地铁架空地线的防雷接地方案研究

Study on Lightning Protection Earthing Scheme for Subway Overhead Earthing Wire

本文基于阻碍钢支柱与桥梁钢筋间形成杂散电流通道但提供雷电流泄放通道的方法,对架空地线的防雷接地方案进行了研究,提出架空地线防雷接地方案选用原则,分析既有接地方案的不足,提出采用雷电冲击接地器接地的新方案。完成了雷电冲击接地器样品试制并在工程中试用,建议在今后地铁工程高架桥架空地线防雷接地设计时选用。

The paper studies the lightning earthing scheme for overhead earthing wires on basis of a method that the stray current channel between steel mast and steel bars of bridge beam is obstructed but the channel for discharging of lightning current is offered, puts forward the principle for selection of lightning protection earthing scheme for overhead earthing wire, analyzes the disadvantages of the existing earthing scheme, raises a new scheme on basis of the earthed lightning strike earthing device. The samples of lightning strike earthing devices are tested and applied in engineering application, and they are proposed to be selected and applied for design of lightning protection earthing of overhead earthing wires for subway viaducts in the future.