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Search results with tag "Jacked box tunnelling"
JACKED BOX TUNNELLING - Norwich Engineering Society, …
www.engineeringsociety.co.ukJACKED BOX TUNNELLING Using the Ropkins System TM, a non-intrusive tunnelling technique for constructing new underbridges beneath existing traffic arteries DR DOUGLAS ALLENBY, Chief Tunnelling Engineer, Edmund Nuttall Limited