Pre-stressed underpinning and reinforcing device for double-T plate structure and reinforcing method

The invention relates to the field of plant building and structural engineering of civil engineering, in particular to a pre-stressed underpinning and reinforcing device and a reinforcing method. Existing building structure reinforcing techniques belong to passive reinforcement systems, a concrete structure reinforcing method is insufficient in reliability and poor in durability, and a structure has to be required to unload during construction. The pre-stressed underpinning and reinforcing device for the double-T plate structure comprises a reinforcing device body for a double-T plate. The double-T plate comprises rib beams, the reinforcing device body comprises anchoring assemblies, underpinning limiting assemblies, tensioning balance assemblies and pre-stressed steel bars, the anchoringassemblies are matched with the rib beams, the tensioning balance assemblies are located between the underpinning limiting assemblies, and the pre-stressed steel bars are arranged on the rib beams. The device belongs to activ