DRAINAGE DEVICE Russian patent published in 1998 - IPC

FIELD: construction engineering. SUBSTANCE: this relates to devices intended for protection from ground water and particularly to drainage devices. For purpose of reducing labour-intensity in building of drainage device, its wall is made up of sheet piles. Upper and lower parts of sheet piles are made of dense concrete, middle part of sheet piles is made of porous concrete. Located between lower part and middle part of sheet piles is horizontal slot which creates through-flow discharge passage in wall. EFFECT: higher efficiency. 2 dwg