JP2024063314A - Boundary blocks and planting system - Google Patents

Abstract

[Problem] To enable the treatment of rainwater on a road partitioned by a planting area and a boundary block. [Solution] A boundary block 13 is installed on the boundary between a road 12 and a planting area 11 that is located at a lower level than the road 12 and has a rainwater infiltration function, and has a drainage channel 23 that runs underground in the longitudinal direction of the road 12, a water guide outlet 25 that connects the road 12 and the planting area 11 and allows rainwater to flow from the road 12 to the planting area 11, and a drainage outlet 27 that connects the planting area 11 to the drainage channel 23 and allows rainwater from the planting area 11 to flow into the drainage channel 23. [Selected drawing] Figure 2

Description

The present invention relates to a planting system that is installed adjacent to a road, and a boundary block that can be applied to the planting system.

In recent years, natural disasters caused by heavy rainfall from typhoons and sudden downpours have been increasing, making it important to improve the capacity to treat rainwater that occurs suddenly. One of the measures being taken is to create planted areas called rain gardens on the side of roads, etc., so that rainwater from the roads can flow into the planted areas, be temporarily stored there, and then be allowed to infiltrate into the ground, thereby reducing the load on sewerage facilities and preventing flooding of roads.

For example, Patent Document 1 discloses a road structure in which a curbstone is provided at the boundary between the roadway and the sidewalk, and a greening area (planting area) is provided between the curbstone and the sidewalk. This technology allows plants to grow in the greening area, and in rainy weather, etc., allows rainwater from the sidewalk to flow into the greening area and permeate into the ground, preventing water from seeping into the sidewalk.

JP 2012-23975 A

With the technology in Patent Document 1, if a large amount of rainwater flows into the green area due to heavy rain, etc., there is a risk that the rainwater will overflow and flow back onto the sidewalk. In addition, with the technology in Patent Document 1, rainwater on the roadway side, which is separated by a curb, cannot be made to flow over the curb into the green area, so it cannot be used to treat rainwater on the roadway.

The purpose of this disclosure is to enable the treatment of stormwater in roads that are divided by planting areas and boundary blocks.

(1) The present invention provides a boundary block that is installed at the boundary between a road and a planting area that is located lower than the road and has a rainwater infiltration function,
A drainage channel extending underground in a longitudinal direction of the road;
A water guide outlet that connects the road and the planting area and allows rainwater to flow from the road to the planting area;
The planting area has a drainage outlet that communicates with the drainage channel and allows rainwater from the planting area to flow into the drainage channel.

A boundary block having the above-mentioned configuration can allow rainwater on the road to flow into the planting area through the water guide outlet, where it can be temporarily stored and infiltrated into the ground. This can prevent flooding of the road and reduce the burden on the sewerage system. Rainwater that cannot be stored or infiltrated in the planting area due to heavy rainfall or the like and overflows from the planting area can be discharged from the drainage channel through the drain outlet, preventing the rainwater from returning to the road side and preventing flooding of the road.

(2) The boundary block of (1) above preferably includes a drainage block in which the drainage channel and the drainage outlet are formed,
and a curbstone block disposed above the drainage block and having the water guide port formed therein.

According to the above configuration, the drainage channel, drain outlet, and water guide outlet are each formed as two separate blocks, simplifying the structure of the drainage block and the curb block.

(3) In the boundary block of (1) or (2) above, the water inlet and the drainage outlet are preferably positioned offset from each other in the longitudinal direction of the road.

This configuration prevents rainwater that flows into the planting area from the road through the water inlet from being discharged directly into the drainage channel through the drain outlet.

(4) In the boundary block described in any one of (1) to (3) above, preferably, the underside of the water outlet is inclined so that the side facing the road is higher and the side facing the planting area is lower.

This configuration allows rainwater from the road side to flow smoothly into the planting area, while preventing rainwater from the planting area from flowing back toward the road side.

(5) The boundary block described in any one of (1) to (4) above preferably further includes a filter member provided at the drain outlet to prevent foreign matter from entering the drain outlet.

This configuration helps prevent fallen leaves, nuts, etc. in the planting area from clogging the drain.

(6) The boundary block described in any one of (1) to (5) above preferably further has a second drainage outlet that connects the road to a drainage channel and discharges rainwater from the road into the drainage channel.

This configuration allows rainwater from the road side to flow not only into the planting area but also into the drainage channel. In the event of heavy rain or other events where there is a high possibility that rainwater in the planting area will overflow, rainwater from the road side can be quickly directed into the drainage channel.

(7) The planting system of the present disclosure includes a planting area having a rainwater infiltration function and in which plants are planted,
and the above-mentioned boundary block, which is placed at the boundary between the planting area and the road.

The planting system having the above configuration can direct rainwater from the road into the planting area through the water outlet of the boundary block, where it can be temporarily stored and allowed to infiltrate into the ground. This can prevent flooding of the road and reduce the burden on the sewerage system. Rainwater that cannot be stored or infiltrated in the planting area due to heavy rainfall or the like and overflows from the planting area can be drained from the drainage channel through the drain outlet, preventing the rainwater from returning to the road side and preventing flooding of the road.

The present invention makes it possible to treat stormwater in roads that are separated from planting areas by boundary blocks.

FIG. 1 is a plan view of a planting system according to a first embodiment. FIG. 2 is a cross-sectional view of a planting system. This is an oblique view of the boundary block seen from the road side. This is an oblique view of the boundary block as seen from the planting area side. 2 is a cross-sectional view taken along line AA in FIG. 1. 2 is a cross-sectional view taken along line BB in FIG. 1. FIG. 11 is an explanatory diagram showing the flow of rainwater when the amount of rain is small. FIG. 1 is an explanatory diagram showing the flow of rainwater when there is a large amount of rain. 13 is an explanatory diagram showing the flow of rainwater when the amount of rain is small in the planting system according to the second embodiment. FIG. 13 is an explanatory diagram showing the flow of rainwater when there is a large amount of rain in the planting system according to the second embodiment. FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[First embodiment]
Fig. 1 is a plan view of the planting system according to the first embodiment. Fig. 2 is a cross-sectional view of the planting system. Fig. 3 is a perspective view of the boundary block as viewed from the road side. Fig. 4 is a perspective view of the boundary block as viewed from the planting area side.
The planting system 10 of this embodiment includes a planting area 11 installed at an end of a roadway (road) 12 in the transverse direction Y, and a boundary block 13 installed at the boundary between the planting area 11 and the roadway 12. In the drawings, the longitudinal direction (extension direction) of the roadway 12 is indicated by arrow X, the transverse direction of the roadway 12 is indicated by arrow Y, and the up-down direction is indicated by arrow Z.

The planting area 11 is surrounded by partition materials 14 made of stone, brick, concrete blocks, etc., and boundary blocks 13. The partition materials 14 separate the planting area 11 from the walkway 15. Plants such as trees and flowers are planted in the planting area 11. The planting area 11 is configured in one layer or multiple layers in the vertical direction Z. For example, as shown in FIG. 2, the planting area 11 can include a vegetation layer 11A and a permeation layer 11B. The vegetation layer 11A is configured by a layer containing black soil, leaf mold, culture soil, etc., which are suitable for growing plants. The permeation layer 11B is a layer suitable for permeating rainwater, and is configured by a porous layer filled with crushed stone, for example. The planting area 11 is not particularly limited as long as it can grow plants and has a rainwater permeation function, and a conventionally known configuration can be adopted.

The boundary block 13 is placed at the boundary between the roadway 12 and the planting area 11. The boundary block 13 includes a drainage block 21 that is buried in whole or in part in the ground, and a curb block 22 that is placed above the drainage block 21 and protrudes above ground.

The drainage block 21 is a precast concrete member, and is formed long along the longitudinal direction X of the roadway 12, as shown in Figures 1, 3, and 4. The drainage block 21 is formed by arranging a plurality of block units 21A in the longitudinal direction X of the roadway 12. Inside the drainage block 21, a drainage channel 23 is formed that penetrates the longitudinal direction X of the roadway 12. The cross section of the drainage channel 23 along the transverse direction Y of the roadway 12 is formed in a circular shape.

The curb block 22 is a precast concrete member formed long along the longitudinal direction X of the roadway 12. The curb block 22 is formed by arranging a number of block units 22A in the longitudinal direction X of the roadway 12. The curb block 22 is disposed above the drainage block 21.

As shown in FIG. 1, another boundary block 16 is provided at the boundary between the roadway 12 and the sidewalk 15. This boundary block 16 is installed continuously with the boundary block 13 of the present invention in the longitudinal direction X of the roadway 12, and has a drainage channel 17 that communicates with the drainage channel 23 of the boundary block 13 of the present invention. This drainage channel 17 is connected to a catchment basin (not shown) or the like that is connected to a sewerage system. The boundary block 16 is formed with a drain outlet 18 that allows rainwater on the roadway 12 side to flow into the drainage channel 17.

Fig. 5 is a cross-sectional view taken along line AA in Fig. 1. Fig. 6 is a cross-sectional view taken along line BB in Fig. 1.
A convex portion 21b that protrudes upward is formed on the upper surface of the drainage block 21. The convex portion 21b is disposed at the end on the planting area 11 side in the transverse direction Y of the roadway 12. The upper surface of the drainage block 21 on the roadway 12 side of the convex portion 21b serves as the installation surface 21a of the curb block 22. A side wall surface 21b2 on the installation surface 21a side of the convex portion 21b faces the curb block 22. The convex portion 21b positions the curb block 22 relative to the drainage block 21 by means of this side wall surface 21b2.

The upper surface 11a of the planting area 11 is located at a lower position than the upper surface 12a of the roadway 12. The upper surface 11a of the planting area 11 is located at a lower position than the upper surface 21b1 of the convex portion 21b of the drainage block 21.

The curbstone block 22 is installed on the installation surface 21a of the drainage block 21. An installation adjustment material 20 such as mortar is applied between the curbstone block 22 and the installation surface 21a. The curbstone block 22 is formed with a water inlet 25 that connects the roadway 12 side and the planting area 11 side. As shown in Figures 1, 3, and 4, the water inlet 25 is formed at multiple locations spaced apart in the longitudinal direction of the curbstone block 22. The water inlet 25 is formed in one of the multiple block units 22A. The cross section of the water inlet 25 in the longitudinal direction X of the roadway 12 is rectangular. Specifically, the length of the water inlet 25 in the longitudinal direction X of the roadway 12 is greater than the length in the up-down direction Z.

As shown in FIG. 5, the upper surface 25a of the water guide outlet 25 is formed substantially horizontally. The height of the upper surface 25a of the water guide outlet 25 is higher than the height of the upper surface 12a of the roadway 12. The lower surface 25b of the water guide outlet 25 is inclined so that the roadway 12 side is higher and the planting area 11 side is lower. The end of the lower surface 25b of the water guide outlet 25 on the roadway 12 side is substantially the same height as the upper surface 12a of the roadway 12, and the end on the planting area 11 side is substantially the same height as the upper surface 21b1 of the convex portion 21b.

The water guide port 25 is formed in the shape of a hole by forming a downwardly opening recess in advance on the underside of the curb block 22, and then, after the curb block 22 is installed on the drainage block 21, filling the space between the upper surface 12a of the roadway 12 and the upper surface 21b1 of the protruding portion 21b with a filling material 26 such as concrete.

As shown in Figures 1 and 4, the drain block 21 has a plurality of drain outlets 27 formed therein. The plurality of drain outlets 27 are spaced apart in the longitudinal direction X of the roadway 12. The number of drain outlets 27 is greater than the number of water guide openings 25. The spacing between the plurality of drain outlets 27 in the longitudinal direction X of the roadway 12 is narrower than the spacing between the plurality of water guide openings 25.

As shown in FIG. 6, the drainage outlet 27 is formed in a straight line in the vertical direction Z between the upper surface of the drainage block 21 and the drainage channel 23. The drainage outlet 27 is a water channel with a rectangular cross section. In the transverse direction Y of the roadway 12, the drainage outlet 27 is formed at a position offset toward the planting area 11 from the center of the drainage channel 23.

The upper end of the drain outlet 27 opens across the upper surface 21b1 of the convex portion 21b and the installation surface 21a. The upper end of the drain outlet 27 that opens on the upper surface 21b1 of the convex portion 21b is located at a higher position than the upper surface 11a of the planting area 11. The upper end of the drain outlet 27 that opens on the installation surface 21a is closed by the curb block 22 on the installation surface 21a. The lower end of the drain outlet 27 communicates with the drainage channel 23. Therefore, rainwater that passes through the drain outlet 27 flows into the drainage channel 23.

A filter member 29 is provided at the top of the drain outlet 27 to prevent foreign matter from entering. This filter member 29 is made of wire mesh or a member with multiple slits that allow rainwater to pass through. Dead leaves, nuts, etc. may fall in the planting area 11, and if these enter and clog the drain outlet 27, smooth drainage will be hindered. In this embodiment, the filter member 29 is provided at the drain outlet 27, so clogging of the drain outlet 27 can be prevented and the drainage function can be maintained. The filter member 29 may be fixed to the top of the drain outlet 27, or may be attached in a removable manner.

As shown in FIG. 4, the drain outlets 27 and the water inlets 25 are formed at different intervals in the longitudinal direction X of the roadway 12, so the drain outlets 27 and the water inlets 25 may be arranged in overlapping positions. In this case, as shown in FIG. 5, the drain outlets 27 are filled with a filler material 28 such as mortar to prevent rainwater from flowing directly from the water inlets 25 into the drain outlets 27.

FIG. 7 is an explanatory diagram showing the flow of rainwater when the amount of rain is small.
As shown in Figure 7 (a), when it rains, rainwater w accumulated on the roadway 12 flows toward the end in the transverse direction Y due to the inclination of the roadway 12 itself, and reaches the boundary block 13. The rainwater w that reaches the boundary block 13 passes through the water guide outlet 25 and flows into the planting area 11. Because the upper surface 11a of the planting area 11 is lower than the upper surface 12a of the roadway 12, the rainwater w on the roadway 12 flows in one direction toward the planting area 11. In addition, because the lower surface 25b of the water guide outlet 25 is inclined so as to become lower from the roadway 12 side toward the planting area 11 side, the rainwater w on the roadway 12 flows smoothly into the planting area 11.

As shown in FIG. 7B, the rainwater w that flows into the planting area 11 is temporarily stored in the planting area 11 and infiltrates into the ground. When the amount of rain is small, the amount of rainwater w that flows into the planting area 11 is also small, and the rainwater w can be sufficiently stored and infiltrated in the planting area 11. If the height of the rainwater w in the planting area 11 does not reach the upper end of the drainage outlet 27 (the upper surface 21b1 of the convex portion 21b), the rainwater w will not flow into the drainage outlet 27 or be discharged into the sewerage system via the drainage channel 23. Therefore, the amount of rainwater w flowing into the sewerage system can be reduced, and the load on the sewerage system can be reduced. In addition, by actively allowing the rainwater w to flow into the planting area 11, the growth of plants can be promoted.

FIG. 8 is an explanatory diagram showing the flow of rainwater when there is a large amount of rain.
As shown in Fig. 8(a), when heavy rain falls due to a typhoon or the like, a large amount of rainwater w accumulates on the roadway 12, and a large amount of rainwater w flows into the planting area 11 through the water guide outlet 25. In addition, a large amount of rainwater w falls on the planting area 11 itself, so the amount of rainwater w in the planting area 11 becomes large.

As shown in FIG. 8(b), when the rainwater w cannot be stored or infiltrated in the planting area 11 and the height of the rainwater w in the planting area 11 reaches the top end of the drain outlet 27 (rainwater w overflows from the planting area 11), the rainwater w passes through the drain outlet 27 and flows into the drainage channel 23. This allows the excess rainwater w that cannot be stored or infiltrated in the planting area 11 to be discharged to the sewerage system.

In the planting system 10 of this embodiment, when there is a large amount of rain and the rainwater cannot be stored or infiltrated in the planting area 11, the rainwater can be discharged from the drain outlet 27 formed in the boundary block 13 to the drainage channel 23 connected to the sewerage system. Therefore, there is no need to provide a catchment basin for collecting rainwater within the planting area 11.

Providing a catchment area within the planting area 11 has the disadvantage that the top surface of the catchment area is exposed to the planting area 11, deteriorating the appearance, and the catchment area encroaches on the area where rainwater is stored and infiltrated and the area where plants are planted. Also, in order to discharge the rainwater collected in the catchment area into the sewerage system, it is necessary to provide the catchment area with a drainage pipe connected to the sewerage system. This means that the construction area must be expanded outside the planting area 11. Furthermore, such extensive construction work requires administrative procedures to be completed by various management agencies for roads, sewerage systems, etc., increasing the overall construction costs.

In this embodiment, it is only necessary to connect the drainage channel 23 of the boundary block 13 located at the boundary between the planting area 11 and the roadway 12 to drainage equipment already installed on the road (such as the drainage channel 17 of the boundary block 16 in FIG. 1), which reduces extensive construction work and complicated administrative procedures and cuts costs. In addition, it is possible to maximize the area in the planting area 11 for storing and infiltrating rainwater and for planting plants.

In addition, when the planting area 11 is located along a roadway 12 with a small gradient, providing a catchment basin causes rainwater to collect in the catchment basin, making it difficult for the rainwater to reach the entire planting area 11, which has the disadvantage of making it easier for the rainwater to infiltrate unevenly. In this embodiment, the boundary block 13 is provided with multiple drainage outlets 27 spaced apart in the longitudinal direction X of the roadway 12, so that rainwater can be discharged from each drainage outlet 27 regardless of whether the roadway 12 has a gradient, allowing the rainwater to infiltrate uniformly throughout the planting area 11.

Second Embodiment
Fig. 9 is an explanatory diagram showing the flow of rainwater when the amount of rain is small in the planting system according to the second embodiment. Fig. 10 is an explanatory diagram showing the flow of rainwater when the amount of rain is large in the planting system according to the second embodiment.
As in the first embodiment, the boundary block 13 of the present embodiment includes a drainage block 31 and a curb block 22. The curb block 22 has substantially the same configuration as in the first embodiment.

The upper surface of the drainage block 31 of this embodiment has a convex portion 31b and an installation surface 31a, similar to the drainage block 21 of the first embodiment. However, the drainage block 31 is installed so that the convex portion 31b is located on the roadway 12 side and the installation surface 31a is located on the planting area 11 side.

The drainage block 31 has a drainage channel 33, a first drain outlet 37, and a second drain outlet 38. The first drain outlet 37, like the drain outlet 27 of the first embodiment, connects the planting area 11 to the drainage channel 33. The second drain outlet 38 connects the roadway 12 to the drainage channel 33. The upper end of the first drain outlet 37 opens at the installation surface 21a of the drainage block 21, and the lower end connects to the drainage channel 33. The first drain outlet 37 is inclined diagonally upward from the drainage channel 33 toward the planting area 11.

The second drainage outlet 38 has a different function from the drainage outlet 27 of the first embodiment that drains rainwater in the planting area 11 to the drainage channel 33, but is formed in substantially the same shape as the drainage outlet 27. In addition, the relationship between the second drainage outlet 38 and the convex portion 31b and the installation surface 31a is the same as the relationship between the drainage outlet 27 and the convex portion 21b and the installation surface 21a in the first embodiment. Therefore, the drainage block 21 in the first embodiment and the drainage block 31 in the second embodiment have the same structure except for the presence or absence of the first drainage outlet 37. Therefore, it is possible to standardize the manufacturing process (such as standardizing the formwork used). In addition, by blocking the first drainage outlet 37 of the drainage block 31 of the second embodiment with mortar, metal fittings, etc., the drainage block 31 can also be used as the drainage block of the first embodiment.

As shown in FIG. 9(a), when it rains, rainwater w that has accumulated on the roadway 12 flows toward the end in the transverse direction Y due to the inclination of the roadway 12 itself, and reaches the boundary block 13. The rainwater w that reaches the boundary block 13 passes through the water guide 25 and flows into the planting area 11. Because the upper surface 11a of the planting area 11 is lower than the upper surface 12a of the roadway 12, the rainwater w on the roadway 12 flows in one direction toward the planting area 11. In addition, because the lower surface 25b of the water guide 25 is inclined so as to gradually become lower from the roadway 12 side toward the planting area 11 side, the rainwater w on the roadway 12 flows smoothly into the planting area 11.

Furthermore, as shown in FIG. 9(b), the rainwater w that reaches the boundary block 13 also flows into the drainage channel 33 via the second drain outlet 38. The rainwater w flowing through the drainage channel 33 is discharged into the sewerage system.

Rainwater w that flows into the planting area 11 is temporarily stored in the planting area 11 and infiltrates into the ground. When the amount of rainfall is small, the amount of rainwater w that flows into the planting area 11 is also small, and the rainwater w can be sufficiently stored and infiltrated in the planting area 11. If the height of the rainwater w in the planting area 11 does not reach the upper end of the first drain outlet 37, the rainwater w will not flow into the first drain outlet 37, nor will it flow into the sewerage system via the drainage channel 33. Therefore, the amount of rainwater w flowing into the sewerage system can be reduced, and the load on the sewerage system can be reduced. In addition, by allowing the rainwater w to flow into the planting area 11, the growth of plants can be promoted.

As shown in FIG. 10(a), when heavy rain falls due to a typhoon or the like, a large amount of rainwater w accumulates on the roadway 12, and a large amount of rainwater w also flows into the planting area 11 through the water guide outlet 25. In addition, a large amount of rainwater w falls on the planting area 11 itself, so the amount of rainwater w in the planting area 11 becomes large.

Furthermore, as shown in FIG. 10(b), the rainwater w that reaches the boundary block 13 flows into the drainage channel 33 through the second drain outlet 38. The rainwater w flowing through the drainage channel 33 is discharged into the sewerage system.

When the rainwater w cannot be stored or infiltrated in the planting area 11 and the level of the rainwater w in the planting area 11 reaches the top end of the first drain outlet 37 (rainwater w overflows from the planting area 11), the rainwater w passes through the first drain outlet 37 and flows into the drainage channel 33. This allows the excess rainwater w that cannot be stored or infiltrated in the planting area 11 to be discharged to the sewerage system.

[Other embodiments]
The planting system 10 in the above embodiment comprises a planting area 11 arranged adjacent to the roadway 12 and a boundary block 13 installed between the roadway 12 and the planting area 11. However, for example, the planting system may also comprise a planting area 11 adjacent to a road other than the roadway 12 (such as a sidewalk 15) and a boundary block 13 installed between the road and the planting area 11.

In the above embodiment, it has been described that there is no need to provide a catchment basin in the planting area 11 of the planting system 10. However, the planting system 10 of the present invention does not prevent a catchment basin from being installed in the planting area 11. In this case, it is also possible to configure the planting area 11 to discharge rainwater from the catchment basin in addition to the drain outlet 27.

The boundary block 13 in the above embodiment has separate drainage blocks 21, 31 and a curb block 22. However, the boundary block 13 of the present invention may be composed of a single block having drainage channels 23, 33, drainage outlets 27, 37, and a water guide port 25.

[Effects of the embodiment]
The boundary block 13 of the above embodiment is installed at the boundary between the road (carriageway) 12 and the planting area 11 that is located at a lower level than the road 12 and has a rainwater infiltration function. The boundary block 13 has drainage channels 23, 33 extending underground in the longitudinal direction X of the road 12, a water guide outlet 25 that connects the road 12 and the planting area 11 and allows rainwater to flow from the road 12 to the planting area 11, and drainage outlets 27, 37 that connect the planting area 11 and the drainage channels 23, 33 and allow rainwater from the planting area 11 to flow into the drainage channels 23, 33. Therefore, rainwater on the road 12 can flow into the planting area 11 through the water guide outlet 25, and the rainwater can be temporarily stored in the planting area 11 and infiltrated into the ground. Rainwater (overflow water) that overflows from the planting area 11 due to heavy rain or the like and cannot be stored or infiltrated in the planting area 11 can be directed into the drainage channels 23, 33 via the drain outlets 27, 37, thereby preventing the rainwater from flowing back toward the road 12.

The boundary block 13 in the above embodiment has drainage blocks 21, 31 in which drainage channels 23, 33 and drainage outlets 27, 37 are formed, and a curb block 22 arranged above the drainage blocks 21, 31 and in which a water guide port 25 is formed. In this way, by forming the drainage channels 23, 33, the drainage outlets 27, 37, and the water guide port 25 separately in the two blocks 21, 31, 22, respectively, it is possible to simplify the structure of each of the drainage blocks 21, 31 and the curb block 22. In other words, only the drainage channels 23, 33 and the drainage outlets 27, 37 need to be formed in the drainage blocks 21, 31, and only the water guide port 25 needs to be formed in the curb block 22.

In particular, in this embodiment, the drainage ports 27, 37 are formed in all the block units 21A constituting the drainage blocks 21, 31, but the water guide ports 25 are not formed in all the block units 22A constituting the curb block 22, and the water guide ports 25 are formed only in some of the block units 22A. Therefore, if the block units 21A of the drainage block 21 and the block units 22A of the curb block 22 are integrally formed, not only will the structure of the integrated block units become complex, but two types of block units with complex structures, one with a water guide port 25 and one without, will be required. In the case of the above embodiment, the block units 22A of the curb block 22 without the water guide port 25 do not need to have holes or recesses that form the water guide port 25, so the structure is extremely simple and manufacturing is easy. Therefore, even if two types of block units 22A are required as the curb block 22, the increase in manufacturing costs can be suppressed.

In the boundary block 13 of the above embodiment, the water inlet 25 and the drainage outlets 27, 37 are positioned at positions offset from each other in the longitudinal direction X of the road 12. This makes it possible to prevent rainwater that flows from the road 12 into the planting area 11 through the water inlet 25 from being directly discharged from the drainage outlets 27, 37 into the drainage channels 23, 33.

In the above embodiment, when the water inlet 25 and the drainage outlets 27, 37 are arranged in a position where they overlap, the drainage outlets 27, 37 are blocked with a filler 28 such as mortar. This eliminates the need to adjust the positions of the water inlet 25 and the drainage outlets 27, 37 when installing the drainage blocks 21, 31 and the curbstone blocks 22, improving workability. In addition, by blocking the drainage outlets 27, 37, which have a small opening area and are more numerous, rather than blocking the water inlet 25, which have a large opening area and are fewer in number, it is possible to suppress a decrease in the drainage capacity from the drainage outlets 27, 37 without impairing the ability to flow rainwater from the road 12 side into the planting area 11.

In the boundary block 13 of the above embodiment, the underside 25b of the water guide 25 is inclined so that the road 12 side is higher and the planting area 11 side is lower. This allows rainwater on the road 12 side to flow smoothly into the planting area 11 side, and prevents rainwater on the planting area 11 side from flowing back toward the road 12 side.

The boundary block 13 in the above embodiment further includes a filter member 29 that is provided at the drainage outlets 27, 37 and prevents foreign matter from entering the drainage outlets 27, 37. There is a large amount of foreign matter, such as fallen leaves and nuts, in the planting area 11, and it is highly likely that these will enter the drainage outlets 27, 37. In the above embodiment, the filter member 29 is provided at the drainage outlets 27, 37, so that it is possible to prevent foreign matter from entering and clogging the drainage outlets 27, 37. In addition, if the filter member 29 is detachable from the drainage outlets 27, 37, cleaning of the drainage outlets 27, 37 and the filter member 29 can be easily performed.

The boundary block 13 of the second embodiment further includes a second drainage outlet 38 that connects the road 12 to the drainage channel 33 and discharges rainwater from the road 12 into the drainage channel 33. This allows rainwater on the road 12 side to flow not only into the planting area 11 but also into the drainage channel 33. In the event of heavy rain or other events where there is a high possibility of rainwater overflowing from the planting area 11, the rainwater on the road 12 side can be quickly flowed into the drainage channel 33.

The embodiments disclosed herein are illustrative and not limiting. The scope of the invention is defined by the claims, and includes all modifications within the scope of the claims.

10: Planting system 11: Planting area 12: Roadway (road)
13: Boundary block 21: Drain block 22: Curb block 23: Drainage channel 25: Water inlet 27: Drain outlet 29: Filter member 31: Drain block 37: First drain outlet 38: Second drain outlet X: Longitudinal direction

Claims (7)

A boundary block installed on the boundary between a road and a planting area that is located lower than the road and has a rainwater infiltration function,
A drainage channel extending underground in a longitudinal direction of the road;
A water guide outlet that connects the road and the planting area and allows rainwater to flow from the road to the planting area;
A boundary block having a drainage outlet that connects the planting area with the drainage channel and allows rainwater from the planting area to flow into the drainage channel. a drainage block in which the drainage channel and the drainage port are formed;
The boundary block according to claim 1 , further comprising: a curbstone block arranged above the drainage block and having the water guide opening formed therein. The boundary block according to claim 1 or 2, wherein the water inlet and the drainage outlet are positioned offset from each other in the longitudinal direction of the road. The boundary block according to claim 1 or 2, wherein the underside of the water outlet is inclined so that the road side is higher and the planting area side is lower. The boundary block according to claim 1 or 2, further comprising a filter member provided at the drain outlet to prevent foreign matter from entering the drain outlet. The boundary block according to claim 1 or 2, further comprising a second drainage outlet that connects the road to a drainage channel and discharges rainwater from the road into the drainage channel. A planting area with rainwater infiltration function where plants can be planted;
A planting system comprising: a boundary block according to claim 1 or 2, which is placed at the boundary between the planting area and a road.

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