On April 29, the reporter learned from the China Railway Shanghai Bureau Group that today in Chongming District, Shanghai, the estuary of the Yangtze River, the world's largest diameter GT shield machine independently developed by China - Shanghai-Chongqing-Rong GT Chongtai Yangtze River Tunnel "Pilot" shield machine was successfully launched, officially starting the journey across the river, marking the major progress in the construction of the Shanghai-Nanjing section of the Shanghai-Nanjing to Hefei GT project. It is understood that the "Pilot" domestic GT shield machine has a total length of 128 meters, a total weight of about 4,000 tons, and a maximum diameter of 15.4 meters, which is currently the world's largest diameter GT slurry balance shield machine, integrating advanced tunnel intelligent construction systems at home and abroad - "eight intelligent two synchronizations": intelligent tunneling, intelligent assembly, intelligent collaboration, intelligent diagnosis, intelligent detection, intelligent component production, intelligent material management, intelligent ventilation; Synchronous pushing, synchronous lining. Have the ability to think independently, analyze intelligently, and make independent judgments.