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Question:

how do they get cranes on top of building sites?

how do they get cranes on top of building sites?

Answer:

With anouther crane.
It's crazy but they actually use the crane to build itself!!!
Good Freakin Question! With a bigger crane?
One way is another crane, although I think you are talking about the ones for really tall buildings. In those cases, they use a crane (self-hoisting tower crane) that is able to raise or hoist itself up as construction continues. For example, it will be working on the 10th floor, and then it will climb the recently placed girders to the 11th floor, and so and so forth. Sometimes the crane is disassembled at the top... other times, it is kept there to aid in window washing.

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