JP5644386B2 - Tsunami storm surge mitigation structure - Google Patents

Description

  The present invention relates to a tsunami storm surge mitigation structure for suppressing disasters caused by tsunami and storm surge.

  As shown in FIG. 16, a general tide wall and chest wall are configured as a wall body 50 that separates the land area of the coast 100. However, the wall body 50 hinders effective use of the entire land area. Moreover, the visibility from the coast 100 to the sea area is hindered by the wall body 50, resulting in a decrease in landscape value. In order to prevent these problems, if the wall body 50 is laid down during normal times and a means for raising the wall body 50 only in the event of an emergency such as a tsunami or storm surge is to be constructed, a drive device for operating the wall body 50, Human operation is required. In addition, when driving devices are used, power is also required to drive them, and in the event of an emergency such as a tsunami or storm surge, it is dangerous for people to approach the coast and it needs to be improved. is there.

  Therefore, Patent Document 1 describes a facility for preventing disasters caused by storm surges, etc., a support column installed on land, a roof / waterstop body rotatably attached to the support via a fulcrum, The tide is constructed with a rotational force imparting device that rotates the roof and still water surface around the fulcrum, and the roof and still water surface can be installed in the direction of the storm surge by rotating around the fulcrum. The facility is disclosed.

JP2007-224598

  However, in the invention relating to the tide facilities of Patent Document 1, although the coastal land area can be used effectively, there is no electric power or human operation for driving the rotational force applying device that rotates the roof and waterstop. It becomes necessary and the above-mentioned problem cannot be solved.

  The present invention has been made in view of such points, and an object thereof is to provide a tsunami storm surge mitigation structure that can suppress a disaster during a tsunami or a storm surge without requiring a driving device or a human operation. And

As a means for solving the above-mentioned problems, the present invention provides a tsunami storm surge mitigation structure installed in a sea area or a coast, wherein the tsunami storm surge mitigation structure is a A body portion having a space as a chamber and having an opening formed in a wall portion facing the waves, and a undulating ceiling end wall provided at the top end of the body portion so as to be able to undulate so as to face the waves Between the undulating end wall part and the main body part, normally, a sealing means for ensuring a sealing property between the two is provided, the undulating end wall part is The stand-up operation is started as the air pressure in the water reserving chamber rises .
According to the first aspect of the present invention, the undulating end wall portion is maintained in a normal state during normal times. On the other hand, in the event of an emergency such as a tsunami or storm surge, the undulating heavens are caused by wave force (water pressure) and air pressure from the reclaimed water chamber of the main body. If the undulating end wall portion is in the maximum standing state while the end wall portion is erected, the undulating end wall portion can suppress the arrival of waves to the land area.
In addition, since a sealing means is provided between the undulating end wall and the main body to ensure the sealing between the two at normal times, the air pressure in the recreational water chamber increases due to high waves such as tsunami and storm surge. Along with this, the standing response of the undulating end wall portion is improved.

The invention described in claim 2 is characterized in that, in the invention described in claim 1, a regulating means for regulating the standing position of the undulating top end wall portion is provided.
In the invention of claim 2, since the standing state of the undulating end wall portion can be maintained by the restricting means, the arrival of waves to the land area can be suppressed.

The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, control means for controlling the falling speed of the undulating end wall portion is provided.
In the invention of claim 3, when the undulating end wall portion moves from the undulating state to the overturned state, the impact between the undulating end wall portion and the main body portion can be suppressed.

  According to the invention relating to the tsunami storm surge mitigation structure of the present invention, since the hill top wall is maintained in a normal state during normal times, for example, when the tsunami storm surge mitigation structure is installed along the coast, The entire coastal land area and the top of the undulating end wall can be used effectively, and the view from the coastal area to the sea area is good, improving the landscape value. In the event of an emergency such as a tsunami or storm surge, the undulating end wall is raised by the wave force and air pressure from the water reservoir in the main body, and the wave reaches the land by the undulating end wall. Can be suppressed and disasters can be suppressed.

FIG. 1 is a schematic cross-sectional view of a tsunami storm surge mitigation structure according to an embodiment of the present invention. FIG. 2 is a schematic perspective view of the tsunami storm surge mitigation structure according to the embodiment of the present invention. FIG. 3 is a schematic perspective view of the hinge portion of the tsunami storm surge mitigation structure. FIG. 4 is a schematic perspective view of the sealing means of the tsunami storm surge mitigation structure. FIG. 5 is a schematic diagram of the regulating means according to the first embodiment of the present tsunami storm surge mitigation structure. FIG. 6 is a schematic diagram of the regulating means according to the second embodiment of the present tsunami storm surge mitigation structure. FIG. 7 is a schematic view of the regulating means according to the third embodiment of the present tsunami storm surge mitigation structure. FIG. 8 is a schematic view of the regulating means according to the fourth embodiment of the present tsunami storm surge mitigation structure. FIG. 9 is a schematic diagram of the control means according to the first embodiment of the present tsunami storm surge mitigation structure. FIG. 10 is a schematic diagram of the control means according to the second embodiment of the present tsunami storm surge mitigation structure. FIG. 11 shows the operation of the tsunami storm surge mitigation structure in stages. FIG. 12 shows experimental data of the Tsunami storm surge mitigation structure. FIG. 13 shows experimental data of the Tsunami storm surge mitigation structure. FIG. 14 is an enlarged view of a main part of another embodiment of the tsunami storm surge mitigating structure shown in FIG. FIG. 15 is a schematic cross-sectional view of the tsunami storm surge mitigation structure installed in the sea area. FIG. 16 is a view showing a wall body as a conventional tide wall or chest wall.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
As shown in FIGS. 1 and 2, the tsunami storm surge mitigation structure 1 according to the embodiment of the present invention has a main body 3 having a space as a reclaimed water chamber 2 inside, and a top end of the main body 3. It is comprised from the undulation top end wall part 5 provided so that undulation was possible via the hinge part 4. As shown in FIG. FIG. 1 shows a state in which the tsunami storm surge mitigation structure 1 is installed along the coast 100. Specifically, as shown in FIG. 1, a concrete base base plate 16 is disposed on a trapezoidal foundation mound 15 provided from the sea floor near the coast 100 to the inside of the coast 100, and the base base plate 16. This tsunami storm surge mitigation structure 1 is installed above. Hereinafter, for convenience of explanation, the sea side will be described as the front side, and the land side will be described as the rear side.

  As shown in FIG. 1 and FIG. 2, the main body 3 is a rectangular parallelepiped and is formed in a box shape having a space as the water reserving chamber 2 inside. A rectangular opening 7 is provided in the front wall 6 of the main body 3 facing the waves. The opening 7 is formed in the lower part of the front wall 6. The length in the width direction of the opening 7 has a width corresponding to the entire width of the front wall 6 (the length along the coast 100), and the height is approximately half the total height of the main body 3. However, the height of the opening 7 is not limited to this embodiment. And the main-body part 3 is arrange | positioned so that the wall 8 may contact | abut to the coast 100 after that. The bottom wall 9 of the main body 3 is configured in a block shape in which a filling material 17 is packed in a concrete box.

  The entire top end of the main body 3 is provided with a undulating top end wall 5 that can be raised and lowered with a hinge 4 provided at the upper end of the rear wall 8 of the main body 3 as a fulcrum. When the undulating end wall portion 5 is erected with the hinge portion 4 as a fulcrum, the undulating end wall portion 5 comes to face the waves. The undulating top end wall portion 5 is plate-shaped and is formed in a substantially rectangular shape so as to open and close the top end opening of the main body portion 3. In the present embodiment, the undulating end wall portion 5 is formed by reinforcing the outer frame with a steel material 10 such as H steel and casting concrete 11 therein as shown in FIG. If the desired strength is ensured, the present invention is not limited to this form.

  As shown in FIG. 3, the hinge portion 4 has a plurality of U-shaped locking portions 12 provided at intervals on the upper end of the rear wall 8 of the main body portion 3, and a rear end portion of the undulating end wall portion 5. It comprises a through-hole 13 extending in the width direction provided, and a steel shaft 14 inserted through the through-hole 13 in the undulating end wall portion 5 and the U-shaped locking portion 12 provided in the main body portion 3. In addition, at the rear end portion of the undulating end wall portion 5, an engagement concave portion 20 to which each U-shaped locking portion 12 provided in the main body portion 3 is engaged corresponds to each U-shaped locking portion 12. Formed in each position. A through hole 13 extending in the width direction is formed in each convex portion 21 adjacent to each engaging concave portion 20. In the present embodiment, the steel shaft 14 is employed as the configuration of the hinge portion 4, but the present invention is not limited to this configuration as long as a desired strength is ensured.

And each engagement recessed part 20 provided in the rear-end part of the undulation end wall part 5 is engaged with each U-shaped latching | locking part 12 with which the upper end of the rear wall 8 of the main-body part 3 was engaged, and the undulation top Steel shafts 14 are attached to the through-holes 13 extending in the width direction provided in the respective convex portions 21 adjacent to the respective engagement concave portions 20 of the end wall portion 5 and the respective U-shaped locking portions 12 provided in the main body portion 3. Insert. As a result, the undulating end wall portion 5 can rotate around the shaft 14 at the upper end of the rear wall 8 of the main body portion 3 (with the hinge portion 4 as a fulcrum). A rubber mat cover 22 is attached to the hinge portion 4 so as to cover the hinge portion 4. The mat cover 22 can suppress water leakage from the hinge portion 4 when the undulating end wall portion 5 stands up.
In addition, it is necessary to devise each U-shaped latching | locking part 12 so that it may not protrude from the upper surface of the undulation end wall part 5. FIG. Thereby, the upper surface of the undulating end wall portion 5 can be effectively utilized.

As shown in FIG. 4, a sealing means 24 is provided between the undulating end wall portion 5 and the front wall 6 of the main body portion 3 and the upper surfaces of the side walls 23, 23 to ensure the sealing between them. Provided.
The sealing means 24 includes a cylindrical elastic member 25 such as a synthetic rubber provided on the undulating end wall 5 side, and a block shape such as a synthetic rubber provided on the front wall 6 and the side walls 23 and 23 side of the main body 3. And an elastic member 26. The cylindrical elastic member 25 is suspended from the inner lower surface of the outer frame of the undulating end wall portion 5 in a range where the front wall 6 of the main body 3 and the upper surfaces of the side walls 23 and 23 are in contact with each other. On the other hand, the block-like elastic member 26 is provided in a recess 27 provided on the front wall 6 of the main body 3 and the upper surfaces of the side walls 23 and 23. The block-like elastic member 26 has a rectangular cross section and extends linearly. On the upper surface of the block-like elastic member 26, there is an engagement recess 28 that engages with the cylindrical elastic member 25 provided on the undulating end wall 5 side. Formed.

When the undulating end wall portion 5 falls on the front wall 6 of the main body portion 3 and the upper surfaces of the side walls 23, 23, the cylindrical elastic member 25 provided on the undulating end wall portion 5 side becomes the main body portion. In order to press and closely contact the bottom of the engaging recess 28 of the block-shaped elastic member 26 provided on the 3 side, the undulating top end wall 5 and the front wall 6 of the main body 3 and the upper surfaces of the side walls 23, 23 Sealing between is ensured.
The cylindrical elastic member 25 provided on the undulating end wall portion 5 side and the block-like elastic member 26 provided on the main body portion 3 side have the undulating ending end wall portion 5 and the front wall 6 of the main body portion 3 and It functions also as a buffer means for suppressing the impact when it falls on each side wall 23,23.

Moreover, in the tsunami storm surge mitigation structure 1 which concerns on embodiment of this invention, either of the control means 30a-30d which concerns on the 1st-4th embodiment which regulates the standing position of the undulation end wall part 5 is provided. Adopted. Below, the control means 30a-30d which concerns on 1st-4th embodiment is demonstrated.
First, as shown in FIG. 5, the restricting means 30 a according to the first embodiment includes a first rod-like member 31 having one end fixed to the undulating end wall portion 5 side, and the other end of the first rod-like member 31. One end of the second bar-shaped member 32 is connected to the upper portion of the side wall 23 of the main body 3. The undulating end wall portion 5 is in the overturned state when the first rod-shaped member 31 and the second rod-shaped member 32 move in a direction approaching each other with the connection position 36 as a fulcrum, while the first rod-shaped member 31 and When the second rod-shaped member 32 is linearly arranged, the maximum standing state is obtained. The first rod-shaped member 31 and the second rod-shaped member 32 are provided on both sides of the undulating end wall portion 5 in the width direction.

  Next, as shown in FIG. 6, the restricting means 30 b according to the second embodiment includes a stopper member 35 on the upper surface of the side wall 23 or the rear wall 8 of the main body 3 at a position rearward of the hinge portion 4. Configured. Then, when the undulating end wall portion 5 stands up and abuts against the stopper member 35, the undulating top end wall portion 5 can be prevented from falling to the land side. Two stopper members 35 are provided on both sides in the width direction of the undulating end wall portion 5.

  Next, as shown in FIG. 7, the restricting means 30c according to the third embodiment includes the first rod-like member 31 and the second rod-like member 32 employed in the restricting means 30a according to the first embodiment, The first rod-shaped member 31 and the second rod-shaped member 32 comprise a third rod-shaped member 33 whose one end is pivotally coupled in the vicinity of the coupling position 36. The other end of the third rod-shaped member 33 is supported on the upper portion of the side wall 23 of the main body 3 so as to be movable in the front-rear direction. Moreover, when the 1st rod-shaped member 31 and the 2nd rod-shaped member 32 become linear form in the upper part of the side wall 23 of the main-body part 3, and the undulation top end wall part 5 arrives at the maximum standing position, it will be 3rd rod-shaped. A lock portion (not shown) that prevents the other end of the member 33 from moving is formed.

  In this embodiment, when the undulating end wall portion 5 reaches the maximum standing position, the other end of the third rod-shaped member 33 is locked by the locking portion, and therefore the undulating end wall portion 5 Can be fixed at the maximum standing position. When the undulating end wall portion 5 is laid down, the operator removes the other end of the third rod-shaped member 33 from the lock portion of the main body portion 3 to lie down the undulating end wall portion 5. The first rod-shaped member 31, the second rod-shaped member 32, and the third rod-shaped member 33 are respectively provided on both sides in the width direction of the undulating top end wall portion 5.

  Next, as shown in FIG. 8, the restricting means 30d according to the fourth embodiment includes the first and second rod members 31 and 32 employed in the restricting means 30a according to the first embodiment, and the undulations. It consists of the 4th rod-shaped member 34 by which one end is rotatably connected with the end wall part 5 side. The other end of the fourth rod-shaped member 34 is supported on the upper portion of the side wall 23 of the main body 3 so as to be movable in the front-rear direction. The connection position of the fourth rod-shaped member 34 with the undulating top end wall portion 5 is set behind the connection position of the first rod-shaped member 31 and the undulating top end wall portion 5. Moreover, when the 1st rod-shaped member 31 and the 2nd rod-shaped member 32 become linear form in the upper part of the side wall 23 of the main-body part 3, when the undulation end wall part 5 arrives at the maximum standing position, it will be 4th rod-shaped. A lock portion (not shown) that prevents the other end of the member 34 from moving is formed.

  In this embodiment, like the regulating means 30c according to the third embodiment, when the undulating end wall portion 5 reaches the maximum standing position, the other end of the fourth rod-shaped member 34 is the locking portion. Therefore, the undulating end wall portion 5 can be fixed at the maximum standing position. When the undulating end wall portion 5 is laid down, an operator removes the other end of the fourth rod-shaped member 34 from the lock portion of the main body portion 3 so that the undulating ending end wall portion 5 is laid down. The first rod-shaped member 31, the second rod-shaped member 32, and the fourth rod-shaped member 34 are respectively provided on both sides in the width direction of the undulating top end wall portion 5.

Furthermore, the tsunami storm surge mitigating structure 1 according to the embodiment of the present invention includes any one of the control means 40a and 40b according to the first or second embodiment that controls the falling speed of the undulating top end wall portion 5. It can also be adopted. That is, the control means 40a and 40b according to the first and second embodiments are not indispensable and are employed only when it is determined to be necessary. The control means 40a and 40b according to the first and second embodiments will be described below.
First, as shown in FIG. 9, the control unit 40 a according to the first embodiment includes a damper device provided between the rear upper surface of the side wall 23 of the main body 3 and the rear end of the undulating end wall 5. 41.

  The damper device 41 includes, for example, a cylinder 41a filled with hydraulic fluid, a piston (not shown) that slides in the cylinder 41a in the axial direction and defines the cylinder 41a in two chambers, The piston rod 41b, one end of which is connected to the piston and the other end protruding from the cylinder 41a, does not give flow resistance to the flow between the two chambers of the hydraulic fluid during the extension stroke of the piston rod 41b. A valve portion (not shown) that provides resistance to the flow of the hydraulic fluid between the two chambers only during the contracting stroke is provided. The bottom of the cylinder 41 a is fixed to the top of the side wall 23 of the main body 3, and the tip of the piston rod 41 b is fixed to the lower surface of the undulating end wall 5. The damper devices 41 are respectively provided on both sides in the width direction of the undulating end wall portion 5.

  As a result, when the undulating end wall portion 5 is erected by wave force and air pressure, the undulating end wall portion 5 can be erected without receiving any external resistance, but the wave force or the like is lost. When the rear undulation end wall 5 falls down, the damper device 41 can control (reduce) the falling speed.

Next, as shown in FIG. 10, the control means 40 b according to the second embodiment is configured by a float 42 that is disposed on substantially the entire bottom surface of the undulating end wall portion 5. The float 42 is formed of a block body having a triangular cross section. The float 42 has a first apex portion 42a (set at an angle θ1: 45 ° or less) on the front side, and an adjacent side 42d having a length next to the hypotenuse 42c has an undulating end wall portion 5 It arrange | positions so that it may contact | abut on the lower surface of. As a result, the second top portion 42b of the float 42 (angle θ2: set within a range of 45 ° to 90 °) is disposed at a position closest to the sea surface.
In the present embodiment, the float 42 is disposed over substantially the entire lower surface of the undulating end wall portion 5, but may be partially disposed in the width direction. For example, two locations may be provided on both sides in the width direction of the undulating end wall portion 5, or one location may be provided near the center in the width direction.

  And when the undulating end wall portion 5 stands up by wave force and air pressure, the undulating end wall portion 5 can stand up without receiving any resistance from the outside. When the undulating end wall portion 5 falls after it has disappeared, it is possible to control (reduce) the falling speed by the buoyancy of the float 42. Further, when the float 42 is employed, when wave force and air pressure are applied from the lower surface of the undulating end wall part 5, the rising of the undulating end wall part 5 can be promptly started.

Next, the operation of the tsunami storm surge mitigating structure 1 according to the embodiment of the present invention will be described with reference to FIG.
In normal times, as shown in FIG. 11 (a), the hill top wall portion 5 of the tsunami storm surge mitigating structure 1 is maintained, and the hill top wall portion 5 and the main body portion 3 are sealed by the sealing means 24. The airtightness between the front wall 6 and the upper surfaces of the side walls 23 and 23 is ensured.
Next, when a high wave such as a tsunami or a storm surge occurs, as shown in FIG. The undulating top end wall portion 5 springs up by wave force (water pressure) and air pressure, and rises up with the hinge portion 4 as a fulcrum. At this time, since the sealing means 24 ensures the space between the undulating end wall portion 5 and the front wall 6 of the main body portion 3 and the upper surfaces of the side walls 23, 23, the inside of the water chamber 2 caused by high waves. As the air pressure rises, the undulating end wall portion 5 starts to stand up quickly.

After that, as shown in FIG. 11 (c), even when the waves are continuously pushed, the rising and falling end wall portion 5 is maintained in the standing state by the regulating means 30a to 30d according to the first to fourth embodiments. Since the wave collides with the rising and falling end wall portion 5 and returns to the sea side, the wave is prevented from flowing backward (land side) from the main body portion 3.
When the high waves such as tsunami and storm surge have subsided, the undulating end wall portion 5 falls down by the first or second control means 40a, 40b while its falling speed is suppressed, and the front wall 6 of the main body portion 3 is lowered. And it mounts on the upper surface of each side wall 23 and 23, and returns to the state of Fig.11 (a).

  FIG. 12 and FIG. 13 show experimental data by the tsunami storm surge mitigation structure 1. In FIG. 12, the dotted line indicates the rear of the main body 3 when the undulating end wall 5 is fixed to the main body 3 ( The amount of water inundation with respect to time to the land side) indicates the main tsunami storm surge mitigation structure 1, that is, the main body when the undulating end wall 5 is configured to be freely undulated with the hinge 4 as a fulcrum 3 shows the amount of wave inundation with respect to time backward. As can be seen from the experimental results, in the tsunami storm surge mitigation structure 1, it takes time for the water level to rise from the main body 3 to the rear and the water level to rise (increase the inundation amount). It can be seen that there is a reduction and disaster reduction effect.

Further, in FIG. 13, the vertical axis represents the tsunami storm surge mitigation structure 1, that is, the undulation top end wall portion 5 is undulated with the hinge portion 4 as a fulcrum when the undulation top end wall portion 5 is fixed to the main body 3 The horizontal axis shows the overtopping rate when the structure is freely configured, and the horizontal axis shows the water depth h / at the structure position, following the overtopping flow estimation chart used to calculate the overtopping flow when designing a general harbor structure. The converted offshore wave height H ₀ ′ (the estimated wave height at the offshore where the wave reaching the structure is deep enough) is shown. As can be seen from the results of this experiment, all the data are generally distributed in the range of the overtopping rate from 0 to 0.2, and it can be seen that the overtopping amount is reduced by the tsunami storm surge mitigation structure 1.

  As described above, in the tsunami storm surge mitigation structure 1 according to the embodiment of the present invention, since the hill top wall 5 is maintained in a normal state, the tsunami storm surge mitigation structure 1 is, for example, As shown in FIG. 1, when installed along the coast 100, the entire land area of the coast 100 and the upper surface of the undulating end wall portion 5 can be effectively utilized. Moreover, since there is nothing on the coast 100 that obstructs the field of view, the field of view from the coast 100 to the sea area is good and the landscape value is improved.

  On the other hand, in the event of an emergency such as a tsunami or storm surge, the undulating end wall 5 is erected by the wave force (water pressure) and air pressure from the inside of the water reserving chamber 2 of the main body 3, and the undulating end wall of the standing state 5 can suppress the arrival of waves to the land. Moreover, since the tsunami storm surge mitigation structure 1 does not require a drive device or human operation for raising the undulating end wall 5, the total cost from installation cost to maintenance cost can be greatly reduced. it can.

  In addition, the tsunami storm surge mitigation structure 1 according to the embodiment of the present invention includes the control means 40a and 40b for controlling the overturning speed of the undulating end wall portion 5, so The falling speed when the wall portion 5 falls down can be reduced, and damage due to the collision between the undulating end wall portion 5 and the main body portion 3 can be suppressed.

  In addition, in the tsunami storm surge mitigation structure 1 according to the present embodiment, the undulating end wall portion 5 is provided in a undulating manner over the entire top end of the main body portion 3, but as shown in FIG. A top end wall 60 having an opening 60a may be provided at the top of the top, and a undulation top end wall 5a that can be undulated via the hinge 4a is provided in the opening 60a of the top end wall 60. . In this embodiment, flanges 61 and 61 are provided to project on both sides in the width direction of the undulating end wall 5a, and the total width including the ridges 61 and 61 of the undulating end wall 5a matches the entire width of the main body 3. It is better to let them. Further, when the undulating end wall portion 5a is fallen over, the upper and lower ridge end walls are arranged on the upper surface of the celestial end wall portion 60 so that the upper surface of the undulating heaven end wall portion 5a and the upper surface of the celestial end wall portion 60 coincide with each other. Concave portions 62 and 62 are formed in which the flange portions 61 and 61 extending from both sides of the portion 5a are accommodated. Although the details of the hinge part 4a in this embodiment are not shown, for example, the hinge part 4a is formed in the through hole extending in the width direction at the rear end of the undulating top end wall part 5a and the opening part 60a of the top end wall part 60. A steel shaft can be inserted into each through hole provided on the opposite wall portions so as to face the through hole of the undulating end wall portion 5a. Thereby, the undulation top end wall portion 5a is configured to be undulated freely from the opening 60a of the top end wall portion 60 via the hinge portion 4a.

  Further, when the tsunami storm surge mitigation structure 1 according to the embodiment of the present invention is installed in the sea area, as shown in FIG. 15, the filling material 17 is packed in the concrete box made of a rectangular parallelepiped. The support 45 is installed on the rear upper surface of the base base plate 16 on the base mound 15 provided on the seabed so that the rear wall 8 of the main body 3 of the tsunami storm surge mitigation structure 1 is in contact with the front of the support 45. The tsunami storm surge mitigation structure 1 is installed on the upper surface of the base base plate 16.

  DESCRIPTION OF SYMBOLS 1 Tsunami storm surge mitigation structure, 2 Reservoir room, 3 Main part, 4, 4a Hinge part, 5, 5a Ridge end wall part, 6 Front wall (wall part), 7 Opening part, 24 Sealing means, 30a-30d Restriction Means, 40a, 40b control means, 100 coast

Claims (3)

Tsunami storm surge mitigation structure installed in sea area or coast,
The tsunami storm surge mitigation structure is
A body portion having a space as a water reserving chamber inside and having an opening formed in a wall portion facing the waves;
The undulation top end wall portion provided at the top end of the main body portion and configured to be freely undulated so as to face the waves,
Consisting of
Between the undulating end wall portion and the main body portion, a sealing means for ensuring a sealing property between the two is normally provided,
A tsunami storm surge mitigating structure characterized in that the undulating end wall portion starts a standing operation as the air pressure in the recreational water chamber increases .   The tsunami storm surge mitigation structure according to claim 1, further comprising a restricting means for restricting a standing position of the undulating end wall portion.   The tsunami storm surge mitigation structure according to claim 1 or 2, further comprising a control means for controlling a falling speed of the undulating end wall portion.

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