Water sealing device for temporarily sealing drainage pump mounting hole in pump room and construction method

The invention relates to the field of dock building construction, and discloses a water sealing device for temporary plugging of a pump house drainage pump mounting hole and a construction method.The water sealing device comprises an annular sealing foundation plate, an annular water stop flange is arranged on the lower surface of the sealing foundation plate, and the sealing foundation plate is poured to the top of an annular base table; the sealing cover water sealing plate is arranged on the sealing foundation plate in a covering mode, and the upper side and the lower side of the sealing cover water sealing plate are each provided with a sealing cover annular flange; the two sealing cover annular flanges and the sealing cover water sealing plate are further provided with a plurality of vertical tension bolt through holes. And the tensioning piece is positioned in the mounting hole and is used for hooking a stress surface at the bottom of the concrete. According to the method, damage to a primary concrete s