JP2002036363A - Method for repairing pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for repairing a pipeline, capable of heating a resin infiltrated into a repairing material without using hot water or steam to uniformly cure the same in its early stages by simple equipment. SOLUTION: A liner 13 as the repairing material impregnated with a resin is applied to the crack 10a of the pipeline 10 and the resin is cured by induction heating to close the crack 10a by the liner 13 to repair the pipeline.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a repaired portion of a pipeline in which a repair material impregnated with a resin is applied to a repaired portion such as a crack generated in a pipeline and the resin is cured to repair the repaired portion. .

[0002]

2. Description of the Related Art For example, in a concrete sewage pipe buried underground, the concrete forming the pipe wall may be damaged due to aging deterioration, such as cracks. It is necessary to repair the damaged part in order to prevent the leakage. Conventionally, as a method for repairing such a pipeline, a tubular liner (repair material) impregnated with a liquid thermosetting resin is pressed against the inner surface of the pipeline, and the thermosetting resin is heated in this state. There is known a method of forming a new pipeline with a liner inside the pipeline to close the damaged portion.

That is, as shown in FIG. 9, a liner 1 impregnated with a thermosetting resin is disposed inside an underground pipeline 2 having a damaged portion (repair portion) 2a, and water is supplied from a work vehicle 3 on the ground. Water is injected into the liner 1 through the pipe 4, and the water pressure inflates the liner 1 to press it against the inner surface of the underground conduit 2. Next, the water previously supplied by the work vehicle 3 is pumped up through the water collecting pipe 5 and the hot water is supplied through the water supply pipe 4. By circulating the hot water in this way, the thermosetting resin is maintained while the liner 1 is pressed. Is heated to cure. Due to the curing of the thermosetting resin, a new pipeline is formed by the liner 1 inside the underground pipeline 2, and the fluid flowing through the underground pipeline 2 flows through the pipeline by the liner 1.

There is also a repairing method in which high-temperature and high-pressure steam is supplied instead of supplying hot water to the inside of the liner 1 and the thermosetting resin is cured while the liner 1 is kept pressed by the steam.

[0005]

However, in the case where rainwater has entered the underground pipeline 2 from the damaged portion 2a, even if hot water is circulated, the portion 1a corresponding to the damaged portion 2a of the liner 1 will not work. Even if the temperature of the liner 1 is hard to rise, and even if the temperature of the other part of the liner 1 is high enough to cure the thermosetting resin, the temperature of that part 1a may still be insufficient for curing. Therefore, in the repair method in which the thermosetting resin is heated with warm water, the portion 1a of the liner 1 is used.
It is necessary to circulate hot water until the temperature of the hot water rises sufficiently, and there is a problem that the repair work takes time. Furthermore, this repair method has a problem that equipment and work for supplying a large amount of hot water into the liner 1 are large.

On the other hand, in the repair method in which the thermosetting resin is heated by steam, the repair work can be completed in a shorter time than in the case of using hot water, but the heating of the liner 1 tends to be uneven, and the recovery after heating is also difficult. There is a problem that the drain generated by water impedes the subsequent heating and must be treated.

The present invention has been made in view of the above circumstances, and heats a resin impregnated in a repair material without using hot water or steam, and allows the resin to cure quickly and evenly with simple equipment. It is an object of the present invention to provide a method for repairing a pipeline which can be performed.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, a first aspect of the present invention is a method of repairing a pipeline in which a repair material impregnated with a resin is applied to a repair portion of the pipeline to cure the resin. Wherein the resin is cured by induction heating.

According to the first aspect of the present invention, since the resin impregnated in the repair material is heated by electromagnetic induction without using hot water or steam, the curing of the resin can be progressed quickly and uniformly.

According to a second aspect of the present invention, in the method for repairing a pipeline according to the first aspect, a conductive material is mixed into the repair material, and the repair material is pressed against an inner surface of the pipeline, thereby repairing the repair material. An induction coil is disposed inside the conduit so as to face the resin, and the resin is cured by heat generated by flowing an electric current through the induction coil and causing an induced current to flow through the conductive material. And

According to the second aspect of the present invention, the induction coil may be disposed so as to face the repairing material pressed against the inner surface of the pipeline, and only the guide coil is filled or circulated through the pipeline. Since there is no need to prepare a large amount of water or steam, the repair can be performed with simple equipment.

According to a third aspect of the present invention, in the method for repairing a pipeline according to the second aspect, the induced current is generated by passing a time-varying current through the induction coil.

According to the third aspect of the present invention, since an induced current is generated by supplying a current that changes with time to the induction coil, the induction coil may be moved at a low speed or may be stationary. It is not necessary to move the induction coil at high speed to cause a change in magnetic flux.

According to a fourth aspect of the present invention, in the method for repairing a pipeline according to the third aspect, the current that changes with time is an alternating current.

According to the fourth aspect of the present invention, a change in magnetic flux around the induction coil can be efficiently generated, and an induced current can be easily generated.

The invention of claim 5 is the invention of claims 2 to 4
The method for repairing a pipeline according to any one of the above, wherein the induction coil is movable by remote control from outside the pipeline.

According to the fifth aspect of the present invention, since the induction coil is movable by remote control, even if the pipe to be repaired is underground, the worker can easily carry out the repair work on the ground. .

[0018]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram showing an example of a pipe to be repaired by the repair method according to the present invention. This conduit 10
This is an underground conduit buried underground for the purpose of draining sewage or for other purposes, and is configured by connecting a plurality of concrete fume pipes, ceramic pottery pipes, and the like as units. Inside the pipe 10, a manhole 11,
12 from the ground.
Also, the pipe 10 has a crack 10a due to some cause.
In the present embodiment, the crack 10a is repaired as a repair portion.

For repairing the crack 10a, a liner 13 as a repairing material having a tubular shape as shown in FIG. 2 is used. The liner 13 is roughly constituted by a base hose 14 and a calibration hose 15, and the base hose 14 is an outer layer impermeable film (or sheet) 16 and an outer layer resin impregnated felt 1 impregnated with a liquid thermosetting resin.
The calibration hose 15 is composed of an inner resin absorption felt 18 impregnated with a liquid thermosetting resin and an inner layer impermeable film (or sheet) 19.

The outer layer impermeable film 16 is impermeable so that the uncured thermosetting resin does not permeate or scatter due to evaporation or the like, and is made of polyethylene, polypropylene or the like from the viewpoint of durability and cost. And

The inner layer impermeable film 19 is also impermeable so that the uncured thermosetting resin does not penetrate or scatter, and is made of polyurethane or the like from the viewpoint of smoothness, scratch resistance and durability. I do.

As the thermosetting resin, a liquid epoxy resin or an unsaturated polyester resin is used in consideration of the durability and mechanical properties of the liner 13, and the thermosetting resin is an outer layer resin made of a fiber such as polyester. Impregnated felt 17
And the inner layer resin absorbing felt 18 is impregnated. The outer layer resin impregnated felt 17 and the inner layer resin absorption felt 18 are uniformly mixed with carbon fibers 20 as a conductive material, and a heating current flows through the liner 13 by electromagnetic induction described later.

As shown in FIG. 3, the liner 13 is closed by a plug 21 inserted into one end 13a of the liner 13 to form a bag. The plug 21 is fastened by a fastening band 22 and fixed to one end 13a.
3 is kept airtight.

In order to repair the pipeline 10 using the liner 13, first, the interior of the pipeline 10 is cleaned and observed with a television camera (not shown) to confirm that there is no unsuitable portion for repair. I do.

Next, as shown in FIG.
A roller 23 is provided below the liner 13, and the liner 13 transported from the factory by a refrigerator car 24 in a folded state is attached to one end 1.
It is put underground through the manhole 11 from the side of 3a. A rope 26 extending from a winch 25 on the ground via a roller 23 is attached to the one end portion 13a, and the liner 13 is drawn into the pipeline 10 by winding the rope 26 with the winch 25. And FIG.
As shown in (1), high-pressure air is sent into the inside of the liner 13 by the compressor 27 to expand the liner 13 and
0 on the inner surface 10b.

Here, the liner 13 in the pressed state
The induction coil 28 is arranged inside the inside as shown in FIG.
A control device 29 is arranged on the ground. This induction coil 2
8 is a coil body 30 slightly smaller in diameter than the inner diameter of the liner 13 in a pressed state, as shown in FIG.
A base 31 made of an insulator provided inside the coil body 30; and a coil body 30 provided on the base 31.
A wheel 32 slightly protruding downward from the outer peripheral surface of the vehicle, a motor (not shown) is built in, and provided on the base 31;
The motor further includes a unit 34 that distributes the current sent from the control device 29 through the lead wire 33 to the motor or the coil body 30 and a cover 35 that prevents interference with the lead wire 33 of the wheel 32. When the driving force of a motor (not shown) is transmitted to the wheels 32, the induction coil 28 is remotely operated by the control device 29 and
It can move along zero.

Subsequently, the control device 29 controls the coil body 3
0, an eddy current is generated by electromagnetic induction in the carbon fibers 20 near the portion 13b of the liner 13 facing the coil body 30. When the thermosetting resin impregnated in the outer-layer resin-impregnated felt 17 and the inner-layer resin-absorbing felt 18 is induction-heated by using the eddy current as a heating current, the thermosetting resin in the vicinity of the portion 13b is cured. The current flowing through the coil body 30 is not limited to an alternating current as long as it changes over time, and may be a current having a waveform such as a triangular wave or a rectangular wave whose flow direction does not change (positive or negative does not reverse). Good.

When curing near the portion 13b of the liner 13 is completed, the guiding coil 28 is moved along the liner 13 so that the coil body 30 faces the portion 13c containing the uncured thermosetting resin. An electric current is applied to the coil body 30 again to cure the thermosetting resin in the portion 13c. Thereafter, such a procedure is repeated to cure the liner 13 over the entire length of the conduit 10, but the induction coil 2 is hardened.
Each time the coil 8 is moved, the current flowing through the coil body 30 is not stopped.
May be moved intermittently (while stopping at some places), or the dielectric coil 28 may be moved continuously (without stopping) at a low speed while the current is kept flowing.

When the curing of the liner 13 is completed over the entire length of the pipeline 10, the liner 13 is cut at both ends of the pipeline 10 and the cut end is processed, whereby the inside of the pipeline 10 is processed as shown in FIG. New line 1 with liner 13
3 'is formed. After this repair work, the pipeline 10
Sewage, etc., flowing through the pipe line 13 ',
Since the pipe wall of the pipe 10 including the crack 10a is closed by the pipe wall of the pipe 13 ', infiltration of rainwater and leakage of sewage from the crack 10a are prevented.

In the method of repairing a pipeline according to this embodiment, the thermosetting resin impregnated in the liner 13 is heated by electromagnetic induction without using hot water or steam. Progress can be made evenly.

When heating the thermosetting resin, the pipe 1
The induction coil 28 may be arranged so as to face the liner 13 pressed against the inner surface of the pipe 0, and it is necessary to prepare a large amount of water or steam that fills the pipeline 10 or circulates through the pipeline 10. Therefore, the repair can be performed with simple equipment such as the compressor 27, the induction coil 28, and the control device 29.

Further, since the induction coil 28 can be moved by remote control, the operator can easily carry out the repair work on the ground even if the pipeline 10 is underground.

[0034]

As described above, the pipe repair method according to the present invention is constructed as described above, so that the resin impregnated in the repair material is heated without using hot water or steam, and the curing of the resin is simplified. This has the effect of allowing the equipment to proceed quickly and evenly.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a pipeline to be repaired in a pipeline repair method according to the present invention.

FIG. 2 is an explanatory view showing a liner used for repairing the pipeline of FIG. 1;

3 shows one end of the liner of FIG. 2, (a) is a side view thereof, and (b) is a sectional view thereof.

FIG. 4 is an explanatory view showing a state in which the liner of FIG. 2 is inserted into a pipeline.

FIG. 5 is an explanatory view showing a state where a liner put in a pipeline is expanded by air and pressed against the pipeline.

FIG. 6 is an explanatory diagram showing a state in which an induction coil is arranged inside a liner pressed against a pipeline.

FIG. 7 is an explanatory diagram showing the induction coil of FIG. 6 in an enlarged manner.

FIG. 8 is an explanatory diagram showing a pipeline after repair.

FIG. 9 is an explanatory view showing a conventional pipe line repair method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Underground pipe (pipe) 10a Crack (repair part) 10b Inner surface 13 Liner (repair material) 28 Induction coil

Claims (5)

[Claims] 1. A method of repairing a pipe, in which a repair material impregnated with a resin is applied to a repair portion of the pipe to cure the resin, wherein the resin is cured by induction heating. Repair method. 2. A repair material is mixed with a conductive material, and the repair material is pressed against an inner surface of the conduit, and an induction coil is disposed inside the conduit so as to face the repair material.
The method for repairing a pipeline according to claim 1, wherein the resin is cured by heat generated by flowing an electric current through the induction coil and flowing an induced current through the conductive material. 3. The method according to claim 2, wherein the induced current is generated by passing a current that varies with time through the induction coil. 4. The method according to claim 3, wherein the current that changes with time is an alternating current. 5. The pipeline repair method according to claim 2, wherein the induction coil is movable by remote control from outside the pipeline.