Bidders for the £600M Mersey Gateway crossing in north west England are considering radically changing its cable-stayed bridge design in favour of a cheaper alternative, NCE understands.
The three shortlisted bidders were this week locked in competitive dialogue talks with the project client and are now thought to be reconsidering earlier ruled out options, including a box girder or arch bridge, to save money.
The specimen design favours a 1km long cable-stayed crossing of the Mersey Estuary with three lanes in each direction along with 8.5km of associated new and upgraded link roads.
The possibility of changing the bridge design has been prompted by client Halton Borough Council’s plans to abandon plans for a two level deck which would have accommodated a light rail line.
Removing this feature means a more slender deck design will be needed with accompanying measures to improve stiffness under traffic loadings.