Irrigation equipment

Abstract

To irrigate a lawn structure including artificial turf and natural turf without using tap water. [Solution] The irrigation device 100 comprises a container 1, a water absorption layer formed within the container, a turf layer 3 formed on the water absorption layer and containing artificial turf and natural turf, a tank 4 for storing water discharged from the container, a water supply channel 5 for supplying water to the turf layer, and a pump 6 for sending water from the tank to the water supply channel. The water supply channel has a water supply trough 60 arranged along one edge of the container in a plan view.

Description

[Technical Field]

[0001] The present disclosure relates to irrigation devices. [Background technology]

[0002] A turf structure combining artificial turf and natural turf is known. This turf structure can be applied to stadiums for sports such as futsal, and has the advantage of reducing the burden on players compared to regular artificial turf. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-78067 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because these lawn structures include natural grass, they must be irrigated. However, if the lawn structure covers a large area, irrigation using tap water has the disadvantage of using a large amount of tap water.

[0005] The present disclosure has been devised in light of the above circumstances, and its purpose is to provide an irrigation device that can irrigate lawn structures, including artificial turf and natural turf, without using tap water. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, A container and a water absorbing layer formed in the container; A turf layer formed on the water absorption layer and including artificial turf and natural turf; a tank for storing water discharged from the container; A water supply channel for supplying water to the lawn layer; a pump that sends water from the tank to the water supply channel; Equipped with The water supply passage has a water supply trough arranged along one edge of the container in a plan view. An irrigation device characterized by the above features is provided.

[0007] Preferably, the water supply trough is formed in a U-shaped cross section with an open top, is positioned within the container, and has a side wall adjacent to the water absorption layer, and the side wall has a plurality of water supply holes extending therethrough.

[0008] Preferably, the side wall is formed of a punched metal.

[0009] Preferably, the irrigation device includes a drain pipe arranged to drain water from the other edge of the container in a plan view.

[0010] Preferably, the irrigation device includes a drainage channel arranged along the other edge portion on the outside of the other edge portion of the container in a plan view, The drain pipe is connected to the drain channel.

[0011] Preferably, the drain pipe has a mesh pipe arranged along the other edge portion inside the container, and an elbow attached to the mesh pipe, The drainage channel is formed by a U-shaped gutter that is open at the top, The elbow penetrates the side wall of the U-shaped gutter and protrudes into the U-shaped gutter.

[0012] Preferably, the bottom of the container has a downward slope from one edge to the other edge.

[0013] Preferably, the absorbent layer comprises a lower first layer of coarse volcanic gravel and an upper second layer of fine volcanic gravel. [Effects of the Invention]

[0014] According to the present disclosure, turf structures, including artificial turf and natural turf, can be irrigated without using tap water. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a plan view showing an irrigation device according to an embodiment of the present disclosure. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] This is a schematic bottom view of the turf layer as seen from the back. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 4 is a schematic diagram showing a cross section taken along line VV in FIG. [Figure 6] FIG. 2 is a longitudinal sectional side view showing the tank and its surroundings. [Figure 7] FIG. 2 is a longitudinal sectional front view showing the water supply trough and its surroundings. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the present disclosure is not limited to the following embodiments.

[0017] Fig. 1 is a plan view showing the irrigation device according to this embodiment. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. For convenience, the front, rear, left, right, top and bottom directions are defined as shown in the figure. The top and bottom directions coincide with the top and bottom directions in the vertical direction.

[0018] The irrigation device 100 comprises a container 1, a water absorption layer 2 formed within the container 1, and a turf layer 3 formed on the water absorption layer 2 and containing artificial turf and natural turf. The irrigation device 100 also comprises a tank 4 for storing water discharged from the container 1, a water supply channel 5 for supplying water to the turf layer 3, and a pump 6 for sending water from the tank 4 to the water supply channel 5.

[0019] In other words, the irrigation device 100 constitutes a recirculation irrigation system that stores in the tank 4 the water discharged from the container 1 after irrigating the turf layer 3, and reuses this stored water to irrigate the turf layer 3. The flow of water in the irrigation device 100 is indicated by arrow F.

[0020] The container 1, also called a pool or bowl, is a waterproof container with an open top. When viewed from above, the container 1 has a rectangular shape with its front-to-back length longer than its left-to-right width. The left side of the container 1 is the water supply side where water is supplied, and the right side of the container 1 is the drainage side where water is drained.

[0021] Container 1 is formed in a dish-shaped recess 7A formed by digging into ground 7, which constitutes the ground. Container 1 comprises a foundation K that forms its bottom surface and is formed on the bottom surface of recess 7A, a frame plate 8 that is U-shaped in plan view and forms the front, rear, and left edges of container 1 and is supported upright by supports (not shown), a U-shaped gutter 10 that forms the right edge of container 1 and is attached to foundation K with mortar 9, and a waterproof sheet 11 that is laid on the surfaces of foundation K, frame plate 8, and gutter 10 within the area surrounded by frame plate 8 and gutter 10. In other words, container 1 is made watertight or waterproof by the waterproof sheet 11 laid on its front, back, left, and right inner side surfaces and bottom surface.

[0022] The configuration of the container 1 is not limited to this. For example, the container 1 may be a container formed integrally from plastic, concrete, or the like. Furthermore, although the container 1 of this embodiment is entirely watertight, it may be a container in which only a portion is water-permeable or permeable, such as a typical flowerpot.

[0023] The base K is formed by spreading recycled crusher run to a predetermined thickness on the bottom surface of the recess 7 A. The material of the base K is not limited to recycled crusher run, and may be any material.

[0024] The frame plate 8 is made of wood and is fixed to a plurality of posts (not shown) driven into the ground 7. The frame plate 8 is U-shaped in plan view and is made up of a front plate 8A that defines the front edge of the container 1, a rear plate 8B that defines the rear edge of the container 1, and a left plate 8C that defines the left edge of the container 1. The lower ends of these plates are embedded in the ground 7.

[0025] The U-shaped gutter 10 is made of concrete and is commercially available, and is formed with a U-shaped cross section with an open top as shown in Figure 2, and defines the right edge of the container 1. The left and right edges correspond to the one edge and the other edge, respectively, as defined in the claims.

[0026] The gutter 10 is disposed along and adjacent to the outside of the right edge of the container 1, and extends slightly further forward and rearward than the container 1. The gutter 10 forms a drainage channel 12 that carries water discharged from the container 1 after irrigation toward the tank 4. The drainage channel 12 within the gutter 10 is an open culvert with an open top. However, the drainage channel 12 may also be an underground culvert.

[0027] The waterproof sheet 11 is a flexible resin sheet that is impermeable to water. During construction, the waterproof sheet 11 is roughly overlapped on the surfaces of the foundation K, the frame plate 8, and the gutter 10. After that, gravel, which will be described later and forms the water absorption layer 2, is spread inside the concave waterproof sheet 11, thereby adhering the waterproof sheet 11 to the surfaces of the foundation K, the frame plate 8, and the gutter 10. This forms a container 1 that is rectangular in plan view and has a certain depth.

[0028] The bottom surface 13 of the container 1 has a slight downward slope (for example, 1%) from its left edge to its right edge. In this embodiment, the downward slope of the bottom surface 13 is formed by providing a downward slope in the base K.

[0029] The water absorption layer 2 is made of a porous material, and in this embodiment, is made of a porous granular material, specifically, volcanic gravel. The water absorption layer 2 in this embodiment is formed by spreading volcanic gravel inside the container 1.

[0030] In this embodiment, the water absorption layer 2 has a two-layer structure, including a lower first layer 2A made of coarse volcanic gravel and an upper second layer 2B made of fine volcanic gravel. As shown in Figure 7, the thickness H2B of the second layer 2B is set equal to the thickness H2A of the first layer 2A.

[0031] The structure of the water absorption layer 2 is not limited to this. For example, the water absorption layer 2 may be formed of a porous material or granular material other than volcanic gravel. In this case, it is preferable that the material has a water purification function as described below. The water absorption layer 2 may have a single-layer structure or a multi-layer structure consisting of two or more layers, and the thickness of each layer can be changed as desired.

[0032] The turf layer 3 is formed of a hybrid turf, a turf structure that combines artificial turf with natural turf. Figure 3 shows a schematic bottom view of the turf layer 3 as seen from the back (however, the roots of the natural turf are omitted). Figure 4 shows a schematic cross section taken along line IV-IV in Figure 3, and Figure 5 shows a schematic cross section taken along line VV in Figure 3.

[0033] 3 and 4, the artificial turf 41 includes a base material 42, pile 43, and a backing material 44. The base material 42 is a flexible resin sheet that is permeable or water-permeable, and in this embodiment is formed of a resin mesh sheet.

[0034] The pile 43 is a green, string-like member that resembles the leaves of natural grass and is made of a resin material. The pile 43 is folded back in a U-shape and penetrates the base material 42 at two separate locations from the back side (lower side) to the front side (upper side). For convenience, the figure shows only one pile 43 folded back and penetrating the base material 42, but in reality, multiple piles 43 are folded back in a bundle and penetrate the base material 42. A folded portion 45 of the pile 43 is in close contact with the back side of the base material 42, and a predetermined length of the pile 43 protrudes from the front side of the base material 42.

[0035] The piles 43 attached to the base material 4 in this manner are aligned at equal intervals along the warp direction a of the base material .

[0036] The backing material 44 is made of a resin material and is applied to the back side of the base material 42. The backing material 44 is formed in a strip shape extending in the warp direction a, and is adhered to and continuously covers the folded-back portions 45 of a row of pile threads 43. In this way, the backing material 44 fixes the pile threads 43 to the base material 42 and also functions as a backing that supports the pile threads 43 from below.

[0037] A plurality of combinations of a row of pile 43 and a strip-shaped backing material 44 (referred to as pile fixing parts 46) are formed at equal intervals in a weft direction b perpendicular to the warp direction a. The base material 42 is exposed between the pile fixing parts 46, and natural grass is planted here with its roots penetrating the base material 42.

[0038] As shown in Figure 5, natural turf 47 has leaves 48 and roots 49. The leaves 48 extend upward on the front side of the base material 42, and the roots 49 pass through the mesh of the base material 42 and extend downward within the water absorption layer 2, particularly the upper second layer 2B. Sand 50 is deposited on the front side of the base material 42, and the pile 4 of the artificial turf 41 and the leaves 48 of the natural turf 47 protrude above this sand 50. The leaves 48 are exposed to light such as sunlight, and the roots 49 absorb water from the water absorption layer 2, allowing the natural turf 47 to grow by photosynthesis.

[0039] The structure of the grass layer 3 described here is just one example, and grass layers 3 with various other structures can also be used.

[0040] As shown in Figure 7, the height position of the upper end of the grass layer 3 is set to be equal to the height position of the upper end of the frame plate 8 of the container 1. Furthermore, the thickness H3 of the grass layer 3 is set to be smaller than the thickness H2A of the first layer 2A and the thickness H2B of the second layer 2B.

[0041] For convenience, the combination of the container 1, absorbent layer 2 and turf layer 3 will be referred to as the turf assembly.

[0042] 1 and 6, the tank 4 is formed by a manhole buried in the ground 7. The tank 4 is provided with an entrance / exit 14 formed in its top plate 4A for people to enter and exit, a lid 15 that releasably covers the entrance / exit 14, a handrail 16 used by people to ascend and descend inside the tank 4, and an inspection hatch 17 formed as a through-hole in the top plate 4A for checking the water level inside the tank 4.

[0043] The pump 6 is a submersible pump installed at the bottom 4C of the tank 4. A pump outlet pipe 66, which forms part of the water supply passage 5, extends from the pump 6.

[0044] An overflow pipe 18 is also attached to the tank 4. The overflow pipe 18 is for releasing water from the tank 4 when the water level in the tank 4 exceeds a predetermined upper limit, and is buried in the ground 7. The outlet of the overflow pipe 18 is connected to a permeable pipe (not shown) that is buried in the ground 7. The overflow water that flows into the permeable pipe through the overflow pipe 18 is allowed to seep directly into the ground. The outlet of the overflow pipe 18 may be connected to a stormwater drainage pipe or a stormwater drainage basin.

[0045] As shown in Figures 1 and 2, the water supply channel 5 has a water supply trough 60 arranged along the left edge of the container 1. The irrigation device 100 is configured to temporarily store water discharged from the pump 6, i.e., supply water, in the water supply trough 60 and then supply it into the water absorption layer 2. As shown in Figure 1, the water supply trough 60 is arranged on the left edge of the container 1 and extends over the entire front-to-back length of the container 1. The front and rear ends of the water supply trough 60 are closed.

[0046] 7, the water supply trough 60 has a U-shaped cross section that is open at the top. The water supply trough 60 has a right side wall 61, a left side wall 62, and a bottom wall 63 that connects the lower ends of the side walls 61, 62 together.

[0047] The water supply trough 60 in this embodiment is made of stainless steel. However, the material of the water supply trough 60 can be changed as desired. For example, it may be made of a metal other than stainless steel, such as iron, or a hard material such as resin.

[0048] In this embodiment, the water supply trough 60 is formed by bending a stainless steel plate into an L-shaped cross section to form the left side wall 62 and the bottom wall 63, and welding the stainless steel plate that forms the right side wall 61 to the right edge of the bottom wall 63.

[0049] The left side wall 62 is adjacent to the waterproof sheet 11 superimposed on the left plate 8C of the frame plate 8, and the bottom wall 63 is placed on the waterproof sheet 11 superimposed on the upper surface of the foundation K. A gap may be provided between the bottom wall 63 and the waterproof sheet 11, and coarse volcanic gravel forming the first layer 2A of the water absorption layer 2 may be laid in this gap.

[0050] The right side wall 61 is adjacent to the water absorption layer 2. In particular, in this embodiment, the right side wall 61 is adjacent to the first layer 2A, the second layer 2B and the turf layer 3 of the water absorption layer 2.

[0051] The right side wall 61 has a plurality of water supply holes 64 that pass through it. In particular, the right side wall 61 in this embodiment is formed from stainless steel punched metal. The punched metal in this embodiment is made of a stainless steel plate with a plurality of circular through holes arranged in a staggered pattern. These through holes form the water supply holes 64. The shape and arrangement of the through holes are arbitrary. Water stored in the water supply trough 60 is supplied to the water absorption layer 2 and the turf layer 3 (mainly the water absorption layer 2) through the plurality of water supply holes 64. The plurality of water supply holes 64 are provided evenly throughout the entire right side wall 61.

[0052] In this embodiment, the height position of the upper end of the water supply trough 60 is set to be equal to the height position of the upper end of the turf layer 3 and the height position of the upper end of the frame plate 8 of the container 1.

[0053] 1, 6, and 7, the water supply passage 5 has a water supply pipe 65 for supplying water discharged from the pump 6, i.e., supply water, into the water supply trough 60. The water supply pipe 65 in this embodiment is formed from a PVC pipe and its piping material, although the material is optional.

[0054] The water supply pipeline 65 has the aforementioned pump outlet pipe 66 (see Figure 6) extending upward from the pump 6 inside the tank 4, and an underground pipe 67 (see Figure 1) buried in the ground 7 and extending horizontally from the tank 4 to near the container 1. The inlet end of the underground pipe 67 penetrates the tank 4 from inside the ground 7 into the tank 4, and then is connected to the outlet end of the pump outlet pipe 66 via an elbow (not shown).

[0055] The water supply pipeline 65 also has a riser pipe 68 (see Figure 1) that is connected to the outlet end of the underground pipe 67 via an elbow (not shown) and rises upward from inside the ground 7, and a distribution pipe 69 (see Figures 1 and 7) that is connected to the outlet end of the riser pipe 68 via an elbow (not shown) and extends horizontally in the front-to-back direction in the air to the left of the container 1.

[0056] The water supply pipeline 65 also has a trough pipe 70 (see Figures 1 and 7) extending in the longitudinal direction (front-to-back direction) of the water supply trough 60 near the bottom wall 63 within the water supply trough 60, and a connecting pipe 71 (see Figures 1 and 7) connecting the distribution pipe 69 and the trough pipe 70.

[0057] A plurality of trough pipes 70 are provided, and in particular, a total of two are provided at two locations, front and rear, spaced apart within the water supply trough 60. In addition, a total of two connecting pipes 71 are also provided corresponding to the trough pipes 70.

[0058] The front connecting pipe 71 and the rear connecting pipe 71 have almost the same configuration, so for convenience, the rear connecting pipe 71 will be mainly described here with reference to FIG.

[0059] The connecting pipe 71 is formed in a crank shape when viewed from the front. The connecting pipe 71 has a first connecting pipe 73 that is connected to the middle of the distribution pipe 69 via a tee 72 and extends downward, a second connecting pipe 75 that is connected to the outlet end of the first connecting pipe 73 via an elbow 74 and extends horizontally to the right on the ground 7, and a third connecting pipe 78 that is connected to the outlet end of the second connecting pipe 75 via an elbow 76, extends downward, and is connected to the longitudinal middle of the trough pipe 70 via a tee 77.

[0060] The trough pipe 70 is provided with a plurality of water supply holes 79, and water introduced into the trough pipe 70 is supplied into the trough pipe 70 through the water supply holes 79. The plurality of water supply holes 79 are provided at the bottom of the trough pipe 70 at equal intervals in the longitudinal direction. However, the arrangement of the water supply holes 79 is not limited to this. Both longitudinal ends of the trough pipe 70 are closed by caps (not shown).

[0061] The first connecting pipe 73 is provided with an on-off valve 80 for controlling the supply and flow rate of water to the trough pipe 70. In this embodiment, the on-off valve 80 is a manual valve, but the on-off valve 80 may also be an electromagnetic valve.

[0062] The front connecting pipe 71 is different only in that the first connecting pipe 73 is connected to the outlet end of the distribution pipe 69 via an elbow (not shown), and the rest of the configuration is the same. The distribution pipe 69 and the first connecting pipe 73 are supported by pillars (not shown) fixed to the ground 7.

[0063] 1 and 2, the irrigation device 100 is provided with a drain pipe 20 arranged to drain water from the right edge of the container 1. The drain pipe 20 is connected to a drain channel 12. The drain channel 12 is arranged outside the right edge of the container 1 and along that right edge.

[0064] The drain pipe 20 of this embodiment has a mesh pipe 81 arranged along the right edge inside the container 1 and an elbow 82 attached to the mesh pipe. The mesh pipe 81 is formed into a tubular shape from mesh resin and is water permeable. The mesh pipe 81 extends over almost the entire length of the container 1 from front to back.

[0065] The elbows 82 are attached to both ends of the reticulated pipe 81. The elbows 82 penetrate the left side wall 10A of the U-shaped gutter 10 and the waterproof sheet 11 covering it, and protrude into the U-shaped gutter 10, i.e., into the drainage channel 12. The penetration part of the elbow 82 is filled with mortar to fix and seal the elbow 82. The elbow 82 essentially forms the outlet of the drainage pipe 20.

[0066] It is also possible to provide a cheese in the middle of the mesh tube 81, and to form an additional outlet by using this cheese.

[0067] As shown in Figures 1 and 6, a mud pit 22 that is deeper than the gutter 10 is connected to the rear or downstream end of the gutter 10. This mud pit 22 also has a U-shaped cross section like the gutter 10, is made of concrete, and is open upward. The mud pit 22 also forms part of the drainage channel 12. The rear end of the mud pit 22 is closed by a rear end closure plate 24. The front end of the gutter 10 is closed by a front end closure plate 25.

[0068] The water stored in the mud pit 22 is sent to the tank 4 through a return pipe 26. The return pipe 26 is made of, for example, a PVC pipe, is buried in the ground 7, and extends horizontally in the front-to-rear direction. The inlet end of the return pipe 26 penetrates the rear end closure plate 24 and opens into the mud pit 22, and the outlet end of the return pipe 26 penetrates the side wall 4B of the tank 4 and opens into the tank 4.

[0069] As shown in Fig. 1, a water pipe 27 is connected to the side wall 4B of the tank 4 to supply clean water (tap water) into the tank 4 as needed. By being able to supply clean water in this way, sufficient irrigation can be performed even when the water in the tank 4 is insufficient, for example, during a drought period such as midsummer or during the initial growth period.

[0070] Next, the effects of this embodiment will be described.

[0071] First, the turf layer 3 of this embodiment is intended to be used in a variety of applications, including stadiums for various sports such as futsal, outdoor, rooftop, or indoor parks and various facilities, and turf as landscaping equipment. The turf layer 3 of this embodiment is highly effective for use in green infrastructure.

[0072] The water stored in the tank 4 is sent to the water supply trough 60 by the pump 6. The water is then supplied to the water absorption layer 2 and the turf layer 3 through a plurality of water supply holes 64 in the water supply trough 60.

[0073] At this time, water discharged from the pump 6 flows in this order through the pump outlet pipe 66, underground pipe 67, riser pipe 68, and distribution pipe 69. The water then flows from the distribution pipe 69 into two connecting pipes 71 and is sent to two trough pipes 70. The water in the trough pipes 70 is then discharged into the water supply trough 60 through multiple water supply holes 79. The water level rises in the water supply trough 60, and the water in the water supply trough 60 is supplied to the water absorption layer 2 and the turf layer 3 through the multiple water supply holes 64. Because the water level rises from the bottom to the top in the water supply trough 60, water is supplied to the water absorption layer 2 and the turf layer 3 preferentially from the bottom.

[0074] Since the water supply holes 64 are provided evenly over the entire right side wall 61 of the water supply trough 60, water can be supplied evenly over the entire left edge portion of the water absorbent layer 2, thereby preventing uneven water supply.

[0075] Furthermore, the trough pipe 70 is provided over many areas in the longitudinal direction within the water supply trough 60, and the water supply holes 79 are evenly provided throughout the entire trough pipe 70. Therefore, water can be supplied evenly to the water supply trough 60 in the longitudinal direction, which also allows water to be supplied evenly to the entire left edge portion of the water absorbent layer 2, thereby preventing uneven water supply.

[0076] Water supplied to the left edge of the water absorption layer 2 flows slowly toward the right edge while being absorbed into the water absorption layer 2. At this time, the downward gradient from the left edge to the right edge promotes the flow of water. The water that flows while absorbed into the water absorption layer 2 is purified by the purifying function of the water absorption layer 2 (volcanic gravel).

[0077] The water absorbed by the water absorption layer 2 is absorbed by the natural grass 47 of the turf layer 3 through its roots 49. This allows for irrigation of the natural grass 47, particularly underground irrigation or bottom irrigation. In addition, when installed outdoors, it is possible to irrigate the natural grass 47 from above using rainwater during rainfall. Excess rainwater that is not absorbed by the roots 49 within the water absorption layer 2 is purified by the water absorption layer 2.

[0078] Water that reaches the right edge of the water-absorbing layer 2 inside the container 1 penetrates into the mesh pipe 81, then flows along its longitudinal direction, and is discharged into the drainage channel 12 in the gutter 10 through the elbows 82 at both ends, i.e., is discharged from the container 1.

[0079] The water then temporarily collects in the drainage channel 12 and flows downstream rearward within the drainage channel 12. The mud is then separated from the water in the mud collecting basin 22. The water is then returned to the tank 4 through the return pipe 26.

[0080] In the case of an outdoor installation, heavy rainfall can cause a relatively large amount of water to accumulate on the grass layer 3. In this case, by using a tool such as a windshield wiper to forcibly scrape the water on the grass layer 3 into the gutter 10, the accumulated water can be removed quickly, allowing the grass layer 3 to be quickly restored to use. Of course, it is also possible to passively drain the water on the grass layer 3 into the gutter 10 by natural flow.

[0081] In addition to the surplus water supplied from the tank 4, surplus rainwater can also be collected in the tank 4. Therefore, the amount of water stored in the tank 4 can be increased by using rainwater, which is advantageous for reducing the amount of clean water used.

[0082] Water is supplied to the lawn layer 3 by opening the on-off valve 80 and turning on the pump 6. The pump 6 may be turned on automatically at a set time using a timer switch or the like, or may be turned on manually.

[0083] As described above, according to this embodiment, the turf structure including the artificial turf 41 and the natural turf 47, i.e., the turf layer 3, can be irrigated without using tap water. This eliminates or limits the use of tap water, reducing the energy required to generate tap water and the cost of using tap water. This advantage is particularly significant when the turf layer 3 covers a large area, such as when the turf layer 3 is used in a sports field or park.

[0084] Furthermore, according to this embodiment, water is supplied directly from the water supply trough 60 to the adjacent water absorption layer 2. Because the water supply trough 60 has an open top, there is a risk that foreign matter such as dust from outside may accumulate inside the water supply trough 60. Furthermore, because the water absorption layer 2 is formed from volcanic gravel, which is a granular material, there is a risk that the volcanic gravel may flow back and leak out from the water supply holes 64 and accumulate inside the water supply trough 60.

[0085] Such foreign matter in the water supply trough 60 may clog the water supply holes 64, hindering the supply of water from the water supply trough 60 to the water absorbent layer 2. However, according to this embodiment, the water supply trough 60 is exposed to the outside and its top is open, so that foreign matter clogging the water supply holes 64 can be easily found and removed. This makes it possible to prevent or suppress clogging of the water supply trough 60 with foreign matter, facilitate maintenance, and ensure a stable, uniform water supply.

[0086] In the case of a comparative example in which water is directly supplied to the water absorption layer 2 from a pipe buried in the water absorption layer 2 without providing the water supply trough 60, even if the water supply hole of the pipe is clogged with a foreign object, it would be difficult to detect the blockage, and even if it were discovered, the pipe would have to be dug up, which would be extremely inconvenient. However, in this embodiment, this does not happen, and the blockage can be easily and quickly detected and cleared.

[0087] This embodiment also has the following features.

[0088] Because the tank 4 stores excess water discharged from the container 1, the water in the tank 4 may contain Legionella bacteria. In this embodiment, the water in the tank 4 is not supplied directly to the turf layer 3 by overhead irrigation, but is instead supplied primarily to the water absorption layer 2 below the turf layer 3 for subsurface or sub-pot irrigation. Most of the water supplied to the water absorption layer 2 is absorbed by the natural turf 47 within the water absorption layer 2, and the purification function of the water absorption layer 2 reduces Legionella bacteria. Furthermore, water is supplied to the water absorption layer 2 preferentially from a position below the water absorption layer 2 that is farther from the turf layer 3. Furthermore, the base material 42 of the turf layer 3 significantly restricts the upward movement of water passing through it. These features prevent the water in the tank 4 from adhering to the surface of the turf layer 3, thereby preventing Legionella bacteria from adhering to users of the turf layer 3.

[0089] Meanwhile, the irrigation device 100 of this embodiment is also effective as a measure against torrential rain, such as the recent frequent occurrence of torrential downpours. That is, when torrential rain occurs, rainwater accumulates on normal natural turf, but with the irrigation device 100 of this embodiment, the rainwater can soak into the container 1 and be ultimately collected in the tank 4. This prevents rainwater from accumulating on the turf layer 3 and also collects excess rainwater from the surrounding area, preventing flood damage. This is particularly effective as a flood prevention measure in urban areas where green space is scarce.

[0090] Furthermore, while normal natural turf is prone to sinking and damage when people or the like step on it in muddy conditions, in this embodiment, the turf layer 3 includes artificial turf 41 and is firmly supported by the water absorption layer 2 and the foundation K, making it less likely to sink or be damaged. This makes it possible to provide a turf layer 3 with excellent durability.

[0091] However, since water that accumulates on the lawn layer 3 quickly permeates into the water absorption layer 2, a lawn layer 3 with good drainage can be provided.

[0092] Furthermore, the irrigation system 100 of this embodiment can be installed relatively freely, and is therefore effective in improving microclimates and mitigating the heat island effect by creating green spaces, etc. Furthermore, a green community space can be created all year round.

[0093] Although the embodiments of the present disclosure have been described in detail above, various other embodiments and modifications of the present disclosure are possible.

[0094] (1) For example, the right side wall 61 of the water supply trough 60 may be formed from a plate material other than perforated metal. A plurality of through holes may be formed in this plate material, and these through holes may serve as the water supply holes 64. In this case, the through holes may be formed only below the base material 42 of the turf layer 3.

[0095] (2) The water supply trough 60 may be provided with a lid that can be opened and closed to cover the open top end thereof.

[0096] (3) The configuration of the water supply pipe 65 that supplies water to the water supply trough 60 is not limited to the above configuration and can be changed.

[0097] (4) The water supply trough 60 may be located adjacent to the vessel 1 on the outside of the vessel 1 .

[0098] (5) The shapes and areas of the container 1, the water absorption layer 2, and the lawn layer 3 in plan view can be changed as desired depending on the application. They may also be divided into multiple parts.

[0099] The embodiments of the present disclosure are not limited to the above-described embodiments, and all modifications, applications, and equivalents encompassed within the spirit of the present disclosure as defined by the claims are included in the present disclosure. Therefore, the present disclosure should not be interpreted as being limited, and can be applied to any other technology that falls within the spirit of the present disclosure. [Explanation of symbols]

[0100] 1 container 2 Water absorption layer 2A 1st layer 2B 2nd layer 3. Grass layer 4 Tank 5 Water supply channel 6. Pump 12 Drainage Channel 20 Drain pipe 60 Water supply trough 61 Right side wall 64 Water supply hole 100 Irrigation equipment

Claims

1. A container and a water absorbing layer formed in the container; A turf layer formed on the water absorption layer and including artificial turf and natural turf; a tank for storing water discharged from the container; A water supply channel for supplying water to the lawn layer; a pump that sends water from the tank to the water supply channel; Equipped with The water supply passage has a water supply trough arranged along one edge of the container in a plan view. An irrigation device characterized by:

2. The water supply trough is formed in a U-shaped cross section with an open top, is disposed within the container, and has a side wall adjacent to the water absorption layer, and has a plurality of water supply holes formed therethrough. The irrigation device according to claim 1.

3. The side wall is formed of punched metal. The irrigation device according to claim 2.

4. A drain pipe is provided so as to drain water from the other end edge of the container in a plan view. The irrigation device according to claim 1.

5. a drainage channel disposed along the other edge portion on the outside of the other edge portion of the container in a plan view; The drain pipe is connected to the drain channel. The irrigation device according to claim 4.

6. The drain pipe has a mesh pipe arranged along the other edge portion inside the container and an elbow attached to the mesh pipe, The drainage channel is formed by a U-shaped gutter that is open at the top, The elbow penetrates the side wall of the U-shaped gutter and protrudes into the U-shaped gutter. The irrigation device according to claim 5.

7. A downward slope is provided from one edge of the bottom surface of the container to the other edge of the bottom surface of the container. The irrigation device according to claim 1.

8. The water absorption layer includes a lower first layer of coarse volcanic gravel and an upper second layer of fine volcanic gravel. The irrigation device according to claim 1.

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