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M25 Gade Valley Viaduct – Innovative Rolling Access Deck

About the project

A clever solution to work on the underside of a motorway bridge was a rolling deck scaffold.

The deck was 65% smaller than a full-length deck. This saved erection and dismantling time, improved safety risk and reduced material quantities.


  • 25 working days was saved on erection with less crane hire, night work, noise and disruption to neighbours
  • Dismantling was less, saving 12-15 days
  • Less time was spent working at height and working over water
  • The Grand Union Canal remained navigable, and there were savings on the over sail licence

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