JP2020125650A - Lifting gate type breakwater - Google Patents

Abstract

To speed up a standing start operation of a door body while keeping a gap between the door body and a storage portion small.SOLUTION: A lifting gate type breakwater 1 comprises: a door body 10 provided underwater and rotating from a fallen state around a rotation shaft 11 at a base end side by buoyance to stand; a storage portion 20 which is provided under the door body 10 in the fallen state and in which the door body 10 is stored; and a water supply mechanism 40 having a water storage chamber 41 and supplying water in the water storage chamber 41 to an inner space 24 of the storage portion 20 according to a start of standing of the door body 10.SELECTED DRAWING: Figure 3

Description

The present application relates to an undulating gate type breakwater.

An undulating gate type breakwater installed in a port as a measure against tsunami, storm surge, etc. is disclosed in Patent Document 1, for example. This type of breakwater includes a door body that stands up (floats) by buoyancy and a storage unit that stores the door body in a lying state. A gap is provided between the collapsed door body and the storage unit to such an extent that the operation of the door body is not hindered.

JP, 2011-111760, A

By the way, when the door body is floated (raised) by buoyancy, it is necessary to immediately flow the amount of water corresponding to the floating amount of the door body into the storage section. This is because, if such inflow of water does not occur, negative pressure is generated below the door body in the storage unit and opposes buoyancy. On the other hand, from the viewpoint of suppressing entry of sand and the like into the storage unit, there is a demand to set the gap between the door and the storage unit as small as possible. However, if this gap becomes small, the inflow operation of water is hindered when the door body starts to float, which may delay the operation of starting to float the door body.

The technique disclosed in the present application has been made in view of such circumstances, and an object thereof is to speed up the standing start operation (floating start operation) of the door body while reducing the gap between the door body and the storage unit. The purpose is to provide an undulating gate type breakwater that can be used.

The undulating gate type breakwater of the present application includes a door body, a storage section, and a water supply mechanism. The door body is provided in the water, and is rotated around the base end side rotation shaft by buoyancy from the fallen state to stand up. The storage unit is provided below the door body in the lying state, and the door body is stored therein. The water supply mechanism has a water storage chamber, and supplies water in the water storage chamber to the internal space of the storage unit as the door body starts to stand up.

According to the undulating gate type breakwater of the present application, it is possible to speed up the standing start operation (floating start operation) of the door body while reducing the gap between the door body and the storage unit.

FIG. 1 is a plan view showing a schematic configuration of an undulating gate type breakwater according to the first embodiment. FIG. 2 is a diagram showing the undulating gate type breakwater according to the first embodiment as viewed from the side. FIG. 3 shows a schematic configuration of the water supply mechanism according to the first embodiment, where (a) is a view as seen from the outside of the port and (b) is a view as seen from the side. FIG. 4 is a diagram for explaining the downward swinging motion of the door body. FIG. 5: is a figure for demonstrating the upward motion of a door. FIG. 6 shows a schematic configuration of the water supply mechanism according to the first embodiment, where (a) is a view as seen from the outside of the port and (b) is a view as seen from the side. FIG. 7 is a view showing an undulating gate type breakwater according to the second embodiment as viewed from the side.

Hereinafter, embodiments of the present application will be described with reference to the drawings. Note that the following embodiments are essentially preferable examples, and are not intended to limit the scope of the technology disclosed in the present application, its application, or its application.

(Embodiment 1)
Embodiment 1 of the present application will be described with reference to FIGS. 1 to 6. The undulating gate type breakwater 1 of the present embodiment is provided in a port as a measure against tsunami and storm surge, for example. As shown in FIG. 1, the undulating gate type breakwater 1 (hereinafter, also simply referred to as breakwater 1) is a so-called movable breakwater installed at the opening of the fixed breakwater 100.

As shown in FIGS. 2 and 3, the breakwater 1 includes a door body 10, a storage unit 20, a mooring mechanism 30, and a water supply mechanism 40. In FIG. 1, the upper side is inside the port and the lower side is outside the port. In FIG. 2, the left side is outside the port and the right side is inside the port.

The door bodies 10 are formed in a slightly flattened substantially rectangular body shape, and a plurality (four in the present embodiment) are arranged side by side in the width direction (the left-right direction in FIG. 1 ). The door body 10 has a rotating shaft 11 on the base end side (upper end in FIG. 1).

The door body 10 is provided in the sea so as to be rotatable around a rotation shaft 11. The door body 10 is rotated about the rotation shaft 11 by buoyancy from the fallen state to stand up (float). The door body 10 stands up to prevent water from entering the port from outside.

The door body 10 is moored in a laid state by the mooring mechanism 30. The door body 10 is configured such that the tip portion 12 (tip end side) swings up and down due to waves when lying down.

The storage unit 20 is partitioned below the door body 10 in a lying state, and the door body 10 constitutes a part of a partition wall. Then, the storage section 20 is configured such that the internal volume thereof is increased or decreased by the shaking of the door body 10.

Specifically, the storage unit 20 is provided on the seabed below the door body 10 in the lying state, and the door body 10 is stored in the lying state. The storage section 20 is formed in a substantially rectangular shape, and the door body 10 constitutes an upper wall as a partition wall of the storage section 20. The internal space 24 of the storage unit 20 thus formed is a semi-enclosed space. In this embodiment, one common storage section 20 corresponding to the four door bodies 10 is provided.

That is, the internal space 24 is formed below the door body 10, that is, between the bottom wall 22 which is a partition wall of the storage section 20 and the door body 10. The pivot shaft 11 of the door body 10 is installed on a vertical wall 23 inside the port, which is a partition wall of the storage unit 20. The interior space 24 is filled with water.

In addition, a gap d is provided between the vertical wall 21 outside the harbor, which is a partition wall of the storage unit 20, and the front end 12 of the door 10. Although not shown, a predetermined gap is also provided between the door bodies 10 adjacent to each other. The storage unit 20 is configured such that when the door body 10 rocks, the water in the internal space 24 flows in and out to the outside through the gap d (including the gap between the door bodies 10).

The mooring mechanism 30 moored the door body 10 in a prone state so that the door body 10 can be rocked by waves. In other words, the mooring mechanism 30 allows the door body 10 to oscillate due to waves, and also exerts a mooring force against the buoyancy of the door body 10 on the door body 10 to moorize the door body 10 in the lying state.

The mooring mechanism 30 has a hook 31. The hook 31 is rotatable about a shaft 32 provided at the base end portion thereof, and is hooked from above on the moored portion 13 provided at the tip end portion 12 of the door body 10. Thus, the above-mentioned mooring force acts on the door body 10 via the hook 31. The mooring mechanism 30 releases the mooring of the door body 10 by loosening the mooring force described above.

The water supply mechanism 40 has a water storage chamber 41, and supplies water stored in the water storage chamber 41 to the internal space 24 of the storage unit 20 as the mooring mechanism 30 releases the mooring and the door 10 starts to stand up. Is.

Specifically, the water supply mechanism 40 has a water storage chamber 41, a communication portion 46, an opening portion 50, and a suction portion 55. The water supply mechanism 40 is provided in the management ridge 3 provided on the side of the door 10.

The water storage chamber 41 is formed so as to maintain airtightness in water. More specifically, the water storage chamber 41 is formed in the management building 3 in the shape of a substantially rectangular container having airtightness. The water storage chamber 41 is adjacent to the storage unit 20 via the side wall 42. That is, the side wall 42 of the water storage chamber 41 is also a partition wall of the storage section 20.

Water is stored in the water storage chamber 41. As shown in FIG. 3, the water storage level of the water storage chamber 41 is maintained at a predetermined water level which is higher by a predetermined amount ΔH than the water level WL at the time of non-disaster of the sea surface. In the present embodiment, the water storage chamber 41 is maintained in a full state. The “water level WL during non-disaster” means not only the water level during normal times but also the water level during high tide. Here, “normal” refers to a case where there is no risk of flood damage such as high waves, high tides, tsunami, or flood. That is, the height of the water storage chamber 41 is higher than the water level WL at the time of non-disaster.

The communication part 46 connects the liquid layer part in the water storage chamber 41 and the storage part 20. The communication portion 46 is a communication hole (through hole) provided through the lower portion of the side wall 42, and two communication holes are provided.

The liquid layer portion in the water storage chamber 41 is a portion where water is stored. The number of the communication portions 46 described above is an example, and may be one or three or more.

The opening part 50 opens the internal space of the water storage chamber 41 to the outside air, so that the water in the water storage chamber 41 flows into the storage part 20 via the communication part 46 as the door 10 starts to stand up. .. That is, the opening part 50 allows air to flow from the outside into the internal space of the water storage chamber 41 when the door body 10 starts to stand. The opening portion 50 has an air supply pipe 51 and an opening/closing valve 52.

The air supply pipe 51 has one end communicating with the internal space of the water storage chamber 41 and the other end communicating with the outside air. The air supply pipe 51 corresponds to the first pipe according to the claims of the present application. One end of the air supply pipe 51 is connected to the upper wall 43 of the water storage chamber 41 and opens at the upper part of the internal space of the water storage chamber 41. The other end of the air supply pipe 51 is open to the outside of the management building 3 (that is, the outside of the water storage chamber 41).

More specifically, the other end of the air supply pipe 51 is open to the outside of the management building 3 outside the port (see FIG. 3B). Therefore, it is possible to eliminate the possibility that water outside the port will flow into the inside of the port via the communication portion 46, the water storage chamber 41, and the air supply pipe 51. In FIG. 3B, the left side is outside the port and the right side is inside the port.

The other end of the air supply pipe 51 may be opened to the outside inside the port. In that case, the other end of the air supply pipe 51 is opened at a position higher than the tip of the door body 10 that has been completely erected. By doing this, unless the water level outside the port exceeds the tip of the door body 10, it is possible to eliminate the possibility that the water outside the port will flow into the port inside via the communication portion 46, the water storage chamber 41, and the air supply pipe 51. You can

The on-off valve 52 is provided in the air supply pipe 51. The opening/closing valve 52 is opened when the door body 10 starts to stand. In the opening part 50, the open/close valve 52 is opened to open the internal space of the water storage chamber 41 to the outside air, and the water in the water storage chamber 41 is stored in the storage part 20 via the communication part 46 due to the head difference from the sea surface. It is supposed to flow into.

The suction unit 55 sucks the air in the water storage chamber 41 to raise the water storage level of the water storage chamber 41 to a predetermined water level which is higher by a predetermined amount ΔH than the water level WL at the time of non-disaster. That is, the suction unit 55 puts the water in the water storage chamber 41 into a negative pressure state (the pressure is lower than the atmospheric pressure) so that water is taken into the water storage chamber 41 from the storage unit 20 through the communication unit 46. It has become.

The suction unit 55 is provided in the operation room 44. The operation room 44 is provided above the water storage room 41 in the management building 3. A part of the air supply pipe 51 and the opening/closing valve 52 are also provided in the operation chamber 44.

The suction unit 55 has an intake pipe 56, a vacuum pump 57, a check valve 59, and a float switch 60.

The intake pipe 56 has one end that is an upstream end connected to the water storage chamber 41 side of the on-off valve 52 in the air supply pipe 51 and the other end that is a downstream end connected to the outside air side of the on-off valve 52 in the air supply pipe 51. There is. The intake pipe 56 corresponds to the second pipe according to the claims of the present application.

The vacuum pump 57 is provided in the intake pipe 56 and is driven when the opening/closing valve 52 is closed. The vacuum pump 57 is driven by an electric motor 58. In the suction unit 55, the vacuum pump 57 sucks the air in the water storage chamber 41, so that the internal space of the water storage chamber 41 is in a negative pressure state.

The check valve 59 is provided on the upstream end side (the water storage chamber 41 side) of the intake pipe 56 with respect to the vacuum pump 57. The check valve 59 allows only the flow of fluid (air) from the upstream end side to the downstream end side of the intake pipe 56.

The float switch 60 is provided in the water storage chamber 41 and detects the water storage level of the water storage chamber 41. In the suction unit 55, when the float switch 60 detects that the stored water level has risen to a predetermined water level which is higher by a predetermined amount ΔH than the water level W L at the time of non-disaster, the driving of the vacuum pump 57 is stopped. There is. In the present embodiment, when the float switch 60 detects that the water storage chamber 41 is filled with water, the vacuum pump 57 stops.

<Rotating motion of the door>
The swaying operation of the door body 10 described above will be described with reference to FIGS. 4 and 5. In the storage section 20, the wave causes the tip 12 of the door body 10 to oscillate up and down (the tip 12 of the door body 10 pivots about the pivot shaft 11), so that the internal volume (volume of the internal space 24). ) Increases and decreases. Then, as the internal volume of the storage unit 20 increases or decreases, the water in the internal space 24 flows in and out through the gap d described above.

Specifically, as shown in FIG. 4, when the water level rises due to waves, the wave force Fa acting downward on the door 10 increases. Therefore, the door body 10 swings downward. At that time, since the internal volume of the storage section 20 decreases and the pressure of the internal space 24 rises, the water in the internal space 24 flows out from the gap d. In the storage section 20, the pressure in the internal space 24 rises, so that the upward force Fb acts on the door 10.

Further, as shown in FIG. 5, when the water level is lowered due to waves, the force of the wave is reduced, and accordingly, the buoyancy Fc acting upward on the door body 10 is relatively increased. Therefore, the door body 10 rocks upward. At that time, since the internal volume of the storage section 20 increases and the internal space 24 is in a negative pressure state, water flows into the internal space 24 through the gap d. In the storage unit 20, the downward force Fe acts on the door body 10 due to the negative pressure of the internal space 24.

As described above, in the storage unit 20, when the door body 10 swings in any of the upper and lower directions, the forces Fb and Fe acting in the direction opposite to the swinging direction are generated. Therefore, shaking of the door body 10 is suppressed. In particular, since the swinging of the door body 10 upward is suppressed, the mooring force required for mooring the door body 10 in the mooring mechanism 30 is reduced. That is, the mooring force against the buoyancy Fc of the door body 10 is reduced.

From the above, from the viewpoint of reducing the mooring force, it is desirable that the gap d be as small as possible to allow the swing of the door body 10. That is, it is desirable that the gap d has a size that makes it difficult for water to flow in and out. When the door body 10 swings downward, the load on the mooring mechanism 30 decreases. That is, the mooring force for mooring the door body 10 in the mooring mechanism 30 is reduced.

<Operation of water supply mechanism>
The operation of the water supply mechanism 40 described above will be described with reference to FIGS. 3 and 6. First, as shown in FIG. 3, when the door body 10 is moored in a laid state (normal time), the water storage level of the water storage chamber 41 is higher than a predetermined water level (that is, the water level W L at the time of non-disaster). The water level is maintained at a predetermined amount ΔH higher.

In addition, in the normal state, the water supply mechanism 40 prevents the water in the water storage chamber 41 from flowing into the storage section 20 via the communication section 46. That is, the opening/closing valve 52 is closed and the internal space of the water storage chamber 41 is not open to the outside air. Therefore, in the water storage chamber 41, the internal space is a closed space having no opening other than the communication portion 46, so that outflow of water from the communication portion 46 to the storage portion 20 is prevented. The vacuum pump 57 is stopped.

Therefore, when the door body 10 swings upward, the inflow of water from the communication portion 46 is blocked in the storage section 20, so that the swinging of the door body 10 is effectively suppressed. Further, when the door body 10 swings downward, in the storage section 20, the outflow of water from the communication section 46 to the water storage chamber 41 is blocked, so that also in this case, the swinging of the door body 10 is effectively suppressed. It

In normal times, it is desirable to minimize the amount of air in the water storage chamber 41 (strictly speaking, including the portion of the air supply pipe 51 from the water storage chamber 41 to the opening/closing valve 52). Since air has compressibility and expandability, by reducing the amount of air in the water storage chamber 41, the inflow and outflow of water from the storage section 20 to the water storage chamber 41 is further suppressed when the door body 10 sways. Therefore, the shaking of the door body 10 is further suppressed.

As shown in FIG. 6, when the mooring mechanism 30 releases the mooring and the door 10 starts to stand up (float) due to buoyancy (emergency), the water supply mechanism 40 transfers water from the water storage chamber 41 to the storage section 20. Inflow (supply) of water is allowed.

Specifically, in the water supply mechanism 40, after the mooring by the mooring mechanism 30 is released, the open/close valve 52 is opened. Then, in the water storage chamber 41, the internal space is opened to the outside air, so that the water can flow out from the communication portion 46 to the storage portion 20. Therefore, when the door 10 starts to stand up, it is difficult for water to flow into the storage unit 20 from the gap d. However, the water storage level in the water storage chamber 41 is higher than the water level W.L. The water in the chamber 41 can easily flow into the storage unit 20 due to the head difference (predetermined amount ΔH) from the sea surface (water level WL during non-disaster). That is, the water supply mechanism 40 is configured to supply the water in the water storage chamber 41 to the internal space 24 of the storage unit 20 by the potential energy of the water in the water storage chamber 41.

Therefore, in the water storage chamber 41, water easily flows (is supplied) into the storage unit 20 as the door 10 starts to stand. That is, in the storage unit 20, water is supplied from the water storage chamber 41 as the internal volume increases due to the standing motion of the door body 10. As a result, the internal space 24 of the storage unit 20 is pressurized and the door 10 is pushed up, so that the standing start operation (floating start operation) of the door 10 can be accelerated. In other words, it is possible to suppress or prevent the internal space 24 of the storage section 20 from being in a negative pressure state, so that the rising start operation of the door body 10 can be speeded up.

In the water storage chamber 41, air is introduced through the air supply pipe 51 as water flows into the storage section 20.

Further, the gap d between the tip portion 12 of the door body 10 and the storage portion 20 increases as the door body 10 stands up. Then, when the gap d increases to a predetermined size (gap d1 shown in FIG. 6), a sufficient amount of water can flow into the storage section 20 through the gap d1 thereafter, so that the water from the water storage chamber 41 can be discharged. No water supply is required.

Therefore, the water supply mechanism 40 needs to supply water to the storage unit 20 until the door body 10 stands up at a predetermined standing angle at which the gap d becomes the gap d1. The required supply amount of water is the amount of water corresponding to the amount of increase in the internal volume of the storage unit 20 (hatched portion shown in FIG. 6) caused by the door body 10 standing up to the predetermined standing angle. Therefore, the above-mentioned predetermined amount ΔH is set to a value that can secure the required amount of supplied water.

After the door body 10 is completely erected, when the door body 10 is again moored in the collapsed state, the water supply mechanism 40 raises (recovers) the water storage level of the water storage chamber 41 to a predetermined water level. Specifically, the vacuum pump 57 is driven with the on-off valve 52 closed. Then, in the water storage chamber 41, air is sucked and discharged to the outside, and the water storage level rises accordingly. At that time, water flows from the storage section 20 into the water storage chamber 41 through the communication section 46.

Then, when the float switch 60 detects that the stored water level has risen to the predetermined water level, the vacuum pump 57 is stopped. In this way, the water storage level of the water storage chamber 41 is again maintained at the predetermined water level.

As described above, the undulating gate type breakwater 1 of the above-described embodiment includes the door body 10, the storage section 20, and the water supply mechanism 40. The door body 10 is provided in the water, and is erected from a fallen state by buoyancy so as to rotate around a rotation shaft 11 on the base end side. The storage unit 20 is provided below the door body 10 in the lying state, and the door body 10 is stored therein. The water supply mechanism 40 has a water storage chamber 41, and supplies the water in the water storage chamber 41 to the internal space 24 of the storage unit 20 as the door 10 starts to stand up.

According to the above configuration, the stand-up start operation (floating start operation) of the door body 10 can be accelerated while the gap d between the door body 10 and the storage unit 20 (including the gap between the door bodies 10) is reduced. You can By reducing the gap between the door body 10 and the storage unit 20, it is possible to prevent sand or the like from entering the storage unit 20.

Further, in the undulating gate type breakwater 1 of the above embodiment, the water storage chamber 41 is maintained at a predetermined water level which is higher than the water level WL at the time of non-disaster of the sea surface. The water supply mechanism 40 is configured to supply the water in the water storage chamber 41 to the internal space 24 of the storage section 20 by the potential energy of the water in the water storage chamber 41.

Specifically, the water storage chamber 41 is formed so as to maintain airtightness. In the water supply mechanism 40, the door body 10 is erected by opening the internal space of the water storage chamber 41 to the outside air, and the communication part 46 that communicates the liquid layer portion in the water storage chamber 41 with the internal space 24 of the storage part 20. And an opening portion 50 that allows water in the water storage chamber 41 to flow into the internal space 24 of the storage portion 20 via the communication portion 46.

According to the above configuration, the water in the water storage chamber 41 is stored in the storage unit 20 according to the head difference (predetermined amount ΔH) from the sea surface (water level WL during non-disaster), that is, the potential energy of the water in the water storage chamber 41. Can be made to flow into. Therefore, the water in the water storage chamber 41 can be easily supplied to the storage unit 20 without using a device such as a pump.

Further, in the undulating gate type breakwater 1 of the above-described embodiment, the water supply mechanism 40 includes the suction unit 55 that raises the water storage level of the water storage chamber 41 to a predetermined water level by sucking the air in the water storage chamber 41. With this configuration, the water storage level of the water storage chamber 41 can be easily restored to the predetermined water level.

Further, the undulating gate type breakwater 1 of the above-described embodiment is provided with a mooring mechanism 30 for mooring the collapsed door body 10 so that the door body 10 can be swayed by waves and for starting the standing of the door body 10 by releasing the mooring. There is. The storage unit 20 is configured so that the internal volume increases or decreases due to the swing of the door body 10.

According to the above configuration, by reducing the gap d, the swing of the door body 10 is suppressed, and the mooring force required for mooring the door body 10 by the mooring mechanism 30 can be reduced. Even in that case, the standing-up start operation of the door body 10 can be speeded up.

The open portion 50 is provided in the first pipe and the first pipe (the air supply pipe 51) whose one end communicates with the internal space of the water storage chamber 41 and whose other end communicates with the outside air, and the door body 10 starts to stand up. And an opening/closing valve 52 that is opened when the valve is opened. The suction part 55 has one end, which is an upstream end, connected to the water storage chamber 41 side of the opening/closing valve 52 in the first pipe (air supply pipe 51), and the other end, which is a downstream end, outside the opening/closing valve 52 in the first pipe. A second pipe (intake pipe 56) connected to the side, and a vacuum pump 57 provided in the second pipe and driven when the opening/closing valve 52 is in a closed state. According to this, a more specific configuration can be realized.

(Embodiment 2)
Embodiment 2 of the present application will be described with reference to FIG. 7. In this embodiment, in the undulating gate type breakwater of the above-described first embodiment, the configurations of the door body and the storage unit are changed and the mooring mechanism is omitted.

Similar to the first embodiment, the door body 70 is rotated around the base end side rotation shaft 71 by buoyancy from the fallen state and stands up. The storage unit 80 is provided below the door body 70 in the lying state, and the door body 70 is stored in the lying state. The internal space 84 of the storage part 80 is formed between the bottom wall 82 that is a partition wall of the storage part 80 and the door body 70. The interior space 84 is filled with water.

The lower surface of the door body 70 on the side of the front end portion 72 is brought into a lying state by seating on the seat portion 83 formed in the storage portion 80. In other words, the door body 70 is settled down and does not sway when it falls down. The door body 70 in the collapsed state generates buoyancy due to the introduction of air into the interior, and stands up (flies) by the buoyancy. Further, as in the first embodiment, a gap d is provided between the tip portion 72 of the door body 70 and the vertical wall 81 of the storage portion 80. Similar to the first embodiment, the storage section 80 is provided with a communication section 86 that connects the internal space 84 and the liquid layer section in the water storage chamber.

Also in this form, as the door 70 starts to stand, the water in the water storage chamber flows into the internal space 84 of the storage section 80 via the communication section 86. Therefore, the standing start operation of the door body 70 can be speeded up while the gap d between the door body 70 and the storage section 80 is reduced. Other configurations, operations, and effects are similar to those of the first embodiment.

(Embodiment 3)
Although not shown, the third embodiment of the present application will be described. The present embodiment is a modification of the undulating gate type breakwater of the first embodiment, in which the water in the water storage chamber is supplied to the storage section.

In this embodiment, the internal space of the water storage chamber is always open to the outside air, and the water supply mechanism 40 has an opening/closing mechanism for opening/closing the communication portion 46. The opening/closing mechanism is, for example, a valve provided in the communication section 46. The opening/closing mechanism closes the communication portion 46 during normal operation (when the door body 10 is lying down). In an emergency (when the door body 10 starts upright), the opening/closing mechanism opens the communication part 46 so that the water in the water storage chamber passes through the communication part 46 as the door body 10 starts upright. It is made to flow into the internal space 24 of the storage part 20. Thus, also in this embodiment, the water in the water storage chamber can be supplied to the storage unit 20 by the potential energy of the water in the water storage chamber.

Further, in the present embodiment, as a configuration for raising (recovering) the water storage level of the water storage chamber to a predetermined water level, instead of the suction unit 55 of the first embodiment, water (seawater) outside the water storage chamber is pumped. Is adopted. Other configurations, operations, and effects are similar to those of the first embodiment. The configuration of the present embodiment described above can be similarly applied to the second embodiment.

The technology disclosed in the present application may be configured as follows in the above embodiment.

Further, in the first embodiment, the mooring mechanism may be configured so that the mooring force acts on the door body 10 not only when the door body 10 swings upward, but also when the door body 10 swings downward. In this case, it is possible to reduce the mooring force for mooring the door body 10 in both up and down motions.

Further, in the first embodiment, the water storage chamber 41 is maintained in a full state, but the present invention is not limited to this, and the water storage chamber is maintained at a water level lower than full water as long as the swinging of the door body 10 can be allowed. Of course, you may do so.

Further, in the first embodiment, from the viewpoint of suppressing the inflow and outflow of water from the storage portion 20 to the water storage chamber 41 and suppressing the shaking of the door body 10, the amount of air in the water storage chamber 41 in the normal time is limited as much as possible ( Although it is desirable to reduce the amount, it is not necessary to limit the amount of air in the water storage chamber in the second embodiment because the door body 70 does not sway when lying down.

Further, the predetermined amount ΔH in the water storage chamber 41 does not have to be a value that satisfies the required amount of supplied water as described above. That is, the technique disclosed in the present application is to speed up the standing-up start operation of the door body 10 as compared with the conventional case, if the water storage level of the water storage chamber 41 is maintained at a water level higher than the water level WL in the non-disaster state. You can

Further, in the above-described embodiment, the water storage level of the water storage chamber 41 is maintained at a predetermined water level higher than the water level at the time of non-disaster on the sea level, but the present invention is not limited to this, and the water level higher than the planned high water level on the sea level. May be maintained at. The "planned high water level" is the water level assumed in the event of a disaster such as a high wave or high tide, and is higher than the water level in the non-disaster time.

Further, the undulating gate-type breakwater disclosed in the present application can be provided not only in a port but also in a river or a river mouth. In that case, the water storage level of the water storage chamber is maintained at a predetermined water level higher than the water level at the time of non-disaster of the river or the planned high water level.

As described above, the technique disclosed in the present application is useful for an undulating gate type breakwater.

1 Undulating gate type breakwater 10 Door 11 Rotating shaft 20 Storage part 24 Internal space 30 Mooring mechanism 40 Water supply mechanism 41 Water storage chamber 46 Communication part 50 Opening part 51 Air supply pipe (first pipe)
52 Open/close valve 55 Suction part 56 Intake pipe (second pipe)
57 Vacuum pump WL Water level during non-disaster

Claims (7)

A door body that is provided in the water and rotates around the pivot shaft on the base end side by buoyancy from the lying state to stand up,
A storage unit provided below the door body in a fallen state, in which the door body is stored,
An undulating gate type breakwater, comprising a water storage chamber, and a water supply mechanism for supplying water in the water storage chamber to the internal space of the storage unit when the door body starts to stand up. In the undulating gate type breakwater according to claim 1,
The water storage chamber, the water storage level is maintained at a predetermined water level higher than the water level at the time of non-disaster,
An undulating gate type breakwater, wherein the water supply mechanism is configured to supply the water in the water storage chamber to the internal space of the storage unit by the potential energy of the water in the water storage chamber. In the undulating gate type breakwater according to claim 2,
The water storage chamber is formed to maintain airtightness,
The water supply mechanism,
A communication part for communicating the liquid layer part in the water storage chamber and the internal space of the storage part;
By opening the internal space of the water storage chamber to the outside air, there is provided an opening part that allows water in the water storage chamber to flow into the internal space of the storage part via the communication part as the door body starts to stand up. An undulating gate type breakwater that is characterized by In the undulating gate type breakwater according to claim 3,
The undulating gate type breakwater, wherein the water supply mechanism includes a suction unit that sucks air in the water storage chamber to raise the water storage level of the water storage chamber to the predetermined water level. In the undulating gate type breakwater according to claim 2,
The water storage chamber has an internal space open to the outside air,
The water supply mechanism,
A communication part for communicating the liquid layer part in the water storage chamber and the internal space of the storage part;
The communication section is configured to be opened and closed, and by opening the communication section, water in the water storage chamber flows into the internal space of the storage section through the communication section as the door body starts upright. An undulating gate type breakwater, which has an opening/closing mechanism. In the undulating gate type breakwater according to claim 1,
While further mooring the laid-down door body so that the door body can be rocked by waves, the mooring mechanism for starting uprighting of the door body by releasing the mooring is further provided.
The undulating gate type breakwater, wherein the storage part is configured such that the internal volume thereof is increased or decreased by the shaking of the door body. In the undulating gate type breakwater according to claim 4,
The opening is
A first pipe having one end communicating with the internal space of the water storage chamber and the other end communicating with the outside air;
An opening/closing valve that is provided in the first pipe and is opened when the door body starts to stand up,
The suction unit,
A second pipe in which one end that is an upstream end is connected to the water storage chamber side of the on-off valve in the first pipe, and the other end that is a downstream end is connected to the outside air side of the on-off valve in the first pipe. When,
An undulating gate type breakwater, comprising: a vacuum pump which is provided in the second pipe and which is driven when the on-off valve is in a closed state.

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