Patent ID: 7585562
Filing Date: 2009-09-08
Classification: D07B,E04C,Y10T

Abstract:
1. A prestressing strand comprising: a plurality of wires, each having an outer peripheral face; wherein said plurality of wires includes a core wire, and surrounding wires twisted around said core wire; wherein each of said plurality of wires has an individual outermost resin coating formed individually about said outer peripheral face thereof and not about any other of said plurality of wires, such that each of said outermost resin coatings of said plurality of wires is independent of said outermost resin coatings of the other of said plurality of wires so that said surrounding wires having said outermost resin coatings thereon can be untwisted from said core wire having said outermost resin coating thereon; wherein each of said surrounding wires has a second resin coating at only a surface layer part under a twisted state, such that each of said surrounding wires has a double resin coating only at said surface layer part thereof under the twisted state; and wherein, for each of said surrounding wires, said second resin coating thereof is formed inwardly of said outermost resin coating thereof.