Steel box girder mid-span continuous section ultra-long span integral lifting construction method

A super-long span integral lifting construction method for a midspan continuous section of a steel box girder comprises the construction steps that firstly, segment division design is carried out on a full-bridge steel box girder, the length of a steel box girder segment of the midspan integral lifting section is smaller than the designed span length of a midspan, and a structure that a girder body of two side spans is in a cantilever structure from the pier top to the midspan is formed; 2, through accurate simulation calculation, deformation and stress influences are eliminated; thirdly, side span temporary supports are installed, and side span beam bodies are hoisted; fourthly, a pier top cantilever section lifting device is installed; step 5, arranging a pedestal and assembling a steel box girder; sixthly, the pier top cantilever section lifting device is connected with the lifting point anchoring structure; seventhly, hoisting is conducted after a lifting system is debugged; 8, after lifting in place, clo