Pile bottom hole clearing system and process of pile bottom hole clearing

The invention relates to a pile-bottom borehole-cleaning system and a pile-bottom borehole-cleaning technique, adopting a direct-reverse circulation-combined borehole cleaning technique for carrying out pile-bottom borehole cleaning. The pile-bottom borehole cleaning system comprises a reverse circulation pump, a mud pump, a valve switch, a pipeline, a mud ditch or a mud pipeline, a sedimentation basin and a conduit; the conduit is communicated with a pipeline at the right side and connected with the reverse circulation pump, the mud pump and a three-way valve switch; the interconversion of the direct-reverse circulation borehole cleaning is realized by controlling the valve switch. Compared with the prior art, the pile-bottom borehole cleaning system and technique can carry out fast slag removal cleanly and thoroughly, thereby increasing the slag removal efficiency by 3 to 5 times, and ensuring the quality of the pile basement; the used borehole cleaning device has simple and functional installment and operation, easily accessible materials, low price and convenient process.