UNDERGROUND WATER PUMPING DEVICE, AND UNDERGROUND WATER PUMPING METHOD: Fid-Bau Portal

UNDERGROUND WATER PUMPING DEVICE, AND UNDERGROUND WATER PUMPING METHOD

TOMIYASU YUKI / YAMADA YUKI / YOSHIMOTO KAZUNORI

To provide an underground water pumping device and an underground water pumping method capable of adjusting a pumping amount of underground water.SOLUTION: An underground water pumping device comprises: a casing main body which is installed in a subsoil of an area to be excavated and whose inside is vertically divided by a partition plate having a water passing hole; a flow rate adjusting mechanism provided on an upper face of the partition plate so as to cover the water passing hole; and a submerged pump disposed in an upper space of the casing main body. In the casing main body, there is provided an upper strainer making underground water flow into the upper space from a water-bearing layer above a low-permeable layer, and there is provided a lower strainer making underground water flow into a lower space from a water-bearing layer below the low-permeable layer. The flow rate adjusting mechanism comprises: a rising pipe erected so as to surround the water passing hole; and a water passing pipe engaged with the rising pipe so as to ascend/descend. As to the water passing pipe, its upper end portion is closed, and a flow rate adjusting port is formed on a side face, whose opening height is larger than an opening width.SELECTED DRAWING: Figure 3

【課題】地下水の揚水量を調整することの可能な、地下水揚水装置及び地下水の揚水方法を提供する。【解決手段】掘削対象領域の地盤中に設置され、通水孔を有する間仕切り板で内方を上下に仕切られたケーシング本体と、間仕切り板の上面に通水孔を塞ぐように設けられる流量調整機構と、ケーシング本体の上部空間に配置される水中ポンプと、を備える地下水揚水装置であって、ケーシング本体は、上部空間に難透水層より上方の帯水層から地下水を流入させる上部ストレーナーが設けられるとともに、下部空間に難透水層の下方の帯水層から地下水を流入させる下部ストレーナーが設けられ、流量調整機構は、通水孔を囲うように立設される立上がり管と、立上がり管に昇降自在に嵌合される通水管と、を備え、通水管は、上端部が閉塞され、側面に開口幅に対して開口高さが大きい流量調整口が形成されている。【選択図】図３

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