Mining ultrahigh-extension prestressed steel strand and manufacturing method thereof

Abstract

The invention belongs to the field of production processes of steel strands for prestressed concrete, and relates to a mining ultrahigh-extension prestressed steel strand and a manufacturing method thereof. The mining ultrahigh-extension prestressed steel strand comprises a central wire, nine inner-layer wires and nine outer-layer wires, wherein the central wire, the inner-layer wires and the outer-layer wires are of seal type structures; steel wires on the same layer and between the layers are closely attached one by one and make contact with one another in a linear mode; the mining ultrahigh-extension prestressed steel strand is characterized in that the nominal diameter of the central wire ranges from 6.1 mm to 6.3 mm, the nominal diameter of each inner-layer wire ranges from 3.10 mm to 3.15 mm, the nominal diameter of each outer-layer wire is 5.5 mm and 5.6 mm, and the nominal diameter of the twisted steel strand is 21.8 mm. According to the process parameters of the steel strand, the tensile strength is larger than or equal to 1860 MPa, and the ductility is larger than or equal to 7.0%. The manufacturing method comprises the following steps of wire rod selection, inspection and testing, acid pickling and phosphorization, drawing, inspection and testing, twisting, stabilization treatment, layer winding, inspection and testing, packaging, and warehousing.

Description

technical field [0001] The invention belongs to the field of production technology of steel strands for prestressed concrete, and relates to the production technology of steel strands for mines, in particular ultra-high elongation prestressed steel strands for mines and a manufacturing method thereof. Background technique [0002] As the country's demand for coal continues to increase, more coal mines in our country have entered into deep mining. The increase of mine depth increases the instability of the surrounding rock and the difficulty of support, and the mine pressure is strong, and the deformation of the roadway increases significantly, which brings hidden dangers to the safe production and operation of the mine. Therefore, in order to strengthen the support, the current mine anchor cables mostly use large-scale prestressed steel strands with a structure of 19 wires. [0003] The 19 wire structure ultra-high extension steel strand developed by this project is used fo...

AI Technical Summary

Problems solved by technology

The increase of the depth of the mine increases the instability of the surrounding rock and the difficulty of support, and the pressure of the mine is strong, and the deformation of the roadway increases significantly, which brings hidden dangers to the safe production and operation of the mine.

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