Modularized detachable steel-concrete composite beam and construction method thereof

The invention relates to a modularized detachable steel-concrete composite beam and a construction method thereof. A conventional steel-concrete composite beam adopted by an existing high-speed traffic-keeping defibering bridge has the problems that the conventional steel-concrete composite beam is difficult to dismantle and reuse, and the cost is relatively high. The modular bridge deck comprises spliced bridge deck slabs and modular steel beams. The spliced bridge deck slab is formed by longitudinally splicing bridge deck slab prefabricated units, and inter-slab connecting assemblies are arranged at the splicing positions. The modular steel beam is formed by longitudinally splicing modular steel beam sections, and an inter-beam connecting assembly is arranged at the splicing position. The bridge deck slab prefabricated units and the modular steel beam sections are connected up and down, and plate-beam connecting assemblies are arranged at the joints. The prefabricated bridge deck slab is used as a high-spee