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NCE100 profile | Flint & Neill

Flint & Neill is an engineering consultancy providing innovative and advanced solutions to a variety of  clients for their civil and structural engineering challenges.

Flint & Neill was established in 1958 and specialises mainly in the design, analysis, construction and maintenance of bridges, buildings, masts and towers and other structures.

In particular, the firm has developed an excellent reputation in the field of major long span bridges, and for the design of innovative and unusual structures. 

The firm became a subsidiary of the COWI Group in 2008 and forms part of its international bridge, tunnel and marine structures division. Based in the UK and working on projects large and small around the globe, Flint & Neill has access to considerable engineering, environmental and planning resources through the worldwide COWI network.

flint and neill

flint and neill

This has also allowed the firm to venture into newer fields requiring similar engineering skills, adding tunnels, offshore wind farms and other marine structures to its portfolio, along with the ability to tackle ever larger and more diverse challenges.

Flint & Neill’s defining strength remains its commitment to solving problems through a sound understanding of structural behaviour; never being afraid to move outside the scope of codes and standards to apply engineering first principles where necessary. This approach has regularly enabled it to tackle new problems of significant complexity and has led to its involvement with the development and drafting of codes of practice for a variety of engineering applications.

One recent project is due for completion at the end of May this year. The newly named Osman Gazi Bridge in Turkey has a suspended central span of 1,550m with two 566m long side spans. The bridge will be the world’s fourth longest suspension bridge, carrying a new six-lane highway across the Sea of Marmara, 50km south of Istanbul and close to the highly seismic North Anatolian Fault.

Japanese firm IHI Infrastructure Systems commissioned COWI under a design and build contract to prepare the detailed design for client, Nömayg (Nurol-Özaltın-Makyol-Astaldi-Yüksel-Göçay Joint Venture) under a concession from the Turkish General Directorate of Highways. As part of an $11bn (£6.8bn) PPP scheme to build a new 433km motorway, the new bridge will shorten journey times between Turkey’s two largest cities, Istanbul and Izmir, from nine hours to three-and-a-half hours. 

Flint & Neill provided services throughout the tender design, detailed design and construction phases of the project, with particular responsibility for the 2,680m long orthotropic steel deck structure. 

One of the first major bridges to be designed to Eurocodes, Flint & Neill and COWI worked hand-in-hand with IHI to realise the technological advancements available within the new codes and deliver an efficient, economic design tailored to the contractor’s preferred erection methods. After prefabrication in Turkey, the deck was delivered to site and erected using floating cranes and main cable gantry cranes at a rate of up to 175m per day. The final deck segment was lifted into position on 21 April 2016, closing the full length of the bridge deck. 

Flint & Neill also helped design the bridge’s structural health monitoring system as well as providing geotechnical design and client liaison services. 

Flint & Neill is currently working as leader of the design joint venture team for Mersey Gateway and lead designer for the Bouygues TP-Cimolai team for Garden Bridge. Also part of the winning design team chosen for the Nine Elms Bridge.

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