Queensferry Crossing – Bridges & Structures
Forth Crossing Design JV is a joint venture comprising Ramboll (Denmark), Grontmij (Netherlands) and Leonhardt, Andra & Partner (Germany). The Design checking joint venture is Aecom (Leeds) and URS (Glasgow
Queensferry Crossing is the world’s longest three-span cable-stayed bridge and provides a vital transport link over the Forth estuary. Working in consortium, HOCHTIEF delivered the 2.7km road bridge, which features three towers, two approach viaducts and a two-lane motorway with hard shoulders, as well as associated road connections to the north and south of the estuary.
- 2.7km three-span cable-stayed bridge: 3 towers, 2 approach viaducts
- 2-lane motorway
- 5km dual three-lane carriageway
- Junction upgrades
- 150,000t of structural concrete
- 30,000t of steel
- 23,000 miles of cabling
- Utilities diversions
We built pier foundation caissons, temporary works cofferdams and deck sections offsite, increasing safety, quality and programme certainty. Each of the 122 deck sections – weighing up to 750 tonnes – was transported to the bridge site by barge and lifted to deck height by crane. We programmed weather-dependent heavy lifts to be completed during the most benign periods, and we built in allowance for expected lost time due to the weather to prevent delays. We also installed a pioneering windshield system, which will prevent road closures during high winds.
The bridge’s cables cross mid-span, enabling a lighter deck and more slender towers, and the steel strands within them can be easily replaced individually during normal maintenance, saving costs.
We set a Guinness World Record for the largest continuous underwater concrete pour during construction of the tower foundations, while prior to closure of the final deck sections, the 644m long balanced cantilevers were recorded by Guinness as the longest in the world.
The scheme won several awards, including CEEQUAL Excellent, Considerate Constructors Scheme Gold from 2013 – 2017, and a Green Apple Award 2014. Queensferry Crossing opened to traffic in August 2017.