To provide a two-stage type gate capable of putting the gate in a fully opening state by simple operation without cutting off a flow to the downstream side at water increase time.
When pulling up a guide rod 11, a first link 13 is pulled up, a lever 16 rocks, a second link 18 is pulled down, an upper stage door 1 descends, and water can be discharged in this state at ordinary time. When pulling up the guide rod 11 further at water increased time, a stopper 12 abuts to an upper part of a lower stage door 2, the lower stage door 2 integrally rises with the upper stage door 1 in a state of still lowering the upper stage door 1 to the upper stage door 2, and is put in the fully opening state without cutting off the flow to the downstream side, and without requiring work for connecting the upper stage door 1 and the lower stage door 2.
FUKUDA MINORU
OKAMOTO OSAMU
