METHOD AND APPARATUS FOR DRILLING ROAD OF ROTATE DISCHARGE

摘要

PURPOSE: A method and a device for discharging a drill rod for soft ground improvement are provided to facilitate the rotation and extraction of a drill rod by the expansion of the drill hole. CONSTITUTION: A method for discharging a drill rod for soft ground improvement comprises the following steps. The direction of a nozzle(31) installed in a connection rod(30) horizontally faces the rear end of the rotational direction of the boring rod. The connection rod connects a drill rod to a front device drilling the ground. A drill hole is expanded by the pressure of water sprayed from a nozzle when a drill rod is extracted, so the drill rod does not receive resistance by soil, is smoothly rotated, and is extracted out.