Foundation structure for natural turf

Abstract

To provide a base structure for natural lawn, which prevents the generation of a space water layer, appropriately grows natural lawn, efficiently moves a large number of divided fields in a short time by reducing the weight of a soil part, and reduces cost.SOLUTION: The base structure 1 for natural lawn grass for growing natural lawn grass 30 includes a soil part 10 having a lightweight soil part 11 composed of soil having a specific gravity lighter than that of sand and a sand part 12 arranged extending in the vertical direction in the lightweight soil part 11.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a base structure for natural turf on which natural turf is grown. [Background technology]

[0002] A technology has been disclosed for constructing natural grass grounds for each sport in multipurpose stadiums using a large number of transportable divided fields of natural grass (Patent Document 1). The natural grass field growing system described in Patent Document 1 is a system in which the divided fields are arranged vertically and stored in a building near the stadium for growing grass. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-115751 Summary of the Invention [Problem to be solved by the invention]

[0004] Natural turf divided fields are moved between the building and the stadium. The lighter the divided field, the more efficiently it can be moved in a short amount of time, and the lower the cost. Normally, natural turf divided fields use sand as the base. However, sand has a high specific gravity, so it is not ideal for divided fields. Therefore, there is a technology that mixes lightweight soil with sand to create the soil portion. However, if only lightweight soil is used, there are concerns about durability and the cost is high.

[0005] Figure 8 shows an example of a vertical cross section of the soil portion 110 of a conventional base structure for natural turf. As shown in Figure 8(a), the soil portion 110 of a conventional base structure for natural turf is constructed by mixing lightweight soil 111 with sand 112 in order to reduce weight. While this construction can achieve weight reduction, over time, as shown in Figure 8(b), there is a risk that the lightweight soil 111 will float and separate into layers of lightweight soil portion 113 and sand 112.

[0006] When the soil is separated into layers of lightweight soil 113 and sand 112 in this way, a perched aquifer 114 forms between the lightweight soil 113 and the sand 112, as shown in Figure 8(c). When the perched aquifer 114 forms, water cannot penetrate into the underlying sand 112 until the upper lightweight soil 113 is saturated with water. As a result, the roots of the natural grass remain around the perched aquifer 114 and do not grow into the sand 112, resulting in a failure to increase density and to take root.

[0007] The present invention aims to provide a base structure for natural turf that allows natural turf to grow properly, is lightweight, and allows a large number of divided fields to be moved efficiently in a short period of time, while also reducing costs. [Means for solving the problem]

[0008] The natural turf base structure according to the present invention comprises: A base structure for natural turf on which natural turf is grown, a lightweight soil portion made up of soil lighter than sand; In the lightweight soil portion, a sand portion is arranged extending in the vertical direction; Soil part with Equipped with. [Effects of the Invention]

[0009] The natural turf base structure of the present invention allows natural turf to grow properly and, by achieving a lightweight structure, allows a large number of divided fields to be moved efficiently in a short period of time, thereby reducing costs. [Brief explanation of the drawings]

[0010] [Figure 1] 1 shows an example of a base structure for natural turf according to this embodiment. [Figure 2] 1 shows a cross section of a soil portion of a first example of a base structure for natural turf according to the present embodiment. [Figure 3] The soil part of the pot used in the demonstration experiment is shown. [Figure 4] 10 shows a cross section of a soil portion of a second example of a base structure for natural turf according to the present embodiment. [Figure 5] 10 shows a cross section of a soil portion of a third example of a base structure for natural turf according to the present embodiment. [Figure 6] 1 shows a cross section of a soil portion used in an experiment on a base structure for natural turf according to the present embodiment. [Figure 7] The experimental results of the natural turf base structure shown in Figure 6 are shown below. [Figure 8] 1 shows an example of a vertical cross section of the soil portion of a conventional base structure for natural turf. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings. The scope necessary for the explanation to achieve the object of the present invention will be schematically shown, and the scope necessary for explaining the relevant part of the present invention will be mainly explained, and the parts that are omitted from the explanation will be based on publicly known techniques.

[0012] FIG. 1 shows an example of a natural-turf base structure 1 of this embodiment. The natural-turf base structure 1 of this embodiment comprises a soil portion 10 and a pallet 20 on which the soil portion 10 is placed. The natural-turf base structure 1 may alternatively be configured to comprise at least the soil portion 10, with the pallet 20 being used only during transportation. Furthermore, natural turf 30 takes root in the soil portion 10 and grows there.

[0013] The soil section 10 has a lightweight soil section 11 and a sand section 12. The lightweight soil section 11 may be diatomaceous earth, perlite, etc. The sand section 12 may be mountain sand, river sand, sea sand, etc. The pallet 20 may be made of wood, iron, resin, etc. The natural turf 30 may be summer turf, winter turf, etc.

[0014] The natural-turf base structure 1 comprises a soil portion 10, pallets 20, and natural turf 30, which form a divided field. A large number of divided fields are laid out to form a ground.

[0015] Figure 2 shows a cross section of the soil portion 10 of a first example of the natural-turf base structure 1 of the present embodiment. Figure 2(a) shows the AA cross section of Figure 1, and Figure 2(b) shows the IIb-IIb cross section of Figure 2(a).

[0016] The soil portion 10 of the first example has a plurality of roughly cylindrical sand portions 12 arranged in a lightweight soil portion 11. When viewed from above, as shown in Figure 2(a), the soil portion 10 of the first example has circular sand portions 12 uniformly arranged relative to the lightweight soil portion 11. When viewed in vertical cross section, as shown in Figure 2(b), the soil portion 10 of the first example has the sand portions 12 forming a rectangle extending vertically from the top to the bottom relative to the lightweight soil portion 11. The lightweight soil portion 11 contains diatomaceous earth.

[0017] In the soil portion 10 of the first example, the sand portion 12 is formed in a circular shape when viewed from above, but it does not necessarily have to be a perfect circle; it can be an ellipse or other shape, as long as it is approximately circular. Also, in the soil portion 10 of the first example, the sand portions 12 are uniformly arranged when viewed from above, but they can be spaced at different intervals. Furthermore, in the soil portion 10 of the first example, the shape is rectangular when viewed in vertical cross section, but it can be any polygonal shape, such as a square, parallelogram, or trapezoid.

[0018] Figure 3 shows the soil part 10 of the pot in the demonstration experiment. Figure 3(a) is a view of the soil part 10 of the first pot in the demonstration experiment from above, and Figure 3(b) is a cross section taken along line IIIb-IIIb in Figure 3(a). Figure 3(c) is a view of the soil part 10 of the second pot in the demonstration experiment from above, and Figure 3(d) is a cross section taken along line IIId-IIId in Figure 3(c).

[0019] A demonstration experiment conducted on a first example of the natural-turf base structure 1 of this embodiment will be described. The inventors conducted a growth experiment on natural turf 30 in pots from June 2 to November 1, 2023. The outer diameter D of the pot was 35 cm, and the height H was 25.6 cm.

[0020] The first pot has a specific gravity of approximately 1.5 ton / m 3 The soil part 10 mainly consisted of the sand part 12 of the first example. The second pot was made of the lightweight soil part 11 of the first example with a specific gravity of about 0.9 ton / m 3 The soil portion 10 in the second pot was composed mainly of diatomaceous earth. The soil portion 10 in the second pot had a lightweight soil portion 11 and three cylindrical sand portions 12 with a diameter d of 10 cm. The sand portions 12 extended vertically from the top to the bottom of the soil portion 10. In the experiment, three plants were grown in each of the first and second pots.

[0021] Sampling was performed on November 1st using a 5cm diameter core sampler for natural turf 30. The sampled natural turf 30 was washed with water to rinse off the soil, then dried in a dryer, and the dry weight of the leaves and roots was measured. The results were 3.53g for the soil in the first pot, which was mainly composed of sand 12, and 4.31g for the soil in the second pot, which was mainly composed of light soil 11, a weight difference of approximately 20%. Thus, the second pot, which used a soil portion 10 composed mainly of diatomaceous earth and three 10cm diameter cylindrical sand portions 12 extending vertically from top to bottom, showed better growth than the first pot, which was mainly composed of sand 12.

[0022] Figure 4 shows a cross section of the soil portion 10 of a second example of the natural-turf base structure 1 of the present embodiment. Figure 4(a) shows the AA cross section of Figure 1, and Figure 4(b) shows the IVb-IVb cross section of Figure 4(a).

[0023] The soil portion 10 of the second example has a plurality of approximately square pillar-shaped sand portions 12 arranged in a lightweight soil portion 11. When viewed from above, the soil portion 10 of the second example has square pillar-shaped sand portions 12 uniformly arranged relative to the lightweight soil portion 11, as shown in FIG. 4(a). When viewed in vertical cross section, the soil portion 10 of the second example has sand portions 12 that are rectangular extending vertically from the top to the bottom relative to the lightweight soil portion 11, as shown in FIG. 4(b). The lightweight soil portion 11 preferably contains diatomaceous earth. The sand portion 12 of the second example is formed in the shape of an approximately square pillar, but may also be a polygonal pillar such as a pentagonal pillar or a hexagonal pillar. In this case, when viewed from above, the sand portion 12 has a polygonal shape such as a pentagon or a hexagon.

[0024] Figure 5 shows a cross section of the soil portion 10 of a third example of the natural-turf base structure 1 of the present embodiment. Figure 5(a) shows the AA cross section of Figure 1, and Figure 5(b) shows the Vb-Vb cross section of Figure 5(a).

[0025] The soil portion 10 of the third example has a plurality of roughly cylindrical and roughly rectangular columnar sand portions 12 arranged in a lightweight soil portion 11. When viewed from above, as shown in Figure 5(a), the soil portion 10 of the third example has circular, elliptical, rectangular, or other sand portions 12 appropriately arranged relative to the lightweight soil portion 11. When viewed in vertical cross section, as shown in Figure 5(b), the soil portion 10 of the third example has a shape in which the sand portions 12 extend in the vertical direction relative to the lightweight soil portion 11. It is preferable that the lightweight soil portion 11 contain diatomaceous earth.

[0026] Next, an experiment conducted on the natural-turf base structure 1 of this embodiment will be described.

[0027] Figure 6 shows a cross section of the soil portion 10 used in the experiments on the natural-turf base structure 1 of this embodiment. Figure 6(a) shows a cross section of the natural-turf base structure 1 used in Experiment 1, Figure 6(b) shows a cross section of the natural-turf base structure 1 used in Experiment 2, and Figure 6(c) shows a cross section of the natural-turf base structure 1 used in Experiment 3.

[0028] The natural grass base structure 1 used in Experiment 1 shown in Figure 6(a) was a pot with an inner diameter of 15.9 cm and a depth of 25 cm, and four cylindrical sand sections 12 with a diameter of 6 cm were placed at the bottom in a lightweight soil section 11.

[0029] The natural grass base structure 1 used in Experiment 2 shown in Figure 6(b) was a pot with an inner diameter of 15.9 cm and a depth of 25 cm, and one cylindrical sand section 12 with a diameter of 11.4 cm was placed all the way to the bottom in a lightweight soil section 11.

[0030] The natural turf base structure 1 used in Experiment 3, shown in Figure 6(c), was a pot with an inner diameter of 15.9 cm and a depth of 25 cm, with a circular sand section 12 with an outer diameter of 15.9 cm and an inner diameter of 14 cm at the outermost part, and inside that a circular lightweight soil section 11 with an outer diameter of 14 cm and an inner diameter of 8.9 cm, inside that a circular sand section 12 with an outer diameter of 8.9 cm and an inner diameter of 4.8 cm, inside that a cylindrical lightweight soil section 11 with a diameter of 4.8 cm.

[0031] FIG. 7 shows the results of an experiment on the natural-turf base structure 1 shown in FIG.

[0032] The conventional natural turf base structure 1 used in this experiment was a pot with an inner diameter of 15.9 cm and a depth of 25 cm, and had the structure shown in Figure 8(a) in which lightweight soil 11 and sand 12 were uniformly mixed in a 1:1 ratio.

[0033] For the experiments, grass was planted on a conventional natural turf base structure (conventional) shown in Figure 8(a), a natural turf base structure 1 for experiment 1 (experiment 1) shown in Figure 6(a), a natural turf base structure 1 for experiment 2 (experiment 2) shown in Figure 6(b), and a natural turf base structure 1 for experiment 3 (experiment 3) shown in Figure 6(c), and grown in a culture device for one month. The experiments were conducted under conditions of watering with approximately 80 ml of water per day, providing light from an LED lamp with an integrated light intensity of 30 mol / m2 / day, and at an air temperature of 22°C.

[0034] The experimental results were obtained by measuring the dry weight of the turf, as shown in Figure 7. The experimental results showed no significant difference in the dry weight of the soil sections 10, 110 between Experiments 1, 2, and 3. Therefore, by arranging the sand section 12, which acts as a water passageway, extending vertically relative to the lightweight soil section 11, the soil section 10 of the natural turf base structure 1 of this embodiment is lighter, and the growth of the turf can be promoted while preventing the formation of a perched water layer 114 over the long term.

[0035] As described above, the natural-turf base structure 1 for growing natural turf 30 of this embodiment comprises a soil section 10 having a lightweight soil section 11 made of soil lighter than sand and a sand section 12 extending vertically within the lightweight soil section 11. Therefore, by preventing the formation of a perched water layer 114 and allowing the natural turf 30 to grow properly, as well as achieving a lighter soil section 10, it is possible to efficiently move a large number of divided fields in a short period of time and reduce costs.

[0036] Furthermore, in the natural-turf base structure 1 of this embodiment, the sand portion 12 extends from the upper end to the lower end of the lightweight soil portion 11. Therefore, the sand portion 12 can be appropriately positioned relative to the lightweight soil portion 11 in a short amount of time.

[0037] Furthermore, in the natural-turf base structure 1 of this embodiment, the sand portion 12 is columnar, which allows the sand portion 12 to be appropriately positioned relative to the lightweight soil portion 11 in a short amount of time.

[0038] Furthermore, in the natural-turf base structure 1 of this embodiment, the lightweight soil portion 11 contains diatomaceous earth, which allows the soil portion 10 to be made lighter, allowing a large number of divided fields to be moved efficiently in a shorter time, and also reducing costs.

[0039] Furthermore, the natural-turf base structure 1 of this embodiment includes a pallet 20 on which the soil portion 10 is placed. This allows a large number of divided fields to be moved efficiently in a shorter time, and also reduces costs.

[0040] Furthermore, the natural-turf base structure 1 of this embodiment includes natural turf 30 grown in the soil portion 10. This allows for a large number of divided fields to be moved efficiently in a shorter time, and also reduces costs.

[0041] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention, all of which are included in the technical concept of the present invention.

[0042] In the above embodiments, the features of the natural grass base structure 1 of each embodiment have been described, but the features of each embodiment may be combined as appropriate, for example, any two or more may be combined as appropriate, or all may be combined.

[0043] For example, in the natural-turf base structure 1 of this embodiment, diatomaceous earth is used as the lightweight soil portion 11, but the present invention is not limited to this, and any material having a specific gravity lighter than that of the sand portion 12 may be used.

[0044] In addition, the sand portion 12 of the natural turf base structure 1 of this embodiment extends from the upper end to the lower end of the lightweight soil portion 11, but it may not reach the lower end, and may be deep enough to extend partway from the upper end to the lower end.

[0045] Furthermore, although the sand portions 12 of the natural-turf base structure 1 of this embodiment are arranged in a columnar shape, they may also be arranged at an angle.

[0046] Furthermore, the horizontal cross-sectional shape of the sand portion 12 of the natural-turf base structure 1 of this embodiment is circular or rectangular, but it may be any shape, such as elliptical or star-shaped.

[0047] Furthermore, although nothing is installed between the lightweight soil portion 11 and the sand portion 12 of the natural turf base structure 1 of this embodiment, a boundary member with a structure that leaves gaps through which roots can grow, such as a mesh-like structure, may be installed. [Explanation of symbols]

[0048] 1...natural turf base structure, 10...soil portion, 11...lightweight soil portion, 12...sand portion, 20...Pallet, 30...Natural grass

Claims

1. A base structure for natural turf on which natural turf is grown, a lightweight soil portion made up of soil lighter than sand; In the lightweight soil portion, a sand portion is arranged extending in the vertical direction; Soil part with Equipped with A base structure for natural turf characterized by:

2. The sand portion extends from the upper end to the lower end of the lightweight soil portion.

2. The base structure for natural turf according to claim 1.

3. The sand portion is columnar.

2. The base structure for natural turf according to claim 1.

4. The lightweight soil portion contains diatomaceous earth 2. The base structure for natural turf according to claim 1.

5. A pallet is provided on which the soil portion is placed.

2. The base structure for natural turf according to claim 1.

6. The natural turf is grown in the soil portion.

2. The base structure for natural turf according to claim 1.

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