Heaving wave-breaking device

Abstract

To provide a derricking breakwater device in which a door body can stand only when necessary.SOLUTION: A derricking breakwater device comprises: a laid member installed on the sea bottom; a door body capable of oscillating between a laid position and an erected position; a first holding member holding the door body against wave force in a compressional wave direction in the erected position; a second holding member holding the door body against wave force in a backwash direction in the erected position; a first bag body provided below one end and restraining the door body from being erected due to wave force in a backwash direction by receiving liquid supply to inflate; a second bag body provided below the other end and restraining the door body from being erected due to wave force in a compressional wave direction by receiving liquid supply to inflate; and a liquid supply / discharge facility which supplies liquid to the first bag body and the second bag body or which discharges liquid from the first bag body and the second bag body.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an undulating breakwater device. [Background technology]

[0002] Conventionally, a deploying breakwater device is known which includes a door body that can be raised by wave forces from a fallen position approximately parallel to the underlying member to an approximately vertical upright position, and a belt that holds the door body in the upright position against wave forces in the forward or backward wave directions (see Patent Document 1).

[0003] According to the undulating type breakwater device of Patent Document 1, when excessive waves such as a tsunami occur, the gate body rises up in response to wave forces in the forward or backward direction, and the raised gate body is held in the raised position by a belt. Therefore, the wave-breaking effect of the gate body held in this raised position can absorb the energy of the waves, thereby reducing damage caused by tsunamis, etc. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-159912 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the gate body of the deploying breakwater device in Patent Document 1 has the problem that it can be raised by waves or high tides generated when a ship passes, which can cause the gate body to come into contact with the hull and damage the hull.

[0006] The present invention has been made in consideration of the above circumstances, and has an object to provide a boom-type breakwater device in which a gate body can be raised only when necessary. [Means for solving the problem]

[0007] In order to solve the above problem, one aspect of the present invention provides a descent-type breakwater device that includes an underlay member that is installed on the bottom of the water, a door body that can swing between a lying position where it falls in a state approximately parallel to the underlay member and an upright position where it stands up relative to the underlay member, and in the lying position, one end that receives wave force in the forward wave direction and the other end that receives wave force in the backward wave direction are each set higher than the underlay member, and the area between each end and the lower surface that contacts the underlay member is formed in an approximately downward arc shape or approximately trapezoid shape in a side view, and the door body is moved to the upright position against the wave force in the forward wave direction. the gate body being provided below the other end and expanding when supplied with fluid to prevent the gate body from rising up due to the wave force in the forward wave direction; and a fluid supply and discharge device that supplies fluid to the first bag body and the second bag body, or discharges fluid from the first bag body and the second bag body.

[0008] According to this configuration, a fluid supply / discharge facility is provided for supplying and discharging a fluid to the first bag body and the second bag body (hereinafter, both bags are sometimes collectively referred to simply as the "bag body") provided below one end and the other end of the door body, so that the door body can be prevented from rising or made to be able to rise as necessary. For example, when no earthquake has occurred and there is no risk of a tsunami, fluid can be supplied to the bag body and the bag body expanded by receiving the supply of the fluid can support one end and the other end of the door body, thereby preventing the door body from rising due to waves generated when a ship passes. On the other hand, when an earthquake has occurred and there is a risk of a tsunami, the fluid can be discharged from the bag body and support of the door body by the bag body can be released, making it possible to make the door body able to rise.

[0009] The first bag and the second bag are closed at their outer periphery. air It is preferable that the container has a tightly sealed structure, and when supplied with the fluid, the upper surface of the container expands so as to protrude in an arc shape.

[0010] According to this aspect, by supporting one end and the other end of the door body on the upper surface of the bag body which protrudes in an arc shape when supplied with fluid, it is possible to properly prevent the door body from inadvertently rising up.

[0011] It is preferable that the fluid supply and discharge equipment comprises a supply and discharge pipe through which the fluid supplied to and discharged from the first bag body and the second bag body flows, a supply valve installed in the supply and discharge pipe and driven in an opening direction to supply fluid to the first bag body and the second bag body, a discharge valve installed in the supply and discharge pipe and driven in an opening direction to discharge the fluid from the first bag body and the second bag body, and a control device that controls the opening and closing operations of the supply valve and the discharge valve.

[0012] According to this aspect, the bag body is connected to a supply and discharge pipe provided with a supply valve and a discharge valve, so that the supply and discharge of fluid can be appropriately switched by opening and closing the supply valve or opening and closing the discharge valve.

[0013] It is preferable that the undulating type breakwater device according to claim 3 further comprises a seismometer that detects earthquakes, and the control device opens the discharge valve when an earthquake is detected by the seismometer.

[0014] According to this aspect, when an earthquake is detected and the occurrence of a tsunami is anticipated, the discharge valve is automatically driven in the opening direction, and as a result, fluid is discharged from the bag body in response to the drive, allowing the door body to be raised.

[0015] It is preferable that the fluid supply and discharge equipment further includes an emergency discharge valve having a built-in battery, and that when electricity is not supplied from the control device, the emergency discharge valve is driven in the open direction by receiving electricity from the battery.

[0016] According to this aspect, even if electricity is no longer supplied to the exhaust valve during a power outage, the emergency exhaust valve equipped with a built-in battery can be driven in the opening direction, thereby enabling the door body to be raised.

[0017] The holding member is preferably a belt having elasticity or flexibility.

[0018] According to this aspect, the load on the door body when the door is raised can be reduced.

[0019] According to another aspect of the present invention, there is provided a deflation-type breakwater device comprising: an underlayment member installed on the bottom of the water; a door body which can swing between a fallen position in which it falls approximately parallel to the underlayment member and an upright position in which it stands up relative to the underlayment member, and in the fallen position, one end which receives wave force in the forward wave direction and the other end which receives wave force in the backwash direction are each set higher than the underlayment member, and the distance between each end and the underside which contacts the underlayment member is formed in a downward approximately arc-like or approximately trapezoidal shape in a side view; a first retaining member which holds the door body in the upright position against the wave force in the forward wave direction; a second retaining member which holds the door body in the fallen position against the wave force in the backwash direction; a bag body which is provided below the other end and expands when supplied with fluid to prevent the door body from standing up due to the wave force in the forward wave direction; and a fluid supply and discharge facility which supplies fluid to the bag body or discharges fluid from the bag body.

[0020] For example, when a hoisting type breakwater device is installed near the mouth of a river, there is little need to prevent backwash when a tsunami occurs, and it may be required to prevent only forward waves. The hoisting type breakwater device according to the other aspect is useful in such cases. That is, in the hoisting type breakwater device, the bag body is installed only at the other end of the gate body, which is the end opposite to the end receiving the wave force in the forward wave direction, so that the number of bags is reduced to simplify the structure, while allowing the gate body to rise due to the wave force in the forward wave direction by discharging fluid from the bag body when a tsunami occurs, and the energy of the waves can be absorbed by the raised gate body. In addition, during normal times when no tsunami is generated due to an earthquake, the bag body that expands by receiving a supply of fluid at the other end and the second holding member that holds the gate body in a collapsed position against the wave force in the backward wave direction can appropriately prevent both the gate body from rising due to the wave force in the forward wave direction and the gate body from rising due to the wave force in the backward wave direction. Effect of the Invention

[0021] As described above, according to the present invention, it is possible to provide an elevation-type breakwater device in which the gate body can be raised only when necessary. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a perspective view of a first embodiment of a wave-breaker device according to the present invention in its normal state. [Diagram 2] FIG. 2 is a front view of the wave-breaking device. [Diagram 3] FIG. 2 is a plan view of the wave-breaking device. [Figure 4] FIG. 2 is a side view of the wave-breaking device. [Diagram 5] FIG. 2 is a circuit diagram of the air supply and exhaust equipment for the wave-breaker. [Figure 6] 3A is a side view of the air bag when inflated, FIG. 3B is a front view, and FIG. 3C is a plan view. [Figure 7] 1A and 1B are diagrams for explaining the function of the air bag, in which (a) is a side view showing the inflated air bag in contact with the door body, and (b) is a side view showing the state in which the door body can be raised by the contraction of the air bag. [Figure 8] FIG. 2 is a perspective view showing the state when the door body of the wave-rising type breakwater device is raised by an incoming wave. [Figure 9] 1A and 1B show the state in which the door body of the above-mentioned wave-rising type breakwater device is raised by an incoming wave, (a) being a plan view and (b) being a side view. [Figure 10] 1A and 1B show the state when the door body of the above-mentioned wave-rising type breakwater device is raised by an undertow, (a) being a plan view and (b) being a side view. [Figure 11] 1A and 1B are diagrams for explaining the function of the laying member of the undulating breakwater device, where (a) is a perspective view and (b) is a side view. [Figure 12] FIG. 11 is a plan view and a side view of a wave-breaker device according to a second embodiment of the present invention in normal operation; [Figure 13]1A and 1B show the state in which the door body of the above-mentioned wave-rising type breakwater device is raised by an incoming wave, (a) being a plan view and (b) being a side view. [Figure 14] 11A is a front view of an air bag according to a third embodiment of the present invention when inflated, FIG. 11B is a plan view, and FIG. 11C is a side cross-sectional view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0024] (First embodiment) 1 to 4 are diagrams showing the normal state (when there are no incoming or outgoing waves due to an earthquake) of the derrick-type breakwater device according to the first embodiment of the present invention. As shown in these figures, the derrick-type breakwater device includes a base member 12 laid at an entrance (channel) 31 separated by a fixed breakwater 30 in a harbor, a door body (gate) 11 arranged on the top of the base member 12, a first air bag 40A (corresponding to the "first bag body" in the present invention) installed below one end 11a of the door body 11, a second air bag 40B (corresponding to the "second bag body" in the present invention) installed below the other end 11b of the door body 11, and an air supply and exhaust system 20 (corresponding to the "fluid supply and exhaust system" in the present invention) that supplies and exhausts air to the first and second air bags 40A and 40B. First and second air bags 40A, 40B and air supply and exhaust equipment 20 are connected by air supply and exhaust hose 22 extending from air supply and exhaust equipment 20, piping chamber 25 to which the tip of air supply and exhaust hose 22 is connected, and multiple flexible hoses 23 that connect piping chamber 25 and air bag 40. Note that below, first and second air bags 40A, 40B may be collectively referred to simply as "air bag 40".

[0025] The undulating wave breaker device can allow or prevent the gate body 11 from rising depending on whether a tsunami has occurred. For example, when no earthquake has occurred and there is no risk of a tsunami, air is supplied to the air bag 40, and the air bag 40, which has expanded with the air supply, supports the gate body 11. This makes it possible to prevent the gate body 11 from being inadvertently raised by waves generated when a ship 34 passes. On the other hand, when an earthquake has occurred and there is a risk of a tsunami, air is discharged from the air bag 40, and support of the gate body 11 by the air bag 40 is released. This makes it possible to allow the gate body 11 to rise and reduce damage from a tsunami.

[0026] 1 and the like, the door body 11 has a generally rectangular shape in plan view extending in the width direction of the entrance / exit 31, etc. When the width of the entrance / exit 31, etc. is wide, multiple units (two units in this example) are arranged side by side to cover the width as shown in Figures 1 and 8. In this case, a guide plate 14 is provided between adjacent door bodies 11 to restrict the lateral movement of the door bodies 11.

[0027] When air bag 40 is contracted (air bag 40 is in a contracted state), door body 11 can swing between a laid position (see FIG. 4) where it falls substantially parallel to laying member 12, and an upright position (see FIG. 9(b) and FIG. 10(b)) where it stands substantially perpendicular to laying member 12. On the other hand, when air bag 40 is inflated (air bag 40 is inflated state), door body 11 cannot stand in the upright position and is held in the laid position.

[0028] In the door body 11, in the fallen position when the air bag 40 is inflated, one end 11a that receives wave force in the forward wave direction a and the other end 11b that receives wave force in the backward wave direction b are set above the laying member 12. At least the area between each of the ends 11a, 11b and the lower surface 11d that contacts the laying member 12 is formed in a substantially arc shape in side view. Specifically, the lower surface 11d between the one end 11a and the other end 11b is formed in a substantially downward arc shape in side view, and the upper surface 11c is formed in a flat shape (substantially crescent shape).

[0029] The door body 11 is formed into a hollow shape by combining and welding the upper and lower surfaces 11c, 11d and both side surfaces 11e, 11f of stainless steel plates or the like, and this hollow part is filled with an appropriate amount of liquid. As a result, the door body 11 does not generate buoyancy, so it can be installed in a lying position on top of the base member 12.

[0030] Here, FIG. 11 clearly shows the relationship between the door body 11 and the underlay member 12, and omits illustration of other members.

[0031] 11(a), the laying member 12 is made of a generally arc-shaped stainless steel plate or the like having an upper surface 12a, a lower surface 12b fixed to the water bottom 33, and side surfaces 12d, which are welded together and installed in a sealed state, and the inside is filled with liquid or the like so as not to float. The laying member 12 is also provided with through holes 12c through which the supply and exhaust hose 22 and the flexible hose 23 pass.

[0032] As shown in Figure 1, the laying member 12 is installed at the bottom of a recess 33a formed in the water bottom 33, and the door body 11 installed on top of this laying member 12 is set so that the upper surface 11c of the door body 11 in the collapsed position does not protrude significantly above the water bottom 33, so as not to cause any interference with the navigation of the ship 34.

[0033] A plurality of laying members 12 are provided for one door body 11. In this embodiment, as shown in Fig. 2, Fig. 3, and Fig. 11(a), four laying members 12 are provided in order from one end of the door body 11: a first laying member 12A, a second laying member 12B, a third laying member 12C, and a fourth laying member 12D.

[0034] An upper surface 12a of the base member 12, which faces the lower surface 11d of the door body 11, is formed in a generally upward arc shape in side view, and a lower surface 12b of the base member 12 is a generally horizontal rectangular surface.

[0035] As a result, in addition to the gap (elevation angle) f between one end (or the other end 11b) 11a of the door body 11 and the horizontal plane K, a gap (elevation angle) f for the inflow of wave force is naturally formed between the horizontal plane K and the upper surface 12a of the laying member 12, between the underside 11d of each end 11a, 11b of the door body 11 and the upper surface 12a of the laying member 12 (see Figure 11(b)).

[0036] A plurality of (in this example, four at a predetermined interval in the width direction) flexible first fixing belts 4 are provided for the door body 11. One end 4a of the first fixing belt 4 is connected to the vicinity of the upstream end of the laying member 12 in the wave advance direction a, extends along the lower surface 11d of the door body 11, and the other end 4b is connected to the other end 11b of the door body 11.

[0037] The other end 11b of the gate body 11 is supported so as to be able to swing by the first fixing belt 4. The first fixing belt 4 is long enough to allow the gate body 11 to roll under the wave force from the wave advance direction a, and to rise from the lying position to the standing position with the other end 11b in contact with the underlay member 12 as a fulcrum (see FIG. 9(b)).

[0038] A flexible first retaining belt 6 (corresponding to the "first retaining member" in the present invention) is provided at the same position as each of the first fixing belts 4 (it can be shifted in the width direction as in Figs. 1 and 8). One end 6a of this first retaining belt 6 is fixed to the laying member 12 via a first turn drum 6c installed at the end of the laying member 12 on the upstream side in the pushing wave direction a, and the other end 6b is connected to one end 11a of the door body 11.

[0039] The first retaining belt 6 is of a length sufficient to hold the door body 11 in the upright position against the wave force in the upright wave direction a when the door body 11 rolls under the wave force from the upright wave direction a and rises to the upright position.

[0040] One end 4a of the first fixing belt 4 is connected to the laying member 12, and one end 6a of the first retention belt 6 is fixed to the laying member 12 via the first turn drum 6c, but they can also be connected to an anchor block installed on the bottom of the water. The same applies to one end 5a of the second fixing belt 5 and one end 7a of the second retention belt 7, which will be described next.

[0041] A plurality of flexible second fixing belts 5 (in this example, two at a predetermined interval in the width direction) are provided on the door body 11 so as not to overlap with the first fixing belts 4, and one end 5a of each of the second fixing belts 5 is connected to the vicinity of the upstream end of the laying member 12 in the backwash direction b, extends along the underside 11d of the door body 11, and the other end 5b is connected to one end 11a of the door body 11.

[0042] One end 11a of the gate body 11 is supported so as to be able to swing by the second fixing belt 5. The second fixing belt 5 is long enough so that the gate body 11 can roll under the wave force from the backwash direction b and rise from the lying position to the standing position with the one end 11a in contact with the underlaying member 12 as a fulcrum (see FIG. 10(b)).

[0043] A flexible second retaining belt 7 (corresponding to the "second retaining member" in the present invention) is provided at the same position as each second fixing belt 5 (it can be shifted in the width direction as shown in Figs. 1 and 8). One end 7a of this second retaining belt 7 is fixed to the laying member 12 via a second turn drum 7c installed at the upstream end of the laying member 12 in the backwash direction b, and the other end 7b is connected to the other end 11b of the door body 11.

[0044] The second retaining belt 7 is long enough to hold the door body 11 in the upright position against the wave force in the backwash direction b when the door body 11 rolls under the wave force from the backwash direction b and rises to the upright position.

[0045] Instead of the first and second retaining belts 6, 7, it is also possible to provide a stopper member for the door body 11 so as to hold the door body 11 in an upright position against the wave force in the forward wave direction a and to hold the door body 11 in an upright position against the wave force in the backward wave direction b.

[0046] 3 and 4, two first air bags 40A located below one end 11a of door body 11 are provided for each door body 11. Specifically, one first air bag 40A is provided on the water bottom between first laying member 12A and second laying member 12B, and one is provided on the water bottom between third laying member 12C and fourth laying member 12D.

[0047] Further, two second air bags 40B located below the other end 11b of the door body 11 are provided for each door body 11. Specifically, one second air bag 40B is provided on the water bottom between the first laying member 12A and the second laying member 12B, and one second air bag 40B is provided on the water bottom between the third laying member 12C and the fourth laying member 12D.

[0048] The first air bag 40A serves as a stopper that supports the door body 11 from one end 11a, and the second air bag 40B serves as a stopper that supports the door body 11 from the other end 11b. These first and second air bags 40A and 40B prevent the door body 11 from standing up except when necessary.

[0049] Referring to FIG. 6, the air bag 40 is a spherical air bag whose outer periphery is completely closed. air It has a tight structure and is made of a flexible membrane material such as rubber reinforced with synthetic fibers. In this embodiment, a material that becomes spherical when inflated is used. In addition, it is desirable to use air bag 40 that can withstand an internal pressure of at least 0.15 MPa as a strength condition.

[0050] It is desirable that the diameter φ of the inflated air bag 40 (see FIG. 6(a)) is about 1 / 10 of the width T (see FIG. 3) of the door body 11. For example, when the width T of the door body 11 is 13 m, the diameter φ of the air bag 40 is set to about 1.3 m. At this time, it is desirable that the contact width C between the inflated air bag 40 and the door body 11 is about 1000 mm.

[0051] Air bag 40 is placed on a pyramidal base 41 with a square base, and is connected to flexible hose 23. Base 41 has a recess 41a in the center when viewed from above, into which air bag 40 can fit.

[0052] The flexible hose passes through the inside of the base 41 and is connected to a piping chamber 25 installed outside the base 41 .

[0053] When air is supplied to the inside of the air bag 40 and the air bag 40 expands, one end 11a and the other end 11b of the door body 11 are supported by the upper surface of the air bag 40 protruding in an arc shape, and the downward movement of each end 11a, 11b is restricted. This prevents the door body 11 from rising up accidentally, for example, when it receives waves from the ship 34.

[0054] Specifically, when a wave occurs in the up-wave direction a, the second air bag 40B installed in an inflated state below the other end 11b of the door body 11 supports the door body 11 from below, restricting the other end 11b of the door body 11 from moving downward. As a result, the door body 11 cannot tilt sufficiently in the up-wave direction a, and the door body 11 cannot stand up.

[0055] On the other hand, when waves occur in the backwash direction b, the first air bag 40A installed in an inflated state below the one end 11a of the door body 11 supports the door body 11 from below, restricting the one end 11a of the door body 11 from moving downward. As a result, the door body 11 cannot tilt sufficiently in the backwash direction b, and the door body 11 cannot stand up.

[0056] On the other hand, if an earthquake occurs and there is a risk of a tsunami, the air inside the air bag 40 can be exhausted under the control of the control device 27 described below, allowing the door body 11 to rise.

[0057] In this case, since the air bag 40 is not inflated, the door body 11 is not prevented from rising by the air bag 40, and the original purpose of the door body 11, which is to reduce damage caused by a tsunami, can be achieved.

[0058] Next, the details of the air supply and exhaust facility, that is, the mechanism for supplying air to air bag 40 and the mechanism for discharging air from air bag 40 will be described in detail.

[0059] 2, the air supply and exhaust equipment 20 is installed on a hill away from the door body 11. Also, referring to FIG. 5, the air supply and exhaust equipment 20 includes a compressor 21a that discharges air, an air receiver tank 21b that stabilizes the pressure of the air, an air supply hose 21 through which the air discharged from the compressor 21a flows, an air receiver tank 21b, a pressure reducing valve 21c, and an air supply valve 21d provided in the air supply hose 21, an exhaust hose 24 branched from the air supply hose 21, an exhaust valve 24a and an emergency exhaust valve 24b provided in the exhaust hose 24, an exhaust port 24c connected to the downstream end of the exhaust hose 24, a control device 27 that controls the supply and exhaust of air, and a seismometer 28 connected to the control device 27 and that detects the seismic intensity of an earthquake. The intake valve 21d corresponds to the "supply valve" in this invention, the exhaust valve 24a corresponds to the "discharge valve" in this invention, and the emergency exhaust valve 24b corresponds to the "emergency discharge valve" in this invention.

[0060] Air intake hose 21 is disposed so as to extend from compressor 21a to air intake / exhaust hose 22. Between air intake valve 21d and pressure reducing valve 21c in air intake hose 21, pressure gauge 21e for measuring the air pressure after pressure reduction by pressure reducing valve 21c is provided, and between air intake valve 21d and intersection A, pressure gauge 21f for measuring the internal pressure of air bag 40 after air is supplied.

[0061] The exhaust hose 24 extends from the intersection point A and branches into two, one of which is connected to the exhaust port 24c via the exhaust valve 24a, and the other of which is connected to the exhaust port 24c via the emergency exhaust valve 24b. The emergency exhaust valve 24b is equipped with a battery that supplies electricity to the emergency exhaust valve 24b in the event of a power outage.

[0062] The control device 27 is electrically connected to the compressor 21a, the air receiver tank 21b, the pressure reducing valve 21c, the air intake valve 21d, the pressure gauges 21e and 21f, the exhaust valve 24a, the emergency exhaust valve 24b, and the seismometer 28. The control device 27 supplies electricity to and remotely controls each piece of equipment, and receives data from the pressure gauges 21e and 21f and the seismometer 28.

[0063] Next, the mechanism for supplying and discharging air to and from air bag 40 by control device 27 will be described for three cases: normal times when no tsunami has occurred due to an earthquake, when an earthquake occurs, and when a power outage occurs.

[0064] <Normal times> Assume that, in normal times, no tsunami has been generated by an earthquake, but there is a possibility that waves may be generated by ship 34. In this case, control device 27 inflates air bag 40 in the following procedure to prevent door body 11 from rising.

[0065] The control device 27 drives the compressor 21a to discharge air. The discharged air is stored in the air receiver tank 21b. The air stored in the air receiver tank 21b is reduced in pressure to a certain level by the pressure reducing valve 21c.

[0066] The pressure after reduction by the pressure reducing valve 21c is controlled by remotely operating the pressure reducing valve 21c by the control device 27. The pressure after reduction is measured by a pressure gauge 21e installed between the pressure reducing valve 21c and the air intake valve 21d, and is transmitted to the control device 27.

[0067] Control device 27 drives air intake valve 21d in the opening direction while exhaust valve 24a and emergency exhaust valve 24b are closed, thereby starting the supply of air to air bag 40. That is, air intake valve 21d is opened and exhaust valve 24a and emergency exhaust valve 24b are closed, so that air decompressed by pressure reducing valve 21c is supplied to air bag 40 via intake and exhaust hose 22 and flexible hose 23, and air bag 40 inflates.

[0068] Control device 27 receives the pressure measurement value by pressure gauge 21f installed between air intake valve 21d and intersection A, and confirms the completion of air supply to air bag 40 based on fluctuations in this measurement value. When the pressure on pressure gauge 21f indicates a constant value (the value measured by pressure gauge 21e after pressure reduction by pressure reducing valve 21c), this means that air supply to air bag 40 has been completed.

[0069] After confirming that the supply of air to air bag 40 has been completed, control device 27 stops the operation of compressor 21a. Control device 27 also keeps air intake valve 21d closed to maintain the pressure of the air filled in air bag 40. At this time, the inside of air bag 40, the inside of flexible hose 23, the inside of intake and exhaust hose 22, the portion of air intake hose 21 from intersection A to intake valve 21d, and the portion of exhaust hose 24 from intersection A to exhaust valve 24a are all interconnected, so the internal pressures of these are all uniform.

[0070] Control device 27 constantly receives the internal pressure value of air bag 40 measured by pressure gauge 21f, and checks for a decrease in this measured value to determine whether or not there is an air leak in air bag 40. If an air leak occurs and the measured value by pressure gauge 21f falls below a certain value, control device 27 re-fills air bag 40 with air using the same procedure as described above.

[0071] By the control device 27 operating as described above, the air bag 40 is inflated and supports the door body 11 from below as shown in FIG. 7(a), thereby preventing the door body 11 from standing up.

[0072] As a result, the gate body 11 does not rise up due to waves generated when the ship 34 passes, so that damage to the ship 34 caused by contact between the gate body 11 and the ship 34 can be prevented.

[0073] <When an earthquake occurs> When an earthquake occurs, it is assumed that a tsunami will occur due to the earthquake and there is a risk of a tsunami occurring.

[0074] In this case, the control device 27 automatically drives the exhaust valve 24a in the opening direction to exhaust the air filled in the air bag 40, and allows the door body 11 to rise.

[0075] Specifically, the occurrence of an earthquake is detected by a seismometer 28 connected to the control device 27. When the seismometer 28 detects the occurrence of an earthquake with a seismic intensity equal to or greater than a certain level, it transmits data about the earthquake to the control device 27.

[0076] Control device 27 receives earthquake data from seismometer 28 and drives exhaust valve 24a in the opening direction. At the same time, the air inside air bag 40, which has a pressure greater than atmospheric pressure, is naturally pushed out to the outside air through exhaust hose 24. As a result, air bag 40 contracts as shown in FIG. 7(b), and support of door body 11 by air bag 40 is released.

[0077] In the event of a tsunami caused by an earthquake, the control device 27 operates as described above to allow the door body 11 to rise, thereby making it possible to reduce damage caused by the tsunami.

[0078] <During a power outage> In the case of a power outage, it is assumed that a power outage occurs due to an earthquake, and the control device 27 is unable to supply electricity to the exhaust valve 24a, making it impossible to drive the exhaust valve 24a in the opening direction.

[0079] In this case, the battery built into the emergency exhaust valve 24b detects that electricity is no longer being supplied from the control device 27, and automatically supplies electricity to the emergency exhaust valve 24b. When electricity is supplied from the battery, the emergency exhaust valve 24b is automatically driven in the opening direction.

[0080] By operating the emergency exhaust valve 24b in this manner, even if it is impossible to drive the exhaust valve 24a in the open direction due to a power outage, air is automatically exhausted from the air bag 40, allowing the door body 11 to rise.

[0081] Second embodiment The second embodiment of the present invention will be described, focusing on the differences from the first embodiment. In the first embodiment, a case where a derrick-type breakwater device is installed in a place such as a harbor where it is necessary to prevent both incoming waves and outgoing waves will be described, but in this embodiment, a case where a derrick-type breakwater device is installed in a place such as the mouth of a river where it is less necessary to prevent outgoing waves will be described.

[0082] In this case, referring to Figures 2 to 4 and Figures 12 and 13, the first fixing belt 4, the second fixing belt 5 and the first retaining belt 6 are similar to those in the first embodiment, but the second retaining belt 7 is different from that in the first embodiment.

[0083] That is, in the second embodiment, a flexible stopper belt 8 is provided at the same position as each second fixing belt 5. One end 8a of this stopper belt 8 is connected to the vicinity of the upstream end of the underlay member 12 in the backwash direction b, and the other end 8b is connected to the other end 11b of the door body 11 in a straight line.

[0084] The stopper belt 8 is of a length sufficient to prevent the door body 11 from rotating to the left while maintaining it in the fallen position, and to hold it in the fallen position against the wave force in the backwash direction b.

[0085] In the second embodiment, first air bag 40A is not provided below one end 11a of door body 11, and only second air bag 40B is installed below the other end 11b of door body 11.

[0086] In the second embodiment, the number of air bags 40 can be reduced to simplify the structure compared to the first embodiment. In addition, during normal times when no tsunamis are generated due to earthquakes, the second air bag 40B that is inflated by receiving a supply of fluid at the other end 11b and the stopper belt 8 that holds the door body 11 in a collapsed position against the wave force in the backwash direction b can appropriately prevent the door body 11 from rising up due to the wave force in the forward wave direction a and the wave force in the backwash direction b.

[0087] In the second embodiment, unlike the first embodiment, a second turn drum 7c is not installed. However, the second turn drum 7c may be installed on the laying member 12 or the bottom of the water 33, and one end 8a of the stopper belt 8 may be connected to this second turn drum 7c.

[0088] Third embodiment The third embodiment of the present invention will be described with a focus on the differences from the first and second embodiments. In the first and second embodiments, the air bag 40 is a closed air bag. air In the above description, a case has been described in which a dense structure that becomes spherical when expanded is used, but in the third embodiment, the outer periphery is not completely closed. air A case in which air bag 40a having a tight structure and which assumes a dome shape when inflated will be described with reference to FIG.

[0089] Air bag 40a is designed to be approximately semicircular when viewed from the side and dome-shaped when viewed from the front, and has no bottom surface.

[0090] Clamping portion 40b is provided around air bag 40a. Clamping portion 40b is clamped by clamping tool 45 (described later) in a state of intimate contact with sealing rubber 48, which prevents air leakage from air bag 40a. Sealing rubber 48 is a flexible film material reinforced with synthetic fibers, similar to air bag 40a.

[0091] Air bag 40a is fixed to fixing parts 42 provided around the periphery of the upper surface of pedestal 41b, which is a quadrangular pyramid with a rectangular bottom surface. Fixing parts 42 are used to fix air bag 40a to pedestal 41a.

[0092] An uneven surface 41c is formed on the upper surface of base 41b except for fixed portion 42, and the surface area of ​​uneven surface 41c is substantially equal to the surface area of ​​air bag 40a when viewed from the side. With this configuration, the inside of air bag 40a and the upper surface of base 41b come into closer contact with each other when air bag 40a is deflated, thereby reducing the frequency with which drifting objects get caught on air bag 40a and preventing damage to air bag 40a.

[0093] A hole 23a is provided in the center of the upper surface of the base 41a, and a flexible hose 23 is connected to this hole 23a. The flexible hose 23 passes through the inside of the base 41a and extends to the outside of the base 41a.

[0094] Referring to Figure 14 (c), the clamping device 45 is composed of a base plate 46 having a convex portion 46a on its upper surface, a clamping bar 47 having a concave portion 47a corresponding to the convex portion 46a, a bolt 49 that passes through the base plate 46, the clamping bar 47, and the fixed portion 42, and a nut 49a that is screwed onto the bolt 49.

[0095] With this configuration, air bag 40a, the outer periphery of which is not completely closed, can be fixed to base 41a while preventing air leakage.

[0096] Furthermore, air bag 40a in the third embodiment has a larger contact area with door body 11 than the spherical air bag 40 used in the first and second embodiments, and can support door body 11 stably.

[0097] The above-described embodiments are merely examples of preferred embodiments of the present invention, and the present invention is not limited to the above-described embodiments.

[0098] For example, the inside of the door body 11 can be filled with a solid (such as an iron block) instead of a liquid.

[0099] Although the laying member 12 has a through hole 12c through which the supply and exhaust hose 22 and the flexible hose 23 can be passed, the through hole 12c is not essential. For example, a recess can be provided in the underside 12b and the supply and exhaust hose 22 and the flexible hose 23 can be passed through this recess.

[0100] Furthermore, the supply / exhaust hose 22 and the flexible hose 23 may be buried in the water bottom 33 without providing the through hole 12c or the recess.

[0101] The laying member 12 may be shaped so that the space between the upper surface 12a and the lower surface 12b is hollow, and the air supply / exhaust hose 22 and the flexible hose 23 may be passed through this space.

[0102] Each of the belts 4 to 8 used in this embodiment is preferably made of, for example, reinforced rubber, but may also be made of a flexible metal.

[0103] Air bag 40 does not necessarily have to be made of a flexible membrane material such as rubber reinforced with synthetic fibers, and other materials can be used as long as they are flexible and maintain airtightness.

[0104] Furthermore, the medium supplied to the air bag 40 does not necessarily have to be air, and other fluids such as water can be used as long as they can inflate the air bag 40 and prevent the door body 11 from rising.

[0105] In this embodiment, the occurrence of an earthquake is detected by connecting the seismometer 28 to the control device 27 and the exhaust valve 24a is driven in the opening direction, but anything other than the seismometer 28 can be used as long as it can determine the risk of a tsunami occurring. For example, the exhaust valve 24a can be configured to be driven in the opening direction when an emergency earthquake alert or a large tsunami warning is received.

[0106] Needless to say, various other design modifications are possible within the scope of the claims of the present invention. [Explanation of symbols]

[0107] 6 First retaining belt (first holding member) 7 Second retaining belt (second retaining member) 8 Stopper belt (second holding member) 11 Door body 11a One end 11b Other end 11c Top side 11d Bottom surface 12 Laying material 20. Air supply and exhaust equipment (fluid supply and exhaust equipment) 21 Air supply hose 21d Air intake valve (supply valve) 22 Intake and exhaust hose 24 Exhaust hose 24a Exhaust valve (discharge valve) 24b Emergency exhaust valve (emergency exhaust valve) 27 Control Device 28 Seismograph 40A First air bag (first bag body) 40B Second air bag (second bag body) a. Direction of the surge b. Wave backwash direction

Claims

1. A bedding member installed on the bottom of the water; a door body that can swing between a lying position where it falls in a state approximately parallel to the laying member and an upright position where it stands up against the laying member, and in the lying position, one end that receives wave force in the forward wave direction and the other end that receives wave force in the backward wave direction are each set higher than the laying member, and the area between each end and the lower surface that contacts the laying member is formed in an approximately downward arc shape or approximately trapezoid shape in side view; A first holding member that holds the door body in an upright position against wave force in a pushing wave direction; A second holding member that holds the door body in an upright position against wave force in the backwash direction; A first bag body provided below the one end portion and expanding when supplied with fluid to prevent the door body from standing up due to wave force in the backwash direction; A second bag body provided below the other end portion and expanding when supplied with fluid to prevent the door body from rising due to wave force in the wave pushing direction; a fluid supply / drainage facility that supplies a fluid to the first bag and the second bag, or discharges a fluid from the first bag and the second bag; A wave-breaking device comprising:

2. The undulating breakwater device according to claim 1, characterized in that the first bag body and the second bag body have an airtight structure with a closed outer periphery, and expand so that their upper surfaces protrude in an arc shape when supplied with the fluid.

3. The fluid supply and drainage equipment includes: a supply and discharge pipe through which a fluid is supplied to and discharged from the first bag body and the second bag body; a supply valve that is installed in the supply and discharge pipe and that supplies fluid to the first bag body and the second bag body when driven in an opening direction; a discharge valve that is installed in the supply and discharge pipe and that discharges fluid from the first bag body and the second bag body when driven in an opening direction; A control device for controlling the opening and closing operations of the supply valve and the discharge valve; 3. The wave-breaking device according to claim 1 or 2, further comprising:

4. It will also be equipped with a seismometer to detect earthquakes.

4. The wave-breaker according to claim 3, wherein the control device opens the discharge valve when an earthquake is detected by the seismometer.

5. The fluid supply and discharge equipment further includes an emergency discharge valve having a built-in battery; 5. The wave-breaking device according to claim 3, wherein the emergency discharge valve is driven in an opening direction by receiving electricity from the battery when electricity is not supplied from the control device.

6. 6. The wave-breaking device according to claim 1, wherein the retaining member is a belt having elasticity or flexibility.

7. A bedding member installed on the bottom of the water; a door body that can swing between a lying position where it falls in a state approximately parallel to the laying member and an upright position where it stands up against the laying member, and in the lying position, one end that receives wave force in the forward wave direction and the other end that receives wave force in the backward wave direction are each set higher than the laying member, and the area between each end and the lower surface that contacts the laying member is formed in an approximately downward arc shape or approximately trapezoid shape in side view; A first holding member that holds the door body in an upright position against wave force in a pushing wave direction; A second holding member that holds the door body in a collapsed position against wave force in the backwash direction; A bag body provided below the other end portion and expanding when supplied with fluid to prevent the door body from rising due to wave force in the pushing wave direction; A fluid supply and discharge device that supplies a fluid to the bag body or discharges a fluid from the bag body; A wave-breaking device comprising:

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