JP2788042B2 - Pipe line lining method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for attaching a lining material to an inner surface of a pipeline, and particularly to a method for repairing a pipeline mainly buried underground. Or it relates to a method of lining its inner surface for the purpose of reinforcement.

2. Description of the Related Art Conventionally, as a method of lining a pipeline, a reaction-curable resin liquid is applied to the inner surface of a flexible tubular lining material, and this is turned over by fluid pressure and inserted into the pipeline, and the inside of the pipe is turned over. A method is known in which a lining material is pressure-bonded to the inner surface of a pipe via the reaction-curable resin liquid, and the reaction-curable resin liquid is cured to bond the lining material to the pipe.

Thus, in this method, it is preferable that after the lining material is inserted into the conduit, the lining material is heated to accelerate the curing of the reaction-curable resin liquid. As a lining method for that purpose,
The method of JP 59-37213 A is known.

In this method, as shown in FIG. 3, the lining material 2 accommodated in the pressure vessel 1 is inserted from one end to the other end of the pipe 3 while being turned upside down by fluid pressure, and protruded from the other end of the pipe. At the end 4 of the lining material 2 pierced, a piercing tool 7 provided with a valve 6 on a pipe 5 is pierced, and a heating pressure fluid is fed from the pressure vessel 1 and the pressure fluid in the lining material 2 is pierced. Pipe 5
And the inside of the lining material 2 is replaced with a heating pressure fluid,
The effect of the reaction-curable resin liquid is promoted by the heat of the heating pressure fluid.

However, this method has various problems because the pressurized fluid in the lining material 2 is discharged at the end 4 of the lining material 2. As one of them, as shown in FIG.
When lining the branch pipe 9 branching from the inner pipe 2, the lining material 2 is inserted from the end of the branch pipe 9, and the terminal end 4 projects into the main pipe 8, so that the piercing tool is inserted into the terminal end 4. 7
Can not pierce. Therefore, the pressure fluid in the lining material 2 cannot be replaced with the heating pressure fluid, and the curing of the reaction-curable resin liquid cannot be promoted by heating.

In addition, as shown in FIG. 5, the pipe 3 may have a curved portion due to ground vibration or the like, or may have a bend such as a prone to lay it avoiding another pipe. . When the above method is adopted when lining the pipe 3 having such a bent portion 10, the moisture in the heating pressure fluid condenses in the lining material 2 and this drains.
It becomes 11 and stays at the lowest part of the bent portion 10 and cannot be discharged. In particular, when pressurized steam is used as the heating pressure fluid, the pressurized steam is condensed, a large amount of drain 11 is retained, and the reaction-curable resin liquid in that portion may not be sufficiently heated, and the curing may be delayed. is there.

The present invention has been made in view of such circumstances, and it is possible to reliably line a branch pipe branched from the main pipe or a pipe having a bent portion regardless of the laying state of the pipe. It is intended to provide a method.

Means for Solving the Problems Accordingly, the present invention provides a method for inserting a flexible tubular lining material into a pipeline, feeding a pressure fluid into the lining material, and causing the lining material to react with a reaction-curable resin liquid. And pressurizing the fluid inside the lining material with pressurized steam to heat and cure the reaction-curable resin liquid, wherein a flexible hard tube is provided inside the lining material. It inserts and positions the tip of the hard tube at a low place in the lining material and makes the rear end communicate with the outside air, and discharges the drain retained in the low place through the hard tube by the pressure of pressurized steam. It is assumed that.

Also, as a method of applying the present invention to a branch pipe lining,
Insert a lining material whose end is closed from the end into a branch pipe branched from the main pipe, make the tip of the lining material protrude into the main pipe, feed a pressure fluid into the lining material, and react the reaction-curable resin liquid. Through the pipe wall of the portion outside the branch pipe at the rear of the lining material, and insert a flexible hard tube with its tip positioned at the tip of the lining material. At least, a heating pressure fluid is supplied from the rear of the lining material, the pressure fluid in the lining material is discharged from the hard tube and replaced with the heating pressure fluid, and the heat of the heating pressure fluid causes the reaction-curable resin to flow. This can be performed by heating and curing the liquid.

In addition, as a method of applying to a pipeline having a bent portion such as a protruding portion, a flexible tubular lining material is inserted into the pipeline having a bent portion, and a pressure fluid is fed into the lining material to react. Pressed against the inner surface of the conduit via the curable resin liquid,
A flexible hard tube is inserted through the pipe wall of a portion of the lining material outside the pipeline, the tip of the tubing is positioned at the lowest part of the bent portion, and the heated pressure fluid is supplied from one end of the lining material. The pressure fluid is discharged from the other end of the lining material and replaced with the heating pressure fluid, and the reaction-curable resin liquid is heated and cured by the heat of the heating pressure fluid,
It can be performed by discharging the liquid retained in the bent portion through the hard tube.

The rigid tube used in the present invention has sufficient rigidity to maintain a circular cross section without being flattened by the fluid pressure in the lining material, and has a bent portion of the lining material introduction portion or pipe. It is necessary that the tube be flexible enough to be able to change the direction following the bending of the lining material or the pipe in the part or the like. As such a tube, a relatively thick tube made of plastic such as high-density polyethylene, polypropylene, or nylon 12, or a metal flexible tube can be used. The outer diameter of this tube is suitably about 5 to 20% of the inner diameter of the applicable pipe.

A method of positioning the tip of the hard tube 12 at a low position in the conduit 3 is to attach a temperature sensor to the tip of the hard tube 12,
By measuring the temperature around the distal end of the tube, the low-temperature portion in the conduit 3 can be accurately detected, and the distal end of the low-hard tube 12 where the drain has accumulated can be positioned.

According to the present invention, since the rigid tube has flexibility, the distal end of the hard tube is bent at a low point in the lining material while being bent corresponding to the introduction portion of the lining material into the pipeline or the bending of the pipeline. Position. Further, in this state, pressurized steam is fed into the lining material, so that a fluid such as the pressure fluid or the drain 11 in the lining material is discharged out of the lining material through the hard tube due to the pressure of the pressurized steam.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which the present invention is applied to the lining of a branch pipe 9. The lining material 2 is turned upside down by the fluid pressure in the pressure vessel 1 and inserted into the branch pipe 9, and is pressed against the inner surface of the branch pipe 9 by the fluid pressure. The inside end 4 of the lining 2 protrudes into the main pipe 8 from the branch portion of the branch pipe 9.

Reference numeral 12 denotes a flexible hard tube which is inserted through the wall of the lining material 2 outside the branch pipe 9 and has a front end located at the end 4 of the lining material 2 and a rear end in the atmosphere. Open to

In this state, a heated pressure fluid such as pressurized steam is fed from the pressure vessel 1. The pressure fluid filled in the lining material 2 by the pressure of the heating pressure fluid becomes a hard tube.
The pressure fluid in the lining material 2 is discharged to the outside through 12, and is replaced by the heating pressure fluid. The mold resin liquid is heated and cured.

FIG. 2 shows a state in which the present invention is applied to a pipeline 3 having a bent portion 10. Also in this example, the lining material 2 is turned upside down by the fluid pressure in the pressure vessel 1 and inserted from one end to the other end of the pipeline 3, and is pressed against the inner surface of the pipeline 3 by the fluid pressure. The inside end 4 of the lining 2 protrudes from the other end of the conduit 3, and a piercing tool 7 is attached to the protruding portion.

The rigid tube 12 is inserted through the pipe wall of the lining material 2 outside the conduit 3, and its tip is located at the lowest part of the bent portion 10 and its rear end is open to the atmosphere.

In this state, a heated pressure fluid such as pressurized steam is fed from the pressure vessel 1. The pressure fluid filled in the lining material 2 by the pressure of the heating pressure fluid is discharged from the piercing device 7 and the hard tube 12, and the pressure fluid in the lining material 2 is replaced by the heating pressure fluid. Is lining material 2
The reaction-curable resin liquid that fills the inside and is interposed between the lining material 2 and the conduit 3 is heated and cured.

The water contained in the heating pressure fluid condenses into a drain 11 and stays in the bent portion 10 of the lining material 2. The drain 11 is discharged to the outside through the hard tube 12 by the pressure of the heating pressure fluid. You. Therefore, the drain
11 does not result in insufficient heating.

Effect of the Invention According to the present invention, when the reaction-curable resin liquid is heated by the heating pressure fluid to promote curing, the fluid in the lining material inserted into the pipe is discharged through the hard tube 12, so that the lining material The reaction-curable resin liquid can be cured uniformly and reliably over the entire length of the pipeline without the fluid inside staying and obstructing the heat-curing.

According to the second aspect of the present invention, when lining the branch pipe branched from the main pipe, the pressure fluid at the end of the lining material is discharged through the hard tube. The pressure fluid is replaced with a heating pressure fluid, and the reaction-curable resin liquid can be efficiently heated to promote curing.

Further, in the invention of claim 3, even if water condensed in the heating pressure fluid stays in the bent portion, the water is discharged through the hard tube, so that a large amount of water does not stay for a long time, The reaction-curable resin liquid is not heated sufficiently and curing is not insufficient.

[Brief description of the drawings]

FIG. 1 and FIG. 2 are central longitudinal sectional views showing a state in which the present invention is applied to a pipeline having a branch pipe and a bent portion, respectively. FIG. 3 is a central longitudinal sectional view showing a state where the pipe is lined by a conventional method, and FIGS. 4 and 5 are liners for a pipe having a branch pipe and a bent portion by the conventional method. FIG. 4 is a central longitudinal sectional view showing a problem when performing the operation. 2 ... lining material, 3 ... pipeline 4 ... end, 8 ... main pipe 9 ... branch pipe, 10 ... bent section 11 ... water, 12 ... hard tube

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B29C 63/00-63/48 F16L 1/00 F16L 55/16-55/18

Claims (3)

(57) [Claims] 1. A flexible tubular lining material (2) is connected to a conduit (3).
And pressurized fluid is fed into the lining material (2) to bring the lining material (2) into pressure contact with the inner surface of the conduit (3) via a reaction-curable resin liquid, and the lining material (2) In the method of substituting the pressurized fluid therein with pressurized steam and heating and curing the reaction-curable resin liquid, a flexible hard tube (12) is inserted into the lining material (2), and the hard tube (12) is inserted. The front end of 12) is located at a low place in the lining material (2) and the rear end is communicated with the outside air, and the drain (11) staying at the low place is pressed by the pressure of pressurized steam through the hard tube (12). A method of lining a pipeline, characterized by discharging 2. A branch pipe (9) branched from the main pipe (8) is inserted with a liner (2) having a closed end from its end, and the tip of the liner (2) is inserted into the main pipe (8). And pressurized fluid is fed into the lining material (2) and pressed against the inner surface of the branch pipe (9) via the reaction-curable resin liquid, thereby forming a branch pipe (9) at the rear of the lining material (2). ) A flexible hard tube (12) is inserted through the outer wall of the tube and its tip is positioned at the tip of the lining material (2), and from the rear of the lining material (2). A heated and pressurized fluid is fed, and the pressure fluid in the lining material (2) is transferred to the hard tube (1).
2) A method for lining a branch pipe, wherein the reaction-curable resin liquid is heated and cured by the heat of the heated and pressurized fluid. 3. A reaction hardening type by inserting a flexible tubular lining material (2) into a conduit (3) having a bent portion (10) and feeding a pressure fluid into the lining material (2). The flexible tube (12) is pressed into contact with the inner surface of the pipe (3) through a resin liquid, and penetrates the pipe wall of the portion of the lining material (2) outside the pipe (3). Insert and insert the tip into the bent part (10)
The heating and pressurizing fluid is supplied from one end of the lining material (2), and the pressurized fluid is discharged from the other end of the lining material (2) and replaced with the heating and pressurizing fluid. A heat-pressurized fluid that heats and cures the reaction-curable resin liquid, and discharges the liquid remaining in the bend (10) via the hard tube (12). Lining method for pipelines