Large-adjustment-amount ballastless track bed and construction method thereof

The invention relates to a large-adjustment-amount ballastless track bed and a construction method thereof. After an existing ballastless track is poured and formed, when the deformation amount of a foundation exceeds the adjusting capacity of a fastener, adjustment needs to be conducted through special means such as inverted arch cutting, plate uncovering and groove expanding and soil digging forced landing. The device comprises a prefabricated track plate, a fine aggregate concrete adjusting layer and an adjusting block; a vertical hole is formed in the middle of the prefabricated track plate, and the fine aggregate concrete adjusting layer is located in the hole and at the bottom of the prefabricated track plate. The adjusting blocks are located on the two transverse sides of the open hole, the tops of the adjusting blocks are fixed to the prefabricated track plate, and the lower portions of the adjusting blocks are located between the fine aggregate concrete adjusting layer and the prefabricated track pla