JP2001132889A - Method of repairing in-pipe lining cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To repair a repaired part of an in-pipe lining cylinder in a state of hardly interrupting the traffic. SOLUTION: In this method of repairing an in-pipe lining cylinder C mounted in a non-bonded state inside a buried pipe A being inserted in the buried pipe A and deformed with a hot pressurized fluid so as to be enlarged in diameter and then cooled in the diameter-enlarged deformed state, pits F1, F2 are excavated on both sides of a repaired part E of the in-pipe lining cylinder C in the longitudinal direction of the buried pipe A, and the buried pipe A exposed in each pit is partially or entirely removed. After the in-pipe lining cylinder C exposed in each pit is radially cut, the in-pipe lining cylinder C between both pits is towed and pulled out of the buried pipe A. A new in-pipe lining cylinder is inserted through inside the buried pipe A after pulling out the in-pipe lining cylinder, and deformed in the diameter enlarged state with a hot pressurized fluid fed into the folded pipe and then cooled in the diameter-enlarged deformed state to newly mount the in-pipe lining cylinder inside the buried pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for expanding a lining pipe made of a thermoplastic resin, which is inserted into a buried pipe, by applying a heated and pressurized fluid supplied to the pipe. The present invention relates to a method for repairing an in-pipe lining tube which is cooled in a state and is mounted in a non-adhered state inside the buried pipe.

[0002]

2. Description of the Related Art The above-mentioned in-pipe lining cylinder is, for example, a case in which a defect or the like which cannot secure a desired strength and sealing property is formed due to the presence of a scratch or a pinhole in the in-pipe lining cylinder. If a part of the tube is cooled without expanding the diameter, the flow path cross-sectional area of the fluid in the pipe cannot be secured, or if there is a defective part that increases the flow resistance, etc., the defective part of the pipe lining cylinder is repaired. There is a need to. For this reason, in the conventional method of repairing a lining pipe in a pipe, a buried pipe corresponding to the repair point is dug out over the entire length, and the lining pipe in the pipe at the repair point is cut off together with the buried pipe.
A new tube is newly connected to the cut portion and backfilled.

[0003]

According to the above-mentioned conventional repair method, the buried pipe corresponding to the repaired portion is dug out over the entire length, so that the buried pipe buried under the road impedes traffic. There is an easy disadvantage. The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to repair a repaired portion of an in-line lining tube in a state where it is unlikely to hinder traffic.

[0004]

According to a first feature of the present invention, a lining tube made of a thermoplastic resin inserted into a buried tube is expanded by a heated and pressurized fluid supplied into the tube. After being deformed, it is cooled in its expanded and deformed state, and is a method of repairing an in-pipe lining tube that is mounted in a non-adhered state inside the buried pipe. Excavating pits on both sides sandwiching it, exposing the buried pipe in each pit, removing a part or all of the exposed buried pipe, exposing the in-pipe lining cylinder in each pit, After cutting the pipe lining pipe exposed in the pit in the radial direction, the pipe lining pipe between the two pits was towed, the pipe lining pipe was pulled out from the inside of the buried pipe, and the pipe lining pipe was drawn. Later filling After the pipe lining pipe is newly inserted into the pipe, the pipe is expanded and deformed by the heating and pressurized fluid supplied to the pipe, and then cooled in the expanded and deformed state, and the pipe lining is inserted inside the buried pipe. The point is to attach a new tube. [Action] Excavation of pits on both sides sandwiching the repair point of the in-pipe lining tube from the longitudinal direction of the pipe, removing part or all of the buried pipe exposed in each pit, and exposing the lining in each pit After cutting the pipe in the radial direction, pull the pipe lining pipe between both pits, pull out the pipe lining pipe including the repair point from the inside of the buried pipe, and newly insert it in the buried pipe after pulling out the pipe lining pipe. After the inserted pipe lining tube is expanded and deformed by the heating and pressurizing fluid, it is cooled in the expanded and deformed state, and the pipe lining tube is newly installed inside the buried pipe. [Effect] Since it is possible to use a pit excavated at a place where traffic is not likely to be hindered such as an intersection on both sides sandwiching the repair point of the in-pipe lining pipe from the pipe longitudinal direction, traffic can be hindered. It is possible to repair the repaired part of the lining tube in the pipe in a state in which it is difficult for the lining to be repaired.

[0005] A characteristic feature of the invention according to claim 2 is that, after cutting the pipe lining pipe exposed in each of the pits in the radial direction, the pipe lining pipe between the two pits is sealed, and the sealed pipe is closed. The heating fluid supplied into the lining tube softens the tube lining tube, pulls the softened tube lining tube, and pulls out the tube lining tube from the inside of the buried tube. [Action] The heating fluid supplied into the sealed pipe lining pipe between the two pits softens the pipe lining pipe, so that the pipe lining pipe is given flexibility and the pipe lining pipe is easily deformed in the diameter reducing direction. The inner lining tube which is easily deformed in the diameter reducing direction is pulled and pulled out from the inside of the buried pipe. [Effect] Since the in-tube lining tube is easily deformed in the diameter reducing direction, it is easy to pull out even the in-line lining tube mounted inside the buried tube having the bent tube portion, and the drawn-out in-line lining tube is outside the pit. Easy to carry out.

According to a third aspect of the present invention, the in-pipe lining pipe exposed in each of the pits is cut in a radial direction, and then a lining pipe cutting tool is mounted in the in-pipe lining pipe between the pits. By moving the lining tube cutting tool along the longitudinal direction of the tube, the in-tube lining tube is cut into a plurality of strip-shaped cut pieces in the circumferential direction, and each of the cut pieces is pulled, thereby forming the in-tube lining tube. The point is that it is pulled out from the inside of the buried pipe. [Function] The lining pipe cutting tool mounted in the pipe lining pipe between the two pits is moved along the pipe longitudinal direction, and the pipe lining pipe is formed into a plurality of strips in the circumferential direction, which have a small shape rigidity and are easily bent and deformed. Each of the cut pieces, which is easily deformed by bending, is pulled and pulled out from the inside of the buried pipe. [Effect] Since each cut piece which is easily deformed is pulled out and pulled out from the inside of the buried pipe, it is easy to pull out even the lining pipe in the pipe mounted inside the buried pipe provided with the bent pipe portion, and each cut that is drawn out Pieces are easy to carry out of the pit.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 is a diagram showing a polyethylene resin (thermoplastic resin) that is folded and deformed in a radial direction into a cast iron city gas supply pipe (hereinafter referred to as a buried pipe) A buried underground under a road. An example) is inserted through a pipe lining tube (hereinafter referred to as a folding tube) B, and expanded and deformed by high-temperature and high-pressure steam (an example of a heated and pressurized fluid) supplied into the folding tube B, and then expanded. The in-pipe lining tube C cooled in a radially deformed state and mounted in a non-adhered state inside the buried pipe A is shown. The buried pipe A is provided with a straight pipe section A1 and a bent pipe section A2. As a result of cooling the folded pipe B inserted through the bent pipe section A2 without being able to expand the diameter of the folded pipe section A, the inner lining of the bent pipe section A2 is obtained. A defective portion where the cross-sectional area of the flow path of the gas in the pipe cannot be secured is formed in the cylinder C.

Hereinafter, the in-tube lining tube C of the bent tube portion A2 will be described.
A method for repairing an in-pipe lining tube according to the present invention for repairing a defective portion formed as a repair portion E will be described with reference to FIGS. As shown in FIG. 2 (a), pits F1 and F2 are excavated on both sides sandwiching the repaired portion E of the in-lined lining tube C from the longitudinal direction of the tube and hardly hindering traffic. The buried pipe A is exposed in F2, a part of the exposed buried pipe A is cut into a tubular shape over a predetermined length, crushed and removed, and the lining pipe C in the pipe is exposed in each of the pits F1 and F2. Let it. Then, the exposed in-pipe lining tube C is cut into a tubular shape in a radial direction at a position away from each cutting end of the buried pipe A and removed.

Next, as shown in FIG. 2B, a reel 1 on which a folding tube B folded and deformed into a heart shape in the radial direction is wound, and a steam supply pipe 2 is inserted inside the folding tube B through a steam supply pipe 2. The boiler 3 for supplying (an example of the heating and pressurized fluid) is made to stand by near one pit F1 and the winch 4 is made to stand by near the other pit F2. Then, a lining tube in a pipe between the pits F1 and F2 (hereinafter, referred to as a lining tube)
Rubber closing members 5a and 5b are attached to both ends of the lining tube D (C) to seal the inside of the lining tube D to be removed, and one of the steam supply pipes 6 connected to the boiler 3 is closed. The lining tube D to be removed is communicated with the lining tube D to be removed through the member 5a, and the lining tube D to be removed is softened by the steam supplied from the steam supply pipe 6.
Provide sufficient flexibility.

Next, as shown in FIG. 2 (c), the closing members 5a and 5b at both ends are removed, and the towing wire W of the winch 4 is connected to the end of the lining tube D to be removed on the pit F2 side. Then, the softened removal target lining tube D is pulled by the drive of the winch 4 and pulled out from the inside of the buried pipe A. When the towing length of the winch 4 is insufficient, the connecting position of the towing wire W to the removal target lining tube D is sequentially changed to the upper side in the drawing direction, and the removal target lining tube D is buried along the entire length. It can be pulled out from the inside of A.

Next, as shown in FIG. 3 (d), the towing wire W of the winch 4 is inserted into the buried pipe A from which the lining tube D to be removed is pulled out by using a wire tool or the like. The tow wire W is connected to the end of the folded tube B wound on the reel 1. The folding tube B is wound around a reel 1 so as to be able to be unwound and wound on a reel 1 with its unwinding side end sealed, and the winding side base is communicated with the steam supply tube 2. Then, while the folding tube B is heated and softened by steam supplied through the steam supply tube 2, the winch 4 is heated.
Then, as shown in FIG. 3 (e), the folded pipe B is newly inserted through the entire length of the buried pipe A between the pits F1 and F2.

Next, the pit F1 side of the folded tube B is cut, and the cut end is heated and softened by a burner or the like to expand and deform, and as shown in FIG.
The steam supply pipe 6 connected to the boiler 3 was connected to the inside of the folded pipe B through the closing member 5a, and the high-temperature and high-pressure steam supplied from the steam supply pipe 6 expanded and deformed the folded pipe B. Thereafter, the pipe is naturally cooled in the expanded and deformed state, and as shown in FIG. 4, an in-pipe lining pipe C is newly mounted in a non-adhered state inside the buried pipe A between the pits F1 and F2.

[Second Embodiment] Another embodiment of the method of repairing an in-pipe lining tube according to the present invention will be described with reference to FIGS. The steps until the removal target lining tube D is softened and the process of newly installing the in-line lining tube C inside the buried pipe A after the removal target lining tube D is drawn are the same as those in the first embodiment. Therefore, the process of extracting the softened removal target lining tube D from the buried pipe A will be described.

After the lining tube D to be removed is softened as shown in the first embodiment, the closing members 5a, 5 at both ends are removed.
5B, the towing wire W of the winch 4 is inserted into the lining tube D to be removed using a wire passing tool or the like, and the lining tube connected to the towing wire W as shown in FIG. The cutting tool G is mounted in the lining tube D to be removed.

The lining tube cutting tool G is shown in FIG.
As shown in (b), three spring plates 9 are fixed at equal intervals in the circumferential direction to a pulling member 7 provided with a connecting portion 8 of the pulling wire W, and a circle is formed on the tip side of each spring plate 9. The plate blade 10 is rotatably supported so as to protrude outward from the inner diameter of the buried pipe A, and each spring plate 9 is moved so that the disk blade 10 enters the inside of the lining tube D to be removed. The disk blade 10 is elastically deformed inward so as to bite into the lining tube D to be removed by the elastic restoring force of the spring plate 9. Then, as shown in FIG. 5 (b), the lining tube cutting tool G is pulled and moved along the pipe longitudinal direction by driving the winch 4, and the lining tube D to be removed is cut into three strips in the circumferential direction. Piece H
Cut into pieces.

Next, the towing wire W removed from the lining tube cutting tool G is connected to the end of the cutting piece H, and as shown in FIG. Pull and pull out from the inside of the buried pipe A. Also in the present embodiment, when the towing length by the winch 4 is insufficient, the connecting position of the towing wire W to each of the cut pieces H is sequentially changed to the upper side in the drawing direction, and each of the cut pieces H is embedded over the entire length. Tube A
Can be pulled out from inside. After that, as shown in the first embodiment, the in-pipe lining pipe C is newly mounted inside the buried pipe A after the lining pipe D to be removed is pulled out.

[Other Embodiments] The method for repairing an in-pipe lining tube according to the present invention may be used to repair an in-pipe lining tube made of a thermoplastic resin, which is mounted inside a buried pipe having only a straight pipe portion. 2. In the method of repairing a pipe lining tube according to the present invention, when it is necessary to replace the pipe lining tube for some reason, the replacement portion may be used as a repair portion. 3. The method for repairing an in-pipe lining tube according to the present invention may be used to repair an in-pipe lining tube made of a thermoplastic resin other than a polyethylene resin, such as a vinyl chloride resin. 4. In the method of repairing an in-pipe lining tube according to the present invention, a small-diameter in-pipe lining tube that is not folded and deformed in the radial direction is inserted into a buried pipe, and is expanded and deformed by heating and pressurized fluid supplied into the tube. Thereafter, the pipe may be cooled in the expanded deformed state and used for repairing the in-pipe lining pipe which is mounted in an unbonded state inside the buried pipe. 5. The method of repairing an in-pipe lining tube according to the present invention can be used for repairing a thermoplastic lining in-pipe made of a thermoplastic resin mounted inside a liquid buried pipe such as a water pipe or a sewer pipe other than a gas pipe. good. 6. In the method for repairing an in-pipe lining tube according to claim 3 of the present invention, the in-pipe lining tube may be cut into a plurality of strip-shaped cut pieces in a circumferential direction without heating and softening, and two or more pieces may be cut in a circumferential direction. It may be cut into four or more strips.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of an in-pipe lining pipe installed inside a buried pipe.

FIG. 2 is an explanatory diagram of a method of repairing a lining tube in a pipe.

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

FIG. 4 is a longitudinal sectional view of a main part of an in-tube lining tube mounted inside a buried tube.

FIG. 5 is an explanatory diagram of a method of repairing a lining tube in a pipe according to a second embodiment.

FIG. 6A is a side view of the lining tube cutting tool, and FIG. 6B is a front view of the lining tube cutting tool.

[Explanation of symbols]

 A Buried pipe C In-pipe lining pipe E Repaired area F1 pit F2 pit G Lining pipe cutting tool H Cutting piece

Claims (3)

[Claims] A lining tube made of a thermoplastic resin inserted into a buried tube is expanded and deformed by a heated and pressurized fluid supplied into the tube, and then cooled in the expanded and deformed state.
A method of repairing an in-pipe lining tube mounted in a non-adhered state inside the buried pipe, wherein pits are excavated on both sides sandwiching a repair point of the in-pipe lining pipe from a pipe longitudinal direction, and the burial is performed in each pit. The pipe was exposed, a part or all of the exposed buried pipe was removed, the pipe lining pipe was exposed in each pit, and the pipe lining pipe exposed in each pit was cut in the radial direction. Thereafter, the in-pipe lining tube between the two pits is pulled, the in-pipe lining tube is pulled out from the inside of the buried pipe, and the in-pipe lining pipe is newly inserted into the buried pipe after the in-pipe lining pipe is pulled out. The pipe lining which is expanded by the heated and pressurized fluid supplied into the pipe, is cooled in the expanded and deformed state, and the pipe lining pipe is newly mounted inside the buried pipe. Repairing method 2. The pipe lining pipe exposed in each of the pits is cut in the radial direction, and then the pipe lining pipe between the two pits is sealed, and the heating fluid supplied into the sealed pipe lining pipe is used. 2. The pipe lining pipe is softened, the softened pipe lining pipe is pulled, and the pipe lining pipe is pulled out from the inside of the buried pipe.
Repair method for the in-pipe lining tube described. 3. The pipe lining tube exposed in each of the pits is radially cut, and then a lining tube cutting tool is mounted in the pipe lining tube between the two pits. Moving along the direction, cutting the in-pipe lining tube into a plurality of strip-shaped cut pieces in the circumferential direction, pulling each of the cut pieces, and pulling out the in-pipe lining pipe from the inside of the buried pipe. The method for repairing a lining tube in a pipe according to item 1.