HS2 has lifted its second TBM ‘Caroline’ from below ground at the Green Park Way site in Greenford, West London after a successful 8km journey under London. On Sunday 25th May, engineers working on the HS2 project lifted the Herrenknecht TBM’s 9.48m diameter cutterhead, front and middle shield, weighing 850 tonnes, using a large gantry crane. The tunnelling machine concluded its journey from West Ruislip in April, arriving in an underground reception chamber. TBM Caroline excavated over 1.2 million tonnes of earth and installed 4,217 tunnel rings.
TBM Caroline, named by a local school after the astronomer Caroline Herschel, was used to construct part of the Northolt Tunnel – an 13.44km tunnel being built by four TBMs which will take HS2 trains from Old Oak Common Station to the outskirts of the capital. The first machine to arrive at Green Park Way, named Sushila, was removed in March this year.
The Northolt Tunnel is being construted by the Skanska, Costain and Strabag joint venture (SCS JV).
A selection of images of the removal are available for download: https://mediacentre.hs2.org.uk/resources/f/construction/london-tunnels/progress-3/northolt-tunnel/tbm-caroline-removal
Herrenknecht
Pioneering Underground Technologies - Herrenknecht AG is the technology and market leader in mechanized tunnelling. As the only company worldwide, Herrenknecht delivers cutting-edge tunnel boring machines for all ground conditions and in all diameters - ranging from 0.10 to 19 meters.
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