34
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This composition, with its diamond bracing, has already
become a symbol of the success of London’s Olympic project, while the sustainability story behind the project has an interesting twist too. Subcontractor Watson Steel happened to come across some unwanted 1m-diameter steel gas pipeline – surplus stock from a Russian pipeline – in a yard in Yorkshire, and reused it in the Olympic Stadium’s main compression truss structure. “Basically, that steel didn’t have to be made,” says Johnson. “If
we hadn’t used it, it would have just rotted in a field. Things like that we just thought were the right things to do.” The build was made 75 per cent lighter in terms of steel use
than other Olympic stadiums. It also features a low-carbon con- crete, made from industrial waste and containing 40 per cent less embodied carbon than usual. The embodied energy consumed in manufacturing the stadium’s elements was significantly less than in previous Olympic stadiums, primarily due to its compact design. And something like 42 per cent (by value) of the materi- als used came from recycled sources, says Johnson. The scheme is also potentially upgradable with renewable energy generation elements – wind power for example, or solar. But the big sustain- ability story is the scheme’s reuse over time.
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