Bridge repair

01 May 2008

The use of salty water in the concrete mix has led to extensive and complex concrete repairs to Sweden's 6,3 km long combined Svinö and Öland Bridges. These are expected to reach nearly twice the cost of the original structure when restoration is finally completed. Crumbling piers have been covered with reinforced concrete shells and the affected foundations strengthened. Repairs are now focusing on the deck, including replacing some of the parapets, joints and bearings by contractor NCC for client Swedish National Road Administration (Vägverket).

A Conjet 363 MPA high pressure hydrodemolition robot is playing a key role assisting in repairs to the bridge deck. Contractor Waterjet Entreprenad AB, working as the specialist hydrodemolition contractor to NCC, is using the machine to selectively remove concrete from the edge of the deck and clean and expose reinforcement for NCC to cast on new sections of parapet.

“This is probably the world's most extensive concrete bridge repair project and hydrodemolition, with certified equipment, has been the only approved and specified method of removing concrete from bridge decks and other sensitive structures in Sweden for the past 20 years,” said Vägverket bridge repair project manager Jan-Olof Bolin.

He continued, “This technique of using very high pressure jets of water to remove the concrete does not cause any damaged to the healthy concrete left behind. It also removes concrete from above or below any reinforcement, which is also cleaned of any rust. Hydrodemolition also produces a very rough and uneven surface, which provides a strong bond at the interface for the new concrete to key onto.”

Latest News
Barnhart opens second Ohio location
The addition of the Columbus branch enhances Barnhart’s presence in the Midwest. 
Portugal unveils high-speed rail plans
Construction on the rail project’s €3bn first phase will start in 2024