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Precast
Coffered Slab Units |
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Reduction in
the on-site program period was possible with a hybrid in-situ concrete frame
with precast coffered slab units. The coffered slab units, each weighing 11
tones, were manufactured off-site using steel moulds. The sequence of frame
construction was to erect the 400mm diameter columns first, then place the 12m
long precast coffer units on temporary supports. It was followed by the casting
of the in-situ perimeter ring beam and structural topping in one operation, to
tie the precast elements together. |
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Steel Shutters for In-situ Edge
Beams |
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The use of
purpose-made steel shutters, both for on-site for in-situ edge beams, and
off-site for the coffer units, enhanced the quality of finish and speed of
construction. |
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Roof Steel Structure for the Atrium |
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The roof
steelwork over the atrium comprises slender steel trusses at 6m centers spanning
the 12m width of the atrium. The top and bottom chords are formed from
back-to-back steel channel sections with 32mm diameter tie rods forming the
internal bracing. |
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Cost Analysis |
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The cost
analysis is based on post-tender resolution costs, which would most accurately
represent an analysis of tender under a traditional form of contract. The
overall figure of £1140/m2 (low energy design), including fit-out, is well
within the range of costs for similar buildings. |
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Cost Summary |
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