JP4292648B2 - Method for checking the degree of mixing between earth and sand and improved additives - Google Patents
Method for checking the degree of mixing between earth and sand and improved additives Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、土砂と改良添加剤との混合度合検査方法に関し、特にその混合度合が容易に判定できるようにした方法に関する。
【０００２】
【従来の技術】
土質安定化処理工法の改良原理は、土砂に混ぜ合される添加剤による化学処理と、転圧、締固めなどの物理的処理とにより、地盤の物理的、力学的性質を改善するものである。例えば、土砂に、改良添加剤としてセメントを混合することで、強度向上を図り、また、ベントナイトの混合により透水係数を低下させるなど、各種の効果を発揮できる。この場合、土砂に対する添加剤の均一な混合が、必要とされる特性改善を図り、経済性を確保する上で重要である。
【０００３】
【発明が解決しようとする課題】
しかしながら、従来では、添加剤の混合前後の色調変化等の視覚的変化に有意差がないため、視覚的手段等の簡便で明確な結果が得られる手段によっては混合度合を確認できず、所期の混合度合となったか否かを作業現場では直接確認することが難しかった。従って、作業現場においては、オーガの混合攪拌時間などでその混合度合をある程度類推するとともに、供試体を採取して各種の分析を行う必要があり、このため、次のような課題があった。
【０００４】
すなわち、分析費用がかかる割に、供試体自体が部分的なサンプルに過ぎないため、改良土全体の混合度合が把握できず、また、分析結果が判明するまでは時間がかかり、それまで工期を遅延させなければならないだけでなく、外観変化の判定が難しいことから、写真などによる簡易な判定をおこなうことが出来なかった。
【０００５】
他方、ベントナイト等を用いて改良対象となる土砂の透水係数を低下させる場合、係るベントナイト等のコストをかなり費やす必要もあり、またその施工施設と相まって施工管理全体に及ぼすコスト上昇の影響は無視できないものであった。
【０００６】
本発明は、以上の課題を解決するものであって、施工現場においてその混合度合を即時的かつ簡便明確に確認でき、また土砂の透水係数低下を簡便かつ低コストに図りうるようにした土砂と改良添加剤との混合度合検査方法を提供するものである。
【０００７】
【課題を解決するための手段】
以上の目的を達成するため、本発明は、改良しようとする土砂に改良添加剤を添加する際、予め改良添加剤内に、水等と接触することでスケールを形成するカルシウム系粒子を混合することにより前記土砂の透水性を低下せしめ、スケールを形成することによって形状が変化した前記カルシウム系粒子を目視確認することにより土砂と改良添加剤との混合度合を判別することを特徴とする。
【００１０】
本発明の検査方法では、予め添加剤内にスケールを形成するカルシウム系粒子を混合することにより処理対象となる土砂の透水性を何らの手間をかけることなく簡便確実に低下せしめることを可能とする。他方、スケールを形成したカルシウム系粒子は球形ではない異形状に変形する為、容易に安定処理度の混合度合を検証することも出来る。
【００１１】
【発明の実施の形態】
以下、本発明の好ましい実施の形態を説明するが、先ず、参考例として、異物として有色粉体を用いた場合の土砂と改良添加剤との混合度合検査方法を説明する。該有色粉体は例えば特開平４−２２４１４６号公報に記載された方法により得られた高強度着色スラグが好適に用いられる。この着色スラグは、廃棄物である溶融スラグの重量比（ＣａＯ＋Ｆｅ２０３）／（Ｓｉ０３＋Ａｌ２０３）が０．１０〜０．５０となるように、ＣａＯ源材、Ｆｅ２０３源材、ＳｉＯ２源材及び／又はＡｌ２０３源材を添加して組成調整する工程、組成調整した廃棄物を溶融する工程、溶離物を冷却してスラグとする工程、スラグを９００〜１３００゜Ｃの雰囲気下で、０．１〜３．０時間加熟処理する工程、とによって得られる高強度着色スラグであり、一般に骨材などの用途に供される安価な再生素材である。
【００１２】
得られた高強度着色スラグは重量比（ＣａＯ＋Ｆｅ２０３）／（Ｓｉ０３＋Ａｌ２０３）と加熱処理条件とを調整することで、黄色、黄緑色、茶色、銀色などの各種色彩に着色されたスラグとなる。この着色スラグは、製造後、粉砕され分級などにより粒径調整を行うことで、着色粉末となる。
【００１３】
従って、前記各色の中から改良しようとする土砂に対する識別性のある色彩、粒度を選択して用いることができる。例えば、茶色などは改良土砂の色彩と類似し、識別性がないため、好ましくなく、明確な識別性をもたらす色彩として黄色、黄緑色、銀色の中から選択することが好ましい。
【００１４】
本発明に用いる改良用添加剤としては、その目的用途に応じて、セメント、あるいはベントナイトが用いられ、これに前記着色粉末を所定混合比で混合することで有色添加剤とすることができる。改良添加剤としてセメントを用いる場合には、その色彩は白色、明灰色ないし灰色であり、これに前記有色粉末を加えて特定の色彩に調整するには、その識別性の点から基色となるセメントの色彩に対し、その色彩が目視により有意差をもたらす範囲の混合比であって、改良材としての機能を損わない組成比で混合すれば良い。
【００１５】
ところで、前記着色スラグは、一般に骨材としての用途に供されるものであるため、モルタルの細骨材としても機能するとともに、アルカリ性雰囲気で退色せず好都合であり、しかもその原材料が廃棄物からの再生によって得られる材料であるため、安価である。
【００１６】
改良添加剤として、ベントナイトを用いる場合においても、セメントと同様であり、色彩が目視により有意差をもたらす範囲の混合比とすれば良い。但し、ベントナイトの場合にも、その泥水としての機能が損われない混合比とすべきである。
【００１７】
本発明の参考例では、改良対象となる土砂に混合される異物は、土砂の土粒子形状と異なる異形粒子で例えば樹脂製の棒状体や球状体等である。これらの異物は、勿論土砂とは異なる彩色が施されているのは当然であり、改良工法を実施中においても容易に視認可能なサイズを有するものとする。更に土砂の比重とは異なる比重を有するものであるとより好適である。混合度合を確認する手順や手法は有色粉体を異物として適用した場合と同様である。
【００１８】
また、本発明の別の参考例では、改良添加剤に混合される前記異物が鉄粉等の金属粒子であり、例えば係る改良土砂表面における金属粒子の帯磁気分布を検出することで数値分布的に明確に混合具合を確認することも可能となる。簡易な磁気測定器等を携帯するなどして混合具合の判断を即時かつ簡便に下すことも容易である。この金属粒子は特に鉄に限定されず、帯磁可能である特性を備えるものであればいずれも採用可能である。上記の、有色粉体、異形粒子、蛍光性異物等、金属粒子などといった各種異物はおのおの単独に用いるだけでなく、各々の特性を適宜併せて備えた異物を構成して用いることもできるのは勿論である。
【００１９】
また、本発明の一実施形態では、改良添加剤に混合される前記異物が鉄粉等の金属粒子であり、例えば係る改良土砂表面における金属粒子の帯磁気分布を検出することで数値分布的に明確に混合具合を確認することも可能となる。簡易な磁気測定器等を携帯するなどして混合具合の判断を即時かつ簡便に下すことも容易である。この金属粒子は特に鉄に限定されず、帯磁可能である特性を備えるものであればいずれも採用可能である。上記の、有色粉体、異形粒子、蛍光性異物等、金属粒子などといった各種異物はおのおの単独に用いるだけでなく、各々の特性を適宜併せて備えた異物を構成して用いることもできるのは勿論である。
【００２０】
本発明の実施形態では、改良しようとする土砂に改良添加剤を添加する際、予め添加剤内に水等と接触することでスケールを形成するカルシウム系粒子を混合する。このことにより、処理対象となる土砂の透水性を何らの手間をかけることなく簡便確実に低下せしめることができ、施工効率及びコストの両面について改善効果を発揮するのである。他方、スケールを形成したカルシウム系粒子は球形ではない異形状に変形する為、上述の有色粉体その他による混合度合検査方法を適用すれば容易に安定処理度の混合度合を検証することも出来る。
【００２１】
実際の改良作業は、以上のような各種異物を適宜量準備し、次にオーガによって改良対象となる土砂を攪拌しながら前記異物を加えることによって行われる。例えば異物が有色粉体である場合には、土砂攪拌を行いつつ、改良土砂の色彩分布を目視確認することによってその混合度合、混合比率を一目瞭然で容易に判別できる。つまり、均一に混合が行われたならば、色彩分布も均一である。また不均一の場合にはまだらとなり、色彩分布が偏在するため、これらの状況が現場で直接目視確認により行え、混合作業終了の目安とすることが出来る。
【００２２】
上記の場合、混合比についても添加剤自体の色調と混合後の色調変化によりどの程度の混合比で混合されたかを目視判定可能である。さらには、この時点で写真記録を取っておくことで、その後の資料とすることが出来る。好ましくは、改良しようとする土砂粒子の大きさによって混合度合が異なるので、事前に土砂の粒度を調査し、この結果に基づき、有色粉末の粒径を選択すれば、混合を良好におこなうことが出来る。
【００２３】
また、改良しようとする土砂粒子の比重によっても、混合度合が異なるので、この場合には、発泡スラグなどの比重の軽い材料も加えて改良添加剤とすれば、混合を良好におこなうことが出来る。
【００２５】
【発明の効果】
以上の説明により明らかなように、本発明による土砂と改良添加剤との混合度合検査方法によれば、施工現場において即時的に、混合度合を土粒子形状と異なる形状のスケールの分布状況により視覚的に確認することも可能であり、面倒で費用のかかる分析に頼る必要はない。また混合土全体を見ることが出来るため、混合度合を正確に把握できる。
【００２６】
また、現場でリアルタイムで混合度合を判定できるため、工期短縮に貢献できる。さらには外観による検査であるため、作業後に混合現場を写真に撮っておくことで、後の資料に供することができる。
【００２７】
加えて、予め添加剤内に発錆性を有する金属粒子もしくはスケールを形成するカルシウム系粒子を混合することにより処理対象となる土砂の透水性を何らの手間をかけることなく簡便確実に低下せしめることを可能とする。他方、発錆した該金属粒子表面は大抵において赤色を呈し、またスケールを形成したカルシウム系粒子は球形ではない異形状に変形する為、上述の有色粉体その他による混合度合検査方法を適用すれば容易に安定処理度の混合度合を検証することも出来る。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for inspecting the degree of mixing of earth and sand and an improved additive, and more particularly, to a method in which the degree of mixing can be easily determined.
[0002]
[Prior art]
The improvement principle of the soil stabilization treatment method is to improve the physical and mechanical properties of the ground by chemical treatment with additives mixed with the soil and physical treatment such as rolling and compaction. . For example, various effects can be exhibited such as mixing cement with earth and sand as an improving additive to improve strength and reducing the permeability coefficient by mixing bentonite. In this case, uniform mixing of the additive with the earth and sand is important for improving the required properties and ensuring economic efficiency.
[0003]
[Problems to be solved by the invention]
However, conventionally, there is no significant difference in visual changes such as color changes before and after the mixing of additives, so the degree of mixing cannot be confirmed depending on simple means such as visual means that can provide clear results. It was difficult to confirm directly at the work site whether or not the degree of mixing was reached. Therefore, at the work site, it is necessary to analogize the degree of mixing to some extent by the mixing agitation time of the auger, etc., and it is necessary to collect various specimens and perform various analyses. For this reason, there are the following problems.
[0004]
In other words, although the analysis cost is high, the specimen itself is only a partial sample, so it is not possible to grasp the degree of mixing of the entire improved soil, and it takes time until the analysis results become clear. In addition to having to delay, it was difficult to judge the change in appearance, so it was not possible to make a simple judgment using photographs.
[0005]
On the other hand, when bentonite is used to reduce the permeability coefficient of the sediment to be improved, it is necessary to spend a considerable amount of the cost of the bentonite, etc., and the influence of the cost increase on the overall construction management combined with the construction facility cannot be ignored. It was a thing.
[0006]
The present invention has been made to solve the above problems, and sand mixtures degree can immediate and convenient clearly confirmed, also was to be working to decrease permeability of sediment easily and cost in construction site A method for inspecting the degree of mixing with an improved additive is provided.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention mixes calcium-based particles that form scales by contacting with water or the like in advance in the additive when the additive is added to the soil to be improved. Thus, the water permeability of the earth and sand is lowered, and the mixing degree of the earth and sand and the improved additive is determined by visually confirming the calcium-based particles whose shape has been changed by forming a scale.
[0010]
In the inspection method of the present invention, it allows allowed to drop conveniently reliably without imposing any effort the permeability of soil to be processed by mixing the calcium-based particles forming the scale in the advance and additives To do. On the other hand, calcium-based particles to form a scale is to deform to a different shape not spherical, it is possible to verify the mixing degree of stability processing degree easily.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described . First, as a reference example, a method for inspecting the degree of mixing of earth and sand and an improved additive when colored powder is used as a foreign substance will be described. As the colored powder, for example, high-strength colored slag obtained by the method described in JP-A-4-224146 is preferably used. This colored slag is composed of CaO source material, Fe 2 0 3 so that the weight ratio (CaO + Fe 2 0 3 ) / (Si0 3 + Al 2 0 3 ) of the molten slag as waste is 0.10 to 0.50. Source composition, SiO 2 source material and / or Al 2 O 3 source material addition process for adjusting composition, melting composition-adjusted waste process, cooling eluate to slag, slag from 900 to It is a high-strength colored slag obtained by a ripening treatment in an atmosphere of 1300 ° C. for 0.1 to 3.0 hours, and is an inexpensive recycled material generally used for applications such as aggregates.
[0012]
The obtained high-strength colored slag is colored in various colors such as yellow, yellowish green, brown, and silver by adjusting the weight ratio (CaO + Fe 2 0 3 ) / (Si0 3 + Al 2 0 3 ) and heat treatment conditions. Slag. This colored slag is pulverized after production, and the particle size is adjusted by classification or the like to become colored powder.
[0013]
Therefore, it is possible to select and use distinguishable colors and particle sizes for the earth and sand to be improved from among the colors. For example, brown or the like is not preferable because it is similar to the color of the improved earth and sand and has no distinguishability, and is preferably selected from yellow, yellow-green, and silver as a color that provides clear distinguishability.
[0014]
As the additive for improvement used in the present invention, cement or bentonite is used according to its intended use, and the colored powder can be made into a colored additive by mixing it with a predetermined mixing ratio. When cement is used as an improvement additive, the color is white, light gray or gray, and the color powder is added to this to adjust to a specific color. The mixing ratio is within a range in which the color causes a significant difference visually, and the mixing ratio may be such that the function as the improving material is not impaired.
[0015]
By the way, the colored slag is generally provided for use as an aggregate, so that it functions as a fine aggregate of mortar, and is convenient without being discolored in an alkaline atmosphere. Since it is a material obtained by recycling, it is inexpensive.
[0016]
Even when bentonite is used as the improving additive, it is the same as that of cement, and the mixing ratio may be within a range in which the color causes a significant difference visually. However, even in the case of bentonite, the mixing ratio should be such that the function as muddy water is not impaired.
[0017]
In the reference example of the present invention, the foreign matter mixed with the earth and sand to be improved is a deformed particle different from the earth particle shape of the earth and sand, for example, a resin rod or spherical body. Naturally, these foreign matters are naturally colored differently from earth and sand, and have a size that can be easily visually recognized even during the improved construction method. Furthermore, it is more suitable that it has a specific gravity different from the specific gravity of earth and sand. The procedure and method for confirming the degree of mixing is the same as when colored powder is applied as a foreign substance.
[0018]
Further, in another reference example of the present invention, the foreign matter mixed with the improved additive is a metal particle such as iron powder, for example, by detecting the magnetic distribution of the metal particles on the surface of the improved earth and sand, It is also possible to clearly check the mixing condition. It is also easy to immediately and simply make a judgment on the mixing condition by carrying a simple magnetic measuring instrument or the like. The metal particles are not particularly limited to iron, and any metal particles can be used as long as they have the property of being magnetized. The above-mentioned various kinds of foreign matters such as colored powders, irregularly shaped particles, fluorescent foreign matters, metal particles, etc. can be used not only individually, but also can be used by constituting foreign matters having appropriate characteristics. Of course.
[0019]
Further, in one embodiment of the present invention, Ri Oh the foreign substance to be mixed with the modifying additive with metal particles such as iron powder, numerical distributive by detecting the bands magnetic distribution of the metal particles in the improved soil surface according e.g. It is also possible to clearly check the mixing condition. It is also easy to immediately and simply make a judgment on the mixing condition by carrying a simple magnetic measuring instrument or the like. The metal particles are not particularly limited to iron, and any metal particles can be used as long as they have the property of being magnetized. The above-mentioned various kinds of foreign matters such as colored powders, irregularly shaped particles, fluorescent foreign matters, metal particles, etc. can be used not only individually, but also can be used by constituting foreign matters having appropriate characteristics. Of course.
[0020]
In an embodiment of the present invention, when adding improving additive soil to be improved, you mixed calcium-based particles forming the scale by contact with water or the like in advance in the additive. As a result, the water permeability of the earth and sand to be treated can be reduced easily and reliably without any effort, and the improvement effect is exhibited in terms of both construction efficiency and cost. On the other hand, scale the formed calcium-based particles to deform to a different shape not spherical, it is possible to verify the degree of mixing of easily and stably processing degree by applying the mixed degree test method according to the above-mentioned colored powder Other .
[0021]
The actual improvement work is performed by preparing an appropriate amount of various foreign matters as described above, and then adding the foreign matters while stirring the earth and sand to be improved by an auger. For example, when the foreign substance is colored powder, the mixing degree and mixing ratio can be easily discriminated easily by visually checking the color distribution of the improved earth and sand while stirring the earth and sand. That is, if mixing is performed uniformly, the color distribution is also uniform. In the case of non-uniformity, it becomes mottled and the color distribution is unevenly distributed. Therefore, these conditions can be confirmed by visual confirmation directly at the site, and can be used as a standard for the end of the mixing operation.
[0022]
In the case described above, the mixing ratio can be visually determined based on the color tone of the additive itself and the change in the color tone after mixing. Furthermore, by keeping a photo record at this point, it can be used as subsequent material. Preferably, since the degree of mixing differs depending on the size of the earth and sand particles to be improved, if the particle size of the earth and sand is investigated in advance and the particle size of the colored powder is selected based on this result, the mixing can be performed satisfactorily. I can do it.
[0023]
In addition, since the degree of mixing varies depending on the specific gravity of the earth and sand particles to be improved, in this case, addition of a material with a low specific gravity such as foamed slag can be used to improve mixing. .
[0025]
【The invention's effect】
As is apparent from the above description, according to the method for checking the degree of mixing of earth and sand according to the present invention, the degree of mixing is visually determined on the construction site by the distribution of scales having a shape different from the shape of the soil particles. Ri also possible der be confirmed to, there is no need to resort to laborious and cost analysis. Moreover, since the whole mixed soil can be seen, the mixing degree can be accurately grasped.
[0026]
In addition, since the degree of mixing can be determined in real time on site, it can contribute to shortening the construction period. Furthermore, since the inspection is based on the appearance, taking a picture of the mixing site after work can be used for later materials.
[0027]
In addition, the water permeability of the earth and sand to be treated can be reduced easily and reliably without any trouble by mixing metal particles with rusting properties or calcium-based particles that form scales in the additive in advance. Is possible. On the other hand, the surface of the rusted metal particles is mostly red, and the calcium-based particles forming the scale are deformed into an irregular shape other than a spherical shape. The mixing degree of the stable processing degree can be easily verified.
Claims (1)
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| JP26372799A JP4292648B2 (en) | 1999-09-17 | 1999-09-17 | Method for checking the degree of mixing between earth and sand and improved additives |
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| JP26372799A JP4292648B2 (en) | 1999-09-17 | 1999-09-17 | Method for checking the degree of mixing between earth and sand and improved additives |
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| JP4292648B2 true JP4292648B2 (en) | 2009-07-08 |
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| JP4813636B2 (en) * | 1999-08-31 | 2011-11-09 | 株式会社神戸製鋼所 | Stabilized soil |
| JP4868386B2 (en) * | 2005-09-07 | 2012-02-01 | 公益財団法人鉄道総合技術研究所 | Roadbed improvement material and visibility improvement method thereof |
| JP2009112548A (en) * | 2007-11-07 | 2009-05-28 | Toyobo Co Ltd | Bedding apparatus excellent in cushion characteristic and silence property, and method for manufacturing the same |
| JP6963929B2 (en) * | 2017-08-02 | 2021-11-10 | フジモリ産業株式会社 | Ground improvement condition inspection method |
| JP7474522B2 (en) | 2022-04-27 | 2024-04-25 | 株式会社テノックス九州 | How to check the mixed condition of ground improvement material |
| JP2023167916A (en) * | 2022-05-13 | 2023-11-24 | 株式会社テノックス九州 | Excavation and agitation device, and excavation and agitation method |
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