在房屋施工中的防雷施工的方法有哪些?

2025-03-27 15:50:37
推荐回答(1个)
回答1:

1、依据“国标GB50057-94防雷设计规范要求”,本工程按二类防雷建筑设防。
2、在屋面,女儿墙上均设-25×4镀锌扁钢;避雷带与作为引下线的柱内主筋、柱内主筋与作为接地极的基础钢筋网均可靠焊接。所有伸出屋面外的金属构件、建筑物的所有金属管道均应接地装置可靠焊接。
3、避雷带引下线利用柱内两对角主筋,被利用主筋从下到上焊接,一直焊到天面,每层楼中间加以箍筋。在每根作为防雷引下线柱子或剪力墙的外侧预埋一块100×100×10钢板,作为测量接地电阻及连接人工接地体之用。钢板中心标高0.3米,钢板与作为防雷引下线的柱内主筋焊成电气通路(不少于两点)。
4、利用天面板筋组成网格(12m×7.5m),被利用板筋应互焊连通并与避雷带引下线焊接连通。利用承台,地梁内两条主筋作为水平接地体,把垂直、水平接地体连通并在+0.5m处组成环形接地体,每根引下线所连接的钢筋表面积为S≥4.24Kc2。
5、利用桩内引下线的二条对角主筋作为垂直接地体。从30m起每层设均压环(利用圈梁内二条主筋连成水平闭合圈,并与所有防雷引下线连接)。将各层金属构件及金属门窗与均压环连接。
6、采用联合接地体利用基础钢筋,桩基钢筋之间应用φ12的镀锌圆钢焊接成纵向横向闭合网。接地电阻R不大于1欧姆,实测如达不到要求值应增打人工接地装置。
7、天面的金属物均应与避雷带连接,连接处不少于两处,用电设备的金属外壳应采用单点接地,通过保护线(PE)与接地点连接,各建筑物整个系统的中性线(N)与保护线(PE)是分开的,在总配电房需进行等电位联结。
8、全部金属材料必须牢固焊接,焊接处须作防锈处理,自来水入户主干管,户外电缆金属护套及其他地下金属构件均应与外环形接地体连接。
9、本工程采用接零保护,电器、设备的不带电金属外壳及插座专用接零孔应可靠进行等电位连接,本工程采用专用线路做保护接零保护线,穿线用金属管及金属线槽均应可靠接零。
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