A Spiral Auger and A Method for Soil Cement Pile using it

摘要

The present invention relates to a spiral drilling auger having a plurality of cutter blades which protrude from an outer circumferential surface of a rod having a vertically spiral shape to enable a gap to be formed between the adjacent cutter blades, wherein the protruding length of the cutter blade is reduced from an upper side to a lower side. The present invention prevents aggregation of the soil during a drilling and a withdrawal process to simplify the following process.