RU2530753C1 - Spiral tension clamp - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: spiral tension clamp comprises outside strand 1 and inner strand 2 of coiled wires made of wire with different coiling direction. Each of the coiled wire strands 1, 2 includes several wires. Quantity of wires may be different in outside strand 1 and inner strand 2 of the coiled wires. Before bending operation the outside strand 1 is coiled on top of the inside strand 2. In result of bending the outside strand 1 and inside strand 2 form the united U-structure with a fixing loop 3 at the bending spot, which is placed in the same eye 4. Strands 1 and 2 are coiled to the lead 5, and the eye 4 is fixed to support elements by standard intermediate links.

EFFECT: simplifying design due to reduced number of parts.

6 cl, 2 dwg

Description

The invention relates to the field of electric power and can be used on overhead power lines and fiber optic communication lines as tension clamps for attaching wires / cables to anchor supports.

Known spiral tension clamp for anchoring the wires containing strands of wire spirals with one direction of winding (US, 7191496).

The closest analogue of the invention is a spiral tension clamp for anchoring the wires and cables of overhead power lines, or fiber optic cables of communication lines, or cables embedded in a lightning cable containing twisted onto a wire, or cable, or cable two U-shaped strands of wire spirals with the opposite direction of winding, consisting of two branches each (RU, 2315408 C1).

The disadvantages of the known device should indicate the following. The known device has a rather complex design for attaching spiral strands, including a significant number of parts, providing transmission of forces from tension and torsion.

The technical result to which the invention is directed is to simplify the design by reducing the number of parts, which, in turn, is achieved by providing a simpler load sensing circuit.

The specified technical result is achieved in that in a spiral tension clamp for anchoring the wires and cables of overhead power lines, or fiber optic cables of communication lines, or cables embedded in a ground wire containing at least one cable or cable, or cable, at least , two strands of wire spirals with the opposite winding direction, consisting of two branches each, the strands are woven into one another and bent into a single U-shaped structure, forming a fixing loop at the bend, married on one thimble.

The angle of winding strands of wire spirals woven into one another can be different.

Strands of wire spirals having the opposite direction of winding can be made of wire of different diameters.

Strands of wire spirals having the opposite direction of winding can be made of wire of different materials.

The invention is illustrated by drawings, where figure 1 shows a General view of a spiral tension clamp with two strands of wire spirals forming a U-shaped structure; figure 2 is a General view of a spiral tension clamp with two U-shaped structures.

The spiral tension clamp (hereinafter referred to as the clamp) contains the outer 1 and inner 2 power strands of wire spirals made of wire (cylindrical spiral) with different winding directions. Each of the strands of wire spirals 1, 2 contains several wires, and the number of wires in the outer 1 and inner 2 strands of wire spirals can be different. The outer 1 strand of wire spirals is wound over the inner 2 before the bending operation. As a result of bending, the outer 1 and inner 2 strands of wire spirals form a single U-shaped structure with a fastening loop 3 in place of the bend, which is located on one spider 4. Strands 1 and 2 are wound on the wire 5, and the thimble 4 is attached to the support elements by means of standard intermediate links.

If necessary, for example, in the case of perception of an increased tensile load, the number of strands of wire spirals can be increased by additional pairs 6, 7 of oppositely wound wire spirals that are wound on top of other pairs. Also in this case, between the strands of wire spirals interwoven into each other at the place of their contact with the thimble, it is advisable to place a gasket (not shown in the drawings) to prevent excessive compressive loads between the strands.

The work of the clamp is as follows.

Under the action of a tensile axial force from the weight of the wire and additional load from wind or ice on the wire, in addition to the longitudinal force, strands of wire spirals 1 and 2 arise in different directions.

The arising multidirectional torques cancel each other out, while for the mutual compensation of torsion torques of wire 5 it is necessary that the stiffnesses of the outer 1 and inner 2 strands of the wire spirals are equal. Since the strands of wire spirals 1 and 2 work in the zone of elastic deformations, their stiffness can be calculated as stiffness k coil spring:

,

,

Where

d _D is the diameter of the wire;

d _F - winding diameter (measured from the axis of the wire);

n is the number of turns (depends on the angle of winding α);

G - shear modulus (depends on the material of the wire).

Thus, by such parameters as the diameter of the wire, the number of turns (or the winding angle α), it is possible to achieve equal rigidity of each strand of wire spirals.

Claims (6)

1. Spiral tension clamp for anchoring wires and cables of overhead power lines, or fiber optic cables of communication lines, or cables embedded in a ground wire containing wound on a wire, or cable, or cable, at least two strands of wire spirals with the opposite direction of winding, consisting of two branches each, characterized in that the strands are woven into one another and bent into a single U-shaped structure, forming a fixing loop at the bend at one bend. 2. The spiral tension clamp according to claim 1, characterized in that between the interlocked strands of wire spirals there is a protective cushioning insert to prevent excessive compressive loads between the strands. 3. The spiral tension clamp according to claim 1, characterized in that the angle of winding strands of wire spirals woven into one another is different. 4. The spiral tension clamp according to claim 1, characterized in that strands of wire spirals having the opposite direction of winding are made of wire of different diameters. 5. The spiral tension clamp according to claim 1, characterized in that strands of wire spirals having the opposite direction of winding are made of wire of different materials. 6. The spiral tension clamp according to claim 1, characterized in that U-shaped structures may be more than one.

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