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The building has thirteen stories above ground plus a basement level.
After careful consideration of the constraints imposed by the requirement to minimise the structural floor zones to keep within planning constraints, the irregular plan form of the building and the need to optimise the construction period, it was decided to use an insitu concrete frame up to 12th floor with structural steel framing for the penthouse. Careful attention was given to rationalising the reinforcement and concrete sections in order to simplify and speed the construction process.
Piled foundations were provided using continuous flight auger with a contiguous piled retaining wall to the perimeter of the basement where boundary constraints prevented the use of a conventional concrete retaining wall.
A final complication in the design of the foundation was the presence of a 1000mm diameter surface water sewer crossing the footprint of the building and the need to position piles to avoid surcharging the sewer with loads from the new construction.
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