JPS59129516A - Method of repairing bare wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing bare electric wires and a repair method suitable for repairing an overhead ground wire with a built-in optical cable.

In general, the overhead ground wire installed above the Urishima Line is susceptible to damage such as wire melting due to lightning strikes due to its purpose, and when such damage occurs, conventionally the overhead ground wire was The original cable was removed and replaced with a new one, but recently, the former cable composite type overhead ground wire, which has the original cable built into the center, is made of only metal stranded wire. Unlike the structure, as mentioned above, the optical cable for signal transmission is housed inside.
Even if it is damaged, it is not possible to simply replace it with another one immediately. Therefore, in the case of bare wires such as optical cable composite overhead ground wires,
The damaged part must be repaired so as not to adversely affect the internal structure of the original cable.

The present invention provides a method for repairing bare electric wires in view of the above-mentioned dotted lines.

An embodiment of the construction method of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the bare wires generally designated by the reference numeral 1 are a large number of metal wires 11A around the protective tube 2 that houses the optical cable 3.

11B, . . . and an inner layer strand 12 consisting of a large number of metal wires 12A, 12B, twisted together.

Damage to a lane caused by lightning usually extends to two or three adjacent strands, as shown by reference numeral 4 in FIG. 1, and may even extend to the inner strands in the radial direction of the wire.

The first step in the repair method of the present invention is as shown in FIG.
, 11B, .

The purpose is to expose the entire area at the loss wj portion 4. Therefore, as shown in FIG.
The stranded wire 11 is cut 5 over its entire circumference at approximately the center in the length direction to separate the strands 11A, 11B, . . . into left and right parts. When the damaged part 4 has reached the inner layer stranded wire 12, it goes without saying that the inner layer stranded wire 12 is cut and each of the strands 12A is cut.

12B, . . . are expanded in the same manner as described above, although not shown in FIG. Become.

Next, as shown in FIG.
Exposure length t of twist @12! A vertically divided steel sleeve 6 having a length equivalent to that is fitted onto the exposed portion of the inner layer strand 12 having a length t2. It is easy to use this vertically divided sleeve 6 when it is divided into about eight parts.

Next, each of the strands 11A, 11B, . A steel ladderbox-shaped sleeve 7 as shown in FIG. 6 having the same length as 6 is fitted from the radial direction and crimped using a compressor. As is clear from the figure, the ladderbox-shaped sleeve 7 has a main body with a substantially U-shaped cross section and a sliding lid 71 inserted therein. The individual wires 11A, 11B, etc. that are tightly attached thereon are compressed toward the center of the bare electric wire 1 and tightened together, thereby completing the repair work of the present invention.

According to the repair method of the present invention, the damaged part of the bare wire is covered with a steel ladder box sleeve and compressed, so that the damaged part is restored to a state having sufficient mechanical strength and electrical conductivity. be able to.

In particular, in the case of a bare wire with a built-in main cable, the main cable is protected by the @ made vertically split sleeve provided on the inner layer of the steel ladder box sleeve, so when crimping the ladder box sleeve, Even though a large compressive force is applied, there is an effect that there is no adverse mechanical effect on the original cable inside.

[Brief explanation of the drawing]

Figures 1 to 6 are explanatory diagrams of the method of this invention, with Figure 1 being a side view showing a damaged bare wire, and Figure 2 being the same as in Figure 1.
3 is a partially broken side view showing a state in which each strand is expanded at the cut point of the damaged stranded wire, and FIG. 4 is a partially broken side view showing a state in which a vertically split sleeve is fitted. A side view, FIG. 5 is a partially cutaway side view showing a state in which the ladderbox type sleeve is crimped, and FIG. 6 is a perspective view of the ladderbox type sleeve. 1... Bare electric wire, 11... Outer layer stranded wire, 11A, 11B
...Element wire, 12...Inner layer twisted wire, 12A, 12B...
- Element wire, 4...Damaged part, 6...Steel vertically split sleeve, 7...Steel ladder box type sleeve. Representative Patent Attorney Mamoru Takeuchi

Claims (1)

[Claims] A stranded wire having a damaged part in a bare electric wire is cut over the entire circumference at the location of the damaged part, and each strand constituting the stranded wire is spread out in the radial direction, one in U, and one in II. 1
- exposing the strands or core at the location of the damage over the longitudinal width t of the damage, and a width t2 greater than the length of the damage; a step of fitting a vertically divided steel sleeve having a length at least equal to the chiseling length t onto the vertically divided steel sleeve; and expanding the vertically divided steel sleeve toward the outside in the radial direction. A step of bending each strand back and bringing them into close contact with each other, and fitting a steel ladderbox-shaped sleeve having at least the same length as the vertical sleeve over each strand that is tightly attached to the vertically divided sleeve. A method for repairing bare electric wires, comprising the step of compressing the wires.