Barnhault Road Bridge - Carrickfergus

A new bridge over a live railway required piling. Working in such close proximity to to the live railway line required a low vibration solution. Health and Safety requirements meant that were the piling rig to topple it could damage the rail line causing huge delays and therefore costs. As a result a small yet very stable mini piling rig was required. Working in conjunction with F.P. McCann (Main Contractor) and Brian Bell (Engineer), Larsen submitted a value engineered solution using Bottom Driven Mini piles satisfying all Road Service requirements.

  • 106No 219mm piles
  • 6m average piles
  • Up to 250kn SWL
  • 6 Case Tests
  • 1 CapWap Analysis
  • Vibration monitoring was carried out at all times to a PPV of 5mm/s using our Alarmed Vibration Monitors
  • No spoil
  • No wasted pile cut off generated
  • Main contractor - F P McCann
  • Engineer - Brian Bell Associates

The piling works on this project was featured in the Structural Engineer (March 2007 edition) as published by the Institute of Structural Engineers.  The report commented favourably on the economical piling solution provided by Larsen in meeting the requirements of DRD Roads Service.


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