Drainage pressure reduction type cast-in-place concrete pile structure

The utility model discloses a drainage pressure reduction type cast-in-place concrete pile structure, which belongs to the technical field of foundation pits and sheet pile wharfs and comprises a reinforcement cage, a drainage system and concrete. The drainage system comprises a plurality of water permeable pipes and sounding pipes, the water permeable pipes are vertically and annularly arranged on the inner side wall of the reinforcement cage respectively, and the water permeable pipes are hollow pipe rings with holes in the surfaces; the sounding pipes are uniformly arranged on the inner wall of the reinforcement cage, and the two ends of the sounding pipes are respectively communicated and fixed with the two water permeable pipes which are arranged on the inner wall of the reinforcement cage and are farthest, and are communicated with all the water permeable pipes; and the concrete is poured in the reinforcement cage to form a cast-in-place pile structure. The cast-in-place pile drainage device is simple i