Crossrail C501 Liverpool Street Station
Crossrail is set to deliver a high frequency, high-capacity service to 37 stations linking Maidenhead and Heathrow in the west, to Shenfield and Abbey Wood in the east via 21 km of new twin-bore tunnels under central London. It will bring an additional 1.5 million people within 45 minutes commuting distance of London’s key business districts.
Advanced station works were carried out for the Moorgate shaft to provide ventilation and emergency access to the western end of the new Crossrail Liverpool Street station.
Work included the construction of a diaphragm wall and the removal of existing large diameter piles within the excavation.
In order to protect the Grade II listed buildings immediately adjacent to the shaft boundary at 8 Moorfields and 87 Moorgate, a steel frame was be installed within the buildings to prevent structural damage during construction of the shaft.
- Crossrail C501 Liverpool Street Station
- London, UK
- Autumn-Winter 2011
- BAM Nuttall/Kier JV
- Instrumentation Specialist
- Getec UK
- Mott Macdonald Ltd
Due to the close proximity of existing buildings, Moorgate and London Underground extensive monitoring was required under Crossrail document C138-MMD-C2-DDA-C101-Z-01011/2
Monitoring, required as part of Asset Protection as well as design validation and construction safety, was carried out by instrumentation specialists Getec UK.
As part of the first phase of monitoring a series of vibrating wire piezometers, and inclinometer casing were installed prior to the diaphragm guide walls being installed.
Initial readings from both sets of instruments were taken to ascertain the base level readings.
Further instrumentation that was installed included In-place inclinometers, Magnetic Settlement systems, additional VW piezometers, VW Strain Gauges and a data logging system.