Contractor Costain was this week due to set out how it intends to carry out the next phase of strengthening work on London’s Hammersmith flyover.
Costain has been picked by Transport for London (TfL) to strengthen and refurbish the 11 spans of the 16 span structure not tackled by Amey during the £13M emergency repair programme ahead of the London 2012 Olympics.
Amey carried out the work in its role as TfL’s emergency works contractor.
Its rapid solution was to install 50 new post tensioning cables above and below the bridge deck on the five weakest spans of the 863m long precast reinforced concrete structure.
The cables were fed through specially installed concrete blocks anchored above and below the deck in the central reservation of the highway and inside the void underneath (NCE 3 May).
Client TfL was keen to explore other alternatives for the next phase of works and so rolled it into its new £200M structures and tunnels investment framework.
Contractors Balfour Beatty, Bam Nuttall, Costain, Hochtief and Skanska were appointed to the framework in March.
The programme includes the strengthening, refurbishment and replacement of eight bridges and tunnels in London including the next phase of upgrades for Hammersmith bridge.
Projects are divided into three packages based on location, type of work and value and early contractor involvement has been used.
First up will be work package three - strengthening the 11 remaining spans of the Hammersmith flyover as a follow up to last year’s emergency strengthening.
The remaining packages will be completed by 2016.
They include the complete reconstruction of the A1 Upper Holloway Bridge, a single span steel and cast iron bridge built in 1868, and major strengthening works to the A406 Power Road bridge - a three span reinforced concrete beam and slab bridge built around 1922.
Also requiring work is the A127 Ardleigh Green Railway Bridge, A1 Highbury Corner Bridge, the A406 Fore Street Tunnel and A316 Chiswick Bridge.