1*7I prestress wire

Abstract

The invention relates to a 1*7I prestress wire, the prestress wire is composed of a core wire at the centre and six side wires at outer layer, the surface of the core wire is provided with four spiral grooves being parallel to each other and rounding in heliciform form, and the surface of each side wire is provided with four spiral ribs being parallel to each other and rounding in heliciform form. The prestress wire has the advantages of increasing the bonding stress between the prestress wire and the concrete, solving the slippage retraction between the core wire and the side wire, keeping good mechanical property for the prestress wire and improving the quality of the prestressed concrete member.

Description

technical field [0001] The invention relates to the technical field of prestressed steel used in the construction industry, in particular to a 1×7I prestressed steel strand used in a prestressed concrete component. Background technique [0002] In the prestressed concrete components in the construction industry, in order to increase the mechanical properties of the components such as compression resistance and earthquake resistance, most of them use prestressed steel wires or steel strands as reinforcements. The quality of the gripping force between its reinforcement and concrete is an important factor to determine the quality of prestressed concrete components. [0003] The prestressed concrete members of the present technology use smooth round steel wires or single regular deformed steel wires or steel wires with symmetrical notches or steel strands twisted from the above steel wires as the main reinforcement of the prestressed concrete members, and there are the following...

AI Technical Summary

Problems solved by technology

[0005] 2. The steel strands twisted by smooth round steel wires only rely on the non-effective contact friction between smooth round steel wires to generate back pressure stress on concrete members, and it is very easy to cause the edge of the core wire to slip and retract. As a result, the stress of the core wire is reduced or even lost, which restricts the quality and life of the prestressed concrete member, and reduces the binding force between the steel strand and the concrete;

[0006] 3. A single regular deformed steel wire or a steel wire with symmetrical notches or a steel strand twisted from the above steel wires has a small grip on the concrete, especially the stress concentration of the former is serious, which leads to the quality of prestressed concrete components. poor

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