Harold’s Square Construction Update, 2/2018

22 02 2018

Not all cranes come on wheels. Many larger cranes are assembled and disassembled on site. A concrete crane pad is formed and poured to provide a base for the crane, with the pieces assembled upward from the base. That’s what you can see in the photos below. The size can vary depending on the size of the crane required, whether it’s free-standing or tied-in, whether there are rock anchors that can be used, and the soil upon which it and the pad will rest. Here, the crane pad will rest on a thick, firm mud layer beneath, and the concrete will be reinforced with a tied-in (meaning the grid bars are tied together) steel rebar grid. According to the Harold’s Square website, the crane pad itself will rest on a 4’6″ deep concrete, 38′ x 38′. Keep in mind, there will actually be two cranes on-site. The one mounted here will be the heavy-duty 300-ton crane, but they construction team will use a mobile 55-ton crane as well. The elevator pits are also being boxed and formed.

All the piles have been driven in at this point, and the sides of the site have been shored up as necessary with lagging and steel H-beams. The low-rise Commons-facing portion of the building will utilize an 18″ rebar-reinforced mat slab foundation, while the tower portion will have a 30″ rebar-reinforced mat slab. These pours should happen by mid-March. The structure will be anchored into the foundation, which will evenly distribute the weight and support the floors above. After the foundation is in, the only way to go is up.


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