Northern Heavy Industries tunnel boring machine break through. 1119 metres. "Without affecting over ground, Northern Heavy Industry TBM started tunnel excavation in March 2021 from Quanyun Road Station of Metro Line 2 and solved hundreds of large and small problems, and completed it in one go. The task of double-line underground penetration by Gaoquan section." On the scene, say Xu Chengfa, deputy general manager of the Northern Heavy Industry Tunnel Engineering Technology Company, informs Peoples Daily. 

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