PURPOSE: To improve the workability and reduce the cost of sand-removing work by blowing up joint sand with water jet ejected from a nozzle, scooping the blown sand with a scooping member and transferring into a sand-container.

CONSTITUTION: Water is ejected through each nozzle 10 by driving an engine 4 and rotating a pump. Since the water jet has a certain angle between the ground, the sand in the joint part is blown up. The joint sand and water blown up into a machine frame are guided along a scooping member 11 and charged into a container 12 by forwarding the machine frame 1 keeping the above state. The sand stored in the container 12 is discharged on demand from the top opening 17 at the back of the machine frame 1 and the water is transferred through a suction port 13 to a tank 7 and circulated to the nozzle 10 with the pump 6.