b'PROJECT PROFILEROLES &SIGNIFICANT FEATURES concrete canopy was done on a platform, The main feature atrium in the stationexplains Brazeau. In addition to the kidney RESPONSIBILITIES building contains significant architecturalshaped concrete canopy, large, slanted columns, which demanded challengingconcrete columns extend from the building OWNER: Metrolinx / GO Transit formwork carried out 75 feet abovefoundation to the curved, case-in-place CONSULTANT: AECOM ground. When the formwork was removed,concrete roof. Also, the building exterior is youre left with these massive concretehung with irregular precast pieces. Each DESIGN CONSULTANT: IBI Group beams that span the atrium and that areone is unique and the heaviest weighs CONCRETE FORMWORK & PLACEMENT:highly visible, notes Brazeau.55,000 pounds.Kenaidan Contracting Ltd. Adding to the complexity, the concrete work MECHANICAL: JGM Mechanical schedule was compressed to win backAn extensive engineering and hoisting plan time lost to the soil-improvement process.was developed by Kenaidan and Global ELECTRICAL: Montana Electrical In order to expedite the schedule, wePrecast for the installation. The roof and EXCAVATION: Pall-Con Construction Ltd. actually built the entire structure withouteach floor below cantilevers over the sides post-tension, saving us about a month of the building, so to install the precast AGGREGATE PIERS: Geo-Foundations per floor, says Brazeau. The downsideon the exterior, we installed sleeves on REINFORCING STEEL: Gilbert Steel was that we had to shore the entirethe concrete of the roof and the other structure; we had to bring in formwork forfloors to put the rigging through to hoist STRUCTURAL STEEL: three floors. the precast, Brazeau says. Altogether, he United Structure Fabrication concludes, this by far is the most complex, METAL FABRICATIONS: On the platform level, it was the first timearchitecturally significant concrete project Brascon Stainless Steel Fabricators Inc. that a full kidney-shaped, cast-in-placeIve ever been involved with.ELEVATOR: KONE ElevatorsLANDSCAPING:Lakeridge Contracting Ltd.MTO ROADWORKS:Dagmar Construction Inc., Gazzola Paving(Highway 404) to the east, a major CN rail corridor to the west and Bloomington Road to the north. We had to rebuild three highway ramps, widen the CN railway corridor bridge across Bloomington Road and widen the road itself. We also upgraded and added new signalized intersections to enhance the safety of traffic and people coming in and out of the station.But the greatest challenge was the ground itself. The soil had poor load-carrying capability and, as a result, the foundation designs for the building needed to be modified. The area required several different specialized underground construction techniques at different locations to provide the necessary support for the structure. Initially we drove steel H piles into the ground, and they just kept going and going; we never hit refusal, says site superintendent Scott Brazeau of Kenaidan Contracting Ltd., the general contractor. IBI Group designed a series of rigid inclusions with secant wall to address the poor soil conditions. The Bloomington GO station makes extensive use of architectural concrete, which Kenaidan self performs. All of the concrete formwork design and execution was done inhouse, Brazeau says.BUILDERSDIGEST Quarter 1 202129'