Novel steel strand

Abstract

The invention provides a novel steel strand which comprises a body composed of one center wire and one edge wire. The center wire is a solid polished steel wire, the edge wire is an internally hollow annular steel wire, and the center wire can be just inserted into the center of the edge wire. The novel steel strand is characterized in that the surface of the body is provided with a plurality of continuous protruding ribs, the protruding ribs are in a weave shape or a fold line shape in the moving orientation, and 2-4 protruding ribs are arranged. The novel steel strand has the advantages that by the adoption of the technical scheme, the problems of slippage ad retraction between the center wire and the edge wire of the steel strand are solved, good mechanical performance of the steel strand is maintained, the steel strand body is made to have higher cohesive force, sliding is not generated easily, and the quality of prepressed concrete components is improved; meanwhile, the protruding rids are additionally arranged on the basis of the polished steel wire, the bond stress on cement is enhanced, and safety and strength in the using process are improved.

Description

technical field [0001] The invention relates to a novel steel strand. Background technique [0002] Due to its high strength, prestressed steel wire has become an important material in the construction of bridges and railways. When using prestressed steel wire, it must ensure the gripping force with cement and other wrappings, so that the role of prestressed steel wire can be fully exerted during use. [0003] The existing prestressed steel strands are basically composed of central wires and side wires. The disadvantage is that the cross-sections of the center wires and side wires are circular, the pores between them are large, and the contact area between steel wires is small. The frictional force generated by the effective contact is small, and it is very easy to cause the edge of the core wire to slide and retract, resulting in a reduction in the stress of the core wire or a complete loss of stress, which restricts the quality and life of the prestressed steel strand. At ...

AI Technical Summary

Problems solved by technology

[0003] The existing prestressed steel strands are basically composed of central wires and side wires. The disadvantage is that the cross-sections of the center wires and side wires are circular, the pores between them are large, and the contact area between steel wires is small. The frictional force generated by the effective contact is small, and it is very easy to cause the edge of the core wire to slide and retract, resulting in a reduction in the stress of the core wire or a complete loss of stress, which restricts the quality and life of the prestressed steel strand. At the same time, many existing prestressed strands The surface of the stress steel wire is smooth, and the grip force is insufficient, which makes the fit effect between the concrete and the steel strand bundle poor, which can easily lead to accidents

Images