LEVEL OF UNDERGROUND WATER LOWERING METHOD AND DEEP WELL POINT SYSTEM THEREOF

摘要

The present invention provides an underground water level reduction method capable of pumping up to groundwater exceeding depth of 5 m with one well point and a well point suitable therefor. The outer casing is provided with a ball valve at the bottom and a packer at the outer circumference thereof, the center thereof. An inner casing composed of an inner casing concentrically disposed in the circulation casing to form a circulation passage and a suction passage, and a venturi tube received at a lower portion of the outer casing and having a wide inlet and a narrow outlet, perpendicular to the surface of the inner casing Supply the pressure water to the center side suction passage of the water jet through the water jet passage discharged to the lower end of the outer casing from the surface to the planned depth, and the upper side of the inner outer casing through the supply side conduit and the drain side conduit, respectively. The supply side header and the drain side header are in communication with each other and the packer is inflated to It is interposed between the outer casing and the outer casing, and supplies the pressure water generated in the feed pump disposed between the supply side header and the drain side header through the circulation passage of the outer casing and passes through the venturi tube, around the lower negative pressure passage of the inner casing. The vacuum is made to allow the groundwater penetrated into the lower portion of the outer casing to be pumped through the suction passage of the inner casing.;Well point, groundwater pumping, water level reduction method,