JP2547120B2 - Ground injection method - Google Patents
Ground injection methodInfo
- Publication number
- JP2547120B2 JP2547120B2 JP2209330A JP20933090A JP2547120B2 JP 2547120 B2 JP2547120 B2 JP 2547120B2 JP 2209330 A JP2209330 A JP 2209330A JP 20933090 A JP20933090 A JP 20933090A JP 2547120 B2 JP2547120 B2 JP 2547120B2
- Authority
- JP
- Japan
- Prior art keywords
- solution
- water
- ground
- water glass
- liquid
- 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.)
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は地盤中に特定の注入液を注入して地盤を固結
する地盤注入工法に係り、特に地下水面下の地盤中にお
ける固結性に優れ、さらに注入液のゲル化時間調整が容
易で、かつ浸透性に優れた地盤注入工法に関する。TECHNICAL FIELD The present invention relates to a ground injection method for injecting a specific injection liquid into the ground to consolidate the ground, and in particular, the consolidation property in the ground below the water table. The present invention relates to a ground pouring method which is excellent in permeability, is easy to adjust the gel time of the injection liquid, and has excellent permeability.
〔従来の技術〕 地盤固結用注入液として、従来、水ガラス水溶液に、
無機塩、有機塩あるいはグリオキザールやエステル類、
さらにはセメント等を加えてゲル化せしめる水ガラスグ
ラウトが知られている。[Prior Art] As a ground consolidation injection liquid, conventionally, a water glass aqueous solution,
Inorganic salts, organic salts or glyoxal and esters,
Furthermore, a water glass grout is known in which cement or the like is added to cause gelation.
上述において、無機塩として水溶性無機塩を用いたも
のはゲル化時間の調整にあたってわずかな無機塩量の違
いでゲル化時間が大幅に変化し、あるいはわずかに過少
であるだけで全くゲル化しないという現象が生じ、この
ため固結が不確実であった。In the above, when the water-soluble inorganic salt is used as the inorganic salt, the gelling time significantly changes due to a slight difference in the amount of the inorganic salt in adjusting the gelling time, or the gelling time does not gel at all because it is slightly too small. Phenomenon occurred, and thus the consolidation was uncertain.
また、難溶性無機塩やセメントの例では、浸透性が悪
く、さらには上述有機系の例では地下水のBODやCODを増
加させるという問題があった。In addition, in the case of a poorly soluble inorganic salt or cement, there is a problem that permeability is poor, and in the case of the above-mentioned organic system, BOD and COD of groundwater are increased.
上述の各例において、特に水溶性無機塩を用いる場
合、このゲル化を確実に行い、かつゲル化時間の調整を
容易に行なえれば極めて有用な注入液となることが期待
される。In each of the above-described examples, particularly when a water-soluble inorganic salt is used, it is expected that an extremely useful injection solution will be obtained if the gelation is performed reliably and the gelation time can be easily adjusted.
そこで、この期待を実現するために、３号水ガラスに
あらかじめNaCl、KClあるいはアルカリ土金属塩を混合
したものをＡ液とし、他の反応剤水溶液をＢ液とし、こ
れらＡ、Ｂ液を組み合わせる注入工法がが提案されてい
る。しかし、３号水ガラスにNaCl、KClあるいはアルカ
リ土金属塩を混合すると、混合液中にコロイドが急激に
形成されるため、ゲル化時間の調整がしにくいという問
題があった。Therefore, in order to realize this expectation, a mixture of No. 3 water glass with NaCl, KCl or an alkaline earth metal salt in advance is used as solution A, and another aqueous solution of the reactant is used as solution B, and these solutions A and B are combined. An injection method has been proposed. However, when No. 3 water glass is mixed with NaCl, KCl or an alkaline earth metal salt, colloids are rapidly formed in the mixed solution, which makes it difficult to adjust the gelation time.
また、水ガラスに強酸を加えて形成される酸性水ガラ
スを基本素材とし、これにアルカリ剤を加える注入工法
も知られているが、この場合、強酸を用いることによる
現場における取り扱い上の問題や、ゲル化時間が調整し
にくいという欠点を有している。Further, there is also known an injection method in which an acidic water glass formed by adding strong acid to water glass is used as a basic material, and an alkaline agent is added to this as a basic material. However, it has a drawback that it is difficult to adjust the gelling time.
さらに、水ガラスと反応剤をあらかじめ混合してなる
それ自体ゲル化し得る配合液をＡ液とし、これに反応剤
水溶液（Ｂ液）を加えてゲル化時間を調整する方法も知
られているが、これは、加水によって大幅にゲル化時間
が遅延してしまうという問題があった。Furthermore, there is also known a method in which a liquid mixture prepared by preliminarily mixing water glass and a reaction agent and capable of gelation is used as solution A, and an aqueous solution of the reaction agent (solution B) is added to adjust the gelation time. However, this had a problem that the gelation time was significantly delayed by water addition.
例えば、ゲル化時間の長いＡ液にＢ液水溶液を加えて
ゲル化時間を短縮する場合、Ｂ液の水分によってゲル化
時間が延長するため極めて多量の反応剤をＢ液中に加え
なければ効果的なゲル化時間の短縮が達成されない。そ
して、Ａ液自体も、さらにはＡ・Ｂ混合液も水で希釈さ
れて大幅にゲル化時間が延長するから、通常、地下水面
下の地盤中に注入する場合、ゲル化が大幅に遅延するの
みならず、注入液が所定個所外に逸脱してしまうという
欠点があった。For example, when the solution B is added to the solution A having a long gelation time to shorten the gelation time, the gelation time is extended by the water content of the solution B, so that it is necessary to add an extremely large amount of the reaction agent to the solution B. Reduction of the desired gel time is not achieved. Then, since the A solution itself and the A / B mixed solution are diluted with water and the gelation time is greatly extended, the gelation is usually significantly delayed when the solution is injected into the ground below the water table. In addition, there is a drawback that the injected liquid deviates from a predetermined place.
そこで、本発明の目的は地下水面下の地盤中における
固結性に優れ、さらに注入液のゲル化時間調整が容易
で、かつ浸透性に優れ、前述の公知技術に存する欠点を
改良した地盤注入工法を提供することにある。Therefore, the object of the present invention is excellent in solidification in the ground below the water table, further easy gelation time adjustment of the injectable liquid, and excellent in permeability, ground injection that has improved the drawbacks existing in the aforementioned known technology To provide a construction method.
前述の目的を達成するため、本発明によれば、水ガラ
スとアルミン酸塩を有効成分として含有するアルカリ性
配合液をまず、基本素材として調製し、次いで、この基
本素材に反応剤水溶液を添加して得られるアルカリ性注
入液を地盤中に注入することを特徴とする。In order to achieve the above-mentioned object, according to the present invention, an alkaline compounding liquid containing water glass and an aluminate as an active ingredient is first prepared as a basic material, and then an aqueous solution of a reactant is added to this basic material. It is characterized in that the alkaline injection liquid obtained by the above is injected into the ground.
本発明において、水ガラスとアルミン酸塩の配合液は
水で希釈するとゲル化時間が短縮する性質を有するもの
であり、本発明者はこの性質に着目してまず、それ自体
でゲル化し得るゲル化時間の長い水ガラス・アルミン酸
塩を有効成分とする基本素材を作液し、次いでこれに反
応剤水溶液を加えて任意のゲル化時間の注入液を調製
し、この注入液を地盤中に注入することを見いだし、本
発明を完成するに至った。In the present invention, the liquid mixture of water glass and aluminate has a property of shortening the gelling time when diluted with water, and the present inventor pays attention to this property, and first of all, a gel which can gel itself. A basic material containing water glass / aluminate, which has a long gelation time, is prepared as an active ingredient, and then an aqueous solution of a reactant is added to this to prepare an injection solution having an arbitrary gelation time, and this injection solution is placed in the ground. They found that the injection was performed, and completed the present invention.
本発明にかかる前述の基本素材に水のみを加えただけ
でもゲル化時間が短縮するが、この水に反応剤を加えれ
ば一層効果的にゲル化時間が短縮されることになる。Although the gelation time can be shortened by adding only water to the above-mentioned basic material according to the present invention, the gelation time can be more effectively shortened by adding the reaction agent to the water.
これに対して従来の方法では、水ガラスと反応剤の混
合液をＡ液として場合、これに水のみからなるＢ液を加
えて混合すると混合液の水ガラス濃度は低下するからゲ
ル化時間は大幅に延長してしまい、したがって、Ａ液の
ゲル化時間を短縮するには極めて多量の反応剤をＢ液に
混合しなくてはならない。On the other hand, in the conventional method, when the mixed solution of water glass and the reactant is used as solution A, if solution B composed of only water is added to and mixed with this solution, the water glass concentration of the mixed solution is lowered, so that the gelation time is Therefore, in order to shorten the gelation time of the liquid A, it is necessary to mix a very large amount of the reactant with the liquid B.
さらに、本発明において、基本素材は水に希釈される
とゲル化時間が短縮するので地下水面下に注入する場
合、従来の方法ではゲル化時間が延長して逸脱したり、
ゲル化が不可能になったりすることが多いのに対し、本
発明ではむしろゲル化時間が短縮して逸脱を防止でき、
所定の領域で確実に固結する。Furthermore, in the present invention, when the basic material is injected below the water table because the gelling time is shortened when diluted with water, the gelling time is extended and deviated by the conventional method,
While gelation is often impossible, in the present invention, rather gelation time can be shortened and deviation can be prevented,
Firmly solidifies in a given area.
以下、本発明を実施例によって詳述する。 Hereinafter, the present invention will be described in detail with reference to examples.
1.使用材料 水ガラス：市販３号水ガラス。モル比2.94。1. Materials used Water glass: Commercially available No. 3 water glass. The molar ratio is 2.94.
アルミン酸ソーダ水溶液:Al2O310％、Na2O20％。Aqueous sodium aluminate solution: Al 2 O 3 10%, Na 2 O 20%.
重炭酸ナトリウム:1級試薬。Sodium bicarbonate: First grade reagent.
グリオキザール：市販40％液。Glyoxal: Commercially available 40% liquid.
塩化カルシウム:1級試薬。Calcium chloride: Grade 1 reagent.
表−２から、試料番号１〜21についてはＡ液は加水に
よってゲル化時間が短縮され、４倍以上水にうすめても
ゲル化することがわかる。これに対して、試料番号22〜
30についてはＡ液は水で希釈されるとゲル化時間が大幅
に延長され、ないしは固結しないことがわかる。 From Table-2, it can be seen that, with respect to Sample Nos. 1 to 21, the gelling time was shortened due to the addition of water, and the gelling occurred even when it was diluted with water 4 times or more. On the other hand, sample number 22-
With respect to No. 30, it can be seen that when the solution A is diluted with water, the gelling time is significantly extended and the solution does not solidify.
表−３から、試料番号31、32、36〜39、46〜48、52〜
54については、Ｂ液中の反応剤量を少なく用いてゲル化
時間を効果的に調整し得ることがわかる。これに対し
て、試料番号33〜35、40〜42、43〜45については、多重
の反応剤を用いなければゲル化時間が短縮されないこと
がわかる。また、試料番号46〜48、52〜54については、
反応剤のわずかな変化によってゲル化時間が大幅に変化
するようなことがないため、ゲル化の調整が容易である
のに対し、試料番号49〜51については反応剤量のわずか
な変化によってゲル化が大幅に増減し、ゲル化の調整が
むづかしいことがわかる。 From Table-3, sample numbers 31, 32, 36-39, 46-48, 52-
As for 54, it can be seen that the gelation time can be effectively adjusted by using a small amount of the reactant in the solution B. On the other hand, for sample numbers 33 to 35, 40 to 42, and 43 to 45, it can be seen that the gelation time cannot be shortened unless multiple reagents are used. For sample numbers 46 to 48 and 52 to 54,
The gelation time is not significantly changed by a slight change in the reactant, so that the gelation can be easily adjusted. It can be seen that the gelation significantly increases and decreases, and it is difficult to adjust the gelation.
表−４から、試料番号55〜57、61〜66については、注
入液が水に希釈されるとゲル化時間が短縮されることが
わかる。このため地下水の希釈を受けても固結しなかっ
たり、逸脱したり等の心配がない。したがって、これら
を地盤中に注入した場合、注入液の外周部の希釈された
部分が早くゲル化し、時間の経過とともに内部がゲル化
するという現象が生じ、所定領域でゲル化させるための
画期的性能が発揮される。これに対して、試料番号58〜
60、67〜69の従来技術では、地下水によってゲル化が大
幅に延長し、固結性が低下される。 From Table 4, it can be seen that for sample numbers 55 to 57 and 61 to 66, the gelation time is shortened when the injection liquid is diluted with water. Therefore, there is no concern that it will not solidify or deviate even if it is diluted with groundwater. Therefore, when these are injected into the ground, the diluted portion of the outer peripheral portion of the injection liquid gels faster, and the phenomenon that the inside gels with the passage of time occurs. Performance is demonstrated. In contrast, sample number 58-
In the prior art of 60, 67-69, groundwater significantly extends gelation and reduces caking properties.
6.基本素材の特徴 表−５に示されるように、Ａ液、Ｂ液を調製し、これ
らの混合液についてゲル化時間を測定した。6. Characteristics of Basic Material As shown in Table 5, solutions A and B were prepared, and the gelation time was measured for these mixed solutions.
表−５の試料番号70〜72と表−３の試料番号52〜54を
比較すると、アルミン酸ソーダと重曹をＢ液中にあらか
じめまぜて水ガラス水溶液のＡ液と混合する従来の方法
では、わずかな反応剤量の違いによりゲル化時間が大幅
に変化するが、本発明のように基本素材にあらかじめ水
ガラス水溶液とアルミン酸ソーダを混合したそれ自体ゲ
ル化し得る配合液をＡ液として用いると、従来と同一組
成であってもゲル化時間の変化が少なく、ゲル化時間の
調製が極めて容易であることがわかる。 Comparing sample Nos. 70 to 72 in Table 5 with sample Nos. 52 to 54 in Table 3, in the conventional method in which sodium aluminate and baking soda are premixed in solution B and mixed with solution A of a water glass aqueous solution, Although the gelling time changes significantly due to a slight difference in the amount of the reactants, when a compounding liquid capable of gelling itself, which is prepared by mixing a basic material with an aqueous solution of water glass and sodium aluminate as in the present invention, is used as the liquid A. It can be seen that even if the composition is the same as the conventional one, there is little change in the gelation time, and it is extremely easy to adjust the gelation time.
また、表−３の試料番号43〜45と52〜54を比較して
も、本発明はゲル化時間の変動が少なく、ゲル化時間の
調整が容易であることがわかる。これは本発明の基本素
材中に均質でかつ安定したシリカアルミナゾルが形成さ
れるための思われる。Also, comparing sample Nos. 43 to 45 and 52 to 54 in Table 3 shows that the present invention has little fluctuation in gelation time and can easily adjust gelation time. This is believed to be due to the formation of a homogeneous and stable silica-alumina sol in the base material of the present invention.
本発明におけるアルミン酸塩とはアルミン酸ナトリウ
ム、アルミン酸カリウム、あるいはこれらと炭酸アルカ
リとの混合物を言い、さらに、アルミニウムの塩化物、
硫酸塩、塩化アルミニウム、ポリ塩化アルミニウム、硫
酸アルミニウム、みょうばん、酸化アルミニウム、水酸
化アルミニウムを苛性アルカリに溶解したものであって
もよい。The aluminate in the present invention means sodium aluminate, potassium aluminate, or a mixture of these and alkali carbonate, and further, aluminum chloride,
It may be one obtained by dissolving sulfate, aluminum chloride, polyaluminum chloride, aluminum sulfate, alum, aluminum oxide or aluminum hydroxide in caustic alkali.
また、本発明における水ガラスはモル比5.0〜0.5の粒
状または粒状水ガラス、あるいはこれらの水ガラスと苛
性アルカリや珪酸等の混合物である。The water glass in the present invention is granular or granular water glass having a molar ratio of 5.0 to 0.5, or a mixture of these water glasses and caustic alkali, silicic acid and the like.
このような本発明の具体的実施に当たっては、例えば
基本素材については現場において水ガラス水溶液とアル
ミン酸ソーダをミキサー中で急速混合して製造され、あ
るいはこれらを加圧噴射合流して部分ゲルの形成を防
ぎ、均質な配合液として製造され、また、アルカリ性注
入液については使用成分をミキサー中で急速混合して製
造され、あるいは噴射合流混合装置を用いて水ガラス液
とアルカリ液を合流混合して得られる水ガラス液にアル
ミン酸ソーダを添加し、さらに炭酸ソーダを添加混合し
て製造され、さらには水ガラス水溶液とアルミン酸ソー
ダを合流混合して得られる配合液に炭酸カルシウムを添
加混合して製造され、あるいは水ガラスと炭酸カルシウ
ムの混合液とアルミン酸ソーダ水溶液を一気に合流混合
して製造される。なお、本発明は上述のようにして製造
されたアルカリ性注入液にさらに石灰、塩化カルシウ
ム、セメント、あるいはスラグ、フライアッシュ等のポ
ゾラン、その他の任意の塩を添加して強度を増強した
り、ゲル化時間を調整してもよい。In carrying out such a specific embodiment of the present invention, for example, basic materials are manufactured by rapidly mixing an aqueous solution of water glass and sodium aluminate in a mixer in the field, or by forming a partial gel by merging them under pressure. Is produced as a homogeneous blended liquid, and the alkaline injecting liquid is produced by rapidly mixing the components used in a mixer, or by mixing and mixing the water glass liquid and the alkaline liquid using an injection merging / mixing device. Sodium aluminate is added to the obtained water glass liquid, and it is produced by adding and mixing sodium carbonate.Furthermore, calcium carbonate is added and mixed to the compounding liquid obtained by confluently mixing the water glass aqueous solution and sodium aluminate. It is manufactured, or it is manufactured by merging and mixing a mixed solution of water glass and calcium carbonate and an aqueous solution of sodium aluminate at once. The present invention further enhances the strength by adding lime, calcium chloride, cement, or slag, pozzolan such as fly ash, or any other salt to the alkaline injection liquid produced as described above, or gel. The activation time may be adjusted.
また、上述の本発明は任意の工法に応用でき、例えば
基本素材に急結性配合液を合流させて瞬結性グラウトと
して注入してのち、急結性配合液の合流を中止し、緩結
性配合液を合流させて緩結性グラウトとして注入し、瞬
結性グラウトと緩結性グラウトを組み合わせて注入する
ことができる。Further, the above-mentioned present invention can be applied to any construction method, for example, after joining the quick-setting compounding liquid to the basic material and injecting it as a quick-setting grout, the joining of the quick-setting compounding liquid is stopped, and then the loose-setting is loosened. It is possible to combine the sexual compounding solution and inject it as a slow-flowing grout, and to inject it by combining a quick-flowing grout and a slow-moving grout.
これらの配合液としては任意の酸や塩、有機反応剤
（アルデヒドやエステル等）、セメント、石灰（消石
灰、生石灰）等が用いられ、さらにアルミン酸塩の高濃
度配合液、低濃度配合液も用いられる。また、基本素在
中に任意の反応剤を添加することもできる。As these compounded liquids, any acid or salt, organic reaction agent (aldehyde or ester, etc.), cement, lime (slaked lime, quick lime), etc. are used. Furthermore, high concentration compounded solutions of aluminate and low concentration compounded solutions are also available. Used. Further, an optional reaction agent can be added to the basic substance.
以上のとおり、本発明は基本素材として水ガラスとア
ルミン酸塩を有効成分とするアルカリ性配合液を用い、
これに反応剤水溶液を添加してなる注入液を地盤中に注
入することにより、地下水面下の固結性に優れ、少量の
反応剤で効果的にゲル化時間が調整され、さらに浸透性
にも優れた注入工法であって、実用上有用な発明であ
る。As described above, the present invention uses an alkaline compounding liquid containing water glass and an aluminate as an active ingredient as a basic material,
By injecting the injectable solution obtained by adding the aqueous solution of the reactant to the ground, it has an excellent consolidation property under the water table, and the gelation time can be adjusted effectively with a small amount of the reactant, which further improves the permeability. Is an excellent injection method and is a practically useful invention.
Claims (2)
含有するアルカリ性配合液をまず、基本素材として調製
し、次いで、この基本素材に反応剤水溶液を添加して得
られるアルカリ性注入液を地盤中に注入することを特徴
とする地盤注入工法。1. An alkaline compounding solution containing water glass and an aluminate as active ingredients is first prepared as a basic material, and then an alkaline injecting solution obtained by adding an aqueous solution of a reactant to the basic material is added to the ground. Ground injection method characterized by injecting into the ground.
ある請求項第１項に記載の地盤注入工法。2. The ground pouring method according to claim 1, wherein the gelling time of the basic material is 1 hour or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2209330A JP2547120B2 (en) | 1990-08-09 | 1990-08-09 | Ground injection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2209330A JP2547120B2 (en) | 1990-08-09 | 1990-08-09 | Ground injection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0493409A JPH0493409A (en) | 1992-03-26 |
| JP2547120B2 true JP2547120B2 (en) | 1996-10-23 |
Family
ID=16571160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2209330A Expired - Fee Related JP2547120B2 (en) | 1990-08-09 | 1990-08-09 | Ground injection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2547120B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4502314B2 (en) * | 2004-01-23 | 2010-07-14 | 三菱レイヨン株式会社 | Water glass-based soil stabilization chemical and ground stabilization method using the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5194620A (en) * | 1975-02-17 | 1976-08-19 | DOSHITSUKAIR YOKOHO | |
| JPS5580487A (en) * | 1978-12-11 | 1980-06-17 | Sanyo Chem Ind Ltd | Soil stabilization method |
| JPS5686984A (en) * | 1979-12-17 | 1981-07-15 | Nitto Chem Ind Co Ltd | Stabilization of soil |
| JPS5993787A (en) * | 1982-11-20 | 1984-05-30 | Kyokado Eng Co Ltd | Solidification of ground |
-
1990
- 1990-08-09 JP JP2209330A patent/JP2547120B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0493409A (en) | 1992-03-26 |
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