Single-box multi-chamber box girder bridge and a construction method thereof

A single-box multi-chamber box girder bridge include that substructure lower structure, single box and multi-chamber box girder, cast-in-place deck, transversely prestressed steel strand, a first longitudinally prestressed steel strand and a second longitudinally prestressed steel strand, Single box multi-chamber box girder includes two precast side beams and a plurality of interconnected precastmiddle beams between the two precast side beams. The precast side beams and the precast middle beams of I-beam structure can reduce the requirements of lifting equipment and the construction cost of single box multi-chamber box girder bridge in the hoisting construction. The first longitudinally prestressed steel strand and the second longitudinally prestressed steel strand improve the mechanicalstate of the middle and lower parts of the prefabricated side beam and the prefabricated middle beam, respectively; Prefabricated side beams and prefabricated middle beams are prefabricated parts, which have the characteristic