The Extraordinary Noise-reduced Modular Expansion Joints of the Queensferry Bridge

The recent construction of the spectacular Queensferry Crossing across the Firth of Forth in Scotland required the use of some extraordinary components, such as the modular expansion joints which accommodate the long deck’s exceptionally large longitudinal movements of up to 2300 mm. To minimise noise from vehicles as they cross the joints, they are equipped with noise-reducing surface plates at the driving interface, and flexible noise-absorbing membranes to tackle noise emanating from the underside of the joints. The largest joints, each with a length of over 17 m, a width of over 5 m and a weight of 55,000 kg, are among the largest-movement modular expansion joints ever manufactured, and the largest that feature noise-reducing surface plates. The design, supply and installation of the joints is described.