Plastic pipe sleeve concrete pile with changeable diameter

The utility model discloses a plastic pipe sleeve concrete pile capable of changing the diameter. The plastic pipe sleeve concrete pile comprises a double-wall plastic sleeve, a single-wall plastic sleeve, an arc-shaped hook device, a limiting device a and a limiting device b. One end of the double-wall plastic sleeve is fixed with the single-wall plastic sleeve, and the other end of the double-wall plastic sleeve is provided with a groove matched with the single-wall plastic sleeve; the single-wall plastic sleeve is inserted into the groove; the arc-shaped hook device is fixedly mounted at the end part of the single-wall plastic sleeve; the limiting device a and the limiting device b are both arranged on the inner wall of the groove of the double-wall plastic sleeve, and the limiting device a is located on the inner side of the limiting device b; the limiting device a is a protrusion, and the limiting device b is a hook with a groove and is matched with the arc-shaped hook device. The initial bearing capacit