JP2516549B2 - Inner surface repair method for resin coated pipe at branch pipe connection - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to small-diameter sewer pipes and other underground pipes that are difficult to inspect and repair from the outside.
The present invention relates to a repair technique for damage, cracks, joint failure, etc. at a connecting portion between a main pipe and a branch pipe (branch pipe). More specifically, the present invention relates to a technique for repairing the inner surface of the pipe at the connecting portion between the main pipe and the branch pipe (branch pipe) by performing resin coating repair from the inner surface of the pipe.

[0002]

2. Description of the Related Art As a technique for repairing a resin coating from the inner surface of a pipe of this type, Japanese Patent Laid-Open No. 3-178425 "Hard tube lining method for inner surface of pipe" is known.

[0003]

The above-mentioned known technique is to insert a resin tube into a pipeline, expand it under pressure, press it against the inner surface of the pipeline, heat cure it, and repair it. Although it is suitable, there is a problem that it is not economically suitable for limited local repair.

As an invention for solving the above-mentioned problems, the applicant of the present invention filed Japanese Patent Application No. 4-3 filed on Dec. 29, 1992.
No. 61051 “Resin-coated pipe inner surface repair method and resin-coated pipe inner surface repair device” is applied. In the invention of the prior application, the repair material pressed against the inner wall of the pipeline at the repair location is pressurized to the tubular rubber tube to expand the rubber tube, thereby pressing the repair material against the inner surface of the pipeline. are doing. An object of the invention of the present application is to apply the invention of the above-mentioned prior application to a repaired portion on an inner surface of a conduit of a connecting portion between a main pipe and a branch pipe (branch pipe). That is, an object of the present invention is to reliably and strongly press the repair material against the inner wall of the conduit of the connection portion with the branch pipe (branch pipe) and completely coat the inner wall of the conduit of the connection portion with the repair material.

[0005]

Means for Solving the Problems The present gun onset Ming is cured by heating the repair material in a state of being pressed against the pipe inner wall of the desired repair position, resin-coated performing resin coating of breach in the conduit When repairing the inner surface of a pipe, the repair material is attached to the outer peripheral surface of the rubber tube of the conduit inner wall repair tool, and a repair material with a partially deformed area is used. Using the repair tool for the inner wall of the pipe, insert a TV camera into the branch pipe, check the surface condition of the repair material facing the branch pipe connection part in the pipe line, and move inside the pipe line to the branch pipe connection part. Insert the repairing material attached to the outer peripheral surface of the rubber pipe body of the conduit inner wall repair tool into the branch pipe by rotating the repaired inner wall repair tool by remote control. After confirming it with a TV camera that did, expand the rubber tube by supplying pressurized air. Due to the expansion of the rubber tube in contact with the deformed area of the repair material into the branch conduit, the deformed area of the repair material is projected toward the branch conduit side and in a bent state, the inner wall of the conduit at the connection between the main pipe and the branch pipe A resin coating type pipe inner surface repairing method for a branch pipe connecting portion, which is characterized by press-contacting with and resin coating.
It

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 5 to 8 show a conduit inner wall repair tool A used in the practice of the present invention, in which disks 4, 4 are provided at both ends of a cylindrical body 1 having a double cylinder structure of an inner cylinder 2 and an outer cylinder 3. A through chamber D is formed by welding or the like, and the rubber tube body 5 is integrated with the cylinder body 1 in a hermetically sealed state by a fixing means such as tightening and mounting the rubber tube body 5 on the discs 4 and 4 of the cylinder body 1. Rubber tube 5
To form a pressure chamber E between the outer cylinder 3 and the outer cylinder 3, the heater 7 is wound around the outer cylinder 3 to heat the pressure chamber E freely, and the annular chamber C has a temperature sensor. Decorate 8.
Although the temperature sensor 8 is installed in the annular chamber C in the above embodiment, it is fixed to the inner cylinder 2 or installed in the pressurizing chamber E to measure the temperature of the inner cylinder 2 or the pressurizing chamber E. By that,
Of course, it is possible to know the temperature of the repair material M.
Further, the temperature sensor 8 may be fixed to the inner surface side of the rubber tube body 5 that is in contact with the repair material M, and the temperature of the repair material M may be directly measured via the rubber tube body 5.

The circular plates 4, 4 of the cylindrical body 1 are rotatably supported by a support shaft 22 via a bearing 21 so that the cylinder body 1, the rubber tube body 5 and the repair material M are rotatable about the support shaft 22, The support shaft 22 is fixed to the leg 24 supported by the traveling wheels 23, and the gear 26 and the support shaft 2 fixed to the output shaft of the motor 25 installed in the annular chamber C are provided.
The gear 27 fixed to 2 is meshed, and when the motor 25 is started, the cylindrical body 1, the rubber tube body 5 and the repair material M are moved to the running wheel 2.
It is possible to freely change the relative angle with respect to the leg 24 supported by 3. 28 is a limit switch.

The tow metal fitting 9 is fixed to the disk 4, and the tow metal fitting 9 is attached.
The wire 10 connected to one end is freely movable in the conduit by pulling with a winch or the like. Further, the disk 4 is provided with a pressurized air supply port 11, and by supplying pressurized air from an air hose 12 connected to the pressurized air supply port 11, the rubber tube body 5 is inflated and the pressure chamber is expanded. E is enlarged so that the rubber pipe body 5 can be pressed against the inner surface of the pipe line 13.

The temperature sensor 8 of the repair tool A for the inner wall of the pipe is connected to the external control unit B on the ground by the 5-core cord 14, and the three wires are used for measuring the temperature sensor. To the control device B using the three-wire cord method (the measurement error due to the resistance of the cord between the control device B and the measurement position is prevented by loading one wire not connected to the temperature sensor to the two wires connected to both ends of the temperature sensor). The remaining two wires are connected and used for supplying power to the heating heater 7.
In the embodiment, the power supply to the heater is AC100V.
Alternatively, although AC 220 V wiring is used, if a low voltage wiring is required, another power distribution method such as DC 24 V and DC 12 V can be applied.

Next, in the practice of the present invention, the repair material used for repairing the inner wall of the pipeline is made by uniformly impregnating a glass fiber or carbon fiber as a core material with a binder of an unsaturated polyester resin, an epoxy resin or a lipoxy resin. It is a matte synthetic resin product. The strength and thickness of the repair material M are adjusted by the amounts of the core material and the resin to be impregnated.

FIG. 4 shows a repair material M for a branch connecting portion used in the practice of the present invention, in which a deformed area 20 is present in the central portion. In the modified area 20, in the embodiment of FIG. 4 (a), a plurality of cutting lines 21 are formed in the central portion, and the central portion of the repair material M for branch connection portion can be bent to the front surface side or the rear surface side. And In the embodiment of FIG. 4B, the deformed area 20 is configured by forming the central through hole 22 in the central portion and forming the thin or soft deformed portion 23 around the central through hole 22. . In the embodiment of FIG. 4C, the central through hole 22 is formed in the central portion, and a plurality of thin or soft fracture line portions 24 radially formed around the central through hole 22 are formed. By doing this, the deformation area 2
Configure 0.

In repairing the branch pipe connecting portion of the inner wall of the pipe according to the present invention, the mat-like repair material M for branch connecting portion is wound around the outer periphery of the rubber pipe body 5. When winding the repair material M, grease (oils and fats), an adhesion prevention sheet, etc. for preventing the adhesion of the branch connection repair material M on the surface of the rubber tube 5 are attached to the rubber tube 5 and the branch connection. It is interposed between the repair material M. Referring to FIG. 9, after the repair material M for the branch connection part is wound around the outer periphery of the rubber tube body 5, the repair tool A for the inner wall of the conduit is drawn into the conduit 13, and the wire 10 is pulled by a winch 19 or the like. Then, the pipe 13 is moved to the defective portion. At this time, based on the video signal from the TV camera 16 which monitors the inner wall of the pipeline, the monitor TV 15 in the work monitoring vehicle 14 on the ground detects the repaired portion of the inner wall of the pipeline to detect the winch 17 of the inner working vehicle 18 on the ground. By instructing the pulling by, the pipeline inner wall repair tool A is pulled to a predetermined pipeline internal wall defective location (repair location), similar to the prior invention.

Since the pipe inner wall repair according to the present invention is intended for the branch pipe connecting portion, the pipe inner wall repair tool A is moved to the branch pipe connecting portion at the repaired portion by the above method. Monitor TV 2 on the branch pipe 25 at the branch pipe connection at the repair location
6 is inserted (see a in FIG. 1). While visually observing the surface of the repair material M facing the end of the branch pipe 25 on the monitor television 26, the motor 25 is energized to energize the motor 25 and the cylindrical body 1 of the repair tool A for the inner wall of the pipeline.
Is rotated to bring the deformed area 20 of the repair material M into a position facing the branch pipe 25 (see a in FIG. 3).

After confirming on the monitor television 26 that the deformed area 20 of the repair material M is opposed to the branch pipe 25 at the branch pipe connecting portion at the damaged portion in the pipe, the pressurizing chamber of the repair tool A for the inner wall of the pipe Feed pressurized air into E. By continuously feeding the pressurized air into the pressure chamber E, the rubber tube body 5 is inflated until it comes into pressure contact with the inner surface of the pipe line 13, and the pressurized air is further fed into the pressure chamber E, thereby branching the pipe. 25 is a branch pipe 2 which is a rubber pipe body 5 opposite to
5 project into. By the protrusion of the rubber tube 5 into the branch pipe 25, the deformed portion 20 of the repair material M is extruded into the branch pipe 25 and deformed, and the center portion of the deformed portion 20 is opened (or the central through hole 22 is enlarged). Then, the deforming portion 20 is bent such that the peripheral portion of the deforming portion 20 faces the branch pipe 25 (see FIG. 1b and FIG. 3b).

Further , by feeding the pressurized air into the pressurizing chamber E, the amount of protrusion of the rubber tube body 5 into the branch pipe 25 is increased, so that the deforming portion 20 of the repair material M on the branch pipe 25 side. The bending increases, and finally, the deformed portion 20 of the repair material M is pressed between the rubber tube body 5 and the inner surface of the branch passage 26 and comes into close contact with the inner surface of the branch tube 25 (see FIG. 3). c)). The repair material M cures if kept in this state for a certain time, but if the ambient temperature is low at this time, the curing time becomes long and becomes unstable. Along with the deformation of the repair material due to the expansion of the body 5, the repair material M is heated by energizing the heating heater 7 to stabilize the curing and shorten the curing time.

When the repair material M is deformed and hardened, as shown in FIG.
In the repair material M of a and b of FIG.
1. The break line portion 24 cuts the core material into a plurality of pieces at the deformed portion 20 of the repair material M to separate the tip portion of the repair material M into a plurality of pieces. By moving to the material separating portion, the connecting pipe facing portion of the cured repair material M becomes a tubular shape and is in close contact with the branch pipe 25. Therefore, the cured repair material M has a T-shaped elbow shape (or a branched shape with an appropriate crossing angle) and is in close contact with the inner wall of the conduit 13 and the inner wall of the branch pipe 25.

The temperature of the annular chamber C, the rubber tube body 5, the repair material M and the like is measured by the temperature sensor 8 and the heating by the heater 7 for heating is remotely operated via the control device B to bring the repair material M to a predetermined temperature. Keep in range. When the repair material M is hardened after a lapse of a predetermined time, the repair material M adheres to the inner wall of the conduit 13 and the branch pipe 25, and the conduit inner wall repair work for the branch pipe connection portion according to the present invention is completed. After the completion of the repair work at the predetermined repair location, the heating heater 7 is de-energized, the pressurized air in the pressurizing chamber E is released, and the rubber tube 5 is retracted to make the surface of the rubber tube 5 a conduit. It is detached from the inner surface of 13 so that the conduit inner wall repair tool A can be freely moved.
Pull the wire with a winch or the like to move the pipeline inner wall repair tool A to the next defective location on the pipeline inner wall and continue the pipeline inner wall repair work, or pull the pipeline inner wall repair tool A to the ground for repair. Complete the work.

In repairing the inner wall of the pipeline, the temperature near the repair material is maintained in the optimum temperature range (for example, 20 ° C. to 70 ° C.) to cure the resin, regardless of the temperature around the pipeline at the repair location. The repair material can be surely hardened to perform a complete resin coating repair, and the maximum temperature is regulated to prevent the rubber deterioration of the rubber tube body 5. Due to the presence of the penetration chamber D, repair work can be performed in a water-passing state, and cooling air and cooling water can be passed through the penetration chamber D when repairing the inner wall of the pipeline at a location with a high underground temperature around the pipeline. Thus, by lowering the temperatures of the annular chamber C and the pressurizing chamber E (for example, 20 ° C. or less), the effect of the repair material during the movement of the repair tool for the inner wall of the conduit (during the work of setting the repair material to the repaired part of the inner wall of the conduit) Can be blocked. In the embodiment, the repair tool for the inner wall of the conduit is moved by the pulling wire method, but it may be a self-propelled (robot) type of remote control.

Although the connection between the repair material M according to the present invention and the repair material N according to the prior invention can be arbitrarily set, FIG. 2 shows a case where a part thereof is overlapped, and FIG. 2A is a repair material according to the present invention. M
The repair work of the repair material N according to the prior invention is preceded by the repair work of No. 1, and the repair work of the repair material M according to the present invention is preceded by the repair work of the repair material N according to the prior invention. It is a thing. In the above embodiment, the branch pipe 25
Although the direction is perpendicular to the pipe line 13, the present invention can of course be applied to the connection portion with the branch pipe 25 connected to the pipe line 13 at an appropriate crossing angle. Further, the present invention can be applied to the branch pipe 25 connected to the pipe line 13 in the horizontal direction and the inclination angle in addition to the vertical direction.

[0020]

[Effect] According to the invention of the present application, the deformation area of the repair material is bent toward the branch pipe side at the connection portion with the branch pipe and is pressed against the inner wall of the pipe line of the branch pipe, so that the main area of the repair material is the deformed area of the repair material. There is an effect that the inner wall of the pipe line at the connecting portion between the pipe and the branch pipe is coated with a resin to completely repair the inner wall of the pipe line by coating the resin at the connecting portion of the inner wall of the pipe line.

[Brief description of drawings]

FIG. 1 is a longitudinal cross-sectional view in the longitudinal direction of a pipeline showing a deformation of a rubber pipe body and a repair material at the time of repairing an inner wall of a pipeline according to the present invention. Show.

FIG. 2 is a schematic view showing the use position of the repair material of the present invention.

FIG. 3 is a vertical cross-sectional view of the pipeline in the transverse direction of the pipeline showing the deformation of the rubber tubular body and the repair material at the time of repairing the inner wall of the pipeline according to the present invention. Figure c shows the completion of repair work.

FIG. 4 is a plan view of a repair material.

FIG. 5 is a vertical cross-sectional view of a conduit inner wall repairing tool of the present invention, where the left half shows a state where the rubber tube is not pressed and the right half shows a state where the rubber tube is pressed.

FIG. 6 is a partial vertical cross-sectional view showing the air supply structure.

[Figure 7] Similarly, front view

FIG. 8 is a side view of the same.

FIG. 9 is an explanatory view of the repair work for the inner wall of the pipeline according to the present invention.

[Explanation of symbols]

 A Pipe inner wall repair tool E Pressurizing chamber M Repair material 1 Cylindrical body 5 Rubber pipe body 13 Pipe line 20 Deformation area 25 Branch pipe

Claims (4)

(57) [Claims] 1. A rubber tube body, which can be expanded by the supply of pressurized air and whose peripheral surface can be crimped to the inner surface of the pipe when the inner surface of the resin-coated pipe is repaired by coating the resin on the damaged portion in the pipe. Use a repair tool for the inner wall of the conduit that is freely movable in the pipeline, install the repair material on the outer peripheral surface of the rubber tube of the repair tool for the inner wall of the conduit, and then guide the TV camera that moves in the conduit. Move the repair tool on the inner wall of the conduit to the damaged part in the conduit by pulling the wire, and supply pressurized air to the rubber conduit to expand the rubber conduit,
Press the outer peripheral surface of the rubber tube against the inner wall of the pipe at the damaged point,
After the repair material is pressed against the inner wall of the pipeline at the desired repair location, the repair material is heated for a specified time to cure the repair material while being pressed against the inner wall of the pipeline at the desired repair location. In the resin-covered pipe inner surface repairing method for completing the repair operation of the pipe inner surface, a repair material having a deformed area formed in part is used for attaching the repair material to the outer peripheral surface of the rubber tube body of the conduit inner wall repair tool. At the same time, while using a repair tool for the inner wall of the conduit that can be rotated by remote control, insert a TV camera into the branch pipe and check the surface condition of the repair material facing the branch pipe connection in the conduit. , The pipe inner wall repair tool that has moved inside the pipeline to the branch pipe connection part is remotely rotated, and the repair material attached to the outer peripheral surface of the rubber pipe body of the pipe inner wall repair device is connected to the branch pipe connection part. TV camera with the branch pipe inserted at the opposite position After confirming in step 2, the pressurized air is supplied to expand the rubber tube, and the rubber tube that contacts the deformation area of the repair material expands into the branch pipeline, causing the deformation area of the repair material to project to the branch pipeline side. A method for repairing a resin-coated pipe inner surface of a branch pipe connecting portion, which comprises press-contacting a pipe inner wall of a connecting portion between the main pipe and the branch pipe in a bent state to form a resin coating. 2. The method of repairing the inner surface of a pipe of a branch pipe connecting portion according to claim 1, wherein a repair material having a deformed area formed by a plurality of cutting lines is used. 3. The branch pipe connecting portion according to claim 1, wherein the deformed area is a repair material formed of a central through hole and a thin or soft deformed portion around the central through hole. Method for repairing resin coated pipe inner surface. 4. A repair material having a deformed area formed of a central through hole and a plurality of thin or soft fracture line portions radially formed around the central through hole. resin-coated type inner surface repairing how the branch pipe connection of claim 1.