| 摘要 |
PROBLEM TO BE SOLVED: To safely connect a tubular member easily and surely with excellent efficiency regardless of the weather, the size of the tubular member or the like without working the tubular member at an open-air field. SOLUTION: Projecting sections 10 formed in male members 1 can be inserted and retracted to and from fitting sections 9 formed in female members 2 in the joint for the steel tower, a plurality of circumferential projecting strips 11 at intervals in the circumferential direction are formed on the outer circumferences of the projecting sections at a plurality of stages, and a plurality of engaging projecting sections at circumferential intervals permitting the projection and retraction of the circumferential direction 11 are formed on the inner circumferences of the fitting sections while these engaging projecting sections are formed at a plurality of stages at intervals equal to the axial thickness of the circumferential projecting strips 11.
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