Construction method of cast-in-situ bored pile suitable for karst cave geology

The invention discloses a construction method of a cast-in-situ bored pile suitable for the karst cave geology. The construction method comprises the following steps that (1), a pile position is measured and positioned; (2), a casing is embedded; (3), a pile machine is in position; (4), rock blocks and yellow mud are backfilled, a hole is bored; (5) first-time hole cleaning is carried out; (6), a steel sleeve and a steel reinforcement cage are machined and fixed; (7), the steel sleeve and the steel reinforcement cage are put into the hole; (8), a guide pipe is arranged, and second-time hole cleaning is carried out; (9), concrete is poured; and (10), shifting is carried out. Compared with a conventional construction method, pile body segregation, foot rotting, pile breaking defects and the like are effectively solved, and pile waste can be prevented; the quality of a pile foundation is obviously improved, and safety of a foundation structure of a house is ensured; and later reinforcing or layer reduction event caused by insufficient bearing capacity of a foundation is avoided.