A new link into the Olympic Park beneath the A12 dual carriageway has been completed on schedule.
The new underpass has been constructed in the north east corner of the Olympic Park to form part of the Olympic Loop Road – a new route that will provide access around the site − and was constructed beneath the A12 6 lane dual carriageway while it remained operational to daily traffic.
50 workers were involved in the project working 24 hours a day. The project was completed in 28 days.
“The delivery of this critical engineering project on time is a significant achievement given the complexities and challenges involved.”
John Armitt, ODA
The underpass was positioned using the box jack method which involved a pre-constructed concrete box ‘pushed’ through the ground beneath the A12. Tunnelling techniques were used to excavate the ground ahead of the box while hydraulic rams then pushed the box into the excavated tunnel face.
The concrete box forming the underpass was constructed in three sections and measures 50 metres long, 11.5m wide and 8m high in total and weighs 3500 tonnes.
ODA chairman John Armitt said: “The delivery of this critical engineering project on time is a significant achievement given the complexities and challenges involved. The completion of this underpass creates another essential new link into the Olympic Park.”
The underpass works are part of the wider structures, bridges and highways project – the single biggest construction project the ODA is delivering to create new connections across the Olympic Park.
Construction work is now underway on 21 of 30 new bridges and underpasses that will cross waterways, roads and rivers to create a connected, open and accessible Olympic Park for the Games and legacy.