Recently, with the slogan of "drop the beam in place", the last box girder within the scope of the 4th section of the Hanba South Railway, which was constructed by China Railway 18th Bureau Group Second Company, landed smoothly and accurately in Longjia. On the pier of the Longwan Bridge. It marks the successful completion of the erection of 281 box girders within the scope of the 4th bid section of the Hanbanan Railway Project, laying a solid foundation for the subsequent construction of ballastless tracks.