Grouting and Ground Treatment: Proceedings of the Third International Conference, (ASCE)
Grouting of Micropiles in Scandinavia
J. Lehtonen, S. Aronsson
Use of micropiles has increased rapidly in Scandinavia. Applications of grouted micropiles cover underpinning works, construction of detached houses and soil nailing. Today, main part of Scandinavian micropiles are type of impact driven without grouting, when as grouting is common phase of installation for drilled micropiles. New codes of practice have been published recently in Sweden and Finland. A new impact for grouted impact driven micropiles has been made in the innovation of the CSG pile. Continuously shaft grouted or CSG micropiles have been grouted simultaneously during embedding of piles. Grouting has been implemented using pressure pumps as well as utilizing self pressuring feature of the driving method. Steel micropiles have been driven down with steel stress of 100 t0 400 MPa or 40 bar pressure peaks have been monitored causing very efficient penetration of grout into surrounding soil material.
|article #1119; publication #62 (GRT-2003)|