Textiles: spinning – twisting – and twining – Strand structure – Covered or wrapped
Reexamination Certificate
2011-01-04
2011-01-04
Hurley, Shaun R (Department: 3765)
Textiles: spinning, twisting, and twining
Strand structure
Covered or wrapped
Reexamination Certificate
active
07861507
ABSTRACT:
In one aspect, the present disclosure relates to a high-strength prestressing strand having a seven-wire structure in which one core wire and six outer wires are stranded. An external diameter of the strand is from 15.0 mm to 16.1 mm, a total cross-sectional area of the strand is 135 mm2or more, and a load at 0.2% permanent elongation is 266 kN or more. A relaxation value measured after a 1000-hour relaxation test is 2.5% or lower and a diameter of the core wire is 5.35±0.3 mm and a diameter of the outer wires is 5.15±0.25 mm. The core wire and the outer wires each have a composition of at least 0.90% carbon. The prestressing strand is manufactured by stranding the core wire and outer wires, giving a stretching treatment, and giving a bluing treatment at a temperature of 380° C. or more and 430° C. or less after or at the same time with the stretching treatment.
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Ichiki Takashi
Maekawa Tomoya
Niki Toshihiko
Hurley Shaun R
Osha & Liang LLP
Sumitomo (SEI) Steel Wire Corp.
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