What percentage of bolts must be in place before erecting the next section of a tower?

In the context of tower construction, ensuring structural integrity and safety is paramount. The correct percentage of bolts that must be in place before erecting the next section of a tower is typically set at 50%. This requirement is based on engineering standards and safety protocols that aim to provide sufficient stability and support for the new section being added.

Having a minimum of 50% of the bolts installed means that there is enough initial reinforcement to support the weight and stresses that will be introduced when additional sections are assembled. This ensures that the structure can safely withstand environmental loads such as wind and potential dynamic forces during the construction phases. If fewer bolts were in place, the risk of instability increases significantly, which could lead to accidents during the construction process.

While other percentages such as 25%, 75%, or 100% may seem viable at a glance, they either do not provide adequate support for safely hoisting and joining new sections or require unnecessary delays by completing bolting beyond what is practical before advancing the next phases of construction. Therefore, the specification of 50% strikes a crucial balance between safety and efficiency in the erection of tower structures.