BASE ISOLATION METHOD FOR EXISTING BUILDING

摘要

PROBLEM TO BE SOLVED: To provide a base isolation method for an existing building allowing construction of a base isolated building that prevents reduction of the floor area due to a base isolation pit and allows the site to be used effectively, without crossing a site boundary.SOLUTION: A base isolation method for an existing building comprises the steps for: separating the existing building into an upper structural body 2 and a lower structural body 3; casting additional concrete on an outer column 30 erected along an external wall of the lower structural body 3; inserting a seismic isolator 4 between the external column 30 of the lower structural body 3 and an external column 20 of the upper structural body 2; and moving only the upper structural body 2. The external column 30 of the lower structural body 3 and the external column 20 of the upper structural body 2 are separated at a location above a ground surface GL.