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Tunnel Boring Machine (TBM) - Coggle Diagram
Tunnel Boring Machine (TBM)
Advantage
Fast tunneling speed at sites
Good Natural Ground
Geological Properties
Builds tunnel walls at the same time as excavation
Safe yet speedy construction
Used
Build a headrace tunnel
Shizuoka Prefecture
Component
Cylindrical Excavator
Used to drill through bedrock in a horizontal direction
Geology
Good Natural Ground
Thrust cylinders
Pressed against natural ground to gain reaction force to thrust forward
Poor natural ground
Jacks
Thrust the machine forward
Construction
Behind the TBM workers spray mortar on excavated surfaces
Lining Segment
Steel
Reinforced concrete wall
Assemble a steel wall lining into a ring shape
Safe tunnel construction is possible
Natural ground is kept in a stable condition
Prevent excavated ground from collapsing