A new video from Scotland today that reveals a new rail bridge, weighing in excess of 2,000 tonnes, sliding into its final position over what will become the new M8 motorway, to join the existing Cutty Sark rail bridge at Bargeddie, Glasgow. The three minute video footage shows the complex engineering challenge beginning with the onsite construction of the bridge, the possession of the railway line and the bridge slide, and concludes with footage of the all important rolling stock making an appearence with the first passenger train successfully crossing the new bridge as scheduled.
The completion of the bridge slide marks a significant milestone in the progress of the project and has been the culmination of months of meticulous planning and preparation between Scottish Roads Partnership (SRP), the contractor responsible for delivering the project, and its construction joint venture, Ferrovial Lagan. SRP, the consortium responsible for designing, building, financing and operation the project, took possession of the rail line on 11 July, and returned it to Network Rail on 26 July as programmed, with rail services resuming the following day.
Graeme Reid, Project Sponsor for Transport Scotland, said: “The success of the bridge slide marks a significant milestone as part of the M8 M73 M74 Motorway Improvements Project and is the first tangible improvement to the transport infrastructure. The time lapse gives a real sense of the challenges involved in delivering a project of this scale and encourages a greater understanding of civil engineering schemes and the benefits they can bring.”
Dario Saavedra, construction manager for Ferrovial Lagan Joint Venture, said: “The installation was complex due the strict limit on time as a result of the railway closure. The operation included the removal of the existing railway infrastructure including overhead lines, rail tracks and the embankment, before the steel and concrete bridge could be pushed into its final position over the pre-cast piers to carry the weight of the structure.”
The construction team used a Self-Propelled Modular Transporter (SPMT) system to slide the 2,000 tonne structure into place. Six SPMT platform vehicles, fitted with row upon row of rubber wheels were moved into position under the structure to carry the weight of the bridge to the ground. A computer controller was used to simultaneously drive the six SPMT platforms carrying the bridge structure 50 metres north, in an operation that lasted approximately four hours. For more detail on the Scottish rail bridge project visit this page from Transport Scotland.
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