Outdoor structure

Abstract

To provide an outdoor structure that can prevent internal water flooding and has aesthetic appeal.SOLUTION: An outdoor structure (1) comprises: a water storage tank (38); a recess (14) formed in a concave shape in a ground surface of a garden; an overflow basin (42) buried underground in the recess (14); a rainwater guide passage (30) that guides rainwater fallen on a roof of a house (3) to the water storage tank (38) and the overflow basin (42) and guides rainwater overflowing from the water storage tank (38) due to a full water level of the water storage tank (38) to the overflow basin (42); and a water collection basin (50) buried underground in the recess (14) at a position away from the overflow basin (42).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to exterior structures. [Background technology]

[0002] Patent Document 1 discloses a reverse reflux purification system that removes impurities from domestic wastewater. The reverse reflux purification system includes a purification mechanism, an open channel structure, and a retarding basin mechanism. The purification mechanism is a manhole structure located upstream into which water to be treated, such as various types of domestic wastewater, flows and is purified through sedimentation and filtration. The retarding basin mechanism is located downstream of the open channel structure, which allows for planting. The retarding basin mechanism purifies the water to be treated by contacting it with air after it has been purified by the purification mechanism.

[0003] Patent Document 2 discloses a technology in which a water intake device installed midway through a downspout divides rainwater flowing down from the downspout above the device into two channels: one into the downspout below the device and one into a tank. When the tank becomes full with rainwater, the rainwater inside the water intake device overflows from the tank into the downspout below. During rainy weather, after the tank is full, the amount of water discharged from the downspout into the sewer increases, and a full tank can cause inland flooding. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Publication No. 3016288 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-1057 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide an exterior structure that can prevent inland flooding and has an appealing appearance. [Means for solving the problem]

[0006] The reference numerals in parentheses below refer to FIGS. 1 to 4.

[0007] According to claim 1, An exterior structure (1) constructed outside a house (3), a rainwater storage tank (38); a recess (14) formed in a concave shape on the ground of the garden outside the house (3); an overflow basin (42) that is buried in the ground in the recess (14), is partially exposed above ground, has an overflow outlet (42a) in the exposed part, collects rainwater up to the overflow outlet (42a), and overflows the rainwater from the overflow outlet (42a) into the recess (14); a rainwater guideway (30) that guides rainwater that falls on the roof of the carport or the house (3) to the water tank (38) and the overflow basin (42) and guides rainwater that overflows from the water tank (38) when the water tank (38) is full to the overflow basin (42); a catchment basin (50) that is buried in the ground of the recess (14) at a position away from the overflow basin (42), is partially exposed above ground, has a water intake (50a) in the exposed part, and takes in and stores rainwater that has accumulated in the recess (14) up to the water intake (50a) through the water intake (50a); An exterior structure (1) is provided, which is characterized by comprising:

[0008] According to claim 1 as described above, during rainy weather, the rainwater guide path (30) guides rainwater to the water tank (38), so that the rainwater is stored in the water tank (38). Rainwater that does not flow into the water tank (38) is guided by the rainwater guide path (30) to the overflow manhole (42) and stored in the overflow manhole (42). After the water tank (38) is full, rainwater that overflows from the water tank (38) is also guided by the rainwater guide path (30) to the overflow manhole (42) and stored in the overflow manhole (42). Even if the rainwater in the overflow manhole (42) overflows from the overflow outlet (42a) of the overflow manhole (42), the rainwater is stored in the recess (14). When the rainwater level inside the recess (14) reaches the intake (50a) of the catchment basin (50), the rainwater flows through the intake (50a) into the catchment basin (50) and is stored in the catchment basin (50). Storing rainwater in four locations—the water tank (38), the overflow basin (42), the recess (14), and the catchment basin (50)—contributes to reducing the amount of rainwater discharged into the sewer system. Therefore, the exterior structure (1) contributes to preventing inland flooding. Since some of the rainwater inside the recess (14) seeps into the ground, the amount of rainwater discharged into the sewer is reduced. Therefore, the exterior structure (1) contributes to preventing inland flooding. When it rains, rainwater collects in the recess (14), creating the appearance of a pond. If the rain continues, you can see the water flowing from the overflow basin (42) to the catchment basin (50). After the rain stops, the rainwater in the recess (14) seeps into the ground or evaporates, making the pond appear to have dried up and disappeared. These features contribute to improving the aesthetic appeal of the exterior structure (1). The rainwater collected in the water tank 38 can be used for cleaning, watering plants, or for daily life when the water supply is cut off.

[0009] According to claim 2, The exterior structure (1) according to claim 1, The recess (14) has a bottom that slopes downward from the overflow basin (42) toward the catch basin (50). An exterior structure (1) is provided.

[0010] According to claim 2 as described above, the bottom of the recess (14) slopes downward from the overflow box (42) toward the catchment box (50), so when it starts to rain and rainwater begins to overflow from the overflow box (42), the water flow from the overflow box (42) toward the catchment box (50) is visible. Even if rainwater collects in the recess (14), if the recess (14) is shallow, the water flow from the overflow box (42) toward the catchment box (50) is visible. Such water flow during rainy weather contributes to improving the aesthetic appeal of the exterior structure (1). Since debris such as dead leaves contained in rainwater tends to accumulate near the catch basin (50) in the recess (14), the recess (14) is easy to clean.

[0011] According to claim 3, The exterior structure (1) according to claim 1 or 2, The depth from the intake (50a) to the bottom of the catch basin (50) is greater than the depth from the overflow outlet (42a) to the bottom of the overflow basin (42). An exterior structure (1) is provided.

[0012] According to the third aspect of the invention, rainwater inside the recess (14) is prone to become mixed with mud, and since the catchment basin (50) is deeper than the overflow basin (42), a large amount of mud in the rainwater accumulates in the catchment basin (50).

[0013] According to claim 4, The exterior structure (1) according to claim 1 or 2, A drainage pipe (52) is buried underground from the catchment basin (50) to the sewer and is connected to the catchment basin (50) and the sewer. An exterior structure (1) is provided, which is characterized by comprising:

[0014] According to the fourth aspect of the present invention, the drain pipe (52) is connected to the catch basin (50) and the sewer, so that the rainwater stored in the catch basin (50) is discharged into the sewer.

[0015] According to claim 5, The exterior structure (1) according to claim 1 or 2, Plants (16) planted at the bottom of the recess (14) or around the recess (14), or both. An exterior structure (1) is provided, which is characterized by comprising:

[0016] According to claim 5, the plants (16) are planted at the bottom of the recess (14), around the recess (14), or both, which allows rainwater to easily infiltrate into the ground. By allowing rainwater to infiltrate into the ground, the amount of rainwater discharged into the sewer system is reduced and rainwater pollution is eliminated. Therefore, the exterior structure (1) contributes to preventing inland flooding and reducing environmental impact.

[0017] According to claim 6, The exterior structure (1) according to claim 1 or 2, Natural grass planted at the bottom of the recess (14) or around the recess (14), or both. An exterior structure (1) is provided, which is characterized by comprising:

[0018] According to claim 6, since natural grass is planted at the bottom of the recess (14), around the recess (14), or both, rainwater can easily penetrate into the ground. Therefore, the exterior structure (1) contributes to preventing inland flooding and reducing environmental impact.

[0019] According to claim 7, The exterior structure (1) according to claim 1 or 2, Crushed stone (18) piled on top of the overflow basin (42) An exterior structure (1) is provided, which is characterized by comprising:

[0020] According to claim 7, the crushed stones (18) are piled on top of the overflow basin (42), and the overflow basin (42) is hidden under the crushed stones (18), improving the design of the exterior structure (1). In addition, during rainy weather, rainwater appears to spring from the crushed stones (18), which contributes to improving the aesthetic appeal of the exterior structure (1).

[0021] According to claim 8, The exterior structure (1) according to claim 1 or 2, Crushed stone (20) piled on top of the catch basin (50) An exterior structure (1) is provided, which is characterized by comprising:

[0022] According to claim 8, the crushed stones (20) are piled on top of the catchment basin (50), and the catchment basin (50) is hidden under the crushed stones (20), improving the design of the exterior structure (1). In addition, during rainy weather, rainwater appears to seep in between the crushed stones (20), which contributes to improving the aesthetic appeal of the exterior structure (1).

[0023] According to claim 9, The exterior structure (1) according to claim 1 or 2, The depth from the ground around the recess (14) to the overflow outlet (42a) is equal to the depth from the ground around the recess (14) to the water intake (50a). An exterior structure (1) is provided.

[0024] According to the ninth aspect of the present invention, the level of rainwater collected in the recess (14) is adjusted to the depth of the overflow port (42a) and the water intake port (50a).

[0025] According to claim 10, The exterior structure (1) according to claim 1 or 2, The rainwater guideway (30) an upper downspout (32a) attached to the exterior wall of the house (3) so as to extend vertically along the exterior wall; a branch joint (34) connected to the lower end of the upper downspout (32a) and the water tank (38); a lower downspout (32b) attached to the outer wall so as to extend vertically along the outer wall from the branch joint (34) to the ground; and The branch joint (34) guides rainwater flowing down the upper downspout (32a) to the lower downspout (32b) and the water tank (38), and when the water tank (38) is full, causes rainwater to overflow from the water tank (38) into the lower downspout (32b). An exterior structure (1) is provided. [Effects of the Invention]

[0026] According to the present invention, the exterior structure contributes to preventing inland flooding. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a cross-sectional view showing a schematic view of the exterior structure. [Figure 2] Figure 2 is a plan view of the exterior. [Figure 3] FIG. 3 is a cross-sectional view of a branch joint provided midway through a downspout. [Figure 4] FIG. 4 is a cross-sectional view that schematically shows the exterior structure of the modified example. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, embodiments will be described with reference to the drawings. Features and technical effects of the embodiments will be understood from the following detailed description and drawings. However, the scope of the present invention is not limited to the embodiments disclosed below. Because the drawings are provided for illustrative purposes only, the scope of the present invention is not limited to the examples in the drawings.

[0029] <1. Exterior> Fig. 1 is a cross-sectional view showing a schematic view of the exterior structure 1 during rainy weather. Fig. 2 is a plan view of the exterior structure 1. The exterior structure 1 is constructed outside the house 3 on the site on which the house 3 is built. The exterior structure 1 has a garden, a rainwater infiltration zone 12, a dry pond 14, plantings 16, a first crushed stone 18, a second crushed stone 20, a rainwater guideway 30, a water tank 38, an underground pipe 40, an overflow basin 42, a catchment basin 50, and a drainage pipe 52.

[0030] The garden is constructed on the site outside the house 3. The house 3 is a detached house or an apartment building.

[0031] The rainwater infiltration zone 12 is created by preparing the garden ground to a level that allows rainwater to adequately infiltrate into the garden ground. For example, the rainwater infiltration zone 12 may be created by excavating part or all of the garden and backfilling the excavated area with soil of adequate permeability. The backfilled soil may be compacted to adjust the soil's permeability. The soil backfilled in the excavated area may include excavated soil (soil generated by excavation), black soil, Kanuma soil, Akadama soil, Arakida soil, decomposed granite soil, compost, peat moss, vermiculite, charcoal, perlite, zeolite, leaf mold, large gravel, medium gravel, or fine gravel, or two or more of these. Two or more of these types of soil may be layered in the excavated area. Excavated soil refers to soil and sand generated by excavation. The excavated soil may be sieved. A permeable sheet may be laid at the bottom of the excavated area, and soil may be backfilled on top of the permeable sheet. If the original ground of the garden has a geology that allows rainwater to infiltrate appropriately, the original ground may be leveled to create a rainwater infiltration zone 12. Lawn may be planted in the rainwater infiltration zone 12. The lawn may be either natural or artificial.

[0032] The dry pond 14 is a depression formed in the rainwater infiltration zone 12. The bottom of the dry pond 14 slopes downward from a shallow point to a deep point. The deepest point of the dry pond 14 is, for example, 200 mm from the ground around the dry pond 14. Grass may be grown on the bottom of the dry pond 14. Stones such as large pebbles, medium-sized pebbles, or fine gravel may be deposited on the bottom of the dry pond 14. In Figure 2, a dot pattern is drawn in the area where the dry pond 14 has been created. Contour lines are drawn in the area where the dry pond 14 has been created so that the dot pattern becomes darker as the bottom of the dry pond 14 becomes deeper.

[0033] The first crushed stones 18 are piled in a shallow part of the dried-up pond 14. The second crushed stones 20 are piled in a deep part of the dried-up pond 14. The crushed stones 18, 20 may be piled up so as to extend to the outside of the dried-up pond 14. There are no particular limitations on the stones used for the crushed stones 18, 20, but for example, decorative stones may be used for the crushed stones 18, 20.

[0034] During rainy weather, rainwater flows into the dry pond 14, and the water accumulates in the dry pond 14 up to a predetermined water level, and any water exceeding the predetermined water level flows out of the dry pond 14. During rainy weather, water appears to spring from the first crushed stone 18 into the dry pond 14. During rainy weather, the water in the dry pond 14 appears to flow into the second crushed stone 20. When the rain stops, the water accumulated in the dry pond 14 evaporates or seeps into the ground. Therefore, the water in the dry pond 14 dries up except during rainy weather and for a predetermined period of time thereafter. The routes by which rainwater flows into and out of the dry pond 14 during rainy weather will be described in detail later.

[0035] The plants 16 are planted in the rainwater infiltration zone 12. Specifically, the plants 16 are planted around the dry pond 14 or at the bottom of the dry pond 14.

[0036] The path of rainwater during rainy weather will be explained in detail. The rainwater path is composed of a rainwater guideway 30, a water tank 38, an overflow basin 42, a dry pond 14, a catchment basin 50 and a drainage pipe 52.

[0037] The rainwater guideway 30 guides rainwater that falls on the roof of the house 3 to an above-ground water tank 38 and an underground overflow basin 42, and guides rainwater that overflows from the water tank 38 when the water tank 38 is full to the overflow basin 42. The rainwater guideway 30 includes a horizontal gutter 31, a downspout 32, a branch joint 34, a connecting pipe 36, an underground pipe 40, etc.

[0038] The horizontal gutter 31 is attached to the eaves along the edge of the roof of the house 3. Rainwater that falls on the roof flows into the horizontal gutter 31. The horizontal gutter 31 collects the rainwater that flows down from the roof and guides it to the downspout 32.

[0039] The downspout 32 is attached to the exterior wall of the house 3 so as to extend vertically along the exterior wall. The upper end of the downspout 32 is connected to the horizontal gutter 31 via a main gutter and a water collector, etc. The downspout 32 extends underground, and the lower end of the downspout 32 is connected to one end of an underground pipe 40. The underground pipe 40 is buried in the ground in the yard from the lower end of the downspout 32 to a shallow part of the dried-up pond 14, and the other end of the underground pipe 40 is connected to an overflow basin 42. The underground pipe 40 may be inclined downward from the downspout 32 toward the overflow basin 42. The downspout 32 guides rainwater flowing from the horizontal gutter 31 to the underground pipe 40 underground. The underground pipe 40 guides rainwater flowing from the downspout 32 to the overflow basin 42. The lower end of the downspout 32 may be directly connected to the overflow basin 42 .

[0040] The branch joint 34 is located midway between the upper and lower ends of the downspout 32. The portion of the downspout 32 above the branch joint 34 is called the upper downspout 32a, and the portion below the branch joint 34 is called the lower downspout 32b. The branch joint 34 is connected to the lower end of the upper downspout 32a, the upper end of the lower downspout 32b, and one end of a connecting pipe 36. The other end of the connecting pipe 36 is connected to the top of a water tank 38. The water tank 38 is installed on the ground in the garden, close to the exterior wall of the house 3. The water tank 38 may be placed directly on the ground or on a pedestal on the ground. The water tank 38 is located above the ground in the rainwater infiltration zone 12. The water tank 38 is a resin rainwater tank. The water tank 38 has a faucet 38a at the bottom of its side. When the faucet 38a is opened, rainwater inside the water tank 38 is discharged through the faucet 38a. This water can be used for cleaning, watering plants, or daily life during a water outage. The water tank 38 has an air vent on the upper side or top surface. The position of the air vent is the maximum water level limit of the water tank 38. A filtration layer may be provided inside the water tank 38, and the rainwater stored in the water tank may be filtered by the filtration layer, and the filtered water may be discharged from the faucet 38a.

[0041] The branch joint 34 divides and guides rainwater flowing down the upper downspout 32a to the lower downspout 32b and the connecting pipe 36. When the water tank 38 is full, the water levels in the water tank 38 and the connecting pipe 36 reach the branch joint 34, causing the branch joint 34 to overflow the water in the connecting pipe 36 into the lower downspout 32b.

[0042] FIG. 3 is a longitudinal cross-sectional view of the branch joint 34. As shown in FIG. 3, the branch joint 34 includes an upper connecting portion 34a, an upper main body 34b, a water distribution plate 34c, a lower main body 34f, a branch port 34h, and a lower connecting portion 34g. The upper connecting portion 34a, the upper main body 34b, and the lower connecting portion 41f are tubular. The upper connecting portion 41a is connected to the upper downspout 32a so as to hold the lower end of the upper downspout 32a. The upper main body 34b is connected to the lower portion of the upper connecting portion 34a. The water distribution plate 34c is provided in a perimeter hole 34e at the lower end of the upper main body 34b. The water distribution plate 34c has a center hole 34d in its center and multiple perimeter holes 34e surrounding the center hole 34d. The lower main body 34f is connected to the lower end of the upper main body 34b. The branch port 34h is connected to a side surface of the lower main body 34f. The branch port 34h is connected to one end of the connecting pipe 36. The lower connecting portion 34g is inserted into the lower main body 34f from the lower end of the lower main body 34f until the height of the upper end of the lower connecting portion 34g reaches the height of the vertical middle portion of the branch port 34h. The upper end of the lower connecting portion 34g is located below the maximum limit water level in the water tank 38 and above the position where the connecting pipe 36 is connected to the water tank 38. The upper part of the portion of the lower connecting portion 34g inserted into the lower main body 34f is separated from the inner circumferential surface of the lower main body 34f. The lower part of the portion of the lower connecting portion 34g inserted into the lower main body 34f is in close contact with the inner circumferential surface of the lower main body 34f. The lower end of the lower connecting portion 34g is connected to the upper end of the lower downspout 32b.

[0043] Rainwater flowing down from the upper downspout 32a flows into the upper body 34b through the upper connection part 34a, and then hits the water distribution plate 34c, where it is divided into the center and the periphery. The rainwater divided into the center passes through a center hole 34d of the water dividing plate 34c, flows to the inside of the lower connection part 34g in the lower body 34f, and further flows down to the lower downspout 32b. The rainwater divided into the perimeter flows through the perimeter holes 34e of the water distribution plate 34c and flows to the outside of the lower connection part 34g within the lower body 34f. If the water tank 38 is not full, the rainwater that flows to the outside of the lower connection part 34g flows through the branch port 34h and the connecting pipe 36 into the water tank 38. This allows the rainwater to accumulate in the water tank 38. When the water tank 38 is full, the water level in the water tank 38 is determined by the height of the upper end of the lower connection part 34g. If the water tank 38 is full, the water level inside the water tank 38 and the connecting pipe 36 reaches the upper end of the lower connection part 34g, causing the rainwater to overflow from the outside of the lower connection part 34g to the inside. Therefore, most of the rainwater that flows from the upper downspout 32a into the branch joint 34 flows into the lower downspout 32b.

[0044] The water diversion plate 34c also functions as a strainer, capturing debris in rainwater. By removing the upper connector 34a from the upper body 34b while the upper downspout 32a remains fitted into the upper connector 34a, debris accumulated inside the upper body 34b can be drained. After removing the debris, the upper connector 34a can be lowered onto the upper body 34b below while the upper downspout 32a remains fitted into the upper connector 34a, and connected to the upper body 34b.

[0045] As shown in Figures 1 and 2, the overflow box 42 is buried in the ground in a shallow part of the dry-up pond 14. The upper part of the overflow box 42 is exposed from the ground at the bottom of the dry-up pond 14. The outer shape of the overflow box 42 is cylindrical or rectangular prism-shaped, and the overflow box 42 is hollow. The upper end of the overflow box 42 may be a detachable cover for the box body below it. The overflow box 42 has an overflow outlet 42a at the upper end or on the side. If the overflow outlet 42a is formed on the side of the overflow box 42, the overflow outlet 42a is spaced apart from the lower end of the overflow box 42 towards the upper end. The entire upper end of the overflow basin 42 may be open, and this opening may be an overflow outlet 42a. In this case, a punching plate, wire mesh, or strainer is installed at the opening to prevent the first crushed stone 18 (described below) from falling into the overflow basin 42. The overflow outlet 42a is not buried in the shallow part of the dry-up pond 14, but is exposed from the ground at the bottom of the dry-up pond 14. The depth of the overflow outlet 42a is, for example, 50 mm from the ground surrounding the dry-up pond 14. The overflow basin 42 is a non-permeable rainwater basin. The overflow basin 42 is made of resin, metal, reinforced concrete, or a composite of two or more of these materials. For example, the overflow basin 42 is made of polyvinyl chloride resin.

[0046] The overflow basin 42 is disposed below the first crushed stones 18. The portion of the overflow basin 42 that is exposed above the ground at the bottom of the dry pond 14 is hidden below the first crushed stones 18.

[0047] During rainy weather, rainwater flows into the overflow basin 42 through the downspout 32 and underground pipe 40. When the water level of the rainwater stored in the overflow basin 42 exceeds the overflow outlet 42a of the overflow basin 42, the rainwater is discharged from the overflow basin 42 through the overflow outlet 42a into the dry pond 14. The discharged rainwater appears to spring from the first crushed stone 18 into the dry pond 14.

[0048] The collection basin 50 is buried in the ground deep in the dry-up pond 14. The collection basin 50 is positioned away from the overflow basin 42. The top of the collection basin 50 is exposed from the ground at the bottom of the dry-up pond 14. The outer shape of the collection basin 50 is cylindrical or rectangular prism-shaped, and the collection basin 50 is hollow. The upper end of the collection basin 50 may be a detachable cover for the basin main body below. The collection basin 50 has a water intake 50a at its upper end or on its side. If the water intake 50a is formed on the side of the collection basin 50, the water intake basin 50a is spaced apart from the bottom end of the collection basin 50 towards the top end. The entire top end of the collection basin 50 may be open, and this opening may be the intake basin 50a. In this case, a punching plate, wire mesh, or strainer is installed at the opening to prevent the second crushed stone 20 (described later) from falling into the collection basin 50. The intake basin 50a is not buried in the ground at a deep part of the dry-up basin 14, but is exposed from the ground at the bottom of the dry-up basin 14. The depth of the intake basin 50a is equal to the depth of the overflow outlet 42a of the overflow basin 42. The depth of the intake basin 50a may be deeper than the depth of the overflow outlet 42a of the overflow basin 42. The depth of the intake basin 50a is 50 mm from the ground surrounding the dry-up basin 14. The depth from the intake basin 50a to the bottom of the collection basin 50 is deeper than the depth from the overflow outlet 42a of the overflow basin 42 to the bottom of the overflow basin 42. The catch basin 50 is a non-permeable rainwater catch basin. The catch basin 50 may be a permeable rainwater catch basin with permeation holes on the side or bottom. The catch basin 50 is made of resin, metal, reinforced concrete, or a composite of two or more of these. For example, the catch basin 50 is made of polyvinyl chloride resin.

[0049] When the water level of rainwater that has overflowed from the overflow basin 42 into the dry pond 14 reaches the intake 50a of the catchment basin 50, the rainwater flows through the intake 50a into the catchment basin 50. The depth of the intake basin 50a is deeper than the depth of the ground around the overflow basin 14, which is "0 mm," thereby preventing rainwater from overflowing from the dry pond 14 onto the surrounding ground. The rainwater that flows into the catchment basin 50 is collected in the catchment basin 50.

[0050] The drain pipe 52 is buried underground from the catchment basin 50 to a sewer outside the premises. One end of the drain pipe 52 is connected to the catchment basin 50, and the other end of the drain pipe 52 is connected to the sewer. The drain pipe 52 may be sloped downward from the catchment basin 50 toward the sewer. When the water level of the rainwater stored in the catchment basin 50 reaches the point where the drain pipe 52 is connected to the catchment basin 50, the rainwater flows from the catchment basin 50 into the drain pipe 52. The drain pipe 52 directs the rainwater to the sewer. One or more rainwater basins may be provided midway along the drainage pipe 52. The rainwater basins may be permeable or non-permeable, or both permeable and non-permeable basins may be used.

[0051] <2. Modifications> The following describes changes from the above-described embodiment. Only one of the changes (1) to (3) described below may be adopted, or two or more of the changes (1) to (3) may be applied in combination.

[0052] (1) The exterior structure 1 may have a carport. In this case, a rain gutter may be piped from the carport roof to the upper downspout 32a, and rain that falls on the carport may be guided to the upper downspout 32a by the rain gutter. Alternatively, the carport's downspout may be piped from the carport roof to the ground along the pillars supporting the carport roof, and the lower end of the downspout may be connected to the underground pipe 40 via a second underground pipe. Then, just as the water tank 38 is connected to the downspout 32 via the connecting pipe 36 and branch joint 34, the carport's water tank is connected to the carport's downspout via a connecting pipe and branch joint.

[0053] (2) As shown in Fig. 4, crushed stone 51 may be contained in a catchment basin 50. The catchment basin 50 functions as an infiltration basin. Instead of burying the catchment basin 50 in the same place, crushed stone 51 may be buried in that place, and the end of the drainage pipe 52 may open at the side of the hole where the crushed stone 51 is buried.

[0054] (3) As shown in Figure 4, a permeation layer 15 made of crushed stone may be deposited under the bottom of the dry pond 14. The permeation layer 15 may be exposed at the bottom of the dry pond 14, or soil and sand may be deposited on top of the permeation layer 15. If soil is deposited on the permeation layer 15, grass may be grown on the soil. If the permeation layer 15 is formed, permeation holes may be formed on the side of the catchment basin 50, and rainwater that has permeated the permeation layer 15 may seep into the catchment basin 50 through the permeation holes. If such a permeation layer 15 is formed, the water retention capacity of the rainwater permeation zone 12 will be increased. Note that the changes listed in (2) and the changes listed in (3) may be adopted together.

[0055] <3. Summary> (1) During rainy weather, rainwater is guided to the water tank 38 by the rainwater guide path 30, and the rainwater is stored in the water tank 38. Rainwater that does not flow into the water tank 38 is guided to the overflow bin 42 by the rainwater guide path 30, and the rainwater is stored in the overflow bin 42. After the water tank 38 is full, rainwater that overflows from the water tank 38 is also guided to the overflow bin 42 by the rainwater guide path 30, and the rainwater is stored in the overflow bin 42. Even if the rainwater in the overflow bin 42 overflows from the overflow outlet 42a of the overflow bin 42, the rainwater is stored in the dry pond 14. When the rainwater level inside the dry pond 14 reaches the intake 50a of the catchment basin 50, the rainwater flows through the intake 50a into the catchment basin 50 and is stored in the catchment basin 50. By storing rainwater in four locations - the water tank 38, the overflow basin 42, the dry pond 14, and the catchment basin 50 - the amount of rainwater discharged into the sewer system is reduced. Therefore, this exterior structure 1 contributes to preventing inland flooding.

[0056] (2) Because some of the rainwater inside the dry pond 14 seeps into the ground, the amount of rainwater discharged into the sewer system is reduced, which also contributes to preventing inland flooding.

[0057] (3) When it rains, rainwater is stored in the dry pond 14, making it appear as if a pond has appeared. If the rain continues to fall, you can see the water flowing from the overflow basin 42 to the catchment basin 50. After the rain stops, the rainwater inside the dry pond 14 seeps into the ground or evaporates, making the pond appear to have dried up and disappeared. These things contribute to improving the appeal of the exterior structure 1.

[0058] (4) Because the bottom of the dry pond 14 slopes downward from the overflow basin 42 toward the catchment basin 50, when it starts to rain and rainwater begins to overflow from the overflow basin 42, the water flow from the overflow basin 42 toward the catchment basin 50 can be seen. Even if rainwater collects in the recess 14, if the recess 14 is shallow, the water flow from the overflow basin 42 toward the catchment basin 50 can be seen. Such water flow during rainy weather contributes to improving the appearance of the exterior structure 1.

[0059] (5) The slope of the bottom of the dry pond 14 allows debris such as dead leaves contained in rainwater to be collected near the catch basin 50. This makes cleaning the dry pond 14 easy.

[0060] (6) Mud and other substances tend to mix with the rainwater inside the dry pond 14, and since the catchment basin 50 is deeper than the overflow basin (42), a large amount of mud and other substances in the rainwater accumulates in the catchment basin 50.

[0061] (7) The drain pipe 52 is connected to the catch basin 50 and the sewer, so that the rainwater stored in the catch basin 50 is discharged into the sewer.

[0062] (8) Because the plants 16 are planted on the bottom of the dry pond 14, around the dry pond 14, or both, rainwater can easily infiltrate into the ground. By allowing rainwater to infiltrate into the ground, the amount of rainwater discharged into the sewer system is reduced and rainwater pollution is eliminated. This prevents inland flooding and reduces the burden on the environment.

[0063] (9) Natural grass is planted on the bottom of the pond 14, around the pond 14, or both, allowing rainwater to easily penetrate into the ground. This prevents inland flooding and reduces the burden on the environment.

[0064] (10) Since the first crushed stones 18 are piled on top of the overflow basin 42, the overflow basin 42 is hidden under the first crushed stones 18, improving the design of the exterior structure 1. In addition, during rainy weather, rainwater appears to spring from the first crushed stones 18, which contributes to improving the aesthetic appeal of the exterior structure 1.

[0065] (11) Since the second crushed stones 20 are piled on top of the catch basin 50, the catch basin 50 is hidden under the second crushed stones 20, improving the design of the exterior structure 1. In addition, during rainy weather, rainwater appears to seep in between the second crushed stones 20, which contributes to improving the aesthetic appeal of the exterior structure 1.

[0066] (12) Since the depth from the ground surrounding the dry pond 14 to the overflow outlet 42a is equal to the depth from the ground surrounding the dry pond 14 to the intake 50a, the maximum water level of rainwater stored in the dry pond 14 is adjusted to the depth of the overflow outlet 42a and the intake 50a.

[0067] (13) If House 3 is a wooden house, the energy used from the production to the disposal and disposal of wood is less than the energy used from the production to the disposal and disposal of metal or concrete materials. Therefore, House 3 contributes to the realization of a decarbonized society by promoting carbon neutrality, which reduces carbon dioxide emissions to virtually zero, and to the achievement of the Sustainable Development Goals (SDGs).

[0068] (14) As mentioned above, the Outer Structure 1 contributes to reducing the burden on the environment and sewerage system. Ultimately, the Outer Structure 1 contributes to the creation of a town where everyone can live safely, resilient to disasters, and able to continue living. [Explanation of symbols]

[0069] 1. Exterior 3. Housing 14 Dry pond (depression) 16 Planting 18 First Crushed Stone 20 Second Crushed Stone 30 Rainwater guideway 32 Downpipe 32a Upper Downspout 32b Lower downspout 34 Branch joint 38 Water Tank 42 Overflow box 42a Overflow mouth 50 Water collection basin 50a Water Intake 52 Drain pipe

Claims

1. An exterior structure constructed outside a house, A rainwater storage tank, a recess formed in a concave shape on the ground of a garden outside the house; an overflow basin that is buried in the ground in the recess, is partially exposed above the ground, has an overflow outlet in the exposed part, collects rainwater up to the overflow outlet, and overflows the rainwater from the overflow outlet into the recess; A rainwater guideway that guides rainwater that falls on the carport or the roof of the house to the water tank and the overflow basin and guides rainwater that overflows from the water tank when the water tank is full to the overflow basin; a catchment basin that is buried in the ground of the recess at a position away from the overflow basin, is partially exposed above ground, has a water intake port at the exposed portion, and takes in and stores rainwater that has accumulated in the recess up to the water intake port through the water intake port; An exterior structure characterized by the following:

2. The exterior structure according to claim 1, The recess has a bottom that slopes downward from the overflow basin toward the catch basin. The exterior is characterized by:

3. The exterior structure according to claim 1 or 2, The depth from the intake to the bottom of the catchment basin is greater than the depth from the overflow outlet to the bottom of the overflow basin. The exterior is characterized by:

4. The exterior structure according to claim 1 or 2, A drainage pipe that is buried underground from the catchment basin to the sewer and is connected to the catchment basin and the sewer. An exterior structure characterized by the following:

5. The exterior structure according to claim 1 or 2, Plants planted at the bottom of the recess, around the recess, or both. An exterior structure characterized by the following:

6. The exterior structure according to claim 1 or 2, Natural grass planted at the bottom of the recess, around the recess, or both. An exterior structure characterized by the following:

7. The exterior structure according to claim 1 or 2, The first crushed stone piled on top of the overflow basin An exterior structure characterized by the following:

8. The exterior structure according to claim 1 or 2, The second crushed stone piled on top of the catch basin An exterior structure characterized by the following:

9. The exterior structure according to claim 1 or 2, The depth from the ground around the recess to the overflow outlet is equal to the depth from the ground around the recess to the intake outlet. The exterior is characterized by:

10. The exterior structure according to claim 1 or 2, The stormwater guideway, an upper downspout attached to the exterior wall of the house so as to extend vertically along the exterior wall; a branch joint connected to a lower end of the upper downspout and the water tank; a lower downspout attached to the exterior wall so as to extend vertically along the exterior wall from the branch joint to the ground; and The branch joint guides rainwater flowing down the upper downspout to the lower downspout and the water tank, and when the water tank is full, causes rainwater to overflow from the water tank into the lower downspout. The exterior is characterized by:

Images