On February 21, the shield excavation of the right line of Shenzhen Mawan Cross-sea Passage, which was constructed by China Railway Southern Investment Group and China Railway Tunnel Group, broke through 2000 meters, only 63 meters away from the right line, marking significant progress in the shield construction of Shenzhen's first submarine tunnel. 

Shenzhen Mawan Cross-sea Passage starts from Mawan Avenue and Yueliangwan Avenue in Qianhai Mawan Port Area and connects with Dachan Bay Toll Station of Yanjiang Expressway and the intersection of Jinwan Avenue-Xixiang Avenue. It is divided into two parts, ground, and underground roads, with a total length of 8.05 kilometers. The shield section of the Mawan Cross-sea Passage Bid 2 Project constructed by China Railway Southern Investment Group, and China Railway Tunnel Group is 2063 meters long, of which the sea area section is 1100 meters. A domestic shield, "Mawan," with a diameter of 15.53 meters, is tailored for the project. The excavation section is six times that of the conventional metro shield machine. It is the largest diameter submarine shield tunnel project in China. 

Faced with the construction difficulties, the construction team takes the process connection, equipment maintenance, and equipment utilization as the breakthrough point and relies on the extensive data platform of the intelligent shield TBM project to realize real-time intelligent monitoring and automatic early warning of tunneling parameters, and allocates full-time "parameter analysts" in shield tunneling construction. The information of geological research and judgment, slag sample analysis, tool monitoring, and sound collection are summarized, providing a solid guarantee for safe and stable shield excavation. At the same time, the design of zero discharge and slurry collection of shield machine pipeline extension is innovatively adopted, which realizes zero leakage and pollution of slurry.

http://www.crecg.com/zgztywz/10210594/10210606/10247055/index.html