This multi-layered sliding fireproof cover of rubber bearing for base isolated building structure is composed of calcium silicate ring boards cut in around slices and piled up around rubber bearing. Each ring board can slide smoothly according to the horizontal deformation of rubber bearing. From the horizontal loading test of the rubber bearing, it is confirmed that the sliding fireproof cover did not change the restoring force characteristic of the bearing at all. Also the horizontal loading test of the rubber bearing with fireproof cover are done before and after 3-hours heating test (specified by JIS A 1304). Comparing the result, it was shown that the restoring force characteristic did not change at all and fireproof cover had worked perfectly to the heating test of the bearing. It took several minutes for setting and removing of the fireproof cover, and this cover could be handled easily.
