JPH0823620A - Snow damage preventing device for steel tower - Google Patents

Abstract

PURPOSE:To provide a snow damage preventing device for a steel tower which can prevent the adhesion of ice or snow lumps to the connecting sections of main pillar members, can be easily fitted to steel towers, and has a simple structure. CONSTITUTION:A steel tower constituted by assembling a plurality of main pillars composed of main pillar members connected to each other in the length direction is provided with cover members 2 which cover the connecting sections of the main pillar members and exothermic bodies 3 which are provided in the cover members 2 and heat the members 2 when they are energized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow damage prevention device for preventing accidents caused by falling of snow and ice blocks adhering to a steel tower.

[0002]

BACKGROUND OF THE INVENTION In recent years, with the rapid urbanization around power transmission lines and antennas, there has been an increase in property damage accidents caused by falling snow and ice blocks adhering to steel towers. In a steel tower constructed by assembling a main pillar 20 formed by connecting the connecting portions 21 of the main pillar member 20a as shown in FIG. 9 with a bolt, a snow pool is formed at the connecting portion 21 (see FIG. 10) of the main pillar member 20a. If it is possible, it will eventually fall into ice and snow mass 22 and an accident will occur that will damage houses and people near the tower. Especially if the tower is high, ice and snow masses are likely to form, and the range of damage caused by falling ice and snow masses will be wide.
There is an urgent need to take measures against it, and electric field technology (March 1994 issue)
As reported in the posted steel tower arm financial snow equipment, there are some that have already taken countermeasures on the arm part of the transmission line tower, but the situation is that it is difficult to take measures because the response is different for each part of the tower. Is. In particular, it is desired to develop a snow damage prevention device for a steel tower that is easy to install and effective because it cannot be recovered after an accident occurs.

[0003]

SUMMARY OF THE INVENTION The present invention has been made under the above background and prevents snow and ice blocks from adhering to the connecting portion of the main pillar members, and is easy to install and damages snow in a steel tower having a simple structure. The purpose is to provide a protection device.

[0004]

In order to achieve the above object, the snow damage preventing apparatus for a steel tower according to the present invention is a steel tower assembled by a plurality of main pillars in which main pillar members are connected in the longitudinal direction. A snow damage prevention device for preventing an accident caused by falling of snow and ice blocks attached to a connecting portion of a pillar member, the covering member covering the connecting portion of the main pillar member, and a cover member arranged on an inner side surface of the covering member and energized for covering. And a heating element for heating the member.

[0005]

According to the above construction, since the cover member covers the connecting portion of the main pillar member, no snow pool can be formed at the connecting portion. Further, since the heating element is arranged on the inner side surface of the covering member, when the heating element is energized, the covering member is warmed from the inner side surface to melt the ice and snow attached to the surface of the covering member.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a snow damage prevention device in a steel tower, and the snow damage prevention device 1 is composed of a cover member 2 and a heating element 3.

The cover member 2 is formed of a metal such as stainless steel or corrosion-resistant aluminum in a substantially conical shape, and a cylindrical holding portion 2a is formed on the upper portion thereof. The cover member 2 is vertically arranged as shown in FIG. It is divided so that it can be integrated by connecting with the connecting fitting 4.

Further, the heating element 3 is provided on the inner surface of the cover member 2.
Is fixed by a locking member 8, and a power cable 9 for power supply and a power plug 10 are connected to one end of the heating element 3.

As shown in FIG. 3, the connecting metal member 4 has a hook 5 of the metal member 4b attached to one cover member 2 and a band 6 of the metal member 4a attached to the other cover member 2 and the lever 5 It is provided so that the cover member 2 is connected by inclining 7.

The connecting member 4 is not limited to the above-mentioned connecting fitting 4 for connecting the covering member 2 divided into two parts, and the holding portion 2a is fixed to the main pillar member 5a with a stainless band (not shown). I don't mind.

As shown in FIG. 4A, the locking member 8 is formed with a pair of inverted U-shaped locking pieces 8a, and a screw hole 8b for screwing the cover member 2 is formed. There is.
The locking member 8 may be fixed to the cover member 2 by welding. The locking piece 8a is provided so as to fix the heating element by bending (see FIG. 4 (b)).

As the heating element 3, for example, KEM-1 or KEM-2 of Kaken Co., Ltd., which is a self-temperature control type, may be used. This heating element 3 has two conductors 1 as shown in FIG.
1, a heating resistor 12 made of a mixture of a radiation-crosslinked polymer and conductive carbon continuously forms a parallel circuit, an insulating coating 13 made of fluororesin is provided, and a tin-plated copper braid 14 is provided and made of polyolefin. The outer insulation coating 15 is applied, and the radiation cross-linked polymer expands and contracts depending on the ambient temperature to change the bond density of the conductive carbon and increase or decrease the resistance value to control the heat output. .

As shown in FIG. 2, the heating element 3 is fixed to the inner surface of the cover member 2 by a locking member 8 so that the cover member 2 is heated from the inside to about 65 to 70 degrees by being energized. It is provided.

As shown in FIG. 6, the snow damage prevention apparatus 1 having the above-described structure has the cover member 2 sandwiched between the main pillar members 20a from both sides and connected by the connecting fittings 4 so as to cover the connecting portion 21 of the steel tower. Attach. Since the covering member 2 is formed in accordance with the thickness of the main pillar member 20, it can be easily attached and fixed to the main pillar member 20 simply by connecting with the connecting fitting 4. Then, the power plug 10 is inserted into an outlet in a power distribution box (not shown) installed near the snow damage prevention device 1. The power cable of this distribution box is routed to the bottom of the tower and connected to the power source via a switch. As the power source, single-phase 200V or single-phase 100V may be used. In the case of a power transmission line tower, one that receives power from a general high-voltage distribution line at an AC three-phase three-wire system of 6.6 KV and is stepped down to a single-phase 200 V or a single-phase 100 V via an insulating transformer may be used.

It is also possible to lay a connecting cable for each main pillar 20, connect each snow damage prevention device 1 to this connecting cable in parallel, and connect this connecting cable to a power source.

Instead of using the power plug 10, a crimp terminal may be attached to the power cable 9 and screwed to the power terminal in the distribution box.

When the snowfall prediction is large, the manager circulates and turns on the switch to energize the heating element 3 to heat the covering member 2. Even if the snow falls and the snow adheres to the connecting portion 21 of the main pillar member 20a, since the covering member 2 covers the connecting portion 21 like a shade (see FIG. 6), the snow adheres to the connecting portion 21. Can be prevented. Further, since the side surface of the cover member 2 is inclined, the snow slides down and is unlikely to adhere, but since it is heated by the heating element 3, the snow is not melted at the same time as the adherence to form an ice snow mass.

Next, FIG. 7 shows a case where a temperature sensor 25 for detecting the temperature of the cover member 2 is provided. Cover member 2
When the temperature becomes lower than the predetermined temperature, the temperature sensor 25 operates to turn on the timer circuit 26. Timer circuit 26
Output is amplified by amplifier 27 and activates relay 28,
The heating element 3 is provided so as to be energized to heat the covering member 2. When a certain time has passed, the timer circuit 26 becomes O
It becomes FF and the power supply to the heating element 3 is stopped. If the temperature of the cover member 2 is higher than a predetermined temperature, the energization is stopped as it is, but if the temperature is low, the timer circuit 26 is turned on again.
Then, the heating element 3 is continuously energized to overheat the covering member 2 to melt the snow and prevent the snow from adhering.

As a result, the snow damage prevention device 1 can be operated without human labor, and it is economically effective because there is no need to energize before snow and ice blocks form.

Further, FIG. 8 is provided with a wireless remote operation device, and the administrator transmits an operation signal from the transmitter 29 when the snowfall prediction is large. Upon receiving the activation signal, the receiver 30 outputs the activation signal to the control device 31. The control device 31 can activate the relay 28 to energize the heating element 3. Further, since the administrator can stop the supply of electric power to the heating element 3 by transmitting the release signal, the snow damage prevention device 1 can be controlled based on the snow accretion prediction, so that it can be economically operated.

[0021]

According to the present invention, the structure is simple and the main pillar member can be easily attached. Further, since the cover member covers the connecting portion, snow does not adhere to the connecting portion. Furthermore, since the heating element is attached to the inner surface of the covering member, the covering member is heated by energizing the heating element,
Since the surface of the covering member is prevented from freezing and forming snow and ice blocks, the ice and snow blocks formed at the connection of the main pillar members of the steel tower may fall and cause damage to houses and people under the steel tower. Can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a snow damage prevention device.

FIG. 2 is a perspective view showing a state in which the snow damage prevention device is divided.

FIG. 3 is an explanatory view of a structure and an operation mode of a connecting fitting.

4A and 4B are explanatory views showing a structure of a locking member and a state when the heating element is locked.

FIG. 5 is a partially cut explanatory view showing a structure of a heating element.

FIG. 6 is an explanatory view of a state in which the snow damage prevention device is attached to the main pillar member.

FIG. 7 is a block diagram showing another embodiment of the snow damage prevention device.

FIG. 8 is a block diagram showing still another embodiment of the snow damage prevention device.

FIG. 9 is an explanatory view showing the structure of the steel tower and showing a falling state of the ice and snow mass formed at the connecting portion.

FIG. 10 is a perspective view showing a shape of a connecting portion of a main pillar member.

[Explanation of symbols]

 1 Snow damage prevention device in steel tower 2 Cover member 3 Heating element 20 Main column 20a Main column member 21 Connection part

Claims (1)

[Claims] 1. A snow damage prevention device for a steel tower assembled from a plurality of main pillars which are formed by connecting main pillar members in the longitudinal direction, and which prevents accidents due to falling of snow and ice blocks adhering to the connecting portions of the main pillar members. An apparatus for preventing snow damage in a steel tower, comprising: a cover member that covers the connecting portion of the main pillar member; and a heating element that is disposed on the inner side surface of the cover member and that heats the cover member by applying electricity.