A kind of 1860mpa grade prestressed steel strand and its manufacturing method

Abstract

The invention belongs to the technical field of prestressed steel strands, and relates to steel strands with a structure of 1×19, especially a 1860MPa grade prestressed steel strand and its manufacturing method, including a central wire, six inner wires, six outer wires A layer of thick filaments and six outer filaments, characterized in that: 19 filaments are twisted at the same time, the twist direction is left twist, the twist distance is 386 mm, the diameter of the central filament is 6.62-6.68 mm, and the diameter of the inner filament is 6.12-6.18 mm, the diameter of the outer thick wire is 6.62-6.68 mm, the diameter of the outer thin wire is 4.88-4.94 mm, and the nominal diameter Φ after twisting is 28.6 mm; The gap between the adjacent inner layer wires is 0.25 mm, and the gap between the adjacent outer layer thick wires and outer layer thin wires is 0.23 mm; The layer filaments do not extend beyond the circumscribed circle formed by the strands.

Description

technical field [0001] The invention belongs to the technical field of prestressed steel strands, and relates to steel strands with a structure of 1×19, in particular to a 1860MPa grade prestressed steel strand and a manufacturing method thereof. Background technique [0002] There are 1×19W-Φ28.6mm prestressed steel strands in China, which are mostly used in the field of coal mine support, and the strength levels are 1720 and 1770, while Japan and other countries have extended them to the field of construction engineering, and the strength level reaches 1860 class. However, the domestic existing 1×19W-Φ28.6mm 1860MPa grade steel strand is limited by raw materials, equipment, process design and many other reasons, resulting in a very low yield of steel strand, and even mass production cannot be achieved. [0003] Generally, manufacturers can only increase the strength of 1×19W-Φ28.6mm 1860MPa grade steel strand by increasing the diameter and strength of raw materials. Feiy...

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Problems solved by technology

Therefore, in subsequent mechanical tests, relaxation tests, and when used in concrete structures, the above structure will cause the problem of uneven stress on the outer layer of thick and thin steel wires, and the outer layer of thin wires will bear greater force. Moreover, subject to the influence of the diameter, the breaking force of the outer layer of thin steel wire itself is lower than that of the outer layer of thick steel wire, so this structure will make it difficult to improve the overall breaking force level of the steel strand

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