SU910990A1 - Anchored corner mast for power transmission lines - Google Patents

Description

(5) ANCHOR ANGULAR SUPPORT OF ELECTRICAL TRANSMISSION LINES

I

The invention relates to the construction of high voltage overhead power pylons.

The known angular support of the high voltage power line, containing the rack and the foundation, the support leg being placed relative to the plane of the foundation at an angle of 1. The disadvantages of the known support are that due to the inclination of the rack, a reduction in the wresting loads on the foundation occurs during normal operation, but is not achieved unloading from forces of the installation mode: when all wires and cables are mounted in one span, in another span, wires and cables are not mounted. In this case, the forces of one-sided pulling of wires and cables act on the support in the direction perpendicular to the direction of pulling forces of wires and cables in normal operation. The oblique position of the support stand complicates the mounting of the support by helicopter, since at the moment of installation of the support on the foundation it can turn over due to its own weight due to the fact that the center of gravity of the support is located with eccentricity relative to the center of the foundation and a moment occurs that overturns the support .

The closest technical solution is an anchor corner support of a high-voltage transmission line of 10 strands, containing racks with traverses and a strut. This anchor yi is an A-shaped catch with a strut located in the plane of the perpendicular A-shaped face with the outer

15 of the angle of rotation of the transmission line, is made of logs and is used on transmission lines up to 20 kV 2.

The disadvantage of this design

20 is that when the support is operated in the normal mode, the inclined racks of the A-shaped edge work in compression, and it supports the extension

A load of the own weight of the support, wires and cable is transferred to the A-shaped stand pillars, which creates an additional load for securing the supports. For poles of power transmission lines with voltage of kW kV, 220 kV and higher, the magnitude of the load from the weight of the pole, wires and cables is significant and for the support of a known structure, the increase in the loads on the foundations causes the expenditure of additional materials and facilities. In the known support, the stand and the strut are directly fixed to the ground without the use of special foundations; this is possible only for wooden supports and the power transmission line with a voltage of up to 20 kV. For higher voltage lines (110 kV and above) such anchoring of support nodes is not suitable. devices embedded in the ground or surface foundations are required. In addition, the design of the A-shaped support with a strut when used for power transmission towers of higher voltages (above 20 kV) is more complex and time-consuming to manufacture.

The purpose of the invention is to reduce the load on the foundation and simplify the design of the support.

This goal is achieved by the fact that the anchor angle support of the power transmission line, which includes the stand, traverse, strut and the foundations of the stand and the strut, is provided with an additional strut, with the struts located on the inside of the angle of rotation of the power line and hinged to the stand of the support, while the foundations of the pillar of the support and the struts along the axis of the traverse are determined from the ratio

lt

where M is the moment from the strength of the wires and cables at the top of the foundation;

N - allowable load on the foundation of the support stand; G - weight of the support stand, wires

and cables.

In addition, the foundations of the rack and struts can be interconnected by spacers.

FIG. 1 shows a single chain anchor angle support, general view; in fig. 2 - double-chain anchor angle bearing. General view; in FIG. 3, resolution A — L in FIG. 1 and 2; ne fig, bb section in fig. 1 and 2; in fig. 5 diagram of the loads on the support during normal operation; in fig. 6 - section bb In figure 5; in fig. 7 diagram of the load on the support during the installation mode of operation; in fig. 8 is a section of the G-F in FIG. 7

The anchor angular support includes a stand 1, for example a tubular section with cross-pieces 2 and struts 3 and an additional strut k located on the inner side of the angle of rotation of the transmission line. The stand rests on the foundation 5a and the struts on the foundations 6. When installing the support in weak soils and ensuring an even distribution of horizontal loads on the foundations, the latter are interconnected by spacers 7.

When the support is operating in normal mode (wires and cables are suspended on both sides of the support, the resultant horizontal force of wires and cables is directed along the traverse axis (see FIG. 6). In this mode of operation, the value of the vertical load-lifting base 5 1 М „is determined by the formula

  T where M is the moment from the power of the wires and cables at the level of the top of the foundation;

A is the distance between the foundations of the support stand and the struts along the axis of the cross-arms; G .- weight of support stand, wires

and cable.

The magnitude of the vertical compressive load on one of the foundations 6. braces 3 and is equal to

L

N

p a

Thus, as can be seen from the above formulas, in normal operation of the support, the vertical tearing load (N) on the foundation 5 of the rack 1 is reduced by the value of the weight load G, the foundations 6 of the strut 3 and are unloaded from the weight load G.

Claims (2)

1. USSR author's certificate W 487220, cl. E N 12/00, 1972. 910990 2. Kryukov KP, Novgorodtsev B.P. Constructions and mechanical calculation of power transmission lines. L., Energie, 1970, p. 1 + 9-150, fig. 6-9. Fig.E Fsh "J fig. 5 rL 910990 B-B gd 0tfe, d