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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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