Hollow auger for casting piles in situ, and drilling device including at least two such augers

摘要

The auger comprises a hollow support tube (4) comprising an external blade (10), an injection tube (15) extending inside the hollow support tube (4) with which it delimits an annular volume (16), and a sealing piston (18) placed in the annular volume (16) and firmly attached to the lower end of the injection tube (15). In addition, holding means (20) are fitted in order to lock the injection tube (15) in rotation and enable this tube and the support tube (4) to move simultaneously in translation, and centring means (19) placed in the annular volume (16) and firmly attached to the injection tube (15) enable the support tube (4) to rotate about this tube (15). IMAGE