storey Central tower. A total of about 6,100 tonnes of reinforcement was used in the construction of the three towers, podium and basement structure which is founded on approximately 1,200 piles. The pile sizes and types vary from 520mm diameter driven piles to 1,500mm diameter auger piles.
The project offered several structural design challenges, which ranged from designing a basement for a 1:100 year flood level to transferred lateral stability elements and unique geometries located on the suspended slab of the podium level.
The 14,000m 2 basement raft and perimeter walls were designed as a water-excluding structure. With the development located between
the Black River and Liesbeek River, the foundation raft and perimeter walls, shown in the figure below,
had to be designed for a 1:100 year floor level. The design flood level is 2.3m above the raft’ s top of
92 Amazon