JP2002327432A - Wet ground improvement method - Google Patents
Wet ground improvement methodInfo
- Publication number
- JP2002327432A JP2002327432A JP2001134770A JP2001134770A JP2002327432A JP 2002327432 A JP2002327432 A JP 2002327432A JP 2001134770 A JP2001134770 A JP 2001134770A JP 2001134770 A JP2001134770 A JP 2001134770A JP 2002327432 A JP2002327432 A JP 2002327432A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- milk
- mortar
- ground
- soil
- 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.)
- Pending
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、湿式地盤改良工法
に関する。さらに詳しくは、表層の軟弱地盤を固化処理
し、構造物の基礎地盤や路床に適した強度を有する地盤
に改良する工法に関する。The present invention relates to a wet ground improvement method. More specifically, the present invention relates to a method of solidifying a soft ground on a surface layer to improve the ground to a strength suitable for a foundation ground or a subgrade of a structure.
【０００２】[0002]
【従来の技術】従来の地盤改良工法は、いわゆる乾式工
法と呼ばれるものであった。この乾式工法では、粉末あ
るいは粒状のセメント系固化材を、軟弱土に散布して混
合し、その後土盤を整地、転圧する手法をとっている。
セメント系固化材が軟弱土盤を強化できる技術的根拠
は、つぎのとおりである。固化材成分の水和発熱反応に
より、土の含水比を低下させると共に粘土粒子を凝集・
団粒化し、コンシステンシー特性を改善し、締め固め効
果も増大させる。、またその発熱反応が他の自硬性成分
に有効に働くため、早期に強度を確保でき、さらに、膨
張吸水作用と自硬作用が同時進行し、改良度の密度の増
大と圧密効果が期待できる。2. Description of the Related Art A conventional ground improvement method is a so-called dry method. In this dry method, powder or granular cement-based solidified material is sprayed and mixed on soft soil, and then the ground is leveled and compacted.
The technical basis that cement-based solidification material can strengthen the soft ground is as follows. Due to the exothermic reaction of hydration of the solidifying component, the water content of the soil is reduced and the clay particles are aggregated
Aggregates, improves consistency properties and increases compaction effect. In addition, since the exothermic reaction effectively works on other self-hardening components, the strength can be secured at an early stage, and further, the expansion water absorption action and the self-hardening action proceed simultaneously, so that an increase in the density of improvement and a consolidation effect can be expected. .
【０００３】[0003]
【発明が解決しようとする課題】ところで、前記乾式工
法によると、有害重金属である六価クロムが土中に溶出
するという問題がある。すなわち、セメント系固化材の
主成分は、セメントの成分と石灰であり、それらに六価
クロムが含まれている。セメントは砂と水で練ってコン
クリートとした場合は、セメントの被覆が破れないので
あるが、土に混ぜて攪拌した場合はセメント粒子の被覆
が破れて、内部の成分が土中の水に溶けて流れ出してし
まうからである。この六価クロムは強い酸性を有し人体
に大きな悪影響を与えるものであるが、これが土中に溶
出すると、雨水を経由して川に流れ、飲料水に混じる危
険性があるので、現状の乾式工法は乾式汚染防止上重大
な課題である。また、乾いた状態のセメント固化材を上
面に散布する際に、風で周辺に飛び散り粉塵公害の原因
ともなっている。However, according to the dry method, there is a problem that hexavalent chromium, which is a harmful heavy metal, is eluted into the soil. That is, the main components of the cement-based solidifying material are the cement component and lime, which contain hexavalent chromium. If cement is mixed with sand and water to make concrete, the cement coating will not break.However, if mixed with soil and agitated, the coating of the cement particles will break and the internal components will dissolve in the water in the soil. Because it flows out. This hexavalent chromium has a strong acidity and has a serious adverse effect on the human body.However, if this hexavalent chromium elutes into the soil, it can flow into the river via rainwater and mix with drinking water. The construction method is a major issue in preventing dry pollution. In addition, when the dry cement-hardened material is sprayed on the upper surface, it is scattered around by the wind and causes dust pollution.
【０００４】本発明は上記実情に鑑み、六価クロムの溶
出を起こさず、粉塵公害も発生させないようにした土盤
改良工法を提供することを目的とする。[0004] In view of the above circumstances, an object of the present invention is to provide a soil improvement method that does not cause dissolution of hexavalent chromium and does not cause dust pollution.
【０００５】[0005]
【課題を解決するための手段】請求項１の湿式地盤改良
工法は、セメント系固化材と溶質防止材を水で混合して
ミルクモルタルを作り、このミルクモルタルを軟弱地盤
上に散布し、散布されたミルクモルタルを土と混合し、
ミルクモルタルが混合された土壌を整地して転圧するこ
とを特徴とする。請求項２の湿式地盤改良工法は、請求
項１記載の発明において、前記溶質防止材が、アクリル
アニオンポリマーであることを特徴とする。請求項３の
湿式地盤改良工法は、請求項１記載の発明において、攪
拌容器と散布機を搭載した車両を用い、車両の走行中に
攪拌容器内で前記ミルクモルタルを作り、現場到着後に
散布機で前記ミルクモルタルを現場の地盤上に散布する
ことを特徴とする。According to a first aspect of the present invention, there is provided a wet ground improvement method comprising mixing a cement-based solidifying material and a solute preventive material with water to make milk mortar, and spraying the milk mortar on soft ground. Mix the milk mortar with the soil,
It is characterized by leveling and compacting soil mixed with milk mortar. The wet ground improvement method according to claim 2 is characterized in that, in the invention according to claim 1, the solute preventing material is an acrylic anion polymer. According to a third aspect of the present invention, there is provided a wet ground improvement method according to the first aspect, wherein the milk mortar is formed in the stirring container while the vehicle is running, using a vehicle equipped with a stirring container and a sprayer. And spraying the milk mortar on the ground at the site.
【０００６】請求項１の発明によれば、セメント系固化
材に溶質防止材を混入してミルクモルタル化すると、セ
メント系固化材が溶質防止材で被覆されるので、土中の
水分に溶けることがない。よって、土中にセメント系固
化材中の六価クロムが溶出するといった環境汚染を防止
できる。また、セメント系固化材が粉の状態でなく液状
化しているので、粉塵が発生しない。請求項２の発明に
よれば、アクリルアニオンポリマーが溶質防止材として
の性能が高いので、地盤の強化が効率的に行われる。請
求項３の発明によれば、ミルクモルタル化作業が車両の
走行中に行えるので、現場ではミルクモルタルを散布す
るだけであり、作業時間を短縮することが可能となる。According to the first aspect of the present invention, when the solute preventing material is mixed with the cement-based solidifying material to form milk mortar, the cement-based solidifying material is covered with the solute-preventing material, so that the cement-based solidifying material is dissolved in the moisture in the soil. There is no. Therefore, it is possible to prevent environmental pollution such as leaching of hexavalent chromium in the cement-based solidified material into the soil. Further, since the cement-based solidification material is not in a powder state but in a liquefied state, no dust is generated. According to the second aspect of the present invention, since the acrylic anionic polymer has high performance as a solute preventing material, the ground is efficiently reinforced. According to the third aspect of the present invention, since the milk mortaring operation can be performed while the vehicle is running, it is only necessary to spray the milk mortar on site, and the operation time can be reduced.
【０００７】[0007]
【発明の実施の形態】つぎに、本発明の湿式地盤改良工
法の一実施形態を説明する。まず、セメント固化材と溶
質防止材であるアクリルアニオンポリマーを水で混合し
て、ミルクモルタルを作る。セメント固化材は、公知の
ものが用いられ、例えば、宇部三菱セメント株式会社製
の商品名コースタビラーがある。溶質防止材としては、
セメント固化材の分子を被覆し、内部の六価クロムの溶
出を防止できるものであればよく、どのようなものを用
いてもよいが、例えばアクリルアニオンポリマーが好適
である。このアクリルアニオンポリマー（高分子樹脂）
の一例としては、東亜合成化学工業株式会社製の商品名
「アロンAX-21」がある。Next, one embodiment of the wet ground improvement method of the present invention will be described. First, a milk mortar is made by mixing a cement solidifying material and an acrylic anion polymer as a solute preventive material with water. As the cement solidifying material, known materials are used, for example, Kobe Mitsubishi Cement Co., Ltd. trade name Costabiller. As a solute prevention material,
Any material can be used as long as it covers the molecules of the cement solidifying material and can prevent elution of hexavalent chromium inside, and any material may be used. For example, an acrylic anion polymer is preferable. This acrylic anion polymer (polymer resin)
An example is "Aron AX-21" (trade name, manufactured by Toa Gosei Chemical Industry Co., Ltd.).
【０００８】セメント固化材とアクリルアニオンポリマ
ーを水に適量配合し、混合する。その混合は、手段を問
わず利用できるが、任意の撹拌容器を車両に搭載してお
けば、現場へ向かう道中でミルクモルタルが作れるの
で、作業時間を短縮するのには好ましい。また、ミルク
モルタルの散布も、手段を問わず、どのような方法でも
利用できるが、前記した撹拌容器付の車両に散布機を取
付けておけば、車両が地盤改良現場に着くと、直ちに付
属の散布機でミルクモルタルを散布できるので、作業能
率向上のために好ましい。An appropriate amount of a cement solidifying material and an acrylic anionic polymer are blended in water and mixed. The mixing can be used irrespective of the means, but if an arbitrary stirring vessel is mounted on the vehicle, the milk mortar can be produced on the way to the site, which is preferable for shortening the working time. Spraying of milk mortar can be used in any manner, regardless of the means.If a sprayer is attached to a vehicle equipped with a stirring vessel as described above, the attached vehicle is immediately installed when the vehicle arrives at the ground improvement site. Milk mortar can be sprayed with a sprayer, which is preferable for improving work efficiency.
【０００９】上記のミルクモルタルを軟弱地盤上に散布
した後は、その部分の上を混合する。これによりミルク
モルタルが土と混じりあう。混合する手段は何でもよい
が、ドックホーその他の土木機械を用いれば効率よく行
える。ミルクモルタルが混じり合った土は、セメント系
固化材によって結合力が強化され、強固な地盤に改良さ
れる。またセメント系固化材の分子はアクリルアニオン
ポリマーで被覆されるので、土中の水分によって内部の
六価クロムが溶出することはない。よって、水質汚染等
の問題を起こすことがない。なお、ミルクモルタルを混
合した後の土盤の整地・転圧は、従来と同様の土木機械
を用いて行うことができる。[0009] After the above milk mortar is sprayed on soft ground, the above portion is mixed. This causes the milk mortar to mix with the soil. Although any mixing means can be used, it can be efficiently performed by using a dockhoe or other civil engineering machine. The soil in which milk mortar is mixed is strengthened by cement-based solidifying material, and is improved into a firm ground. Further, since the molecules of the cement-based solidifying material are covered with the acrylic anionic polymer, the hexavalent chromium inside does not elute due to the moisture in the soil. Therefore, there is no problem such as water pollution. The ground leveling and compaction of the ground after mixing the milk mortar can be performed using a conventional civil engineering machine.
【００１０】[0010]
【発明の効果】請求項１の発明によれば、セメント系固
化材に溶質防止材を混入してミルクモルタル化すると、
セメント系固化材が溶質防止材で被覆されるので、土中
の水分に溶けることがない。よって、土中にセメント系
固化材中の六価クロムが溶出するといった環境汚染を防
止できる。また、セメント系固化材が粉の状態でなく液
状化しているので、粉塵が発生しない。請求項２の発明
によれば、アクリルアニオンポリマーが溶質防止材とし
ての性能が高いので、地盤の強化が効率的に行われる。
請求項３の発明によれば、ミルクモルタル化作業が車両
の走行中に行えるので、現場ではミルクモルタルを散布
するだけであり、作業時間を短縮することが可能とな
る。According to the first aspect of the present invention, when a solute preventing material is mixed into a cement-based solidified material to form milk mortar,
Since the cement-based solidifying material is covered with the solute preventing material, it does not dissolve in the soil moisture. Therefore, it is possible to prevent environmental pollution such as leaching of hexavalent chromium in the cement-based solidified material into the soil. Further, since the cement-based solidification material is not in a powder state but in a liquefied state, no dust is generated. According to the second aspect of the present invention, since the acrylic anionic polymer has high performance as a solute preventing material, the ground is efficiently reinforced.
According to the third aspect of the present invention, since the milk mortaring operation can be performed while the vehicle is running, it is only necessary to spray the milk mortar on site, and the operation time can be reduced.
Claims (3)
してミルクモルタルを作り、このミルクモルタルを軟弱
地盤上に散布し、散布されたミルクモルタルを土と混合
し、ミルクモルタルが混合された土壌を整地して転圧す
ることを特徴とする湿式地盤改良工法。1. A milk mortar is prepared by mixing a cement-based solidifying material and a solute preventive material with water, the milk mortar is sprayed on soft ground, the sprayed milk mortar is mixed with soil, and the milk mortar is mixed. A wet ground improvement method characterized by leveling and rolling compacted soil.
マーであることを特徴とする請求項１記載の湿式地盤改
良工法。2. The wet ground improvement method according to claim 1, wherein said solute preventing material is an acrylic anionic polymer.
車両の走行中に攪拌容器内で前記ミルクモルタルを作
り、現場到着後に散布機で前記ミルクモルタルを現場の
地盤上に散布することを特徴とする請求項１記載の湿式
地盤改良工法。3. A vehicle equipped with a stirring vessel and a sprayer,
The wet ground improvement method according to claim 1, wherein the milk mortar is formed in a stirring vessel while the vehicle is running, and the milk mortar is sprayed on the ground at the site by a sprayer after arriving at the site.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001134770A JP2002327432A (en) | 2001-05-02 | 2001-05-02 | Wet ground improvement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001134770A JP2002327432A (en) | 2001-05-02 | 2001-05-02 | Wet ground improvement method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002327432A true JP2002327432A (en) | 2002-11-15 |
Family
ID=18982384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001134770A Pending JP2002327432A (en) | 2001-05-02 | 2001-05-02 | Wet ground improvement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002327432A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06100343A (en) * | 1992-09-18 | 1994-04-12 | Nippon Solid Co Ltd | Cement additive composition |
| JPH0718663A (en) * | 1993-06-30 | 1995-01-20 | Okasan Kiko Kk | Ground hardening method for ground surface and manufacturing device for ground hardening material |
| JPH07136612A (en) * | 1993-11-15 | 1995-05-30 | Pioneer Kogyo Kk | Incineration ash of general waste |
| WO1996009902A1 (en) * | 1994-09-29 | 1996-04-04 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Waste treatment chemical and waste disposal method |
| JPH10235316A (en) * | 1997-02-25 | 1998-09-08 | Chichibu Onoda Cement Corp | Prevention of hexavalent chromium elution |
| JP2000308863A (en) * | 1999-04-26 | 2000-11-07 | Tokuyama Corp | Elution preventing method |
-
2001
- 2001-05-02 JP JP2001134770A patent/JP2002327432A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06100343A (en) * | 1992-09-18 | 1994-04-12 | Nippon Solid Co Ltd | Cement additive composition |
| JPH0718663A (en) * | 1993-06-30 | 1995-01-20 | Okasan Kiko Kk | Ground hardening method for ground surface and manufacturing device for ground hardening material |
| JPH07136612A (en) * | 1993-11-15 | 1995-05-30 | Pioneer Kogyo Kk | Incineration ash of general waste |
| WO1996009902A1 (en) * | 1994-09-29 | 1996-04-04 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Waste treatment chemical and waste disposal method |
| JPH10235316A (en) * | 1997-02-25 | 1998-09-08 | Chichibu Onoda Cement Corp | Prevention of hexavalent chromium elution |
| JP2000308863A (en) * | 1999-04-26 | 2000-11-07 | Tokuyama Corp | Elution preventing method |
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