Views: 2 Author: Site Editor Publish Time: 2022-07-14 Origin: Site
Have you ever looked up at a tower crane and noticed it seemed to be leaning? Your eyes aren’t deceiving you, but this isn’t necessarily a reason to be concerned. The steel used in the construction of a crane is strong and rigid, but even steel has some flexibility. The lean you are seeing is most likely due to that flex in the steel as the various loads are balanced against each other.
A tower crane, like most cranes, works on leverage and balance. One could say that a tower crane is a lever on top of a lever.
The jib and counter-jib serve as the first lever balancing the lifted load against the counterweights. If there is no load on the hook, the counterweights will cause the crane to be somewhat unbalanced towards the rear, and the crane will lean backward. As load is applied to the hook, the crane will gradually lean forward due to the shifting balance of the load vs. the counterweights. This is normal and expected. You could see several feet of movement at the top of the crane when lifting a heavy load with a tall crane.
Since the mass of counterweight is fixed, but the load being lifted varies greatly, there is usually some level of imbalance at the top of the crane. This imbalance results in a force at the top of the crane which is then balanced through the tower against the size and mass of the base. That is, the tower mast is essentially another lever.
Ultimately, the mass and size of the foundation is engineered to ensure the stability of the crane against these working loads & other factors.
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