Xcmg Tunnel Boring Machine Assists The World’s Most Difficult Railway Structure
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Dali-Ruili Railway is hailed as the “World’s Most Difficult Railway” since it passes through rivers and mountains, including the Nujiang River, Lancang River, Nu Mountain and Cang Mountain. XCMG’s XTR6/260 has recently been used in the Dazhushan tunnel to further progress the linking within the Dali Ruili Railway. The Dazhushan Tunnel is currently under construction and lasts for 17,623m. Since its commencement in 2008, the project has encountered many over a hundred tunnel face slips, sixty cracks and deformations, rock burst, and other harmful geological problems. This shows the complex geological conditions difficulty to construct the large-scale tunnel project. The tunnel project is a key link in Dabao Section of Dali-Ruili Railway.
A total of three XCMG XTR6/260 cantilever tunnel boring machines have officially operated in Xiuling Tunnel of Dali-Ruili Railway. In the course of digging Xiuling Tunnel, XCMG cantilever tunnel boring machine is thirty percent more efficient than borehole-blasting method which would otherwise cause collapse, water-mud bursting and other conditions that may seriously delay the construction progress. In the process of formal construction, XCMG XTR6/260 tunnel boring machine digs no less than 5m each day without any down time. XCMG boring machine integrates the traditional blasting, ventilating and slag tapping processes to continuously excavate the surrounding rock and transport the sludge out. In result, this greatly lowers the agitation of the surrounding rock and effectively preventing the tunnel from collapse.
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