Simply supported beam expansion joint device and bridge

The embodiment of the utility model provides a simply supported beam expansion joint device and a bridge, and the simply supported beam expansion joint device comprises a flexible water stop belt which extends in the transverse direction, the flexible water stop belt is connected between the ends of two adjacent simply supported beams, and the transverse direction is the width direction of the simply supported beams; the ballast blocking steel plate set extends in the transverse direction, the ballast blocking steel plate set is connected between the ends of every two adjacent simply supported beams, the ballast blocking steel plate set is located above the flexible water stop belt, and the ballast blocking steel plate set is fixed to one of the simply supported beams. Through the simply supported beam expansion joint device, the problem of water leakage of a simply supported beam connecting joint is solved, and ballast leakage caused by dislocation of the ballast blocking steel plate is prevented by fixing t