Abstract: A groundwater pumping apparatus includes an outer tube, an inner tube, a shield member, a vacuum unit and a pump unit. The outer tube is buried in ground, and has a water-passing portion at its lower part. The inner tube has a substantially same length as the outer tube, and is placed in the outer tube such that the inner tube is spaced from the outer tube. The inner tube has a groundwater inlet at its bottom end, which is provided at a position lower than a top end of the water-passing portion. The shield member shields top ends of the outer tube and the inner tube. The vacuum unit reduces a pressure in the inner tube. The pump unit pumps groundwater that comes in the inner tube through the groundwater inlet.

Abstract: A groundwater pumping apparatus, which has the capability of effectively performing a groundwater collecting/pumping operation with a relatively simple configuration, and making the effective use of an existing deep-well apparatus, is provided. This apparatus has an outer tube buried in ground, and an inner tube having substantially a same length as the outer tube and placed in the outer tube so as to be spaced from the outer tube. The outer tube has a water-passing portion at its lower part, and the inner tube has a groundwater inlet at its bottom end. The groundwater inlet is placed at a position lower than a top end of the water-passing portion. The apparatus also comprises a shield member for shielding top ends of the outer tube and the inner tube, a vacuum unit for reducing a pressure in the inner tube, and a pump for pumping groundwater that comes in the inner tube through the groundwater inlet.