Movable overhead working trolley for steel box girder construction

A movable overhead working trolley for steel box girder construction comprises a plurality of groove-shaped frame units (1) which are arranged on the bottom face of a steel box girder and connected end to end, hanging bodies (2) connected with the end points of the groove-shaped frame units respectively, plastic nylon supporting wheels (3) and fixing pieces (4), wherein one end of each plastic nylon supporting wheel (3) is arranged on a steel box girder air nozzle, and the other end of each plastic nylon supporting wheel (3) is fixed to the corresponding hanging body. Each groove-shaped frame unit comprises a groove-shaped frame formed by welding a plurality of cross beam rods (1a) and a plurality of stand column rods (1b) and a bottom plate (1c) arranged in the groove-shaped frame, each hanging body is a C-shaped frame body formed by welding a vertical rod (2a) and a cross rod (2b), and the groove-shaped frame units are fixedly connected through fixing pieces. According to the utility model, the characterist