METHOD FOR EXCAVATING HOLE HAVING DIAMETER-ENLARGED PART, AND METHOD FOR CONSTRUCTING WELL HAVING DIAMETER-ENLARGED PART

摘要

PROBLEM TO BE SOLVED: To provide a method that enables a hole with a diameter-enlarged part to be excavated on a narrow site.SOLUTION: In a method for excavating a hole 20 with a diameter-enlarged part 22 having a diameter partially enlarged, the diameter-enlarged part 22 is excavated by emitting a jet of a stable liquid in a crosswise direction from a high-pressure injection nozzle 66 while rotating the high-pressure injection nozzle 66 in the state of inserting it into the hole 20.