Which company is the construction party of He Lan high-speed rail Qu 'ao tunnel?

China Railway 18th Bureau. 202165438+February, the Lanzhou-Xinjiang Railway, a major cultural exchange channel between China and Tibet, was built by China Railway 18th Bureau Group, and the He Lan Railway was built by China Railway 18th Bureau Group. China Railway 18th Bureau Group Co., Ltd., as the core enterprise of China Railway Construction, one of the world's top 500 enterprises, was formerly the Eighth Division of Railway Corps and was established in 1958+00.