特高压跨越施工封网结构力学分析  

Mechanics Analysis on Closed Net Structure in UHV Crossing Construction

作　　者：赵维[1] 黄成云[2] 罗本壁[3] 周焕林[1] 

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]安徽省送变电工程公司,安徽合肥230022 [3]国家电网公司交流建设分公司,北京100052

出　　处：《东北电力技术》2017年第4期1-5,共5页Northeast Electric Power Technology

基　　金：国家电网公司科技项目资助(SGHEJY00TGJS1600057)

摘　　要：封网结构对于保障特高压跨越输电线路施工安全具有重要意义,其具有较高的技术和施工要求,但目前对于其研究大多简化为单索计算。为与实际状态更符合,考虑绝缘撑杆及网的影响,利用有限元软件建立封网结构模型,对封网结构在不同工况下的力学性能进行分析。研究结果表明:随档距增大,承载索弧垂和最大张力均增大;随预紧力增大,承载索弧垂与最大张力分别呈线性减小与增大;随承载索间距增大,弧垂和张力也明显增大;随承载索直径增大,会使封网装置与被跨物的安全距离更得到保障,但承载索最大张力会显著增大;全封网形式承受冲击荷载的能力显著强于局部封网。Closed net structures of great significance for the protection of the safety of UHV transmission line crossing construction, which has high requirements on construction technology. At present, most of the studies are simplified to single cable. For more in line with the actual state, the influence of insulation rod and net is considered. The model of closed net structure is built by finite element software and the mechanical properties of closed net structure are analyzed in different work conditions. The results show that the sag and tension of carrying cable increase with the increase of span. With the increase of pretension, the sag and the maximum tension of the cable linearly decrease and increase, respectively. With the increase of carrying cable spacing, the sag and maximum tension in- crease significantly. With the increase of carrying cable diameter, the safe distance between closed net and crossed object is more se- cure, but the maximum tension increases sharply. The ability of whole closed net arrangement to bear impact load is significantly stron- ger than that of partial closed net.

关 键 词：跨越施工 封网 有限元法 弧垂 张力 

分 类 号：TM753[电气工程—电力系统及自动化]