JP2000306438A - Guide wire for radio rebroadcasting, etc - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide wire for radio rebroadcasting, etc., having conductors prevented from hanging down to a roadway if they are disconnected due to corrosion. SOLUTION: This guide wire for radio rebroadcasting, etc., is made by disposing, at its center part, a string-like member 1 made of non-metallic fiber having corrosion resistance, flexibility, and tension resistance, together twisting a plurality of conductors 2 therearound to prevent tension from being exerted on the member 1, and coating the conductors with an insulator 3 by extrusion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a guide line for radio rebroadcasting for transmitting to a radio rebroadcasting facility installed for emergency use such as a tunnel and for customer service.

[0002]

2. Description of the Related Art Conventionally, as a guide line for radio rebroadcasting,
It is supported and wired by insulators every few meters on the lining concrete such as the ceiling and the wall of a tunnel, etc., using a commercially available overhead distribution wire (OW wire).
When cracks occur in the insulating coating due to vibration or aging, moisture enters from the cracks, corroding the conductors, eventually leading to corrosion breakage of the conductors, and a problem that the wires hang down on the roadway.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems described in the prior art, and it is intended to provide a radio rebroadcasting system which does not drop on a road even when a conductor is corroded and disconnected. The purpose is to provide lines.

[0004]

The radio rebroadcasting guide wire of the present invention has a string-like member made of a non-metallic fiber having corrosion resistance and flexibility and tensile strength at the center thereof. In order to prevent tension from being applied to this member, a plurality of conductors are twisted around the member, and an insulator is further extruded and coated thereon.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, it has corrosion resistance made of aramid fiber and the like, and has flexibility and tensile strength. A string-shaped member 1 made of non-metallic fiber is disposed at the center, and a plurality of conductors 2 such as hard copper wire and hard aluminum wire are twisted around the member 1 so that tension is not applied to the member 1. Insulator 3 such as polyethylene
Is extrusion coated.

During normal use, tension is not applied to the string-like member 1 made of aramid fiber or the like, and a decrease in tensile strength due to a mechanical tensile load of the member 1 in normal use is not caused. Does not occur.

If the conductor 2 such as a hard copper wire breaks due to corrosion due to moisture ingress due to cracks in the insulator 3 or the like, the conductor 2 is cut and separated at the broken portion. A tensile load is applied to the string-shaped member 1 to prevent the guide line for radio rebroadcast, etc. according to the present invention from hanging down on the road.

[0008]

Since the present invention is configured as described above, it has the following effects. In a steady state, since a tensile load is not applied to a string-shaped member made of aramid fiber or the like, there is no decrease in tensile strength. At the time of conductor disconnection, a tensile load is applied to a string-like member made of aramid fiber or the like, and a guide line for rebroadcasting or the like is prevented from drooping on a roadway. Since the conductor is twisted around a string-shaped member made of aramid fiber or the like, the conductor is flexible, and wiring work is easy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 String-like member made of aramid fiber 2 Conductor 3 Insulator

(72) Inventor Motoyasu Tachiyama 5-25-12 Kawauchi, Asa-minami-ku, Hiroshima-shi, Hiroshima Santo-Hiroshima Branch (72) Inventor Shinichi Ishimatsu 2899 Ohara, Odai-shi, Oita City, Oita Prefecture West Japan (72) Inventor Hisashi Fujisawa 3-21-25-204 Midori, Asaminami-ku, Hiroshima-shi, Hiroshima F-term (reference) 5G313 AB01 AB02 AB10 AC01 AD07 AE05 5J046 AA05 AA17 AB00 TA06

Claims (1)

[Claims] 1. A cord-like member (1) made of non-metallic fiber having corrosion resistance and flexibility and tension resistance is arranged at the center, and tension is not applied to the member (1). A guide wire for radio rebroadcasting, wherein a plurality of conductors (2) are twisted therearound, and an insulator (3) is further extruded and coated thereon.