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A method of drilling through the overburden with the aid of an outer casing to support the borehole wall is the so-called duplex drilling process. The system depicted here is drilled simultaneously with outer casings and inner rods and driven by a rotary head unit.

A method of drilling through the overburden with the aid of an outer casing to support the borehole wall is the so-called duplex drilling process. The system depicted here is drilled simultaneously with outer casings and inner rods and driven by a hydraulic drifter. The drill string thus experiences both rotation and percussion.

Depending on the intended purpose of the borehole, for instance, to support a bored diaphragm wall, or a subterraneous curtain wall, a cased drilling system is necessary to realise such a borehole.