How many miles per day can a tunnel-drilling machine advance while drilling a tunnel?
“The Herrenknecht S-373 Double Shield is optimally suited for this kind of geological conditions. Since the start of excavation in July 2007, the machine has achieved world records in hard rock with a best daily advance rate of 83.2 meters and a best weekly advance rate of 430.4 meters. After a best monthly performance of 1,000 installed segment rings achieved in November, the TBM exceeds the 75-percent mark in the first of the two tunnels already in early December 2007.” Source: http://www.herrenknecht.de/index.
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