Screwing a new condo into place

I have been puzzled for weeks by a forest of pipes sticking out of a construction site on Gerrard Street, between Coxwell and Greenwood. What are the pipes for? Today, the sign on a workman’s pickup door led me to this explanation:

So now I know. A foundation-building method I’ve never seen before. The pipes will root the concrete foundation into sandy soil. that Otherwise it would not be stable enough to support a multi-storey building. Hope it works!