The utility model belongs to the equipment field is used in the wet seam construction of public road bridge roof beam, discloses a wet seam construction of public road bridge roof beam is with foldable external basket, is provided with foldable operation platform, foldable operation platform is through passing through hinge structure and escape way structural connection, the escape way structure is provided with four stands, four stands pass through hinge structure and connect on two girders of foldable operation platform, connect through the horizontal pole of joint on the stand between the adjacent stand, foldable operation platform, four outer equal bolts of stand have the protection network. The utility model discloses escape way about setting up can effectively guarantee to get into operation platform safely, can fold, and use unheavyly, can be applicable to the operation platform of construction usefulness such as the stretch -draw of prefabricated T roof beam (or precast box girder ) boundary beam prestressing force hogging moment, mud jacking, and install, maintain, demolish the convenience, translation rate is fast.