Auger and method of installing piles in a ground by means of said auger

摘要

Drill screw comprises a blocking unit for blocking the turning passage (6) provided on a drill pipe (2). Independent claims are also included for the following: (1) Process for forming a foundation column in the ground; and (2) Drilling machine for carrying out the process. Preferred Features: The blocking unit is arranged in a lower region of the helix (4). The blocking unit has a closure element (40) which can be adjusted on the drill pipe into a blocking position in the turning passage.