Sand pile water drainage dynamic compaction post-grouting foundation reinforcement structure

The utility model discloses a sand pile water drainage dynamic compaction post-grouting foundation reinforcement structure. The sand pile water drainage dynamic compaction post-grouting foundation reinforcement structure is characterized in that a sand pile is arranged in a foundation, a broken stone cushion layer is paved on the top of the sand pile, water drainage channels are dug on two sides of the sand pile, after pre-pressing and dynamic compaction, a vertical water drainage grouting pipe is embedded at the pile position of the sand pile, a horizontal water drainage grouting pipe is also paved in the broken stone cushion layer, bubble concrete is cast at two ends of the broken stone cushion layer, an upper-part embankment structure is arranged on the broken stone cushion layer, after the foundation deformation is stable, the foundation is subjected to grouting by virtue of the water drainage grouting pipe, and high-pressure grouting is implemented at the bottom of a dynamic compaction reinforcement area, a continuous loading plate body is finally formed at the bottom, and the sand pile is grouted into a rigid pile body structure. By adopting the structure disclosed by the utility model, the problems of limited dynamic compaction treatment depth and relatively large post-construction settlement in roadbed and structure construction and after operation can be solved; and the structure has the advantages of high construction speed, relatively-reduced construction cost and the like, and has relatively good technical economic benefits.