| 摘要 |
PROBLEM TO BE SOLVED: To provide a pile foundation structure that is configured to prevent sharp decrease of yield strength in a hollow prefabricated pile due to a great earthquake while performing pile foundation construction to build up the hollow prefabricated pile in a drilling hole.SOLUTION: At least a portion of a pile in a pile foundation becomes a double annular double pile structure comprising an outer pile 1 of a hollow prefabricated pile and an inner pile 6 of the hollow prefabricated pile. A spacer 7 is installed between the outer pile 1 and the inner pile 6, and a gap of a constant interval is provided. Also, an excavation intra-hole including this gap is filled with a mixture of a pile boundary fixative solution and an excavation soil and sand 4, and thereby the pile foundation structure is formed in which the outer pile 1 and the inner pile 6 are integrated.SELECTED DRAWING: Figure 1 |
