Cased CFA (VDW)

When constructing secant or contiguous walls in challenging ground, a double head VDW (front-of-wall) system allows simultaneous drilling of the casing and auger, maintaining precise alignment and verticality. This method improves accuracy of pile overlap, minimises deviation, reduces spoil, and ensures a higher quality wall in difficult soils or where obstructions are present. The system is particularly advantageous in restricted access or urban sites where accuracy and reduced disturbance are critical.