Hammersmith And City Line Bridge
The Hammersmith and City Line crosses over both Wood Lane and the eastbound Central Line. In order to provide access to the new LUL Central line Sidings, a new feeder line was required to run alongside the existing running line, necessitating a widening of the existing cutting. At the viaduct, this required removing a section of the brick arch viaduct, and replacing it with a new 20m span skew bridge.
Westfield Shopping Towns Ltd
The bridge was designed with 3 main half through steel girders, 2.7m deep, largely to provide a sympathetic elevation with the existing bridge over Wood Lane immediately to the west. A transverse moment connection provides the necessary U-frame action.
The west side support comprises three concrete piers in the footpath, this also providing a support for the existing bridge over Wood Lane. The abutment on the east side, within two brick arches, includes buttress walls to provide end restraint for the section of brick arch viaduct remaining. These supports required extensive piling, over half of which had to be installed with low headroom rigs.
A variety of construction options were considered, before finally deciding to construct the new deck alongside the existing viaduct and slide it into place. The piers and abutment were constructed in advance, the east crosshead being slid in with the deck. At the end of July 2005, over a 96-hour possession, the viaduct was demolished and the new bridge was successfully slid into position.
The project was featured in the March 2008 issue of the Bridge Engineering Proceedings of the Institution of Civil Engineers.