JPH1187U - Corrugated composite pipe - Google Patents

Abstract

(57) [Abstract] [Problem] To provide a corrugated composite pipe which can lay a plurality of pipes at once. Also, improve the pull-in performance of the inner tube. SOLUTION: In a corrugated composite pipe in which a corrugated inner pipe 2 is accommodated in a corrugated outer pipe 1, a wave crest of the corrugated inner pipe is flat. Also, the peak of the wave of the inner tube 2 does not fall into the trough of the inner surface of the outer tube.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a corrugated composite pipe suitable for use as a flexible cable conduit for drawing in and laying electric wires and cables.

[0002]

[Prior art]

 As a conventional flexible cable conduit, a single-layer corrugated pipe is mainly used, and in principle, one corrugated pipe accommodates one cable or the like. That is, for example, when power and control cables are laid, corrugated pipes for laying the power cables and control cables are separately laid, and the power cable and control cable are laid one by one in these corrugated pipes. Was.

[0003]

[Problems to be solved by the invention]

 However, in such a structure, there is a problem that the installation cost of the corrugated pipe increases in proportion to the number of installation lines such as cables. In order to avoid such a problem, if a plurality of cables and the like are housed in a single corrugated pipe, the cables and the like come into contact with each other, resulting in poor insertability and damage to the cables and the like. There was a problem to give.

An object of the present invention is to provide a corrugated composite pipe which can lay a plurality of pipes at once.

[0005]

[Means for Solving the Problems]

 To explain the configuration of the present invention for achieving the above object, the present invention relates to a corrugated composite pipe in which a corrugated inner pipe is accommodated in a corrugated outer pipe, and a corrugated pitch of the corrugated inner pipe. The relationship between A and the corrugated pitch B of the corrugated outer tube is characterized in that B ≧ 2A.

[0006]

[Function] With the composite pipe with such a corrugated structure, a plurality of pipes can be simultaneously laid by a single laying operation. When laying a plurality of cables, etc., lay them in one corrugated outer pipe, and lay others in a corrugated inner pipe. In this way, a plurality of cables and the like can be laid in a common corrugated outer tube without contacting each other.

In particular, if the relation between the pitch A of the corrugated inner tube and the pitch B of the corrugated outer tube is B ≧ 2A, the unevenness due to the corrugation of the corrugated inner tube and the corrugated outer tube is assumed. The portions can be prevented from engaging with each other, so that flexibility and retraction can be improved. Further, if the relationship between the pitch A of the corrugated inner tube and the pitch B of the corrugated outer tube is B ≧ 2A, the corrugated pitch A of the corrugated inner tube is larger than the corrugated outer tube. The pitch of the corrugated inner pipe is much smaller than B, and the flexibility of the corrugated inner pipe becomes better than the flexibility of the corrugated outer pipe. The bending of the corrugated inner pipe easily follows the bending of the corrugated outer pipe. Can be done.

[0008]

【Example】

 FIGS. 1A and 1B show an embodiment of a corrugated composite pipe according to the present invention.

The corrugated composite pipe of this embodiment has a structure in which a corrugated inner pipe 2 is accommodated in a corrugated outer pipe 1. The corrugated outer tube 1 is formed of a hard material which is not easily damaged, such as high density polyethylene (HDPE) or polyvinyl chloride (PVC). Thus, even if the corrugated outer tube 1 is formed of a hard material, it is corrugated, so that the necessary flexibility can be sufficiently obtained. Since the corrugated inner pipe 2 is in the corrugated outer pipe 1 and corrugated, any material may be used. However, in this case, it is necessary that the pitch A of the corrugated inner tube 2 and the pitch B of the corrugated outer tube 1 be B ≧ 2A. The reason for this is to improve the flexibility and pull-in property by preventing the uneven portions formed by corrugation from engaging with each other. The inner diameter of the corrugated inner tube 2 depends on the outer diameter of the cable or the like inserted into the corrugated inner tube 2 and the corrugated outer tube 1, but is about 1/3 or less of the inner diameter of the corrugated outer tube 1. Is preferred.

[0010] Such a corrugated composite pipe has, for example, a power cable, a communication cable, an optical fiber cable, an electric wire, a communication line, an optical fiber core wire, and the like in the corrugated outer pipe 1 and the corrugated inner pipe 2. Used for laying either separately. When laid in this manner, the cables and the like can be laid in the corrugated composite pipe without contacting each other.

The production of such a corrugated composite tube is performed, for example, by feeding a preformed corrugated inner tube 2 from a die nipple at the time of forming the corrugated outer tube 1 by a normal outer surface evacuation method. It can be carried out. Also, the corrugated inner pipe 2 can be retracted after the production of the corrugated outer pipe 1.

Further, when the corrugated inner pipe 2 and the corrugated outer pipe 1 are corrugated so that the wave peaks facing each other intersect at a portion where they are in contact with each other, the wave peak of the corrugated inner pipe 2 is corrugated. The corrugated inner pipe 2 can be easily pulled in without falling into the wave trough on the inner surface of the corrugated outer pipe 1.

The number of the corrugated inner pipes 2 in the corrugated outer pipe 1 may be plural.

If a wire such as a cable is inserted into the corrugated outer tube 1 and the corrugated inner tube 2 in advance, the operation of drawing the cable or the like later becomes easy.

The corrugated composite pipe of the present invention can be used not only as a protection pipe for laying cables or the like, but also as a transport pipe for fluids.

[0016]

[Effect of the invention]

 As described above, the corrugated composite pipe according to the present invention can provide the following excellent effects.

(A) Since the inner tube with a corrugated structure is housed in the outer tube with a corrugated structure, there is an advantage that when a plurality of tubes need to be laid, they can be laid by a single laying operation.

(B) Therefore, not only can the laying cost be significantly reduced, but also the laying of a plurality of pipes occupies only one pipe width, which facilitates securing a laying place. There is a point.

(C) In the present invention, in particular, the relationship between the pitch A of the corrugated inner pipe and the pitch B of the corrugated outer pipe is B ≧ 2A. Irregularities due to corrugation of the outer tube can be prevented from meshing with each other, so that flexibility and retractability can be improved. (D) If the relation between the pitch A of the corrugated inner tube and the pitch B of the corrugated outer tube is B≥2A, the corrugated pitch A of the corrugated inner tube is better. It is much smaller than the pitch B of the corrugated outer tube, and the flexibility of the corrugated inner tube is better than the flexibility of the corrugated outer tube. The bending of the pipe can be easily followed.

[Submission date] December 3, 1998

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

[Means for Solving the Problems]

To explain the configuration of the present invention for achieving the above object, the present invention relates to a corrugated composite pipe in which a corrugated inner pipe is accommodated in a corrugated outer pipe, and a wave crest of the corrugated inner pipe. the top outer surface of a flat and wave crests in the attached corrugated tube is characterized by write Manai fell in wave troughs of the inner surface of the corrugated outer tube.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

In particular, when the outer surface of the top of the wave crest of the corrugated inner tube is flattened so that the wave crest of the corrugated inner tube does not fall into the wave trough on the inner surface of the corrugated outer tube , and Ki out to ensure that the concave-convex portion that by the corrugation of the corrugated outer tube is not engaged, that Ki is possible to improve the pull-inclusive property.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

The corrugated composite pipe of this embodiment has a structure in which a corrugated inner pipe 2 is accommodated in a corrugated outer pipe 1. The corrugated outer tube 1 is formed of a hard material that is not easily damaged, such as high-density polyethylene (HDPE) or polyvinyl chloride (PVC). Thus, even if the corrugated outer tube 1 is formed of a hard material, it is corrugated, so that the necessary flexibility can be sufficiently obtained. Since the corrugated inner pipe 2 is in the corrugated outer pipe 1 and corrugated, any material may be used. However, in this case, it is desirable that the pitch A of the corrugated inner tube 2 and the pitch B of the corrugated outer tube 1 be B ≧ 2A . The reason for this is to improve the flexibility and pull-in properties by preventing the uneven portions formed by corrugation from engaging with each other. The inner diameter of the corrugated inner tube 2 depends on the outer diameter of the cable or the like inserted into the corrugated inner tube 2 and the corrugated outer tube 1, but is about 1/3 or less of the inner diameter of the corrugated outer tube 1. Is preferred.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

The corrugated inner tube 2 can be retracted after the production of the corrugated outer tube 1.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

[0019] (c) uneven portion due to corrugation of the corrugated inner tube and a corrugated outer pipe can prevent engage, Ru can improve the flexibility and retraction properties.

[Brief description of the drawings]

1A and 1B show an embodiment of a corrugated composite pipe according to the present invention, wherein FIG. 1A is a cross-sectional view and FIG.

[Explanation of symbols]

 1 Corrugated outer tube 2 Corrugated inner tube

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[Procedure amendment]

[Submission date] December 3, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims for utility model registration

[Correction method] Change

[Correction contents]

[Utility model registration claims]

Claims (1)

[Utility model registration claims] 1. A corrugated composite pipe in which a corrugated inner pipe is accommodated in a corrugated outer pipe, wherein a corrugated pitch A of the corrugated inner pipe and a corrugated pitch B of the corrugated outer pipe are provided. The relationship is B ≧ 2A.