| 摘要 |
A jack for tensioning cables in prestressed concrete structures, is made to react on the distribution plate with one member of a cylinder-piston system, the other member engaging the strands or wires of the cable to tension them by the lengthening of such cylinder-piston system. The strands pass through the variable-volume chamber of the cylinder-piston system inside guide pipes sliding in one of the members and engaging the other. |
