West End, Queensland, Australia
Calibre provided civil and structural design for Sorrento, an eight-storey residential apartment building of 30 units. The tower is supported over a two and a half level basement carpark which has been built below the local river water table. Lobby, retail and back-of-house services are located on the ground floor.
The tower structure involves conventionally reinforced typical floors and post-tensioned transfer beams over the basement carpark and driveway. The basement retention system was supported using steel braces to allow the bored piers to be supported without ground anchors. A braced secant pile wall was used for the retention system along with driven piles for the tower support.
As the site is located adjacent the Brisbane River, dewatering and careful detailing of the basement structure was required to ensure a watertight, hydrostatic basement was constructed.