The invention provides a self-circulating posterior grouting bored
pile construction method. The construction method comprises the steps of (1) determining the
pile position and locating a drilling
machine (5), (2) arranging a mud self-circulation facility, (3) boring and primary bore clearing, (4) fabricating a steel reinforcement cage, a sounding
pipe and a grouting
pipe, (4) placing the steel reinforcement cage, the sounding
pipe and the grouting pipe, (5) mounting a guide pipe, (7) secondary bore clearing and mounting a waterproof hydrant, (8) pouring concrete, and (9) grouting under a
high pressure. According to the self-circulating posterior grouting bored
pile construction method, the supporting facilities such as a mud
settling basin for recovering and recycling mud are arranged in the construction site, so that the
land resources and the
water resources can be effectively saved, the
pollution of the mud to the environment can be greatly reduced, and the environment can be protected; meanwhile, the construction cost is reduced; furthermore, the
bearing capacity of the foundation pile can be effectively improved by about 30%, and therefore, under the circumstance of the certain load of the foundation pile, the
diameter of the foundation pile can be accordingly reduced, the construction investment can be saved and the economic benefit can be further increased.