It is a Robbins Double Shield with a diameter of 5,06 meters.
It is reported that it bored 12,2 km in 18 months `8 months ahead of schedule' and with a progress of '1.000 m per month' (this is what Robbins says).
The China Railway Group (CREC) on Thursday announced its completion of a huge tunnel boring machine (TBM) with advanced capabilities for drilling in wet conditions, a breakthrough which the company sees as a demonstration of its world-leading...