To improve a water shielding effect at a low work cost and enable an easy removal at the unnecessary time by fitting a pair of specified water shielding sheets in an excavated groove formed in the depth direction of water containing layer underground, and charging a filler between the sheet.
An underground water shield wall A for preventing leakage of underground water to the ground or open exavation part underground, prevention of dispersion of contaminated underground water and forming a water shield wall of undergroud dum which shields underground water, is composed of an excavation groove 1, water shield sheets, and filler 3. The groove 1 is excavated and formed in the depth direction such that a water containing layer 5 underground is formed with a specified width at a specified length with respect to the ground 4. The paired sheets 2 made of polymer excellent in shock resistant and tear reresistant characteristics are fitted in the groove 1 while abutting against both inner wall surfaces thereof under the conditions that the bottom parts thereof are connected (in the form of pair, i.e., double layer). A filler such as bentonite is charged into between the paired sheets 2 to press the outer surface of the sheet 2 to the inner wall of the groove 1. If required reinforcement is applied to the inside.
TAKEKUMA HIROYUKI
IWAMOTO KENZO
MITSUBOSHI BELTING LTD
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