View photos of the construction in our Aquatics Centre gallery
The 'big lift' of the structure began in March 2009. The 160m-long and up to 90m wide roof rests on two concrete supports at the northern end and a 28m long and a 5m wide, supporting вЂwallвЂ™ at its southern end.
A huge 30m steel truss weighing over 70t was lifted into place on top of the southern wall and connected to 10 steel trusses each made up of four sections which in total will span up to 120m to the two northern roof supports.
The steel trusses were fabricated in Newport from plate rolled in Gateshead, Motherwell and Scunthorpe, assembled on the Aquatics Centre site and connected together 20m off the ground on three rows of temporary support trestles.ADVERTISEMENT
Once the steel frame was complete it was lifted over a metre at its southern end, turning on rotating joints in the northern roof supports. The top of the temporary trestles was removed and the 160m long roof frame lowered on to its three permanent roof supports.
As the full weight of the roof rested on its supports, it slid approximately 20cm into its joints on the southern wall. The roof has been designed to stretch, twist and contract in response to the effects of snow, wind and changing temperatures.
Temporary trestles, which have now all been removed, were taken out in phases to enable work to continue beneath the roof, including the digging out and concreting of the venueвЂ™s two 50m swimming pools and 25m diving pool.
Work will begin this autumn on the aluminium roof covering, half of which is recycled, and early next year installation will start on the timber cladding of the 12,000m2 ceiling which will sweep outside to cover the northern roof supports. Red Lauro from sustainable sources has been selected as the ceiling timber.
Work is well underway on the 250m and 45m wide land bridge that forms the main pedestrian entrance to the Games from the Stratford City development, spanning the Aquatics Centre and forming the roof of the training pool.
The Aquatics Centre is scheduled to finish in summer 2011 ready for test events.
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