Prevent to push up slideway structure of case body off normal

The utility model belongs to the technical field of under wear grade separation bridge engineering design and construction and specifically relates to a prevent to push up slideway structure of case body off normal, its characterized in that: slideway structure includes at least one steel caisson that has open -top, the steel caisson sink below the work base hole bottom plate that case body top advances and its top surface with the surperficial looks parallel and level of work base hole bottom plate, the steel sink cargo position in the front end of work base hole bottom plate, the inside of steel caisson is passed through open -top has filled the obturator just open -top binds through a steel sheet, the bottom of steel caisson is cast -in -place to have the back cover concrete, the case in the top is advanced on the steel caisson top surface, the steel caisson is arranged in preventing case reciprocating in jacking -into process. The utility model has the advantages that: can effectively prevent case off nor