JPH08296206A - Cable - Google Patents

Abstract

PURPOSE: To prevent the occurrence of accident due to a fall of snow ice, and to prevent the galloping vibration of a cable by embedding a heating wire in a covering member for covering the periphery of a conductor, and passing the current for heating. CONSTITUTION: A cable 1 to be used for suspending a bridge girder is formed of a cable main body 3 formed by binding multiple metal conductors 2, an insulating covering member 4 for covering the periphery thereof, and a heating wire 5 embedded in the covering member 4 over the full length thereof. The covering member 4 can be made of the carbon fiber material having conductivity. In the case where this cable 1 is used for a suspension bridge, at the time of snowfall, the heating coil 5 or the covering member 4 made of the carbon fiber is connected to a power source and the current is passed, the covering member 4 is heated by the Joule heat so as to melt the snow, piled on the peripheral surface of the cable 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable, and more particularly to a cable for preventing snow damage.

[0002]

2. Description of the Related Art Conventionally, a cable for suspending a bridge girder used in a bridge, such as a suspension bridge, has not been provided with snow damage countermeasures.

[0003]

For this reason, the snow accumulated on the upper surface of this type of cable freezes and solidifies, which is dangerous if it falls on the bridge, and the outer shape of the cable. There is a problem in that the deformation occurs and harmful vibration phenomenon such as galloping vibration occurs.

Therefore, an object of the present invention is to provide a cable which can solve the above problems.

[0005]

In order to solve the above problems, a first means of the present invention is a cable in which a heating wire is arranged in a covering member which covers the outer peripheral portion of a core wire.

In order to solve the above-mentioned problems, the second means of the present invention is a cable in which the covering member covering the outer peripheral portion of the core wire is made of a carbon fiber material.

[0007]

According to each of the above-mentioned constitutions, the heating wire is arranged in the covering member of the core wire or the covering member is made of the carbon fiber material. Therefore, an electric current is applied to the heating wire or the carbon fiber material to generate Joule heat. By doing so, the covering member can be heated. That is, the snow accumulated on the outer surface of the cable can be thawed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. In FIG. 1, 1 is a cable according to the present invention,
For example, in a cable for suspending a bridge girder, a cable body 3 in which a large number of metal core wires 2 are bundled, an electrically insulating coating member 4 that covers an outer peripheral portion of the cable body 3, Heating wire 5 embedded in the entire length
The heating wire 5 is connected to a power source (not shown).

When the cable 1 is used for a suspension bridge, for example, when heavy snow is expected or when it is snowing considerably, a current is applied to the heating wire 5 embedded in the cable 1 by the power source, The cover member 4 is heated by the Joule heat, and the snow accumulated on the upper surface of the cable 1 is thawed.

Therefore, the snow accumulated on the cable 1 does not freeze and solidify, and there is no fear of falling on the bridge, and the outer shape of the cable 1 is deformed to cause harmful vibration phenomena such as galloping vibration. There is no.

Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the heating wire is embedded in the covering member, but in the second embodiment, as shown in FIG. 2, the covering member 4 has conductivity. The carbon fiber material 6 is provided, and a power source (not shown) is connected to the carbon fiber material 6.

Also in this case, when a snowfall is expected and a current is applied to the carbon fiber material 6 by the power source,
The covering member 4 is heated by the Joule heat, and the snow accumulated on the upper surface of the cable 1 is thawed as in the first embodiment.

In this case, it is more economical to pass an electric current through a part of the covering member 4, for example, the carbon fiber material 6 located at least in the upper part where snow is accumulated.

[0014]

As described above, according to the structure of the cable of the present invention, the heating wire is arranged in the covering member of the core wire or the covering member is made of the carbon fiber material. By flowing Joule heat to generate Joule heat, it is possible to heat the covering member and therefore to dissolve the snow accumulated on the outer surface of the cable, so that frozen snow does not fall and cause an accident, In addition, it is possible to prevent the outer shape of the cable from being deformed by the frozen snow and causing a harmful vibration phenomenon such as galloping vibration in the cable.

[Brief description of drawings]

FIG. 1 is a perspective view showing a cross section of a cable according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a cross section of a cable according to a second embodiment of the present invention.

[Explanation of symbols]

 1 cable 2 core wire 4 covering member 5 heating wire 6 carbon fiber material

Claims (2)

[Claims] 1. A cable in which a heating wire is arranged in a covering member which covers the outer peripheral portion of a core wire. 2. A covering member for covering an outer peripheral portion of a core wire,
A cable characterized by being made of carbon fiber material.