SU863826A1 - Power transmission line gantry support - Google Patents

Description

(54) PORTAL SUPPORT OF THE ELECTRICAL TRANSMISSION LINE

The invention relates to the construction and is intended for the construction of transmission towers. A power transmission pole with a Y-shaped stand on Tl straps is known. The main disadvantage of such solutions is the large number of pulls and foundations for them. The support is difficult to install. Closest to the present invention is a high-power and ultra-high-voltage power line portal support, including sloping racks connected by a cross-beam, bracings, rap lords of insulators and wires of the extreme and middle phases. The straps provide longitudinal and lateral stability of the support. The wires of the wires are fastened to the brackets and in the center of the traverse straight at the level of the hinges 2. The disadvantage of such an ax is that when a horizontal wind load is applied to a structure, only one strut and an adjacent pair of hinges take part in the work. The opposite rack and a pair of offtakes in the work on the loads of this jHatfraction do not take part, i.e. there is an uneven distribution of efforts among the support elements. The aim of the invention is to reduce the material consumption of the support by uniformly distributing the efforts over the amps. This goal is achieved by Tavi, that in the portal support of the transmission line including inclined racks connected by a crossmember, bracings, wires of insulators and wires of the extreme and middle phases, the cross bar is provided with inclined cantilever elements directed in the direction opposite to the inclination of the racks that respond to them and the free ends of the inclined cantilever elements are located at the level of the horizontal, passing through the intersection point of the propellant axes of the uprights, while the wires of the outer phases are attached to the free ends of the inclined corners epementov solo, and the free end of each cantilever member nislonnogo soedinep lopol1G1 tion ott zhkoy attached to the upper end opposite rack prt1 than Girlikh technological command isopentane torso middle phase

suspended to .. free koiom tilt

№1k CONSOLE elements

FIG. Figure 1 shows schematically the support with the location of the attachment of the two extreme phases at the level of the horizontal, prokoda I1iii through the intersection point of the axes of the front axles, and the middle phase at the level of the traverse; in fig. 2 - support with the location of mounting of all phases at the level of the intersection point of the longitudinal axes of the racks.

The support consists of dowh inclined racks 1, the longitudinal axes of which intersect at point 2, pivotally akreppa11Sh: .1Х on the foundations 3, horizontal TfK version 4, hingedly connected to racks 1, even1: 1, otref 5, cannibal console, epemagg b By means of which the fastening points of the edges of the Fir Hirx are located at the level of the continuation of the cross-section of the axles of the racks, and the Saami console has a cantilever element (S is attached 1Le1M to the racks at the level t) a-1per.

The average phase of the AC power line is attached to the crosspiece at POM1X1. The figurative arm 7 (Fig. 1) in another embodiment (Fig. 2) the middle phase (as well as the outer ones) is attached at the level of the point of intersection of the longitudinal axes of the uprights and to the inclined axles of 1 With the Y-shaped pfp pd 8, fastening the latest cantilever elements to the pillars. This is done by pulling the pins 9.

The optimum distance between point 2 and the crossbeam with the middle phase fixed on it is within (02-О5) where H is the height from ground to crosshead.

The support works as follows.

When a wind load B, applied at the level of point 2, acts on the support, both racks 1 accept these loads, one working in compression, the other - in compression. Since wind loads B are applied at the level of point 2, in which the longitudinal axes of the uprights 1 intersect, according to the rules of theoretical mechanics, the force transmitted to each upright coincides with the geometrical axis of the upright.

For more than 10% of the known and proposed onor, we calculate in the uprights and legs of both supports, on the npi-Dviepe support shown in FIG. 2,

In the well-known support when

the wind load B applied on H traverse 4 to it, according to the static equation (the sum of moments relative to the point O), the force S in the right

the rack 1 is equal to the product B and H divided by the shoulder, i.e.

S .M

In the right delay 5 force N by a similar rule is equal to the product B and H divided by the arm S, t p

N- 1 - -.

The projected stand and pull on the wind load of this direction do not work.

However, when the wind load is applied through a precinct direction, le lengthened conditions appear in them.

13 wind support 1 load B, deBytouiasi at the level of point 2 at the height, i, .cp, -f -f О, 5 II, is perceived as one | (the version of the two. T storki-gi 1,

Us1; l1sh S and Sn fi o6eirx racks are equal in magnitude, as opposed to

sign) su. According to the equation of moments with respect to the points C of the IC, the efforts S and 5p are equal to the product of the type B and the height HbO, 5 N, doppeipotyty pa pl (cho 2 ti, Ie

0, .e iSiill4i “iO, .5

SH

d- 2h Us1 N in offtakes 5 are theoretically equal to O (cyivJMa moments with respect to point 2: O, Ni –x- O).

However, delays are necessary: to give support to the longitudinal and lateral stability.

In the version of the support with suspension medium

the phases at the level of the crosspiece 4 (fig. 1) from the tension work with a force - D- (as in a conventional support, but with a coeffi -ient- i-).

As can be seen from the comparison of the results of the calculation, the forces in the racks are the same. The proposed support is smaller than that in the racks and legs of the known support.

Thus, reducing the loads in the racks and straps by distributing them more evenly between the support elements helps to reduce the consumption of the material of the uprights and to reduce

Dimensions and consumption of material® on the foundations of the racks and crust.

In addition, the increase of the two extreme phases in the support variant shown in FIG. 1 allows, due to an increase in the sag of the wires of these phases, to the level of the sag of the wires of the middle phase, to reduce downward pressure and, consequently, to be able to apply lighter wires with a lower consumption of core steel.

Claims (2)

1. Portal support of the power line, including inclined stands connected by a cross-bar, straps, wires of insulators and wires of the extreme and middle phases, characterized in that, in order to reduce the material intensity of the support by uniformly distributing the forces on the stands, the cross bar is inclined cantilever the elements, for example, embedded in the wall, the opposing slope of the corresponding struts, and the free ends of the inclined cantilever elements are located on the horizontal ursdan passing through the point of suspension of the longitudinal axes of the struts, while the wires of the outer phases are attached to the free ends of the inclined cantilever elements, and the free end of each inclined cantilever element is connected by an additional tip attached to the upper end of the opposite rack. 2. The support according to claim 1, characterized in that the wires of the insulator to the conductor of the middle phase are attached to the free ends of the inclined cantilever elements. Sources of information taken into account in the examination 1. USSR author's certificate number 270036, cl. E 04 C 3/32, 1965. 2. USSR author's certificate No. 218400, cl. E 04 H 12 / OO, 1965.