PURPOSE:To surely form consolidation of foundation with high compressive strength and less variations by forming consolidation of foundation and hardening after impregnating the mortar with a specific viscosity into a pile hole. CONSTITUTION:A pile hole 1 is excavated, and a large diameter section 2 having larger diameter than that of the pile hole 1 is formed to the bottom of the pile hole 1 at a specific depth. Then, after impregnating the mortar having the viscosity adjusted from 60 to 90 sec into the large diameter section 2, a precast concrete pile 3 is sunk and set into the pile hole 1 as its lower end opens, and the lower end of the pile 3 is inserted into the mortar. When the mortar impregnated this manner is hardened, lay out work 4 of the foundation pile in the of foundation work is accomplished.
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