STIP: Upper Holloway – Highways
HOCHTIEF is replacing four road-over-rail bridges in central London aspart 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
- Complex utilities diversions
- Traffic management
Prior to the main bridge replacement, we built a new service bridge to carry the utilities which were previously buried in the carriageway of the bridge. We carefully planned the delivery and installation of the bridge to reduce congestion and installed it overnight to minimise our impact on the road network.
With the main bridge demolition and replacement works requiring a full closure of the A1 over Christmas 2016, we worked closely with TfL to plan the Traffic Management (TM) layout, storage areas and diversions surrounding the worksite to minimise disruption. Our detailed phasing and logistics plans kept the public safe and clear of demolition works, while maintaining diversions for buses, cars, pedestrians and cyclists. To reinstate traffic flows as soon as possible, we reopened the lanes running over the bridge in stages, opening two lanes after 20 days, another two weeks later and the fourth lane the following month.
We maximised offsite prefabrication to minimise construction time and we provided a mini bus to bring operatives to and from site, reducing our impact on the road network.
We achieved 20,000 injury-free man hours during the works and completed the bridge on time.