The world’s top supplier of comprehensive solutions for mechanized tunneling, Herrenknecht technology, was the sole source of support for all three joint ventures. For the building of the eastern and western tunnels through the London clay, sand, and gravel, six Earth Pressure Balance Shields (EPB) from Schwanau in Baden-Württemberg/G were provided. Two Herrenknecht Mixshields dug the Thames Tunnel up to a depth of 15 meters beneath the riverbed.
At depths of up to 40 meters, the tunnel boring machines made their way beneath some of the most expensive real estate in the world, passing through existing metro lines, sewerage, supply, and disposal channels, and building foundations.
The machines are 147 meters long, have a shield diameter of 7.08 meters, can weigh up to 1,100 tonnes, and can generate up to 1,920 kW of motor power. For precise control, navigation systems from Herrenknecht subsidiary VMT were installed on all eight machines.
Twenty guys every shift, twelve on the TBM and eight on the backup, ran the machines 24 hours a day, seven days a week. Up to 72 meters (45 segment rings) might be made each day. Such outcomes are the consequence of every project participant working in perfectly timed coordination. The equipment was provided by Herrenknecht, along with all-inclusive service options. The provision of jobsite employees to support the advance, the provision of cutting equipment and spare parts, and aid with TBM installation and disassembly on construction sites were a few of these.
Watch the Amazing Tunnel Digging Process with Modern Machines and Sᴋɪʟʟed Workers in the video below.
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Video resource: NaLac Technique