Abstract: An underground continuous impervious wall is disclosed, which includes an impervious sheet which partitions a gutter and prevents water from passing through the wall. The gutter is formed in the ground such that it has a small width. The impervious sheet is lowered into the gutter to partition the gutter in the width direction. A hardening material is charged against the opposite side surface of the impervious sheet in the gutter and solidified, whereby an impervious wall with the impervious sheet intervening between opposite side wall portions is obtained. The impervious sheet is disposed in the gutter by lowering the sheet in a state of roll or lowering the sheet in a state stretched on posts or lowering the sheet in a state accommodated in a sheet cartridge. Adjacent sheets are connected to each other by female and male hooks.

Abstract: An underground continuous water-impervious wall is disclosed, which includes a water-impervious membrane to partition a trench and to prevent water from passing through the wall. The trench as formed in the ground has a narrow width. The impervious sheet is lowered into the trench to partition the trench longitudinally. A hardening material is charged against the opposite side surfaces of the impervious sheet in the trench and solidified, whereby a water-impervious wall is obtained, with the impervious sheet sandwiched between opposite side wall portions. The impervious sheet is disposed in the trench by lowering the sheet in the form of a roll, lowering the sheet pre-stretched between posts, or lowering a pleated sheet pre-packed in a sheet cartridge. Adjacent sheets are connected to each other by female and male fasteners.