| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the efficiency of inspection work without reducing fire resistive performance by means of the structure in which the cover of fire resistive covering material can be easily removed. <P>SOLUTION: In a base isolation device, a laminated rubber 2 is disposed between an upper column 4A and a lower column 4B, the laminated rubber 2 being formed by alternately laminating a steel plate and a rubber sheet. A fire resistive covering structure for the base isolation material comprises: a plurality of ring members 11 arranged surrounding the periphery of the side surface of the laminated rubber 2 at predetermined vertical intervals; a compressive spring member 12 for vertically connecting the ring members 11 to each other; a deformable fire resistive blanket 5 which is arranged covering the periphery of the laminated rubber 2 at the outer periphery side of the ring members 11, and which is locked into the ring members 11 by fixing bolts. In the fire resistive covering structure for the base isolation material, the ring member 11 disposed at top is in contact with the upper column 4A, and the ring member 11 disposed at bottom is in contact with the lower column 4B. <P>COPYRIGHT: (C)2012,JPO&INPIT |
