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Newark Dyke Bridge, Warren Truss
Trent Navigation, Newark-on-Trent, Nottinghamshire
associated engineer
Joseph Cubitt
date  1852
era  Victorian  |  category  Railway Viaduct  |  reference  SK799558
ICE reference number  HEW 1023
Newark Dyke railway bridge, as constructed in 1852, was the first major bridge to use a cast iron Warren truss configuration, later used to dramatic effect at Crumlin Viaduct (now demolished). The Warren trusses have since been replaced by rivetted steel Whipple Murphy trusses.
A Warren girder is a triangulated truss made up of a series of sloping members set between horizontal top and bottom members. It has no vertical elements. This configuration was devised by James Warren.
The original bridge at Newark Dyke (the Newark navigation branch of the River Trent) consisted of two pin-jointed Warren girder structures, one for each line of the railway. Each had a span of 259ft and was 17ft deep overall.
The upper members of the girders were circular in section, cast iron and hollow. The lower members were wrought iron flat bars. The diagonals in tension were of wrought iron and those in compression of cast iron.
The weight of the bridge and the trains crossing on it was taken by bearings mounted on the top of the trusses. Cast iron A-frames transferred the load downwards to the abutments.
Cubitt's design was replaced in 1889 because the design had gained a reputation for a lack of rigidity.
Contractor: Fox & Henderson
reference sources   CEH W&WCEH E&C
Location

Newark Dyke Bridge, Warren Truss