Early breakthrough for TBM

摘要

ARobbins Double Shield TBM working in the Himalayas mountain range has broken through about one year ahead of the overall project schedule, and seven months ahead of the tunnel boring machine (TBM) tunnelling schedule. The 5.06m diameter TBM achieved over a 1,000m monthly advance on two separate occasions and averaged over 700m per month over the course of tunnelling.