JP2018178672A - Ground improvement method - Google Patents
Ground improvement method Download PDFInfo
- Publication number
- JP2018178672A JP2018178672A JP2017084591A JP2017084591A JP2018178672A JP 2018178672 A JP2018178672 A JP 2018178672A JP 2017084591 A JP2017084591 A JP 2017084591A JP 2017084591 A JP2017084591 A JP 2017084591A JP 2018178672 A JP2018178672 A JP 2018178672A
- Authority
- JP
- Japan
- Prior art keywords
- mass
- soil
- hydraulic powder
- less
- ground improvement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
本発明は、地盤の改良工法、地盤改良体、地盤改良用スラリー、及び地盤改良用粉末固化材組成物に関する。 The present invention relates to a ground improvement method, a ground improvement body, a slurry for ground improvement, and a powder solidified material composition for ground improvement.
建造物を建設する基礎を地盤改良する方法として、コンクリート製又は鋼管製の地盤改良コラムを地盤に打ち込む地盤改良方法や、地盤を掘削しながらセメントミルクなどのセメント系固化材を注入し、掘削土と前記セメントミルクとが混じり合って形成されるコラム状の地盤改良体を地盤中に直接形成する地盤改良方法が知られている。後者のセメントミルクを用いる方法では、地盤改良体の強度や固化に要する時間が重要であることから、そのための技術が従来種々提案されている。
特許文献１には、セメント系凝結遅延剤と、トリエタノールアミン、ジエタノールアミン、モノエタノールアミンから選ばれた１種または２種以上の化合物からなるセメント系硬化促進剤とを配合した地盤改良用配合剤が開示されている。
特許文献２には、トリエタノールアミン、炭酸ナトリウム及び炭酸カリウムを含む、地下の鉱坑設備に使用するのに適したセメントの硬化を促進する促進剤が開示されている。
特許文献３には、（ｉ）スラグ、（ii）アルカリ金属水酸化物及び（iii）水酸化カルシウム、水酸化カルシウム形成性カルシウム化合物及びトリエタノールアミンの中から選ばれる少なくとも１種の添加剤を含有する混合物からなる土壌改良剤が開示されている。
As a method of ground improvement of the foundation to construct a structure, a ground improvement method in which a ground improvement column made of concrete or steel pipe is driven into the ground or a cement-based solidifying material such as cement milk is injected while excavating the ground There is known a ground improvement method in which a column-shaped ground improvement formed by mixing the above and the cement milk is formed directly in the ground. In the latter method using cement milk, since the time required for the strength and solidification of the ground improvement body is important, various techniques for this have been proposed.
Patent Document 1 discloses a ground improvement compounding agent comprising a cement-based setting retarder and a cement-based hardening accelerator comprising one or more compounds selected from triethanolamine, diethanolamine, and monoethanolamine. Is disclosed.
U.S. Pat. No. 5,959,095 discloses an accelerator for promoting cement hardening suitable for use in underground mining equipment, including triethanolamine, sodium carbonate and potassium carbonate.
Patent Document 3 includes at least one additive selected from (i) slag, (ii) alkali metal hydroxide and (iii) calcium hydroxide, calcium hydroxide-forming calcium compound, and triethanolamine. A soil conditioner comprising the mixture contained is disclosed.
しかしながら、土壌が含む粘土の組成により、添加する薬剤に期待された強度向上効果が発現しないことがあることが判明した。
本発明は、土壌が含む粘土の組成に関わらず地盤改良体の強度、例えば７日程度の初期強度と２８日程度の長期強度とを向上できる地盤の改良方法を提供する。
However, it was found that the composition of clay contained in the soil may not exert the strength improvement effect expected for the added agent.
The present invention provides a ground improvement method capable of improving the strength of the ground improvement body, for example, the initial strength of about 7 days and the long-term strength of about 28 days regardless of the composition of clay contained in the soil.
本発明は、土壌に、水硬性粉体と、トリエタノールアミン又はその塩とを混合する地盤の改良工法であって、
土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、
水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有する、
地盤の改良工法に関する。
The present invention is an improvement method of ground in which hydraulic powder and triethanolamine or a salt thereof are mixed with soil,
The soil is a soil in which the proportion of fine particles having a particle size of 0.074 mm or less is 50% by mass or more,
The hydraulic powder contains 5% by mass or more and 15% by mass or less of anhydrous gypsum,
It relates to the improvement method of the ground.
また、本発明は、土壌、水硬性粉体、及びトリエタノールアミン又はその塩を含有する地盤改良体であって、
土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、
水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有する、
地盤改良体に関する。
The present invention is also a ground improvement body comprising soil, hydraulic powder, and triethanolamine or a salt thereof,
The soil is a soil in which the proportion of fine particles having a particle size of 0.074 mm or less is 50% by mass or more,
The hydraulic powder contains 5% by mass or more and 15% by mass or less of anhydrous gypsum,
It relates to the ground improvement body.
また、本発明は、水、水硬性粉体、及びトリエタノールアミン又はその塩を含有するスラリーと土壌との混合物を硬化させてなる地盤改良体であって、
土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、
水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有する、
地盤改良体に関する。
In addition, the present invention is a ground improvement body obtained by curing a mixture of a slurry containing water, hydraulic powder, and triethanolamine or a salt thereof, and the soil,
The soil is a soil in which the proportion of fine particles having a particle size of 0.074 mm or less is 50% by mass or more,
The hydraulic powder contains 5% by mass or more and 15% by mass or less of anhydrous gypsum,
It relates to the ground improvement body.
また、水、水硬性粉体、及びトリエタノールアミン又はその塩を含有する地盤改良用スラリーであって、水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有し、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌に用いられる、地盤改良用スラリーに関する。 Further, it is a slurry for ground improvement containing water, hydraulic powder, and triethanolamine or a salt thereof, wherein the hydraulic powder contains 5% by mass or more and 15% by mass or less of anhydrous gypsum, and has a particle diameter of 0 The present invention relates to a slurry for ground improvement, which is used for soil having a fine particle fraction of 50% by mass or more.
また、本発明は、水硬性粉体、及びトリエタノールアミン又はその塩を含有する地盤改良用粉末固化材組成物であって、水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有し、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌に用いられる、地盤改良用粉末固化材組成物に関する。 Further, the present invention is a powder solidifying material composition for ground improvement containing hydraulic powder and triethanolamine or a salt thereof, wherein the hydraulic powder contains 5% by mass to 15% by mass of anhydrous gypsum. The present invention relates to a powdery solidifying material composition for ground improvement, which is used in soil containing 50% by mass or more of fine particles having a particle size of 0.074 mm or less.
本発明によれば、土壌が含む粘土の組成に関わらず地盤改良体の強度、例えば７日程度の初期強度と２８日程度の長期強度とを向上できる地盤の改良方法が提供される。そのため、土壌に対する汎用性が高い。
セメント系固化材による地盤改良は、ＪＩＳで規定された製品（セメント、粗骨材、細骨材等）を用い硬化するコンクリートと違い、自然に存在する多種多様な土を固化するものである。ゆえに、地域、土質性状（含水比、粒度等）により強度発現効果が全く異なる。本発明は、土壌が含む粘土の組成に関わらず地盤改良体の強度、例えば７日程度の初期強度と２８日程度の長期強度とを向上できる地盤の改良方法を提供する。
According to the present invention, there is provided a ground improvement method capable of improving the strength of the ground improvement body, for example, the initial strength of about 7 days and the long-term strength of about 28 days regardless of the composition of clay contained in the soil. Therefore, the versatility to the soil is high.
Ground improvement by cement-based solidifying material solidifies a wide variety of naturally existing soils unlike concrete which is hardened using a product (cement, coarse aggregate, fine aggregate, etc.) defined in JIS. Therefore, the strength development effect is completely different depending on the area and soil properties (water content ratio, particle size, etc.). The present invention provides a ground improvement method capable of improving the strength of the ground improvement body, for example, the initial strength of about 7 days and the long-term strength of about 28 days regardless of the composition of clay contained in the soil.
〔地盤の改良工法〕
水硬性粉体は、水和反応により硬化する物性を有する粉体のことであり、セメント、石膏等が挙げられる。
本発明では、土壌が含む粘土の組成に関わらず地盤改良体が高い強度を発現する観点から、水硬性粉体は、無水石膏を５質量％以上１５質量％以下含有する。水硬性粉体は、無水石膏を、好ましくは６質量％以上、より好ましくは８質量％以上、そして、好ましくは１２質量％以下、より好ましくは１０質量％以下含有する。無水石膏は、結晶水を持たない硫酸カルシウムであり、例えば、可溶性無水石膏（III型無水石膏）と不溶性無水石膏（II型無水石膏）とがある。本発明では、これらのいずれを用いてもよい。
[Improvement method of ground]
The hydraulic powder is a powder having physical properties that hardens by hydration reaction, and examples thereof include cement and gypsum.
In the present invention, the hydraulic powder contains 5% by mass or more and 15% by mass or less of anhydrous gypsum from the viewpoint that the ground improvement body develops high strength regardless of the composition of the clay contained in the soil. The hydraulic powder preferably contains anhydrous gypsum in an amount of 6% by mass or more, more preferably 8% by mass or more, and preferably 12% by mass or less, more preferably 10% by mass or less. Anhydrite is calcium sulfate without water of crystallization, and there are, for example, soluble anhydrite (type III anhydrite) and insoluble anhydrite (type II anhydrite). Any of these may be used in the present invention.
水硬性粉体は、セメントを含有することが好ましい。セメントは、例えば、普通ポルトランドセメント等のポルトランドセメント、ビーライトセメント、中庸熱セメント、早強セメント、超早強セメント、耐硫酸塩セメント等のセメントである。水硬性粉体は、セメント、更にポルトランドセメントを、好ましくは２５質量％以上、より好ましくは３５質量％以上、更に好ましくは５０質量％以上、より更に好ましくは６０質量％以上、より更に好ましくは７０質量％以上、そして、好ましくは９５質量％以下、より好ましくは９２質量％以下、更に好ましくは９０質量％以下、より更に好ましくは８５質量％以下含有する。
また、水硬性粉体は、高炉スラグ、フライアッシュ、シリカフュームなどのポゾラン作用及び／又は潜在水硬性を有する粉体や、石粉（炭酸カルシウム粉末）を含有することができる。セメントに、これらが添加された高炉スラグセメント、フライアッシュセメント、シリカフュームセメント等でもよい。水硬性粉体は、水和生成物であるエトリンガイトのアルミニウムイオン供給源の観点から、高炉スラグを含有することが好ましい。水硬性粉体が高炉スラグを含有する場合、その含有量は、水硬性粉体中、好ましくは１０質量％以上、より好ましくは１５質量％以上、そして、好ましくは６０質量％以下、より好ましくは５０質量％未満である。
水硬性粉体は、無水石膏、及びポルトランドセメントを含む水硬性粉体が好ましい。また、水硬性粉体は、無水石膏、ポルトランドセメント、及び高炉スラグを含む水硬性粉体もまた好ましい。
The hydraulic powder preferably contains cement. The cement is, for example, Portland cement such as ordinary Portland cement, belite cement, medium heat cement, early strength cement, ultra early strength cement, sulfate resistant cement, etc. The hydraulic powder preferably comprises 25% by mass or more, more preferably 35% by mass or more, still more preferably 50% by mass or more, still more preferably 60% by mass or more, still more preferably 70% by mass of cement and further portland cement. It is contained by mass% or more, preferably 95% by mass or less, more preferably 92% by mass or less, still more preferably 90% by mass or less, still more preferably 85% by mass or less.
The hydraulic powder may contain powder having pozzolanic action and / or latent hydraulic property such as blast furnace slag, fly ash, silica fume, and stone powder (calcium carbonate powder). The cement may be blast furnace slag cement, fly ash cement, silica fume cement or the like to which these are added. The hydraulic powder preferably contains blast-furnace slag from the viewpoint of the aluminum ion source of ettringite which is a hydration product. When the hydraulic powder contains blast furnace slag, the content thereof in the hydraulic powder is preferably 10% by mass or more, more preferably 15% by mass or more, and preferably 60% by mass or less, more preferably It is less than 50% by mass.
The hydraulic powder is preferably a hydraulic powder containing anhydrous gypsum and portland cement. The hydraulic powder is also preferably a hydraulic powder comprising anhydrous gypsum, Portland cement, and blast furnace slag.
なお、本発明では、水硬性粉体の量は、水和反応により硬化する物性を有する粉体の量、例えばセメントと無水石膏の量であるが、水硬性粉体が、ポゾラン作用を有する粉体、潜在水硬性を有する粉体、及び石粉（炭酸カルシウム粉末）から選ばれる粉体を含む場合、本発明では、それらの量も水硬性粉体の量に算入する。 In the present invention, the amount of hydraulic powder is the amount of powder having physical properties to be hardened by hydration reaction, for example, the amount of cement and anhydrite, but the powder having hydraulic action has pozzolanic action. When a powder selected from a body, a latent hydraulic powder and a stone powder (calcium carbonate powder) is included, in the present invention, those amounts are also included in the amount of hydraulic powder.
本発明では、トリエタノールアミン又はその塩を用いる。トリエタノールアミンは、塩、例えば塩酸塩などの無機酸による塩の形態で土壌に混合してもよい。トリエタノールアミンの塩の場合、量は、トリエタノールアミン換算の量を採用する。トリエタノールアミン塩、なかでも無機酸による塩は、通常、粉末品であることから、水硬性粉体とドライブレンドできる観点で好ましい。 In the present invention, triethanolamine or a salt thereof is used. Triethanolamine may be mixed into the soil in the form of a salt, for example a salt with a mineral acid such as hydrochloride. In the case of the salt of triethanolamine, the amount adopts the amount of triethanolamine conversion. Since a triethanolamine salt, particularly a salt with an inorganic acid, is usually a powdery product, it is preferable from the viewpoint of being dry-blended with a hydraulic powder.
本発明の対象となる土壌は、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌である。地盤材料としての土の分類基準は、地盤工学会基準（公益社団法人地盤工学会、２００９）としてまとめられている。それによると、粒径０．００５ｍｍ以上０．０７４ｍｍ以下の粒子はシルト、粒径０．００５ｍｍ未満の粒子は粘土に分類される。これらの細粒分は、土壌に粘性を与える成分である。また、前記地盤工学会基準によれば、粒径０．０７４ｍｍ以下の細粒分の割合が、５０質量％以上の土壌として、粘性土、有機質土、火山灰質粘性土が知られている。本発明では、このような土壌を対象とすることができる。本発明の対象となる土壌の一例として、粒径０．０７４ｍｍ以下の細粒分の割合が、好ましくは５０質量％を超える、より好ましくは６０質量％以上、より好ましくは７０質量％以上、そして、好ましくは１００質量％以下の土壌が挙げられる。 The soil to which the present invention is applied is soil in which the proportion of fine particles having a particle size of 0.074 mm or less is 50% by mass or more. Classification criteria of soil as ground material are summarized as the Geotechnical Engineering Association Standard (National Institute of Geotechnical Engineering, 2009). According to it, particles with a particle diameter of 0.005 mm or more and 0.074 mm or less are classified as silt, and particles with a particle diameter of less than 0.005 mm are classified into clay. These fine particles are components that impart viscosity to the soil. Moreover, according to the said Geotechnical Society standards, a viscous soil, an organic soil, and a volcanic ash cohesive soil are known as a soil having a ratio of fine particles having a particle size of 0.074 mm or less of 50% by mass or more. In the present invention, such soil can be targeted. As an example of the soil to which the present invention is applied, the proportion of fine particles having a particle size of 0.074 mm or less is preferably more than 50% by mass, more preferably 60% by mass or more, more preferably 70% by mass or more Preferably the soil of 100 mass% or less is mentioned.
粘土は、層状構造をもった含水珪酸塩鉱物（以降、粘土鉱物と呼ぶ）を主体としたものであり、この粘土中に微粒の鉱物として含まれる粘土鉱物としては、カオリン（カオリナイト、ディッカイト、ナクライトなど）、蛇紋石（リザーダイト、アンチゴライト、クリソタイルなど）、雲母粘土鉱物（イライト、セリサイト、海緑石、セラドナイトなど）、クロライト、バーミキュライト、スメクタイト（モンモリロナイト、バイデライト、ノントロナイト、サポナイト、ヘクトライトなど）などが挙げられる。土壌が含む粘土の種類、量などは多様であるが、本発明では、例えば、カオリン及びスメクタイトから選ばれる粘土鉱物を含む土壌を対象とすることができる。 Clay is mainly composed of hydrous silicate mineral having a layered structure (hereinafter referred to as clay mineral), and kaolin (kaolinite, dickite, Nacreite etc.), serpentine (Lizadite, antigorite, chrysotile etc.), mica clay mineral (Illite, sericite, sea green stone, celadnite etc.), chlorite, vermiculite, smectite (montmorillonite, beidellite, nontronite, saponite) , Hectorite, etc.). Although the type, amount, and the like of clay contained in the soil vary, the present invention can be directed to, for example, soil containing a clay mineral selected from kaolin and smectite.
火山灰質粘性土を含む土壌を固化材により固化処理すると、他の粘性土に比べて強度発現が劣ることが多い。この理由として、火山灰質粘性土に多量に含まれる非晶質の珪酸アルミニウム粘土鉱物のアロフェンが、固化材から生じるカルシウムイオンを多量に取り込むことで、エトリンガイトの生成量が少なくなり、強度が低下するものと思われる。したがって、含水比の多い粘土、さらにはアロフェンを含む粘土であっても効果が発現することは重要である。本発明では、トリエタノールアミンを用い、且つ無水石膏を含む水硬性粉体を用いることで、含水比の多い粘土、さらにはアロフェンを含む粘土であってもエトリンガイトの生成量が維持され、強度を向上できるものと推察される。 When the soil containing the volcanic ash soil is solidified with a solidifying agent, the strength development is often inferior to that of other viscous soils. The reason for this is that the amorphous aluminum silicate clay mineral Allophane, which is contained in a large amount in the volcanic clay soil, incorporates a large amount of calcium ions generated from the solidified material, thereby reducing the formation of ettringite and decreasing the strength. It seems to be. Therefore, it is important that the effects appear even in clays having a high water content ratio, and even clays containing allophane. In the present invention, by using triethanolamine and hydraulic powder containing anhydrite, the formation of ettringite is maintained even with clay having a high water content ratio, and even clay containing allophane, and the strength is It is surmised that it can improve.
本発明の地盤の改良工法では、地盤改良体の強度発現性の観点から、土壌に、水硬性粉体を、水硬性粉体／土壌の質量比が、好ましくは０．０１以上、より好ましくは０．０５以上、更に好ましくは０．１以上、そして、経済性の観点から、好ましくは１．０以下、より好ましくは０．９以下、更に好ましくは０．８以下で混合する。 In the ground improvement method of the present invention, from the viewpoint of strength development of the ground improvement body, the hydraulic powder and the hydraulic powder / soil mass ratio are preferably 0.01 or more, and more preferably soil. The mixing is preferably performed at 0.05 or more, more preferably 0.1 or more, and preferably 1.0 or less, more preferably 0.9 or less, and still more preferably 0.8 or less from the viewpoint of economy.
また、本発明の地盤の改良工法では、地盤改良体の強度発現の観点から、トリエタノールアミン又はその塩を、水硬性粉体に対して、好ましくは０．０１質量％以上、より好ましくは０．０５質量％以上、更に好ましくは０．１質量％以上、そして、経済性の観点から、好ましくは２．０質量％以下、より好ましくは１．５質量％以下、更に好ましくは１．０質量％以下で混合する。 Further, in the ground improvement method of the present invention, from the viewpoint of strength development of the ground improvement body, triethanolamine or a salt thereof is preferably 0.01% by mass or more, more preferably 0 based on the hydraulic powder. .05 mass% or more, more preferably 0.1 mass% or more, and from the viewpoint of economy, preferably 2.0 mass% or less, more preferably 1.5 mass% or less, still more preferably 1.0 mass Mix below%.
本発明の地盤改良工法は、海水を含んだ土壌や海成粘性土の地盤改良にも使用できる。 The ground improvement method of the present invention can also be used for ground improvement of soil containing sea water or marine cohesive soil.
本発明の地盤の改良工法は、表層改良工法、深層改良工法、鋼管杭工法、シールド工法などの工法に適用できる。例えば、深層改良工法では、高圧噴射工法、ＴＲＤ工法、ＳＭＷ工法などに適用できる。 The ground improvement method of the present invention can be applied to methods such as a surface layer improvement method, a deep layer improvement method, a steel pipe pile method, and a shield method. For example, the deep layer improvement method can be applied to the high pressure injection method, the TRD method, the SMW method, and the like.
本発明の地盤改良工法では、水硬性粉体とトリエタノールアミン又はその塩とを、下記（Ｉ）及び（II）のいずれかの方法で土壌と混合することが好ましい。地盤改良体の均一性の観点から、方法（Ｉ）が好ましい。方法（Ｉ）、（II）の何れにおいても、土壌は細粒分を所定量含む土壌であり、水硬性粉体は無水石膏を５質量％以上１５質量％以下含有する。
＜方法（Ｉ）＞
水と、水硬性粉体と、トリエタノールアミン又はその塩とを含有し、水／水硬性粉体の質量比が０．５以上１．５以下であるスラリーを、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌と混合する方法。
＜方法（II）＞
水硬性粉体と、トリエタノールアミン又はその塩とを、それぞれ、粉体で粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌と混合する方法。
以下、方法（Ｉ）と（II）について説明する。
In the ground improvement method of the present invention, it is preferable to mix hydraulic powder and triethanolamine or a salt thereof with soil by any of the following methods (I) and (II). From the viewpoint of the uniformity of the ground improvement body, the method (I) is preferred. In any of the methods (I) and (II), the soil is a soil containing a predetermined amount of fine particles, and the hydraulic powder contains 5% by mass to 15% by mass of anhydrous gypsum.
<Method (I)>
A slurry containing water, hydraulic powder, triethanolamine or a salt thereof, and having a water / hydraulic powder mass ratio of 0.5 to 1.5, has a particle diameter of 0.074 mm or less Method of mixing with soil with a proportion of fine particles of 50% by mass or more.
<Method (II)>
A method of mixing a hydraulic powder and triethanolamine or a salt thereof with soil each having a ratio of fine particles having a particle size of 0.074 mm or less and having 50% by mass or more.
Hereinafter, methods (I) and (II) will be described.
＜方法（Ｉ）＞
方法（Ｉ）では、土壌１ｍ３あたりのスラリーの混合量が１００ｋｇ以上８００ｋｇ以下であることが好ましい。
また、方法（Ｉ）では、スラリー中の水硬性粉体／土壌の質量比が０．０１以上１．０以下であることが好ましい。
また、方法（Ｉ）では、スラリーの調製に用いる水は、真水、海水の何れも用いることが出来る。スラリーの水の少なくとも一部が海水であってもよい。
<Method (I)>
In the method (I), the mixing amount of the slurry per 1 m 3 of soil is preferably 100 kg or more and 800 kg or less.
Moreover, in method (I), it is preferable that mass ratio of hydraulic powder / soil in a slurry is 0.01 or more and 1.0 or less.
In the method (I), either fresh water or seawater can be used as water used to prepare the slurry. At least a portion of the water of the slurry may be seawater.
水と水硬性粉体とトリエタノールアミン又はその塩を混合してスラリーを調製する具体的な方法は、セメントミルクなどの水硬性組成物を調製する公知の方法に準じてよい。 A specific method of preparing a slurry by mixing water, hydraulic powder and triethanolamine or a salt thereof may be in accordance with a known method of preparing a hydraulic composition such as cement milk.
方法（Ｉ）では、セメントミルクと地盤との混合性の観点から、スラリーにおける水／水硬性粉体の質量比は、０．５以上、好ましくは０．６以上、より好ましくは０．８以上、そして、地盤改良体の強度発現性の観点から、１．５以下、好ましくは１．２以下、より好ましくは１．０以下である。 In the method (I), the mass ratio of water / hydraulic powder in the slurry is 0.5 or more, preferably 0.6 or more, more preferably 0.8 or more from the viewpoint of the mixing property of cement milk and the ground. And, from the viewpoint of strength development of the ground improvement body, it is 1.5 or less, preferably 1.2 or less, more preferably 1.0 or less.
スラリーを地盤に注入する具体的な方法は、公知の地盤改良方法に準じてよい。
スラリーを地盤に注入する方法として、例えば、噴射撹拌工法（一相流方式、二相流方式、三相流方式）や機械撹拌工法（ＣＤＭ工法など）、さらに地中連続壁工法（ＳＭＷ工法、ＴＲＤ工法など）などが挙げられる。さらに水硬性粉体にトリエタノールアミンをドライブレンドした系では、粉体混合方式のＤＪＭ（Ｄｒｙ Ｊｅｔ Ｍｉｘｉｎｇ）工法やスタビライザなどを使用した浅層改良などにも使用できる。
The specific method of injecting the slurry into the ground may be according to a known ground improvement method.
As a method of injecting the slurry into the ground, for example, a jet agitation method (one phase flow method, two phase flow method, three phase flow method) or a mechanical agitation method (CDM method etc.), and a continuous underground wall method (SMW method, TRD method etc.). Furthermore, in a system in which triethanolamine is dry-blended with hydraulic powder, it can be used also for shallow layer improvement using a powder mixing method DJM (Dry Jet Mixing) method or a stabilizer.
方法（Ｉ）では、地盤改良体の強度発現性の観点から、土壌１ｍ３あたりのスラリーの混合量が好ましくは１００ｋｇ以上、より好ましくは１５０ｋｇ以上、更に好ましくは２００ｋｇ以上、そして、スラリーと置換される排泥量の低減の観点から、好ましくは８００ｋｇ以下、より好ましくは７００ｋｇ以下、更に好ましくは６００ｋｇ以下である。 In the method (I), the amount of the slurry mixed per 1 m 3 of soil is preferably 100 kg or more, more preferably 150 kg or more, still more preferably 200 kg or more, from the viewpoint of strength development of the ground improvement body From the viewpoint of reducing the amount of sludge, it is preferably 800 kg or less, more preferably 700 kg or less, and still more preferably 600 kg or less.
スラリーと土壌の混合物は、公知の地盤改良方法に準じて固化させる。 The mixture of slurry and soil is solidified according to known ground improvement methods.
方法（Ｉ）のより具体的な例として、下記の工程１〜３を有する地盤の改良工法が挙げられる。この方法でも、土壌は細粒分を所定量含む土壌であり、水硬性粉体は無水石膏を５質量％以上１５質量％以下含有する。
＜工程１＞
水と、水硬性粉体と、トリエタノールアミン又はその塩とを混合してスラリーを調製する工程であって、水と水硬性粉体とを、水／水硬性粉体の質量比が０．５以上１．５以下で混合し、水硬性粉体とトリエタノールアミン又はその塩とを、水硬性粉体の含有量に対するトリエタノールアミン又はその塩の割合が０．０１質量％以上２．０質量％以下で混合する工程
＜工程２＞
工程１で得られたスラリーを地盤に注入してスラリーと土壌とを混合して混合物を得る工程であって、土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、土壌１ｍ３あたりのスラリーの混合量が１００ｋｇ以上８００ｋｇ以下であり、スラリー中の水硬性粉体／土壌の質量比が０．０１以上１．０以下である工程
＜工程３＞
工程２で得られたスラリーと土壌の混合物を固化させる工程
As a more specific example of the method (I), the ground improvement method having the following steps 1 to 3 can be mentioned. Also in this method, the soil is a soil containing a predetermined amount of fine particles, and the hydraulic powder contains 5% by mass to 15% by mass of anhydrous gypsum.
<Step 1>
A step of preparing a slurry by mixing water, hydraulic powder and triethanolamine or a salt thereof, wherein water and hydraulic powder have a weight ratio of water / hydraulic powder of 0. It mixes in 5 or more and 1.5 or less, and the ratio of triethanolamine or its salt with respect to the content of hydraulic powder and triethanolamine or its salt is 0.01 mass% or more and 2.0 or more Process to mix by mass% or less <process 2>
The step of injecting the slurry obtained in step 1 into the ground and mixing the slurry and the soil to obtain a mixture, wherein the proportion of the fine particles having a particle size of 0.074 mm or less is 50% by mass or more Process that is soil, and the mixing amount of slurry per 1 m 3 of soil is 100 kg or more and 800 kg or less, and the mass ratio of hydraulic powder / soil in the slurry is 0.01 or more and 1.0 or less <Step 3>
Solidifying the mixture of slurry and soil obtained in step 2
＜方法（II）＞
方法（II）では、水硬性粉体と、トリエタノールアミンとを、それぞれ、粉体で粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌と混合する。水硬性粉体の粉体とトリエタノールアミンの粉体は、別々に土壌と混合してもよいし、予め両者を混合した粉体混合物として土壌と混合してもよい。予め両者を混合した粉体混合物は、水硬性粉体の含有量に対するトリエタノールアミンの含有量が０．０１質量％以上２．０質量％以下であることが好ましく、これは、本発明の地盤改良用粉末固化材組成物である。前記粉体混合物は、水硬性粉体／土壌の質量比が０．０１以上１．０以下で土壌と混合して用いられることが好ましい。
<Method (II)>
In the method (II), the hydraulic powder and triethanolamine are each mixed with the soil in a proportion of 50% by mass or more of fine powder having a particle size of 0.074 mm or less. The powder of hydraulic powder and the powder of triethanolamine may be separately mixed with the soil, or may be mixed with the soil as a powder mixture in which both are mixed beforehand. It is preferable that the content of triethanolamine with respect to the content of hydraulic powder is 0.01% by mass or more and 2.0% by mass or less with respect to the content of the hydraulic powder in the powder mixture in which both are mixed in advance. It is a powder solidifying material composition for improvement. The powder mixture is preferably mixed with soil at a hydraulic powder / soil mass ratio of 0.01 or more and 1.0 or less.
方法（II）は、例えば、土壌に、敷き均し又はかき起こしなどの処置を行った後、土壌に水硬性粉体と粉体のトリエタノールアミンとを所定量散布し、スタビライザなどの混合機械によって、土壌と、水硬性粉体及びトリエタノールアミンとを混合する転圧する方式で行うことができる。また、方法（II）は、改良しようとする地盤に、外部の土壌を搬入して敷き均した後、この土壌に水硬性粉体と粉体のトリエタノールアミンとを散布する、いわゆる原位置混合方式で行うこともできる。また、方法（II）は、事前に土取り場等で土壌と水硬性粉体と粉体のトリエタノールアミンとを混合した後、これを改良しようとする地盤に搬入する、いわゆる事前混合方式で行うこともできる。いずれの方法でも、土壌と、水硬性粉体及び粉体のトリエタノールアミンとの混合は、公知の方法で行うことができる。 Method (II) is, for example, after soil treatment such as spreading or scraping, a predetermined amount of hydraulic powder and triethanolamine powder is sprayed on the soil, and a mixing machine such as a stabilizer It can be carried out in a compacting mode in which the soil is mixed with hydraulic powder and triethanolamine. In addition, method (II) is a so-called in-situ mixing in which an external soil is carried in and spread on the ground to be improved, and then hydraulic powder and triethanolamine powder are dispersed in this soil. It can also be done by the method. In addition, method (II) is a so-called pre-mixing method in which the soil, hydraulic powder and triethanolamine triethanolamine are mixed in advance in an earth removal place and carried into the ground to be improved. It can also be done. In any of the methods, mixing of the soil with hydraulic powder and triethanolamine of powder can be carried out by a known method.
本発明の地盤の改良工法として、土壌に、水硬性粉体と、トリエタノールアミン又はその塩とを混合する地盤の改良工法であって、
土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、
水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有し、
水硬性粉体を、水硬性粉体／土壌の質量比が０．０１以上１．０以下で混合し、
トリエタノールアミン又はその塩を、水硬性粉体に対して０．０１質量％以上２．０質量％以下で混合する、
地盤の改良工法が挙げられる。
The ground improvement method according to the present invention is a ground improvement method in which hydraulic powder and triethanolamine or a salt thereof are mixed with the soil,
The soil is a soil in which the proportion of fine particles having a particle size of 0.074 mm or less is 50% by mass or more,
The hydraulic powder contains 5% by mass or more and 15% by mass or less of anhydrous gypsum,
Mix hydraulic powder at a hydraulic powder / soil mass ratio of 0.01 or more and 1.0 or less,
Mixing triethanolamine or a salt thereof in an amount of 0.01% by mass or more and 2.0% by mass or less with respect to the hydraulic powder;
The improvement method of the ground is mentioned.
〔地盤改良体〕
本発明の地盤改良体は、土壌、水硬性粉体、及びトリエタノールアミン又はその塩を含有する地盤改良体であって、土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有する、地盤改良体である。この地盤改良体は、水硬性粉体の含有量に対するトリエタノールアミン又はその塩の含有量が０．０１質量％以上２．０質量％以下であることが好ましい。
この地盤改良体は、前記土壌と、水と、無水石膏を所定量含有する水硬性粉体と、トリエタノールアミンとを含有するスラリーを硬化させてなる地盤改良体であってよい。従って、本発明は、水、水硬性粉体、及びトリエタノールアミン又はその塩を含有するスラリーと土壌との混合物を硬化させてなる地盤改良体であって、土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有する、地盤改良体もまた提供する。前記スラリーは、水／水硬性粉体の質量比が０．５以上１．５以下であることが好ましい。また、前記スラリーは、水硬性粉体の含有量に対するトリエタノールアミン又はその塩の含有量が０．０１質量％以上２．０質量％以下であることが好ましい。また、この地盤改良体では、土壌１ｍ３あたりの前記スラリーの混合量が１００ｋｇ以上８００ｋｇ以下であることが好ましい。また、この地盤改良体では、前記混合物は、水硬性粉体／土壌の質量比が０．０１以上１．０以下であることが好ましい。
[Ground improvement body]
The ground improvement body of the present invention is a ground improvement body containing soil, hydraulic powder, and triethanolamine or a salt thereof, wherein the proportion of the fine particles having a particle size of 0.074 mm or less is 50 mass. %, And the hydraulic powder is a ground improvement body containing 5% by mass or more and 15% by mass or less of anhydrous gypsum. It is preferable that this ground improvement body is 0.01 mass% or more and 2.0 mass% or less of content of triethanolamine or its salt with respect to content of hydraulic powder.
The ground improvement body may be a ground improvement body obtained by curing a slurry containing the soil, water, hydraulic powder containing a predetermined amount of anhydrous gypsum, and triethanolamine. Therefore, the present invention is a ground improvement body formed by curing a mixture of water, hydraulic powder, and a slurry containing triethanolamine or a salt thereof with soil, wherein the soil has a particle diameter of 0.074 mm or less A ground improvement body is also provided, in which the proportion of fine particles in the soil is 50% by mass or more, and the hydraulic powder contains 5% by mass or more and 15% by mass or less of anhydrous gypsum. The slurry preferably has a water / hydraulic powder mass ratio of 0.5 or more and 1.5 or less. Moreover, it is preferable that content of the triethanolamine or its salt with respect to content of hydraulic powder is 0.01 mass% or more and 2.0 mass% or less of the said slurry. Further, in this soil improvement material, it is preferable mixing amount of the slurry per soil 1 m 3 is equal to or less than 800kg or 100 kg. Moreover, in this ground improvement body, it is preferable that the said mixture has a mass ratio of hydraulic powder / soil of 0.01 or more and 1.0 or less.
本発明の地盤の改良工法で述べた事項は、本発明の地盤改良体に適宜適用することができる。
本発明の地盤改良体における、水硬性粉体、トリエタノールアミンの具体例、好ましい態様や、各質量比、質量％などの量的な規定も、本発明の地盤の改良工法と同じである。
The matters described in the ground improvement method of the present invention can be appropriately applied to the ground improvement body of the present invention.
Specific examples of hydraulic powder and triethanolamine in the ground improvement body of the present invention, preferred embodiments, and quantitative specifications such as mass ratios and mass% are the same as the ground improvement construction method of the present invention.
本発明の地盤改良体として、土壌、水硬性粉体、及びトリエタノールアミン又はその塩を含有し、土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有し、水硬性粉体／土壌の質量比が０．０１以上１．０以下であり、水硬性粉体の含有量に対するトリエタノールアミン又はその塩の含有量が０．０１質量％以上２．０質量％以下である、地盤改良体が挙げられる。 The soil improvement body of the present invention includes soil, hydraulic powder, and triethanolamine or a salt thereof, and the soil is a soil having a proportion of fine particles having a particle size of 0.074 mm or less at 50% by mass or more. The hydraulic powder contains 5% by mass to 15% by mass of anhydrous gypsum, and the mass ratio of hydraulic powder / soil is 0.01 or more and 1.0 or less, relative to the content of the hydraulic powder The ground improvement object whose content of triethanolamine or its salt is 0.01 mass% or more and 2.0 mass% or less is mentioned.
また、本発明の地盤改良体として、水、水硬性粉体、及びトリエタノールアミン又はその塩を含有するスラリーと土壌との混合物を硬化させてなる地盤改良体であって、
土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、
水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有し、
前記スラリーは、水／水硬性粉体の質量比が０．５以上１．５以下であり、
前記スラリーは、水硬性粉体の含有量に対するトリエタノールアミン又はその塩の含有量が０．０１質量％以上２．０質量％以下であり、
土壌１ｍ３あたりの前記スラリーの混合量が１００ｋｇ以上８００ｋｇ以下であり、
前記混合物は、水硬性粉体／土壌の質量比が０．０１以上１．０以下である、
地盤改良体が挙げられる。
In addition, as a ground improvement body of the present invention, it is a ground improvement body obtained by curing a mixture of water, hydraulic powder, and a slurry containing triethanolamine or a salt thereof with soil,
The soil is a soil in which the proportion of fine particles having a particle size of 0.074 mm or less is 50% by mass or more,
The hydraulic powder contains 5% by mass or more and 15% by mass or less of anhydrous gypsum,
The slurry has a water / hydraulic powder mass ratio of 0.5 to 1.5,
The content of triethanolamine or a salt thereof with respect to the content of hydraulic powder is 0.01% by mass or more and 2.0% by mass or less with respect to the content of hydraulic powder,
The mixing amount of the slurry per 1 m 3 of soil is 100 kg or more and 800 kg or less,
The mixture has a hydraulic powder / soil mass ratio of 0.01 or more and 1.0 or less.
Ground improvement body is mentioned.
〔地盤改良用スラリー〕
本発明の地盤改良用スラリーは、水、水硬性粉体、及びトリエタノールアミン又はその塩を含有する地盤改良用スラリーであって、水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有し、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌に用いられる、地盤改良用スラリーである。本発明の地盤改良用スラリーは、本発明の地盤の改良工法に好ましく用いられる。本発明の地盤の改良工法、地盤改良体で述べた事項は、適宜、本発明の地盤改良用スラリーに適用することができる。
[Slurry for ground improvement]
The slurry for ground improvement of the present invention is a slurry for ground improvement containing water, hydraulic powder, and triethanolamine or a salt thereof, and the hydraulic powder comprises 5% by mass to 15% by mass of anhydrous gypsum. It is a slurry for ground improvement which is contained in the following and is used for soil with a proportion of fine particles having a particle size of 0.074 mm or less of 50% by mass or more. The slurry for ground improvement according to the present invention is preferably used in the method for improving ground according to the present invention. The matters described in the ground improvement method and ground improvement body of the present invention can be appropriately applied to the ground improvement slurry of the present invention.
本発明の地盤改良用スラリーは、水／水硬性粉体の質量比が０．５以上１．５以下であることが好ましい。また、本発明の地盤改良用スラリーは、水硬性粉体の含有量に対するトリエタノールアミンの含有量が０．０１質量％以上２．０質量％以下であることが好ましい。 The slurry for ground improvement of the present invention preferably has a water / hydraulic powder mass ratio of 0.5 or more and 1.5 or less. Moreover, it is preferable that the slurry for ground improvement of this invention is 0.01 mass% or more and 2.0 mass% or less of content of the triethanolamine with respect to content of hydraulic powder.
本発明の地盤改良用スラリーは、地盤改良のために土壌と混合される地盤改良用のスラリー、例えばセメントミルクなどの水硬性組成物である。本発明の地盤改良用スラリーを用いることで、土壌が含む粘土の組成に関わらず地盤改良体の強度、例えば７日程度の初期強度と２８日程度の長期強度とを向上させることができる。
本発明の地盤改良用スラリーの使用量は、地盤改良用スラリーの種類、土壌（地盤）の種類などを考慮して設定できるが、本発明の地盤の改良方法や本発明の地盤改良体で述べた量となることが好ましい。
本発明の地盤改良用スラリーは、土壌１ｍ３あたり好ましくは１００ｋｇ以上、より好ましくは１５０ｋｇ以上、更に好ましくは２００ｋｇ以上、そして、好ましくは８００ｋｇ以下、より好ましくは７００ｋｇ以下、更に好ましくは６００ｋｇ以下、且つ水硬性粉体／土壌の質量比が好ましくは０．０１以上、より好ましくは０．０５以上、更に好ましくは０．１以上、そして、好ましくは１．０以下、より好ましくは０．９以下、更に好ましくは０．８以下で、土壌と混合して用いられるものが好ましい。
The slurry for ground improvement of the present invention is a slurry for ground improvement mixed with soil for ground improvement, for example, a hydraulic composition such as cement milk. By using the slurry for ground improvement of the present invention, the strength of the ground improvement body, for example, the initial strength of about 7 days and the long-term strength of about 28 days can be improved regardless of the composition of the clay contained in the soil.
The usage amount of the slurry for ground improvement of the present invention can be set in consideration of the type of slurry for ground improvement, the type of soil (ground), etc., but it is described in the ground improvement method of the present invention and the ground improvement body of the present invention It is preferable that the amount be different.
Soil improvement slurry of the present invention, soil 1 m 3 per Preferably 100kg or more, more preferably 150kg or more, more preferably 200kg or more, and, preferably 800kg or less, more preferably 700kg or less, more preferably 600kg or less, and The mass ratio of hydraulic powder / soil is preferably 0.01 or more, more preferably 0.05 or more, still more preferably 0.1 or more, and preferably 1.0 or less, more preferably 0.9 or less. More preferably, it is 0.8 or less and used in combination with the soil.
本発明の地盤改良用スラリーとして、水、水硬性粉体、及びトリエタノールアミン又はその塩を含有する地盤改良用スラリーであって、水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有し、水／水硬性粉体の質量比が０．５以上１．５以下であり、水硬性粉体の含有量に対するトリエタノールアミンの含有量が０．０１質量％以上２．０質量％以下であり、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌に用いられる、地盤改良用スラリーが挙げられる。 The slurry for ground improvement according to the present invention is a slurry for ground improvement containing water, hydraulic powder, and triethanolamine or a salt thereof, wherein the hydraulic powder comprises 5% by mass to 15% by mass of anhydrous gypsum. Contained below, the mass ratio of water / hydraulic powder is 0.5 or more and 1.5 or less, and the content of triethanolamine relative to the content of hydraulic powder is 0.01 mass% or more and 2.0 mass The slurry for ground improvement used for soil whose percentage of fine particles having a particle size of 0.074 mm or less is 50% by mass or less can be mentioned.
〔地盤改良用粉末固化材組成物〕
本発明の地盤改良用粉末固化材組成物は、水硬性粉体、及びトリエタノールアミン又はその塩を含有する地盤改良用粉末固化材組成物であって、水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有し、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌に用いられる、地盤改良用粉末固化材組成物である。本発明の地盤改良用粉末固化材組成物は、本発明の地盤の改良工法に好ましく用いられる。本発明の地盤の改良工法、地盤改良体、地盤改良用スラリーで述べた事項は、適宜、本発明の地盤改良用粉末固化材組成物に適用することができる。
[Powder-solidified material composition for ground improvement]
The powder solidifying material composition for ground improvement of the present invention is a powder solidifying material composition for ground improvement containing hydraulic powder and triethanolamine or a salt thereof, wherein the hydraulic powder is anhydrite It is a powder solidified material composition for ground improvement, which is used for soil containing 50% by mass or more of fine particles having a particle size of 0.074 mm or less, which is contained by mass% to 15% by mass. The powder solidifying material composition for ground improvement of the present invention is preferably used for the ground improvement method of the present invention. The matters described in the ground improvement method of the present invention, the ground improvement body, and the slurry for ground improvement can be appropriately applied to the powder solidified material composition for ground improvement of the present invention.
本発明の地盤改良用粉末固化材組成物は、水硬性粉体の含有量に対するトリエタノールアミン又はその塩の含有量が０．０１質量％以上２．０質量％以下であることが好ましい。 It is preferable that content of triethanolamine or its salt with respect to content of hydraulic powder is 0.01 mass% or more and 2.0 mass% or less with respect to content of hydraulic powder of this invention.
本発明の地盤改良用粉末固化材組成物は、地盤改良のために土壌と混合される地盤改良用の粉末固化材である。本発明の地盤改良用粉末固化材組成物を用いることで、土壌が含む粘土の組成に関わらず地盤改良体の強度、例えば７日程度の初期強度と２８日程度の長期強度とを向上させることができる。
本発明の地盤改良用粉末固化材組成物の使用量は、該組成物の組成、土壌（地盤）の種類などを考慮して設定できるが、本発明の地盤の改良方法や本発明の地盤改良体で述べた量となることが好ましい。
本発明の地盤改良用粉末固化材組成物は、水硬性粉体／土壌の質量比が、好ましくは０．０１以上、より好ましくは０．０５以上、更に好ましくは０．１以上、そして、好ましくは１．０以下、より好ましくは０．９以下、更に好ましくは０．８以下で、土壌と混合して用いられるものが好ましい。
The powdery solidifying material composition for ground improvement of the present invention is a powdery solidifying material for ground improvement mixed with soil for ground improvement. By using the powder / solidifier composition for ground improvement of the present invention, the strength of the ground improvement body, for example, the initial strength of about 7 days and the long-term strength of about 28 days, can be improved regardless of the composition of clay contained in the soil. Can.
The use amount of the powder solidifying material composition for ground improvement of the present invention can be set in consideration of the composition of the composition, the type of soil (ground) and the like, but the method for improving the ground of the present invention and the ground improvement of the present invention It is preferable to be the amount stated in the body.
The powder solidifying material composition for ground improvement of the present invention preferably has a hydraulic powder / soil mass ratio of 0.01 or more, more preferably 0.05 or more, still more preferably 0.1 or more, and preferably Is preferably 1.0 or less, more preferably 0.9 or less, and still more preferably 0.8 or less, and used in combination with the soil.
本発明の地盤改良用粉末固化材組成物として、水硬性粉体、及びトリエタノールアミン又はその塩を含有し、水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有し、水硬性粉体の含有量に対するトリエタノールアミン又はその塩の含有量が０．０１質量％以上２．０質量％以下であり、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌に用いられる、地盤改良用粉末固化材組成物が挙げられる。 The powder solidifying material composition for ground improvement according to the present invention contains hydraulic powder and triethanolamine or a salt thereof, and the hydraulic powder contains 5% by mass to 15% by mass of anhydrous gypsum, water The content of triethanolamine or its salt relative to the content of hard powder is 0.01 mass% or more and 2.0 mass% or less, and the proportion of fine particles having a particle diameter of 0.074 mm or less is 50 mass% or more The powder solidifying material composition for ground improvement used for soil may be mentioned.
＜実施例１及び比較例１＞
表１の成分を用いてソイルセメントを調製し、硬化体の強度を以下のように測定した。結果を表１に示す。
Example 1 and Comparative Example 1
Soil cement was prepared using the components of Table 1 and the strength of the cured product was measured as follows. The results are shown in Table 1.
（１）模擬粘性土の調製
プラスティックコンテナの容器内で、乾燥粘土６．１５ｋｇと蒸留水３．８５ｋｇとを、ハンドミキサーで混合し、２４時間以上吸水させて模擬粘性土を調製した。乾燥粘土は、スミクレー（住友大阪セメント（株）製、比重２．６５）又は笠岡粘土（カサネン工業（株）製、比重２．４５）を用いた。スミクレーによる模擬粘性土は、比重１．６２、吸水率６２．６％、粒径０．０７４ｍｍ以下の細粒分の割合が１００質量％であった。笠岡粘土による模擬粘性土は、比重１．５０、吸水率７７．６％、粒径０．０７４ｍｍ以下の細粒分の割合が１００質量％であった。
(1) Preparation of Simulated Viscous Soil In a plastic container, 6.15 kg of dry clay and 3.85 kg of distilled water were mixed with a hand mixer and allowed to absorb water for 24 hours or more to prepare a simulated viscous soil. As the dry clay, Sumiclay (manufactured by Sumitomo Osaka Cement Co., Ltd., specific gravity 2.65) or Kasaoka clay (manufactured by Kasanen Kogyo Co., Ltd., specific gravity 2.45) was used. The simulated clay soil produced by Sumiclay had a specific gravity of 1.62, a water absorption of 62.6%, and a proportion of fine particles having a particle size of 0.074 mm or less was 100% by mass. The simulated viscous soil of Sasaoka clay had a specific gravity of 1.50, a water absorption rate of 77.6%, and a proportion of fine particles having a particle size of 0.074 mm or less was 100% by mass.
（２）水硬性粉体と添加剤の混合
ホバート型モルタルミキサーに表１の粉体を投入し、表１の添加剤を添加し低速（６２ｒｐｍ）で５分間撹拌したものを粉体混合物として用いた。
(2) Mixing of hydraulic powder and additive The powder of Table 1 is charged into a Hobart mortar mixer, the additive of Table 1 is added, and the mixture stirred for 5 minutes at low speed (62 rpm) is used as a powder mixture. It was.
（３）セメントミルクの調製
５００ｍｌプラスチックカップ内で、混練水と（２）で調製した粉体混合物とをハンドミキサーで混合してセメントミルクを調製した。粉体混合物は、添加剤を混合する前の粉体について、混練水／粉体の比率が６０質量％となるように用いた。ここで、混練水は、蒸留水を用いた。
粉体は、下記のものを表１の組み合わせで用いた。
・ＮＣ：普通ポルトランドセメント、住友大阪セメント（株）製、比重３．１５
・無水石膏：（株）コクサイ商事製
(3) Preparation of cement milk In a 500 ml plastic cup, cemented milk was prepared by mixing kneading water and the powder mixture prepared in (2) with a hand mixer. The powder mixture was used in such a manner that the ratio of the mixed water / powder was 60% by mass with respect to the powder before mixing the additive. Here, distilled water was used as the kneading water.
The powder used the following thing by the combination of Table 1.
・ NC: Ordinary portland cement, manufactured by Sumitomo Osaka Cement Co., Ltd., specific gravity 3.15
Anhydrite: manufactured by Kokusai Shoji Co., Ltd.
（４）地盤改良体の調製
（１）で調製した模擬粘性土を地盤の土壌とし、これに（３）で調製したセメントミルクを注入して地盤改良を模擬的に行った。土壌１ｍ３あたりのセメントミルクの注入量は４００ｋｇに設定した。なお、それぞれの模擬粘性土から次のようにして試供体を作製した。
＜スミクレーの模擬粘性土からの試供体＞
模擬粘性土１３１２ｇ（８１０ｍｌ）とセメントミルク３２４ｇ（１８９ｍｌ）を、５００ｍｌプラスチックカップ内で、ハンドミキサーで１分間混合してソイルセメントとした。得られたソイルセメントを、直ちに型枠（直径５０ｍｍ×高さ１００ｍｍ）に充填した。充填は、テーブルバイブレータで１５秒の２層詰めとした。供試体は４本作製した。
＜笠岡粘土の模擬粘性土からの試供体＞
模擬粘性土１２３０ｇ（８２０ｍｌ）とセメントミルク３２８ｇ（１９１ｍｌ）を、５００ｍｌプラスチックカップ内で、ハンドミキサーで１分間混合してソイルセメントとした。得られたソイルセメントを、直ちに型枠（直径５０ｍｍ×高さ１００ｍｍ）に充填した。充填は、テーブルバイブレータで１５秒の２層詰めとした。供試体は４本作製した。
(4) Preparation of ground improvement body The simulated viscous soil prepared in (1) was used as the ground soil, and cement milk prepared in (3) was injected into the ground to simulate ground improvement. The amount of cement milk injected per 1 m 3 of soil was set to 400 kg. In addition, the sample body was produced as follows from each simulated viscous soil.
<Test sample from simulated clay soil of Sumicre>
1312 g (810 ml) of simulated viscous soil and 324 g (189 ml) of cement milk were mixed with a hand mixer for 1 minute in a 500 ml plastic cup to form soil cement. The soil cement thus obtained was immediately filled into a mold (diameter 50 mm × height 100 mm). The filling was performed by filling the two layers for 15 seconds with a table vibrator. Four specimens were prepared.
<Test sample from simulated cohesive soil of Sasaoka clay>
1230 g (820 ml) of simulated viscous soil and 328 g (191 ml) of cement milk were mixed with a hand mixer for 1 minute in a 500 ml plastic cup to form soil cement. The soil cement thus obtained was immediately filled into a mold (diameter 50 mm × height 100 mm). The filling was performed by filling the two layers for 15 seconds with a table vibrator. Four specimens were prepared.
（５）強度の測定
ソイルセメントを充填した型枠を、２０±２℃で静置し、７日後及び２８日後に脱型し、得られた硬化体（地盤改良体）の強度を、一軸圧縮試験機により測定した。結果を表１に示した。
(5) Measurement of strength The mold filled with soil cement is allowed to stand at 20 ± 2 ° C., and demolded after 7 and 28 days, and the strength of the obtained hardened body (ground improvement body) is uniaxially compressed. It measured by the tester. The results are shown in Table 1.
表中、粉体の欄の数字は質量比であり、例えば、ＮＣ／無水石膏＝９５／５は、ＮＣと無水石膏の質量比が９５／５であることを意味する（以下同様）。
また、表中、添加剤の添加量は、粉体に対する質量％である（以下同様）。
また、表中、強度の数値の下のかっこ内の数字は、同じ粉体において添加剤を使用しない比較例の強度を１００とする相対値である（以下同様）。
In the table, the numbers in the powder column are mass ratios, and for example, NC / anhydrous gypsum = 95/5 means that the mass ratio of NC to anhydrous gypsum is 95/5 (the same applies hereinafter).
Further, in the table, the addition amount of the additive is the mass% with respect to the powder (the same applies to the following).
Further, in the table, the numbers in parentheses under the numerical values of strength are relative values that make the strength of the comparative example with no additive in the same powder as 100 (the same applies hereinafter).
＜実施例２及び比較例２＞
実施例１と同様に、ただし、粉体として表２のものを用いて硬化体を調製し、強度を測定した。表２中、ＢＢとＳＬは以下のものである。結果を表２に示した。
・ＢＢ：高炉セメントＢ種、太平洋セメント株式会社製、密度３．０４ｇ／ｃｍ３
・ＳＬ：高炉スラグ、日鐵住金セメント（株）製スピリッツ４０００、比重２．９１
Example 2 and Comparative Example 2
A cured product was prepared as in Example 1 except that the powder shown in Table 2 was used as a powder, and the strength was measured. In Table 2, BB and SL are as follows. The results are shown in Table 2.
・ BB: Blast furnace cement type B, manufactured by Pacific Cement Co., Ltd., density 3.04 g / cm 3
・ SL: Blast furnace slag, Nippon Steel Sumikin Cement Co., Ltd. spirits 4000, specific gravity 2.91
＜実施例３及び比較例３＞
実施例１と同様に、ただし、セメントミルクの調製に用いる混練水として人工海水を用いて硬化体を調製し、硬化体の強度を測定した。ここで、人工海水は、富田製薬株式会社「マリンアートＳＦ−１」を使用した。結果を表３に示した。
Example 3 and Comparative Example 3
In the same manner as Example 1, however, a hardened body was prepared using artificial seawater as kneading water used for preparation of cement milk, and the strength of the hardened body was measured. Here, the artificial seawater used Tomita Pharmaceutical Co., Ltd. "marine art SF-1". The results are shown in Table 3.
Claims (23)
土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、
水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有する、
地盤の改良工法。 It is an improvement method of the ground which mixes hydraulic powder and triethanolamine or its salt in soil,
The soil is a soil in which the proportion of fine particles having a particle size of 0.074 mm or less is 50% by mass or more,
The hydraulic powder contains 5% by mass or more and 15% by mass or less of anhydrous gypsum,
Ground improvement method.
＜方法（Ｉ）＞
水と、水硬性粉体と、トリエタノールアミン又はその塩とを含有し、水／水硬性粉体の質量比が０．５以上１．５以下であるスラリーを、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌と混合する方法。
＜方法（II）＞
水硬性粉体と、トリエタノールアミン又はその塩とを、それぞれ、粉体で粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌と混合する方法。 The soil improvement method according to any one of claims 1 to 4, wherein the hydraulic powder and triethanolamine or a salt thereof are mixed with the soil by any of the following methods (I) and (II): .
<Method (I)>
A slurry containing water, hydraulic powder, triethanolamine or a salt thereof, and having a water / hydraulic powder mass ratio of 0.5 to 1.5, has a particle diameter of 0.074 mm or less Method of mixing with soil with a proportion of fine particles of 50% by mass or more.
<Method (II)>
A method of mixing a hydraulic powder and triethanolamine or a salt thereof with soil each having a ratio of fine particles having a particle size of 0.074 mm or less and having 50% by mass or more.
土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、
水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有する、
地盤改良体。 A ground improvement body comprising soil, hydraulic powder, and triethanolamine or a salt thereof,
The soil is a soil in which the proportion of fine particles having a particle size of 0.074 mm or less is 50% by mass or more,
The hydraulic powder contains 5% by mass or more and 15% by mass or less of anhydrous gypsum,
Ground improvement body.
土壌が、粒径０．０７４ｍｍ以下の細粒分の割合が５０質量％以上の土壌であり、
水硬性粉体が、無水石膏を５質量％以上１５質量％以下含有する、
地盤改良体。 A ground improvement body obtained by curing a mixture of water, hydraulic powder, and a slurry containing triethanolamine or a salt thereof with soil,
The soil is a soil in which the proportion of fine particles having a particle size of 0.074 mm or less is 50% by mass or more,
The hydraulic powder contains 5% by mass or more and 15% by mass or less of anhydrous gypsum,
Ground improvement body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017084591A JP6578316B2 (en) | 2017-04-21 | 2017-04-21 | Ground improvement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017084591A JP6578316B2 (en) | 2017-04-21 | 2017-04-21 | Ground improvement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2018178672A true JP2018178672A (en) | 2018-11-15 |
| JP6578316B2 JP6578316B2 (en) | 2019-09-18 |
Family
ID=64282912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2017084591A Active JP6578316B2 (en) | 2017-04-21 | 2017-04-21 | Ground improvement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6578316B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020122293A (en) * | 2019-01-29 | 2020-08-13 | サン・アンド・シイ・コンサルタント株式会社 | Method for simultaneously improving contaminated soil and constructing foundation of overlaid structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5523110A (en) * | 1978-06-20 | 1980-02-19 | Onoda Cement Co Ltd | Grout and grouting method |
| JPS56166288A (en) * | 1980-05-27 | 1981-12-21 | Taisei Corp | Solidifying method of organic soil and its solidifying agent composition |
| JP2008120847A (en) * | 2006-11-08 | 2008-05-29 | Denki Kagaku Kogyo Kk | Admixture for stabilizing ground, ground stabilizing material and method for ground stabilizing construction using the same |
| JP2017014350A (en) * | 2015-06-30 | 2017-01-19 | 宇部興産株式会社 | Soil improver and soil improvement method |
-
2017
- 2017-04-21 JP JP2017084591A patent/JP6578316B2/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5523110A (en) * | 1978-06-20 | 1980-02-19 | Onoda Cement Co Ltd | Grout and grouting method |
| JPS56166288A (en) * | 1980-05-27 | 1981-12-21 | Taisei Corp | Solidifying method of organic soil and its solidifying agent composition |
| JP2008120847A (en) * | 2006-11-08 | 2008-05-29 | Denki Kagaku Kogyo Kk | Admixture for stabilizing ground, ground stabilizing material and method for ground stabilizing construction using the same |
| JP2017014350A (en) * | 2015-06-30 | 2017-01-19 | 宇部興産株式会社 | Soil improver and soil improvement method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020122293A (en) * | 2019-01-29 | 2020-08-13 | サン・アンド・シイ・コンサルタント株式会社 | Method for simultaneously improving contaminated soil and constructing foundation of overlaid structure |
| JP7190137B2 (en) | 2019-01-29 | 2022-12-15 | サン・アンド・シイ・コンサルタント株式会社 | Simultaneous construction method for improving contaminated soil and laying foundations for superimposed structures |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6578316B2 (en) | 2019-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6276027B2 (en) | Fast-curing buried material | |
| CN108203281A (en) | A kind of microdilatancy injecting paste material and preparation method thereof | |
| CN101275394A (en) | Curing method for saline soil | |
| JP6322452B2 (en) | Backfill material | |
| JP6487133B1 (en) | Ground improvement method | |
| JP4657567B2 (en) | Foaming agent for plastic light weight injection material, manufacturing method of plastic light weight injection material using the same, and filling method thereof | |
| JP6498716B2 (en) | Ground improvement method | |
| JP6578316B2 (en) | Ground improvement method | |
| JP7299869B2 (en) | Ground improvement method | |
| KR101341103B1 (en) | Composition for Ground Hardening And Ground Mortar Including the Same | |
| JP7265498B2 (en) | Ground improvement method | |
| JP2004211382A (en) | Soil improving method | |
| JP3438499B2 (en) | Solidified material for fluidized backfill and fluidized treated soil using the same | |
| JP6755828B2 (en) | Ground improvement method | |
| JP2004284844A (en) | Plastic lightweight grouting material, method of manufacturing the same and filling process for the same | |
| JP2503771B2 (en) | Solidifying material for cohesive soil of volcanic ash | |
| KR20150053523A (en) | Eco-friendly packaging material composition cementless, manufacturing method and packaging method using it | |
| JP7339126B2 (en) | Additive for hydraulic composition for spraying | |
| JP7326384B2 (en) | Ground improvement method | |
| JP6924738B2 (en) | Additives for soil cement | |
| JP4798734B2 (en) | Hydraulic composition | |
| JP4020997B2 (en) | Cement admixture and soil solidifier for soil solidification | |
| JP7441685B2 (en) | Fluidized soil and its manufacturing method | |
| JP2023083701A (en) | Soil improvement method | |
| JP2820972B2 (en) | Rapid hardening material for injection and cement composition for injection using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20180606 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20190228 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20190312 |
|
| A601 | Written request for extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A601 Effective date: 20190408 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20190423 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20190820 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20190826 |
|
| R151 | Written notification of patent or utility model registration |
Ref document number: 6578316 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R151 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |