1. Introduction to Micropile Activities in Nordic Countries
Jouko Lehtonen
Introduction to Micropile Activities in Nordic Countries
IWM Jouko Lehtonen

2. 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 Jouko Lehtonen

3. IWM Jouko Lehtonen

4. 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 Jouko Lehtonen

5. IWM Jouko Lehtonen

6. New steel grade
RD piles
S550
D140…220
s8…12,5
IWM Jouko Lehtonen

7. 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 Jouko Lehtonen