UK tunnelling contractor Barhale comes up with an innovative tunnel boring machine design to tackle the complications of tunnelling in tight spaces. Barhale calls it "collapsible shield".
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cover tunnel photo by: Matt Brown from London, England / CC BY
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Barhale innovates Tunnel Boring Machine: Convertible TBM
https://www.barhale.co.uk/news/first-deployment-of-collapsible-shield-accelerates-emergency-works-at-hersham/
First deployment of collapsible shield accelerates emergency works at Hersham
www.barhale.co.ukFirst deployment of collapsible shield accelerates emergency works at Hersham