Seismic isolation device installation method and the seismic isolation device installation structure of the basic pillars of the existing building

摘要

PROBLEM TO BE SOLVED: To provide a seismic isolation device installation method which can control a vertical distortion angle within a predetermined range and imposes a less economic burden than a conventional method.SOLUTION: A seismic isolation installation method to install a seismic isolation device on a foundation column of an existing building comprises: arranging temporary receiving means, around the foundation column, which temporarily receives a load of the existing building; removing a portion of the foundation column with an upper section and a lower section thereof kept in place in a temporarily- receiving state; arranging a seismic isolation device in a space created by removing the portion between the upper section and the lower section of the foundation column; installing a pre-compression jack between the seismic isolation device and the upper section of the foundation column or between the seismic isolation device and the lower section thereof; transferring the load acting on the temporary receiving means to the seismic isolation device by compressing the seismic isolation device by the pre-compression jack; arranging a supporting body around the pre-compression jack on either an upper face side or a lower face side of the pre-compressed seismic isolation device; removing the pre-compression jack to transfer the load of the existing building to the support body and the seismic isolation device; and removing the temporary support means.