输电杆塔联接件的抗舞防松性能测试与分析

在输电线路舞动造成的杆塔受损及其特征统计分析的基础上,通过对铁塔杆件及联接件的承载特性分析发现紧固联接件是输电杆塔抗舞性能最薄弱的环节.根据现有紧固联接件的生产、施工特点,利用现有紧固件防松性能测试方法和手段,对影响铁塔紧固件防松性能的各类因素进行系统测试和分析,结果表明：初始预紧力是影响联接件防松性能最关键的因素;通过不同防松型式的性能对比测试发现,双螺母联接在“正确安装”时能够具有较好的防松效果.根据试验结果与输电杆塔的施工经验,对杆塔联接件的选型和施工方法提出了相应的提升措施和改进建议,供输电杆塔抗舞性能改造参考.

Anti-Galloping and Locking Performance Test and Analysis of Joint Bolts in Transmission Tower

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.