| 摘要 |
PROBLEM TO BE SOLVED: To provide a pile foundation structure which can exert excellent earthquake resistant performance and base-isolation performance. SOLUTION: According to the pile foundation structure, a footing 6 is borne by a pile head which is an upper surface of a foundation pile, via a pin-connecting means and a drawing resistance applying means 20. The pin-connecting means connects the pile head and the footing 6 to each other in a relatively rotatable manner. The drawing resistance applying means 20 fixes a plurality of reinforcements 21 to the foundation pile such that their upper end portions 21a protrude from the pile head. Then, a plurality of reinforcement insertion passages 22 which each have a inner diameter D larger than a reinforcement diameter d, are formed in the footing 6 in a vertically penetrating manner, and the reinforcements 21 are inserted into the respective reinforcement insertion passages 22 such that the upper end portions 21a of the reinforcements 21 protrude from the footing 6. Further, a slipout preventive body 23a is attached to each reinforcement portion 21b protruding from the footing 6, and a spring member 24 is interposed between each slipout preventive body 23a and a footing upper surface 6b. The spring member 24 functions to urgingly bias the footing 6 in a downward direction with respect to the reinforcements 21.
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