Curved surface telescopic device and beam body

The invention discloses a curved surface expansion and contraction device and a beam body, and relates to the technical field of bridges, the curved surface expansion and contraction device comprises a curved surface steel plate, an elastic supporting mechanism, a rigid supporting mechanism and a transition plate, one end of each curved-surface steel plate is connected with one beam body section through a plurality of groups of elastic supporting mechanisms which are arranged at intervals in the transverse bridge direction, and the other end of each curved-surface steel plate is connected with the other beam body section through a rigid supporting mechanism; the two transition plates are used for being connected with the curved steel plate and the top face of one beam body section so as to form a transition face for a vehicle to walk, one end of each transition plate is rotationally connected with the beam body section, and the other end of each transition plate is movably connected with the curved steel plat