RESIDUAL MAGNETIC REDUCTION METHOD OF CONSTITUTION MATERIAL OF STEEL FRAME STRUCTURE

PROBLEM TO BE SOLVED: To enable anyone to perform the reduction of the residual magnetism of structural material by a simple method by striking the structural material of a deck plate or the like constituting a steel frame structure by a human hand or a hitting device. SOLUTION: The residual magnetism A of a constitution material 10 is reduced by striking the plate face of the constitution material 10 of a deck plate or the like constituting a steel frame structure by a human hand or a hitting device 40. In this method, in the case of the human hand, a hitting tool such as a hammer may be used, the hitting device 40 comprising a hitting part 41, a drive part 42 for driving the hitting part 41 and an operation part 43 for controlling the drive part 42 may be used. Therefore even a general worker without expert knowledge can reduce the residual magnetism A of the constitution material 10 of the steel frame structure by a simple method.