JPH11245300A - Method for repairing existing pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten an execution time and to certainly remove impurities remaining on the inner wall surface of a pipe to prevent the lowering of the bonding capacity of the tube bonded to the inner surface of an execution pipe by lining reversal. SOLUTION: A guide pig 3 having a polishing agent 3a applied thereto is introduced into an existing pipeline 1 from the opening part 1a provided to one end thereof and a cleaning agent C for cleaning the interior of the pipeline 1 and a necessary amt. of an adhesive 5 applied to the inner wall surface of the pipeline 1 are successively positioned behind the guide pig 3 to be introduced into the pipeline 1 in a plug state and the leading end part of a lining tube 6 fixed to the opening part 1a provided to one end of the pipeline 1 is fixed behind the plug-shaped adhesive 5 in a reversively intoruducing state and a suction device 9 is arranged to the other opening part 1b of the pipeline 1 and negative pressure is generated in the pipeline 1 by the suction device 9 to move the guide pig 3, the cleaning agent C, the adhesive 5 and the lining tube 6 to the other end of the pipeline in series by negative pressure and, in this process, impurities on the inner surface of the pipeline 1 are scraped off and a cleaning process, a process for coating the inner surface of the pipeline with the adhesive and a process for laminating the lining tube 6 are executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversing lining method for repairing or repairing existing pipes such as gas and water pipes as a countermeasure for aging and damage.

[0002]

2. Description of the Related Art Various techniques have been developed so far for repairing existing pipelines in a buried state, such as a resin lining method for forming a resin lining film on the inner surface of a pipeline, There is a lining lining method or the like in which a flexible lining tube is introduced into a pipeline by inversion / non-inversion and adhered to the inner surface of the pipeline.

[0003] Among the above-mentioned construction methods, the lining lining method uses pipes without breaking due to the airtightness and flexibility of the lining tube as compared with the resin lining even when the pipeline is damaged due to an earthquake or the like. Because it can prevent road leakage, it is attracting attention as a method of repairing pipelines that is effective for earthquake countermeasures.

[0004] The lining reverse lining method, which is one of the lining methods, will be further described. In this method, as a preparation stage before construction, first, the lining tube is turned along the inside of the pipe while the traction guide is provided. For this purpose, a step of inserting a traction tool such as a belt through the lining tube and a step of sealing an adhesive for attaching the lining tube to the inner surface of the pipe to be repaired are required. Then, insert the above-mentioned traction tool into the conduit, attach one end of the lining tube to the opening on the base end side of the conduit, and attach a blower or the like to this opening to turn the lining tube upside down. Then, the lining tube is inverted and introduced into the pipe while being pulled by the pulling tool so as to be in contact with the inner surface of the pipe.

[0005] In this lining reverse lining method, as described above, there is a problem that the preparatory work before construction is frequent and the working time is lengthened. Therefore, the following proposals are made as prior art to solve this problem. .

First, according to the method described in Japanese Patent Publication No. 61-20411, as shown in FIG. 5, an inserted mass c is introduced into an installation pipe a through an opening b at one end thereof, and then an adhesive d flows thereinto. Thereafter, the inner surface of the lining tube e is turned outward and fixed to the opening b in an inverted state.
Is pressed and pushed from the opening b side, and the adhesive d
Further, the insertion mass c is advanced to adhere the tube e to the inner surface of the tube.

In order to further improve the above, it is necessary to introduce a leading pig having a diameter slightly larger than the inner diameter of the pipe into the pipe instead of the insertion block c, and then apply it to the inner surface of the pipe. A quantity of adhesive is introduced behind the leading pig, the lining tube e is inverted and introduced adjacent to this adhesive, and a suction device is attached to the other end opening of the pipe, so that a negative pressure is introduced into the pipe. A pressure is generated, and by this negative pressure, the lining tube is also introduced into the pipeline while the leading pig and the adhesive are moved to the other end of the pipeline, and the lining tube is moved to the inner surface of the pipeline by the leading adhesive. Adhesives have also been proposed.

[0008]

However, when the lining inversion lining method is carried out, it is premised that the tube e is adhered to the inner surface of the construction pipe a. There was a problem that the strength was reduced. In other words, when impurities such as rust and dust due to tar and corrosion are present on the inner surface of the installation pipe a, the adhesive applied to those surfaces is released without directly adhering to the inner wall surface of the installation pipe a. Becomes For this reason, after the adhesive is cured, the adhesive layer is peeled off from the inner surface of the installation pipe a, and a portion where the tube e is not firmly integrated with the inner surface of the installation pipe a is generated. Therefore, it is necessary to remove impurities that cause the adhesion failure before the tube e is lined. Therefore, it is necessary to perform a step of cleaning the inside of the installation pipe to wash and remove impurities before the installation of the lining. However, if such a washing step is newly provided, since many steps such as introduction of a washing apparatus into the installation pipe, washing work, and drying work are required, work required for lining reversal lining is increased. Work time will be lengthened. In addition, impurities may not be completely removed by simply washing, and in this case, it is not possible to ensure the adhesive strength between the tube e and the adhesive.

SUMMARY OF THE INVENTION In view of the above problems in the conventional lining inversion lining method, the object of the present invention is to shorten the construction time and to remove the impurities remaining on the inner wall surface of the pipe without fail so that the lining is reversed. It is an object of the present invention to provide a method of repairing an existing pipeline, which can prevent the bonding performance of a tube bonded in the tube from being deteriorated.

[0010]

In order to achieve the above object, according to the present invention, a flexible tube is inserted into an existing pipe from the one end opening of an existing pipe buried underground. In the repairing method of the existing pipeline to be introduced while inverting and sticking to the inner surface of the pipeline, a leading pig having an abrasive on the surface is introduced into the pipe from one end opening of the existing pipeline, and the leading pig is introduced. In the latter stage, a cleaning agent for cleaning the inside of the pipeline and the necessary amount of adhesive to be applied to the inner wall of the pipeline are sequentially positioned and introduced into the pipe in a plug shape, and at the subsequent stage of the plug-like adhesive, The tip of the lining tube is fixed to the opening at one end of the conduit in a state of being inverted and introduced, and a suction device is disposed at the opening at the other end of the conduit, and the suction device generates a negative pressure in the conduit. Then, the leading pig, the cleaning agent, the adhesive, and the lining tube are successively connected to the pipeline by the negative pressure. In the process of moving to the end side, it is characterized by performing the attaching step of the coating with step and the lining tube of adhesive and scraping process impurities conduit inner surface to the cleaning step and conduit interior surface.

According to a second aspect of the present invention, in the method for repairing an existing pipeline according to the first aspect, the leading pig has an elastic body having an outer diameter slightly larger than the inner diameter of the existing pipeline and a surface thereof. And a polishing agent layer.

[0012]

According to the first and second aspects of the present invention, a negative pressure is generated in the pipeline by the suction device, and the leading pig, the cleaning agent, the adhesive, and the lining tube are sequentially connected to the other end of the pipeline by the negative pressure. In the process of moving to the side, the step of scraping impurities on the inner surface of the pipeline, the cleaning process, the step of applying an adhesive to the inner surface of the pipeline, and the step of attaching the lining tube are performed. Impurities in the tube can be completely removed by the scraping step and the cleaning step.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a schematic view for explaining an existing pipeline repair method of the present invention. In the figure, reference numeral 1 denotes an existing pipeline to be buried underground, and reference numeral 2 denotes an existing pipeline 1.
Is the mains connected to

As shown in the drawing, the existing pipeline 1 to be constructed in this embodiment has a configuration in which a pipe joint such as an elbow A or a socket B is interposed in the middle. In repairing the pipeline 1, as a preparation, the pipeline 1 is first cut from the main pipe 2 once.

As shown in FIG. 2, the procedure of the repair method according to the present invention is as follows. First, the suction device 9 is airtightly connected to the other end opening 1b of the existing pipeline 1, and then the pipe is connected through the one end opening 1a. A leading pig 3 provided with an abrasive 3a capable of scraping impurities present on the inner wall surface of the channel 1 is introduced into the channel 1.

Next, a cleaning agent cassette 20 containing a cleaning agent C for cleaning the inner surface of the pipeline 1 is mounted on the opening 1a at one end, and a required amount of the cleaning agent C is plugged into the subsequent stage of the leading pig 3. Into the pipeline 1 so as to be positioned on the side. Detergent C
Is made of a weakly acidic material capable of dissolving or peeling off impurities such as tar and dust adhering to the inner wall surface of the pipe 1, and an adhesive force of an adhesive described later in accordance with the weakly acidic material. If there is no adverse effect on the water content, a surfactant or the like may be used to remove oil and fat components adhering to the inner surface of the pipeline. At the subsequent stage of the cleaning agent C, a suction pig 4 for sucking the cleaning agent is introduced into the pipe 1, and then the adhesive cassette 21 containing the adhesive 5 is moved to one end opening 1 a of the pipe 1. And the necessary amount of adhesive 5 applied to the inner surface of the pipe 1 is introduced into the pipe 1 so as to be located in the rear side of the leading pig 3 in the form of a plug. Then, at the subsequent stage of the adhesive 5, the tip of the lining tube 6 is turned back to the one end opening 1 a of the pipe 1 so that the inner surface thereof is turned outward, and the one end opening 1
a. In this embodiment, as the adhesive, a) an epoxy resin, b) a thixotropic agent containing finely divided silica as a main component,
c) A lubricant containing spherical fine particles as a main component, and d) a lubricant excellent in compatibility with b) and containing a sufficient amount of a curing agent as a component for curing a) is used.

Here, the leading pig 3 and the sucking pig 4
Is formed of a sponge, the outer diameter of which is
Is a spherical pig having an outer diameter slightly larger than the inner diameter of the spherical pig. The leading pig 3 has a polishing layer in which abrasive grains or abrasives are scattered on the surface of an elastic body such as the above-mentioned sponge or the elastic body, and the polishing layer rubs the inner wall surface of the pipeline 1. Has become. Further, an elastic body such as rubber may be integrated with the suction pig 4 as a partition member in order to prevent mixing of the adhesive 5 and the cleaning agent C located at a later stage. The lining tube 6 is formed of a flexible fiber, and is wound around the reel device 8 in a flat shape.
A pulling wire (not shown) is connected to the end of the lining tube 6 and is wound around the reel device 8 so as to be able to send out and wind up.

The suction device 9 is provided with a pressure gauge 91 for detecting and displaying the pressure in the pipeline 1 and a valve 92. The pressure in the pipeline 1 is kept constant while adjusting the valve 92. I am trying to do it. By operating the suction device 9, a negative pressure is generated in the pipeline. The negative pressure causes the leading pig 3 to polish the inner wall surface of the conduit 1 to scrape impurities and seal the cleaning agent C, that is, to prevent the cleaning agent C from moving forward of the leading pig 3. While moving to the opening 1b side of the pipeline, the suction pig 4 similarly does the same while sealing the adhesive 5, that is, the adhesive 5 moves to the opening 1b side before the suction pig 4. It moves to the opening 1b side of the pipeline while preventing. Further, on the downstream side of the adhesive 5, the lining tube 6 advances while being turned upside down in the pipeline 1. Leading pig 3
In the case where the cleaning agent C located behind can be impregnated to some extent, the cleaning agent C accelerates dissolution or peeling, and enhances the effect of scraping impurities. Further, in this case, the cleaning agent C serves as a lubricant, which also reduces the sliding resistance of the leading pig 3.

At this time, the cleaning agent C after cleaning is sucked by the sucking pig 4 so that the adhesive 5 located at the subsequent stage is sucked.
Of the adhesive is prevented, and the deterioration of the adhesive is suppressed. In this way, the adhesive 5 moves to the inner surface of the pipe after the cleaning, so that only a necessary amount of adhesive is applied to the inner surface of the pipe after impurities are removed from the inner face of the pipe, and air is circulated. The lining tube 6 is adhered to the inner surface of the tube without being inserted by the adhesive 5 applied to the inner surface of the tube. Further, since the lining tube 6 moves in a state adjacent to the adhesive 5, the adhesive 5 is applied to the inner surface of the pipe 1 and also to the folded portion 6a of the lining tube 6 (see FIG. 2). Therefore, the tube 6 can be securely adhered to the inner surface of the conduit.

As shown in FIG. 3, the leading pig 3, the cleaning agent C, the sucking pig 4, the adhesive 5, and the lining tube 6 are guided by the negative pressure and move in the traveling direction, so that each of them has a progressive property. Even if there is a bend in the middle of the pipe, the tube 6 passes smoothly, and the tube 6 is adhered along the inner surface of the pipe while being smoothly inverted.

Further, since the leading pig 3 and the suction pig 4 are formed of a sponge material having an outer diameter slightly larger than the inner diameter of the pipe 1 and having elasticity, the pig is compressed and introduced into the pipe 1. Then, when approaching the step 7 (see FIG. 4) of the pipeline, the diameter can be increased and the pipe can be moved while maintaining the sealing property. As a result, even if the leading pig 3 and the sucking pig 4 reach a place such as the stepped portion 7, no gap is formed between the inner surface of the pipe and the pig. 4 is reliably prevented from flowing forward. Further, although not shown, if water droplets or the like adhere to the inner surface of the conduit 1, the water droplets can be removed (absorbed) by the leading pig 3 or the suction pig 4, thereby preventing poor adhesion due to the water droplets. Will be able to do it.

Further, particularly when the introduction (progression) of the lining tube 6 is deteriorated at a specific place, for example, in a pipe line having many bent portions, the valve 92 of the suction device 9 is operated to operate the pipe line 1. Reduce the negative pressure once. Then, by pulling back the required amount of the lining tube 6, the lining tube 6 is retracted,
The negative pressure in the pipeline 1 is increased again to re-introduce the lining tube 6. In this way, the introduction (progress) of the tube 6 is given a momentum, and even if the introduction is interrupted by an elbow or the like having a sharp bend angle, the introduction of the tube 6 gives a momentum.
The tube 6 can be advanced.

[0023]

As described above, claims 1 and 2
According to the described invention, a suction device generates a negative pressure in a pipe line, and the leading pressure, the cleaning agent, the adhesive,
In the process of moving the lined tube to the other end of the line in a series, the step of scraping impurities and the step of cleaning the inner surface of the line, the step of applying an adhesive to the inner surface of the line, and the step of adhering the lined tube. Are carried out simultaneously, so that impurities in the tube can be completely removed by the step of scraping impurities by the leading pig and the step of cleaning. As a result, it is possible to prevent the work required for the liner reversing lining from being increased and the work time to be prolonged, and it is also possible to completely remove the impurities remaining in the pipe by scraping and washing them, and to adhere to the liner tube. It is possible to guarantee the adhesive strength between the agent and the agent.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a pipeline for explaining a method of repairing an existing pipeline according to the first and second aspects of the present invention.

FIG. 2 is a schematic diagram for explaining an order of members introduced into an existing pipeline shown in FIG.

FIG. 3 is an explanatory diagram showing a construction state at a bent portion of a pipeline.

FIG. 4 is an explanatory diagram showing a construction situation at a step portion of a pipeline.

FIG. 5 is a schematic diagram for explaining a conventional method of repairing an existing pipeline.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing pipeline 1a One end opening 1b Other end opening 2 Main pipe 3 Leading pig 3a Polishing agent 4 Suction pig 5 Adhesive 6 Lining tube 8 Reel 9 Suction device C Cleaning agent

Claims (2)

[Claims] 1. A method of repairing an existing pipeline, in which a flexible tube is introduced into the pipeline from an opening at one end of the pipeline buried in the ground while being inverted, and is adhered to the inner surface of the pipeline. In the above, a leading pig provided with an abrasive on the surface is introduced into the pipe from one end opening of the existing pipe, and a cleaning agent for cleaning the inside of the pipe and a wall surface of the pipe are coated at a stage subsequent to the leading pig. The required amount of adhesive to be applied is sequentially placed and introduced into the pipe in a plug shape. At the subsequent stage of the plug-shaped adhesive, the tip of the lining tube is fixed in a state where the tip of the lining tube is inverted and introduced into the opening at one end of the conduit. Then, a suction device is disposed at the other end opening of the pipe, and a negative pressure is generated in the pipe by the suction device, and the leading pig, the cleaning agent, the adhesive, and the lining tube are sequentially connected by the negative pressure. During the process of moving to the other end of the pipeline, the process of scraping impurities and cleaning Repair method of the existing conduit and executes the attaching step of the process and coat-step and the lining tube of the adhesive to the pipe inner surface. 2. The method for repairing an existing pipeline according to claim 1, wherein the leading pig comprises an elastic body having an outer diameter slightly larger than an inner diameter of the existing pipeline and an abrasive layer on a surface thereof. A method of repairing existing pipelines, characterized by being constructed as follows.