MAINTENANCE METHOD OF CROSSARM OF STEEL TOWER

摘要

PROBLEM TO BE SOLVED: To obtain a maintenance method of a crossarm of a steel tower capable of safely replacing a part of a structural member of the crossarm without temporarily moving a power transmission line.

SOLUTION: A maintenance method of a crossarm of a steel tower comprises: a first step of fastening a hook member 31 for hooking a pair of wires 51 to leading end portions of a pair of crossarm main materials 13 that extends in a lateral direction from a tower body 11 of a steel tower 1 and holds a power-transmission line PL; a second step of installing the pair of wires 51 between the hook member 31 and the tower body 11; a second sub-step of, at that time, interposing a pair of tensile force adjusting devices 52 capable of manually adjusting tensile force of the pair of wires 51 between ends of each of the pair of wires 51; a third step of removing fastening bolts for fastening the pair of crossarm main materials 13 and crossarm hanging members 15 to a crossarm leading end plate 14 while individually and manually adjusting each tensile force of the pair of wires 51 by the pair of tensile force adjusting devices 52; a fourth step of subsequently replacing the crossarm hanging members 15 and the crossarm leading end plate 14; and a fifth step of removing the pair of wires 51 together with the pair of tensile force adjusting devices 52.

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