JP2000274588A - Pipe lining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe lining method easy to control diametrically extending speed and capable of uniformly extend a diameter with no dispersion. SOLUTION: A braid 2 is extended in diameter and deformed by pressure- supplying incompressible fluid R in the cylindrical braid 2 as a diametrically extending means under a lining method to form a lining layer in an existing pipe B by diametrically extending it more than in its inserting state after impregnating the cylindrical braid 2 free to extend and contract in the diametrical direction with unhardened resin 1 by inserting an airtight tube inside and drawing and inserting it into the existing pipe B by dragging it from one end of the existing pipe B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of impregnating an uncured resin into a radially stretchable tubular braid by inserting an airtight tube, pulling the braid from one end of an existing pipe, and pulling it into the existing pipe. The present invention relates to a lining method for forming a lining layer in an existing pipe by increasing the diameter of the pipe after insertion.

[0002]

2. Description of the Related Art Conventionally, as a method of expanding the diameter of an airtight tube-containing tubular braid whose diameter has been reduced by being drawn into an existing pipe of this type, air is supplied under pressure to the tubular braid to expand the braid. A pneumatic diameter expansion method for radially deforming and a pig diameter expanding method for expanding the diameter by moving the pig have been performed.

[0003]

According to the conventional method for expanding the diameter of the tubular braid with the hermetically sealed tube therein, the air pressure expanding method supplies pressurized air into the cylindrical braid.
Since the air is easily compressed, it concentrates on a place having a low resistance rather than a place having a high resistance. As a result, the diameter of the airtight tube-integrated tubular braid varies in diameter, and the diameter cannot be increased uniformly.
Further, in the pig diameter expansion method, the diameter expansion state is easily changed depending on the moving speed of the pig. In other words, if the pig's movement speed is high, it is easy to deform again in the diameter reducing direction after passing through the pig, so it is necessary to control the pig's movement speed (speed of expanding the diameter), but it is difficult because the pig's movement resistance is not constant It is.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a pipe lining method which can easily control the diameter expansion speed and can uniformly expand the diameter without variation.

[0005]

As shown in FIGS. 2 to 6, the characteristic structure of the invention according to the first aspect of the present invention is as follows. , And pulled from one end of the existing pipe B to pull the existing pipe B
A lining method for forming a lining layer A in an existing pipe B by increasing the diameter of the pipe braid after insertion into the tubular braid. And pressurizing the braid 2 to expand and deform the braid 2.

[0006] A feature of the invention according to claim 2 is that the incompressible fluid is a highly viscous liquid as exemplified in Figs.

[0007] As described above, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

According to the first aspect of the present invention, an incompressible fluid is supplied to the air-tight tube in the tubular braid as the diameter-expanding means to pressurize the tubular braid. Because of the point of expanding and deforming, by using an incompressible fluid, a uniform pressure can be applied to the entire tubular braid without being compressed even if the expanding resistance is different.

Accordingly, it is possible to provide a pipe lining method capable of uniformly expanding the diameter of the entire tubular braid. Claim 2
According to the characteristic configuration of the invention, in addition to the effect of the invention according to the first aspect, the incompressible fluid is a highly viscous liquid. A uniform pressure can be applied to the entire tubular braid, and the speed of expanding the braid can be controlled by controlling the injection speed of the highly viscous liquid. Further, if the high-viscosity liquid is kept pressed, the pressure can be easily maintained until the resin is cured. Furthermore, a highly viscous fluid can be recovered and used many times.

Accordingly, it is possible to provide an in-pipe lining method that can uniformly expand and harden the entire tubular braid while controlling the diameter expansion speed, and that is economical.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, portions denoted by the same reference numerals as those of the conventional example indicate the same or corresponding portions.

FIG. 6 shows a tubular airtight tube on the inner peripheral surface B1 of the gas pipe B in order to repair or prevent gas leakage caused by corrosion of a gas pipe buried underground, which is an example of an existing pipe. 3 shows a lining structure of a gas pipe B in which a lining layer A is formed by a braid 2 into which a braid 3 is inserted.

Hereinafter, a pipe lining method according to the present invention will be described with reference to FIGS.

As shown in FIG. 1A, pits D1 and D2 are excavated at both ends of a lining section T of a gas pipe B, and a work vehicle 8 having a winch 8a is made to stand by near one pit D1. Then, the work vehicle 9 having the reel 9a wound with the tubular braid 2 in which the airtight tube 3 is inserted is made to stand by near the other pit D2, and the gas pipe B exposed in each pit D1, D2 is cut. Then, the towing wire W is inserted using a wire passing tool or the like, and one end of the wire W is
a, and the other end of the wire W is wound around the reel 9a and the airtight tube 3 is inserted into the tubular braid 2
Connect to the tip of Then, the wire W is wound up by driving the winch 8a, and the epoxy resin 1 as an example of the uncured resin is drawn into the gas pipe B while impregnating the tubular braid 2 in which the airtight tube 3 is inserted. As shown in (b), the tubular braid 2 in which the airtight tube 3 is inserted is inserted through the entire length of the gas pipe B.

The tubular braid 2 is made of a high-strength fiber having an airtight tube 3 forming an airtight layer for maintaining the airtightness of the fluid, and is knitted so as to be able to expand and contract in the circumferential and longitudinal directions. As the wire W is drawn, the diameter of the wire W is reduced while being stretched by the pulling force of the wire W, so that the wire W can be easily inserted into the gas pipe B.

Next, as shown in FIG. 1C, the insertion end of the tubular braid 2 in which the airtight tube 3 is inserted is cut in accordance with the opening end of the gas pipe B facing one pit D1. At the same time, the tubular braid 2 in which the airtight tube 3 on the other pit D2 side is inserted is cut longer, and the cylindrical braid 2 in which the airtight tube 3 reduced in diameter is inserted in one pit D1 is expanded. A non-compressible fluid pressurizing / supplying device 6 as a diameter expanding means is temporarily placed. Then, the cut end of the tubular braid 2 into which the airtight tube 3 is inserted is temporarily fixed to the end of the gas pipe with a jig 7, and the fluid pressurized supply is provided by a connecting portion 6 a provided in the fluid pressurized supply device 6. The device 6 is hermetically connected to the open end of the gas pipe B.

Next, the lining step will be described. As shown in FIGS. 2 to 6, an incompressible and highly viscous material is inserted into the tubular braid 2 in which the airtight tube 3 is inserted from the fluid pressurizing and supplying device 6. Grease R is supplied under pressure as an example of a fluid, and at the pressure of the grease R, the tubular braid 2 in which the airtight tube 3 whose diameter is reduced is inserted is expanded and deformed over the entire length of the section to be lined. . Next, the pressure of the grease R is maintained until the resin 1 impregnated in the tubular braid 2 in which the airtight tube 3 is inserted is cured, and the expanded state is maintained. And
When the resin 1 is cured, the grease R supplied under pressure is removed, the fluid pressure supply device 6 and the jig 7 are removed, and the tubular braid 2 in which the airtight tube 3 is inserted is connected to a gas pipe B. Are cut in accordance with the open end of the gas pipe B, and both ends thereof are pressed against the inner peripheral surface B1 of the gas pipe B with the radially expanding urging ring 5, and the tubular braid 2 in which the airtight tube 3 is inserted and the gas pipe B Seal between

[Another Embodiment] Another embodiment will be described below. <1> The incompressible and highly viscous fluid R is not limited to the grease described in the above embodiment, but may be, for example, a one-component caulking material. Any fluid that is incompressible and has high viscosity is optional. <2> The lining method according to the present invention uses the existing gas pipe B
Not only that, it may be applied to the lining of an existing water pipe or sewer pipe. <3> The lining method according to the present invention not only rectifies the existing pipe, but also secures the same strength as the newly installed pipe by the tubular braid 2 itself, which is formed by curing the impregnated resin 1 and keeping its shape. Thus, it may be used substantially for updating existing pipes.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a lining method.

FIG. 2 is an explanatory view of a lining step.

FIG. 3 is an explanatory view of a lining step.

FIG. 4 is an explanatory view of a lining step.

FIG. 5 is an explanatory view of a lining step.

FIG. 6 is an explanatory view of a lining step.

[Explanation of symbols]

 A lining layer B gas pipe 1 resin 2 tubular braid 3 airtight tube R fluid

Claims (2)

[Claims] 1. An airtight tube is inserted into a tubular braid which is radially stretchable and impregnated with an uncured resin, pulled from one end of an existing pipe, drawn into the existing pipe, inserted therethrough, and inserted therethrough. A lining method for forming a lining layer in an existing pipe by expanding the diameter of the tubular braid, wherein the non-compressible fluid is pressure-supplied into the cylindrical braid as the diameter expanding means to expand and deform the cylindrical braid. In-tube lining method. 2. The method according to claim 1, wherein the incompressible fluid is a highly viscous liquid.