JPH0652019B2 - Steel tower snow melting equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a snow melting apparatus for protecting steel towers such as steel towers for power transmission lines and steel towers for ski lifts constructed in a snowfall area from snow damage, and in particular heat of the ground. The present invention relates to a steel tower snow melting device using a heat pipe.

[Prior art and its problems] For example, in order to protect a power transmission line that passes through a mountainous area from snow damage, heat pipes are laid on the arms and legs of the steel tower that supports the power transmission line to keep the heat from underground. Attempts have been made to prevent the use of snow on the member or reduce the snow pressure on the member by utilizing this.

That method, one end side of the heat pipe is buried in the soil of the lower part of the tower as a heat collecting part, the other end side is added to the member as a heat radiating part, and the phase of the working fluid enclosed in the heat pipe is set. By utilizing the change, the heat in the ground is used for snow melting near the member. In this case, the heat pipe must be bent according to the position, length, etc. of the applied member, but there is a possibility of buckling due to the bending,
A special jig is required for processing, and the work is troublesome.

In addition, since there is no protection after laying,
Parts exposed on the ground may be injured during maintenance and other occasions.

The heat pipe works effectively when it is buried in snow, but when the upper part is exposed to abnormal cold wind snow, the snow melting effect decreases, and the heat pressure also acts on the heat pipe. However, the heat pipe may be deformed or damaged.

[Object of the Invention] The present invention has been made in view of the above points, and an object thereof is to provide a snow melting device capable of improving the workability of installation and protection of external damage.

[Summary of the Invention] The gist of the present invention is to add a plurality of metal wires to at least a part of the exposed portion of the heat pipe on the ground portion, and to attach the portion to which the metal wires are attached to the heat pipe. There is a twisted wire structure.

[Examples of the Invention] Hereinafter, the snow melting apparatus of the present invention will be described with reference to the drawings.
FIG. 1 shows an example in which the heat pipes 5 are laid on the legs of a transmission line tower, but the present invention can also be implemented in the case of laying on the upper arm.

The steel tower legs are main pillar 1, reinforcing members 21, 22, 23, foundation 3
And the like, and the other end side of the heat pipe 5 having one end side buried in the soil 4 in the vicinity of the foundation 3 to a predetermined length as a heat collecting part is laid in a bent shape as a heat radiating part. ing. In this case, the fixtures 7 having a heat insulating function are interposed between the reinforcing members 21, 22, 23 and the heat pipe 5 at appropriate intervals so that heat in the ground does not dissipate through the members 21, 22, 23. It has become. As shown in FIG. 2, on the outer periphery of the above-ground portion of the heat pipe 5, a plurality of metal wires 6 thinner than the heat pipe 5, such as an aluminum wire and an aluminum alloy wire, are provided. Steel wire, aluminum covered wire, etc. are spirally adhered and wound at a predetermined pitch,
The said part has the structure of the stranded wire which made the heat pipe 5 a part of strand. The metal wire 6 may be wound around the heat pipe 5 in advance, or may be attached when the heat pipe 5 is laid.

The mounting portion of the metal wire 6 may be continuous without interruption,
It may be applied over the entire length.

In the case of the heat pipe 5 having such a composite structure, a plurality of metal wires 6 are attached to the heat pipe 5 during bending during installation.
Since a force in the centripetal direction acts on the heat pipe 5, excessive deformation is prevented, the heat pipe 5 does not buckle even with a small bending radius, and it is possible to easily bend the heat pipe 5 by helping the bendability of the stranded wire structure. You can

By the way, regarding the heat pipe using a copper tube as a container,
When we investigated the bending radius and the presence or absence of buckling using aluminum wire as the metal wire, the one without metal wire required a special jig for the bending radius of 20 times or less of the heat pipe diameter. In the case where the metal wire according to the present invention was used, even if the bending radius was 10 times the diameter of the heat pipe, bending could be easily performed without buckling without using a special jig.

In the arrangement structure shown in FIG. 1, when the temperature around the steel tower becomes lower than the temperature in the soil 4, the heat pipe 5 is heated by the heat transfer action accompanying the phase change of the working fluid such as Freon ammonia enclosed inside. , Take heat from the soil 4 at the heat collecting part,
This is transported to the ground and radiates heat. Therefore, even if there is snow at this time and the legs of the tower are covered with snow, the heat pipe 5
Since the heat is continuously dissipated on the ground, the snow around the heat pipe 5 on the ground is melted and a hollow cavity is formed around the heat pipe 5. The cavity is enlarged to reduce the load of snow on the members 21, 22, 23. During this time, if there is snowfall from the tower, or if the tip side of the heat pipe 5 is exposed and exposed to abnormal cold wind snow, there is a possibility that the heat pipe 5 will have a large effect. Since the metal wire 6 is appropriately added to the portion, the metal wire 6 shares the stress and prevents the heat pipe 5 from being deformed or damaged. It goes without saying that the metal wire 6 also protects the heat pipe 5 against external damage caused by construction, maintenance and inspection.

FIG. 3 shows a cross section of another example of the combination of the heat pipe 5 and the metal wire 6. The heat pipe 5 is arranged not on the central portion but on the surface layer side. Incidentally, FIG. 3 (b) shows a case where the heat pipes 5 are plural in number.

The metal wire 6 may have a diameter similar to that of the heat pipe 5 as in this example, or may have a small diameter as in the example of FIG. Of course, it does not matter if the diameter of the heat pipe 5 is larger than that of the heat pipe 5. When the metal wire 6 is hard, it is possible to provide appropriate flexibility by using a wire having a small diameter.

EFFECTS OF THE INVENTION According to the present invention, since a plurality of metal wires are added to a part of the exposed portion on the ground, and the portion has a twisted wire structure, damage due to bending during installation is achieved. The heat pipe after installation can be protected from external force, and the heat in the ground can be effectively used for snow damage protection of the steel tower.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the snow melting apparatus according to the present invention, FIG. 2 is a sectional view of a heat pipe in the embodiment, and FIGS. 3 (a) and 3 (b) are different examples. 3 is a cross-sectional view of the heat pipe in FIG. 1: Main columns, 21, 22 and 23: Reinforcing member, 3: Foundation, 4: Soil, 5: Heat pipe, 6: Metal wire.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Kiyoshi Shimojima 3550 Kitayo-cho, Tsuchiura-shi, Ibaraki Hitachi Cable Ltd. (72) Inventor Yuji Karashi 3550 Kidayo-cho, Tsuchiura-shi, Ibaraki Hitachi Cable Shares Inside the Metal Research Laboratory (72) Inventor Kenichi Kikuchi 3550 Kidayocho, Tsuchiura City, Ibaraki Prefecture Hitachi Cable Ltd. Metal Research Laboratory

Claims (1)

[Claims] 1. A device for melting snow by burying one end of a heat pipe in the ground and putting the other end of the heat pipe along with a steel tower member to be protected from snow, in a portion of the heat pipe exposed at least above ground. A steel tower snow melting apparatus, wherein a plurality of metal wires are added to a part, and the part to which the metal wires are added has a stranded wire structure in which the heat pipe is part of the strand.