JP3768454B2 - 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 more particularly, a synthetic resin having rigidity such as polyethylene in the pipe. The present invention 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 construction method in which a curable resin liquid impregnated in the lining material is cured to impart rigidity and the pipe line is lined.
[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 the reversal method, so it is not possible to invert such pipes so that the inside is the outside, but as a pressure fluid to invert the pipes By using a heated one, it is considered that the pipe can be provided with a degree of flexibility that allows reversal and the reversal method can be applied.
[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. When the property is imparted, there arises a problem that the pipe swells and deforms due to the fluid pressure at the reversal portion or ruptures.
[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, in which a pressure vessel 2 is provided at one end of a pipe 1, and a lining material 4 is accommodated in the pressure vessel 2, and a lining material is disposed at the discharge port 3 of the pressure vessel 2. 4, the fluid pressure in the pressure vessel 2 acts on the inversion portion 5 of the lining material 4, and the lining material 4 is inverted so that the inner side is the outside in the inversion portion 5. Advances in the pipeline 1 and the inverted lining material 4 is pressed against the inner surface of the pipeline 1 and lined.
[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 brought into pressure contact with the string-like long object 6 by the fluid pressure, and the string-like long object 6 is pulled, so that the non-inverted portion of the lining material 4 is removed. While pulling to promote reversal at the reversal portion 5, the string-like long object 6 suppresses reversal by suppressing the inside of the reversal in the reversal portion 5 at the bent portion 8 of the conduit 1. By being urged, the inversion portion 5 can smoothly pass along the bent portion 8 and can be lined.
[0012]
[Problems to be solved by the invention]
However, when this method is applied to the reversal method performed on the pipe such as polyethylene in place of the lining material 4, the pressure fluid fed to the pressure vessel 2 is heated in order to impart flexibility to the pipe. Since 1 is not heated, it is cooled while the pressure fluid passes through the inverted pipe and reaches the inversion portion 5, and the temperature of the non-inversion pipe is also lowered by the cooled pressure fluid, so that the inversion portion 5 is sufficient. Heat cannot be applied, sufficient flexibility cannot be imparted to the pipe, and even if it is pulled by the string-like long object 6, it cannot be smoothly reversed.
[0013]
Moreover, since the pipe line 1 before the reversal portion 5 of the pipe reaches the reversal portion 5 because the pipe 1 before reaching the reversal portion 5 is at room temperature without being heated, the pipe 1 is rapidly cooled and loses flexibility. , Reversal may be impossible.
[0014]
In addition, a nozzle that ejects a heating fluid such as heated steam may precede the reversing portion 5 and spray the heating fluid from the nozzle toward the reversing portion 5 to heat the reversing portion 5 of the pipe. Is difficult to move in accordance with the traveling speed of the inversion part 5, and only the part where the pipe is exposed from the non-inversion part to the inversion part 5 is heated. It is difficult to provide sufficient flexibility by raising the temperature.
[0015]
The present invention has been made in view of such circumstances, and when a pipe is formed in a pipe line by a reversal method using a thermoplastic synthetic resin pipe such as polyethylene, the reversal portion 5 of the pipe is sufficiently heated. Therefore, it is an object of the present invention to provide a method of imparting flexibility and smoothly reversing.
[0016]
[Means for Solving the Problems]
Thus, in the present invention, the pulling member is inserted into the flexible tube, and the tube is inverted so that the inside is the outside by the fluid pressure by the heated pressurized fluid, thereby forming the inverted portion. Allowing inflow of the heated and pressurized fluid for reversal along the traction member from the free end, and ejecting the heated and pressurized fluid from the inverting portion while passing the traction member protruding from the inverting portion through the pipe line It is characterized by arranging a reversed pipe in the pipeline by pulling and advancing the inverted portion in the pipeline.
[0017]
In this invention, it is preferable that the said pipe | tube is a pipe which has the rigidity of thermoplastic synthetic resins, such as polyethylene, and the flexibility is provided by heating.
[0018]
Further, as the pulling member in the present invention, a string-like or strip-like long object can be used. As the string-like long object, a fiber braid or rope is appropriate, and as the belt-like long object, a fiber belt is appropriate. Further, the fiber belt can be obtained by folding a tubular woven fabric into a flat shape.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a method of forming a pipe by a reversal method in a pipe line 1 according to the present invention, wherein 9 is a pipe made of a thermoplastic synthetic resin such as polyethylene, and a non-inverted portion 9a folded flat. And the already-inverted portion 9 b that is press-contacted to the inner surface of the pipe line 1 are continuous via the inversion portion 5.
[0020]
A belt 10 made of a woven cloth that is flexible and strong as a pulling member is inserted into the non-inverted portion 9a of the pipe 9. By using a flat woven cloth folded as the belt 10, the heated and pressurized fluid described later can easily reach the reversal portion through the inside of the tubular woven cloth.
[0021]
Further, at the free end of the pipe 9, as shown in FIGS. 1 and 2, a control belt 14 is coupled to the pipe 9 through a slit 13 formed in a terminal portion of the pipe 9 folded flat, and the belt 9 Ten terminals are coupled to the control belt 14 through the slit 13.
[0022]
The pipe 9 is sealed and closed at a seal portion 11 at a position from the slit 13 or from the center of the collar, and the belt 10 is loosely fitted with a slight gap 12 through the seal portion 11.
[0023]
As the pulling member, instead of the belt 10, a string-like object such as a fiber braid or rope can be used. Even in this case, the same structure as that shown in FIGS.
[0024]
Thus, in this state, the pressure fluid heated to a temperature sufficient to give the thermoplastic synthetic resin constituting the pipe 9 a degree of flexibility that allows reversal is fed into the pressure vessel 2, Fluid pressure is applied to the inside of the inversion portion 5 and the belt 10 protruding from the inversion portion 5 is pulled through the pipe line 1 while allowing the heated pressurized fluid to flow from the gap 12 at the free end of the pipe 9. To do.
[0025]
[Action]
In the present invention, the heated and pressurized fluid fed into the pressure vessel 2 flows into the already-inverted portion 9b of the pipe 9, and fluid pressure is applied to the non-inverted portion 9a from the outside so that the non-inverted portion 9a The traction member 10 inserted therein is pressed against. Accordingly, by pulling the pulling member 10, a tension acts on the non-reversed portion 9 a that is pressed against the pulling member 10, thereby urging reversal at the reversing portion 5.
[0026]
At the same time, a part of the heated and pressurized fluid flows from the gap 12 into the non-inverted portion 9a. Since the traction member 10 is inserted into the non-inverted portion 9a, a slight space 9c is formed between the non-inverted portion 9a and the traction member 10, and along the traction member 10 through the space 9c. Heated pressurized fluid can flow.
[0027]
When the pulling member is a fiber rope or belt, since there are many gaps inside, the heated and pressurized fluid flows through the gaps. Moreover, by using a cylindrical woven fabric as the pulling member, the internal gap becomes larger, and more heated and pressurized fluid can flow.
[0028]
Further, by using a traction member having a different shape or fiber density, the size of the gap between the non-reversed portion 9a and the traction member 10 or inside the traction member 10 is adjusted, and the inside of the non-reversed portion 9a is adjusted. The amount of heated and pressurized fluid flowing can be increased or decreased.
[0029]
Therefore, the heat of the heated and pressurized fluid flowing along the belt 10 heats the non-inverted portion 9a from the inside to compensate for the temperature drop of the outside heated and pressurized fluid, and reverses by the heated and pressurized fluid ejected from the reversed portion 5 A heating atmosphere is formed at the tip of the portion 5, and the temperature can be reversed smoothly by preventing a temperature drop of the reversed portion 5.
[0030]
Further, since the heated and pressurized fluid flowing in the non-inverted portion 9a is not ejected from the inverted portion 5 and stays in the non-inverted portion 9a, new heated and pressurized fluid always flows in the non-inverted portion 9a. The inversion part 5 can be continuously heated by contacting the inversion part 5.
[0031]
【The invention's effect】
Therefore, according to the present invention, even in the case of a pipe 9 that is difficult to apply the reversal method such as polyethylene, the reversal method can be applied by imparting flexibility to the pipe 9 by the heat of the heated and pressurized fluid. .
[0032]
In addition, since a part of the heated heated pressurized fluid flows into the non-inverted portion 9a of the pipe 9 and flows along the pulling member 10, the temperature of the non-inverted portion 9a is prevented from being lowered to ensure flexibility. And inversion can proceed smoothly.
[0033]
Even when the reversal is temporarily stopped, the heated and pressurized fluid that has passed through the non-reversed portion 9a blows out from the reversing portion 5 and forms a heating atmosphere ahead of the reversing portion 5, so that the reversing portion 5 The reversal can proceed again without lowering the temperature and losing flexibility.
[0034]
The present invention is not limited to the construction method using the pipe 9 made of synthetic resin such as polyethylene, and can be applied as it is to the reversal construction method using the flexible lining material 4 generally used in the related art. The change in flexibility can be prevented and the reversal can proceed smoothly.
[Brief description of the drawings]
FIG. 1 is a central longitudinal sectional view showing a state in which a pipe is inverted according to the present invention. FIG. 2 is a plan view of a state in which a belt is inserted into a flatly folded pipe according to the present invention. Figure [Figure 4] Central longitudinal cross-sectional view showing the state of lining in the pipe line by the reversal method [Explanation of symbols]
1 Pipeline 5 Inverted part 9 Pipe 10 Belt

Claims (6)

A pulling member (10) is inserted into a flexible tube, and the tube is inverted so that the inner side becomes the outer side by a fluid pressure by a heated pressurized fluid to form an inverted portion (5). Allowing inflow of the heated and pressurized fluid for the reversal from the end along the pulling member (10), and ejecting the heated and pressurized fluid from the reversed portion (5) and protruding from the reversed portion (5) The pulled traction member (10) is pulled through the pipe (1), and the inverted part (5) is advanced in the pipe (1) to arrange the inverted pipe in the pipe (1). A method of forming a pipe in a pipeline 2. The pipe according to claim 1, wherein the pipe is a pipe (9) having the rigidity of a thermoplastic synthetic resin, and is flexible by being heated. 3. How to form The method for forming a pipe in a pipe line according to claim 1, characterized in that the pulling member (10) is a string-like or strip-like long object. 4. The method for forming a pipe in a pipe line according to claim 3, wherein the string-like long object is a fiber braid or rope. 4. The method for forming a pipe in a pipe line according to claim 3, wherein the belt-like long object is a fiber belt. 6. The method for forming a pipe in a pipe line according to claim 5, wherein the fiber belt is formed by flatly folding a tubular woven fabric.

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