| 摘要 |
PROBLEM TO BE SOLVED: To easily attach or detach a jacking shaft member and a rotary member, and jacking shaft members without requiring any experience. SOLUTION: A jacking device is provided with a protection part 5 for screwing and retaining a jacking shaft member so that it can travel freely in a jacking direction, and a jacking part for jacking the jacking shaft member, and forms a management installation hole at a jacking track where a plurality of jacking shaft members are jacked while they are screwed and connected one another. The retention part is provided with a rotary member 27 with a screw part 27a that is screwed to one end side of the jacking shaft member concentrically and a drive device 28 for driving and rotating the rotary member 27 in forward and backward directions are provided, the rotary member 27 and the jacking shaft member 27, or the jacking shaft members are attached or detached by the forward and backward rotation of the rotary member 27, and a power transmission part 48 for transmitting the drive force of the driving device 28 to the rotary member 27 is provided with a slide mechanism 44 for allowing slide travel in the direction of the axis center of the rotary member 27 over length required for attaching or detaching the rotary member 27 and the jacking shaft member, or the jacking shaft members while transmitting drive force to the rotary member 27.
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