Quote:
Originally Posted by SamInTheLoop
^ Funny, that actually crossed my mind as well, that this one could only be for a first stage of superstructure erection. But, then I was thinking - would the eficiencies to potentially be gained from a more traditional core-located tower crane be enough to justify the logistics of this all (instead of just sticking with this one the whole way)??
At any rate, I'm fascinated by this stuff.....
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I heard the crane configuration on this project was brought about by a new Lendlease policy that the typical internal crawling crane used in all other offices in chicago and most other large cities is no longer safe because the crane company is no longer in business and cannot provide certification of that type of crane.
An internally climbing crane was preferred by the city (the permit application for this configuration was rejected multiple times) and would have been more cost effective for the project. It would also not have required the 480v generator you see on the platform in the photos and would not have required the considerable temporary steel in the middle of the future lobby. This configuration no doubt came at a premium of hundreds of thousands of dollars.
To address the comment above, this will be the only crane for the project.
Very cool engineering. It's not often you see something like this.