Mixed prestress-based construction method of assembling type corrugated steel web combination box girder

The invention discloses a mixed prestress-based construction method of an assembling type corrugated steel web combined box girder. A combined girder body formed by transversely and longitudinally connecting multiple I-shaped girder body units, wherein each I-shaped girder body unit is formed by splicing a prefabricated concrete top plate, a prefabricated concrete base plate and a corrugated steel web plate which are independently prefabricated; transverse connection steel bars, longitudinal connection steel bars and top plate prestress ducts are buried in the prefabricated concrete top plates, and multiple upper stud notches are formed in two sides of the prefabricated concrete top plates along the longitudinal direction in a spacing manner; transverse connection steel bars, longitudinal connection steel bars, pretensioned prestress steel strands and base plate prestress ducts are buried in the prefabricated concrete base plates, and multiple lower stud notches are formed in two sides of the prefabricated co