| 摘要 |
PROBLEM TO BE SOLVED: To definitely support a horizontal force acting to a pile head portion during a great earthquake by maintaining a coupling state between the pile head portions of foundation piles and a foundation framing body almost to a pin connection (bending resistance is zero) regardless of an extent of the axial force. SOLUTION: A coupling hole 3 is formed on the bottom surface of the foundation framing body 1, and the pile head portion 4 of the foundation pile 2 is inserted to the inside of a coupling hole 3. Between the upper end wall 4a of the pile head portion of the foundation piles and the bottom wall 3a inside the upper end hole mutually facing each other, an elastic body 5 is interposed which is combined only with one wall 4a of the walls 4a, 3a opposite to each other and not combined with other wall 3a. Between the facing surfaces of the elastic body 5 at the non-combined side and the wall 3a, a slip plate 6 is interposed which permits the relative slide in the horizontal direction of the facing surfaces. Between the outer peripheral wall 4b of the pile head portion of the foundation pile and the inner peripheral wall 3b of the coupling hole, an elastic body 8 or a viscous body 9 is interposed which is coupled only to one of the peripheral wall 4b among the facing peripheral walls 4b, 3b and is not coupled to the other peripheral wall 3b.
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