STEP BOLT FOR STEEL TOWER FOR POWER TRANSMISSION LINE

摘要

PROBLEM TO BE SOLVED: To improve climbing and descending steel towers by forming many projected portions of desired shapes or the surfaces of step positions thereby improving the non-slip effect. ;SOLUTION: A step bolt 1E comprises a threaded portion 2E attached to a tower leg H and a step portion 4E used for gripping by hand or stepped by the foot, and the whole bolt is formed by a conductive metal material in one united body. And on the surface of each step portion 4E, a number of projected portions 9E to 9E are arranged continuously in the axial direction at predetermined intervals which have a hexagonal star-shaped cross section with the round portions slightly cut out for creating the hexagonal section. And a flange-shaped contact piece 10E is stuck out at the boundary of straight axis portion of the step bolt 1E. As a result, anti-slip function can be given effectively, and a contact area between worker's glove and an extremely cold step bolt can be reduced to a minimum, so that climbing and descending the steel tower can be simplified and made safer thereby improving the workability.;COPYRIGHT: (C)1998,JPO