On-site Welding Reinforcement Method for Angle Steel Tower Legs of Transmission Lines

Abstract

The invention discloses a method for field welding and strengthening of a power transmission line steel angle tower leg. In terms of a ZGU (7727) 110 kilovolt double-loop straight line tower type, a new steel angle tower leg is welded and attached to the surface of an original component in a covering mode by the adoption of a welding mode for strengthening, so that the defects existing in an existing steel angle tower leg strengthening method are avoided; newly added steel angles are directly connected together with the original component through a welded connection mode, firm metallurgical bonding is formed, tapping processing is not needed, intensity weakening hidden danger caused by tapping is avoided, and strengthening security is improved. The welded connection technology is adopted, metallurgical bonding is carried out on strengthening steel angles and original steel angles, the secondary stress phenomenon caused by bolt force transfer is avoided, and the strengthening effect can be improved to the maximum degree. The welded lap joint technology is adopted in the strengthening method, special-shaped plates are reasonably selected to connect and strengthen principal materials and tower leg sleeve plates, and therefore the strengthening steel angles can be easily arranged.

Description

technical field [0001] The invention relates to a field welding reinforcement method for angle steel tower legs of a power transmission line. Background technique [0002] In overhead power transmission, the transmission wires are erected on the tower with insulators and fittings, so that the wires are kept at a certain distance from the ground and buildings. Compared with cable power transmission, overhead power transmission has the advantages of less investment and convenient maintenance and repair, so it has been widely used. For overhead lines with higher voltage levels, iron towers with strong load bearing capacity, small footprint and long service life are generally selected as supports. However, due to the design defects of some types of old lines, there are shortcomings in the design of the wind load and anti-icing ability, and there is a tower collapse accident during use, which needs to be reinforced. [0003] Take the ZGU2 (7727) 110kV double-circuit linear towe...

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Problems solved by technology

With this method, there is a stress hysteresis phenomenon in the newly added components, and there is a secondary force phenomenon in the entire composite reinforcement, which has an adverse effect on the overall force of the tower.

[0008] (3) At the leg of the angle steel tower, there is a connection structure between the main material, the oblique material and the shoe plate. The shape is complex and the number of bolts is large. When arranging reinforcements, the reinforcement position is often limited, which brings great difficulty to the reinforcement.

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