PROCESS OF CONSTRUCTING WELL USING DOUBLE FILTER

摘要

PURPOSE: A process of constructing a well using a double filter is provided to excavate a well by a boring machine and a hydraulic jack in order to obtain underground water filtered by a double filter. CONSTITUTION: The process of constructing a well using a double filter is composed of: vibrating and pressing down an outer casing(1) by a large caliber boring machine and pulling up earth and sand by a hammer grab to excavate a well; inserting an inner casing(2) and a screen(3) provided with a band-shaped spacer(7) used to keep straight and a water supply pipe(4); filling the first filtering material between the inner casing and the outer casing by the method of gravitational filling; filling the second filtering material between the inner casing and the water supply pipe; pulling out the inner casing and the outer casing step by step; spaying air to remove impurities on the screen and sludge in the water supply pipe by an air compressor; constructing a manhole(8) and placing cement mortar to the well.