Construction method and structure of stacked type overturned gate

The invention discloses a construction method and structure of a stacked type overturned gate, and is an improvement of the patent '2015204051178-a simple flap gate.' The construction method that theoverturned gate is vertically stacked, an upper gate and a lower gate form a water retaining surface, and gate rotating shafts are all located on the downstream side of gates is adopted. During dry periods, the gates are erected to retain water, during flood period, when inflow exceeds the allowable flow, automatic overturn flood discharge is conducted from the upper gate to the lower gate, and after the flood, the gates are reset manually. According to the device made by the described method, the device includes the upper gate and the lower gate which are vertically stacked and arranged in agate chamber, the upper gate is rotatably connected with the side wall of the gate chamber through an upper rotating shaft and an upper shaft sleeve, and the lower gate is rotatably connected with theside wall of the gate cham