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8/12/2019 Mttbm Seli
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MAIN PROJECT DATA
- 17.064 m long hydraulic tunnel
- 1 double shield TBM having a boring
diameter of 4,88 m
- 4,2 m internal section
- Excavation will be associated with hexagonal precast segments lining
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LINING OF HEXAGONAL PRECAST SEGMENTS
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The method with double shield + hexagonal segments
has been adopted by SELI in many other completed projects, namely:
The Yindaruquin irrigation project China (18 km)
The Evinos aqueduct project Greece (30 km)The Guadiaro aqueduct project Spain (12 km)
The Whanjazhai Yellow River Diversion Project China (90 km)
The Esperanza-Poza Honda project Ecuador (23 km)The Mohale project Lesotho (30 km)
The Pieve Vergonte water power project Italy (9 km)
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It is now applied in the following projects under
construction:
The La Joya water projectCostarica (9 km)
The Dez-Ghomrud water tunnel projectIran (18 km)
The MonteGiglio ground
conveyance project Italy
(9 km)
The Kerman LongTerm water supply
project Iran (65 km)
The Gigel Gibe - Omohydroelectric power project
Ethiopia (28 km)
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THE TUNNELING SYSTEMGENERAL DESCRIPTION
The System is composed of:
A double shield TBM having a boringdiameter of 4,88 m
A back up system for this TBM The rolling stock to muck out, to transport
material and personnel
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The system is able to execute the tunnel in a single pass operation, including the following works:
- Excavation of tunnel
- Erection of precast lining- Backfill grouting of annular space between the
excavation and the precast lining
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The principal improvements of proposed doubleshield are:
the cutterhead design
the exploration drilling rock consolidation measures
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PRELIMINARY TUNNEL TYPICAL SECTION
- Boring diameter: 4,88 m
- Outer dia. of the segmental lining: 4,70 m
- Inner dia. of the segmental lining: 4,20 m
- Segmental lining tickness: 25 cm
- Longitudinal lenght: 1,30 m
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TBM DS Excavation cycle of double shield
STEP 1:STARTING
STEP 2:
TUNNEL EXCAVATION AND INSTALLATION OF
SEGMENT
STEP 3:
ADVANCING THEGRIPPER SHIELD
(REGRIPPING)
STEP 4:
BACK UP ADVANCE
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Back - up
The main targets at the base of its design development have been: shortest possible length of the back-up without compromise on
capacity, efficiency and completeness
reduced time for back-up assembly and connection to the TBM
physical separation, inside the tunnel section, of the back-upequipment & working area from the rail track transport line
provide all along the tunnel a safe walkway and working space onthe side of the transport train
reduced overall weight and dimensions of the back up decks for more economic packing and transport
to be fully in respect with safety standards and CE certified
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The back up main components are:
hydraulic power units
main power transformers
ZED system
operator control cabin
electric switchboard
Variable speedfrequency converters
TBM auxiliary equipment General Services
fresh air ventilationand air distributionsystem
train pusher segments unloadingand trasport system
pea gravel system
grouting system
gas monitoring
air scrubbing system
compressor
emergency gen set
MV cable and reels
lighting system
close circuit TVcamera system
muck conveyors
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Rolling stock
Conveyor
Equipment
Walkway foroperators
SECTION
PLAN VIEW
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Rolling Stock
Each tunnel train includes:
10 muck cars with acapacity of 10 m 3 each
1 pea gravel car
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4 flatbed cars for the transport of precast segments
1 personnel car
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MAIN AUXILIARY EQUIPMENT AND SYSTEM
Ventilation system and dust control Gas detection and alarm system Tunnel ground water pumping system
Electric power supply Industrial water line Compressed air system
Lighting system Telephone system
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VENTILATION SCHEME ON TBM AND
BACK UP AREA
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MONITORING OF THE TBM PARAMETERS AND
TUNNEL INSTRUMENTATIONSA data-taker registers on electronic support thefollowing parameters:
- Total thrust- Total power - Working torque- ZED readings- Cutterhead RPM- Penetration rate- Stroke
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MONITORING OF THE TBM PARAMETERSAND TUNNEL INSTRUMENTATIONS
Moreover it could be recorded:
- Duration of each 65 cm stroke- Altitude and position of the TBM relative to the tunnel
axis- Pressure distribution in the thrust cylinders- Cause and duration of any advance stoppage
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PRELIMINARY ORGANIZATION OF
TUNNELLING ACTIVITIES
maintenance + eventual probe drilling
boring shift 1
boring shift 2
10 h 10 h4 h
per 6 days/week
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TBM to advance in unstable ground: cavity filling
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TBM to advance in unstable ground: front consolidation
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