| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground anchoring method which increases a pull-out force so as to resist an excessive horizontal force mostly acting in the vicinity of a pile head at the time of occurrence of an earthquake, etc., improves horizontal strength of a pile, and obtains pull-out resistance being almost double the resistance of a conventional cylindrical pile. SOLUTION: A pile hole 22 having a shaft portion 23 and an enlarged bottom portion 24 is excavated. Then, the existing pile 1 having a lower end 15 of an anchor material 14 fixed to a lower edge plate 5 is embedded and anchored into the pile hole 22, and an upper end 16 of the anchor member 14 having passed through hollow portions 4 and 7 of the existing pile 1 is protruded from an upper edge of the existing pile 1, to thereby construct a foundation pile 30. A lower pile 2 of the existing pile 1 has an annular rib 3, which is anchored into a foot protective layer 26 of the enlarged bottom portion 24. Then, a hooting 32 is constructed at an upper end of the foundation pile structure 30, and the upper end 16 of the tensed anchor member 14 is fixed to the footing 32 (a). When a pull-out force is generated, of inverted-conical bearing force 37 acting from an upper surface 3b of the annular rib 3 in a diagonal upward direction in the foot protective layer 26, and a frictional force on the periphery of the existing pile 1 function to resist the pull-out force (b).
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