Walking wheel reversing device and rear supporting leg of bridge girder erection machine

The utility model provides a walking wheel reversing device and a rear supporting leg of a bridge erecting machine. The walking wheel reversing device comprises a fixed flange and a driven sleeve piece rotationally connected with the fixed flange through a Z axis, the lower end of the driven sleeve piece is connected with a power box through a rotating shaft, the rotating shaft extends in the Y direction, and walking wheels are installed at the bottom of the power box. A driving mechanism used for driving the walking wheels to walk is installed on the power box, and the rotating axes of the walking wheels are parallel to the Y axis. According to the utility model, the driven external member which is rotatably connected is designed, and the walking wheel is arranged on the driven external member through the power box, so that the walking wheel can steer along with the driven external member, the walking wheel does not need to be disassembled, the working time increased by disassembling and assembling the walki