They have to install the entire "table top" steel and carry out all of the field welding at the node-to-pipe joints before they can fill the legs with concrete, as the unbalanced weight that results as each leg is filled from the base up 70-feet would cause some lateral movement if the steel diaphragm wasn't complete. I'll try to remember to post when the concrete filling is taking place...
 
This photo was taken at dawn a couple weeks ago - no touch ups whatsoever.

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They have to install the entire "table top" steel and carry out all of the field welding at the node-to-pipe joints before they can fill the legs with concrete, as the unbalanced weight that results as each leg is filled from the base up 70-feet would cause some lateral movement if the steel diaphragm wasn't complete. I'll try to remember to post when the concrete filling is taking place...

Thanks! That's pretty neat to know - I can't think of any project in Toronto that worked this way, OCAD maybe? Don't recall if the legs are filed in that case.

AoD
 
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Taken this morning December 08, 2013.

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Thank you Ingrid Gold - it's nice to see some coverage of the most structurally daring office development. Hoping the curtainwall for the lobby will be using some ultralow iron glass (e.g. entrance portal of the Royal Conservatory of Music).

AoD
 
Walking around downtown with a friend of mine the other day, she didn't believe me when I told her that the X columns will be holding up the office building above it. Didn't think it was possible. This building is awesome.
 
That's a great angle. It's good to see a heritage building in good shape and infill going up next to it. In countless American cities, you'll find a building like this one amidst empty lots that might not get any infill development for years, if not decades. It's an image of traditional urban vitality.
 

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