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D. Adam, R. Markiewicz:
"Donau City Tower 1 - Deep Foundation, Excavation and Dewatering System for the 220 m tall high-rise building in Vienna";
Talk: 11th Slovak Conference on Geotechnical Engineering, Bratislava (invited); 2013-06-03 - 2013-06-04; in: "Proceedings of the 11th Slovak Conference on Geotechnical Engineering "Effect of water on geotechnical structures"", (2013), 10 - 25.

The Donau City Tower 1 is currently under construction and the first of two intended highrise
buildings in the so called "Donau City" in the north of Vienna. The DC Tower 1 is the
tallest building of the duo and comprises a height of 220 m above ground, 20 m of
underground floors, and a 35 m deep foundation. The execution of the deep excavation and
the deep foundation of the Donau City Tower 1 made great demands on ground engineering.
The geotechnical relevant works contained the construction of the pit supporting system for
the excavation pit and deep foundation works for the tower consisting of 171 diaphragm wall
elements with depths up to 30 m, and CFA piles for the foundation of shallow building parts.
A special challenge was the design and execution of the dewatering scheme to remove the
water in the quaternary soil and for lowering the water pressure in the tertiary soil layers.

http://publik.tuwien.ac.at/files/PubDat_218465.pdf