| 摘要 |
PURPOSE: An extraction well system is provided to extract contaminated underground water from contaminated soil bed such as landfill site via perforated drain pipeline having high resistance against earth pressure. CONSTITUTION: In a water collecting tube(15) where a pump(18) and an air supplier(19) are respectively connected by a pipe in a waste treating place, the extraction well is constituted by fixing an inner side pipe(12) and an outer side pipe(11) on an assembly stand(22). The inner side pipe and the outer side pipe are constituted by (a) after intermittently unifying a regular space formed by inserting the inner side pipe into the outer side pipe by an adhesion support, filling the regular space fixed by constituting a supplying hole(14) with a cement mortar or a soft foam(23) with dividing the supplying hole into a drainage way(13) by inserting a partitioning wall(25) on the inner space of the inner side pipe and intermittently perforating a drainage hole(16).
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