Large-span bailey piece and large-span bailey beam

The utility model relates to the technical field of bridge construction, and provides a large-span bailey piece and a large-span bailey beam, the large-span bailey piece comprises two chord members which are arranged at intervals and two web members which are arranged between the two chord members, the two web members and the two chord members are arranged in a rectangular mode, and diagonal bars are arranged between the adjacent web members and chord members; the chord members and the web members form a rectangular frame, and the diagonal bars on the inner side of the rectangular frame form a quadrilateral structure; a butt joint is arranged at the end part of one end of the chord member, and a butt joint groove is concavely formed in the end part of the other end; the butt joint of one of two adjacent large-span beret pieces is detachably arranged in the butt joint groove of the other of the two adjacent large-span beret pieces. Under the same span condition, the number of the arranged large-span beret piec