These guys are building the middle support columns for a bridge that will span from where I'm standing to the abutment on the other side of the street, across from the equipment. The guys working below are building a CIDH (cast in drilled hole) column. A hole is drilled in the ground (this one looks about 6 feet in diameter and goes down quite a ways), and a pre-tied steel cage is then lowered into the hole by the crane, which is probably 6" smaller than the hole in diameter. The hole is then filled in with concrete, the green steel arm you can see is the concrete pump. The huge concrete blocks you see are deadmen (weights) which are used to support guy wires that keep the steel cages in place while the hole is being filled with concrete.
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