Chongtai Yangtze River Tunnel
Release time:
2026-01-04
Abstract
Device Number: (“ Leading Ship Shield Tunneling Machine – China Railway Equipment
Cutting disc diameter: 15.4 meters
Tunneling length: 13,200 meters
Project Features:
The “Four World’s Firsts” have set a new global benchmark for high-speed railway tunnels. The tunnel boring machine (TBM) has successfully completed a single-heading tunnel crossing of the Yangtze River, spanning a distance of 11.3255 kilometers—the longest single-heading tunnel excavation in the world. The largest TBM diameter used, the “Linghang,” measures 15.4 meters—making it the world’s largest-diameter high-speed railway TBM. The tunnel’s excavation cross-section reaches 186 square meters, equivalent to the height of a five-story building. The tunnel plunges as deep as 89 meters below the riverbed, enduring an ultra-high water pressure of 1.02 megapascals—roughly equivalent to 10 atmospheres—making it the deepest and highest-pressure underwater tunnel in the Yangtze River basin. This project has also established a world record for high-speed railway tunnels in the 15-meter class, achieving monthly advances of 718 meters, with an average monthly advance of 600 meters. With its “strategic-level value” at its core, this project not only overcame world-class engineering challenges such as ultra-long single-heading tunneling, ultra-high water pressure, and complex geological conditions but also achieved breakthroughs across the board in engineering technology, construction management, and ecological protection.
Year of commencement: December 2022
Year of completion: December 2026
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