中卫─文昌110kV送电线路11号铁塔倒塌原因分析

Cause analysis of No.11 tower collapse in 110 kV power transmission line from Zhongwei to Wenchang

针对中卫-文昌110 kV送电线路11号转角塔在未超条件使用的情况下,架线后发生倒塔事故,通过现场调查并对铁塔破坏处的结构进行受力分析与核算,结合现场塔材的破坏情况提出具体处理方案和预防措施。分析结果表明:基础根开的施工误差偏大产生了腿部主材较大的附加内应力,而该附加内应力正是导致铁塔过载破坏的根本原因。

Aiming at the accident of No. 11 angle tower collapsed in 110 kV power transmission line from Zhongwei to Wenchang during the ordinary state, by investigating of locale and making the stress analysis and calculation for the structure at place of tower collapsed, puts forward the transaction scheme and prevention measure. The analysis result shows that the larger constructing error of dis- tance between the two foundation roots produce the more additional internal stress in main material of the tower leg, it is the additional stress just about the basice cause of tower overload to collapse.