JPH0584789B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is designed to reduce snow pressure (sedimentation force, movement This invention relates to improvements in methods for reducing pressure.

[Prior art and its problems]

If there is snow at the bottom of a steel tower built in a snowy area, snow pressure will be applied as time passes and temperature changes, and in some cases, the leg members that make up the bottom of the tower may break. There are things to do. To prevent this, steel tower legs in areas with heavy snowfall are strengthened by making their constituent members thicker, and snow is removed periodically by inputs.

As an alternative to this, the application of heat pipes that utilize geothermal energy has recently been proposed. The method is to bury one end of the heat pipe underground, place the other end along the parts of the tower legs that need to be protected, and use geothermal heat to melt snow near the parts. In other words, it certainly has the effect of reducing snow pressure. However, with this method, if the heat pipe is applied in the wrong place, the purpose of protecting the component cannot be achieved, so the heat pipe must be placed along all the target components. It cannot be said that it is very practical in terms of economy or construction.

[Purpose of the invention]

In view of these circumstances, the present invention has been made in order to provide an economical and efficient method for reducing snow pressure by devising the installation of heat pipes.

[Summary of the invention]

The gist of the present invention is that the back side of a steel tower leg section composed of main leg members, diagonal members, auxiliary members, etc., with the main leg member at the top and both sides composed of diagonal members, auxiliary members, etc.; The objective is to reduce the snow pressure applied to the members by installing at least one heat pipe heat dissipating part in the space surrounded by the backing surface connecting the diagonal members.

〔Example〕

To explain the present invention with reference to the drawings, in the embodiment shown in FIG.
It consists of horizontal members 2, diagonal members 3, auxiliary members 4, backing materials 5, and foundations 6, and there are three heat pipes 7 with one end buried underground near the foundations 6.
1, 72, and 73 are installed. The other ends of the heat pipes 71, 72, and 73, which serve as heat dissipation parts, are connected to the third
As shown in the figure, the main landing gear member 1 is the top side, and the diagonal member 3,
Between the members 2, 3, 4, etc., in a space S surrounded by side surfaces F1, F2 composed of auxiliary materials 4, etc., and a backing surface F3 composed of diagonal materials 3, lining materials 5, etc. They are laid separated from each other with a gap between them.
In this case, although not shown, a mounting jig having a thermal insulation function is appropriately interposed to secure the installation position.

The heat pipes 71, 72, 73 may have only one portion buried underground, or may be dispersed without being concentrated as shown in the figure.

Normally, even during snowfall, the underground temperature at a depth of several meters or more from the ground surface is around 10°C, so one end of the heat pipes 71, 72, and 73 is buried there as a heat collecting part. If the temperature at the surface of the earth falls, the heat in the earth will be quickly transported to the ground through the hydraulic fluid such as fluorocarbon ammonia sealed inside and radiated away. Therefore, even if it snows at that time and the legs of the steel tower are covered with snow, the heat pipes 71, 72, 73 will continue dissipating heat above ground, so the snow around the heat pipes 71, 72, 73 will be removed. and a cavity is formed around each of them. This cavity has heat pipes 71, 72, 73
It is formed into a cylindrical shape along the above-ground part of the ground. However, if the snow settles or moves, the heat pipe 7
Since the snow approaching 1, 72, and 73 is sequentially melted, the cavity becomes larger as it sequentially expands in the direction of snow settling or movement. Therefore, the line of force that causes the settling force of the snowfall is broken in the middle and becomes discontinuous, and the load of the snowfall applied to the diagonal members 3, auxiliary members 4, etc. of the tower legs is halved. In this case, it goes without saying that if the cavity caused by snow melting by the heat pipes 71, 72, 73 grows and reaches the surface of the member, the snow pressure applied to the member will be further reduced. In this example, soil heat is used as heat, but
If groundwater is available, it may be used as a heat source.

Further, although the heat dissipating portion of the heat pipe installed in the space S is shown to have a substantially straight shape, it may have a spiral shape or a zigzag shape. Of course, the number of heat dissipating parts of the heat pipe is not limited to three, and may be one.

〔Effect of the invention〕

As described above, according to the present invention, heat pipes using underground heat as a heat source are installed at specific locations on the tower legs to melt snow accumulation, so a small number of heat pipes are used to add snow to the constituent members of the legs. It can efficiently reduce pressure, is easy to construct, and has the effect of reducing costs for snow damage countermeasures, so it has great practical value.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the method according to the present invention, Fig. 2 is a schematic diagram showing the position of the heat pipe when viewed along line B-B in Fig. 1, and Fig. 3 is the same. It is a schematic diagram of the AA line section. 1: Main leg material, 2: Diagonal material, 3: Horizontal material, 4: Auxiliary material, 5: Backing material, 6: Foundation, 71, 72 and 7
3: Heat pipe, F1 and F2: side, F3:
Backing surface, S: Space.

Claims (1)

[Claims] 1 The back side of the tower leg section consisting of the main leg member 1, diagonal member 3, auxiliary member 4, etc., and both sides F1 consisting of the diagonal member 3, auxiliary member 4, etc. with the main leg member 1 as the top side ,F
2 and a backing surface F3 that connects the diagonal members 3.
The other end side of the heat pipes 71, 72, 73 is laid, and the heat pipes 71, 7 are installed using geothermal heat.
A method for reducing snow pressure on a steel tower leg member, characterized by melting snow around the other end of No. 2,73.