（1） Regarding the installation and commissioning of cast iron gates

1. Before installation, it is necessary to first check the connecting screws between the vertical frame and the horizontal frame, and between the gate plates (referring to the combination of multiple gate plates), to see if they have become loose during transportation and loading, and whether their joints are misaligned. They should be adjusted to a flat surface, and the gap between the gate plate and the gate groove should be checked to ensure that the gap between the gate groove and the gate plate is not greater than 0.08mm. If there is a gap, the closing device can be adjusted. Tighten all connecting bolts.

2. During installation, the gate should be vertically inserted into the reserved slot, and adjustment pads should be placed under the two vertical frames (it is strictly prohibited to place crossbeams). The two vertical frames should be stabilized using manual hoists and diagonal braces. The gate should be straightened and leveled, and ground foot bolts should be threaded into each foot hole to adjust the position of the gate. The formwork should be supported for the second phase of pouring.

3. When pouring concrete, the mortar flowing into the gate, gate frame, inclined iron, and baffle should be thoroughly removed to prevent the mortar from solidifying and affecting the opening and closing of the gate.

4. Remove the reinforcement. Before the gate leaves the factory, in order to make the gate and gate frame fit tightly and reduce the gap after installation, 4-6 closing device pressure irons are installed on the upper and lower frames of gates over 2 meters. After adjusting the gap, the closing pressure irons should be removed to facilitate the opening and closing of the gate.

（2） Regarding usage and maintenance

1. When opening and closing the gate, attention should be paid to the upper and lower limit positions of the gate, and it should not exceed the limit to avoid damaging the gate or the hoist.

2. If there are any abnormal situations during the opening and closing process of the gate, it should be immediately stopped from use and checked and repaired in a timely manner.

3. When the gate is closed, pause for 2 minutes at a distance of 10 centimeters from the bottom of the gate to allow the rapids to wash away the debris in the bottom gate slot, and then close the gate again.