PURPOSE: To suck up a large quantity of water simply by injecting pressure water in the suck-up direction and the central direction from a circumferential surface on the midway of a pipe while air is flowed in at the suction side when the muddy water is sucked up by using the pipe.

CONSTITUTION: The pipe 12 is positioned into the muddy water 11 in a shaft 10, air is flowed in by means of an air inflow machine 13 consisting of a compressor or a blower at the suction side of the pipe 12, and the muddy water and air are injected by means of a pump 15 continuously mounted to the circumferential surface 14 from the circumferential surface 14 on the midway of the pipe 12, and the muddy water is pumped up.