Rainwater infiltration basins and rainwater infiltration trenches

Abstract

To provide a rainwater infiltration basin and rainwater infiltration trench that eliminate the need to install a permeable sheet. [Solution] The rainwater infiltration basin 1 comprises a connection part 2 to which a rainwater pipe is connected, and a storage and infiltration part 3 installed below the connection part 2 to temporarily store rainwater and allow it to infiltrate into the ground. The storage and infiltration part 3 consists of an upper bottom plate 31 integrated with a permeable sheet 41, and a plurality of side plates 32, etc., each integrated with a permeable sheet 42. The rainwater infiltration trench 1A comprises a storage and infiltration part 3 to which rainwater is temporarily stored and allows it to infiltrate into the ground. The storage and infiltration part 3 is an end plate 33 to which a rainwater pipe is connected, and consists of an end plate 33 integrated with a permeable sheet, an upper bottom plate 31 integrated with a permeable sheet, and side plates 32 integrated with a permeable sheet.

Description

Technical Field

[0001] The present invention relates to a rainwater infiltration basin.

Background Art

[0002] In recent years, in the field of rainwater infiltration basins, rainwater infiltration basins made of synthetic resin that are lighter than conventional ones have been developed and provided. This synthetic resin rainwater infiltration basin is formed into a hollow box shape, temporarily stores rainwater inside, and is configured to have water-permeable holes in the bottom plate and peripheral wall, so that rainwater infiltrates into the ground through the water-permeable holes.

[0003] In such a synthetic resin rainwater infiltration basin, the entire basin is covered with a water-permeable sheet made of non-woven fabric or the like to prevent foreign matter such as sediment from entering the interior through the water-permeable holes provided in the bottom plate and peripheral wall. This water-permeable sheet is mainly composed of a single large sheet material and wraps the entire basin, but the work of wrapping the entire basin inside the narrow opening excavated in the ground for installing the rainwater infiltration basin is extremely complicated.

[0004] Accordingly, for example, the infiltration basin described in Patent Document 1 discloses a configuration in which, in the water-permeable sheet for the side plate, folded portions that are folded back to the inner surface or the outer surface of the basin main body are provided at the end edge on the bottom plate side and the end edge on the top plate side. As a result of the folded portions being sandwiched between the inner surface of the connecting protrusion and the surface of the end edge of the side plate in this way, the water-permeable sheet for the side plate is fixed on the outer surface of the basin main body, and positional displacement is suppressed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in conventional configurations, including those described in Patent Document 1, it was necessary to install the manhole body after installing the permeable sheet, or to assemble the manhole body while holding the permeable sheet in a predetermined position and tucking in the ends of the permeable sheet. As a result, the process of installing the permeable sheet was extremely complicated.

[0007] Therefore, the present invention aims to provide a rainwater infiltration basin and a rainwater infiltration trench that eliminate the need to install a permeable sheet. [Means for solving the problem]

[0008] To achieve the above objective, the rainwater infiltration basin of the present invention comprises a connection section to which a rainwater pipe is connected, and a storage and infiltration section installed below the connection section to temporarily store rainwater and allow it to infiltrate into the ground. The storage and infiltration section consists of an upper bottom plate integrated with a permeable sheet and a plurality of side plates integrated with the permeable sheet. [Effects of the Invention]

[0009] As described above, the rainwater infiltration basin of the present invention comprises a connection section to which a rainwater pipe is connected, and a storage and infiltration section installed below the connection section to temporarily store rainwater and allow it to infiltrate into the ground. The storage and infiltration section consists of an upper bottom plate integrated with a permeable sheet and a plurality of side plates integrated with the permeable sheet. With this configuration, the storage and infiltration section can be completed by assembling the upper bottom plate and the side plates, thus eliminating the need to install a permeable sheet, resulting in a rainwater infiltration basin. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view illustrating the overall configuration of the rainwater infiltration basin in Example 1. [Figure 2] This is a partially cutaway perspective view illustrating the overall structure of the rainwater infiltration basin in Example 1. [Figure 3] This is a perspective view of the upper base plate, shown by tearing a portion of the permeable sheet, from the outer side. [Figure 4] This is a perspective view of the top base plate from the inside. [Figure 5] This is a perspective view of the side panel, which is shown by tearing a portion of the permeable sheet, as seen from the outside. [Figure 6] This is a perspective view of the side panel from the inside. [Figure 7] This is a perspective view of the assembled storage and infiltration unit. [Figure 8] This is a perspective view illustrating the overall configuration of the rainwater infiltration trench in Example 2. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the drawings. However, the components described in the following embodiments are illustrative and are not intended to limit the technical scope of the present invention to them alone. [Examples]

[0012] (composition) First, the overall configuration of the rainwater infiltration basin 1 of this embodiment will be explained using Figures 1 and 2. The rainwater infiltration basin 1 of this embodiment is entirely buried underground. As shown in Figures 1 and 2, the rainwater infiltration basin 1 consists of a connection section 2, which is an upper unit to which a rainwater pipe (not shown) is connected, and a storage and infiltration section 3, which is a lower unit installed below the connection section 2 to temporarily store rainwater and allow it to infiltrate into the ground.

[0013] In other words, the upper unit, the connecting section 2, has the following functions 1) to 3). 1) Rainwater collection: Collects rainwater that flows down from roofs, roads, etc. 2) Debris and mud capture (sedimentation function): Prevents debris such as fallen leaves and gravel from flowing into the ground. Therefore, it has a structure that is easy to maintain. 3) Flow rate regulation: If water seeps in too quickly, the surrounding ground will weaken, so it plays a role in regulating the flow at an appropriate pace.

[0014] On the other hand, the lower unit, the storage and infiltration section 3, has the following functions 1) to 3). 1) Rainwater underground infiltration: It has a porous structure that allows rainwater to gradually seep into the ground. 2) Promotion of groundwater recharge: The infiltrated water is stored as groundwater, which becomes the source of well water and spring water. 3) Water purification: By passing through the sand and soil in the ground, impurities in rainwater are naturally filtered out.

[0015] As shown in Figures 1 and 2, the connection portion 2, which is the upper unit, is formed of synthetic resin. The connection portion 2 is formed in a cross shape (plus shape) in side view, by connecting horizontally extending horizontal pipe portions 22, 22 to a vertically extending vertical pipe portion (rising pipe) 21 in an intersecting manner. In the embodiment, the case of providing two horizontal pipe portions 22, 22 has been described, but the present invention is not limited to this, and the number of horizontal pipe portions may be one, or three or more.

[0016] As shown in Figure 2, the lower end of the vertical pipe portion 21 is fitted into a circular hole 31a provided on the upper surface of the storage and infiltration portion 3. Therefore, the basket portion 23 fitted to the lower end of the vertical pipe portion 21 is installed in a state of protruding into the storage and infiltration portion 3. On the other hand, the upper end of the vertical pipe portion 21 is closed by a lid portion (not shown). A rainwater pipe (not shown) is connected to each of the horizontal pipe portions 22, 22.

[0017] As shown in Figures 1 and 2, the storage and infiltration portion 3, which is the lower unit, is configured in a cubic shape from two upper and lower bottom plates 31, 31 and four side plates 32, ..., 32. In the present embodiment, the case where the same upper bottom plate 31 is commonly used for the upper surface and the bottom surface of the storage and infiltration portion 3 has been described, but the present invention is not limited to this, and different members may be used for the upper surface and the lower surface.

[0018] As shown in Figures 3 and 4, the upper base plate 31 is formed as a grid-like plate from synthetic resin. A circular hole 31a for receiving the connecting part 2 is formed in the center of the surface of the upper base plate 31. The cross-section of each grid of the upper base plate 31 is T-shaped, with a smooth outer surface and ribs protruding from the inner surface. Near the edges of the four sides of the inner surface of the upper base plate 31, there are multiple holes 31b, ... that fit into multiple projections (32a, ...) provided on the end faces of the side plates 32.

[0019] In this embodiment, a permeable sheet 4(41) is attached to the smooth outer surface of the upper base plate 31 so as to cover the entire surface. More specifically, the rectangular permeable sheet 41 attached to the upper base plate 31 is formed so that the length of its vertical and horizontal sides is approximately the same as or larger by a predetermined length than the length and width of the upper base plate 31. That is, the permeable sheet 41 covers at least the entire surface of the upper base plate 31 and may extend outwards in all directions of the upper base plate 31. Therefore, even when the storage and infiltration section 3 is buried, it is possible to prevent soil and sediment from flowing in from the upper and bottom surfaces on which the upper base plate 31 is installed.

[0020] The permeable sheet 4(41) is used to allow rainwater to permeate into the ground (subsurface) and to prevent soil from flowing into the storage and infiltration section 3. For example, a nonwoven fabric made of polyester fibers can be used as the permeable sheet 4(41). The permeable sheet 4 allows water to pass through while preventing soil, debris, sand, etc. from entering the infiltration basin.

[0021] Similarly, the side plate 32 is formed as a grid-like plate from synthetic resin, as shown in Figures 5 and 6. The cross-section of each grid of the side plate 32 is T-shaped, with a smooth outer surface and protruding ribs on the inner surface. The upper and lower end surfaces of the side plate 32 are provided with multiple protrusions 32a, ... which fit into multiple holes 31b, ... of the upper bottom plate 31.

[0022] In this embodiment, a permeable sheet 4(42) is attached to the smooth outer surface of the side plate 32 so as to cover the entire surface. More specifically, the rectangular permeable sheet 42 attached to the side plate 32 is formed so that the length of its vertical side is approximately the same as or larger than the length of the side plate 32 by a predetermined length, and the length of its horizontal side is longer than the length of the side plate 32. In other words, the permeable sheet 42, which is integrated with the side plate 32, is longer than the width of the side plate 32 when installed, and extends by a predetermined length in the direction of at least one adjacent side plate 32. That is, the permeable sheet 42 covers at least the entire surface of the side plate 32 and may extend in all directions of the side plate 32. Therefore, even when the storage and infiltration section 3 is buried, by sealing the gap between adjacent side plates 32, 32, it is possible to prevent soil and sediment from flowing in from the sides on which the side plates 32, 32 are installed.

[0023] In this embodiment, the permeable sheets 4 (41, 42) are integrally formed with the upper base plate 31 and the side plates 32 by insert molding or welding. Specifically, during the injection molding of the upper base plate 31 and the side plates 32, the permeable sheets 4 (41, 42) are first placed inside the molds of the upper base plate 31 and the side plates 32, and then the plastic is injected and molded (insert molding). Alternatively, the permeable sheets 4 can be joined to the upper base plate 31 and the side plates 32 by melting them when a portion of them is heated to a high temperature (welding).

[0024] (Construction method) Next, the method for constructing the rainwater infiltration basin 1 in this embodiment will be described. The construction method for the rainwater infiltration basin 1 is achieved by carrying out the following steps 1) to 4). 1) A process of integrating the permeable sheets 4 (41, 42) into the upper bottom plate 31 and the side plates 32 by insert molding or welding. As mentioned above, the permeable sheets 4 (41, 42) are installed in the molds of the upper base plate 31 and side plates 32 in advance during injection molding of the upper base plate 31 and side plates 32, and then plastic is injected and molded afterwards (insert molding).

[0025] Alternatively, the permeable sheet 4 can be joined to the upper bottom plate 31 and side plates 32 by melting them when heated to a high temperature (welding). After that, the plate-shaped upper bottom plate 31 and side plates 32 are transported stacked on top of each other without being assembled.

[0026] 2) The process of excavating the ground at the installation site. In other words, the ground is excavated so that the entire rainwater infiltration basin 1 can be buried. After excavation, it is preferable to lay sand or similar material at the bottom to create a flat foundation.

[0027] 3) Steps to assemble the storage and infiltration section 3 by installing the upper bottom plate 31 and side plates 32 which are integrated with the permeable sheets 4 (41, 42). Specifically, the upper bottom plate 31, which will be the bottom surface, is positioned and installed, and then the protrusions 32a,

[0028] 4) Step of installing the connection part 2 on top of the storage and infiltration part 3. Specifically, a cross-shaped cut is made in the permeable sheet 4(41) in the center of the upper bottom plate 31 on the top surface, corresponding to the size of the circular hole 31a (shown by the dashed line in Figure 7). Then, the connecting part 2 is fitted into the circular hole 31a to install it. Furthermore, rainwater pipes (not shown) are connected to the horizontal pipe sections 22, 22 of the connecting part 2.

[0029] 5) Backfilling process Afterward, the entire rainwater infiltration basin 1 is backfilled. When backfilling, be sure to fold the extended portion of the permeable sheet 42 for the side plate so that it fills the gap between it and the adjacent side plate 32.

[0030] (effect) Next, the effects of the rainwater infiltration basin 1 in this embodiment will be listed and explained.

[0031] (1) As described above, the rainwater infiltration basin 1 of this embodiment is equipped with a connection part 2 to which a rainwater pipe is connected, and a storage and infiltration part 3 installed below the connection part 2 to temporarily store rainwater and allow it to infiltrate into the ground. The storage and infiltration part 3 is composed of an upper bottom plate 31 integrated with a permeable sheet 41, and a plurality of side plates 32, etc., each integrated with a permeable sheet 42, etc. With this configuration, the storage and infiltration part 3 can be completed by assembling the upper bottom plate 31 and the side plates 32, thus eliminating the need to install the permeable sheet 4 (41, 42), resulting in a rainwater infiltration basin 1. Furthermore, since only two parts, the upper bottom plate 31 and the side plates 32 integrated with the permeable sheet 4 (41, 42), need to be assembled, there is no risk of assembling the parts incorrectly, and assembly can be done more quickly.

[0032] In addition, rainwater infiltration basins generally have the following functions: 1) Groundwater infiltration: Allows rainwater that falls on the surface to seep directly into the ground, replenishing groundwater. 2) Flood and inundation countermeasures: Temporarily stores rainwater, reducing the burden on drainage channels and sewers, thereby mitigating flood damage in urban areas.

[0033] (2) Furthermore, since the permeable sheet 4 is pre-integrated with the top bottom plate 31 and the side plates 32 by insert molding or welding before being delivered to the site, on-site integration work is unnecessary, enabling faster assembly.

[0034] (3) Furthermore, the permeable sheet 4(42) integrated with the side plate 32 is longer than the width of the side plate 32 when installed, and extends by a predetermined length in the direction of at least one adjacent side plate 32, so that it can cover the gap between adjacent side plates 32 and prevent soil from flowing into the storage and infiltration section 3.

[0035] (4) The method for constructing the rainwater infiltration basin of this embodiment is any of the methods for constructing the rainwater infiltration basin 1 described above, and comprises the steps of: integrating the permeable sheet 4 with the upper bottom plate 31 and the side plate 32 by insert molding or welding; excavating the ground at the installation site; assembling the storage and infiltration section 3 by installing the upper bottom plate 31 and the side plate 32 integrated with the permeable sheet 4; and installing the connecting section 2 on top of the storage and infiltration section 3. With such a configuration, the storage and infiltration section 3 can be completed by assembling the upper bottom plate 31 and the side plate 32, thus eliminating the need to install the permeable sheet 4, resulting in a rainwater infiltration basin 1. Furthermore, since only two parts, the upper bottom plate 31 and the side plate 32 integrated with the permeable sheet 4, need to be assembled, there is no chance of assembly errors, and assembly can be done more quickly. [Examples]

[0036] Next, using Figure 8, we will describe the rainwater infiltration trench 1A, which differs in form from the rainwater infiltration basin 1 of Example 1. Parts that are the same as or equivalent to those described in Example 1 will be denoted by the same reference numerals. Note that in Figure 8, the permeable sheet (4) is omitted for the sake of clarity in the structural explanation.

[0037] (composition) First, the configuration of the rainwater infiltration trench 1A will be described. The rainwater infiltration trench 1A in this embodiment does not have a connection part 2 like the rainwater infiltration basin 1, and is mainly composed only of a storage and infiltration section 3. The storage and infiltration section 3 consists of a plurality of end plates 33, ... to which rainwater pipes are connected, and comprises an end plate 33, ... integrated with a permeable sheet (not shown), a plurality of upper bottom plates 31, ... integrated with a permeable sheet (not shown), and a plurality of side plates 32, ... integrated with a permeable sheet (not shown).

[0038] More specifically, the rainwater infiltration trench 1A is constructed by connecting multiple individual units (which have a configuration similar to the rainwater infiltration basin 1 in Example 1, consisting of two upper bottom plates 31, two side plates 32, and two end plates 33). For example, in Figure 8, three individual units (two upper bottom plates 31, two side plates 32, and two end plates 33) are connected in a row.

[0039] The top bottom plate 31 has a substantially similar configuration to the top bottom plate 31 of Embodiment 1 described using Figures 3 and 4, but differs in that it does not have a circular hole (31a). The side plate 32 has a substantially similar configuration to the side plate 32 of Embodiment 1 described using Figures 5 and 6. The end plate 33 has a substantially similar configuration to the side plate 32 described in Embodiment 1, but differs in that it has a circular hole 33a in the center.

[0040] Then, a short cylindrical connecting member 34 is fitted so as to span between the circular holes 33a, 33a of adjacent units, thereby connecting the units. A split pipe 35 is connected to the short cylindrical connecting member 34 so as to straddle the units in the longitudinal direction of the rainwater infiltration trench 1A. Note that the member connected in the longitudinal direction of the rainwater infiltration trench 1A is not limited to a split pipe 35, and a perforated pipe can also be used.

[0041] (Effects / Actions) Next, the effects of the rainwater infiltration trench 1A in this embodiment will be listed and explained.

[0042] (1) As described above, the rainwater infiltration trench 1A is equipped with a storage and infiltration section 3 that temporarily stores rainwater and allows it to infiltrate into the ground. The storage and infiltration section 3 is an end plate 33 to which a rainwater pipe is connected, and consists of an end plate 33 integrated with a permeable sheet, an upper bottom plate 31 integrated with a permeable sheet, and a side plate 32 integrated with a permeable sheet. With this configuration, the storage and infiltration section 3 can be completed by assembling the upper bottom plate 31, the side plate 32, and the end plate 33, thus eliminating the need to install a permeable sheet (not shown), resulting in a rainwater infiltration trench 1A. Furthermore, only three parts—the upper bottom plate 31 integrated with the permeable sheet (not shown), the side plate 32, and the end plate 33—need to be assembled, eliminating the risk of incorrect assembly and allowing for faster assembly.

[0043] (2) Furthermore, since the permeable sheet is pre-integrated with the end plate 33, the upper bottom plate 31, and the side plate 32 by insert molding or welding before being delivered to the site, on-site integration work is unnecessary, enabling faster assembly.

[0044] (3) The rainwater infiltration trench construction method of this embodiment is the rainwater infiltration trench 1A construction method of any of the above-described methods, and comprises the steps of: integrating a permeable sheet with the end plate 33, upper bottom plate 31, and side plate 32 by insert molding or welding; excavating the ground at the installation site; and assembling the storage and infiltration section 3 by installing the end plate 33, upper bottom plate 31, and side plate 32 which are integrated with the permeable sheet. With such a configuration, the storage and infiltration section 3 can be completed by assembling the upper bottom plate 31, side plate 32, and end plate 33, thus eliminating the need to install the permeable sheet, resulting in a rainwater infiltration trench 1A. Furthermore, only the three parts of the upper bottom plate 31, side plate 32, and end plate 33 which are integrated with the permeable sheet 4 need to be assembled, eliminating the possibility of assembly errors and allowing for faster assembly.

[0045] The other components and effects are substantially the same as in Example 1, so their explanation will be omitted.

[0046] Although embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and any design modifications that do not depart from the spirit of the present invention are included in the present invention. [Explanation of symbols]

[0047] 1. Rainwater infiltration basin 1A Rainwater Infiltration Trench 2 Connection part 21 Vertical pipe section 22 Horizontal pipe section 23 Basketball Club 3. Storage and Infiltration Section 31 Upper bottom plate 31a circular hole 31b hole 32 Side panels 32a protrusion 33 Wife board 33a circular hole 34 Connecting material 35 Half-split pipe 4. Permeable sheet 41. Permeable sheet (for upper base plate) 42. Permeable sheet (for side panels)

Claims

1. It comprises a connection section to which a rainwater pipe is connected, and a storage and infiltration section installed below the connection section to temporarily store rainwater and allow it to permeate into the ground, The aforementioned storage and infiltration section is a rainwater infiltration basin composed of an upper bottom plate integrated with a permeable sheet and a plurality of side plates integrated with the permeable sheet.

2. The rainwater infiltration basin according to claim 1, wherein the permeable sheet is integrally formed with the upper bottom plate and the side plate by insert molding or welding.

3. The rainwater infiltration basin according to claim 2, wherein the permeable sheet integrated with the side plate is longer than the width of the side plate when installed, and extends by a predetermined length in the direction of at least one adjacent side plate.

4. It is equipped with a storage and infiltration section that temporarily stores rainwater and allows it to seep into the ground. The aforementioned storage and infiltration section is A gable plate to which a rainwater pipe is connected, which is an integrated gable plate with a permeable sheet, The upper bottom plate is integrated with the water-permeable sheet, Side panels integrated with a water-permeable sheet, A rainwater infiltration trench composed of the following.

5. The rainwater infiltration trench according to claim 4, wherein the permeable sheet is integrally formed with the end plate, the upper bottom plate, and the side plate by insert molding or welding.

6. A method for constructing a rainwater infiltration basin according to any one of claims 1 to 3, The process of integrating a water-permeable sheet with the upper bottom plate and the side plate by insert molding or welding, The process involves excavating the ground at the installation site, The process of assembling the storage and infiltration section by installing the upper bottom plate and the side plate which are integrated with the permeable sheet, A method for constructing a rainwater infiltration basin, comprising the step of installing the connecting part on top of the storage and infiltration part.

7. A method for constructing a rainwater infiltration trench according to claim 4 or claim 5, A step of integrating a water-permeable sheet with the end plate, the upper bottom plate, and the side plate by insert molding or welding, The process involves excavating the ground at the installation site, A method for constructing a rainwater infiltration trench, comprising the steps of assembling the storage and infiltration section by installing the end plate, the upper bottom plate, and the side plate, which are integrated with the permeable sheet.

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