Prefabricated tubular pile structure with built-in high-expansion material self-expanding pile shoe

The utility model discloses a prefabricated pipe pile structure with a built-in high-expansion material self-expanding pile shoe, and belongs to the field of construction equipment. The self-expanding pile shoe is arranged at the bottom of the prefabricated pipe pile, the groove cavities filled with the expanding materials are evenly formed in the peripheral face of the pile shoe body in the self-expanding pile shoe in the circumferential direction, and meanwhile the diameter-expandable annular plate is hinged to the peripheral face of the pile shoe body. The expanding annular plate is expanded according to the principle that a high-expansion material expands when meeting water, so that expanding is achieved, and finally the expanding head structure in the shape of an inverted circular truncated cone is formed. And meanwhile, grouting slurry is further filled into the diameter-expandable annular plate through the pre-buried pipeline, after the grouting slurry is solidified, radial support for the diameter-exp