JP2000329261A - Pipe line contrast method - Google Patents

Abstract

(57) [Summary] [Problem] To provide a conduit control method that enables conduit control after a cable laying conduit is buried in the ground. SOLUTION: A plurality of pipelines in which color bands of different colors are continuously provided in the pipeline in the surface length direction of the pipelines are buried underground, and each pipeline is colored in front and rear hand holes. Contrast with band color. There is also a method of applying the number of color bands and numbering instead of the colors of the color bands. In addition, the same color or number is assigned to both ends of the same pipeline for multiple pipelines already buried underground, and different colors or numbers are assigned to multiple pipelines in pipeline units. It also provides a way to do that.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable laying pipeline which is buried in the ground by a plurality of cables on the same route.

[0002]

2. Description of the Related Art An underground conduit for laying a cable is generally made of, for example, a hard vinyl conduit (VE) described in JIS C8430 or a hard vinyl chloride pipe (VP, VU) described in JIS K6741. ) Etc. are used.
Usually, a plurality of these pipelines are buried directly in the ground as indicated by reference numeral 2 in FIG. 3, and cables are laid therein.

In recent years, from the viewpoint of economy, a large-diameter pipe 1 having an inner diameter of 250 mm (hereinafter referred to as a parent pipe) is buried in the ground as shown in FIG. A method of inserting a plurality of small-diameter pipes 2 (hereinafter, referred to as a sheath pipe) by pulling the distal end thereof has begun to be used. FIG. 5 shows a situation in which a cable 5 such as an optical fiber cable is laid on the sheath tube 2 laid as described above. FIG.
, 4 indicates a handhole. As the main pipe 1, for example, a hard vinyl chloride pipe (VP) described in JIS K6741 is used.

Since the main pipe 1 is generally 4 m in length,
The main pipes are buried underground while connecting them every 4 m, and a standard 250 m route is constructed. In addition, hand holes 4 are installed at both ends of the 250 m route. The place where the master pipe 1 is laid is generally on the side of the road or on the sidewalk.

After that, a plurality of sheath tubes are laid in the parent tube 250m by pulling the tip. As the sheath tube, for example, a tube made of high-density polyethylene is used, and as shown in FIG.
0 m or more. To lay the sheath tube to the parent tube,
There are a method of laying multiple sheath tubes at a time, a method of arranging sheath tubes one by one in order, and the like.

FIG. 6 shows a state in which a plurality of optical fiber cables 2 wound around a drum 3 are drawn from the handhole 4 into the pipeline 1 and laid. Reference numeral 3 denotes a drum. FIG. 7 shows an example of a cross-sectional structure of a pipeline; high-density polyethylene pipe 6, and FIG.

[0007]

A plurality of the above-mentioned cable laying pipes, especially pipes for laying optical fiber cables, are laid. In many cases, the plurality of sheath tubes are all of the same size, as indicated by reference numeral 2 in FIG. 5, and in this case, it is extremely difficult to compare the pipelines in the front and rear handholes. There is a problem that there is.

[0008] In the method of laying the optical fiber cable by pulling the tip, since a nominal line is previously set in the pipeline,
By pulling this, it is possible to compare the pipelines.However, in the recent construction method of laying optical fiber cables into the pipeline by air pressure, the nominal line is not included in the pipeline in advance, so There was no way to control the pipeline in the front and rear handholes.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a conduit control method which makes it possible to visually control a conduit after a cable laying conduit is buried in the ground.

[0010]

The following means are provided as means for achieving the above-mentioned object. First means: A plurality of pipelines in which color bands of different colors are continuously provided in the pipeline along the surface length direction of the pipelines are buried underground, and each pipeline is placed in front and rear handholes. A conduit contrast method that contrasts with the color of the color band.

Second means: a plurality of pipelines in which different numbers of color bands are continuously provided in the pipeline in the surface length direction of the pipelines are buried underground, and each of the pipelines is provided in the front and rear handholes. A conduit contrast method in which conduits are contrasted by the number of color bands.

Third means: a plurality of pipelines, each of which has a different number for each pipeline in the surface length direction of the pipeline, are buried underground, and each pipeline is numbered in front and rear handholes. A conduit control method.

Fourth means: The same color or number is assigned to both ends of the same pipeline for a plurality of pipelines already buried in the ground, and the plurality of pipelines are assigned in units of pipelines. A conduit contrast method, giving different colors or numbers.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment relating to identification using a sheath tube of the present invention will be described. In addition, the sheath tube laying method itself is the same as that of the conventional method shown in FIGS.

[Example 1] First, in the sheath tube, the dimensions were 50 mm in inner diameter and 60 mm in outer diameter, the material was high-density polyethylene, and the base color was black. A color band was continuously applied in the surface length direction of the sheath tube as indicated by reference numeral 7 in FIG. The sheath tube 60 having such a color band was manufactured to have a length of 250 m. Three sheath tubes are manufactured and all three have different color bands; red, white,
Blue.

Next, a master pipe buried underground; inner diameter 250 m
/ The above-mentioned three sheath tubes were pulled in at a length of 250 m by tip pulling and laid.

In the three sheath tubes laid as described above, the color of the color band was confirmed at both ends;
Sheath tube control was easily performed.

[Example 2] The sheath tube itself was the same as that in Example 1, and numbering was continuously performed in the surface length direction of the sheath tube as shown by reference numeral 8 in FIG. Such a numbered sheath tube 60 'was manufactured to a length of 250 m.
Three sheath tubes are manufactured and numbered differently from each other; N
o. 1, No. 2, No. It was set to 3.

After the three sheath tubes were pulled into the parent tube and laid in the same manner as in Example 1, the numbering was confirmed at both ends of the sheath tube and at the handhole. As a result, the sheath tube was easily controlled.

Although the above embodiment has been described with respect to an example in which a color band or numbering is applied in advance, the fourth embodiment of the present invention is also applied to a sheath tube already laid.
A similar pipe line contrast can be made by coloring or numbering the portion visible in the handhole. In the case of a color band, the number of color bands may be different between the sheath tubes according to the second means instead of the color change.

[0021]

According to the present invention as described above, it is an object of the present invention to provide a conduit control method which enables conduit control after a cable laying conduit is buried in the ground. Can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing only a first embodiment of a first embodiment of a conduit contrast method according to the present invention, only by the appearance of a sheath tube.

FIG. 2 is an explanatory view showing a second embodiment of the third embodiment of the conduit contrast method according to the present invention only by the appearance of a sheath tube.

FIG. 3 is a sectional explanatory view showing an example of laying a pipeline;

FIG. 4 is a cross-sectional explanatory view showing an example of laying a conduit;

FIG. 5 is an explanatory cross-sectional view showing a situation in which a cable is laid in the sheath tube laid in FIG. 4;

FIG. 6 is an explanatory diagram showing a situation in which a cable is drawn into a pipe and laid.

FIG. 7 is an explanatory cross-sectional view of a pipeline.

FIG. 8 is an external explanatory view of a pipeline.

[Explanation of symbols]

 Reference Signs List 1 parent tube 2 sheath tube 4 hand hole 5 cable; optical fiber cable 60 sheath tube (with color band) 60 'sheath tube (with numbering)

Claims (4)

[Claims] 1. A plurality of pipes in a cable laying pipe buried underground with a plurality of pipes on the same route, in which color bands of different colors are continuously applied in a pipe length direction along a pipe surface length direction. A conduit contrast method in which the conduits are buried underground, and each conduit is contrasted with the color of the color band at the front and rear handholes. 2. In a cable laying pipe line buried underground in a plurality of pieces along the same route, a plurality of pipes in which different numbers of color bands are continuously applied in the surface length direction of the pipe line for each pipe line. A conduit contrast method in which the conduits are buried underground, and each conduit is contrasted by the number of color bands in the front and rear handholes. 3. In a cable laying pipeline buried in a plurality of underground routes along the same route, a plurality of underground pipelines in which different numbers are continuously assigned in units of pipeline along the surface length direction of the pipeline. A pipe contrast method in which the pipes are buried and the pipes are numbered in the front and rear handholes. 4. In a cable laying pipeline which is buried underground with a plurality of cables on the same route, the same color or number is provided at both ends of the same pipeline with respect to a plurality of pipelines already buried underground. And assigning different colors or numbers to a plurality of conduits in units of conduits.