Meet Crossrail's giant tunnelling machines

Crossrail will use eight tunnel boring machines (TBMs) to construct the new tunnels under London. These huge machines will work 24 hours a day beneath the ...
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47 thoughts on “Meet Crossrail's giant tunnelling machines

  1. I know that these drills don't work in reverse and construction companies have to dig above and in front of these drills a 2 lane wide hole above ground straight down to do maintenance.

  2. Building a railroad tunnel should not be made along a marathon runner (10-60 km), it must be at least minimum of 65 km and a maximum of 6,500 km according to the type and criteria of trains passing in the tunnel. And also the construction of a railroad tunnel project must be within a minimum of 10 – 100 meters from underground, an underwater rail tunnel 10 – 200 meters below the deepest sea level (ocean) and the seabed 10 m – 500 m on the seabed, based on international railway project development regulations in 2010

  3. If the train crashes or chemical tankers rupture or just anything that can happen, how would a rescue operation occur? Above ground, ruptured tanks aren't confined and rescue crews can come to help. Surely engineers would have this figured out, so I'm curious.

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