The reporter learned from Beijing Tianjin Hebei Intercity Railway Investment Co., Ltd. that on the 8th, China's independently developed ultra large diameter shield tunneling machine, "Jingbin Tongxin", started from the first vertical shaft of Tianjin Binhai International Airport Tunnel 1 and excavated towards the direction of the final second vertical shaft. The "Jingbin Tongxin" has a total length of 135 meters, a total weight of about 2800 tons, an excavation diameter of 13.8 meters, and a tunnel that can be used for parallel high-speed railway tracks. This machine will be used for the construction of Tunnel 1 under the Tianjin Binhai International Airport area between Beijing and Binhai. The shield tunnel is approximately 2923 meters long and has a maximum burial depth of approximately 29.82 meters. After the shield tunneling machine departs, it will successively cross key points such as the Beijing Tianjin Tangshan Expressway, the Tianjin Han Highway, the Beitang Pollutant Discharge River, and the Li Mingzhuang Depot of Metro Line 2, entering the Tianjin Binhai International Airport Station of the Beijing Binhai Intercity Railway. Due to the sticky underground soil and the large excavation diameter of the tunnel, settlement is prone to occur during construction. The construction party has taken multiple measures to prevent risks. Develop special materials to solidify soil. Li An, Chief Engineer of the Tunnel Division of Section 4 of the Beijing Binhai Railway of China Railway Fourth Bureau, said that in some areas, builders inject special double liquid slurry synchronously into the strata, which can solidify the soil like jelly in about 20-30 seconds, control surface settlement, and ensure construction safety. Intelligent control of settlement during excavation. Li Ran, Deputy Chief Engineer of the Tunnel Division of Section 4 of China Railway Fourth Bureau's Jingbin Railway, said that the "Jingbin Tongxin" can form better excavation control parameters through deep learning based on massive construction data. In this way, surface subsidence can be significantly reduced, and the accuracy of axis control can be significantly improved. Robot installation ensures construction accuracy. The shield tunneling machine excavates about 2 meters, and the subsequent trolley will lay box culverts and pipe segments to support the tunnel. Li Ran said that a railway box culvert with a width of about 2 meters and a length of about 12.2 meters weighs about 38.2 tons. In the past, relying on machine assisted manual installation, it took at least three workers 25 minutes to install a piece. With the self-developed "six degree of freedom automatic adjustment box culvert assembly robot", one worker can install a piece in 15 minutes, with an error of no more than 0.5 millimeters. The Beijing Binhai Intercity Railway is a landmark project to build the "Beijing Tianjin Hebei on the track". The first phase of the project will be completed and opened to traffic in 2022, and the second phase will start construction in November 2022. It starts from Beichen Station in Tianjin, passes through Dongli and Binhai New Area, and connects to Binhai West Station of Jinqin High Speed Railway and Binhai Station of Jinwei High Speed Railway. After completion, the third intercity corridor between Beijing and Tianjin will be formed, further improving the regional road network structure and supporting the coordinated development of Beijing Tianjin Hebei. (Lai Xin She)
Edit：Hu Sen Ming Responsible editor：Li Xi
Source：XinhuaNet
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