The first high-speed railway tunnel in Chongming has entered the construction of the main structure, and the open excavation foundation pit at the exit of the Chongtai Yangtze River Tunnel has been excavated to the bottom of the Yangtze River | high-speed railway | tunnel
On August 3, 2023, the builders were constructing the tunnel foundation pit.
![The first high-speed railway tunnel in Chongming has entered the construction of the main structure, and the open excavation foundation pit at the exit of the Chongtai Yangtze River Tunnel has been excavated to the bottom of the Yangtze River | high-speed railway | tunnel](https://a5qu.com/upload/images/96907c2f95bbef89da264bf27ee58a06.jpg)
On that day, the open excavation of the foundation pit at the exit of the Chongtai Yangtze River Tunnel in the Shanghai Nanjing section of the Shanghai Chongqing Chengdu high-speed railway marked the beginning of the main structure construction phase for the first high-speed railway tunnel in Chongming. The open cut foundation pit at the exit of the Chongtai Yangtze River Tunnel is located in Miaozhen, Chongming District. This foundation pit provides conditions for shield tunneling, well excavation assembly, and commissioning, and is a key control link for the entire Shanghai Chongqing Chengdu high-speed railway line.
![The first high-speed railway tunnel in Chongming has entered the construction of the main structure, and the open excavation foundation pit at the exit of the Chongtai Yangtze River Tunnel has been excavated to the bottom of the Yangtze River | high-speed railway | tunnel](https://a5qu.com/upload/images/75fce068ba456f084efccba40162b4de.jpg)
The cutter head diameter of the shield tunneling machine for the Chongtai Yangtze River Tunnel on the Shanghai Chongqing Chengdu high-speed railway is 15.4 meters, with a total length of about 128 meters and a total weight of about 2600 tons. It is currently the world's largest high-speed railway tunnel diameter shield tunneling machine. It will cross the Yangtze River for 11.325 kilometers and reach Taicang, Jiangsu.
![The first high-speed railway tunnel in Chongming has entered the construction of the main structure, and the open excavation foundation pit at the exit of the Chongtai Yangtze River Tunnel has been excavated to the bottom of the Yangtze River | high-speed railway | tunnel](https://a5qu.com/upload/images/5b871f02251a84682ecbab51162772ba.jpg)