DEVICE FOR DRILLING OR DRAINING HOLES IN SOIL OR ROCK

摘要

The invention relates to a device (1) for the drilling, notably by percussio n or rotary-percussion drilling, and draining of holes in soil or rock. A dril l bit (2, 3) mounted on a drill rod (4) creates a bore hole and a jacket tube (6) is coupled to the drill rod (4) or the drill bit (2, 3). In the area adjacent to the drill bit (2, 3) the jacket tube (6) has at least one throug h hole which opens into an annular space embodied between the drill rod and th e jacket tube. In the end area adjacent to the drill bit (2, 3) the jacket tub e (6) is surrounded by at least one filter tube (7) having a plurality of through holes or slits (8) which are distributed especially evenly across it s circumference. This allows for correspondingly safe and reliable drainage during boring, using simple measures.