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Contractors World  - UK & Ireland
2014 Vol 4 No 3
 

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Steel Beams Curve Over Manchester Victoria Station - Page 3 of 3

The new roof structure has been designed to allow natural daylight to flood the station. The 1.2 m deep and 500 mm wide ribs have been curved by Barnshaws to multiple radii over the length.

 

Time lapse showing steel beams being craned into position at Manchester Victora Station.
© 2014 Network Rail

 

They are being fabricated by Bolton based Severfield-Watson Structures Ltd in welded box sections up to 24 m long.

the use of lightweight, transparent and self-cleaning ETFE cladding has enabled the steel ribs to span further        Once on site, the sections are welded together to form single ribs up to 96 m long, before being lifted into position by a 750 tonner crawler crane. Each rib is lifted as a single piece and almost simultaneously connected at 4 m high buttresses and 18 m high columns.

A key design focus has been to achieve as lightweight a roof structure as possible, without compromising its strength.

Steel was therefore selected ahead of heavier options, such as timber. Additionally, the use of lightweight, transparent and self-cleaning ETFE cladding has enabled the steel ribs to span further than if traditional glazing had been specified.

Commenting on Barnshaws’ involvement, Gary Dooley, Project Manager for Severfield-Watson Structures Ltd said: "We have worked with Barnshaws on many previous projects and the fact that they also have a factory in Manchester made our decision very easy."

The project is due to complete in early 2015. [CW]

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