| 摘要 |
PROBLEM TO BE SOLVED: To obtain a tension device for prestressing wire permitting the tension work even in a narrow place by pulling out the end of the prestressing wire with an actuator while bending the wire instead of a straight line. SOLUTION: A prestressing wire 6 is inserted in a sheath 2a provided in a concrete product 2, and one end of the prestressing wire 6 is fixed to an anchoring device 3 supported at one end of the concrete product 2. The other end of the prestressing wire 6 is connected to an actuator 9 through the anchoring device 13 supported by the other end of the concrete product 2 and a plurality of blocks 21, and a tension force is given to the prestressing wire 6 by the actuator 9. Both end faces 21a of the block 21 is sloped to opposite side relative to the center shaft line of a wire insertion hole 23, and the inner diameter of both the end portions 22 of the wire insertion hole 23 is enlarged. |
