| 摘要 |
PROBLEM TO BE SOLVED: To make construction easy, since the number of columnar pile is reduced, when bearing power of the columnar pile can be further increased, though a ground reinforcement technique for establishing the columnar pile by a non-earth removal system is conventionally known.SOLUTION: A ground improvement casing comprises a cylindrical casing body 3 and an overhang part 63 arranged on the base end side of the casing body and forming an external shape of overhanging to the outside in the radial direction of the casing body, and the overhang part is constituted of the same diameter enlarged diameter part 65 for enlarging a diameter in the same diameter shape and an inclined diameter reduction part 67 linked on the base end side to the same diameter enlarged diameter part and reducing a diameter in an inclined shape toward the hole drilling direction. The periphery of the established columnar pile becomes a consolidation wall, and peripheral surface frictional force is secured. A part having the overhang part 63 becomes a diameter-enlarged pile head, and since its undersurface side is inclined, the consolidation wall is also formed on its periphery, and the peripheral surface frictional force is secured. Thus, ground bearing power is secured by the presence of a pile head.SELECTED DRAWING: Figure 12 |
