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I don't understand why lack of space above ground is a hindrance to building new ventilation shafts. Surely these aren't going to be wider than a sidewalk, and
by avar 9y ago
I don't understand why lack of space above ground is a hindrance to building new ventilation shafts. Surely these aren't going to be wider than a sidewalk, and in central London the distance between any two roads on a block is rarely more than 50-100 meters.
You'd end up with lots of ventilation grates on the sidewalks on the surface, but that seems like an easy and space efficient solution.
- eponeponepon 9y agoA substantial part of the problem is the sheer age of central London; people have been digging beneath it and piling more buildings on top of it for nearly 2000 years, so given any particular spot in the Tube network, there's every chance that if you try and drill upward from it, you'll hit part of the sewer system, a buried river, someone's wine cellar, something top-secret belonging to the state, a lost graveyard, a plague-pit...
- pbhjpbhj 9y ago... utilities too. There are probably not many spaces a vertical shaft could go. You probably don't want a direct vertical grate either, you'll need to catch water, rubbish, people from falling down. An S-bend is going to effect flow.