The "Tunnel Crossing" shield machine responsible for the "sea crossing" task of the Nansha Zhuhai (Zhongshan) intercity railway (referred to as the South Zhuhai (Central) intercity railway) successfully departed on the 28th. This shield machine with a cutterhead diameter of 13.61 meters will complete a tunnel excavation task of over 3000 meters, creating conditions for the future underground connection of Guangzhou and Zhongshan in rail transit. On the 28th, the shield machine "Tunnel Crossing" for the cross sea tunnel of the South Zhuhai (Central) intercity railway started its excavation task. The picture is an overhead view of the construction site. According to the construction plan, the "Tunyue" shield machine started from the Xianger shield well, moved eastward along the north side of Hexin Road, Zhongshan City, and then went down the Hongqili waterway at the mouth of the the Pearl River to the northeast to reach the Shishichong Station in Nansha, Guangzhou. The total length of the tunnel from Xiang'er shield well to Ershichong section is 3156.87 meters, including 1430 meters of underpass waterway. According to Sun Difei, the person in charge of the Zhongshan section of the Guangzhou Metro South Zhuhai (Central) Intercity Project, the "Tunnel Crossing" shield tunnel faced the risk of deep and rich water sand layers at the beginning, then crossed waterways for a long distance in weak and rich water layers, and crossed sensitive buildings (structures) such as high-speed bridges and municipal roads at close range. Finally, it reached the receiving end under the condition of covering soil with less than 0.7 times the tunnel diameter. It is the shield tunnel with the longest single head excavation distance and the most complex geological and environmental risks on the entire line. After organizing expert discussions and technical breakthroughs, the construction unit has decided to use a slurry balance shield machine with an excavation diameter of 13.61 meters for excavation construction, allowing the tunnel to be formed in one go and minimizing construction risks. On the 28th, the shield machine "Tunnel Crossing" for the cross sea tunnel of the South Zhuhai (Central) intercity railway started its excavation task. The picture is an overhead view of the construction well. The "Big Mac" shield tunneling machine "Tunnel Crossing" used for construction has a total length of 137 meters and a total weight of about 3500 tons. It is equipped with a monitoring system that can provide excavation parameters and machine conditions at any time; The synchronous dual liquid grouting function can effectively improve the quality of the formed tunnel. Li Yanqing, Executive Deputy Manager of the South Zhuhai (China) Intercity 2 Section 4 Project of China Railway Tunnel Bureau, stated that the project department will rely on the intelligent construction system of shield tunnels of China Railway Tunnel Bureau Group, fully apply intelligent technology, and strive to reduce the construction risks of large-diameter shield tunnels crossing rivers and seas, and strive to build high-quality green and environmentally friendly projects. As of now, the civil engineering of the Guangzhou section of the South Zhuhai (Central) intercity railway has been completed by 48%; A total of 13 shield tunneling machines are currently excavating. The civil engineering project of Zhongshan section has been completed by 18%, and a total of 3 shield tunneling machines are currently excavating. (New Society)
Edit：Lubaikang Responsible editor：Chenze
Source：chinanews.com
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