Galvanized steel strands are usually used for messenger wires, guy wires, core wires or strength members, etc. They can also be used as earth wires/ground wires for overhead power transmission, barrier cables on both sides of roads, or structure cables in building構造。 The commonly used prestressed steel strands are uncoated low-relaxation prestressed steel strands (uncoated steel strand for prestressed concrete), and there are also galvanized ones (galvanized), which are commonly used in bridges, buildings, water conservancy, energy and geotechnical engineering, etc. Unbonded prestressed steel strands (unbonded steel strand or monostrand) are commonly used in floor slabs, foundation engineering, etc.

The control tension force of the prestressed steel strand construction design refers to the tension of the steel strand before the anchor clamp after the prestressing is completed. Therefore, when calculating the theoretical elongation of the prestressed steel strand, the distance between the anchor points at both ends of the steel strand should be used as the calculated length of the steel strand. However, during the prestressing, the controlled tension force of the steel strand is controlled at the jack tool anchor. Therefore, for the convenience of control and calculation, the distance between the anchor points at both ends of the steel strand plus the working length of the steel strand in the tensioning jack is generally used as the calculated length of the theoretical elongation of the prestressed steelストランド。 During the prestressing of the steel strand, most of the exposed part of the steel strand is wrapped by the anchor and jack. The tension elongation of the steel strand cannot be directly measured on the steel strand. Therefore, the tension elongation of the steel strand can only be calculated by measuring the piston stroke of the tension jack. However, the amount of anchor retraction during the entire process of prestressing the steel strand should also be subtracted. The load-bearing capacity of the steel strand should be 4-6 times the total traction force .