JP6352572B1 - Hotsunami sluice - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tsunami sluice gate that closes with the power of a wave such as a tsunami or storm surge and opens with its own weight at the end of the tsunami or storm surge. SOLUTION: The tsunami sluice 10 has a sluice body 12 on stoppers 7B, 8B on both sides of the sluice opening 2 from an open position where the sluice body 12 is attached to the sea floor outside the bay at the breakwater 1 The gate main body 12 can rotate around a support shaft 11 provided at the lower part of the water channel opening 2 between the closed gate position in contact with the vertical posture, and the sluice main body 12 has a kamaboko-shaped tank portion 16 capable of natural drainage and a sluice main body 12. And a closing operation arm portion 14 vertically attached to the front end side of the tsunami, and at the closing position of the tsunami sluice gate 10, the center of gravity of the tsunami sluice gate 10 is located outside the bay from the axis of the support shaft 11, and the support shaft 11. When the pressing force pressing the sluice main body 12 against the stopper portions 7B and 8B is released, the tsunami sluice gate 10 rotates toward its opening position by its own weight. [Selection] Figure 1

Description

  The present invention relates to a sluice gate provided at a waterway opening of a breakwater, and more particularly to a tsunami sluice gate that closes by the force of a wave such as a tsunami or storm surge and opens with its own weight at the end of a tsunami or storm surge.

  Breakwaters installed in bays, harbors, etc. protrude upward from the sea surface to prevent tsunamis from entering the bay. The breakwater is provided with a waterway opening that is the entrance of the ship. When a tsunami strikes, a tsunami sluice has been proposed that prevents the sluice provided at the waterway opening from closing by the tsunami wave force and preventing the tsunami from entering the bay (Patent Document 1).

  The tsunami sluice disclosed in Patent Document 1 is configured such that a base end portion of a sluice body is fixed to a rotating shaft extending in a horizontal direction, the sluice body and the rotating shaft are configured to be rotatable integrally, and an angle substantially perpendicular to the rotating shaft. The pressure receiving arm member is fixed. When the pressure-receiving arm member that protrudes upward from the sea surface tilts toward the inside of the bay due to the tsunami wave force, the rotation axis rotates, and the sluice body that was sinking horizontally on the sea floor outside the bay rotates toward the inside of the bay and begins to rise . When the sluice body begins to rise, the sluice body is pushed further toward the bay side by the tsunami wave force toward the bay side and stands up while rotating. When the pressure-receiving arm member reaches the seabed inside the bay, the sluice main body assumes a substantially vertical posture, stops rotating, and closes.

  In other words, the sluice main body is automatically closed by the tsunami wave force to prevent the tsunami from entering the inside of the breakwater through the water channel opening.

Japanese Patent No. 5759431

  By the way, when the tsunami pulls and the sea level inside and outside the bay becomes equal across the sluice body, it is necessary to open the sluice body. However, the tsunami sluice disclosed in Patent Document 1 has the pressure receiving arm member sinking to the seabed inside the bay in the closed state, so that the sluice main body standing in the vertical state rotates toward the outside of the bay by its own weight. hard. For this reason, it is necessary to push or pull the sluice body in the opening direction with an external force. In addition, when the sluice main body standing upright is rotated in the opening direction at once, the sluice main body rotates in the opening direction and falls to the sea surface with a large force. For this reason, when the sluice main body falls in the direction of the opening main body, a large wave is generated by receiving a large impact force on the sea surface.

  Therefore, the present invention has been made by paying attention to such unsolved problems of the conventional technology, and is closed by the force of waves such as tsunami and storm surge and opened by its own weight at the end of tsunami and storm surge. The purpose is to provide a tsunami lock gate.

  [Invention 1] In order to achieve the above object, the tsunami sluice gate of the invention 1 is a tsunami sluice gate that is openably and closably installed in a water channel opening provided in a part of a breakwater, and is a lower part of the water channel opening. A closed gate position in which the shaft portion extends along the width direction of the water channel opening and the shaft portion is disposed on the base end side and contacts the stopper portions disposed on the left and right sides of the water channel opening in a vertical posture. And a sluice main body that is rotatable about the axis of the shaft portion between the open gate position that reaches the bottom of the water wall in a horizontal posture on the water bottom outside the breakwater, and disposed on the distal end side of the sluice main body, And a closing operation arm portion for applying a force to rotate the sluice body toward the closed position when receiving a wave force directed from the outside to the inside of the breakwater. The center of gravity of the tsunami sluice gate is horizontal. The tsunami sluice gate is released when the pressing force that is located outside the breakwater and above the shaft center of the shaft portion and above the shaft center of the shaft portion and presses the sluice body against the stopper portion is released. Rotates toward the opening position under its own weight.

  [Invention 2] Further, the tsunami sluice gate of the invention 2 is the tsunami sluice gate of the invention 1, wherein the sluice body has a convex shape that protrudes from the axial center of the shaft portion toward the outside of the breakwater at a closed position. It is formed in the external shape which has the bottom part of, and has the space in which natural water drainage can be performed.

  [Invention 3] Further, the Tsutsunami sluice gate of Invention 3 is the tsunami sluice gate of Invention 2, wherein the bottom of the sluice body is fitted in the water bottom at the gate opening position.

  [Invention 4] The tsunami sluice gate according to invention 4 is the tsunami sluice gate according to any one of inventions 1 to 3, wherein a plurality of bearings are arranged along the axial direction of the shaft portion on the base end side of the sluice body. The plurality of bearings are rotatably attached to the shaft portion.

  [Invention 5] Furthermore, the tsunami sluice gate of Invention 5 is the tsunami sluice gate of any one of Inventions 1 to 4, wherein the gate operating arm portion is formed in a lattice shape.

  As described above, according to the tsunami sluice gate of the invention 1, the tsunami sluice that closed the waterway opening due to the tsunami or storm surge attacked and rotated to the open gate position by its own weight at the end of the tsunami or storm surge. The opening of the tsunami sluice is unnecessary, and the vessel can be started quickly.

  Furthermore, according to the tsunami sluice gate of the invention 2, the center of gravity of the sluice main body can be positively located outside the breakwater at the closed position, and the tsunami sluice gate is surely moved from the closed position toward the open position by its own weight. It can be rotated. In addition, water is drained naturally while rotating from the closed position to the open position, reducing the weight of the sluice body, so the tsunami sluice is slowly tilted and falls into the water, avoiding damage due to drop impact. And no big waves are generated.

  Furthermore, according to the tsunami sluice gate of the invention 3, the depth of the seabed extending from the water channel opening to the outside of the breakwater is increased, and safe navigation of the ship is guaranteed.

  Furthermore, according to the tsunami sluice gate of the invention 4, the sluice body can be reliably rotated, and the tsunami sluice can be easily attached.

  Furthermore, according to the tsunami sluice gate of the invention 5, the required acting force can be applied to the distal end portion of the sluice main body while reducing the weight of the distal end of the closing operation arm portion.

It is a disassembled perspective view of the tsunami sluice gate 10 concerning embodiment. It is sectional drawing along the AA line of FIG. 1, and shows an opening position. It is sectional drawing along the AA line of FIG. 1, and shows a closed gate position. It is a figure which shows the state in the middle of the tsunami wave sluice moving from the closing position shown in FIG. 3 to the opening position shown in FIG.

  Embodiments of the present invention will be described below. 1 to 4 are diagrams showing this embodiment.

First, the configuration of the present embodiment will be described.
FIG. 1 is an exploded perspective view of a tsunami sluice gate 10 according to the embodiment. The tsunami sluice 10 is rotatable between the open position shown in FIG. 2 and the closed position shown in FIG. 3 as shown in FIG.

  As shown in FIG. 1, the tsunami sluice gate 10 is disposed so that a water channel opening 2 provided in a part of the breakwater 1 can be opened and closed, and is normally maintained in an open gate position where the water channel opening 2 is opened, and a fishing boat or the like. Can be navigated. Moreover, the tsunami sluice gate 10 is maintained in a closed position where the water channel opening 2 is closed when a tsunami or storm surge strikes, and prevents sea level rise in the bay 4 inside the breakwater 1. The breakwater 1 is constructed in the sea by concrete, and the upper end protrudes upward with a predetermined height, for example, from the normal sea level WL1, and a tsunami and storm surge from the outside of the bay 3 outside the breakwater 1 To avoid entering. The geology of the water bottom (sea floor) SF on which the breakwater 1 is installed is not particularly limited, and may be any of concrete, rock, sand, mud, and the like.

  The water channel opening 2 is formed between the first wall body portion 7 and the second wall body portion 8 that face the left and right first breakwater portions 5 and the second breakwater portion 6 constituting the breakwater 1. When the height from the sea bottom to the upper end of the first wall body portion 7 and the second wall body portion 8 is H1, and the total length of the tsunami sluice gate 10 is H2, the relationship between the heights of H1 and H2 is H1 <H2. Yes.

  The 1st wall body part 7 and the 2nd wall body part 8 are formed in the L-shaped cross section in which the left and right wall parts 7A and 8A of the bay 4 side protruded to the water channel opening part 2 side. The width of the tsunami sluice gate 10 is defined as the opposing width of the base end side of the wall 7A and the wall 8A is L1, and the opposing width (gate width) of the protruding wall end of the wall 7A and the wall 8A is L2 (L2 <L1). When L3 is L3, the relationship between the lengths L1, L2, and L3 is L2 <L3 <L1. In wall part 7A, 8A, the wall part which goes to the bay outside 3 side is made into stopper wall part 7B, 8B which is a stopper part. The operation of the stopper wall portions 7B and 8B will be described later. The gate width L2 differs depending on the place where the breakwater 1 is installed, and can be set to about 5 m to 500 m, for example.

  The tsunami sluice gate 10 is a support that is a shaft portion extending in the horizontal direction and fixed between the first wall body portion 7 and the second wall body portion 8 at a position close to the sea floor SF that is the lower part of the water channel opening 2. With the axis of the shaft 11 as the center, it can rotate between the opening position shown in FIG. 2 and the closing position shown in FIG. In the closed position shown in FIG. 3, the tsunami sluice gate 10 abuts against the stopper walls 7B and 8B, so that the tsunami sluice 10 is prevented from rotating and the closed position is maintained. The support shaft 11 is made of a metal material that has been subjected to a corrosion resistance treatment.

  The tsunami sluice gate 10 has a sluice body 12, a bearing portion 13, and a closing operation arm portion 14. The sluice main body 12 is configured such that a steel plate tank portion 16 subjected to corrosion resistance treatment is integrally fixed to a bottom plate side of a steel plate closure plate portion 15 subjected to corrosion resistance treatment formed in a box shape. The bearing portion 13 is fixed to the proximal end side of the closing plate portion 15, and the closing operation arm portion 14 is fixed to the distal end side of the closing plate portion 15.

The structure of the sluice body 12 will be further described with reference to FIGS.
The closing plate portion 15 of the sluice main body 12 is formed in a box shape by surrounding the periphery of the upper plate 15a and the lower plate 15b of the rectangular plates facing each other with the outer plate 15c, and is highly rigid by the reinforcing member 15d provided inside. It is configured. A tank portion 16 is fixed to the lower plate 15 b side of the closing plate portion 15. The inside of the closing plate portion 15 may be communicated with the tank portion 16 so that seawater can be poured and drained, or concrete may be injected to further increase the rigidity.

  The tank portion 16 is surrounded by left and right outer plates 17, a bottom plate 18, and a closing plate portion 15 to form a space Q that is filled with seawater. The bottom plate 18 has a longitudinal section formed in an arc shape, one end side is fixed to the proximal end side of the closing plate portion 15, and the other end side is fixed to the distal end side of the closing plate portion 15. The tank portion 16 is provided with a reinforcing member 16a and the like inside so as not to be broken by the tsunami wave force.

  The tank portion 16 is provided with communication ports 19 and 20 that communicate the inside and outside of the tank on one end side and the other end side of the bottom plate 18. The one end side communication port 19 and the other end side communication port 20 are present at a position lower than the normal sea level WL1 at the opening position shown in FIG. 2, so that seawater is naturally injected into the tank portion 16. In addition, in the closed position where the tsunami hits as shown in FIG. 3, outside air enters the tank portion 16 through the other end side communication port 20 above the sea level WL <b> 2 at the time of abnormality, and enters the tank portion 16 through the one end side communication port 19. Seawater is drained naturally outside the tank. The one end side communication port 19 and the other end side communication port 20 can adjust the inner diameter and the number of them appropriately, and can adjust the time and amount of seawater pouring / draining.

  The bearing part 13 is comprised by the some bearing 21 arrange | positioned at intervals along the width direction of the closing board part 15, for example. The plurality of bearings 21 are configured in a two-part structure, one split bearing 21A is fixed to the closing plate portion 15 side, and the other split bearing 21B can be fixed to one split bearing 21A with a bolt or the like. Yes. One split bearing 21A is mounted on the support shaft 11, and the other split bearing 21B is mounted from the opposite side of the support shaft 11, and fixed to the one split bearing 21A with a bolt. Such work can be performed, for example, in the sea. In addition, by providing a stopper (not shown) that prevents the bearing 21 from moving in the axial direction with respect to the support shaft 11, it is possible to prevent the tsunami sluice gate 10 from inadvertently moving in the axial direction.

  In the closed position shown in FIG. 3, the closing plate portion 15 of the sluice main body 12 stands up in a substantially vertical state, and the tank portion 16 protrudes from the closing plate portion 15 to the outer bay 3 side. For this reason, the position of the center of gravity in the vertical direction of the sluice main body 12 exists on the outer bay 3 side with respect to the axial center of the support shaft 11 in a state excluding the closing gate arm 14. Further, in the state where the gate closing arm portion 14 is provided, the position of the center of gravity in the vertical direction of the tsunami sluice gate 10 is set on the outer bay 3 side with respect to the axis of the support shaft 11. That is, the gravity center position of the tsunami sluice gate 10 is located on the outer bay 3 side in the horizontal direction with respect to the axial center of the support shaft 11 and is located above the axial center in the vertical direction.

  For this reason, when the level of the sea level WL1 of the bay 4 and the bay 3 shown in FIG. 4 coincides and the tsunami pressing force pressing the sluice body 12 of the tsunami sluice gate 10 to the closed position is released, the tsunami sluice gate 10 rotates around the support shaft 11 in the three directions outside the bay by its own weight, and automatically settles on the sea floor SF on the bay outside 3 side of the water channel opening 2.

  A concave portion P in which a tank portion 16 that has landed on the sea floor SF is fitted is provided on the sea floor SF on the outer bay side 3 of the water channel opening 2. Therefore, the water depth of the water channel opening 2 can be increased, and a ship such as a fishing boat can safely pass through the water channel opening 2. Further, since the tank portion 16 is fitted in the recess P at the gate opening position, the tank portion 16 is not easily affected by the flow of tide, and no extra stress is applied to the support shaft 11.

  The closing arm 14 receives the force of a tsunami wave that strikes from the bay 3 toward the bay 4, and does not obstruct the passage of vessels such as fishing boats that pass through the waterway opening 2 during normal times. I have to. The closing arm 14 has a gate-shaped frame structure having left and right main struts 22 and 23, and the left and right main struts are directed upward from the front end of the closing plate 15 in the horizontal posture of the closing plate 15. 22 and 23 stand vertically. A reinforcing member 24 is attached between the main columns 22 and 23 and the upper plate 15 a of the closing plate portion 15.

  In the sluice body 12, both widthwise sides of the upper plate 15 a abut against the stopper wall portions 7 </ b> B and 8 </ b> B of the first breakwater portion 5 and the second breakwater portion 6 at the closed position. At this time, since the reinforcing member 24 is positioned below the upper end of the breakwater 1, the main columns 22 and 23 are attached to the closing plate portion 15 in order to prevent the reinforcing member 24 from interfering with the stopper wall portions 7B and 8B. It has a predetermined length inward from both ends in the width direction and is fixed. If the main struts 22 and 23 are high and there is no possibility that the reinforcing member 24 interferes with the stopper wall portions 7B and 8B at the closed position, the main struts 22 and 23 may be provided at both ends in the width direction of the closing plate portion 15. it can. The total length H2 of the sluice main body 12 and the height T of the main support columns 22 and 23 are different in specific dimensions depending on the installation conditions, and are not particularly limited, but are set to, for example, about 15 m to 25 m, more preferably about 18 m to 22 m. Can do.

  The upper horizontal member 25 is attached to the upper ends of the main column 22 and the main column 23, the lower horizontal member 26 is attached to the lower side of the upper horizontal member 25, and the upper horizontal member 25, the lower horizontal member 26, A sub strut 27 is attached between the two. In the present embodiment, the gate-operating arm portion 14 is formed in the form of a torii gate by the main columns 22, 23, the upper horizontal member 25, the lower horizontal member 26, and the auxiliary column 27.

  The closing arm 14 is a surface that receives the tsunami wave force toward the bay 3 side, and the rotational moment applied to the sluice main body 12 is the upper horizontal member provided on the upper part of the main columns 22 and 23. 25, the lower horizontal member 26, and the auxiliary column 27 play a large role. By forming the lattice shape with the upper horizontal member 25, the lower horizontal member 26, and the auxiliary support column 27, the pressure receiving portion 28 of the tsunami wave force having high rigidity and light weight can be provided without increasing the pressure receiving area more than necessary. Configure.

  Since the closing operation arm portion 14 is disposed on the distal end side of the sluice main body 12, a rotation moment that causes the sluice main body 12 is generated using the entire length of the sluice main body 12. When the closing arm 14 receives a tsunami wave force, it imparts a rotational moment to the sluice main body 12 that lies in a horizontal posture on the seabed SF toward the bay 4 side around the support shaft 11. When the sluice body 12 is triggered from the open position in the horizontal position, the tsunami wave force acts on the outer surface of the bottom plate 18 of the tank portion 16 which is the bottom of the sluice body 12 and rotates the sluice body 12 to the closed position while further raising it. . Thus, the gate closing arm 14 does not need to rotate the sluice main body 12 to a substantially vertical posture in contact with the stopper walls 7B and 8B, and therefore the pressure receiving surface that receives the tsunami wave force may be small.

  Since the gate-operating arm portion 14 has a gate-like shape like a torii gate, the pressure receiving area is small, but a sufficient rotating moment to cause the sluice body can be applied to the sluice body 12. Since the closing direction force received by the closing gate arm 14 acts on the distal end side of the sluice body 12, the sluice body 12 can be caused from a gate opening position with a small acting force.

  Further, at the closing position shown in FIG. 3, the closing operation arm portion 14 is in a horizontal position above the upper end of the breakwater 1, but the closing operation arm portion 14 is lightweight, and the sluice main body 12 has the tank portion 16 located outside the bay. Since it protrudes to the 3 side, the center of gravity of the tsunami sluice gate 10 exists on the 3 side outside the bay from the axis of the support shaft 11. In addition, since the closing arm 14 is located above the upper end of the breakwater 1 rather than the bottom of the bay 4 at the closing position, it is resistant to rotation in the opening direction unlike the case where it exists on the bottom. There is no influence of external force. Therefore, when the closed state where the tsunami sluice gate 10 is pressed against the stopper walls 7B and 8B by the tsunami wave force is released, the tsunami sluice gate 10 is weighted from the closed position to the open position around the support shaft 11. Move while rotating.

Next, the operation of the present embodiment will be described.
In the normal state shown in FIG. 2, the tsunami sluice gate 10 lies in a horizontal posture in an open state on the sea floor SF on the outer bay 3 side of the breakwater 1. Since the sluice main body 12 exists below the sea level WL1 at normal times, the seawater SW is poured into the tank portion 16 from the one end side communication port 19 and the other end side communication port 20 to full water. In the closing operation arm portion 14 standing upright with respect to the upper plate 15a of the closing plate portion 15, the upper horizontal member 25 and the lower horizontal member 26 protrude above the normal sea level WL1.

  As shown in FIG. 3, when a tsunami occurs, the tsunami strikes the breakwater 1 from the outer bay 3 toward the inner bay 4 at the rising sea level WL2. In the tsunami sluice gate 10 disposed in the water channel opening 2 of the breakwater 1, the tsunami wave force applied to the closing operation arm portion 14 acts on the distal end portion of the sluice main body 12, and the sluice main body 12 is centered around the support shaft 11 in the bay 4 A rotational moment rotating toward the side is applied, and the sluice body 12 starts to rise. Then, the tsunami wave force acts on the bottom plate 18 of the sluice main body 12, and the tsunami sluice gate 10 rotates around the support shaft 11 toward the bay 4 side with a large force. When the sluice main body 12 rotates to a substantially vertical position and both end portions in the width direction of the upper plate 15a contact the stopper wall portions 7B and 8B along the length direction, the sea level difference between the tsunami wave force and the bay 4 side ( The water main body 12 is closed by the water pressure based on WL2-WL1).

  In a state where the sluice body 12 stands in a substantially vertical posture, the seawater SW in the tank portion 16 is drained from the one end side communication port 19 located on the lower side and falls to the sea level WL2 on the bay outside 3 side. Further, the closing operation arm portion 14 is stopped in a horizontal posture at a position above the upper end of the breakwater 1, and the pressure receiving portion 28 is located on the bay 4 side from the axis of the support shaft 11. Since the pressure receiving portion 28 is lightweight, a moment that rotates in the direction toward the bay 3 side about the support shaft 11 acts on the tsunami sluice gate 10.

  When the sea level WL2 starts to decrease due to the end of the tsunami, the seawater SW in the tank unit 16 is further drained from the one end side communication port 19 and the weight of the tank unit 16 is also decreased. For this reason, the gravity center position of the tsunami sluice gate 10 moves closer to the axis center of the support shaft 11. When the sea level WL2 outside the bay further decreases and approaches the sea level WL1 inside the bay 4, the water pressure pushing the sluice body 12 toward the bay 4 side from the bay 3 decreases, and as shown in FIG. Rotation in the direction of the arrow starts around the support shaft 11 from the closed position where 10 stands up to the open position.

  When the tsunami sluice gate 10 starts to incline as shown in FIG. 4 from the closed position shown in FIG. 3 toward the open position shown in FIG. 2, the seawater SW in the tank portion 16 is drained and the sluice main body 12 is reduced in weight. At the same time, the center of gravity moves to the axial center side of the support shaft 11. For this reason, the tsunami sluice 10 starts to rotate slowly and falls to the sea surface SW without giving a large impact, and the seawater SW is poured into the tank portion 16 from the one end side communication port 19 and the other end side communication port 20. Land on the sea floor SF. Therefore, damage to the tsunami sluice gate 10 itself is avoided, and a large wave is not generated by an impact at the time of dropping.

  The tsunami sluice gate 10 automatically closes the water channel opening 2 of the breakwater 1 using the tsunami wave force when the tsunami strikes, and when the tsunami ends, the center of gravity is located outside the center of the support shaft 11 Although it is designed to automatically open due to its presence on the 3rd side, the waterway opening 2 can be automatically closed by the storm surge, and automatically opens at the end of the storm surge.

Next, the effect of this embodiment will be described.
According to the present embodiment, even if a tsunami or storm surge strikes, the tsunami sluice gate 10 is automatically closed by the force of the wave that strikes the waterway opening 2 and can prevent the tsunami and storm surge from entering the bay 4. . The closing arm 14 exerts a closing force on the distal end of the sluice body 12 and gives the tsunami sluice 10 a rotational moment in the closing direction. it can. For this reason, the pressure receiving portion 28 of the closing operation arm portion 14 can reduce the pressure receiving area, and thus the weight of the pressure receiving portion 28 can be reduced. Can be suppressed.

  Moreover, since the tsunami sluice gate 10 rotates with its own weight and opens the water channel opening 2 due to the end of the tsunami and storm surge, it is possible to immediately secure the navigation of a vessel such as a fishing boat. In particular, since the tsunami sluice gate 10 rotates slowly and falls to the sea surface and settles on the bottom of the sea, there is little damage to the tsunami sluice gate 10 and no large waves are generated.

[Modification]
The tsunami sluice gate 10 is not limited to the configuration of the above embodiment, and may have the following configuration.

  1. Both ends of the support shaft 11 are rotatably mounted between the first wall body portion 7 and the second wall body portion 8 of the breakwater 1, the sluice body 12 is fixed to the support shaft 11, and the tsunami is prevented by the rotation of the support shaft 11. The sluice 10 may be automatically opened and closed.

  2. The bottom plate 18 of the tank portion 16 is formed in a curved surface, and the tank portion 16 is formed in a so-called kamaboko shape. However, the shape may be a triangle or the like, and the center of gravity position of the tsunami sluice gate 10 is the axis of the support shaft 11. What is necessary is just a structure located in the bay outside 3 side rather than a heart. Moreover, although the communication ports 19 and 20 are formed in the one end side and other end side of the tank part 16, it is not limited to this position. In short, with the sluice body 12 protruding above the sea level, the sea level in the tank unit 16 can be drained so that the liquid level in the tank unit 16 is at the same level as the sea level, What is necessary is just to provide an appropriate number and size in the tank part 16 in the position where seawater can be filled with water.

  3. The closing arm 14 is composed of two main struts 22 and 23, but if the size of the sluice main body is large, the main strut is appropriately increased to three or four, such as a fishing boat. Install at intervals that can pass through. Moreover, as a material of the sluice main body 12 and the closing operation arm part 14, concrete, a fiber reinforced composite material, a rubber material, etc. can also be used suitably other than steel materials.

  4). The pressure receiving portion 28 is not limited to the torii shape, and may have any area that can raise the sluice body 12 by receiving the tsunami wave force, but normally protrudes upward from the sea surface WL1. Therefore, a good-looking shape is desired.

DESCRIPTION OF SYMBOLS 1 ... Breakwater, 2 ... Water channel opening part, 3 ... Outside bay, 4 ... Inside bay, 5 ... 1st breakwater part, 6 ... 2nd breakwater part, 7 ... 1st wall body part, 8 ... 2nd wall body part, 7A , 8A ... wall portion, 7B, 8B ... stopper wall portion, 10 ... Tsunami sluice gate, 11 ... support shaft, 12 ... water gate body, 13 ... bearing portion, 14 ... closing gate arm portion, 15 ... closing plate portion, 15a ... Upper plate, 15b ... Lower plate, 15c ... Outer plate, 15d ... Reinforcement member, 16 ... Tank part, 17 ... Outer plate, 18 ... Bottom plate, 16a ... Reinforcement member, 19 ... One end side communication port, 20 ... Other end side communication Mouth, 21 ... Bearing, 21A ... One split bearing, 21B ... The other split bearing, 22, 23 ... Main strut, 24 ... Reinforcement member, 25 ... Upper horizontal member, 26 ... Lower horizontal member, 27 ... Secondary Strut, 28 ... Pressure receiving part, WL1 ... Normal sea level, WL2 Abnormal at the time of the sea, SW ... seawater, SF ... submarine, T ... height, P ... recess, Q ... space

Claims (5)

A tsunami sluice gate that can be opened and closed at a water channel opening part of a breakwater,
A shaft that is installed at a lower portion of the water channel opening and extends along a width direction of the water channel opening;
A closed position where the shaft portion is disposed on the base end side and abuts in a vertical posture on stopper portions disposed on both left and right sides of the water channel opening, and an open position where the shaft is grounded horizontally on the water bottom outside the breakwater A sluice main body that is rotatable about the axial center of the shaft portion,
It is arranged at the front end side of the sluice body, stands up perpendicularly to the upper surface of the sluice body, and receives a wave force from the outside to the inside of the breakwater, the force to rotate the sluice body toward the closed position A gate operating arm part to act,
The gravity center position of the tsunami sluice gate in the closed position is positioned outside the breakwater in the horizontal direction above the shaft center of the shaft portion and above the shaft center of the shaft portion, and presses the sluice body against the stopper portion When the pressing force is released, the Tsunami sluice gate rotates by its own weight toward the gate opening position. In claim 1,
The sluice main body is formed in an external shape having a convex bottom portion that protrudes toward the outside of the breakwater from the shaft center of the shaft portion at a closed position, and has a space capable of natural water drainage. A tsunami sluice gate. In claim 2,
A tsunami sluice characterized in that a concave portion into which the bottom of the sluice body fits in the open position is provided in the water bottom. In any one of Claims 1 thru | or 3,
A tsunami sluice characterized in that a plurality of bearings are arranged on the base end side of the sluice body along the axial direction of the shaft portion, and the plurality of bearings are rotatably attached to the shaft portion. In any one of Claims 1 thru | or 4,
The closed gate arm has an upper end formed in a lattice shape.

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