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JP2019176755A - Ridge making method - Google Patents

Ridge making method Download PDF

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JP2019176755A
JP2019176755A JP2018066809A JP2018066809A JP2019176755A JP 2019176755 A JP2019176755 A JP 2019176755A JP 2018066809 A JP2018066809 A JP 2018066809A JP 2018066809 A JP2018066809 A JP 2018066809A JP 2019176755 A JP2019176755 A JP 2019176755A
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soil
cocoon
solidification
strength
ground
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JP7080087B2 (en
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俊吉 須藤
Shunkichi Sudo
俊吉 須藤
神谷 隆
Takashi Kamiya
隆 神谷
守屋 政彦
Masahiko Moriya
政彦 守屋
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Taiheiyo Cement Corp
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Abstract

【課題】雑草の生育が抑制された畦を造成することができる方法を提供する。【解決手段】畦の造成に使用する土壌を採掘する地盤から、土壌の試料を採取する土壌採取工程、土壌の試料と、使用予定の固化材を混合して、混合物を得た後、混合物について固化後の強度を測定し、得られた測定値に基いて、雑草の生育を抑制するための固化材の種類及び量を定める固化材決定工程、及び、固化材決定工程で定めた固化材の種類及び量で、地盤に畦を造成する畦造成工程、を含む畦造成方法。【選択図】なしAn object of the present invention is to provide a method capable of constructing a ridge in which weed growth is suppressed. SOLUTION: A soil sampling step of sampling a soil sample from the ground for mining the soil to be used for ridge formation, mixing the soil sample with a solidifying material to be used, and obtaining a mixture. The strength after solidification is measured, and based on the obtained measured values, the solidification material determination step for determining the type and amount of solidification material for suppressing the growth of weeds, and the solidification material determined in the solidification material determination step A ridge creation method including a ridge creation step of creating a ridge on the ground in kind and amount. [Selection diagram] None

Description

本発明は、畦造成方法に関する。   The present invention relates to a cocoon building method.

水田の畦は、水田に水を貯める目的で、通常、水田の中の泥土を盛り上げて造られる。また、畦自体が通路としての機能を有している。
畦に雑草が繁茂すると、例えば、斑点米の原因となるカメムシの侵入源となる等、病虫害の発生源となるとともに、日照や通風の確保が困難となる。また、畦から水田に侵入する雑草や、景観の悪化を防ぐ等の観点から、草刈作業を行って畦の管理を行う必要がある。しかし、平面のみならず斜面も有する畦を、刈払機等を用いて行われる草刈りは、容易な作業ではなく、高齢化が進んでいる地域では特に問題となっている。
水田の畦において、表面を硬化させて雑草の生育を抑制する目的でセメント系材料を用いた場合、セメントに起因するアルカリが稲の生育を阻害する恐れがあるほか、有機物の含有量の多い土壌の固化は難しくなるという問題がある。また、畦を解体する際には、セメントには微量元素などが含まれるため、解体した硬化層を作土として再利用することが困難であるという問題がある。
Paddy paddy is usually made by raising mud in the paddy field for the purpose of storing water in the paddy field. Moreover, the bag itself has a function as a passage.
When weeds grow on the reeds, for example, it becomes a source of stink bugs that cause speckled rice, and it is difficult to secure sunlight and ventilation. In addition, from the viewpoint of preventing weeds that enter the paddy field from the reed and the deterioration of the landscape, it is necessary to manage the reed by performing mowing work. However, mowing with not only a flat surface but also a slope using a brush cutter or the like is not an easy task and is particularly problematic in an aging region.
In the paddy field, when cement-based materials are used to harden the surface and suppress the growth of weeds, the alkali caused by the cement may inhibit the growth of rice, and the soil contains a large amount of organic matter. There is a problem that it becomes difficult to solidify. In addition, when demolishing the soot, since the cement contains trace elements and the like, there is a problem that it is difficult to reuse the demolished hardened layer as soil.

特許文献1には、地面に供給されて、水と反応して硬化し、地面に硬化層を形成して雑草の繁殖を防止する雑草繁殖防止材において、酸化マグネシウムと増量材を含み、酸化マグネシウムが水と反応して硬化するようにしてなることを特徴とする雑草繁殖防止材が記載されている。
また、特許文献2には、土壌表面に粉状のマグネシアを敷均しする工程と、上記マグネシアの上に表層土を敷均しする工程と、上記表層土の表面に散水を行う工程と、表層土を加圧する工程とを有することを特徴とする土壌の防草工法が記載されている。
Patent Document 1 discloses a weed growth prevention material that is supplied to the ground, reacts with water and hardens, and forms a hardened layer on the ground to prevent weed growth. A material for preventing weed reproduction is described in which is cured by reacting with water.
Patent Document 2 includes a step of spreading powdered magnesia on the soil surface, a step of spreading surface soil on the magnesia, a step of watering the surface of the surface soil, And a method for pressurizing the surface soil.

特開2003−47388号公報JP 2003-47388 A 特許第5940326号公報Japanese Patent No. 5940326

本発明の目的は、雑草の生育が抑制された畦を造成することができる方法を提供することである。   An object of the present invention is to provide a method capable of creating a cocoon in which the growth of weeds is suppressed.

本発明者は、上記課題を解決するために鋭意検討した結果、畦の造成に使用する土壌を採掘する地盤から、試料を採取する工程と、該試料と固化材を混合して混合物を得た後、該混合物について固化後の強度を測定し、得られた測定値に基いて固化材の種類及び量を定める工程、及び、該工程で定めた固化材の種類及び量で地盤に畦を造成する工程を含む畦造成方法によれば、上記目的を達成できることを見出し、本発明を完成した。
すなわち、本発明は、以下の[1]〜[5]を提供するものである。
[1] 畦の造成に使用する土壌を採掘する地盤から、土壌の試料を採取する土壌採取工程、上記土壌の試料と、使用予定の固化材を混合して、混合物を得た後、上記混合物について固化後の強度を測定し、得られた測定値に基いて、雑草の生育を抑制するための固化材の種類及び量を定める固化材決定工程、及び、上記固化材決定工程で定めた固化材の種類及び量で、地盤に畦を造成する畦造成工程、を含むことを特徴とする畦造成方法。
[2] 上記固化材が、軽焼酸化マグネシウム粉末である前記[1]に記載の畦造成方法。
[3] 上記固化材決定工程及び上記畦造成工程において、上記土壌の試料及び上記固化材に加えて、骨材を用いる前記[1]又は[2]に記載の畦造成方法。
[4] 上記固化材決定工程における上記固化後の強度が、一軸圧縮強さ、または、土壌硬度計を用いて得られる硬度である前記[1]〜[3]のいずれかに記載の畦造成方法。
[5] 上記畦造成工程で造成される畦が、既存の畦の代替物、または、新たに造成される畦である前記[1]〜[4]のいずれかに記載の畦造成方法。
As a result of diligent studies to solve the above-mentioned problems, the present inventor obtained a mixture by mixing a sample and a solidifying material with a step of collecting a sample from the ground for mining the soil used for the construction of the fence. After that, the strength after solidification of the mixture is measured, and the type and amount of the solidified material are determined based on the obtained measurement value, and the ridge is formed on the ground with the type and amount of the solidified material determined in the step. The present invention has been completed by finding that the above object can be achieved by the method for producing a cocoon including the step of performing the above.
That is, the present invention provides the following [1] to [5].
[1] A soil sampling process for collecting a soil sample from the ground for mining the soil to be used for the construction of the dredger, the above soil sample and the solidified material to be used are mixed to obtain a mixture, and then the above mixture The strength after solidification is measured, and the solidification material determination step for determining the type and amount of the solidification material for suppressing the growth of weeds based on the obtained measurement value, and the solidification determined in the solidification material determination step. A method for producing a cocoon, comprising a cocoon production step for producing a cocoon on the ground with the type and amount of the material.
[2] The cocoon forming method according to [1], wherein the solidified material is light-burned magnesium oxide powder.
[3] The cocoon formation method according to [1] or [2], in which the aggregate is used in addition to the soil sample and the solidification material in the solidification material determination step and the cocoon formation step.
[4] The cocoon formation according to any one of [1] to [3], wherein the strength after the solidification in the solidification material determination step is a uniaxial compressive strength or a hardness obtained using a soil hardness meter. Method.
[5] The cocoon formation method according to any one of [1] to [4], wherein the cocoon produced in the cocoon production process is an alternative to an existing cocoon or a newly produced cocoon.

本発明の畦造成方法によれば、雑草の生育が抑制された畦を造成することができる。   According to the method for producing cocoons of the present invention, cocoons in which the growth of weeds is suppressed can be produced.

以下、本発明の畦造成方法について、工程ごとに詳しく説明する。
[土壌採取工程]
本工程は、畦の造成に使用する土壌を採掘する地盤から、土壌の試料を採取する工程である。該地盤は、特に限定されるものではなく、畦を造成する予定の場所(水田)の状況に応じて適宜定めればよいが、通常、畦を造成する場所の近傍の地盤である。
[固化材決定工程]
本工程は、土壌採取工程の後に行われる工程であって、前工程で採取した土壌の試料と、使用予定の固化材を混合して、混合物を得た後、該混合物について固化後の強度を測定し、得られた測定値に基いて、雑草の生育を抑制するための固化材の種類及び量を定める工程である。
Hereinafter, the method for producing a straw of the present invention will be described in detail for each step.
[Soil collection process]
This step is a step of collecting a soil sample from the ground for mining the soil used for the construction of the straw. The ground is not particularly limited, and may be appropriately determined according to the situation of the place (paddy field) where the paddy is to be built, but is usually the ground near the place where the paddy is built.
[Solidification material determination process]
This step is a step performed after the soil collection step, and after mixing the soil sample collected in the previous step and the solidified material to be used to obtain a mixture, the strength after solidification of the mixture is determined. This is a step of determining the type and amount of the solidifying material for suppressing the growth of weeds based on the measured values obtained by measurement.

使用予定の固化材の種類は、畦を造成する予定の場所(水田)の状況や、畦の造成に使用する土壌に応じて適宜定めればよい。中でも、有機物の含有量が多い土壌であっても容易に固化することができ、造成後の畦(畦を構成する土壌)から溶出するアルカリに起因して水田における稲の生育を阻害する恐れがなく、造成された畦を解体する際に、解体後の土壌を作土等として再利用することが容易となり、さらには、硫酸カルシウムや硫酸マグネシウムを含まず、硫化水素の発生の恐れがない等の観点から、軽焼酸化マグネシウム粉末が好適である。
軽焼酸化マグネシウムは、炭酸マグネシウムおよび水酸化マグネシウムの少なくとも1種を主成分とする鉱物を、650〜1,000℃で焼成することで得られる軽焼マグネシアである。
The type of solidified material to be used may be determined as appropriate according to the situation of the place (paddy field) where the straw is to be created and the soil used for the construction of the straw. Above all, even soils with a high organic content can be easily solidified, and there is a risk of hindering rice growth in paddy fields due to alkali elution from the straw after construction (soil constituting the straw). In addition, when dismantling the constructed soot, it becomes easy to reuse the dismantled soil as a soil, etc., and it does not contain calcium sulfate or magnesium sulfate, and there is no risk of hydrogen sulfide generation, etc. From this point of view, light-burned magnesium oxide powder is preferred.
Lightly burned magnesium oxide is lightly burned magnesia obtained by firing a mineral mainly composed of at least one of magnesium carbonate and magnesium hydroxide at 650 to 1,000 ° C.

炭酸マグネシウムを主成分とする鉱物の例としては、マグネサイト、ドロマイト等が挙げられる。この場合、鉱物中の炭酸マグネシウムの含有率は、好ましくは80質量%以上、より好ましくは85質量%以上、特に好ましくは90質量%以上である。
水酸化マグネシウムを主成分とする鉱物の例としては、ブルーサイト等が挙げられる。この場合、鉱物中の水酸化マグネシウムの含有率は、好ましくは80質量%以上、より好ましくは85質量%以上、特に好ましくは90質量%以上である。
焼成温度は、650〜1,000℃、好ましくは750〜900℃、より好ましくは800〜900℃である。該温度が650℃未満であると、軽焼マグネシアが生成しにくくなる。該温度が、1,000℃を超えると、固化材の土壌を固化する性能が低下する場合がある。
Examples of minerals mainly composed of magnesium carbonate include magnesite and dolomite. In this case, the content of magnesium carbonate in the mineral is preferably 80% by mass or more, more preferably 85% by mass or more, and particularly preferably 90% by mass or more.
Examples of minerals mainly composed of magnesium hydroxide include brucite. In this case, the content of magnesium hydroxide in the mineral is preferably 80% by mass or more, more preferably 85% by mass or more, and particularly preferably 90% by mass or more.
A calcination temperature is 650-1,000 degreeC, Preferably it is 750-900 degreeC, More preferably, it is 800-900 degreeC. When the temperature is lower than 650 ° C., lightly burned magnesia is hardly generated. When this temperature exceeds 1,000 degreeC, the performance which solidifies the soil of a solidification material may fall.

軽焼酸化マグネシウム粉末のブレーン比表面積は、好ましくは3,000〜10,000cm/g、より好ましくは4,000〜8,000cm/g、特に好ましくは4,500〜7,000cm/gである。該ブレーン比表面積が3,000cm/g以上であれば、固化材の土壌を固化する性能がより向上する。該ブレーン比表面積が10,000cm/g以下であれば、固化材の製造にかかる労力を低減することができる。
使用予定の固化材の量(土壌1mあたりの質量)は、固化材の種類や、畦を造成する予定の場所(水田)の状況や、畦の造成に使用する土壌に応じて適宜定めればよいが、例えば、造成された畦の強度をより向上する観点から、好ましくは50kg/m以上、より好ましくは80kg/m以上、特に好ましくは150kg/m以上である。
Blaine specific surface area of the light burned magnesium oxide powder is preferably 3,000~10,000cm 2 / g, more preferably 4,000~8,000cm 2 / g, particularly preferably 4,500~7,000cm 2 / g. When the brain specific surface area is 3,000 cm 2 / g or more, the performance of solidifying the soil of the solidified material is further improved. If the Blaine specific surface area is 10,000 cm 2 / g or less, the labor required for producing the solidified material can be reduced.
The amount of solidifying material for use schedule (mass per soil 1 m 3) the type of the solidifying material and, and situation where you plan to construct a ridge (paddy), is appropriately determined depending on the soil to be used for reclamation of ridge For example, from the viewpoint of further improving the strength of the formed ridge, it is preferably 50 kg / m 3 or more, more preferably 80 kg / m 3 or more, and particularly preferably 150 kg / m 3 or more.

土壌の試料と、使用予定の固化材を混合する手段としては、特に限定されるものではなく、例えば、各種のミキサ(例えば、パドルミキサ、強制撹拌型ミキサ、パン型ミキサ、ロータリーハンマミキサ、4軸直列混合式ミキサ等)が挙げられる。
得られた混合物について固化後の強度の例としては、一軸圧縮強さ、土壌硬度計を用いて得られる硬度等が挙げられる。
一軸圧縮強さは、「JIS A 1216:2009(土の一軸圧縮試験方法)」に準拠して測定することができる。
一軸圧縮強さの測定値は、好ましくは300kN/m以上、より好ましくは350kN/m以上、特に好ましくは400kN/m以上である。該測定値が300kN/m以上であれば、畦における雑草の生育を十分に抑制することができると判断できる。
The means for mixing the soil sample and the solidified material to be used is not particularly limited. For example, various mixers (for example, a paddle mixer, a forced stirring mixer, a pan mixer, a rotary hammer mixer, a four-axis mixer, etc. Serial mixing mixer).
Examples of the strength after solidification of the obtained mixture include uniaxial compressive strength, hardness obtained using a soil hardness meter, and the like.
The uniaxial compressive strength can be measured according to “JIS A 1216: 2009 (soil uniaxial compression test method)”.
The measured value of the uniaxial compressive strength is preferably 300 kN / m 2 or more, more preferably 350 kN / m 2 or more, and particularly preferably 400 kN / m 2 or more. If the measured value is 300 kN / m 2 or more, it can be determined that the growth of weeds in the cocoon can be sufficiently suppressed.

土壌硬度計を用いて得られる硬度は、例えば、山中式土壌硬度計を用いて得ることができる。
山中式土壌硬度計を用いて得られる硬度(カタサ指数)の測定値は、好ましくは30mm以上、より好ましくは35mm以上、特に好ましくは40mm以上である。該硬度(カタサ指数)が30mm以上であれば、畦における雑草の生育を十分に抑制することができることと判断できる。
The hardness obtained using a soil hardness meter can be obtained using, for example, a Yamanaka soil hardness meter.
The measured value of hardness (Kathasa index) obtained using a Yamanaka type soil hardness meter is preferably 30 mm or more, more preferably 35 mm or more, and particularly preferably 40 mm or more. If the hardness (Kathasa index) is 30 mm or more, it can be judged that the growth of weeds in the straw can be sufficiently suppressed.

本工程において、実際に畦を造成する前に、畦の造成に使用する土壌の試料を用いて得られた測定値を得た後、該測定値に基いて、雑草の生育を抑制するための固化材の種類及び量を定めることで、畦造成工程(後述)において造成された畦の強度を、雑草の生育を十分に抑制しうる強度にすることができる。   In this step, after actually obtaining the measurement value obtained using the soil sample used for the formation of the straw before actually creating the straw, based on the measurement value, for suppressing the growth of weeds By determining the type and amount of the solidifying material, the strength of the straw produced in the straw production process (described later) can be set to a strength that can sufficiently suppress the growth of weeds.

造成作業にかかる労力を低減する観点から、畦造成工程(後述)において、畦の造成に使用する土壌(本工程で、畦を造成する対象である地盤から、土壌の試料として採取された土壌と同じもの)は、通常、水田付近の土壌である。該土壌は、粒径が0.075mm以下である粘土・シルト(細粒分)に分類される土粒子の割合が多い一方で、粒径0.075mm〜2mmの細砂・中砂・粗砂(砂)に分類される土粒子の割合が少ない場合が多い。このような土壌を用いた場合、造成された畦の強度が小さくなる場合がある。
固化材の量をより多くすることなく、造成された畦の強度をより大きくする目的で、畦造成工程において、畦の造成に使用する土壌及び固化材に加えて、骨材を用いてもよい。
From the viewpoint of reducing the labor required for the creation work, in the soot creation process (described later), the soil used for the construction of the soot (the soil collected as a soil sample from the ground on which the soot is created in this process) The same) is usually soil near paddy fields. The soil has a large proportion of soil particles classified as clay / silt (fine particles) having a particle size of 0.075 mm or less, while fine sand / medium sand / coarse sand having a particle size of 0.075 mm to 2 mm. In many cases, the percentage of soil particles classified as (sand) is small. When such soil is used, the strength of the constructed ridge may be reduced.
Aggregate may be used in addition to the soil and solidification material used for cocoon formation in the cocoon formation process for the purpose of increasing the strength of the produced cocoon without increasing the amount of solidification material. .

畦造成工程で骨材を加える場合、本工程において、土壌の試料と固化材と骨材を混合して得られた混合物の強度の測定値に基づいて、固化材の種類及び量、並びに、骨材の種類及び量を定める。
使用予定の骨材の種類は、畦を造成する予定の場所(水田)の状況や、畦の造成に使用する土壌に応じて適宜定めればよく、特に限定されるものではない。具体的には、珪砂、山砂、鋳物砂等が挙げられる。
骨材は、造成された畦の強度をより大きくする観点から、好ましくは粒度が0.425mm〜2.36mmである粒子(粒体)が60質量%以上であり、かつ、粒度が2.36mmを超える粒子が5質量%以下である粒度分布を有するものであり、より好ましくは粒度が0.5mm〜2.36mmである粒子が60質量%以上であり、粒度が2.36mmを超える粒子が1質量%以下である粒度分布を有するものである。
なお、上記粒度の値は、篩の目開き寸法に対応する値である。
上記粒度分布を有する骨材(珪砂)としては、例えば、市販の3号珪砂50質量部と4号珪砂50質量部を混合すること等によって容易に作製することができる。
When adding aggregate in the cocoon building process, in this process, based on the measured strength of the mixture obtained by mixing the soil sample, the solidified material and the aggregate, the type and amount of the solidified material, and the bone Determine the type and amount of material.
The type of aggregate to be used may be determined as appropriate according to the situation of the place (paddy field) where the straw is planned and the soil used for the construction of the straw, and is not particularly limited. Specific examples include quartz sand, mountain sand, and foundry sand.
From the viewpoint of increasing the strength of the formed heel, the aggregate preferably has 60% by mass or more of particles (particles) having a particle size of 0.425 mm to 2.36 mm and a particle size of 2.36 mm. Particles having a particle size distribution of 5% by mass or less, more preferably particles having a particle size of 0.5 mm to 2.36 mm are 60% by mass or more, and particles having a particle size of more than 2.36 mm. The particle size distribution is 1% by mass or less.
In addition, the value of the said particle size is a value corresponding to the opening size of a sieve.
As aggregate (silica sand) which has the said particle size distribution, it can produce easily by mixing 50 mass parts of commercially available No. 3 silica sand and 50 mass parts of No. 4 silica sand, etc., for example.

骨材の量は、畦を造成する予定の場所(水田)の状況や、畦の造成に使用する土壌に応じて適宜定めればよく、特に限定されるものではない。例えば、畦を造成する対象である地盤から採取される土壌と骨材の合計100質量%中の骨材の割合は、好ましくは1〜50質量%、より好ましくは2〜25質量%、特に好ましくは3〜15質量%である。該割合が1質量%以上であれば、造成された畦の強度をより大きくすることができる。該割合が50質量%以下であれば、材料にかかるコストを低減することができる。   The amount of aggregate may be determined as appropriate according to the situation of the place (paddy field) where the straw is to be created and the soil used for the creation of the straw, and is not particularly limited. For example, the ratio of the aggregate in the total 100 mass% of the soil and aggregate collected from the ground that is the target for constructing the straw is preferably 1 to 50 mass%, more preferably 2 to 25 mass%, particularly preferably. Is 3 to 15% by mass. If this ratio is 1 mass% or more, the intensity | strength of the produced | generated ridge can be enlarged more. If this ratio is 50 mass% or less, the cost concerning material can be reduced.

[畦造成工程]
本工程は、固化材決定工程の後に行われる工程であって、固化材決定工程で定めた固化材の種類及び量で、地盤に畦を造成する工程である。
畦を造成する方法の一例としては、畦の造成に用いる土壌を採掘した後、得られた土壌と固化材決定工程で定めた種類及び量の固化材を混合した後、得られた混合物を、地盤(畦を造成する場所)に運搬した後、混合物を敷き均し、締め固める方法が挙げられる。
畦の造成に用いる土壌は、土壌採取工程において試料を採取した地盤から採掘される土壌である。
採掘手段としては、特に限定されるものではなく、採掘場所と畦を造成する場所の状況に応じて任意の手段を用いればよく、例えば、油圧シャベル、ホイールローダー等が挙げられる。
土壌を採掘した後、該土壌を、畦を造成する場所に運搬する手段の例としては、ダンプカー、ブルトーザー等が挙げられる。
[Making process]
This step is a step that is performed after the solidifying material determination step, and is a step of creating a ridge on the ground with the type and amount of the solidifying material determined in the solidifying material determination step.
As an example of the method of creating a cocoon, after mining the soil used for the production of cocoons, after mixing the obtained soil and the type and amount of solidified material determined in the solidified material determination step, the resulting mixture, After transporting to the ground (place where the cocoons are created), the mixture is spread and leveled and compacted.
The soil used for the construction of the dredging is the soil mined from the ground from which the sample was collected in the soil sampling process.
The mining means is not particularly limited, and any means may be used depending on the situation of the mining place and the place where the dredger is created, and examples thereof include a hydraulic shovel and a wheel loader.
Examples of means for transporting the soil to the place where the straw is created after mining the soil include a dump truck and a bull tozer.

土壌と固化材の混合手段としては、土壌と固化材を均一に混合できるものであれば特に限定されるものではなく、バックホウ、自走式土質改良機等が挙げられる。
なお、畦造成工程において骨材を用いる場合、固化材決定工程で定めた種類及び量の骨材と、上記土壌と、上記固化材を混合する。骨材の混合方法は、特に限定されるものではなく、土壌と固化材と骨材を同時に混合してもよく、土壌と骨材を混合した後に、固化材と混合してもよい。
The means for mixing the soil and the solidified material is not particularly limited as long as the soil and the solidified material can be mixed uniformly, and examples include a backhoe and a self-propelled soil conditioner.
In addition, when using an aggregate in a cocoon formation process, the kind and quantity of aggregate defined in the solidification material determination process, the said soil, and the said solidification material are mixed. The method of mixing the aggregate is not particularly limited, and the soil, the solidified material, and the aggregate may be mixed at the same time, or after mixing the soil and the aggregate, the mixed material may be mixed.

上記混合物を、畦を造成する場所に運搬した後、混合物を敷き均し、締め固めることで、畦を造成することができる。
混合物を敷き均す方法は、特に限定されるものではなく、例えば、バックホウ等が挙げられる。また、自走式土質改良機を用いて各材料を混合することは、混合と敷き均しが同時に実施されるため、より好ましい。
締固めの方法は、造成部分の強度が十分に発現する方法であれば特に限定されるものはなく、例えば、バックホウ、ハンドガイドローラー、ダンパー、またはランマーを用いて転圧する方法が挙げられる。
After transporting the mixture to the place where the cocoons are to be created, the mixture can be spread and leveled and compacted to form the cocoons.
The method of spreading the mixture is not particularly limited, and examples thereof include a backhoe. Moreover, it is more preferable to mix each material using a self-propelled soil improvement machine since mixing and leveling are performed simultaneously.
The compacting method is not particularly limited as long as the strength of the formed portion is sufficiently developed. Examples thereof include a method of rolling using a backhoe, a hand guide roller, a damper, or a rammer.

畦造成工程で造成される畦は、既存の畦の代替物、または、新たに造成される畦である。
既存の畦の代替物の造成方法の一例としては、上幅30cm、高さ30cm、法面勾配1:1の台形を有する既存の畦(標準的な大きさの畦)の上面を、混合物(採掘した土壌と固化材の混合物)で被覆した後、敷き均し、締め固めることで、上幅50cm、高さ100cm、法面勾配1(水平方法):1(高さ方向)の台形を有する新たな畦(既存の畦の代替物)を造成する方法等が挙げられる。上記既存の畦が、長辺500m、短辺100mの長方形の区画を囲むように造成されている場合、新たな畦を造成するためには、1400m程度の土壌が必要である。
また、雑草の生育をより抑制する観点から、既存の畦を混合物で被覆する前に、予め、既存の畦の表面を剥ぎ取ることが好ましい。
The cocoon created in the cocoon production process is an alternative to the existing cocoon or a newly produced cocoon.
As an example of a method for creating an alternative to an existing kite, the upper surface of an existing kite (standard size kite) having a trapezoid with an upper width of 30 cm, a height of 30 cm and a slope of 1: 1 is used as a mixture ( After covering with mined soil and solidified material), it is spread and compacted to have a trapezoid with an upper width of 50 cm, a height of 100 cm, a slope of 1 (horizontal method): 1 (height direction) A method of creating a new kite (an alternative to an existing kite) is included. In the case where the existing fence is constructed so as to surround a rectangular section having a long side of 500 m and a short side of 100 m, soil of about 1400 m 3 is required to create a new fence.
In addition, from the viewpoint of further suppressing the growth of weeds, it is preferable to peel off the surface of the existing straw beforehand before coating the existing straw with the mixture.

以下、本発明を実施例により具体的に説明するが、本発明はこれらの実施例に限定されるものではない。
[使用材料]
(1)土壌;火山灰質粘性土に分類される関東ローム、含水比:125%、湿潤密度:1.35g/cm
(2)固化材A;軽焼酸化マグネシウム粉末(マグネサイトを850℃で焼成して得られた軽焼マグネシアの粉砕物)、ブレーン比表面積:5,500cm/g
(3)固化材B;高炉セメントB種、太平洋セメント社製、ブレーン比表面積3,900cm/g
(4)骨材;セメント強さ試験用標準砂(珪砂)、0.5mm〜2.36mmである粒子の割合:62質量%以上、2.36mmを超える粒子の割合:1質量%以下
EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
[Materials used]
(1) Soil; Kanto Loam classified as volcanic ash clay, moisture content: 125%, wet density: 1.35 g / cm 3
(2) Solidified material A: light-burned magnesium oxide powder (pulverized light-burned magnesia obtained by baking magnesite at 850 ° C.), Blaine specific surface area: 5,500 cm 2 / g
(3) Solidified material B: Blast furnace cement type B, manufactured by Taiheiyo Cement, Blaine specific surface area 3,900 cm 2 / g
(4) Aggregate: Standard sand for cement strength test (silica sand), ratio of particles of 0.5 mm to 2.36 mm: 62 mass% or more, ratio of particles exceeding 2.36 mm: 1 mass% or less

[実施例1〜6、比較例1]
上記土壌と表1に示す種類及び量の材料を使用し、「JGS 0821−2009(安定処理土の締固めをしない供試体作製方法)」に準拠して、供試体を作製した。供試体の作製において、ホバート社製の竪型ミキサに各材料を同時に投入し、10分間混合した後、7日間密封養生した。養生後の供試体について、「JIS A 1216(土の一軸圧縮試験方法)」に準拠して、一軸圧縮強さの測定を行った。
結果を表1に示す。
[Examples 1 to 6, Comparative Example 1]
Using the soil and the materials of the types and amounts shown in Table 1, specimens were produced in accordance with “JGS 0821-2009 (Method for producing specimen without compaction of stabilized soil)”. In the preparation of the specimen, each material was simultaneously put into a vertical mixer manufactured by Hobart, mixed for 10 minutes, and then sealed and cured for 7 days. About the test piece after curing, the uniaxial compressive strength was measured in accordance with “JIS A 1216 (uniaxial compression test method of soil)”.
The results are shown in Table 1.

Figure 2019176755
Figure 2019176755

表1から、実施例1〜6における供試体の一軸圧縮強さは、458kN/m以上であり、雑草の生育を十分に抑制することができる一軸圧縮強さ(300kN/m)より大きいことがわかる。
一方、比較例1(固化材:高炉セメントB種)における供試体の一軸圧縮強さは、250kN/mであり、300kN/mよりも小さいことがわかる。
また、実施例1〜3間の比較、および、実施例4〜6間の比較から、土壌に骨材を添加することで、供試体の一軸圧縮強さがより大きくなることがわかる。
From Table 1, the uniaxial compressive strength of the specimen in Examples 1 to 6, and at 458kN / m 2 or more, greater than the uniaxial compressive strength (300kN / m 2) can be sufficiently suppressed the growth of weeds I understand that.
On the other hand, it can be seen that the uniaxial compressive strength of the specimen in Comparative Example 1 (solidifying material: blast furnace cement type B) is 250 kN / m 2 and smaller than 300 kN / m 2 .
Moreover, it turns out from the comparison between Examples 1-3 and the comparison between Examples 4-6 that the uniaxial compressive strength of a test body becomes larger by adding an aggregate to soil.

Claims (5)

畦の造成に使用する土壌を採掘する地盤から、土壌の試料を採取する土壌採取工程、
上記土壌の試料と、使用予定の固化材を混合して、混合物を得た後、上記混合物について固化後の強度を測定し、得られた測定値に基いて、雑草の生育を抑制するための固化材の種類及び量を定める固化材決定工程、及び、
上記固化材決定工程で定めた固化材の種類及び量で、地盤に畦を造成する畦造成工程、
を含むことを特徴とする畦造成方法。
Soil sampling process for collecting soil samples from the ground where the soil used for the construction of dredging is mined,
After mixing the soil sample and the solidified material to be used to obtain a mixture, the strength after solidification of the mixture is measured, and based on the measured value, the growth of weeds is suppressed. A solidifying material determination step for determining the type and amount of the solidifying material; and
A cocoon formation process for forming cocoons on the ground with the type and amount of the solidification material determined in the solidification material determination process,
A method for producing a cocoon characterized by comprising:
上記固化材が、軽焼酸化マグネシウム粉末である請求項1に記載の畦造成方法。   The method for forming a straw according to claim 1, wherein the solidifying material is light-burned magnesium oxide powder. 上記固化材決定工程及び上記畦造成工程において、上記土壌の試料及び上記固化材に加えて、骨材を用いる請求項1又は2に記載の畦造成方法。   The cocoon formation method according to claim 1 or 2, wherein aggregate is used in addition to the soil sample and the solidification material in the solidification material determination step and the cocoon formation step. 上記固化材決定工程における上記固化後の強度が、一軸圧縮強さ、または、土壌硬度計を用いて得られる硬度である請求項1〜3のいずれか1項に記載の畦造成方法。   The cocoon formation method according to any one of claims 1 to 3, wherein the strength after the solidification in the solidifying material determination step is a uniaxial compressive strength or a hardness obtained using a soil hardness meter. 上記畦造成工程で造成される畦が、既存の畦の代替物、または、新たに造成される畦である請求項1〜4のいずれか1項に記載の畦造成方法。   The cocoon forming method according to any one of claims 1 to 4, wherein the cocoon produced in the cocoon production process is a substitute for an existing cocoon or a newly produced cocoon.
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