Dam spillway structure

The utility model relates to the technical field of water conservancy projects, in particular to a dam spillway structure which comprises an inclined drainage channel, a discharge channel arranged at the lower end of the drainage channel, a gate arranged at the joint of the drainage channel and the discharge channel and a control power source used for controlling opening and closing of the gate. The device further comprises a collecting box arranged on the side, close to the drainage channel, of the gate and two fixing plates, a notch penetrating through the side wall of the collecting box is formed in the side face, away from the gate, of the collecting box, a plurality of water filtering holes are formed in the inner wall of each side of the collecting box, and one ends of the two fixing plates are connected with the inner walls of the two sides of the drainage channel correspondingly. The two opposite ends of the side face, close to the gate, of the collecting box abut against the corresponding fixing plat