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Our products have been widely used in urban subways, railway and highway tunnels, cross-sea and cross-river tunnels, municipal utility tunnels, hydraulic engineering projects, and other fields.
Our customers are located in major cities across China and also export to global markets including the Americas, Europe, Southeast Asia, and the Middle East. We have established strong partnerships with numerous large construction groups and tunnel-boring machine manufacturers.
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 beneath the Yangtze River, spanning a distance of 11.3255 kilometers—the longest single-heading tunnel ever excavated worldwide. The tunnel utilizes the world’s largest-diameter high-speed railway TBM, the “Linghang,” with a maximum cutterhead diameter of 15.4 meters, creating an excavation cross-section of 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 (equivalent to 10 atmospheres). This makes it the deepest and highest-pressure underwater tunnel in the Yangtze River basin. The project has also established a world record for high-speed railway tunnels in the 15-meter class, achieving a monthly advance rate of 718 meters—and averaging 600 meters per month. 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.
Lion Ocean Tunnel of the Guangzhou-Shenzhen-Hong Kong Express Rail Link
This is China’s first underwater railway tunnel constructed using shield tunneling technology. It marks the first time that large-diameter shield tunneling technology has been applied to the construction of a high-speed railway tunnel beneath water. Moreover, the project innovatively adopted a tunneling method known as “tunneling from opposite directions, underground docking, and in-tunnel dismantling,” setting a pioneering industry standard for precise underwater shield tunneling and in-tunnel dismantling. The tunneling operation was carried out beneath the main channel of the Shiziyang Strait, which is 3,300 meters wide and has a maximum water depth of 26.6 meters, facing a high hydrostatic pressure of 0.67 MPa. The geological strata traversed consist primarily of argillaceous siltstone and sandstone, interspersed with weak, "tofu-like" formations, numerous fault zones, and deeply weathered grooves. Additionally, the tunnel passes through sections with exceptionally shallow burial depths—where the tunnel crown is only 7 to 9 meters above the seabed—posing an extremely high risk of collapse. The project successfully overcame several globally challenging issues, including pressurized cutterhead replacement under water conditions. The comprehensive set of technologies developed during this project has been granted multiple patents and will subsequently be widely applied to more than 250 kilometers of composite-strata shield tunnels across China.
This project is the first-ever engineering undertaking in the national pipeline network construction. It features a single-heading tunneling operation using a shield machine over a distance of 10.26 kilometers, with 7,500 meters of underwater tunneling and a maximum ice pressure of 0.73 megapascals. Currently, it represents the longest tunneling distance, deepest burial depth, and highest water pressure among all existing oil and gas pipeline projects that utilize shield tunneling technology to cross rivers worldwide.
