- Drill casing and auger are drilled into the ground simultaneously by two rotary drives rotating in opposite directions.
- The soil which is loosened at the auger tip is conveyed to the surface by the auger flight inside of the casing and discharged through a gate underneath the rotary drive
- Concrete is placed through hollow stem auger as drill casing and auger are simultaneously withdrawn.
- A special design of the rotary drives allows the construction of piled walls directly in front of existing walls of adjacent buildings (=> FoW system). The usable excavation pit area is maximised.
- Diameters 305 - 508 mm
- Drilling depth 10 - 18 m