On May 8, 2022, the off-line ceremony of the first large-diameter TBM "Shutong", the first large-diameter TBM built by CREG in China, was held in Deyang, Sichuan. Construction of Bauhinia Tunnel for Mountain Rail Transit Project.

The Bauhinia Tunnel of the Dusi Mountain Rail Transit Project undertaken by the China Railway No. 5 Bureau belongs to the eroded structural topography of the transition between the Qinghai-Tibet Plateau and the Sichuan Basin. The dentate alpine landform has a total length of 10.4 kilometers. One of control engineering. The interval of TBM is about 5.1km, and it will pass through several faults, large deformation of soft rock and rockburst areas, which will bring great challenges to the construction and installation of TBM. The excavation diameter of "Shutong" is 10.23 meters, the total length is about 222 meters, and the total weight is about 2500t. Four bolting rigs, emergency mixed injection system, steel arch assembling system and advanced drilling rig system are equipped with support systems, which will escort the safe and efficient construction of the tunnel.Editor/Ma Xue