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Retaining Structures – A83 Rest and Be Thankful

ITM Monitoring has been working with Maccaferri for several years to design an effective monitoring system for their rockfall, debris flow and drapery fences. Throughout this development period both companies have consulted on a regular basis to devise the most reliable, accurate and verifiable monitoring system.

Summary of the works

  • Client – Maccaferri
  • Contract name – A83 Rest and be Thankful
  • Start Date – May 2014
  • Completion Date – Ongoing
  • Instruments: Monitoring System, Fence Monitoring System, GPRS Camera, and ARGUS monitoring software

After discounting an accelerometer based system due to the high likelihood of false alarms, it was agreed to develop a bespoke system for measuring key parameters of the Maccaferri fence.  The monitoring system is data logged with an extremely power efficient logger, capable of logging and reporting on batteries alone for in excess of 18 months and can be used to alert stake holders to the occurrence of a major slope failure or the need for a maintenance inspection of the fence.

The Rest and Be Thankful pass on the A83 trunk road in the West of Scotland has long been a challenging asset to maintain, due to frequent debris flows especially in the past year during which the road closed four times.  To mitigate the risk of debris flows at this site, Maccaferri were called in to design and supply 18nr debris flow fences to protect the road from inundation. As part of the risk mitigation strategy ITM Monitoring installed a fence monitoring system, along with a GPRS camera with infra-red light, in order that live images can be used to validate data from the sensors. All data and images are viewed on line via the ARGUS Monitoring Software.

 

A38 Rest and be thankful rsz

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