Top-down construction within diaphragm
wall was used at Sai Ying Pun due to the
limitations of space. The top roof
slab was constructed between the two walls
and central steel piles were driven to
support it until the dividing wall could
be constructed. The base slab was then
placed, supported by shear keys into the
diaphragm walls. |
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One of the major concerns was the control
of water seepage through the diaphragm
walls and the roof and base slabs. Precast
wall panels were erected along the diaphragm
walls leaving a 400 mm gap. Half round
drainage channels have been provided at
the top of the profile road barrier between
the wall and the panel and these were
drained at intervals into the road drainage
system. |