Construction method of underground building pipe pile group foundation

The invention discloses an underground building pipe pile group foundation construction method which comprises the following steps: S1, foundation construction preparation including technical preparation, construction site preparation, pipe pile positioning preparation and soil layer treatment; s2, according to the pipe piles at different positions, pipe sinking cast-in-place piles, drilling cast-in-place piles and hole digging cast-in-place piles are selected; s3, forming holes in the positions of the cast-in-place piles; and S4, steel bars are bundled in the holes formed in the step S3, a formwork is poured, and concrete pouring forming is conducted. According to the distribution of the underground pipe pile group and the environment and the position of the corresponding position of the pipe pile, a reasonable pile filling method is selected, in the pile filling process, by setting the technical parameters of the pipe pile, different pile filling modes are adopted for the filling pile in different places, t