2 ms·
I'd never thought about it till a knee jerk scoffing at the title: But do they need the TBM to be milimeter accurate the whole way- or do they just need mm acc
by butvacuum 2mo ago
I'd never thought about it till a knee jerk scoffing at the title:
But do they need the TBM to be milimeter accurate the whole way- or do they just need mm accurate surveying and very high accuracy when merging the tunnels?
It might seem inane- but they're two VERY different things.
- cadamsdotcom 2mo agoMy guess - a bunch of lasers, levels.. maybe some compasses... sufficiently precise instruments to gauge distance, heading, and travel-path from known above-ground reference points. A boring expert could talk all day about it :)