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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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