Specialist engineering business Spencer Group has been awarded a contract to replace critical parts of the Humber Bridge.
The £3.9m project is to replace four solid steel “A-frames”, which connect the main span bridge deck to the towers at either end of the bridge, and carry out associated work to strengthen the landmark crossing.
The A-frames each weigh five tonnes and are below the 1,410m main span of the bridge. They have to be replaced because the A-frame bearings, which allow them to move as the bridge contracts and expands with the weather, have become worn.
The wear and tear has been exacerbated because of the dynamic forces on the structure over the 32 years since it was built, including the prevailing westerly wind blowing across the Humber estuary.
Expert analysis indicated that complete replacement of the system was necessary and would provide a much improved, lower maintenance solution for the Humber Bridge Board.
The latest contract follows Hull-based Spencer Group winning tenders to project manage an inspection of the suspension cables in 2009 and to use a gantry system to enable vital main cable dehumidification work to prevent corrosion of the cables in 2010.