Hole forming method for construction pile foundation of slope volume gravel soil rotary drilling rig

The invention discloses a pore-forming method for constructing a pile foundation through a slope volume gravel soil rotary drilling rig. The pore-forming method comprises the following steps that (1) a steel floral tube is prepared; 2) construction preparation; (3) surveying and setting out; a measuring instrument is adopted to measure the ground elevation, and the center position of the pile foundation and the position of the steel floral tube to be arranged are measured and determined; (4) arranging steel floral tubes to form steel pipe piles; a drill bit is adopted for drilling at the position where the steel floral tube is to be arranged, water pump flushing is not needed in the drilling process, drilling and lifting are repeated, finally, a hole is formed, and the steel floral tube is inserted into the hole; (5) grouting in the steel pipe pile; prepared slurry is adopted for pressure filling, and it is ensured that the slurry fills the interior of the steel pipe pile and the whole drill hole; and (6) rot