JPS64789B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connecting portion of an overhead power line, such as an overhead power line and an overhead ground wire, equipped with an optical communication function.

As this type of overhead electric wire, one in which an optical fiber is arranged in the center and a plurality of layers of twisted metal wires are provided on the optical fiber is known.

Conventionally, when connecting such overhead electric wires, the optical fiber at the connection part is covered with a tubular reinforcing body that has approximately the same outer diameter as the strands that constitute the twisted metal wire layer, and is wrapped around the outer periphery of the overhead electric wire. The connection was made by compressing or tightening a covered metal connecting pipe.

However, the outer diameter of the tubular reinforcing body wrapped around the optical fiber is limited by the diameter of the strand,
In addition, the inner diameter is limited by the diameter of the optical fiber, which limits the thickness of the tubular reinforcing body, that is, its strength, and if it is connected with high compressive force or tightening force, the tubular reinforcing body will be damaged and the optical fiber will be damaged. I was afraid that I would do it.

On the other hand, it is also conceivable to increase the outer diameter of the tubular reinforcing body, increase the wall thickness, and provide a predetermined interval between the strands of wire that constitute the twisted metal wire layer.
When compressed or tightened with a metal connecting tube, as shown in FIG.
4' may shift and be connected in an eccentric state. If the optical fibers are connected in such an eccentric state, not only a sufficient connection effect cannot be obtained, but also the optical fibers are deviated from the center position and are subjected to large bending stress.

The present invention improves these drawbacks.

In the present invention, the optical fiber refers to a single optical fiber, a collection of multiple optical fibers, a suitable resin coating layer, or a protective layer such as an aluminum pipe. say.

The present invention will be explained below based on an embodiment shown in FIGS. 2A to 2C.

Figure A shows a cross-sectional configuration of a connecting portion according to the present invention, and Figure B shows a cross-sectional configuration of a portion other than the connecting portion that is continuous with the connecting portion.

In the figure, 1 indicates an overhead electric wire, and the overhead electric wire 1
As shown in FIG. 2, an optical fiber 2 is arranged at the center, and a plurality of layers, for example two metal stranded wire layers 3 and 4, for example, an aluminum-coated steel stranded wire layer, are provided on the optical fiber 2. Further, the optical fiber 2 is protected over its entire length by an aluminum reinforcing tube 7. In the present invention, a tubular reinforcing body 5 is provided at the end of the overhead electric wire 1 constructed as described above, covering the optical fiber 2 (in this case, the aluminum reinforcing tube 7 is also covered), as shown in FIG. The insertion device is a compression connection, for example, using a metal connecting pipe 6 such as an aluminum sleeve of a retaining clamp wrapped around the outer periphery of the overhead electric wire 1.

The tubular reinforcement body 5 is made of aluminum, for example,
Its structure is as shown in FIG.
The metal wires 3' and 4' constituting the reinforcing body 5 are formed into a vertically divided sleeve-like structure having an outer diameter that allows them to be closely aligned in one layer on the outer periphery of the reinforcing body 5.

Further, the tubular reinforcing body 5 has a tip outer diameter of a second diameter.
As shown in Figure C, as a tapered shape,
The increase in the outer diameter of the overhead wire due to the installation of the large-diameter tubular reinforcing body 5 is made gradual, so that excessive bending stress is not applied to the wires 3', 4'.

In this embodiment, an example is shown in which the present invention is applied to an overhead wire having two layers of metal stranded wires 3 and 4, but the present invention is not limited to this, and a wire having three or more layers may be used. In this case, the number of stranded wire layers to be arranged in one layer on the outer circumference of the tubular reinforcing body 5 may be at least two, and the outer diameter of the tubular reinforcing body 5 may be such that at least two stranded wire layers are arranged on the outer periphery of the tubular reinforcing body 5. It is desirable that the strands forming the strands can be aligned in one layer, and that the strands disposed on the aligned strands should be closely aligned with each other in one or more layers.

Further, the tubular reinforcing body 5 is not limited to aluminum and may be made of other materials, and its shape may be arbitrarily adopted such as omitting a tapered portion, a non-split shape, a coil spring shape, etc.

Furthermore, the metal connecting pipe 6 can be arbitrarily applied to connection components in the retaining part, such as a straight sleeve-like one for a straight connection part, one for tightening an electric wire through a wedge, or one for tightening an electric wire through a bolt. .

According to the connection part of an overhead electric wire of the present invention, an optical fiber is arranged in the center and a plurality of layers of metal twisted wires are provided on the optical fiber, and a metal connection is made that covers the outer periphery of the overhead electric wire. In the connecting portion of the overhead electric wire connected by a tube, the optical fiber is wrapped by a large-diameter tubular reinforcing body having an outer diameter that allows the metal wires constituting at least two twisted metal wire layers to be further aligned. Since it is wrapped around the outer periphery of the overhead wire, when it is compressed and tightened with a metal connecting tube wrapped around the outer periphery of the overhead wire, there is less risk of the metal wire becoming eccentric as in the conventional method, and the strength of the tubular reinforcing body is sufficiently increased. It has the following effects.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram explaining the conventional example, Figure 2
Figure C shows an embodiment of the overhead electric wire of the present invention, Figure A is a cross-sectional view showing a connecting part, Figure B is a cross-sectional view of a part other than the connecting part continuous with the connecting part, and Figure C shows an example of a tubular reinforcing body. FIG. 1...Overhead electric wire, 2...Optical fiber, 3,4
...Metal twisted wire layer, 3', 4'...Metal wire, 5...
Tubular reinforcement body, 6...metal connecting pipe.

Claims (1)

[Claims] 1. At the connection part of an overhead electric wire, which is formed by placing an optical fiber in the center and having multiple layers of twisted metal wires on top of the optical fiber, and connecting it with a metal connecting tube that covers the outer periphery of the wire. , wherein the optical fiber is covered with a large-diameter tubular reinforcing body having an outer diameter that allows metal wires constituting at least two metal stranded wire layers to be aligned in a single layer. Connection part.