taking the dart underground dublin’s interconnector tunnel underground.pdf · presentation...
TRANSCRIPT
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Taking the DART UndergroundDublin’s Interconnector Tunnel
A Presentation to
Dublin City Council
By
Iarnród Éireann
7th July 2008
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Presentation Content
Taking the DART UndergroundDublin’s Interconnector Tunnel
• Existing Network
• Capacity requirements, constraints and solutions
• The Interconnector Project
• Construction issues
• Project Appraisal
• Questions
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Existing Network
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Existing Network
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Capacity requirements, constraints and solutions
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2004 Demand Forecasts for Interconnector Route
DocklandsPearseSt Stephen’s GreenChristchurchHeuston
A.M. Peak Hour Boarding & Alighting Figures
Prelim Design based on 2004 DTO figures, the Interconnector Study carried out by Parsons Brinckerhoff and RPA modelling
Reference design to incorporate up-to-date DTO modelling
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Dublin Commuter Belt Capacity Requirements (DTO)
(Passengers per peak hour)
2020 Estimate
Northern Line 22,000
South East Line 14,000
Kildare Line 12,000
Maynooth Line 14,000
Total Peak 62,000
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Terminal Station at Heuston
Northern Line Bottleneck at Connolly
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Interconnector – Integral to the Holistic Solution
> Creates an East – West Link,> Maintains the North – South Service > Affords Additional Access
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Greater Dublin Rail Network
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Interconnector Project Objectives
High Capacity – In excess of 28,000 Passengers per hour in both directions
Frequent – In excess of 20 trains per hr.
Fast – Less than 10 minutes from Heuston to Docklands
Reliable
Accessible
Integrated – Interchange with LUAS, Metro North, Intercity & Commuter Services
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Interconnector Project Overview of Current Strategy
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PHASE 1 (Feasibility)
To identify the route selection
Completed in 2004
PHASE 2 (Preliminary Design)
To validate the Route, Outline Station Design and Preliminary SI
Completed in 2008
PHASE 3 (Reference Design)
Reference Design, Railway Order, PPP Tender Process
Completion Date Mid 2011
PHASE 4
Construction PhaseCompletion Date End of 2015
Phases
Comple
ted
Comple
ted
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Output from Phase 2Preliminary Design
• Preferred Route Alignment
• Identification of station locations
• Cost estimates
• Preliminary project risk assessment
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• Develop and optimise design to Reference Design Level
• Submit an application for a Railway Order
• Tender process (3 stage)
• Develop the Cost Plan
• PPP Procurement Process (Financial, Legal)
• Finalise the PPP contract
Output from Phase 3Planning / Procurement Stage
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Interconnector Recommended Route
Heuston
Christchurch
St. Stephen’s Green
Pearse
Docklands
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Interconnector – Data Summary
• 5.2 km of twin bore tunnel
• 14.4 km of electrified heavy rail track
• 5 Underground Stations
• Average depth of station 30m below ground level
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Rolling Stock
• Electrified DART Rolling stock
– 1500vDC installed
– Safeguarded for 25KV AC
• 8 car trains
• Journey time Docklands to Heuston <10 mins
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Tunnel Options Considered:
1. Mono-bore mined
2. TBM Mono-bore
3. TBM Twinbore
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Benefits in terms of construction risk, spoil volumes & track gradient
Twinbore Tunnels Recommended in Phase II
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Phase 2 proposed Construction Methodology for Stations
• Cut and cover
– Heuston (mixed face clay and rock)
• Mined
– Christchurch, St Stephens Green, Pearse (limestone )
• Cut and Cover or Shield Driven
– Docklands (Dublin boulder clay)
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Station Details
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Heuston Station
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Heuston Underground Station and Turnback Facility
Heuston Interchange
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Heuston Interchange Access
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Turnback facility and underground station
platforms under Diageo land
Heuston Interchange - Plan A
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Heuston Interchange - Plan B
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Turnback facility and underground station
platforms under Heuston station
Entrance in Heuston station in same location as
Plan A
Heuston Tie-In - Plan B
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Christchurch Station
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Christchurch Station
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Christchurch Station – Construction Site Footprint
Cook Street
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Christchurch Final Footprint
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St Stephen’s Green Station–Plan at Ticket Hall Level
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Common and Overlap Areas agreed between RPA / IÉ
will be Designed and built by RPA
St Stephen’s Green - Shared Concourse with Metro North
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St. Stephen’s Green – Phasing Construction Footprint
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Underpass Under
Construction
Pearse Station Underground Layout
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Pearse Station - Architectural Concept
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Docklands Station
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Connection to
Northern Line
Preliminary design includes an at grade junction connecting Interconnector to Northern Line
However design to be checked for prudent provision for future grade separated (overpass) junction
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Geotechnical Results obtained at 200m intervals along the Route
Heuston
Christchurch
Stephens Green
Pearse
Docklands
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TBM Progress
Current Construction Strategy TBMs and Shield Machines
TBMs Dismantled
(Skin Buried)
Heuston East
Tunnelling Site
Docklands Portal Tunnelling Site
Heuston Portal Tunnelling Site
(TBM Dismantled)
1
1
1
2
2
23
3
3
3
34
4
4
4
4
5
NB: All stations are mined with the exception of Heuston
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END