en.Wedoany.com Reported - Recently, the "Yuneng Gaoshan" mine full-face hard rock Tunnel Boring Machine (TBM), developed by Jiangsu Shendun Engineering Machinery Co., Ltd., successfully completed a 180° U-shaped turn excavation in the 1915 middle bottom drainage roadway of Gaoshan Coal Mine, owned by Guizhou Yuneng Investment Co., Ltd. This marks the first time a mine TBM has performed a large-angle reverse excavation in a confined underground space in the Guizhou mining area. The U-turn roadway for this project is approximately 293 meters in total length. Excluding 5 days of equipment maintenance, the actual construction took 30 days, with an average daily excavation rate of about 9.8 meters, approaching the efficiency of straight roadway excavation and filling a technical gap in large-angle reverse excavation for mine TBMs in Guizhou Province.
This construction took place in the 1915 middle bottom drainage roadway of Gaoshan Coal Mine. The "Yuneng Gaoshan" TBM has an excavation diameter of 5.03 meters, a total machine length of 95 meters, a total weight of 350 tons, and an installed capacity of 1593.5 kW. It can adapt to slope environments ranging from -18 degrees to +20 degrees, with a horizontal turning radius of 80 meters. This equipment is the first mine TBM introduced by Guizhou Yuneng Investment Co., Ltd., and began excavation in the 1915 middle bottom drainage roadway on December 16, 2025, primarily for the rapid construction of mine gas control roadways. Coal mine bottom drainage roadways are critical tunnels for gas extraction. By excavating roadways at the bottom of the coal seam in advance and arranging extraction boreholes, the gas content in the coal seam can be effectively reduced, ensuring the safety of subsequent mining operations. Under complex geological conditions, roadway construction must follow the coal seam strike. U-shaped turns maximize coverage of the extraction area, but completing a 180° turn with a TBM in a confined space imposes extremely high demands on the equipment's turning capability and attitude control.
Jiangsu Shendun Engineering Machinery Co., Ltd. provided the equipment and technical support for this project. Founded in 2016 and headquartered in Suqian City, Jiangsu Province, the company specializes in the R&D and manufacturing of rapid excavation equipment for mine roadways. Its main product is the mine full-face tunnel boring machine (TBM), widely used in coal mines, non-coal mines, and other fields. The company has established the Jiangsu Provincial Mine TBM Engineering Research Center, and its "Key Technologies and Equipment for Rapid TBM Excavation in Coal Mine Rock Roadways" scientific achievement has been recognized as internationally advanced by the China Coal Industry Association. According to publicly available company information, Jiangsu Shendun has completed nearly 50 ultra-small turning construction tasks in approximately 30 mines nationwide, with a cumulative turning construction mileage exceeding 10 kilometers. Among these, 21 projects achieved 180° "U"-shaped turning excavation. The company possesses the capability for customized manufacturing of small turning radius equipment, having achieved conventional turning radii of 20 to 30 meters and pioneered an extremely small turning radius mine TBM of 15 meters.
The successful completion of the 180° U-shaped turn by the "Yuneng Gaoshan" further validates the adaptability and continuous construction capability of mine TBMs in complex underground roadways. It provides a replicable technical solution for the construction of bottom drainage roadways and gas control roadways in high-gas mines in Guizhou and the broader Southwest China region. Moving forward, Jiangsu Shendun will continue to advance technical breakthroughs in equipment with even smaller turning radii, optimize excavation plans, and contribute to the efficient and low-cost construction of mine roadways.
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