Crushed stone pile construction method, crushed stone pile construction jig, and crushed stone pile construction system

摘要

PROBLEM TO BE SOLVED: To provide a construction method of a crushed stone pile for preventing the inflow of sediment to the inside of a casing pipe, and capable of surely opening the tip of the casing pipe.SOLUTION: A construction method of a crushed stone pile comprises a first process of penetrating a casing pipe 2 for providing a diametrical expansion part 5 on the tip into the ground in a state of separably storing a cover member 10 in the diametrical expansion part 5, a second process of pulling back the casing pipe 2 from underground and separating the cover member 10 from the diametrical expansion part 5, a third process of inputting a crushed stone G into the casing pipe 2 from aboveground and a fourth process of push-hardening the crushed stone G in the ground by repeating intrusion and pull-back of the casing pipe 2.SELECTED DRAWING: Figure 2