JP6466016B1 - Tsunami-resistant building - Google Patents

Abstract

[PROBLEMS] To receive a large number of inhabitants in the vicinity of a tsunami while maintaining the functions of the building to the maximum while providing sufficient functions and convenience as a building with a comfortable living environment. A tsunami-resistant building that can be used as a large-scale evacuation facility.
An entrance is provided on the first floor of an RC or SRC building, and a window is provided on each floor. Because it is a building that is built in an area where a tsunami may reach, it is designed as a building that meets the latest earthquake resistance standards. In addition, the entrance 2 and the window 3 are installed in the same manner as a general building so that the use and function of the building 1 are not limited. The entrance 2 and the window 3 provided in the opening have a tsunami wave. Use high-strength transparent members such as polycarbonate resin to withstand the impact force caused by the impact of pressure and drifting objects. A heliport 4 is provided on the roof of the building 1 so that it can be used to replenish and rescue food when ground traffic is interrupted.
[Selection] Figure 1

Description

  The present invention relates to a tsunami-resistant building constructed in an area that may be damaged by a tsunami. Applicable objects include hotels, office buildings, apartment houses, school buildings, hospital buildings, and other public buildings.

  The Great East Japan Earthquake on March 11, 2011 caused great damage from the tsunami, and so many buildings were swept away or severely damaged by the tsunami. Some damaged buildings were damaged by the power of the tsunami itself, and others were damaged by the impact of drifting objects.

  Under such circumstances, there are some RC structures that have a greater weight than wooden houses, and some of them have survived the tsunami force in the surrounding areas, and have remained in place. collected.

  Of the buildings that were able to stay in their original positions, many of the buildings that were detrimentally affected by the tsunami were greatly damaged from the opening, especially up to the first or third floor (for example, , See Non-Patent Document 1), and human damage is great, and there are few buildings that can be recovered as they are.

Therefore, a large number of patent applications have been filed regarding countermeasures in the event of a large-scale tsunami.
Conventionally developed inventions for countermeasures against such tsunamis are roughly classified as follows.

(1) Evacuation shelter or evacuation structure Patent Document 3 describes a foundation as an evacuation building that can easily change the area and height of an evacuation site while maintaining earthquake resistance and tsunami resistance. And a plurality of independent structures installed on the foundation and spaced apart in the beam-to-beam direction and the crossing direction, a rooftop installed on the plurality of independent structures and constituting an evacuation site, and a foundation There is disclosed a precast structure that includes a plurality of stairs that connect a section and a rooftop, and each independent structure is formed by stacking a plurality of precast concrete precast boxes in the vertical direction.

  Patent Document 7 is composed of a base part installed in the ground and a main body part fixed to the base part, and is a shelter having an evacuation space having earthquake resistance and water tightness. The upper part is formed in an elliptical dome shape or lemon shape, and more than half of the whole shelter is buried in the ground, and an entrance hatch is attached to the part exposed on the ground above the main body. A small shelter is disclosed.

  In Patent Document 9, as an underground shelter for evacuation for disaster prevention that can be installed adjacent to a building of an existing building, a tubular iron plate, a ceiling plate, a shelter body having an internal space, and a ceiling plate are provided. And a partition wall that partitions the internal space into a first chamber and a second chamber, the upper end of the partition wall is connected to the ceiling plate, and the lower portions of the first chamber and the second chamber are communication spaces An underground evacuation shelter is provided in which a first chamber is provided adjacent to a lid, a floor that divides the internal space of the first chamber into two layers is provided, and a movable floor that moves the floor up and down is provided. It is disclosed.

(2) Evacuation space in the building Patent Document 8 discloses a structure in which an attic is used as a tsunami shelter and an oblique cable is stretched to reduce the impact load with the cable and to prevent the shelter from rising and running out. Has been.

(3) Drifting type evacuation measures by floats Patent Document 4 includes a building body that can be used as a commercial facility or a residential facility, a floating body installed on the roof of the building body, and a connecting part from the building body to the floating body. An evacuation structure comprising a floating body made of a flat plate having a density that floats in water, and the connecting portion is capable of mooring the floating body to the building body when the floating body floats is disclosed. Has been.

In Patent Document 6, in a tsunami evacuation facility for evacuating people near the coast when a tsunami strikes, a foundation installed on the ground, a float installed detachably on the foundation, a foundation and a float A tsunami evacuation facility is disclosed in which, when the sea level reaches the float, the float receives buoyancy and leaves the foundation to float on the sea surface.
(4) The building itself has a structure that can withstand tsunami In Patent Document 1, a separate opening from the normal entrance and window openings is provided on the outer wall of the building, and the opening is normally closed. When the tsunami comes close, the blockage is released and a part of the tsunami is intentionally flowed into the building, reducing the load of the tsunami load on the outer wall, and the building skeleton is also tsunami via the outer wall. A structure that suppresses collapse or collapse of a building by reducing the load is disclosed.

  In Patent Document 2, as a structural frame of a reinforced concrete foundation weight structure in which the lower floor of the basement and the upper floor of the ground are integrally constructed, the building is prevented from being lifted by the pressure of the tsunami, and the door body has a pressure and watertight structure. In addition, by providing a window part, it has a pressure resistance that can withstand the pressure of the tsunami, a buffer wave that prevents the inflow of seawater and the like from the outside, and reduces the impact of the tsunami on the sea side and inland side of the outer wall A disaster prevention house with a shape is disclosed.

  Patent Document 5 discloses that a flood-proof building that can be used continuously even in the case of a flood caused by a tsunami, etc., extends over the entire circumference and has a preset maximum water level for flood damage. The outer peripheral pressure-proof wall that has higher pressure resistance and can withstand the impact of water pressure and spilled material, and the inner space inside the outer peripheral pressure-proof wall that is integrally provided inside the outer peripheral pressure-proof wall And a core partition that divides into an outer internal space between the outer wall and the outer pressure-proof wall, and a multi-level building body that is provided in the inner inner space of the outer pressure-proof wall, and the floor slab of the building body is separated from the core partition wall and the outer wall. Constructed by being rigidly joined to the circumferential pressure-proof wall, and the outer circumferential pressure-proof wall is provided with a wave-returning portion that protrudes outward from the outer surface and extends over the entire circumference, and extends from the ground surface to multiple levels of the building. An opening is formed at the height and with the outside Several buildings for flood countermeasures opening is provided for communicating the inside the internal space of a plurality of layers of objects is disclosed.

  In Patent Document 10, the foundation is fixed to the foundation as a structure that can be returned to the same life as before the tsunami when the resident was returned from the evacuation site without being swept away even if the tsunami came. The living part is provided with an openable and closable opening used for communication inside and outside the living part and prevents water from entering the living part from the opening. The foundation has a weight that increases the gravity acting on the structure rather than the buoyancy acting on the submerged structure, and the opening of the living part has a door body that opens and closes the opening. The watertight structure provided in the opening includes an elevating body disposed outside the opening, and the elevating body includes a closed position that covers the door body from the outside and an open position where the door body is exposed to the outside. The lift in the closed position is between the lift and the door. Structures such that the watertight discloses a gap region is a space with respect to the outside world.

  In addition, Patent Document 11 describes a waterproof structure technology that automatically stops water from entering the opening even when a large amount of water that can flood the entire opening of the building is near the water. A lifting plate having a specific gravity, a storage portion that stores the lifting plate, a frame portion that guides the lifting plate up and down above the storage portion, and a seal portion that seals a contact surface between the frame portion and the lifting plate. There is disclosed a shutter equipped with a shutter in which an elevating plate moves up and down in response to a fluctuation in the water level of water that has flowed into a storage unit.

  Patent Document 12 also discloses a waterproof shutter having water tightness for preventing water from entering from the outside.

Japanese Patent No. 5956801 JP 2014-012966 A Japanese Patent No. 6192286 Japanese Patent No. 6116870 Japanese Patent No. 6124073 Japanese Patent No. 6254396 Japanese Patent No. 6016869 Japanese Patent No. 6268403 Japanese Patent No. 6312939 Japanese Patent No. 4838395 Japanese Patent No. 4830054 JP 2006-138372 A

Ministry of Land, Infrastructure, Transport and Tourism National Institute for Land and Infrastructure Policy, Institute for Building Research, 2011 (2011) Tohoku Region Pacific Ocean Earthquake (Earthquake Great East Japan Earthquake) Research (preliminary report), May 2011, 6-1-6 -Page 28

  The evacuation shelter or evacuation structure of the type (1) described above is basically a facility for use when a tsunami occurs, and it is difficult to use effectively at all times. It is hard to say that this is reasonable.

  Building an evacuation space in a building of type (2) is meaningful in terms of protecting human lives, but it cannot prevent damage to the building, and the capacity of an evacuation facility is limited to the residents of the building. It will be limited.

  Drifting type evacuation measures with the float of type (3) are meaningful in terms of protecting human lives, but no further effect can be expected.

  The building of the type (4) that has a structure that can withstand a tsunami basically allows the building to be used as it is even after the tsunami has occurred, and the present invention also belongs to this type.

  Among these, the flood damage prevention building disclosed in Patent Document 5 includes an outer peripheral pressure-proof wall, a wave return portion, an opening for reducing external pressure due to a tsunami, and the like, and can resist a large tsunami. Although it is a structure like a semantic fortress, it is not suitable for application to hotels, resort apartment buildings, office buildings, and other public buildings in consideration of habitability, convenience, and design.

  In addition, those disclosed in Patent Document 2 and Patent Document 10 are intended to be usable even after a tsunami has occurred, such as providing water tightness and pressure resistance for a house and taking measures against buoyancy. The capacity of an evacuation facility is limited to the occupants of the building, and the cost for a personal housing is high, and there is also a problem of maintenance.

  The present invention provides sufficient functions and convenience as a hotel, office building, public building, etc. that are always comfortable to live in, and resists the tsunami in the event of an tsunami caused by an earthquake, making the building habitable. The purpose of this project is to provide a tsunami-resistant building that can maintain its functions as much as possible and can be used as a large-scale evacuation facility that can accept a large number of residents.

The tsunami-resistant building of the present invention is an RC structure , SRC structure or S-structure multi-story tsunami-resistant building constructed in an area where a tsunami may reach, and is less than the expected tsunami height. An opening for installing multiple windows and doors is also provided on the outer wall of the lower-floor building body that may be directly affected by the tsunami, and at least the outer wall of the floor below the expected tsunami height is in the opening. The outer wall and the opening are strong enough to withstand the expected external force caused by the tsunami, including the installed window members and door members, and the upper outer walls are lower in strength, including multiple window members installed in the openings. An outer wall and an opening are used. The “tsunami height” in the present invention refers to the depth of inundation.

  Applicable objects include, for example, hotels, office buildings, apartment houses, school buildings, hospital buildings, and other public buildings. Basically, there are no restrictions on the external design, the number of openings such as entrances and windows, and the arrangement of these buildings, so that they are not restricted by the normal use of the building.

  However, considering the tsunami load from the tsunami traveling direction when the tsunami occurred, the load due to the pulling wave, the collision load of drifting objects, etc., the streamline shape and the curve shape with low resistance were incorporated in the exterior design of the building It is rather preferable to have a design.

In the case of RC , SRC or S multi-story buildings, the foundations are solid to a certain extent, so there is little risk of buoyancy during a tsunami, and sufficient seismic design that meets or exceeds the new seismic standards In addition, the soundness of the building is maintained by adopting a structure that can withstand tsunami loads and impact loads such as drifting on the exterior walls, entrances, windows, and other openings on floors below the expected tsunami height. What should I do?

  If the outer wall is made of high-strength or ultra-high-strength concrete, increasing the amount of reinforcement if necessary, or incorporating a steel frame in the cross-section, sufficient strength can be secured, resulting in an increase in cost. However, it is considered to be very economical in that it is small compared to the cost of damage and rebuilding and the cost of repair, and it can also be used as a large-scale healthy evacuation facility.

  Here, the multi-story floor is assumed to be 3 stories or more, but considering the above-mentioned hotels, office buildings, apartment houses, school buildings, hospital buildings, etc., and making it a large-scale evacuation facility In this case, about 5 to 15 stories are desirable.

  The basic idea of the present invention is that ordinary buildings built in areas where a tsunami may reach can be lived or lived on the outer walls of lower floors below the expected tsunami height. In order to prevent troubles or inconveniences in daily life, the building itself, including the opening, is not provided to evacuate outside of the building when a tsunami occurs while providing an opening to install windows or doors. By adopting a structure that can resist tsunami, evacuation outside the building is unnecessary, and in an emergency, it can function as an evacuation facility that can accept a large number of residents.

  The tsunami-resistant building of the present invention is intended to maintain the soundness of buildings as much as possible even in a large tsunami with a very low probability of occurrence, and to minimize human damage. In addition, it is desirable to design the strength of the outer wall with a level 2 seismic motion, that is, a strength that can withstand the external force caused by the strongest ground motion and the expected tsunami in the past and future.

  As is clear from the survey results of the Great East Japan Earthquake described in Non-Patent Document 1 described above, the damage from the opening of the building is also great for the building that has avoided the collapse. As a structure of the opening that can withstand the tsunami wave pressure, for example, a window member made of polycarbonate resin may be used as the window member of the opening.

  For example, the polycarbonate resin “Panlite” manufactured by Teijin Chemicals Limited (Panlite is a registered trademark of Teijin Limited) has the largest impact resistance of plastics about 200 times that of glass, but weighs the weight of glass. It has about half the lightness and high transparency, and is used in the windows of the new Shinkansen "N700 series".

  Or as a window member, the laminated glass which pinched | interposed the resin film between the tempered glass which is used for a high-class vehicle can also be used.

  These window members with strength and impact resistance are used for window members installed on the floor below the expected height of the tsunami, and normal tempered glass or the like may be used for the upper floor, In order to further improve safety, a window member having high strength and impact resistance may be used up to the opening on the upper floor.

  In addition, if the opening in which such a window member is installed is circular or elliptical, stress concentration at the corners of the window member can be prevented, and a plurality of reinforcing bars can be formed so as to partition the opening. If stress is added, the stress generated in the window member can be relaxed.

  When using a sash for attaching a window member to an opening, in the case of an aluminum sash that has been frequently used in recent years, it cannot be said that the strength against a large external force is sufficient, so when using a sash in the present invention, it is equivalent to steel or steel It is desirable to use a sash having the above strength.

  In the present invention, it is desirable that the building itself including the opening has a structure capable of resisting a tsunami, prevents water from entering the building as much as possible, and can be used comfortably even in an emergency. For this reason, it is desirable to improve the waterproofness of the opening, and it is conceivable that a waterproof shutter is provided on the indoor side of the opening of the floor below the expected tsunami height to achieve complete waterproofing.

The tsunami-resistant building of the present invention can be used as an evacuation facility for neighboring residents in an emergency. For example, a heliport or an evacuation space may be provided on the rooftop.
By providing a heliport on the roof, it can be used to replenish and rescue food when ground traffic is interrupted.

  The tsunami-resistant building of the present invention is a normal building that can be lived or lived in an area where a tsunami may reach. In order to prevent troubles or inconveniences in daily life, the building itself, including the opening, is not provided to evacuate outside of the building when a tsunami occurs while providing an opening to install windows or doors. By adopting a structure that can withstand tsunami, evacuation outside the building is unnecessary, and in the event of an emergency, it can function as an evacuation facility that can accept many neighboring residents.

  In other words, a building that is normally used as a place of normal life can be used as an emergency evacuation facility for residents in the vicinity by maintaining the soundness of the building against a major earthquake or tsunami. When it is used as an evacuation facility, it can accommodate several times to a dozen times the number of people who can be accommodated at all times, and can be used as a large-scale evacuation facility.

  Like an evacuation shelter, it is a building that is not used only in an emergency but is always used as a normal place of life, so use the tsunami-resistant building of the present invention as an emergency evacuation facility. For example, it is more economical than the construction of a separate shelter for evacuation.

  Some buildings, such as conventional RC structures, were able to stay in place as a building structurally while the surroundings were devastatingly damaged. However, due to the tsunami that flowed from the destroyed opening, The lower floors are damaged, making it difficult to recover as a viable building, and it is costly to recover.

  In contrast, the tsunami-resistant building of the present invention has a structure that can withstand the tsunami including the opening, so that the intrusion of water flow into the building during the tsunami is prevented or suppressed, and the tsunami is damaged. Since no subsequent recovery is necessary or easy, economic losses can be minimized.

  Even if the surrounding traffic is blocked due to the tsunami, a comfortable living space or evacuation space can be maintained during the recovery activities. Moreover, if a heliport is provided on the roof, it can be used for food supply and rescue.

1 shows an embodiment of a tsunami-resistant building of the present invention, in which (a) is a plan view and (b) is an elevational view. It is explanatory drawing which shows the relationship between the tsunami inundation depth h in embodiment of FIG. 1, and the tsunami wave pressure distribution which acts on a tsunami-resistant building. It is a top view which shows the relationship with the tsunami direction at the time of constructing the tsunami-resistant building of FIG. 1 in the coastline vicinity. As another embodiment of the tsunami-resistant building of this invention, it is an elevation view at the time of forming the water flow path for allowing a part of water flow of a tsunami to pass through to the 2nd floor part of a building. It is a top view which shows the variation of the planar shape of a tsunami-resistant building. As still another embodiment of the tsunami-resistant building of the present invention, it is an elevation view in the case where the reaching floor number of the inundation depth in the building is suppressed by raising the ground.

Hereinafter, the present invention will be described with reference to the accompanying drawings.
1 to 3 show an embodiment of the tsunami-resistant building of the present invention.

  FIG. 1 assumes an RC structure or SRC structure 7-story building 1 that can be applied as a public building such as a hotel or a hospital, and has an entrance 2 on the first floor part like a general building. Windows 3 are provided on each floor from the first floor to the seventh floor. It can be lit from the window 3 and you can enjoy the view from the window.

  Since the building is constructed in an area where a tsunami may reach, it is designed as a building that satisfies the latest earthquake resistance standards (more preferably, a building that can withstand Level 2 ground motion).

  In order to prevent the use and function of the building 1 from being restricted, the opening for providing the entrance 2 and the window 3 is intentionally installed in the same manner as a general building, and for tsunamis, the entrance provided in these openings is provided. 2 and the window 3 are set to have a strength capable of withstanding the tsunami wave pressure and the impact force caused by the collision of drifting objects.

  A heliport 4 is provided on the roof of the building 1 so that it can be used for replenishing food and rescue when ground traffic is interrupted. The heliport 4 can be used at times other than disasters.

  Fig. 2 shows the relationship between the tsunami inundation depth h and the tsunami wave pressure distribution acting on the tsunami-resistant building. The opening of the entrance 2 and window 3 is maintained, and the tsunami water intrusion into the building 1 Because there is no premise, the wave force due to the tsunami wave pressure in the tsunami traveling direction has a trapezoidal distribution as shown in the figure. According to the guidelines of the Cabinet Office, the tsunami wave pressure distribution used for the design is a hydrostatic pressure distribution that reaches three times the design inundation depth.

  Moreover, the tsunami load which acts on the surface on the opposite side to the tsunami traveling direction of the building 1 by the pulling wave is set to the same level as the tsunami load in the traveling direction, and the tsunami load is set to 0.5 times or more in the orthogonal direction.

  In order for the door and window 3 of the entrance 2 to withstand the tsunami load, specifically, polycarbonate resin or high-strength tempered glass is used as a transparent door member or window member, and these are attached to the opening. Steel or high-strength steel sash is used for the sash, and the water tightness is maintained.

  Naturally, in this case, the cost of the opening is significantly increased as compared with a general building. However, the tsunami-resistant building of the present invention has a structure that can withstand a tsunami including the opening. It is more economical to assume the case where a tsunami occurs because it prevents or suppresses the intrusion of water flow into the building 1 at the time of the disaster and does not require or facilitates recovery after being damaged by the tsunami. Think of it as a building.

  In particular, a building that is normally used as a place of normal life can be used as an emergency evacuation facility for residents in the vicinity by maintaining the soundness of the building against a major earthquake or tsunami. It is a useful structure as a large-scale evacuation facility because it can accommodate several times to several tens of times the normal number of people, and a separate tsunami evacuation facility will be constructed. It is more economical than

  Fig. 3 shows the relationship with the tsunami direction when the tsunami-resistant building of Fig. 1 is constructed near the coastline. In this example, the tsunami is from the southeast direction due to the topography of the surrounding seabed and the coastline. Because the southeast corner of the building 1 is expected to face it, the effect of the tsunami load is reduced compared to the case where the traveling direction of the tsunami is the front of the building 1 (coming from the south in the figure) .

  In the example of FIG. 3, a wave force reducing work 5 is provided at a position in front of the building 1 tsunami in the traveling direction and on the side where the pulling wave acts on the building 1 to reduce the tsunami load acting on the building 1. Yes. Various designs can be considered for the material, form, width, height, etc. of the workpiece 5 depending on the conditions of the site of the building 1, the expected tsunami height, the distance from the coastline 6, and the like.

  It is also possible to give the beauty of the workpiece 5 itself, and conversely, it can be hidden by planting trees in the vicinity.

  FIG. 4 shows a case where a water passage 7 for passing a part of the water flow of the tsunami is formed on the second floor of the building 1 as another embodiment of the tsunami-resistant building of the present invention.

  In general, non-patent document 1 explains that the tsunami wave pressure distribution is reduced in the opening when the window of the opening disappears due to the tsunami in the building. However, as shown in FIG. By providing the water passage 7 penetrating through the tsunami, the tsunami load acting on the building 1 can be reduced, and an increase in the speed of the water flow on the outer peripheral surface of the building 1 can be suppressed.

  FIGS. 5A to 5D show variations of the planar shape of the tsunami-resistant building. FIG. 5 (a) is a plan view of the building 1 having a circular cross section, and the resistance can be reduced with respect to the traveling direction of the tsunami indicated by the arrow in the figure as compared with the case where the tsunami is received on a plane.

  In FIG. 5 (b), the flat cross section of the building 1 is diamond-shaped, and the resistance can be reduced by receiving a tsunami at an acute angle with respect to the traveling direction of the wave.

  In FIG. 5 (c), the flat cross section of the building 1 has a fan shape, and the resistance can be reduced by receiving a tsunami with a curved surface in the traveling direction of the waves.

  FIG. 5 (d) shows that the flat cross section of the building 1 has a fan shape, and further a water passage 7 is provided to reduce the resistance to the tsunami and reduce the tsunami load received by the building 1.

  FIG. 6 shows, as still another embodiment of the tsunami-resistant building of the present invention, a case where the reaching floor number of the inundation depth in the building is suppressed by raising the ground.

  By constructing the building 1 on the raised ground 8, in FIG. 2, the inundation depth h is the second floor in FIG. 6, whereas the same inundation depth h is located near the ceiling height of the third floor of the building 1. Near the ceiling height, the tsunami load received by the building 1 is greatly reduced, and the design conditions of the building 1 itself are reduced.

DESCRIPTION OF SYMBOLS 1 ... Building, 2 ... Entrance, 3 ... Window, 4 ... Heliport, 5 ... Wave power reduction work, 6 ... Coastline, 7 ... Waterway, 8 ... Raised ground

Claims (9)

RC structure , SRC structure or S structure multi-story tsunami-resistant building constructed in an area where a tsunami may reach, and a low-rise building that may be directly subjected to a tsunami below the expected tsunami height an opening for installing a plurality of windows and doors in the outer wall of the floors of a building body, the window member and the door member in the height below the floor of the outer wall of the tsunami is least expected is installed in the opening Including outer walls and openings that are strong enough to withstand external forces due to tsunamis , and that have lower outer walls and openings that include multiple window members installed in the openings. A characteristic tsunami-resistant building.   2. The tsunami-resistant building according to claim 1, wherein the strength of the frame and the outer wall is designed to withstand the external force caused by the level 2 earthquake motion and the expected tsunami.   The tsunami-resistant building according to claim 1 or 2, wherein a window member made of polycarbonate resin is used as the window member installed on a floor below the expected tsunami height.   The tsunami-resistant building according to claim 1 or 2, wherein a laminated glass having a resin film sandwiched between tempered glasses is used as the window member installed on a floor below an expected tsunami height. Tsunami building.   In the tsunami-resistant building as described in any one of Claims 1-4, the opening part in which the said window member of the floor below the height of the anticipated tsunami is installed is made into circular or an ellipse, Tsunami-resistant building.   In the tsunami-resistant building as described in any one of Claims 1-5, it is several in the form which divides an opening part in the opening part in which the said window member of the floor below the expected tsunami height is installed. A tsunami-resistant building characterized by the provision of reinforcing bars.   In the tsunami-resistant building as described in any one of Claims 1-6, in order to attach the said window member to the said opening part of the floor below the height of the expected tsunami, steel or the intensity | strength more than equivalent to steel is used. Tsunami-resistant building characterized by using sash that has.   The tsunami-resistant building according to any one of claims 1 to 7, wherein a waterproof shutter is provided on the indoor side of the opening of the floor below the expected tsunami height. Tsunami-resistant building. The tsunami-resistant structure according to any one of claims 1 to 8, wherein a heliport or an evacuation space is provided on the rooftop.