The world's largest shield machine for railway construction, a tunneling device with a diameter of 15.4 meters, excavates its 1,000th ring segment on Sunday to reach 2 kilometers, a milestone in the ...
FANG ZHE/XINHUA The world's largest shield machine for railway construction, a tunneling device with a diameter of 15.4 meters, excavated its 1,000th ring segment on Sunday to reach 2 kilometers, a ...