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Unformatted text preview: Tunnel Boring Machine
Tunnel Boring Machine Tunnel Boring Machine
Tunnel 200 tons to almost 1,000 tons Length of 4 football fields Cutting head up to 15 meters in diameter Tunnel Boring Machine
Tunnel Cuts through mountains Send trains under cities Move millions of gallons of water without using explosives History
History Invented in 1970’s
– Mining was more dangerous
Mining was done using blasthole drilling More hazardous Took longer Holes would be drilled into the face of rock Dynamite placed into the holes Dnamite would be set off Cutting Head
11 meters up to the largest in the world which is 15 meters The cutting head contains up to 58 roller cutters made out of hardened steel. They are placed at right angles and cause rock to splinter into small bits.the bits fall and are shoveled up by the cutter head onto the conveyor belt and transport the rock out of the tunnel. Hydraulic Press and Legs
Hydraulic The hydraulic press is the gripping mechanism
Hydraulics press head forward with 28 tons of pressure As grippers move forward, so do the legs Legs help with stability – Legs two and four move then one and three. As you move 60 meters down the machine As you move 60 meters down the machine there are anchor drills drilling holes in the rock wall. Behind the anchor drill mesh is pressed in placed ready for the next step. The tunnel boring machine also has a The tunnel boring machine also has a machine which lines the walls where mesh have been place with concrete. Concrete is sprayed 360°. Conclusion
Conclusion The tunnel boring machine is an accentual part of tunnel operations. It cuts down on construction time and adds safety. The TBM can do 4 jobs with one machine. Once it’s finished all the rest of the major components are ready to be installed. ...
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- Spring '08