JPS6034089B2 - Overhead ground wire tie-down section - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tie-down section for an overhead ground wire equipped with an optical communication function, which is formed by passing an optical fiber through a twisted wire layer made by twisting together a plurality of metal wires, such as aluminum coated wires.

Conventionally, the structure of the pulling part of this type of overhead ground wire was to strip off the stranded wire layer from the end of the overhead ground wire to expose a predetermined length of optical fiber, and then crimp the end of the stranded wire layer with a retaining clamp. The optical fiber exposed from the stranded wire layer passes through the retaining clamp and extends to a connector or junction box, which is then connected to the optical fiber of the other optical fiber-containing overhead ground wire.

Since the optical fiber is therefore exposed, it becomes necessary to provide a protective coating to the exposed portion by other special means. This work requires precision and requires work on a steel tower, making the work difficult. Furthermore, there is a risk that the exposed optical fibers will not be adequately protected. SUMMARY OF THE INVENTION An object of the present invention is to provide a retaining section for an overhead ground wire containing optical fibers, which facilitates the connection work of optical fibers and can sufficiently protect the optical fibers.

In the present invention, the optical fiber refers to a single optical fiber, a set of a plurality of optical fibers, or a fiber coated with plastic or the like.

To achieve the above object, according to the invention, the stranded wire end of the overhead ground wire is extended together with the optical fiber through a detention clamp to the connector or junction box of the optical fiber. Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an overhead ground wire 1 containing optical fiber. An aluminum-coated steel wire 2 as a twisted wire layer is provided on the outside of the metal tube 3, and the optical fibers 4 are passed through the inside of the metal tube 3 in a loose formation. The optical fiber-containing overhead ground wire 1 is inserted into the hole of the retaining clamp 6 at a predetermined length 5 from the end of the aluminum-coated mesh wire 2, and is compressed and fixed, and is secured to the steel tower 8 via the rod 7. There is. The jumper wire 11 is fixed to the steel tower 8 in the middle, and connected to jumper sockets 12 of the retaining clamp 6 at both ends. The optical fiber-containing overhead ground wire 1 passes through the detent clamp 6 together with the optical fiber without cutting the aluminum sheathed wire 2 beyond the detent clamp 6, and the aluminum sheathed wire 2 passes through the wire fixing plug 13. and is fixed to it. The wire fixing plug 13 is screwed into the wall of a junction box 14 fixed to the steel tower 8, and the optical fiber 4 is exposed from the aluminum-coated wire 14 inside the junction box 14, and its terminal The male connector 5 can be attached at. A female connector 6 is attached to the end of the optical fiber 4 of the other optical fiber-containing overhead ground wire 1, and the connectors 15 and 16 are connected to each other within the junction box 14. The aluminum coated cable wire 2 is
The connection box 1 is removed without being cut off from the retaining clamp 5.
4, the cutting length is short, and the optical fiber 4 is covered with the aluminum coated steel wire 2 up to the junction box 14, so that it is not exposed to the outside.

In the embodiments shown in FIGS. 2 and 3, the aluminum coated wire 2 is fixed to the junction box 14 by the wire fixing plug 13, so that there is a gap between the aluminum coated wire 2 and the optical fiber 4 in the longitudinal direction. This is advantageous when significant movement may occur. In FIG. 4, the ends of the aluminum-coated steel wire 2 are inserted into the holes of the male and female connectors 17 and 18 of the optical fiber 4 and fixed therein.

As described above, according to the present invention, the strands of the optical fiber-containing overhead ground wire extend from the retaining clamp to the connector or junction box without being cut off, and there is no exposed part, so that the special protection unlike the conventional one is achieved. There is no need to provide a covering, which simplifies the work.

Further, since the optical fiber is coated with the twisted wire layer beyond the clamp, the optical fiber is sufficiently protected.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of an overhead ground wire used in the present invention, FIG. 2 is a front view showing an embodiment of the present invention, and FIG.
FIG. 4 is a cross-sectional view of a main part showing the inside of the junction box shown in detail, and FIG. 4 is a cross-sectional view of a main part showing another embodiment of the present invention. 1... Overhead ground wire, 2... Aluminum coated cable wire, 4... Optical fiber, 6... Detention clamp, 14
...Connection box, 17...Male connector, 18...
...Female connector. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. Crimp the end of the stranded wire layer of an overhead ground wire, which is equipped with an optical fiber and a stranded wire layer made of a plurality of metal wires provided on the optical fiber, with a retaining clamp, and hold it to the steel tower, The optical fiber passes through the suspension clamp and is pulled out to the outside, and is introduced into a connector or junction box attached to the steel tower, and then connected to other optical fibers at the suspension section of the overhead ground wire, where the strands of the overhead ground wire are A retaining portion of an overhead ground wire, characterized in that the end of the layer extends together with an optical fiber passing through a retaining clamp to a connector or a junction box.