The first Crossrail tunnel was constructed after 17 months, by Phyllis TBM which completed its 4.2miles route from Royal Oak to Farringdon Station. Almost 1.1 million tonnes of material have been excavated.
Phyllis is one of the eight tunneling machines used for the construction of the 26miles new railway beneath London. This map shows the current construction work and the location of the TBMs. The depth of the construction is up to 40 meters. According to the ground conditions two different types of TBM are suitable, EPB and Slurry. Six Earth Pressure Balance Machines (EPB), including Phyllis, are scheduled to pass through the major part that consists of London clay, sand and gravels and two Slurry TBMs through the part consisted of chalk. The external diameter of the machines is 7.1m and the inside, after placing the concrete segments, remains 6.2m. According to Crossrail Ltd, their operation is constant in order to avoid the risk of settlement and all the excavated material will be reused. The railway will be completed by 2018, as scheduled by the Crossrail construction program.
See the embedded video under ''Media'' for more information about TBM operation.
Source: crossrail.co.uk
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