JP2002254536A - Pipeline regeneration pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipeline regeneration pipe having flexibility, light in weight, easy to handle, having excellent gas barrier properties and used so as to be inserted into a superannuated pipe. SOLUTION: The pipeline regeneration pipe consists of an inner pipe 1, which has ridges 11 projected from the outer peripheral surface 12 thereof at a predetermined interval and has an almost smooth inner peripheral surface 13 formed thereto, and an outer pipe 2, which has projected stripes 22 formed to the outer peripheral surface 12 thereof at the top parts of the ridges 11 from a resin material excellent in gas barrier properties and has recessed grooves 21 formed thereto between the adjacent ridges 11. These inner and outer pipes 1 and 2 are formed in a non-bonded state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pipe formed on the inner and outer double walls of an inner pipe and an outer pipe. In particular, gas leakage accidents, etc. can be prevented beforehand by inserting them into pipes near the safe period, such as city gas supply pipes buried underground or gas pressure feed pipes installed in chemical factories. The present invention relates to a pipe rehabilitation pipe suitable for use for prevention.

[0002]

2. Description of the Related Art When a gas pipeline is rehabilitated by using a pipe rehabilitation pipe of this kind, since the gas pipeline has a portion which is plumbed at a right angle, it is easy to pull in the pipe to be rehabilitated. In order to achieve this, it is important to have considerable flexibility. On the other hand, it is also conceivable to use a generally popular pipe made of, for example, polyvinyl chloride (PVC) resin as a pipe rehabilitation pipe. Conceivable.

[0003]

SUMMARY OF THE INVENTION However, PVC
In the case of pipes, even when the pipe wall is double-walled, it is used as a gas pipe for refining gas pipes because it has poor physical properties of gas barrier to be used as an air supply pipe for gas sent under internal pressure However, there is a problem that it cannot withstand the heat. Therefore, in order to solve such a problem, a pipe using a gas barrier resin has been proposed. (See, for example, JP-A-2000-266245)

Therefore, the present inventors have aimed at solving the above-mentioned problems and have developed a pipe which has the flexibility and flexibility required for a pipeline rehabilitation pipe, is lightweight and easy to handle. Various studies and developments have been made on a new type of tube that is still excellent in gas barrier performance, and we have come to develop a satisfactory tube with all these characteristics. .

[0005]

Means taken to achieve the object will be described with reference to the partial reference numerals used in the drawings showing the embodiments. The first structure of the pipeline rehabilitation pipe according to the present invention will be described. Is provided with a ridge 11 protruding at a predetermined interval on the outer peripheral surface 12 side, and has an inner tube 1 in which the inner peripheral surface 13 is formed substantially smooth, and has excellent gas barrier performance on the outer peripheral surface 12 side. A ridge 22 is formed at the top of the ridge 11 by the resin material, and the adjacent ridges 11,
The outer pipe 2 has a groove 21 formed between the outer pipes 11 and the inner pipe 1 and the outer pipe 2 are formed in a non-adhered state.

The second structure has an inner tube 1 provided with a helical ridge 11 projecting at a predetermined interval on the outer peripheral surface 12 side, and an inner peripheral surface 13 formed substantially smooth. A helical ridge 22 is formed at the top of the helical ridge 11 by a resin material having excellent gas barrier performance on the outer peripheral surface 12 side, and the helical ridges 11, 1 adjacent to each other are formed.
The outer tube 2 has a spiral groove 21 formed between the outer tube 2 and the inner tube 1 and the outer tube 2 in a non-adhered state.

Further, the third structure comprises an inner tube 1 having an annular ridge 11 protruding at a predetermined interval on the outer peripheral surface 12 side and having an inner peripheral surface 13 formed substantially smooth; On the outer peripheral surface 12 side, an annular ridge 22 is formed at the top of the annular ridge 11 by a resin material having excellent gas barrier performance, and an annular groove 21 is formed between the adjacent annular ridges 11, 11. The outer tube 2 is formed, and the inner tube 1 and the outer tube 2 are formed in a non-adhered state.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has such a structure. In implementing the present invention, the inner pipe 1 and the outer pipe 2 are brought into contact only at the top of the ridge 11 of the inner pipe 1. Or the inner pipe 1 and the outer pipe 2 are
Can be embodied as a configuration in which it is in contact only with the top of the ridge and between the adjacent ridges 11 and 11. Further, it is preferable that the pipe wall forming the outer pipe 2 has a structure in which the top of the ridge 11 is formed to be thicker than other parts.
It is preferable from the point of abrasion resistance.

Further, in practice, the outer tube 2 is preferably used.
Polyamide, ethylene-
It is preferable to use a resin selected from the group consisting of a vinyl alcohol copolymer, a polyvinylidene chloride copolymer, fluorine, polyethylene terephthalate, and polyacrylonitrile, since it is easy to obtain a tube having excellent gas barrier properties.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams showing a pipe rehabilitation pipe according to a main embodiment of the present invention, and FIG. 1 shows an outer shape and a cross-sectional shape by vertically cutting an upper half portion of a pipe body. FIG. 2 and FIG. 2 are exploded views for explaining the means for manufacturing the tubular body.

The pipeline rehabilitation pipe P shown in the embodiment is shown in FIG.
As shown in FIG. 2, the inner pipe 1 and the outer pipe are made of a synthetic resin material alone without using a coated steel wire or the like for maintaining the shape of the pipe and maintaining the compressive deformation resistance. 2 is a tube with a double inner and outer wall.

As shown in FIG. 2, the inner tube 1 shown in this embodiment is made of a soft polyvinyl chloride (SPVC) resin material which is formed in a flat band shape and is directed outward from an intermediate portion in the width direction. The band material 10 having a shape having a protruding ridge 1c is
The outer peripheral surface of the inner tube 1 is wound spirally on the tube forming core material, and the left and right side edges 1a, 1b are superposed and fused and integrated as shown by an arrow a in FIG. A tube provided with a spiral ridge 11 protruding at a predetermined interval on the side 12, and has a structure in which an inner peripheral surface 13 is formed substantially smooth.

On the other hand, for the outer tube 2 shown in this embodiment, nylon 12 is selected as a resin material having excellent gas barrier performance, and the whole is extruded in a horizontal shape having substantially the same thickness using this. A strip 20 (shown as a U-shaped cross section in FIG. 2) is formed, and both side edges 2a and 2b of the strip 20 are arranged on the top of the spiral ridge 11 so as to overlap each other. Is spirally wound on the outer peripheral surface 12 side of the inner tube 1, and the overlapped portions are fused and integrated with each other, and a thick-walled spiral ridge 22 is formed on the top of the spiral ridge 11. And adjacent spiral ridges 11, 11
A structure in which a spiral groove 21 is formed by recessing a portion located therebetween in the small diameter direction.

The outer tube 2 and the inner tube 1 are in contact with each other only on the top of the spiral ridge 11, but are not bonded, and the other portions are separated by a small gap g. And the inner tube 1 and the outer tube 2 are in a non-adhered state in which the inner tube 1 and the outer tube 2 can move relative to each other. When the tubes are bent, the inner tube 1 and the outer tube 2 can bend and deform individually. , And can be deformed independently of each other.

The nylon 12 constituting the outer tube 2 shown in the embodiment was subjected to a city gas permeability test in a sheet state. Table 1 shows the test results.

[0016]

[Table 1]

According to this gas permeation test, a pipe formed as in the above embodiment using nylon 12 as a pipe forming material was inserted into a pipe of an aged city gas to form a pipe for pipe rehabilitation. It was confirmed that when used, it was possible to exhibit sufficient gas barrier performance.

On the other hand, with respect to SPVC used as a material constituting the inner tube 1 in the above embodiment, a city gas permeability test was performed in the same manner as described above in a sheet state. Table 2 shows the test results.

[0019]

[Table 2]

According to this gas permeation test, a single pipe or a double pipe using only a SPVC material as a pipe forming material cannot provide a sufficient gas barrier performance. It has been confirmed that there is a risk of permeation and it is not suitable for use.

FIG. 3 shows a pipe rehabilitation pipe P of another embodiment. The rehabilitation pipe P of this embodiment is a part of the spiral groove 21 of the outer wall 2 described in the first embodiment. But,
The inner tube 1 has a structure in which it is in contact with the outer peripheral surface of the inner tube 1 also between the adjacent spiral ridges 11, 11. The other points are the same as those of the tube structure in the first embodiment.

FIG. 4 shows a pipe rehabilitation pipe P of still another embodiment.
Spiral ridge 1 forming inner tube 1 described in the embodiment
1 has a T-shaped cross section, in other words, a rail shape for a track, and the outer tube 2 abuts on the outer peripheral surface of the inner tube 1 on the top portion and between the adjacent spiral ridges 11 on the inner tube 1. The structure is For other points,
This is the same as the tube structure in the first embodiment.

FIGS. 5 and 6 show a pipe structure manufactured by still another manufacturing means. The pipe rehabilitation pipe P shown in this embodiment is a ridge on the inner pipe 1. 11
The outer tube 2 and the ridges 22 of the outer tube 2 both have a ring-shaped tube structure. In this pipe structure, a concave groove 21 of the outer pipe 2 is formed in an annular shape in the ridges 11 adjacent to the inner pipe 1.

As shown in FIG. 6, the manufacturing means pushes the resin tube for forming the inner tube into a well-known caterpillar-shaped endless moving mold (not shown) and sucks the resin tube from the outer peripheral surface by the mold. Then, the inner tube 1 having an annular uneven shape is formed. Subsequently, a resin tube 20a having gas barrier properties is extruded around the inner tube 1 by another resin extruder, and at the same time, air between the inner tube 1 and the tube 20a is sucked toward the extruder. Then, the pressure can be reduced and the inner tube 1 can be deformed so as to follow the corrugated waveform. FIG.
Is formed in this manner.

Although the embodiments which are considered to be representative of the present invention have been described above, the present invention has the above-mentioned constitutional requirements, achieves the above-mentioned objects of the present invention, and is appropriately modified within a range having the following effects. Can be implemented.

[0026]

As is clear from the above description, the pipe rehabilitation pipe according to the present invention is an inner / outer double pipe, and the structure of the inner pipe is formed at a predetermined interval on the outer peripheral surface side. Since it has a separated ridge and the inner peripheral surface is formed substantially smooth,
Since the resistance of gas passing through the interior can be minimized or minimized, the ridge acts as a compressive deformation resistant member of the tube, and does not require heavy steel wire or iron wire,
Since the entire tube can be reduced in weight and a resin material with excellent gas barrier performance is selected and used as the material for forming the outer tube, the gas permeating the inner tube wall can be reliably used by the outer tube. In addition, it is possible to surely prevent re-permeation toward the outside of the tube, and there is a remarkable advantage that the gas barrier tube can be used safely and safely.

Further, while the pipe is an inner / outer double pipe, both the inner pipe and the outer pipe are formed in a corrugated shape, and the inner pipe and the outer pipe are brought into a non-adhered state in which the inner pipe and the outer pipe can be relatively moved. At the time of bending, the inner pipe and the outer pipe can be bent and deformed individually and can be deformed independently of each other, so that their relative movement is restricted only in the pipe axis direction and in the pipe circumferential direction. With respect to external forces in the bending direction, the two tubes can move in the circumferential direction and bend and deform independently of each other, so that they are tubes with excellent gas barrier performance but also have excellent flexibility. It also has a remarkable effect that the insertion pipe can be easily inserted into the rehabilitation pipe.

These effects are the same whether the tube having the second configuration has the uneven corrugated waveform or the tube having the third configuration having the corrugated waveform. This is the effect that it has.

[Brief description of the drawings]

FIG. 1 is a front view of an upper half cutaway showing a first embodiment.

FIG. 2 is an exploded view for explaining a means for manufacturing a pipe wall.

FIG. 3 is a front view of an upper half cutaway showing a second embodiment.

FIG. 4 is a front view of an upper half cutaway showing a third embodiment.

FIG. 5 is a front view of an upper half cutaway showing a fourth embodiment.

FIG. 6 is an exploded view for explaining means for manufacturing a pipe according to a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner tube 10 Inner tube forming band material 11 Projection 12 Outer peripheral surface 13 Inner peripheral surface 2 Outer tube 20 Outer tube forming band material 21 Concave groove 22 Convex line 2a Side edge 2b Side edge

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) // B29L 23:00 B29L 23:00 (72) Inventor Yasushi Sakane 1-2-1 Sakaecho, Takatsuki City, Osaka Prefecture No. To Taku Kogyo Co., Ltd. (72) Inventor Masaru Sato 1-2-1, Sakaemachi, Takatsuki City, Osaka Prefecture No.1 F-term in TOKYO TAKYO CO., LTD. (Reference) 3H111 AA03 BA15 CA03 CA43 CA53 CB03 CB14 CB23 DA14 DB17 4F100 AK16B AK17B AK27B AK42B AK46B AK48 AK69B BA02 DA11 DA13A DD01A DD01B JD02 JA02A14A03A12AA AG28 AH43 SA17 SC03 SD04 SH17 SH18

Claims (7)

[Claims] An inner tube (1) having a ridge (11) projecting at a predetermined interval on an outer peripheral surface (12) side and having an inner peripheral surface (13) formed substantially smooth; A ridge (22) is formed at the top of the ridge (11) by a resin material having excellent gas barrier performance on the outer peripheral surface (12) side, and the adjacent ridge (1) is formed.
A conduit comprising an outer tube (2) having a concave groove (21) formed between 1) and (11), wherein the inner tube (1) and the outer tube (2) are formed in a non-adhered state; Rehabilitation pipe. 2. An inner tube (1) having a helical ridge (11) projecting at a predetermined interval on an outer peripheral surface (12) side and having an inner peripheral surface (13) formed substantially smooth. A spiral ridge (22) is formed at the top of the spiral ridge (11) by a resin material having excellent gas barrier performance on the outer peripheral surface (12) side, and the adjacent spiral ridge ( An outer tube (2) having a spiral groove (21) formed between 11) and (11), and the inner tube (1) and the outer tube (2) are formed in a non-adhered state. Pipe rehabilitation pipe. 3. An inner tube (1) having an annular ridge (11) projecting at a predetermined interval on an outer peripheral surface (12) side and having an inner peripheral surface (13) formed substantially smooth. An annular ridge (22) is formed at the top of the annular ridge (11) by a resin material having excellent gas barrier performance on the outer peripheral surface (12) side, and the adjacent annular ridge (11), (11) An annular groove (2
A pipe rehabilitation pipe comprising an outer pipe (2) formed with 1), wherein the inner pipe (1) and the outer pipe (2) are formed in a non-adhered state. 4. The inner pipe (1) and the outer pipe (2) are formed by a ridge of the inner pipe (1).
The pipe rehabilitation pipe according to any one of claims 1 to 3, wherein the pipe rehabilitation pipe is in contact with only the top of (11). 5. The inner pipe (1) and the outer pipe (2) are formed by a ridge of the inner pipe (1).
The pipeline rehabilitation pipe according to any one of claims 1 to 4, wherein the pipe rehabilitation pipe is in contact with only the top of the (11) and the adjacent ridges (11), (11). 6. A structure in which a tube wall forming the outer tube (2) is formed thicker at the top of the ridge (22) than at other portions. A pipe rehabilitation pipe according to any one of the above. 7. The resin material forming the outer tube (2) is a resin selected from polyamide, ethylene-vinyl alcohol copolymer, polyvinylidene chloride copolymer, fluorine, polyethylene terephthalate, and polyacrylonitrile. The pipeline rehabilitation pipe according to any one of claims 1 to 6.