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DSI – Ductile Iron Micropiles

DSI – Ductile Iron Micropiles. International Society for Micropiles London, May 2009 Florian Stützel, DSI-TS. Agenda. Introduction Production Installation Load capacity Summary Video. Agenda. Introduction Production Installation Load capacity Summary Video. Introduction.

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DSI – Ductile Iron Micropiles

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  1. DSI – Ductile Iron Micropiles International Society for MicropilesLondon, 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. Pile head Soft soil Pile tube Soft soil Coupler Medium dense gravel Loose sand concrete Dense sand Pile shoe Rock Installation 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 sete.g. progress less than 20mm / minute • Skin friction piles can be stopped before full set

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

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

  23. Load capacity - Friction piles 3rd 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 Verticaldisplacement [mm] load / displacement - curve 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 MicropilesLondon, May 2009 Florian Stützel, DSI-TS

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