Key Stats
Case Study
Select was awarded the monitoring contract for the Central Section of the Thames Tideway Tunnel project by the main contractor, FLOJV. This contract covers monitoring at the eight primary shaft sites, as well as all assets and structures intersected by the tunnel boring machine (TBM) across two drive routes along the River Thames in central London.
Phase 1 of the project commenced in 2016 with the development of three shaft sites at Kirtling Street, Victoria Embankment, and Blackfriars Embankment. The remaining sites began to be established in 2017, with tunnelling operations starting in 2018 and concluding at the end of 2020. Select’s involvement in the project concluded in December 2024.
Project Requirements
- Installation and maintenance of manual monitoring points at 8 shaft sites and 19 bridges, including Grade 1 listed Tower Bridge.
- Monitoring protocols were maintained at these locations until one-year post-completion of any impacting works.
- Automated monitoring systems were installed within five London Underground tunnels and 14 additional tunnels owned by various stakeholders (BT, Thames Water Utilities Limited, National Grid, Vodafone).
- Track monitoring was conducted on five Network Rail bridges and five London Underground lines, involving track geometry surveys, laser scanning, tunnel gauge measurements, and manual target observations.
- Works included data analysis, reporting, equipment maintenance and calibration.
