JPS55161118A - Pile driving method and pile - Google Patents

Abstract

PURPOSE: To form bulbs on the outside surface of a pile along the axial direction by a method wherein a pile provided on its outside peripheral surface with passages extending in the axial direction is driven into the grount, and groud is injected into the soil through the passages, in a method of driving a pile having large-diametered portions along the axial direction.

CONSTITUTION: Pipe-shaped members 3 for forming passages 2 are fixed to the outside peripheral surface of a pile main body 1 consisting of a steel pipe or the like. The member 3 is stopped up at its lower end and has holes 4 bored at adequate intervals in its axial direction. Pairs of projections 5 are fixed to the outside peripheral surface of the pile main body 1, with the hole 4 of the member 3 between each pair of projections 5. Pile driving procedure is as follows: after driving the thus constructed pile 6 down to a predetermined depth in the ground, pressurized water is injected into the members 3 from the upper end 1a, to soften the soil near the holes 4; then, grout such as mortar and cement paste is injected into the members 3, to cause the grout to penetrate into the softened soil from the holes, forming bulbs 7.

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