Reinforcing structure suitable for dual-arch tunnel mid-partition and construction method

The invention discloses a reinforcing structure suitable for a dual-arch tunnel mid-partition and a construction method. The reinforcing structure comprises at least four steel web plates, the multiple steel web plates are sequentially welded to form the star-flower-shaped section manner, the embedding capacity of the reinforcing structure and the mid-partition can be greatly improved, the contactarea of the reinforcing structure and a rock-soil body is greatly increased, and the structure whole distortion-resisting capacity is improved. Grouting steel floral tubes are arranged on the two sides of each steel web plate, compaction between the reinforcing structure and the rock-soil body can be improved through pressure grouting, side friction resistance is greatly increased, and the unevendeposition of the mid-partition can be controlled. The two sides of each steel web plate are provided with steel ribs and a vibrating wire type earth pressure box, the steel ribs achieve the effect of improving the side frict