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

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Presentation transcript:

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 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 dense gravel Dense sand Soft soil Loose sand Rock Pile 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 1 st information: soil-expertise

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

Load capacity - Friction piles 3 rd 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 test load / time load / displacement - curve Vertical displacement [mm] 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 Micropiles London, May 2009 Florian Stützel, DSI-TS