JPH061011B2 - Method of reducing snow pressure on steel tower legs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a snow pressure (settling force, settling force, etc.) applied to a leg member such as a steel tower constructed in a snowfall area, for example, a steel tower for transmission lines, a steel tower for ski lifts, The present invention relates to a method for reducing the moving pressure).

[Prior art and its problems] If there is snow under the steel tower constructed in the snowfall area,
As the snow pressure is applied with the passage of time and changes in temperature,
In some cases, the members of the legs that form the lower part of the steel tower may be damaged. To prevent this, the steel tower legs in the heavy snowfall area
It is practiced to increase the strength by thickening the constituent members, or to periodically remove snow by inputting.

Recently, as an alternative method, a method of melting snow by heat in the ground using a heat pipe has been proposed. The method is
One end of a heat pipe containing a working fluid such as chlorofluorocarbon is buried in the ground, and the other end is placed along the member to be protected of the steel tower leg. Is a method of melting. This method certainly has the effect of snow pressure, but in the case of this method, it is expected that the purpose of member protection cannot be achieved if the place where the heat pipe is applied is incorrect. The heat pipe has to be installed, which is not very practical in terms of economy or construction.

[Object of the Invention] In view of such a situation, the present invention has been devised to provide an economical and efficient improved snow pressure reduction method by devising a method of laying a heat pipe.

[Summary of the Invention] The gist of the present invention is to install the other end side of a heat pipe having one end side buried in the ground by penetrating into a plurality of space portions on a side surface formed of a member of a steel tower leg, It is to reduce the snow pressure applied to the member.

[Examples] The present invention will be described with reference to the drawings. Fig. 1 shows a part of a plurality of steel tower legs, which are a main member 1, a horizontal member 2, a diagonal member 3, an auxiliary member 4, and a foundation. 5 and the like, and at least one heat pipe 6 whose one end side is buried in the ground near the foundation 5 is laid there. In this case, the other end of the heat pipe 6 which serves as a heat radiating portion penetrates a plurality of triangular shaped space portions A, B, C, D formed on the side surface composed of the main material 1, the diagonal material 3, the auxiliary material 4 and the like. However, the parts intersecting with the members 3 and 4 are mutually connected by locking the members 3 and 4 with a mounting jig (not shown) having a heat insulating function in the middle. Are kept out of contact with.

In the illustrated example, the heat pipe 6 is laid on only one of the side surfaces, but it is also laid on the other side surface in the same manner. Of course, the heat pipe 6 may be formed in a zigzag shape in advance when it is installed, or may be formed when it is installed. Even when it is snowing or snowing, the temperature in the ground at a depth of several meters from the ground surface is around 10 ° C, so if one end of the heat pipe 6 is buried there as a heat collecting part, When the temperature is lowered, the heat in the ground is rapidly transported to the ground portion and radiated by changing the phase of the working fluid such as chlorofluorocarbon sealed in the heat pipe 6. Therefore, at that time, even if the steel tower legs are covered with snow due to snowfall, the heat pipe 6 continues to radiate heat, and the heat is transmitted to the leg members 3 and 4 and effectively melts the surrounding snow without being dissipated. As shown by the broken line, a cylindrical cavity 7 is formed along the heat pipe 6. Then, when the snowfall settles and / or moves, the snow approaching the heat pipe 6 is sequentially melted, so that the cavities 7 are successively expanded in the direction in which the snow sinks and / or move and become large. As a result, the lines of force that are the sinking force of snow are also discontinuous,
The snow pressure applied to the diagonal member 3, the auxiliary member 4, etc. will be reduced. Of course, when the cavity 7 grows and reaches another member, the snow pressure applied to the member is further reduced.

EFFECTS OF THE INVENTION According to the present invention, a heat pipe using the heat of the ground as a heat source is laid at a specific portion of the steel tower leg portion to melt snow, so that the leg portion is configured with a small number of heat pipes. It has the effect of reducing the snow pressure applied to the members and reducing the cost of measures against snow damage, and its practical value is great.

[Brief description of drawings]

FIG. 1 is an explanatory view showing one embodiment of the method according to the present invention. 1: Steel tower main material, 2: Horizontal material, 3: diagonal material, 4: auxiliary material, 5: foundation, 6: heat pipe, 7: cavity, A, B, C and D: space.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Shimoshima 3550 Kidayomachi, Tsuchiura City, Ibaraki Prefecture Hitachi Cable Ltd. (72) Inventor Yuji Karashi 3550 Kidayomachi, Tsuchiura City, Ibaraki Prefecture Hitachi Cable Shares Inside the Metal Research Laboratory (72) Inventor Kenichi Kikuchi 3550 Kidayo-cho, Tsuchiura City, Ibaraki Prefecture Hitachi Cable Ltd. Inside the Metal Research Laboratory (72) Takashi Yamazaki 1500 Kawajiri-cho, Hitachi City, Ibaraki Hitachi Cable Co., Ltd.

Claims (1)

[Claims] 1. A steel tower main material 1, a diagonal material 3, and an auxiliary material 4 of a steel tower leg portion.
In a plurality of spaces A, B, C, D on the side surface composed of
One end side is laid through the other end side of the heat pipe 6 buried in the ground, and the other side heat is utilized to melt the snow around the other end side of the heat pipe 6 Snow pressure reduction method.