Consulting engineers specialising in bridge, tunnel, marine and specialist engineering
The deck of the Mersey Gateway Bridge, a new COWI-designed road bridge over the River Mersey, was successfully closed on 31 July 2017.
The closing of the deck is a major milestone in the construction of this landmark bridge – one of the biggest infrastructure projects in the UK – which is expected to open in autumn 2017.
Designed by COWI UK Ltd, which was formed by the merger of bridge specialist Flint & Neill and tunnel specialist Donaldson Associates, the three-pylon cable-stayed bridge will be a landmark structure recognisable throughout the North West and beyond, providing a much-needed new crossing of the river and acting as a catalyst for growth in the region.
COWI leads the Mersey Gateway Design Joint Venture which was engaged by the Merseylink Civil Contractors Joint Venture to deliver the design of the £1.86bn scheme.
COWI Bridge Managing Director David MacKenzie commented: "I'm delighted to see the deck of this iconic bridge closed today. I'm very proud of our design team, who have worked in a highly collaborative manner with our partners to create an efficient and elegant design. I'm looking forward to crossing the bridge for the first time when it opens later this year."
A landmark design
The unique three-pylon cable-stayed bridge has pylons up to 125m high and is 2.250km long with a 1km long cable supported section. The main bridge deck is constructed from pre-stressed and reinforced concrete suspended from the pylons via high strength steel cable stays.
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.
View from the top of the South Pylon
View of the completed bridge deck
Final segment being joined
View of completed deck
The Mersey Gateway Project will be one of the largest infrastructure initiatives in the UK over the coming years. The Mersey Gateway Project has been 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 will include:
You can find out more about the project 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.
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