摘要
悬索式跨越架通过输电线路跨越档两侧输电铁塔上的临时横梁来悬挂柔性封网装置,以便保护下方被跨越物的安全。导线在张力放线断线事故工况下通过悬索式跨越架将冲击载荷传递至输电铁塔。针对跨越档铁塔在设计中未考虑导线放线事故工况的现状,以某工程5E1-SZKK型铁塔为研究对象,分析了事故工况下悬索式跨越架对铁塔的影响及补强措施。提出了基于柔性体非线性动力学的导线冲击仿真方法,仿真结果显示,铁塔所受冲击载荷最大峰值达到107.5 kN,且各点受载方向复杂;塔身斜材790-820杆与900-952杆分别超限0.438与0.473。对5E1-SZKK型铁塔通过增大截面技术补强后,杆件利用率满足要求。
The suspension span frame is connected with the transmission tower through the temporary beams on both sides of the transmission line crossing span and the hanging flexible sealing device is used to protect the safety of the crossing objects below.The impact load of the conductor is transmitted to the transmission tower through the suspension span frame under the condition of conductor breaking accident.At present,the condition of conductor breaking accident is not considered in the design of the spanning tower,in view of this,influence of suspension span frame on transmission tower under accident condition and reinforcement measures are analyzed through the 5E1-SZKK tower.A simulation method of conductor impact based on nonlinear dynamics of flexible body is proposed.The simulation results show that the maximum value of the impact load on the tower is 107.5 kN and the loading direction of each point is complex.The 790-820 and 900-952 diagonal members of the tower exceed the limits by 0.438 and 0.473 respectively.After the reinforcement of 5E1-SZKK tower by increasing the section technology,the utilization ratio of the members meets the requirements.
作者
马勇
夏拥军
徐铼
贾宁
薛正元
MA Yong;XIA Yongjun;XU Lai;JIA Ning;XUE Zhengyuan(Institute of Transmission and Transformation Engineering,China Electric Power Research Institute,Beijing 100055,China;State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211106,China;Jiangsu Power Design Institute Co.,Ltd.,Nanjing 210024,China)
出处
《南方电网技术》
CSCD
北大核心
2020年第12期58-65,共8页
Southern Power System Technology
基金
国家电网公司科技项目(GCB11201900108)。
关键词
悬索式跨越架
事故工况
跨越铁塔
冲击载荷
补强措施
suspension span frame
accident conditions
crossing tower
impact load
reinforcement measures
