机井是我国北方干旱和半干旱地区农业生产中的主要水利设施、其所用管材基本为水泥砂管机井。这种机井的特点是:施工简单,造价低廉,管材材料充足,出水量较好。目前我国约有这种机井210余万眼。随着机井的增多,相应地出现了一些急待解决的问题,主要表现在机井损坏逐年减多,有的乡村机井下管不久即损坏,严重浪 Well is the main water conservancy facilities in the agricultural production in the arid and semi-arid areas in northern China, and its basic pipe is cement sand tube well. The characteristics of this machine is: simple construction, low cost, adequate pipe material, the amount of water is better. At present, there are about 2.1 million such wells in our country. With the increase in the number of wells, correspondingly there are some urgent problems to be solved, mainly manifested in the damage to the wells decreased year by year, some villages soon underground pipe damage, serious waves