PENETRATION METHOD FOR ROTARY PILE

PROBLEM TO BE SOLVED: To provide penetration method for a rotary pile having easily trans portable weight without requiring no new equipment for a rotary pile intruding device body, surely supporting rotational reaction and surely intruding the rotary pile even if a rotational reaction is large. SOLUTION: This intruding construction method of the rotary pile uses a rotary pile intruding device for pulling out a steel pipe pile by pushing the steel pipe pile in the ground by rotating and vertically moving the steel pipe after clamping the steel pipe pile. The construction method comprises. The first process of previously using the rotary pile intruding device to push a reaction taking pile 20 in the ground; the second process of moving the rotary pile intruding device to a pushing-in position of a prescribed steel pipe pile 10, and then continuously connecting the rotary pile intruding device to the reaction taking pile 20 via a reaction taking member 13; the third process of pushing the steel pipe pile 10 in a prescribed position; the fourth process of successively repeating the second process to the third process and pushing plural steel pipe piles 10 in the periphery of the reaction taking pile 20 pushed in the first process.