JP4257889B2 - Slope greening method - Google Patents

Slope greening method Download PDF

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JP4257889B2
JP4257889B2 JP2001298792A JP2001298792A JP4257889B2 JP 4257889 B2 JP4257889 B2 JP 4257889B2 JP 2001298792 A JP2001298792 A JP 2001298792A JP 2001298792 A JP2001298792 A JP 2001298792A JP 4257889 B2 JP4257889 B2 JP 4257889B2
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slope
net
earth
soil
vegetation
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JP2003105768A (en
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和正 柴田
昭浩 松永
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日本植生株式会社
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【0001】
【発明の属する技術分野】
本発明は、法面保護・緑化方法に関するもので、環境負荷を低減させ、かつ、周辺の生態系により近い植生を復元させる効果を有する緑化方法に係るものである。
【0002】
【従来の技術】
近年、斜面等の緑化方法では、生育の早い外来草本や肥料木等を中心とする植物による早期緑化が実施されている。このことは、斜面を早く保護することで表面侵食を防げる反面、現地の生態系を混乱させる要因ともなっており、環境保全の観点から、周辺の生態系に配慮した緑化が望まれている。
【0003】
その為、斜面を裸地のまま放置して自然にまかせたり、現地植生の埋土種子を含む表土を緑化対象地に客土する工法が開発されている。
【0004】
しかしながら、上記した方法・工法にも、いくつかの問題点があることが判明し、その解決が求められていた。
即ち、裸地のまま放置するだけでは、周辺からの飛来種子が定着しにくいため緑化に時間がかかる事や、降雨等による侵食を受けやすいという問題点が、また、表土をただ単に撒き出す又は吹付けるだけでは、降雨等により生育基盤や埋土種子が流亡したり、基盤が不安定なために発芽した種子が定着できず生育し難いという問題が存在していた。
【0005】
【発明が解決しようとする課題】
本発明は上記事情に鑑みて成されたものであり、本発明の目的は、周辺植生の種子を定着させ易くし、降雨による侵食や基盤・種子流亡を防ぐことにより、出来る限り周辺環境に負荷を与えない形で、効率的に周辺生態系に近い植生を復元させる緑化方法を提供することにある。
【0006】
【課題を解決するための手段】
即ち、本発明による緑化方法は、荒縄をより合わせ、縄の捩りが変化することにより斜面の凹凸に密着する太縄状の土砂流亡防止材を等高線状に適宜間隔で配置した、表面を繊維により毛羽立たせている植物性繊維からなる網状体を、土砂を抱え込むように保持するよう土砂流亡防止材の中央部を若干法尻方向に湾曲させて斜面に張設することを特徴としている(請求項1)。
【0007】
上記の方法によれば、この網状体を斜面に直に張設することで、降雨等による侵食防止が図られ現地植生による緑化を期することができる。太縄状の土砂流亡防止材は、斜面の凹凸に応じて自然に縄の撚りが変化することにより、斜面の凹凸に密着することができるため、土砂の堰き止め効果が非常に高い。
【0008】
よって、斜面における地表面の埋土種子の生育基盤が確保されるため、その生育と共に緑化が達成される。網状体設置場所に元来存在している埋土種子の生育を期待する場合は、網状体下に生育基盤を造成するとその下の元来在る埋土種子が発芽できないため、生育基盤は造成せずに網状体を地表面に直に敷設する。
これに加えて、周辺からの飛来種子を効率良く定着且つ保持するとともに、植生基盤となる土砂を網状体上に堆積させることができる。
【0009】
また、この網状体を、例えばダム湖岸の帯状裸地や河川護岸等の冠水斜面に張設した場合は、上記の効果に加えて、水により流されてくる浮遊種子をも捕捉且つ保持する事ができる。
【0010】
さらに、上記した堆積土砂を植生基盤にして、飛来・浮遊種子が生育するのであって、これによって飛来・浮遊種子による周辺植生の復元が、自然放置した状態よりも早期に達成されるようになる。
【0011】
また、このような網状体をすべて腐蝕性の素材で構成した場合、施工後数年で腐蝕分解され生育基盤の一部となり、周辺環境への負荷が極めて少ない。
【0012】
また、第2発明は、荒縄をより合わせ、縄の捩りが変化することにより斜面の凹凸に密着する太縄状の土砂流亡防止材を等高線状に適宜間隔で配置した、表面を繊維により毛羽立たせている植物性繊維からなる網状体を、土砂を抱え込むように保持するよう土砂流亡防止材の中央部を若干法尻方向に湾曲させて斜面に張設した後に、少なくとも施工地周辺植生の埋土種子を含む表層土を客土することを特徴とする(請求項2)。
【0013】
これにより、設置場所の埋土種子の有無に関わらず、周辺植生の種子を当初から導入出来ることから、より確実な緑化を図る上で好適である。
【0014】
こうすると、撒き出しや吹き付けにより客土された表層土は、土砂流亡防止材を等高線状に適宜間隔で配置してあるために、流亡する事無く安定し、又表層土内に含まれる周辺植生の種子も流亡すること無く順調に発芽し、周辺植生をより確実に復元することが可能である。
【0015】
このように、より確実な周辺植生の復元を図る上で、上記の施工地周辺植生の埋土種子を含む表層土を、例えば土壌改良材、保水材、有機堆肥、植物性繊維などと適宜に混合させて、これを斜面に客土する導入形態をとることも好適である。
【0016】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。図1及び図2は、例えば斜面Nの緑化の施工状況を示し、具体的には、飛来種子5及び埋土種子6による緑化方法の施工状況を示しており、この施工に際して、太縄状の土砂流亡防止材2を等高線状に適宜間隔で配置した網状体1を用意する。
【0017】
即ち、図3に示すように、本発明に使用する、太縄状の土砂流亡防止材2を等高線状に適宜間隔で配置した網状体1の形態は、ネット3に土砂流亡防止材2を等高線状に適宜間隔、例えば20〜100cm間隔で配置したものである。
【0018】
上記網状体1の具体的素材としては、例えば、法面の起伏になじみ且つ土砂扞止能力を有する程度の強度があれば、植物性、化学性、金属性のいずれの材質でもよいが、施工後植物が生育して斜面保護を植物の根茎及び茎葉で実現した段階で腐蝕して消失することが要望される場合には、植物性の、例えばヤシ繊維や麻の繊維などの素材が適している。
【0019】
上記ネット3の形態は、例えばヤシ繊維のような植物性の繊維を素材とした場合、植物性繊維をより合わせて形成した、表面を繊維により毛羽立たせている荒縄4を、植物の成長を阻害せず且つ周辺植生の種子が通入出来る程度の目合い、例えば2〜10cmの目合いで格子状に編み合わせたものである。
【0020】
また、図示はしないが、ネットを二枚重ねる、若しくはそれ以上の多層構造にすることで、網状体の強度を増加させることが出来る。
【0021】
上記土砂流亡防止材2の形態は、例えばヤシ繊維のような植物性の繊維で形成した太い、例えばφ20mm〜100mmの縄状のものであるが、取扱上φ20〜50mmが好ましい。望ましくはネット3を植物性とし、ネット3を構成する荒縄4を更に4〜10本より合わせて土砂流亡防止材2を形成することが可能である。
【0022】
植物性繊維を素材とした場合、土砂流亡防止材2・ネット3共に保水機能を有することとなり、植物の生育上好ましい。
【0023】
また、例えばオナモミやアメリカセンダングサ等の有刺種子が飛来してきた場合は、その刺を植物性繊維により捕捉しやすいため、網状体1の種子収集力が向上する。
【0024】
そして、上記網状体1の形態は、例えばネット3にスリットを入れて、そのスリットに土砂流亡防止材2を縫うように通す、接着剤によりネット3に土砂流亡防止材2を固定する、紐状物でネット3に土砂流亡防止材2を結束するなど適宜方法で、土砂流亡防止材2をネット3に等高線状となるよう装着したものである。
【0025】
図1及び図2に戻って、斜面Nの緑化の施工に際して、太縄状の土砂流亡防止材2を等高線状に適宜間隔で配置した網状体1を用意し、アンカーピン8などを用いて、この網状体1を斜面Nに固定するのである。
【0026】
上記の緑化方法によれば、斜面上に張設した網状体1が、降雨等による斜面Nの表面侵食を防止しつつ水分を蓄え、埋土種子6の生育を助長するとともに、土砂流亡防止材2により、周辺植生からの飛来種子5を効率良く定着且つ保持し、また、網状体1上に生育基盤となる堆積土砂9を形成させる。
【0027】
この際、太縄状の土砂流亡防止材の中央部を若干法尻方向に湾曲させて設置する場合もあり、流出する土砂を抱え込むように保持するため、土砂の堰き止め効果を高めることができる。
【0028】
そして、周辺植生からの飛来種子5は、土壌の少ない斜面Nであっても、網状体1からの水分供給を受け、堆積土砂9を植生基盤として発芽し、これによって斜面N上における植物の生育が、周辺生態系により近い形で、適宜の間隔を隔てて開始されることとなる。
【0029】
また、網状体1の張設方法として、通常、土砂流亡防止材2が等高線状となるように張設するが、意図的に土砂流亡防止材2を横一直線にならないよう、例えば段違いになるように網状体1を張設してもよい。
【0030】
網状体1を斜面N上に張設することに加えて、図4及び図5に示すように、少なくとも施工地周辺植生の埋土種子6を含む表層土7を客土することにより、上記と同様の効果を実現することができる。
【0031】
この場合、客土する表層土7として、緑化すべき斜面N周辺の埋土種子6を含むものを選択することが望ましく、埋土種子6を最も多く含む表面から5〜15cmの層を中心に採取しておく必要がある。採取方法は人力、あるいはバックホー等を使用し、目視可能な石礫や根株は除外するよう注意する。
【0032】
しかし、表層土7の採取域は、緑化すべき斜面Nの周辺のみに限られるものではなく、周辺植生としてより広域な植生が許容されるならば、例えば近隣の大規模な土地造成を行うニュータウンの開発域や道路等の建設域なども採取対象地とされる。
【0033】
このようにして採取した表層土7を植生基盤として、これをそのまま斜面Nに撒き出しや吹き付け等の手段で客土してもよいのであるが、例えば土壌改良材、保水材、有機堆肥、植物性繊維などを適宜に配合した植生基材に、埋土種子6を含む表層土7を混入したものを植生基盤として、これを客土してもよい。
【0034】
保水材としては、パーライト、バーミキュライト、高吸水性ポリマーなどが選択され、土壌改良材としては、ピートモス、バーク堆肥、ベントナイトが選択される。
【0035】
図4及び図5に戻って、斜面N上に張設した網状体1の土砂流亡防止材2により、降雨等による表層土7の流亡を防止し、埋土種子6の移動も防止する。
【0036】
そして、表層土7が含む先駆性の埋土種子6及び周辺からの飛来種子5は、土壌の少ない斜面Nであっても、表層土7を植生基盤として発芽し、よく生育するのであって、これによって斜面N上の植物の生育が、周辺生態系により近い形で開始されることとなる。
【0037】
また、施工地が急傾斜地であり、早期に植物による保護が必要な場合等には、トールフェスク・クリーピングレッドフェスク・メドハギ・ヤマハギ・ススキ等の植物種子を、種子吹付材あるいは厚層基材用吹付材に混入させて使用することもある。
【0038】
その場合、周辺植生との調和を図る方法として、例えば、一年草あるいは短年草といわれる、イタリアンライグラス等を少量導入すると、早期に斜面Nは植生により被覆され、その後時間経過と共にこれらの一年草は衰退していくため、生態系に影響を与えない。つまり、網状体1を斜面Nに張設した後に、この様な一年草の種子を吹付、若しくは上記植生基盤と共に客土することで、初期の表層侵食を防止し、生態系へ影響を与えずに周辺植生の復元が可能となる。
【0039】
【発明の効果】
本発明は以上のように、太縄状の土砂流亡防止材2を等高線状に適宜間隔で配置した網状体1を単に斜面に張設するのみで、太縄状の土砂流亡防止材2を等高線状に適宜間隔で配置させた事により、堆積土砂9を植生基盤として網状体1上に形成させ、安定して埋土種子6を発芽生育させるとともに、周辺からの飛来種子5を効率良く定着・保持及び発芽生育させることが可能で、従来の自然放置型緑化以上の効果を発揮することが出来た。
【0040】
更に、太縄状の土砂流亡防止材2を等高線状に適宜間隔で配置した網状体1を斜面に張設した後に、少なくとも施工地周辺植生の埋土種子6を含む表層土7を客土した場合、客土された表層土7は土砂流亡防止材2の効果で流される事無く安定し、表層土7内に含まれる埋土種子6及び周辺植生の飛来種子5が順調に発芽する為、周辺植生をより確実且つ早期に復元することができる。
【0041】
また、網状体1を形成する素材をすべて植物性のものを使用した場合、施工後数年で網状体は腐食分解され、生育基盤の一部となるとともに、周辺環境へ負荷をほとんど与えない。
【図面の簡単な説明】
【図1】 斜面に対する緑化の初期段階の状況を示す断面図である。
【図2】 斜面に対する緑化の植物生育段階の状況を示す断面図である。
【図3】 本発明に使用する網状体を示す斜視図、及び要部の拡大図である。
【図4】 別の実施形態による斜面に対する緑化の初期段階の状況を示す断面図である。
【図5】 別の実施形態による斜面に対する緑化の植物生育段階の状況を示す断面図である。
【符号の説明】
1…網状体、2…土砂流亡防止材、3…ネット、4…荒縄、5…飛来種子、6…埋土種子、7…表層土、8…アンカーピン、9…堆積土砂。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slope protection / greening method and relates to a greening method having an effect of reducing environmental burden and restoring vegetation closer to the surrounding ecosystem.
[0002]
[Prior art]
In recent years, in greening methods such as slopes, early greening has been carried out with plants such as fast-growing exotic herbs and fertilizer trees. While this can prevent surface erosion by protecting the slope early, it is also a factor that disrupts the local ecosystem. From the viewpoint of environmental conservation, greening in consideration of the surrounding ecosystem is desired.
[0003]
For this reason, methods have been developed to leave the slopes bare and leave them naturally, or to make the topsoil containing the buried seeds of local vegetation into the land to be planted.
[0004]
However, it has been found that the above-mentioned methods and construction methods have some problems, and a solution has been demanded.
In other words, it is difficult to set seeds coming from the surrounding area by simply leaving it bare, so it takes time for greening, and it is prone to erosion due to rain, etc. There are problems that just spraying causes growth bases and buried seeds to be washed away due to rainfall or the like, or seeds that have sprouted cannot be settled due to unstable bases and are difficult to grow.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and the object of the present invention is to make it easier to settle the seeds of the surrounding vegetation and to prevent the erosion and the basement / seed loss due to the rain, thereby reducing the load on the surrounding environment as much as possible. It is to provide a greening method that efficiently restores vegetation that is close to the surrounding ecosystem without giving any damage.
[0006]
[Means for Solving the Problems]
That is, in the greening method according to the present invention, a thick rope- like earth and sand spillage prevention material that closely adheres to the irregularities of the slope by twisting the rope and changing the twist of the rope is arranged at appropriate intervals in a contour line, and the surface is made of fibers. The center of the earth and sand runoff prevention material is slightly stretched in the direction of the outer edge so as to hold the net-like body of fluffed vegetable fibers so as to hold the earth and sand, and is stretched on the slope (claims) 1).
[0007]
According to the above method, by directly stretching this mesh body on the slope, it is possible to prevent erosion due to rain or the like and to promote greening by local vegetation. The thick rope-like earth and sand runoff prevention material has a very high damming effect on the earth and sand because it can adhere to the irregularities of the slope by naturally changing the twist of the rope according to the irregularities of the slope.
[0008]
Therefore, since the growth base of the buried seed on the ground surface on the slope is ensured, greening is achieved with the growth. If you expect the growth of buried seeds that are originally present at the place where the mesh body is installed, if you build a growth base under the network, the underlying buried seeds cannot germinate. Without laying the mesh body directly on the ground surface.
In addition, it is possible to efficiently fix and retain flying seeds from the surroundings, and to deposit soil and sand as a vegetation base on the net.
[0009]
In addition, when this net is stretched on a submerged slope such as a striped bare land on the shore of a dam lake or a river revetment, in addition to the above effects, it also captures and retains floating seeds washed away by water. Can do.
[0010]
Furthermore, flying seeds and floating seeds grow on the vegetation base as described above, so that the restoration of surrounding vegetation by flying seeds and floating seeds can be achieved earlier than in the case of natural standing. .
[0011]
Further, when such a net is made of a corrosive material, it is decomposed and becomes part of the growth base within a few years after construction, and the load on the surrounding environment is extremely low.
[0012]
Further, the second aspect of the present invention is that the thick rope- like earth and sand run-off prevention materials that are closely attached to the irregularities of the slope due to the twisting of the rope and twisting the rope are arranged at appropriate intervals in a contour line, and the surface is fluffed with fibers. At least the vegetation buried around the construction site after the center part of the earth and sand runoff prevention material is slightly curved in the direction of the heel to hold the net made of plant fibers to hold the earth and sand. The surface soil containing the seeds is used as the soil (claim 2).
[0013]
Thereby, the seeds of surrounding vegetation can be introduced from the beginning regardless of the presence or absence of buried seeds at the installation location, which is suitable for more reliable greening.
[0014]
In this way, the surface soil that has been soiled by spraying or spraying is stable without being washed away, and the surrounding vegetation contained in the surface soil is stable because the sediment prevention materials are arranged at appropriate intervals along the contour lines. It is possible to germinate the seeds smoothly without losing them, and to restore the surrounding vegetation more reliably.
[0015]
As described above, in order to restore the surrounding vegetation more reliably, the surface soil including the buried seeds of the vegetation around the construction site is appropriately used as a soil conditioner, water retention material, organic compost, vegetable fiber, etc. It is also suitable to adopt an introduction form in which the mixture is mixed and the soil is put on the slope.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show, for example, the construction status of greening of the slope N, specifically, the construction status of the greening method using flying seeds 5 and buried seeds 6. A net-like body 1 is prepared in which earth and sand loss prevention materials 2 are arranged in contour lines at appropriate intervals.
[0017]
That is, as shown in FIG. 3, the form of the net-like body 1 in which the thick rope-like sediment runoff prevention material 2 used in the present invention is arranged in contour lines at appropriate intervals is the net 3 with the sediment runoff prevention material 2 in the contour line. Are arranged at appropriate intervals, for example, at intervals of 20 to 100 cm.
[0018]
As a specific material of the mesh body 1, for example, any material of plant nature, chemical nature, or metal nature may be used as long as it has enough strength to adapt to the undulations of the slope and have the ability to stop sediment. If it is desired that the plant grows and the slope protection and decay are realized at the stage where the slope protection is realized by the roots and foliage of the plant, plant-based materials such as palm fiber and hemp fiber are suitable. Yes.
[0019]
The form of the net 3 is, for example, when plant fiber such as palm fiber is used as a raw material, the rough rope 4 formed by more combining plant fibers and having the surface fluffed with fibers inhibits plant growth. The mesh is knitted in a lattice pattern with a mesh size that allows the seeds of the surrounding vegetation to pass through, for example, a mesh size of 2-10 cm.
[0020]
Although not shown, the strength of the net-like body can be increased by stacking two nets or forming a multi-layered structure.
[0021]
The form of the earth and sand runoff prevention material 2 is a thick, for example, φ20 mm to 100 mm rope formed of vegetable fiber such as palm fiber, but is preferably φ20 to 50 mm in terms of handling. Desirably, the net 3 can be made vegetable, and the rough ropes 4 constituting the net 3 can be further combined from 4 to 10 to form the sediment runoff prevention material 2.
[0022]
When plant fiber is used as a raw material, both the sediment runoff prevention material 2 and the net 3 have a water retention function, which is preferable in terms of plant growth.
[0023]
In addition, for example, when barbed seeds such as Onamomi or American Sendangsa are flying, the seed collecting power of the reticulate 1 is improved because the bites are easily captured by plant fibers.
[0024]
And the form of the said net-like body 1 puts a slit in the net 3, for example, passes through the slit so as to sew the earth and sand runoff prevention material 2, and fixes the earth and sand runoff prevention material 2 to the net 3 with an adhesive. The earth and sand loss prevention material 2 is attached to the net 3 so as to be contoured by an appropriate method such as binding the earth and sand loss prevention material 2 to the net 3 with an object.
[0025]
Returning to FIG. 1 and FIG. 2, when constructing the greening of the slope N, a net-like body 1 in which thick rope-like earth and sand loss prevention materials 2 are arranged at appropriate intervals in a contour line is prepared, and anchor pins 8 or the like are used. The mesh body 1 is fixed to the slope N.
[0026]
According to the above greening method, the net-like body 1 stretched on the slope accumulates moisture while preventing surface erosion of the slope N due to rain or the like, promotes the growth of the buried seed 6, and prevents sediment runoff. 2, the flying seeds 5 from the surrounding vegetation are efficiently fixed and held, and the sedimentary sediment 9 serving as a growth base is formed on the net 1.
[0027]
At this time, the central portion of the thick rope-like earth and sand runoff prevention material may be installed slightly curved in the direction of the heel, and since it holds the outflowing earth and sand so as to hold it in, the damming effect of the earth and sand can be enhanced. .
[0028]
And even if the flying seed 5 from the surrounding vegetation is the slope N with little soil, it receives water supply from the reticulate body 1 and germinates using the sediment 9 as a vegetation base, thereby growing the plant on the slope N. However, it will start at appropriate intervals in a manner that is closer to the surrounding ecosystem.
[0029]
In addition, as a method for stretching the net-like body 1, the sediment runoff prevention material 2 is usually stretched so as to have a contour line shape. However, for example, the sediment runoff prevention material 2 is intentionally stepped so as not to be in a horizontal line. The net-like body 1 may be stretched.
[0030]
In addition to stretching the net-like body 1 on the slope N, as shown in FIGS. 4 and 5, at least the surface soil 7 including the buried seed 6 of the vegetation around the construction site is provided as above. Similar effects can be achieved.
[0031]
In this case, it is desirable to select the surface soil 7 that includes the buried seed 6 around the slope N to be greened, and the surface soil 7 is the 5 to 15 cm layer from the surface containing the most buried seed 6. It is necessary to collect it. Use human power or a backhoe for the collection method, and be careful to exclude visible stones and roots.
[0032]
However, the sampling area of the surface soil 7 is not limited to the periphery of the slope N to be greened. If wider vegetation is allowed as the surrounding vegetation, for example, a new large-scale land creation nearby Town development areas and construction areas such as roads are also subject to collection.
[0033]
The surface soil 7 collected in this way can be used as a vegetation base, and the soil can be directly sprinkled on the slope N by means of spraying or spraying. For example, soil improvement material, water retention material, organic compost, plant You may use this as a vegetation base by mixing the surface soil 7 containing the buried seed 6 with a vegetation base material appropriately blended with natural fibers.
[0034]
Perlite, vermiculite, superabsorbent polymer, etc. are selected as the water retention material, and peat moss, bark compost, and bentonite are selected as the soil conditioner.
[0035]
Returning to FIG. 4 and FIG. 5, the earth and sand runoff prevention material 2 of the net 1 stretched on the slope N prevents the runoff of the surface soil 7 due to rain or the like, and also prevents the movement of the buried seed 6.
[0036]
And the pioneering buried seed 6 included in the surface soil 7 and the flying seed 5 from the surroundings germinate using the surface soil 7 as a vegetation base and grow well even on the slope N with little soil, As a result, the growth of the plant on the slope N is started in a manner closer to the surrounding ecosystem.
[0037]
In addition, if the construction site is steeply sloped and plant protection is required at an early stage, plant seeds such as tall fescue, creeping red fescue, medhagi, yamahagi, susuki are used for seed spraying materials or thick layer base materials. Sometimes mixed with spray material.
[0038]
In that case, as a method for harmonizing with the surrounding vegetation, for example, when a small amount of Italian ryegrass, which is said to be an annual grass or a short-lived grass, is introduced, the slope N is covered with vegetation at an early stage. Since the annual grass is declining, it does not affect the ecosystem. In other words, after the net-like body 1 is stretched on the slope N, the seeds of such annual grass are sprayed or landed with the vegetation base to prevent the initial surface erosion and affect the ecosystem. The surrounding vegetation can be restored.
[0039]
【The invention's effect】
In the present invention, as described above, the thick rope-like debris run-off prevention material 2 is simply contoured on the slope and the thick rope-like debris run-off prevention material 2 is contoured. By arranging them at appropriate intervals, the sedimentary sediment 9 is formed on the reticulated body 1 as a vegetation base, and the embedded seeds 6 are stably germinated and grown, and the flying seeds 5 from the periphery are efficiently fixed. It was possible to maintain and germinate, and it was possible to demonstrate an effect that is more than that of conventional natural standing type greening.
[0040]
Furthermore, after the net-like body 1 in which the thick rope-like earth and sand loss prevention materials 2 are arranged in a contour line at appropriate intervals is stretched on the slope, the surface soil 7 including at least the buried seed 6 of the vegetation around the construction site is applied to the soil. In this case, the surface soil 7 that has been soiled by the soil is stabilized without being washed away by the effect of the sediment loss prevention material 2, and the buried seeds 6 and the flying seeds 5 in the surrounding vegetation germinate smoothly. The surrounding vegetation can be restored more reliably and quickly.
[0041]
Moreover, when all the materials which form the mesh body 1 are plant-based, the mesh body is decomposed by corrosion within a few years after the construction, and becomes a part of the growth base and hardly causes a load on the surrounding environment.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an initial stage of greening on a slope.
FIG. 2 is a cross-sectional view showing a state of a plant growth stage of greening on a slope.
FIG. 3 is a perspective view showing a mesh body used in the present invention and an enlarged view of a main part.
FIG. 4 is a cross-sectional view showing a state of an initial stage of greening on a slope according to another embodiment.
FIG. 5 is a cross-sectional view showing a state of a plant growth stage of greening on a slope according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Net body, 2 ... Sediment prevention material, 3 ... Net, 4 ... Rough rope, 5 ... Flying seed, 6 ... Embedded seed, 7 ... Surface soil, 8 ... Anchor pin, 9 ... Sedimentation sediment.

Claims (2)

  1. 荒縄をより合わせ、縄の捩りが変化することにより斜面の凹凸に密着する太縄状の土砂流亡防止材を等高線状に適宜間隔で配置した、表面を繊維により毛羽立たせている植物性繊維からなる網状体を、土砂を抱え込むように保持するよう土砂流亡防止材の中央部を若干法尻方向に湾曲させて斜面に張設することを特徴とする斜面の緑化方法。 Consisting of ropes, and thick rope- like earth and sand loss prevention materials that are closely attached to the irregularities of the slope by changing the twist of the ropes, are made of vegetable fibers whose surface is fluffed with fibers at appropriate intervals A method for greening a slope, characterized in that the center part of the sediment runoff prevention material is slightly curved in the direction of the bottom so as to hold the net so as to hold the earth and sand.
  2. 荒縄をより合わせ、縄の捩りが変化することにより斜面の凹凸に密着する太縄状の土砂流亡防止材を等高線状に適宜間隔で配置した、表面を繊維により毛羽立たせている植物性繊維からなる網状体を、土砂を抱え込むように保持するよう土砂流亡防止材の中央部を若干法尻方向に湾曲させて斜面に張設した後に、少なくとも施工地周辺植生の埋土種子を含む表層土を客土することを特徴とする斜面の緑化方法。 Consisting of ropes, and thick rope- like earth and sand loss prevention materials that are closely attached to the irregularities of the slope by changing the twist of the ropes, are made of vegetable fibers whose surface is fluffed with fibers at appropriate intervals After the net body is held on the slope by curving the central part of the sediment runoff prevention material slightly so as to hold the sediment so as to hold the sediment, at least the surface soil containing the buried seeds of the vegetation around the construction site is visited. Slope greening method characterized by soiling.
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