Consulting engineers specialising in bridge, tunnel, marine and specialist engineering
COWI-designed Mersey Gateway Bridge opened to traffic this morning.
COWI led the Mersey Gateway Design Joint Venture – alongside AECOM, Fhecor and Eptisa, with architectural support by Dissing+Weitling - which was engaged by the Merseylink Civil Contractors to deliver the design of the £1.86bn scheme. COWI designed the bridge while AECOM led the design of the landside works including 7km of new roads.
COWI Project Director Paul Sanders commented: "It was fantastic to see the bridge open to the public this morning, marking the culmination of three and a half years of hard work. We developed the bridge's design around rapid construction cycles and long term durability and I'm extremely proud of the role our engineers played in delivering the project on schedule."
You can watch the stunning footage of the opening here.
About the bridge
The cable-stayed bridge is 1km long and made predominantly of concrete and reinforced steel. The south pylon is the tallest at 125m, followed by the north (110m) and central (80m) pylons. The deck is roughly 25m above the river bed and around 2.2km long, including the approach viaducts.
The main bridge deck is constructed from pre-stressed and reinforced concrete suspended from the pylons via high strength steel cable stays. There are 146 cables in total, spread to reflect the heights of the pylons: 62 on the south, 54 on the north and 30 on the central pylon.
The bridge has a weight bearing capacity of 53,500 tonnes and 20 million vehicles are expected to cross it every year.
Designed for construction
Structural and geotechnical engineers from COWI worked closely with the Merseylink Civil Contractors, Merseylink Ltd (the DBFO consortium) and Halton Borough Council to develop a bridge design that could be built quickly and operated and maintained as cost effectively as possible.
The decks of the approach viaducts were constructed using two 1700 tonne, 157m long self-propelled launching gantries (movable scaffolding systems) enabling rapid and safe construction of a complete 70m long span in a single pour.
On the cable-stayed bridge, six smaller gantries (form travellers) were used to cast the deck in 6m long segments in a typical cycle of just five days.
The design for the bridge was selected from a wide range of options to maximise benefits for users and the local community while minimising the environmental impact on the estuary and its surrounding environment.
The Mersey Gateway Project is one of the largest infrastructure initiatives in the UK over the coming years. The Mersey Gateway Project was identified as one of the UK government's Top 40 priority projects in the National Infrastructure Plan and it has been recognised by KPMG as one of the 'Top 100 infrastructure projects around the globe'.
Its features include:
You can find out more at www.merseygateway.co.uk
The Merseylink Consortium was appointed by Halton Borough Council as the project company in 2014, on a 30-year contract to design, build, finance and operate the project.
Its equity partners are Macquarie Capital Group Limited, BBGI, and FCC Construcción. The construction joint venture is made up of Kier Infrastructure and Overseas Limited, Samsung C&T Corporation and FCC Construcción S.A.
Emovis will deliver and operate the tolling solution for the consortium.
Director - COWI UK Limited
Head of UK Media & Communications
The stunning new bridge is the centrepiece of the project, but Mersey Gateway is about much more than just a bridge. The project includes or will have used:
It will have taken 1200 days (42 months) to build from start to finish.
The key background statistics: