Rainwater infiltration device

Abstract

To provide a rainwater infiltration device that achieves both rainwater infiltration performance and appearance and durability. [Solution] A rainwater infiltration device 10 that allows rainwater to infiltrate into the ground, which is made of ceramic and has a cylindrical main body 12 with multiple through holes 14 formed therein, and is characterized in that the buried portion 18 of the main body 12 that is buried in the ground is made of an unglazed ceramic base material, and the surface of the protruding portion 16 of the main body 12 that protrudes above the ground surface has a glaze layer formed on it.

Description

[Technical Field]

[0001] This invention relates to a rainwater infiltration device. [Background technology]

[0002] In recent years, with the progress of urbanization, the paved areas of residential areas and roads have increased, and the amount of rainwater that permeates into the ground during rainfall has tended to decrease. As a result, during heavy rainfall, rainwater flows into sewers and rivers in a short period of time, which can cause inland flooding and river overflows. To address this problem, rainwater infiltration devices that allow rainwater to permeate into the ground are widely used.

[0003] Conventional rainwater infiltration devices include infiltration boxes, infiltration trenches, and infiltration wells. These generally employ a structure in which a cylindrical main body is buried underground and rainwater is allowed to infiltrate into the surrounding ground through holes or slits formed in the main body.

[0004] For example, Patent Document 1 discloses a construction method for rainwater infiltration products in which, when burying rainwater infiltration products with holes and slits formed in them underground, a water-permeable sheet material that appears to block the holes and slits is placed between them, and recycled resource materials are filled on the outside. According to Patent Document 1, clogging is prevented by the penetration of fine particles, and the rainwater infiltration function can be continuously maintained. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-168984 Summary of the Invention [Problem to be solved by the invention]

[0006] In rainwater infiltration devices such as infiltration manholes, the parts buried underground are required to have high permeability to allow rainwater to efficiently infiltrate into the surrounding ground. On the other hand, the parts protruding above ground are required to suppress the adhesion of rainwater and dirt and ensure aesthetics and durability. However, in conventional rainwater infiltration devices, the entire main body is constructed of the same material and surface condition, making it difficult to fully satisfy these conflicting requirements. As a result, the parts exposed to the ground are prone to adhesion of dirt and deterioration of appearance, and the parts buried underground are not necessarily optimally configured in terms of infiltration performance.

[0007] The present invention was made in consideration of the above-mentioned problems, and aims to provide a rainwater infiltration device that can achieve both rainwater infiltration performance and appearance and durability. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention provides a rainwater infiltration device that allows rainwater to infiltrate into the ground, and is characterized by having a cylindrical main body made of ceramic and having a plurality of through holes formed therein, and the buried portion of the main body that is buried in the ground is made of an unglazed ceramic base material, and the surface of the protruding portion of the main body that protrudes above the ground surface is coated with a glaze layer.

[0009] In the rainwater infiltration device, the plurality of through holes are formed in one or both of the buried portion and the protruding portion.

[0010] The rainwater infiltration device is characterized by including a lid body that covers the opening on the protruding portion side.

[0011] The rainwater infiltration device is characterized in that it comprises a plurality of types of filler materials stacked in layers inside the main body, and the plurality of types of filler materials include a porous material.

[0012] In the rainwater infiltration device, the plurality of types of filling materials are selected from the group consisting of charcoal, stone, brick, pottery, and straw. [Effects of the Invention]

[0013] The rainwater infiltration device of the present invention can achieve both rainwater infiltration performance and appearance and durability. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view of a rainwater infiltration device according to an embodiment of the present invention; [Figure 2] Cross-sectional view showing the installation target of the rainwater infiltration device DETAILED DESCRIPTION OF THE INVENTION

[0015] A rainwater infiltration device according to an embodiment of the present invention will be described with reference to the drawings.

[0016] The rainwater infiltration device according to this embodiment is a ceramic device that infiltrates rainwater into the ground. As shown in FIG. 1, the rainwater infiltration device 10 has a main body 12 formed in a cylindrical shape with both ends open. In this embodiment, the main body 12 is formed vertically, with a height of 70 cm and a diameter of 25 cm. A plurality of through holes 14 are formed on the periphery of the main body 12, and each through hole 14 has a diameter of 45 mm. The dimensions of the main body 12 and the through holes 14 are set appropriately depending on the installation environment and the desired infiltration performance, and are not limited to the above-mentioned numerical values.

[0017] The rainwater infiltration device 10 (main body 12) is made from Shigaraki clay, which contains feldspar, quartz, and clay minerals, with chamotte added as needed, and a cylindrical molded body is formed through a molding process. Then, during the drying process, i.e., in the semi-dried state, holes are drilled to form through-holes 14. After the drying process, bisque firing is performed to form a bisque body. A glaze is applied to one open end of this bisque body, in an area including at least one through-hole 14. The rainwater infiltration device 10 is then completed through a firing process.

[0018] As shown in FIG. 2, the rainwater infiltration device 10 is buried in the ground with its cylindrical axis oriented vertically. The glazed portion 16 is positioned so that it protrudes above the ground surface. Multiple types of filler materials are layered within the main body 12. Specifically, from bottom to top, a layer 30 is layered, consisting of straw, waste pottery (including crushed pottery fragments), crushed stone, and charcoal. A layer consisting of rubble or bricks may also be provided. Among the filler materials, charcoal and straw are porous in themselves (the material itself). Furthermore, waste pottery and bricks are porous in themselves (the material itself), and their porous structure is formed by interparticle voids formed by gaps between the materials. Furthermore, crushed stone and rubble are porous in themselves due to interparticle voids formed by gaps between the materials. In this specification, materials that have a porous structure or that form voids by assembling materials together, allowing rainwater to pass through, are referred to as "porous materials."

[0019] When the rainwater infiltration device 10 is installed as described above, rainwater flows into the main body 12 through the through-holes 14 provided in the portion protruding above ground level. This rainwater passes through the filling material filled inside the main body 12 and flows out into the ground from the open end of the main body 12, the through-holes 14, or the fine holes (porous portions) formed in the main body 12.

[0020] The rainwater infiltration device 10 according to this embodiment includes a cylindrical ceramic main body 12, and the main body 12 is configured such that the buried portion 18 buried in the ground and the protruding portion 16 protruding above the ground surface have different surface conditions. That is, the buried portion 18 buried in the ground is made of an unglazed ceramic base material, allowing rainwater to efficiently infiltrate into the surrounding ground through the porous structure of the ceramic base material and the multiple through-holes 14 formed in the main body 12. This allows for the realization of a rainwater infiltration device 10 with excellent rainwater infiltration performance.

[0021] On the other hand, a glaze layer is formed on the surface of the protruding portion 16 that protrudes above ground level, which reduces the water absorption of the protruding portion 16 and makes it difficult for rainwater and dirt to adhere to the protruding portion 16. This makes it possible to maintain the beauty and improve the durability of the portion 16 that is exposed above ground level.

[0022] Thus, with the rainwater infiltration device 10 according to this embodiment, it is possible to appropriately use different surface conditions depending on the functions required for the part 18 buried underground and the part 16 protruding above ground, even though the same ceramic main body 12 is used. As a result, it is possible to achieve a high level of both rainwater infiltration performance and good appearance and durability.

[0023] Furthermore, by making the main body 12 from ceramic, it is possible to provide excellent weather resistance and durability, and also to provide a stable rainwater infiltration function for a long period of time.

[0024] The rainwater infiltration device of this embodiment not only functions to infiltrate rainwater into the ground during rainfall, but also functions to absorb and discharge underground moisture even when there is no rainfall. Because the main body is made of an unglazed ceramic substrate, the main body has a porous structure, allowing it to absorb moisture from the surrounding ground through capillary action and other mechanisms. Furthermore, the absorbed moisture can be discharged from the inside of the device to the outside through through-holes and openings formed in the main body. This allows excess moisture to be drawn into the device and released to the ground surface or through other infiltration channels when there is excessive moisture in the ground. As a result, the device functions to adjust the moisture balance in the ground, regardless of whether there is rainfall, thereby alleviating excessively wet ground conditions.

[0025] The rainwater infiltration device of the present invention not only functions to infiltrate rainwater into the ground by itself, but also has the effect of directing water by arranging multiple rainwater infiltration devices consecutively at predetermined intervals. By arranging multiple rainwater infiltration devices underground from areas with poor drainage toward areas with good drainage or areas where rainwater can be collected, each device functions as a local infiltration point, gradually promoting water movement underground. As a result, rainwater moves continuously through multiple rainwater infiltration devices without relying on a single infiltration device, and is directed in the desired direction. For example, even if there are areas on a site where water accumulation is likely to occur, arranging rainwater infiltration devices from the water accumulation area toward areas with good drainage can alleviate uneven water distribution on the surface and underground, improving drainage throughout the site. Furthermore, this water directing effect is achieved by utilizing the infiltration function of the rainwater infiltration device itself, without the need for underdrain piping or slope construction, making construction easy and enabling improved drainage while minimizing impact on the landscape and surrounding environment.

[0026] Furthermore, in this embodiment, a plurality of layers 30 are formed from a plurality of types of porous materials within the main body 12. This provides the following advantageous effects.

[0027] Porous materials allow rainwater to pass through the pores and interparticle voids within the material, creating three-dimensional rainwater flow paths. As a result, rainwater does not stagnate within the device, but instead smoothly infiltrates into the surrounding ground, improving rainwater infiltration performance.

[0028] Porous materials have continuous pores, which means that fine sediment and suspended matter contained in rainwater are less likely to accumulate locally. This means that compared to structures that rely on a single flow path, clogging is less likely to occur and stable infiltration can be maintained for a long period of time.

[0029] Porous materials can temporarily retain rainwater within their pores and voids, allowing it to be slowly released into the ground during rainfall. This prevents large amounts of rainwater from flowing into the ground in a short period of time, reducing the load on the ground.

[0030] The surface and internal pores of porous materials have a structure that allows suspended solids and impurities in rainwater to easily adhere to them. As a result, a physical filtration action occurs as rainwater passes through the porous material, resulting in the purified rainwater seeping into the ground.

[0031] By using straw, waste pottery, crushed stone, charcoal, rubble, bricks, etc. as porous materials, natural and recycled materials can be effectively utilized, resulting in a rainwater infiltration device 10 that contributes to reducing environmental impact and promoting resource recycling.

[0032] Although the embodiment of the present invention has been described, the present invention is not limited to the embodiment and may be modified as follows.

[0033] In the above embodiment, a lid may be provided to cover the open end protruding above ground level.

[0034] The order of the layers formed in the main body 12 is not limited to the order in the above embodiment, and can be changed as appropriate.

[0035] In the above embodiment, a plurality of circular through holes 14 are formed in the circumferential direction, but the shape of the through holes 14 is not limited to circular and may be elliptical, elongated, slit-shaped, etc. Furthermore, although the through holes 14 are formed around the entire circumference of the main body 12, they may be formed only in a portion of the circumference.

[0036] In the above embodiment, a glaze layer is formed by applying glazing to one opening end side of the main body portion 12, but the area in which the glaze layer is formed may be an area located above the ground surface or a predetermined area including the vicinity of the ground surface.

[0037] In this embodiment, straw, waste pottery, crushed stone, and charcoal are used, but the filler material is not limited to these, and any material that has a porous structure or that can form interparticle voids between materials, such as rubble, bricks, glass fragments, pumice, and volcanic gravel, can be used as appropriate.

[0038] In the above embodiment, the main body 12 is disposed vertically, but it may be disposed at a slight incline depending on the ground conditions and the installation environment. [Explanation of symbols]

[0039] 10 Rainwater infiltration device 12 Main body 14 through holes 16 Protrusion 18 Buried section 30 layers

Claims

1. A rainwater infiltration device that allows rainwater to infiltrate into the ground, The device is made of ceramic and has a cylindrical body portion with a plurality of through holes formed therein, In the main body, the buried portion to be buried in the ground is made of an unglazed ceramic base material, A rainwater infiltration device characterized in that a glaze layer is formed on the surface of the protruding portion of the main body that protrudes above the ground surface.

2. The rainwater infiltration device according to claim 1, wherein the plurality of through holes are formed in one or both of the buried portion and the protruding portion.

3. The rainwater infiltration device according to claim 1 , further comprising a lid for covering the opening on the protruding portion side.

4. A plurality of types of filler materials are provided inside the main body portion and stacked in layers, The rainwater infiltration device according to claim 1 , wherein the plurality of types of filling materials include a porous material.

5. The rainwater infiltration device according to claim 4, wherein the plurality of types of filler materials are selected from the group consisting of charcoal, stone, brick, waste pottery, and straw.

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