JP2015212517A - Tide gate and tide gate installation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tide gate capable of automatically shutting off.SOLUTION: A tide gate 1 which is provided to a breakwater 50 includes: a rotation axis 2 which is disposed along a vertical direction; and a door body 3 the base end of which is supported by the rotation axis 2 to rotate on the rotation axis 2 to thereby shut a gate 51 formed in the breakwater 50. The tide gate 1 also includes: side walls 4a which is disposed at the opposite side of the gate 51 relative to the door body 3 being separated a predetermined distance from the door body 3 protruding from the breakwater 50 along the door body 3 in an open state with the front end of the door body 3 at the upstream side in a water flow direction in the gate 51; and seal walls 4b for sealing the base end side of the door body 3 formed continuously with the side wall 4a of the breakwater 50.

Description

  The present invention relates to a breakwater door and a breakwater door installation method for preventing wave intrusion by closing an opening of a breakwater or an entrance of a structure as necessary.

  In the Great East Japan Earthquake on March 11, 2011, many firefighters who were involved in closing gates such as water gates near the coast were sacrificed. There are 25,000 gates in Japan, most of which are managed by prefectures and municipalities, and the closure work is often entrusted to fire brigade members. Therefore, in order to protect the life of the worker who performs the closing operation of the gate, it is desired to automatically close the sluice.

  Conventionally, for example, a breakwater door (floating body type flap gate) described in Patent Document 1 flows in a plurality of door blocks divided in a height direction so as to block an opening or an entrance through which water flows. The door body is configured by being connected to the water direction so as to be rotatable in a plane in the height direction, and the position facing the front end surface of the door body when the door block on the front end side in the height direction is in a lying state. In addition, a water guide pipe is provided in the water inflow direction. The water guide pipe includes a water intake portion in which an opening capable of taking in incoming water is formed, and a nozzle portion capable of ejecting the water taken in by the water intake portion toward the upper portion in the height direction of the front end surface of the door body. Therefore, overflow due to a delay in standing operation can be prevented, and reliability as disaster prevention equipment is improved.

JP 2012-197619 A

  As described above, there are 25,000 gates in Japan, and it is difficult to replace all of them with the above-described floating-joint flap gate. Therefore, a breakwater door that can automatically close the gate with a configuration similar to a conventional gate is desired.

  The present invention solves the above-described problems, and an object thereof is to provide a wave breaker door and a wave break door installation method capable of automatically closing a gate.

  In order to achieve the above-described object, a breakwater door according to the present invention is a breakwater door provided on a breakwater, and includes a rotary shaft arranged along a vertical direction and a base end supported by the rotary shaft. A door body that closes an open gate provided on the breakwater by rotating around the rotating shaft, and the tip of the door body is disposed upstream of the inflow direction of water in the gate. In the open state, on the opposite side of the gate in the door body, a side wall protruding from the breakwater along the door body at a predetermined distance from the door body, and the breakwater continuously to the side wall in the breakwater It is characterized by comprising a closing wall that closes the base end side of the door body.

  According to this breakwater door, a space that opens only upstream in the water inflow direction at the gate is formed by the door body, the side wall, and the closing wall. This space becomes a dead water area and generates hydrostatic pressure when water enters due to a tsunami or the like. On the other hand, since water passes through the gate, the pressure is reduced from the hydrostatic pressure by the velocity head due to the water flow. For this reason, the door body rotates due to rotational torque generated toward the gate side due to the water head difference, and closes the gate. As a result, the gate can be automatically closed.

  The wave breaker door according to the present invention further includes a holding mechanism that holds the door body in the open position, and the holding mechanism floats with the inflow of water by the floating body and allows the door body to move. It is characterized by that.

  According to this wave breaker door, the holding mechanism is provided so that the door body can be held at the open position to form a space surrounded by the door body, the side wall, and the closed wall, while the floating body The movement of the door closing the gate with the inflow of can be allowed.

  In the breakwater door of the present invention, the holding mechanism further includes another floating body that assists the floating of the floating body.

  According to this breakwater door, since the floating body is assisted by another floating body, the movement allowing the movement of the door body can be reliably performed.

  In the breakwater door of the present invention, the side wall is formed longer on the upstream side in the water inflow direction than the front end of the door body.

  According to this wave breaker door, the side wall is formed longer on the upstream side in the water inflow direction than the front end of the door body, so that the water surrounded by the door body, the side wall, and the closed wall Inflow can be guided. As a result, it is possible to easily generate a rotational torque due to a water head difference in the door body, and the gate can be reliably closed.

  Further, in the breakwater door of the present invention, the door body is configured to be one-sided open, and provided with an opposing side wall facing the side wall at an opening edge of the gate which is a front end side of the door body in a state where the gate is closed. It is characterized by that.

  According to this wave breaker door, the door body is configured to be one-sided and includes an opposing side wall, thereby blocking water that collides with the door body so as to rotate the door body in the opening direction (direction away from the gate). it can.

  Further, in the breakwater door of the present invention, the door body is configured to be double-opened, and each door body is in an open state in which the ends of both door bodies are arranged upstream of the water inflow direction in the gate. A side wall disposed along the door body at a predetermined distance from the door body on the opposite side of the gate, and a closing wall continuously covering the base end side of the door body. It is characterized by that.

  According to this breakwater door, even if the door body is configured to be double-opened, a space that opens only upstream in the water inflow direction at the gate is formed by the door body, the side wall, and the closing wall. This space becomes a dead water area and generates hydrostatic pressure when water enters due to a tsunami or the like. On the other hand, since water passes through the gate, the pressure is reduced from the hydrostatic pressure by the velocity head due to the water flow. For this reason, both door bodies generate rotational torque toward the gate side due to a water head difference, and rotate and move to close the gate. As a result, the gate can be automatically closed.

  According to the present invention, the gate can be automatically closed.

FIG. 1 is a perspective view of a wave breaker door according to an embodiment of the present invention. FIG. 2 is a perspective view of the wave breaker door according to the embodiment of the present invention. FIG. 3 is a plan view of the wave breaker door according to the embodiment of the present invention. FIG. 4 is an enlarged view of the lower end portion of the door body in the wave breaker door according to the embodiment of the present invention. FIG. 5 is a plan view showing the operation of the wave breaker door according to the embodiment of the present invention. FIG. 6 is a plan view showing the operation of the wave breaker door according to the embodiment of the present invention. FIG. 7 is a plan view showing the operation of the wave breaker door according to the embodiment of the present invention. FIG. 8 is a front view showing the holding mechanism for the wave breaker door according to the embodiment of the present invention. FIG. 9 is a side view showing the holding mechanism of the wave breaker door according to the embodiment of the present invention. FIG. 10 is a side view showing the operation of the wave breaker door holding mechanism according to the embodiment of the present invention. FIG. 11 is a side view showing a wave break door holding mechanism according to an embodiment of the present invention. FIG. 12 is a plan view showing another form of the wave breaker door according to the embodiment of the present invention. FIG. 13 is a diagram showing an analysis result of the action by the breakwater door according to the embodiment of the present invention. FIG. 14 is a diagram showing an analysis result of the action by the breakwater door according to the embodiment of the present invention. FIG. 15 is a diagram illustrating an analysis result of an action by the wave breaker door according to the embodiment of the present invention. FIG. 16 is a plan view showing another form of the wave breaker door according to the embodiment of the present invention. FIG. 17 is a plan view showing another form of the wave breaker door according to the embodiment of the present invention. FIG. 18 is a perspective view showing another form of the wave breaker door according to the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  1 and 2 are perspective views of a wave breaker door according to the present embodiment, FIG. 3 is a plan view of the wave breaker door according to the present embodiment, and FIG. 4 is a wave breaker according to the present embodiment. It is a lower end part enlarged view of the door body in a door, and FIGS. 5-7 is a top view which shows the effect | action of the wave-breaking door which concerns on this embodiment.

  As shown in FIGS. 1 and 2, the breakwater door 1 according to the present embodiment opens and closes a gate 51 of a breakwater 50 installed on land. The gate 51 serves as an entrance / exit in the breakwater 50. Depending on the height of the breakwater 50, there is a form in which the upper part is closed as shown in FIG. 1 or a form in which the upper part is opened as shown in FIG. Although not clearly shown in the figure, the gate is not limited to the breakwater 50, and the gate may be an opening serving as a building entrance or a sluice serving as a waterway entrance.

  The breakwater door 1 includes a rotating shaft 2 and a door body 3 that is rotatably supported by the rotating shaft 2. The rotating shaft 2 is provided at the opening side edge of the gate 51 and is disposed along the vertical direction. In the present embodiment, the rotary shaft 2 is illustrated as being provided at the vertical position of the door body 3, but the rotary shaft 2 may be configured to be continuous above and below the door body 3. The door body 3 is provided so that the base end is supported by the rotary shaft 2 and can be rotated around the rotary shaft 2. As shown in FIG. 3, the door body 3 is firmly configured by a plate member 3 a that closes the gate 51, and a frame member 3 b and a beam member 3 c that reinforce the plate member 3 a. And the breakwater door 1 makes the gate 51 an open state by arrange | positioning the front-end | tip of the door body 3 toward the upstream of the inflow direction of the water in the gate 51, as shown in FIGS. On the other hand, the breaker door 1 closes the gate 51 as shown by a one-dot chain line in FIG. 3 when the door body 3 rotates around the rotation shaft 2 from the open state. As shown in FIG. 4, the door body 3 is provided with a sealing material 3 d hanging from the lower end thereof. When the gate 51 is closed by the door body 3, the sealing material 3 d closes the lower end portion of the gate 51 by contacting the stepped portion 51 a that is inclined toward the opening end of the gate 51 and moves up. Thus, the door body 3 is configured to be one-sided.

  As shown in FIGS. 1 to 3, the breakwater door 1 is in a state where the door body 3 is in an open state, that is, in a state where the front end of the door body 3 is disposed upstream of the water inflow direction in the gate 51. 3 is provided with a side wall 4a disposed along the door body 3 at a predetermined distance from the door 51 on the opposite side of the gate 51, and a closing wall 4b that covers the base end side of the door body 3 continuously to the side wall 4a. Prepare. 1-3, the side wall 4a and the closing wall 4b are comprised by the wall body 4 integrally formed in the breakwater 50 along the door body 3 of an open state. That is, in the breakwater door 1 of the present embodiment, the door 5, the side wall 4 a, and the closing wall 4 b form a space 5 that opens only upstream in the water inflow direction at the gate 51.

  As shown in FIG. 5, in the case of such a breakwater door 1, when water enters the gate 51 due to a tsunami or the like (arrow W), water also enters the space 5. The water that has entered the space 5 is further blocked by the pressure of the water to be infiltrated, and there is no flow of water (even if there is a flow, it is a vortex in the space 5). Arise. On the other hand, since water passes through the gate 51, the pressure is reduced from the hydrostatic pressure by the velocity head due to the water flow. For this reason, as shown in FIG. 6, the door body 3 is rotated by rotational torque generated toward the gate 51 due to a water head difference, and closes the gate 51 as shown in FIG. 7.

  That is, in the breakwater door 1 of the present embodiment, the predetermined distance between the door body 3 and the side wall 4a is such that when water enters the space 5 surrounded by the door body 3, the side wall 4a, and the closing wall 4b, It is set to be a water area. For example, as shown in FIG. 3, the interval W between the door body 3 and the side wall 4 a is preferably equal to or greater than the thickness of the door body 3, and is further 0 with respect to the dimension L from the proximal end to the distal end of the door body 3. It is preferable to set the pressure in the range of 2 L or more and 1.0 L or less in order to suppress the flow out of the space 5 and obtain a dead water area.

  As described above, the breakwater door 1 according to the present embodiment is in the open state by the rotary shaft 2 arranged along the vertical direction and the base end supported by the rotary shaft 2 and rotating around the rotary shaft 2. The door body 3 is disposed on the opposite side of the door 51 from the gate 51 in an open state in which the front end of the door body 3 is directed upstream of the water inflow direction in the gate 51. And a side wall 4a disposed along the door body 3 at a predetermined interval, and a closing wall 4b that covers the base end side of the door body 3 continuously from the side wall 4a.

  According to the breakwater door 1, the door 5, the side wall 4 a, and the closing wall 4 b form a space 5 that opens only upstream in the water inflow direction in the gate 51. This space 5 becomes a dead water area when water enters due to a tsunami or the like, and a hydrostatic pressure is generated. On the other hand, since water passes through the gate 51, the pressure is reduced from the hydrostatic pressure by the velocity head due to the water flow. For this reason, the door body 3 is rotated by rotational torque generated toward the gate 51 due to a water head difference, and closes the gate 51. As a result, the gate 51 can be automatically closed. In addition, since the wave breaker door 1 of the present embodiment rotates and moves the door body 3 due to the water head difference, mechanical power for moving the door body 3 is not required. Moreover, the door body 3 has the same configuration as an existing gate that rotates around the rotary shaft 2 arranged along the vertical direction, and the wave breaker door according to the present embodiment with respect to the existing gate. The configuration of 1 can be easily applied.

  The door body 3 and the side wall 4a may or may not be parallel as shown in FIG. Further, the door body 3 and the side wall 4a may or may not be parallel to the water inflow direction in the gate 51. Moreover, although the side wall 4a has shown the form formed by the wall body 4 which protrudes from the breakwater 50, it does not have the wall body 4, but is formed by the wall in the opening part which comprises the gate 51 in the breakwater 50. May be. Moreover, when the gate 51 is a sluice which becomes an entrance / exit in the middle of a water channel, the side wall 4a is comprised as a part of side wall of a water channel.

  Moreover, the breakwater door 1 of this embodiment is provided with the holding mechanism 6 which hold | maintains a door body in the position of an open state, as shown in FIG. FIG. 8 is a front view showing the wave-breaking door holding mechanism according to the present embodiment, FIG. 9 is a side view showing the wave-breaking door holding mechanism according to the present embodiment, and FIG. It is a side view which shows the effect | action of the holding mechanism of the wave-breaking door which concerns on a form, and FIG. 11 is a side view which shows the holding mechanism of the wave-breaking door which concerns on this embodiment.

  As shown in FIG. 8, the holding mechanism 6 moves with the fixed portion 6 </ b> A when the stationary portion 6 </ b> A is fixed to a stationary portion such as the ground, the moving portion 6 </ b> B is attached to the door body 3, and the door body 3 is open. It has the connection part 6C which connects the part 6B. The fixing portion 6A and the moving portion 6B are formed with locking holes 6Aa and 6Ba that open in the vertical direction. These locking holes 6 </ b> Aa and 6 </ b> Ba communicate vertically when the door body 3 is open. The connecting part 6C has a locking hole 6Aa formed in the fixed part 6A and an insertion part 6Ca inserted into the locking hole 6Ba formed in the moving part 6B. The insertion portion 6Ca is formed in a wedge shape, and each locking hole 6Aa, 6Ba is formed in a diameter corresponding to the wedge shape of the insertion portion 6Ca. Further, the connecting portion 6C has a floating body 6Cb on the upper end side of the insertion portion 6Ca. The insertion portion 6Ca is configured as a weight (for example, about 20 kg) so as not to easily come out of the locking holes 6Aa and 6Ba, but the floating body 6Cb has a buoyant force that floats the insertion portion 6Ca when immersed in water. The insertion portion 6Ca is floated so as to come out of the locking hole 6Ba of the fixing portion 6A.

  Further, as shown in FIGS. 9 and 10, the holding mechanism 6 includes an operation unit 6 </ b> D that inserts and operates the connecting unit 6 </ b> C with respect to the fixing unit 6 </ b> A. In the operation part 6D, an intermediate part of a rod-like operation lever 6Db is rotatably supported via a shaft 6Dc with respect to an arm 6Da attached to the moving part 6B. A connecting portion 6C is attached to one end of the operation lever 6Db via a shaft 6Dd. Then, by operating the other end of the operation lever 6Db up and down, even if the insertion portion 6Ca is configured as a weight, the connecting portion 6C can be inserted into the fixed portion 6A as shown in FIG. As shown, the connecting portion 6C can be easily removed from the fixing portion 6A.

  Further, as shown in FIG. 11, the holding mechanism 6 may include an auxiliary release mechanism 6E. The auxiliary release mechanism 6E is provided on the door 3 with a pulley 6Ea, a floating body support 6Ec that supports another floating body 6Eb while allowing another floating body 6Eb to move upward, and another floating body 6Eb and the floating body 6Eb via the pulley 6Ea. A wire 6Ed connecting the other end of the operation lever 6Db. That is, the auxiliary release mechanism 6E pulls the wire 6Ed when another floating body 6Eb floats with the inflow of water, and this wire 6Ed pulls the other end of the operation lever 6Db downward. In this way, it is possible to assist in removing the connecting portion 6C from the fixed portion 6A.

  As described above, the breakwater door 1 of the present embodiment includes the holding mechanism 6 that holds the door body 3 in the open position, and the holding mechanism 6 floats with the inflow of water by the floating body 6Cb and the door body. Allow 3 movements.

  According to this breakwater door 1, by providing the holding mechanism 6, the door body 3 is held in the open position to form a space 5 surrounded by the door body 3, the side wall 4a, and the closed wall 4b. On the other hand, the movement of the door 3 that closes the gate 51 with the inflow of water can be permitted by the floating bodies 6Cb and 6Eb.

  In particular, since the wave breaker door 1 assists the floating body 6Cb to be lifted by another floating body 6Eb of the auxiliary release mechanism 6E, the operation of allowing the movement of the door body 3 can be reliably performed.

  In addition, when the breakwater door 1 is applied to the sluice gate of the water channel, the height positions of the floating bodies 6Cb and 6Eb are provided above the water surface of the water channel and above the water surface at the time of storm surge.

  In the breakwater door 1 of the present embodiment, as shown in FIG. 3, the side wall 4 a is preferably formed longer on the upstream side in the water inflow direction than the tip of the door body 3.

  According to the breakwater door 1, the side wall 4a is formed longer on the upstream side in the water inflow direction than the front end of the door body 3, so that it is surrounded by the door body 3, the side wall 4a, and the closing wall 4b. The inflow of water can be guided to the space 5. As a result, it is easy to generate a rotational torque due to a water head difference in the door body 3, and the gate 51 can be reliably closed.

  FIG. 12 is a plan view showing another form of the breakwater door according to the present embodiment. As described above, the wave breaker door 1 is configured such that the door body 3 is single-opened. And as shown in FIG. 12, the breakwater door 1 is provided with the opposing side wall 7a facing the side wall 4a in the opening side edge vicinity of the gate 51 used as the front end side of the door body 3 of the state which closed the gate 51. As shown in FIG.

  As shown in FIG. 12, the opposing side wall 7a is composed of an opposing wall 7 that is disposed so as to face the wall 4 and the gate 51 forming the side wall 4a. The opposing side wall 7a may or may not be parallel to the side wall 4a as shown in FIG. Further, the opposing side wall 7a may or may not be parallel to the water inflow direction at the gate 51.

  According to the wave breaker door 1, the door body 3 is configured to be single-opened and includes the opposing side wall 7a, so that the door body 3 collides with the door body 3 so as to rotate in the opening direction (the direction away from the gate 51). It can block the water that does.

  The opposing wall 7 constituting the opposing side wall 7a extends upstream in the water inflow direction. However, when the wall 7 is longer than the wall body 4, the water flowing in from the wall body 4 side is reflected to reflect the door body 3. Therefore, it is preferable that the wall body 4 has a length equivalent to that of the wall body 4 and extends upstream in the water inflow direction.

  13-15 is a figure which shows the analysis result of the effect | action by the breakwater door which concerns on this embodiment. 13 to 15, the horizontal axis indicates the time for water to flow toward the gate 51. 13 to 15, the vertical axis indicates the rotational moment (load) related to the door body 3, the solid line indicates the rotational moment that rotates the door body 3 in the closing direction (direction approaching the gate 51), and the broken line. Indicates a rotational moment for rotating the door body 3 in the opening direction (direction away from the gate 51). In this analysis, in FIG. 12, the opening of the gate 51 has a rectangular shape of 4 m × 4 m, and the weight of the door 3 that closes the gate 51 is 7 ton.

  FIG. 13 is an analysis result when water flows in from the direction of arrow A parallel to the door body 3 when the door body 3 is in the open state (a state opened 90 degrees from the closed state) in FIG. As shown in FIG. 13, when water flows in parallel to the door body 3, the water flows into the gate 51 and the water into the space 5 surrounded by the door body 3, the side wall 4 a, and the closed wall 4 b. Since the inflow is performed at the same time, the rotational moment that always rotates the door 3 in the solid line in the closing direction (direction approaching the gate 51) becomes large. For this reason, the door body 3 rotates and moves in the closing direction.

  FIG. 14 shows an analysis result in a state in which the door body 3 in FIG. 12 is rotated 20 degrees in the closing direction from the open state. As shown in FIG. 14, when the door 3 is rotated 20 degrees from the open state to the closing direction, the rotational moment for rotating the solid-line door 3 in the closing direction (direction approaching the gate 51) is further increased. For this reason, the door body 3 further rotates in the closing direction.

  FIG. 15 shows the direction of the arrow B in the direction of the arrow B inclined by 45 degrees from the opposite side wall 7a side with respect to the direction of the arrow A when the door body 3 is in the open state (the state opened 90 degrees from the closed state) in FIG. It is an analysis result when water flows in the direction to rotate in the opening direction. As shown in FIG. 15, when water flows in the direction in which the door body 3 is rotated in the opening direction, the door body 3 is initially set to rotate in the opening direction (direction away from the gate 51). A space that is surrounded by the door body 3, the side wall 4 a, and the closing wall 4 b has a large rotational moment that causes water to collide and rotates the broken door body 3 in the opening direction (the direction away from the gate 51). The inflow of water into 5 increases the rotational moment for rotating the solid-line door body 3 in the closing direction (direction approaching the gate 51). For this reason, the door body 3 rotates and moves in the closing direction. In this case, since the opposing side wall 7a is provided, the situation where water collides with the door body 3 so as to rotate the door body 3 in the opening direction (the direction away from the gate 51) is suppressed.

  The above analysis assumes that the entire door 3 is under the water surface. Not only this but the rotation moment which closes the door body 3 arises, even if the door body 3 whole does not become under water surface.

  FIG. 16 is a plan view showing another form of the wave breaker door according to the present embodiment, FIG. 17 is a plan view showing another form of the wave breaker door according to the present embodiment, and FIG. It is a perspective view which shows the other form of the breakwater door which concerns on this embodiment.

  The breakwater door 1 shown in FIGS. 16 to 18 is configured such that the door body 3 is double-opened. That is, the door 3 described above having a single opening is provided to face the gate 51 therebetween, and includes a side wall 4 a and a closing wall 4 b on the opposite side of the gate 51. Thus, even if the door body 3 is double-opened, the gate 51 can be automatically closed.

  In the wave breaker door 1 shown in FIGS. 17 and 18, the gate 51 is configured to be open at the top, and does not have a configuration for supporting the upper end side of the door body 3. In such a case, as shown in FIG. 16, when the double doors 3 are arranged on a straight line in a closed state, the doors 3 may be pushed and damaged by water pressure. For this reason, in the breakwater door 1 shown in FIG. 17 and FIG. 18, the door body 3 closes the gate 51 in a state where the front ends of the door body 3 face each other so that the outer surface in the water inflow direction is inclined toward the side wall 4a. Is configured to do. Moreover, the wave breaker door 1 shown in FIG. 17 and FIG. 18 is provided with an abutment (not shown) that holds the closed state in which the front ends of the door bodies 3 abut each other at the lower end portion of the door body 3. Yes. According to such a breakwater door 1, when there is no configuration to support the upper end side of the door body 3, even if the door body 3 is pushed by water pressure, the door bodies 3 support the water pressure by mutual butting. Since it acts, damage can be prevented.

DESCRIPTION OF SYMBOLS 1 Wave breaker door 2 Rotating shaft 3 Door body 4a Side wall 4b Closed wall 5 Space 6 Holding mechanism 6Cb Floating body 6Eb Another floating body 7a Opposite side wall 51 Gate

Claims (7)

  A breakwater door provided on the breakwater, provided on the breakwater by rotating around the rotation shaft with a rotation shaft arranged along a vertical direction and a base end supported by the rotation shaft A door body that closes the gate in the open state, and the door body is disposed on the opposite side of the gate body in the open state, with the front end of the door body facing upstream in the water inflow direction in the gate. And a side wall that protrudes from the breakwater along the door body at a predetermined interval, and a closing wall that covers the base end side of the door body in the breakwater continuously to the side wall. Breakwater door.   The holding mechanism for holding the door body in an open position is provided, and the holding mechanism floats with the inflow of water by a floating body and allows the door body to move. Wave door.   The wave preventing door according to claim 2, wherein the holding mechanism further includes another floating body that assists the floating of the floating body.   The said side wall is formed in the upstream of the inflow direction of water rather than the front-end | tip of the said door body, The breakwater door as described in any one of Claims 1-3 characterized by the above-mentioned.   The said door body is comprised by one side opening, The opposite edge | side wall facing the said side wall is provided in the opening edge of the said gate used as the front end side of the said door body in the state which closed the said gate. The breakwater door as described in any one of.   The door body is configured to be double-opened, and each door on the opposite side of the gate in each door body in an open state in which the front ends of both door bodies are arranged upstream of the water inflow direction in the gate. 5. A side wall disposed along the door body at a predetermined distance from a body, and a closing wall that covers the base end side of the door body continuously from the side wall. The breakwater door as described in any one of.   With respect to a breakwater having a gate, a rotating shaft arranged at the opening side edge of the gate along the vertical direction, and a base end supported by the rotating shaft, and rotating around the rotating shaft is opened. A door body that closes the gate, and a predetermined distance from the door body on the opposite side of the gate in the door body in an open state in which the tip of the door body is disposed upstream of the water inflow direction in the gate. And a side wall continuous with the breakwater so as to form a closed wall that protrudes from the breakwater along the door body and closes the base end side of the door body.

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