Single Shield TBM
Suitable for tunnelling in soft rock with low compressive strength. Typically, for middle to long distance tunnel works in soft rock or fractured rock with certain self-stability. Furthermore, tunnelling and lining can be proceeded at the same time.
Tunnel No.7 of Taohe River Water Diversion and Supply Project, China
A single shield TBM with boring diameter 5.75m was deployed in this project, But its driving progress was extremely slow in fractured zones encountered therein due to water ingress and sand inflow. At the beginning of 2011, as per client's request for remanufacturing, CREG refurbished the machine with modified design in which a bi-directional cutting and mucking system was introduced (this technology is applied for the first time in the world). Resultantly, the rolling problem occurred during tunnelling was effectively resolved. The remanufactured TBM accomplished monthly progress of over 1500m in three consecutive months. Furthermore, it set up a new world record in November 2011 for advancing 1868m just within one month.