JP2017119981A - Disaster prevention shelter and method of constructing same disaster prevention shelter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disaster prevention shelter with which concrete measures for earthquake strengthening advantageous in cost and safety can be taken, and a method of constructing same disaster prevention shelter.SOLUTION: The present invention relates to a disaster prevention shelter 1 constructed while incorporated in a storage space, such as a wardrobe X, a closet, etc., of a house etc., or as a part in a room, the disaster prevention shelter consisting of a foundation part 2 installed by casting concrete on a ground surface under the floor of the wardrobe X with an opening surface formed by entirely opening the floor surface of the wardrobe, six leg parts 3 on the foundation part 2, i.e. four leg parts in the four corners in the wardrobe X and two leg parts nearby the center, and a top plate 4 supported by upper ends of the six leg parts 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a disaster prevention shelter capable of taking concrete measures for seismic reinforcement effective in terms of cost and safety, and a construction method of the disaster prevention shelter.

  Japan is an earthquake-prone area, and disaster prevention education has been conducted for the public for a long time. In addition, concrete measures such as strengthening earthquake resistance of buildings against earthquakes that are currently unknown will occur. Efforts to take countermeasures are underway. However, such a seismic strengthening measure is not so widespread due to various circumstances such as the cost of seismic renovation, especially in ordinary houses.

  On the other hand, in view of the large cost burden on earthquake-resistant renovation, by making earthquake-proof reinforcement of some buildings such as ordinary houses, for example, closet, etc. Taking the following measures to evacuate is effective from the viewpoint of cost and safety.

  For example, a multi-hatch substantially box-type shelter that can be stored and installed in a closet or the like and that can realize stability and safety is disclosed. The multiple hatch approximately box-type shelter can be stored and installed without taking up space in the house, with a configuration in which at least two hatches at the entrance and exit are provided in a box shape of a size that can be installed in the lower stage of a closet, etc. Moreover, there exists an effect that it can evacuate safely (patent document 1).

  In addition, when building a new house, when building a place where you normally live, such as a closet, closet, corridor, etc. A housing provided with an evacuation box that does not collapse in the event of an earthquake or the like by being formed into an open box shape is disclosed. In addition, it is disclosed that in a house provided with the evacuation box, a foundation can be constructed in the ground under the floor of the closet, an evacuation box can also be provided on the base, and an evacuation can be made from the floor of the closet through an evacuation exit ( Patent Document 2).

Japanese Patent Laying-Open No. 2015-193373 JP 2001-115662 A

  However, the technique described in Patent Document 1 has a problem that it is difficult for a disaster victim, particularly an elderly person, to evacuate because the shelter doorway is narrowly formed at a high position from the floor. In addition, although shelter can be stored in the lower part of the closet, the lower part usually cannot store daily necessities, and it becomes a dead space in normal times, and when the bran is opened, the shelter is exposed and looks good. However, there was also a problem that it lacked the design properties in normal times.

  In the technique described in Patent Document 2, when a new house is built, a seismic wall must be assembled in advance as a wall for closet, and when the house is retrofitted for seismic reinforcement, The foundation will be rebuilt, and the existing walls and ceilings must be disassembled before the seismic walls must be reassembled, requiring extensive renovation work, resulting in a longer construction period and increased cost burden. There was a problem.

  Therefore, the present invention is a concrete measure for seismic reinforcement that is effective in terms of cost and safety, and facilitates storage space such as a building such as a house or a part of the room by a simpler renovation work than the prior art. An object of the present invention is to provide a disaster prevention shelter that can be seismically strengthened and that is excellent in design during normal times and a method for constructing the disaster prevention shelter.

  In order to solve the above problems, the present invention is configured as follows. That is, the disaster prevention shelter according to claim 1 according to the present invention is a disaster prevention shelter constructed by being built in a storage space such as a closet or closet of a building such as a house or a part of the room, The floor surface or a part of the indoor floor surface is opened to form an open surface, and the ground surface under the floor is exposed, and the storage from above the foundation portion is installed on the ground surface under the floor. It is characterized by comprising one or a plurality of leg portions standing upright in a space or in a room and a top plate supported by the upper ends of the one or more leg portions.

  Moreover, the disaster prevention shelter according to claim 2 is a disaster prevention shelter constructed by being built into a closet of a building such as the house, and the top plate is supported by upper ends of the one or more legs. It is characterized by being provided as a middle plate of the closet or as a part of the middle plate.

  Moreover, the disaster prevention shelter according to claim 3, wherein the opening surface is formed in a rectangular shape on the floor surface of the storage space or a part of the floor surface of the room, and on the base portion, A rectangular frame-shaped bottom plate is provided in accordance with the depth of the rectangular opening surface and the approximate length of the lateral width, and the bottom plate has a length of approximately the length of the depth or the width of the opening surface, respectively. A pair of trapezoidal bottom plate members are formed in a square frame shape by contacting the trapezoidal legs with the trapezoidal short sides inside, and the one or more leg portions are erected from the bottom plate. It is characterized by becoming.

  Moreover, the disaster prevention shelter according to claim 4, wherein the opening surface is formed in a square shape on the floor surface of the storage space or a part of the floor surface of the room, and the leg portion is formed on the foundation portion. A total of six legs including four legs standing along the four corners of the opening surface and two opposing legs standing along the vicinity of the center of the width of the opening surface from the base portion It is characterized by comprising the leg of a book.

  The disaster prevention shelter according to claim 5 is characterized in that the top plate is formed in a square shape and is formed in a substantially U shape in a sectional view in which both longitudinal ends are bent downward.

  Furthermore, the construction method of the disaster prevention shelter according to claim 6 is a construction method of the disaster prevention shelter built by being built into a closet of a building such as a house, and when the existing closet has an intermediate plate, Disassembling the plate, opening the floor surface of the closet to form an opening surface, exposing the ground surface under the floor, installing the base portion on the ground surface under the floor, and on the base portion A step of standing one or more legs in the closet, and a step of providing a top plate supported on the upper end of the leg as a middle plate of the closet or as a part of the intermediate plate It is characterized by that.

  According to the disaster prevention shelter according to the first aspect of the present invention, the storage space or one of the rooms of a building such as a house can be easily renovated without dismantling the wall or ceiling of the building such as a house. The part can be seismically strengthened. In addition, even when building a building such as a house, by incorporating the disaster prevention shelter when building the storage space or a part of the room, the storage space or a part of the room can be reduced by a simple operation. It can be seismic strengthened.

  In addition, according to the disaster prevention shelter, the strength of the storage space against impact or heavy pressure caused by debris or flying objects can be improved. Therefore, in the event of a disaster such as an earthquake, if a disaster victim evacuates into the disaster prevention shelter You can safely protect yourself, and because the foundation is provided on the ground surface under the floor, it is also excellent in stability against shaking such as earthquakes, so you can protect the victims more safely.

  In addition, since the disaster prevention shelter has a structure that is dug down from the storage space or a part of the floor surface of the room to the floor, evacuate by descending from the floor surface of a building such as a house into the disaster prevention shelter. Therefore, even an elderly person or a physically handicapped person can evacuate smoothly.

  Moreover, according to the disaster prevention shelter constructed in the closet according to claim 2, since the disaster prevention shelter is constructed only in the lower step of the closet below the press intermediate plate with the top plate as an intermediate plate, the entire closet is seismically strengthened. Compared to this, it is possible to prevent intrusion of rubble and flying objects, shorten the construction period of renovation work and reduce the cost burden, and compare the height of the disaster prevention shelter to that of the middle plate By constructing at a lower height, the strength of the disaster prevention shelter can be improved than when constructed at the height of the entire closet, and the victim can be protected more safely.

  Moreover, according to the disaster prevention shelter according to claim 3, the provision of the square frame-shaped bottom plate not only improves the strength of the entire disaster prevention shelter, but also improves the strength particularly in the twisting direction. It is possible to improve the strength against an impact or heavy pressure caused by debris or flying objects from an oblique direction as well as from the side, and the disaster victim can protect himself / herself more safely in the disaster prevention shelter.

  In addition, the square frame-shaped bottom plate has a pair of trapezoidal bottom plate members each having a long side according to the depth or width of the opening surface, and each trapezoidal short side is trapezoidal with the short side inside. Since it can be formed so as to be in contact with trapezoidal legs, it is excellent in workability without feeling particularly narrow from the interior of a building such as a house to the storage space or a part of the floor under the room, and the bottom plate The working efficiency of forming can be improved.

  Moreover, according to the disaster prevention shelter according to claim 4, by providing the two leg portions that face not only the four corners but also the vicinity of the center of the lateral width, against the impact and heavy pressure on the top plate Strength can be improved in a well-balanced manner, and especially for elderly people or physically handicapped persons, it is possible to evacuate into the disaster prevention shelter by gripping the legs near the center of the width, so that evacuation into the disaster prevention shelter smoothly and safely be able to. In addition, according to the two leg portions near the center of the width, it is possible to prevent intrusion of rubble, scattered matters, etc. into the disaster prevention shelter.

  Moreover, according to the disaster prevention shelter according to claim 5, the end of the top plate in the longitudinal direction is bent into a U-shape in cross-sectional view, so that the strength of the top plate against impacts such as rubble and scattered objects is increased. It can be improved and the victims can be protected more safely in the disaster prevention shelter.

  Furthermore, according to the construction method of the disaster prevention shelter according to claim 6, it is possible to easily seismically reinforce the building such as the house by a simple renovation work without dismantling the wall surface or ceiling of the building such as the house. Can be As a result, it is possible to construct a disaster prevention shelter that is excellent in cost and safety without spending a great deal of money to take concrete measures for seismic reinforcement.

  Moreover, the disaster prevention shelters according to claims 1 to 6 do not have a solid appearance as a so-called shelter specialized in disaster prevention, and are usually constructed in a house, particularly when constructed in the storage space. Since it is not inferior to the interior of the storage space, it is also excellent in design during normal times. Further, if an evacuation space is secured in the disaster prevention shelter, not only damaged goods but also ordinary daily goods can be stored in the disaster prevention shelter.

It is a perspective view which shows the disaster prevention shelter which concerns on this invention. It is a bottom view which shows a square frame-shaped bottom plate. It is a figure which shows the 1st and 2nd process of the construction method of a disaster prevention shelter. It is a figure which shows a 3rd process. It is a figure which shows a 4th process. It is a figure which shows a 5th process.

  Hereinafter, the present invention will be specifically described with reference to the drawings. First, FIG. 1 is a perspective view showing a disaster prevention shelter 1 according to the present invention. The disaster prevention shelter 1 includes, as a basic structure, a base portion 2 installed on the ground surface under the floor, a plurality of leg portions 3 erected upward from above the base portion 2, and a plurality of leg portions 3. The top plate 4 is provided at the upper end. In addition, a present Example demonstrates the case where the disaster prevention shelter 1 is constructed | assembled in the closet X among storage spaces, such as closet X or a closet, or some indoors. In addition, the code | symbol Y in a figure shows the indoor floor surface.

  The base portion 2 opens the entire floor surface of the closet X to form a rectangular opening surface, exposes the ground surface from within the closet X, and then includes the depth α and the lateral width β of the closet X within a substantial range. It is installed by building a concrete formwork on the ground surface and placing concrete in the formwork. Or you may install in the ground surface, after forming the concrete block which can be installed in this approximate range previously outside. Thus, by providing the base part 2 on the ground surface under the floor, the stability of the disaster prevention shelter 1 itself against shaking such as an earthquake is increased, and the victim's body can be protected more safely. In addition, the ground surface under the floor represents not only the ground surface made of earth and sand, but also the foundation concrete surface of the building when exposed under the floor, and represents the surface of the foundation concrete. It means a surface.

  The plurality of leg portions 3 are provided on the base portion 2 with four leg portions 3 erected along the four corners of the closet X, and two erected along the vicinity of the center of the lateral width β of the closet X. It consists of a total of six legs 3 with the legs 3. If the leg 3 can support the top plate 4, it is possible to provide a single leg 3 near the center of the top 4, but from the viewpoint of seismic reinforcement in the disaster prevention shelter 1. In addition, it is preferable to provide at least four legs 3 at the four corners of the closet X. Furthermore, as in this embodiment, two legs 3 near the center of the lateral width β of the closet X are provided to make a total of six. It is good.

  Further, by erecting the four legs 3 so as to make contact with the four corners of the closet X, the lower stage of the closet X can be used sufficiently widely and effectively as an evacuation space. During normal times, an evacuation space can be secured and evacuation goods and daily necessities can be stored.

  Further, by providing the leg 3 on the opening side of the closet X along the vicinity of the center of the lateral width β of the closet X, the victim can hold it and evacuate into the disaster prevention shelter 1. Or even a disabled person can evacuate smoothly and safely.

  The top plate 4 is formed in a steel plate shape, and is formed in a substantially U shape in a sectional view in which both end portions in the longitudinal direction are bent downward in the vertical direction. The top plate 4 is attached as a middle plate that separates the upper stage and the lower stage in the closet X, and the top board 4 is supported by the plurality of legs 3. Further, the top plate 4 is, for example, covered with a wooden decorative plate and attached to the top plate 4 as a part of the middle plate, or on the lower surface of the wooden middle plate body provided near the center in the height direction of the closet X. A top plate 4 may be provided along the plate, and may be attached as a part of the middle plate like a middle plate supporting plate that supports the wooden middle plate body from below. Thus, the top plate 4 is preferably used as a part of the middle plate.

  In this way, the disaster prevention shelter 1 is built from the bottom of the closet X to the lower stage than the middle plate of the closet X. Compared to the seismic reinforcement of the entire closet X, intrusion of debris, flying objects, etc. The construction period of the renovation work can be shortened and the cost burden can be reduced. Further, by constructing the disaster prevention shelter 1 as low as the middle plate, the overall height of the closet X can be reduced. It is possible to secure the strength of the disaster prevention shelter 1 as compared with the construction of the above.

  Furthermore, the disaster prevention shelter 1 according to the present invention includes, as shown in FIG. 1, a heat insulating material 5 laid on the base portion 2 in addition to the basic structure as described above, and an upper surface of the heat insulating material 5. A floor plate 6 provided on the floor portion, a floor lower side wall 7 erected from the side edge on the base portion 2 along the wall surface of the closet X, and an upper surface of the heat insulating material 5 at the lower ends of the plurality of leg portions 3. And a square frame-shaped bottom plate 8 provided on the base plate.

  The heat insulating material 5 is made of a heat insulating material extruded polystyrene foam, and a heat insulating material different from the heat insulating material 5 may be provided. By laying the heat insulating material 5 or the heat insulating material on the base part 2, the room temperature in the disaster prevention shelter can be maintained relatively comfortably, especially in the evacuation situation where the body temperature is likely to decrease, such as winter, as much as possible to the physical strength of the victim An evacuation environment that does not deteriorate can be created. In addition, on the upper surface of the heat insulating material 5 and the upper surface of the bottom plate 8, the floor board 6 used as the floor surface of the disaster prevention shelter 1 is laid except the part with the said leg part 3. FIG.

  The underfloor side wall 7 covers the side surface of the disaster prevention shelter 1 under the floor of the closet X, and extends from the base portion 2 to the side edge of the opening surface of the closet X floor surface. It is provided on the four sides under the floor. According to the underfloor side wall 7, it is possible to prevent intrusion of moths, pests, and the like from the side surface direction under the floor, and to protect the disaster victim from air gaps, scattered matters, rubble, and the like. Further, the heat insulating material 5 or the heat insulating material may be provided in the lower floor wall 7.

  The bottom plate 8 has a rectangular frame shape formed along substantially the length of the depth α and the width β of the closet, and is provided on the upper surface of the heat insulating material 5. It is erected in the closet X. Therefore, the leg 3 is erected on the base 2 not only when the leg 3 is erected directly on the upper surface of the base 2 but also by the bottom plate 8 between the base 2 and the leg 3. This is expressed in the meaning of above the base portion 2 including the case where the member is interposed.

  As shown in FIG. 2, the bottom plate 8 includes a pair of trapezoidal bottom plate members 8a each having a long side substantially equal to the depth α or the lateral width β of the closet, with the short side of the trapezoid being inward. By forming adjacent trapezoidal legs in contact with each other, a square frame is formed. Thereby, it is excellent in workability, without feeling narrowness under the floor in the closet X even from the indoor floor surface Y, and the square frame-shaped bottom plate 8 can be easily provided on the base portion 2.

  According to the disaster prevention shelter 1 configured as described above, the disaster prevention shelter 1 can be easily seismically reinforced by incorporating the disaster prevention shelter 1 into the closet X by a simple renovation work without dismantling the wall or ceiling of a building such as a house. it can. In addition, since the strength of the storage space against impact or heavy pressure caused by debris or flying objects can be improved, if a disaster victim evacuates into the disaster prevention shelter 1 in the event of a disaster such as an earthquake, he can safely I can protect it. Furthermore, the appearance is similar to that of the closet X before refurbishment, and the design is excellent during normal times.

  Moreover, since the disaster prevention shelter 1 has a structure that is dug down from the floor surface of the closet X, it can evacuate so as to descend from the floor surface Y of the interior of a building such as a house into the disaster prevention shelter 1, Even elderly or physically disabled people can evacuate smoothly.

  Next, the procedure for the basic construction method of the disaster prevention shelter 1 will be specifically described below with reference to FIGS.

  First, as shown in FIG. 3, the work space concerning construction of the disaster prevention shelter 1 is ensured by dismantling and removing the existing intermediate plate of the closet X (first step). Thereafter, the entire lower floor surface of the closet X is opened to form a rectangular opening surface, and the ground surface under the floor is exposed (second step). Note that FIG. 3 does not show the intermediate plate and the floor surface of the closet X, but shows a state where they are already removed or opened. Further, the intermediate plate is provided in the vicinity of the center in the height direction of the closet X as in a general Japanese house, and divides the upper storage space and the lower storage space.

  Next, as shown in FIG. 4, the foundation part 2 is constructed on the ground surface under the floor (third step). The foundation 2 is formed by forming a concrete formwork on the ground surface under the floor according to the width of the opening surface, and placing concrete on the formwork. Alternatively, a concrete block or the like constructed in advance may be transported from the outside and installed on the ground surface. When the concrete block becomes larger than the width of the opening surface, a concrete block divided into a plurality of parts may be formed, and transported under the floor, and then assembled to construct the foundation portion 2.

  Next, as shown in FIG. 5, the four leg portions 3 erected along the four corners of the closet X and the pair of two opposing pairs erected along the vicinity of the center of the lateral width β of the closet X. A total of six legs 3 of the legs 3 are erected from above the foundation 2 (fourth step).

  By the way, when attaching the heat insulating material 5, the floor board 6, the floor underside wall 7 and the bottom board 8 shown in FIG. 1 in the embodiment in the present construction method, the attaching process is performed before and after providing the plurality of legs 3. Do.

  Specifically, after placing the foundation portion 2 shown in FIG. 3 on the ground surface under the floor, as shown in FIG. 1, first, the underfloor side wall 7 is moved from the foundation portion 2 to the side edge of the opening surface. It is provided on all sides. Then, after the heat insulating material 5 is laid on the upper surface of the base portion 2, the bottom plate 8 of FIG. 2 is installed on the heat insulating material 5 by assembling each trapezoidal bottom plate member 8 a, and then on the bottom plate 8. The six legs 3 are erected. Then, the floor board 6 from which the part according to this leg part 3 was notched is laid on the upper surface except the surface in which the several leg part 3 was erected among the upper surface of the heat insulating material 5 and the baseplate 8. FIG.

  Finally, as shown in FIG. 6, the top plate 4 supported by the upper ends of the respective leg portions 3 is used as a middle plate and provided at a height where the existing middle plate is located (fifth step). Although it is possible to provide the top plate 4 along the lower surface of the intermediate plate without removing the intermediate plate of the closet X, it is possible to secure a working space by working after removing the intermediate plate. The workability is improved. Thereafter, a wooden decorative board is coated on the top surface of the top board 4 as a finish. Further, the height at which the top plate 4 is provided is not limited to the height at which the existing middle plate is located, and can be set to a desired height if an evacuation space can be secured below the top plate 4.

  If the disaster prevention shelter 1 is constructed in this way, it is possible to easily evacuate the house by making earthquake-proof reinforcement easily and without performing major renovation work such as dismantling the side walls and ceiling of the closet X of the existing building. It is possible to take concrete measures for seismic reinforcement effectively from the viewpoint of cost and safety. Furthermore, the appearance is similar to that of the closet X before refurbishment, and the design is excellent during normal times.

  Next, the results of the structural calculation for the disaster prevention shelter 1 shown in FIG. 1 will be described below.

In this calculation, a total of six legs 3 are provided, including four legs standing along the four corners of the closet X and two legs facing each other along the vicinity of the center of the lateral width β of the closet X. In the disaster prevention shelter 1, as the material of the plurality of legs 3, size (B × D = 75 mm × 75 mm), thickness (t = 3.2 mm), cross-sectional area (A = 8.927 cm ² ), section modulus ( Z = 20.1 cm ³ ), secondary moment of section (I = 75.5 cm ⁴ ), secondary radius of section (i = 2.91 cm), material strength (F = 235 N / mm ² ), long-term allowable application strength (ft = 157 N / mm ² ), a slender ratio (λ = length 125.8 mm / 2.91 = 43.2), and a steel square steel pipe (STKR400) having a tensile strength (fc = 141 N / mm ² ), Structural calculations for vertical loads were performed.

  As a result of the structural calculation, the maximum weight that can be borne by one leg 3 among the plurality of legs 3 is P = 8.927 × 100 × 141 = 1125870.7N = 12.9KN (12.8 t). In addition, since the total number of the leg portions 3 is six, the maximum weight that can be borne by the whole disaster prevention shelter 1 is found to be ΣW = 15.9 × 6 = 755.4 KN (77.1 t).

  From the above, the disaster prevention shelter 1 according to the present invention can withstand a load of 77.1 tons with respect to a vertical load, and has a sufficiently effective strength against impacts and heavy pressures such as debris and flying objects. In the event of an earthquake, etc., it was found that the victims can evacuate safely.

  Furthermore, the disaster prevention shelter 1 according to the present invention is excellent not only in the strength against the vertical load but also in the torsional direction by providing the bottom plate 8 at the lower end of the leg portion 3, and has a substantially reduced cross-sectional view. Due to the top plate 2 having improved strength by being formed in a letter shape, it is possible to safely protect the victims.

  In the said Example, although the disaster prevention shelter 1 was retrofitted to the closet X of the existing house, it is also possible to provide in other storage spaces, such as a closet or a shoe box of a front door, and a part of room | chamber interior. When constructing the disaster prevention shelter 1 in a part of the room, the floor surface is opened within the construction range, and the disaster prevention shelter 1 is constructed from the foundation portion 2 in the same manner as the closet X. The top plate 4 used as the middle plate of X may be covered with a decorative plate or the like, and can be used as a display shelf for decorative items, a top plate of a desk, or the like.

  In the above embodiment, the disaster prevention shelter 1 according to the present invention is constructed by retrofitting to a building such as an existing house by retrofitting, but when the building is newly constructed, a storage space for a closet X or a closet It goes without saying that the disaster prevention shelter 1 can be built into a part of the room and built. At this time, a storage space such as the closet X or a floor surface of a part of the room is not provided and the ground surface under the floor is exposed to expose the intermediate plate in the case of the existing closet X. The disaster prevention shelter 1 can be easily incorporated into the closet X and subjected to seismic reinforcement by a simple operation by providing the top plate 4 as an intermediate plate or the like after the foundation portion 2 or the like is constructed without being provided in advance.

DESCRIPTION OF SYMBOLS 1 Disaster prevention shelter 2 Base part 3 Leg part 4 Top plate 5 Thermal insulation material 6 Floor board 7 Under floor side wall 8 Bottom board 8a Bottom board member X Closet Y Floor surface α Depth β Horizontal width

Claims (6)

A disaster prevention shelter built in a storage space such as a closet or closet of a building such as a house, or a part of the room,
A base part installed on the ground surface under the floor in a state where an opening surface is formed by opening the floor surface of the storage space or a part of the floor of the room, and the ground surface under the floor is exposed, and the base part A disaster prevention shelter comprising one or more legs standing up in the storage space or in the room from above and a top plate supported by upper ends of the one or more legs.
A disaster prevention shelter constructed by being built into a closet of a building such as a house, wherein the top plate is supported by upper ends of the one or more legs and used as an intermediate plate of the closet, or The disaster prevention shelter according to claim 1, wherein the disaster prevention shelter is provided as a part.
The opening surface is formed in a rectangular shape on the floor surface of the storage space or a part of the floor surface of the room, and on the base portion, the depth and the lateral width of the rectangular opening surface are approximately A square frame-shaped bottom plate formed according to the length is provided,
The bottom plate is formed in a rectangular frame shape by contacting a pair of trapezoidal bottom plate members each having a long side of the depth or width of the opening surface and contacting a trapezoidal leg with the short side of the trapezoid inside. Formed into
The disaster prevention shelter according to claim 1, wherein the one or more legs are erected from the bottom plate.
The opening surface is formed in a rectangular shape on the floor surface of the storage space or a part of the floor surface of the room,
The leg portions are opposed to four leg portions that are erected along the four corners of the opening surface from the base portion, and that are erected along the vicinity of the lateral width center of the opening surface from the base portion. The disaster prevention shelter according to any one of claims 1 to 3, wherein the disaster prevention shelter is composed of a total of six legs with two legs.
The disaster prevention shelter according to any one of claims 1 to 4, wherein the top plate is formed in a quadrangular shape and is formed in a substantially U-shaped cross-sectional view with both longitudinal ends bent downward.
It is a construction method of a disaster prevention shelter that is built in a closet of a building such as a house,
If there is an intermediate plate in the existing closet, disassembling the intermediate plate;
Opening the floor surface of the closet to form an opening surface, exposing the ground surface under the floor; and
Installing a foundation on the ground surface under the floor;
A step of standing one or a plurality of legs in the closet from the base part;
And a step of providing a top plate supported on an upper end of the leg portion as a middle plate of the closet or as a part of the middle plate.

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