| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a straining jack device capable of straining a PC steel bar even in a narrow work space by reducing a dead space while hardly causing distortion. <P>SOLUTION: A straining jack device comprises: a center hole type jack body 11 with a through-hole 12 formed in its center; a piston 13 fitted into the jack body 11 so that it can be reciprocated; a tension nut 14 inserted into the through-hole 12 and connected to a PC steel bar 5; and a nut turning member 15 fitted to a fixing nut 32 screwed to the PC steel bar 5. A locking part 12c for locking the tension nut 14 from a bottom part 11a side is formed in the through-hole 12 of the jack body 11. A large diameter nut part 14b locked to the locking part 12c and a small diameter nut part 14a arranged on a structure 30 side of the large diameter nut part 14b are formed in the tension nut 14. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
