DEVICE FOR EXCAVATING HOLE FOR INSTALLATION OF LIFTING PIPE FOR PUMP

PROBLEM TO BE SOLVED: To provide a device capable of reducing manpower for excavating a hole for installation of a lifting pipe for a pump in sandy soil. SOLUTION: A water storage tank 2 and a water-jet vacuum pump 9 are fixed to a trestle 1, and a suction rubber hose 12 is arranged between the pump 9 and the tank 2. A discharge rubber hose 16, which is coupled to the pump 9, is inserted into a leading excavating pipe 20 which is pre-erected in the sandy soil and has a weight 25 placed on an upper end via a weight placing plate 24. A pump-up rubber hose 17, which is connected to a top surface of the tank 2 and whose tip part is provided with a digger 19, is inserted into the pipe 20 through the weight 25, so that the digger 19 can reach a lower bottom of the pipe 20. A plurality of extension excavating pipes 23 are provided in a state of being brought into continuous contact with one another upward from the upper end of the pipe 20. Water is circulated through the tank 2, filled with the water, and the pipe 20 by using the pump 9.