Construction will start ahead of schedule to build the 'stadium bowl'. The ODA say that an Olympic Stadium with such a large demountable element and mix of temporary and permanent seating has never been attempted before.
When the Games have complete, the site will be transformed into a 25,000 capacity Athletics stadium.
The stadium is designed to be sustainable, and attract other businesses and investment for communities living in and around the Olympic Park.
The main stadium's roof will only cover the 55,000 spectators sitting in the temporary section, leaving the 25,000 permanent seats closest to the running track exposed to the elements.
The Olympic stadium team is a consortium of:
- Sir Robert McAlpine
- HOK Sport
- Buro Happold
NCE revealed in September that the permanent part of the stadium will be a bowl-like structure, half cut, half fill, with some parts lowered by 9m, and others areas raised by 5m. The ODA has revealed today that the bowl will be constructed with steel rakers and precast concrete units.
Sitting on top of these will be podiums housing temporary seats, covered by a 28m wide cable supported roof. The overall capacity will be 80,000 during the Games.
After the Games the roof will be lifted off, reconfigured and replaced to cover the 25,000 seat bowl.
"Piles and foundations for the 25,000 seat permanent element have been designed to take the roof structure," said ODA chief executive David Higgins. "There will be no need for retrofitting."
HOK Sport senior principal architect Rod Sheard said: "The design is a response to the challenge of creating the temporary and the permanent at the same time - that is the essence of the design for the stadium.
"A new era of Olympic Stadium design will be launched in 2012, demonstrating how a successful event can be blended with the long term needs of a community."
The roof will be a cablenet structure with primary and secondary cables, covered by a fabric membrance. As well as the roof, a fabric curtain will wrap around the stadium structure, acting as additional protection and shelter for spectators.
Catering facilities and merchandise – unable to be housed within the temporary structure – will be based in self contained pods outside the stadium.
Team Stadium, appointed by the ODA last year, were due to release their designs by February 2007.
Despite this, ODA chairman John Armitt revealed that construction would begin earlier than the July 2008 commencement date.
"The rapid progress we are making in clearing and cleaning the site means that we are now planning to start construction of the stadium on site next year two to three months early," said Armitt.