Seismic Upgrading - Retrofitting of Foundations

In order to meet modern requirements on earthquake safety, this 70 year old building needed to be retrofitted. The designer chose high capacity Ø 57 mm DCP GEWI^® Piles. Restricted by the low ceiling height in the building, the 15 m deep,  Ø 140 mm boreholes were drilled with a track-mounted hydraulic mini-drilling rig. The anchors were coupled in sections from 2.7 m to 4 m. The tight restrictions of 2.7 m headroom, 0.60 m spacing at the pile head and pile inclinations of up to 40° posed no problem for this very flexible installation method.