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Good2go has it (mostly) right. Those are foundation drills (not sure if that's what they are actually called). They bore a fairly large hole down to solid ground, and fill it with rebar and concrete. The foundation footers then rest on top of them.
Good2go has it (mostly) right. Those are foundation drills (not sure if that's what they are actually called). They bore a fairly large hole down to solid ground, and fill it with rebar and concrete. The foundation footers then rest on top of them.
Interesting. I assumed they were drills of some sort, but I couldn't figure out why they were drilling huge holes at the site of a school. Underground tunnels for the reptilians who control the education system, I assumed.