The Confederation Line Ottawa LRT Project

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The Confederation Line Ottawa LRT Project The Confederation Line Ottawa LRT Project Tom Middlebrook, P.Eng Senior Vice President, Business Development – Canada Dragados Canada PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook Project Stakeholders Sponsors Equity Developers Project Co Design Build Joint Venture Maintenance Team Engineering Joint Venture PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 1 City of Ottawa • Canada’s Capital City with population of 950,000 • Problem: saturated with buses (BRT) • Solution: replace BRT with Light Rail Transit (LRT) Yukon Northwest Territories Nunavut Newfoundland / Labrador British Columbia Alberta Manitoba Quebec Saskatchewan Ontario Prince Edward Island New Brunswick Nova Scotia PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 2 Confederation Line • 12.5 km LRT line with 13 stations • 10 km at grade in existing BRT Right-of-Way • 2.5 km tunnel between Ottawa University (uOttawa) and Pimisi • 3 underground stations: Lyon, Parliament and Rideau PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 3 Initial Design Approach • Running tunnel: TBM tunnel (mono tube or twin-tube) • Underground stations: cut- and-cover PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 4 Design Options Option Pros Cons Design Single • Lower cost • Higher risk of settlement minimized by Scheme Tunnel • Flexibility in operation rock quality • Multiple faces • Higher cost and longer schedule Twin Tunnel • Overlapping of • Potential impact on building basements construction activities Excavation • Speed • Paleovalley (soft soil) Procedures • Open mode • Possible damage to building basements TBM • One pass lining • Coordination required with stations • 1.5-2 years TBM procurement • Speed • Urban restrictions Drill & Blast • Economy • Noise • Multi face • Vibrations • Flexibility, Geometry • Lower speed Mechanical • Multiple faces • Mobilize quickly PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 5 Tunnel and Underground Stations Existing Utilities in LYON Station PARLIAMENT Station Parliament Station PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 6 Construction Challenges • Congested downtown core • Mixed ground conditions Low rock • Significant potential for cover Utilities impacts on buildings • Wide span ~ 18m Rock bolts • Potential obstructions: rock and tie backs dowels & tie backs • Complex utilities Adjacent buildings PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 7 Implications • Cut-and-cover or top down excavation not feasible • Twin-tube tunnel not feasible • High risk for TBM operation Cut-and-cover social cost: business from complex and unknown interruptions utilities, and presence of tiebacks and bolts from existing structures • Flexible and adaptable tunneling method required PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 8 Selected Construction Method • Sequential Excavation Method (SEM) • Equipment used: – Excavation: 3 roadheaders (SANDVIK MT-720) – Mucking: LHD loaders Roadheader Loaders PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 9 Work Planning Three independent tunneling teams were deployed at separate access points Ottawa University Apartment complex East Portal University residential complex PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 10 Construction Challenges Lyon and Parliament Stations • Challenge: Build 18m wide • Solution: Tension ties stations in between buildings 20m apart. • Design issue: Potential horizontal load transfer onto the adjacent buildings PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 11 Excavation Sequencing Lyon and Parliament Stations & PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 12 Excavation Sequencing Lyon and Parliament Stations LYON Station PARLIAMENT Station Without Ties With Ties 3a 2a 2a 2b 1a 1b 2b Excavation 2b Stages 1a 4 1b 3a 3b PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 13 Construction Challenges Rideau Station Proximity to existing sewer tunnels and Rideau Canal PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 14 Excavation Sequencing Rideau Station In Soil PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 15 Excavation Sequencing Rideau Station In Rock PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 16 Gallery PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 17 Running Tunnel PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 18 Excavation with Tension Ties Lower side drifts Permanent side walls With Ties 3a 2a 2b 2b Side drift 1a 4 1b Preliminary tension backfilling PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 19 Lyon Station Cavern Excavation at Lyon Station PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 20 Parliament Station PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 21 Rideau Station Rideau Station – Hard and Soft Ground PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 22 Rideau Station Rideau Station Cavern Arch Concrete Work PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 23 Photo Credit: Giuseppe GaspariIn the 21st century, the construction of new infrastructure in urban areas should not negatively affect stakeholders Innovation in Tunnelling is Key to reach this goal. Ottawa’s Confederation Line LRT Tunnel proves that it can be done Confederation Line LRT Multi-Dimensional Underground Space Photo of the Year, Tunnel Association of Canada PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 24 TAC 2017 Canadian Infrastructure Project of the Year https://youtu.be/P0h0qk36mqk PARIS – 15 November 2017 The Confederation Line - Ottawa LRT Project | Tom Middlebrook 25.
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