JP2004089038A - Planting base sheet mat, and method for protecting slope with the same and sodding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a planting base sheet mat which can surely plant a plant such as turf on a slope or a flat ground. <P>SOLUTION: The planting base sheet mat 1 formed by filling a filler 4 in a porous structure 2 is characterized in that the filler 4 comprises one or more of earth and sand, fertilizers and charcoal flakes, has a granule diameter adjusted to give a solid phase rate of ≤80%, and is filled in the spaces 3 of the porous structure 2. Thereby, inclined planes such as the slopes of developed lands or river levees can surely be protected, and the greening of flat grounds and bedrocks can surely be performed. <P>COPYRIGHT: (C)2004,JPO

Description

【００６３】
このように、実施例１〜実施例４（固相率が８０％以下）では、コウライシバは、多孔質構造体に充填した土砂中に地下茎や根を伸ばし、葉の色も濃く、当初の３００ｍｍ×３００ｍｍから大きく広がって成長した。
それに対し、比較例１（固相率９０％）では地下茎や根の成長が悪く、葉の色もあまりよくない。
【００６４】
また、比較例２（固相率１００％）では、ほとんど地下茎の成長が見られず、葉が黄色になりほとんど枯れた状態となった。
更に、比較例３では、地下茎が多孔質構造体中の土砂が密に充填されていない上方の空隙部に若干伸び、根も生えていたが、下方の土砂中には入り込んでいなかった。
【００６５】
以上の実験結果は、先述した考察、即ち、充填材を充填した植栽基盤シート・マットが２０％以上の空気や水を含んでいないと、植物の根が十分に酸素を取り込むことができず、根付きが悪くなり、地下茎も伸びないという考察を裏付けるものである。
【００６６】
芝の活着が悪いのは、固相率があまりに高過ぎる（９０％以上）と、充填材中の空隙が非常に小さくなり、地下茎や根が伸びるためのスペースが少な過ぎるからであるということも考えられる。
いずれにせよ、上記実験結果から、多孔質構造体に充填する充填材は、固相率が８０％以下であることが望ましいことが分かる。
【００６７】
【発明の効果】
本発明によれば、固相率が８０％以下になるように多孔質構造体の空隙部に粒径調整した充填材を充填して植栽基盤シート・マットを形成することで、充填材に十分空気を含ませることができ、法面や平坦な地面において芝などの植物を確実に植生させることができる。
また、このような植栽基盤シート・マットを形成することにより、造成地や河川堤防の法面等の斜面を確実に保護することができ、平坦な地面や岩盤の緑化を確実に行うことができる。
【図面の簡単な説明】
【図１】図１は、本発明の植栽基盤シート・マットの構成例を模式的に説明する図である。
【図２】図２は、充填材が多孔質構造体の下方に密に詰まった状態を説明する模式図である。
【図３】図３は、熱可塑性樹脂を糸状にして絡ませたヘチマ構造の多孔質構造体の構成例を示す図である。
【図４】図４は、芝を植生させて形成した苗床型植栽基盤シート・マットを概略的に説明する断面図である。
【図５】図５は、搬送のために芝を植生させた植栽基盤シート・マットを丸めた状態を模式的に示す図である。
【図６】図６は、岩盤に本発明の植栽基盤シート・マットを敷設し固定した状態を説明する模式図である。
【図７】図７は、植物の地下茎や根が突合せ部を越えて他の植栽基盤シート・マットに進入する状態を模式的に説明する図である。
【符号の説明】
１…（苗床型）植栽基盤シート・マット
２…多孔質構造体
３…空隙部
４…充填材
５…芝
５ａ…地下茎
５ｂ…根
６…岩盤
７…固定金具
８…突合せ部[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planting base sheet mat, a slope protection method and a turf turf method using the same, and more particularly, a planting base sheet mat capable of reliably vegetating plants, and a slope using the same. It relates to a protection method and a turf method.
[0002]
[Prior art]
Embankments for construction sites, road construction, etc. usually have vegetation such as grass on the slopes to prevent runoff and erosion of soil due to rainwater and the like.
In order to more reliably protect the slope from erosion and promote vegetation, vegetation sandbags filled with culture soil, plant seeds, and the like may be stacked along the slope.
[0003]
The vegetation sandbag is often made of a nonwoven fabric or the like whose breaking strength is not so strong so as not to hinder the germination of plants.
Therefore, when an external force is applied to the slope, the slope may be easily broken, the contents may flow out and the accumulation of the sandbags may collapse, or rainwater or the like may enter from the place where the sandbags collapsed, and the slope may be eroded.
[0004]
On the other hand, a concrete revetment on a river embankment is also known to protect the slope. In this case, concrete blocks and the like are laid on the slope of the river embankment to protect the slope from erosion due to flowing water of the river.
However, the construction of concrete revetment involves enormous construction costs, and also has adverse effects such as the destruction of ecosystems and landscapes in river water areas by concrete revetment.
[0005]
In recent years, various sheets and mats (sheets and mats) have been developed as alternatives to such vegetation sandbags and concrete blocks.
By laying the sheet mat on the slope, the slope is protected from erosion by rainwater or running water from rivers.
[0006]
Such a sheet mat is often a porous structure made of synthetic fibers formed of natural fibers or synthetic fibers in the form of threads and entangled, or formed in the form of a net or tape (for example, JP-A-2001-234540). Reference).
Such a type of sheet mat is usually used by filling its voids with earth and sand (see Japanese Patent Application Laid-Open No. 2001-234520), or further laying soil thereon, and planting plants there.
[0007]
However, actually, even if such a sheet mat is laid on a slope such as a construction site or a river embankment, such a slope cannot always be sufficiently protected.
For example, when sowing seeds or transplanting turf on a sheet mat filled with earth and sand, the turf does not take root enough and dies, or the turf turns up due to external force such as running water from a river. .
[0008]
In addition, in this method, when filling with earth and sand, a sheet mat is laid on a slope or the like, and then the sheet mat is agitated with water and sprayed with muddy earth and sand.
However, if the slope of the land is steep, such as when the slope is steep, even if the sheet mat laid on the slope is filled with such muddy earth and sand, the earth and sand may flow down or accumulate below and overflow. Thus, there is a problem that the filling operation becomes very difficult.
[0009]
The development of conventional sheet mats and methods of protecting slopes using them mainly involves improving the components of the sheet mats so that they can be easily filled with earth and sand, and reducing the energy of running water to prevent erosion. It has been advanced from the viewpoint of improving the structure of the sheet mat itself to improve the effect.
[0010]
However, in order to ensure the protection of slopes and the like, it is necessary to consider how plants such as turf can be surely vegetated on slopes and the like in the future.
For example, if the vegetation on the sheet mat easily comes off or the grass is turned up, the appearance is unsightly, and it is dangerous for a person walking on it.
[0011]
[Problems to be solved by the invention]
The present invention has been made in order to overcome the above-mentioned problems against the background of the actual situation.
That is, an object of the present invention is to provide a planting base sheet / mat capable of reliably vegetating plants such as turf on a slope or flat ground.
Another object of the present invention is to provide a slope protection method for surely protecting a slope such as a slope of a land or a river embankment using such a planting base sheet / mat, and a method of upholstering that can be used for greening.
[0012]
[Means for Solving the Problems]
Thus, the present inventor has conducted intensive studies on such a background of the problem, and as a result, when filling the porous structure with the earth and sand, the porous structure was not completely filled with the earth and sand but the porous structure was filled. Filling with earth and sand so that the solid phase ratio including itself becomes 80% or less, the rooting of the plant becomes very good. Further, by forming a planting base sheet / mat in which the soil and sand are filled in advance and the plants are vegetated. It has been found that the plant can be more securely rooted without withering, and the present invention has been completed based on this finding.
[0013]
That is, the present invention is (1) a planting base sheet mat formed by filling a porous structure with a filler, wherein the filler is one of soil, fertilizer, and charcoal pieces. Or, a planting base sheet formed by filling a filler having a particle size adjusted in a void portion of the porous structure so that a solid phase ratio is 80% or less.・ Exist on the mat.
[0014]
And (2) the planting base sheet mat is present on a planting base sheet mat on which plants are vegetated.
[0015]
Also, (3) the plant is in a planting base sheet mat which is a turf.
[0016]
(4) The planting base sheet mat is a plant base sheet mat that can be rolled and conveyed.
[0017]
And (5), when the planting base sheet / mat is laid in a butt state with a plurality of planting base sheet / mats, the stems or roots of the plants of one planting base sheet / mat form a butt portion. Crossing over into another planting base sheet / mat and entangled with the porous structure of the other planting base sheet / mat or the stem or root of another plant, the plurality of planting base sheet / mats The planting base sheet mat is in the form of a single sheet.
[0018]
Also, (6), when the planting base sheet / mat is laid in a state where a plurality of planting base sheet / mats are superposed, the stems or roots of the plants of one planting base sheet / mat are superposed. The other planting base sheet / mat enters the other planting base sheet / mat over the part, and is entangled with the porous structure of the other planting base sheet / mat or the stem or root of another plant to form the plurality of planting base sheet / mat. The mat is in a planting base sheet mat where the mat is a single sheet.
[0019]
(7) The slope protection method according to any one of (2) to (6), wherein the planting base sheet / mat is used.
[0020]
(8) The method according to any one of (2) to (6), wherein the planting base sheet / mat is used.
[0021]
As long as the present invention meets this purpose, a configuration combining two or more selected from the above 1 to 8 can naturally be adopted.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the planting base sheet / mat of the present invention, the slope protection method and the upholstery method using the same will be described with reference to the drawings.
First, the planting base sheet / mat of the present invention will be described.
FIG. 1 is a diagram schematically illustrating a configuration example of a planting base sheet / mat of the present invention.
[0023]
The planting base sheet / mat 1 of the present invention includes a filler 4 in which the voids 3 of the porous structure 2 contain one of earth and sand, fertilizer, and coal pieces or a combination thereof. It is formed by adjusting the particle size and filling.
At this time, the filler 4 is filled in the voids 3 of the porous structure 2 so that the solid phase ratio is 80% or less.
[0024]
Here, the solid phase ratio means the solid phase among the three phases in the planting base sheet mat shown in FIG. 1, namely, the gas phase (air), the liquid phase (water), and the solid phase (solid portion). It is the ratio of volume.
Therefore, the concept of the solid phase includes not only the filler 4 filled in the porous structure 2 but also the porous structure itself (that is, a solid portion such as a fiber, a net, and a tape).
[0025]
The solid fraction (S) is represented by the following equation.
(Equation) S = Vs / (A · t) + (1-nc)
That is, the solid phase ratio S of the planting base sheet / mat is determined by the solid phase ratio Vs / (A · t) of the filler in the planting base sheet / mat and the solid phase ratio (1-nc) of the porous structure. ).
[0026]
Here, A is the area of the planting base sheet / mat 1 (for example, 1 m ² ), t is the thickness of the planting base sheet / mat 1, and Vs is the planting base sheet / mat (thickness t, area A). The volume of the particles of the filler 4 included, nc, represents the porosity of the porous structure 2.
Incidentally, t and nc in the above formulas are values determined by the structure of the porous structure used, and A is a value that can be arbitrarily determined.
[0027]
Actually, a target solid phase ratio S (for example, S = 0.8 if the solid phase ratio is 80%) is set, and the volume Vs of the particles of the filler 4 is calculated from the above equation.
Then, based on the calculated value Vs, the volume (or weight) of the filler to be actually filled is determined from the dry density and specific gravity of the filler.
[0028]
The solid phase ratio of 80% or less means that the ratio occupied by the filler 4 and the porous structure 2 is 80% or less. In other words, the ratio of the gas phase and the liquid phase is 20%. That is all.
That is, as will be shown later in the examples, if the planting base sheet mat filled with the filler does not contain air (or water) of this degree (20% or more), the roots of the plant will be sufficiently oxygenated. It cannot be taken in, rooting is poor, and the rhizome does not grow.
[0029]
For reference, plants such as turf did not always take root sufficiently with the conventional sheet mats because the muddy soil was densely filled in the gaps of the sheet mats, so the required amount of air (oxygen ) Could not be contained in the soil.
Alternatively, it is possible that the roots and rhizomes of the plant could not penetrate into the soil filled in the sheet mat because the packing was so dense.
[0030]
Therefore, also in the present invention, even when the solid phase ratio is 80% or less, as shown in FIG. 2, the filler 4 is unevenly distributed and is densely packed below the porous structure 2. If it does, the filling material 4 will not be in a state containing sufficient air, which is not preferable.
Therefore, the filler 4 is filled into the porous structure 2 after adjusting the particle size so that a sufficient space is secured between the particles of the filler 4 as shown in FIG. 1. It is.
[0031]
The particles of the filler 4 whose particle diameter has been adjusted in this way are in a state of being properly grasped by the porous structure 2, and even if the filler 4 contains water or the roots of the plant enter between the particles, the filler 4 is filled. The grains of the material 4 hardly break up.
Therefore, the interior of the planting base sheet / mat 1 can maintain a state in which a sufficient space exists between the particles of the filler 4 (see FIG. 1), and the solid phase ratio is 80% or less. You can stay in good condition.
[0032]
At this time, the particle size may be adjusted by a generally employed method using a sieve or the like, and the particle size of the filler is appropriately determined according to the size (size) of the void portion of the porous structure.
The filler may be filled in any of a dry state, a wet state, and a saturated state as long as a sufficient space is secured between the particles when the filler is filled as described above, and is not particularly limited.
[0033]
According to the actual construction, first lay the porous structure on the slope etc. and fix it with fixing brackets, etc., and then add the filler whose particle size has been adjusted in advance or at the construction site on the porous structure. And filled by applying vibration with a vibration pressure machine or the like.
Then, the seeds are directly sown on the planting base sheet mat thus formed, or the seeds are transplanted from the nursery to vegetate the plants.
[0034]
As the porous structure, a natural fiber or a synthetic fiber formed into a thread and entangled, or a net or a tape formed as in the related art is used.
For example, using the so-called luffa-structured erosion prevention sheet mat (see Japanese Patent Application Laid-Open No. 2001-234540), which can be constructed and removed and which can be greened, proposed by the present inventors, has low manufacturing costs, strength, and flexibility. A porous structure excellent in both properties and durability can be obtained (see FIG. 3).
[0035]
Raw materials for thermoplastic resins include olefin resins such as polyethylene, polypropylene and ethylene-vinyl acetate copolymer; polyvinyl chloride resins such as polyvinyl chloride and copolymers containing vinyl chloride as a main component; polyvinylidene chloride; Vinylidene chloride resin such as copolymer containing vinylidene as a main component, polyester resin such as polyethylene terephthalate and polybutylene terephthalate, polyamide resin such as polyamide 6, polyamide 6.6, polyamide MXD, polycarbonate, polymethyl methacrylate, etc. Acrylic resin, styrene-butadiene-based thermoplastic elastomer, ethylene-propylene-based thermoplastic elastomer, polyester-based thermoplastic elastomer, polyamide-based thermoplastic elastomer, and the like.
[0036]
Natural fibers may be used, and a combination of the above-mentioned chemical fibers and natural fibers can also be used.
Further, in order to improve the light resistance, weather resistance, elasticity, rigidity and the like, it is of course possible to color with, for example, carbon black or to add various additives as appropriate.
[0037]
The filler is exemplified by earth and sand, fertilizer, and charcoal pieces. However, wood pieces, rubble, high-molecular polymers, and the like can be appropriately used as the filler as long as they meet the purpose of the present invention.
Naturally, it is also possible to mix various soil improving materials and the like into the filler.
[0038]
The plant to be vegetated is appropriately selected depending on the purpose for which the planting base sheet / mat of the present invention is used.
For example, turf is suitable for revegetation on slopes of rivers and embankments, and of course, reeds and the like can be vegetated on slopes near the flowing waters of river embankments.
[0039]
As described above, the planting base sheet / mat of the present invention can be formed by laying a porous structure on a slope or the like and filling it with a filler such as earth and sand at a construction site, as described above.
However, in advance, the porous structure is filled with a filler and the plants are vegetated to form a planting base sheet / mat (hereinafter referred to as a nursery type planting base sheet / mat). It is also possible to transport and lay it on site.
[0040]
FIG. 4 is a cross-sectional view schematically illustrating a nursery-type planting base sheet / mat formed by vegetating grass as an example (the porous structure itself is omitted for simplicity).
In this case, the porous structure 2 is filled with a filler 4 whose particle size has been adjusted so that the solid phase ratio is 80% or less, and turf 5 such as black rice is vegetated there. To form
[0041]
At this time, if the seedbed-type planting base sheet / mat 1 (or the porous structure 2) is made to have a thickness of about 2 to 3 cm, as shown in FIG. 2 can be grown through.
However, even if the thickness is less than that, there is no particular problem because the rhizome 5a grows so as to crawl on the back surface of the nursery-type planting base sheet / mat.
[0042]
As described above, if the planting base sheet / mat is used as a nursery and seedlings are sufficiently rooted in advance, the probability of plant rooting is significantly improved compared to the case where seeds are sown after laying. Can be done.
Moreover, the seedbed-type planting base sheet / mat in which plants such as turf have been vegetated can be rolled and conveyed as schematically shown in FIG.
[0043]
Next, the slope protection method and the upholstery method using the planting base sheet / mat of the present invention will be described.
As described above, the planting base sheet / mat of the present invention is constructed by laying a porous structure on a slope such as a slope of a construction site or a river embankment, fixing the porous structure with a fixture, or the like, and then filling the porous material with a porous material. It is unwound onto a structure, filled with vibration and used (slope protection method).
[0044]
Further, for example, the present invention can be similarly applied to a flat ground (the turf lawn).
By the way, it goes without saying that in both the slope protection method and the upholstery method, the filler whose particle size is adjusted is filled so that the solid phase ratio becomes 80% or less.
[0045]
On the other hand, in either of the above methods, it is naturally possible to lay the seedbed-type planting base sheet / mat on a slope or flat ground.
The slope protection method and the turf turf method using the seedbed type planting base sheet / mat can be rolled and transported, and laid on the target surface and fixed with fixing brackets It is preferable because the operation becomes very simple as a result.
[0046]
In particular, a slope protection method using a nursery-type planting base sheet or mat is particularly effective when the slope of the embankment of a river embankment or a development site is a steep slope.
As described above, in the conventional method, a sheet mat is laid on a slope to fill with muddy earth and sand, so if the slope is steep, the earth and sand may flow downward and leak from the sheet mat. .
[0047]
However, if the seedbed-type planting base sheet / mat of the present invention is used, the particles of the filler whose particle diameter has been adjusted as described above are accurately retained on the solid elements of the porous structure, the roots of the plants, and the like. Therefore, a situation in which the filler leaks from the sheet mat unlike the conventional example cannot occur.
[0048]
It is also clear from FIG. 6 that the steep bedrock, which was difficult to protect with the conventional sheet mat, can be similarly easily protected and greened by using the nursery-type planting base sheet mat. Will.
Incidentally, it is needless to say that such a steep rock mass can be sufficiently protected by the slope protection method of the present invention in which the porous material is laid and then the filler whose particle size is adjusted is filled.
[0049]
On the other hand, the planting base sheet mat (or nursery type planting base sheet mat) of the present invention can be used for greening flat ground.
In particular, if the seedbed-type planting base sheet / mat is used, for example, the grass does not turn up even when stepping on the grass, because the grass is sufficiently extended with the roots.
[0050]
The planting base sheet mat of the present invention also has a feature that, when a plurality of planting base sheet mats are laid in abutting state, the roots of plants are connected to each other to form a single sheet.
This is the same as above even when the nursery type planting base sheet / mat is laid, or when the plant is vegetated by filling the filler after laying the porous structure. .
[0051]
FIG. 7 is a diagram schematically illustrating this state (the porous structure itself and the filler are omitted for simplicity).
When the planting base sheet / mat 1 is laid in a butt state, the stalks and roots of the plant (eg, turf 5) vegetated on one planting base sheet / mat 1 pass over the butt 8 and the other plant is easily planted. Go into the plant base sheet / mat.
[0052]
Then, the two planting base sheet mats are firmly connected by being entangled with the porous structure of another planting base sheet mat or the stem or root of another plant.
As described above, the planting base sheet mat (including the nursery bed type) of the present invention can be firmly connected to each other as described above by laying a plurality of planting base sheet mats in a butt state, as if one sheet. Greening in the form of a sheet.
[0053]
Incidentally, when a plurality of planting base sheet mats are placed in an overlapping state, the stems or roots of the plants of one planting base sheet mat enter the other planting base sheet mats over the overlapping portion.
Then, the plurality of planting base sheet mats becomes a single sheet by being entangled with the porous structure of another planting base sheet mat or the stem or root of another plant.
[0054]
【Example】
Hereinafter, an example mainly performed by focusing on the solid phase ratio will be described.
It goes without saying that the present invention is not limited to these examples.
In the experiment, under the following experimental conditions in which the filling rate of the soil and the like into the porous structure was variously changed, the rice plant was transplanted, and its rooting and the like were compared.
[0055]
[Experiment conditions]
Porous structure: Erosion-preventing sheet mat with luffa structure (see JP-A-2001-234540) [made of polypropylene, diameter of constituent fibers 0.68 mm, thickness 30 mm, area 1 mx 1 m, porous structure Solid phase ratio (1-nc) is 7.55%]
Filler (soil and sand): Sandy soil (fine grain (clay and silt) content: 15 to 50%; particle size is 4.75 mm or less when particle size is adjusted)
[0056]
Filling method: 50% of the solid phase ratio S including the solid phase ratio (1-nc) of the porous structure itself is adjusted to 50% (Example 1). ), 60% (Example 2), 70% (Example 3), 80% (Example 4), 90% (Comparative Example 1), unwinding on a porous structure, and need to be performed. Was filled by applying vibration using a vibration press machine.
[0057]
In addition, since the solid phase ratio S could not be adjusted to 100% with the particle size adjusted, water was added to the earth and sand to form a mud, and the slurry was pumped to the porous structure and vibrated by a vibrating press. A filled planting base sheet / mat was prepared (Comparative Example 2).
Further, similarly, water is added to form a muddy soil and the soil is filled so that the solid phase ratio S is 70%, and the planting base sheet is filled with the soil only under the porous structure by applying vibration. A mat was prepared (see Comparative Example 3 and FIG. 2).
[0058]
In addition, in order to confirm the solid phase ratio S of each planting base sheet / mat, after filling with earth and sand, a corner portion of each planting base sheet / mat was cut out into a circular shape having a diameter of 100 mm, and was dropped into water to be poured into water. The actual solid fraction S was calculated from the change in volume.
The results are shown in Table 1 together with the experimental results.
[0059]
〔experimental method〕
In the center of the surface of each planting base sheet / mat created as described above, a 300 mm x 300 mm black seagrass is directly transplanted, and for three months (from the beginning of April to the end of June), work such as lawn mowing, weeding, and fertilization is performed. This was performed as appropriate, and the state of turf growth (spread condition) was observed.
Three months after transplanting, the vicinity of the center of the surface of each planting base sheet / mat was cut out into a circular shape having a diameter of 100 mm, and the survival status of turf roots was visually observed.
Also, pulling the turf leaves confirmed the resistance of the turf root.
[0060]
[Experimental results and evaluation]
Table 1 shows the experimental results.
Here, regarding the growth situation,
○ Very good △ Does not spread very much × It does not spread almost and is weak.
○ Very good (wide and thick)
△ Somewhat spread but short and weak × Little spread Note Although it spreads somewhat, it spreads only in the space above the porous structure, and hardly penetrates into the soil below.
[0061]
The elongation of the root
○ Very good (penetrated into earth and sand)
△ Somewhat growing but weak × Hardly growing Further, regarding the resistance to pulling,
○ It is very resistant and only leaves come off. △ There is some resistance, but the rhizomes and roots are pulled out. × It was evaluated as if the rhizomes and roots were pulled out without resistance.
[0062]
[Table 1]

[0063]
As described above, in Examples 1 to 4 (solid phase ratio is 80% or less), the radish grows rhizomes and roots in the soil and sand filled in the porous structure, and leaves have a deep color of 300 mm. It grew greatly from 300 mm.
In contrast, in Comparative Example 1 (solid phase ratio 90%), the growth of the rhizomes and roots was poor, and the color of the leaves was not very good.
[0064]
In Comparative Example 2 (solid phase ratio 100%), almost no growth of the rhizome was observed, and the leaves became yellow and almost withered.
Furthermore, in Comparative Example 3, the rhizomes slightly extended to the upper void portion where the soil in the porous structure was not densely filled, and roots grew, but did not penetrate into the lower soil.
[0065]
The above experimental results indicate that the roots of plants cannot take in oxygen sufficiently unless the planting base sheet / mat filled with filler contains air or water of 20% or more. This supports the observation that rooting becomes worse and the rhizome does not grow.
[0066]
Poor turf survival is also attributed to the fact that if the solid fraction is too high (over 90%), the voids in the filler will be very small and there will be too little space for the rhizomes and roots to grow. Conceivable.
In any case, the above experimental results show that the filler to be filled in the porous structure preferably has a solid phase ratio of 80% or less.
[0067]
【The invention's effect】
According to the present invention, by filling the voids of the porous structure with the filler whose particle size has been adjusted so that the solid phase ratio is 80% or less to form the planting base sheet / mat, Air can be sufficiently contained, and plants such as turf can be surely vegetated on a slope or flat ground.
In addition, by forming such a planting base sheet / mat, it is possible to reliably protect slopes such as slopes of lands or river embankments, and to ensure greening of flat ground and bedrock. it can.
[Brief description of the drawings]
FIG. 1 is a diagram schematically illustrating a configuration example of a planting base sheet / mat of the present invention.
FIG. 2 is a schematic diagram illustrating a state in which a filler is densely packed below a porous structure.
FIG. 3 is a diagram illustrating a configuration example of a porous structure having a loofah structure in which a thermoplastic resin is entangled in a thread shape.
FIG. 4 is a cross-sectional view schematically illustrating a nursery-type planting base sheet / mat formed by vegetating turf.
FIG. 5 is a diagram schematically showing a state where a planting base sheet / mat in which grass is vegetated for transportation is rolled.
FIG. 6 is a schematic diagram illustrating a state where the planting base sheet / mat of the present invention is laid and fixed on a bedrock.
FIG. 7 is a diagram schematically illustrating a state in which the rhizomes and roots of the plant enter another planting base sheet mat beyond the abutting portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... (Nurse bed type) Planting base sheet / mat 2 ... Porous structure 3 ... Void 4 ... Filler 5 ... Turf 5a ... Underground stem 5b ... Root 6 ... Rock 7 ... Fixture 8 ... Butt

Claims (8)

A planting base sheet mat formed by filling a porous structure with a filler, wherein the filler includes one or a combination of earth and sand, fertilizer, charcoal pieces, and the like. A plant base sheet / mat formed by filling the voids of the porous structure with the filler whose particle size has been adjusted so that the solid phase ratio is 80% or less. The plant base sheet mat according to claim 1, wherein the plant base sheet mat is vegetated. The plant base sheet / mat according to claim 2, wherein the plant is turf. The planting base sheet mat according to claim 2, wherein the planting base sheet mat can be rolled and conveyed. When the plurality of planting base sheets / mats are laid in abutting state, the plant stems or roots of one planting base sheet / mat cross the butting portion of the other planting base sheets / mats. The plurality of planting base sheet mats form a single sheet by entering the sheet mat and entangled with the porous structure of the other planting base sheet mat or stems or roots of other plants. The planting base sheet / mat according to any one of claims 2 to 4, wherein: When the plurality of planting base sheet mats are laid in a superposed state, the plant stems or roots of one planting base sheet / mat cross over the overlapping portion and the other planting base sheets / mats overlap with each other. The plurality of planting base sheets / mats form a single sheet by entering the planting base sheet / mat and entangled with the porous structure of the other planting base sheet / mat or stems or roots of other plants. The planting base sheet / mat according to any one of claims 2 to 4, wherein: The slope protection method according to any one of claims 2 to 6, wherein the planting base sheet / mat is used. The upholstered turf construction method according to any one of claims 2 to 6, wherein the planting base sheet / mat is used.

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