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Retail walkways and a full height glazed elevation. Car park demonstrates concrete constraints Realisation of the developer’s catering aspirations, after erection of the elevation steelwork, brought a Dundrum’s five storey car park structure contains 4,100t of structural steelwork with 54,000m2 of request for extensions of two upper floors beyond pre cast concrete plate flooring, mostly 100mm thick with a further 100mm ‘topping’. “This car park the glazing line. had to be a step above all others,” says Dundrum Project Manager Pat Lafferty. And so it has been “TJ O’Connor carried out a major reassessment built. Ventilation shafts at each double-column support keep the air clean and the internal structure of the structure and designed a system of is painted white and well lit with floors colour painted to mark out parking spaces and walkways. strengthening the external terrace transfer structure However, according to FEL Managing Director Ernie Fisher, construction of the car park – Area so it could support two further floors,” Fisher says. K/L – was far slower and more problematic than other phases. “Permanent formwork needed “The engineer’s solution involved welding new UC temporary propping for pouring concrete on 7.8m slab spans. This was an ever present health and sections to the underside of the existing 914mm safety issue and had a marked effect on the construction sequence in comparison to areas where deep beams.” FEL first had to design a temporary metal decking was used to support suspended floor slabs.” propping system and jack up the floor loading the transfer beams. Welding and reloading of the transfer structure then allowed completion of the two floor extensions. “This and many other changes requested would have been impossible in the time available using reinforced concrete. Tenants nearly always want changes. The beauty of steel is that it is unquestionably more flexible,” says Philip Howard. “Nothing was too big a problem and every one of the partners took a share of the workload,” adds Pat Lafferty. “There would not have been such a high quality of space if everyone had not been so willing to make it work. The relationship was quite unique.” Profile & Drill Shotblasting website: www.kaltenbach.co.uk/news NSC February 2006 15


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