JPH0322444Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a device for melting snow on branch lines supporting utility poles.

PRIOR ART It is well known that among the supports of power transmission lines, wooden poles and concrete poles are provided with branch wires to provide reinforcement against wind pressure loads, horizontal loads, and the like. The branch line is usually a stranded wire made by twisting together three or more mild steel wires with a diameter of about 4 mm, and is strung diagonally between the utility pole and the underground anchor. Since this branch line is placed in the natural environment along with the power transmission line, the number of twists and the diameter of the strands are determined and constructed with consideration to environmental changes.
Since the branch lines are made of solid wire, abnormalities may occur in cold regions or in unexpected environments. In other words, if a branch line is buried in snow due to a large amount of snow, or if it is subjected to a large wind pressure load with a large amount of ice and snow, the load will become extremely large and the branch line may break or the utility pole may become damaged. Accidents such as falling may occur.

Conventionally, as a device to prevent such accidents, a device that uses geothermal heat to melt snow was developed in 1986-152756.
It is proposed by No. This device brings one end of the heat pipe into contact with a branch line, and
The other end of the line is inserted into the ground, and the heat pipe is used to transport geothermal heat around the branch line to melt snow.

Problems that the invention aims to solve: With the conventional device described above, the amount of snowfall differs depending on the area where the wooden pole or concrete pole is installed, so the length of the heat pipe attached to the branch line is adjusted according to the amount of snowfall. is set.

However, when more snow falls than expected, the heat pipe becomes completely buried in the snow, and the snow above the heat pipe is not melted by the heat carried by the heat pipe, and the load of the snow is transferred to the branch line. There was a problem that the branch line was disconnected.

Therefore, if the length of the heat pipe attached to the branch line is set to be longer than the amount of snow that is normally expected, it is possible to reliably prevent the accident of cutting the branch line due to snow accumulation. Setting the length of the pipe is wasteful, and the resulting cost increase cannot be ignored.

The purpose of this invention is to solve the above-mentioned problems and provide a snow melting device for utility pole branch lines that can completely prevent branch line breakage accidents even when unexpected snowfall occurs.

Means for solving the problem This invention has the same effect as when the length of the upper end of the heat pipe is substantially extended by fixing a pipe member along the branch line to the upper end of the heat pipe. I'm trying to get that.

In other words, the upper end of the heat pipe is fixed along a branch wire strung diagonally between a utility pole and an underground anchor, and the lower end of the heat pipe is fixed along a branch line that is diagonally stretched between a utility pole and an underground anchor. In a snow melting device for a utility pole branch line that is inserted into a high heat collecting section, a pipe member made of a material with good thermal conductivity is opened at the lower end and closed at the upper end, and the heat pipe is inserted into the opening at the lower end. It is characterized in that a portion of the upper end side is inserted and fixed along the branch line.

Effect When snow falls to the position of the pipe member, although the temperature inside the upper end of the pipe member is lower due to the snow, the temperature inside the opening at the lower end of the pipe member is carried from underground by the heat pipe. The resulting heat increases the temperature, creating a temperature difference between the upper and lower ends of the pipe member, and this temperature difference causes natural convection of air. In other words, the air inside the opening at the bottom end, which has been heated and lightened by the heat carried from the heat pipe, rises, while the air inside the top end, which has become heavier due to cooling due to snowfall, descends, causing the air to become lighter. Convection occurs, and during this convection process, heat is transferred to the entire circumferential surface of the pipe member.

Therefore, the snow around the heat pipe is melted by the heat carried by the heat pipe, and the snow above the heat pipe, that is, the snow around the pipe member, is melted by the heat carried by the heat pipe. The pipe member is melted by the heat transferred all around it.

Embodiments Hereinafter, embodiments of this invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing an embodiment of this invention, in which a branch line 2 for reinforcing a utility pole 1 has one end fixed to the utility pole 1 and the other end attached to an underground anchor 3. By fixing it, it is stretched diagonally to the utility pole 1. This branch line 2 is made of twisted mild steel wires, for example, and a heat pipe 4 is attached and tightly fixed to the lower part from approximately the middle part of the branch line 2, and the lower end of the heat pipe 4 is connected to the underground temperature. It is inserted up to the relatively high heat collecting part 5. Here, the heat pipe 4 has a structure in which only a condensable fluid is substantially sealed as a working fluid, and the length of the upper end side along the branch line 2 is based on the assumption of a normal snowfall amount. is set.

A pipe member 6 made of a material with good thermal conductivity, such as aluminum or copper, is attached and tightly fixed to the upper to middle portion of the branch line 2 . The inner diameter of this pipe member 6 is set larger than the outer diameter of the heat pipe 4, the upper end portion of the heat pipe 4 is inserted into the opening 6a at the lower end, and the upper end 6b is closed to prevent snow from entering. The heat carried from the heat pipe 4 causes natural convection inside the pipe member 6.

In the above embodiment, since the temperature on the ground side becomes lower than the temperature of the underground heat collecting part 5 during snowfall, the lower part of the heat pipe 4 located in the heat collecting part 5 becomes the heating part, and the lower part of the heat pipe 4 located along the branch line 2 The upper end side, which is located at Geothermal heat will be transported to the ground side to melt the snow around branch line 2. Also, at this time, as shown in Figure 2,
The air inside the opening 6a at the lower end of the pipe member 6 is heated by the geothermal heat carried to the ground side by the heat pipe 4, becomes lighter, and rises to the upper end 6b of the pipe member 6. The cooled and heavier air in the upper end 6b descends to the lower end, and the rising and falling of this air is repeated to generate natural convection, and in the process of this natural convection, heat is transferred to the entire circumferential surface of the pipe member 6. The heat is transferred and melts the snow around the branch line 2 as well.

Effects of the invention As explained above, according to this invention, even if there is more snow than expected, natural convection of air occurs inside the pipe member installed at the upper end of the heat pipe and melts the snow. In addition to being able to reliably prevent branch line breakage accidents due to heavy snow, there is no need to set the heat pipes long enough to accommodate heavy snow that rarely occurs, so there is no waste and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of this invention, and FIG. 2 is an explanatory diagram for explaining natural convection of air within a pipe member. 1... Utility pole, 2... Branch line, 4... Heat pipe, 5... Heat collection section, 6... Pipe body, 6a...
Opening at the lower end, 6b...upper end.

Claims (1)

[Claim for Utility Model Registration] The upper end of the heat pipe is fixed along a branch wire stretched diagonally between a telephone pole and an underground anchor, and the lower end of the heat pipe is In a snow melting device for a utility pole branch line that is inserted into a high-temperature heat collecting section underground, a pipe member made of a material with good thermal conductivity is opened at the lower end and closed at the upper end, and the pipe member is made of a material with good thermal conductivity and is A snow melting device for a utility pole branch line, characterized in that a portion of the upper end side of the heat pipe is inserted into the section and fixed along the branch line.