STIP: Upper Holloway – Bridges & Structures
HOCHTIEF is replacing four road-over-rail bridges in central London as part of TfL’s Structures and Tunnels Investment Portfolio (STIP). We successfully demolished and rebuilt the Holloway Road Bridge, which carries the busy A1 over the London Overground at Upper Holloway Station, phasing the works carefully to limit disruption to the London road and rail networks.
- Road-over-rail bridge deck demolition and construction
- Abutment strengthening
- Service bridge installation
- Complex utilities diversions
- Traffic management
As the bridge is located on a busy main road above rail lines, we could only complete permanent works in short time periods during public holidays. Working with the designer, we optimised the bridge design to maximise offsite prefabrication. This increased quality and safety while reducing time on site, ensuring that we could complete the main bridge works within the allocated rail possession.
We prefabricated the 4m wide, 18m long service bridge which carries the utilities previously buried in the road over the bridge. We carefully planned its delivery with Tf Land installed it overnight prior to the main bridge replacement to reduce our impact on the road network.
During a scheduled four-day rail possession over Christmas, we demolished the existing Holloway Road bridge deck and strengthened the abutments before lifting the new bridge beams into place and completing the new deck. We used an off-site storage yard to hold 21 precast trailer loads, moving them to site when required to minimise disruption.
We achieved 20,000 injury-free man hours during the works and completed the bridge on time.