Temporary support for dismantling urban viaduct in complex environment and dismantling method

The invention relates to the technical field of viaduct reconstruction, in particular to a temporary support for dismantling an urban viaduct in a complex environment and a dismantling method. Step 2, paving a bridge deck and removing guardrails; thirdly, a beam bottom support is constructed; fourthly, the flange plates are cut and dismantled in a segmented mode; fifthly, the beam body is cut and dismantled in a segmented mode; sixthly, the pier column is cut and dismantled in a segmented mode; the viaduct has the beneficial effects that the support assemblies for supporting the viaduct body are arranged below the viaduct body, the viaduct body is cut into multiple sections through the rope saw, the cutting parts are aligned to the support assemblies, and the protective baffles are arranged between every two vertically adjacent support assemblies, so that falling objects generated by cutting can be collected, later cleaning can be facilitated, and the working efficiency is improved. The steel trestle hoisting