Anti-crystallization device for tunnel drainage blind pipe in operation period

The utility model discloses an operation period tunnel drainage blind pipe anti-crystallization device, a tunnel comprises a primary support and a secondary lining from outside to inside, the drainage blind pipe is arranged at the junction of the primary support and the secondary lining at the bottom of the tunnel in the length direction of the tunnel, and the drainage blind pipe comprises an outer supporting pipe, an inner pipe, a pesticide spraying assembly and a pesticide changing assembly; an inclined hole inclining outwards and downwards is formed in the secondary lining, the lower end of the inclined hole is communicated with a drainage blind pipe, the outer supporting pipe is arranged in the inclined hole, the inner pipe is arranged in the outer supporting pipe, and the pesticide spraying assembly and the pesticide changing assembly are sequentially arranged in the inner pipe from top to bottom. Compared with the prior art, according to the technical scheme of the utility model, the automatic dosing de