Classic bored pile system which transfers torque and vertical crowd force to drilling tools via a telescopic kelly bar.
- Borehole wall is supported either by excess hydrostatic pressure or by drill casings.
- Installation of drill casings by rotary drive or by casing oscillators attached to rig.
- By using different drilling tools the system can be employed in all types of soil (including bedrock).
- Diameters 600 - 3000 mm
- Drilling depth 15 - 90 m