Abstract:

Based on the analysis on the damaged towers caused by conductor galloping in transmission lines and its characteristic statistic, it was found that the joint bolts were the weakest point of whole tower in anti-galloping performance, through the analysis on the bearing behaviors of tower and joint bolts. According to the manufacture and construction characteristics of existing joint bolts, the possible factors to locking performance of joint bolts had been tested and analyzed by using the locking performance test method of existing fasteners. The results show that the initial pre-tightening force is the most critical factor to the locking performance of joint bolts. Through the comparison test on the performances of different lock types, it is found that the double-nut connection types can present excellent locking performance with proper installing method. According to the test results and the construction process of transmission tower, this paper proposed some promotion measures and improvement suggestions for the selection and construction method of joint bolts, which could provide guidance and reference for the anti-galloping reconstruction of transmission tower.

Key words: transmission tower, joint bolts, anti-galloping, locking performance