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Cross arm for transmission towers

A technology of transmission tower and cross arm, applied in the field of transmission line design, can solve the problem of waste of plane inclined material on the cross arm, and achieve the effect of reducing weight, simple and reasonable structure arrangement

Active Publication Date: 2015-05-13
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional transmission line iron tower cross arm has always been in the form of a right-angled triangular plate structure with a certain thickness. The schematic diagram of the structure is as follows figure 1 As shown, the lower plane of the cross arm is a rectangle formed by a right-angled side of the triangle and the side where the thickness of the triangular plate is located, parallel to the ground, and the upper plane is a quadrilateral inclined plane formed by the hypotenuse of the triangle and the side where the thickness of the triangular plate is located. It mainly bears the vertical load of the hanging point of the cross arm, and does not bear the longitudinal unbalanced tension. Therefore, the oblique material connecting the two main materials on the upper plane of the cross arm needs to be disconnected at the end or root, that is, there is no cross diagonal at the end or root. This arrangement of cross-arms leads to the waste of planar inclined materials on the cross-arms to a certain extent

Method used

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Embodiment 1

[0037] Such as figure 2 Shown is a schematic structural view of an embodiment of a cross arm for a power transmission tower provided by the present invention. The number of internodes of the cross arm in Embodiment 1 is 4, and the cross arm includes a lower plane front side linear main material 1, a lower plane Rear linear main material 2, upper plane linear main material 3, upper plane upper triangular main material 4, upper plane lower triangular main material 5, lower plane oblique main material 6, front oblique main material 7, rear oblique main material Main material 8, duckbill-shaped wire-hanging rod 9 and tower body linear main material 10.

[0038] The straight main material 1 on the front side of the lower plane of the cross arm and the straight main material 2 on the rear side of the lower plane are bolted or welded through the oblique main material 6 on the lower plane to form the lower plane of the cross arm; the straight main material 3 on the upper plane is con...

Embodiment 2

[0040] A cross arm for a power transmission tower provided by the present invention is also suitable for a sharp-beaked cross-arm, that is, a duckbill-shaped wire-hanging rod 9 with a length equal to zero. Embodiment 2 of a cross-arm for a power transmission tower provided by the present invention is a pointed Mouth-shaped cross-arm, its structure schematic diagram is as follows image 3 shown by image 3 It can be seen that the main material of the upper plane of the sharp-mouthed cross-arm extends downwards to replace the triangular main material at the lower end of the upper plane, that is, the linear main material 3 of the upper plane replaces the triangular main material 5 at the lower end of the upper plane and connects with the lower plane, and the lower plane is triangular.

Embodiment 3

[0042] The structure of the upper plane of the cross arm of a power transmission tower provided by the present invention can be mixed and matched, considering the existence of quadrilaterals, triangles, and straight lines, such as Figure 4 Shown is a third embodiment of a cross arm for a power transmission tower provided by the present invention, consisting of Figure 4 It can be seen that the number of internodes of the cross-arm in Embodiment 3 is 4, and the cross-arm includes a straight main material 1 on the front side of the lower plane, a straight main material 2 on the rear side of the lower plane, a quadrilateral main material 14 at the upper end of the upper plane, and a straight line on the upper plane. Shape main material 3, upper plane upper triangular main material 4, upper plane lower triangular main material 5, lower plane oblique main material 6, front oblique main material 7, rear oblique main material 8, duckbill-shaped hanging wire rod 9 and tower body line...

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Abstract

The invention provides a cross arm for transmission towers. At least a middle internode is arranged between a first internode and a last internode of the cross arm, the upper planes of the first internode and the last internode are triangular, and the upper plane of the middle internode is a straight line connecting the vertexes of the two triangles. According to the cross arm for transmission towers disclosed by the invention, the stressing features of each rod piece of the cross arm are fully taken into consideration; and the cross arm for transmission towers is concise and reasonable in structural arrangement, thereby reducing the weight of the cross arm.

Description

technical field [0001] The invention relates to the field of power transmission line design, in particular to a cross arm for a power transmission iron tower. Background technique [0002] The main material of the lower plane of the cross-arm of the transmission line tower is generally controlled by the compressive stability, and the main material of the upper plane is generally controlled by the tensile strength. For transmission towers, the control of tensile strength is beneficial to give full play to the bearing capacity of components, and the tension members will not suffer from instability, instability and damage. [0003] The traditional transmission line iron tower cross arm has always been in the form of a right-angled triangular plate structure with a certain thickness. The schematic diagram of the structure is as follows figure 1 As shown, the lower plane of the cross arm is a rectangle formed by a right-angled side of the triangle and the side where the thicknes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04H12/24
Inventor 韩军科杨靖波李清华
Owner CHINA ELECTRIC POWER RES INST
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