how skyscrapers, arenas and stadiums are safely built when they are so high up that machinery can’t reach the top
In: Engineering
They also use something called [slip forming.](https://en.wikipedia.org/wiki/Slip_forming) The concrete form for the building is constantly moving upwards. Fresh concrete gets poured up top, hard cured concrete comes the bottom. The forms moves up by jacks secured to the hardened concrete.
[https://www.youtube.com/watch?v=XEAc11FHzpY](https://www.youtube.com/watch?v=XEAc11FHzpY)
[https://www.youtube.com/watch?v=rIMxXsyzzM8](https://www.youtube.com/watch?v=rIMxXsyzzM8)
Cranes can then be attached to the top, like others have mentioned, to haul up all the other stuff like cladding and mechanical equipment.
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