The works comprise reconstruction of a highway bridge over the railway near Didcot, Oxfordshire. The bridge, which takes the northbound roadway from the A34 Milton Interchange over the Great Western main line carries over a 1000 vehicles an hour at peak times. The bridge was assessed under the bridgeguard scheme as having a safe capacity of 7.5T and was recorded as having a sub-standard structure gauge to the railway.
Strengthening the bridge deck was not a viable solution and whole life costings together with the need to raise the soffit height for future electrification pointed to replacement.
Crouch Waterfall designed the new bridge superstructure to carry 40/44T vehicles with increased carriageway width and structure gauge under. Crouch Waterfall integrated the temporary works into the permanent works design including ground anchors to stabilise the abutments, crane foundations, lifting plans, lifting cradles, carriageway vertical and horizontal alignments, ground investigation works and embankment modelling works.
Works started Autumn 2010 and were completed summer 2011.