Bridge Over North End, London Bridge Station

SOUTHWARK

TQ3374SE JOINER STREET 636-1/17/869 Bridge over north end, London Bridge 08/01/98 Station

II

Bridge. 6 composite cast- and wrought-iron trusses built to James Warren's 1848 patent. Reconstructed after collapse of newly-built original in 1850. Constructed to carry extension to London Bridge Station forecourt. Converted to pedestrian use in 1890. Span varying from approx 15m to approx 21m, depth approx 1.6m. Spaced at approx 4.2m centres, beneath flat-soffit, solid deck of original cast-iron plates. Comprised of individual panels of cast-iron in form of 60 degree triangles, bolted together at top corner to form chord. Downward pointing apexes pinned to bottom chord of wrought-iron flat chain, each approx 152mm x 3mm (6in x 5/8in). A rare survival of a structure assembled from cast- and wrought-iron components forming a Warren truss. Illustrative of structural thinking in the 1840s, in which the two forms of iron were used compositely. The tendency of cast-iron to fracture led to a preference for wrought-iron in such situations.

Listing NGR: TQ3290080260