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

2. Agenda Introduction Production Installation Load capacity Summary
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video

3. Agenda Introduction Production Installation Load capacity Summary
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video

4.
Introduction
Driven tube
Ductile cast iron

5. Agenda Introduction Production Installation Load capacity Summary
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video

6. Agenda Introduction Production Installation Load capacity Summary
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video

7.
Production
Centrifugal casting

8. Transformation grey  ductile cast iron
Production
Heat treatment
Transformation grey  ductile cast iron

9. Agenda Introduction Production Installation Load capacity Summary
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video

10. Agenda Introduction Production Installation Load capacity Summary
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video

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

12. Installation - Endbearing piles
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
Installation - Endbearing piles
Foot for end bearing piles

14. Installation - Endbearing piles
Installation - Endbearing piles

15. Installation Friction piles
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
Installation - Friction piles

18. Agenda Introduction Production Installation Load capacity Summary
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video

19. Agenda Introduction Production Installation Load capacity Summary
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video

20. Skin friction piles can be stopped before full set
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
Load capacity - Friction piles
1st information: soil-expertise

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

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

24. Load capacity - Friction piles
Load capacity - Friction piles
Comparison

25. Load capacity - Friction piles
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
Load capacity - Friction piles
Pile test

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

28. Agenda Introduction Production Installation Load capacity Summary
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video

29. Agenda Introduction Production Installation Load capacity Summary
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video

30. Installation by excavator Suitable for restricted area
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
DSI – Ductile Iron Micropiles
International Society for Micropiles London, May 2009
Florian Stützel, DSI-TS