BG65248B1 - Bracket for conductors and optical fibre cables and method for laying thereof - Google Patents

Abstract

The bracket for conductors and optical fibre cables serves to tie together two or more conductors, on one side, with optical fibre cables, on the other side, the partition wall (1) of which separates the cables (2) from the conductors (3). The inner surfaces of the bracket are shaped as oval seats (8 and 9) tightly embracing the cables and conductors laid therein that may be either parallel or non-parallel with respect to each other. The brackets (10) may be used for implementing the method of laying optical fibre cables on conductors by spiral winding the optical fibre cables (2) around a conductor (3).

Description

(54) CONNECTORS AND FIBER CABLES AND METHOD OF APPLICATION

Technical field

The present invention relates to a clamp for conductors and fiber optic cables and a method for laying them, and also relates to connecting elements and devices for conductors and cables, and in particular to clamps connecting electrical and / or lightning conductors on the one hand, with fiber optic cables, on the other hand, and a method of laying them. The bracket and method are mainly used in the construction of telecommunication line systems in conjunction with overhead power lines and in all other cases where cables and wires are required.

BACKGROUND OF THE INVENTION

The increasing use of fiber optic cables, indoors and outdoors, in conjunction with power cables, lightning conductors and phase conductors of overhead power lines and electrical installations, necessitates the protection of fiber optic cables from mechanical damage, as during their laying and during their many years of operation.

From U.S. Pat. No. 4,813,105, a ribbon-shaped cable tie clip is known that can bundle parallel wires together.

A disadvantage of the known ribbon clamp is the inability to separate the cables between them, which are glued together in parallel.

OtUS 6 327 753 is another known clamp that separates the two ropes in parallel and has special treatment of the adjoining surfaces which prevent the sliding of the ropes.

The disadvantages of the famous second bracket are that it connects only two parallel ropes and that it is made of much harder and more thermally conductive materials than those from which fiber optic cables are made.

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a bracket for wires and fiber optic cables and a method of laying them connecting two or more wires on one side with fiber optic cables on the other, which reduces the potential for mechanical damage to the cables , to extend their useful life and to reduce the likelihood of damage to them, as well as a method of laying fiber-optic cables secured with a bracket on carrier wires to prevent the cables from being separated from the wires when zpuskane and / or destruction of the brackets.

The objective is achieved by a clamp for wires and fiber optic cables, for connecting two or more wires on one side with fiber optic cables on the other, and has a partition wall that separates the cables from the wires.

In one preferred embodiment, the bracket is divided on each side of the partition wall into two parts, with two of them gripping and clamping the wires and the other two cables.

In an embodiment of this preferred embodiment of the clamp, the group of connected parallel cables may not be parallel to the group of parallel wires.

In another preferred embodiment, one part of the bracket is fused to one side of the partition wall and the other part passes through a special opening in the opposite side of the partition wall, and the bracket grips and clamps together the wires and cables.

It is advisable for the inner surfaces of the bracket to be shaped like oval beds, tightly enclosing the cables and conductors laid therein, which may be parallel or non-parallel.

The objective was also achieved by a method of laying fiber-optic cables on wires by means of clamps, with fiber-optic cables spiraling around a conductor.

The advantages of the proposed wire clamp and fiber optic cable are that it provides better cable protection, which significantly reduces the mechanical damage caused by friction between them due to the significantly different hardness of their contact surfaces, the different their temperature coefficients of contraction and expansion and their unequal elastic and plastic deformation, resulting in the same and simultaneous short and long-term external influences, which prolongs the time of full life and the risk of damage to the cables is reduced. Another advantage of the clamp is that it can be made of low-cost polymeric materials that require simple technology to produce them. An advantage of the method of spiral fiber-optic cable laying around a supporting metal conductor, with the help of the direct connection brackets in question, is that it prevents the cable from sagging and falling from the carrier conductor, with all the negative consequences of this, even when omitted and / or the destruction of all brackets.

Brief explanation of the accompanying drawings

Figure 1 is a schematic view of the cross-section of a clamp according to the invention that connects parallel bundles of fiber optic cables and wires separated by a partition wall;

Figure 2 is an embodiment of a clamp according to the invention that connects two perpendicular bundles of parallel cables and wires.

Figure 3 is an exemplary embodiment of a clamp according to the invention that connects one cable to one wire in parallel

Figure 4 is an exemplary embodiment of a clamp according to the invention that connects a cable to a single conductor, which are parallel to each other.

Figure 5 shows a spiral-shaped cable around a phase conductor using clamps as shown in Figure 4.

Examples of carrying out the invention

Each of the brackets in FIG. 3 and Fig. Connecting the fiber optic cable 2 to the conductor 3 according to the invention has an integral partition wall 1 made of polyethylene or polypropylene and / or other material similar to the physico-mechanical and dielectric characteristics of the materials of which are fabricated fiber optic cable sheaths. The bracket has shaped beds for the cable and the carrier. It clamps the wires and cables together, and the passage of the ribbon-shaped portion of the clamp 6 through the opening 7 into the partition wall and the oval beds 8 or 9 ensure a tight grip and secure fixation of the cables and wires.

The exemplary brackets of FIG. 3 and FIG. 4 as well as those of FIG. 1 and FIG. 2, can be widely used in fiber optic cable laying on lightning or phase conductors of overhead power lines, for supporting ropes for open laying of cables between poles, in open and closed installations of electrical transformer stations in energy, industry, railways. and power plants, as well as indoor and underground cableways. For example, the bracket (Figure 4) can be applied to the spiral-laying method (Figure 5) of a fiber optic cable over a lightning or phase conductor, which are commonplace in practice.

In the various operating modes and atmospheric conditions for the operation of wires and cables, the bracket according to the invention provides five main advantages:

1. Wind conductors begin to swing and / or vibrate, whereby the partition wall in the bracket significantly limits the mechanical effects of the metal conductors on the cables.

2. Iced wires bounce when pieces of ice fall from them, dragging along the cables. In these cases, the partition wall of the bracket reduces the undesirable mechanical effects of the metal conductors on the cables, such as tripping and contraction, as a result of their significantly different elastic and plastic deformations while simultaneously jumping and falling, which is often accompanied by vibration and rocking. , as referred to in item 1.

3. At atmospheric and other temperature changes, the different degree of contraction and expansion of the cables and metal wires generates friction forces between them, which are largely absorbed by the partition wall of the bracket, which protects the cables from mechanical damage.

4. In the case of connecting a cable with a phase conductor, which is heated by the current flowing through it, the partition wall of the bracket thermally insulates and reduces the temperature deformations of the cable, which also protects it from accelerated aging.

5. The bracket is easy to install because it is small, lightweight and with only one tightening it covers the cable and the wire at the same time (Fig. 3 and Fig. 4).

The proposed brackets are used for direct connection (Fig. 4) of the cable so that it is coiled (Fig. 5) around the wire. This increases the security of connecting the cable to the conductor and prevents electrical accidents, for example when it is attached to a lightning conductor over the phase conductors of an overhead power line. In this example, if in extreme mechanical and / or temperature conditions all the brackets break simultaneously, then the cable will not fall or sag because it will remain coiled around the conductor.

Claims

Claims (6)

1. Bracket for wires and fiber-optic cables, characterized in that it connects two or more wires on one side with fiber-optic cables on the other side, whose partition wall (1) separates the cables (2) from the wires (3) . 2. The cable and fiber optic cable clamp according to claim 1, characterized in that it is divided on each side of the partition wall into two parts, two of them (4) gripping and clamping the wires and the other two (5) - the cables. Wire and fiber optic cable clamp according to claim 2, characterized in that the group of connected parallel cables (2) may not be parallel to the group of parallel connected wires (3). Wire and fiber-optic cable clamp according to claim 1, characterized in that one part of it is fused to one side of the partition wall (1) and the other part (6) passes through a special opening (7) in the opposite side of the partition wall and the clamp encloses and clamps together the wires and cables. Wire and fiber optic cable clamp according to claims 1 to 4, characterized in that the inner surfaces of the clamp are shaped as oval beds (8) and (9), tightly enclosing the cables and wires therein, which may be parallel or non-parallel to the JI. Method for laying fiber optic cables on conductors by means of clamps (10), characterized in that the fiber optic cables (2) are spiral-shaped around a conductor (3). Attachment: 5 figures