SLIME AUTO DISCHARGING DRILL BIT FOR UNDERGROUND EXCAVATION, SLIME DISCHARGING METOHD USING THE SAME

摘要

The present invention is capable of processing slime generated when the ground is perforated or a hole is expanded without installing a separate device during the perforating or after a work is completed and shortening work terms by including a hydraulic pressure outlet (20) to directly form the hydraulic pressure flow towards the upper part of a perforating hole to discharge the remaining slime in a drill rod (2) section to the outside for the remaining slime at a drill bit main body (4) and forming in order for a connection path (23) connected to the hydraulic pressure outlet (20) to be connected to a hydraulic pressure injecting main path (16) formed to the lower part of the drill bit main body (4).