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what is the purpose of those long metal piles?
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Pretty sure it's for shoring
 
There's many different kinds! I think they are building a retaining wall at the back between this lot and the building behind.
Has to do with RQD testing if it sits in certain range they used different sizes/ dimensions. (rock quality designation). Might also have to do with principal stress direction but I’m not too sure about that. Anyways that’s what they do in mining.
 
This is such a huge project. We rarely see developments of this scale in Ottawa. This will be a huge bump to housing starts for this year.
 

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