Prefabricated pier column and bearing platform connecting structure and construction method

The invention discloses a prefabricated pier column and bearing platform connecting structure and a construction method. The structure comprises a stand column and a bearing platform, wherein the stand column comprises a section increasing section and a standard section, and the size of the cross section of the section increasing section is larger than that of the standard section; a plurality ofstand column steel bars and corrugated pipes are arranged on the circumference in the stand column and on the circumference in the section increasing section respectively, the corrugated pipes are located between the inner surface of the section increasing section and the stand column steel bars and close to the stand column steel bars, and threaded anchor heads are arranged at the bottom ends, which are close to the bearing platform, of the stand column steel bars; a grouting hole is formed in the lower part of the corrugated pipe, and an upper opening of the corrugated pipe is exposed in airas a grout outlet; inner-