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Design and Construction of Large Diameter Storm Water Retention Shafts for the Coxwell Bypass Tunnel
The City of Toronto’s Don River and Central Waterfront and Connected Projects (DRCW Project) aims to reduce Combined Sewer Overflows (CSOs) into the Lake Ontario and Don River watersheds. Once completed over the next 20 years, it will be comprised of approximately 22 km of tunnels, 12 shafts, and will intercept 27 CSOs connections in the City of Toronto. Black & Veatch in association with R.V. Anderson Associates Limited were retained to perform the detailed design and provide construction support services for phase one of the project, referred to as the Coxwell Bypass Tunnel. North Tunnel Constructors ULC is currently working to construct 10.5 km of the 7.3 m outer diameter rock tunnel, five large-diameter storage shafts, and 14 small-diameter drop shafts to allow for future diversion of CSOs. The five storage shafts range from 20-22 m in diameter and extend to depths of 58 m through both rock and soil. Key shaft features include a composite roof slab consisting of long spanning pre-cast concrete panels and a 3 m thick hemispherical concrete base slab to help resist the large hydrostatic uplift pressures applied across the slab. In addition to an overview of the structural design of these shafts, this paper will discuss the construction methods and in-field engineering solutions employed to keep the project moving forward and on schedule. The construction portion of the paper discusses the project team’s construction experiences and solutions to challenges associated with shaft construction, including shoring installation and excavation, concrete reinforcement placement, pouring and monitoring temperatures of mass concrete, and construction of the shaft walls using suspended jump forms.
Design and Construction of Large Diameter Storm Water Retention Shafts for the Coxwell Bypass Tunnel
The City of Toronto’s Don River and Central Waterfront and Connected Projects (DRCW Project) aims to reduce Combined Sewer Overflows (CSOs) into the Lake Ontario and Don River watersheds. Once completed over the next 20 years, it will be comprised of approximately 22 km of tunnels, 12 shafts, and will intercept 27 CSOs connections in the City of Toronto. Black & Veatch in association with R.V. Anderson Associates Limited were retained to perform the detailed design and provide construction support services for phase one of the project, referred to as the Coxwell Bypass Tunnel. North Tunnel Constructors ULC is currently working to construct 10.5 km of the 7.3 m outer diameter rock tunnel, five large-diameter storage shafts, and 14 small-diameter drop shafts to allow for future diversion of CSOs. The five storage shafts range from 20-22 m in diameter and extend to depths of 58 m through both rock and soil. Key shaft features include a composite roof slab consisting of long spanning pre-cast concrete panels and a 3 m thick hemispherical concrete base slab to help resist the large hydrostatic uplift pressures applied across the slab. In addition to an overview of the structural design of these shafts, this paper will discuss the construction methods and in-field engineering solutions employed to keep the project moving forward and on schedule. The construction portion of the paper discusses the project team’s construction experiences and solutions to challenges associated with shaft construction, including shoring installation and excavation, concrete reinforcement placement, pouring and monitoring temperatures of mass concrete, and construction of the shaft walls using suspended jump forms.
Design and Construction of Large Diameter Storm Water Retention Shafts for the Coxwell Bypass Tunnel
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / McGrath, Matt (author) / Hinh, Vireak (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 62 ; 903-917
2023-08-06
15 pages
Article/Chapter (Book)
Electronic Resource
English
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