Airbags used in airbag systems for ground structures

Abstract

The present invention provides an airbag for use in an airbag system for ground structures, which has a configuration that can be easily applied to existing ground structures and effectively reduces the impact of tsunamis on those ground structures. [Solution] The airbag 11 is used in an airbag device 1 for ground structures that cushions the impact of a tsunami collision on a ground structure 100, and when deployed it covers at least a portion of the tsunami impact surface of the ground structure 100, and is composed of a plurality of bag bodies 21 arranged in a predetermined direction.

Description

Technical Field

[0001] The present invention relates to an airbag used in an airbag device for above-ground structures such as houses.

Background Art

[0002] Various techniques for reducing the impact of tsunamis on above-ground structures such as houses have been proposed conventionally. For example, in Patent Document 1, on top of a foundation structure constructed on the ground, a buoyancy chamber is placed with its perimeter surrounded by steel plates and its floor part closed with a steel plate in a grid pattern, and a foamed polystyrene foam is fitted inside, and a single-story house is constructed on top of the buoyancy chamber so as to be integrated with the buoyancy chamber. In the case of this single-story house, during normal times, people can utilize it as a dwelling, while during the occurrence of a tsunami, it can float on the water surface due to the buoyancy chamber, thus reducing the impact of the tsunami.

[0003] Also, in Patent Document 2, a structure is disclosed that includes a foundation slab buried in the ground, a floor slab arranged vertically above the foundation slab to support a building, and a link mechanism arranged in the space between the foundation slab and the floor slab to move the floor slab vertically up and down. In the case of this structure, by operating the link mechanism, the building can be moved above the water surface during water disasters such as tsunamis, thus reducing the impact of the tsunami.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, since it is difficult to apply the above-mentioned buoyancy chamber and link mechanism to existing ground structures, there is a need for a technology that can be easily applied to existing ground structures.

[0006] This invention has been made in view of the above circumstances, and its main purpose is to provide an airbag for use in an airbag system that can be easily applied to existing ground structures and can reduce the impact of tsunamis on such ground structures. [Means for solving the problem]

[0007] To solve the above problems, an airbag used in an airbag device for a ground structure according to one aspect of the present invention is an airbag used in an airbag device for a ground structure that cushions the impact of a tsunami collision on the ground structure, and when deployed, covers at least a part of the tsunami impact surface of the ground structure and is composed of a plurality of bag bodies arranged in a predetermined direction.

[0008] In the above embodiment, the plurality of bags may be connected to one another.

[0009] Furthermore, in the above embodiment, the multiple elongated rectangular bags extending in one direction may be connected to each other in the width direction.

[0010] Furthermore, in the above embodiment, the plurality of elongated rectangular bags extending in one direction may be connected to each other in the thickness direction.

[0011] Furthermore, in the above embodiment, each of the bags is composed of two overlapping sheets, and the peripheral edges of the two sheets may be attached to each other.

[0012] Furthermore, in the above embodiment, each of the bags may be composed of a single folded sheet, and the overlapping peripheral edges of the sheet may be adhered to each other.

[0013] In addition, in the above aspect, the plurality of bag bodies may be interconnected by a binding member.

[0014] In addition, in the above aspect, the plurality of bag bodies may be interconnected by overlapping and adhering their peripheral edges to each other.

[0015] In addition, in the above aspect, each of the bag bodies may be provided with a vent hole for leaking the air inside the airbag to the outside when a tsunami collides.

Advantages of the Invention

[0016] According to the present invention, it is possible to effectively reduce the impact of a tsunami on the existing ground structure with a configuration that can be easily applied to the existing ground structure.

Brief Description of the Drawings

[0017] [Figure 1] Side view schematically showing the basic configuration of the airbag device. [Figure 2A] Front view schematically showing an example of the configuration of the airbag device. [Figure 2B] Front view schematically showing another example of the configuration of the airbag device. [Figure 2C] Front view schematically showing another example of the configuration of the airbag device. [Figure 3A] Front view showing an example of the configuration of the bag body. [Figure 3B] Cross-sectional view taken along the line A-A in FIG. 3A. [Figure 4A] Front view showing another example of the configuration of the bag body. [Figure 4B] Cross-sectional view taken along the line B-B in FIG. 4A. [Figure 5A] Front view for explaining an example of the configuration of the connecting means of the bag body. [Figure 5B] Front view for explaining another example of the configuration of the connecting means of the bag body. [Figure 6A] Front view for explaining another example of the configuration of the connecting means of the bag body. [Figure 6B]Side view for explaining another example of the configuration of the connecting means of the bag body. [Figure 7A] Front view showing an example of the configuration of the bag body 21 in which ventilation holes are formed. [Figure 7B] Front view showing another example of the configuration of the bag body 21 in which ventilation holes are formed. [Figure 8] Block diagram showing the configuration of the airbag device. [Figure 9] Side view schematically showing the configuration of the always-installed type airbag device 1. [Figure 10A] Side view schematically showing the configuration of the emergency-installed type (underground arrangement method) airbag device before airbag deployment. [Figure 10B] Side view schematically showing the configuration of the emergency-installed type (underground arrangement method) airbag device after airbag deployment. [Figure 11A] Side view schematically showing the configuration of the emergency-installed type (roof arrangement method) airbag device before airbag deployment. [Figure 11B] Side view schematically showing the configuration of the emergency-installed type (roof arrangement method) airbag device after airbag deployment. [Figure 12A] Side view schematically showing the configuration of other embodiments of the emergency-installed type (underground arrangement method) airbag device before airbag deployment. [Figure 12B] Side view schematically showing the configuration of other embodiments of the emergency-installed type (underground arrangement method) airbag device after airbag deployment. [Figure 13A] Side view schematically showing the configuration of other embodiments of the emergency-installed type (roof arrangement method) airbag device before airbag deployment. [Figure 13B] Side view schematically showing the configuration of other embodiments of the emergency-installed type (roof arrangement method) airbag device after airbag deployment.

Embodiments for Carrying out the Invention

[0018] Preferred embodiments of the present invention will be described below with reference to the drawings. The embodiments described below are illustrative examples of methods and apparatus for realizing the technical concept of the present invention, and the technical concept of the present invention is not limited to those described below. Various modifications can be made to the technical concept of the present invention within the technical scope described in the claims.

[0019] (Basic configuration of an airbag system) The airbag system of this embodiment is an airbag system used in various above-ground structures built on the ground. A typical example of such an above-ground structure is a house built on the ground in an area that may be affected by tsunamis.

[0020] Figure 1 is a schematic side view showing the basic configuration of the airbag device of this embodiment. As shown in Figure 1, the airbag device 1 includes an airbag 11 composed of a bag 21 that inflates when air is supplied to it. The airbag 11 is installed on the side of the ground structure (hereinafter simply referred to as "structure") 100 facing the sea. In the example shown in Figure 1, the height of the airbag 11 is slightly smaller than that of the structure 100, but this is not the only option, and the height of the airbag 11 may be the same as or greater than that of the structure 100.

[0021] The arrows in Figure 1 indicate the direction of travel of a tsunami caused by an earthquake or other event. The airbag 11 is installed so as to cover at least a portion of the side of the structure 100 facing the sea, i.e., the tsunami impact surface, when deployed as the bag 21 inflates.

[0022] (Airbag configuration) Figures 2A to 2C are schematic front views showing examples of the configuration of the airbag device 1. The airbag 11 may consist of a single bag 21 as shown in Figure 2A, or it may consist of multiple bag 21 connected to each other as shown in Figures 2B and 2C. Here, Figure 2B shows an example in which multiple elongated rectangular bag 21 extending in the vertical direction are connected to each other in the horizontal direction, and Figure 2C shows an example in which multiple elongated rectangular bag 21 extending in the horizontal direction are connected to each other in the vertical direction.

[0023] In the examples shown above, the bag 21 is rectangular in shape when viewed from the front, but it is not limited to this. The bag 21 may be circular or have other shapes, as long as it can cover at least a portion of the tsunami impact surface of the structure 100.

[0024] The configuration shown in Figures 2B and 2C is an example of a configuration in which multiple elongated rectangular bags 21 extending in one direction are interconnected in the width direction. Of course, multiple bags 21 of other shapes may also be interconnected in the width direction.

[0025] (Structure of the bag) Next, the detailed structure of the bag 21 will be explained using the elongated bag 21 shown in Figure 2B as an example. Figure 3A is a front view showing the structure of the bag 21, and Figure 3B is a cross-sectional view taken along the line AA in Figure 3A. The bag 21 is composed of two elongated sheets 22 and 23 of the same shape made of rubber material. The peripheral edges 22a and 23a of the sheets 22 and 23 are bonded to each other with adhesive. This forms the bag 21, which is an elastic bag. Then, air is injected into the internal space 24 of the bag 21, causing the bag 21 to inflate and a deployed airbag 11 is obtained.

[0026] In addition, the bag body 21 may be composed of a single sheet body instead of two sheets body as described above. Figure 4A is a front view showing the configuration of such a bag body 21, and Figure 4B is a cross-sectional view taken along the line BB in Figure 4A. In this case, the bag body 21 is composed of a single elongated sheet body 25 made of rubber material. The sheet body 25 is folded in the middle in the short direction, and the overlapping peripheral edges 25a, 25a are bonded together with adhesive. This forms a bag-shaped elastic body, the bag body 21, and when air is injected into the internal space 24 of the bag body 21, a deployed airbag 11 is obtained.

[0027] The material of the bag 21 is not limited to the rubber material described above; the bag 21 may be made of other elastic materials. Examples of such materials include synthetic resins such as polyvinyl chloride (PVC) and polyethylene (PE). Furthermore, the material of the bag 21 may be reinforced with fibers or the like.

[0028] Furthermore, the adhesion of the peripheral edges of the sheet bodies constituting the bag 21 may be achieved by means other than adhesive. For example, the peripheral edges of the overlapping sheet bodies may be adhered together by a rectangular frame-shaped pressing member that clamps the edges from the outside. In this case, the pressing member may be made of, for example, metal, synthetic resin such as fiber-reinforced plastic (FRP), or a rubber material with relatively high hardness.

[0029] As shown in Figures 2B and 2C, when multiple bags 21 are connected to each other in the width direction, various types of connecting means can be used. The configuration of the connecting means will be explained below using the case where three bags 21 shown in Figure 3A are connected as an example.

[0030] Figures 5A and 5B are front views illustrating an example of the configuration of the connecting means for the bag bodies 21. In the example shown in Figure 5A, multiple eyelets 31 are arranged side by side on the longitudinal peripheral edges 22a and 23a of the bag body 21, and a fastening member 32 such as a string or cable tie is passed through each of these eyelets 31, thereby connecting adjacent bag bodies 21, 21 in the left-right direction in the figure. In this case, the distance between the internal spaces 24, 24 of each bag body 21, 21 can be adjusted by adjusting the length of the fastening member 32.

[0031] Furthermore, in the example shown in Figure 5B, adjacent bags 21 in the left-right direction are connected by overlapping the longitudinal peripheral edges 22a and 23a of each bag 21 and then bonding them together with adhesive. In this case, the distance between the internal spaces 24 and 24 of each bag 21 can be adjusted by adjusting the size of the overlapping area of ​​the peripheral edges 22a and 23a.

[0032] As described above, multiple bag bodies 21 may be connected to each other in the thickness direction rather than in the width direction. Figures 6A and 6B are a front view and a side view illustrating an example of the configuration of the means for connecting the bag bodies 21 in that case. In the example shown in Figure 6A, eyelets 33 are provided at each corner of the peripheral edges 22a, 23a of the bag body 21. Then, as shown in Figure 6B, multiple bag bodies 21 are arranged in their thickness direction (left-right direction in the figure), and a fastening member 34 such as a string or cable tie is passed through each eyelet 33 to connect adjacent bag bodies 21, 21 in the thickness direction. In this case, by providing a locking member (not shown) that fixes the eyelet 33 at a predetermined position on the fastening member 34, the distance between the internal spaces 24, 24 of each bag body 21, 21 can be adjusted and fixed.

[0033] The configuration shown in Figures 6A and 6B is an example of a configuration in which multiple elongated rectangular bags 21 extending in one direction are interconnected in the thickness direction. Of course, multiple bags 21 of other shapes may also be interconnected in the thickness direction.

[0034] Furthermore, the multiple bags 21 may be connected to each other not only in the width direction and the thickness direction, but also in both directions. Also, the multiple bags 21 do not need to be connected to each other; they may simply be arranged in a predetermined direction. For example, the multiple bags 21 may be arranged side-by-side in either the width direction or the thickness direction without being connected to each other.

[0035] The internal space 24 of the bag 21 may be sealed, or it may have vents to allow air from the internal space 24 to leak out. These vents have the function of releasing the pressure inside the internal space 24 of the bag 21 when a tsunami hits the airbag 11. This interferes with the impact on the structure 100, thereby preventing or mitigating damage and destruction to the structure 100.

[0036] Figures 7A and 7B are front views showing the configuration of the bag body 21 in which the ventilation holes described above are formed. In the example shown in Figure 7A, the central part of the upper, shorter peripheral edges 22a and 23a of the overlapping sheet bodies 22 and 23 is not adhered. This creates a ventilation hole 41 that connects the internal space 24 of the bag body 21 to the outside. In the example shown in Figure 7B, a region 42 is provided near the center of the peripheral edges 22a and 23a that is not adhered up to the vicinity of the periphery. Therefore, the vicinity of the adhered periphery becomes a weak point 43. When a tsunami collides with the airbag 11, the impact causes the weak point 43 of the bag body 21 to spread outwards towards the periphery and reach the periphery, thereby creating a ventilation hole similar to the ventilation hole 41 described above. The configuration of the weak point 43 can be appropriately adopted by adjusting the adhesive width and / or adhesive strength.

[0037] As described above, the airbag 11 is composed of one or more bag bodies 21, and is deployed when air is supplied to the bag bodies 21. Air can be supplied to the bag bodies 21 by various means. For example, an air supply hole (not shown) communicating with the internal space 24 is provided in a predetermined area of ​​the bag body 21, and air is supplied to the internal space 24 of the bag body 21 from the air supply hole by an air supply unit such as a compressor, cylinder, or blower. As a result, the airbag 11 is deployed and, as shown in Figure 1, covers the tsunami impact surface of the structure 100 in an inflated state.

[0038] Furthermore, if the airbag 11 is formed by multiple bag bodies 21 being connected to each other, at least some of the internal spaces 24 of those bag bodies 21 may be in communication with each other.

[0039] Next, the configuration of the airbag device 1 will be explained with reference to the block diagram in Figure 8. As shown in Figure 8, the airbag device 1 comprises an airbag 11 composed of a bag body 21 as described above, a deployment unit 51 that deploys the airbag 11, and a prediction unit 61 that predicts the arrival of a tsunami and outputs a signal to the deployment unit 51.

[0040] The deployment unit 51 is equipped with an air supply unit 52, such as the compressor described above, and the air supply unit 52 inflates the bag body 21 by supplying air into the internal space 24 of the bag body 21. The supply of air by the air supply unit 52 is performed when the prediction unit 61 predicts the arrival of a tsunami on the ground structure 100.

[0041] In normal circumstances, the airbag 11 is not installed on the structure 100. In the event that the airbag 11 is installed on the structure 100 in an emergency when a tsunami is predicted, the deployment unit 51 includes an installation unit 53 for installing the airbag 11 in that emergency. After the airbag 11 is installed by this installation unit 53, air is supplied to the bag body 21 by the air supply unit 52. The specific configuration of the deployment unit 51 will be described later.

[0042] The prediction unit 61 is a device equipped with a communication unit 62 that acquires tsunami warnings and advisories, and predicts the arrival of a tsunami to the structure 100 based on the acquired tsunami warnings and advisories and the location of the structure 100 where the airbags 11 are installed. If the arrival of a tsunami is predicted, the prediction unit 61 outputs a signal to that effect to the deployment unit 51. Alternatively, the prediction unit 61 may be equipped with a detection means for detecting seismic motion, and may predict the arrival of a tsunami to the structure 100 based on the detection results.

[0043] The airbag device 1 does not necessarily have to have a prediction unit 61. In that case, the arrival of a tsunami will be predicted manually based on tsunami warnings and advisories, and the deployment unit 51 will operate accordingly.

[0044] Next, the specific configuration and operation of the airbag system 1 will be described according to the installation method of the airbag 11. The airbag 11 is broadly classified into two types: a permanently installed type that is permanently installed on the structure 100, and an emergency-installed type that is installed on the structure 100 in emergencies when a tsunami is predicted. Furthermore, the emergency-installed type is divided into an underground installation method in which the airbag 11 is placed underground when not in an emergency, and a rooftop installation method in which it is placed on the roof of the structure 100. The following describes in detail each of these permanently installed types and emergency-installed types (underground installation method and rooftop installation method).

[0045] (1) Permanently installed type Figure 9 is a schematic side view showing the configuration of a permanently installed airbag device 1. Note that the prediction unit 61 is omitted from the illustration in Figure 9. The omission of the prediction unit 61 is also the same in subsequent drawings. As shown in Figure 9, the airbag device 1 comprises an airbag 11 installed to cover the impact surface of the structure 100, and an air supply unit 52 that supplies air to the airbag body 21 of the airbag 11. The airbag 11 and the air supply unit 52 are connected by an air supply pipe 71, and air is supplied from the air supply unit 52 to the airbag 11 via this air supply pipe 71. Note that while Figure 9 shows an example where the air supply unit 52 is installed on the roof of the structure 100, the air supply unit 52 may also be installed on the ground or underground.

[0046] In the example shown in Figure 9, no air is supplied to the bag 21 of the airbag 11. In this state, if the prediction unit 61 predicts the arrival of a tsunami to the structure 100, the air supply unit 52 activates, causing the bag 21 of the airbag 11 to inflate and the airbag 11 to deploy.

[0047] Furthermore, when installing the airbag 11 on the tsunami impact surface of the structure 100, the air supply unit 52 may be used to inflate the bag 21 and deploy the airbag 11. In this case, the deployed airbag 11 will cover the tsunami impact surface of the structure 100 not only in emergencies but also in normal times.

[0048] (2)Emergency installation type (underground placement method) Figures 10A and 10B are schematic side views showing the configuration of an emergency-installation type (underground-mounted) airbag device 1. Figure 10A shows the configuration before the airbag 11 is deployed, and Figure 10B shows the configuration after the airbag 11 is deployed. As shown in Figure 10A, an underground storage unit 81 is provided near the structure 100, and under normal circumstances, the airbag 11 is stored in the storage unit 81. In the example shown in Figure 10A, the airbag 11 is stored rolled up, but it may be stored in other configurations, such as folded. The lower end of the airbag 11 is fixed to the storage unit 81.

[0049] The storage compartment 81 houses the airbag 11 along with the air supply unit 52. The airbag 11 and the air supply unit 52 are connected within the storage compartment 81 by an air supply pipe 71, and air is supplied from the air supply unit 52 to the airbag 11 via this air supply pipe 71.

[0050] A winch 83 for winding up a wire 82 connected to the upper end of the airbag 11 is installed on the roof of the structure 100. This winch 83 is an example of an installation part 53 that constitutes the deployment part 51, and by winding up the wire 82 and pulling the airbag 11 upwards, it installs the airbag 11 against the tsunami impact surface of the structure 100.

[0051] In the airbag device 1 configured as described above, when the prediction unit 61 predicts the arrival of a tsunami to the structure 100, the air supply unit 52 operates to inflate the bag body 21 of the airbag 11, and the winch 83 pulls the airbag 11 upward. As a result, as shown in Figure 10B, the airbag 11 deploys and covers the tsunami impact surface of the structure 100.

[0052] Although the storage unit 81 is described above as being located underground, it is not limited to this. The storage unit 81 may be located near the lower part of the structure 100, for example, on the ground near the structure 100.

[0053] (3) Emergency installation type (rooftop installation method) Figures 11A and 11B are schematic side views showing the configuration of an emergency-installation type (rooftop-mounted) airbag device 1, where Figure 11A shows the configuration before the airbag 11 is deployed, and Figure 11B shows the configuration after the airbag 11 is deployed. As shown in Figure 11A, a storage compartment 81 is provided on the roof of the structure 100, and under normal circumstances, the airbag 11 is stored in the storage compartment 81. In the example shown in Figure 11A, the airbag 11 is stored rolled up, but it may be stored in other configurations, such as folded.

[0054] The storage compartment 81 houses the airbag 11 along with the air supply unit 52. The airbag 11 and the air supply unit 52 are connected within the storage compartment 81 by an air supply pipe 71, and air is supplied from the air supply unit 52 to the airbag 11 via this air supply pipe 71.

[0055] A winch 83 is installed near the ground of the structure 100 to wind up a wire 82 connected to the lower end of the airbag 11. The winch 83 winds up the wire 82, pulling the airbag 11 downwards, thereby positioning the airbag 11 against the tsunami impact surface of the structure 100.

[0056] In the airbag device 1 configured as described above, when the prediction unit 61 predicts the arrival of a tsunami to the structure 100, the air supply unit 52 operates to inflate the bag body 21 of the airbag 11, and the winch 83 pulls the airbag 11 downward. As a result, as shown in Figure 11B, the airbag 11 deploys and covers the tsunami impact surface of the structure 100.

[0057] Although the storage section 81 is shown above as being located on the roof, it is not limited to this location. The storage section 81 may be located near the top of the structure 100, for example, on the upper part of the side of the structure 100 (the tsunami impact surface).

[0058] In the airbag device 1 of each of the above-described installation configurations, if a tsunami collides with the deployed airbag 11, the impact is cushioned by the airbag 11. This prevents and reduces damage and destruction to the structure 100.

[0059] (Other embodiments) In the above embodiment, the airbag is deployed by supplying air to the airbag side from the air supply unit, but the means for deploying the airbag are not limited to this. For example, in the case of a retractable bellows-type airbag, air supply is unnecessary, and it can be deployed simply by being stretched. Below, an airbag device 2 equipped with such a bellows-type airbag will be described with reference to Figures 12A to 13B.

[0060] Figures 12A and 12B are schematic side views showing the configuration of an emergency-installation type (underground-mounted) airbag device 2, where Figure 12A shows the configuration before the airbag 91 is deployed, and Figure 12B shows the configuration after the airbag 91 is deployed. As shown in Figure 12A, an underground storage unit 81 is provided near the structure 100, and under normal circumstances, the airbag 91 is stored in this storage unit 81.

[0061] The airbag 91 is a retractable, bellows-type airbag, composed of an elastic body and FRP rings. Before deployment, the airbag 91 is folded and stored in the storage compartment 81. The lower end of the airbag 91 is fixed to the storage compartment 81.

[0062] A winch 83 is installed on the roof of structure 100 to wind up a wire 82 connected to the upper end of the airbag 91. This winch 83 winds up the wire 82 and extends the airbag 91 upward, thereby positioning the airbag 11 against the tsunami impact surface of structure 100.

[0063] In the airbag device 2 configured as described above, when the prediction unit 61 predicts the arrival of a tsunami on the structure 100, the winch 83 extends the airbag 11 upward. As a result, as shown in Figure 12B, the airbag 91 deploys without the supply of air, covering the tsunami impact surface of the structure 100.

[0064] Figures 13A and 31B are schematic side views showing the configuration of an emergency-installation type (rooftop-mounted) airbag device 2, where Figure 13A shows the configuration before the airbag 91 is deployed, and Figure 13B shows the configuration after the airbag 91 is deployed. As shown in Figure 13A, the airbag 91 is in a folded state and suspended via a wire 93 by an arm 92 provided on the roof of the structure 100. Here, the airbag 91 is maintained in a folded state by a locking mechanism (not shown).

[0065] In the airbag device 2 configured as described above, when the prediction unit 61 predicts the arrival of a tsunami on the structure 100, the lock by the locking means described above is released automatically or manually. As a result, the airbag 91 is stretched downward by its own weight. Consequently, as shown in Figure 13B, the airbag 91 deploys without the supply of air, covering the tsunami impact surface of the structure 100.

[0066] Even with this type of bellows-type airbag 91, the impact of a tsunami is cushioned in the event of a collision, just as with the airbag 11 in the above embodiment. This helps to suppress and reduce damage and destruction to the structure 100. [Explanation of Symbols]

[0067] 1,2 Airbag system 11,91 airbags 21 Bag body 22,23 Sheet body 22a, 23a Peripheral area 24 Interior space 25 sheets 31,33 eyelets 32,34 Binding members 41 Ventilation holes 43 Vulnerable parts 51 Expansion section 52 Air supply unit 53 Installation part 61 Prediction Section 62 Communications Department 71 Air supply pipe 81 Storage section 82,93 wires 83 Winch 92 Arm 100 Ground structures

Claims

1. An airbag used in an airbag system for ground structures that cushions the impact of a tsunami collision on the ground structure, When deployed, it covers at least a portion of the tsunami impact surface of the ground structure, It consists of multiple bags arranged in a predetermined direction, Airbag.

2. The aforementioned multiple bags are connected to each other. The airbag according to claim 1.

3. Multiple elongated rectangular bags extending in one direction are interconnected in the width direction. The airbag according to claim 2.

4. Multiple elongated rectangular bags extending in one direction are interconnected in the thickness direction. The airbag according to claim 2.

5. Each of the aforementioned bags is composed of two overlapping sheets, the peripheral edges of which the two sheets are attached to each other. An airbag according to any one of claims 1 to 4.

6. Each of the aforementioned bags is composed of a single folded sheet, and the overlapping peripheral edges of the sheet are adhered to each other. An airbag according to any one of claims 1 to 4.

7. The aforementioned multiple bags are connected to each other by a binding member. An airbag according to any one of claims 2 to 4.

8. The aforementioned multiple bags are connected to each other by overlapping and attaching their peripheral edges together. The airbag according to claim 2 or 3.

9. Each of the aforementioned bags is provided with a ventilation hole to release the air inside the airbag to the outside in the event of a tsunami impact. The airbag according to claims 1 to 4.

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