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轻钢房屋接闪器及引地下线的作用

2015-11-09

核心提示:根据轻钢结构建筑物的特点,高大沉重的避雷针不适合在轻钢房屋等建筑物上安装,根据建筑物防雷规定针对金属板下面有无易燃品的不同情况,对金属板的厚度做了不同的要求,明确规定金属板下面无易燃品时,其厚度不应小于0.5毫米。避雷带网格大小应该按规范的要求和各类建筑物的防雷类别严格对应,施工图纸应当按规范划分的标准准确标注。 从结构专业角度出发,屋面板的厚度选择一般考虑三个因素:第一是风荷载;第二是雪荷载;第三是檩距。所以,不同地域可能所选的屋面板厚度就不一样,电气设计人员需要和结构专业及时沟通,厚度满足规范要求时,再考核其他条件。 从前面轻钢结构建筑物的建筑体系的介绍可以看出,主钢架、次构件、围护系统在施工中已经作了可靠的连接,形成了持久的电气通路。因此,只要设置了可靠的接地装置,就可以按跨度将钢柱作为引下线。当然,规范对各类防雷建筑物的引下线间距做了要求,不过在土建施工时,只要所有的钢柱和接闪器、接地装置做了可靠连接,那么它们都是引下线,实际效果超过了规范的标准。 轻钢房屋引地下线的好处: 第一,不用担心钢柱容易受到机械损坏; 第二,从轻钢结构的建筑体系看,距地有1.2m高的砖墙或者加气混凝土砌块,对人身接触有一定的防护; 第三,钢柱本身做了防腐处理,含绝缘被覆层,也起到一定的防护作用。

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