Steel-concrete composite beam bridge construction method based on step-by-step alternate jacking and concrete construction control

Abstract

The invention relates to the technical field of large-span bridge construction, and provides a steel-concrete composite beam bridge construction method based on step-by-step alternate jacking and concrete construction control, which comprises the following steps: mounting and welding a steel truss beam on a bridge pier to form a continuous beam system, and executing a construction cycle by taking a midspan bending moment zero point, a main pier and a secondary main pier as supporting points in sequence, concrete construction of a midspan sagging moment area, a main pier hogging moment area and a secondary main pier hogging moment area is conducted in sequence; according to the method, prestress is systematically and quantitatively applied to the full bridge, structural safety and orderliness of internal force conversion in the construction process are guaranteed, linear controllability and uniform stress distribution are guaranteed, and the two systematic problems of linear high-precision control of a large-span continuous beam finished bridge and overall optimization of the full-bridge internal force state are solved.

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