Reinforcing structure for newly-built metro to pass through existing metro section

A reinforcing structure for a newly-built metro to pass through an existing metro section in an underneath mode aims to effectively improve the rigidity of the reinforcing structure and reduce foundation deformation and existing soil disturbance. Comprising newly-built side walls constructed at the two ends of a newly-built left side underground excavation tunnel and the two ends of a newly-built right side underground excavation tunnel underneath pass interval, and an existing subway interval grouting reinforcement body, a double-row large pipe shed and an inter-tunnel grouting reinforcement body which are located between the newly-built side walls on the two sides. The existing subway interval grouting reinforcement body is located below the existing left side tunnel and the existing right side tunnel, the double-row large pipe sheds are arranged above vaults of the newly-built left side underground excavation tunnel and the newly-built right side underground excavation tunnel, and the inter-tunnel grouting