CONSTRUCTION METHOD OF STEEL PIPE PILE

PROBLEM TO BE SOLVED: To provide a method for constructing a steel pipe pile, by which desired strength can be stably obtained.SOLUTION: A steel pipe 8 is press-fitted into the ground until the tip of the steel pipe 8 reaches a bearing layer 115 of the ground; when press-fitting the steel pipe 8 into the ground, sediment in the steel pipe 8 is excavated up to the bearing layer 115; and when excavating the sediment in the steel pipe 8, slurry is supplied into the steel pipe 8 to discharge the excavated sediment produced in the steel pipe 8 together with the slurry out of the steel pipe 8. Excavation of the sediment in the steel pipe 8 is performed by a rotary excavation device 5 comprising a reverse rod 51 and a reverse bit 52 provided at the lower end of the reverse rod 51. When excavating the sediment in the steel pipe 8, the slurry in the steel pipe 8 is sucked by an opening at the lower end 51a of the reverse rod 51, raised in the reverse rod 51, and discharged out of the steel pipe 8. The inside of the tip of the steel pipe 8 which reached the bearing layer 115 of the ground is filled with a foot protection material via the reverse rod 51. After filling the inside of the tip with the foot protection material, the slurry remaining in the steel pipe 8 is discharged out of the steel pipe 8 and the inside of the steel pipe 8 is backfilled with the excavated sediment.