What is the defining feature of a freestanding tower crane?

The defining feature of a freestanding tower crane is that it is secured to a concrete foundation. This provides stability and support for the crane during operation, allowing it to lift and move heavy loads safely at considerable heights. The concrete foundation anchors the crane, preventing it from tipping or shifting, which is crucial given the significant loads and heights these cranes are designed to handle.

While it might be noted that a freestanding tower crane does not have the mobility associated with cranes mounted on trucks, the essential aspect is its connection to a secure foundation, which distinguishes it within various types of cranes. This foundation allows for the tower crane to maintain its structural integrity while executing tasks like lifting materials to high elevations on construction sites.