JPH09135514A - Method for branching ground line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to lessen additional construction of conduit lines when the branching processing of a cable becomes necessary by presuming the points on the cable which will require branching in the future after laying a ground line and preliminarily connecting the conduit line at those points using split joints which have a length enough to allow the branching of the cable. SOLUTION: When laying a conduit line 1 and a cable 3 initially, the points on the cable which will require branching in the future are presumed and the conduit line 3 is connected at those points using two-divided long split joints 2 which have a length L enough to allow the branching of the cable 3. Then, the cable 3 is drawn into the conduct line 3 to construct a ground line. When additional lines are necessary, only the earth and sand near the split joints 2 are removed and the cable 3 is exposed. Then, a branching process 4 is conducted at the exposed part of the cable 3 and the conduit line 1 is connected by installing a handhole 5 at the branched section 4 or using T-shaped split joints 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for branching an underground electric line.

[0002]

2. Description of the Related Art In an underground power line constructed by pulling power cables and the like into a pipeline buried underground, the number of customers increases after the underground power line is laid and a new service branch is required. In such a case, the cable was diverted by the power outage work in the handhole closest to the customer, and then the branch cable was pulled in through a newly buried pipeline route.

Alternatively, after the cable is pulled out from the pipeline, the sand is removed from the pipeline where the branch processing is required, the pipeline is cut, a handhole is installed there, and the cable is introduced to perform the branch processing. Has been given. In addition, split joints such as split halves may be used to connect these pipelines, but these split joints were merely for connecting the pipelines.

[0004]

As described above, since the branching of the cable can be performed only in the handhole, even if the cable and the pipeline are present in the immediate vicinity of the new customer, the position where the cable and the pipeline are separated from each other will be required. It was necessary to branch the cable in the handhole in and to construct a pipeline with a considerable distance from that to the customer and to pull in the cable. In this case, construction requires a lot of time, labor and cost,
Further, since a plurality of pipelines and cables are required in the same direction, there is a problem that a lot of space is required.

Alternatively, in the method of cutting the pipeline and installing the handhole therein, cable pulling out work is required, which takes time and labor. Further, since it is necessary to cut the pipeline in the ground, a considerable amount of excavation is required to secure the working space, which also requires a lot of time, labor and cost. Further, since any of the above methods is a power outage work, it is necessary to take measures so as not to have a great influence on consumers.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and when branching is required after laying an underground power line, it is possible to reduce the additional construction of the pipeline and to cut the pipeline. It provides a method of branching underground power lines that does not require cable pull-out and has less need for blackouts.
Assuming a place where branching is thought to be necessary after laying the underground power line, connect the pipes to this place in advance using a split joint with a length that allows branching of the cable,
This is a method of branching an underground electric line in which the split joint is removed to perform branching when branching is required.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a conceptual diagram showing the procedure of a method of branching an underground electric line according to the present invention. First, when laying the pipeline 1 and the cable 3 in the initial stage, assuming a point where the cable 3 should be branched in the future, a length (L) at which the cable 3 can be branched is preliminarily provided at this point. Have 2
The pipe line 3 is connected using a long split joint such as a split, and the cable 3 is drawn therein to construct an underground electric line. (Figure 1, b)

When it is necessary to increase the number of electric lines due to an increase in the number of important persons, only the earth and sand around the split joint 2 is removed to expose the internal cable 3. The exposed length (L) of the cable 3 has a length necessary for branching processing. (FIG. 1, b) Branching processing 4 is performed on the exposed portion of the cable 3 and a handhole 5 is installed in the branching processing unit 4, or T
A pipe joint is connected using a split joint 6 having a character shape. (Fig. 1, c)
If the handhole 5 is installed in the branch processing unit 4 as shown on the left side of FIG. 1C, the branch unit can be easily maintained and inspected. However, if there is no particular need,
As shown on the right side of (c), the space can be reduced by connecting the trunk line and the branch line with a T-shaped split joint to protect the branch part 4 and backfilling with earth and sand.

[0009]

As described above, according to the method for branching an underground power line of the present invention, even if branching is required after laying the underground power line, the cable is pulled out and the pipeline is cut. Since branch processing can be performed without the need for re-construction, it is possible to shorten the construction period, labor and cost. Also, since the need for power outages is small, the impact on customers is also small.

[Brief description of the drawings]

1 (a) to 1 (c) are conceptual diagrams showing a procedure of a method for branching an underground electric line according to the present invention.

[Explanation of symbols]

 1 Pipeline 2 Split Joint 3 Cable 4 Branch 5 Handhole 6 T-Shaped Split Joint

Claims (1)

[Claims] 1. A pipe joint is preliminarily provided at this place by using a split joint having a length capable of branching a cable, assuming a place where a branch is considered necessary after laying an underground power line. A branching method for an underground electric line, wherein the split joint is removed to branch the cable when branching is required.