PowerPoint PresentationLevent Levent Ozdemir
Design Pressure
Face pressure controlled by compressed air bubble
Face pressure controlled by slurry pumping rates.
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Grain diameter d (mm)
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JAW CRUSHER CAPACITY
CUTTING TOOL CHANGES
Access down into cutting arm spoke
Operator undertakes maintenance procedure's without the risk of having to work in the tunnel face
Back loading cutting tools
System for large diameter Mixshields with accessible cutter head structure
First use in 1996 (Elbetunnel)
Full face disc cutters 17” or 19”
Full face for disc cutters and soft ground tools
Individual tool condition and wear sensors
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ATMOSPHERIC TOOL CHANGE at 12-bar PRESSURE (Istanbul Strait Crossing Tunnel)
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Reasons for Chamber Interventions.
Inspection of face conditions and mechanical equipment in the excavation chamber
Maintenance / replacement of cutting tools and wear protection elements
Maintenance or cleaning of other chamber installation
Removal of natural or man made obstacles
Repair of structural damage
Chamber Access, Types Of Interventions In Tunneling
Compressed air 0-3,6 bar, up to 4,5bar in exceptional cases, short duration
decompression in TBM airlock
state of the art,
Mixed gas for short duration up to 6,0 bar
decompression in TBM airlock
above ground hyperbaric habitat (crew transfer shuttle)
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TYPES OF INTERVENTIONS
2,5
SYDNEY Mixshield, Ø 10,4m
MÜLHEIM Mixshield, Ø 6,9m
GRAUHOLZ Mixshield, Ø 11,6m
WESTERSCHELDE Mixshield, Ø 11,4m
HALLANDSAS Mixshield, Ø 10,53m
ISTANBUL Mixshield, Ø 13,71m
Diagramm1
Year
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2.5 3.5 3.5 4 5.5 7.5 11 14 11
Face Pressure [bar]
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CONVERTIBLE MACHINES
Open Mode - Submerged wall gate closed - Center belt and muck hopper in forward position - Closing / Mode change within 2 - 4 hours
Closed Mode – Slurry machine - Submerged wall gate open - Center belt and muck hopper retracted and sealed - Slurry circuit and treatment plant in operation
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Hybrid rock/slurry machine Open/Closed mode operation Designed for 17 bar pressure Excavation diameter 23.5ft Hyperbaric intervention at high pressure
LAKE MEAD HYBRID TBM (ROCK/SLURRY MACHINE)
Slurry and EPB specific modules or subassemblies permanently installed
Change of operation mode in the tunnel
Chamber interventions for “activation” of mode specific equipment required 23
CHANGE BETWEEN SLURRY SHIELD AND EPB (Integrated concept)
Long tunnel (10km)
Long single stretches within the alignment with clear preference for operation mode
TBM size of 10m sufficient to install parallel systems 24
CHANGE BETWEEN SLURRY SHIELD AND EPB (SOCATOP tunnel , France)
EPB Mode: Machine uses a screw conveyor to maintain face pressure and to remove muck
Slurry Mode: In slurry mode, muck empties into a enclosed slurry box where boulders are broken up using a crushing mechanism in the box and then fed into the slurry pipes.
ROBBINS CROSSOVER SLURRY/EPB TBM
ROBBINS CROSSOVER TBMs
Transformation between EPB face support and slurry face support in the tunnel without the need of modification or chamber intervention
Full size and quality face support systems for EPB and slurry operation
Safe and fully controlled conditions for face support during mode change
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HERRENKNECHT “VARIABLE DENSITY” CONCEPT (CHANGE BETWEEN SLURRY AND EPB MACHINE)
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Diameter [m]
To rq
ue [k
N m
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Types of Interventions
TYPES OF INTERVENTIONS
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