Prefabricated bridge deck space steel pipe concrete truss combined beam

Provided is a prefabricated bridge deck space steel pipe concrete truss combined beam including a steel pipe truss, and the combined beam is characterized by further including a plurality of independent bridge decks, two positioning grooves correspondingly cooperated with two top steel pipes of the steel pipe truss are arranged in the lower end face of each bridge deck, the upper half parts of the top steel pipes and the positioning grooves form cambered-surface contact, a plurality of circular ear plates are welded on each top steel pipe, each circular ear plate is formed by an arc part tightly coating the lower half part of the corresponding top steel pipe and a plane part arranged at the two ends of the arc part, and the plane part at the two ends of each circular ear plate is fixedly connected with the corresponding bridge deck through a high-strength bolt and a nut. By adopting such a combined beam structure, the prefabrication of the bridge decks and the construction of the lower part structure of a bridge can be carried out at the same time, and after the steel pipe truss is installed, the prefabricated bridge decks can be installed one by one starting from the bridge head, so that a large amount of space work can be prevented, the construction period of the bridge is greatly shortened, the cost is reduced, the personnel safety during the construction is guaranteed, and the engineering quality is improved.