STIP: Ardleigh Green – Bridges & Structures
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.
- Road-over-rail bridge deck demolition and construction
- Service bridge
- Complex utilities diversions
- Traffic Management
- Phased reconstruction
We optimised our construction methodology to minimise disruption to the London road and rail networks.
To maintain traffic flows on this major route, we are replacing the bridge in two phases. We demolished and rebuilt the eastern side first while keeping the western side open to traffic. We then switched traffic to the new eastern side to enable us to demolish and replace the western side.
We adapted our bridge design to maximise offsite prefabrication, enabling us to lift in structural elements during short rail possessions and road closures. We built the 440t eastern deck offline then launched it 42m across the railway using a Self-Propelled Modular Transporter (SPMT) onto temporary props, before jacking it down into place. Our construction method increased quality and safety and ensured that we could complete the eastern bridge installation within the allocated possession, preventing delays.
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.