Lanhi LDJ400 Multi-Purpose Tunnel Boring Machine Tunnel Excavation Process

   1. Excavate the tunnel floor facing surface;

   2. Excavate the left and right sides of the tunnel bottom;

   3.  Excavate the central main body of the tunnel face layer by layer;

   4. Excavate the tunnel crown and haunch;

   5. Trim the edges of the tunnel vault and haunch;

   Construction Completed!