31 71 00
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Tunnel Excavation
Includes moles and tunnel-boring machines. rock excavation by boring machine, drill, and blast. robotic processes.

31 71 00 Tunnel Excavation
31 71 13 Shield Driving Tunnel Excavation
31 71 16 Tunnel Excavation by Drilling and Blasting
31 71 19 Tunnel Excavation by Tunnel Boring Machine