L-SHAPED DOUBLE-END BOLT MANUFACTURING METHOD, L-SHAPED DOUBLE-END BOLT, AND FORMWORK STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide an L-shaped double-end bolt manufacturing method in which the radius of curvature of a folded part can be set small, and a screw part can be formed to a root of the folded part of, an L-shaped double-end bolt, and a framework structure using the L-shaped double-end bolt.;SOLUTION: A bolt stock 20A having a pair of screw parts 21 and 22 on both ends of a metal bar with an interval therebetween is manufactured, and both screw parts 21 and 22 of the bolt stock 20A are placed on a supporting member 32 which is turnably supported to a pair of pivotably supported shafts 31 parallel to each other. A bending tool 35 is pressed from the top against the bolt stock 20A between the screw parts 21 and 22 to allow the screw parts 21 and 22 to slide in the axial direction to the supporting member 32, and a folded part 25 is formed between the screw parts 21 and 22 while turning the screw parts 21 and 22 respectively together with the supporting member 32 around the pivotably supported shafts 31.;COPYRIGHT: (C)2003,JPO