christian d'hondt, thiess: west to east: continuous improvement from city west to city east...
DESCRIPTION
Christian D’Hondt, Project Manager, Tunnelling, CECT project, Thiess delivered this presentation at the 2013 Australian Tunnelling conference. The two day conference is supported by the Australasian Tunnelling Society and brings together tunnelling leaders, engineers and industry experts to share best practice in tunnelling design, construction, safety and maintenance. The 2012 program focussed on updates from Australasia’s current and future projects, plus case studies from leading International projects - sharing best practice and lessons learnt from the forefront of the latest tunnelling projects. For more information about the event, please visit the conference website: http://www.informa.com.au/tunnellingconferenceTRANSCRIPT
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CITY EAST CABLE TUNNEL
WEST TO EAST CONTINUOUS IMPROVEMENT FROM
CITY WEST TO CITY EAST CABLE TUNNEL
The 12th Australian Tunnelling Conference 21st November, 2013
Christian D’Hondt (Thiess) | Tim Burns (Thiess)
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• Early contractor involvement (ECI)
• Flexural strength assessment of SFRC segments
• Backfill of segment lining annulus
• Cast in-situ lining
• Separation of plant and pedestrians
• TBM specification
CONTINUOUS IMPROVEMENT
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AUSGRID’S SYDNEY CITYGRID PROJECT
CITY WEST CABLE TUNNEL
• 2007 – 2010 Completed & operational
CITY EAST CABLE TUNNEL
• 2011-2015 Under construction
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• Constructability advice to client and designer
• Imputing into value engineering workshops
• Generating construction programs
• Advice and input into the environmental assessment
• Providing cost estimates at various stages of the development of the design.
EARLY CONTRACTOR INVOLVEMENT
(ECI)
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• CWCT project, flexural beams (ASTM C1609)
• Co-efficient of variation for residual flexural strength 29.4%.
• CECT project, supersized round panels (ASTM c1550)
• Co-efficient of variation of super-size round panel residual flexural strength 10.9%
CONTINUOUS IMPROVEMENT
FLEXURAL STRENGTH ASSESSMENT OF SFRC
SEGMENTS
Residual Flexural Strength Spread at CWCT
Residual Flexural Strength Spread at CECT
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• Open mode hard rock TBM
• A two component A / B annulus grout
• Injected through tail-shield grouting ports directly into the annulus.
• Inject the B component into the a component stream inside the tail-shield as opposed to in the annulus
CONTINUOUS IMPROVEMENT
BACKFILLING OF SEGMENT LINING
ANNULUS
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• Horizontal crown with curved chamfers
• Bespoke steel shutter was made to form the curved obvert
• Wall pours separate to crown pours
• Heavy steel shutter in tight workspace
• Average productivity of 0.55m/day
CONTINUOUS IMPROVEMENT
CAST IN-SITU LINING
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• Horizontal crown with two 45 degree chamfers
• Standard formwork components
• Allowed integrated wall and crown pour
• Lighter more manageable components
• Average productivity of 1.47m/day (167% IMPROVEMENT)
CONTINUOUS IMPROVEMENT
CAST IN-SITU LINING
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Key control - physically separate plant movement from pedestrian movements
• 1000 semi trailers
• 5000 truck & dogs
Constrained CBD site
Pedestrian bridge and elevated walkway
Spoil loading inside acoustic shed to separate from public
CONTINUOUS IMPROVEMENT
SEPARATION OF PLANT AND PEDESTRIANS
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• Offset TBM backup
• Reduced need for persons to enter the rail envelope
• Access, control and maintenance of all devices from walkway
• Beneficial for shaft launch
• Integral with TBM design
CONTINUOUS IMPROVEMENT
SEPARATION OF PLANT AND PEDESTRIANS
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Cutter head
• Mono directional
• Openings 15%
• 17” cutters
• Inclined loading plates
Erector
• 6 degrees of functionality
• Vacuum erector
Dewater
• Hydraulically removable dewater tank
CONTINUOUS IMPROVEMENT
TBM SPECIFICATION
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WEST TO EAST
Continuous improvement from city west to city east cable tunnel
Acknowledgements:
• Ausgrid
• Structural concrete industries (SCI)
• SMEC
• Caterpillar tunnelling Canada
• Tachibana material co.
CONTINUOUS IMPROVEMENT