dsi – ductile iron micropiles international society for micropiles london, may 2009 florian...
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DSI – Ductile Iron Micropiles
International Society for MicropilesLondon, May 2009
Florian Stützel, DSI-TS
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video
Introduction
Driven tube
Ductile cast iron
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video
Production
Centrifugal casting
Production
Heat treatment
Transformation grey ductile cast iron
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video
Installation
Pile head
Soft soil
Medium densegravel
Densesand
Soft soil
Loosesand
RockPile shoe
Pile tube
Coupler
concrete
Drive & grout
= skin friction
Dry driven
= end bearing
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
Installation - Endbearing piles
Foot for end bearing piles
Installation - Endbearing piles
Installation Friction piles
Simultaneously driven & grouted
Driven into a layer of “good” soil
Steady control and monitoring of driving
progress required
Friction piles
Installation - Friction piles
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video
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
Load capacity - Friction piles
1st information: soil-expertise
Load capacity - Friction piles
2nd information: penetration test with DPH
Load capacity - Friction piles
3rd information: Actual driving record
Load capacity - Friction piles
Comparison
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
Load capacity - Friction piles
Pile test
Load capacity - Friction piles
Pile testload / time
load / displacement - curve
Load [kN]
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video
Agenda
Introduction
Production
Installation
Load capacity
Summary
Video
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
DSI – Ductile Iron Micropiles
International Society for MicropilesLondon, May 2009
Florian Stützel, DSI-TS