SEISMIC ISOLATION DAMPER AND INSPECTION METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a simple and precise inspection method of a seismic isola tion damper that can inspect the joined state of a part of a lead column body and a flange simply and highly reliably by a nondestructive inspection and the seismic isolation damper which is inspected by the method. SOLUTION: When an ultrasonic wave is incident from a flange side on a certain inspection area of a joined part of a lead column body and the flange, if a reflected echo from the joint part is greater than a predetermined threshold, it is judged that a joint defect is detected in the inspection area. In addition, the joined state of the lead column body and the flange of the whole damper is judged from a ratio of inspection areas where joining defects exist to the total areas to be inspected of the presence of joining defects using a method in which when an ultrasonic wave is incident from a flange side on a certain inspection area of a joined part of the lead column body and the flange, if a reflected echo from the joined part is greater than a predetermined threshold, a joining defect is detected in the inspection area. COPYRIGHT: (C)2004,JPO