中国高铁道床板接地作业指导书.doc

宜昌至万州新建铁路道床板接地与绝缘作业指导书编制： 审核：二八年八月三十日一、 道床板接地1. 接地设置道床板接地设在线路左侧。无砟轨道中的接地钢筋利用道床内结构钢筋每线轨道设三根，纵向接地钢筋采用道床板上层轨道中心和最外侧两根钢筋，每块道床板内设一根横向接地钢筋，纵横向接地钢筋交叉点应焊接，接地钢筋不得构成电气环路，接地钢筋与其它钢筋交叉时应进行绝缘处理。道床板接地每100m（16块单元道床板）形成一个接地单元，接地单元中部与线路左侧水沟槽底“贯通接地扁钢”单点“T”形可靠连接。每个接地单元之间各接地配件设置位置见“道床板接地设计图”。结合左线出口水沟槽底已预留的接地扁钢设置，本隧道内接地单元设置位置如下表。接地单元编号起始里程终止里程道床接地位置备注1DK76000DK76055DK760052DK76055DK76155DK761053DK76155DK76255DK762054DK76255DK76355DK763055DK76355DK76455DK764056DK76455DK76555DK765057DK76555DK76655DK766058DK76655DK76755DK767059DK76755DK76855DK7680510DK76855DK76955DK7690511DK76955DK77055DK7700512DK77055DK77155DK7710513DK77155DK77255DK7720514DK77255DK77355DK7730515DK77355DK77455DK7740516DK77455DK77555DK7750517DK77555DK77655DK7760518DK77655DK77755DK7770519DK77755DK77855DK7780520DK77855DK77955DK7790521DK77955DK78055DK7800522DK78055DK78155DK7810523DK78155DK78255DK7820524DK78255DK78355DK7830525DK78355DK78455DK7840526DK78455DK78555DK7850527DK78555DK78655DK7860528DK78655DK78755DK7870529DK78755DK78855DK7880530DK78855DK78955DK7890531DK78955DK79055DK7900532DK79055DK79155DK7910533DK79155DK79255DK7920534DK79255DK79355DK7930535DK79355DK79455DK7940536DK79455DK79555DK7950537DK79555DK79655DK7960538DK79655DK79755DK7970539DK79755DK79855DK7980540DK79855DK79955DK7990541DK79955DK80055DK8000542DK80055DK80155DK8010543DK80155DK80255DK8020544DK80255DK80355DK8030545DK80355DK80455DK8040546DK80455DK80555DK8050547DK80555DK80655DK8060548DK80655DK80755DK8070549DK80755DK80855DK8080550DK80855DK80955DK8090551DK80955DK81055DK8100552DK81055DK81155DK8110553DK81155DK81255DK8120554DK81255DK81355DK8130555DK81355DK81455DK8140556DK81455DK81555DK8150557DK81555DK81655DK8160558DK81655DK81702.75DK81679施工时，若接地单元中单元道床板起始里程和终止里程与上表中里程不符，可以适当调整上表中的位置与单元道床里程一致，但每个接地单元中部设置的不锈钢接线端子与道床接地位置必须一致。每个接地单元中部设置的不锈钢接地端子与已预留的道床板接地扁钢之间用不锈钢连接钢缆连接，形成一个完整的接地单元。不锈钢连接钢缆和预留的道床接地扁钢之间的焊接必须牢固，满足焊接要求。施工时，不锈钢接线端子必须露出道床板顶面5mm。2. 焊接方式纵向接地钢筋与横向接地钢筋之间交叉处采用焊接方式进行连接，焊接长度单面焊100mm，双面焊55mm，焊缝高度h4mm；具体焊接要求见下图：二、 绝缘每个单元道床板内，除上层三根纵向接地钢筋和一根横向钢筋相交处采用焊接外，其余各钢筋之间均采用绝缘卡连接，各钢筋之间不得直接接触。每个不锈钢接线端子均只与线路左侧上层外侧的一根纵向接地钢筋焊接，不得与其他钢筋接触。每个接地单元内的单元道床板之间，在线左相邻不锈钢接线端子之间用不锈钢连接钢缆连接，不锈钢连接钢缆不得与其他钢筋接触。每个接地单元之间不连接，各自形成一个独立的接地单元，与线路左侧贯通扁钢连接。