How are tall cranes assembled? Wouldn’t it require a taller crane?

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How are tall cranes assembled? Wouldn’t it require a taller crane?

In: Engineering
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They lift the cab and boom and insert a section of truss….over….and over…. and over agin

https://youtu.be/vx5Qt7_ECEE

I assume you are talking about a tower crane. You’re correct in the sense that another crane is required but the extension boom of a mobile crane can actually lift the pieces of the crane quite high. The bottom of a tower crane is bolted down to the ground and sections of the frame and slowly added and attached until the desirable height is reached.

Damn you Reddit. This happens all the time. I scroll and see nothing too interesting so I decide to go do something else and as I’m closing the app a question like this catches my eye and suddenly I NEED to know how frickin cranes are assembled

There’s a frame just big enough to fit a section of the tower inside it, so you build the first little bit of the tower, put your crane and big frame on top (using a smaller truck-mounted crane), then you jack that frame up high enough that you can fit another section of tower, bolt it all together, and repeat that until you’ve got your crane all built up.