JP5919598B2 - Emergency protective device - Google Patents

Description

  The present invention relates to an emergency protective device installed on a protective bank such as a breakwater or a seawall.

  For example, breakwaters are used to protect harbors and fishing villages safely from waves, and as they are, the height from the sea level is generally not sufficient as it is, and safety is sufficient when a large tsunami exceeding the expected height strikes. Not secured. Therefore, what was disclosed by the prior art document is proposed.

  JP2005-315058

  The thing of patent document 1 is about an emergency protective device, and is against the tsunami which strikes over a breakwater, but since the height is fixed, when a high tsunami comes I can't deal with it enough.

  The present invention is intended to solve such a problem, and an object of the present invention is to provide an emergency protective device that can sufficiently cope with a high tsunami.

In order to achieve the above-mentioned object, the present invention according to claim 1 is arranged so as to extend vertically and at a certain interval on a breakwater such as a breakwater or a tide wall having a front surface, a back surface, and a ceiling. A plurality of support members having a pair of guide bars are fixedly arranged at intervals with respect to the longitudinal direction of the protective bank, and the longitudinal direction of the support members is arranged so that the longitudinal direction is between the front and rear of the guide bars. A plurality of upper and lower protective tension members are passed in a vertically movable state, and a buoyancy generating means that is a float is provided around each protective tension member, and a plurality of protective tension members are provided between the protective tension member and the protective embankment. Anchor ropes are provided to regulate the flying height so that the tensioning materials are spaced apart from each other, and a plurality of these protective tensioning materials with buoyancy generating means are lowered during normal times, but are floated when a tsunami strikes. An emergency protective device configured to float along the guide bar by buoyancy generated by the generating means, wherein a plurality of the support members are arranged such that their lower portions are positioned on the front side of the front surface of the protective dam, All of the plurality of protective tension members are set to a height lower than the top edge of the front surface.

As described above, the present invention provides a support member having a pair of guide bars in front and rear so as to extend vertically and at a certain interval to a breakwater such as a breakwater or a tide wall having a front surface, a back surface, and a top end. A plurality of fixed tensioning members are arranged at intervals with respect to the longitudinal direction of the protective dam, and a plurality of upper and lower protective tension members can move up and down between the front and rear of the guide bars of these support members so that the longitudinal direction is in the longitudinal direction. The buoyancy generating means that is a float is provided around each protective tensioning material, and a plurality of protective tensioning materials are spaced apart from each other between the protective tensioning material and the protective bank. Anchor ropes that regulate the flying height are deployed, and several of these protective tensioning members with buoyancy generating means are lowered during normal times, but the buoyancy generated by the buoyancy generating means during the tsunami strikes the guide bar A plurality of the support members, the lower portions of which are positioned on the front side of the front surface of the protective levee, and all of the plurality of protective tensioning members in normal times. However, since the height is set lower than the top edge of the front surface, it is possible to provide an emergency protection device that can sufficiently cope with a high tsunami.

  The top view which shows one Embodiment of this invention.   The front view of FIG.   The AA line expanded sectional view of FIG.   The front view which shows the state at the time of the tsunami attack about embodiment of FIG.   The side view which shows other embodiment.   The cross-sectional view which shows other embodiment.   The cross-sectional view which shows other embodiment.   The front view of the normal state which shows other embodiment.   Action explanatory drawing of FIG.   The top view which shows other embodiment.   The front view of FIG.   BB sectional drawing of FIG.   The top view of FIG. 14 which shows other embodiment.   FIG. 14 is a front view of FIG. 13.   CC sectional drawing of FIG.   The top view which shows other embodiment.   The top view of FIG. 18 which shows other embodiment.   The front view of FIG.   The DD sectional view taken on the line of FIG.   The front view which shows other embodiment.   The front view which shows other embodiment.   The perspective view which shows the other example of a proposal.   The perspective view which shows the other example of a proposal.   The top view which shows embodiment of stilt type apartment houses, such as tsunami-resistant, flood, and storm surge.   The side view of the facility of FIG.   The front view of the facility of FIG.   The front view which shows the reinforcement method of a housing part.

Hereinafter, an embodiment of the present invention will be described.
Each plan described in each embodiment can be applied to other related embodiments.
1 to 4, reference numeral 1 denotes a breakwater that is a breakwater, which is constructed on the offshore side of the harbor, and there are existing ones and new ones. The protective bank 1 includes a front surface 2, a top end 3, and a back surface 4.

  The protective levee 1 is longer than the illustrated range, but a part of about 20 to 30 m is illustrated for convenience. On the top end 3 of the protective bank 1, support members 5 are arranged in a plurality of rows at regular intervals in the longitudinal direction. Each support member 5 is composed of a seat bar 6 and a pair of front and rear guide bars 7 and a stopper stopper 8. The guide bar 7 is a metal round pipe, and the front and rear are separated by a certain size. A plate-like stopper 8 is fixed between the upper ends of the guide bars 7 by welding.

  These support members 5 are arranged in the longitudinal direction of the protective bank 1 with a few m intervals, and are fixed vertically by fastening the seat plate 6 to the anchors 9. Numeral 10 is a protective tension member which is a wire rope, and a plurality of three are prepared, and each of them is equipped with a plurality of floats 11 which are buoyancy generating means so as to float by the tsunami attack. As shown in the upper left column of FIG. 1, a roller 12 and a fixed piece 13 are inserted and attached to both ends of the tension member 10 by fastening devices 14.

  The rollers 12 are respectively inserted between the front and rear guide bars 7 of the support member 5 at the end so as to be able to move up and down. The protective tensioning member 10 is lifted and lowered without the roller 12 with respect to the support member 5 in the middle, but as shown in the upper column of FIG. Also good. In this case, the fixed piece 13 may be omitted by using only the roller 12. The support member 5 may be welded and fixed to the upper end of a front guard 16 anchored to the front surface 2 via a mounting plate 15 as shown in FIG. Also, anchor ropes 17, which are long and short, are attached to the lowermost one and the upper one of the protective tension member 10, and their lower ends are fixed to the upper surface 2.

When the tsunami hits the protective levee 1 as shown by the arrow X in FIG. 3, buoyancy acts on the floats 11. As a result, as shown in the side sectional view of the right column of FIG. 3 and the front view of FIG. 4, the protective tensioning material 10 is lifted by the rollers 12 at both ends guided by the guide bar 7. The middle and lowermost protective tension members 10 are restrained from being lifted more than a certain amount by the respective anchors 9 so as to float at equal intervals. It performs the same function as described above when a tsunami is triggered.
For a tsunami X higher than that, as shown by the phantom line in the right column of FIG. 3, the auxiliary guide bar 18 comes out of the guide bar 7 to a certain height limit, so that the stopper stopper 8 rises and the uppermost stage The roller 12 may also be able to rise with it.
The front guard 16 functions to effectively prevent the support member 5 from being damaged by drowning material such as a ship and to ensure the lifting action of the protective tension member 10. The intermediate support member 5 other than the both ends may be omitted.

As the guide bar 7, a square pipe can be used as shown in the left column of FIG. Further, as shown in FIG. 5, the stopper stopper 8 can be formed as an integral part of the guide bar 7 by bending.
Furthermore, the support member 5 may be attached in a slanting and tilting posture in accordance with the slight inclination of the front surface 2 as shown in the right column of FIG. In this case, 19 is an installation plate, 20 is a back support material, and the installation plate 19 is fixed to both the front surface 2 and the upper surface 3 with a single letter in a side view. Two sheets may be fixed to the front surface 2 and the upper surface 3 separately. Thus, if the support member 5 is made to stand up from the front surface 2, the upper surface 3 can be widely used as a walking surface.
In addition, as shown in FIG. 6, the support member 5 may be formed in a side-shaped shape in correspondence with the fact that there is a protective bank 1 with the front surface 2 being vertical, or may be formed in a vertical shape like a virtual line.
Further, as shown in FIG. 7, the guide bar 7 may be an H-shaped steel, and may be configured to be opposed to the front and rear to constitute the support member 5. In this case, if the front guide bar 7 is made larger than the rear side as shown in the right column of FIG. Ascending movement can be performed without resistance. This (making the front side a large size) can be similarly applied to the guide bar 7 shown in the upper left column of FIG. 1 and the left column of FIG.
In the embodiment shown in FIGS. 1 to 7, the side reinforcing member 21 can be supplemented to the end portion of the support member 5.
Further, the protective tension member 10 may be a link chain, a rod (including a pipe), a chain, a rope, or the like.

  8 and 9 show another embodiment. Reference numeral 25 denotes a protective bank, 26 denotes an end support member, 27 denotes an end-to-end support member, 28 denotes a side reinforcing member, 29 denotes a protective tension member, 30 denotes a float (buoyancy generating means), and the end support member 26 includes 1 On the other hand, the end support member 27 is composed of a pair of front and rear guide bars as shown in FIG. Both ends of the protective tension member 29 are connected to the end support member 27 at connection points 31, and the connection points 31 are set to about half the height of the end support member 26. A midway portion of the protective tension member 28 is passed between the front and rear guide bars of the end-to-end support member 27 so as to be freely raised and lowered.

  FIG. 8 shows a state in a normal state, and the protective tension member 29 with the float 30 hangs down like a bow between the front and rear of the end-to-end support member 26. On the other hand, when a tsunami strikes, as shown in FIG. 9, buoyancy acts on the floats 30. . It performs the same function during pulling. In addition, as shown with a virtual line in FIG. 9, you may arrange | position the protection tension | tensile_strength material 29 in multiple steps up and down.

  10 to 12 show another embodiment. In the embodiment, a fixed frame 38 having a mountain shape (inverted V shape) is disposed oppositely on a seat plate 37 fixed on the protective bank 36 by a fastening device 35, and the fixed frame 38 has a fixed frame 38. Are provided with a plurality of upper and lower stages of receiving plates 39, and a plurality of stages of protective tension members 40 are stretched using these receiving plates 39 to prepare for a tsunami. A bulging portion 41 protruding front and rear is formed, and the bulging portion 41 can support the fixed frame 38 more strongly. Since the bulging portion 41 protrudes, the front-rear width of the fixed frame 38 can be increased, and as a result, the resistance force of the fixed frame 38 is increased.

  13 to 15 show another embodiment of the protective bank. As shown in FIG. 15, the protective bank 43 of the same embodiment includes a front bank body 44 having an original bank function and a rear bank body 45 having a pedestrian surface. 46 is a front surface, 47 is a top end, 48 is a rear surface, 49 is a rear upper surface, and 50 is a rear surface.

  On the front surface 46 of the protective dam 43, for example, three seat plates 52 are spaced apart and fixed by a fastening member 53. The seat plate 52 is disposed at both the left and right ends in FIGS. 13 and 14 and an intermediate position thereof, and the distance between both ends is, for example, 20 to 30 m. The seat plate 52 is similarly arranged on the right and left sides of the seat plate 52 shown in the solid line in the figure. However, the guard plate 43 may be composed of only one pair of seat plates 52 at both ends of the diagram, or between the pair and The seat plate 52 may be composed of one or a plurality of midway position seat plates 52. Hereinafter, the seat plates 52 at both ends may be referred to as end seat plates, and the intermediate seat plate may be referred to as an intermediate seat plate.

  Although the upper end of each seat plate 52 is substantially the same height as the top end 47, it may be lower or higher. A horizontal plate-shaped receiving plate 54 projects from the front surface of the seat plate 52, and on each seat plate 52, a pair of guide bars 55 made of a square or a round pipe, as shown in FIG. The upper end of the guide bar 55 is set to be equal to or slightly higher than the top end 47, and a stopper is provided between the upper ends of the front and rear guide bars 55. It is open. The guide bar 55 may be higher than the top end 47 of about 1 to 1.5 m as indicated by a virtual line in FIG. Reference numeral 56 denotes a front reinforcing plate, and 57 denotes a lower reinforcing plate.

  Reference numeral 60 denotes a protective tension member such as a wire rope or a link chain. The protective tension member 60 has a length exceeding 20 to 30 m, and may be one, but a plurality of three is provided here. The protective tensioning member 60 is allowed to pass between the guide bars 55, and can be raised and lowered between the guide bars 55 by the end roller 61 and the middle roller 62, and the end portion is fastened by the end stopper 63. Yes.

  A float 64 is attached to the outer periphery of the protective tension member 60. In addition, the end portion of the protective tension member 60 is hung with a connecting member 65 that is sufficiently longer than the upper and lower parts of the upper and middle stages and the upper and lower parts, respectively, so that the vertical distance can be expanded, and the anchor connected to the lower stage. The material 66 is long suspended and its upper end is connected to a fixed anchor fixture 67. The connecting material 65 and the anchor material 66 are preferably chain materials such as link chains and plate chains that are easily bent.

During normal times, as shown in FIG. 13 to FIG. 15, the protective tension member 60 is in a state of being housed between the lower portions of the guide bars 55, and is visible from the sea side but not from the land side. When the tsunami X strikes, buoyancy acts on the floats 64, and the protective tensioning material 60 is lifted, and the rollers 61 and 62 roll, so that the protective tensioning material 60 floats lightly, as shown by the arrows in FIG. It comes out of the guide bar 55. As shown in FIGS. 13 and 15, the protective tension member 60... Spreads above the protective dam 43 as a result of the force of the tsunami X. At this time, the anchor member 66 and the connecting member 65 are held by the anchor fixture 67. And, along with the tsunami X, a drifting object such as a ship crosses the protective dam 43, and these drifting objects are caught by the protective tensioning material 60. As a result, the drifting object is retained and does not flow further to the land side, and the safety of the land-side housing is improved.
As indicated by phantom lines in FIG. 15, the guide bar 55 may be fixed vertically or obliquely rearward from the back surface 50. The emergency protection devices for the back surface 50 and the front surface 46 can be provided on either one or both.

FIG. 16 shows another embodiment. In this embodiment, the seat plate 52 and the guide bar 55 are firmly reinforced through the reinforced portion 70 formed and reinforced on a part of the front surface 46 of the protective bank 43. And is equipped with the protective tension member 60 as described above.
In addition, as shown with a virtual line, the protruding part 70 may be provided in the back side, and may be further reinforced.

17 to 19 show another embodiment. In the embodiment, an upper protruding ridge 72 that is separated in the longitudinal direction on the front levee body 44 of the protective dam 43 is integrally formed in a trapezoidal shape, and the seat plate 52 and the guide bar are interposed via the upper protruding ridge 72 and the front surface 46. Equipped with 55 and a protective tensioning member 60 and the like, the device is fixed by a solid support so that moorings such as drifting objects can be reliably performed.
The guide bar 55 can be extended higher than shown. Further, a stopper can be provided at the upper end of the guide bar 55. The stopper includes both a stopper that prevents the protective tension member 60 from being pulled out and a stopper that is pulled out only when a certain level of pulling force is applied. In the latter case, a leaf spring or elastic rubber is added.

FIG. 20 (a front view from the sea side) shows another embodiment, in which the seat plates 52 are fixed to the front surface 46 of the front bank body 44 and are bowed to the seat plates 52 via the anchors 74. A plurality of protective tensioning members 60 that hang down are provided in the vertical direction, and a float 64 is attached to the protective tensioning material 60 to form a protective tensioning material 60 that is supported at both ends. The float 64 can be formed into a bulge shape or a spherical shape as shown in the lower column of FIG.
When a tsunami comes, buoyancy is generated in the float 64 and the protective tensioning member 60 is lifted, and they move around after the front levee body 44 to stop drifting objects there.
Although the anchor 74 is a fixing point, as shown in the lower right column of the figure, a lateral guide rail 75 is fixed to the seat plate 52, and a traveling piece with a roller 76 is attached to the guide rail 75. 77 is provided in a temporarily fixed state, and an end of the guide rail 75 is connected to the end of the guide rail 75 via a fixed guide stopper 78, and the end of the protective tensioning member 60 is connected to the piece 77 in a symmetrical manner. Can also be configured. In this case, when the buoyancy caused by the tsunami acts on the float 64, the protective tensioning member 60 is lifted upward, and at the same time, the roller 76 travels inward along the guide rail 75. You will be able to capture your drifting objects there. A plurality of protective tension members 60 may be used. Further, the protective tension member 60 may hang down and stand by like a virtual line.

FIG. 21 shows another embodiment. In the embodiment, the receiving piece 80 is arranged between the seat plates 52 and both ends of the protective tensioning member 60 with the float 64 are fixed to the seat plate 52, and the middle portion is received by the receiving piece 80 as shown in the figure. It is drooped greatly.
When a tsunami comes, buoyancy is generated in the float 64 and the protective tensioning member 60 is lifted, and they move around after the front levee body 44 to stop drifting objects there.
Note that the traveling device using the guard rail 75 and the roller 76 shown in the lower right column of FIG. 20 can also be applied to the anchor 74 of FIG.

  FIG. 22 shows another embodiment viewed from the sea side. 84 is a sluice (or tide door), and a drive source 86 for opening and closing the sluice 84 is installed on the gate housing 85. The drive source 86 is switched so as to be manually opened and closed to cope with a power failure due to an earthquake. Before the tsunami hit after the earthquake, the person in charge of the closing operation created a tragedy swallowed by the tsunami. Therefore, this embodiment is provided to eliminate the need for such a closing operation. That is, on the offshore, a displacement member 87 such as an elastically deformable rubber pipe is erected, and an operation float 88 that is pushed toward the shore by the tsunami X is installed at the upper end of the member 87. The interlocking wire 90 which is wound around the pulley 89 and the terminal is fixed is interlocked in the direction of the shore. The interlocking wire 90 is connected to the sluice 84 so that the lock of the sluice 84 can be unlocked.

FIG. 23 shows another embodiment. In this embodiment, the buildings 93 such as houses lined up on the coastline are prevented from being damaged or floated by a direct hit by the tsunami X that has passed over the breakwater 94. At several locations in the longitudinal direction of the breakwater 94, recessed portions 95 are formed so that the tsunami X partially flows earlier and delays as a whole. In addition, a flow guide bank 96 is erected on the front side of the building area so as to offset the partial flow and further delay the flow. The guide bank 59 is installed slightly obliquely with respect to the breakwater 54.
In addition, as shown in the upper column of FIG. 23, adjacent ones of the recessed portions 95 may be inclined so that the left and right tsunamis X are easily hit. In this case, when the tsunami X passing through the notches 95 and 95 flows over the breakwater 94, it collides with each other and decays, and it takes time for the collision. Increases the safety of people who run away.

  FIGS. 24 to 27 show examples of stilt type housing systems for measures against tsunamis, floods, storm surges, etc., which are installed in coastal areas where tsunami strikes, the plains that follow, and other areas where attacks are expected. Reference numeral 300 denotes an installation base. In this example, the base 300 is a coastal flat land through which the roadway 302 passes before the seawall 301, and the base 300 is provided with a concrete base. Reference numeral 303 denotes a support (steel pipe pile) for forming an elevated floor, and a round or square pipe, an angle, a grooved steel, an H-shaped steel, etc. can be widely used. Here, it is a round pipe column 303. U is a high-floor unit, and a plurality of pairs of left and right columns 303 are arranged in the front and rear to form a total of eight columns 303.

  At the height of H (10 to 13 m) of these columns 303, the downstairs stage 304 is laid through an in-plane floor construction (not shown), and at the height of h above (about 3 m) Similarly, an installation stage 305 is laid through an in-plane floor structure (not shown). A staircase 307 is provided between the downstairs stage 304 and the installation stage 305 through a portion that does not obstruct the passage of the vehicle 306. In front of the unit U, a buffer pile 308 is fixed to be opposed to each other on the left and right sides to prevent drowning objects such as a ship from hitting the column 303 and the like. A reinforcing member 309 is provided between the buffer pile 308 and the unit U. In addition, a curved droplet receiving plate 310 is attached to the upper front surface of the unit U in order to prevent seawater droplets due to tsunami and storm surge.

  As shown in FIG. 25, a side wall 312 and a brace 313 are provided between the front and rear support columns 303 to reinforce, or a counter mesh 314 is stretched between the left and right support columns 303 as shown in FIG. May be. However, in this embodiment, the side walls 312, braces 313, mesh 314 and the like are not provided, and the space between the columns 303 is made as open as possible to make it easy for tsunamis and torrents to pass through.

  Houses 315... Are fixedly arranged on the installation stage 305 of the unit U. The house 315 may be a structure for the purpose of an office, a store, a factory, a warehouse, or the like, and the structure may be a wooden structure, a steel frame, a concrete structure, or the like. Furthermore, it is not necessary to construct them individually as shown in the figure, and may be a continuous type, for example, an apartment house or a condominium. In addition, two units on the left and right sides of the unit U are arranged here and connected between them by a rooftop road surface body 316 to form another large unit. On the front side of both units U, the installation base 300 and the rooftop road surface body are arranged in the normal time. An elevator tower 317 is provided for evacuating on the roof road surface 316 in the event of an emergency such as a tsunami attack. The elevator tower 317 has a mountain shape in the first half to be separated when a tsunami strikes. A semi-circle may be sufficient. A front buffer pile 318 may be erected on the seawall 301. The buffer pile 318 and the buffer pile 308 may be connected by a connecting beam 319.

  Furthermore, a slope 320 that connects between the installation base 300 and the downstairs stage 304 is provided around the outer periphery of both units U. This slope 320 is for climbing the vehicle 306 for people who live in the housing 315 installed in this unit during normal times, but in the event of an emergency such as a tsunami, the regular vehicle 306 from the roadway 302 is also climbed. It is possible. The slope 320 is provided with water passing portions 320a such as a mesh through which a tsunami flow passes and a horizontal rail over several stages. This water flow part 320a may be arranged in a staggered manner. The slope 320 includes an upper slope 321 and can be climbed up and down also on the roof road surface body 316. In FIG. 25, reference numeral 323 denotes an evacuation tower, which is provided with a lightning rod 324, and can be evacuated to another evacuation place by a secondary evacuation device 325. 326 is a water storage tank that can be used in an emergency. Reference numeral 311 denotes a sidewalk slope, which is provided on the side of the slope 320 in a form separated from the roadway slope by a handrail 311a.

  In such a high-floored housing system, in particular, the installation stage 305 and the downstairs stage 304 have openings 350 at the same position vertically. The opening 350 is rectangular, but may be polygonal, round or other shapes. The vent 350 facilitates daylighting from above and draws air from below the floor upwards in summer. In addition, when the tsunami X strikes, it also works to escape partly upward.

  The slope 320 may be provided below the downstairs stage 304 as shown in FIG. In this case, the slope 320 is provided with a part or the entire surface of the water passing portion 320a to prevent tsunami. The slope 320 is provided so as to be lowered forward (sea side), but may be provided so as to be lowered rearward. In the case of being provided so as to be lowered rearward, if a water flow portion 320a is provided, a tsunami flow passes through and the vehicle 306 cannot climb, so a plate-like road surface is provided.

  In FIG. 27, the house 315 is installed on an installation stage 305 in which a base surface material 332 is laid on a girder floor structure 331, and the foundation foundation 333 of the house 315 is made of channel steel or a square pipe. A structure which is fixedly attached to the base surface material 332 or the girder floor structure 331, and which forms the pillar 334 and the girder member 335 via the base foundation 333, and which is not reinforced by the brace 336 and is provided with the outer wall 337. In this case, a buffer pile 338 is erected and fixed to an external corner of the house 315, and a reinforcing corner bracket 340 provided on an arm 339 extending from the buffer pile 338 is attached to the house 315 side to cause an earthquake / tsunami. It is a countermeasure. Note that the roof 343 equipped with the solar panel 342 may be covered with a protective mesh 344 as a measure against tsunami and storm surge.

  In the embodiment of FIG. 27, a ventilation duct 351 is provided at a location corresponding to the bottom of the base material 332 under the house 315 so as to communicate with the indoor main duct 352, and at the lower end of the ventilation duct 351, By providing the air intake port 353 that can take in air flowing through the floor below, indoor ventilation is possible. In addition, a floor lid 354 is provided on a desired floor surface of the house 315 so that the container 355 can be lifted from the lower floor through the opening. The container 355 is used when a purchased product is placed in the house and brought into the house, or when a product from the house is hung down and placed in a car parked downstairs. Reference numeral 356 denotes a simple winch.

  DESCRIPTION OF SYMBOLS 1 ... Protective embankment 5 ... Support member 10 ... Protective tension material 11 ... Float (buoyancy generating means).

Claims (1)

A supporting member with a pair of guide bars extending in the vertical direction and at a certain interval on a breakwater such as a breakwater or tidewall with a front and back and a crest is installed in the longitudinal direction of the breakwater. A plurality of fixed tension members are arranged at intervals, and between the front and rear of the guide bars of these support members, a plurality of upper and lower protective tension members are passed in a vertically movable manner so that the longitudinal direction is in the longitudinal direction. An anchor rope that has buoyancy generation means that is a float around the protective tensioning material, and that defines the flying height so that a plurality of protective tensioning materials are spaced apart from each other between the protective tensioning material and the protective embankment The buoyancy generating means with a plurality of protective tensioning materials are lowered during normal times, but when the tsunami strikes, the buoyancy generating means lifts along the guide bar. The plurality of support members are arranged such that their lower portions are positioned on the front side of the front surface of the protective levee, and all of the plurality of peacetime protective tension members are installed on the front ceiling. An emergency protective device characterized by being set to a height lower than the end .

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