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Infographic on measures used by STP to remove the steel well casing blocking the Bertha TBM

Attempting to Remove the Pipe Blocking Bertha

January 14, 2014 rockman Comments Off

The Seattle Tunnel Partners JV is attempting to remove the rest of an 8 inch diameter steel well casing that has been blocking the Bertha tunnel boring machine since December 8, 2013. The upper 55 […]

Preston tunnel project, Lancashire, UK, where TBM is stuck

Contractors battle to extract TBM after silt breaches tunnel

February 28, 2011 rockman Comments Off

A TBM is stuck on a 2.85m diameter stormwater tunnel in Lancashire, UK. The tunnel is planned to be 3.5-km long, but has been stalled since November when the silt intrusion stopped the tunnel boring […]