JP2812632B2 - Pipeline repair method and pipe repair tool used for its implementation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe repair method for repairing a damaged portion of a pipe buried in the soil from inside the pipe, and a pipe repair tool used for carrying out the method.

[0002]

2. Description of the Related Art In a pipe such as a main pipe buried underground, or a pipe connecting a main pipe to a catchment basin, there is a possibility that water leakage or the like may occur due to breakage of the pipe. In particular, in the case of a relatively small-diameter installation pipe, since the pipe is attached to the main pipe in a bent state by the use of a bent pipe, not only the pipe itself is damaged, but also as shown in FIG. There is a possibility that the connection pipes 81 may be misaligned (misaligned).

In order to repair such damage to the pipeline,
A repair method using a sleeve-like repair material having a thermoplastic resin has been developed. In this repair method, after the repair material is fitted to the outer peripheral surface of an inflatable cylindrical sleeve having elasticity, the sleeve is inserted into a pipeline and guided to a predetermined damaged position, and then the sleeve is inserted. The repair material is brought into close contact with the damaged portion in the pipeline. Then, by curing the thermosetting resin in the repair material, the sleeve-like repair material is adhered or adhered to the damaged portion in the pipeline, and the damaged portion is repaired.

In such a method for repairing a pipeline, it is not easy to guide a flexible elastic sleeve to a predetermined damaged position in the pipeline. For this purpose, for example, Japanese Patent Application Laid-Open No. 58-17278 discloses a method in which an elastic sleeve is connected to an insertion head and guided to a damaged position of a pipeline.

[0005]

In such a method,
The insertion head attached to the elastic sleeve cannot pass through an installation pipe line or the like that is bent by using a curved pipe, and the elastic sleeve may be guided to a damaged position of the pipe line. It may not be possible. Further, even when the connection pipes 81 connected to each other are misaligned with each other, the opening formed by overlapping the end faces of the connection pipes 81 is completely formed in the end face opening of each connection pipe 81. Since the area is smaller than the area, there is a possibility that the insertion head cannot pass through the portion. Further, there is a possibility that the gas passage cannot pass through a pipe having a depressed cross section.

Japanese Patent Application Laid-Open No. 2-275194 discloses a method in which a cutting machine is introduced into a pipeline to repair a misaligned pipeline portion with the cutting machine. But,
This method requires the use of expensive cutting machines,
Moreover, there is a disadvantage that the repair time by the cutting machine is very long. Further, if the pipe is bent, the cutting machine may not be able to pass through the pipe.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a pipe line repairing method capable of reliably repairing a broken pipe, damage due to misalignment and depression, and the like, and its use. Pipe repair equipment.

[0008]

SUMMARY OF THE INVENTION A method of repairing a pipeline according to the present invention provides a method for repairing a pipeline partially due to a displacement or depression between adjacent pipelines.
A pipe repair method for repairing a pipe or the like having a reduced diameter, wherein a tube expanded from a contracted state until the outer diameter becomes substantially equal to the inner diameter of the pipe to be repaired is lengthened in a contracted state.
A step of flatly folding the tube in the width direction along the hand direction, a step of winding a repair material whose diameter can be expanded on the outside of the folded tube, and a pipe to be repaired on the tube around which the repair material is wound insert within the steps to position the repaired portion of the tube path, thereby inflating the tube to diameter of the repair material, if the outer peripheral surface of the repair material Ru is adhered to the inner peripheral surface of the conduit
Eliminate the misalignment between adjacent pipelines or partially reduce the diameter
Repair the reduced diameter of the pipe section to its original dimensions
And repairing the object, thereby achieving the above object.

In addition, the pipe repair tool of the present invention has a partially reduced diameter due to a displacement or depression between adjacent pipes.
A pipe repair tool that is inserted into a pipe to be repaired in order to repair a pipe or the like that has been repaired, and is expanded to an outer diameter substantially equal to the inner diameter of the pipe to be repaired at the time of repair, and outside the pipe. and expanded the repair material wrapped by have a tube to come into close contact with the inner surface of the conduit, the tube, the width along the longitudinal direction
It has the flexibility to fold in
Even if it is stretched, it does not expand beyond the specified outer diameter, and
The above-mentioned object is achieved.

[0010]

In the pipe repair method of the present invention, a pipe repair tool having a tube and a repair material folds the contracted tube flat in the width direction along the longitudinal direction and winds the repair material around the outside. Since the pipe is inserted into the pipe to be repaired in the state, the cross-sectional area of the pipe repair tool can be made very small. Therefore, it is possible to reliably pass through the bent pipe. Further, even if the adjacent pipes are misaligned, they can be reliably inserted into the misaligned portions. Furthermore, in the sinking
Even pipes with smaller diameters are partly piped.
The road repair tool can be reliably inserted.

[0011] When the tube is guided to the repair location, the tube is expanded, and the connection pipe, which has been misaligned, moves so that the core is aligned, and has an outer diameter substantially similar to the inner peripheral surface of the conduit. The diameter has been expanded to eliminate the misalignment between adjacent pipelines.
You. Also, the diameter is partially reduced due to the depression.
The diameter of the pipe section is restored to its original size. Moreover, the pipeline
The tube of the repair tool expands beyond the specified outer diameter even when expanded.
Since it has the property of not stretching and not extending in the longitudinal direction ,
The connecting pipe is not broken by expansion pressure or elongation stress .
As a result, the repair material wound around the tube is expanded in diameter and closely attached to the inner peripheral surface of the pipeline, and the damaged portion of the pipeline is repaired.

[0012]

Embodiments of the present invention will be described below. The pipe repair method of the present invention, for example, as shown in FIG.
It is used for repairing the installation pipeline 30 buried from 0 to the main pipe 20. The attachment pipe 30 connects, for example, a straight pipe 31 connected to the box 10, a curved pipe 32 connected to a branch pipe 21 branched from the main pipe 20, and further connects the straight pipe 31 and the curved pipe 32. And a straight pipe 34. The mounting pipe 30 is in a state where the bent pipe 32 and the branch pipe 21 branched from the main pipe 20 are misaligned. The pipe repair method of the present invention repairs this misaligned portion using the pipe repair tool 40 of the present invention.

As shown in FIG. 2, the pipe repair tool 40 has a pressure-resistant tube 41 which can be expanded and contracted. When the tube 41 is expanded, both front and rear end faces are closed so as to be cylindrical. When the tube 41 is inflated, each end of the tube 41 has a tapered shape whose diameter is gradually reduced toward the end face. An end of an air hose 50 that supplies compressed air to the inside of the tube 41 is connected to one end surface of the tube 41 by a nipple 51. The other end of the air hose 50 is
It is connected to an air source 54 via an air gauge 52 and an air valve 53. One end of a high-pressure hose 61 as a buffer member is connected to an end surface of the tube 41 to which the air hose 50 is connected by a nipple 62. At the other end of the high pressure hose,
One end of the push rod 60 is connected. The push rod 60 is made of a special steel or the like that can bend along the bend of the mounting pipe 30, and is connected to the other end of the other push rod 60 by a connection fitting 63 at the other end.

The tube 41 is expanded so that
The outer diameter is substantially the same as the inner diameter of the mounting pipe 30. For example, if the inner diameter of the mounting pipe 30 is 150 mm,
mm outside diameter, does not expand further and does not stretch in the axial direction. The axial length of the tube 41 and the outer diameter of each end face are appropriately set. For example, when the outer diameter at the time of expansion is 150 mm, the outer diameter of each end face is 90 mm and the length is 820 mm. The tube 41 has such a strength that it does not burst even when the internal pressure becomes about 10 kgf / cm ² when expanded.

Such a tube 41 is further flattened when the air inside is removed and contracted, and in such a state, it can be folded in half in the width direction along the longitudinal direction. It has the flexibility to do it. And
In such a folded state, the inside of the mounting conduit 30 is
It has rigidity that allows it to pass without bending in the axial direction.

As a material of the tube 41 satisfying these properties, a nylon tarpaulin sheet obtained by reinforcing a rubber sheet such as chlorosulfonated polyethylene (trade name "Hypalon") or chloroprene (trade name "neoprene") with a nylon thread is used. It is suitable.

FIG. 3 shows the types of nylon tarpaulin sheets. FIG. 3A shows a one-ply nylon tarpaulin sheet, in which a one-ply nylon yarn 101 is covered with neoprene 100 and has a thickness of 1.0.
It has a structure of 0 mm.

FIG. 3 (b) shows a two-ply nylon tarpaulin sheet having a thickness of 1.6 mm in which two layers of cross-woven nylon yarns 103, 103 are covered with a hypalon 102.

FIG. 3 (c) shows a three-layered nylon tarpaulin sheet having the structure shown in FIGS. 3 (a) and 3 (b).
The figure shows a nylon tarpaulin sheet with the number of plies, in which a one-ply nylon thread 104 is arranged inside and a two-ply nylon thread 104, 104 is arranged outside.

The pipeline repair method of the present invention using the pipeline repair tool 40 having such a configuration is carried out as follows. First, the air hose 50 and the pushing rod 60 are detached from the tube 41 so that the air in the tube 41 is freely discharged. In such a state, the tube 4
1 is flattened over its entire length, and then the tube 41 is folded along a longitudinally extending center line as shown in FIG. 4 (a). Subsequently, a sheet-like repair material 70 is wound around the outer peripheral surface of the flatly folded tube 41, and adhesive tapes or the like are pasted at a plurality of locations in the circumferential direction and temporarily fixed. Thereby, the cross-sectional area can be made extremely small. In addition, the method of folding the tube 41 is not limited to the above example, and the tube 41 may be folded like a three-fold or a roll. Further, the adhesive tape is easily cut by the force when the tube 41 expands.

The repair material 70 is, as shown in FIG.
When the tube 41 expands, it has a sleeve-like shape that covers the entire outer peripheral surface of the tube 41, and can be in close contact with the entire inner surface of the mounting conduit 30. Repair material 7
Numeral 0 denotes a fiber sheet 71 for reinforcement in which a curable resin 72 is impregnated, and films 73 and 74 are attached to both surfaces of the fiber sheet 71 impregnated with the curable resin.

As the fiber sheet 71, for example, a glass cloth, a glass chopped strand mat, a sheet made of sheet molding powder, a continuous mat, or the like is used. The curable resin 72 is made of a thermosetting resin such as an unsaturated iso-polyester resin, an epoxy resin, or the like, and a low-heat-curing material (for example, trade name “Percure H” manufactured by NOF Corporation).
B ") at a ratio of 2 to 3% to obtain a room temperature curing type. Outer peripheral film 73
Is preferably a PVC film or the like having good adhesion to the inner peripheral surface of the mounting conduit 30, and the inner peripheral film 74 is a polypropylene (PP) sheet having excellent releasability from the curable resin 72; A polyethylene (PE) sheet or the like is desirable.

The repair material 70 includes the folded tube 40.
And each end is overlapped.

When the repair material 70 is wound around the tube 41, the air hose 50 and the pushing rod 60 are connected to the tube 41, and the tube 41 around which the repair material 70 is wound is pushed from the box 10 into the mounting conduit 30. . Then, while the pushing rods 60 are sequentially added, the tube 41 is finally pushed to a portion where the mounting pipeline 30 needs to be repaired. Tube 41
Does not bend even when sequentially passing through the inside of the mounting conduit 30 and can bend along the curved pipe portion of the mounting conduit 30, so that it smoothly moves in the mounting conduit 30. . The part of the mounting pipeline 30 that needs repair is the mounting pipeline 4
The approximate position is specified in advance by the in-pipe photographing television camera moved inside 0, and the distance is measured. As shown in FIG. 5 (a), the portion where the tube misalignment (center misalignment) has occurred has a small effective opening area, but the small folded tube 41 can be securely inserted inside the tube misalignment. Inserted.

A central portion of the tube 41 in the longitudinal direction is located within the misaligned portion, one half of the tube 41 is located within the branch tube 21 of the main tube 20, and the other end is attached to the mounting tube. It is located in the curved tube 32 of the tract 30. In such a state, the pushing of the tube 41 is stopped, and high-pressure air of, for example, about 7 kgf / cm ² is supplied from the air source 54 into the tube 41 through the air hose 50. Thereby, as shown in FIG. 4B, the tube 41 is expanded until it becomes cylindrical. With the expansion of the tube 41, the repair material 70 is pressed against the inner peripheral surface of the branch pipe 21 of the main pipe 20 and the inner peripheral surface of the curved pipe 32 of the attachment conduit 30, and the pipe is displaced from the branch pipe 21. 32 is moved until it is coaxial. That is, repair is performed.

Here, the pipe displacement between the branch pipe 21 and the bent pipe 32 is easily eliminated because, in the soil, the part where the pipe is displaced is hollowed out due to inundation or mixing of earth and sand. This is because there is no large resistance that hinders the operation.

The repair material 70 wound around the tube 41 must be expanded so that the tube 41 is expanded to almost the same state as the inner diameter of the mounting conduit 30 and is not broken even when high-pressure air is supplied. With the expansion of 41, the inner diameter of the branch pipe 21 and the inner circumference of the curved pipe 32, which are expanded in a sleeve shape and are coaxial, are brought into pressure contact with each other. In this state, the expanded state of the tube 41 is maintained until the room-temperature-curable curable resin 72 in the repair material 70 is cured.

When the curable resin 72 is cured, the tube 4
The air in 1 is discharged through an air hose 50, and the tube 41 contracts. Thereby, the tube 41 is in a flat state, and in such a state, the tube 41 is pulled out from the inside of the mounting conduit 30. At this time, the repair material 7
0 is hardened while being pressed against the inner peripheral surface of the branch pipe 21 and the inner peripheral surface of the curved pipe 32, so that the state of adhesion to those inner peripheral surfaces is maintained, and only the contracted tube 41 is used as a repair material. 70, and is removed from the mounting conduit 30. Thereby, as shown in FIG. 6 and FIG. 5 (b), the inner peripheral surface of the branch pipe 21 and the inner peripheral surface of the curved pipe 32 which are coaxial are connected by the hardened repair material 70. Lined.

The repair material 70 lined between the inner peripheral surface of the branch pipe 21 and the inner peripheral surface of the curved pipe 32 is in a straight pipe state because the branch pipe 21 and the curved pipe 32 are coaxial. Become
Water leakage, infiltration water, and sediment inflow can be reliably prevented. Further, it becomes easy to repair the mounting conduit 30 thereafter by a lining pipe inserted therein. When the number of plies of the fiber sheet 71 in the repair material 70 is increased, the strength of the repair material 70 is improved. Therefore, the cured repair material 70 is made of a fiber reinforced plastic pipe (FRP pipe).
It can also be used for repairing partially missing parts of pipelines.

It should be noted that the present invention, as described above,
The repair is not limited to the case where the straight pipe such as the branch pipe 21 branched from 0 and the bent pipe 32 are misaligned. For example, as shown in FIG. If the 30 ° bent tube 32b is misaligned, it can also be used to repair them. Further, the present invention is not limited to the repair of the pipe displacement in the mounting pipe line 30 attached to the main pipe 20, but can also repair the pipe displacement in the main pipe.

Further, as shown in FIG. 8, a depression 134 occurs in the straight pipe 34 connecting the straight pipe 31 and the curved pipe 32, and repair can be performed when the diameter of this portion is reduced. is there. That is, by expanding the tube 41, the outer diameter of the depressed portion can be restored to the original size.

[0032]

As described above, the pipe repair method of the present invention provides:
Because the repair material is wrapped around a tube that has been folded into a small flat state, so that it can be inserted through the pipeline,
In addition to being able to reliably pass through bent pipes, it is also possible to position reliably in connection sections where the effective opening area between connection pipes that are misaligned is reduced, and also in sections where the cross section is reduced due to depression. Become. Therefore, it is possible to easily and surely repair various troubles such as breakage and depression of the pipe line and pipe displacement between the connection pipes.

Further, the pipe repair device of the present invention, the Chu
The height at which the valve can be folded widthwise along its length
Because of its flexibility, the cross-sectional area becomes very small when contracted . In addition, even if this tube is inflated,
It does not expand beyond the diameter and does not extend in the longitudinal direction.
So that when the tube expands, the connecting tube
Since it is not destroyed by heat or elongation stress, it is suitably used in the pipeline repair method of the present invention.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment of a method for repairing a pipeline according to the present invention.

FIG. 2 is a partially broken side view showing an example of the pipe repair tool of the present invention used in the method.

FIG. 3 is a view showing the structure of a plurality of types of nylon tarpaulin sheets.

4A is a cross-sectional view of the pipeline repair tool in a contracted state, and FIG. 4B is a cross-sectional view of the pipeline repair tool when inflated.

FIG. 5A is a cross-sectional view showing a pipe in a pipe misalignment state before repair, and FIG. 5B is a cross-sectional view showing a pipe after repair.

FIG. 6 is a cross-sectional view showing a pipeline restoration portion after repair.

FIG. 7 is a sectional view showing another embodiment of the pipeline repair method of the present invention.

FIG. 8 is a sectional view showing still another embodiment of the pipeline repair method of the present invention.

FIG. 9 is a cross-sectional view showing a displaced connection pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Masu 20 Main pipe 30 Mounting pipe 40 Pipe repair tool 41 Tube 50 Air hose 60 Push rod 70 Repair material 71 Fiber sheet 72 Curable resin

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 592012650 Adachi Construction Industry Co., Ltd. 2-34-16 Nishisugamo, Toshima-ku, Tokyo (73) Patent holder 000002174 Sekisui Chemical Co., Ltd. 2 Nishitenma, Kita-ku, Osaka-shi, Osaka Chome 4-4 (72) Inventor Shunichi Shishido 2-30-12 Tobita Kyu, Chofu-shi, Tokyo (72) Inventor Yasumaru Ishiguro 1-2-22-15 Kotehashidai, Hanamigawa-ku, Chiba-shi, Chiba (72) Inventor Hamao Yamashiro 213-10 Sasai, Sayama-shi, Saitama 5th floor, Sayama Green Heights 402 (72) Inventor, Sakae Sano 5-34-27, Sugamo, Toshima-ku, Tokyo (72) Inventor, Kazuhiko Sanada 6-14-3, Higashisuna, Koto-ku, Tokyo -402 (72) Inventor Naoki Kitahashi 2-32-10 Kamigasa, Kusatsu-shi, Shiga Prefecture (72) Inventor Eiki Akimoto 7-7, Ushizawacho, Iruma-shi, Saitama (72) Inventor Yoshio Aida, Higashi-Omiya, Omiya-shi, Saitama -71-8 (72) inventor Sumio Shimada Tokyo Kokubunji Hiyoshicho 1-12-4 (56) Reference Patent flat 2-129495 (JP, A) (58 ) investigated the field (Int.Cl. ⁶ , DB name) F16L 55/16-55/18

Claims (2)

(57) [Claims] 1. Due to a displacement or depression between adjacent pipelines .
A pipe repair method for repairing a pipe or the like whose diameter is partially reduced, wherein the tube expanded from the contracted state until the outer diameter becomes substantially equal to the inner diameter of the pipe to be repaired is contracted. Along the longitudinal direction
Step of flattening the tube in the width direction, winding a repairable material outside the folded tube, and inserting the tube with the repaired material wound into a pipe to be repaired. a step for positioning the repaired portion of the conduit, tube inflating the tube was expanded to the repair material to adjacent Rutotomoni brought into close contact with the outer peripheral surface of the repair material to the inner peripheral surface of the conduit
Eliminate positional deviation between roads or partially reduce the diameter
Repairing by repairing the diameter of the pipe portion to the original size . 2. Due to displacement or depression between adjacent pipelines .
A pipe repair tool that is inserted into a pipe to be repaired in order to repair a pipe, etc., whose diameter has been partially reduced, and is substantially equal to the inner diameter of the pipe to be repaired at the time of repair. It is expanded to a diameter, and enlarged the repair material wound on the outer side have a tube to come into close contact with the inner surface of the tube path, the tube, folding in the width direction along the longitudinal direction
It has the flexibility to allow
It does not expand beyond the diameter and does not extend in the longitudinal direction.
Pipeline repair tool composed of