Which method is used to determine the installation integrity of tower bolts?

The installation integrity of tower bolts is best evaluated using torque tension measurement. This method involves applying a specific amount of torque to the bolts, which ensures that they are tightened to the correct specification. Proper torque is crucial in ensuring that the bolts can adequately bear the loads applied to the tower structure and maintain its stability. Insufficient torque could lead to loosening over time, which might compromise the tower's structural integrity.

In contrast, visual checks, while necessary, may not reveal issues related to the tightness of the bolts or hidden defects that could affect integrity. Structural analysis assesses the overall design and load-bearing capability of the structure but does not specifically evaluate the proper installation of individual bolts. Vibration testing is useful for assessing the performance of the entire structure under operational conditions but is not a direct measure of bolt integrity on installation. Thus, torque tension measurement is the most effective method for confirming that bolts are installed correctly and securely.