On December 30, the world's largest undersea highway tunnel, Qingdao Jiaozhou Bay Second Tunnel, officially opened the shield through the sea, which is expected to be completed and opened to traffic in December 2027.
According to reports, the shield tunneling distance is 3,255 meters, from the Qingdao Port wharf to the west coast, will be docked with the drilling and blasting section of the tunnel, and in the submarine cavern for the shield machine reception, dismantling. The "Haitian" shield machine used in the project has a total length of 142 meters, a total weight of 4,275 tons, and an excavation diameter of 15It is 63 meters and equipped with a series of intelligent systems such as telescopic main drive and telescopic excavation bin monitoring system. The integration of a number of advanced technologies and targeted design greatly improve the construction safety guarantee of the shield machine and ensure that the shield equipment completes the construction task safely, quickly and efficiently. After the Jiaozhou Bay project is put into operation, Qingdao will break through the boundary of urban space growth, which is of far-reaching significance for promoting the coordinated development of the east and west shores of Jiaozhou Bay and enhancing the overall competitiveness of the urban agglomeration on the Jiaodong Peninsula.
It is understood that the second tunnel project of Jiaozhou Bay starts from Qingdao West Coast New Area in the west, crosses Jiaozhou Bay in the east, and lands near Qingdao Port, connecting the urban area on the east coast of Qingdao in the form of a viaduct, with a total length of 17 main lines48 km, of which the tunnel is 1437 kilometers, including the sea section is 995 km, the main line tunnel shield machine excavation diameter 1563 meters, the deepest point is 115 meters above sea level. The tunnel construction adopts the layout of two main tunnels and intermediate service tunnels, and the standard construction of two-way 6-lane urban expressway has a design speed of 80 kilometers per hour. (Reporter Wang Wei and Liu Dong).
*: CCTV news client).