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Since completing the concrete pour of its 7th level in our last story earlier this month, crews working on Mizrahi Developments' The One have wasted no time, with forms for the walls of the 7th level being assembled just one day after the slab pour was completed.
Now the first set of regular floors in the building truly start, and we will begin to see how fast the crew can actually go. The 7th level is the first of the repeating hotel suite levels, and the forms that have been built on this level for the walls and for the 8th floor slab will be able to be reused to form the floors throughout the hotel levels, meaning that construction will speed up as a result. New forms will be needed again for the mechanical levels at 17 and 18, and for the condo levels which will start at 19.
A week after crews had started to assemble them, the wall forms had come a very long way.
Taking a look from a different angle, of particular note are walkways constructed beside the walls for that construction workers can guide the end of the concrete pump to exactly where the pour is needed:
With the forms in place, the concrete pour began in the northeast corner of the level. As seen below, with the extendible arm of concrete pump stretched across the floor, crew members stationed on the plywood walkways guide it to the opening of the formwork, gradually filling all of the forms with concrete. Once the pour was finished, the forms and walkways were left long enough for the concrete to cure.
Before forming of the 7th floor walls was complete, the next step was already underway, with form work for the 8th floor slab underway. In the centre of the image above, an array of reinforced blue shoring poles can be seen, held in a grid by yellow trusses. Once that support is in place, sections of slab forms can be installed above them. That stage is best seen to the left in the image above where a slab form is mid-construction, two reinforced wall columns sticking up through its middle.
Two days later in the image below, the wall forms and walkways have been removed, with the sections of floor slabs coming together ahead of the rebar installation.
At the beginning of this week all of the slab forms had been completed, and – despite the late winter snowfall – the rebar for the 8th floor slab was laid.
Yesterday, the concrete was poured for the first time onto the forms of the 8th level.
Once the slab's concrete has cured, the shoring poles will be lowered and the slab form will be disassembled and removed from below, its parts to be used again on the next level. Already today though, crew members were guiding more concrete into brand new 8th floor wall columns, and the process to build another floor cycling again.
The process of forming the walls of the 7th floor and the slab of the 8th floor took 20 days – clocking in as the quickest floor completion at the project since it began construction four years ago. As the weather improves and the repeating levels are built, we can expect quicker times for each floor until the first mechanical floors are reached, when new forms will be needed again.
Designed by UK-based architects Foster + Partners with Toronto's Core Architects, The One was approved at a height of 85 storeys, 308.6 metres. The building is among the pair of projects currently contending for the title of Canada's tallest building, along with the 312.5-metre SkyTower at Pinnacle One Yonge, which is now in the early stages of construction only a couple of kilometres to the south.
Mizrahi Developments has applied for an increase in height and density for The One to rise to 94 storeys and 338.3 metres high. If the increase is permitted, The One would take the record as the tallest building in the country.
More information on this development will come soon, but in the meantime, you can learn more from our Database file for the project, linked below. If you'd like, you can join in on the conversation in the associated Project Forum thread, or leave a comment in the space provided on this page.
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