JP2002080849A - Method for producing ground improvement material - Google Patents
Method for producing ground improvement materialInfo
- Publication number
- JP2002080849A JP2002080849A JP2000273329A JP2000273329A JP2002080849A JP 2002080849 A JP2002080849 A JP 2002080849A JP 2000273329 A JP2000273329 A JP 2000273329A JP 2000273329 A JP2000273329 A JP 2000273329A JP 2002080849 A JP2002080849 A JP 2002080849A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- water
- ground improvement
- soluble polymer
- hydraulic
- 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
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、地盤改良材の製造
方法に関するものである。[0001] The present invention relates to a method for producing a ground improvement material.
【０００２】[0002]
【従来の技術】建設工事に伴って発生する土の処理方法
が問題になっている。そのために最近では、発生土に繊
維を混入した状態で法面に吹き付けて法面保護に利用す
る方法、発泡スチロールの粒を混入して軽量盛り土に利
用する方法、セメントを添加してスラリー状にして締め
固めを必要としない低強度の埋め戻し土に利用する方法
などが検討されている。あるいはセメントを加えた後に
高圧でプレスして骨材を製造する方法、焼成して骨材を
製造する方法なども検討されている。2. Description of the Related Art A method of treating soil generated during construction work has become a problem. For this purpose, recently, a method of spraying the slope with fibers mixed in the generated soil and using it for slope protection, a method of mixing styrofoam grains and using it for lightweight embankment, adding a cement to make a slurry Methods for using low-strength backfill soil that does not require compaction are being studied. Alternatively, a method of producing aggregate by pressing at a high pressure after adding cement, and a method of producing aggregate by firing are also being studied.
【０００３】[0003]
【従来技術の問題点】前記したような従来の、建設発生
土の利用方法は次のような問題点があった。 ＜イ＞発泡スチロールや有機繊維を混入する方法は、高
分子化合物などの分解しない材料を混入することにな
り、自然環境を維持する観点から好ましいものではな
い。 ＜ロ＞建設発生土を用いて骨材を製造する方法は、コス
ト面から、および骨材の品質確保の面から実用化にはさ
らに検討が必要である。2. Description of the Related Art The conventional method of using construction soil as described above has the following problems. <A> The method of mixing styrofoam and organic fibers involves mixing a material that does not decompose, such as a polymer compound, and is not preferable from the viewpoint of maintaining a natural environment. <B> It is necessary to further study the method of manufacturing aggregate using the soil generated from construction from the viewpoint of cost and securing the quality of the aggregate.
【０００４】[0004]
【本発明の目的】本発明は上記のような問題を解決する
ためになされたもので、建設発生土を低いコストで有効
に利用した、地盤改良材の製造方法を提供することを目
的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a ground improvement material, which effectively utilizes construction waste soil at low cost. .
【０００５】[0005]
【課題を解決するための手段】上記のような目的を達成
するために本発明の地盤改良材の製造方法は、対象とす
る土にセメントなどの水硬性材を添加、混合、攪拌し、
次に、水溶性高分子の粉末を添加、混合、攪拌して粒状
化させ、次に、この粒状化した土の表面に水硬性無機質
材を添加して粒状体の表面を被覆し、次に、養生するこ
とによって製造する、地盤改良材の製造方法を特徴とし
たものである。In order to achieve the above object, a method for producing a ground improvement material according to the present invention comprises adding a hydraulic material such as cement to a target soil, mixing and stirring.
Next, a powder of a water-soluble polymer is added, mixed, stirred and granulated, and then a hydraulic inorganic material is added to the surface of the granulated soil to cover the surface of the granulated material. And a method of manufacturing a ground improvement material manufactured by curing.
【０００６】[0006]
【本発明の実施の態様】以下、図面を参照しながら本発
明の地盤改良材の製造方法の実施例について説明する。Embodiments of the present invention will be described below with reference to the drawings.
【０００７】＜イ＞全体の工程。 本発明の製造方法は、次のような工程から構成する。 値水硬性材料を添加する工程。 水溶性高分子を添加する工程。 粒状化した土の表面を被覆する工程。 養生する工程。<A> Overall process. The manufacturing method of the present invention comprises the following steps. Adding a hydraulic material. A step of adding a water-soluble polymer. A step of coating the surface of the granulated soil. Curing process.
【０００８】＜ロ＞対象とする土。 本発明の製造に利用する土は、含水比が塑性限界から液
性限界内のもの、もしくは液性限界以上でｑｃ（コーン
貫入強度）が２ｋｇｆ／ｃｍ2以上のものが望ましい。
たとえば関東ロームの場合では含水比が５０から１５０
％程度のものが該当する。ただし塑性限界以下である場
合では加水し、一方、液性限界以上で適用範囲外である
場合には何らかの方法で脱水することによって使用する
ことができる。<B> Target soil. The soil used in the production of the present invention is desirably one having a water content within a plastic limit to a liquid limit, or one having a liquid content limit or more and a qc (cone penetration strength) of 2 kgf / cm 2 or more.
For example, in the case of Kanto loam, the water content is 50 to 150.
%. However, when it is below the plastic limit, it can be used by adding water, and when it is above the liquid limit and out of the applicable range, it can be used by dehydrating by some method.
【０００９】＜ハ＞水硬性材を添加する工程。 上記のような特性を備えた土に、セメントなどの水硬性
材を添加、混合、攪拌する。このように、まず最初に対
象土に水硬性材料を添加する点が本発明の方法の特徴の
ひとつである。それに続く以下のような工程の前にまず
水硬性材料を添加しておくことによって次のような効果
がある。すなわち、水硬性材料を高含水比土に添加する
ことにより、養生後に必要な一軸圧縮強度で１〜５ｋｇ
ｆ／ｃｍ2程度発揮する。この必要な一軸圧縮強度とす
るためには、高含水比土１ｍ2当たり、普通ポルトラン
ドセメント４０〜８０ｋｇ添加することが好ましい。こ
の添加量が少ないと強度が不足する。添加量が過剰とな
ると、水分が不足ぎみとなり粒状化剤の効果が低下する
傾向にある。<C> A step of adding a hydraulic material. A hydraulic material such as cement is added to soil having the above characteristics, mixed, and stirred. Thus, one of the features of the method of the present invention is that the hydraulic material is first added to the target soil. The following effects can be obtained by first adding a hydraulic material before the following process as described below. That is, by adding the hydraulic material to the high water content soil, the required uniaxial compressive strength after curing is 1 to 5 kg.
Exhibits about f / cm 2 . In order to obtain the necessary uniaxial compressive strength, it is preferable to add 40 to 80 kg of ordinary Portland cement per 1 m 2 of the high water content soil. If the amount is small, the strength is insufficient. If the amount of addition is excessive, moisture tends to be insufficient and the effect of the granulating agent tends to decrease.
【００１０】＜ニ＞粒状化工程。 次に、水溶性高分子の粉末を添加、混合、攪拌する。す
ると水溶性高分子は土粒子間の遊離水を吸って溶解しな
がら土の粒子の表面を包囲する。遊離水は擬似固定水
（吸着水）として表面に固定されるため、土の性質を大
きく変化させる。また被膜で保護された土は相互に付着
せず、攪拌によって球状に造粒される。こうして、対象
土を粒状化させることができる。水溶性高分子粉末とし
ては、カルボキシル基含有水溶性高分子を用いると、高
含水土を有効に粒状化することができる。カルボキシル
基含有水溶性高分子としてたとえば次のような物質を利
用できる。アラビアガム、カラヤガム、トラガントガ
ム、アルギン酸塩などの天然の酸性多糖類。カルボキメ
チルセルロース、カルボキシメチルハイドロキシエチル
セルロースなどの半合成の水溶性高分子物質。グアーガ
ム、ローカストビーンガムなどの中性多糖類変性物。ポ
リアクリル酸塩などの合成水溶性高分子物質。<D> Granulation step. Next, a water-soluble polymer powder is added, mixed, and stirred. Then, the water-soluble polymer surrounds the surface of the soil particles while absorbing and dissolving free water between the soil particles. Since the free water is fixed on the surface as pseudo-fixed water (adsorbed water), it greatly changes the properties of the soil. Further, the soil protected by the coating does not adhere to each other, and is granulated into a spherical shape by stirring. Thus, the target soil can be granulated. When a carboxyl group-containing water-soluble polymer is used as the water-soluble polymer powder, highly hydrous soil can be effectively granulated. For example, the following substances can be used as the carboxyl group-containing water-soluble polymer. Natural acidic polysaccharides such as gum arabic, gum karaya, gum tragacanth, and alginates. Semi-synthetic water-soluble polymer substances such as carboxymethylcellulose and carboxymethylhydroxyethylcellulose. Modified neutral polysaccharides such as guar gum and locust bean gum. Synthetic water-soluble polymer substances such as polyacrylates.
【００１１】＜ホ＞被覆工程。 次に、この粒状化した土に生石灰などの水硬性無機質材
を添加する。すると前工程で土粒子の表面を被覆した水
硬性材料と、新たに添加した水硬性無機質材とが反応し
て水に溶けなくなる。こうして表面が溶解しにくい粒状
体を形成することができる。さらに水硬性無機質材は水
と反応して発熱し、水分を蒸発させる。その上にポゾラ
ン反応によって粒状化土粒子の強度を高める効果があ
る。<E> Coating step. Next, a hydraulic inorganic material such as quicklime is added to the granulated soil. Then, the hydraulic material that has coated the surface of the soil particles in the previous step reacts with the newly added hydraulic inorganic material to become insoluble in water. In this way, a granular material whose surface is difficult to dissolve can be formed. Further, the hydraulic inorganic material generates heat by reacting with water, and evaporates water. In addition, the pozzolanic reaction has the effect of increasing the strength of the granulated soil particles.
【００１２】＜ヘ＞養生。 以上のような工程によって製造した被覆粒子を一定時
間、養生する。その結果、より硬度の大きい地盤改良材
を製造することができる。<F> Curing. The coated particles produced by the above steps are cured for a certain period of time. As a result, a ground improvement material having higher hardness can be manufactured.
【００１３】＜ト＞用途。 建設発生土を上記の工程で粒状体として製造し、その粒
状体を液状化対策工などの地盤改良材として利用する。
あるいは動的締め固め工法、静的締め固め工法、ドレー
ン工法、サンドマット工法などの各種の公知の工法に利
用することができる。<G> Applications. The soil generated from construction is produced as a granular material in the above-mentioned process, and the granular material is used as a ground improvement material for liquefaction countermeasures.
Alternatively, it can be used for various known methods such as a dynamic compaction method, a static compaction method, a drain method, and a sand mat method.
【００１４】＜チ＞実施例。 建設工事現場で発生した有楽町層土（含水比１００％程
度）にまず水硬性材としてポルトランドセメントを重量
比で３％添加した。これに粒状化材として水溶性高分子
を０．２〜１％添加して攪拌混合して粒状化させた。次
に石などの大塊を除去した後、水硬性無機材として生石
灰５０〜１００ｋｇを添加して表面を被覆し、粒径５ｍ
ｍ以下の粒状体を形成した。その後７日間自然養生し
て、地盤改良材を製造した。この地盤改良材を用いて室
内突き固め試料によるCBR試験値として４６％の強度が
得られた。図２に本発明の工程によって製造した改良材
と、改良前の粒度分布を比較する。この図２から、透水
性が向上し、砂状物質としての性質を有すために運搬時
の問題、仮置きの問題、締め固め特性などが大きく改善
されていることが分かる<H> Embodiment. First, 3% by weight of Portland cement as a hydraulic material was added to the Yurakucho layer soil (water content: about 100%) generated at the construction site. To this, 0.2-1% of a water-soluble polymer was added as a granulating material, followed by stirring and mixing to granulate. Next, after removing large lumps such as stones, 50 to 100 kg of quick lime is added as a hydraulic inorganic material to cover the surface, and the particle size is 5 m.
m or less granules were formed. Thereafter, natural curing was performed for 7 days to produce a ground improvement material. Using this soil improvement material, a strength of 46% was obtained as a CBR test value using a tamped sample in a room. FIG. 2 compares the improved material produced by the process of the present invention with the particle size distribution before the improvement. From FIG. 2, it can be seen that the water permeability is improved, and the material has properties as a sand-like substance, so that problems during transportation, problems with temporary storage, compaction characteristics, etc. are greatly improved.
【００１５】[0015]
【本発明の効果】本発明の地盤改良材は上記のような工
程で製造したものであるから、次のような効果を期待す
ることができる。 ＜イ＞環境に害のない水溶性高分子と無機質である水硬
性材料を用いた製造方法である。したがって周囲の環境
に有害な影響を与えることがない。 ＜ロ＞低コストで簡易な操作によって発生土を粒状固化
して、安定した品質の改良材を製造することができる。
したがって建設発生土を有効に利用することができる。 ＜ハ＞特に本発明の方法で製造した改良材は、ここ数年
需要が高まっている動的締め固め工法、静的締め固め工
法などの液状化対策工法にも利用できる品質を備えてい
る。 ＜ニ＞前記したように、高含水比土に直接、水溶性高分
子を添加すると、粒状化した土の強度は上がらない。し
たがって養生後の仮置きの問題、締め固め特性などが改
善できない。しかし本発明の方法を採用すれば、図２に
示すように透水性が向上し、砂状物質としての性質を有
すために運搬時の問題、仮置きの問題、締め固め特性な
どが大きく改善されていることが分かる。[Effect of the present invention] The ground improvement material of the present invention is manufactured by the above-described steps, and therefore the following effects can be expected. <A> This is a production method using a water-soluble polymer that is harmless to the environment and a hydraulic material that is inorganic. Therefore, it does not adversely affect the surrounding environment. <B> It is possible to produce an improved material of stable quality by solidifying the generated soil granularly by a simple operation at low cost.
Therefore, the soil generated from construction can be used effectively. <C> In particular, the improved material produced by the method of the present invention has a quality that can be used in liquefaction countermeasures such as dynamic compaction and static compaction, which have been in demand for several years. <D> As described above, if the water-soluble polymer is added directly to the high water content soil, the strength of the granulated soil does not increase. Therefore, problems such as temporary storage after compaction and compaction characteristics cannot be improved. However, by employing the method of the present invention, as shown in FIG. 2, the water permeability is improved, and the material has properties as a sandy substance, so that problems in transportation, temporary storage, compaction characteristics, etc. are greatly improved. You can see that it is done.
【図１】 本発明の製造方法の工程の説明図。FIG. 1 is an explanatory view of the steps of the manufacturing method of the present invention.
【図２】 改良前と後の粒径の加積曲線。FIG. 2 is an accumulation curve of particle diameter before and after improvement.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） // Ｃ０９Ｋ 103:00 Ｃ０９Ｋ 103:00 (72)発明者 藤原 斉郁 東京都新宿区西新宿一丁目25番１号 大成 建設株式会社内 (72)発明者 石井 裕泰 東京都新宿区西新宿一丁目25番１号 大成 建設株式会社内 Ｆターム(参考） 2D040 AA00 AB07 BA11 CA01 CA10 CB03 CD07 4H026 CA01 CA02 CA06 CC06 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme court ゛ (Reference) // C09K 103: 00 C09K 103: 00 (72) Inventor Yoshifumi Fujiwara 1-25 Nishishinjuku, Shinjuku-ku, Tokyo No. 1 Taisei Corporation (72) Inventor Hiroyasu Ishii 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo F-term (reference) 2D040 AA00 AB07 BA11 CA01 CA10 CB03 CD07 4H026 CA01 CA02 CA06 CC06
Claims (3)
添加、混合、攪拌し、 次に、水溶性高分子の粉末を添加、混合、攪拌して粒状
化させ、 次に、この粒状化した土の表面に水硬性無機質材を添加
して粒状体の表面を被覆し次に、養生することによって
製造する、 地盤改良材の製造方法。1. A hydraulic material such as cement is added to a target soil, mixed and stirred, and then a powder of a water-soluble polymer is added, mixed and stirred to granulate. A method for producing a ground improvement material, comprising: adding a hydraulic inorganic material to the surface of a soil that has been converted, coating the surface of the granular material, and then curing the granular material.
が２ｋｇｆ／ｃｍ2以上のものとし、 添加する水硬性材を１ｍ2当たり４０ｋｇから８０ｋｇ
とした、 請求項１記載の地盤改良材の製造方法。3. The target soil has a water content ratio from the plastic limit to the liquid limit, or is equal to or higher than the liquid limit, and qc (cone penetration strength).
Is 2 kgf / cm 2 or more, and the added hydraulic material is 40 kg to 80 kg per 1 m 2.
The method for producing a ground improvement material according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000273329A JP4615687B2 (en) | 2000-09-08 | 2000-09-08 | Method for manufacturing ground improvement material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000273329A JP4615687B2 (en) | 2000-09-08 | 2000-09-08 | Method for manufacturing ground improvement material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002080849A true JP2002080849A (en) | 2002-03-22 |
| JP4615687B2 JP4615687B2 (en) | 2011-01-19 |
Family
ID=18759292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000273329A Expired - Fee Related JP4615687B2 (en) | 2000-09-08 | 2000-09-08 | Method for manufacturing ground improvement material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4615687B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018168628A (en) * | 2017-03-30 | 2018-11-01 | 三菱マテリアル株式会社 | Manufacturing method of granulated soil and method for granulating swelling portion using the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0617052A (en) * | 1992-06-29 | 1994-01-25 | Tokyo Kankyo Service Kk | Method for amending water-containing soil |
| JPH10286600A (en) * | 1997-04-17 | 1998-10-27 | Taisei Corp | Mud-treatment method |
| JPH1110197A (en) * | 1997-06-23 | 1999-01-19 | Nippon Shokubai Co Ltd | Solidification treatment method of construction sludge |
-
2000
- 2000-09-08 JP JP2000273329A patent/JP4615687B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0617052A (en) * | 1992-06-29 | 1994-01-25 | Tokyo Kankyo Service Kk | Method for amending water-containing soil |
| JPH10286600A (en) * | 1997-04-17 | 1998-10-27 | Taisei Corp | Mud-treatment method |
| JPH1110197A (en) * | 1997-06-23 | 1999-01-19 | Nippon Shokubai Co Ltd | Solidification treatment method of construction sludge |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018168628A (en) * | 2017-03-30 | 2018-11-01 | 三菱マテリアル株式会社 | Manufacturing method of granulated soil and method for granulating swelling portion using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4615687B2 (en) | 2011-01-19 |
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