Main Beam Tunnel Boring Machine

A Robbins Main Beam Tunnel Boring Machine is complex in its design, yet relatively simple in concept. The front of the Main Beam Tunnel Boring Machine is a rotating cutterhead that matches the diameter of the tunnel. The cutterhead holds disc cutters (ranging from 11a to 20a in diameter) which are positioned for optimal boring of the given rock type. As the cutterhead turns, hydraulic propel cylinders push the cutters into the rock. The transfer of this high thrust through the rolling disc cutters creates fractures in the rock causing chips to break away from the tunnel face.

Unique Features of our Main Beam Tunnel Boring Machine :-
# Cutter head matched to the geologic conditions to ensure smooth, efficient boring
# Large-diameter high-load capacity disc cutters to penetrate the rock efficiently
# A large-diameter main bearing and bull gear assembly specially designed for high-thrust applications in underground conditions
# Robbinsa unique floating gripper system for continuous steering capability
# Hydraulically actuated side and roof supports to stabilize the cutter head by minimizing cutter wear
# Laser target steering for tunnel accuracy
# Steel dust shield to maintain a seal between the tunnel and the cutter head, trapping dust in the cutter head for removal by scrubber through the main beam
# Efficient belt conveyor inside the main beam transfers muck from the cutter head to the rear of the TBM