Anti-flooding structure

Abstract

To provide an anti-flooding structure capable of preventing flooding in a space partition facility used as an underground facility.SOLUTION: An anti-flooding structure 1 comprises: a floor wall 11; a side wall 12; a top wall 13; a space partition facility 10 that partitions a space S1 surrounded by the floor wall 11, the side wall 12, and the top wall 13 and the outside of the space S1; and a box-like pit forming body 20 buried underground and opened at the upper end. The pit forming body 20 has a pit bottom 21 formed by a water permeable member. The space partition facility 10 is disposed in a pit S2 forming the inner space of the pit forming body 20 through the open end, and floats by buoyancy when environmental water W accumulates in the pit S2.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a flood prevention structure. [Background technology]

[0002] Mobile space partition equipment is generally known, and for example, Patent Document 1 discloses a mobile simple house.

[0003] The mobile simple house described in Patent Document 1 is a mobile simple house formed by combining a plurality of roughly rectangular parallelepiped main bodies including walls, a roof, and a floor, which are configured to be movable to a predetermined installation location. In this mobile simple house, the main body includes a door provided on at least one of a pair of long side surfaces and a pair of short side surfaces that constitute the wall portion, and an opening provided on at least one of the long side surfaces and configured to allow a user to pass through. A framework is formed around the opening, which includes at least the roof side, and a fastening structure is provided on the wall portion around the framework to connect the main bodies to each other. This makes it possible to ensure that the living space in a mobile simple house is as large as possible, while allowing it to be easily moved and have a high degree of freedom in installation, and minimizing the effects of the external environment. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-80256 Summary of the Invention [Problem to be solved by the invention]

[0005] It is conceivable that such a mobile space partition facility may be used as an underground facility, but in this case, it is more susceptible to damage caused by flooding due to heavy rain or floods, etc., compared to a facility installed above ground.

[0006] Therefore, the present invention has been made in consideration of the above-mentioned problems, and its object is to provide a flood prevention structure that can prevent water from flooding into space partition equipment used as underground facilities. [Means for solving the problem]

[0007] The above-mentioned object is achieved by the flood prevention structure of the present invention, which comprises a space partition equipment having a bottom wall, side walls and ceiling wall, which separates a space surrounded by the bottom wall, side walls and ceiling wall from the outside of the space, and a box-shaped pit forming body arranged underground with an open upper end, wherein the pit forming body has a pit bottom constructed from a water-permeable material, and the space partition equipment is arranged within the pit that forms the inner space of the pit forming body through the open end, and which rises due to buoyancy when environmental water accumulates in the pit.

[0008] In the flood prevention structure of the present invention, when the ground around the flood prevention structure is flooded due to heavy rain or flooding, environmental water flows into the pit and accumulates at the bottom of the pit. Then, when the water level of the environmental water reaches a predetermined height in the pit, the space partition equipment floats up due to buoyancy. This makes it possible to prevent water from entering the space partition equipment.

[0009] The pit former may further have a pit side portion rising from the pit bottom portion, the pit side portion being made of a material having water permeability, and permeated environmental water may be supplied to the pit bottom portion. With the above-mentioned configuration, environmental water that has inundated the ground around the flood control structure can be supplied to the bottom of the pit via the side of the pit, which allows the environmental water to be smoothly stored in the pit, and as a result, flooding into the space partition equipment can be appropriately prevented.

[0010] In addition, a water inlet may be provided on at least one of the upper end surface and the upper side surface of the pit side portion. With the above-mentioned configuration, environmental water that has infiltrated into the ground around the flood control structure can be supplied from the water inlet through the side of the pit to the bottom of the pit. This allows the environmental water to be stored more smoothly in the pit, and as a result, flooding into the space partition equipment can be more appropriately prevented.

[0011] A filter for capturing foreign matter may be provided on the side of the water inlet where the environmental water flows in. With the above-mentioned configuration, it is possible to prevent foreign matter from entering the pit bottom and sides of the pit, and as a result, it is possible to prevent a decrease in water permeability at the pit bottom and sides of the pit.

[0012] Furthermore, an auxiliary member may be provided between the pit side portion and the side wall to assist the vertical movement of the space partition facility relative to the pit former. With the above configuration, the space partition equipment smoothly rises up, so that flooding of the space partition equipment can be appropriately prevented.

[0013] The outer surface of the pit former may be covered with a waterproof material. With the above-described configuration, the spatial partition equipment floats up when flooding occurs due to heavy rain or flooding, while the floating up of the spatial partition equipment can be restricted by groundwater that is originally present underground.

[0014] The outer surface of the lower end of the side wall may be an inclined surface approaching the space toward the lower end of the side wall. With the above configuration, the process of inserting the space partition equipment into the pit can be carried out smoothly when constructing a flood control structure.

[0015] Also, a locking member may be provided to lock the space partition equipment when the space partition equipment is raised to a predetermined position. With the above-mentioned configuration, the space partition equipment is restricted from rising above a predetermined position, so that the space partition equipment can be prevented from falling out of the pit.

[0016] In addition, a restricting member may be provided to restrict removal of the space partition equipment from within the pit. With the above configuration, it is possible to prevent the space partition equipment from falling out from within the pit.

[0017] Also, a fixing portion for fixing the pit former into the ground may be provided, and the fixing portion may be made of concrete and integrated with the pit former. With the above-mentioned configuration, since the fixing part and the pit forming body are integrated, it is possible to suppress the pit forming body from floating up due to buoyancy. Also, since the fixing part and the pit forming body are integrated, it is possible to improve the strength of the pit forming body against earth pressure.

[0018] The pit former may further have a pit side portion rising from the pit bottom portion, the pit bottom portion having a protruding portion that protrudes outward from the pit side portion, and a portion of the ground that surrounds the outside of the pit side portion may be placed on top of the protruding portion. With the above-mentioned configuration, the protruding portion is pressed downward by the weight of the portion of the ground surrounding the outside of the pit side portion, so that the pit former can be prevented from floating up. Effect of the Invention

[0019] According to the present invention, it is possible to provide a flood prevention structure capable of preventing flooding into a space partition facility used as an underground facility. [Brief description of the drawings]

[0020] [Figure 1] 1 is a cross-sectional view showing a flood prevention structure according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view showing the section AA of FIG. [Diagram 3] 2 is a cross-sectional view showing a case where environmental water has accumulated in a pit forming body in the flood prevention structure of FIG. 1. FIG. [Figure 4] A cross-sectional view showing a modified example of the configuration around the water inlet on the side of the pit. [Diagram 5] 5 is a cross-sectional view showing a modified example of the configuration around the water inlet shown in FIG. 4 when environmental water flows in through the water inlet. FIG. [Figure 6] FIG. 11 is a cross-sectional view showing a first modified example of the pit forming body. [Figure 7] FIG. 11 is a cross-sectional view showing a second modified example of the pit forming body. [Figure 8] FIG. 13 is a cross-sectional view showing a first modified example of the configuration around the pit forming body. [Figure 9] FIG. 11 is a cross-sectional view showing a second modified example of the configuration around the pit forming body. [Figure 10] FIG. 11 is a plan view showing a modified example of a flood prevention structure according to one embodiment of the present invention. [Figure 11] 11 is a cross-sectional view showing a modified example of the flood control structure shown in FIG. [Figure 12] 11 is a cross-sectional view showing a case where environmental water has accumulated in a pit formation body in the modified example of the flood prevention structure shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention (hereinafter, the present embodiment) will be described in detail below with reference to the preferred embodiment shown in the accompanying drawings. In addition, the drawings show each component somewhat simplified and schematic in order to make the explanation easier to understand, and the size (dimensions) of each component and the intervals between components shown in the drawings are different from the actual ones. In addition, unless otherwise specified, the material and shape of each member used to implement the present invention can be arbitrarily set depending on the application of the present invention and the state of the art at the time of implementing the present invention. Furthermore, the present invention includes its equivalents.

[0022] <<About the configuration of the flood prevention structure according to this embodiment>> A flood control structure according to this embodiment (hereinafter, flood control structure 1) will be described with reference to FIGS. 1 to 3. The flood control structure 1 is used, for example, as ancillary equipment for a house, specifically, as underground equipment for a house, more specifically, as equipment for forming a space such as a basement. As shown in Figure 3, the flood control structure 1 collects environmental water W that has flooded into the ground G around the flood control structure 1 due to heavy rain or flooding, etc., in a pit S2 that forms the inner space of the pit forming body 20, and thereby causes the space partition equipment 10, which constitutes the underground facility, to float by buoyancy. The space partition equipment 10 normally (i.e., while the environmental water W is not accumulated in the pit S2) does not float up and maintains a state of being housed in the pit forming body 20 as shown in Fig. 1. On the other hand, when the environmental water W accumulates in the pit S2, the space partition equipment 10 floats up toward the ground G due to buoyancy as shown in Fig. 3. "Underground facilities" include underground facilities for various purposes, such as facilities such as homes, offices, stores, hospitals or schools, and buildings within factories, for example, the basement of a home. "Environmental water" includes, for example, river water, groundwater, rainwater, meltwater, and seawater.

[0023] As shown in FIG. 1, the flood control structure 1 includes a space partition facility 10, a pit former 20, a filter 31, a grating 32, an auxiliary member 41, a waterproof member 51, a restricting member 61 (see FIG. 3), and a fixing portion 71.

[0024] (Space partition equipment) The space partition equipment 10 is a mobile space partition equipment and can be mounted, for example, on a truck container. The space partition equipment 10 has, for example, a substantially rectangular parallelepiped shape, and in this embodiment, the outer dimensions are assumed to be approximately 2 m long x 5 m wide x 3 m high. The space partition equipment 10 is structured so that it can float due to the environmental water W. More specifically, the space partition equipment 10 is structured so that the average density of the space partition equipment 10 is lower than the density of the environmental water W. The average density of the space partition equipment 10 is calculated by dividing the total weight of the space partition equipment 10 by the volume of the space surrounded by the outer surface of the space partition equipment 10.

[0025] 1, the space partition equipment 10 includes a bottom wall 11, a plurality of (four) side walls 12, and a ceiling wall 13. The space partition equipment 10 separates a space S1 surrounded by the bottom wall 11, the side walls 12, and the ceiling wall 13 from the outside of the space S1. The bottom wall 11 is a wall having a rectangular shape when viewed from the bottom. Each of the side walls 12 rises from the long and short sides of the bottom wall 11 and is a rectangular wall in side view. The outer surface of the lower end of the side wall 12 is an inclined surface 12a as shown in Fig. 1. The inclined surface 12a is a surface that is inclined toward the lower end of the side wall 12 so as to approach the space S1.

[0026] The ceiling wall 13 is provided at the upper end of the side wall 12 and is a wall having a rectangular shape in a plan view. The ceiling wall 13 is provided with, for example, a door (not shown) for allowing a user to enter the space S1. 1, the ceiling wall 13 has a protruding portion 13a that protrudes outward from the side wall 12. The protruding portion 13a is located directly above a water inlet 22a in the pit side portion 22 described below, and prevents rain and snow from directly entering the water inlet 22a. In this specification, the term "outside" refers to the side away from the space partition equipment 10 or the pit forming body 20 in the horizontal direction.

[0027] The outer surface of the space partition equipment 10 is covered with a waterproof layer (not shown). The waterproof layer is, for example, a metal plate (steel plate, etc.). When the waterproof layer is made up of multiple metal plates, the ends of adjacent metal plates are connected without any gaps by, for example, welding. This prevents the environmental water W from entering the space S1.

[0028] (Pit former) The pit forming body 20 is disposed underground as shown in Fig. 1. The pit forming body 20 is box-shaped with an open upper end, and the space partition equipment 10 is disposed in the pit S2 through this open end. The pit forming body 20 has a pit bottom 21 and a plurality of (four) pit side portions 22. The pit bottom 21 is a wall portion having a rectangular shape when viewed from the bottom. Each of the multiple pit side portions 22 rises from the long and short sides of the pit bottom portion 21 and is a wall portion having a rectangular shape in side view.

[0029] Each of the pit bottom 21 and the pit side 22 is made of a water-permeable material. The “permeable member” is, for example, a member that includes a water channel or a porous member, and the permeability thereof is higher than that of the ground H that surrounds the outside of the pit forming body 20.

[0030] A "component including a waterway" is a component that allows environmental water W to flow through a waterway formed therein, and may be, for example, a panel with piping embedded therein, or a concrete component including a cavity that forms a waterway. The "piping" may be made of metal, such as steel, or non-metallic material, such as polyvinyl chloride resin. An example of a "cavity" is the internal space of a void pipe that is installed when pouring concrete. A "void pipe" is a cylindrical member made of cardboard or a special waterproof board. Methods for forming concrete members containing cavities may include, for example, the Reinforced Concrete (RC) method, in which concrete is poured on-site, or the precast concrete method, in which concrete members are produced in advance in a factory and assembled on-site.

[0031] The "porous member" allows the environmental water W to flow through holes (gaps) formed inside. More specifically, the porous member may be formed, for example, by packing crushed stone or gravel into a storage box formed of wire mesh or the like, and may be, for example, a gabion.

[0032] The upper surface of the pit bottom 21 is provided with a plurality of openings (not shown), and the plurality of openings communicate with the above-mentioned water channels or holes formed inside the pit bottom 21. The pit S2 communicates with the water channels or holes formed inside the pit bottom 21 via the plurality of openings provided on the upper surface of the pit bottom 21.

[0033] A plurality of openings (not shown) are provided on the lower end surface of the pit side 22, and the plurality of openings communicate with water channels or holes formed inside the pit side 22. The plurality of openings provided on the lower end surface of the pit side 22 communicate with a plurality of openings provided on the upper surface of the pit bottom 21, so that the water channels or holes formed in the pit side 22 and the water channels or holes formed inside the pit bottom 21 communicate with each other.

[0034] An opening is provided on the upper end surface of the pit side portion 22, and as shown in Fig. 1, the opening corresponds to the water inlet 22a. The water inlet 22a communicates with a water passage and a hole (gap) formed inside the pit side portion 22. It is preferable that the water inlet 22a is provided in at least two places in the pit forming body 20. The upper end surface of the pit side portion 22 is located above the ground surface G. In this embodiment, as shown in Fig. 3, a floor portion C is provided around the upper ends of the multiple pit side portions 22. The floor portion C is formed on the ground surface G and is made of, for example, concrete. When the water level of the environmental water W that has flooded the ground surface G exceeds the upper surface of the floor portion C, the environmental water W flows into the water inlet 22a.

[0035] The water inlet 22a may be provided on the upper end surfaces of all of the pit side portions 22, or on the upper end surface of any of the pit side portions 22. The water inlet 22a may be provided on the entire upper end surface of the pit side portion 22, or on a partial area. Although the water inlet 22a is said to be provided on the upper end surface of the pit side portion 22, this is not limited to this and may, for example, be provided on the upper side surface of the pit side portion 22, or on at least one of the upper end surface and upper side portion of the pit side portion 22.

[0036] The connection points between the pit bottom 21 and each of the multiple pit side sections 22, and the connection points between adjacent pit side sections 22 among the multiple pit side sections 22, are rigidly joined to improve the strength of the pit forming body 20 against earth pressure. More specifically, in this embodiment, for example, the panels in which the piping is embedded are rigidly joined by welding or bolting them to each other.

[0037] (filter) The filter 31 is a filter for capturing foreign matter. The filter 31 captures foreign matter and allows environmental water W to pass through. The filter 31 is detachable from the flood control structure 1. 1, the filter 31 is provided on the side of the water inlet 22a into which the environmental water W flows in. In this embodiment, the filter 31 is provided outside the pit side portion 22 at a position adjacent to the upper end of the pit side portion 22. The filter 31 may be provided on the entire outer periphery of the four pit side portions 22, or may be provided on a portion of the entire periphery with a non-permeable wall member provided on the remaining portion.

[0038] (Grating) The grating 32 is a lattice-shaped metal frame, and functions as a filter for capturing foreign matter, similar to the filter 31. The grating 32 captures foreign matter larger than those captured by the filter 31, and allows the environmental water W to pass through. The grating 32 is provided on the side of the filter 31 into which the environmental water W flows, more specifically, on the opposite side to the pit side portion 22 and adjacent to the filter 31. In other words, the grating 32 is located outside the filter 31.

[0039] (Auxiliary parts) 1, the auxiliary member 41 assists the vertical movement of the space partition equipment 10 relative to the pit former 20. More specifically, the auxiliary member 41 reduces the frictional force generated by contact between the space partition equipment 10 and the pit former 20 when the space partition equipment 10 moves vertically relative to the pit former 20. The auxiliary member 41 is provided between the pit side portion 22 and the side wall 12 . As shown in FIG. 2, a plurality of auxiliary members 41 are provided along the periphery of the side wall 12 at intervals. The auxiliary member 41 may be any member that uses a known friction reduction technology. As an example, the auxiliary member 41 may be composed of a pair of extending members (not shown). Each of the pair of extending members (not shown) is a member that extends in the vertical direction, and the pair of extending members is arranged adjacent to each other in the horizontal direction. One extending member is provided on one side of the side wall 12 and the pit side portion 22. The other extending member is provided on the other side of the side wall 12 and the pit side portion 22. Each of the pair of extending members has a contact surface, and when the space partition equipment 10 moves up and down relative to the pit forming body 20, the contact surfaces of the pair of extending members come into contact with each other. At least one of the pair of extending members includes a sliding material, and the contact surface of the extending member is formed of, for example, a fluororesin. The auxiliary member 41 may have a structure similar to that of a sliding bearing, for example. In addition, a lubricant as the auxiliary member 41 may be applied to at least one of the pit side portion 22 and the side wall 12 .

[0040] (Waterproofing materials) 1, the waterproof member 51 covers the outer surface of the pit former 20. More specifically, the waterproof member 51 covers the lower end surface of the pit bottom 21 and the outer surfaces of each of the multiple pit side portions 22. The waterproofing member 51 prevents groundwater present in the ground H from permeating into the pit forming body 20. More specifically, as described above, the flood prevention structure 1 causes the space partition equipment 10 to float in the event of heavy rain or flooding. On the other hand, when the groundwater level is relatively high under normal circumstances, it is necessary to prevent the space partition equipment 10 from floating up unnecessarily, and the waterproofing member 51 is provided for that purpose. If the waterproofing member 51 were not provided, groundwater would permeate into the pit forming body 20, and the groundwater would accumulate in the pit S2, causing the space partition equipment 10 to float up. In this way, the waterproofing member 51 prevents groundwater from permeating into the pit forming body 20, thereby preventing the space partition equipment 10 from floating up. The waterproof member 51 is composed of, for example, a metal plate (steel plate, etc.) and a waterproof sheet, etc. When the waterproof member 51 is composed of a plurality of metal plates, the ends of adjacent metal plates are connected without gaps by, for example, welding, etc. Furthermore, the waterproof member 51 may be configured, for example, by providing metal plates (steel plates or the like) on both sides of an insulating plate, in consideration of improving strength, improving heat insulation, and reducing weight. Furthermore, a part or the whole of the inner surface of the pit side portion 22 may be covered with a waterproof material (not shown), and the waterproof material may be, for example, a metal plate (steel plate, etc.) or a waterproof sheet.

[0041] (Regulation material) As shown in Fig. 3, the restricting member 61 restricts the detachment of the space partition equipment 10 from within the pit S2. More specifically, as the space partition equipment 10 rises, a first distance between the upper end surface of the pit side portion 22 and the lower surface of the bottom wall 11 decreases, and when the first distance becomes equal to or smaller than a first threshold value, the space partition equipment 10 falls out of the pit S2. Therefore, the restricting member 61 restricts the rising of the space partition equipment 10 in response to the change in the first distance. More specifically, the restricting member 61 restricts the rising of the space partition equipment 10 when the first distance reaches the first threshold value. The restricting member 61 may be configured to include, for example, a wire rope. One end of the wire rope is fixed to the space partition equipment 10 (bottom wall 11 in FIG. 3) side, and the other end of the wire rope is fixed to the pit forming body 20 (pit bottom 21 in FIG. 3). The length of the wire rope may be set to, for example, a length according to the above-mentioned first threshold value.

[0042] (fixed part) 1, the fixing portion 71 is constructed for the purpose of fixing the pit forming body 20 to the ground G. The fixing portion 71 is made of concrete and provided around the periphery of the pit side portion 22. In this embodiment, the fixing part 71 is integrated with the pit forming body 20. More specifically, first, the ground G is excavated to form a concave space larger than the outer size of the pit forming body 20. The pit forming body 20 covered with the waterproofing member 51 is disposed in the concave space, and reinforcing bars or stud bolts that form the framework of the fixing part 71 are disposed around the outside of the disposed pit forming body 20. Then, the member that forms the framework of the fixing part 71 and the waterproofing member 51 of the pit forming body 20 are joined, and then ready-mixed concrete for constructing the fixing part 71 is poured (cast) around the pit forming body 20. As a result, the fixing part 71 and the pit forming body 20 are integrated. The fixing part 71 and the pit forming body 20 may be integrated by forming the outer surface of the waterproofing member 51 into an uneven shape and by causing the fixing part 71 to bite into the outer surface.

[0043] <<Operation of the flood prevention structure according to this embodiment>> Next, the operation of the flood control structure 1 will be described in more detail. When the water level of the environmental water W that has flooded the ground G falls below a predetermined height, as shown in FIG. 1, the space partition equipment 10 does not float up and remains housed within the pit forming body 20. On the other hand, when the water level of the environmental water W that has flooded the ground G reaches a predetermined height, the space partition equipment 10 rises to the ground G side as shown in FIG. More specifically, when the water level of the environmental water W that has flooded the ground G due to heavy rain or flooding reaches a predetermined height above the ground G, that is, above the upper surface of the dirt floor C, the environmental water W flows into the pit side 22 via the grating 32, the filter 31, and the water inlet 22a. The environmental water W that has flowed into the pit side 22 permeates the pit side 22 downward and flows into the pit bottom 21. The environmental water W that has flowed into the pit bottom 21 permeates the pit bottom 21, but is accumulated in the pit bottom 21 because the outer surface of the pit bottom 21 is covered with the waterproof member 51, and eventually flows out from the upper surface of the pit bottom 21 into the pit S2. When a predetermined amount of environmental water W has accumulated in the pit S2, the space partition equipment 10 rises by buoyancy while being assisted by the auxiliary member 41. Thereafter, when the first distance between the upper end surface of the pit side portion 22 and the lower surface of the bottom wall 11 reaches a first threshold value, the regulating member 61 regulates the rising of the space partition equipment 10.

[0044] <<About the action and effect of the flood prevention structure according to this embodiment>> Conventional underground facilities cannot rise due to buoyancy, and therefore end up being located below the water level of the environmental water W that has flooded the ground G due to heavy rain or flooding, and are therefore submerged. For this reason, flooding into the underground facilities cannot be avoided. On the other hand, in the flood prevention structure 1 of this embodiment, as shown in FIG. 3, when the ground G around the flood prevention structure 1 is flooded by heavy rain or flooding, etc., and the amount of flooding exceeds a predetermined amount, the environmental water W flows into the pit S2, more specifically, into the pit side portion 22 from the water inlet 22a. The environmental water W that flows into the pit side portion 22 flows downward due to its own weight and reaches the pit bottom 21 located below the pit forming body 20. Since the pit bottom portion 21 is made of a material having water permeability, the environmental water W that flows downward flows into the pit bottom portion 21. Then, if the state continues in which the amount of environmental water W newly flowing into the pit bottom portion 21 is greater than the amount of environmental water W flowing out from the pit bottom portion 21 downward, the environmental water W in the pit bottom portion 21 becomes saturated. As a result, the environmental water W begins to accumulate in the space between the pit bottom portion 21 and the space partition equipment 10. When the water level of the environmental water W reaches a predetermined height in the pit S2, the space partition equipment 10 rises due to buoyancy. As a result, at least a part of the space partition equipment 10 is positioned higher than the water surface of the environmental water W that has flooded the ground G, so that it is possible to avoid being submerged, and as a result, it is possible to prevent water from entering the space partition equipment 10.

[0045] In this embodiment, the outer surface of the pit former 20, more specifically, the lower surface of the pit bottom 21, is covered with a waterproof member 51. This prevents the environmental water W from flowing out from within the pit bottom 21 downward from the pit bottom 21, making it easier for the environmental water W to accumulate in the pit bottom 21 and allowing the environmental water W to efficiently flow out from the upper surface of the pit bottom 21 to the space partition equipment 10 side. Even if the underside of the pit bottom 21 is not covered with the waterproofing member 51, the environmental water W can be made to flow out from the upper surface of the pit bottom 21 toward the space partition equipment 10, although it takes more time than when the waterproofing member 51 is provided. In other words, since the permeability of the ground H on the underside of the pit bottom 21 is lower than the permeability of the pit bottom 21, the environmental water W accumulates in the pit bottom 21 after a predetermined time, and as a result, the environmental water W can be made to flow out from the upper surface of the pit bottom 21 toward the space partition equipment 10.

[0046] Furthermore, in the flood control structure 1, since the space partition equipment 10 is an independent piece of equipment with respect to the pit forming body 20, the space partition equipment 10 can be easily installed and removed. In addition, in the flood control structure 1, the pit former 20 is disposed underground as shown in Fig. 1, so the pit former 20 also functions as an earth retaining structure. For example, by disposing the pit former 20 on a slope, it is possible to prevent the soil from collapsing to the lower side.

[0047] The pit former 20 also has a pit side portion 22 rising from the pit bottom portion 21. The pit side portion 22 is made of a material having water permeability, and supplies the environmental water W that has permeated therethrough to the pit bottom portion 21. With the above-mentioned configuration, the environmental water W that has inundated the ground G around the flood control structure 1 can be supplied to the pit bottom 21 via the pit side 22. This allows the environmental water W to be smoothly stored in the pit S2, and as a result, flooding into the space partition equipment 10 can be appropriately prevented.

[0048] In addition, a water inlet 22a is provided on at least one of the upper end surface and upper side surface of the pit side portion 22. With the above-mentioned configuration, environmental water W that has infiltrated into the ground G around the flood control structure 1 can be supplied from the water inlet 22a to the pit bottom 21 via the pit side 22. This allows the environmental water W to be stored more smoothly in the pit S2, and as a result, flooding into the space partition equipment 10 can be more appropriately prevented.

[0049] Further, a filter 31 for capturing foreign matter is provided on the side of the water inlet 22a where the environmental water W flows in. The above-mentioned configuration can prevent foreign matter from entering the pit bottom 21 and the pit sides 22, and as a result, the decrease in water permeability at the pit bottom 21 and the pit sides 22 can be prevented.

[0050] In addition, an auxiliary member 41 is provided between the pit side portion 22 and the side wall 12 to assist the vertical movement of the space partition equipment 10 relative to the pit former 20. With the above-mentioned configuration, the space partition equipment 10 smoothly rises up, so that flooding into the space partition equipment 10 can be appropriately prevented. Furthermore, since the auxiliary member 41 contains a sliding material, when an earthquake occurs the auxiliary member 41 slides, thereby reducing the magnitude of earthquake-induced shaking transmitted from the pit forming body 20 to the space partition equipment 10.

[0051] The outer surface of the pit former 20 is covered with a waterproof member 51 . With the above-described configuration, the spatial partition equipment 10 rises up when flooding occurs due to heavy rain or flooding, while the rising up of the spatial partition equipment 10 can be restricted in the case of groundwater that is originally present underground. Furthermore, as mentioned above, since the outer surface of the pit forming body 20 is covered with the waterproof material 51, the outflow of the environmental water W from within the pit bottom 21 to below the pit bottom 21 is suppressed, and the environmental water W is more likely to accumulate within the pit bottom 21.

[0052] The outer surface of the lower end of the side wall 12 is an inclined surface 12a that approaches the space S1 toward the lower end of the side wall 12. With the above-mentioned configuration, when constructing the flood control structure 1, the step of inserting the space partition equipment 10 into the pit former 20 (hereinafter also referred to as the "insertion step") can be carried out smoothly. More specifically, as shown in FIG. 2, in the insertion step, it is necessary to insert the space partition equipment 10 into the inner region of the multiple auxiliary members 41 so that the space partition equipment 10 does not interfere with the auxiliary members 41. In this embodiment, an inclined surface 12a is provided on the outer surface of the lower end of the side wall 12, so that a sufficient gap is formed between the space partition equipment 10 and the auxiliary member 41 when the space partition equipment 10 is inserted, so that the space partition equipment 10 can be smoothly inserted while avoiding interference with the auxiliary member 41.

[0053] Further, a restricting member 61 is provided to restrict removal of the space partition equipment 10 from within the pit S2. The above configuration makes it possible to restrict removal of the space partition equipment 10 from within the pit S2. Since removal from within the pit S2 is restricted, it is possible to prevent the trouble of reinserting the space partition equipment 10 into the pit S2.

[0054] In addition, there is provided a fixing portion 71 for fixing the pit forming body 20 in the ground. The fixing portion 71 is made of concrete and is integrated with the pit forming body 20. With the above-mentioned configuration, the fixing portion 71 and the pit forming body 20 are integrated, so that when the groundwater level is relatively high, it is possible to suppress the pit forming body 20 from floating up due to buoyancy. This makes it possible to prevent the pit forming body 20 from becoming detached from the ground, and as a result, the original function of the flood control structure 1, that is, the floating of the space partition equipment 10 when flooded, is properly performed. Furthermore, since the fixing portion 71 and the pit forming body 20 are integrated, the strength of the pit forming body 20 against earth pressure can be improved.

[0055] Moreover, the water inlet 22a is provided in at least two places in the pit forming body 20. With the above-mentioned configuration, the supply of environmental water W to the pit bottom 21 and the pit side 22 and the exhaust of air remaining in the pit bottom 21 and the pit side 22 can be smoothly performed. More specifically, if there is no exhaust outlet for discharging the remaining air in the pit bottom 21 and the pit sides 22, even if the environmental water W is allowed to flow into the pit bottom 21 and the pit sides 22, the remaining air may obstruct the smooth flow. In this embodiment, one of the two water inlets 22a can function as an air exhaust outlet while the other water inlet 22a can function as an inlet for environmental water W, thereby allowing the environmental water W to flow smoothly into the pit bottom 21 and the pit side 22, thereby properly preventing water from entering the space partition equipment 10.

[0056] <<Other embodiments>> One embodiment of the flood prevention structure of the present invention has been described above, but 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.

[0057] In the above embodiment, the filter 31 is provided on the outside of the pit side portion 22. However, this is not limited thereto, and for example, as shown in Figures 4 and 5, the filter 31A may be provided on the water inlet 22a provided on the upper end surface of the pit side portion 22. Also, a grating 32A may be provided on the filter 31A. Also, a lid 33A may be provided on the lower end of the protruding portion 13a of the ceiling wall 13, which opens and closes with the lower end as a fulcrum. In the above configuration, when the water level of the environmental water W that has flooded the ground G falls below a predetermined height, the lid 33A remains closed as shown in Fig. 4. On the other hand, when the water level of the environmental water W that has flooded the ground G reaches a predetermined height, the lid 33A opens due to the water pressure of the environmental water W, and the environmental water W flows into the pit side portion 22 via the grating 32, the filter 31, and the water inlet 22a as shown in Fig. 5.

[0058] Furthermore, in the above embodiment, the fixing portion 71 made of concrete is integrated with the pit forming body 20, thereby preventing the pit forming body 20 from floating up. However, this is not limited thereto, and for example, as shown in Fig. 6, the pit bottom 21B may have a protruding portion 23 that protrudes outward from the pit side 22. A portion H1 of the ground H that surrounds the outside of the pit side 22 may be placed on the protruding portion 23. With the above-mentioned configuration, the overhanging portion 23 is pressed downward by the weight of the portion H1 of the ground H that surrounds the outside of the pit side portion 22, so that the floating of the pit forming body 20B can be suppressed.

[0059] Furthermore, in the above embodiment, the fixing portion 71 made of concrete is integrated with the pit forming body 20, thereby improving the strength of the pit forming body 20 against earth pressure. However, this is not limiting, and as shown in Fig. 7, the strength of the pit forming body 20 against earth pressure may be improved by providing haunches 24 at the connection points between the pit bottom 21 and each of the multiple pit side sections 22. The haunches 24 are provided on the pit S2 side and are located between the inner surface of the pit side section 22 and the inclined surface 12a. The haunches 24 may be provided continuously along at least one side of the upper surface of the pit bottom 21, or may be composed of multiple ribs arranged at intervals along at least one side of the upper surface of the pit bottom 21.

[0060] 8, pillars 72 and beams 73 made of a rigid frame structure may be provided around the outside of the pit forming body 20 to improve the strength of the pit forming body 20 against earth pressure. More specifically, the pit forming body 20 is housed in a box-shaped frame (structural body) with an open upper end. The box-shaped frame has pillars 72 and beams 73, and is constructed by integrating the joints of the pillars 72 and beams 73 by welding or the like. In addition, as shown in Figure 9, the strength of the pit formation body 20 against earth pressure may be improved by providing a rib 74 made of H-shaped steel or the like, and a strut (not shown), around the outer periphery of the pit side 22.

[0061] (Configuration with dry area) In the above embodiment, as shown in Fig. 2, the gap (distance) between the side wall 12 and the pit side 22 is approximately the thickness of the auxiliary member 41. However, this is not limited to this, and a dry area S3 may be further formed as a space with a sufficient gap between the side wall 12D and the pit side 22D, as in the flood control structure 1D shown in Figs. 10 to 12. The dry area S3 may be provided with a staircase E for accessing the dry area S3 from the ground G side, as shown in Fig. 10. In the flood prevention structure 1D, as shown in Fig. 11, of the pit bottom 21D and the pit side 22D, at least the pit bottom 21D is made of a material having water permeability. The material having water permeability is as described above, so the description will be omitted.

[0062] The flood control structure 1D has multiple (four) guide rails 81 around the outside of the space partition equipment 10D. More specifically, as shown in Fig. 10, the guide rails 81 are provided on both sides of the space partition equipment 10D. Each of the multiple guide rails 81 is a pillar that rises from the pit bottom 21D and extends in the vertical direction. The guide rail 81 guides the vertical movement of the space partition equipment 10D. The guide rail 81 is made of, for example, a channel steel, and has a groove formed therein that extends in the vertical direction.

[0063] 11, an upper locking member 82 is provided on the upper portion of the groove of the guide rail 81. The upper locking member 82 is composed of rolling elements such as rollers, rollers, and balls, and slides along the outer surface of the space partition equipment 10D when the space partition equipment 10D moves up and down. More specifically, the upper locking member 82 is provided in the groove of the guide rail 81 and is rotatably supported. The upper locking member 82 does not move up and down, but comes into contact with the outer surface of the side wall 12D when the space partition equipment 10D moves up and down, and rotates due to frictional force.

[0064] A lower locking member 83 is provided on the outer surface of the lower part of the space partition equipment 10D. The lower locking member 83 is composed of rolling elements such as rollers, rollers, and balls, and moves up and down together with the space partition equipment 10D. More specifically, the lower locking member 83 fits into the groove of the guide rail 81 and slides (moves up and down) along the groove. More specifically, the lower locking member 83 is rotatably supported at a position facing the guide rail 81. The lower locking member 83 fits into the groove of the guide rail 81, and when the space partition equipment 10D moves up and down, the lower locking member 83 comes into contact with the bottom surface of the groove of the guide rail 81 and runs within the groove of the guide rail 81 while rotating due to frictional force.

[0065] As the space partition equipment 10D moves upward, the lower locking member 83 approaches the upper locking member 82 from below, and they finally come into contact with each other. As a result, the space partition equipment 10D is locked to the guide rail 81. In this way, the upper locking member 82 and the lower locking member 83 function as locking members that lock the space partition equipment 10D when the space partition equipment 10D rises to a predetermined position. The "predetermined position" is a position that prevents the space partition equipment 10D from being detached from the guide rail 81, and more specifically, is determined according to the position of the upper locking member 82 in the up-down direction.

[0066] As shown in Fig. 11, the flood control structure 1D is provided with drainage pipes 84. The drainage pipes 84 drain everyday rain and the like that enters the inner space of the pit formation body 20D including the dry area S3 to the outside of the inner space. The diameter and number of the drainage pipes 84 are set based on the everyday amount of precipitation.

[0067] The operation of the space partition equipment 10D will be described. In the case of normal precipitation, the environmental water W that has entered the inner space of the pit forming body 20D including the dry area S3 is discharged outside the inner space through the drain pipe 84. On the other hand, in the case of heavy rain or flooding, the environmental water W that has entered the inner space cannot be discharged by the drain pipe 84, overflows from the pit bottom 21D, and accumulates in the inner space. When a predetermined amount of environmental water W has accumulated in the inner space, the space partition equipment 10D begins to rise due to buoyancy. More specifically, the space partition equipment 10D rises while being guided by the guide rail 81, the upper locking member 82, and the lower locking member 83. After that, when the lower locking member 83 comes into contact with the upper locking member 82, the space partition equipment 10D is locked to the guide rail 81, and the floating of the space partition equipment 10D is restricted. In this manner, since the space partition equipment 10D is provided with the upper locking member 82 and the lower locking member 83, it is possible to prevent the space partition equipment 10D from rising above a predetermined position. [Explanation of symbols]

[0068] 1,1D Flood prevention structures 10,10D Space partition equipment 11,11D bottom wall 12,12D side wall 12a Slope 13 Ceiling Wall 13a Projection 20, 20B, 20D Pit former 21, 21B, 21D Pit bottom 22,22D Pit side 22a Water inlet 23 Overhang part 24 Hunch 31,31A Filter 32,32A Grating 33A Lid 41 Auxiliary Materials 51 Waterproofing materials 61 Regulatory components 71 Fixed part 72 Pillars 73 Beam 74 Belly Raising 81 Guide rail 82 Upper locking member 83 Lower locking member 84 Drain pipe C. Doma area E Stairs G ground H ground H1 part S1 space S2 Pit S3 Dry Area W Environmental Water

Claims

1. A space partition facility including a bottom wall, a side wall, and a ceiling wall, and partitioning a space surrounded by the bottom wall, the side wall, and the ceiling wall from the outside of the space; A box-shaped pit forming body disposed underground and having an open upper end, The pit forming body has a pit bottom made of a water-permeable material, The space partition equipment is disposed within a pit that forms the inner space of the pit forming body through the open end, and is a flood prevention structure that rises due to buoyancy when environmental water accumulates in the pit.

2. The pit forming body further has a pit side portion rising from the pit bottom, 2. The flood prevention structure according to claim 1, wherein the pit side is made of a permeable material and supplies permeated environmental water to the pit bottom.

3. 3. A flood prevention structure as described in claim 2, wherein a water inlet is provided on at least one of the upper end surface and the upper side surface of the pit side portion.

4. 4. The flood prevention structure according to claim 3, further comprising a filter for capturing foreign matter provided on the side of the water inlet into which environmental water flows.

5. 3. The flood prevention structure according to claim 2, further comprising an auxiliary member provided between the pit side portion and the side wall for assisting the vertical movement of the space partition equipment relative to the pit formation body.

6. 2. The flood prevention structure according to claim 1, wherein an outer surface of the pit formation body is covered with a waterproof material.

7. The flood prevention structure according to claim 1 , wherein an outer surface of the lower end of the side wall is an inclined surface approaching the space toward the lower end of the side wall.

8. 2. The flood prevention structure according to claim 1, further comprising a locking member for locking the space partition equipment when the space partition equipment is raised to a predetermined position.

9. The flood prevention structure according to claim 1 , further comprising a restricting member for restricting the detachment of the space partition equipment from within the pit.

10. 2. The flood prevention structure according to claim 1, further comprising a fixing portion for fixing the pit forming body into the ground, the fixing portion being made of concrete and being integrated with the pit forming body.

11. The pit forming body further has a pit side portion rising from the pit bottom, The pit bottom has a protruding portion protruding outward from the pit side portion, 2. The flood prevention structure according to claim 1, wherein a portion of the ground surrounding the outer side of the pit is placed on the protruding portion.

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