|Location||St Ninians, Stirling|
|Requirement||Bearing piles to support new footbridge|
|Main Contractor||Story Contracting|
Piled foundation were required to support a new Network Rail pedestrian bridge which was being constructed to replace an old level crossing on the main Stirling to Edinburgh Line.
Ground conditions in this part of Scotland are notoriously weak to significant depths.
- Working adjacent to live running line.
- Vibration restrictions, due to proximity of the rail infrastructure.
- Preliminary pile testing.
The works involved installing 84 No. low vibration bottom driven piles to a depth of up to 20m adjacent to the live running line.
Compression and tension loads were 350kN and 125kN respectively. Work was carried out very close to the live railway, so TGS’ short mast rigs were used. Full depth pile reinforcement was also installed in sections no greater than 3m to conform to the live rail fall distance restrictions. Multiple rigs were used to complete the work in the required programme.
Preliminary testing was also carried out to ensure appropriate pile capacities were achievable within the notoriously weak ground conditions present.