PROBLEM TO BE SOLVED: To dispense with removal of a water cutoff membrane for blocking up mutual door bodies, when inspecting floatation confirmation of a standing start and operation confirmation between a falling-down state and a standing state.;SOLUTION: A land type flap gate 11 is provided by juxtaposing and connecting a plurality of door bodies 13 standing-rocking on the tip side in a row with the rear end side as a fulcrum 13a. One end of a rope 14 is installed in a rear end part of the door bodies 13, and the other end is installed in a counterweight 17. The counterweight 17 becomes the lowest point in the middle of standing or falling-down of the door bodies 13, and while assisting the standing or the falling-down when starting the standing or the falling-down, standing blocks 16a and 16b for guiding the rope 14 are installed under the rear end side of the door bodies 13 so as to act as resistance of the standing or the falling-down before completing the standing or the falling-down. A water cutoff membrane 20 for water-tightly blocking up the mutual adjacent door bodies 13 is formed as a trapezoidal shape of gradually expanding in a width toward the tip side from the rear end side of the door bodies 13. The present invention can be constructed regardless of the length between diameters, and can confirm floatation of a standing start only by suspending a floatation confirming inspection weight at a door body rear end part.;COPYRIGHT: (C)2016,JPO&INPIT
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