1. DSI – Ductile Iron Micropiles International Society for Micropiles London, May 2009 Florian Stützel, DSI-TS

2. Agenda Introduction Production Installation Load capacity Summary Video

3. Agenda Introduction Production Installation Load capacity Summary Video

4. Introduction Driven tube Ductile cast iron

5. Agenda Introduction Production Installation Load capacity Summary Video

6. Agenda Introduction Production Installation Load capacity Summary Video

7. Production Centrifugal casting

8. Production Heat treatment Transformation grey  ductile cast iron

9. Agenda Introduction Production Installation Load capacity Summary Video

10. Agenda Introduction Production Installation Load capacity Summary Video

11. Installation Pile head Soft soil Medium dense gravel Dense sand Soft soil Loose sand Rock Pile shoe Pile tube Coupler concrete Drive & grout = skin friction Dry driven = end bearing

12. Installation - Endbearing piles Usually non-grouted Driven until a certain set-criteria is fulfilled (e.g. progress < 20 mm / minute) If grouted piles are driven to that set, then the pile is basically an endbearing pile with additional load bearing capacity from skin friction

13. Installation - Endbearing piles Foot for end bearing piles

14. Installation - Endbearing piles

15. Installation Friction piles Simultaneously driven & grouted Driven into a layer of “good” soil Steady control and monitoring of driving progress required

16. Friction piles

17. Installation - Friction piles

18. Agenda Introduction Production Installation Load capacity Summary Video

19. Agenda Introduction Production Installation Load capacity Summary Video

20. Load capacity End bearing piles are driven to set e.g. progress less than 20mm / minute Skin friction piles can be stopped before full set

21. Load capacity - Friction piles 1 st information: soil-expertise

22. Load capacity - Friction piles 2 nd information: penetration test with DPH

23. Load capacity - Friction piles 3 rd information: Actual driving record

24. Load capacity - Friction piles Comparison

25. Load capacity - Friction piles Driving stopped after 6 m protrusion in a layer, where the driving time exceeded 30secs / 1m 6m x 0.63m²/m x 150 kN/m² = 570 kN

26. Load capacity - Friction piles Pile test

27. Load capacity - Friction piles Pile test load / time load / displacement - curve Vertical displacement [mm] Load [kN]

28. Agenda Introduction Production Installation Load capacity Summary Video

29. Agenda Introduction Production Installation Load capacity Summary Video

30. Summary Installation by excavator Suitable for restricted area No break down of pile head Installation into difficult ground condition No wastage of pile section Easy & fast

31. DSI – Ductile Iron Micropiles International Society for Micropiles London, May 2009 Florian Stützel, DSI-TS