JP2007177087A - Injection material and method - Google Patents
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- JP2007177087A JP2007177087A JP2005377559A JP2005377559A JP2007177087A JP 2007177087 A JP2007177087 A JP 2007177087A JP 2005377559 A JP2005377559 A JP 2005377559A JP 2005377559 A JP2005377559 A JP 2005377559A JP 2007177087 A JP2007177087 A JP 2007177087A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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Abstract
Description
本発明は、注入材及び注入工法に関する。例えば、各種土木工事における地盤改良工事や止水工事で用いられる注入材及びそれを用いた注入工法に関する。 The present invention relates to an injection material and an injection method. For example, the present invention relates to an injection material used in ground improvement work and water stop work in various civil engineering works and an injection method using the same.
トンネル土木や都市土木等で、地山や地盤の安定化を図るために、薬液型の地盤注入材が用いられてきた。この地盤注入材として、粒子を含有しない溶液型注入材が用いられている。 Chemical tunnel injection materials have been used in tunnel civil engineering and urban civil engineering in order to stabilize ground and ground. As this ground injection material, a solution type injection material containing no particles is used.
溶液型注入材は、溶液で粒子が無いため浸透性に優れている。溶液型注入材の一種たる水ガラス系溶液型注入材として、（１）珪酸ソーダ、（２）グリオキサール、（３）水溶性のアルミニウム塩、及び、（４）水溶性の有機酸、水溶性の無機酸および水溶性の酸性無機塩のうちの少なくとも１種、が添加された水性混合液を含有する水性混合液が挙げられる（特許文献１参照）。 The solution-type injection material is excellent in permeability because there is no particle in the solution. As a water glass type solution type injection material which is a kind of solution type injection material, (1) sodium silicate, (2) glyoxal, (3) water-soluble aluminum salt, and (4) water-soluble organic acid, water-soluble Examples thereof include an aqueous mixed solution containing an aqueous mixed solution to which at least one of an inorganic acid and a water-soluble acidic inorganic salt is added (see Patent Document 1).
従来のアルカリ金属珪酸塩を主剤とした溶液型注入材では、ゲルタイムが５秒以内に分類される超瞬結性という性能を満たすものが無かった。特許文献１の実施例１〜４、比較例１〜４、比較例６を見ると、ゲルタイムは最小２分３０秒、最大３分５８秒と長い。特許文献１の比較例５を見ると、数秒で不均一なゲルになるので、注入材として使用できない。 None of the conventional solution-type injection materials mainly composed of alkali metal silicate satisfy the performance of ultra-instantaneous property in which the gel time is classified within 5 seconds. When Examples 1 to 4, Comparative Examples 1 to 4, and Comparative Example 6 of Patent Document 1 are viewed, the gel time is as long as 2 min 30 sec and 3 min 58 sec at maximum. When the comparative example 5 of patent document 1 is seen, since it becomes non-uniform gel in several seconds, it cannot be used as an injection material.
本発明は、超瞬結性のアルカリ金属珪酸塩系の溶液型注入材を提供するものである。 The present invention provides an ultra-instantaneous alkali metal silicate-based solution type injection material.
本発明は、（１）アルカリ金属珪酸塩を含有するＡ材と、可溶性アルミニウム塩５０〜７０部と有機酸５０〜３０部を含有するＢ材とからなる注入材、（２）アルカリ金属珪酸塩が水ガラス、可溶性アルミニウム塩が硫酸アルミニウム、有機酸がクエン酸である（１）の注入材、（３）Ａ材の固形分濃度が５〜３５％、Ｂ材の固形分濃度が９〜３０％である（１）または（２）の注入材、（４）アルカリ金属珪酸塩を含有するＡ材と、可溶性アルミニウム塩５０〜７０部と有機酸５０〜３０部を含有するＢ材とからなる注入材を、それぞれ別々に圧送し、注入口付近で合流混合させ地盤に注入する注入工法、である。 The present invention comprises (1) an injection material comprising an A material containing an alkali metal silicate, a B material containing 50 to 70 parts of a soluble aluminum salt and 50 to 30 parts of an organic acid, and (2) an alkali metal silicate. Is water glass, soluble aluminum salt is aluminum sulfate, and organic acid is citric acid (1) injection material, (3) solid content concentration of material A is 5-35%, solid content concentration of material B is 9-30 % (1) or (2) injection material, (4) A material containing alkali metal silicate, and B material containing 50 to 70 parts of soluble aluminum salt and 50 to 30 parts of organic acid. This is an injection method in which the injection materials are separately pumped, merged and mixed in the vicinity of the injection port, and injected into the ground.
本発明の溶液型注入材は、ゲルタイムが５秒以内という、超瞬結性に優れる。 The solution-type injecting material of the present invention is excellent in ultrashort-setting properties with a gel time of within 5 seconds.
以下、本発明を詳細に説明する。
本発明における部や％は、特に規定のない限り質量基準である。
Hereinafter, the present invention will be described in detail.
Unless otherwise specified, parts and% in the present invention are based on mass.
本発明におけるＡ材は、アルカリ金属珪酸塩を含有するものであり、通常、水溶液である。アルカリ金属珪酸塩水溶液としては、例えば、珪酸ソーダや珪酸カリウム等の水溶液が挙げられ、これらの混合液も使用可能である。ＳｉＯ２／Ｒ２Ｏ（Ｒはアルカリ金属）は、モル比で２．０〜５．０であることが好ましい。これらの中では、安価な点で、珪酸ソーダ水溶液（水ガラス）が好ましい。珪酸ソーダ水溶液は、ＪＩＳ Ｋ １４０８に規定され、Ｓｉ０２／Ｎａ２Ｏモル比２．１〜２．３のものは１号珪酸ソーダ、２．４〜２．６のものは２号珪酸ソーダ、３．０〜３．３のものは３号珪酸ソーダと呼ばれ、これらの中では、３号珪酸ソーダが好ましい。 The A material in the present invention contains an alkali metal silicate and is usually an aqueous solution. Examples of the alkali metal silicate aqueous solution include aqueous solutions of sodium silicate, potassium silicate, and the like, and a mixture thereof can also be used. SiO 2 / R 2 O (R is an alkali metal) is preferably 2.0 to 5.0 molar ratio. In these, the sodium silicate aqueous solution (water glass) is preferable at an inexpensive point. The aqueous solution of sodium silicate is defined in JIS K 1408, the one having a SiO 2 / Na 2 O molar ratio of 2.1 to 2.3 is No. 1 sodium silicate, the one having 2.4 to 2.6 is No. 2 sodium silicate, Those of 3.0 to 3.3 are called No. 3 sodium silicate, and among these, No. 3 sodium silicate is preferable.
Ａ材の固形分濃度は、５〜３５％が好ましく、１５〜２５％がより好ましい。５％未満だと凝結性状が悪く固まらない場合があり、３５％を超えると水ガラス水溶液の粘度が高くなり、Ｂ材との混合性や注入作業時の圧送性が悪くなる場合がある。 The solid content concentration of the A material is preferably 5 to 35%, and more preferably 15 to 25%. If the content is less than 5%, the setting properties may be poor and do not solidify. If the content exceeds 35%, the viscosity of the aqueous water glass solution increases, and the mixing property with the B material and the pumpability during the injection work may be deteriorated.
本発明におけるＢ材は、可溶性アルミニウム塩５０〜７０部と有機酸５０〜３０部を含有するものである。 The B material in the present invention contains 50 to 70 parts of a soluble aluminum salt and 50 to 30 parts of an organic acid.
可溶性アルミニウム塩としては、例えば、硫酸アルミニウム、硫酸アルミニウム・カリウム、硫酸アルミニウム・ナトリウム、塩化アルミニウム等が挙げられる。これらの中では、アルカリ金属珪酸塩との反応性、固化物の安定性の点で、硫酸アルミニウムが好ましい。硫酸アルミニウムは、粉状、液状共に使用可能であるが、有機酸との混合性、搬送性の点で、粉状のものが好ましい。硫酸アルミニウムの中では、水に対する溶解性が高い点で、８〜１８水塩が好ましく、１４〜１８水塩がより好ましい。 Examples of the soluble aluminum salt include aluminum sulfate, aluminum sulfate / potassium, aluminum sulfate / sodium, and aluminum chloride. Among these, aluminum sulfate is preferable from the viewpoint of reactivity with alkali metal silicate and stability of solidified product. Aluminum sulfate can be used in both powder and liquid form, but is preferably in powder form from the viewpoints of miscibility with organic acids and transportability. Among aluminum sulfates, 8 to 18 hydrates are preferable, and 14 to 18 hydrates are more preferable in terms of high solubility in water.
有機酸としては、例えば、炭素原子を２個以上有し、かつ、カルボキシル基、カルボニル基及びアルデヒド基からなる群のうちの１種又は２種以上を有するものが好ましい。例えば、脂肪酸、ジカルボン酸、オキシモノカルボン酸、オキシジカルボン酸、オキシトリカルボン酸、２−ケトモノカルボン酸、２−ケトジカルボン酸、ケトース、２−ケトオキシモノカルボン酸、アルドース、ウロン酸及びこれらの誘導体等が挙げられ、これらのうちの１種又は２種以上が使用可能である。 As an organic acid, what has 2 or more carbon atoms and has 1 type or 2 types or more in the group which consists of a carboxyl group, a carbonyl group, and an aldehyde group is preferable, for example. For example, fatty acids, dicarboxylic acids, oxymonocarboxylic acids, oxydicarboxylic acids, oxytricarboxylic acids, 2-ketomonocarboxylic acids, 2-ketodicarboxylic acids, ketoses, 2-ketooxymonocarboxylic acids, aldoses, uronic acids and their Derivatives and the like can be mentioned, and one or more of these can be used.
さらに、脂肪酸には、例えば、酢酸、プロピオン酸、酪酸、吉草酸及びカプロン酸等が挙げられる。ジカルボン酸としては、例えば、シュウ酸、マロン酸、コハク酸、グルタル酸及びアジピン酸等が挙げられる。オキシモノカルボン酸としては、例えば、グリコール酸、グリセリン酸、エリスロン酸、アラボン酸、グルコン酸及びグルコヘプトン酸等が挙げられる。オキシジカルボン酸には、例えば、オキシマロン酸、酒石酸及びサッカリック酸等が挙げられる。オキシトリカルボン酸としては、例えば、クエン酸が挙げられる。２−ケトモノカルボン酸としては、例えば、ピルビン酸、２−ケト酪酸及び２−ケト吉草酸等が挙げられる。２ケトジカルボン酸としては、例えば、ケトマロン酸、２−ケトコハク酸及び２ケトグルタル酸等が挙げられる。ケトースとしては、例えば、フルクトースが挙げられる。２−ケトオキシモノカルボン酸としては、例えば、２−ケトグルコン酸が挙げられる。アルドースとしては、例えば、グリセルアルデヒド、エリスロース、アラビノース、グルコース及びグルコヘプトース等が挙げられる。ウロン酸としては、グルクロン酸が挙げられる。その他の有機酸として、例えば、リンゴ酸、蟻酸及び乳酸等が挙げられる。これらの塩等も使用可能である。これらの中では、クエン酸、リンゴ酸、グルコン酸及びそれらの塩からなる群のうちの１種又は２種以上が好ましく、クエン酸がより好ましい。クエン酸の中では、無水物がより好ましい。 Furthermore, examples of the fatty acid include acetic acid, propionic acid, butyric acid, valeric acid, and caproic acid. Examples of the dicarboxylic acid include oxalic acid, malonic acid, succinic acid, glutaric acid, and adipic acid. Examples of the oxymonocarboxylic acid include glycolic acid, glyceric acid, erythronic acid, arabonic acid, gluconic acid, and glucoheptonic acid. Examples of the oxydicarboxylic acid include oxymalonic acid, tartaric acid and saccharic acid. Examples of oxytricarboxylic acid include citric acid. Examples of 2-ketomonocarboxylic acid include pyruvic acid, 2-ketobutyric acid, 2-ketovaleric acid, and the like. Examples of the 2-ketodicarboxylic acid include ketomalonic acid, 2-ketosuccinic acid, and 2-ketoglutaric acid. Examples of ketose include fructose. Examples of 2-ketooxymonocarboxylic acid include 2-ketogluconic acid. Examples of aldoses include glyceraldehyde, erythrose, arabinose, glucose and glucoheptose. Examples of uronic acid include glucuronic acid. Examples of other organic acids include malic acid, formic acid, and lactic acid. These salts can also be used. In these, the 1 type (s) or 2 or more types in the group which consists of a citric acid, malic acid, gluconic acid, and those salts are preferable, and a citric acid is more preferable. Among citric acids, anhydrides are more preferred.
可溶性アルミニウム塩と有機酸の混合比率は、可溶性アルミニウム塩と有機酸の合計１００部中、可溶性アルミニウム塩５０〜７０部と有機酸５０〜３０部であることが好ましく、可溶性アルミニウム塩５５〜６５部と有機酸４５〜３５部であることがより好ましい。有機酸が３０部未満だと圧縮強度が小さくなり、固化体の安定性が悪くなる場合があり、５０部を超えるとゲルタイムが長くなり、圧縮強度が小さくなり、固化体の安定性が悪くなる場合がある。 The mixing ratio of the soluble aluminum salt and the organic acid is preferably 50 to 70 parts of the soluble aluminum salt and 50 to 30 parts of the organic acid in a total of 100 parts of the soluble aluminum salt and the organic acid, and 55 to 65 parts of the soluble aluminum salt. And 45 to 35 parts of organic acid. If the organic acid is less than 30 parts, the compressive strength is reduced and the stability of the solidified body may be deteriorated. If it exceeds 50 parts, the gel time is increased, the compressive strength is reduced, and the stability of the solidified body is deteriorated. There is a case.
Ｂ材の固形分濃度は、９〜３０％が好ましく、１０〜１５％がより好ましい。９％未満だと瞬結せず、ゲルタイムが長くなり、固化体の安定性も悪くなる場合があり、３０％を超えると溶液のｐＨが低くなるので金属製の注入管が腐食する場合があり、低温時では、溶解速度の低下や再結晶化が発生する場合がある。 The solid content concentration of the B material is preferably 9 to 30%, more preferably 10 to 15%. If it is less than 9%, it does not flash instantaneously, the gel time becomes longer, and the stability of the solidified body may be deteriorated. If it exceeds 30%, the pH of the solution is lowered, and the metal injection tube may be corroded. When the temperature is low, the dissolution rate may be reduced or recrystallization may occur.
本発明の注入材の混合方法及び注入方法としては、例えば、アルカリ金属珪酸塩と水を含有するＡ材、可溶性アルミニウム塩、有機酸及び水を含有するＢ材を、それぞれ別に作製した後、別々に圧送し、地盤注入前又は地盤注入後に混合する方法を用いる。Ｂ材については、可溶性アルミニウム塩、有機酸及び水を一括混合して作製してもよく、可溶性アルミニウム塩と有機酸を予め混合した混合物と水を混合してもよい。Ａ材とＢ材の混合比率は、混合性の点で、３０：７０〜７０：３０（体積比）であることが好ましく、４０：６０〜６０：４０（体積比）であることがより好ましい。この混合比率の範囲外だと、ゲル化しない場合がある。 As the mixing method and the injecting method of the injection material of the present invention, for example, the A material containing alkali metal silicate and water, the soluble aluminum salt, the B material containing organic acid and water are prepared separately, and then separately. A method of pumping and mixing before or after soil injection is used. About B material, soluble aluminum salt, an organic acid, and water may be mixed and produced, and you may mix the mixture and water which mixed the soluble aluminum salt and the organic acid beforehand. The mixing ratio of the A material and the B material is preferably 30:70 to 70:30 (volume ratio) and more preferably 40:60 to 60:40 (volume ratio) in terms of mixing properties. . If the mixing ratio is outside the range, gelation may not occur.
本発明で使用するこれらＡ材とＢ材の混合設備は均一に混合できればいかなる設備も使用可能である。例えば、注入ポンプ、注入管、Ｙ字管を使用して、土壌中に注入する。 Any equipment can be used as long as the mixing equipment for the A and B materials used in the present invention can be mixed uniformly. For example, infusion into soil using an infusion pump, infusion tube, Y-tube.
本発明のアルカリ金属珪酸塩系の溶液型注入材は、従来のアルカリ金属珪酸塩系の溶液型地盤注入材では使用できなかった、恒久性や耐久性を必要とする用途、例えば、長期間仮設土木用途にも使用できる。長期間仮設土木用途としては、例えば、地下埋設下水道管の地下水止水用途、地下室コンクリート壁とその裏面に接する土壌との一体強化の用途、恒久的な止水や地盤の安定化を目的とする地盤改良用途等が挙げられる。 The alkali metal silicate solution-type injection material of the present invention cannot be used with conventional alkali metal silicate-type solution type ground injection materials. Can also be used for civil engineering purposes. Long-term temporary civil engineering applications include, for example, underground water stoppage for underground sewer pipes, integrated reinforcement of basement concrete walls and soil in contact with the back surface, permanent water stop and ground stabilization Examples include ground improvement applications.
２０℃、湿度９０％の恒温室で実施した。アルカリ金属珪酸塩を水で希釈して固形分濃度２０％の水溶液を調整し、これをＡ材とした。一方、可溶性アルミニウム塩と有機酸を表１に記載した比率で混合し、水で希釈し、固形分濃度１０％の水溶液を調整し、Ｂ材を作製した。次いで、Ａ材、Ｂ材を混合し、各物性を測定した。Ａ材、Ｂ材の混合比率は、５０：５０（体積比）とした。結果を表１に示す。 The test was performed in a constant temperature room at 20 ° C. and a humidity of 90%. An alkali metal silicate was diluted with water to prepare an aqueous solution having a solid concentration of 20%, and this was designated as A material. On the other hand, a soluble aluminum salt and an organic acid were mixed at a ratio shown in Table 1, diluted with water to prepare an aqueous solution having a solid content concentration of 10%, and a B material was produced. Subsequently, A material and B material were mixed and each physical property was measured. The mixing ratio of the A material and the B material was 50:50 (volume ratio). The results are shown in Table 1.
＜使用材料＞
アルカリ金属珪酸塩：市販品、水溶液、水ガラス、ＪＩＳ Ｋ １４０８で規定される３号珪酸ソーダ、Ｎａ２Ｏ＝９．４％、ＳｉＯ２＝２８．４％、ＳｉＯ２／Ａｌ２Ｏ３（モル比）＝３．１２
可溶性アルミニウム塩ア：市販品、硫酸アルミニウム、１４〜１８水塩
可溶性アルミニウム塩イ：市販品、硫酸アルミニウム、無水物
有機酸Ａ：市販品、クエン酸、無水物
水：水道水
<Materials used>
Alkali metal silicate: Commercially available product, aqueous solution, water glass, No. 3 sodium silicate as defined in JIS K 1408, Na 2 O = 9.4%, SiO 2 = 28.4%, SiO 2 / Al 2 O 3 ( Molar ratio) = 3.12
Soluble aluminum salt a: Commercial product, aluminum sulfate, 14-18 water salt Soluble aluminum salt a: Commercial product, aluminum sulfate, anhydrous organic acid A: Commercial product, citric acid, anhydrous water: tap water
＜測定方法＞
ゲルタイム：Ａ材とＢ材を混合してから、混合溶液を９０度傾けてもゲルが流出、変形しなくなるまでの時間をゲルタイムとした。
離漿水率：Ａ材とＢ材を混合してから、２０℃、湿度９０％の恒温恒湿室内で２８日間養生、静置した。得られたゲルについて、生成した離漿水の容量を測定し、Ａ材とＢ材との混合液の容量に対する容積比(％)を離漿水率として評価した。
圧縮強度：Ａ材とＢ材を混合してから、２０℃、湿度９０％の恒温恒湿室内で２８日間養生、静置した。得られたゲルについて、ＪＩＳ Ａ １２１６に従って圧縮強度を測定した。
固化体観察：Ａ材とＢ材を混合してから、２０℃、湿度９０％の恒温恒湿室内で２８日間養生、静置した。得られたゲルについて、触手にて固化体観察を行った。
<Measurement method>
Gel time: The time from when the A material and the B material were mixed to when the mixed solution was tilted by 90 degrees until the gel did not flow out or deformed was defined as gel time.
Water separation rate: A material and B material were mixed and then cured and allowed to stand in a constant temperature and humidity room at 20 ° C. and 90% humidity for 28 days. About the obtained gel, the volume of produced separation water was measured, and the volume ratio (%) to the volume of the mixed liquid of A material and B material was evaluated as the separation water ratio.
Compressive strength: After mixing A material and B material, it was cured and allowed to stand in a constant temperature and humidity room at 20 ° C. and 90% humidity for 28 days. About the obtained gel, compressive strength was measured according to JIS A1216.
Observation of solidified body: After mixing A material and B material, it was cured and allowed to stand in a constant temperature and humidity room at 20 ° C. and 90% humidity for 28 days. About the obtained gel, the solidified body was observed with the tentacles.
表１に示すように、本発明の注入材は、ゲルタイムが短く、離漿水率が小さい。さらに、圧縮強度が大きいので耐久性に優れた固化体が得られる。また、硫酸アルミニウムの中では、１４〜１８水塩が、無水物より離漿水率が小さく圧縮強度が大きい。 As shown in Table 1, the injection material of the present invention has a short gel time and a low water separation rate. Furthermore, since the compressive strength is large, a solidified body having excellent durability can be obtained. Moreover, in aluminum sulfate, 14-18 hydrate has a lower water separation rate and a higher compressive strength than anhydride.
可溶性アルミニウム塩アと有機酸を６０部：４０部といった比率で混合し、可溶性アルミニウム塩ア６０部と有機酸４０部を含有し、かつ、表２に示した固形分濃度を有するＢ材を使用したこと以外は、実施例１と同様に実施し、各物性を測定した。結果を表２に示す。 Soluble aluminum salt and organic acid are mixed in a ratio of 60 parts: 40 parts, and B material containing 60 parts of soluble aluminum salt and 40 parts of organic acid and having a solid content concentration shown in Table 2 is used. Except having done, it implemented similarly to Example 1 and measured each physical property. The results are shown in Table 2.
＜測定方法＞
Ｂ材溶解性：表２に示す温度、湿度９０％の恒温室で、可溶性アルミニウム塩と有機酸を、混合し、水で希釈し、所定の固形分濃度を有する水溶液を調整し、Ｂ材を作製した。Ｂ材を作製する工程において、可溶性アルミニウム塩と有機酸の溶解性を確認した。短時間で可溶性アルミニウム塩と有機酸が完全溶解した場合を良、長時間で可溶性アルミニウム塩と有機酸が完全溶解した場合を可とした。
Ｂ材析出性：２０℃、湿度９０％の恒温室で、可溶性アルミニウム塩と有機酸を、混合し、水で希釈し、所定の固形分濃度を有する水溶液を調整し、Ｂ材を作製した。次いで、表２に示す温度、湿度９０％の恒温室で、Ｂ材を２８日間静置し、Ｂ材の性状を確認した。析出物が見られなかった場合を良とし、析出物が僅かに見られた場合を可とした。
<Measurement method>
B material solubility: In a temperature-controlled room with a temperature and humidity of 90% shown in Table 2, a soluble aluminum salt and an organic acid are mixed and diluted with water to prepare an aqueous solution having a predetermined solid content concentration. Produced. In the step of producing the B material, the solubility of the soluble aluminum salt and the organic acid was confirmed. The case where the soluble aluminum salt and the organic acid were completely dissolved in a short time was good, and the case where the soluble aluminum salt and the organic acid were completely dissolved in a long time was acceptable.
B material precipitation property: In a constant temperature room at 20 ° C. and a humidity of 90%, a soluble aluminum salt and an organic acid were mixed and diluted with water to prepare an aqueous solution having a predetermined solid content concentration to prepare a B material. Next, the B material was allowed to stand for 28 days in a temperature-controlled room at a temperature and humidity of 90% shown in Table 2, and the properties of the B material were confirmed. The case where no precipitate was found was good, and the case where a slight amount of precipitate was seen was acceptable.
表２に示すように、本発明の注入材は、Ｂ材の固形分濃度が増加すると、ゲルタイムが短くなり、離漿水率も小さい。さらに、圧縮強度が大きいので耐久性に優れる固化体が得られる。 As shown in Table 2, in the injection material of the present invention, when the solid content concentration of the B material is increased, the gel time is shortened and the water separation rate is also small. Furthermore, since the compressive strength is large, a solidified body having excellent durability can be obtained.
可溶性アルミニウム塩アと表３に示す有機酸を６０部：４０部の比率で混合した混合物を、２１０日間保存した後、この混合物を水で希釈し、固形分濃度１０％の水溶液を調整しＢ材を作製したこと以外は実施例１と同様に実施し、各物性を測定した。結果を表３に示す。 After storing a mixture of soluble aluminum salt and the organic acid shown in Table 3 in a ratio of 60 parts: 40 parts for 210 days, this mixture was diluted with water to prepare an aqueous solution having a solid content concentration of 10%. Except having produced the material, it implemented similarly to Example 1 and measured each physical property. The results are shown in Table 3.
＜使用材料＞
有機酸Ｂ：市販品、クエン酸、１水塩
<Materials used>
Organic acid B: Commercial product, citric acid, monohydrate
表３に示すように、クエン酸の中では無水物が１水塩より長期間保存後に使用しても、ゲルタイムが短く、離漿水率が小さい。さらに、圧縮強度が大きいので耐久性に優れる固化体が得られる。 As shown in Table 3, in citric acid, even when the anhydride is used after storage for a longer period than the monohydrate, the gel time is short and the water separation rate is small. Furthermore, since the compressive strength is large, a solidified body having excellent durability can be obtained.
本発明の溶液型注入材による施工例を示す。軟弱なシルト層の下をシールド工法によって下水管を敷設する工事で、実施Ｎｏ．１−４の配合に従って、Ａ材３０リットル／分、Ｂ材３０リットル／分の吐出量となるように調整しながら、別々の注入ポンプで送り、１．５ショットで、瞬時に混合できる薬液注入機に導入して、地盤内に圧力注入した。注入圧力は１〜２ｋｇ／ｃｍ２であった。
所定量注入後調査したところ、地盤とセグメントの空隙部には溶液型注入材がしっかりと充填されていた。注入箇所の湧水も止まっており、止水材として使用できた。さらに、２８日経過しても空隙部には溶液型注入材がしっかりと充填されており、恒久性や耐久性を示していた。
The construction example by the solution type injection material of this invention is shown. In the construction of sewage pipe laying under the soft silt layer by the shield method, According to the formulation of 1-4, while adjusting the discharge rate of material A 30 liters / minute and material B 30 liters / minute, it is fed with a separate injection pump and can be mixed instantaneously in 1.5 shots It was introduced into the machine and pressure was injected into the ground. Injection pressure was 1-2 kg / cm 2.
As a result of investigation after injection of a predetermined amount, the solution-type injection material was firmly filled in the space between the ground and the segment. The spring at the injection site was also stopped and could be used as a water stop material. Furthermore, even after 28 days had passed, the cavity was firmly filled with the solution-type injection material, indicating durability and durability.
本発明のアルカリ金属珪酸塩系の溶液型注入材は、ゲルタイムが５秒以内という超瞬結性を示すため、地盤注入材として土木・建築分野で幅広く使用することが可能である。他にも、離漿水率が小さく、さらに、長期の圧縮強度が高く耐久性に優れる固化体が得られるため、従来のアルカリ金属珪酸塩系の溶液型地盤注入材では使用できなかった、恒久性や耐久性を必要とする用途にも使用できる。 Since the alkali metal silicate-based injection material of the present invention exhibits ultra-instantaneous properties with a gel time of 5 seconds or less, it can be widely used as a ground injection material in the civil engineering and construction fields. In addition, since it has a low rate of water separation and a solidified body with a long-term compressive strength and excellent durability, it cannot be used with conventional alkali metal silicate-based solution-type ground injection materials. It can also be used for applications that require durability and durability.
Claims (4)
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| JP2009235174A (en) * | 2008-03-26 | 2009-10-15 | Mitsubishi Rayon Co Ltd | Hardener for soil stabilization chemical liquid, and the soil stabilization chemical liquid |
| JP2011042708A (en) * | 2009-08-19 | 2011-03-03 | Mitsubishi Rayon Co Ltd | Silicate-based chemical liquid for stabilizing soil quality and construction method for stabilizing ground using the same |
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