Hammer-drilling arrangement for drilling purposes comprises a hammer-drill head, a flushing medium supply unit, a drill pipe with a conveying channel for the drillings and an overlaying pipe connected to a drilling crown

摘要

Hammer-drilling arrangement comprises a hammer-drill head (6) with an impact drilling crown (9), a flushing medium supply unit, a drill pipe (2) with a conveying channel (3) for the drillings and a feed channel (4) for the flushing medium and an overlaying pipe (12) connected to the drilling crown. Preferred Features: The arrangement also has a seal for sealing the borehole from the borehole opening. The seal is arranged in a fixed distance from the drill head. The seal has an assembly ring which is fixed in a rotary manner to the drill pipe.