JPH0321711B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a snow melting device for protecting steel towers constructed in snowy areas, such as power transmission line towers and ski lift towers, from damage caused by snow; In particular, it concerns a steel tower snow melting system that uses underground heat and heat pipes.

[Prior art and its problems] For example, if we look at a transmission line tower passing through a mountainous area, a downward force called a settling force and a horizontal force called a moving force act on the lower part of the tower due to snow accumulation. In some cases, steel tower members may be damaged or
There is a possibility that the tower itself will tilt. For this reason, the size of the members used has been increased and reinforcing members have been used, but these measures alone cannot be said to be perfect in terms of economic efficiency. Therefore, consideration is being given to reducing the stress applied to steel tower members locally by melting snow using heat pipes using underground heat. In this method, one end of the heat pipe is buried underground to serve as a heat collecting section, and the other end is used as a heat dissipating section along the steel tower member to be protected to melt the snow around the member. In this case, a single long heat pipe is used, but this method has the following problems.

(1) When a large amount of snow melting heat is required, it is necessary to bury multiple heat pipes underground each time.

(2) Due to the relationship with the tower foundation, burying heat pipes after construction is a difficult task, and the amount of heat required may vary from tower to tower.

(3) Since there are various types of steel tower members, such as horizontal members, vertical members, diagonal members, etc., it is necessary to bend a single heat pipe buried underground as appropriate to fit them.

(4) If the heat pipe is damaged during use, the underground part will also be damaged, making it useless for snow melting and taking time to repair.

(5) Additional work is troublesome if there is insufficient snow melting heat.

(6) Depending on the degree of necessity, it is not possible to install heat pipes in a short period of time after the tower is constructed.

(7) If a single heat pipe is used, when the soil near the ground surface freezes in winter, much of the heat brought from underground by the heat pipe will be absorbed by the frozen soil near the ground surface. , the amount of heat dissipated in the above-ground area that requires snow melting will decrease.

(8) One heat pipe is 10m including the heat dissipation part.
This requires a longer length, making it uneconomical to manufacture and install.

[Object of the Invention] An object of the present invention is to provide an improved steel tower snow melting device that eliminates the above-mentioned drawbacks and can be efficiently constructed.

[Summary of the Invention] The gist of the present invention is to thermally connect the middle of the heat pipe through a heat storage tank filled with a heat storage material, thereby separating the heat pipe into a heat collecting part and a heat dissipating part. The purpose is to make it easier to handle.

[Example] An example of the present invention will be described below with reference to the drawings. Fig. 1 shows a case where a heat pipe is placed along the diagonal material 3 at the bottom of the steel tower to melt snow in that part. .

In the figure, the lower part of the steel tower consists of main column legs 1, horizontal members 2, diagonal members 3, and foundations 4. On the other hand, the heat pipes include a heat pipe 71 for collecting heat that is buried deep underground 5, and a heat pipe 72 for dissipating heat that is partially placed above the ground at an appropriate interval above the diagonal member 3. The heat collecting heat pipe 71 and the heat dissipating heat pipe 72 are thermally connected via a heat storage tank 73 buried near the ground surface. With such a configuration, the heat collecting heat pipe 71 and the heat storage tank 73 can be buried during construction of the steel tower, and the required number of heat dissipating heat pipes 72 can be installed later. The heat storage tank 73 is the second
As shown in the figure, a heat storage material 75 such as water or molten salt is housed in a tank whose outer peripheral surface is covered with a heat insulating material 74, and a heat radiation side portion 71A of a heat pipe 71 for heat collection and a heat radiation side portion 71A for heat radiation. The heat receiving side portion 72A of the heat pipe 72 is inserted into the tank so that the heat collected underground 5 by the heat collecting heat pipe 71 can be stored and released by the heat dissipating heat pipe 72. .
In such an arrangement, when the temperature around the lower part of the steel tower becomes lower than the temperature underground 5, the heat dissipation heat pipe 72 uses its heat transfer action to remove heat from the heat storage material 75 in the heat storage tank 73 and transfer it to the ground. heat dissipates in the area.

When the heat radiation heat pipe 72 is partially or entirely covered with snow 6, the heat emitted from the heat radiation heat pipe 72 is directly transmitted to the snow, melts the surrounding snow, and forms a snow cavity there. As the snow 6 settles and moves, the cavity is lengthened downward, and the diagonal member 3 located below the heat dissipation heat pipe 72 comes to exist within the cavity, and the snow that is added to the diagonal member 3 Eliminate or reduce the load caused by 6. Therefore, it is not necessary for the diagonal member 3 to take into account the load caused by the snowfall 6, and the cost involved can be reduced accordingly.

The number of heat collecting heat pipes 71 and heat dissipating heat pipes 72 does not need to be one to one.

FIG. 2 shows a case where the number of heat collecting heat pipes 71 is greater than the number of heat dissipating heat pipes 72. When the number of heat collecting heat pipes 71 is increased in this way, a large amount of heat can be stored, which not only compensates for the lack of heat radiation by the heat radiation heat pipes 72, but also makes it possible to add or replace the heat radiation heat pipes 72. This can be easily done if necessary. Further, as shown in FIG. 2, if a part of the heat storage tank 73 is exposed above the ground, installation, replacement, addition, etc. of the heat dissipation heat pipe 72 can be performed more easily. Of course, even when the heat storage tank 73 is completely buried underground, installation, replacement, addition, etc. are easier than when using one piece, although it depends on the depth of burial.

Although the illustrated example shows a case where the heat dissipation pipe 72 is placed along the diagonal member 3, this may be a horizontal member 2, and the number of pipes placed along the diagonal member 3 is not limited to one.
Moreover, the heat pipes 71 and 72 may be branched into a plurality of parts from the middle. Further, the location of the heat storage tank 73 is not limited to being underground, but may be above ground.

[Effects of the Invention] According to the steel tower snow melting device according to the present invention, since the heat pipe for collecting heat and the heat pipe for heat dissipation are connected via a heat storage tank, it is possible to manufacture one long piece and carry it on site. There is no need for installation processing, and even if the heat pipe for heat dissipation is damaged, it can be easily replaced. Further, according to the present invention, even if a heat pipe is not required at the beginning of construction, by burying the heat pipe underground and constructing a heat storage tank during the construction of the steel tower, it is possible to install a heat pipe for heat dissipation as necessary. It has effects such as being able to efficiently melt snow by using it, and is extremely effective in protecting steel tower members from snow damage.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the snow melting device according to the present invention, and FIG. 2 is an explanatory diagram showing the main parts of another embodiment. 1: Steel tower main column foot, 2: Horizontal member, 3: Diagonal member,
4: Foundation, 6: Snow cover, 71: Heat collection heat pipe, 72: Heat radiation heat pipe, 73: Heat storage tank.

Claims (1)

[Claims] 1. In a device that melts snow by burying one end of a heat pipe underground to collect heat and using the other end as a heat dissipation part to melt snow along a steel tower member to be protected from snow, the heat pipe has the following features: A steel tower snow melting device comprising a heat collection heat pipe and a heat radiation heat pipe that are thermally connected via a heat storage material in a heat storage tank buried near the ground surface.