PHC tubular pile with pre-embedded steel bar-FRP double-layer reinforcement cage and preparation method of PHC tubular pile

The invention discloses a PHC tubular pile with a pre-embedded steel bar-FRP double-layer reinforcement cage and a preparation method of the PHC tubular pile, and belongs to the technical field of civil engineering. The PHC tubular pile comprises a high-strength concrete pile body with a cavity, wherein a FRP pipe is fixedly arranged on the outer surface of the high-strength concrete pile body in a sleeving mode, and the steel bar-FRP double-layer reinforcement cage is arranged in the high-strength concrete pile body. The method comprises the following steps that the FRP reinforcement cage is manufactured; a prestressed steel bar cage and the FRP reinforcement cage are bound or welded to form a steel bar-FRP double-layer reinforcement cage, the FRP pipe is positioned, and the steel bar-FRP double-layer reinforcement cage is placed in the FRP pipe; a cylindrical mold is supported on the inner side of the steel bar-FRP double-layer reinforcement cage, high-strength concrete is poured between the cylindrical mol