MAGNETIC-FIELD SHIELDING STRUCTURE OF BUILDING

PROBLEM TO BE SOLVED: To contrive shielding from a magnetic field other floors, and to pre vent an electromagnetic interference from occurring by using for supports com municated with the upper and lower floors of a floor, on which a transformer is placed, a nonmagnetic stainless steel material or a nonmagnetic high manga nese steel material having specific strength. SOLUTION: Transformers 3 are installed onto the basement 1 of a building 2, permalloy plate materials are laid on the ceiling, side walls and floor faces of the basement 1, and the whole basement of formed in magnetic shielding structure. Only the supports 2a1 is a first floor F1 on the ground is constituted of nonmagnetic stainless steel, nonmagnetic high manganese steel or the like having 0.1% strength displaying 235N/mm or more, and all supports of floors upper than a second floor F2 on the ground are composed of normal steel frames. Consequently, a magnetic field generated in the transformers 3 is captured while using the whole basement 1 as a magnetic circuit, a magnetic field captured by the supports 2a0 can be interrupted by the supports 2a1 . and a leakage field to each floor F1 -F10 placed on the ground can be reduced remarkably. Accordingly, an electromagnetic interference based on a magnetic field propagated on the steel frames of the building can be prevented.