Repair structure suitable for large-area erosion damage of non-pressure tunnel section of flood discharge cavity

The utility model provides a repairing structure suitable for large-area erosion damage of a non-pressure tunnel section of a flood discharge cavity, which comprises a newly poured concrete layer arranged on an original bottom plate of the non-pressure section and covering the whole original bottom plate of the non-pressure section. A first concrete layer is arranged at the bottom of the sill aeration tank, and the upper surface of the first concrete layer is horizontal; a new aeration groove is formed above the in-hole aeration groove, and the distance between the new aeration groove and the in-hole aeration groove is not smaller than the thickness of the newly-poured concrete layer. When the whole tunnel section of the non-pressure tunnel area is eroded and damaged, the original tunnel bottom plate (namely the original bottom plate of the non-pressure section) is integrally heightened in a targeted manner, so that the original eroded surface can be repaired, and the investment can be controlled. The bottom