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Both drill strings are inserted into the ground with rotary percussion drills. The rotational direction of both drill strings is the same. Both strings are driven by one drive whilst the drilling waste is flushed out by a flushing medium in the annulus space between the outer and inner tube.
All system components can be freely configured according to your wishes and ground requirements. A specialised further development of the system is an overburden drilling process with integrated DTH hammer for extremely difficult ground conditions.