JPH0619156B2 - Pipe line repair method - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method of repairing a pipeline, such as a sewer pipeline, from within the pipeline.

(Prior Art) In pipelines for sewage, drainage, water transfer, electric wires, etc., generally, when the pipe that defines the pipeline deteriorates, water leaks from the joints of the pipes or cracks formed in the pipes. Since it occurs, it is necessary to repair the leaked part and prevent the leaked water.

One of the methods for repairing a pipeline that an operator cannot enter is to inject a hardening agent into the ground around the water leakage point and surround the water leakage point with the hardening agent. However, this method is expensive because a large amount of curing agent must be injected.

As another method of repairing a pipeline that an operator cannot enter, there is a method of renewing the pipeline at the leak point with a new pipeline. However, this method is expensive because a wide range of pipelines must be renewed.

As another method of repairing a pipeline that cannot be entered by an operator, there is a method of arranging a tubular repair body on the inner peripheral surface of the water leakage location. However, in this method, since the repair body largely projects inside the pipeline, a large step is formed in the pipeline. In a running water pipeline for sewage, drainage, water conveyance, etc., which has such a stepped portion, foreign matter is likely to be caught in the stepped portion. Particularly in the case of a sewage pipeline, since many fibrous substances are contained in the running water, the fibrous substances are locked on the stepped portion, and the fibrous substances are further fibrous substances or other foreign substances. Through the process of locking the fibrous material, the mass of fibrous material locked on the stepped portion grows large in a short period of time, and as a result, the flow of running water is hindered.

(Problem to be Solved) An object of the present invention is to provide a method for repairing a pipeline in which a large step is not formed in the pipeline.

(Solution Means, Actions and Effects) A method for repairing a pipeline according to the present invention is to cut an inner surface of a repaired portion of the pipeline over the entire circumferential direction to form an annular recess in the pipeline, and then to form an inner surface without steps. And arranging a tubular repair body having an inner surface in the recess so that the inner surface thereof coincides with the inner surface of the conduit.

According to the present invention, the inner surface of the repaired portion of the pipeline is cut to form a recess on the inner surface of the pipeline, and the repaired body is arranged in the recessed portion to repair the pipeline. Compared with the method of injecting a hardening agent into the surroundings and the method of renewing the pipeline at the repair location with a new pipeline, the renewal work is easier and less expensive. Further, since the recess is formed on the inner surface of the repaired portion over the entire circumferential direction, and the repair body having the stepless inner surface is arranged in the recess so that the inner surface of the repaired body coincides with the inner surface of the conduit, foreign matter is locked. Compared to the conventional repairing method in which a large step is not formed in the conduit and the repair body projects on the inner surface of the conduit, there is less risk of the conduit being blocked by foreign matter.

After moving the repair body to the position of the recess in the contracted state,
By arranging the repair body in the recess by enlarging the repair body, the work of arranging the repair body becomes easy.

As a repair body, a supporting member having a pair of overlapping portions, which is bent in a tubular shape so that one of the overlapping portions is inside the other and the cross-sectional shape is substantially circular, and the supporting member. It is possible to use a repair body including a water blocking member arranged on the outer peripheral surface of the.

(Embodiment) An embodiment of the present invention will be described with reference to FIG.
The sewage pipe line 10 shown in FIG. 1 is composed of a plurality of pipes connected in series, and also has a first manhole 12 constructed on the upstream side and a downstream side of the first manhole. The second manhole 14 is opened.

At the time of repair, first, work is performed to close a part on the upstream side of the pipeline 10 with a known water stop plug so that the sewage does not hinder the work in the pipeline 10 during the repair work.

Next, the work of cleaning the inside of the pipeline 10 is performed. For this cleaning work, as shown in FIG.
6 is arranged in the conduit 10. The cleaning machine 16 includes a winch 18 grounded on the ground, a rope 22 extending through the roller 20 arranged at the bottom of the first manhole 12 to the pipeline 10, and a water tanker 24 for cleaning water arranged on the ground. , The roller 2 arranged at the bottom of the second manhole 14.
It is connected to a hose 28 extending to the conduit 10 via 6 and is also connected by a winch 18 from the first manhole 12 side to the second manhole 14 side or from the second manhole 14 side to the first manhole 12 side. Moved to the manhole 12 side.

While the cleaner 16 is moved in the pipeline 10, cleaning water is supplied from the water truck 24 to the cleaner 16 via the hose 28. The cleaning water is ejected from the cleaning device 16 toward the inner surface of the conduit 10. As a result, the deposits such as scales attached to the inner surface of the pipeline 10 are separated from the inner surface of the pipeline 10.
The detached deposits are removed from the inside of the pipeline 10 by the cleaning water.
It is washed away to the manhole 14 side.

Next, an operation of inspecting the damaged portion of the pipeline 10 is performed. For this inspection work, as shown in FIG. 1 (B), a television camera 30 is arranged in the conduit 10. The television camera 30 is connected to a roll 22 extending from the winch 18 and a plurality of cables 34 extending from a monitoring vehicle 32 arranged on the ground for monitoring to the inside of the pipeline 10 via rollers 26, and The winch 18 moves in the pipe line 10. Television camera 30
Can be moved by mounting it on a dolly such as a sled.

While the television camera 30 is moved in the pipeline 10,
The monitoring vehicle 32 is a power vehicle 4 for supplying power, which is arranged on the ground.
Power is supplied from 0 through the cable 42,
The television camera 3 is mounted on the monitor provided in the surveillance vehicle 32.
The part to be imaged by 0 is moved out. Thereby, the operator can confirm that the portion to be repaired, that is, the damaged portion 38 exists in the conduit 10 by monitoring the image on the monitor.

When the damaged portion 38 is confirmed, the distance from the second manhole 14 to the damaged portion 38 is measured. The distance is
For example, it can be obtained by measuring the moving distance of the television camera 30 from the second manhole 14 to the damaged portion 38, and the measurement of the distance should be performed in parallel with the confirmation work of the damaged portion 38. You can

Next, an operation of cutting the damaged portion 38 of the pipeline 10 is performed. For this cutting work, as shown in FIG. 1 (C), the television camera 30 and the cutting machine 44 are connected to the pipe line 10.
Placed inside. Television camera 30 and cutting machine 44
And are connected to each other. Television camera 30
Are connected to the surveillance vehicle 32 by a cable 34.
The cutting machine 44 is connected to a roll 22 extending from the winch 18.

The cutting machine 44 is moved to the damaged portion 38 by the winch 18 together with the television camera 30. When the cutting machine 44 is arranged at a position corresponding to the damaged portion 38, the cutting machine 4
The power for operating 4 is supplied from the motor vehicle 40 via a cable 46 extending through the first manhole 22 and into the conduit 10. As a result, the inner surface of the pipeline 10 is cut,
An annular recess 48 is formed in the inner surface of the conduit 10. Recess 4
Reference numeral 8 has a predetermined length dimension in the axial direction of the conduit 10 and a predetermined depth dimension.

When the rotation source of the cutting machine 44 is a hydraulic motor or a pneumatic motor, pressure fluid such as hydraulic oil or high-pressure air is supplied from the drive source 40 to the cutting machine 44 via the hose 50.

During the cutting work, the imaged location of the television camera 30 is moved to the monitor of the surveillance vehicle 32. Therefore, the operator can place the cutting machine 44 at the damaged portion 38 and form the recess 48 having a predetermined size on the inner surface of the conduit 10 while observing the screen of the monitor.

Next, the work of removing the cutting chips in the conduit 10 is performed.
For this removing operation, the cleaning device 16 is again placed in the conduit 10 as shown in FIG. 1 (D). Cleaning machine 16
Is moved in the pipeline 10 by the winch 18, and during that time, the cleaning water is supplied from the water truck 24. Cutting waste 5
The cleaning water 2 ejected from the cleaning machine 16 flows through the pipe 10 toward the second manhole 14 side.

Next, the operation of placing the repair body 54 in the recess 48 is performed. As shown in FIG. 2, the repair body 54 is disposed on the support member 56 obtained by bending a metal plate such as stainless steel so as to have a substantially circular cross-sectional shape, and on the outer peripheral surface of the support member. And a water stop member 58 such as rubber.

The support member 56 includes a pair of overlapping portions 56a and 56b that are overlapped with each other when placed in the recess 48,
Further, one of the overlapping portions 56a is bent in a tubular shape so as to be inside of the other 56b. Overlapping part 56
A step portion 56c is formed at b.

The water blocking member 58 is provided over the entire outer peripheral surface of the support member 56 except the portion corresponding to the overlapping portion 56a. The water stop member 58 is preferably made of a material that absorbs water and expands. As such a water blocking member,
For example, water-swellable rubber sold by Asahi Denka Kogyo Co., Ltd. under the trade name of ADEKA ULTRA SEAL can be used. However, other water blocking members may be used, or a water-curable adhesive or curing agent may be used as the water blocking member.

As shown in FIG. 1 (E), the repair body 54 includes an expander 60.
Placed around. The expander 60 includes an expander that is expanded by a working fluid such as high-pressure air, and is arranged in the conduit 10 together with the television camera 30. As the expander 60, it is possible to use, for example, a water stopcock having an expansion part that is expanded in a balloon shape by a pressure fluid such as compressed air. Such expanders are, for example,
A water stopcock sold under the trade name of Packer by Toa Grout Industry Co., Ltd., which is one of the applicants of the present invention, can be used.

The television camera 30 and the expander 60 are connected to each other. The television camera 30 has a cable 34.
Is connected to the surveillance vehicle 32. The expander 60 is connected to the rope 22 extending from the winch 18, and is moved by the winch 18 together with the television camera 30 to a position corresponding to the recess 48.

When the expander 60 is arranged at a predetermined position, FIG.
As shown in FIG. 5, the pressure fluid is supplied from the power vehicle 40 to the expander 60 via the hose 50. As a result, the expander 6
Since the inflated portion of 0 is inflated like a balloon, the repair body 54 is elastically deformed and expanded, and is pushed into the recess 48.

While the expander 60 is moved to a predetermined position and the repair body 54 is expanded, the worker can monitor the working state by the image on the monitor of the monitor vehicle 32.

The pressurized fluid is then removed from the expander 60
Is reduced, the repaired portion is imaged by the television camera 30, and the finished state is inspected. After that, the television camera 30 and the expander 60 are removed from the pipeline 10, and the water shutoff plug that has blocked the pipeline 10 is removed. This completes the repair work.

When the repair body 54 is placed in the recess 48, the inflatable portion of the inflator 60 is inflated until the overlapping portions 56a, 56b overlap each other and then contracted. As a result, as shown in FIG. 3, the overlapping portion 56a is arranged inside the overlapping portion 56b, the edge of the overlapping portion 56a is locked to the step portion 56c, and the end surfaces of the water blocking member 58 are mutually opposed. To be matched. The contraction of the repair body 54 is caused by the overlapping portion 56.
The edge of “a” is locked to the step portion 56c, and the end faces of the water blocking member 58 are blocked by abutting each other.

As shown in FIG. 4, the step portion 56c has a superposition portion 56c.
It is preferable to have a shape that forms a recess opening on the side of the end face of a. This can prevent the engagement between the edge of the overlapping portion 56a and the stepped portion 56c from being disengaged.

As shown in FIG. 4, the edge of the repair body 56 on the side of the overlapping portions 56a and 56b and the step portion 56c preferably extend in a direction intersecting with the axis of the repair body 54. In this way, compared with the case where the edges on the side of the overlapping portions 56a and 56b and the stepped portion 56c extend in the direction parallel to the axis of the repair body 54, a force that reduces the diameter dimension of the repair body 54 is exerted. Even if it works, it is possible to prevent the end edges of the overlapping portions 56a and 56b from being bent inward.

The thickness dimension and the length dimension of the repair body 54 are substantially the same as the depth dimension and the width dimension of the recess 48, respectively. The distance from the overlapping portion 56a to the overlapping portion 56b of the repair body 54 is substantially the same as the dimension along the inner peripheral surface of the conduit 10. Therefore, as shown in FIG. 5, the inner surface of the repair body 54 is aligned with the inner surface of the conduit 10 when the repair body 54 is arranged in the recess 48. For this reason, the repair body 54 does not project into the conduit 10, and a step portion due to the repair body is not formed in the conduit 10.

After the repair, when the water blocking member 58 of the repair body 54 absorbs sewage or groundwater, the water blocking member 58 expands. This allows
The force for reducing the repair body 54 acts on the repair body, but the contraction of the repair body 54 is caused by the step portion 56c at the edge of the overlapping portion 56a.
The water blocking member 54 is strongly pressed against the bottom surface of the recess 48 because the water blocking member 54 is blocked by being locked in the recess 48. As a result, the water stopping property is maintained more effectively.

In order to prevent the relative movement between the support member 56 and the water blocking member 58, the support member 56 and the water blocking member 58 are adhered by an adhesive material, or as shown in FIG. It is preferable to form locking edges 56d for locking the water blocking member 58 at both ends in the width direction.

7 and 8 show an embodiment of the cutting machine 44.
The cutting machine 44 includes a cylindrical main body 70 extending in the axial direction of the conduit 10. A plurality of jacks 72 are attached to the main body 70 so as to expand and contract in the radial direction of the main body, and a pad member 74 is attached to the end of each jack 72 on the side opposite to the main body 70.

The body 70 also has a rod 76 with an axis 78 of the body 70.
Is supported so as to be rotatable around and movable in the direction of the axis 78. A first drive mechanism 80 is attached to one end of the rod 76. The first drive mechanism 80 is
An output shaft 82 extending parallel to the axis 78 is provided. Output shaft 8
The cutter 84 is attached to the second unit 2, and the cutter 84 is rotated around the axis 86 of the output shaft 82 of the first drive mechanism 80.

A second drive mechanism 88 is further supported on the main body 70 by a plurality of arms 90. Second drive mechanism 88
Is arranged on the side opposite to the cutter 84 with respect to the body 70, and the rod 76 is also connected on the side opposite to the first drive mechanism 80.

The second drive mechanism 88 rotates the rod 76 about the axis 78 and moves it in the direction of the axis 78. As such a drive mechanism, for example, a so-called double-acting hydraulic actuating mechanism having a motor function and a jack function can be used.

During cutting, the cutting machine 44 is moved to a predetermined position in the conduit 10 with the jack 72 contracted.

Next, when the cutting machine 44 is placed at a predetermined position, the jack 72 is extended and the pad 74 is pressed against the inner surface of the conduit 10. This keeps the cutting machine 44 immovable with respect to the conduit 10.

Then, the first drive mechanism 80 and the second drive mechanism 88 are operated. This causes the cutter 84 to rotate about the axis 86 by the first drive mechanism 80, and the rod 76 to rotate about the axis 78 and move in the direction of the axis 78 by the second drive mechanism 88. As a result, the cutter 84 is rotated about the axis 86, is rotated about the axis 78, and is moved in the direction of the axis 78, so that the cutter 84 has a predetermined width and depth. A recess 48 is formed.

[Brief description of drawings]

1 (A) to 1 (F) are views for explaining steps of the repair method of the present invention, FIG. 2 is a perspective view showing an embodiment of a repair body, and FIG. 3 is FIG. FIG. 4 is a perspective view showing an enlarged state of the repair body of FIG. 4, FIG. 4 is an enlarged view of the abutting portion of the repair body of FIG. 2, and FIG. 5 is the push of the repair body of FIG. 2 into the recess formed in the conduit. FIG. 6 is an enlarged view showing a fitted state, FIG. 6 is a sectional view showing another embodiment of the repair body, FIG. 7 is a sectional view showing one embodiment of a cutting machine, and FIG. 8 is a right side view of FIG. Is. 10: Pipe line, 44: Cutting machine, 48: Recess, 54: Repair body, 56: Support member, 58: Water stop member, 56a, 56b: Overlap part, 56c: Step part.

Claims (3)

[Claims] Claim: What is claimed is: 1. An inner surface of a repaired portion of a pipeline is cut over the entire circumferential direction to form an annular recess in the pipeline, and then a tubular repair body having an inner surface without steps is used. A method for repairing a conduit, which comprises disposing the recess in the recess so as to match the inner surface of the conduit. 2. The repair body is arranged in the recess by moving the repair body in a contracted state to the position of the recess and then enlarging the repair body. The method for repairing the pipeline described in. 3. The repair body is a support member having a pair of overlapping portions, the supporting member bent in a tubular shape so that one of the overlapping portions is inside the other and the cross-sectional shape is substantially circular. The method for repairing a pipeline according to claim (2), comprising a member and a water blocking member arranged on an outer peripheral surface of the support member.