Connect Plus completes joint replacement scheme on QEII Bridge

30/10/2014
Highways Reporters

Connect Plus, the company responsible for managing and upgrading the M25 network, has this month completed the installation of new bridge expansion joints on the Queen Elizabeth II Bridge at Dartford.

The project, which was recently recognised as the ‘Most Innovative Highway Authority Scheme of the Year’ at the Highways Magazine Excellence Awards, involved replacing six bridge expansion joints, weighing 80 tonnes each. All had reached the end of their lifecycle having expanded and contracted by over three metres in the heat and cold during the bridge’s 23 year operation.

With over 150,000 vehicles using the bridge daily, traffic flow continuity was critical during the project and Connect Plus, working with its designer Flint &Neill and contractor Jackson Civils, developed a brand new temporary over-ramp system. This allowed the workforce to repair the expansion joints underneath, while traffic passed overhead. Carriageway closures were dramatically reduced compared to typical bridge joint replacement schemes with restriction to times when the temporary ramp system was installed.

The modular ramp system comprised of 1.2 metre wide units which could be dropped into place, further reducing carriageway closure time. Their built in finger joints allowed the bridge road surface to expand and contract normally and the design of the ramp allowed for vehicles to travel safely at speeds of up to 70mph, well in excess of the limit on the bridge and negating the need for vehicles to slow down. Each ramp was installed and removed four times and each required the removal and replacement of 458 bolts with around 100m3 of concrete removed during the repair process.

During the time the ramps have been in place approximately 30.2 million vehicles have driven over the system.

Brian Johns, Connect Plus Services managing director, said: “We are pleased to have been able to finish this important project and that its innovative approach has been recognised as the leading scheme in our industry. The use of the temporary over ramps on the QEII Bridge has allowed traffic to pass over the bridge with far less interruption than would have been the case with traditional roadworks and has improved safety for both road users and road workers for the duration of the works. So successful has the temporary ramp system been that we now plan to use the same system to replace movement joints at other locations on the M25 network during the duration of the 30 year Design Build Finance and Operate contract.”
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