Costain has been appointed to Transport for London’s Early Contractor Involvement framework, worth £200m overall, including such projects as the £60m Hammersmith Flyover strengthening.
Work on the flyover will start immediately, with the framework running for four years.
Ramboll and Parsons Brinckerhoff are engineering consultants on the scheme, with TfL highlighting the importance of contractor involvement to the success of the design process.
The full project scope will be defined during the ECI phase, but is likely to involve strengthening the flyover using post-tensioning, replacing bearings, waterproofing and resurfacing the deck, and replacing the drainage.
The flyover, on a key route through London, is used by 90,000 drivers a day.
It closed in late 2011, with a Transport for London investigating a “serious structural defect” caused by salt water ingress from grit laid during winter, which had corroded the cables, and reopened five months later.
Costain chief executive Andrew Wyllie said: “Costain is delighted to gain a place on TfL’s framework and to commence work on the Hammersmith Flyover, which is a technically challenging structure and an important part of London’s infrastructure.
“This award further enhances Costain’s reputation for innovation and engineering expertise across the whole lifecycle of an infrastructure asset, as well as our recognised commitment to providing our customers with certainty of delivery and cost within a collaborative working approach.”