Building

Abstract

To provide a building that can prevent the lower floor from being flooded in a configuration in which a space continuous with outdoor space is provided between the upper floor and lower floor.SOLUTION: A house 10 according to the present invention includes an upper floor 12 positioned above the ground G, and a lower floor 16 positioned below the upper floor 12; and a piloti 18 that are continuous with the outdoor space are provided between the upper floor 12 and the lower floor 16, making it possible to go between the floor surface of the lower floor 16 and the ground G. The lower floor 16 has a floating body 30 that floats on water, and if the lower floor 16 is flooded, it is levitated by the floating body 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a building, and more particularly to a building having a space (pilotis) between an upper floor and a lower floor that is continuous with an outdoor space. [Background technology]

[0002] Some buildings, such as houses, have an upper floor located above the ground and a lower floor located below the upper floor, with a space between the upper floor and the lower floor that is continuous with the outdoor space (see, for example, Patent Document 1). The above-mentioned space is also called a piloti, and can be used for purposes such as a garage or a store.

[0003] In a building with a pilotis, the upper floor is generally supported by multiple columns, and the lower floor, which defines the bottom surface of the pilotis, is surrounded by multiple columns. In addition, there is free movement between the lower floor and the ground, and for example, a car that has been driving outside can enter the pilotis by moving from the ground to the lower floor. In other words, the pilotis can be used as a garage, and cars can be parked on the lower floor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-220925 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in a building with a pilotis structure, if the ground around the building becomes flooded due to heavy rainfall such as torrential rain or the overflowing of a nearby river, water will flow from the ground into the pilotis, causing the lower floors to become submerged, and ultimately the lower floors may become submerged. In such a case, equipment or vehicles placed on the lower floors may become submerged.

[0006] Therefore, the present invention has been made in consideration of the above-mentioned problems, and its object is to provide a building that is capable of preventing flooding of the lower floor in a configuration in which a space continuous with the outdoor space is provided between the upper floor and the lower floor. [Means for solving the problem]

[0007] The above problems are solved by the building of the present invention, which comprises an upper floor located above the ground and a lower floor located below the upper floor, a space continuous with the outdoor space is provided between the upper floor and the lower floor, and movement is possible between the floor surface of the lower floor and the ground, and the lower floor has a floating body that floats on water, and if the lower floor becomes flooded, it is raised by the floating body. With a building of the present invention, even if the lower floor is flooded, it is possible to prevent the lower floor from being flooded and to prevent equipment, vehicles, etc. placed on the lower floor from being flooded.

[0008] In addition, the building of the present invention comprises columns supporting the upper floor and a peripheral foundation on which the lower ends of the columns are placed to support the columns, and when the lower floor is not flooded, the side end face of the lower floor may face the inner surface of the peripheral foundation. With the above configuration, the direction in which the lower floor rises can be appropriately regulated.

[0009] In addition, in the building of the present invention, an auxiliary member that assists the vertical movement of the lower floor relative to the perimeter foundation may be sandwiched between the side end face of the lower floor and the inner surface of the perimeter foundation. With the above-described configuration, when the lower floor becomes flooded, the auxiliary member makes it easier for the lower floor to float, making it possible to more effectively prevent flooding of the lower floor.

[0010] In addition, in the building of the present invention, the lower floor has a finishing member superimposed on the floating body, and the floating body may be made of foamed plastic. With the above-described configuration, the lower floor becomes more likely to float in the event of flooding, making it possible to more effectively prevent the lower floor from becoming flooded.

[0011] The building of the present invention may further comprise a permeable base portion on which the lower floor is placed, and a non-permeable foundation slab on which the base portion is placed. According to the above configuration, when the ground is flooded, water is more likely to accumulate in the space between the base portion and the lower floor, making the lower floor more likely to float up when flooded, thereby more effectively preventing flooding of the lower floor.

[0012] In addition, in the building of the present invention, a space for water passage is provided within the base portion, and when the lower floor is raised, the space formed between the lower floor and the base portion may be connected to the space for water passage. According to the above configuration, when the ground is flooded, water is more likely to accumulate in the space between the base portion and the lower floor, making the lower floor more likely to float when flooded, thereby making it possible to more effectively prevent flooding of the lower floor.

[0013] The building of the present invention may further comprise a peripheral foundation constructed surrounding the space in which the lower floor and base portion are arranged, a water receiving portion arranged outside the peripheral foundation for receiving environmental water, and a communication passageway that penetrates the peripheral foundation and connects the inside of the water receiving portion to the above-mentioned space. According to the above configuration, it becomes easier to guide environmental water such as rainwater into the space between the base portion and the lower floor, so that water is more likely to accumulate in the space, making the lower floor more likely to float up in the event of flooding, and making it possible to more effectively prevent flooding of the lower floor.

[0014] In the above configuration, it is preferable that the communication passage is provided at a position that overlaps in the vertical direction with the area in which the base portion is disposed. With such a configuration, water can be efficiently stored in the space between the base portion and the lower floor, making it easier for the lower floor to rise when flooded, and more effectively preventing the lower floor from becoming flooded.

[0015] The building of the present invention may also be provided with a guide mechanism for guiding the lifting of the lower floor. According to the above configuration, the lower floor can rise in an appropriate direction when flooded.

[0016] In addition, the building of the present invention preferably includes a plurality of columns supporting the upper floor, at least one of which constitutes a guide mechanism. With such a configuration, the columns supporting the upper floor also serve as the guide mechanism, thereby making it possible to reduce the number of components of the building compared to a case in which a guide mechanism is provided separately from the columns. Effect of the Invention

[0017] According to the building of the present invention, even if the lower floor is flooded, it is possible to prevent the lower floor from becoming flooded and to prevent flooding of equipment, vehicles, etc. placed on the lower floor. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic cross-sectional view of a building according to one embodiment of the present invention, showing a normal state. [Diagram 2] FIG. 1 is a schematic cross-sectional view of a building according to one embodiment of the present invention, showing the condition when the lower floor is flooded. [Figure 3A] FIG. 2 is a diagram showing a first example of a guide mechanism of a building according to an embodiment of the present invention. [Figure 3B] FIG. 11 is a diagram showing a second example of a guide mechanism provided in a building according to an embodiment of the present invention. [Figure 4A] FIG. 1 is a schematic cross-sectional view of a building relating to another embodiment of the present invention (part 1). [Figure 4B] FIG. 2 is a schematic cross-sectional view of a building relating to another embodiment of the present invention (part 2). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] <<About a building according to one embodiment of the present invention>> Hereinafter, one embodiment of the present invention (hereinafter, the present embodiment) will be described with reference to the accompanying drawings. In the drawings, each component is illustrated somewhat simplified and schematic to make the explanation easier to understand, for example, the internal structure of the building is not illustrated in Figure 1. Also, the size (dimensions) of each component and the spacing between components shown in the drawings are different from the actual ones.

[0020] In addition, in this specification, the meanings of "same," "identical," "equal," "even," "equally divided," and "equally spaced" may include the range of error generally accepted in the technical field to which the present invention belongs. In this specification, the meanings of "vertical," "orthogonal," and "parallel" each include the range of error generally accepted in the field to which the present invention belongs, and may include cases where the deviation is within a few degrees (e.g., 2 to 3°) from the strict perpendicular, orthogonal, and parallel.

[0021] The building of the present invention is a structure having the structure and function described below, and will be described below by taking a detached house as an example of a building. However, the building of the present invention is not limited to a detached house, and may be an apartment building or a building other than a house, specifically, an office, a store, a building, a warehouse, an office building, a commercial facility, a public facility, etc.

[0022] As shown in Fig. 1, the house according to this embodiment (hereinafter, house 10) comprises an upper floor 12 arranged above the ground, a plurality of pillars 14 supporting the upper floor, and a lower floor 16 arranged below the upper floor. The house 10 also has a pilotis 18 between the upper floor 12 and the lower floor 16 as a space continuing to an outdoor space K. In other words, the lower floor 16 corresponds to the first floor facing the pilotis 18, and in this embodiment, constitutes the entire first floor.

[0023] The basic configuration of the house 10 is substantially the same as that of a known house having a pilotis, except for the lower floor 16 and the structure around it. In this embodiment, the pilotis 18 is used as a garage, for example, and a vehicle can be parked on the upper surface (floor surface) of the lower floor 16, as shown in FIG. 1. That is, it is possible to move between the floor surface of the lower floor 16 and the ground G, and specifically, in normal times (more specifically, during the period when the lower floor 16 is not flooded), the floor surface of the lower floor 16 and the ground G are substantially on the same plane and are continuous. Therefore, a vehicle traveling in the outdoor space K can enter the pilotis 18 from the ground G and ride on the floor surface of the lower floor 16. In addition, there may be a slight step between the ground G and the floor surface of the lower floor 16.

[0024] As shown in Fig. 1, the multiple columns 14 of the house 10 include a pair of columns 14a, 14b located on opposite sides of the lower floor 16, and each column 14 is supported by an outer perimeter foundation 20 of the house 10. The outer perimeter foundation 20 supports the columns 14 by placing the lower ends of the columns 14 on its upper surface, and rises from a foundation slab 22. The foundation slab 22 is a mat foundation that is provided on the house 10 to support the main body of the house 10 (specifically, the columns 14, the upper floor 12, and the second floor and above located above them), and is located at a lower position than the lower floor 16. Both the foundation slab 22 and the outer perimeter foundation 20 are made of concrete and have no water permeability.

[0025] 1, the outer perimeter foundation 20 is provided so as to surround the lower floor 16 on the outside thereof, in other words, it is constructed so as to surround the space (hereinafter, the storage space S) in which the lower floor 16 and the base part 32 described below are disposed. The upper end of the outer perimeter foundation 20 is at approximately the same level as the ground G around the house 10, or at a position slightly higher or slightly lower than the ground G.

[0026] Furthermore, as shown in FIG. 1, a water receiving section 24 for receiving environmental water is disposed outside the outer perimeter foundation 20, and more specifically, is buried beneath the ground G at a position adjacent to a part of the outer perimeter foundation 20. The water receiving section 24 is configured as a drainage ditch, a gutter, or a basin (rainwater basin), etc., and has an open upper end that is covered with a grating or a lid. Environmental water generated around the house 10 is received by the water receiving section 24 and flows into the water receiving section 24. This makes it possible to prevent the environmental water from entering the lower floor 16 side. The environmental water received by the water receiving section 24 includes rainwater, melting snow, and surface water that has flowed over the ground G. Surface water includes water generated by overflowing rivers or floods near the house 10, and water generated by accidents such as damage to water pipes or sewer pipes.

[0027] The water receiving section 24 is not particularly limited as long as it is configured to receive environmental water therein, and may be, for example, a U-shaped gutter constructed by a precast reinforced concrete (PCa) construction method. When the groundwater level is low, crushed stone, more specifically a gabion made by packing crushed stone inside, may be disposed as the water receiving section 24. A hollow steel frame or box, or a laminated panel formed by sandwiching a corrugated sheet between two flat sheets and having a hollow section inside may also be disposed as the water receiving section 24.

[0028] 1, the internal space of the water receiving section 24 communicates with the storage space S located inside the outer periphery foundation 20 via a communication passage 26 provided in the outer periphery foundation 20. The communication passage 26 penetrates a portion of the outer periphery foundation 20 adjacent to the water receiving section 24, and is specifically constituted by a pipe (e.g., a drain pipe) or a hole provided in that portion. By providing this communication passage 26, the environmental water received by the water receiving section 24 can be introduced (flowed into) the storage space S via the communication passage 26.

[0029] In the house 10 of this embodiment, if the ground G around the house 10 is flooded (strictly speaking, submerged) due to heavy rain or the like, the lower floor 16 may be flooded, but even in that case, it is possible to prevent flooding of the lower floor 16 and submersion of devices such as vehicles placed on the floor surface of the lower floor 16. The configuration of the house 10 for achieving such effects will be described below.

[0030] In the house 10 of this embodiment, the lower floor 16 has a laminated structure as shown in Figs. 1 and 2, and is specifically composed of a finishing member 28 forming a surface layer and a floating body 30 forming the base of the lower floor 16. The finishing member 28 has the same planar size as the lower floor 16, is layered on the floating body 30, and is composed of concrete (specifically, concrete floor) or plywood. The floating body 30 has the same planar size as the lower floor 16 and is composed of a member that floats on water, and is specifically composed of foamed plastic. Examples of foamed plastic that can be used to form the floating body 30 include bead-processed polystyrene foam (EPS) and extruded polystyrene foam (XPS). Since the floating body 30 forming the main body of the lower floor 16 is thus composed of a relatively lightweight material, the ground pressure acting on the foundation slab 22 supporting the lower body 16 can be reduced.

[0031] The floating body 30 constituting the lower floor 16 may be used as a form for foundation construction, specifically, an indoor form, when constructing the outer perimeter foundation 20 surrounding the lower floor 16. In this case, since the floating body 30 used as a form can be left as part of the lower floor 16 after the outer perimeter foundation 20 is constructed, the form dismantling work is omitted or reduced.

[0032] The float 30 may be made of foamed plastic panels or foamed plastic blocks. When the float 30 is made of blocks, a plurality of blocks (pieces) may be arranged in a planar shape and fastened with metal fittings or the like, or a plurality of blocks may be laid out in a rectangular frame. When fastening the blocks together, for example, metal fittings bent into a U-shape with both ends sharpened like sawtooth may be used. In this case, one end of the metal fitting is inserted into one of two adjacent blocks, and the other end is inserted into the other block, thereby fastening the two blocks together.

[0033] Also, the levitation body 30 may be divided into a plurality of parts on the lower floor 16, with gaps formed between the parts. In this case, the lower floor 16 may be configured by placing a single finishing member 28 on the plurality of parts that make up the levitation body 30.

[0034] It is also preferable that a sheet made of an insulating material, specifically a stretch film, an anti-termite sheet, or a thin steel plate such as a cable tie, is attached to part or the entire outer edge (in other words, the side end surface) of the floating body 30.

[0035] When the lower floor 16 is flooded due to heavy rain or the like, it floats up due to the floating body 30, as shown in Fig. 2. To explain in more detail, when water gradually accumulates under the lower floor 16 and the water level rises above the bottom surface of the lower floor 16, i.e., when the lower floor 16 is flooded, buoyancy acts on the floating body 30, and as a result, the lower floor 16 floats up and floats to the same level as the raised liquid level.

[0036] Moreover, the house 10 of this embodiment is provided with a structure for the lower floor 16 to appropriately float when flooded. Specifically, as shown in Fig. 1, the house 10 is provided with a permeable base portion 32 between the lower floor 16 and the foundation slab 22. The base portion 32 is disposed together with the lower floor 16 in the accommodation space S surrounded by the outer perimeter foundation 20. Moreover, the base portion 32 is placed on the foundation slab 22, and during normal times when the lower floor 16 is not flooded, the lower floor 16 is placed on the base portion 32 to support the lower floor 16 from below.

[0037] In addition, a space for water passage (not shown) is provided inside the base portion 32, and when the lower floor 16 is submerged in water and floats up, as shown in Figure 2, the space formed between the lower floor 16 and the base portion 32 is connected to the space for water passage inside the base portion 32. The base portion 32 is not particularly limited as long as it has a space for water passage therein and the space for water passage is continuous to the upper surface of the base portion 32 (i.e., the surface facing the lower floor 16). For example, the base portion 32 may be made of a panel or the like made of a porous material, specifically, a plastic having voids. Alternatively, the base portion 32 may be made of blocks of foamed plastic such as EPS arranged in a planar shape. Alternatively, the base portion 32 may be made of crushed stone, or a gabion made by packing crushed stone inside the basket.

[0038] 1, the communication passage 26 provided in the outer periphery foundation 20 is provided at a position that overlaps in the vertical direction with the range in which the base portion 32 is disposed. To explain in detail, the lower end of the communication passage 26 is at a position lower than the upper end of the base portion 32, and the upper end of the communication passage 26 is at a position higher than the lower end of the base portion 32. As a result, when water (environmental water) accumulates in the water receiving portion 24 up to a water level higher than the position of the communication passage 26, the water flows through the communication passage 26 toward the base portion 32, and finally flows into the water passage space in the base portion 32.

[0039] With the above configuration, when a large amount of environmental water is generated on the ground G around the house 10 during heavy rain, for example, when the ground G is flooded, the environmental water is received by the water receiving portion 24 and then flows through the communication passage 26 into the accommodation space S, more specifically, into the base portion 32. The environmental water that flows into the base portion 32 flows through the water passage space in the base portion 32 into the space (gap) between the lower floor 16 and the base portion 32. As the environmental water gradually accumulates in this space, the lower floor 16 becomes submerged, and eventually the lower floor 16 floats up due to the floating body 30. In this way, in this embodiment, by arranging the permeable base portion 32 between the lower floor 16 and the foundation slab 22, water can be accumulated under the lower floor 16 during heavy rain, and the lower floor 16 can be submerged and float appropriately, as shown in FIG. 2.

[0040] It is preferable that the lid 24a provided on the upper end of the water receiving portion 24 is structured to automatically open when the ground G around the water receiving portion 24 is flooded. As such a structure, a known structure that uses the buoyancy of water such as rainwater to open a lid can be used.

[0041] In this embodiment, as shown in Fig. 1, the planar size of the lower floor 16 (the size of the lower floor 16 when viewed from above) is such that the outer edge of the lower floor 16 is almost in contact with the peripheral foundation 20. In other words, when the lower floor 16 is not submerged in water, the side end face of the lower floor faces the inner surface of the peripheral foundation 20. As shown in Fig. 3, an auxiliary member 34 that assists the vertical movement of the lower floor 16 relative to the peripheral foundation 20 is sandwiched between the side end face of the lower floor 16 and the inner surface of the peripheral foundation 20.

[0042] The auxiliary member 34 has a structure similar to that of a sliding bearing, for example, and assists the lower floor 16 to float in an appropriate direction, specifically, vertically upward, along the inner surface of the periphery foundation 20 when the lower floor 16 is submerged and floats up. More specifically, depending on the position of the vehicle placed on the floor surface of the lower floor 16, the live load acting on the floor surface may become uneven. In this case, since the auxiliary member 34 is interposed between the periphery foundation 20 and the lower floor 16, the lower floor 16 can be smoothly floated vertically upward along the periphery foundation 20 even if a force acts to tilt the lower floor 16 relative to the periphery foundation 20.

[0043] The specific structure of the auxiliary member 34 is not particularly limited as long as it is interposed between the outer periphery foundation 20 and the lower floor 16 and can assist the vertical movement of the lower floor 16. For example, the vertical movement of the lower floor 16 may be supported by attaching a sliding material to one or both of the inner surface of the outer periphery foundation 20 and the side end surface of the lower floor 16. As the sliding material, a galvanized steel plate, a stainless steel plate, or a plate material having a surface coated with a fluororesin can be used. In addition, when the levitation body 30 of the lower floor 16 is configured by arranging multiple blocks, a metal fitting that fastens the blocks together may also be used as the above-mentioned sliding material. Alternatively, a rolling element such as a roller may be provided on the inner surface of the outer periphery base 20 and this rolling element may rotate while sliding against the side end surface of the lower floor 16, thereby assisting the vertical movement of the lower floor 16. In addition, a lubricant may be applied to at least one of the inner surface of the outer perimeter foundation 20 and the side end surface of the lower floor 16 to assist the up and down movement of the lower floor 16.

[0044] Furthermore, the house 10 may be provided with a guide mechanism 36 for the purpose of regulating the floating direction of the lower floor 16 in an appropriate direction when the lower floor 16 floats up when flooded. The guide mechanism 36 guides the floating of the lower floor 16, and more specifically, guides the lower floor 16 so that it floats up vertically when flooded. At least one of the multiple columns 14 provided in the house 10 may be used as the guide mechanism 36, and more specifically, the guide mechanism 36 may be formed by a pair of columns 14a, 14b located on opposite sides of the lower floor 16.

[0045] As an example of constructing the guide mechanism 36 using the columns 14a and 14b, a first example shown in FIG. 3A and a second example shown in FIG. 3B will be described. In the first example, the lower floor 16 is rectangular in plan view, and as shown in FIG. 3A, L-shaped columns 14a and 14b are arranged at two corners at both ends of the lower floor 16 in the short side direction of the lower floor 16 out of the four corners of the lower floor 16. The two columns 14a and 14b are arranged on opposite sides of the lower floor 16 in the short side direction, and are made of reinforced concrete. In addition, as shown in FIG. 3A, each of the columns 14a and 14b is arranged adjacent to the corner of the lower floor 16 with the two intersecting L-shaped portions aligned along the corner.

[0046] According to the guide mechanism 36 of the first example configured as described above, when the lower floor 16 rises in the event of flooding, the corners of the lower floor 16 can move appropriately vertically upward while following the inner wall surfaces of the columns 14a, 14b (in other words, while being guided by the paired columns 14a, 14b). Similarly, when the lower floor 16 descends as the water below the lower floor 16 drains away, the lower floor 16 can move appropriately vertically downward while being guided by the columns 14, 14b. This allows the lower floor 36 to properly return to its normal position, i.e., within the storage space S surrounded by the outer perimeter foundation 20.

[0047] In the second example of the guide mechanism 36, the lower floor 16 is rectangular in plan view, and as shown in Fig. 3B, multiple locations on the outer edge of the lower floor 16, specifically the four corners and the central portion in the longitudinal direction of the lower floor 16, are cut out in a square shape. As shown in Fig. 3B, the pillars 14a and 14b fit into the cutout locations (hereinafter referred to as cutout portions) on the outer edge of the lower floor 16. In more detail, the pillar 14a fits into the cutout portion provided on one end side of the lower floor 16 in the short side direction, and the pillar 14b fits into the cutout portion provided on the other end side.

[0048] According to the guide mechanism 36 of the second example configured as described above, when the lower floor 16 rises in the event of flooding, it can move appropriately vertically upward while the inner surface of the cutout is aligned with the outer wall surface of the pillars 14a, 14b in the cutout (in other words, while being guided by the paired pillars 14a, 14b). Also, when the water below the lower floor 16 clears and moves down, the lower floor 16 can move appropriately vertically downward while being guided by the pillars 14, 14b.

[0049] <<Other embodiments>> Although one embodiment of the building of the present invention has been described above, the above embodiment is merely an example for facilitating understanding of the present invention and does not limit the present invention. In other words, the present invention can be modified and improved without departing from the spirit of the present invention. In addition, the present invention naturally includes its equivalents.

[0050] For example, in the above embodiment, the pilotis 18 (i.e., the space connected to the outdoor space) provided between the upper floor 12 and the lower floor 16 is used as a garage. However, this is not limited to this, and the pilotis 18 may be used for purposes other than a garage, and the present invention is also applicable in such cases.

[0051] In the above embodiment, the perimeter foundation 20 is provided so as to surround the lower floor 16 on the outside thereof, and the lower floor 16 and the base portion 32 are disposed within the space (accommodation space S) inside the perimeter foundation 20. However, this is not limited to this, and as shown in Fig. 4A, a slab foundation 40 may be provided in place of the perimeter foundation 20 or in place of a portion of the perimeter foundation 20, and the lower floor 16 and the base portion 32 may be disposed within the space surrounded by the slab foundation 40.

[0052] In the above embodiment, the floor located within the pilotis 18, i.e., the entire first floor, is configured with the lower floor 16 that can float when flooded, but this is not limited to this. For example, as shown in Fig. 4A, a part of the first floor may be configured with the lower floor 16 that can float, and the remaining part may be configured with a fixed floor that does not float (i.e., a floor different from the lower floor of the present invention).

[0053] In the above embodiment, the base portion 32 having water permeability is arranged between the lower floor 16 and the foundation slab 22. In a configuration in which the base portion 32 is arranged, when the ground G around the house 10 is flooded due to heavy rain or the like, water is likely to accumulate under the lower floor 16, and as a result, the lower floor 16 is appropriately raised when flooded. However, this is not limited to this, and any structure that allows water to accumulate under the lower floor 16 may be used, and the base portion 32 may not be provided as shown in FIG. 4B. For example, if a protrusion or a leg is provided on the bottom surface of the lower floor 16 to provide a gap between the lower floor 16 and the foundation slab 22, water can be appropriately accumulated under the lower floor 16 without using the base portion 32.

[0054] In the above embodiment, at least one of the multiple columns 14 of the house 10, specifically, the pair of columns 14a and 14b located on opposite sides of the lower floor 16, constitutes the guide mechanism 36 that guides the lifting of the lower floor 16, but this is not limited thereto. For example, instead of the columns 14a and 14b constituting the guide mechanism 36 in Figs. 3A and 3B, the guide mechanism 36 may be constituted by a portion of the outer periphery foundation 20 on which the column 14 is placed (i.e., a rising portion directly below the column). Alternatively, the guide mechanism may be constituted by a dedicated device provided separately from the components of the house 10. However, from the viewpoint of reducing the number of components (number of parts) of the house 10, the above embodiment is preferable. [Explanation of symbols]

[0055] 10 Housing (Building) 12 Upper floor 14,14a,14b Pillars 16 Lower floor 18 Piloti (Space) 20 Periphery foundation 22 Foundation slab 24 Water receiving part 24a lid 26 Communication path 28 Finishing materials 30 Floating Body 32 Base 34 Auxiliary parts 36 Guide mechanism 40 Strip Foundation G ground K outdoor space S Storage space

Claims

1. The vehicle has an upper floor disposed above the ground and a lower floor disposed below the upper floor, A space continuous with an outdoor space is provided between the upper floor and the lower floor, The floor surface of the lower floor is movable between the ground and the floor surface of the lower floor. The lower floor has a floating body that floats on water, and the building is floated by the floating body when the lower floor becomes flooded.

2. A pillar supporting the upper floor; A perimeter base on which the lower ends of the columns are placed to support the columns, The building according to claim 1 , wherein when the lower floor is not submerged, a side end face of the lower floor faces an inner surface of the perimeter foundation.

3. The building according to claim 2, wherein an auxiliary member is sandwiched between the side end face of the lower floor and the inner surface of the outer perimeter foundation to assist the vertical movement of the lower floor relative to the outer perimeter foundation.

4. The lower floor has a finishing member superimposed on the floating body, The building according to claim 1 , wherein the floating body is made of foamed plastic.

5. a water-permeable base portion on which the lower floor is placed; The building of claim 1 , further comprising: an impermeable foundation slab on which the base rests.

6. A space for water passage is provided within the base portion, The building according to claim 5, wherein when the lower floor is raised, a space formed between the lower floor and the base portion is in communication with the water passage space.

7. An outer periphery foundation constructed to surround a space in which the lower floor and the base portion are disposed; A water receiving section arranged outside the outer perimeter foundation and receiving environmental water; The building according to claim 6, further comprising a communication passage penetrating the outer perimeter foundation and connecting the interior of the water receiving portion to the space.

8. The building according to claim 7 , wherein the communication passage is provided at a position that overlaps with an area in which the base portion is disposed in the vertical direction.

9. The building according to claim 1 , further comprising a guide mechanism for guiding the lifting of the lower floor.

10. A plurality of columns supporting the upper floor are provided, The building according to claim 9 , wherein at least one of the plurality of pillars constitutes the guide mechanism.

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