JPH0226031B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for preventing the accumulation of ice and snow on steel towers.

[Prior art and its problems]

When ice and snow occur on a steel tower used for an overhead power transmission line, etc., it may fall in clumps and cause damage to facilities under the tower, such as vinyl greenhouses. For this reason, it is necessary to prevent ice and snow from accreting on the steel tower.
It is necessary to prevent the ice and snow that forms on the steel towers from clumping together and falling to the ground.

Conventionally, as a method to prevent ice and snow from accreting on steel towers,
There is a method of melting ice and snow by placing a heater wire along the steel tower member and heating the heater wire with electricity.

However, this method has the disadvantage that the heat from the heater wires is not sufficiently transmitted to the steel tower members, and can only melt ice and snow near the heater wires.Also, due to poor thermal efficiency, a large amount of electricity is required to heat the heater wires. There were problems such as.

In addition, as a method of preventing the ice and snow that has formed on the tower from forming lumps and falling to the ground, there is a method of attaching a net to the lower part of the tower arm and using this net to catch the ice and snow.

However, with this method, installing the net is extremely troublesome, and installing the net increases the weight and wind pressure of the tower, requiring reinforcement of the tower.Furthermore, the installation position of the net is restricted and the appearance is poor. There are other problems.

[Means for solving problems and their effects]

The present invention was made in order to solve the problems of the prior art as described above, and consists of configuring at least a part of a steel tower as part of an electric circuit, and energizing the steel tower member that constitutes the electric circuit. It generates heat itself, thereby preventing ice and snow from accreting on the steel tower.

By generating heat in the steel tower itself in this way, there is no need for heater wires or mesh, and it is possible to efficiently and easily prevent ice and snow from accumulating on the steel tower.

〔Example〕

FIG. 1 shows an embodiment of the method for preventing icing and snow on a steel tower according to the present invention.

Reference numeral 1 denotes a steel tower, which is composed of a base 11, a lower arm 12, a middle arm 13, an upper arm 14, a top 15, and the like. Four power supplies 2a, 2b, 2c, and 2d are provided between the four posts 11a, 11b, 11c, and 11d of the tower base 11, respectively. These power supplies 2a, 2b, 2c, 2d are connected to posts 11a,
11b, 11c, and 11d, respectively. That is, the first power source 2a is the feeder line 3
a to the posts 11d and 11a, and the second power supply 2b connects the posts 11a and 11b to the posts 11a and 11b by the feeder line 3b.
, the third power supply 2c is connected to the posts 11b and 11c by a power supply line 3c, and the fourth power supply 2d is connected to the posts 11b and 11c by a power supply line 3d.
are electrically connected to posts 11c and 11d, respectively.

If such an electric circuit is constructed and current is passed through each part of the steel tower, the tower will generate heat due to Joule heat, which will efficiently melt ice and snow.

Steel towers are generally made of steel, and the electrical resistance from the bottom to the top is less than 0.1Ω, which is sufficiently small compared to the grounding resistance, so most of the current flows through the tower and contributes to heat generation. In addition, since the resistance of the steel tower is low, a low-voltage, high-current power source is suitable, and the power supply voltage only needs to be a few volts, so
There is little danger. Note that the power source is not limited to alternating current, and may be direct current.

FIG. 2 shows another embodiment of the invention. In this embodiment, two feeder lines 3a and 3b with power sources 2a and 2b in the middle are stretched in the vertical direction of the steel tower 1, and three branch lines 3e are connected to each feeder line 3a and 3b, respectively. has been done. One power supply line 3a is
The lower ends of the posts 11a and 11b of the tower base 11
The other feeder line 3b has its lower end connected to the posts 11c and 11d of the tower base 11, and its upper end to the tower top 15. Further, three branch lines 3e extending from each power supply line 3a, 3b are connected to the tips of the lower arm 12, middle arm 13, and upper arm 14, respectively.

Assuming that a current flows in the direction of arrow A from the power source 2a, the current flows through each arm 12, 13,
14 and the top of the steel tower 15, and the post 11a,
11b. Also power supply 2b
The same applies to the current flowing due to the current.

In this way, by connecting the top and bottom of the tower with a power supply line, and connecting the branch lines extending from the power supply line to the ends of each arm, and applying current, the current will flow approximately evenly to each part of the tower.

FIG. 3 shows yet another embodiment of the invention. In this embodiment, the steel tower 1 is arranged in the height direction with a base 11 and
Lower arm 12, middle arm 13, and upper arm 14
and a top portion 15, each of which is provided with a power source 2a, 2b, 2c, and 2d so as to be individually energized.

That is, the first power supply 2 is connected to the tower base 11.
A is provided, and the feeder line 3a extending from there is connected to the post 1.
1a, 11b, 11c, and 11d and are connected to the base of the lower arm 12 to form a first electric circuit, and a second power source 2b is provided for the lower arm 12, and a power supply line extends from there. 3b is connected to the tip of the lower arm 12 and the base of the middle arm 13 to form a second electric circuit, and a third power supply 2c is provided for the middle arm 13, and a power supply line 3c extending from there is connected. The tip of the middle arm 13,
A third electric circuit is constructed by connecting the bases of the upper arms 14 to each other, and furthermore, a fourth power supply 2d is provided to the upper arm 14 and the top 15, and a power supply line 3d extending from there is connected to the tip of the upper arm 14. , are connected to the tower top 15 to form a fourth electric circuit.

At the base of a steel tower, the steel material is thick, so the electrical resistance is low, but as you get to the top, the steel material becomes thinner, so the electrical resistance increases. Therefore, if a steel tower is divided into multiple parts in the height direction as described above, and a power supply is installed in each of them and energized individually, the voltage and current of each power supply can be adjusted, thereby reducing the heat generated in each part of the tower. can be adjusted appropriately.

Although the above embodiment shows the case where the entire steel tower generates heat, it may be configured such that only a part of the steel tower, for example, each arm and the top where icing and snow is likely to occur, generates heat. Further, the position where the power supply line is connected to the steel tower is not limited to that in the embodiment, and it is sufficient that a part of the steel tower constitutes a part of the electric circuit.

〔Effect of the invention〕

As explained above, the present invention makes at least a part of the steel tower a part of the electric circuit, and the steel tower itself generates heat when energized. Therefore, it is possible to efficiently prevent ice and snow from accumulating on the steel tower. It can reliably prevent large ice and snow blocks from falling. Furthermore, in the present invention, it is only necessary to connect the power supply line to the steel tower and energize it, so it is easier to implement than the conventional method of using a heater wire or method of using a net. Furthermore, it consumes less power, is economical, and does not look bad.

[Brief explanation of drawings]

1 to 3 are perspective views each showing an embodiment of the method for preventing ice and snow on a steel tower according to the present invention. 1 ~ Steel tower, 2a, 2b, 2c, 2d ~ Power supply, 3
a, 3b, 3c, 3d - power supply line, 3e - branch line.

Claims (1)

[Scope of Claims] 1. A method for preventing icing and snow on a steel tower, characterized in that at least a part of the steel tower is configured as part of an electric circuit, and the steel tower members forming the electric circuit are energized to generate heat themselves. . 2. The method according to claim 1, comprising:
The feature is that the steel tower is divided into multiple sections in the height direction, each of which is provided with a power source and energized individually.