As part of Network Rail's plan to introduce electric services on the Edinburgh-Glasgow Central via Shotts Line, BAM Nuttall were appointed to carry out route clearance works. This involves works to bridges to ensure that the power cables can run under structures on the line. MHB Consultants have designed temporary works associated with a number of these structures over the last year. An example is the removal and replacement of a road bridge carrying the A71 over the railway in West Calder. The temporary works designs carried out by MHB included:
• Working Platforms for grouting mine workings - Working platforms were required at the four corners of the bridge to carry out the grouting of the historic mine workings. The existing embankment required to be extended to provide a platform for the drilling rigs to reach the extents of the grouting works. The design involved slope stability analysis and settlement calculations.
• Temporary Footbridge Foundations – To maintain access for pedestrians and a service route, a temporary bridge was designed by Jansons. MHB designed the foundations including bank seats and tower foundations.
• Crane Outrigger Foundations for various stages of the works.
• Piling Platforms.
• Abutment Stability Analysis during various stages of the demolition.
• Temporary excavation support adjacent to the track to enable the construction of the permanent bridge foundations.
• Temporary stability of proposed precast units during installation.
• Platform Hoarding throughout the works.
• Precast concrete lifting anchor checks for the proposed bridge units.
The works were successfully completed in early 2017 by main contractor, BAM Nuttall.
photos courtesy of BAM Nuttall