Introduction to Micropile Activities in Nordic Countries

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Presentation transcript:

Introduction to Micropile Activities in Nordic Countries Jouko Lehtonen Introduction to Micropile Activities in Nordic Countries 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 IWM 2004 Jouko Lehtonen