On April 26, 2022, the No. 4 inclined shaft of the Chongqing Changjiang Tunnel of the Chongqing-Xiangjiang High-speed Railway, which was built by the China Railway 14th Bureau, was officially opened for construction, marking the country's longest underwater high-speed railway tunnel has entered the full construction stage.

The Chongqing Yangtze River Tunnel Project is located in Yuzhong District and Nan'an District of Chongqing City, with a total length of 11.9 kilometers, a maximum buried depth of 330 meters, and a single-hole double-track tunnel with a speed of 120 kilometers per hour. The tunnel starts from Chongqing Caiyuanba Railway Station and ends near Huatianzui Village, Chayuan New District. The tunnel as a whole highlights the complex characteristics of crossing the city, crossing the river and crossing the mountain. It is the longest underwater high-speed rail tunnel in the country and is known as the longest Yangtze River. tunnel. Among them, the No. 4 inclined shaft has a total length of 957 meters. The construction will pass through the Nanshan Scenic Area and enter the two ends of the main hole. It will undertake the construction task of 2,900 meters in the main hole.

The Chongqing Yangtze River Tunnel is a control project of the Chongqing-Qianjiang section of the Chongqing-Xiang High-speed Railway. After completion, it will fill the gap of Chongqing's cross-river tunnel. The successful construction of the No. 4 inclined shaft into the tunnel will open up a new working surface for the construction of the main tunnel of the Chongqing Yangtze River Tunnel, which will greatly relieve the pressure on the construction period of the Chongqing Yangtze River Tunnel. In the follow-up tunnel construction, the project department will strictly follow the tunnel construction principles, ensure safety, focus on quality, and rush progress, and fully implement the construction of standardized demonstration projects to provide important node guarantees for the Chongqing Yangtze River Tunnel to be completed on schedule. (Please indicate Seetao.com www.seetao.com for reprint) Seetao.com Engineering Column Editor/Wang Xia