Optional Special Techniques
1. Expendable driving rings and / or bentonite lubricating skin to aid penetration and extraction in cohesive soils.
2. Jetting, pre-drilling and / or coring through the tube to improve penetration and /or to reduce vibration.
3. ‘Conditioning’ of very soft ground before forming shaft.
4. ‘Sliding ring’ to increase shaft diameter in softer upper layers.
5. Additional depth with extension tubes of up to 6m.
6. Top driving of tube with expendable end plate.