b'FEATURECHALLENGE HIGHLIGHT: RAIL CORRIDOR OVERBUILDIts the most advanced tower ever constructed inSpanning 16 rail tracks and connecting the towers will be a one-acre parka concept Canada and likely all of North America.that has never been done to this scale before in Toronto.Theresnowaytheoverbuildcouldhave beenbuiltwithanythingexceptsteel,says Steel also comes in ready for erection,ASYOUBUILDIT,CHALLENGESWILLFrank. If any column is taken out, the overbuild adds his colleague Benoit Boulanger, theCOME will still stay up. Enormous steel cantilevers will EngineerofRecordforthetower,whoAfteryearsofplanning,theprojectseven be installed to support a restaurant.started work as a designer for the projectgroundbreaking was held in June 2017. SinceWelookedatconcreteandprecast sevenyearsago.Theresmoretobethen, even with constant communication andconstruction, but for the construction logistics done beforehand, but if it were concrete,coordination with every possible organizationand the economics and space, steel was really columnslikethoseinthetowerlobbyinvolved,challengeshavestillhappenedthe only option, adds Voth. In one evening, would need to be at least twice as large. even when theyre foreseen well in advance. Walterscrewswungintoplacea45.5-metre ManyefficienciesweredevelopedintheA frequent challenge is difficulty in stoppinglong-span truss, the weight of 53 mid-sized planning stages that ended up saving countlesstraffictoaccommodateconstruction.Thecars, over the corridor tracks. There was a days of work, one of which was the use of aincrease in road and pedestrian traffic fromvery short window to stop all train traffic, and custom-made formwork system that was ableone of Canadas most popular entertainmentthey did it perfectly.to climb more than six metres per cycle, whichvenuesimmediatelynextdoorisalsoanAny time work along the tracks was required, has never been done on any project in Canada. ongoing challenge as construction finishes up. a work plan needed to be submitted, reviewed Weworkedcloselywithourformwork,Every time you do one step forward, youand approved for every single operation along rebarandstructuralsteelsub-tradestodotwostepsbackward,tryingtopleasethe long spans. Sometimes Walters only had develop a program that would be based oneveryone,saysBoulanger.Everychangefour hours a night to work, says Boulanger. And a five-day cycle, says Quadrini. This enabledaffects everyone, so we need to discuss themother times there would be a full work crew ready us to form, pour and strip concrete, erect steelconstantlywiththeCity,neighbours,crews,to go, then a train would be delayed, so the entire and curtain wall based on this cycle. architects and tenants. evening would be cancelled.22|SUMMER 2020 ADVANTAGE STEEL'