and the existing main pipe 1, the water outlet (not shown) or the pipe end joint (not shown) and to provide a flexible function. is there.

  In the method of Example 2, the deterioration portion on the inner peripheral wall of the existing main pipe 1 and the surface of the invert, which is a concave groove provided at the bottom, is scraped off at the joint between the manhole 3 and the existing main pipe 1, Space for spacer insertion is secured (first stage). Next, a primer is applied to the cut surface for waterproofing, and a resin is applied thereon to cover the surface (second stage). The tubular spacer 6 is inserted into the cutting location (third stage). The main lining material 20 is reversely inserted into the existing main pipe 1 from a manhole different from the object to be repaired (fourth stage). The inside of the inverted main lining material 20 is pressurized to press the main lining material 20 against the inner wall and the spacer of the existing main pipe 1 and harden in that state (fifth stage). The main lining material 20 is cut at the joint between the manhole 3 and the existing main pipe 1, and the spacer 6 is pulled out (sixth stage). The packing 7 is inserted into the trace, and the inner wall surface of the existing main pipe 1 and the outer peripheral surface of the main pipe lining material 20 are sealed (seventh stage). A tubular packing stopper 8 is inserted in the packing direction from the cut side of the main pipe lining material 20 (eighth stage). The packing stopper 8 is fixed with the packing 7 pressed (9th stage).

  Since the manhole 3 is applied to the sewer and the internal pressure does not act on it, the watertightness of the manhole only needs to ensure the external water pressure, that is, the watertightness against the inundation from the outside. As shown in FIG. 6, at the joint portion between the manhole 3 and the existing main pipe 1, the inner peripheral wall 4 of the existing main pipe 1 and the surface layer of the invert 5, which is a concave groove provided at the bottom, are scraped by a cutting machine. , Remove the deteriorated layer on the concrete surface. Thereby, a space for inserting the spacer 6 is secured. The cutting depth is preferably 2.0 mm to 8.0 mm. As the cutting machine, an electric or pneumatic drive type sander can be used. The joint between the manhole 3 and the existing main pipe 1 and the deteriorated layer of the invert 5 may be removed over a wide range.

  After completion of removal of the deteriorated layer, it is preferable to perform a neutralization preventing process on the joint portion of the manhole 3 and the existing main pipe 1 and the invert 5. The concrete is kept alkaline, and the alkalinity protects the reinforcing bars from oxidation. However, the carbon dioxide gas that has permeated into the concrete reduces the alkalinity and neutralizes the concrete. When the concrete is neutralized, the neutralization proceeds toward the inside of the concrete, and when the concrete reaches the reinforcing bar, the reinforcing bar rusts and the structural strength of the reinforcing bar decreases. In addition, cracks occur due to volume expansion due to rusting. In order to prevent this, paint is applied to concrete to prevent neutralization.

  As shown in FIG. 6, after neutralization prevention treatment, an epoxy resin-based primer is applied to the cutting surface, and an epoxy resin is applied thereon to perform surface coating. Next, a tubular metal spacer 6 is inserted into the cutting portion. The spacer 6 can be made of stainless steel, aluminum or steel. The size is smaller than the inner diameter of the existing main pipe 1 after cutting, the thickness is 5.0 mm to 15 mm, and the length is 100 mm to 500 mm. The length a of the spacer 6 is shorter than half of the length b of the invert 5 (a <b / 2).

  When the installation of the spacer 6 at the cutting portion of the joint portion between the manhole 3 and the existing main pipe 1 is completed, as shown in FIG. 6, the main lining material is inserted into the existing main pipe 1 from the manhole 3 different from the object to be repaired. 20 is inserted in reverse, a hot water shower hose or air hose is inserted into the inverted main lining material 20, and the inside is pressurized by hot water pressure or air pressure to connect the main lining material 20 to the inner wall of the existing main pipe 1 and the spacer. The resin is cured while being pressed to 6. When the hardening of the main pipe lining material 20 is completed, the main pipe lining material 20 is cut at the joint between the manhole 3 and the existing main pipe 1 and the spacer 6 is pulled out. As shown in FIG. 5, a water-swelling packing 7 that swells when contacted with water or a natural rubber packing 7 is inserted to seal the inner wall surface of the existing main pipe 1 and the outer peripheral face of the main pipe lining material 20. To do. A plurality of water-swelling packings 7 can be used.

  Finally, a tubular resin or metal packing stopper 8 is inserted in the direction of the packing 7 from the cut side of the main pipe lining material 20. Then, with the packing 7 pressed, the cutting surface of the invert 5 is filled with a resin putty 19 that is a restoration material, and the packing stopper 8 is fixed. The packing 7 can be replaced by removing the resin putty 19. 7 is a cross-sectional view taken along the line AA in FIG. A state where the packing stopper 8 is inserted at a position where the manhole 3 is located is shown.

  Example 3 relates to a method of repairing an end portion of an existing main pipe 1 that has been damaged or aged with a main pipe lining material 20 and a flexible structural joint 21 as shown in FIG. At the intermediate portion of the existing main pipe 1, the end of the existing main pipe 1 and the resin flange 22a are joined, and after the buffer material 23 is inserted and joined between the resin flange 22b and the main pipe lining material 20, the resin flange 22b is attached. The flexible structure joint 21 provided is provided, and the existing main pipe 1 is given a flexible structure having flexibility.

  The resin flanges 22a and 22b are formed by processing a resin absorbent material impregnated with a curable resin into a tubular shape, cutting one end into a petal shape, and then processing the annular resin absorbent material into a flange. The resin absorbent material of the flange portion is impregnated with a liquid curable resin in advance and has been cured. As the resin absorbent material, a composite material of glass fiber and resin nonwoven fabric is used. Although the flange portion has been cured, the tubular portion is impregnated with the same curable resin as that impregnated in the main lining material 20 and is cured simultaneously with the main lining material 20 during construction.

  As shown in FIG. 8, the flexible structural joint 21 is set at the pipe end of the existing main pipe 1 by providing a space for the buffer material 23 between the pipe end of the existing main pipe 1 and the flange 22 b. The space of the buffer material 23 is 30 mm to 1000 mm, and is determined by the diameter of the pipe line and the length of the pipe. After the setting of the flexible structural joint 21 is completed, the main lining material 20 is reversely inserted into the existing main pipe 1 to increase the pressure inside the main lining material 20 and the inner wall of the existing main pipe 1 and the flexible structural joint 21. In this state, the main lining material 20 and the uncured portion of the flexible structural joint 21 are simultaneously cured and integrated. In addition, a connecting portion with another existing main pipe 1 is connected by providing a flexible joint 21 in the middle. At that time, the space between the resin flanges 22 a and 22 b and the end of the existing main pipe 1 is filled with the buffer material 23. The material used for the cushioning material 23 is a rubber, non-woven fabric, foamed resin or the like whose outer surface is covered with a coating material.

  In the pipe line repair method using the resin-impregnated tube, the temperature of the lining material rises due to the heat generation or heating of the resin, and heat shrinkage occurs. For this reason, a gap is formed between the lining material and the wall surface of the existing main pipe. Since the wall surface of the existing main pipe 1 is not in close contact with the lining material unless the aging layer on the surface is completely removed, a gap is usually formed between the lining material and the wall surface of the existing main pipe 1. Due to this gap, the lining material functions as a flexible integrated structure, and an effect of following ground changes such as earthquakes and ground subsidence occurs. However, since groundwater infiltrates into this small gap and water leaks from inside the pipe where the internal pressure acts, the connection between the manhole and the existing main pipe, the branch path, the connecting pipe connection, etc. are airtight, watertight A seal was requested. Furthermore, the seal portion is required to have a structure in which the lining material moves flexibly in order to avoid stress concentration.

  In the pipe line repairing method for repairing a mounting pipe branched from an existing main pipe shown in the first embodiment, a cushioning material is inserted between the mounting pipe wall surface and the mounting pipe lining material, so that the mounting pipe collar portion and the main pipe lining are provided. Even if the materials are integrally coupled, the structure has a variation in the thickness of the cushion material, so that the watertightness can be secured by the integral coupling and the earthquake resistance is also excellent.

  Further, in the pipe line repairing method for repairing the joint portion between the manhole and the existing main pipe shown in the second embodiment, the deteriorated portion of the existing main pipe is repaired, and the existing main pipe and the main pipe lining are joined at the joint portion between the manhole and the existing main pipe. By installing a water-swelling packing between the materials, water tightness can be secured to prevent intrusion of groundwater, and fluctuations in the main lining material can be tracked.

  In the pipeline restoration method for repairing the middle part of an existing main pipe that has been damaged or aged as shown in Example 3, it is possible to cope with water flooding by connecting with a flexible structure joint, and ground deformation due to earthquake etc. by installing a cushioning material Can also be supported.

  The present invention is suitable as a pipeline repair method having earthquake resistance.

DESCRIPTION OF SYMBOLS 1 Existing main pipe 2 Mounting pipe 3 Manhole 4 Inner peripheral wall 5 Invert 6 Spacer 7 Packing 8 Packing stopper 10 Mounting pipe lining material 11 Resin-impregnated tube 12 Cushion material 13
13a Mounting hole 13b Resin adsorbent 14 Pressure bag 15 In-pipe work robot 15a TV camera 15b Hydraulic hose 16 Compressor 17 Air hose 18 Tow rope 19 Resin putty 20 Main pipe lining material 21 Flexible structure joint 22a, 22b Resin flange 23 Buffer material 24 Waterproof Processing 25 Hot water shower hose 26 Hot water 27 Manhole bottom 28 Cured part 29 Uncured part 30 Tubular cushion material

Claims (7)

A pipe line repair method for repairing a mounting pipe branched from an existing main pipe,
A step of attaching a mounting tube lining material made of a multi-layered tube whose inner periphery is covered with a cushioning material to a pressure bag, processing a resin absorbent material impregnated with a curable resin into a tubular shape,
Connecting the pressure bag and the in-pipe work robot;
Moving the pressure bag and the in-pipe work robot in the existing main pipe, and pressing the flange of the mounting pipe lining material according to the pipe inner surface of the mounting pipe connection portion of the existing main pipe;
Injecting compressed air or high-pressure water into the pressure bag to project and invert the mounting pipe lining material into the mounting pipe;
Curing the mounting pipe lining material in a state where it is pressed against the inner wall of the pipe in the mounting pipe.
The pipe line repairing method according to claim 1, wherein the cushion material is made of a tubular non-woven fabric or a tubular rubber which is hermetically covered with a resin film on the inner and outer surfaces.
A pipe line repair method for repairing a mounting pipe branched from an existing main pipe,
A step of attaching a mounting tube lining material with a hook made of a resin absorbent material impregnated with a curable resin into a tubular shape to a pressure bag;
A step of attaching a tubular cushion material to the ridge of the mounting pipe lining material, and drawing it in advance from the existing main pipe through the inside of the mounting pipe to the ground,
Connecting the pressure bag and the in-pipe work robot;
Moving the pressure bag and the in-pipe work robot in the existing main pipe, and pressing the flange of the mounting pipe lining material according to the pipe inner surface of the mounting pipe connection portion of the existing main pipe;
Injecting compressed air or high-pressure water into the pressure bag to project and invert the mounting pipe lining material into the mounting pipe;
Curing the mounting pipe lining material in a state where it is pressed against the inner wall of the pipe in the mounting pipe.
A pipeline repair method for repairing a joint between a manhole and an existing main pipe,
At the joint between the manhole and the existing main pipe, the inner peripheral wall of the existing main pipe and the deteriorated layer on the surface of the invert, which is a concave groove provided at the bottom, are scraped off to secure a space for spacer insertion;
Applying an epoxy resin-based primer to the cutting surface, applying an epoxy resin on it, and covering the surface;
A step of inserting a tubular spacer into the cutting location;
The main lining material is inverted and inserted into the existing main from a manhole different from the restoration target,
Pressurizing the inside of the inverted main lining material to press the main lining material against the inner wall and spacer of the existing main pipe, and curing in that state;
Cutting the main lining material at the joint between the manhole and the existing main pipe and pulling out the spacer;
Sealing the inner wall surface of the existing main pipe and the outer peripheral surface of the main pipe lining material by inserting packing into the trace;
Inserting a tubular packing stopper in the packing direction from the cutting side of the main lining material;
Fixing the packing stopper in a state in which the packing is pressed.
The pipe line repairing method according to claim 4, wherein the cutting surface is subjected to neutralization prevention treatment before applying a primer.
The pipe repair method according to claim 4, wherein the packing is made of a water swelling packing or a natural rubber which swells when contacted with water.
A pipeline repair method for repairing the middle part of an existing main pipe,
Securing a space between the end of the existing main pipe and the resin flange of the flexible structural joint, mounting a cushioning material, and installing the flexible structural joint at the end of the existing main pipe;
Reversing and inserting main lining material into the existing main,
Applying internal pressure to the main lining material, pressing an outer peripheral wall of the main lining material against an inner wall of the existing main pipe and a pipe inner wall of the flexible structural joint;
With the outer wall of the main lining material pressed against the inner wall of the existing main pipe and the pipe inner wall of the flexible structural joint, the main lining material and the uncured portion of the flexible structural joint are simultaneously cured and integrated. A conduit repairing method, comprising the step of:

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