Gerrards Cross Tunnel Gerrards Cross, BUCKINGHAMSHIRE - UK

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Tunnel Monitoring Automated Cyclops monitoring with alarm system Gerrards Cross Tunnel Gerrards Cross, BUCKINGHAMSHIRE - UK Rapid mobilisation of automated monitoring system to verify tunnel stability On 30th June 2005 Gerrards Cross railway tunnel suffered a partial collapse. Sol Data were approached to undertake the monitoring of the tunnel structure which is used to accommodate rail services on the South Buckinghamshire train line to and from central London It was essential to confirm the structural stability of the tunnel in order to allow mainline rail services to re-start. Jackson Civil Engineering looked to Sol Data to design and install an appropriate monitoring system. Sol Data mobilised to sit e and installed 4 CYCLOPS monitoring system and 300 prism targets. Above – Installation inside the tunnel of the CYCLOPS systems using a ‘Cheery Picker’. Below – The Tunnel is re-activated under the safe watch of the CYCLOPS systems. The system was installed, configured and commissioned within 1 week, and when Network Rail were satisfied that the structure was being closely scrutinised for any potential further movemen t decided to restart mainline rail services, mitigating the financial loss to the network operator and ensuring the safety of passengers using the service. The system is operational 24 hours a day and transmits the recorded co- ordinates of the prisms to a central processing computer, allowing the team of on-site engineers to determine the stability of the tunnel immediately. QUICK FACTS • 4 No. CYCLOPS Units. • 300 Prism Targets. • Real-time 3D monitoring of OWNER : NETWORK RAIL absolute prism co-ordinates. CONTRACTOR : JACKSON CIVIL ENGINEERING • Alarms configured to predefined limits. PROJECT DURATION : AUG 2005 ONWARDS • Data visuals via web access. SCOPE OF WORKS : • Rapid design, installation, commissioning and maintainence of monitoring system. • Remote technical support from Sol Data HQ and web data access. • Remote archiving of all data on Sol Data’s Secure server systems at Sol Data HQ. www.soldata.co.uk .

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