| 摘要 |
PROBLEM TO BE SOLVED: To provide a pile head base-isolated structure in which the entire pile foundation is integrally displaced in an earthquake, and for which execution time and labor can be reduced, a construction period can be shortened and the cost can be lowered.SOLUTION: In a base-isolated structure, an upper structure 4 is supported through a seismic isolator 3 at heads of a plurality of disposed foundation piles 2. In the foundation pile 2, a connection member 15 comprising an earth pressure wall 13 and a horizontal connection member 14 is formed between outer pile heads arranged on an outer periphery and the connection member 15 is installed so as to surround an inner pile 2b arranged on an inner side. Thus, since the entire foundation piles 2 behave uniformly as one pile group utilizing earth pressure force of ground surrounded by the connection member 15 and are displaced together in the same direction without being displaced variously during an earthquake, a pile head base-isolated structure capable of substantially reducing foundation work, shortening a construction period and lowering costs is obtained. |
