Metallic sheath for posttensioning method
US4577443A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1982 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Nov 12, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04C5/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a prestressed concrete structure executed by posttensioning method, a metallic sheath having an inner peripheral surface thereof in sliding contact with a tendon coated with a solid lubricating coating including polytetrafluoroethylene (PTFE). By the use of this metallic sheath, the sliding frictional resistance produced between the metallic sheath and tendon when the tendon is subjected to tensioning operation is considerably decreased to increase the prestressing force introduced into the structure accordingly. The solid lubricating coating is excellent in flexibility and contact properties, and good characteristics of coating are imparted to the sheath.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.