管井外围的填料层结构,是确定不同含水层中过滤器构造型式的关键。多年来,人们多注意于以镀锌铁丝为主的缠丝过滤器或包网过滤器的锈蚀、漏砂与堵塞问题,而忽视填料层结构及与之直接相关的过滤器构造型式的变革。结果不但难以从根本上解决问题,往往又产生一些新的矛盾,诸如:加工 The filler layer structure around the tube well is the key to determining the type of filter configuration in different aquifers. Over the years, people have been paying more attention to the problem of rust, sand leakage, and plugging of the entwined wire filter or the purse filter, while ignoring the reform of the filler layer structure and the filter structure directly related to it. The result is not only difficult to fundamentally solve the problem, but often leads to some new conflicts, such as: processing