JP2986719B2 - Reversing lining tube used for existing pipe repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining tube used for an existing pipe repair method, and more particularly, to repairing an old pipe such as a gas pipe or a water pipe for the purpose of pipe maintenance for deterioration of the old pipe. To a reversing lining tube which is reversely introduced into the tube and is attached to the inner surface of the tube.

[0002]

2. Description of the Related Art As an inversion lining method in which a flexible inversion lining tube is introduced into an existing pipe while being inverted and attached to the inner surface of a pipeline, for example, the present applicant has disclosed in
A construction method described in Japanese Patent No. 229165 is proposed.

In the above-mentioned construction method proposed by the present applicant, as shown in FIG. 1, first, a leading pig 3 having an outer diameter slightly larger than the inner diameter of an existing pipeline 1 is inserted through an opening 1a of the existing pipeline 1. To be introduced. Next, the necessary amount of adhesive 5 to be applied to the inner surface of the pipeline
Is introduced into the pipeline so as to be located on the rear side of the leading pig 3. Then, one end of the reversing lining tube 6 is folded back to the outside so as to be adjacent to the adhesive 5 and is annularly fixed to the conduit opening 1a.

Next, a suction device P is mounted and connected to the other end opening 1b of the pipeline 1, and a negative pressure is generated in the pipeline 1 by operating the suction device P. Lead pig 3 by the negative pressure
The adhesive 5 moves to the other end opening side 1b of the pipeline, and the reversing lining tube 6 is attached to the inner surface of the pipeline by the adhesive while being turned over in the pipeline.

As a reversal lining method for an existing pipe, a pressure device (not shown) can be attached and connected to the opening 1a side of the pipeline 1 without using the suction device P shown in FIG. is there. In this case, a positive pressure is generated in the pipeline 1 by operating a pressure device (not shown).
Due to the positive pressure, the leading pig 3 and the adhesive 5 move to the other end opening side 1b of the pipeline, and the reversing lining tube 6 is attached to the inner surface of the pipeline by the adhesive 5 while being turned over in the pipeline. .

[0006]

By the way, the reversing lining tube 6 used in the above-mentioned method is composed of an elastomer layer (for example, a polyurethane layer) and a woven layer (one woven with horizontal yarns and vertical yarns). Or only the elastomer layer.

[0007] As shown in FIG. 2, when a material composed of the elastomer layer 10 and the fabric layer 11 is used as an inverted lining tube, the fabric layer 11 becomes an outer layer in the tube and is adhered to the inner surface of the tube while impregnating the adhesive 5. Therefore, a lining layer having a uniform thickness is formed. However, when such an inverted lining tube is inverted and inserted into the tube, the fabric layer 11 cannot reduce the thickness and hardness of the entire tube, so that the inverted insertion property in the tube is poor. Especially,
When the reversing lining tube is reversed and inserted through the bent portion 1c of the conduit 1, the inverted insertion property is further deteriorated.

On the other hand, as shown in FIG. 3, when a material having only the elastomer layer 10 is used as a reversing lining tube, the thickness and hardness of the tube have the above-mentioned two-layer structure (from the elastomer layer 10 and the fabric layer 11). Become
Since it is smaller, the reverse insertion property when the tube is reversely inserted over the entire length of the pipe including the bent portion 1c is good. However, as shown in FIG. 3, since the elastomer layer 10 does not impregnate the adhesive 5 at all, the adhesiveness at the time of adhering to the inner surface of the tube is deteriorated. Irregularities are likely to occur due to the layer.

The present invention has been devised in order to solve these problems. The present invention improves the penetrability into the existing pipe when it is brought into contact with the inner surface of the existing pipe while inverting the pipe, and has a uniform thickness. To provide an inverted lining tube suitable for forming a lining layer having the following.

[0010]

Means for Solving the Problems To achieve the above object, the reversing lining tube of the present invention has a two-layer structure of an elastomer layer and a flocked layer, and when the reversal introduction is performed into an existing pipe, the flocked layer is formed. It is characterized by being an outer layer and being adhered to the inner surface of the tube.

Further, the present invention is characterized in that the elastomer layer is a polyurethane layer, a polyester layer, a butyl rubber layer, a polyisobutylene layer, or a polyvinyl chloride layer.

Further, the present invention is characterized in that the flocking layer is a fiber layer in which an adhesive is applied to the surface of the elastomer layer and short fibers are adhered by an electrostatic effect.

Further, the present invention is characterized in that the short fibers of the flocking layer are aromatic polyamide, nylon, rayon, tetron, polyester, acryl, vinylon, or polypropylene.

Further, the present invention is characterized in that the elastomer layer has a thickness of 0.3 to 1.5 mm.

Further, the present invention is characterized in that the flocking layer has a thickness of 2 mm or less.

[0016]

The reversing lining tube of the present invention has a two-layer structure of an elastomer layer and a flocking layer. When the reversing lining tube is reversely introduced into an existing pipe, the flocking layer becomes an outer layer and is adhered to the inner surface of the pipe. Not only has the same adhesive impregnating effect as the woven fabric layer, but also by shortening the length of the flocking, the overall thickness of the tube can be reduced, and by reducing the density of the flocking, the overall hardness of the tube can be reduced. Can be reduced. Therefore, not only is the pipe penetration property improved when the tube is brought into contact with the inner surface of the tube while being inverted and introduced into the tube, but also because the flocked layer adheres to the inner surface of the tube while impregnating the adhesive, the existing thickness having a uniform thickness is improved. A lining layer of the tube is formed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 4, reference numeral 20 indicates an inverted lining tube according to the present invention. FIG. 4 (a) and FIG.
As shown in (b), the inverted lining tube 20 of the present invention has a two-layer structure of an elastomer layer 20a and a flocking layer 20b. The flocked layer 20b becomes an outer layer when it is inverted into the existing pipe, and is adhered to the inner surface of the pipe.

The elastomer layer 20a is made of polyurethane having a required tensile strength, but may be made of another elastomer having the same tensile strength, for example, polyester, butyl rubber, polyisobutylene, or polyvinyl chloride. It is also possible to form.

The elastomer layer 20a has a thickness of 0.3.
It has a thickness of ~ 1.5 mm. If the thickness is smaller than 0.5 mm, the required strength cannot be obtained. On the other hand, when the thickness exceeds 1.5 mm, the reverse insertion property when the lining tube 20 is reversely inserted into the existing pipe is deteriorated.

The flocking layer 20b is made of an elastomer layer 20
a fiber layer formed by applying an adhesive to the surface of a and adhering short fibers by an electrostatic effect, or an elastomer layer 2
This is a fiber layer formed by applying an adhesive to Oa and spraying short fibers with air. The short fibers used here are synthetic fibers such as aromatic polyamide, nylon, rayon, tetron, polyester, acrylic, vinylon, and polypropylene. It is also possible to use semi-synthetic fibers, artificial inorganic fibers, natural fibers, or the like.

The flocking layer 20b has a thickness of 2 mm or less. If the thickness exceeds 2 mm, the reverse insertion property when the lining tube 20 is reversely inserted into the existing pipe deteriorates.

Next, with reference to FIGS. 5 and 6, a description will be given of the repair of an existing pipeline performed using the reversing lining tube 20 of the present invention. In FIGS. 5 and 6, the same parts as those in the preceding example are denoted by the same reference numerals.

In FIG. 5, reference numeral 1 denotes an existing pipeline to be constructed buried underground, and reference numeral 2 denotes a main pipe connected to the existing pipeline 1. In order to repair the existing pipeline 1, the pipeline 1 is once cut from the main pipe 2.

As shown in FIG. 5, the existing pipeline 1 to be constructed is
Includes several bends. One end opening of pipeline 1
On the a side, a flat flexible reversing lining tube 20
Is wound around the reel device 8.

As a repair method, as in the above-mentioned prior art, first, a leading pig 3 having an outer diameter slightly larger than the inner diameter of the existing pipeline 1 is introduced into the pipeline 1 from the opening 1a of the existing pipeline 1. Next, a necessary amount of the adhesive 5 to be applied to the inner surface of the pipe 1 is introduced into the pipe 1 so as to be located on the subsequent stage side of the leading pig 3. Then, one end of the reversing lining tube 20 is turned back to the outside so that the one end of the reversing lining tube 20 is adjacent to the adhesive 5 and is annularly fixed to the conduit opening 1a.

Next, a suction device P is mounted and connected to the other end opening 1b of the pipeline 1, and a negative pressure is generated in the pipeline by operating the suction device P. Due to the negative pressure, the leading pig 3 and the adhesive 5 move toward the opening 1b side of the pipeline, and the inverted lining tube 20 is attached to the inner surface of the pipeline by the adhesive 5 while being turned over in the pipeline 1.

At this time, as shown in FIG. 6, since the reversing lining tube 20 moves in the reverse direction in the state of being adjacent to the adhesive 5, the adhesive 5 is applied to the inner surface of the conduit 1, and Folded part 20c of 20
Since it is also applied to the (flocked layer), the inverted lining tube 20 can be securely attached to the inner surface of the conduit.

As shown in FIG. 6, the inverted lining tube 20, which has a two-layer structure of the elastomer layer 20a and the flocking layer 20b, can smoothly be inserted through the tube even when it hits the bent portion 1c.

Then, as the inverted lining tube 20 is inverted, the flocked layer 20b becomes an outer layer and is adhered to the inner surface of the tube while impregnating the adhesive 5, so that the formed lining layer (flocked layer 20a impregnated with the adhesive) is formed. And the elastomer layer 20b) have a uniform thickness.

The reversing lining tube 2 of the present invention
Figure 5 shows the reverse lining method using
It is also possible to attach and connect a pressure device (not shown) to the opening 1a side of the pipe line 1 without using the suction device P shown in FIG.
In this case, a positive pressure is generated in the pipeline 1 by operating a pressure device (not shown). Due to the positive pressure, the leading pig 3 and the adhesive 5 move to the other end opening side 1b of the pipeline, and the reversing lining tube 20 is attached to the inner surface of the pipeline by the adhesive 5 while being turned over in the pipeline. .

[0031]

The reversal lining tube of the present invention has a two-layer structure of an elastomer layer and a flocked layer, and when the reversal is introduced into an existing pipe, the flocked layer becomes an outer layer and is adhered to the inner surface of the pipe. In addition to having the same adhesive impregnating effect as the conventional fabric layer, shortening the length of the flocking can reduce the thickness of the entire tube, and lowering the density of the flocking reduces the overall tube. Hardness can be reduced. Therefore, not only is the pipe penetration property improved when the tube is brought into contact with the inner surface of the tube while being inverted and introduced into the tube, but also because the flocked layer adheres to the inner surface of the tube while impregnating the adhesive, the existing thickness having a uniform thickness is improved. A lining layer of the tube is formed.

That is, by using the reversing lining tube of the present invention, a two-layer reversing tube (consisting of a polyurethane layer and a fabric layer) used in the conventional example and a one-layer reversing tube (only the polyurethane layer) are used. )
You can take advantage of each of the advantages of avoiding the disadvantages of each.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a work state when performing a reverse lining work on an existing underground pipe.

FIG. 2 is an explanatory view showing a construction state when a conventional reversing lining tube is used.

FIG. 3 is an explanatory view showing a construction state when a conventional reversing lining tube is used.

FIG. 4 (a) is a longitudinal sectional view showing an inverted lining tube of the present invention. (B) It is a perspective view showing the reversal lining tube of the present invention.

FIG. 5 is an explanatory view showing a working state when using the reversing lining tube of the present invention.

FIG. 6 is an explanatory view showing a construction state when the inverted lining tube of the present invention is used.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Existing piping 1a Opening 1b Opening 2 Main pipe 3 Leading pig 5 Adhesive 6 Conventional reversing lining tube 8 Reel 10 Elastomer layer of conventional reversing lining tube 11 Fabric layer of conventional reversing lining tube 20 Reversing lining of the present invention Tube 20a Elastomer layer of inverted lining tube of the present invention 20b Flocked layer of inverted lining tube of the present invention P Suction device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29L 23:00

Claims (6)

(57) [Claims] 1. A reversing lining tube for introducing a flexible reversing lining tube into a conduit while reversing the reversing lining tube from one end opening of an existing conduit buried in the ground and abutting the inner surface of the conduit. The inversion lining tube, wherein the inversion lining tube has a two-layer structure of an elastomer layer and a flocked layer, and when the inversion lining tube is reversely introduced into an existing pipe, the flocked layer becomes an outer layer and is adhered to the inner surface of the pipe. 2. The reversing lining tube according to claim 1, wherein the elastomer layer is a polyurethane layer, a polyester layer, a butyl rubber layer, a polyisobutylene layer, or a polyvinyl chloride layer. 3. The reversing lining tube according to claim 1, wherein the flocking layer is a fiber layer in which an adhesive is applied to the surface of the elastomer layer and short fibers are adhered by an electrostatic effect. 4. The inverted lining tube according to claim 3, wherein the short fibers of the flocking layer are aromatic polyamide, nylon, rayon, tetron, polyester, acryl, vinylon, or polypropylene. 5. The elastomer layer has a thickness of 0.3 to 1.5 mm.
The reversing lining tube according to claim 1, having a thickness of: 6. The inverted lining tube according to claim 1, wherein the flocked layer has a thickness of 2 mm or less.