Prefabricated combined assembly type ballast bed

The utility model discloses a prefabricated combined assembly type ballast bed, and belongs to the field of vibration and noise control of rail transit. The combined plate comprises a prefabricated track plate, a supporting element and a prefabricated base plate, the prefabricated track plate, the supporting element and the prefabricated base plate are assembled and combined in advance to form a combined plate unit, and an elastic limiting device is arranged between the prefabricated track plate and the prefabricated base plate in the combined plate unit. The elastic limiting device comprises a limiting column and a limiting hole which are correspondingly arranged on the prefabricated base plate and the prefabricated track plate, the limiting column is embedded in the limiting hole, the vertical section contours of the limiting hole and the limiting column are trapezoidal, and an elastic limiting layer is further arranged between the limiting column and the limiting hole. In conclusion, the prefabricated comb