Garret O'Connor, Transurban: Hills Motorway M2 upgrade Norfolk Tunnel widening
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Garret O’Connor, Project Director, Transurban 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/tunnellingconference
Transcript of Garret O'Connor, Transurban: Hills Motorway M2 upgrade Norfolk Tunnel widening
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SYDNEY NETWORK
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PROJECT SCOPE
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• Reduce congestion
• New entry/exit points - Windsor Road - Macquarie Park
• Upgraded ITS
• Tunnel widening and systems upgrade
• Cashless tolling
HILLS M2 UPGRADE
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ORIGINAL TUNNEL
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ORIGINAL TUNNEL Cross Section
ORIGINAL CONDITON
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TUNNEL REQUIREMENTS
Three 3.5m lanes eastbound and westbound
2.5m breakdown lane
0.5m median shoulder and 0.6m protected walkway
New fire safety deluge system and storage tanks
New HV sub station
New Intelligent Transport System
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CHALLENGES
• Working next to live traffic. • Non continuous work times
(weekends only). • Requirements to return to an
operational motorway at the end of every shift.
• Maintaining the operational capability of the tunnel for motorway operation requirements during construction.
• Close proximity to the community. • Managing environmental
constraints. • Staging and sequencing.
Widening of an existing tunnel while maintaining traffic flow at all times is a first for Australia
AUSTRALIAN FIRST
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TUNNEL WORK PROGRAMME
Service Relocation
Trench and Niche Excavation
Batter Widening
Tunnel Widening
Drainage and Pavement
Finishings
Project Time Chainage
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NEW SERVICE TRENCH
Multiple detail excavation methods used
NEW NICHES
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M&E STAGE 1
EXCAVATION CUT IN EASTBOUND
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EXCAVATION CUT IN WESTBOUND
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CONSTRUCTION VENTILATION 2no. 30m³/sec Low Profile Dust Scrubber
ROCKBOLTING, GROUT & SHOTCRETE
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Type 1 – 2 m grid Type 2 – 1.5 m grid
ROCKBOLTING, GROUT & SHOTCRETE
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Grid Layout and Staging
ROCKBOLTING, GROUT & SHOTCRETE
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24 mm DCP from DSI in 45 mm hole 100 mm SFR Shotcrete
SS cap and grout for 100 year design life
60,000 t rock removed 6,000 No 5m rock bolts installed 6070 m2 of shotcrete applied 4,200 m2 of pavement placed
TUNNEL WIDENING- CIVIL
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Westbound Eastbound
PORTALS
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• Deluge with 15 zones per tube. Mains supply only.
• Fire wire for detection. • Six pairs of jet fans per tube. • Three cross passages at 120m
spacing • Egress signage • Lane Usage and Tunnel
Message Signs • Counter-beam lighting
FIRE AND LIFE SAFETY ORIGINAL
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• Redundant water supply using twin 350,000 l tanks. • Automatic Video Incident Detection. • Ventilation fire mode controlled by wind speed and
pressurisation in non-incident tunnel • Lowered floor of cross passages • Running man signage • Radio Rebroadcast • Symmetrical lighting • Tunnel Closure System with VSLS, VMS, Boomgates and
Traffic Signals
FIRE AND LIFE SAFETY UPGRADE
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FIRE AND LIFE SAFETY UPGRADE
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• 1,000+ new lights
• 24.5 km of sub-main cabling
• 7.5 km of new deluge pipework
• 4 x diesel fire booster pumps
• Over 6500 small rock anchors to
support suspended installations
• 8 x new Electric niches
• New 11KV HV power supply
TUNNEL WIDENING- M&E
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CROSS PASSAGES
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TRAFFIC MANAGEMENT
NOVEMBER 2011 – AUGUST 2012
2 x Eastbound and 1 x Westbound 26 weekends from November 2011
Saturday 20:00 to Monday 5:00 (33 hours)
Eastbound excavation : 2 + 1 Contraflow in Westbound Tube
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TRAFFIC MANAGEMENT
AUGUST 2012 – APRIL 2013
2 x Eastbound and 2 x Westbound between 8pm – 2pm the next day and throughout weekends
3 x Westbound between 2 - 8pm Mon to Fri (2 lanes in Eastbound Tunnel and 1 lane in
Westbound Tunnel)
Westbound excavation : 2 + 2 Contraflow in Eastbound Tube
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WIDENED TUNNEL
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