Oiles Industry Co., Ltd.

Tadaaki Takase

Wataru Abe

Toshiyuki Kitta

Akira Sugafuji

Hiroshi Kurimoto

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.

Metallic sheath for posttensioning method

A sintered self-lubricating article having great oxidation resistance, high dimension-stability and high wear resistance at elevated temperatures without assistance of any other lubricants and consisting essentially of 5 to 10% by weight of tin, 8 to 40% by weight of zinc, 5 to 15% by weight of graphite and the balance being copper.

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Fujisawa, Japan

Tadaaki Takase