The Crossrail project was the biggest tunnel project in Europe to date, with around 21km of the total 118km route contained within newly bored tunnels. Soil Instruments supplied over 30,000 sensors across 15 separate sites in Central London to be used in the close monitoring of the geotechnical impact of the project. (52)
These sensors were fixed on to buildings, running rails, cut and cover tunnel sections, cast iron tube tunnels, electrical sub-stations, existing stations, viaducts and various other structures throughout Central London, as the construction work made its way between 11 London Underground lines, under hundreds of parking lots, thousands of buildings and avoiding miles of utility services.
A network of Robotic Total Stations and the online platform created by Soil Instruments specifically for the Crossrail project (UCIMS) were the most complex elements supplied. These stations were supplied in order to monitor the movements of whole buildings and railways using over 22,000 3D geodetic glass prisms, also supplied by Soil Instruments.
With the historical and commercial stakes so high, ensuring that the boring of a twin tunnel beneath London and construction of seven new stations has no significant impact on the surrounding area required extremely precise instruments and innovative systems. As well as providing close to 1,450 Electrolevel Beams, 25 Bassett Convergence Systems, 200 Tiltsensors and 270 Robotic Total Stations (RTS), Soil Instruments developed the Underground Construction Information Management System (UCIMS). This web-based, custom built data presentation suite allows various stakeholders to see relevant data in near real-time, displaying over 85,000 data points to over 578 users across the Crossrail project. (209)