SU1390334A1 - Crosspiece of power transmission line mast - Google Patents

Abstract

This invention relates to power construction. The purpose of the invention is to reduce material consumption. Traverse support is made of two triangular sections 1, located obliquely and connected pivotally to each other and with racks 3 supports. The traverse sections are interconnected by a rigid horizontal link 5 and a vertical link 6, attached to the middle by a horizontal link. The outlets of the end phases 7 are attached to the points of fastening by a rigid horizontal connection to the crosshead sections, and the wires of the middle phase 8 to the node of the connection of a rigid horizontal connection to the vertical one. 6 Il. (L №} 5 Y. /

Description

I The invention relates to the construction, in particular to the construction of pylons covering the type of high-power and ultra-high voltage overhead power lines.

The aim of the invention is to reduce the consumption of materials.

I FIG. 1 shows the traverse of the | pore along the power line, the orthic view; Fig, 2 - section A-A on g, 1; on fig.Z - section BB on) D.1; Fig.4 section bb In .g.1; on fig.Z - traverse on support d with straps, general view; Fig. 6 shows the circuit of a separate triangular part of the raver with the forces acting on it.

The support beam of the three-phase power transmission line is made up of two rectangular I sections 1 located inclined in the plane of the support and connected by means of joints 2 with the legs 3 of the support. The triangular sections 1- are interconnected by means of cable 4 and are connected above the level on supports 3 with rigid horizontal connection 5, which is attached in the middle part by a vertical Pus connection 6 to the hinge 4, of the sleeve 7 of insulators the extreme phases are attached ij3 nodes connecting horizontal I link 5 to the triangular sections of the spatial farm, and a wire of insulators 8 of the middle phase is attached to the node attaching vertical link 6 to a rigid horizontal link 5 The support can be completed as free-standing internal by cross links (Fig. 1) and with hinged fastening of the pillars 3 to the foundations and paired straps on both sides of the support along the power line (Fig. 5),

In normal operation, the crossbar is experiencing vertical loads from the weight of the phases of wires and cables and horizontal loads from wind pressure on the wires of phases and cables.

The main loads (especially for long-span traverse) are vertical loads of the weight of the wires of the phases, which are several times higher than the horizontal loads on the phases of the wind.

With a swivel joint of 4 sections 1 of the crosspiece, the transmission in this node of section 1 of the crosshead of moments is eliminated, which allows them to be completed

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five

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five

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more simple triangular shape with outgoing to the hinge 4 by themselves.

Figure 6 shows a diagram of a triangular section 1 of a spatial farm with the forces acting on it, where it is indicated: and Nd is the vertical and horizontal reactions transmitted in the hinge joint of 4 triangular sections 1; Vj, and Hj, are vertical and horizontal reactions transmitted in a hinged joint

2 triangular section 1 with stand

Supports; G: EC load transmitted by the middle phase 8 wiring in a swivel 4; Gj and, respectively, the weight and horizontal load transmitted by the end-phase wired 7; S is the force transmitted by a rigid horizontal connection 5.

The forces S, Gg, f are applied to the triangular section 1 in the assembly where the post 9 is suitable, which connects the linear in with 10 with converging; by themselves 11 and divides the triangular section into two triangular elements with a common rack 9.

The main working elements of the triangular section 1 are 10, 11 and rack 9. Most of the elements of the grid 12 are unloaded from the efforts and are truss-like elements. Only a few elements of the lattice 13 are loaded from the load, i is transmitted by the console 14 for the cable 15, but the forces in them are insignificant, since the load from the cable 15 is not great. Therefore, the elements of the lattice 12 and 13 have low consumption of materials and are simple in design.

Thus, due to the fact that the triangular sections 1 of the crosspiece have at the ends hinged joints 2 and 4 and loads 0 and T, transmitted by the end 7 of the extreme phase 7, are attached in the same node where horizontal connection 5 is suitable, in triangular sections 1 The main load is tested by the minimum number of elements and due to this, their material consumption is reduced and the design is simplified. I

The geometrical dimensions of the traverse hi and hj are taken depending on the values of the actual loads and the span of the traverse according to the results of the optimization calculation.

Size h is also assigned at least a certain amount required to provide an electrical dimension from the end phase arm to the support post 3 and the support crosspiece.

The criterion for optimizing the calculation; the traverse is to obtain the minimum traverse weight.

The fastening of the end-phase arm 7 at a distance h, j from the support beam level to the support legs 3 allows reducing the height of the support legs 3 by this distance, reducing the length of the horizontal connection 5 and thereby increasing the efficiency of the crosshead and the support as a whole.

The horizontal link 5 (Figures 1 and 3) is a flat horizontal truss connecting the attachment points of the wedge 7 of the extreme phases, developed in the plane of the crosspiece by the vertical link 6.

In emergency mode, the pull force along the overhead line of the wires of the middle phase is perceived by the horizontal link 5 and then transmitted from it to the triangular sections 1 of the spatial truss. In this mode, CA 16 of the horizontal link 5 experiences compressive forces, and the vertical link 6, attached along the middle of the horizontal link 5, provides a reduction in the calculated length of the coil 16 and their stability in the plane of the crosspiece. In addition, the vertical link 6 transfers the weight load G of the middle phase bend 8 to the hinge 4 crosshead.

A distinctive feature of the traverse design is its scheme, in which, as was shown above, 5 places of application of loads are set up with a traversing structural diagram in such a way that only a small number of basic elements experience the main load; CA 10, 11 0 and the rack 9 triangular sections 1 and horizontal connection 5.

The remaining elements of the traverse should be either truss-like elements or loaded with little effort. 5 Due to the accepted design of the traverse, it is highly economical / especially with significant loads from the phases of wires and large spans,

Claims (1)

0 Formula of the invention Power line yoke, comprising a spatial farm, having triangular shaped obliquely mounted hinge sections for suspension of the extreme and middle phases, characterized in that, in order to reduce the material intensity of the truss, the inclined truss sections 0 are connected by internal nodes along the axis of the line, while the traverse is provided with a rigid horizontal bond connecting the middle part of the sections and a vertical link attached to 5 in the middle of the horizontal communication and to the hinge joint of the cross section sections, the extreme phases of the line being suspended from the horizontal connection nodes to the cross section 1, and the middle phase to the vertical connection from the horizontal connection. five 1 f y iNJ4r4 | NW4lNJNNND I: jl IXXx cXlXXXXXl // 516 Fi.Z FIG. four 15 Fi.b