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Product/Equipment Innovation of the Year

Hard Rock Shield + Earth Pressure + Slurry three-mode TBM

three-mode-tbm
The section of Luogang station - Shuixi station of Phase 2, Line 7, Guangzhou Rail Transit is 1086.5m long in total, with 19,73m buried depth, 600m minimum radius of curve, and 28‰ maximum gradient, with tunnel's outer diameter of 6m, and inner diameter of 5.4m.
The engineering geology in the section is complex and variable. The TBM mainly tunnels through granite residual soil, boulder, upper-soft and lower-hard rocks, and full-section hard rocks, with high strength of rock stratum (up to 140Mpa), and relatively developed boulder (66.7%). During the construction, the shield continuously tunnels through important buildings and structures such as the airport high-pressure oil pipeline, tram line 1, and existing operating subway tunnels.
The use of dual-mode TBM or mining methods can easily cause settlement of earth's surface, building and structure, incapable of effectively controlling the overall risk during construction. The researched and developed Hard Rock Shield + slurry + earth pressure three-mode TBM can effectively reduce risk, and control settlement of earth's surface and surrounding structure during tunnelling.