不饱和聚酯树脂在电气化铁道低净空跨线桥绝缘板上的应用于同福（天津市合成材料厂，３００１６３）１．前言铁路旧线在电气化改造中，低净空跨线桥下架设接触网，是一个很大难题。特别是一些超低净空跨线桥，导线接触网与桥梁之间净空距离太小，高电压牵引导线接触网所产... Application of Unsaturated Polyester Resin to Low-clearance Fly-ash Bridge Insulation Boards in Electrified Railway Tongfu (Tianjin Synthetic Material Factory, 300163) 1. Preface In the electrification of old railway lines, it is a big problem to set up a contact net under the low-head flyover. In particular, some ultra-low headroom flyover, the distance between the cable contact network and the bridge headroom is too small, high-voltage traction wire contact network produced ...