SU767334A1 - Overhead electric power transmission line - Google Patents

Description

(54) AIR TRANSMISSION AIRLINE

one

The invention relates to construction, in particular to the distribution of electricity on the mediocre of overhead transmission lines, preferably at a voltage of 10 kV.

There are known overhead lines (VL) of power transmission, there are intermediate and corner supports and wires fixed to them. Anchor-angle supports of the strut type, consisting of a stand and two struts, were used as the corner supports in the well-known VL. The corner supports of the OHL are installed so that the equalizing point of the wires of the OHTL acting on the bisector of the internal angle of rotation of the OHTL passes between the mentioned struts 1.

The disadvantage of this overhead transmission line is that the arrangement of the corner supports does not provide for rational use of the base of the supports, since the anchoring plates of both supports of the support work in compression, and only one foundation (support base of the support) works to pull out.

Closest to the offer is an overhead power line, including intermediate

and anchor-angle supports with two struts installed at the vertices of the angle of rotation of the line and wire mounted on the supports, and the equinox of the tension of the wires acting along the bisector of the internal angle of rotation of the overhead line coincides with the direction of one of the struts 2. With this arrangement, the anchor10 angle the supports under loads of normal mode, the foundation of one of the strut works for compression, the foundation of the second strut does not work at all, and only one foundation of the rack works for pulling out

supports .. As a result of this, a significant amount of force is acting on the fung-g of the day-stand of the support;

20 take into account that it is advisable to choose the anchor plates of corner supports with a diameter of not more than 650 mm (for example, plates P-3 or P-4), since only under plates of such diameter

25, it is possible to develop the excavation of the pits with the same drilling machines that are used to develop the pits for the intermediate shells. With an angle of rotation VL equal to 60,

The 30 normative tearing force acting on the anchor plate of the P-3 brand of the angular anchor support and equal to 1.6 tons does not exceed the allowable value (1.8 tons). However, at an angle of rotation. VL, exceeding 60, pulling out forces acting on a, core plate of the support stand, significantly increase and at an angle of 2.4 tons, which exceeds the load on the plate (1/8 tons from the conditions of allowable pressure on the backfill soil). To increase the bearing capacity of the foundation, i.e. In order for the foundation to withstand large forces, it is possible to increase the dimensions of the anchor plates. However, an increase in the size of the slabs will lead to a significant increase in the volume of earthworks to an increase in the cost of construction of the OHL. In addition, special equipment (excavators, bulldozers) is required for the development of excavations under the increased size of slabs, the absence of which in the construction crew may long delay the construction of overhead lines. The purpose of the invention is to reduce labor costs and construction costs by increasing the bearing capacity of anchor-angular supports. mainly at angles of rotation greater than 6 (L The specified goal is achieved by the fact that in an overhead transmission line, turn on the intermediate and anchor but angular supports with two struts, the mouth At the corners of the angle of rotation of the line of the wire, mounted on supports, the direction of one of the struts of the supports is with the bisector of the internal angle of rotation of the line an acute angle of 10-30, and the direction of the other platform is blunt. cottages, including intermediate and anchor-angular support of the axle of pas; in Fig. 2 - the angle of rotation of an overhead line with an angled displacement of the strut type and with the decomposition of the acting forces on the sides of the parallelogram. VL includes intermediate supports 1, anchor-angle supports, strut type / containing rack 2 and struts 3 and 4, and phase wires 5, mounted on the supports. Anchor-angular support, installed at the angles of rotation. An overhead line such that the direction of one of the struts 3 is with the bisector A of the inner angle 1 of the line angle and the direction of the Other under the crossbar 4 forms an obtuse angle with the bisector of the internal angle of the line VL. The support post 2 is installed at the top of the dome on the angle of rotation of the power line. We will consider the operation of the support using the right parallelogram. AZ / 1 we obtain the resultant R t of the wires of the power line (which acts on the overhead angle θ of rotation of the overhead line) components R and C (Fig. 2), which component R R acts on the strut 4, and the component along the strut 3. From the action R str 4 transverse pulling force MD, which is made according to the formula N -kii --- kRsin. A compression force is transmitted to rack 2, determined by the shape, --- 1 (nd -kR.sinA. On the brace 3, the force from R is equal to O. From the action of the component R on the streamer 3, a compressive usinN is transmitted, which is defined by the formula N -i R --VRco6 "A. pull out the force N R - I RCOS A. The strut 4 does not force the force from R. Thus, the force acting on the support elements of R and R cN, N, -i RcoseL, is i. R5AviA, N -Ng- NV RCOsd .-- kTlsinA, N is the force acting on the foundation of the strut 3; increase the force acting on the foundation of the strut 4; effort acting on the foundation of the support stand; and Nj- forces acting on the foundation of the support stand from components R and R and NJ-forces acting on the foundation of the strut 3 from the components R and R; / forces acting on the foundation of the strut 4 of the composition of the fourteen R and R; R is the resultant wire; d. - the angle formed by the direction of the resultant wire (which coincides with the bisector of the internal angle of rotation of the line) with the direction of the strut 3; K - coefficient of proportionality (compressive and forceful proportions acting on the foundation of the support; it is the external external load effect) ..

Claims (1)

Claim Overhead power transmission line, including intermediate and anchor-angle supports with two struts, installed at the vertices of the angle of rotation of the wire line, mounted on the supports, so that in order to reduce labor costs and construction costs by increasing the bearing capacity of the anchor-angle supports, mainly at angles of rotation greater than 60®, the direction of one of the struts of the supports makes an acute angle of 10-305 with the bisector of the internal angle of rotation of the line and the direction of the other strut is obtuse.