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jing yu ji qi fang zhi
Author(s): 
Pages: 11-12
Year: Issue:  10
Journal: Farm Machinery

Keyword:  缠丝滤水管排列位置净间距成品管花管井管不合格含水层厚度水泥管;
Abstract: <正>井淤的原因一、滤水管(花管)结构1.滤水管的进水孔径小、数量少,所以管壁进水面积也较小,进水流速增大,就易涌沙。2.滤水管缠丝净间距不合格(过大),未按实际含水层颗粒大小的要求确定。自制水泥管,手工缠丝,丝间距很难保证均匀一致;外购的成品管丝间距则能满足一般地层含水层颗粒的要求,实际上很难对每个井都适用。3.滤水管缠丝垫筋少、直径小,缠丝紧贴井管。4.水泥滤水管外包扎棕皮太薄,铅丝捆扎较稀。5.滤水管在井内排列位置不当:(1)错入易涌沙地层;(2)错排在亚沙土层等;(3)滤水管数量较多,多余部分处
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