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Stockport Road Railway Bridge
Stockport Road (A6), Rusholme, Manchester, UK
Stockport Road Railway Bridge
associated engineer
British Rail
date  1959 - 1960
era  Modern  |  category  Bridge  |  reference  SJ869953
ICE reference number  HEW 2681
photo  Paul Dunkerley / ICE R&D Fund
A prestressed precast reinforced concrete skew bridge carrying the Manchester branch of the West Coast Main Line, the busiest long-distance main line in Britain. The bridge was rolled into position during a 30-hour rail possession.
Stockport Road Bridge was built during the 25kV overhead electrification of the main line and modernisation of the tracks, including realignment of the Slade Lane (A6079) junction to the north west of the bridge. It crosses the road at a skew angle of 35 degrees.
The bridge replaced an 1840 wrought iron girder bridge (No. 23) of the Manchester & Birmingham Railway designed by George Watson Buck. The original double track structure had a 17.4m skew span over the road, flanked by stone arches with 5.2m skew spans over the footways.
In the 1880s, two more two tracks were added on the east side by the construction of an independent structure. This had two main wrought iron box girders spanning 34.1m between bearings, the inner girder being continuous over three spans and supported by cast iron columns.
The new structure has four reinforced concrete box girders, each carrying one track. The side box girders also carry cantilevered footways with railings. Each box girder is supported at four points, effectively creating three span continuous beams 2.3m deep with central spans of 32.6m and side spans of 4.9m.
Each box girder was factory precast in 2.4m wide sections and was assembled and prestressed on site adjacent to its final position. Concrete diaphragm walls 200mm thick were cast between the units in situ, and the whole girder was prestressed as one element.
The bottom slab of each girder has 16 Magnel-Blaton prestressing cables formed from 72, 7mm diameter wires, which have anchorages at the ends over the abutments.
Chief engineers: A.N. Butland, J. Taylor Thompson
Assistant engineer: Frank Turton
New works officer: A. Lloyd Owen
Research: PD and AJD
bibliography
"Three Prestressed Concrete Railway Bridges" by Frank Turton
Paper 6537, ICE Proceedings, Vol. 20, September 1961, pp.1-18
and subsequent Discussion pp.317-330
Location

Stockport Road Railway Bridge