| 摘要 |
PROBLEM TO BE SOLVED: To improve earthquake-resistance by connecting the respective heads of an internal pile supporting the vertical load of an upper structure and an external pipe pile provided at the periphery of the pile head thereof through a connection part. SOLUTION: Respective heads of an internal pile 2 supporting the vertical load of an upper structure 6 and an external pipe pile 3 made of a hysterestic damping material or the like formed at the periphery of the pile head are connected to each other by a rigid plate 4, and a rubber body 5 is filled in a gap between the piles 2, 3 to constitute a vibration isolation pile 1. In the pile 1, the vertical load from the structure 6 is supported by the pile 2 both at an usual time and in an earthquake, and the horizontal force from the structure 6 in an earthquake is distributed in accordance with the rigidity ratio of the piles 2, 3. The horizontal force distributed to the pile 3 is transmitted to the ground 7. The horizontal force distributed to the pile 2 head is transmitted to the ground 7 from the pile 3 through the rubber body 5. When a vibration isolation support such as a laminated rubber support is interposed between the pile 2 and the rigid plate 4 instead of the structure, the horizontal force from the structure 6 can be distributed to almost all piles 3. In this way, the internal pile head and the upper structure can be prevented from damages.
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