The main part of the works was the construction of a Portal from the transition zone from Drill and
Blast to the Cut and Cover tunneling into Oslo S.The first step was the installation of a temporary casing and cleaning of the hole in order to penetrate in the faults of the
weakness zone. Afterwards grouting from bottom to the top in 5 meter stages with packers was executed.
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Blast to the Cut and Cover tunneling into Oslo S.The first step was the installation of a temporary casing and cleaning of the hole in order to penetrate in the faults of the
weakness zone. Afterwards grouting from bottom to the top in 5 meter stages with packers was executed.