ITM wins construction monitoring contract for Tottenham Court Road over station development

Tottenham Court Road station is undergoing a major upgrade as part of Crossrail 1 the Elizabeth Line project, involving the construction of a new over station development. Located on the corner of Oxford Street and Charing Cross Road directly above the existing station, this 285,000 sq ft mixed-use scheme will comprise office and retail space across two buildings.

Having worked with McGee, one of the leading demolition contractors in the UK, on monitoring the impact of the demolition works on this development site, we’re pleased to have been awarded the monitoring contract for the main works construction phase too. Click here to read more about the demolition phase.

Working with Gardiner & Theobald, the monitoring system – specified by ARUP – is required to measure the impact of the construction works on structures across two sites, safeguarding the London Underground and Crossrail platforms and running tunnels directly below the construction works.

The system monitoring the London Underground assets will utilise arrays of prisms in the Northern and Central line tunnels and platforms, with manual surveys recording the resulting data. Electrolevel beams and tilt sensors will feature underneath the escalator trusses as well as arrays of tiltsensors and MEMS beams above the escalators, hidden behind the ceiling cladding panels. Electrolevel beams will be installed in four cross passages, along with multiple arrays of manually read prisms and precise levelling points in cross passages and public areas throughout the station and in back of house locations.

At the Crossrail site, strings of electrolevel beams will monitor the platform and running tunnel, as well as featuring crackmeters installed within three passageways where they interface with the main station box.

In addition to monitoring these below ground structures, further instrumentation will be installed above ground on some of the buildings ITM has been monitoring during the demolition works. All data will be delivered to the client team through ITM’s in-house data visualisation software Calyx OMS, providing automated alerts to any movement threshold breaches and a monthly report for the client.

Simon Hough, Project Manager at ITM Monitoring, comments: “Currently in the documentation phase of this project, we are conducting site visits in order to define how the instruments specified in the monitoring design plan will be installed and where power and communications will be run. With construction due to begin early next year, we are planning to install all instrumentation over the next few months, with a view to getting the equipment up and running to record some baseline data before construction commences.”