JP2017061636A - Slope protection agent - Google Patents

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JP2017061636A
JP2017061636A JP2015188445A JP2015188445A JP2017061636A JP 2017061636 A JP2017061636 A JP 2017061636A JP 2015188445 A JP2015188445 A JP 2015188445A JP 2015188445 A JP2015188445 A JP 2015188445A JP 2017061636 A JP2017061636 A JP 2017061636A
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alginate
slope
metal salt
drug
phosphate
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JP6563759B2 (en
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浩一朗 安野
Koichiro Yasuno
浩一朗 安野
晶子 島岡
Akiko Shimaoka
晶子 島岡
正稔 藤原
Masatoshi Fujiwara
正稔 藤原
信也 江口
Shinya Eguchi
信也 江口
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Penta Ocean Construction Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To protect a temporary slope while suppressing effects on environment.SOLUTION: A slope protection agent having polyvalent metal salt excluding magnesium salt, alginate, phosphate, natural fiber and water. The polyvalent metal salt is bi- or higher valent metal salt and not magnesium salt. Calcium salts such as calcium chloride is used as the polyvalent metal salt. The alginate is a compound containing alginic acid such as alginic acid, sodium alginate, potassium alginate, ammonium alginate, calcium alginate. The phosphate is a salt containing phosphoric acid, for example sodium phosphate.SELECTED DRAWING: None

Description

本発明は、法面保護剤に関する。   The present invention relates to a slope protection agent.

山岳橋梁等の土木工事においては、土中にコンクリート基礎構造物を構築するために、工事前に所定の設計高さまで地盤を掘り下げて切土にしてからコンクリートを構築するのが一般的である。切土の斜面(法面)は、工事期間における借地面積を抑える必要があるため、水平に対して高さが1倍から2倍程度の急な勾配になることが多い。そして、工事期間が比較的短期間であるにしても、この法面は、コンクリートを構築して埋め戻すまでの間にわたって維持されなければならない。しかし、勾配が急であると、降雨の影響により法面はしばしば崩壊に至り、その復旧に時間と費用が必要となる場合がある。   In civil engineering work such as mountain bridges, in order to construct a concrete foundation structure in the soil, it is common to construct concrete after digging the ground to a predetermined design height before construction to cut the ground. The slope (slope) of the cut often has a steep slope about 1 to 2 times higher than the horizontal, since it is necessary to reduce the leased area during the construction period. And even if the construction period is relatively short, this slope must be maintained until the concrete is built and backfilled. However, if the slope is steep, the slope often collapses due to the effects of rainfall, which may require time and money to recover.

法面を保護する方法として、セメント水を散布して固化する方法や、アンカーを打設して強度を増加させる方法、シートを法面に張る方法等がある。
また、法面を仮設的に被覆する方法として、特許文献1には、石膏またはクレーおよび水を含有する被覆組成物を吹き付けることにより被覆層を形成する方法が記載されている。
また、特許文献2には、緑化工事において土壌の吸水性と保水性を高め、植物の生長を促進するための土壌乾燥防止剤が記載されている。
As methods for protecting the slope, there are a method of solidifying by spraying cement water, a method of increasing the strength by placing anchors, a method of stretching a sheet on the slope, and the like.
As a method for temporarily covering the slope, Patent Document 1 describes a method of forming a coating layer by spraying a coating composition containing gypsum or clay and water.
Patent Document 2 describes a soil drying inhibitor for enhancing soil water absorption and water retention and promoting plant growth in greening work.

特開2003−117515号公報JP 2003-117515 A 特開2003−261872号公報Japanese Patent Laid-Open No. 2003-261872

しかし、特許文献1に記載された技術は、アスファルトと酢酸ビニル系材料を用いるため、土壌地下水等の自然環境を汚染する可能性がある。また、特許文献2に記載された技術は、吸水すると著しく強度が低下する吸水性樹脂を用いるため、法面保護剤として機能させることが困難である。そして、法面にシートを張る方法では日々の点検管理が必要となり、法面にセメント水を散布して固化する方法では工事終了後に固化したコンクリートを破砕・撤去する大規模な工事が必要となるため、いずれも仮設の法面を保護するという目的には沿わない。   However, since the technique described in Patent Document 1 uses asphalt and a vinyl acetate-based material, there is a possibility of polluting the natural environment such as soil groundwater. Moreover, since the technique described in patent document 2 uses the water absorbing resin which intensity | strength falls remarkably when it absorbs water, it is difficult to make it function as a slope protection agent. In addition, the method of stretching the sheet on the slope requires daily inspection management, and the method of solidifying by spreading cement water on the slope requires large-scale construction that crushes and removes the solidified concrete after completion of the construction. Therefore, none of them meet the purpose of protecting the temporary slope.

本発明の目的の1つは、環境への影響を抑えつつ、仮設の法面を保護することである。   One of the objects of the present invention is to protect the temporary slope while suppressing the influence on the environment.

上述した課題を解決するため、本発明の請求項1に係る法面保護剤は、マグネシウム塩を除く多価金属塩と、アルギン酸塩と、リン酸塩と、天然繊維と、を含むことを特徴とする。
本発明の請求項2に係る法面保護剤は、マグネシウム塩を除く多価金属塩と、アルギン酸塩と、リン酸塩と、天然繊維と、水と、を含むことを特徴とする。
本発明の請求項3に係る法面保護剤は、請求項2に記載された態様において、前記水の100重量部に対し、前記多価金属塩、前記アルギン酸塩、前記リン酸塩、および前記天然繊維の合計が1重量部以上、かつ、3重量部以下であることを特徴とする。
本発明の請求項4に係る法面保護剤は、請求項1から3のいずれか1項に記載された態様において、前記多価金属塩、前記アルギン酸塩、前記リン酸塩、および前記天然繊維の各重量部の合計に対する、該天然繊維の重量部の百分率が35%以上、かつ、55%以下であることを特徴とする。
本発明の請求項5に係る法面保護剤は、請求項1から4のいずれか1項に記載された態様において、前記天然繊維の長さが0.1ミリメートル以上、かつ、1.0ミリメートル以下であることを特徴とする。
In order to solve the above-described problem, the slope protecting agent according to claim 1 of the present invention includes a polyvalent metal salt excluding a magnesium salt, an alginate, a phosphate, and a natural fiber. And
The slope protecting agent according to claim 2 of the present invention is characterized by containing a polyvalent metal salt excluding a magnesium salt, an alginate, a phosphate, a natural fiber, and water.
In the aspect described in claim 2, the slope protecting agent according to claim 3 of the present invention is the polyvalent metal salt, the alginate, the phosphate, and the phosphate with respect to 100 parts by weight of the water. The total of natural fibers is 1 part by weight or more and 3 parts by weight or less.
The slope protecting agent according to claim 4 of the present invention is the aspect described in any one of claims 1 to 3, wherein the polyvalent metal salt, the alginate, the phosphate, and the natural fiber are used. The percentage by weight of the natural fiber is 35% or more and 55% or less with respect to the total of the respective parts by weight.
The slope protecting agent according to claim 5 of the present invention is the aspect described in any one of claims 1 to 4, wherein the natural fiber has a length of 0.1 mm or more and 1.0 mm. It is characterized by the following.

本発明は、環境への影響を抑えつつ、仮設の法面を保護する。   The present invention protects the temporary slope while suppressing the environmental impact.

本発明では、マグネシウム塩を除く多価金属塩と、アルギン酸塩と、リン酸塩と、天然繊維と、水とを用いる。   In the present invention, a polyvalent metal salt excluding a magnesium salt, an alginate, a phosphate, a natural fiber, and water are used.

説明に用いる用語は、以下の通り定義する。
(1)多価金属塩、アルギン酸塩、およびリン酸塩を混合したものを「混合物」と呼ぶ。
(2)混合物に天然繊維を添加したものを「薬剤」と呼ぶ。
(3)薬剤を水に溶解したものを「法面保護剤」と呼ぶ。
(4)薬剤の重量に対する天然繊維の重量の百分率を「繊維率」と呼ぶ。
(5)法面保護剤に使用した水の重量に対する薬剤の重量の百分率を「薬剤率」と呼ぶ。
Terms used in the explanation are defined as follows.
(1) A mixture of a polyvalent metal salt, an alginate, and a phosphate is called a “mixture”.
(2) A mixture obtained by adding natural fibers to a mixture is called a “drug”.
(3) A solution obtained by dissolving a drug in water is called a “slope protectant”.
(4) The percentage of the weight of the natural fiber relative to the weight of the drug is called “fiber ratio”.
(5) The percentage of the weight of the drug with respect to the weight of water used for the slope protection agent is called “drug ratio”.

多価金属塩は、二価以上の金属塩であってマグネシウム塩でないものである。多価金属塩には、例えば塩化カルシウムなどのカルシウム塩が用いられる。
アルギン酸塩は、アルギン酸を含む化合物であり、アルギン酸ナトリウム、アルギン酸カリウム、アルギン酸アンモニウム、アルギン酸カルシウムなどが挙げられる。
リン酸塩は、リン酸を含む塩であり、例えばリン酸ナトリウムなどである。
The polyvalent metal salt is a divalent or higher metal salt and not a magnesium salt. As the polyvalent metal salt, for example, a calcium salt such as calcium chloride is used.
Alginate is a compound containing alginic acid, and examples thereof include sodium alginate, potassium alginate, ammonium alginate, calcium alginate and the like.
The phosphate is a salt containing phosphoric acid, such as sodium phosphate.

(1)混合物の組成
表1は、実施例における、混合物の組成(重量百分率)を示す表である。表1に示した組成になるように、多価金属塩、アルギン酸塩、およびリン酸塩を混合し、混合物を作成した。すなわち、以下の試験に用いる試料における全ての混合物には重量百分率で、多価金属塩が30%、アルギン酸塩が65%、リン酸塩が5%、それぞれ含まれる。

Figure 2017061636
(1) Composition of mixture Table 1 is a table | surface which shows the composition (weight percentage) of a mixture in an Example. A polyvalent metal salt, an alginate, and a phosphate were mixed so as to have the composition shown in Table 1 to prepare a mixture. That is, all the mixtures in the samples used in the following tests contain 30% of the polyvalent metal salt, 65% of the alginate, and 5% of the phosphate, respectively, by weight.
Figure 2017061636

水には、水道水を用いた。多価金属塩には、硫酸カルシウム2水和物(CAS番号、10101−41−4)を用いた。アルギン酸塩には、和光純薬工業株式会社製のアルギン酸ナトリウム(CAS番号、9005−38−3)を用いた。リン酸塩には、中性のリン酸水素ナトリウム(CAS番号、7558−79−4)を用いた。天然繊維には、長さが0.1ミリメートルのパルプを用いた。   Tap water was used as water. As the polyvalent metal salt, calcium sulfate dihydrate (CAS number, 10101-41-4) was used. As alginate, sodium alginate (CAS number, 9005-38-3) manufactured by Wako Pure Chemical Industries, Ltd. was used. As the phosphate, neutral sodium hydrogen phosphate (CAS No. 7558-79-4) was used. The natural fibers used were 0.1 mm long pulp.

(2)硬化状態の観察による評価
上述した割合で混合した混合物に対して、「繊維率」が決められた値になるように、天然繊維を添加して薬剤を調整した。そして、「薬剤率」が決められた値になるように、水に薬剤を溶解させた。
(2) Evaluation by observation of the cured state The natural fiber was added to the mixture mixed at the above-described ratio so that the “fiber ratio” was determined, and the drug was adjusted. Then, the drug was dissolved in water so that the “drug ratio” was a predetermined value.

表2は、繊維率が45%となるように添加する天然繊維の重量を調節し、薬剤率が0.5%から3.5%までのいずれかになるように水に対する薬剤の重量を調節した7つの試料11〜17の配合比と評価とを示す表である。表1に示す組成の混合物に対して、表2に示す繊維率になるように天然繊維を添加して薬剤を調整した。そして、表2に示すそれぞれの重量で、薬剤を水に溶解させて法面保護剤を生成し、土砂に散布した。評価は、法面保護剤の生成から1日経過後の状態を目視して行った。評価の欄において「優」は利用に適していることを意味し、「不可」は利用できないことを意味する。   Table 2 adjusts the weight of the natural fiber added so that the fiber ratio is 45%, and adjusts the weight of the drug relative to water so that the drug ratio is anywhere from 0.5% to 3.5%. It is a table | surface which shows the compounding ratio and evaluation of seven samples 11-17 which were made. The natural fiber was added to the mixture having the composition shown in Table 1 so that the fiber ratio shown in Table 2 was obtained, and the drug was adjusted. And the chemical | medical agent was dissolved in water by each weight shown in Table 2, the slope protection agent was produced | generated, and it spread | dispersed on earth and sand. The evaluation was performed by visually observing the state after the lapse of 1 day from the generation of the slope protective agent. In the evaluation column, “excellent” means that it is suitable for use, and “impossible” means that it cannot be used.

繊維率が45%の場合、薬剤率が0.5%だと薬剤に対して水が多いため水溶液のままとなったが(試料11)、薬剤率が1.0%以上、かつ、3.0%以下であれば良好な硬化が認められた(試料12〜16)。薬剤率が3.5%だと水に対して薬剤が多いため粘性が高くなった(試料17)。

Figure 2017061636
When the fiber rate is 45%, when the drug rate is 0.5%, the amount of water is larger than that of the drug, so the aqueous solution remains (Sample 11). If it was 0% or less, good curing was observed (Samples 12 to 16). When the drug rate was 3.5%, the viscosity increased because of more drug than water (Sample 17).
Figure 2017061636

表3は、繊維率が35%となるように添加する天然繊維の重量を調節し、薬剤率が0.5%から3.5%までのいずれかになるように水に対する薬剤の重量を調節した7つの試料21〜27の配合比と評価とを示す表である。評価は、法面保護剤の生成から1日経過後の状態を目視して行った。評価の欄において「優」は利用に適していることを意味し、「不可」は利用できないことを意味する。   Table 3 adjusts the weight of natural fibers to be added so that the fiber ratio is 35%, and adjusts the weight of the drug to water so that the drug ratio is anywhere from 0.5% to 3.5%. It is a table | surface which shows the mixture ratio and evaluation of seven samples 21-27 which were made. The evaluation was performed by visually observing the state after the lapse of 1 day from the generation of the slope protective agent. In the evaluation column, “excellent” means that it is suitable for use, and “impossible” means that it cannot be used.

繊維率が35%の場合、薬剤率が0.5%だと薬剤に対して水が多いため水溶液のままとなったが(試料21)、薬剤率が1.0%以上、かつ、3.5%以下であれば良好な硬化が認められた(試料22〜27)。

Figure 2017061636
When the fiber rate is 35%, when the drug rate is 0.5%, the amount of water is larger than that of the drug, so the solution remains as an aqueous solution (Sample 21), but the drug rate is 1.0% or more; If it was 5% or less, good curing was observed (Samples 22 to 27).
Figure 2017061636

表4は、繊維率が65%となるように添加する天然繊維の重量を調節し、薬剤率が0.5%から3.5%までのいずれかになるように水に対する薬剤の重量を調節した7つの試料の配合比と評価とを示す表である。評価は、法面保護剤の生成から1日経過後の状態を目視して行った。評価の欄において「優」は利用に適していることを意味し、「不可」は利用できないことを意味する。   Table 4 adjusts the weight of natural fiber added so that the fiber ratio is 65%, and adjusts the weight of drug relative to water so that the drug ratio is anywhere from 0.5% to 3.5%. It is a table | surface which shows the mixture ratio and evaluation of seven samples which were made. The evaluation was performed by visually observing the state after the lapse of 1 day from the generation of the slope protective agent. In the evaluation column, “excellent” means that it is suitable for use, and “impossible” means that it cannot be used.

繊維率が65%の場合、薬剤率が0.5%だと薬剤に対して水が多いため水溶液のままとなったが(試料31)、薬剤率が1.0%であれば良好な硬化が認められた(試料32)。しかし、薬剤率が2.0%だと粘性の影響を受けはじめるため、土砂への浸透が十分でなくなり(試料34)、2.5%以上では粘性が高いことがわかった(試料34〜37)。

Figure 2017061636
When the fiber rate is 65%, when the drug rate is 0.5%, the amount of water is larger than that of the drug, so it remains an aqueous solution (Sample 31). Was observed (Sample 32). However, when the drug rate is 2.0%, it begins to be affected by the viscosity, so that the penetration into the earth and sand is not sufficient (Sample 34), and when it is 2.5% or more, the viscosity is high (Samples 34 to 37). ).
Figure 2017061636

表5は、繊維率が25%となるように添加する天然繊維の重量を調節し、薬剤率が0.5%から3.5%までのいずれかになるように水に対する薬剤の重量を調節した7つの試料41〜47の配合比と評価とを示す表である。評価は、法面保護剤の生成から1日経過後の状態を目視して行った。評価の欄において「優」は利用に適していることを意味し、「不可」は利用できないことを意味する。また、評価の欄において「可」は、利用できないことはないが、適していないことを意味する。   Table 5 adjusts the weight of the natural fiber added so that the fiber ratio is 25%, and adjusts the weight of the drug relative to water so that the drug ratio is anywhere from 0.5% to 3.5%. It is a table | surface which shows the mixture ratio and evaluation of seven samples 41-47 which were made. The evaluation was performed by visually observing the state after the lapse of 1 day from the generation of the slope protective agent. In the evaluation column, “excellent” means that it is suitable for use, and “impossible” means that it cannot be used. In addition, “OK” in the evaluation column means that it cannot be used but is not suitable.

繊維率が25%の場合、薬剤率が0.5%だと薬剤に対して水が多いため水溶液のままとなった(試料41)。薬剤率が1.0%以上だと硬化した後、崩れやすい(もろい)ことがわかった(試料42〜47)。

Figure 2017061636
When the fiber rate was 25%, when the drug rate was 0.5%, the amount of water was greater than that of the drug, so that the aqueous solution remained (Sample 41). It was found that when the drug ratio was 1.0% or more, it hardened (brittle) after curing (Samples 42 to 47).
Figure 2017061636

以上、試料11〜17、21〜27、31〜37、41〜47を観察した結果、繊維率は25%では不十分であり、少なくとも35%以上必要であることがわかった。また、繊維率が65%である場合は、繊維率が35%または45%である場合に比べて硬化状態が良好になる薬剤率の範囲が狭いことがわかった。   As described above, as a result of observing Samples 11 to 17, 21 to 27, 31 to 37, and 41 to 47, it was found that the fiber rate is insufficient at 25%, and at least 35% is necessary. In addition, it was found that when the fiber ratio is 65%, the range of the drug ratio at which the cured state is good is narrower than when the fiber ratio is 35% or 45%.

また、繊維率が35%または45%である場合には、薬剤率が1.0%以上、かつ、3.0%以下であればよいことがわかった。すなわち、水の100重量部に対し、多価金属塩、アルギン酸塩、リン酸塩、および天然繊維の合計は、1重量部以上、かつ、3重量部以下であればよい。   Further, it was found that when the fiber rate was 35% or 45%, the drug rate should be 1.0% or more and 3.0% or less. That is, the total of the polyvalent metal salt, alginate, phosphate, and natural fiber may be 1 part by weight or more and 3 parts by weight or less with respect to 100 parts by weight of water.

(3)施工性による評価 (3) Evaluation by workability

表6は、繊維率が55%となるように添加する天然繊維の重量を調節し、薬剤率が1.5%になるように水に対する薬剤の重量を調節するとともに、天然繊維の長さを0.1ミリメートルから15ミリメートルまでのいずれかになるように調節した7つの試料51〜57の配合比と評価とを示す表である。なお、表6には、比較例として、薬剤率が1.5%、繊維率が0%となるように調節した試料50の配合比および評価も掲載されている。

Figure 2017061636
Table 6 adjusts the weight of the natural fiber to be added so that the fiber ratio is 55%, adjusts the weight of the drug relative to water so that the drug ratio is 1.5%, and sets the length of the natural fiber. It is a table | surface which shows the mixture ratio and evaluation of seven samples 51-57 adjusted so that it might be set to either 0.1 millimeters to 15 millimeters. In Table 6, as a comparative example, the blending ratio and evaluation of the sample 50 adjusted so that the drug rate is 1.5% and the fiber rate is 0% are also listed.
Figure 2017061636

試料51〜57については薬剤を水に溶解させたとき(希釈時)の施工性について目視で観察することにより評価した。施工性とは、例えば、ポンプ圧送性が良好か否かなどである。   About samples 51-57, it evaluated by observing visually about the workability | operativity when a chemical | medical agent was dissolved in water (at the time of dilution). The workability is, for example, whether the pumpability is good.

また、試料50〜57については、施工から1月が経過した後の法面の保護状態を観察することにより評価した。そして、試料51〜53については、施工から5月が経過した後の法面の保護状態を観察することにより評価した。なお、評価の欄において「優」は利用に適していることを意味し、「不可」は利用できないことを意味する。また、評価の欄において「−」は、評価対象としないことを意味する。   Moreover, about samples 50-57, it evaluated by observing the protection state of the slope after January passed from construction. And about samples 51-53, it evaluated by observing the protection state of the slope after May passed after construction. In the evaluation column, “excellent” means that it is suitable for use, and “impossible” means that it cannot be used. In the evaluation column, “-” means not to be evaluated.

繊維率が0%の場合、1月後には法面の一部が崩壊していた。これは、天然繊維を含んでいないため、土砂中に散布された薬剤が風雨などにより流されたものと考えられる。   When the fiber rate was 0%, a part of the slope had collapsed after one month. Since this does not contain natural fibers, it is considered that the chemicals dispersed in the earth and sand were washed away by wind and rain.

また、繊維率が55%で薬剤率が1.5%である場合、繊維長が0.1ミリメートル以上、かつ、1.0ミリメートル以下であれば、施工1月後であっても保護機能が維持されていることがわかった。繊維率が55%、薬剤率が1.5%で、かつ、繊維長が2ミリメートル以上の場合、いずれも1月後には保護機能が消失していた。これは、繊維同士が絡まり合い、まとまって風雨により流されたものと考えられる。   Also, when the fiber rate is 55% and the drug rate is 1.5%, if the fiber length is 0.1 mm or more and 1.0 mm or less, the protective function is provided even after one month of construction. It was found that it was maintained. When the fiber rate was 55%, the drug rate was 1.5%, and the fiber length was 2 mm or more, the protective function was lost after 1 month. This is thought to be because the fibers were entangled and gathered together by wind and rain.

施工1月後で保護機能が維持されていた試料51〜53について、施工5月後に観察したところ、いずれの法面においても保護機能が消失していた。これは、薬剤に含まれるアルギン酸塩が生態系において分解されたためと考えられる。   When the samples 51 to 53 whose protective function was maintained after one month of construction were observed after five months of construction, the protective function was lost in any slope. This is thought to be because the alginate contained in the drug was degraded in the ecosystem.

以上の結果から、繊維率が55%、薬剤率が1.5%である場合、天然繊維の長さを0.1ミリメートル以上、かつ、1.0ミリメートル以下に調節することにより、本発明に係る法面保護剤は、1月程度の比較的短期間では法面を保護する機能を維持し、5月程度の比較的長期間では分解されて、法面を保護する機能を消失することがわかった。   From the above results, when the fiber rate is 55% and the drug rate is 1.5%, the length of the natural fiber is adjusted to 0.1 millimeters or more and 1.0 millimeters or less. Such a slope protection agent may maintain the function of protecting the slope in a relatively short period of about one month, and may be decomposed in a relatively long period of about five months to lose the function of protecting the slope. all right.

Claims (5)

マグネシウム塩を除く多価金属塩と、
アルギン酸塩と、
リン酸塩と、
天然繊維と、
を含むことを特徴とする法面保護剤。
A polyvalent metal salt excluding magnesium salt,
Alginate,
With phosphate,
Natural fibers,
A slope protection agent comprising:
マグネシウム塩を除く多価金属塩と、
アルギン酸塩と、
リン酸塩と、
天然繊維と、
水と、
を含むことを特徴とする法面保護剤。
A polyvalent metal salt excluding magnesium salt,
Alginate,
With phosphate,
Natural fibers,
water and,
A slope protection agent comprising:
前記水の100重量部に対し、前記多価金属塩、前記アルギン酸塩、前記リン酸塩、および前記天然繊維の合計が1重量部以上、かつ、3重量部以下である
ことを特徴とする請求項2に記載の法面保護剤。
The total of the polyvalent metal salt, the alginate, the phosphate, and the natural fiber is 1 part by weight or more and 3 parts by weight or less with respect to 100 parts by weight of the water. Item 3. The slope protecting agent according to Item 2.
前記多価金属塩、前記アルギン酸塩、前記リン酸塩、および前記天然繊維の各重量部の合計に対する、該天然繊維の重量部の百分率が35%以上、かつ、55%以下である
ことを特徴とする請求項1から3のいずれか1項に記載の法面保護剤。
The percentage of the weight part of the natural fiber relative to the total of the weight parts of the polyvalent metal salt, the alginate, the phosphate, and the natural fiber is 35% or more and 55% or less. The slope protecting agent according to any one of claims 1 to 3.
前記天然繊維の長さが0.1ミリメートル以上、かつ、1.0ミリメートル以下である
ことを特徴とする請求項1から4のいずれか1項に記載の法面保護剤。
The slope protecting agent according to any one of claims 1 to 4, wherein the natural fiber has a length of 0.1 mm or more and 1.0 mm or less.
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