Tensioning system for cables in prestressed concrete

摘要

A system for tensioning stranded or wire cables in prestressed concrete comprises an anchoring head having holes in which are anchored the strands or wires. The anchoring head has a ring in screw-threaded engagement with an exterior surface of the head for providing a reactive support for the anchoring head. An intermediate member is releasably fixed to the anchoring head by rods which extend through holes in the intermediate member and are in screw-threaded engagement with the anchoring head. The intermediate member also has a screw-threaded exterior for engagement with the ring to allow the ring to provide a reactive support for the intermediate member at intermediate stages in a tensioning operation. The intermediate member is releasably connectable to a tensioning jack thus allowing the jack and the intermediate member to be removed from the anchoring head once tensioning is complete.