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为解决野外施工钻机的避雷问题,我们制做了适于钻机现场用的避雷设施,现简介如下. 避雷装置由避雷针、导线和接地体三部分组成. 自制的避雷针全长2米,上部为长1米、直径25毫米的铜棒;下部是长1米、直径1.2英寸的有缝铁管,中间用气焊焊接而成.针头锻成45°锥角,针体尾部150毫米长锻扁,上面钻3个固定孔,以作为与木梁固定和接引下线之用(图1). 导线(引下线)是用来传递雷电的,选用截
In order to solve the problem of lightning protection for field construction drilling rigs, we made lightning protection facilities suitable for use on the site of drilling rigs. Now we introduce them as follows. The lightning protection device consists of three parts: the lightning rod, the wire, and the grounding body. The homemade lightning rod has a total length of 2 meters and the upper part is long. 1 m, 25 mm diameter copper rod; the lower is a 1 m long, 1.2 inch diameter slotted iron tube, made by gas welding. The needle is forged into a 45° taper angle, and the tip of the needle is 150 mm long and forged flat. Drill 3 fixing holes for fixing and connecting with the wooden beam (Figure 1). The wire (lead wire) is used to transmit lightning, select the cut