JPH06265089A - Resin covering type repair method and apparatus for inner surface of pipe - Google Patents

Abstract

PURPOSE:To enhance heating efficiency by winding repair material embedded with a surface heating element connected to a power supply cable around a rubber tube, then placing it at a repair position within resin covering pipe and expanding diameter of the rubber tube by means of compressed air and thus pressure attaching it to the repair position from inside, and then sitting the repair material through current-carrying to the surface heating element. CONSTITUTION:Repair material M embedded with a surface heating element 7 in mat form is wound around a rubber tube 5 applied with grease or the like for preventing adhesion of the repair material M. Then, a conduit inner surface repair tool A is taken into a conduit 13 and thus the repair material M is set at a repair position. Air is sent to pressurization E, so that it is let in a rubber tube 5 to expand its diameter. The repair material M is thus pressed to inner surface of the conduit 13. Then, the surface heating element 7 is connected to power, so that the repair material M is set by heating. The course of work is controlled by means of a monitor television. After repair work, the surface heating element 7 remains with in the repair maternal M, acting as reinforcement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a resin coating repair from the inner surface of a pipeline for repairing damages, cracks, joint defects, etc., that have occurred in small-diameter sewer pipes and other underground pipes that are difficult to inspect and repair from the outer surface. It is related to the technology.

[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. In addition, since the sewer pipe is buried in the place where various conditions are different, the underground temperature around the pipeline at the repair location changes and the deterioration of the rubber pipe body equipped in the pressure repair device is prevented. Since it is necessary to keep the temperature rise below a certain limit, there is a problem of maintaining the temperature of the repaired portion within a certain range. As an invention that solves the above problems, the applicant of the present application has filed on Dec. 29, 1992.
Japanese Patent Application No. 4-361051 entitled "Resin-coated pipe inner surface repair method and resin-coated pipe inner surface repair device" is filed. In the above-mentioned prior invention, a heater for heating the rubber tube body is provided as a heating structure for the repair material pressed against the inner wall of the pipeline at the repair location. An object of the present invention is to simplify the heating structure for the repair material in the above-mentioned prior invention and to increase the heating efficiency.

[0004]

SUMMARY OF THE INVENTION According to the present invention, when repairing a resin-coated pipe inner surface for coating a damaged portion in a pipe with a resin, the peripheral surface of the pipe is expanded by supplying pressurized air to the inner surface of the pipe. Use a conduit inner wall repair tool that is equipped with a rubber tube body that can be crimped and is movable in the conduit, and after installing a repair material on the outer peripheral surface of the rubber tube body of the conduit inner wall repair tool, then in the conduit After moving the repair tool on the inner wall of the conduit to the damaged part in the conduit by wire pulling with the guidance of the TV camera that moves the rubber tube, expand the rubber tube by supplying pressurized air to the rubber tube. The outer peripheral surface of the body is pressed against the inner wall of the pipeline at the damaged location, the repair material is pressed against the inner wall of the pipeline at the desired repair location, and then the repair material is heated for a predetermined time, so that the repair material is at the desired repair location. Complete the resin coated pipe inner surface repair work by curing while being pressed against the inner wall of the pipe This is the same as the invention of the prior application, but the repair material containing the surface heating element connected to the power supply cable via the connection terminal exposed at the end is provided with the outer peripheral surface of the rubber tube body of the conduit inner wall repair tool. Attach the repair material to the damaged part in the pipeline, heat the repair material by applying electricity to the surface heating element via the power supply cable with the repair material pressed against the inner wall of the pipeline at the desired repair location. After heating and curing the repair material, when moving the repair tool on the inner wall of the conduit from the repair location, disconnect the connection cable between the power supply cable and the surface heating element,
It is characterized in that the surface heating element is left in the repaired part in a state of being buried inside the repair material which has been heat-cured.

Further, according to the second invention of the present application, the repair material which is heat-cured in a state of being pressed against the inner wall of the pipe line at a desired repair portion has a heating structure in which the surface heating body is buried, and the repair material is By allowing the surface heating body to be freely connected to the power supply cable via the connection terminal exposed at the end, the repair material is a direct heating system by the surface heating body, and the recovery of the surface heating body is unnecessary.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a pipe inner wall repair tool A used in the practice of the present invention, in which disks 4, 4 are welded or the like to both ends of a cylindrical body 1 having a double cylinder structure of an inner cylinder 2 and an outer cylinder 3. An annular chamber C is fixed between the inner cylinder 2 and the outer cylinder 3 to form a through chamber D on the inner core side of the inner cylinder 2, and the rubber tubes 5 are attached to the discs 4 and 4 of the cylinder 1. The rubber tube body 5 is integrated with the cylindrical body 1 in a sealed state by a fixing means such as a band 6 to secure the pressure chamber E between the rubber tube body 5 and the outer cylinder 3 of the cylindrical body 1.
Then, the tow metal fitting 9 is fixed to the disc 4 to form the conduit wall inner wall repair tool A.

In the prior invention, the heating structure is such that the pressurizing chamber E can be freely heated by the heating heater wound around the outer peripheral surface of the outer cylinder 3. However, the surface heating element 7 is incorporated in the repair material M. The heating structure for the repair material M is used. The connection terminal 20 connectable to the connection plug 29 of the surface heating body 7 of the repair material M is fixed to the outer surface of the end portion of the rubber tube body 5. In the embodiment of FIG. 3, the temperature sensor 8 is installed in the annular chamber C, but 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 doing so, it goes without saying that the temperature of the repair material M can be known. 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 repair tool A for the inner wall of the conduit makes the wire 10 connected to one end of the traction fitting 9 movable in the conduit by towing 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 connection terminal 20 of the pipe inner wall repair tool A and the temperature sensor 8 are connected to the ground external control device B by the 5-core cord 14, and the three wires for measuring the temperature sensor are connected from one end of the temperature sensor to one end of the two wires. Control device B with a three-wire cord system (a 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) And connect the remaining two wires to the heater power supply. In the embodiment, the power supply to the heater is AC100V or AC220V wiring, but if low voltage wiring is required, DC24V, DC12
Other power distribution methods such as V can be applied.

In the embodiment shown in FIGS. 4-7,
The circular plates 4, 4 of the cylindrical body 1 are rotatably supported by a supporting shaft 22 via a bearing 21 so that the cylindrical body 1, the rubber tube body 5 and the repair material M are rotatable around the supporting shaft 22. Is fixed to a leg 24 supported by a traveling wheel 23, and the motor 2 installed in the annular chamber C
5, the gear 26 fixed to the output shaft of 5 and the gear 27 fixed to the support shaft 22 are engaged with each other, and the cylinder 25, the rubber tube 5 and the repair material M are supported by the running wheel 23 by the start of the motor 25. It is possible to freely change the relative angle with respect to 24. 28
Is a limit switch.

Next, in the practice of the present invention, the repair material M used for repairing the inner wall of the pipeline is made of glass fiber or carbon fiber as a core material and uniformly impregnated with a binder of unsaturated polyester resin, epoxy resin, or lipoxy resin. It is a synthetic resin product that has been matted. The strength and thickness of the repair material M are adjusted by the amounts of the core material and the resin to be impregnated. Referring to FIG. 2, the surface heating body 7 which is a planar heater used for hot carpets, floor heating mats, etc. is coated with the repair material M of the above-mentioned material, and the surface heating body 7 is repaired. It is assumed to be buried inside. At the end of the repair material M, a plug 29 for connecting to the connection terminal 20 of the conduit inner wall repair tool A is projected, and the heater wire 7a is connected to the plug 29 by the lead wire 7c. The surface heating element 7 can be bent, folded, and folded with a woven fabric of filament-shaped heater wires 7a and wefts.

In repairing the inner wall of the conduit according to the present invention, the mat-like repair material M is wound around the outer circumference of the rubber tube body 5. When the repair material M is wound around the rubber tube body 5, the rubber is used. To prevent the repair material M from adhering to the surface of the tubular body 5, grease (fats and oils), an anti-adhesion sheet, etc. are attached to the rubber tubular body 5.
And the repair material M. After wrapping the repair material M around the outer periphery of the rubber tube body 5, the conduit inner wall repair tool A is drawn into the conduit 13, and the wire 10 is pulled by a winch 19 or the like to move in the conduit 13 to a 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, and the winch 19 of the inner working vehicle 18 on the ground detects it. By instructing tow, the movement of the repair tool A for the inner wall of the duct is guided.

After confirming on the monitor TV 15 that the repair tool A for the inner wall of the conduit is pulled at a predetermined defective part (repair site) on the inner wall of the conduit, and the repair material M faces the damaged part in the conduit, Pressurized air is sent to the pressure chamber E of the inner wall repair tool A.
By continuing the feeding of the pressurized air into the pressurizing chamber E and inflating the rubber pipe body 5 until the rubber pipe body 5 comes into pressure contact with the inner surface of the pipe line 13, the repair material M is formed between the rubber pipe body 5 and the pipe line 13. It is pressed against the inner surface and comes into close contact with the inner surface of the conduit 13. If this state is maintained for a certain period of time, the repair material M will cure, but if the ambient temperature is low at this time, the curing time will become long and unstable, so the surface heating body 7 is energized to heat the repair material M to cure it. Stabilize and shorten the curing time.

By measuring the temperature of the annular chamber C, the rubber tube body 5, the repair material M, etc. by the temperature sensor 8, the heating by the surface heating body 7 is remotely controlled via the control unit B to bring the repair material M to a predetermined temperature. Keep in range. Repair material M after a lapse of a predetermined time
By hardening, the repair material M comes into close contact with the defective portion (repair location) on the inner wall of the conduit, and the inner wall repair work according to the present invention is completed.

After completion of the repair work at the predetermined repair location,
The energization to the surface heating element 7 is stopped and the pressurizing chamber E
The pressurized air is removed to shrink the rubber tube body 5 to separate the surface of the rubber tube body 5 from the inner surface of the tube path 13, thereby allowing the tube wall inner wall repair tool A to move freely. Pull the wire with a winch or the like to move the conduit inner wall repair tool A to the next defective part of the conduit inner wall, and continue the conduit inner wall repair work, or pull the conduit inner wall repair tool A to the ground for repair. Complete the work.

By moving the repair tool A on the inner wall of the pipe, the repair material M
The connection plug 28 is detached from the connection terminal 20 of the conduit inner wall repair tool A, and the surface heating body 7 remains together with the repair material M on the conduit inner wall at the repaired portion. The relationship between the diameter of the inner wall of the pipe at the repaired portion and the length of the repair material M indicates the state of repairing the inner wall of the pipe as shown in FIG.
In each case, the surface heating element 7 is surrounded by the repair material M and is not exposed. Therefore, the inner wall of the pipeline at the repair location is completely repaired by the repair material M.
Therefore, the resin coating does not hinder the function of the conduit. Furthermore, since the surface heating element 7 is integrated with the repair material M, the strength of the repair material M is also increased.

In repairing the inner wall of the pipeline, the resin is hardened while maintaining the temperature in the vicinity of the repair material within the optimum temperature range (for example, 20 ° C. to 70 ° C.), 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. Then, by lowering the temperatures of the annular chamber C and the pressurizing chamber E (for example, 20 ° C. or less), the repair material is hardened during the movement of the repair tool for the inner wall of the conduit (during the setting work of 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.

[0017]

[Effect] The present invention directly heats the repair material by energizing the surface heating element buried in the repair material, thereby eliminating the heating loss and improving the heating efficiency, and at the same time, it is buried inside the repair material. Since the surface heating element remains in the repaired area in the state, the remaining surface heating element is integrated with the repair material to increase the strength of the repair material, and has the effect of making the resin coating repair on the inner wall of the pipeline more complete. .

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a pipeline showing a state of repairing an inner wall of the pipeline according to the present invention.

FIG. 2 is a perspective view of a repair material.

FIG. 3 is a vertical cross-sectional view of the conduit inner wall repairing tool of the first embodiment, in which 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. 4 is a vertical sectional view similar to FIG. 3, showing a conduit inner wall repairing tool of a second embodiment.

FIG. 5 is a partial vertical sectional view showing the air supply structure.

FIG. 6 is a front view of the same.

FIG. 7 is a side view of the same.

FIG. 8 is an explanatory view of a pipeline inner wall repair work 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 tubular body 7 Surface heating body 13 Pipeline

Claims (2)

[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 repair method that completes the inner pipe inner surface repair work, the repair material containing the surface heating element connected to the power supply cable through the connection terminal exposed at the end of Attached to the outer peripheral surface of the rubber pipe body, the repair material is pressed against the pipe inner wall of the desired repair location by the movement of the pipe inner wall repair tool and the expansion of the rubber pipe by the supply of pressurized air to the rubber pipe body. After the repair material is pressed against the inner wall of the pipeline at the desired repair location, the surface heating element is energized via the power supply cable to heat the repair material and heat-cure the repair material, then repair the inner wall of the pipeline. When moving the tool from the repair area, Releases the connection between the cable and the surface heater, the resin coating formulas inner surface repair method, characterized in that to leave the repaired portion in a state of being buried in the interior of the repairing material was thermally cured surface heating body. 2. A rubber tube body, which can be expanded by supplying pressurized air so that its 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. Then, move the repair tool on the inner wall of the conduit with the repair material attached to the outer peripheral surface of the rubber tube freely in the conduit, and heat-cure the repair material while pressing it against the inner wall of the conduit at the desired repair location. In a resin-coated pipe inner surface repair device that repairs the inner surface of the pipe with a resin, a surface heating element is embedded inside the repair material, and a connection is made at the end of the repair material so that the surface heating element can be connected to a power supply cable. A resin-coated pipe inner surface repairing device characterized in that the terminals are exposed from the repair material, the repair material is directly heated by the surface heating element, and the surface heating element is resin-coated with the repair material and remains at the repaired portion.