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Current Refinements
National Grid
  Date 2000
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Repair, refurbish or replace?
12 December, 2000
Many tunnels built in the 19th century are still in service, but changes of use, loadings and the gradual deterioration of the structures by modern pollutants has meant that these tunnels require on-going maintenance or complete refurbishment to extend their usefulness. Gareth Mainwaring, principal engineer with Mott MacDonald's underground works and geotechnical team explains

Operation Dartford
12 December, 2000
Replacing decaying structures in road and rail tunnels is becoming an increasingly significant workload sector. Editor, Adrian Greeman looks at one such project, the renewal of the road deck in the UK's Dartford tunnels.

Start for National Grid
11 July, 2000