Excavator Loader
January 11th, 2006
Tunnel ventilation in subway systems?
How do they ventilate subway tunnels when they are building them? Obviously they cant use just electric vehicles to create stations and tunnels. TBMs are electric but they must use excavators, loaders, etc when building stations beneath the surface. How do they ventilate these tunnels?
There are several methods that have and are employed to make tunnels.1
Why do you feel it is “obvious” that electric machines cannot be used? Tunnels are the type of spaces with limited air that are ideal for the use of non polluting vehicles. Rather than say “We have to make pollution, how can we move it somewhere else” engineers have asked, “How can we not pollute the air.” Subways are electrically powered. Modern tunneling machines are probably the very largest electric vehicles.2 Some of the machines have their own power stations located outside of the tunnels and some of the machines will use a grid connection. In most pictures of tunneling you will notice either a conveyor belt or a railroad removing debris.Both of these are also easily electrified.
Formerly shafts were sometimes run to the surface for removing debris. And this may continue to be a solution for ongoing operations. There is an island in the middle of the East River in NYC outside of the UN that was formed from tunneling debris for the #7 subway line.3
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