en.Wedoany.com Reported - On May 29, a super-large diameter shield machine with an excavation diameter of 14.57 meters, named "Jiaoping No.1," rolled off the production line in Changsha, Hunan. It will be used for the excavation of the Mangshan Tunnel on the Jiaoping Railway, the world's largest diameter earth pressure balance shield tunnel for high-speed rail.

The equipment was jointly developed by China Railway 11th Bureau Group and China Railway Construction Heavy Industry Group. The entire machine has a total length of approximately 110 meters, a total weight of about 3,500 tons, and an installed power of 10,000 kilowatts. It integrates processes such as cutting, mucking, lining, and grouting, enabling integrated continuous operation.

The Jiaoping Railway is a key component of the Hohhot-Nanning Corridor within China's "Eight Vertical and Eight Horizontal" high-speed railway network. The entire line is approximately 230 kilometers long, with a design speed of 350 kilometers per hour. As a controlling project of the entire line, the shield section of the Mangshan Tunnel on the Jiaoping Railway is 4,970 meters long, with a tunnel excavation diameter of 14.57 meters, adopting a single-tube double-track design.

To address complex construction conditions, the shield machine is equipped with China's first super-large diameter shield cutterhead suitable for soft-hard composite cemented strata, a multi-level composite grouting system, and integrates air pressure-assisted excavation with a shield AI intelligent management platform, driving the upgrade of shield construction towards intelligentization.

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