JPH05292635A - Fixing matel of wire to steel tower - Google Patents

Abstract

PURPOSE:To provide a fixing metal of wires to a steel tower in which wire grip force can be increased without increasing the type of insert rubbers or armor rods. CONSTITUTION:In a fixing metal for fixing a wire to a steel tower by winding an armor rod 13 around a wire 10 at a point to be fixed to the steel tower and then clamping accessories to the outer periphery of the armor rod 13, wedge type fillers 11, 12 are previously applied on the outer periphery of the wire 10 at a point where the armor rod 13 is wound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting device used for mounting an electric wire on a power transmission tower.

[0002]

2. Description of the Related Art Suspension clamps are often used to attach overhead power lines to power transmission towers.

FIG. 4 is an external view of a conventional suspension clamp of this type, and FIG. 5 is a sectional view of the suspension clamp shown in FIG. 4 before the main body and the body retainer are attached.

In FIGS. 4 and 5, a plurality of armor rods 2 are twisted and wound around the outer circumference of an electric wire 1 for an overhead power transmission line to be attached to a steel tower, and the armor rod 2 is wound from the outer side to the inner side on the outer circumference of the armor rod 2. An insert rubber 3 is attached for pressing in the same direction. An armor rod 4 is wound around the outside of the armor rod 2 and the insert rubber 3 so as to cover the armor rod 2 and the insert rubber 3. A main body 5 is attached to the center of the armor rod 4, and a body retainer 6 for retaining the main body 5 is attached to the main body 5. A mounting hole 7 for mounting on the steel tower is formed in the upper portion of the body retainer 6.

In such a suspension clamp, a frictional force between the electric wire 1 and the armor rods 2 and 4 and a compressive force applied to the armor rod 2 by the insert rubber 3 hold the electric wire 1 in the longitudinal direction. Is becoming

By the way, it is generally required that the suspension clamp have a holding force of 60% or more of the maximum usable tension of the electric wire as a gripping force against the non-uniform tension applied in the longitudinal direction of the electric wire when suspending the electric wire 1. In order to obtain such a gripping force, the armor rods 2 and 4 and the insert rubber 3 according to the diameter and size of the electric wire to be used and the suspension clamp are required.
However, the diameter and size of the electric wire are varied to define the dimensions of the armor rod 2 and the external dimensions of the insert rubber 3 for the purpose of limiting manufacturing cost and product quantity.

Therefore, when the electric wire 1 is hung on a steel tower by using a certain suspension clamp, if the electric wire 1 having the smallest diameter among the variations is used, the gap between the electric wire 1 and the suspension clamp becomes large. It may not be possible to secure a gripping force of 60% or more of the maximum use tension required for the gripping force.

In order to prevent such a situation, it is possible to provide a variation in which the gap between the electric wire 1 and the suspension clamp has a negative tolerance.

[0009]

However, when OPGW (optical fiber composite overhead ground wire) is clamped on a steel tower as an electric wire, depending on how the negative tolerance is selected,
Since the PGW may be crushed by the tightening force of the suspension clamp, the diameter range of the electric wire that can be clamped by the suspension clamp is narrowed, and as a result, the types of insert rubber and armor rod are increased, and the work efficiency is reduced. However, there is a problem that the cost becomes high.

Therefore, an object of the present invention is to solve the above problems and to provide a device for mounting an electric wire on a steel tower that can increase the gripping force of the electric wire without increasing the types of insert rubber and armor rod. It is in.

[0011]

In order to achieve the above object, the present invention is to wind an armor rod around the outer circumference of an electric wire to be attached to a steel tower, and to attach the attachment accessory to the outer circumference of the armor rod to attach it to the steel tower. In a device for attaching an electric wire to a steel tower, a wedge-shaped inclusion is preliminarily attached to the outer circumference of the electric wire around a position where the armor rod is wound.

[0012]

According to the above construction, since a wedge-shaped inclusion is previously attached to the outer circumference of the electric wire around the armor rod, even if there is a gap due to the difference in diameter between the electric wire and the mounting accessory, the electric wire When the wire is pulled in the longitudinal direction, the gripping force of the inclusions increases to prevent the wire from moving in the longitudinal direction. Therefore, the electric wire can be mounted on the steel tower with a small number of types of attachment accessories without increasing the types of attachment accessories such as the insert rubber and the armor rod as in the conventional case.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a sectional view of an armor rod grip type suspension clamp, which is an example of an apparatus for attaching an electric wire to a steel tower according to the present invention, before a main body and a body retainer are attached.

In the figure, a pair of substantially conical wedge-shaped inclusions 11 and 12 are mounted facing each other on an electric wire 10 for an overhead power transmission line to be attached to a steel tower.
A plurality of armor rods 13 are provided on the outer circumference of the wire 12 and the electric wire 10.
Is wrapped around. On the outer periphery of the armor rod 13, inserts 14 for mounting the inclusions 11 and 12 and the armor rod 13 evenly from the outside are attached. Note that it is preferable to use elastic heat-resistant rubber for the inclusion so that the gripping force is evenly applied to avoid local stress concentration on the electric wire. Further, a plurality of protrusions may be provided on the surface to increase the friction coefficient of inclusions.

An armor rod 4 is wound around the outer sides of the armor rod 13 and the insert rubber 14 so as to cover the armor rod 13 and the insert rubber 14, as in the above-mentioned conventional example. A main body 5 is attached to the center of the armor rod 4, and a body retainer 6 for retaining the main body 5 is attached to the main body 5. A mounting hole 7 for mounting on a steel tower is formed in the upper portion of the body retainer 6 (FIGS. 4 and 5).

The insert rubber 14 and the armor rod 4 constitute a mounting accessory.

Next, the operation of the embodiment will be described.

Since a pair of substantially conical wedge-shaped inclusions 11 and 12 are previously mounted between the electric wire 10 and the suspension clamp so as to face each other, a difference in diameter between the electric wire 10 and the attachment accessory. Even if there is a gap due to the inclusion, when the electric wire 10 is pulled in the direction of the arrow A, the side wall of the inclusion (the right side in the drawing) 11 tries to bite into the insert rubber 14 via the armor rod 13, so that the inclusion When the electric wire 11 restrains the electric wire 10 and the electric wire 10 is pulled in the direction of the arrow B, the side wall of the inclusion 12 (the left side in the drawing) tries to bite into the insert rubber 14 via the armor rod 13, so that the inclusion 12 binds the electric wire 10. As a result, the pulling of the electric wire 10 increases the compressive force of the inclusions 11, 12 and prevents the electric wire 10 from moving in the longitudinal direction.

As described above, in this embodiment, since the wedge-shaped inclusions 11 and 12 are preliminarily attached to the outer periphery of the electric wire 10 around which the armor rod 4 is wound, the gap between the electric wire 10 and the mounting accessory is eliminated. Even if there is, when the electric wire 10 is pulled in the longitudinal direction, the gripping force of the inclusions 11 and 12 increases to prevent the electric wire 10 from moving in the longitudinal direction. Therefore, the electric wire 10 can be attached to the steel tower with a small number of types of attachment accessories without increasing the types of attachment accessories such as the insert rubber 14 and the armor rod 13 as in the conventional case.

The electric wire 10 can be gripped by providing the inclusions 11 and 12 for each diameter of the electric wire 10 with other mounting accessories shared, and the number of parts to be held can be limited. .. Further, by inserting the inclusions 11 and 12 between the armor rod 13 and the insert rubber 14, the tightening force by the inclusions 11 and 12 may be improved while maintaining the gripping force of the armor rod 13 itself.

Although the armor grip type suspension clamp has been described in this embodiment, the present invention can be applied to a free center type suspension clamp or a bolt type tension clamp.

FIG. 2 is a sectional view of the free center type suspension clamp, and FIG. 3 is a side view of the bolt type tension clamp.

As shown in FIG. 2, in the free center type suspension clamp, an electric wire groove is formed in a suspension clamp body 20 made of, for example, malleable cast iron or aluminum alloy, and an electric wire 22 in which an armor rod 21 is wound around the electric wire groove. A movable shaft is provided at the center of the two bolts 23a, 2
3b, nuts 24a and 24b, and a keeper 25, which is a clamp connected in a suspended manner by a link.

As shown in FIG. 3, the bolt-type tension clamp is a clamp for fixing an overhead ground wire, and includes several clamps (bolts 31a, 31b) on a clamp body 30 made of malleable cast iron or aluminum alloy, for example. , 31c and nut 32
a, 32b, 32c), the electric wire 34 around which the armor rod 33 is wound is pressed down by the pressing plates 35a, 35b, 35c.
It is a clamp that tightens and holds through.

The gripping force can be increased by inserting an inclusion into the end of the base of each of these clamps.
Further, it is expected that the length of the grip portion will be shortened, and as a result, the size of the clamp can be reduced.

[0027]

In summary, according to the present invention, an electric wire attachment device for attaching an electric wire to a steel tower by winding an armor rod around the electric wire at a location to be attached to a steel tower and clamping an attachment accessory on the outer periphery of the armor rod to attach the electric wire to the steel tower. In the above, since a wedge-shaped inclusion was previously attached to the outer circumference of the electric wire around the armor rod, it is possible to increase the gripping force of the electric wire without increasing the types of insert rubber and armor rod. An attachment device can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an armor rod grip type suspension clamp before mounting a main body and a body retainer, which is an embodiment of a device for mounting an electric wire on a steel tower according to the present invention.

FIG. 2 is a cross-sectional view of a free center suspension clamp.

FIG. 3 is a side view of a bolt type tension clamp.

FIG. 4 is an external view of a conventional suspension clamp.

5 is a sectional view of the suspension clamp shown in FIG. 4 before the main body and the body retainer are attached.

[Explanation of symbols]

 4, 13, 21 Armor rod 5 Main body 6 Body retainer 10, 22, Electric wire 11, 12 Inclusion 14 Insert rubber

Claims (1)

[Claims] 1. An apparatus for attaching an electric wire to a steel tower, wherein an armor rod is wound around an outer circumference of an electric wire to be attached to a steel tower, and an attachment accessory is clamped around the outer circumference of the armor rod to attach the electric wire to the steel tower. A device for attaching an electric wire to a steel tower, wherein a wedge-shaped inclusion is preliminarily attached to the outer circumference of the electric wire.