Bearing platform construction method

The invention relates to the technical field of civil engineering construction, in particular to a bearing platform construction method. The bearing platform construction method comprises the following steps that an isolation layer is arranged on the well wall of a bearing platform pouring section in a well hole of an open caisson; and a bearing platform is poured on the inner side of the isolating layer to the steel pipe column. A step platform is arranged at the position of a well opening of the well hole and is in a step shape, the bearing platform pouring section comprises an upper half section located above the step platform and a lower half section located below the step platform, and isolation layers are arranged on the well wall of the bearing platform pouring section in the well hole and comprise the steps that an upper isolation layer is arranged on the well wall corresponding to the upper half section, and a lower isolation layer is arranged on the well wall corresponding to the lower half section.