DSI Ductile Iron Micropiles International Society for Micropiles

Agenda l Introduction l Production l Installation l Load capacity l Summary l Video

Introduction l Driven tube l Ductile cast iron

Production l Heat treatment l Transformation grey ductile cast iron

Installation Drive & grout = skin friction Dry driven = end bearing Pile head

Installation - Endbearing piles l Usually non-grouted l Driven until a certain set-criteria is

Installation - Endbearing piles Foot for end bearing piles

Installation Friction piles l Simultaneously driven & grouted l Driven into a layer of

Load capacity l End bearing piles are driven to set e. g. progress less

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 l Driving stopped after 6 m protrusion in a

Load capacity - Friction piles Pile test

Load capacity - Friction piles Pile test Vertical displacement [mm] load / time load

Summary l Installation by excavator l Suitable for restricted area l No break down

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

Agenda l Introduction l Production l Installation l Load capacity l Summary l Video

Introduction l Driven tube l Ductile cast iron

Agenda l Introduction l Production l Installation l Load capacity l Summary l Video

Production l Centrifugal casting

Production l Heat treatment l Transformation grey ductile cast iron

Agenda l Introduction l Production l Installation l Load capacity l Summary l Video

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

Installation - Endbearing piles l Usually non-grouted l Driven until a certain set-criteria is fulfilled (e. g. progress < 20 mm / minute) l 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 l Simultaneously driven & grouted l Driven into a layer of “good” soil l Steady control and monitoring of driving progress required

Friction piles

Installation - Friction piles

Agenda l Introduction l Production l Installation l Load capacity l Summary l Video

Load capacity l End bearing piles are driven to set e. g. progress less than 20 mm / minute l 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 l Driving stopped after 6 m protrusion in a layer, where the driving time exceeded 30 secs / 1 m l 6 m x 0. 63 m²/m x 150 k. N/m² = 570 k. N

Load capacity - Friction piles Pile test

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

Agenda l Introduction l Production l Installation l Load capacity l Summary l Video

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

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