Metallic sheath for a posttensioning method provided with rust proofing treatment
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 10, 1985
Grant Date -
N/A
app pub date -
Sep 1, 1983
filing date -
Sep 4, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A metallic sheath for a posttensioning method wherein an outer peripheral surface or outer and inner peripheral surfaces thereof is (or are) coated with phosphate layer (or layers) and plastic resin layer (or layers) thereupon and preferably further coated with a solid lubricating layer upon the inner peripheral surface of the sheath. The phosphate layer of the outer peripheral surface protect the metallic sheath from corrosion by negative ion within concrete, while, on the other hand, that of the inner peripheral surface prevents the electrochemical corrosion between the inner peripheral surface of the sheath and tendon. Moreover, if a solid lubricating, layer is provided at the inner peripheral surface of the sheath, the sliding friction between the metallic sheath and tendon can be decreased so that prestressed force can be increased as much.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 1 Citation Count
- E04C Class
- 0 % this patent is cited more than
- 40 Age