The invention relates to a construction process for a bored
pile close to a flood wall through a
riprap layer. A bent frame is lapped close to the side of a flood wall and erected above the flood wall to form a drilling platform, and a
pile driver is placed on the bent frame for construction; and the concrete process flow is as follows: firstly, obstacle clearing and outer shielding canister burying; secondly, inner shielding canister burying; thirdly, drilling
machine replacing for continuous drilling; fourthly, hole cleaning, fifthly, reinforcement cage hanging; sixthly,
underwater concreting; and lastly, inner shielding canister pulling. The construction process solves the problems of obstacle clearing, hole forming and stability of hole wall of the bored
pile in the thick
riprap layer by combining the inner sleeve and the outer sleeve; the
geotextile is arranged on the inner side of the sleeve of the full-rotating drilling
machine for recycling the outer shielding canister, therefore, the construction process has a certain economical efficiency, and the
underwater concreting is carried out when the Huangpu River is in high
water level to ensure the
slurry return for the bored pile close to the flood wall by the Huangpu River and to ensure the smooth construction of the pile foundation and the quality of the pile body of the bored pile close to the flood wall by the Huangpu River.