Research and Development of Micropiles in Finland Hannu

Research and Development of Micropiles in Finland Hannu Jokiniemi R&D Manager Rautaruukki Oyj/Corporate R&D Hannu Jokiniemi/Corporate R&D 07/06/2021 1

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Two examples of micropile related projects in PRIMA-programme • PYRAMIT - Design procedure of pile foundation systems for tower-type superstructures - Preliminary study report (in Finnish) was published in 2002 - Research is done at Helsinki and Tampere Universities of Technology • STEFIN 2010 - Advancing the use of steel in foundation engineering Research is focused on light houses with ventilated crawling space Preliminary study report (in Finnish) was published in 2000 Research is done Tampere University of Technology and National Research Centre of Finland (corrosion) Hannu Jokiniemi/Corporate R&D 07/06/2021 5

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VENTILATED MICROPILE FOUNDATIONS • Founded on micropiles • Piles cut off above the ground • • level Base floor supported directly on the piles Fully ventilated crawl space No separate footings No frost insulation No underdrains Very fast installation Installation possible in all kinds of soil Hannu Jokiniemi/Corporate R&D 07/06/2021 10

A ROW HOUSE FOUNDATION IN VIIKKI, HELSINKI • 68 steel pipe piles ø 115 mm / • • • ø 75 mm Framework from hollow section steel profiles Framework joints by bolts Framework prefabricated in workshop Framework zinc coated Foundation installation in 3… 5 days Hannu Jokiniemi/Corporate R&D 07/06/2021 11

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