Bridge prefabricated foundation and bed-burying method thereof

The invention discloses a bridge prefabricated foundation and a bed-burying method thereof. The bridge prefabricated foundation consists of a bridge lower part pier body, an undercut bearing platform and a cavity formed by enclosing the pier body and the bearing platform. The undercut bearing platform is reserved with a guide hole, an exhausting recharging hole and a supporting liner plate. The bed-burying method comprises the following steps of: integrally prefabricating the lower part pier body and the bearing platform in a factory; excavating a foundation ditch, and then paving a crash padlayer; and sinking a pile which passes through the crash pad layer and is inserted into a sea (or river) bed. A range of 5 to 30 m below a designed height mark of the top of the pile and is filled with core filling concrete, and a supporting pile and a bearing pile are cut to the designed height mark underwater. The prefabricated foundation is positioned through a guide pile, and is placed on thesupporting pile which is p