IWM 2004 Jouko Lehtonen

Introduction to Micropile Activities in Nordic Countries

Jouko Lehtonen

IWM 2004 Jouko Lehtonen

Micropile activities in Nordic Countries•Several research projects

•DATU, Turku Polytechnic•Pyramit, HUT&TUT•TUT laboratory tests

•Growth of business significant in Sweden, Norway and Finland

•Sustainable growth in traditional appications•Rapid growth in new applications

•New applications

•New steel grade

IWM 2004 Jouko Lehtonen

IWM 2004 Jouko Lehtonen

New applications of micropiles:

•steel foundations of detached houses

•steel foundations of wind power stations towers

•very shallow pilings

Very shallow pilings:

•complementing impact driven piles < 4 m

•complementing shallow foundation; no excavation

IWM 2004 Jouko Lehtonen

IWM 2004 Jouko Lehtonen

New steel grade

•RD piles

•S550

•D140…220•s8…12,5

IWM 2004 Jouko Lehtonen

Micropiles in the windmill towers

•Substitutive structure when gravity foundations normally in use

•Savings in excavations and volumes of concrete

•Micropiles as•Passive anchors / tension piles•Compression piles

•Case: Raahe wind farm

•RD220-12,5 S550