Olympic Delivery Authority Chairman John Armitt said: ‘The delivery of this critical engineering project on time is a significant achievement given the complexities and challenges involved. It is a testament to the hard work and ingenuity of our workers and engineers working round the clock to construct the new underpass beneath a busy dual carriageway, without causing any disruption to motorists.'
The new underpass was created by pushing a pre-built concrete box through the ground into position. The ground ahead of the box was excavated while a series of hydraulic rams pushed the box into the tunnel face. The concrete box was constructed in three sections and weighs 3,500 tonnes.
