Circulating grouting device and method for prefabricated cover beam of fabricated bridge

The invention relates to an assembly type bridge prefabricated cover beam circulating mud jacking device and method, the device comprises a mud jacking mechanism and a circulating mud jacking mechanism, the mud jacking mechanism comprises a mud jacking machine, and the mud jacking machine is provided with a mud outlet and a mud return port; the circulating mud jacking mechanism comprises a plurality of mud jacking units, each mud jacking unit comprises a plugging cover, a hose and a hard pipe fitting, a hard pipe opening and a hose opening are formed in each plugging cover, one end of each hose is fixed to the top face of the corresponding plugging cover and communicated with the corresponding hose opening, and one end of each hard pipe fitting is fixed to the bottom face of the corresponding plugging cover and communicated with the corresponding hard pipe opening. When the plugging cover covers the opening of the corrugated pipe of the prefabricated cover beam, the hard pipe fitting is located in the corruga