Pressure Relief Shafts/Weedon Tunnel Repair

Client: Railtrack / Birse rail
Project Value: £1,850,000
Scope:

Four 2.7m diameter, pressure relief shafts up to 30m deep, were sunk by underpinning, either side of the 500m long Weedon tunnel as part of the upgrade to the West Coast main Line. Once invert levels were reached, 3 to 5m long 2m square rectangular adits, constructed of reinforced concrete, connected each shaft to the running tunnel to allow the air pressure to balance as trains passed through the tunnel simultaneously.

During this contract additional works to improve the brick built structure were awarded to Delta which consisted of sprayed concrete repairs and grouting of the annulus, which was carried out during pre booked weekend possessions.

Monitoring equipment was installed prior to any shaft sinking / tunnel refurbishment works commencing as a precaution, to detect any movement in this 140 year old structure.

Pressure Relief Shafts/Weedon Tunnel Repair

Pressure Relief Shafts/Weedon Tunnel Repair

Pressure Relief Shafts/Weedon Tunnel Repair

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