UP-MOUNTING DEVICE FOR CRANE UPPER STRUCTURAL UNIT

摘要

PROBLEM TO BE SOLVED: To hoist to a height of the same degree a crane upper structure of boom, girder block, etc. even when a height of a strut is shortened as compared with the conventional portal type post. SOLUTION: This up-mounting device for a crane upper structural unit mounts the upper structural unit C of a crane on a lower structural unit D. The device is constituted by four struts 2 vertically provided in a crane assembly site A, a jack up device 3 each installed in this strut, and a plurality of horizontal hoist beams 4 lifted by the jack up device 3 while supporting the upper structural unit C.