Your browser is no longer supported

For the best possible experience using our website we recommend you upgrade to a newer version or another browser.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more

What's under the vale

CONTRACTS

CONTRACTOR GEOFFREY Osborne is nearing completion of a £1.1M pedestrian subway in Surrey that is being built with train services in operation.

The subway, in Ash Vale, Guildford, is 8m below the tracks which carry the Guildford to Reading and Aldershot Spur lines.

Osborne has jacked interlocked steel beams through the rail embankment 800mm beneath the track to form a temporary roof lining. Further steel beams were then impact rammed to create temporary side walls.

Once in place, steel frames were progressively installed for support as soil was mined out.

The permanent concrete subway is now being formed inside the steel structure.

Engineering director Derek Hughes said: 'The pre-installed beam lining was made using beams that were small enough to avoid track heave or risk dragging the tracks horizontally, but robust enough to ensure there was minimal deflection when they were loaded during the mining operations and when trains went over them.'

Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Please note comments made online may also be published in the print edition of New Civil Engineer. Links may be included in your comments but HTML is not permitted.