JP2008190194A - Snow melting apparatus for cable-stayed bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for efficiently melting snow and ice sticking to a cable of a cable-stayed bridge. <P>SOLUTION: This snow melting apparatus for the cable-stayed bridge comprises a heating unit composed of an upper half part 12 and a lower half part 14 of semicircular shape. The upper half part and the lower half part have heat insulating materials 12a, 14a arranged inside, heat radiating materials 12b, 14b arranged outside, and a plurality of planar heating elements 12c, 14c arranged at equal angle spaces between the heat insulating materials and the heat radiating materials. The heating unit is installed to cover the cable by uniting the upper half part and lower half part, and snow and ice sticking to the outer surface of the heating unit are melted by carrying a current to the planar heating elements to heat the heat radiating materials. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a snow melting device used for a cable-stayed bridge cable.

  The cable-stayed bridge is a type of bridge that has many examples of construction in Japan, and is characterized in that the main girder is supported by a cable extending from the main tower (see FIG. 7A). The cable stayed bridge has a problem of snow adhesion to the cable in the snowy cold region, and it has been reported that the adhering snow freezes and hits the traveling vehicle.

  Conventionally, various efforts have been made regarding the removal of snow attached to the cable of a cable-stayed bridge, and the present inventors have also proposed a novel snow removal device and method (Patent Document 1, Patent Document 2, and (See Patent Document 3).

Japanese Patent Application No. 2004-6196 Japanese Patent Application No. 2005-139221 Japanese Patent Application No. 2005-144879

  Fortunately, the device described in Patent Document 1 has been well received, and the device described in Patent Document 2 also has a remarkable effect when performing snow removal near the attachment portion of the cable with the main tower. It is assumed that it will demonstrate. On the other hand, the device described in Patent Document 3 does not remove the snow attached to the cable, but covers the cable with a snow melting device and heats the snow melting device to melt the snow and ice attached to the outer surface of the device. This prevents snow and ice from adhering to the cable.

  The present invention is an improvement and development of the device described in Patent Document 3. That is, in the apparatus described in Patent Document 3, since the sheet containing the heating wire is used, the snow-melting surface is not uniform (snow is melted well immediately above the heating wire, but the snow-melting efficiency is high in other locations. However, an object of the present invention is to provide an apparatus for melting snow more efficiently on snow and ice attached to a cable.

  A snow melting device for a cable-stayed bridge cable of a cable-stayed bridge according to claim 1 of the present application includes a heating unit constituted by a semicircular arc upper half and a semicircular arc lower half, and the upper half However, it has a heat insulating material arranged on the inner side, a heat radiating material arranged on the outer side, and a plurality of planar heating elements arranged at an equal angle between the heat insulating material and the heat radiating material, The lower half is a heat insulating material disposed inside, a heat dissipating material disposed outside, and a plurality of planar heating elements disposed at an equal angle between the heat insulating material and the heat dissipating material, The heating unit is installed so as to cover the cable by uniting the upper half and the lower half, and the sheet heating element is energized to apply the heat dissipation material. It is configured to melt snow and ice adhering to the outer surface of the heating unit by heating. Is shall.

  The snow-melting device for a cable-stayed bridge cable of a cable-stayed bridge according to claim 2 of the present application is the device according to claim 1, wherein each of the planar heating elements is attached to the base material and the base material. The base material is formed of any of mica, ceramic, glass, devitro ceramics, ceramics, or plastic, and the heat-generating functional material is mainly composed of an oxide compound of tin and lead. It is characterized by being a component.

  The snow melting device for a cable-stayed bridge cable of a cable-stayed bridge according to claim 3 of the present invention is the device according to claim 2, wherein the heat-generating functional material adheres to the base material by a thermal spraying method, a vacuum deposition method, or a binder. It is characterized by being performed by either.

  According to the present invention, snow and ice adhering to the outer surface of the heating unit can be efficiently (evenly) melted with a relatively simple device, thereby avoiding the attachment of snow and ice to the cable. Further, according to the present invention, it is possible to easily install the snow melting device not only on a new cable but also on an existing cable.

  Next, a snow melting device for cable-stayed bridge cables according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a diagram schematically illustrating a state where a snow melting device for a cable-stayed bridge cable according to a preferred embodiment of the present invention is attached. A snow melting device for a cable-stayed bridge cable according to a preferred embodiment of the present invention generally indicated by reference numeral 10 in FIG. 1 includes a heating unit arranged to cover the cable-stayed bridge cable.

  The heating unit is composed of a semicircular arc-shaped upper half 12 and a semicircular arc-shaped lower half 14, and by combining the upper half 12 and the lower half 14, as will be described later. It is formed so as to form a cylindrical shape covering the cable.

  The upper half portion 12 of the heating unit is disposed between the heat insulating material 12a disposed on the inner side, the heat radiating material 12b disposed on the outer side, and the heat insulating material 12a and the heat radiating material 12b so as to extend to each 36 °. A sheet-like heating element 12c. Moreover, the lower half part 14 of a heating unit is also between the heat insulating material 14a arrange | positioned inside, the heat radiating material 14b arrange | positioned outside, and the heat insulating material 14a and the heat radiating material 14b similarly to the upper half part 12. Each of which has five sheet heating elements 14c arranged at an angle of 36 °.

  The heat insulating materials 12a and 14a of the heating unit are for preventing the heat generated from the planar heating elements 12c and 14c from escaping, and for avoiding the adverse effects of the heat on the cable. The heat dissipation members 12b and 14b of the heating unit are for facilitating the transfer of heat generated from the planar heating elements 12c and 14c. Preferably, the heat dissipating materials 12b and 14b are formed of a material having good heat transfer (for example, aluminum).

  Preferably, as the sheet heating elements 12c and 14c, heating elements described in Japanese Patent Application Laid-Open No. 2004-207212 are used. More specifically, the planar heating elements 12c and 14c have a heat generating functional material 12c1 (14c1) and a base material 12c2 (14c2) to which the heat generating functional material is attached (see FIG. 6).

  The exothermic functional material 12c1 (14c1) contains an oxide compound of tin (Sn) and lead (Pb) as a main component, and may contain chlorine (Cl) as a subcomponent. Further, as a minor component, it may contain a small amount of other metal oxides (an oxide having various valences) such as antimony oxide, bismuth oxide, lead oxide, gallium oxide, indium oxide, ITO, etc. Good. Furthermore, a small amount of simple metals such as zinc, tin, antimony, bismuth, lead, gallium, and indium may be included.

  The exothermic functional material 12c1 (14c1) is manufactured, for example, by adding a reducing agent to the above raw material diluted with an organic solvent, heating and mixing, cooling the obtained dilution, and obtaining a precipitate and a supernatant. .

  Examples of the base material 12c2 (14c2) include mica, ceramic (eg, alumina, zirconia, titanium oxide, silicon carbide, silicon nitride), glass, devitro ceramics, ceramics, or plastic (eg, melamine resin, urea resin, phenol resin). Thermosetting resins such as epoxy resins and urethane resins, silicone resins, vinyl fluoride resins, high melting point polyesters, high melting point amides, polyacetals, polycarbonates, polysulfones, polyether sulfones, polyphenylene oxides, polyphenylene sulfides, polyarylates, polyethers Engineering such as ether ketone, polyamide imide, polyimide, polyether imide, methyl pentene copolymer, polyamino bismaleimide, bismaleimide-triazine thermosetting aromatic polyimide Heat-resistant thermoplastic resin such as plastic) is used.

  The planar heating elements 12c and 14c are formed by adhering the heat generating functional material 12c1 (14c1) to the substrate 12c2 (14c2) using a thermal spraying method, a vacuum deposition method, or a binder. In addition, the code | cord (not shown) for connecting to an electricity supply means is attached to the heat-generation functional material 12c1 (14c1).

  The snow melting device 10 is installed at a desired location of the cable by joining the upper half 12 and the lower half 14 of a predetermined length so as to surround the cable and connecting them with screws 16 (see FIG. 4). . Preferably, a concave portion 12d and a convex portion 14d that are fitted to each other are provided at both edges so that the upper half portion 12 and the lower half portion 14 can be easily combined (see FIG. 5).

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say, it is something.

  For example, in the embodiment described above, a total of 10 sheet heating elements are arranged, but the number of sheet heating elements arranged may be more or less. The apparatus of the present invention is also suitable for a cable-stayed bridge of a type in which two parallel cables are stretched (see FIG. 7B) or a type of a cable-stayed bridge in which a single cable is stretched. (See FIG. 7 (c)).

It is the figure which showed roughly the attachment state of the snow melting apparatus for cable-stayed bridge cables which concerns on preferable embodiment of this invention. It is the perspective view which showed the cross section of the snow melting apparatus of FIG. It is the cross-sectional view which showed the state by which the snow melting apparatus of FIG. 1 was attached to the cable. It is an enlarged view of the part 4 of FIG. It is the cross-sectional view which showed the state which the upper half part and lower half part of the snow melting apparatus of FIG. 1 isolate | separated. It is the figure which showed typically the planar heating element of the snow melting apparatus of FIG. FIG. 7A is a general view of a general cable-stayed bridge, FIG. 7B is a plan view showing a type of cable-stayed bridge in which two parallel cables are stretched, and FIG. It is the top view which showed the type of cable-stayed bridge with which one cable was stretched.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Snow melting apparatus for cable-stayed bridge cables 12 Upper half part of heating unit 12a Heat insulating material 12b Heat radiation material 12c Planar heating element 14 Lower half part of heating unit 14a Thermal insulation material 14b Heat radiation material 14c Planar heating element 16 screw

Claims (3)

A snow melting device for cable stayed bridge cables,
A heating unit composed of a semicircular arc upper half and a semicircular lower half comprises
The upper half is a heat insulating material disposed on the inside, a heat dissipating material disposed on the outside, and a plurality of planar heating elements disposed at an equal angle between the heat insulating material and the heat dissipating material, A plurality of surfaces in which the lower half is disposed at an equal angle between the heat insulating material disposed inside, the heat dissipating material disposed outside, and the heat insulating material and the heat dissipating material. And a heating element
Installing the heating unit so as to cover the cable by uniting the upper half and the lower half;
An apparatus configured to melt snow and ice adhering to an outer surface of the heating unit by energizing the planar heating element to heat the heat dissipation material. Each of the planar heating elements has a base material and a heat generating functional material attached to the base material,
The base material is formed of any of mica, ceramic, glass, devitro ceramics, ceramics, or plastic, and the heat generating functional material is mainly composed of an oxide compound of tin and lead. The apparatus of claim 1. The apparatus according to claim 2, wherein the heat generating functional material is attached to the base material by any one of a thermal spraying method, a vacuum vapor deposition method, and a binder.

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