RU2342753C1 - Device for strengthening wires in anchor span - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention is attributed to high-voltage lines. Device for strengthening overhead line (OL) wires in anchor span comprises high-voltage line wire fixed on cross arm of anchor and intermediate poles using strain and support insulator strings. Flexible reinforcement rod (e.g. cable) is located over OL wire in its plane. This rod is provided with dead-end clamps at its ends. The clamps together with OL dead-end clamps are coaxially fixed on cross arms of anchor poles. Reinforcement flexible element on intermediate poles is located over OL wire and fixed in support clamps in combination with OL wire. In spans wire and flexible reinforcement element are interconnected being strained by at least one transverse link.

EFFECT: wire bearing capacity and tensile strength improvement.

8 dwg

Description

FIELD OF THE INVENTION

The invention relates to high-voltage power lines (OHL) and solves the problem of increasing the reliability of their operation in terms of increasing the mechanical strength of the OHL wires within the anchor span, when exposed beyond the normative values of the transverse load, for example, ice.

State of the art

Known for urban electric vehicles are chain pendants for contact wires, including a support cable, to which a contact wire is suspended on strings. The entire load from contact wires, suspensions, ice and wind loads is taken by a load-bearing cable (Afanasyev AS, “Contact and cable networks of a tram and trolleybus.” M: Stroyizdat, 1974, pp. 16-19, Fig. 7).

It is known to strengthen rod metal structures, for example, to strengthen I-beams by increasing their cross-sections by welding, for example, rod elements to the shelves of I-beams. In this case, the I-beam reinforced with rod elements increases its bearing capacity in comparison with the original design. The reinforcing elements and the initial I-beam, connected by welding, work on bending as a whole (I. Rebrov, “Strengthening of Bar Metal Structures”. L .: Stroyizdat, 1988, p. 18-20, Fig. 1.7).

Disclosure of invention

The invention is aimed at preventing overhead line breaks in sections of the route (anchor spans) with extreme climatic conditions. Under these conditions, the ice and wind loads acting on the wires go beyond the standards for determining their magnitude, which, taking into account the temperature effects, leads to breakdowns of the overhead lines with corresponding negative consequences.

This goal is achieved by increasing the load-carrying capacity of the overhead wire (increasing the tensile strength of the wire) by introducing a flexible reinforcing rod, for example, a gain cable placed on top of the overhead line, mounted on anchor and intermediate supports and connected to the overhead line with an interference fit with at least one connection in span to ensure the possibility of joint operation of the overhead wire and the flexible reinforcement rod under the action of a transverse load (while ensuring the perception of part of the load from the overhead wire with a flexible reinforcement rod I am).

Brief Description of the Drawings

Figure 1 shows the layout of the overhead line and gain cable. Figure 2 shows the attachment point of the gain cable and wires to the tension string of insulators. Figure 3 shows the attachment point of the gain cable and overhead line wires in the span. 4 and 5 show the projection of the mounting of the gain cable to the supporting string of insulators. Figure 6 shows the tension clamp of the gain cable. Figure 7 presents the installation process of the tension clamp of the gain cable. On Fig presents sequentially dual rolling rollers with hinged cheeks clips.

The implementation of the invention

A device for increasing the strength of overhead lines in the anchor span includes a steel-aluminum wire of a high-voltage line 1, mounted on the cross-arms of the anchor 2 and intermediate 3 supports through tension 4 and supporting 5 insulator strings. A flexible reinforcing rod, for example, a steel reinforcing cable 6 (Fig. 1), made with an insulating aluminum braid, fixed at the ends of the anchor span in the tension clamps 7, which together with the tension clamps 8 of the VL 1 wire, are jointly connected on top of the VL 1 wire in its plane articulated by a finger 9 with a tension string of insulators 4 through the eyelet 10 (Fig.2 and 6). The gain cable 6 together with the wire 1 on the intermediate supports is fixed in the supporting clamps 12, and between the wire 1 and the gain cable 6 there is an aluminum strip 11 (Figs. 4 and 5). In the spans, the wire 1 and the gain cable 6 are interconnected with an interference fit at the point of the maximum sag of the wire 1 by a connecting clamp made, for example, of two supporting clamps 12 connected pivotally by a finger 9 (Figure 3).

The presented device is implemented as follows.

Alternately, in the intermediate supports, the supporting clamps 12 are replaced by double expansion rollers (Fig. 8), in the lower of which 13 the wire 1 is transferred in the reverse order of transferring from ordinary rolling rollers to the supporting clip. It uses well-known devices (Magidin F.A. Construction of power lines. M: Higher school, 1987, p. 171).

A reinforcement cable 6 is rolled on the ground along the length of the anchor span, onto the free end of which a tension clamp 7 is attached.

A mounting block 14 is installed on the anchor support (Fig. 7), and a mounting clip 15 is attached to the wire 1, the mounting cable 16 from which is pulled through the block 14 so that the fastening of the tension clamp 8 to the tension string of insulators 4 can be loosened, and then finger 9 is removed and thus the joint is disconnected. Through another mounting block 17 mounted on the traverse, a reinforcement cable 6 is lifted by a rope 18 together with a tension clamp 7. Then, using the mounting tower, the tension clamp 8 of wire 1 is connected coaxially to the tension chain 4 with a finger 9 and the tension clamp 7 of the reinforcement cable 7 is over it (Fig. 2).

On the intermediate supports, the reinforcement cable 6, with the help of mounting blocks, is raised and sequentially brought into the upper rollers 19 of the successively dual rolling rollers (Fig. 8). On the second anchor support, a mounting block 14 is installed through which the reinforcement cable 6 is drawn. The reinforcement cable is tensioned in a known manner, for example using a tractor. The tensioned cable of reinforcement 6 is sighted in order to ensure its placement above the wire 1 in all spans to a height not less than the height of the connecting clamp (Figure 3). On the reinforcement cable 6, the attachment point of the tension clamp 7 is marked, after which the reinforcement cable is lowered and the tension clamp 7 is attached to it in the marked place. Installation is carried out according to the steps described above.

The transfer of the wires of the overhead line 1 and the gain cable 6 from sequentially doubled rolling rollers (Fig. 8) with the folding cheeks of the cage 20 and 21 to the supporting clip 12 is carried out in this order: the cheek 20 is tilted, the wire 1 is withdrawn and it is lifted, then the cheek 21 is tilted , gain cable 6 is output and the lift continues already together. A feature when transferring wire 1 and a flexible reinforcement rod 6 is the installation of an aluminum strip 11 between them during the lifting process. Further operations for jointly fixing the wire 1 and the gain cable 6 are standard.

After fixing the wire 1 and the gain cable 6 in the supporting clamps in place of the greatest sagging of the wire 1 using a clamp, for example, pulling the wires of the overhead line 1 and the gain cable 6 to each other with the installation of a connecting clamp between them (Figure 3).

Obviously, the wire 1 together with the gain cable 6 form a jointly working cable-stayed system, in which the tensile stresses in the wire 1 due to the perception of a part of the transverse load applied to the wire 1, the gain cable decreases. In the limit, the gain cable when connecting it to the overhead wire at one point - the point of maximum sagging of the overhead line - will perceive when it sags no more than half the transverse load falling on the overhead line. With an increase in the number of suspension points, this value will increase. The transverse dimensions of the gain cable, the number and location of attachment points to ensure the required margin of safety for the overhead line are determined by calculation taking into account their own weight, atmospheric loads and temperature exposure.

Claims (1)

A device for increasing the strength of overhead lines in an anchor span, including an amplification object - a high-voltage line wire, mounted on traverses of anchor and intermediate supports using insulator strings and reinforcing means, characterized in that the reinforcing means is a flexible rod, for example, a gain cable placed over the wire The overhead line in its plane, mounted on the yoke of the anchor and intermediate supports and connected with an interference fit with the overhead line with at least one transverse connection in the span.

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