Steel shield plate: Material structure consists of panels, ribs, suppression band components. 12mm thick panel material selection over high-strength structural steel, welcoming the welding ribs. Per unit length of 5m, inter-cell high-strength composite rubber with soft connection. Gate whole have a certain angle with the horizontal when lifted, ensure the door structure can be lodging its own weight. In the case of lodging order to better protect the balloon, the shutter plate design has some arc. In normal use, pneumatic rubber dam allowed the top shield overflow, water landscape form. To prevent the next higher level in the downstream side of the upstream gate or wind action pour downstream side of the door with a folding door safety restraining belt, synthetic rubber band suppressed high strength of the material.