EXCAVATING BIT HAVING WINGS WHICH IS ROTATABLE BY COMPRESSED AIR

摘要

The present invention relates to an excavating bit having reaming wings which are rotated by compressed air, and more specifically, to an excavating bit for forming a partial reaming hole on an inner wall of a base pile laying hole by reaming when the ground is excavated to form a laying hole during preboring construction of a base pile. The excavating bit with reaming wings comprises reaming wings which are unfolded toward the outside of a main bit body by centrifugal force and air pressure while the main bit body is rotated by using compressed air supplied from the ground to enable the reaming wings to gradually crash the laying hole by rotation of the main bit body in order to form an expanded hole while the degree of unfolding the reaming wings gets higher, thereby easily performing preboring construction about a base pile and shortening construction time.