Reply on topic: Brenner Base Tunnel: A Masterpiece of Engineering in Europe
It is bored by Herrenknecht TBMs. https://tunnelcontact.com/discussion/view/4079/karin-baeppler-of-herrenknecht-explains-tunnel-boring-in-complex-conditions-%E2%80%93-insights-into-europe%E2%80%99s-brenner-base-tunnel-projectReply on topic: Kolkata Tunnel causing houses collapse: Water leak returns after early success,
As i knew that TBM at that time was under sandy strata with water bearing table, tailskin brushes got damaged but TBM was advancing, water and grout was ingress into tunnel through brushes, annular gap could not filled.Reply on topic: Boring of 2nd Metro Tunnel for New İstanbul Airport (New Atatürk Airport) to start
Dear @Zaka, E=BERK is not using an E-BERK TBM in project. A renovated second hand TBM is used for low cost. E-BERK is a subcontractor here. Main contractor puts constraints on cost and so. In Turkey second hand TBMs cheaply renovated and become tunnel ready again.Reply on topic: Boring of 2nd Metro Tunnel for New İstanbul Airport (New Atatürk Airport) to start
OK. If we filter out all the excuses, the bottomline is: e-berk does not use its own TBM in its own project.Reply on topic: Here are the 3 Engineering options to solve the Kolkata Metro East-West line mess
All these options hint a tunnel boring machine screw up. Obviously the TBM is damaged beyond repair. Either because of bad operation or because it was crap in the first place. Can anbody comment on the brand/model of the TBM and whether it was a new one or a renovated one?
cover tunnel photo by: Matt Brown from London, England / CC BY
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