Denison Road Grade Separation
Client: Metrolinx (GO Transit)
Location: South Geoergetown Rail Corridor Road, Toronto, Ontario
Project Status: Construction commenced in fall 2010, and is expected to be completed in summer 2013.
R.V. Anderson Associates Limited was retained by Metrolinx to carry out detailed design and provide services during construction for a new railway grade separation for improved rail service and for the Union Station–Pearson Airport Rail Link. The project includes two reinforced concrete railway bridges, tieback retaining wall system, and a new precast storm retention tank under Denison Road.
The GO Transit bridge is a three-span, 45 m long structure, consisting of a 1.5 m thick, 18 m wide, reinforced concrete deck to support four GO tracks.
The adjacent CP Rail bridge is a three-span, 45 m long structure. The bridge is 10 m wide, which can be widened in the future for one future track for a total of three tracks. The superstructure also consists of a 1.5 m thick reinforced concrete deck.
Both bridges are supported on a total of 86 reinforced concrete caissons drilled to an average depth of 22 m into the ground, with 3 m sockets into sound shale. Drilled caissons were chosen in the final design over driven steel H-Piles to reduce noise and vibration to the surrounding community.
As part of the grade separation, a total of 465 m in length of sheet-pile cutoff walls will be driven into the ground prior to excavation. During stages of excavation, up to four layers of prestressing tieback anchors will be installed along the front face of the sheet-pile wall. The sheet-pile wall will be covered with precast face panels.
The 3800 m³ storm retention tank is approximately 137 m long and is located 1 m below Denison Road. This tank consists of a total of 74 precast concrete units, which are 10 m wide by 4 m high.
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