| 摘要 |
PROBLEM TO BE SOLVED: To provide a tower crane which easily re-tightens bolts attached to the tower crane, and to provide a re-tightening method.SOLUTION: A tower crane 1 includes: a crane post 10; a revolving bearing 20 having an inner ring 21 fixed to the crane post 10 and an outer ring 22 which is provided so as to rotate relative to the inner ring 21; a crane body 30 fixed to the outer ring 22 by bolts 26; and a tool contact part 40 which is detachably supported by the crane post 10. The tool contact part 40 is formed so that a tool W comes in contact with the tool contact part 40 when the crane body 30 is revolved in a state where the tool W is engaged with a head part of one of the bolts 26.SELECTED DRAWING: Figure 1 |
