Inclined guy cable stretching torsion-proof jack

Abstract

The invention discloses a tension anti-torsion jack of a stayed cable, comprising a support. No less than two oil cylinder jack are evenly arranged on the support. A piston rod of the oil cylinder jack is connected with a raising plate. A first clamping device for a steel strand is arranged on the raising plate and a second clamping device for the steel strand is arranged in the support. The oil cylinder jacks moves simultaneously, and tension aim is achieved by shifted clamping the steel strand of the stayed cable using the first and the second clamping devices when the stayed cable tends, so torsion of the stayed cable is avoided effectively. An raising momentum system is broken up the whole into parts and an anti-torsion system is formed depending on the raising device, so torsion of the stayed cable is avoided in tension process; working height of the stayed cable system is reduced largely by closely combining a frame brace used in stayed cable tension with the jack, and requirement for space of the stayed cable tension is reduced largely.

Description

technical field [0001] The invention belongs to a cable-stayed cable and a steel strand tensioning construction device, in particular to a cable-stayed cable tensioning jack. Background technique [0002] At present, the tensioning construction of stay cables all adopts through-hole jacks to complete. For stay cables made of low-relaxation high-strength steel wires, filled with anti-corrosion grease, and covered with high-density polyethylene. Although this type of stay cable is called a parallel steel wire stay cable, in fact the steel wires inside the finished cable are not parallel, but there is a torsion angle of about 3°. Due to the existence of the torsion angle, the stay cable is When tensioning, a reverse torsional force will be generated. After the torsional force reaches a certain level, it will be released at the tensioning end. This force will drive the jacking device of the tensioning jack to rotate together, which will damage the jack and also easily cause saf...

AI Technical Summary

Problems solved by technology

Although this type of stay cable is called a parallel steel wire stay cable, in fact the steel wires inside the finished cable are not parallel, but there is a torsion angle of about 3°. Due to the existence of the torsion angle, the stay cable is When tensioning, a reverse torsional force will be generated. After the torsional force reaches a certain level, it will be released at the tensioning end. This force will drive the jacking device of the tensioning jack to rotate together, which will damage the jack and also easily cause safety accidents.

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