STIP: Ardleigh Green – Highways
HOCHTIEF is delivering the demolition and replacement of four road-over-rail bridges in central London as part of TfL’s Structures and Tunnels Investment Portfolio (STIP). We are currently replacing Ardleigh Green Bridge, which carries the four lanes of the A127 Southend arterial road over the East Anglia Railway, carefully phasing the works to limit disruption to the London road and rail networks.
- Road-over-rail bridge deck demolition and construction
- Service bridge
- Complex utilities diversions
- Traffic Management
- Phased reconstruction
To reduce lane closures and minimise congestion on this major route in and out of London, we optimised our construction sequence to complete the replacement in two phases.
During phase one, we demolished the eastern side of the bridge during a three-day closure of the A127. We set up a contra-flow arrangement on the remaining half of the bridge to keep the road open to traffic while we rebuilt the eastern side.
We prefabricated the eastern bridge deck offline and launched it across the railway during another short road closure, reducing construction time on site and our impact on the road network. Once the eastern section was complete, we moved the contraflow onto it to enable us to start phase two: the demolition and replacement of the western side.
Our phased approach has enabled us to keep the A127 open to traffic in both directions throughout construction, only closing it temporarily for the key demolition and bridge launch works.
Prior to the main bridge works, we relocated all utilities previously buried in the carriageway to an adjacent services bridge, reducing the need for lane closures during future maintenance of utilities. We are currently working on phase two of the works, which involves the demolition and replacement of the western side of the bridge. We won a Considerate Constructors Performance Beyond Compliance award and are due to complete the works by spring 2019.