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水文地质钻探和水井钻进施工的成败,合理选用滤水管极为重要。目前,普遍采用的滤水管(包括条孔式钢制滤水管)在用泵抽水时,地下水携带出来的各种规格的砂粒,往往会堵塞滤眼。即便在投砾的滤水管中,也是如此。在抽水中出现砂粒堵塞,经常造成事故,潜水泵损坏频繁,抽水初期滤水管埋堵,沉砂池中砂子堆积过多等。这类事故,使抽水工作蒙受巨大损失,修井困难,费时又费钱。为此,在各工业发达国家,近些年来陆续出现了多种形式的结构先进的滤水管,其中之一是贴砾滤水管。
The success of hydrogeological drilling and well drilling is very important. At present, the commonly used water filtering pipes (including bar-hole type steel water filtering pipes), when pumping water, various kinds of sand carried by groundwater often clog the filter eyes. This is true even in cast pipes. Occurrence of sand plugs in the pumping water often causes accidents, frequent damage to the submersible pump, plugging of the water filter in the initial stage of pumping, and excessive sand accumulation in the grit chamber. Such accidents have caused huge losses in the pumping work. Difficulties in repairing wells have taken time and money. For this reason, in various industrialized countries, in recent years, various types of structurally advanced water filtration pipes have emerged one after another, one of which is a pebble filter pipe.