Quote:
Originally Posted by Fvn
That looks like they're coring something. I know when they did the transit center next door they had problems driving sheet piles and had to drill out some old concrete in order to do so.
Concrete trucks are possibly filling an old utility vault/duct.
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That is a secant operation - never seen it done with this kind of rig.
They will drill holes that are just about touching - filled with concrete and usually an I-Beam - then after those cure come back and drill down betwen each nearly touching hole, fill that with concrete and rebar, and walla - a wall.
Same thing that has been done at One Chicago.
Some
Secant Wall shots from One Chicago, da Spire, 9 W Walton, and OMP