[bomberjet]

I'm not an expert on piles. But I believe there is a certain way to install them that limits heaving. Hammering lots of piles in a small area will actually heave the ground they are being driving into.

So maybe they are installing them in a more even fashion across the site to limit the heaving?? Remember these are driven piles and not caissons, for what looks like the parkade portion of the tower.