The construction crew are building the re-bar cages for the pier holes.
Most commercial buildings have piers under the foundation.
A pier is a drilled shaft varying in diameter and depth. There will be about 186 piers under our new facility. After the pier hole is drilled, a cage made of re-bar or steel concrete reinforcement bar is put down the hole and then is filled with concrete. Pier drilling is used for certain structures and buildings to help minimize structural damage done by ground shifting or ground settling.