Strengthening and protecting structure for large fillet weld at bottom of storage tank wall

The invention provides a strengthening and protecting structure for a large fillet weld at the bottom of a storage tank wall so as to improve the safety of a storage tank and prolong the service life of the storage tank. The strengthening and protecting structure is suitable for the storage tank in which a tank wall plate and a tank bottom plate are connected through welding. The strengthening and protecting structure comprises a strengthening and protecting component and a gas leakage detection unit. The strengthening and protecting component is annularly arranged at the lower portion of the storage tank wall and connected with the tank wall plate and the tank bottom plate to jointly form a narrow closed cavity in a defining manner. The gas leakage detection unit comprises a detection guide pipe and a gas leakage detection system. One end of the detection guide pipe communicates with the closed cavity, and the other end of the detection guide pipe is connected to the gas leakage detection system. The structu