Support jacking and main keel connecting structure for cast-in-place special-shaped fish-bellied box girder

A support jacking and main keel connecting structure for a cast-in-place special-shaped fish-bellied box girder is used for solving the technical problem of stable connection between a steel main keel and a jacking mentioned in the background technology and comprises the U-shaped jacking, two opposite vertical plates and the main keel, the two vertical plates are both arranged in the jacking, and the two vertical plates are arranged in the U-shaped jacking. The two vertical plates are parallel to the side walls of the two sides of the jacking and abut against the side walls of the two sides of the jacking in a one-to-one correspondence mode, each vertical plate is detachably connected with the corresponding side wall of the jacking through a first connecting piece, and the main keel is arranged between the two vertical plates. The connecting structure of the top support and the main keel is simple in structure and convenient to disassemble and assemble, and is mainly used for connection between the top suppor