Inner cavity type prefabricated segment assembled pier top cross beam and construction method thereof

The invention discloses an inner cavity type prefabricated segment assembly pier top beam and a construction method thereof.A pier top beam top plate is divided into a first top plate and a second top plate, the second top plate is located in the middle of the first top plate, a bottom plate is divided into a first bottom plate and a second bottom plate, and the second bottom plate is located in the middle of the first bottom plate; the web plates are divided into a first web plate and a second web plate which are attached to each other, the pier top cross beam structure comprises a shell and an inner cavity part, the shell comprises a first top plate, a first bottom plate, the first web plate and a flange plate, and the shell is a prefabricated reinforced concrete member; the inner cavity part comprises a second top plate, a second bottom plate and a second web plate and is of a cast-in-place reinforced concrete structure. The prefabricated shell is light and thin in size, compared with a prefabricated pier