PILE CONSTRUCTION METHOD

PROBLEM TO BE SOLVED: To prevent the retaining of a pile at a high level effectively by inserting the pile under the condition that the gravels inside an expanded drilled holes are floated. SOLUTION: An expanded drilled hole 11 is formed in an drilled hole 10 and at its top end, a foundation consolidation liquid 8 is filled into the holes 11, and then a pile 20 is driven in. Also, when the holes 11 are excavated, a drilling liquid 6 with a viscosity sufficient for gravels 7 or sand gravels present inside the holes 11 not to be naturally sunk but to be floated is used. By this, the pile can be prevented from being retained at a high level, and thus post- treatment such as the chipping of pile head is not required. In addition, when a pile with bag is used for piles, also the retaining of the pile at a high level can be prevented, and the expansion of the bag by gravels is not obstructed, and thus an expanded bulb of a prescribed form can be formed securely.