[Shantou Bay Tunnel Ludao No. shield machine off the production line] On February 21, 2023, a Tunjima shield machine with the pattern of a brave tiger shark painted on the cutter head was completed and rolled off the production line smoothly. This is a domestically produced large-diameter mud-water balance shield machine jointly built by China Railway 14th Bureau and China Railway Construction Heavy Industry Group. It will be used in the construction of the Shantou Bay Tunnel on the Shantou Guang'ao Port Area Railway, and will soon start a journey through the sea. Shantou Guangao Port Railway is located in Shantou City, Guangdong Province. It starts from Shantou Station of Guangmeishan Railway in the north and ends at Guangao Port in the south. The Guangzhou-Macao Port Area Railway Line 1 has a total length of 17.116 kilometers, including a tunnel, two bridges and other construction content. The Shantou Bay Tunnel is a key and difficult control project of the project, with a total length of 9965 meters, of which the shield section is 2990 meters long. The segment has an outer diameter of 12.9 meters and an inner diameter of 11.8 meters. The excavation diameter of the cutter head of the Tunnel Tunneling Machine on the Gudao Island is 13.42 meters, the total length of the shield machine is 126 meters, the weight of the whole machine is about 3,300 tons, and the total installed power is 9,300 kilowatts. The shield cutter head has the functions of normal pressure tool change, hob exchange, hob wear detection, speed detection, and temperature detection. In order to deal with the problem of low construction efficiency in hard rock formations, the distance between cutterheads and cutters of the shield machine has been further reduced, and pressure hobs have been added to help improve rock breaking efficiency. The cutter head is equipped with a total of 185 cutters, of which 89 can be replaced under normal pressure, realizing full coverage of the cutter head's excavation trajectory. Editor / Zhao E

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