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THE PROPERTIES OF TBM’S
TBM’S ADVENTAGES
TBM’S DISADVENTAGES
TYPE OF TBM’S
◦ Hard Rock Machines
◦ Soft Ground Machines
◦ Dual Mode Machines
BACK-UP SYSTEMS
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The largest tunneling machines
No high deformation
Continuous miner
Work fastly
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Limiting the disturbance to the surrounding grounds
Producing a smooth tunnel wall
Faster than blasting pattern
Continuously working conditions
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Upfront cost
Difficult to transport
Expensive to construct
Less capability changing the route
No return
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DIAMETER 14,2 m , WEIGHT 380 t 8
Hard Rock Machines
Soft Ground Machines
Dual Mode Machines
TYPE OF TBM’S
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Single Shield TBM
Double Shield TBM
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Aproximately %80 digging operating time
The remaining %20 corresponding to segment fitting
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1) a cylindrical tapered steel structure 4) cutter head 2) hydraulic thrust cylinders 5) muck bucket lip 3) segment ring 6) conveyors
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Machine operation has 3-step processes
Digging by the cutter head,
Laying of the lining,
To put rear shield to the next digging position and back-up traction
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1) extendable front shield 2) cutter head 3) gripper 4) auxiliary thrust cylinders 5) lining segments
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DOUBLE SHIELD TBM
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EPB shield
Slurry shield
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Working conditions
Less than 4 bar pressure
Unstable grounds such as clay, silt
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1) cutter head 2) excavation chamber 3) pressure bulkhead 4) thrust cylinders 5) auger conveyor 6) erectors 7) lining segments
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Working parameter
Sand, gravel geological conditions
Compressed air supply and compressed air export
Slurry tbm can be effectively used as a slurry shield without compressed air support.
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1) dive wall 2) pressure bulkhead 3) extraction chamber 4) pressure chamber 5) communicating pipe 6) slurry conduit 7) conveyor conduit 8) supply conduit 9) supply conduit 10) air regulating equipment 11) air pressure cushion 12) suction rack
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The machine is used as a mixshield where gravelly geological conditions indicate an unstable tunnel face or mixed geological conditions.
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1) cutter head 2) bentonite suspension 3) excavation chamber 4) the feed line of the bentonite suspension 5) compressible air cushion (Air chambers) 6) dive wall 7) lining segments 8) lining segments erektor
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MIXSHIELD
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Eskişehir – Kösedağ Speed Train Project
d:13.7 m 26
DO YOU HAVE ANY QUESTION ?
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