JPH0959621A - Ground improvement agent - Google Patents
Ground improvement agentInfo
- Publication number
- JPH0959621A JPH0959621A JP7234806A JP23480695A JPH0959621A JP H0959621 A JPH0959621 A JP H0959621A JP 7234806 A JP7234806 A JP 7234806A JP 23480695 A JP23480695 A JP 23480695A JP H0959621 A JPH0959621 A JP H0959621A
- Authority
- JP
- Japan
- Prior art keywords
- ground
- acrylate
- azobis
- aqueous solution
- azo compound
- 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、アクリル酸多価金
属塩及び親水基を有するアゾ化合物の水溶液からなるア
クリルポリマー系の地盤改良剤、特に地盤の液状化防止
のために有用な地盤改良剤に関するものであり、土木・
建設の技術分野において有用なものである。TECHNICAL FIELD The present invention relates to an acrylic polymer-based ground improvement agent comprising an aqueous solution of a polyvalent metal salt of acrylic acid and an azo compound having a hydrophilic group, particularly a ground improvement agent useful for preventing liquefaction of the ground. It is about civil engineering
It is useful in the technical field of construction.
【０００２】[0002]
【従来の技術】軟弱地盤を改良する目的で、従来より使
用されている地盤改良剤としては、セメント系や水ガラ
ス系の地盤改良剤が知られている。 又、止水等の特殊用
途には、ウレタン系の地盤改良剤やレドックス触媒とア
クリル酸多価金属塩水溶液とからなるアクリルポリマー
系の地盤改良剤が使用されている。2. Description of the Related Art Cement-based or water glass-based ground improvement agents are known as ground improvement agents conventionally used for the purpose of improving soft ground. For special applications such as water stoppage, urethane-based ground improvement agents and acrylic polymer-based ground improvement agents composed of a redox catalyst and an acrylic acid polyvalent metal salt aqueous solution are used.
【０００３】[0003]
【発明が解決しようとする課題】これまでに地盤改良剤
として使用されている水ガラス系、セメント系、ウレタ
ン系及びアクリルポリマー系の地盤改良剤は、数秒から
数時間でゲル化する。ところで、地盤の液状化防止等を
目的とした工法の場合、地盤中に広範囲に渡って均一に
地盤改良剤を注入する必要がある。 そのためには、地盤
改良剤が長時間にわたってゲル化しないで地盤中に浸透
した後ゲル化し、そのゲルは十分なゲル強度を有する必
要があるが、従来の地盤改良剤では、比較的短時間でゲ
ル化してしまうためこの要求を満たすことはできず、地
盤の液状化防止の用途には十分な性能を有するものでは
なかった。又、アクリルポリマー系の地盤改良剤におい
て、ゲル化時間を遅くするため、レドックス触媒の含有
量を少なくした地盤改良剤も考えられるが、この地盤改
良剤は、一部がゲル化するのみか、或いは全くゲル化し
ない場合があり、液状化防止の用途には使用し難いもの
であった。The water glass-based, cement-based, urethane-based, and acrylic polymer-based ground improving agents that have been used as ground improving agents have gelled in a few seconds to a few hours. By the way, in the case of a construction method for preventing the liquefaction of the ground, it is necessary to uniformly inject the ground improving agent into the ground over a wide range. For that purpose, the ground improving agent does not gel for a long time and then gels after penetrating into the ground, and the gel needs to have sufficient gel strength, but in the conventional ground improving agent, it takes a relatively short time. This requirement cannot be satisfied because it gels, and it does not have sufficient performance for the purpose of preventing liquefaction of the ground. Further, in the acrylic polymer-based ground improving agent, in order to delay the gelling time, a ground improving agent having a reduced content of the redox catalyst may be considered, but this ground improving agent only partially gels, Alternatively, it may not gel at all and is difficult to use for the purpose of preventing liquefaction.
【０００４】[0004]
【課題を解決するための手段】本発明者等は、上記課題
を解決するため鋭意検討した結果、長いゲル化時間（１
日以上）を有する地盤改良剤を提供するためには、アク
リル酸多価金属塩とこの重合触媒としての特定の化合物
からなる地盤改良剤が極めて有効であることを見い出
し、本発明を完成するに至った。即ち、本発明はアクリ
ル酸多価金属塩及び親水基を有するアゾ化合物の水溶液
からなる地盤改良剤である。以下、本発明を詳細に説明
する。Means for Solving the Problems The inventors of the present invention have made extensive studies to solve the above problems, and as a result, have found that a long gelation time (1
In order to provide a ground improvement agent having a period of 1 day or more), it was found that a ground improvement agent composed of a polyvalent metal salt of acrylic acid and a specific compound as the polymerization catalyst is extremely effective, and the present invention is completed. I arrived. That is, the present invention is a ground improvement agent comprising an aqueous solution of a polyvalent metal salt of acrylic acid and an azo compound having a hydrophilic group. Hereinafter, the present invention will be described in detail.
【０００５】[0005]
○アクリル酸多価金属塩 本発明の地盤改良剤では、アクリル酸多価金属塩を使用
する。１価のアクリル酸金属塩を使用する場合には、架
橋点を持たないためにその重合物は水溶性となってしま
い、 地盤改良剤として利用できない。 アクリル酸多価金
属塩としては、種々の化合物が使用でき、アクリル酸マ
グネシウム、アクリル酸亜鉛、アクリル酸ニッケル及び
アクリル酸アルミニウム等がある。これらの中でも、得
られるゲルの強度が優れ、又得られるゲルのｐＨがほぼ
中性を示し、取扱いが容易であるうことから、アクリル
酸マグネシウムが好ましい。Acrylic acid polyvalent metal salt In the ground improvement agent of the present invention, an acrylic acid polyvalent metal salt is used. When a monovalent metal acrylate is used, the polymer is water-soluble because it has no crosslinking points and cannot be used as a ground improvement agent. Various compounds can be used as the acrylic acid polyvalent metal salt, and examples thereof include magnesium acrylate, zinc acrylate, nickel acrylate, and aluminum acrylate. Among these, magnesium acrylate is preferable because the obtained gel has excellent strength, and the obtained gel has a substantially neutral pH and is easy to handle.
【０００６】地盤改良剤中のアクリル酸多価金属塩の濃
度としては、１７〜３５重量％が好ましく、より好まし
くは２８〜３５重量％である。アクリル酸多価金属塩の
濃度の濃度が１７重量％に満たない場合は、充分なゲル
強度が得られないことがあり、他方３５重量％を越える
場合には、粘度が高くなりすぎ取扱いにくくなったり、
ゲル化時間が速くなりすぎることがある。The concentration of the polyvalent metal salt of acrylic acid in the ground improvement agent is preferably 17 to 35% by weight, more preferably 28 to 35% by weight. If the concentration of the polyvalent metal salt of acrylic acid is less than 17% by weight, sufficient gel strength may not be obtained. On the other hand, if it exceeds 35% by weight, the viscosity becomes too high and handling becomes difficult. Or
The gel time may be too fast.
【０００７】○親水基を有するアゾ化合物 本発明では、アクリル酸多価金属塩を重合させる触媒と
して、親水基を有するアゾ化合物（以下単にアゾ化合物
という）を使用する。本発明で使用するアゾ化合物は、
次の優れた特長を有する。 １）地盤中の温度領域におけるラジカルの発生濃度が低
く、かつ長時間にわたって一定濃度で分解する。しかも
ゲル化終了時においても、半減期に達しておらず、安定
した触媒活性を保持する。 ２）分子中に親水基を有するため、アクリル酸多価金属
塩水溶液に対して１０-2ｍｏｌ／Ｌ以上の溶解性を有し
ており、重合触媒として十分な相溶性を有している。 ３）レドックス触媒を使用した場合では、地盤中の金属
イオンとの反応によりゲル化時間が早くなるが、アゾ化
合物は金属イオンと反応しないため、ゲル化時間が早く
なることはなく、地盤中でも安定したゲル化時間が得ら
れる。Azo Compound Having Hydrophilic Group In the present invention, an azo compound having a hydrophilic group (hereinafter simply referred to as an azo compound) is used as a catalyst for polymerizing a polyvalent metal salt of acrylic acid. The azo compound used in the present invention is
It has the following excellent features. 1) The concentration of radicals generated in the temperature range in the ground is low and decomposes at a constant concentration for a long time. Moreover, even at the end of gelation, the half-life is not reached and stable catalyst activity is retained. 2) Since it has a hydrophilic group in the molecule, it has a solubility of 10 -2 mol / L or more in an aqueous solution of a polyvalent metal salt of acrylic acid, and has a sufficient compatibility as a polymerization catalyst. 3) When a redox catalyst is used, the gelling time is shortened due to the reaction with the metal ions in the ground, but the azo compound does not react with the metal ions, so the gelling time is not shortened and stable even in the ground. The gelling time obtained is obtained.
【０００８】アゾ化合物において、親水基としては、ア
ミノ基、水酸基及びカルボキシル基がある。アミノ基を
有するアゾ化合物としては、アゾアミジン及び環状アゾ
アミジン等があり、その例としては、２，２’−アゾビ
ス〔２−（イミダゾリン−２−イル) プロパン〕、２，
２’−アゾビス〔２−（イミダゾリン−２−イル）プロ
パン〕ジヒドロクロリド、２，２’−アゾビス（２−メ
チルプロピオンアミジン）ジヒドロクロリド及び２，
２’−アゾビス〔２−（５−メチル−２−イミダゾリン
−２−イル）プロパン〕ジヒドロクロリド等がある。水
酸基を有するアゾ化合物の例としては、２，２’−アゾ
ビス〔２−メチル−Ｎ−（２−ヒドロキシエチル）プロ
ピオンアミド〕等が挙げられ、カルボキシル基を有する
アゾ化合物としては４，４’−アゾビス（４−シアノバ
レロ酸）等がある。これらのアゾ化合物中でも、水溶液
中での活性化エネルギーが２５〜３５kcal/molのもの
が、液状化防止の目的のための好ましいゲル化時間を得
ることができるため好ましく、具体的には２，２’−ア
ゾビス〔２−（イミダゾリン−２−イル）プロパン] 、
２，２’−アゾビス〔２−（イミダゾリン−２−イル）
プロパン〕ジヒドロクロリド等がある。しかも、これら
のアゾ化合物は、地盤中のｐＨの違いによっても、反応
の阻害を受けないという点でも好ましい。In the azo compound, the hydrophilic group includes an amino group, a hydroxyl group and a carboxyl group. Examples of the azo compound having an amino group include azoamidine and cyclic azoamidine, and examples thereof include 2,2′-azobis [2- (imidazolin-2-yl) propane], 2,
2'-azobis [2- (imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis (2-methylpropionamidine) dihydrochloride and 2,
2'-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride and the like. Examples of the azo compound having a hydroxyl group include 2,2'-azobis [2-methyl-N- (2-hydroxyethyl) propionamide], and the azo compound having a carboxyl group is 4,4'-. There are azobis (4-cyanovaleroic acid) and the like. Among these azo compounds, those having an activation energy in an aqueous solution of 25 to 35 kcal / mol are preferable because a preferable gelling time for the purpose of preventing liquefaction can be obtained, and specifically, 2,2 '-Azobis [2- (imidazolin-2-yl) propane],
2,2'-azobis [2- (imidazolin-2-yl)
Propane] dihydrochloride and the like. Moreover, these azo compounds are preferable in that the reaction is not inhibited even by the difference in pH in the ground.
【０００９】アゾ化合物のアクリル酸多価金属塩に対す
る配合割合としては、アクリル酸多価金属塩に対してア
ゾ化合物が０．４〜５重量％であることが好ましく、よ
り好ましくは０．４〜１重量％である。この割合が0.４
重量％に満たない場合には、地盤改良剤がゲル化し難く
なったり、又得られるゲルが不均一になったりする場合
があり、他方５重量％を越えると、ゲル化速度が速す
ぎ、地盤改良剤が地盤中に十分浸透し難くなる場合があ
る。The compounding ratio of the azo compound to the polyvalent metal salt of acrylic acid is preferably 0.4 to 5% by weight, more preferably 0.4 to 5% by weight of the polyvalent metal salt of acrylic acid. It is 1% by weight. This ratio is 0.4
If the amount is less than 5% by weight, the soil improving agent may be difficult to gel, or the obtained gel may be non-uniform. On the other hand, if it exceeds 5% by weight, the gelation speed may be too fast, resulting in the soil. It may be difficult for the improver to sufficiently penetrate into the ground.
【００１０】○製造方法 本発明の地盤改良剤の製造方法としては、種々の方法が
採用でき、例えば、アクリル酸多価金属塩の水溶液にア
ゾ化合物を添加し攪拌溶解させる方法や、使用するアク
リル酸多価金属塩水溶液に対して、体積比で好ましくは
１／１０の量の水にアゾ化合物を攪拌溶解させアゾ化合
物水溶液を調製した後に、アゾ化合物水溶液とアクリル
酸金属塩水溶液とを混合する方法等がある。○ Manufacturing method Various methods can be adopted as a method for manufacturing the ground improvement agent of the present invention. For example, a method of adding an azo compound to an aqueous solution of a polyvalent metal salt of acrylic acid and dissolving with stirring, or an acrylic resin to be used. The azo compound aqueous solution is prepared by stirring and dissolving the azo compound in water in an amount of preferably 1/10 by volume with respect to the acid polyvalent metal salt aqueous solution, and then the azo compound aqueous solution and the acrylic acid metal salt aqueous solution are mixed. There are ways.
【００１１】○地盤改良工法 本発明の地盤改良剤は、一般的な注入工法により、地盤
に注入すればよい。例えば、１本の管を使用して地盤改
良剤を地盤に注入する１ショット工法、又はアクリル酸
多価金属塩水溶液を主材としアゾ化合物水溶液を硬化剤
として、二重管を使用してそれぞれを別々に供給する
１．５ショット工法、２ショット工法等があるが、通常
は１ショット工法によれば充分である。○ Ground Improvement Method The ground improvement agent of the present invention may be injected into the ground by a general injection method. For example, a one-shot method in which a ground improvement agent is injected into the ground using one tube, or an aqueous solution of acrylic acid polyvalent metal salt as a main material and an azo compound aqueous solution as a curing agent, and a double tube are used respectively. There are a 1.5-shot method, a 2-shot method, and the like, in which the above are separately supplied, but the 1-shot method is usually sufficient.
【００１２】[0012]
○実施例１〜２ アクリル酸マグネシウムの３５重量％水溶液１１５ｇ
に、アゾ化合物として、２，２’−アゾビス〔２−（イ
ミダゾリン−２−イル) プロパン〕ジヒドロクロリド
０．３２３ｇ又は０．１６１ｇを添加混合して地盤改良
剤を製造した。上記で得られた地盤改良剤の全量を、間
隙率４３％の豊浦標準砂２５０ｇに浸透させ、ゲル化に
要した時間を測定した。それらの結果を表１に示す。得
られたサンドゲルは、いずれも均一なものであった。Examples 1-2: 115 g of a 35 wt% aqueous solution of magnesium acrylate
Further, 0.323 g or 0.161 g of 2,2′-azobis [2- (imidazolin-2-yl) propane] dihydrochloride as an azo compound was added and mixed to produce a ground improvement agent. The total amount of the ground improvement agent obtained above was impregnated into 250 g of Toyoura standard sand having a porosity of 43%, and the time required for gelation was measured. Table 1 shows the results. The obtained sand gels were all uniform.
【００１３】[0013]
【表１】 １）ＡＭｇ：アクリル酸マグネシウム[Table 1] 1) Amg: magnesium acrylate
【００１４】○実施例３〜６ アクリル酸多価金属塩として、表２に示す化合物を使用
した以外は、実施例２と同様の配合量及び同様の方法に
より、地盤改良剤を製造した。得られた地盤改良剤のホ
モゲルについて、ｐＨ試験紙によりｐＨを測定した。さ
らに実施例２と同様に、地盤改良剤を豊浦標準砂に浸透
させてゲル化させ、一定期間経過後のサンドゲルについ
てJIS A 1216に準じて一軸圧縮試験を行った。それらの
結果を表２に示す。得られたサンドゲルは、いずれも均
一なものであった。Examples 3 to 6 A ground improvement agent was produced in the same amount and method as in Example 2, except that the compounds shown in Table 2 were used as the acrylic acid polyvalent metal salt. The pH of the obtained ground improvement agent homogel was measured with a pH test paper. Further, in the same manner as in Example 2, the ground improvement agent was permeated into Toyoura standard sand to cause gelation, and the sand gel after a certain period of time was subjected to a uniaxial compression test according to JIS A 1216. Table 2 shows the results. The obtained sand gels were all uniform.
【００１５】[0015]
【表２】 [Table 2]
【００１６】○比較例１〜４ アクリル酸マグネシウムの３５重量％水溶液１１５ｇ
に、レドックス触媒として過硫酸アンモニウムの１重量
％水溶液及びチオ硫酸ナトリウムの３重量％水溶液を表
３に示す量添加し、ゲル化までの時間を測定した。それ
らの結果を表３に示す。比較例１及び同２において、ゲ
ル化時間は速すぎ、しかもこれらの結果は、標準砂中に
おける結果であるため、 これらの地盤改良剤を種々の金
属イオンを含有する実際の地盤に適用した場合には、さ
らにゲル化が促進されるものと推定される。 又ゲル化時
間を遅くするため、過硫酸アンモニウム水溶液の添加量
を少なくした場合、比較例３では７０分後に一部がゲル
化するのみでそれ以降も全く状況は変わらず、又比較例
４では全くゲル化しなかった。Comparative Examples 1 to 4 115 g of 35% by weight aqueous magnesium acrylate solution
A 1 wt% aqueous solution of ammonium persulfate and a 3 wt% aqueous solution of sodium thiosulfate were added as redox catalysts in the amounts shown in Table 3, and the time until gelation was measured. The results are shown in Table 3. In Comparative Examples 1 and 2, the gelation time was too fast, and these results were obtained in standard sand. Therefore, when these ground improvement agents were applied to actual ground containing various metal ions, , It is presumed that gelation is further promoted. In addition, when the amount of ammonium persulfate aqueous solution added was reduced in order to delay the gelling time, in Comparative Example 3, after 70 minutes only a part gelled and the situation did not change after that, and in Comparative Example 4 completely. It did not gel.
【００１７】[0017]
【表３】 １）ＡＭｇ：アクリル酸マグネシウム ２）ＡＰＳ：過硫酸アンモニウム ３）ＳＴＳ：チオ硫酸ナトリウム[Table 3] 1) AMg: magnesium acrylate 2) APS: ammonium persulfate 3) STS: sodium thiosulfate
【００１８】[0018]
【発明の効果】本発明の地盤改良剤は、ゲル化時間が１
日以上と長いため、地盤中に広範囲に渡って均一に浸透
させることができ、しかも地盤中で確実にゲル化し、又
ゲル化後は長期間に渡って優れた強度を維持することが
でき、地盤の液状化防止に有用なものである。The ground improvement agent of the present invention has a gelling time of 1
Since it is longer than a day, it can be uniformly penetrated into the ground over a wide range, and it can be surely gelled in the ground, and can maintain excellent strength for a long time after gelation. It is useful for preventing liquefaction of the ground.
Claims (1)
アゾ化合物の水溶液からなる地盤改良剤。1. A ground improvement agent comprising an aqueous solution of a polyvalent metal salt of acrylic acid and an azo compound having a hydrophilic group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23480695A JP3582174B2 (en) | 1995-08-21 | 1995-08-21 | Ground improvement agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23480695A JP3582174B2 (en) | 1995-08-21 | 1995-08-21 | Ground improvement agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0959621A true JPH0959621A (en) | 1997-03-04 |
| JP3582174B2 JP3582174B2 (en) | 2004-10-27 |
Family
ID=16976690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23480695A Expired - Fee Related JP3582174B2 (en) | 1995-08-21 | 1995-08-21 | Ground improvement agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3582174B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016130416A (en) * | 2015-01-14 | 2016-07-21 | 東亞合成株式会社 | Ground injection composition for liquefaction prevention and ground improvement method using the same |
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| JPS6481886A (en) * | 1987-09-22 | 1989-03-28 | Sanyo Chemical Ind Ltd | Hydrous soil solidifying agent |
| JPH02173185A (en) * | 1988-12-27 | 1990-07-04 | Lion Corp | Soil treating agent |
| JPH0617054A (en) * | 1992-06-29 | 1994-01-25 | Mitsubishi Kasei Corp | Hydrous soil improver |
| JPH06256414A (en) * | 1993-03-09 | 1994-09-13 | Nippon Shokubai Co Ltd | Production of (meth)acrylic acid (salt) polymer |
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1995
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61117148A (en) * | 1984-11-14 | 1986-06-04 | 東亞合成株式会社 | Spray composition |
| JPS62181388A (en) * | 1986-02-06 | 1987-08-08 | Toagosei Chem Ind Co Ltd | Chemical for stabilizing ground |
| JPS63145384A (en) * | 1986-12-09 | 1988-06-17 | Toagosei Chem Ind Co Ltd | Adhesive composition |
| JPS6414418A (en) * | 1987-07-07 | 1989-01-18 | Toa Gosei Chem Ind | Ground inprovement method |
| JPS6440594A (en) * | 1987-08-07 | 1989-02-10 | Nitto Chemical Industry Co Ltd | Production of water-stopping agent |
| JPS6481886A (en) * | 1987-09-22 | 1989-03-28 | Sanyo Chemical Ind Ltd | Hydrous soil solidifying agent |
| JPH02173185A (en) * | 1988-12-27 | 1990-07-04 | Lion Corp | Soil treating agent |
| JPH0617054A (en) * | 1992-06-29 | 1994-01-25 | Mitsubishi Kasei Corp | Hydrous soil improver |
| JPH06256414A (en) * | 1993-03-09 | 1994-09-13 | Nippon Shokubai Co Ltd | Production of (meth)acrylic acid (salt) polymer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016130416A (en) * | 2015-01-14 | 2016-07-21 | 東亞合成株式会社 | Ground injection composition for liquefaction prevention and ground improvement method using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3582174B2 (en) | 2004-10-27 |
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