Open-type TBM is mainly used in rock environment with completed stable surrounding rock. When the partial surrounding rock is not stable, TBM can make lining support with its own auxiliary equipment such as steel arch assembling device, jumbolter and grouting, keeping the tunnel wall stable.
When the TBM confronts with partial soft rock or fracture zone, it may need advance reinforcement with TBM’s accessory equipment such as probe drill and concrete grouting equipment, the TBM can continue to proceed after the surrounding rock become self-stable. The property variation of surrounding rock can be directly observed during tunneling, it is good to describe the geologic drawing.
|total length||m||Approx. 190|
|Min. curve radius||m||500|
|adaptive Max. slope||(up slope)2°、(down slope)2°|
|cutter head weight||t||Approx.160t|
|excavation diameter||mm||7930 mm|
|Max. expanding excavation||mm||single lateral 50mm|