First large-diameter open TBM in China "Yuecheng Liangshan" start boring Daliangshan No. 1 tunnel on the Leshan-Xichang highway in Sichuan Province on October 13.

The Lexi high-speed TBM equipment (DG785) has excavation diameter of 7.93m. Total length of 176m. Total weight of 1,400 tons. Total power of 5200Kw.

The Sichuan Highway Design Institute cooperate with TBM equipment manufacturers to combin engineering characteristics and geological conditions. Result targeted improvements to the cutter head, main drive, shield, and initial support system, and completed the first domestic large-diameter open type TBM. . Brainstorming, with major domestic and foreign TBM equipment manufacturers and technical experts from universities and enterprises such as Southwest Jiaotong University, China Railway First Institute, China Railway Second Institute, China Tunnel Co., Ltd. performed.

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