Horseshoe Shape TBM
Dissimilar to a circular TBM, a Horseshoe Shape TBM face is designed in horse shoe shape. It is mainly applied to bore soft ground tunnels of large road and railway projects in mountain areas.
Kuala Baicheng Tunnel of Mengxi-Huazhong Coal Transportation Railway (The West Inner Mongolia-Central China Railway)
The construction method using such Horseshoe Shape TBM is for the first time used to bore tunnels of roads and railways in mountain area. It is environment friendly, safe, economical and efficient. A Horseshoe Shape TBM can maximally increase space utilization. Compared to a circular face, the area a Horseshoe Shape TBM cuts can be reduced by 20% to 30%. The U-shape tunnel face exceeds 11m in this project and is excavated with earth pressure balance mode.