JPH11240072A - Repairing of existing pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an existing pipeline repairing method capable of properly applying inner lining even to a long extended execution pipe. SOLUTION: In a first process, an adhesive is introduced into an existing pipeline 1 in a plug shape from one end opening part 1a of the pipeline 1 and an adhesive lining film 31 is formed on the inner surface of the existing pipeline 1 by pig lining and, in a second process, a leading pig 6 is introduced into the existing pipeline 1 from the opening part 1a provided in one end thereof and a small amt. of the adhesive 3' is introduced into the rear stage of the leading pig 6 in a plug state and the leading end part of an inner lining. tube 7 is reversely introduced into the opening part 1a provided in one end of the pipeline 1 in the rear stage of the plug-shaped adhesive 3' and a suction device 5 is arranged to the opening part provided in the other end of the pipeline 1 and negative pressure is generated in the pipeline by the suction device 5 to move the leading pig 6, the adhesive 3' and the lining tube 7 to the other end of the pipeline to bond the lining tube 7 to the inner surface of 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 an existing pipeline, such as a gas pipe, a water pipe, etc., for the purpose of maintenance of the pipeline. Repair method.

[0002]

2. Description of the Related Art Various techniques have been developed for repairing existing pipelines by digging without burying existing pipelines. For example, there are a resin lining method in which a resin lining film is formed on the inner surface of the pipe, and a lining method in which a flexible lining tube is introduced into the pipe by inversion / non-inversion to be in contact with the inner surface of the pipe.

[0003] Among the above repairing methods, the present applicant has previously proposed a lining inversion method shown in FIG. First, one or two leading pigs b having a diameter slightly larger than the inner diameter of the conduit are introduced into the conduit from one end opening of the conduit a, and then applied to the inner surface of the conduit a. Introduce the required amount of adhesive c behind the leading pig b,
The lining tube e is reversely introduced so as to be adjacent to the adhesive c, and a suction device f is attached to the other end opening of the pipeline to generate a negative pressure in the pipeline. A method was proposed in which the lining tube was introduced into the conduit while the leading pig and the adhesive were moved to the other end of the conduit, and the lining tube was bonded to the inner surface of the conduit with the leading adhesive.

[0004]

In the above-mentioned method, when the pipeline to be constructed is long, the amount of the adhesive introduced into the pipeline naturally increases. Therefore, the frictional resistance of the adhesive increases, and the moving speed of the leading pig, the adhesive, and the lining tube decreases. As a result, not only does the construction time take a long time, but in the worst case, the adhesive is hardened, which causes a problem that the construction cannot be continued.

The present invention has been devised to solve these problems, and an object of the present invention is to provide a method of repairing an existing pipeline capable of properly lining a long-length construction pipe. Is what you do.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a flexible lined tube which is introduced into an existing conduit by inverting a flexible lining tube into the conduit through an opening at one end thereof. In a method of repairing an existing pipeline to be attached, as a first step, an adhesive is introduced into the pipeline as a plug from one end opening of the existing pipeline, and an adhesive is applied to the inner surface of the existing pipeline by lining means. Forming a lining film, and as a second step, fixing the tip of the lining tube in a state where the tip of the lining tube is inverted and introduced into one end of the conduit, and disposing a suction device at the other end of the conduit, A negative pressure is generated in the pipe line by the suction device, and the liner tube is moved to the other end side of the pipe line by the negative pressure, whereby the liner tube is adhered to the pipe inner surface by the adhesive adhered to the pipe inner surface. It is characterized by being constructed as follows.

As another means, in a method of repairing an existing pipeline, a flexible lining tube is introduced into the pipeline from the one end opening of the existing pipeline while inverting the tube, and adhered to the inner surface of the pipeline. As one step, an adhesive is introduced in a plug form from the one end opening of the existing pipeline into the pipeline, and a lining film of the adhesive is formed on the inner surface of the existing pipeline by lining means. A leading pig is introduced into the pipe from one end opening of the existing pipeline, a small amount of adhesive is introduced into the pipe in a flag-like manner after the leading pig, and one end of the pipeline is provided after the plug-like adhesive. The tip of the lining tube is inverted and introduced into the opening, and the tube is fixed.A suction device is provided at the other end of the pipe, and a negative pressure is generated in the pipe by the suction device. Lead pig, glue, lining tube by pressure By moving into, characterized by construction to bonding the lining tube into the tube surface.

Further, as the lining means, a lining pig having an outer diameter slightly smaller than the inner diameter of the existing pipeline is provided in a stage subsequent to the adhesive introduced in a plug shape from one end opening of the existing pipeline. A suction device is disposed at the other end opening of the existing pipeline, and the lining pig is moved by negative pressure to form a lining film on the inner wall surface of the pipeline.

Further, the leading pig has an outer diameter slightly smaller than the inner diameter of the conduit, and is formed of a sponge material having elasticity.

[0010]

In the method of repairing an existing pipeline according to the first aspect of the present invention, a lining film of an adhesive is formed on the inner wall surface of the pipe in the first step. Then, as a second step, first, the inner surface of the lining tube is turned outward at the one end opening of the existing pipeline, and the tube is mounted. Then, a suction device is attached to the other end opening of the conduit to generate a negative pressure in the conduit. Then, the liner tube is drawn into the pipeline while being inverted by the negative pressure. At this time, since the adhesive is applied to the inner surface of the tube, the tube is appropriately adhered to the inner surface of the tube.

In the method of repairing an existing pipeline according to the second, third, and fourth aspects of the present invention, a lining film of an adhesive is formed on the inner wall surface of the pipe by, for example, pig lining in a first step. Then, as a second step, first, a leading pig having an outer diameter that does not gouge the adhesive lining film formed in the first step from one end opening of the existing pipeline is introduced into the pipeline. Then, a small amount of adhesive is introduced in a plug shape so as to be adjacent to the leading pig, and the inner surface of the lining tube is folded outward at the one end opening, and the tube is mounted. Then, a suction device is attached to the other end opening of the conduit to generate a negative pressure in the conduit. Then, the leading pig moves to the other end side of the pipeline while sealing the adhesive by the negative pressure, and at the same time, the lining tube is drawn into the pipeline while being inverted. At this time, even if the adhesive lining film formed in the first step has unevenness, the plug-shaped adhesive compensates for the unevenness, and the lining tube is appropriately adhered to the inner surface of the tube.
Further, at this time, the amount of the adhesive introduced into the pipe is small even though the length of the pipe is long, so that the construction time is not prolonged.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an existing pipeline repair method of the present invention. In FIG. 1, reference numeral 1 denotes an existing pipeline to be buried underground and is a relatively long pipeline.

The procedure of the repair method according to the present invention is as follows:
As a process, one end opening 1a of the existing pipeline 1
The required amount of adhesive 3 to be applied to the inner surface of the is inserted in a plug shape, and the lining pig 4 is arranged at the subsequent stage of the adhesive 3.
The outer diameter of the lining pig 4 is slightly smaller than the inner diameter of the existing pipeline 1. Next, the suction device 5 is connected to the other end opening 1b of the conduit 1. Here, the suction device 5 includes a pressure gauge 51 that detects and displays the pressure in the pipeline 1,
A valve 52 is provided so that the pressure in the pipe 1 is kept constant while adjusting the valve 52. Then, by operating the suction device 5, a negative pressure is generated in the pipeline 1. Then, the lining pig 4 moves to the other end opening 1b side of the pipeline while lining the adhesive 3 due to the negative pressure. As a result, a lining film 31 of an adhesive is formed on the inner wall surface of the existing pipeline 1.

Next, as a second step, a leading pig 6 is introduced into the pipeline 1 from one end opening 1a of the existing pipeline 1.
The leading pig 6 is formed of a sponge, and is a spherical pig having an outer diameter slightly smaller than the inner diameter of the existing pipeline 1. More specifically, when the leading pig 6 passes through the existing pipeline 1, it has an outer diameter that does not gouge the lining film formed in the first step.

Next, the adhesive 3 ′ is introduced into the pipe 1 in a plug-like manner so as to be located on the rear side of the leading pig 6. The adhesive 3 ′ is the same as the adhesive 3 used in the first step. Usually, a large amount of adhesive is used to attach the lining tube 7 to the inner surface of the long and existing pipe 1. Need
In the case of the present invention, since the lining film 31 of the adhesive is previously formed on the inner surface of the existing pipeline 1 in the first step, the adhesive is basically not required. However, the lining film 3
First, the adhesive 3 ′ is introduced into the pipeline 1 in case of unevenness or the like, so that the adhesion of the lining tube 7 can be more reliably performed.

Further, at the subsequent stage of the adhesive 3 ',
The front end of the lining tube 7 is folded back to the one end opening 1 a of the pipe 1 so as to be fixed to the one end opening 1 a of the pipe 1. The lining tube 7 is formed of a flexible fiber, and is wound around the reel device 72 in a flat shape. A pulling wire 71 is connected to the end of the lining tube 7 and wound around the reel device 72.

Next, a suction device 5 is connected to the other end opening 1b of the pipeline 1. By operating the suction device 5, a negative pressure is generated in the pipeline. Then, while the leading pig 6 seals the adhesive 3 ′ by the negative pressure, that is, while preventing the adhesive 3 ′ from moving toward the opening 1 b before the leading pig 6, the leading pig 6 closes the opening 1 b of the pipeline. , The lining tube 7 proceeds while being turned inside out in the pipeline 1, and is securely adhered to the inner surface of the pipeline 1.

[0018]

According to the existing pipe repair method of the present invention, a lining film of an adhesive is formed on the inner wall surface of the pipe in the first step. Then, as a second step, first, the inner surface of the lining tube is turned outward at the one end opening of the existing pipeline, and the tube is mounted. Then, a suction device is attached to the other end opening of the conduit to generate a negative pressure in the conduit. Then, the liner tube is drawn into the pipeline while being inverted by the negative pressure. At this time, since the adhesive is applied to the inner surface of the tube, the tube is appropriately adhered to the inner surface of the tube.

In the method of repairing an existing pipeline according to the second, third, and fourth aspects of the present invention, a lining film of an adhesive is formed on the inner wall surface of the pipe by, for example, pig lining in a first step. At this time, even if the adhesive lining film formed in the first step has irregularity, the plug-like adhesive compensates for this,
The lining tube is properly adhered to the inner surface of the tube. And at this time, the amount of adhesive to be introduced into the pipe is small, despite the lengthening of the pipe, so that the working time is not prolonged, so that the adhesive does not harden during the work. .

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first step of a method of repairing an existing pipeline in the present invention.

FIG. 2 is an explanatory view showing a second step of a repair method for an existing pipeline in the present invention.

FIG. 3 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing piping 1a Opening 1b Opening 3 Adhesive 3 'Adhesive 4 Lining pig 5 Suction device 51 Pressure gauge 52 Valve 6 Leading pig 7 Inner tube 71 Traction wire 72 Reel

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[Procedure amendment]

[Submission date] March 3, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

Claims (4)

[Claims] 1. A method of repairing an existing pipeline, in which a flexible lining tube is introduced into the pipeline while being inverted from one end opening of the existing pipeline and is adhered to the inner surface of the pipeline, as a first step. An adhesive is introduced into the pipeline in a plug form from one end opening of the existing pipeline, and a lining film of the adhesive is formed on the inner surface of the existing pipeline by a lining means; At one end opening, the tip of the lining tube is turned upside down and fixed, and a suction device is arranged at the other end opening of the above-mentioned pipeline, and a negative pressure is generated in the pipeline by the suction device. A method for repairing an existing pipeline, wherein the lining tube is moved to the other end of the pipeline by a negative pressure, so that the lining tube is adhered to the interior surface of the pipeline with an adhesive adhered to the interior surface of the pipeline. . 2. A method of repairing an existing pipeline, in which a flexible lining tube is introduced into the pipeline from the one end opening of the existing pipeline while being turned over and adhered to the inner surface of the pipeline, as a first step. An adhesive is introduced in a plug form into the pipeline from one end opening of the existing pipeline, and a lining film of the adhesive is formed on the inner surface of the existing pipeline by lining means. A leading pig is introduced into the pipe from one end opening of the passage, a small amount of adhesive is introduced into the pipe in a flag-like manner after the leading pig, and the leading end pig is introduced into the pipe one end opening after the plug-like adhesive. The tip end of the lining tube is reversed and fixed, and a suction device is disposed at the other end opening of the above-mentioned conduit, a negative pressure is generated in the conduit by the suction device, and the suction is performed by the negative pressure. Move the pig, adhesive, and lining tube to the other end of the pipeline It makes repair method of the existing pipeline, characterized in that the construction to bonding the lining tube into the tube surface. 3. As the lining means, after the adhesive introduced in a plug shape from one end opening of the existing pipeline,
A lining pig having an outer diameter slightly smaller than the inner diameter of the existing pipeline is introduced into the pipeline, a suction device is disposed at the other end opening of the existing pipeline, and the lining pig is moved by negative pressure. The method for repairing an existing pipeline according to claim 1, wherein a lining film is formed on an inner wall surface of the pipeline. 4. An existing pipeline according to claim 2, wherein said leading pig has an outer diameter slightly smaller than an inner diameter of said pipeline and is formed of a sponge material having elasticity. Repair method.