| 摘要 |
Disclosed is a seismic isolation device including a tabular base board (2) having curved convex protrusions and a smooth sliding plate (3) placed in such a way that a sliding contact surface thereof is made to abut the curved convex protrusions of the base board. In the seismic isolation device, an apparent friction coefficient (µ) of only a high-friction portion on a sliding contact surface of the sliding plate with which the curved convex protrusion (2a) of the base board is in contact at rest initially after installation is made higher than the apparent friction coefficient of a sliding surface as a portion other than the high-friction portion. Accordingly, the seismic isolation device is not swayed by minor vibrations such as mechanical vibrations, automobile traffic vibrations, and minor earthquakes and the base board and the sliding plate are enabled to start to slide when an earthquake of the seismic intensity of weak 5 or more occurs.
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