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Keeping in mind the OP seems to be a new guy and is looking for help ---

From a commercial side of things, I typically tried to make the structural guy handle the crane. It doesn't matter if it's a steel frame or cast-in-place. He's on the critical path, so he gets priority on the use of the crane. In most cases, they will do lifts for other subs when the crane isn't busy. I try to put something to that affect in their contract. Maybe I get 2 hours a week as long as it's scheduled. And you get an hourly rate (including overtime) if you need more. Part of this is having some kind of relationship with various subs and suppliers.
I think he's asking who coordinates the usage of the crane on real big jobs like high rise construction where the crane(s) are on site for months or years. It varies by project but in general; The GC hires the crane company and the crane company has a scheduler(s) on site. If the steel guys need it for picks all day on Monday but the electrician needs a pick the same day. The crane coordinator will work out the scheduling. Some jobs the steel subs and concrete subs will have their own crane for their work only and a second crane is used for the other trades that don't require a lot of usage. I've only ever had a job where we, the GC paid to had a crane on site long term. We paid the crane company a lump sum to have it on site and the crane company billed the subs hourly for usage.
 
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