Method for reinforcing transmission angle steel tower

A technology for angle steel towers and angle steels is applied in the field of reinforcement of power transmission angle steel towers, which can solve the problems of high cost, long power outage time and difficulty, etc.

Active Publication Date: 2010-10-06
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The constant changes in the external environment and the continuous revision of the design code make most of the transmission angle steel towers in operation in my country unable to meet the actual use conditions. We have to re-evaluate the safety of the transmission lines that have been in operation. When the operating transmission angle steel towers cannot meet the actual u

Method used

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  • Method for reinforcing transmission angle steel tower
  • Method for reinforcing transmission angle steel tower
  • Method for reinforcing transmission angle steel tower

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

Example 1:

For the traditional hot-rolled angle steel specification Q345L125×8 commonly used in transmission angle steel towers, the limb width H=125mm, the thickness t=8mm, the bolt specification M20, and the 8mm-thick V-shaped section member is used to strengthen it. When the V-shaped When the section member is connected with the hot-rolled angle steel bolt, the length of the smooth section is taken as B=46mm; the inner arc radius of the curved part is R1=8mm-2mm=6mm, the outer arc radius R2=R1+8mm=14mm; the top of the curved section intersects the inner side of the smooth section The distance between the points is 15.625≤L≤31.25, taking L=16mm. After the determination of the above parameters is completed, the 8mm steel plate or strip is processed into a cold rolling mill or a press bending machine.

Example Embodiment

Example 2:

The parameters of the hot-rolled angle steel and the values ​​of the bent ends are the same as in Example 1. When the V-section member and the hot-rolled angle steel are restricted in connection, the V-section and the hot-rolled angle steel are connected by fillet welds, which can appropriately reduce the smooth section of the V-section. Length B, take B=23mm, and then connect the fillet weld with the hot-rolled angle steel. The fillet size is 7mm. After the above parameters are determined, the 8mm steel plate or strip is processed by a cold rolling machine or a press bending machine. .

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Abstract

The invention relates to a method for reinforcing a transmission angle steel tower, in particular to the method for reinforcing the angle steel of a transmission line steel tower in power equipment. A layer of V-shaped section component is fixed outside the angle steel of the transmission angle steel tower and comprises smooth sections and a curved section, wherein B represents the length of the smooth section, R1 represents the inner arc radius of the curved section, R2 represents an outer arc radius, L represents a distance between the top of the curved section and an inner cross point of the smooth sections, t represents the section thickness of the V-shaped section component, and H represents the leg width of the reinforced hot-rolled angle steel. The curved section of the V-shaped section component is determined by the following conditions: R1 is equal to a difference obtained by subtracting x from t, wherein x is equal to 1 to t-1; R2 is equal to the summation of R1 and t; and a distance between the top of the curved section and the inner cross point of the smooth sections meets the condition that L is more than ore equal to one eighth of H and less than or equal to a quarter of H. Through the scheme, the steel tower can be reinforced under the condition of being electrified to guarantee the normal running of actual lines and improve the section stability of the hot-rolled angle steel.

Description

technical field The invention relates to electric power equipment, in particular to a reinforcement method for a power transmission angle steel tower in the electric power equipment. Background technique At present, my country's transmission line towers with a voltage level of 500kV and below are mostly designed with hot-rolled angle steel. The 220kV transmission line was gradually formed in the late 1970s. Many hot-rolled angle steel transmission angle steel towers have been in operation for more than 30 years. When the transmission angle steel tower When the actual use conditions cannot be met, that is, the load under the actual use conditions is applied to the transmission angle steel tower, which will cause some rods to exceed their design bearing capacity, resulting in fracture and collapse events, which will affect the safety of power transmission. Before 1990 my country's transmission line towers adopt the safety factor method, and the structural design after 1990 adopt...

Claims

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Application Information

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IPC IPC(8): E04G23/02E04H12/08
Inventor 韩军科杨靖波杨风利李清华段叔宁
Owner CHINA ELECTRIC POWER RES INST
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