JP2000346280A - Pipe lining cylindrical body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability of a lining work for the internal circumferential face of an existing pipe by inserting a thermoplastic resin lining cylinder body for lining, folding, in the existing pipe, and providing plural bent parts bending inward the cylinder body in the circumferential direction, then feeding steam therein, and enlarging and deforming the diameter under the heated and pressurized state. SOLUTION: Where the internal circumferential face of an existing city gas pipe A buried under the ground is lined with a lining cylinder body B for repairing or preventing gas leakage therefrom, the pipe lining cylinder body B before enlarged and deformed in its diameter is set in such a state as folded diametrically beforehand with bent parts 1 bending inward the cylinder body along the longitudinal direction of the cylinder formed in two positions opposed to each other in the cylinder circumferential direction. After inserting the folded and deformed cylinder body B in the pipe A, steam of approximately 130 deg.C is fed inside the cylindrical body B to enlarge and deform the diameter of the cylindrical body B under the heated and pressurized state. The lining work for installing the cylinder body B along the internal circumferential face of the pipe A is completed by cooling it under the pressurized state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin made of a thermoplastic resin which is folded and deformed in a radial direction, inserted into an existing pipe, expanded and deformed in a heated and pressurized state, and lining the inner peripheral surface of the existing pipe. The present invention relates to a pipe lining cylinder.

[0002]

2. Description of the Related Art The above-mentioned lining cylinder is reduced in diameter by folding and deforming in the radial direction to facilitate insertion into an existing pipe. Conventionally, as shown in FIG. A bent portion 1 that is bent toward the inside of the cylinder along the cylinder is formed at one location in the cylinder circumferential direction, and is folded and deformed in the radial direction.

[0003]

For this reason, the smaller the diameter is, the easier the insertion into the existing pipe A becomes.
Has a drawback that even when the diameter is expanded and deformed in a heated and pressurized state, the folding mark becomes wrinkled and tends to remain.
As shown in FIG. 7, of the lining cylinder B before diametrically deformed inserted into the existing pipe A provided with the bent pipe section b, the lining cylinder inserted along the bent pipe section b The portion B2 is bent along the bent pipe portion b in a state where the portion B2 is pressed against the inner peripheral surface 9 on the side where the radius of curvature of the bent pipe portion b is small, so that the depth direction of the bent portion 1 is When pressed along the inner peripheral surface 9 of the press-contact portion, the bent portion 1 is difficult to expand, and there is a drawback that the fold mark becomes wrinkled and tends to remain. The present invention has been made in view of the above circumstances,
When the diameter is expanded and deformed, the fold marks become wrinkles and hardly remain, and even when inserted into an existing pipe provided with a bent pipe section, the fold marks of the lining tubular body inserted along the bent pipe section are not The purpose is to make it hard to remain as wrinkles.

[0004]

According to a first feature of the present invention, the inner pipe of the existing pipe is folded and deformed in the radial direction, inserted into an existing pipe, and expanded and deformed in a heated and pressurized state. A tubular lining tube made of a thermoplastic resin lining the surface, the bent portion bent toward the inside of the tube along the tube longitudinal direction is formed at a plurality of locations in the tube circumferential direction, radially The point is that it is folded and deformed. [Operation] Since the bent portions are formed at a plurality of locations in the circumferential direction of the cylinder and are folded and deformed in the radial direction, the diameter can be reduced while reducing the bending depth at each bent portion. [Effect] Accordingly, since the bending depth at each bending portion is shallow, the fold mark becomes wrinkled when the diameter is expanded and deformed, and it is difficult to remain, and even when the bending tube is inserted into an existing pipe provided with a bending pipe portion, it is bent. Since the bent portion of the lining cylinder portion inserted along the pipe portion is easily expanded, the folding trace becomes wrinkled and hardly remains.

[0005]

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. [First Embodiment] FIG. 1 shows an example of an existing pipe. In order to repair or prevent a gas leak from an existing city gas pipe A buried underground, the inner peripheral surface thereof is used for pipe lining. 1 shows a lining structure of a pipe A for city gas lined with a cylindrical body B. The pipe A is provided with a straight pipe section a and a bent pipe section b. The in-pipe lining cylinder B is extruded with a medium-density polyethylene resin as an example of a thermoplastic resin.

FIG. 2 shows the cross-sectional shape of the tube B for lining in a pipe before the tube is expanded and deformed. The bent portions 1 bent toward the inside of the tube along the longitudinal direction of the tube oppose each other in the circumferential direction of the tube. Is formed in two places, and is previously radially folded and deformed. The folded and deformed in-pipe lining cylinder B is inserted into the pipe A and expanded and deformed in a heated and pressurized state. The inner peripheral surface is lined.

The pipe lining method of inserting the folded and deformed pipe lining pipe B into the pipe A over a predetermined lining section and lining the inner peripheral surface thereof will be described with reference to FIGS. 3 and 4. I will explain while. Fig. 3 (a)
As shown in the figure, pits D1, D
And a reel 4 wound around a tube B for lining the pipe which has been excavated and folded and deformed, and the cylinder B for lining the tube.
A work vehicle 7 having a boiler 6 for supplying steam through a steam supply pipe 5 inside thereof is kept near one pit D1, and a work vehicle 3 provided with a winch 2 is kept near another pit D2. Then, the pipe A exposed in each of the pits D1 and D2 is cut, and the towing wire W is inserted using a wire passing tool or the like, and one end of the towing wire W is connected to the winding drum of the winch 2. At the same time, the other end is connected to the front end of the in-pipe lining cylinder B wound on the reel 4.

The in-pipe lining cylinder B is wound around a reel 4 so as to be unwound freely on a reel-out end, and its winding-side base is connected to a steam supply pipe 5. Then, the towing wire W is wound by the drive of the winch 2 while heating the in-pipe lining cylinder B with steam supplied through the steam supply pipe 5.
The in-pipe lining cylinder B is drawn into the pipe A, and is inserted through the entire length of the pipe A in the lining section as shown in FIG.

Next, steam having a temperature of about 130 ° C. is supplied through the steam supply pipe 5 to the inside of the in-tube lining cylinder B, and heated and pressurized to a pressure of about 1.7 kgf / cm ² , As shown in FIG. 4, when the in-pipe lining cylinder B is expanded and deformed and then cooled in a pressurized state, the lining cylinder B1 inserted into the straight pipe a is also inserted along the bent pipe b. The lining tube portion B2 is also shown in FIG.
As shown in (2), it can be mounted along the inner peripheral surface of the pipe in a state where the folding mark is wrinkled and hardly remains.

[Second Embodiment] FIG. 5 shows another embodiment of an in-tube lining cylinder B before diameter expansion deformation, in which a bent portion 1 bent toward the inside of the cylinder along the longitudinal direction of the cylinder is shown. It is formed at four places in the circumferential direction of the cylinder, and is previously folded and deformed in the radial direction. Other configurations are the same as those of the first embodiment.

[Other Embodiments] The pipe-lining tubing according to the present invention may be formed such that the bent portion is formed at three or more than five locations in the circumferential direction of the tube and is folded and deformed in the radial direction. 2. The pipe lining cylinder according to the present invention may be formed of a thermoplastic resin such as a polyolefin resin other than the polyethylene resin. 3. The in-pipe lining cylinder according to the present invention may be one that is expanded and deformed by a heated liquid such as hot water press-fitted inside the pipe. 4. The in-pipe lining cylinder according to the present invention may be one in which the lining is adhered to the inner peripheral surface of an existing pipe. 5. The in-pipe lining cylinder according to the present invention may be one that lines the inner peripheral surface of an existing liquid pipe such as a water pipe or a sewer pipe other than a gas pipe.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a lining structure.

FIG. 2 is a cross-sectional view of a tube for lining in a pipe before expanding deformation.

FIG. 3 is an explanatory view of a pipe lining method.

FIG. 4 is an explanatory view of a pipe lining method.

FIG. 5 is a cross-sectional view of a tube body for lining in a pipe before diameter expansion deformation showing a second embodiment.

FIG. 6 is a cross-sectional view of a tube body for lining in a pipe before diameter expansion deformation showing a conventional example.

FIG. 7 is a side view showing a state in which the conventional pipe for lining pipe is inserted into the pipe.

[Explanation of symbols]

 1 Bent part A Existing pipe

Claims (1)

[Claims] 1. A tube for lining inside a pipe made of thermoplastic resin, which is folded and deformed in the radial direction, inserted into an existing pipe, expanded and deformed in a heated and pressurized state, and lining the inner peripheral surface of the existing pipe. A tubular lining tubular body in which bent portions bent toward the inside of the tubular body along the longitudinal direction of the tube are formed at a plurality of locations in the circumferential direction of the tube, and are radially folded and deformed.