【発明の詳細な説明】[Detailed description of the invention]
（産業上の利用分野）
本発明は道路や造成地等の法面あるいは山腹傾
斜地等における客土吹付け材料の、流失防止を計
ると共に、植物の成育に好適な土壌改良剤による
客土流失防止方法に係るものである。
（従来の技術）
道路や造成地等の法面、山腹傾斜地等は浸食作
用を受け易いので、有機質材料等の植生基材を使
用して生育基盤を形成する緑化工法によつて安定
化が図られている。
しかしながら、上記緑化工法においても施工当
初風雨等の浸食作用を受け易い為に、合成樹脂エ
マルジヨンを混入した基材を適用して比較的厚い
被覆層を設けることにより安定化させるか、又は
セメントを混入した基材を適用して基盤を安定固
化させる等の客土流失防止方法が知られている。
（発明が解決しようとする問題点）
合成樹脂エマルジヨンを混入した基材、特に客
土を中心とした基材を地表面に適用した場合には
被覆層が厚い程客土の団結に日数を要する為、未
乾燥の客土が降雨によつて流失崩壊する事が多
い。
又、セメントを混入した客土を中心にした基材
は、セメントの作用により急速に固化させること
ができる為、数時間後の降雨によつても基材が流
出崩壊しない。
しかしこの場合はセメントの強アルカリが種子
の発芽を阻害し、かつ土壌が固結しすぎることに
より植物の根の伸長を妨げる等の問題がある。
本発明者等は以上のような、従来の客土流失防
止方法の問題点を解決できる理想的な客土流失防
止方法につき種々検討した結果、焼石コウと土壌
団粒化剤を併用し、しかもそれらの好適条件を適
用することにより、土壌中の粒子間の固結を早
め、種子の発芽及び生育に影響を与えず、更に根
の伸長を阻害しない固さに保持する事が可能であ
るとの知見を得て本発明に到達した。
（問題点を解決する為の手段）
すなわち本発明は吹付用客土に対し、客土重量
比0.5〜５％の焼石コウの粉状体と、客土重量比
0.1〜0.5％の土壌団粒化剤の粉状体を混合して客
土に施用することを特徴とする客土流失防止方法
である。
本発明の構成を以下詳細に説明する。
本発明における焼石コウの使用量は客土に用い
る土質等に左右されるものではないが、客土全体
の0.5〜５重量％が適している。
これは余り少なすぎると土壌中の水分との反応
による凝結作用によつての乾燥固結時間の短縮化
が達成されず、余り多過ぎると土壌が固く成り過
ぎ発芽障害がおきたり根の伸長を妨げる傾向があ
る為である。
又、土壌団粒化剤としては、ポリエチレンオキ
サイド、ポリアクリルアマイド、ポリ酢酸ビニー
ル等の土壌団粒化剤が使用できるが、客土全体の
0.1〜0.5重量％が適している。
これは余り少なすぎると焼石コウによる固化の
緩和が成されず、多過ぎると固結作用を妨げるか
らである。
（実施例）
以下に本発明の実施例を示す。
まず、水10部に第１表に示された焼石コウ及び
土壌団粒化剤を加え、これらと真砂土200部とを
混合して各成分が均一分散した客土を得た。
上記客土を45゜の角度に傾斜させた板上に厚さ
50mmの客土層を設け、30分経過後１分間に3000c.c.
の人工雨を降らせて流出土量を比較したところの
結果は第１表の通りであつた。
又、上記で調整した客土により60mm厚の客土層
を設け、その客土層の土壌硬度を山中式土壌硬度
計で測定比較した結果は第１表の通りであつた。
更に直径９cmのシヤーレにろ紙を敷きこれに種
子ホワイトクローバー100粒を播き第１表に示し
た50倍液５mlを散布しシヤーレのふたをして定温
25℃で発芽させ、播種後10日の発芽率を比較した
結果は第１表の通りであつた。
以上の試験結果よりNo.５の焼石コウ２％、土壌
団粒化剤0.3％が総合的に最も好ましい結果を得
た為、この使用量に決定した。
(Industrial Application Field) The present invention aims to prevent soil sprayed on roads, reclaimed land, etc., from being washed away, and also to prevent the soil from being washed away using a soil conditioner suitable for plant growth. It is related to the method. (Conventional technology) Slopes of roads, reclaimed land, etc., slopes of mountainsides, etc. are susceptible to erosion, so stabilization can be achieved by greening methods that use vegetation base materials such as organic materials to form a growth base. It is being However, even in the above-mentioned greening method, since it is susceptible to erosion from wind and rain at the beginning of construction, it is necessary to stabilize it by applying a base material mixed with synthetic resin emulsion and providing a relatively thick coating layer, or by mixing cement. There are known methods to prevent soil from being washed away, such as applying a base material that has been used to stabilize and solidify the base. (Problem to be solved by the invention) When a base material mixed with a synthetic resin emulsion, especially a base material mainly consisting of soil, is applied to the ground surface, the thicker the coating layer, the more days it takes for the soil to consolidate. Therefore, the undried soil is often washed away and collapsed by rain. In addition, the base material, which is mainly composed of soil mixed with cement, can be rapidly solidified by the action of the cement, so that the base material will not be washed away and collapsed even if it rains several hours later. However, in this case, there are problems such as the strong alkali of cement inhibits the germination of seeds and the soil becomes too compacted, which inhibits the elongation of plant roots. The inventors of the present invention have conducted various studies on the ideal soil erosion prevention method that can solve the problems of the conventional soil erosion prevention methods as described above. By applying these favorable conditions, it is possible to accelerate the consolidation of particles in the soil and maintain it at a firmness that does not affect the germination and growth of seeds or inhibit root elongation. The present invention was achieved based on this knowledge. (Means for Solving the Problems) That is, the present invention uses a powder of sintered stone in an amount of 0.5 to 5% by weight of the soil, and
This is a soil washout prevention method characterized by mixing 0.1 to 0.5% of a powdered soil aggregating agent and applying the mixture to the soil. The configuration of the present invention will be explained in detail below. The amount of baked stone used in the present invention does not depend on the quality of the soil used for the soil, but 0.5 to 5% by weight of the total soil is suitable. If this amount is too low, the drying and consolidation time will not be shortened due to the coagulation effect caused by the reaction with moisture in the soil, and if it is too high, the soil will become too hard, causing problems with germination and inhibiting root elongation. This is because it tends to interfere. In addition, as a soil aggregating agent, soil aggregating agents such as polyethylene oxide, polyacrylamide, polyvinyl acetate, etc. can be used.
0.1-0.5% by weight is suitable. This is because if the amount is too small, the solidification caused by the calcined stone will not be alleviated, and if it is too large, the solidification effect will be hindered. (Example) Examples of the present invention are shown below. First, the calcined stone powder and soil aggregation agent shown in Table 1 were added to 10 parts of water, and these were mixed with 200 parts of Masago soil to obtain soil in which each component was uniformly dispersed. The above soil was placed on a board tilted at an angle of 45 degrees.
A 50mm layer of soil is placed, and after 30 minutes, 3000 c.c. per minute is generated.
Table 1 shows the results of comparing the amount of soil washed away by artificial rain. In addition, a 60 mm thick soil layer was formed using the soil prepared above, and the soil hardness of the soil layer was measured and compared using a Yamanaka soil hardness meter. The results are shown in Table 1. Furthermore, spread filter paper in a 9 cm diameter shear dish, sow 100 white clover seeds on it, sprinkle 5 ml of the 50x solution shown in Table 1, cover the shear dish, and keep at constant temperature.
The seeds were germinated at 25°C and the germination rates were compared 10 days after sowing. The results are shown in Table 1. From the above test results, No. 5, 2% baked stone powder and 0.3% soil aggregation agent, obtained the most favorable results overall, so these usage amounts were decided.
【表】
（発明の効果）
以上のように本発明は、吹付用客土に対し、客
土重量比0.5〜５％の焼石コウの粉状体と、客土
重量比0.1〜0.5％の土壌団粒化剤の粉状体を混合
して客土に施用することを特徴とする客土流失防
止方法であるから、従来、無処理の植生基材を法
面に施用したならば降雨により流亡する為、セメ
ント等の流亡防止剤を使用していたが、種子の発
芽生育に悪影響を与え、根の伸長を妨げていて困
つていた緑化工事にあつて、本発明の客土流失防
止方法を適用する事により、焼石コウと土壌団粒
化剤の相乗効果で客土の固結が早く、しかも種子
の発芽、生育に悪影響を与えず、更に根の伸長を
阻害しない固さに保持でき、植生基材の流失が防
止できるのである。[Table] (Effects of the Invention) As described above, the present invention uses powdered baked stone powder with a weight ratio of 0.5 to 5% of the top soil and soil with a weight ratio of 0.1 to 0.5% of the top soil. Since this method of preventing soil from being washed away is characterized by mixing a powdered agglomerating agent and applying it to the soil, conventionally, if untreated vegetation base material was applied to the slope, it would be washed away by rainfall. In order to prevent soil from being washed away, agents such as cement were used, but this had a negative effect on the germination and growth of seeds and hindered the growth of roots. By applying this, the synergistic effect of the baked stone powder and the soil aggregation agent allows the soil to be consolidated quickly, and is maintained at a firmness that does not adversely affect the germination and growth of seeds and also does not inhibit root elongation. , it is possible to prevent the vegetation base material from being washed away.