The Olympic Delivery Authority (ODA) announced this week that the cable net roof of the Olympic Stadium has been lifted into place, ensuring that the Stadium project remains on target for completion by the summer of 2011.
The cable net is formed between the outer white steel roof truss and an inner tension ring 30m above the field of play. Over 900 tonnes of scaffolding and over a kilometre of support platforms were used to assembled over 12,000m of cables and the walkways. It took four weeks and 56 hydraulic jacks to lift the 450 tonne structure into place.
The cable net roof will be covered with material next spring providing the correct conditions for athletes on the field of play and covering two-thirds of spectators.
“The successful lift of the Stadium’s cable roof is another milestone reached on the construction of this flagship venue,” said ODA Chairman John Armitt. “It has been a complex engineering and construction challenge, complicated by the wind and rain in recent weeks. We remain firmly on track and will lift the lighting towers into place early next year, taking the Stadium to its full height.
“We continue to make good progress across the project though there are still challenges ahead. The next year will be our toughest as the number of workers increases and activity on the Olympic Park reaches its peak so we cannot afford any complacency.”
Construction on the Olympic Stadium started in May 2008 and progress to date has included:
- Over 4,500 reinforced concrete columns installed as the foundations
- 28 steel sections of the roof compression truss lifted into place - each weigh 85 tonnes and are 15m high by 30m long
- 112 steel rakers fixed to act as the terracing supports to hold the 55,000 seats in the upper tiers
- 12,000 pre-cast concrete terracing units for the seating installed
- All five bridges and their abutments in place, connecting the Stadium island to the rest of the Park
- the fit-out of the 700 rooms and spaces within the Stadium, including changing rooms and toilets is progressing.
Next year, a 650 tonne crane will be assembled in the middle of the Stadium site to lift the 28m high lighting gantries on to inner ring of the cable net roof, taking them 60m above the field of play.