Who determines the spacing between vertical ties to secure an external tower crane to a structure?

The spacing between vertical ties used to secure an external tower crane to a structure is primarily determined by the manufacturer or engineer. This determination is based on a variety of factors, including the crane's design specifications, load capacities, and the overall structural integrity required for safe operation. The manufacturer typically provides guidelines based on thorough testing and engineering analysis, ensuring that the crane can handle the intended loads while remaining stable and secure.

In professional practice, engineers assess specific site conditions, calculating the appropriate spacing that meets safety standards and structural requirements. This ensures that adequate support is provided to prevent any tipping or sway, which could endanger workers and the integrity of the crane's operation. The involvement of qualified personnel, such as engineers, is vital to adhere to industry standards and regulations that govern crane use, thereby promoting safety on construction sites.