The invention provides a secondary hole cleaning device and method of the bottom of a cast-in-situ bored
pile. The secondary hole cleaning device comprises an annular
nozzle, a water guide
pipe, a pump, a medium tank, an
air compressor and an air
pipe; the air
pipe and the water guide pipe are fixedly connected with a reinforcement cage along the length direction of the reinforcement cage; one end of the air pipe is connected with the
air compressor; the other end of the air pipe is inserted into the bottom of a bore hole; one end of the pump is connected with the medium tank; the other end of the pump is connected with one end of the water guide pipe; the other end of the water guide pipe is connected with the annual
nozzle which is fixed at the bottom of the reinforcement cage. According to the secondary hole cleaning device and method of the bottom of the cast-in-situ bored
pile, the working principle of
underwater concrete
casting is utilized, the technical method that
sediment cannot be produced at the bottom of the bore hole before first concrete is cast is adopted, and accordingly
sediment is not produced at the bottom of the cast-in-situ bored
pile in the end and the concept that
slurry needs to be replaced in the former secondary hole cleaning is changed; the problem that a
waiting time is required to form the
sediment from the secondary hole cleaning to the concrete
casting formerly is solved; the quality of the cast concrete pile is easy to guarantee.