Articles & Case Studies

Stonbury Refurbishes Nottingham Suspension Bridge

Posted: Wednesday 23rd December 2009

Stonbury Limited is carrying out a major refurbishment of Wilford Suspension bridge which spans the River Trent in Nottingham.

Stonbury, which is experienced in such renovation work in environmentally sensitive situations, has been employed by North Midlands Construction, framework contractors to the bridge owner, Severn Trent Water.

An inspection and capacity assessment of the 70-metre bridge by Rogers Structural Investigations Ltd and Inertia Consulting Ltd in July 2008 revealed structural problems and safety concerns with regard to public use. This required closure of the Grade 2 listed structure until a major refurbishment could be completed. The bridge is more than 100 years old.

Stonbury is now well into the refurbishment programme, designed by bridge specialists Inertia Consulting, which includes the reinforcement of main bridge beams, replacement of defective structural supports and fixings, and stripping back and replacing protective coatings to the steelwork. The existing timber deck will also be replaced and anti-pigeon measures are being installed. The masonry towers and approach structures are being re-pointed and numerous minor works have also been undertaken.

With consideration for the environmental issues arising from working over the river, the first task was to encapsulate the whole bridge by erecting a specially-designed scaffold that was encased in heat-sealed ‘shrink wrap’. Together with a dustless blasting technique to remove existing coating materials, this prevented any debris from entering the watercourse, while at the same time minimising noise pollution produced from blasting of the steel.

Still with the environment in mind, Stonbury employed a two-part, solvent-free epoxy coating system for all the steel surfaces. This system has the advantage that the steel substrate did not have to be blast cleaned right down to white metal, saving blasting time, use of energy and natural resources.

All parties concerned are working to re-open the bridge as soon as possible. The total cost of the scheme is likely to be in excess of £1.5 million and will ensure the long-term future of the Wilford Bridge.

Stonbury can be contacted on 01482 88119,
www.stonbury.com or
Email jimfehrenbach@stonbury.co.uk




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