JP3773046B2 - Method for forming a tube in a pipeline - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for forming a new rigid pipe along the inner surface of a pipe for the purpose of repairing the pipe, and in particular, a synthetic resin having rigidity such as polyethylene in the pipe. It relates to a method of forming a tube.
[0002]
[Prior art]
Conventionally, a synthetic resin pipe having a certain degree of rigidity, such as polyethylene, is inserted through a long length by pushing or pulling from one end of the pipe, and the pipe is lined with the pipe. Yes.
[0003]
However, in this method, when the pipe has a bent portion or the like, the pipe cannot follow the bending, and may not be able to be inserted over the entire length of the required portion of the pipe. It was considered that the pipe was inserted into the pipe line by a reversal method with the flexibility given by heating.
[0004]
In the reversal method, the hose-shaped flexible lining material is reversed so that the inner side becomes the outer side by the fluid pressure, and the inverted portion is advanced in the pipe line, and the reversed lining material is moved to the inner surface of the pipe line by the fluid pressure. This is a method of lining a pipe line by curing a curable resin liquid impregnated into a lining material and impregnating the lining material.
[0005]
In this method, the inverted lining material can also be bonded to the inner surface of the pipeline with a curable resin liquid, but the rigid material released from the pipeline in the pipeline without bonding the lining material and the pipeline. Tubes are also formed.
[0006]
Thus, pipes such as polyethylene are much stiffer than lining materials in normal reversal methods, so it is not possible to invert such pipes so that the inside is the outside, but heating this pipe Therefore, the above-mentioned reversal method is applied by giving the pipe enough flexibility to allow reversal.
[0007]
However, even if a pipe such as polyethylene is heated to impart flexibility, it is difficult to impart a high degree of flexibility that can be reversed only by fluid pressure, and excessive flexibility. If the property is imparted, there is a possibility that problems such as the pipe swelling and deforming at the inverted portion or rupturing may occur.
[0008]
Thus, in the reversal method, a long string-like object is inserted through the entire length of the lining material, and the long string-like object protruding from the reversing portion is pulled through the pipeline, There is a method of assisting inversion and inducing the progress of the inversion portion at the bent portion, which is described in Japanese Patent Publication No. 59-12911.
[0009]
FIG. 4 shows this method. A pressure vessel 2 is provided at one end of a pipe 1, and a terminal of a lining material 4 is coupled to a discharge port 3 of the pressure vessel 2. The fluid pressure acts on the inversion portion 5 of the lining material 4, and the lining material 4 advances in the pipe line 1 while inverting so that the inside becomes the outside.
[0010]
A string-like long object 6 such as a belt is inserted into the non-inverted lining material 4, the string-like long object 6 protrudes from the reversing part 5, and the tip thereof is from the other end side of the pipe line 1. It is towed by the towing device 7.
[0011]
Thus, in this method, the inner surface of the non-inverted lining material 4 is pressed into contact with the string-like long object 6 by fluid pressure, and the string-like elongated object 6 is pulled, as shown in FIG. 4 and pulling the non-inverted portion of 4 to promote inversion in the inversion portion 5, and in the bent portion 8 of the conduit 1, the string-like long object 6 suppresses the inversion by suppressing the inside of the inversion portion 5. By urging reversal of the outside of the bend, the reversal portion 5 can smoothly pass along the bend 8 and be lined.
[0012]
[Problems to be solved by the invention]
However, when this method is applied to the reversing method performed on the pipe 9 such as polyethylene instead of the lining material 4, the surface of the pipe 9 is smooth and the friction with the string-like long object 6 is small. When the scale 6 is pulled, the traction force is not properly transmitted to the non-inverted pipe 9, and only the string-like long article 6 partially slides from the pipe 9 and is not inverted as shown in FIG. 3. The pipe 9 may buckle in a bellows shape and may not be a force that promotes the reversal of the pipe 9 in the reversal portion 5.
[0013]
Further, once such buckling occurs, even if the buckled portion reaches the reversal portion 5, the habit caused by buckling remains, and the reversal portion 5 cannot be smoothly reversed, and the reversal proceeds. Is impossible.
[0014]
This invention is made | formed in view of this situation, Comprising: It aims at providing the method which can form a pipe | tube in the pipe line 1 smoothly by the reversal method using the pipes 9, such as said polyethylene. To do.
[0015]
[Means for Solving the Problems]
Thus, the present invention inserts a pulling member made of a two-layered strip-like long object into a pipe having the rigidity of a thermoplastic synthetic resin, and the outer surface of the long object in the pulling member is connected to the inner surface of the pipe. Adhering in a peelable manner, the pipe is heated to give flexibility, and while the fluid pressure is reversed so that the inside becomes the outside, the pulling member protruding from the reversed portion is pulled through the pipeline. By guiding the non-inverted pipe bonded to the traction member to the reversal part, guiding the pipe to the outside with the traction member at the reversal part and detaching it while reversing, and allowing the reversal part to advance in the pipeline An inverted pipe is arranged in the pipeline. In the present invention, it is preferable to use a steel strip or a woven belt as the strip-like long object.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a method of forming a pipe in a pipe line 1 by a reversal method according to the present invention, and is a central longitudinal sectional view showing an inverted part of a pipe 9.
[0017]
Thus, in this method, a flexible pulling member 10 is inserted into a non-inverted polyethylene pipe 9 used for the reversal method, instead of the string-like long object 6 in the above-described method. The pulling member 10 is formed by inserting two belt-like long objects such as woven belts and steel strips, and the outer surface thereof is detachably bonded to the inner surface of the pipe 9.
[0018]
When the synthetic resin constituting the pipe 9 is polyethylene, since polyethylene is a material with particularly poor adhesion, a pulling member using a solution adhesive of rubber or vinyl resin or an emulsion adhesive is used. By adhering 10, temporary adhesion can be performed in a state where it can be peeled off when a strong force is applied.
[0019]
Moreover, even when the pipe 9 is heated to a high temperature in order to give flexibility by adhering using a heat-resistant silicone adhesive, the adhesive strength is not reduced. can do.
[0020]
Thus, in this state, the pulling member 10 protruding from the reversing part of the pipe 9 is passed through the pipe line 1, the pressure fluid is fed into the pressure vessel 2, and the fluid pressure is applied to the reversing part 5. While the pipe 9 is reversed at 5, the reversing portion 5 is advanced along the pipe line 1 while being pulled while being pulled from the pipe 9 at the reversing portion.
[0021]
Since the pipe 9 is made of a rigid synthetic resin such as polyethylene, the reversing method is performed while the pipe 9 is heated and softened to give flexibility so that it can be reversed. As a heating means, the pipe 9 can be heated by feeding a heated pressure fluid into the pressure vessel 2.
[0022]
[Action]
In the present invention, since the traction member 10 is bonded to the pipe 9, when the traction member 10 is pulled, the traction force acts uniformly on the entire non-inverted pipe 9, and the bellows shape as shown in FIG. No buckling occurs.
[0023]
Further, when steel strips are used as the traction member 10, since the frictional resistance of the surface is small, the resistance when towing through the pipe 1 can be reduced, and the pipe 1 has a bent portion such as a 90 ° elbow. However, it can be pulled easily.
[0024]
In addition, since the pulling member 10 is a two-layer belt-like long object and the pulling member 10 is bonded to the pipe 9, the reversing portion 5 of the pipe 9 is accompanied by the reversal of the pipe 9, as shown in FIG. After the pulling member 10 is opened to some extent, it is peeled off from the pipe 9.
[0025]
Therefore, by pulling the pulling member 10, the pulling member 10 not only pulls the non-reversed pipe 9 toward the reversing portion 5, but also has a function of forcibly reversing the pipe 9 outward at the reversing portion 5. Have.
[0026]
When a steel strip is used as the traction member 10, since the steel strip has a considerable rigidity, the radius of curvature at the bent portion of the pipe line 1 is increased, and the contact area with the inner surface of the pipe line 1 is increased. The frictional resistance is reduced and the pipe 9 can be smoothly reversed by being pulled with a relatively small force.
[0027]
【The invention's effect】
Therefore, according to the present invention, even in a pipe 9 made of a material that is difficult to apply the reversal method, such as polyethylene, the non-reversed pipe 9 does not buckle in a bellows shape and cannot be reversed. In the portion 5 as well, the pulling member 10 adhered to the pipe 9 promotes the reversal, and the reversing method can be performed smoothly.
[0028]
The present invention is not limited to a method using a synthetic resin pipe 9 such as polyethylene, but can also be applied as it is to a reversal method using a flexible lining material 4 generally used in the past. 5 has an effect of promoting the progress of inversion.
[Brief description of the drawings]
FIG. 1 is a central longitudinal sectional view of a main part showing a state in which a pipe is reversed according to the present invention. FIG. 2 is a central longitudinal sectional view of a main part showing a state in which a lining material is reversed in a conventional reversal method. Fig. 4 is a central longitudinal cross-sectional view of the main part showing the state where the synthetic resin pipe is inverted by the above method.
1 Pipeline 5 Inverted part 9 Pipe 10 Pulling member

Claims (3)

A pulling member (10) made of a strip-like long object is inserted into a pipe (9) having the rigidity of thermoplastic synthetic resin, and the outer surface of the long object in the pulling member (10) is inserted into the pipe (9). Adhering to the inner surface of 9) in a peelable manner, the pipe (9) is heated to give flexibility, and it is inverted so that the inner side becomes the outer side by fluid pressure, while protruding from the inverted part (5) The traction member (10) is pulled through the pipe (1), and the non-inverted pipe (9) bonded to the traction member (10) is guided to the inversion portion (5) and the inversion portion (5 ), The pipe (9) is guided outside by the pulling member (10) and peeled while being reversed, and the reverse portion (5) is reversed in the pipe (1) by being advanced in the pipe (1). A pipe is formed in a pipe line, characterized by arranging a pipe (9) How to The method for forming a pipe in a pipe line according to claim 1, wherein the strip-shaped long object is a steel strip. 2. The method for forming a pipe in a pipe line according to claim 1, wherein the belt-like long object is a woven belt.

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