Tangentoppen AS

Execution
6 meter lengths are drilled with steel core piles of the same size
168.3x4.5mm, 193.7x5mm and 273x6.0mm. It is set respectively
steel cores ø120, ø150mm and ø180mm in these casings.
RD poles of 6 meter lengths with threads and sleeves for splicing are off
the dimensions RD170/10, RD220/10 and RD220/12.5mm.

The drilling system used here is the Robit Prime Drill thrue, as it has
been under-drilled for rock footing on the steel cores. The advantage of this
the system is that you can easily disengage from the ring shoe to drill
further down into the mountains without having to change to the mountain crown.