| 摘要 |
PROBLEM TO BE SOLVED: To provide an under-reamed pile which enables a base enlargement ratio to be increased even if an under-reamed portion is low, and which hardly causes stress concentration. SOLUTION: In this under-reamed pile 100, the under-reamed portion 102, the diameter of which becomes larger than that of a shaft portion 101, is formed on a portion as the bottom of the pile. The under-reamed portion 102 is provided with a gradually-widened portion 102b which is expanded in a funnel shape downward from the shaft portion 101. Additionally, the gradually-widened portion 102b is formed by rotating an arc, in which a center 102c for connecting an upper end to a lower end of a lateral line of the shaft portion 101 is located on the outside the pile, on the axial center of the pile. COPYRIGHT: (C)2009,JPO&INPIT
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