A kind of super-large diameter steel strand for mine anchor cable and its manufacturing method

Abstract

The invention relates to a super-large-diameter steel strand for a mine anchor cable and a manufacturing method thereof. The steel strand adopts a 1×19-wire Waringon structure, 19 wires are twisted at one time, and the twist distance is 13.5 times. The diameter of the wire is 7.74mm, the diameter of the outer thick wire is 8.01mm, the diameter of the outer thin wire is 6.07mm, the diameter of the inner wire is 7.43mm, the nominal diameter of the steel strand is 34.6mm, and the upper deviation of the nominal diameter is +0.40 mm, the lower deviation of the nominal diameter is ‑0.15mm; the manufacturing method includes: selection of wire rods → inspection, testing → pickling, phosphating → inspection → drawing → semi-finished product inspection, testing → stranding → stabilization treatment → layer winding → Finished product inspection and testing → packaging → storage. The invention makes the measured diameter of the twisted steel strand reach 34.8mm through four kinds of diameters of wires, and the structure of the steel strand is tight and not loose, which meets the size requirement of the super-large diameter steel strand.

Description

technical field [0001] The invention belongs to the technical field of mining steel strands, in particular to a super-large diameter steel strand for mining anchor cables and a manufacturing method thereof. Background technique [0002] In recent years, with the continuous exploitation of mine resources, more coal mines have entered the stage of deep mining. The deep mining of mines increases the instability of surrounding rock and the difficulty of supporting, which brings hidden dangers to the safety of mine production. The deep mining also makes the construction environment and other working conditions extremely complicated. , clearly stipulates the requirement to strengthen the roadway support of rockburst mines, and requires the reasonable selection of roadway support forms and parameters, and proposes that "when the roadway with thick coal seams is tunneled along the bottom support and the top coal is selected for anchor bolt and cable support, ... the diameter of the ...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no special industry standard for mining steel strands. The national standard GB / T5224-2014 "Steel Strands for Prestressed Concrete" is applicable to mining steel strands, but in the national standard, 1×19W structural steel strands The maximum diameter of the product is 28.6mm. Products with a diameter above this are not involved in relevant product standards at home and abroad, and are blank products.

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