JP2002320308A - Rehabilitation method and rehabilitation pipe of existing pipeline - Google Patents

Abstract

(57) [Problem] To provide a lining rehabilitation method and a rehabilitation pipe for rehabilitating an inner surface of an existing pipeline in which power transmission and communication cables are laid without cutting the cable. . Kind Code: A1 A plurality of elongated belt-shaped profiles made of a synthetic resin having flexibility and having a fitting protrusion on one side edge and a fitting recess on the other side edge are prepared. . In the vicinity of the open end 41 of the existing pipeline 4, the side edges of these profiles 1 are connected by fitting to each other, and the rehabilitation pipe formed while forming the tubular rehabilitation pipe 10 so as to surround the cable 6. 10 is gradually fed in along the axial direction of the existing pipeline 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rehabilitation method for lining and rehabilitating an existing pipeline buried underground.
More specifically, the present invention relates to a rehabilitation method capable of rehabilitating an existing pipeline into which a power transmission or communication cable is inserted while the cables are connected, and a rehabilitation pipe for performing the rehabilitation method.

[0002]

2. Description of the Related Art When water and sewer pipes and gas pipes buried underground are deteriorated, as a technique for relining the inner surfaces of these existing pipelines, a synthetic resin formed in a long strip shape is used. A rehabilitation method has been known in which a sex profile (strip) is sequentially spirally wound while being fed into an existing pipeline to cover the inner surface of the existing pipeline. Each time the profile is wound in the existing pipeline, its side edge is fitted with the side edge of the adjacent profile, and is continuously stretched.

[0003]

As described above, in the method of spirally winding a profile to rehabilitate an existing pipeline,
An annular pipe-making device (winding device) formed along the inner surface of an existing pipeline to fit side edges of adjacent profiles together while advancing the profile
Must enter the pipeline. However, if the existing pipeline is a pipeline for laying power transmission cables and communication cables, and it is necessary to maintain those cables without cutting even during rehabilitation work, It is difficult to arrange such a pipe-making apparatus.

The present invention has been made in view of the above circumstances, and even in a pipeline in which power transmission and communication cables are already laid, the inner surface of the existing pipeline is rehabilitated without disturbing the cables. Rehabilitation methods that can be
It is an object of the present invention to provide a rehabilitation pipe for suitably performing the rehabilitation method.

[0005]

In order to solve the above-mentioned problems, a lining rehabilitation method for an existing pipeline according to the present invention is provided. By connecting the parts by fitting to form a tubular rehabilitation pipe, by gradually feeding the formed rehabilitation pipe into the existing pipeline along the axial direction of the existing pipeline,
This is to line the existing pipeline.

According to the present invention, even when a power transmission cable or a communication cable is already laid in an existing pipeline, a tubular rehabilitation pipe can be formed so as to surround the cable with a band-shaped profile. The existing pipeline can be relined without cutting the cable.

A rehabilitation pipe for carrying out the lining rehabilitation method is formed by connecting a plurality of elongated belt-like profiles made of a synthetic resin having flexibility to each other in a cylindrical shape by fitting their side edges to each other. Formed.

In order to ensure that the side edges of the profile are fitted to each other, a fitting projection having a substantially arrow-shaped cross section is formed on one side edge of the profile, and the fitting protrusion is formed on the other side edge. A fitting concave portion having a substantially U-shaped cross section that can be fitted to the mating convex portion is formed. Thereby, the side edge portions of the profile can be fitted easily and reliably.

Further, by forming the side edges of the profiles fitted to each other so as to be slidable along the axial direction, the rehabilitation pipe itself has a certain flexibility, It can be easily inserted into a bent existing pipeline.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

<Profile and Rehabilitation Pipe> First, FIG. 1 shows a cross-sectional shape of a profile constituting a rehabilitation pipe of the present invention. The profile 1 is a flexible member having a long and uniform cross section made of a synthetic resin such as polyvinyl chloride, polyethylene, polypropylene, and polyester. The illustrated profile 1 has a fitting projection 2 formed on one side edge (right side in the figure) with respect to the material axis and a fitting recess 3 formed on the other side edge (left side in the figure).

The fitting projection 2 has a substantially arrow-shaped cross section including a single protruding piece 21 and a pair of claw portions 22 formed on both sides near the tip.

The fitting recess 3 includes a pair of opposing pieces 31, 31 which are branched from the fitting protruding section 2 and face each other.
A pair of claws 32 formed inward near the tip of
32 and a substantially U-shaped cross section. Opposing piece 3
The facing distance between the two claws 2 in the fitting projection 2 is
It is slightly narrower than the thickness between 2,22. In addition, the length of the opposing piece 31 is slightly longer than the length of the protruding piece 21.

As shown in the figure, the profile 1 has a fitting projection 2 and a fitting recess 3 which are adjacent to each other.
Are fitted and connected. When the fitting protrusion 2 and the fitting recess 3 are fitted, the claw portion 22 of the fitting protrusion 2 and the claw portion 22 of the fitting recess 3 are engaged with each other and held so as not to be easily separated. .

By connecting a plurality of the profiles 1 and further connecting the profile 1 at the beginning and the profile 1 at the end, a tubular rehabilitation pipe 1 as shown in FIG.
0 is formed. The claw portions 22 of the fitting protrusions 2 and the claw portions 3 of the fitting recesses 3 so that the connection body of the profile 1 is cylindrical.
2 is the pitch P between the claws on the outside of the rehabilitation pipe 10
Are formed to be slightly larger than the pitch Q between the claw portions on the inner side.

The rehabilitating pipe 10 thus formed has a uniform circular cross section, and is stretched almost linearly by the length of the profile 1. However, the adjacent profiles 1 can be slightly shifted in the material axis direction. Therefore, when the rehabilitation pipe 10 in a straight pipe state as shown in FIG. 2 is bent by an external force, the respective profiles 1 slide along each other along the axial direction, and the rehabilitation pipe 10 in a curved pipe state as shown in FIG. Is formed. Profile 1 is made of polyvinyl chloride, the working width per one is 2-3 cm, and it is 20-
When the rehabilitation pipe 10 having a diameter of more than 10 cm to about 20 cm is formed by connecting 30 pieces, the rehabilitation pipe 10 can be smoothly bent until the radius of curvature becomes about several meters to 10 m.

The profile of the profile 1 is shown in FIG.
However, the present invention is not limited to the shape shown in FIG. Fitting convex portion 2 and fitting concave portion 3 that can be fitted to both side edges with respect to the material axis
As long as each has a shape, the shape of the intermediate portion, the claw portion 22 and the like can be slightly deformed.

<Relining Method> FIG. 4 is an explanatory diagram showing an outline of the operation of relining the existing pipeline 4 using the profile 1 as described above.

The existing pipeline 4 to be rehabilitated is buried so as to communicate between the manholes 5 and 5. A power transmission or communication cable 6 is laid in advance in the existing pipeline 4, and the cable 6 is connected to the other existing pipeline via each manhole 5.

In order to rehabilitate the existing pipeline 4, a plurality of profiles 1, 1, 1... Are prepared in a coiled state, and they are arranged on the ground near the manhole 5.
The required number of profiles 1 is calculated according to the inner diameter of the existing pipeline 4 to be rehabilitated. If the length of the existing pipeline 4 is short, the required number of profiles 1, 1, 1,... May be prepared in advance so as to be slightly longer than that.

Then, a plurality of profiles 1, 1, 1
Are collectively fed into the manhole 5, the tips of the profiles 1, 1, 1... Are aligned near the open end 41 of the existing pipeline 4, and the profiles 1, 1, 1. From the cylinder. While the rehabilitating pipe 10 is formed from the leading end of the profile 1, 1, 1,... To the succeeding part, the formed rehabilitating pipe 10 is gradually fed into the existing pipeline 4. The connection of the profiles 1, 1, 1,... Is performed manually in the manhole 5 or by using an appropriate connection jig (not shown).

Since the rehabilitation pipe 10 can be slightly curved as shown in FIG. 3, even when the existing pipeline 4 is bent in the middle, the rehabilitation pipe 10 is pushed in from the vicinity of the open end 41 so that the rehabilitation pipe 10 is bent. Can be inserted to the manhole 5 on the opposite side.

In this way, the inside of the existing pipeline 4 can be relined without cutting the cable 6 laid in the existing pipeline 4.

[0024]

As described above, the lining rehabilitation method for an existing pipeline according to the present invention is achieved by fitting the side edges of a plurality of profiles to each other near the opening end of the existing pipeline. Since the rehabilitation pipe is fed into the existing pipeline while forming the tubular rehabilitation pipe, the rehabilitation pipe can be formed so as to surround the cable laid in the existing pipeline.
As a result, without cutting the power transmission cable or communication cable,
Relining of existing pipelines can be performed.

According to the rehabilitation pipe of the present invention, the lining rehabilitation method can be easily implemented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a profile constituting a rehabilitating pipe according to the present invention.

FIG. 2 is a perspective view showing a form of a rehabilitation pipe of the present invention.

FIG. 3 is a perspective view showing a curved state of the rehabilitation pipe of the present invention.

FIG. 4 is an explanatory view showing an embodiment of the lining rehabilitation method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Profile 10 Rehabilitation pipe 2 Fitting convex part 3 Fitting concave part 4 Existing pipeline

Claims (4)

[Claims] 1. A rehabilitation formed while a tubular rehabilitation pipe is formed by connecting mutually side edges of a plurality of elongated strip-shaped profiles by fitting near an open end of an existing pipeline. A lining rehabilitation method for an existing pipeline, wherein the pipe is gradually fed into the existing pipeline along the axial direction of the existing pipeline. 2. A rehabilitating pipe formed by connecting a plurality of elongated belt-like profiles made of a synthetic resin having flexibility to each other by fitting their side edges to each other to form a cylindrical shape. 3. The profile has a fitting projection with a substantially arrow-shaped cross section on one side edge, and a fitting with a substantially U-shaped cross section that can fit with the fitting projection on the other side edge. The rehabilitation pipe according to claim 2, further comprising a mating recess. 4. The rehabilitating pipe according to claim 2, wherein side edges of the mutually fitted profiles are slidably held in the axial direction.