JPH09314018A - Partial repair method for existing pipelines and lining equipment used for the same method - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To reduce wasteful consumption of resin for lining when rehabilitating an existing pipeline to reduce repair cost. SOLUTION: A lining device C is composed of a resin tank 4 formed to have an outer diameter that allows passage in a pipeline, and a pig 5 connected to the rear part of the resin tank. Traction means 6 connected to the front of the tank 4.
And a resin discharge nozzle 41 opened at the rear of the tank, and a fluid pressure supply means (compressor 9) capable of stopping the supply of a required fluid pressure in the tank in a pressurized state or a non-pressurized state. When lining the existing pipeline, during the process of introducing the lining device C into the pipe from the opening 1A at one end of the pipeline and moving it toward the other opening 1B, the lining device C measures the defective position of the pipeline measured in advance. When passing through, the fluid pressure from the compressor 9 is supplied to cause the contained resin E in the tank 4 to flow out into the pipe from the nozzle 41, and the outflowing resin is applied to the inner surface of the pipe by the pig 5 that moves following the rear part of the tank. Partial lining construction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention implements a partial repairing method of an existing pipeline for partially repairing a defective portion existing in the existing pipeline from the inside of the pipe by using an epoxy resin, and this construction method. The present invention relates to a lining device used at that time.

[0002]

2. Description of the Related Art Gas and water supply pipelines are
A main pipe and branch pipes serving as low-pressure conduits are laid under the road, and a large number of supply pipes are branched from these conduits to form a piping system for supplying gas and the like to peripheral customers. Many of the above-mentioned branch pipes and supply pipes are laid with steel pipes so-called “white gas pipes”, and pipes buried with this kind of steel pipes due to corrosion progress when the laying burial period is long Deterioration may cause defective parts such as leak holes in the pipe. Conventionally, there has been proposed a rehabilitation repair method in which a lining film is formed on the inner surface of a pipe by using an epoxy resin for the purpose of regenerating such a deteriorated pipe.

[0003]

Conventionally, in the above-mentioned resin lining method, the epoxy resin introduced into the pipe for the entire area of the pipe is used for the inner surface of the pipe by an air flow conveying method, a pick conveying method, a differential pressure conveying method or the like. A general method is a method of forming a lining film having a required film thickness over the entire area.

By the way, in a pipeline that needs rehabilitation, a defective portion such as a leak hole caused by the progress of corrosion rarely occupies the entire area of the pipeline, and in some cases, it may partially occur. Many. When rehabilitation repair is performed on such pipelines, applying the conventionally proposed resin lining method will cause lining work to be performed over the entire area of the pipeline, including the defective part that needs repair, There is a problem that the consumption of resin is large and the repair cost is high.

The present invention provides a method of partially repairing an existing pipeline for partially lining and repairing only a defective portion that needs repair in order to reduce repair costs, and a lining device used for carrying out this method. The purpose is.

[0006]

In order to achieve this object, the invention according to claim 1 is connected to a resin tank formed to have an outer diameter that allows passage in a pipe and a rear portion of the resin tank. A lining device is composed of the pig, and the lining device includes a traction means connected to the front part of the resin tank, a resin discharge nozzle opened to the rear part of the tank, and a required fluid pressure applied to the tank. And a fluid pressure supply means capable of supplying and stopping in a pressurized state or a non-pressurized state, and the pig is formed to have an outer diameter dimension required to form a required lining film with respect to the inner diameter of the pipe line. In the lining construction of the passage, during the process of introducing the lining device from the one end opening portion of the pipeline and moving it toward the other opening portion, when the lining device passes the defective position of the pipeline measured in advance, Fluid pressure supply By operating the unit was drained into the tube from a nozzle resin liquid in the tank, it is characterized in that the partial construction as applied to the tube surface in the pig to follow the spilled resin liquid tank rear.

Further, according to a second aspect of the present invention, with respect to the existing pipeline for pulling and moving the lining device, a pressure difference is created between the inside of the pipeline on the front side and the inside of the pipeline on the rear side in the traveling direction of the lining device. It is characterized by having a means for causing it.

Further, the invention according to claim 3 relates to a lining device used for a partial repairing method of an existing pipe, the lining device having a resin tank formed to have an outer diameter capable of passing through the pipe, A pig connected to the rear of the resin tank, the resin tank has a traction means at the front,
The rear part is provided with a resin discharge nozzle and a fluid pressure supply means capable of supplying and stopping a required fluid pressure in the tank in a pressurized state and a non-pressurized state, and the pig is provided with a required lining film for the inner diameter of the conduit. It is characterized in that it is formed to have an outer diameter dimension necessary for forming.

Further, the invention according to claim 4 relates to a lining device used in a method for partially repairing an existing pipeline, wherein the resin tank and the pig following the rear part are connected by a flexible elastic member. When the lining device passes through the curved pipe portion of the pipe line, the resin tank and the pig are connected to each other so that they can be bent.

[0010]

According to the invention as set forth in claim 1, the lining device passes through the inside of the pipeline without discharging the stored resin from the inside of the tank in the pipeline where the defective portion is not generated with respect to the existing pipeline. However, the lining construction can be controlled so that the contained resin is discharged from the tank and partially applied to the inner surface of the pipe by a pig at the position where the defective portion is generated. As a result, it is possible to use the lining while achieving the required rehabilitation repair purpose because the lining work can be performed only on the defective portion that needs repair without unnecessary lining work on the part that does not need repair. It is possible to reduce the amount of resin consumed and reduce the repair cost.

Further, in the invention described in claim 2, when the lining device is moved in the pipe line in which the defective portion is not generated, the movement of the lining device is promoted by the pressure difference generated in the pipe before and after that. To reduce traction resistance. Also, when performing lining work at a defective part, the resin discharged from the tank due to the pressure difference before and after the lining device causes a phenomenon that it flows up in the pipe and the film can be formed properly by the pig. Like

Further, according to the lining device of the present invention as defined in claim 3, it is possible to control the discharge and stop of the resin contained in the tank when the pipe is moved, so that the portion corresponding to the existing pipe can be controlled. Lining construction can be achieved.

According to the invention described in claim 4,
The passage of the lining device can be smoothed even in a curved pipe portion such as an elbow interposed in the pipe when the lining device is moved in the pipe.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a schematic diagram showing a construction mode of the method of the present invention, in which an existing pipeline to be repaired is a branch pipe as a low pressure conduit which is buried under a road L as a gas supply pipeline. 1 and a large number of supply pipes 2 branched from this branch pipe 1 and drawn into the surrounding demand destination D. These pipe lines are filled with steel pipes commonly called "white gas pipes". In the present embodiment, an example in which the interior of the branch pipe 1 is rehabilitated is described in the case of the target pipeline that needs rehabilitation repair after a long burying period.

When performing rehabilitation repair, the construction extension is decided, two shafts A and B on the starting side and the arrival side are excavated on the ground, the branch pipe 1 is separated at this position, and openings 1A and 1B are provided. . Prior to the repair of the branch pipe 1, the location of the defective portion to be repaired in the pipeline is checked in advance by a well-known sonic flaw detection method or a leak test based on internal pressure fluctuation.

For the branch pipe 1 in which the defective portion is generated,
In the case of the present embodiment, the lining device C composed of the resin tank 4 and the pig 5 shown in FIG. 2 is introduced into the pipe through the opening 1A on the starting side, and is moved in the pipe toward the opening 1B on the arrival side. FIG. 2 is a cross-sectional view showing the configuration of the lining device C, and the resin tank 4 constituting the device C is a tank main body 4
A and a guide member 4B provided around the main body 4A. The tank main body 4A is composed of a cylinder having a space capable of accommodating the epoxy resin E for lining inside, and a discharge nozzle 41 for discharging the accommodating resin E into the pipe of the branch pipe 1 is circumferentially provided at the rear portion of the tank main body 4A. Are formed along the line. The guide member 4B is the tank body 4
The resin tank is formed of a corrugated elastic member integrated on the outer periphery of A, and the guide member 4B contacts the inner wall surface of the branch pipe 1 so that the center position of the tank body 4A coincides with the center position of the branch pipe 1. 4 is made slidable in the branch pipe 1. As described above, when the resin tank 4 is moved by the guide member 4B so as to coincide with the center position in the branch pipe 1, a gap between the opening position of the nozzle 41 provided in the tank body 4A and the inner wall surface of the branch pipe 1 is formed. Are defined in the required intervals.

The tank body 4A is equipped with a traction means 6 for inserting the lining device C from the opening 1A on the starting side and moving it to the opening 1B on the reaching side. In the present embodiment, a flexible hose wire having a hollow inside connected to the front portion of the tank body 4A is used as the pulling means 6, and the inside of the hose wire 6 has a fluid pressure supply passage 6 described later.
An example that is also used for a is shown. As shown in FIG. 1, the pulling means 6 made of this hose wire is connected at its distal end in the extension direction to a winch 8 installed on the ground of the reaching shaft B, and the tank body 4A is moved by the winding operation of the winch 8. It is adapted to be moved toward the opening 1B on the arrival side.

The end of the hose wire wound around the winch 8 in the extending direction (communication means 6) is connected to the winch 8 and a compressor 9 (fluid pressure supply means) with a regulating valve installed on the ground. The fluid pressure from 9 can be applied to the inside of the resin tank 4 through the passage 6a in the hose wire 6.

Inside the space of the tank body 4A, a piston 10 for transmitting the pressure from the compressor 9 to the lining resin E is installed. The piston 10 is slidably supported in the cylinder of the tank body 4A, and when the fluid pressure from the compressor 9 is supplied, the lining resin E is pressed by the piston 10 to enter the branch pipe 1 from the nozzle 41. When the fluid E is discharged and the supply of the fluid pressure is stopped, the non-pressurized state is reached and the outflow of the resin E is stopped,
The non-pressurized state is maintained so that the resin E does not flow out carelessly.

The pig 5 is provided at a position where the lining resin E discharged from the nozzle 41 can be applied to the inner surface of the pipe. In this embodiment, the resin tank 4
The pig 5, which is connected to the rear portion of the resin tank 4 in a coupled state, is coupled to the resin tank 4 in a bendable state via a coupling member 11 formed of a coil spring having one end attached to the center of the rear portion thereof. The pig 5 has an outer diameter dimension that allows the lining resin E discharged from the nozzle 41 to be applied to the inner surface of the branch pipe 1 with a required thickness.

Next, the lining device C having the above structure
The repairing method of this embodiment, which is performed by using, is constructed by the following procedure. When the repair method is applied, the lining device C is introduced into the pipe through the opening 1A on the starting side of the branch pipe 1, and the winch 8 is operated to move the lining device C to the opening 1B on the arrival side.
Move in the tube toward.

During this moving stroke, when the lining device C passes through a previously measured defective portion of the pipeline, the pulling movement is temporarily stopped or a gradual state is made, and the fluid pressure from the compressor 9 is supplied into the resin tank 4. Let the state. As a result, a pressurizing action is applied to the piston 10, and the lining resin E contained in the tank body 4A flows out from the nozzle 41 and is discharged into the pipeline along with the movement of the piston 10. After the required amount of the resin E is discharged, when the operation of the compressor 9 is stopped to stop the supply of the fluid pressure and the pulling movement of the lining device C is restarted, the resin E discharged into the pipe is stored in the resin tank 4 It is applied to the inner surface of the pipe at the defective portion by the pig 5 that follows the rear portion of the pipe, and the inside of the pipe at the defective portion is partially lined.

In the duct portion where no defect is generated,
While maintaining the fluid pressure from the compressor 9 in a stopped state, the lining device C is pulled and moved so as to be passed through the pipe. When a plurality of defective portions are present in the branch pipe 1 route of the construction section, the above-described procedure is repeated every time the lining device C passes through the defective portions to achieve a desired rehabilitation repair purpose for the branch pipe 1.

The structure of the resin tank 4 shown in the above embodiment may be the structure shown in FIG. Note that, in FIG. 3, the same components as those shown in FIG. 2 are designated by the same reference numerals and the description thereof is omitted. In FIG. 3, the resin tank 40 has a cylinder structure similar to that of the embodiment shown in FIG. 2, but unlike the above-described embodiment, the discharge nozzle 41A for the resin E for lining is located at the rear of the tank body 40A. A single unit is provided at the center position, and the opening at the tip thereof is shaped to open toward the inner bottom of the branch pipe 1.

According to the structure shown in FIG. 3, the structure of the discharge nozzle 41A for the lining resin E can be simplified. Further, in the case of the embodiment shown in FIG. 3, for example, air pressure from a blower 9a is added to the pipe line on the front side in the traveling direction of the lining device C with respect to the branch pipe 1 to be repaired which pulls and moves the lining device C. Means for producing a positive pressure and a negative pressure in the rear pipe line. When such a pressure difference is generated, the resin E discharged from the single discharge nozzle 41A toward the inner bottom of the branch pipe 1 due to the pressure difference generated before and after the lining device C is located in front of the pig 5. The phenomenon of soaring up inside the pipe as shown by the arrow in the space occurs
The coating film can be properly formed by.

[0026]

As described above, according to the present invention as set forth in claim 1, the contained resin is discharged from the inside of the tank in the pipeline portion where the defective portion does not occur in the existing pipeline. As a result, the lining device can pass through the pipe line without passing through, and the lining work can be controlled so that the contained resin is discharged from the tank at the location where the defect occurs and the pig is partially applied to the inner surface of the pipe. Since the lining work can be performed only on the defective portion that needs repair without unnecessary use of the lining work on the part that does not need repair, the resin to be used can be used while achieving the required purpose of pipeline rehabilitation repair. It is possible to reduce the repair cost by reducing the consumption amount.

Further, according to the present invention as set forth in claim 2, when the lining device is moved in the pipe line in which the defective portion is not generated, the movement of the lining device is caused by the pressure difference generated in the pipe before and after that. The phenomenon that the resin discharged from the tank flows up in the pipe in front of the pig due to the pressure difference before and after the lining device is promoted when the lining resistance is reduced and the traction resistance is reduced. When it occurs, the coating film can be properly formed by the pig.

Further, according to the lining device of the present invention as defined in claim 3, it is possible to control the discharge and stop of the resin contained in the tank as desired during the movement of the inside of the pipeline. Partial lining can be performed. In this case, according to the invention described in claim 4, even when the lining device is moved in the pipe, smooth passage of the lining device is achieved even in a curved pipe portion such as an elbow interposed in the pipe line. It is possible to obtain the effect that it can be realized.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining an outline of a method for partially repairing an existing pipeline according to the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a lining device used in the partial repairing method shown in FIG.

FIG. 3 is a cross-sectional view showing another configuration of the lining device used in the partial repairing method shown in FIG.

[Explanation of symbols]

 1 Branch pipe which is one of existing pipelines 4, 40 Resin tank 4A, 40A Tank body 41, 41A Nozzle 5 Pig 6 Hose wire as a pulling means 8 Winch 9 which is a driving device for the pulling means Compressor as a fluid pressure supplying means 10 pistons

Claims (4)

[Claims] 1. A lining device is composed of a resin tank formed to have an outer diameter that allows passage in a pipeline and a pig connected to a rear portion of the resin tank. The lining device includes a resin tank A traction means connected to the front part, a resin discharge nozzle opened to the rear part of the tank, and a fluid pressure supply means capable of stopping the supply of a required fluid pressure in the tank in a pressurized state and a non-pressurized state, The pig is formed to have an outer diameter dimension necessary to form a required lining film with respect to the inner diameter of the pipeline, and when lining the existing pipeline, install the above lining device from one end opening of the pipeline. When the lining device passes through a previously measured defective portion of the pipeline during the process of moving toward the other opening, the fluid pressure supply means is operated to pressurize the resin contained in the tank from the nozzle. In the jurisdiction Issued thereby, partial repair method of the existing pipe line, characterized in that the partial construction as applied to the tube surface in the pig to follow moving spilled resin liquid tank rear. 2. The method for partially repairing an existing pipeline according to claim 1, wherein the existing pipeline for pulling and moving the lining device has a pipeline in a front side in a traveling direction of the lining apparatus,
A method for partially repairing an existing pipeline, characterized by comprising means for producing a pressure difference between the inside of the pipeline on the rear side. 3. A lining device used in the method for partially repairing an existing pipeline according to claim 1, wherein the lining device has a resin tank formed to have an outer diameter that allows passage in the pipeline, The resin tank has a pig connected to the rear portion, and the resin tank has a traction means in the front portion, a resin discharge nozzle in the rear portion, and a required fluid pressure in the tank in a pressurized state and a non-pressurized state. A lining device comprising a fluid pressure supply means capable of supplying and stopping, and the pig is formed to have an outer diameter dimension necessary for forming a required lining film with respect to an inner diameter of the conduit. 4. The lining device used in the method for partially repairing an existing pipeline according to claim 3, wherein the resin tank and the pig connected to the rear portion are connected by a flexible elastic member. The lining device is characterized in that the resin tank and the pig are connected so as to be able to bend each other when the lining device passes through the curved pipe portion of the pipeline.