Steel materials for use with prestressed concrete
AssigneeSumitomo Electric Industries, Ltd.
InventorsKanji Watanabe, Mikio Mizoe
Life of this patent
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Abstract
A prestressing steel material for use with concrete that is prestressed by posttensioning is disclosed. Said steel material is unbonded from the concrete. The prestressing steel material is composed of a steel member sheathed with a foamed synthetic resin tube. The wall thickness of the synthetic resin tube is at least 300 microns, more preferably, more than 500 microns. In the case that the steel member is a strand composed of a plurality of twisted steel wires, the spiral grooves of the strand are first filled with a resin and the strand together with the resin sheathed with the foamed synthetic resin tube.
Claims7
An elongated prestressing steel material embedded in prestressed concrete, comprising:
- an elongated ungreased steel member, and a foamed synthetic resin tube sheathing bonded to said steel member and not bonded to said concrete.
An elongated ungreased prestressing steel material embedded in prestressed concrete, comprising:
- a steel strand having a plurality of twisted steel wires, said steel strand having a plurality of spiral grooves formed therein;
- a resin filling said grooves;
- and a foamed synthetic resin tube sheathing bonded to said strand and not bonded to said concrete.
Dependencies are inferred from the claim text.