In the relief gate type breakwater where the door stands up the relief gate type breakwater and

摘要

PROBLEM TO BE SOLVED: To provide a flap gate-type breakwater installed as a countermeasures against a tsunami and a high tide in a harbor, and a method for raising, bringing down, and mooring the breakwater which can raise the breakwater in a short period of time.;SOLUTION: The flap gate-type breakwater 11 is raised by the buoyancy of an air chamber 12b. The flap gate-type breakwater includes: a turning pulley 18 which is in a state of being housed in an underwater storage portion 14, and installed in a portion facing the backside 12c of a door body 12 having a plurality of sets of door body blocks B juxtaposed in a width direction; a hook 19 which is installed in a position facing a gate mooring portion 17 mounted to the backside 12c of the door body 12 of the storage portion 14 the intermediate portion of which has a rotational supporting point 19a; a mooring rope 20 the one end side of which is attached to a lower portion of the hook 19, and the other end side of which is pulled out to a water surface via the turning pulley 18; and a fixing device 21 which is provided at the other end side of the mooring rope 20 so as to fix the mooring rope 20 pulled out to the water surface. In the hook 19, two claw-like protrusions 19b and 19c engaged with the gate mooring portion 17 are provided at an upper side, and a weight 19d is provided in a lower portion. Since the door body can be raised by disengaging the claw-like protrusion, the intrusion of the tsunami can be effectively blocked.;COPYRIGHT: (C)2010,JPO&INPIT