JP2737827B2 - Torsion prevention damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsion-preventing damper for hard-to-wear snow attached to an overhead power transmission line.

[0002]

2. Description of the Related Art When snow adheres to an overhead transmission line, the snowflake grows gradually while sliding along the surface of the transmission line, and the rotating transmission line itself twists the transmission line. Then, the snowflakes further rotate and rapidly grow into a large snow cover, and eventually, accidents such as drooping of the transmission line, disconnection, deformation of the tower support, and collapse may occur.

[0003] Usually, in order to prevent such a snow damage accident,
Attach snow-resistant rings at predetermined intervals, and add 5
A twist prevention damper is attached every 0 m to 100 m. This torsion prevention damper increases the resistance against the twisting of the transmission line caused by snow accretion, prevents the twisting of the transmission line, and prevents the growth of snowy snow.

[0005] As shown in FIG. 5, a conventional torsion preventing damper 1 includes a clamp portion 3 for gripping a rod 2 wound around an outer periphery of a transmission line A, and both sides of a distal end portion of a clamp arm 4 extending from the clamp portion 3. And weights 5 provided on the first and second surfaces.

[0005]

However, in such a torsion prevention damper, if vibration occurs within a span (hereinafter referred to as a subspan) to which the torsion prevention damper of the transmission line is attached, the weight of the torsion prevention damper is heavy. Therefore, reflection of vibration occurs here. At this time, there is a problem in that the weight resonates, causing excessive vibration distortion in the transmission line at the point of attachment of the torsion prevention damper, and the wire is likely to break. It has been found that the cause of such a wire breakage is mainly called breeze vibration, and is caused by the amplitude of 1 mm to 30 mm at 20 Hz to 100 Hz.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems and to provide a torsion-preventing damper which can be used for a long period of time without damage to a power transmission line.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a torsion prevention device comprising: a clamp portion for gripping an electric wire; and a weight provided on a clamp arm extending from the clamp portion. in the damper, the weight and the child
A spacer that fills a gap between the two is interposed between the wire portion and the opposing wire portion , and the spacer is fixed to the wire by a fixing member.

[0008]

As described above, the torsion preventing damper of the present invention has the spacer interposed between the weight and the electric wire to fill the gap between them, and the spacer is fixed to the electric wire by the fixing member. When the transmission line vibrates, the weight does not resonate, and the torsion prevention damper itself vibrates together with the transmission line. Therefore, the clamp portion of the torsion prevention damper does not generate a large bending moment in the transmission line, and it is possible to reliably prevent the transmission line from breaking. Further, even if the torsion prevention damper vibrates, the spacer does not shift between the weight and the electric wire, so that the spacer can be prevented from falling off.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a torsion prevention damper 10 in which a rod 12 wound around a power transmission line A is clamped by a bolt or a spring and gripped, and two ends of a clamp arm 16 extending from the clamp 14 are provided. The weight 18 is provided, and a spacer 22 that fills a gap between the weight 18 and the transmission line A is interposed between the weight 18 and the transmission line A. The spacer 22 is fixed to the transmission line A by a fixing member 20.

The fixing member 20 uses a linear body made of a metal such as aluminum, copper, steel, or iron. The front end of the linear body is fixed to the spacer 22, and the rear end is spirally connected to the transmission line A. It is of a structure wound around. The shape of the fixing member 20 is not particularly limited. For example, an L-shaped jig may be used, and one end may be attached to the hole of the spacer and the other end may be attached to the transmission line A side.

As shown in FIG. 2, the spacer 22 is made of an elastic material such as rubber or plastic and has a semi-cylindrical cross section. A rod fitting groove 22a into which the rod 12 is fitted is formed in the upper part of the outer peripheral wall in the axial direction. And a weight fitting groove 22b in which the weight 18 is fitted in the inner peripheral wall.
Is formed, and a hole 24 for attaching the fixing member 20 is provided on an end surface of the spacer 22 on the fixing member side (outside).

The spacer 22 is preferably thicker than the narrowest gap between the rod 12 and the weight 18 and is preferably compressed and interposed.
The compression amount of rubber, plastic, or the like, which is the second material, is preferably about 0.5 to 3 mm when the spacer 22 is interposed between the weight 18 and the transmission line A. Also,
It is preferable to use rubber having a strength of 50 or more as the material of the spacer 22.

Next, a method of attaching the torsion prevention damper 10 will be described with reference to FIG. First, the spacers 22 are put on the weights 18 and the clamps 14 are mounted on the rods 12 by tightening bolts or springs.

Next, the distal end of the fixing member 20 is
Is fixed by inserting it into a hole 24 provided on the outer end surface of the power transmission line A in a spiral shape. The connection between the fixing member 20 and the spacer 22 may be performed in advance.

When a plurality of fixing members 20 are provided,
A plurality of holes 24 may be formed, and the tips of the fixing members 20 may be inserted into the holes 24 and fixed.

FIGS. 3 and 4 show a modification of the spacer 22. The spacer 22 is made of aluminum, copper, steel, iron or the like in a truncated pyramid shape.
Is formed continuously in the axial direction, and a tapered portion 22c is formed such that the inner peripheral wall becomes narrower from the outer end surface to the inner end surface (toward the clamp portion 14). An elastic body 26 made of rubber or the like is lined at the bottom of the base 22a, and a hole 24 for mounting the fixing member 20 is provided on an end surface of the spacer 22 on the fixing member side. The elastic body 26 such as rubber may be attached to the surface of the tapered portion 22c instead of the bottom of the rod fitting groove 22a. As described above, when the tapered portion 22c is formed on the spacer 22, the spacer 22 is attached to the existing twist prevention damper 10.
There is an advantage that mounting of the device can be easily performed.

The spacer 22 shown in FIGS.
1 and 2 may be attached in the same manner as in FIGS. 1 and 2. However, the clamp portion 14 may be attached on the rod 12 first, and then the spacer 22 may be compressed and pushed into the clamp portion 14 from outside. In this case, it is convenient to write a mark position indicating the pushing length on the spacer 22.

If the ends of the rod 12 are wound without being aligned on the same circumference, the stress is not concentrated on the end of the rod 12 even if the transmission line vibrates, and the wire break of the transmission line may occur. Can be prevented.

[0019]

As described above, in the torsion prevention damper of the present invention, the spacer is interposed between the weight and the electric wire, and the spacer is fixed to the electric wire by the fixing member. Vibrates, the weight does not resonate, and the torsion prevention damper itself vibrates with the transmission line. Therefore, a large bending moment is not generated in the transmission line by the clamp portion of the torsion prevention damper, and the strand break of the transmission line can be reliably prevented.
Further, even if the torsion prevention damper vibrates, the spacer is fixed to the electric wire, so that it is possible to prevent the spacer from being displaced and falling off. Therefore, it is possible to improve the snow-resistant effect and prevent galloping vibration, and it is possible to use the transmission line stably for a long time without damaging the transmission line.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a twist prevention damper of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an explanatory view showing another embodiment of the torsion prevention damper of the present invention.

FIG. 4 is a sectional view taken along line YY of FIG. 3;

FIG. 5 is an explanatory view showing a conventional torsion prevention damper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Torsion prevention damper 12 Rod 14 Clamp part 16 Clamp arm 18 Weight 20 Fixing member 22 Spacer 24 Hole 26 Elastic body

Claims (1)

(57) [Claims] And 1. A clamp unit for gripping the wire, the anti-twist damper comprising a weight provided on the clamp arm extending from the class <br/> pump unit, the weight and this
A torsion prevention damper characterized in that a spacer for filling a gap therebetween is interposed between an opposing electric wire portion and the spacer is fixed to the electric wire by a fixing member.