Civil Engineering Reference
In-Depth Information
The work package for the basement and staircase cores was undertaken by P C
Harrington, a specialist package contractor. The three cores in each of the towers
was constructed using the slipform formwork system. Concrete pumping was main-
tained to the 12
th
floor level, the final three floors being placed by tower crane
and skips.
Image of staircase cores
Cores 1, 2 and 3 consist of three staircase towers linked by flank walls and
beams. The average construction period per core is approximately 6 to 7 weeks.
The concrete cores assist in providing stability ties to the steel frame at each
floor level.
Multi-story steel frame
A sequence study is later illustrated for the erection of the sixteen storey frame.
Floors 1 and 2 above the basement level consisted of a series of precast perimeter
columns supporting the second floor steelwork.
Steelwork to floors 3, 4 and 5 was then erected incorporating the precast coffered
floor units. Subsequently floors 6, 7 and 8 followed. Above floor 8, the building frame
is stepped back to incorporate the vierendeel steel frames. These form a feature on
the front elevation of the building.
