DFI Magazine November/December 2020 - 20

Steel core micropiles within the developing top down tunnel

any disturbance of surrounding soil. Based
on piezometer readings obtained on the
site and within 0.6 miles (1 km) of the
project, using water as a drilling fluid
significantly reduced water pressure
changes. The approach also was found to
reduce fluid volumes 40 times compared
to air drilling. Therefore, soil inside the
casing was always flushed with water to
protect the casing and to avoid any soil
disturbance. This minimized the risk of quick clay landslides and
settlements due to pore pressure changes and ensured safe
construction of foundation works.
To reduce the project's overall environmental impact, the
majority of the equipment - including the water pumps, backflow
treatment plant and grout mixing plant - was powered by
electricity. The backflow treatment plant also reduced Keller's need

for material transport to a landfill.
However, because electric versions of other
machines are still being developed, Keller
executed the micropile drilling at Oslo S
using a Klemm 807 drilling rig, with a fossil
fuel-based engine.
Based on the KRCD method being
successfully applied at the Follo Line
Project, Keller is investigating automatization of stages in the flow chart for
each single pile, in combination with automating the drilling
parameters used for project execution.

The KRCD method applied with
double rotary heads allowed

the most sensitive drilling in

difficult soil conditions for the
Oslo S project.

20 * DEEP FOUNDATIONS * NOV/DEC 2020

Dominik Gächter, Dipl. Ing., is the regional manager for Keller in Norway. In the
last 10 years, he has built up international experience in geotechnical
engineering and contracting, and leads some of the largest European
infrastructure projects for Keller.



DFI Magazine November/December 2020

Table of Contents for the Digital Edition of DFI Magazine November/December 2020

TOC #1
TOC #2
DFI Magazine November/December 2020 - Intro
DFI Magazine November/December 2020 - 1
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DFI Magazine November/December 2020 - TOC #1
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