JPH0456075B2 - - Google Patents
Info
- Publication number
- JPH0456075B2 JPH0456075B2 JP23735788A JP23735788A JPH0456075B2 JP H0456075 B2 JPH0456075 B2 JP H0456075B2 JP 23735788 A JP23735788 A JP 23735788A JP 23735788 A JP23735788 A JP 23735788A JP H0456075 B2 JPH0456075 B2 JP H0456075B2
- Authority
- JP
- Japan
- Prior art keywords
- carbonate
- aqueous solution
- silicic acid
- acid aqueous
- gelation time
- 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.)
- Expired
Links
- 239000007864 aqueous solution Substances 0.000 claims description 24
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 23
- 235000012239 silicon dioxide Nutrition 0.000 claims description 23
- 239000000243 solution Substances 0.000 claims description 15
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 235000019353 potassium silicate Nutrition 0.000 claims description 9
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 5
- 229940005740 hexametaphosphate Drugs 0.000 claims description 5
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- 150000001340 alkali metals Chemical class 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 239000004480 active ingredient Substances 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000001879 gelation Methods 0.000 description 31
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 22
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 18
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 18
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 13
- 229910000019 calcium carbonate Inorganic materials 0.000 description 12
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 10
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 10
- 239000001569 carbon dioxide Substances 0.000 description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 9
- 235000017557 sodium bicarbonate Nutrition 0.000 description 8
- 239000000725 suspension Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 5
- 230000002378 acidificating effect Effects 0.000 description 4
- 239000000499 gel Substances 0.000 description 4
- 239000011440 grout Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- -1 alkali metal salt Chemical class 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- HDFXRQJQZBPDLF-UHFFFAOYSA-L disodium hydrogen carbonate Chemical compound [Na+].[Na+].OC([O-])=O.OC([O-])=O HDFXRQJQZBPDLF-UHFFFAOYSA-L 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 159000000011 group IA salts Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229960003975 potassium Drugs 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 229940086066 potassium hydrogencarbonate Drugs 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
〔産業上の利用分野〕
本発明は軟弱地盤あるいは漏水地盤に注入して
地盤の固結あるいは止水に利用する地盤注入用薬
液に係り、水ガラスを酸で処理して得られる非ア
ルカリ性珪酸水溶液を用いて長時間（数分〜数10
分）におけるゲル化時間の調整を容易にし、しか
も高強度をうる地盤注入用薬液に関する。
〔従来の技術〕
地盤注入用薬液として、酸性液と水ガラスを混
合してPH１〜３の非アルカリ性珪酸水溶液を調製
し、この水溶液に水ガラス、炭酸水素ナトリウ
ム、炭酸ナトリウム等の可溶性アルカリ剤を添加
してゲル化せしめる形式のものは、長時間でのゲ
ル化時間の調整は極めて困難なため、ゲル化時間
の短い瞬結性グラウトとして使用に供されてい
る。これらの可溶性アルカリ剤に換えて、炭酸カ
ルシウム、炭酸マグネシウム等の難溶性アルカリ
剤を使用すると、数10秒から１〜２分程度のゲル
化時間は比較的制御しやすくなるが数分〜数10分
というより長いゲル化時間を維持することは以前
として困難であり、また不溶物が発生混存するた
めに地盤への浸透性に問題がある。
さらに、前述の炭酸水素塩、あるいは炭酸塩は
可溶性、難溶性の如何にかかわらず、非アルカリ
性珪酸水溶液との混合に際して多量の炭酸ガスを
発生し、ゲル化時間が短いために炭酸ガスの気泡
が固結物中に残存して固結物の強度を低下せしめ
るという欠点がある。
〔発明が解決しようとする問題点〕
本発明の目的は上記の問題点を解決せんとする
ものであつて、非アルカリ性珪酸水溶液のゲル化
にあたり、数分から数10分という長いゲル化時間
での調整を極めて容易にし、溶液状に近い状態で
かつ発生するガスを殆ど完全に発散せしめた型で
ゲル化せしめることにより、地盤への浸透性を良
好にし固結強度の強化をはかる地盤注入用薬液を
提供することにある。
〔問題点を解決するための手段〕
前述の目的を達成するため、本発明によれば、
水ガラスを酸で処理して得られる非アルカリ性珪
酸水溶液と、炭酸塩（酸性炭酸塩または中性炭酸
塩）、ヘキサメタリン酸アルカリ金属塩とを有効
成分として含有することを特徴とする。
以下 本発明を具体的に説明する。
ここで、難溶性炭酸塩として「炭酸カルシウ
ム」、可溶性炭酸塩としては「炭酸水素ナトリウ
ム」、ヘキサメタリン酸アルカリ金属塩として
「ヘキサメタリン酸ナトリウム」を用いてそれぞ
れ説明するが、これらの代わりに難溶性炭酸塩と
して炭酸マグネシウム、可溶性炭酸塩として炭酸
ナトリウム、炭酸カリウム、炭酸水素カリウム
を、またこれらの併用物を用いても、ヘキサメタ
リン酸ナトリウムに代えてヘキサメタリン酸カリ
ウムを用いても同様な傾向を示す。
本発明に用いられる非アルカリ性珪酸水溶液
は、水ガラスを酸で処理して水ガラス中のアルカ
リを除去して得られ、例えば硫酸等の酸性液に水
ガラスを強制的に攪拌混合しながら添加すること
により調製され、通常PH１〜３の強酸性を呈す
る。
この非アルカリ性珪酸水溶液と、炭酸水素ナト
リウムまたは炭酸カルシウムとヘキサメタリン酸
ナトリウムは三成分とも混合容器中で混合される
ほかに、非アルカリ性珪酸水溶液に炭酸水素ナト
リウムまたは炭酸カルシウムとヘキサメタリン酸
ナトリウムの混合液を混合してもよく、またこれ
らを合流して混合してもよい。
さらに本発明は二重管を用い、一方の管路から
非アルカリ性珪酸水溶液を送液し、他方の管路か
ら水ガラス、アルカリ性塩、セメントその他のア
ルカリ剤を送液し、注入管先端部でこれらを合流
して瞬結性グラウトとして注入し、その後本発明
に係る反応剤に切り替えてゲル化時間の長い浸透
性グラウトを注入することにより複合注入工法の
薬液として利用することもできる。
〔作用〕
本発明は前述のとおり、非アルカリ性珪酸水溶
液の反応剤として炭酸カルシウムまたは炭酸水素
ナトリウムと、ヘキサメタリン酸ナトリウムとを
併用して用いることにより、炭酸カルシウムまた
は炭酸水素ナトリウム単独の使用による欠点を大
幅に改良した。すなわち、長いゲル化時間（数分
〜数10分）の調整が可能となり、そのために反応
によつて発生する炭酸ガスはゲル化に至るまでに
全て発散するため固結体中に残存することはほと
んどなく固結強度が大となる。さらにヘキサメタ
リン酸ナトリウムは水溶液であるが炭酸カルシウ
ムは難溶性のため両者の混合液自体は懸濁状を呈
するが、この懸濁状混合液を非アルカリ性珪酸水
溶液と混合または合流すると懸濁物の大半は速や
かに溶解し、ごく僅か懸濁している状態となり、
長いゲル化時間で固結に至る。したがつて、地盤
への浸透が良好となる。
〔実施例〕
非アルカリ性珪酸水溶液として表−１に示した
配合のものを使用した。
[Industrial Application Field] The present invention relates to a chemical solution for ground injection that is injected into soft ground or leaky ground to solidify the ground or stop water, and relates to a non-alkaline silicic acid aqueous solution obtained by treating water glass with an acid. for a long time (several minutes to several tens of minutes) using
This invention relates to a chemical solution for ground injection that facilitates adjustment of gelation time (minutes) and has high strength. [Prior art] As a chemical solution for ground injection, a non-alkaline silicic acid aqueous solution with a pH of 1 to 3 is prepared by mixing an acidic solution and water glass, and a soluble alkaline agent such as water glass, sodium bicarbonate, or sodium carbonate is added to this aqueous solution. Since it is extremely difficult to adjust the gelation time over a long period of time in the type of grout that is added to cause gelation, it is used as an instant setting grout with a short gelation time. If a sparingly soluble alkali agent such as calcium carbonate or magnesium carbonate is used instead of these soluble alkali agents, the gelation time can be controlled relatively easily, ranging from several tens of seconds to 1 to 2 minutes, but the gelation time can range from several minutes to several tens of seconds. It is still difficult to maintain a gelation time longer than minutes, and there is a problem with permeability into the ground due to the generation and coexistence of insoluble matter. Furthermore, regardless of whether the aforementioned hydrogen carbonate or carbonate is soluble or poorly soluble, it generates a large amount of carbon dioxide gas when mixed with a non-alkaline silicic acid aqueous solution, and because the gelation time is short, carbon dioxide bubbles are generated. It has the disadvantage that it remains in the solidified material and reduces the strength of the solidified material. [Problems to be Solved by the Invention] The purpose of the present invention is to solve the above-mentioned problems. A chemical solution for ground injection that is extremely easy to adjust and gels in a form that is close to a solution-like state and almost completely releases the generated gas, thereby improving permeability into the ground and strengthening consolidation strength. Our goal is to provide the following. [Means for solving the problem] In order to achieve the above-mentioned object, according to the present invention,
It is characterized by containing as active ingredients a non-alkaline silicic acid aqueous solution obtained by treating water glass with an acid, a carbonate (acidic carbonate or neutral carbonate), and an alkali metal hexametaphosphate. The present invention will be specifically explained below. Here, "calcium carbonate" is used as a poorly soluble carbonate, "sodium hydrogen carbonate" is used as a soluble carbonate, and "sodium hexametaphosphate" is used as an alkali metal salt of hexametaphosphate. The same tendency is shown even when magnesium carbonate is used as the salt, sodium carbonate, potassium carbonate, potassium hydrogen carbonate is used as the soluble carbonate, or a combination thereof is used, or when potassium hexametaphosphate is used instead of sodium hexametaphosphate. The non-alkaline silicic acid aqueous solution used in the present invention is obtained by treating water glass with an acid to remove the alkali in the water glass, and for example, the water glass is added to an acidic liquid such as sulfuric acid while being forcibly stirred and mixed. It is usually strongly acidic with a pH of 1 to 3. This non-alkaline silicic acid aqueous solution, sodium hydrogen carbonate or calcium carbonate, and sodium hexametaphosphate are all mixed in a mixing container. They may be mixed, or they may be combined and mixed. Furthermore, the present invention uses a double pipe, in which a non-alkaline silicic acid aqueous solution is delivered from one pipe, water glass, alkaline salt, cement, and other alkaline agents are delivered from the other pipe, and the tip of the injection pipe is By combining these and injecting them as instant setting grout, and then switching to the reactive agent according to the present invention and injecting a permeable grout with a long gelation time, it can also be used as a chemical solution in a composite injection method. [Function] As described above, the present invention uses calcium carbonate or sodium hydrogen carbonate in combination with sodium hexametaphosphate as a reactant for a non-alkaline silicic acid aqueous solution, thereby eliminating the disadvantages caused by using calcium carbonate or sodium hydrogen carbonate alone. Significantly improved. In other words, it is possible to adjust the long gelation time (several minutes to several tens of minutes), and because of this, all the carbon dioxide gas generated by the reaction is dissipated before gelation occurs, so it does not remain in the solid. There is almost no solidification, and the consolidation strength is high. Furthermore, sodium hexametaphosphate is an aqueous solution, but since calcium carbonate is poorly soluble, a mixture of the two forms a suspension itself. However, when this suspension mixture is mixed or combined with a non-alkaline silicic acid aqueous solution, most of the suspension remains. quickly dissolves into a very slightly suspended state,
Long gelation time leads to caking. Therefore, penetration into the ground becomes better. [Example] A non-alkaline silicic acid aqueous solution having the composition shown in Table 1 was used.
【表】
表−１の非アルカリ性珪酸水溶液をＡ液とし、
これに、Ｂ液として炭酸水素ナトリウム、炭酸カ
ルシウムのそれぞれ単独の水溶液および本発明に
係わる炭酸水素ナトリウムとヘキサメタリン酸ナ
トリウムおよび炭酸カルシウムとヘキサメタリン
酸ナトリウムを併用した水溶液を用いて、Ａ液と
Ｂ液を混合した時のゲル化時間ならびにＢ液、
AB混合液の状態を表−２に示す。
表−２における実施番号１〜５の非アルカリ性
珪酸水溶液−炭酸水素ナトリウム系、実施番号６
〜11の非アルカリ性珪酸水溶液−炭酸カルシウム
系、実施番号12〜16の非アルカリ性珪酸水溶液−
炭酸水素ナトリウム−ヘキサメタリン酸ナトリウ
ム系、実施番号17〜21の非アルカリ性珪酸水溶液
−炭酸カルシウム−ヘキサメタリン酸ナトリウム
系のそれぞれのゲル化時間を第１図、第２図、第
３図および第４図に図示する。[Table] The non-alkaline silicic acid aqueous solution in Table-1 is used as liquid A,
In this, solutions A and B were prepared using individual aqueous solutions of sodium hydrogen carbonate and calcium carbonate as solutions B, as well as aqueous solutions containing sodium hydrogen carbonate and sodium hexametaphosphate and a combination of calcium carbonate and sodium hexametaphosphate according to the present invention. Gelation time and B solution when mixed,
Table 2 shows the state of the AB mixture. Non-alkaline silicic acid aqueous solutions of implementation numbers 1 to 5 in Table 2-sodium hydrogen carbonate system, implementation number 6
~11 non-alkaline silicic acid aqueous solution - calcium carbonate based, non-alkaline silicic acid aqueous solution of implementation numbers 12 to 16 -
The respective gelation times of the sodium bicarbonate-sodium hexametaphosphate system and the non-alkaline silicic acid aqueous solution-calcium carbonate-sodium hexametaphosphate system of Examples 17 to 21 are shown in Figures 1, 2, 3, and 4. Illustrated.
【表】
表−２、第１図、第２図、第３図および第４図
から次のことが明らかとなる。
１ 非アルカリ性珪酸水溶液−炭酸水素ナトリウ
ム系。
炭酸水素ナトリウムの添加量によるゲル化時間
の変動が激しく、AB合流液は完全な溶液状であ
るが長時間でのゲル化時間の調整は極めて困難で
ある。したがつて、短いゲル化時間では発生炭酸
ガスを内蔵したまま固結し強度低下の原因とな
る。
２ 非アルカリ性珪酸水溶液−炭酸カルシウム
系。
炭酸カルシウムの添加量によるゲル化時間の変
動は、１の場合に比べると緩慢となり、数10秒〜
２分程度のゲル化時間の調整は或る程度容易とな
るが、数分以上のゲル化時間を調整することは依
然として困難である。したがつて、発生する炭酸
ガスは或る程度包含した状態で固結に至る。ま
た、Ｂ液自体は勿論、AB混合液中においても沈
降物の状態にあるため、地盤への浸透性に問題が
ある。
３ 非アルカリ性珪酸水溶液−炭酸水素ナトリウ
ム−ヘキサメタリン酸ナトリウム系。
前二者の１，２の場合に比べるとゲル化時間曲
線（第３図）の傾斜は極めて緩やかで、数分〜数
10分でのゲル化時間の調整が容易となり、かつＢ
液、AB混合液共に完全な溶液状を呈し、浸透性
にも優れる。また、ゲル化時間が長いため発生炭
酸ガスはゲル化に至るまでに大半が発散し固結体
中への残存は殆どみられない。
４ 非アルカリ性珪酸水溶液−炭酸カルシウム−
ヘキサメタリン酸ナトリウム系。
前３の場合と同じように、数分〜数10分でのゲ
ル化時間の調整は容易である。Ｂ液自体は懸濁状
を呈するがＡ液との混合後は懸濁物の大半は速や
かに溶解して懸濁はごく僅かの状態となる。固結
体へ残存する炭酸ガスは勿論殆どみられない。
次にこれらグラウトの強度をみるために、これ
らグラウトを使用して標準砂によるサンドゲルを
作成して塩化ビニリデン製のフイルム状包装密封
養生した時の一軸圧縮強度を測定した。この結果
を表−３に示す。[Table] The following becomes clear from Table 2, Figures 1, 2, 3, and 4. 1 Non-alkaline silicic acid aqueous solution-sodium hydrogen carbonate system. The gelation time varies greatly depending on the amount of sodium bicarbonate added, and although the AB combined liquid is in a complete solution state, it is extremely difficult to adjust the gelation time over a long period of time. Therefore, if the gelation time is short, the gel will solidify while retaining the generated carbon dioxide gas, which will cause a decrease in strength. 2 Non-alkaline silicic acid aqueous solution-calcium carbonate system. The variation in gelation time depending on the amount of calcium carbonate added is slower than in case 1, ranging from several tens of seconds to
Although it is somewhat easier to adjust the gelation time to about 2 minutes, it is still difficult to adjust the gelation time to several minutes or more. Therefore, the generated carbon dioxide gas is contained to some extent and solidifies. Furthermore, since not only the B liquid itself but also the AB mixed liquid is in the state of sediment, there is a problem in its permeability into the ground. 3 Non-alkaline silicic acid aqueous solution-sodium hydrogen carbonate-sodium hexametaphosphate system. Compared to the former two cases 1 and 2, the slope of the gelation time curve (Figure 3) is extremely gentle, ranging from several minutes to several minutes.
It is easy to adjust the gelation time in 10 minutes, and B
Both liquid and AB mixed liquid form a complete solution and have excellent permeability. In addition, since the gelation time is long, most of the generated carbon dioxide gas is dispersed before gelation occurs, and almost no residual carbon dioxide gas is observed in the solid body. 4 Non-alkaline silicic acid aqueous solution - calcium carbonate -
Sodium hexametaphosphate. As in case 3 above, it is easy to adjust the gelation time from several minutes to several tens of minutes. Liquid B itself exhibits a suspension state, but after mixing with Liquid A, most of the suspended matter quickly dissolves, leaving only a small amount of suspension. Needless to say, almost no carbon dioxide gas remains in the solids. Next, in order to examine the strength of these grouts, sand gels were prepared from standard sand using these grouts, and the unconfined compressive strength was measured when the grouts were sealed and cured in vinylidene chloride film packaging. The results are shown in Table-3.
以上のとおり、本発明に係る地盤注入用薬液
は、非アルカリ性珪酸水溶液のゲル化に炭酸塩
（酸性炭酸塩を含む）とヘキサメタリン酸アルカ
リ金属塩の混合物からなる水溶液を使用するもの
で、炭酸塩が易溶性、難溶性の如何を問わず、非
アルカリ性珪酸水溶液との混合に際しては完全な
溶液状もしくは僅かの懸濁状となり、しかも数分
〜数10分という長い時間でゲル化に至る。このよ
うに長いゲル化時間、特に数分〜数10分での調整
を容易にし、安定化できる地盤注入用薬液は溶液
型では勿論のこと懸濁型の薬液においても例をみ
ない。しかもゲル化直前まで低粘性を維持し、地
盤への浸透に極めて優れることが期待できる。炭
酸塩を使用する関係上炭酸ガスの発生はまぬがれ
ないが、ゲル化時間が長いためにゲル化に至るま
でに殆ど完全に発散しつくし、固結体中に気泡と
して残存することはなく強度の低下をきたすこと
はない。
As described above, the chemical solution for ground injection according to the present invention uses an aqueous solution consisting of a mixture of carbonate (including acidic carbonate) and alkali metal hexametaphosphate for gelation of a non-alkaline silicic acid aqueous solution, and carbonate Regardless of whether it is easily soluble or poorly soluble, when mixed with a non-alkaline silicic acid aqueous solution, it becomes a complete solution or a slight suspension, and moreover, it gels in a long time of several minutes to several tens of minutes. There is no example of a chemical solution for ground injection that can be easily adjusted and stabilized over a long gelation time, especially several minutes to several tens of minutes, not only in a solution type but also in a suspension type. Moreover, it maintains low viscosity until just before gelation, and is expected to have excellent penetration into the ground. Due to the use of carbonates, the generation of carbon dioxide gas is unavoidable, but due to the long gelation time, it is almost completely emitted by the time gelation occurs, and no bubbles remain in the solidified material, resulting in increased strength. There will be no decline.
第１図〜第４図は、それぞれ非アルカリ性珪酸
水溶液に対する反応剤の添加量とゲル化時間の関
係を表したグラフであつて、反応剤として炭酸水
素ナトリウムを使用した場合を第１図、炭酸カル
シウムを使用した場合を第２図、本発明に係る炭
酸水素ナトリウムとヘキサメタリン酸ナトリウム
を併用した場合を第３図、炭酸カルシウムとヘキ
サメタリン酸ナトリウムを併用した場合を第４図
にそれぞれ示す。
Figures 1 to 4 are graphs showing the relationship between the amount of reactant added to a non-alkaline silicic acid aqueous solution and the gelation time, respectively. FIG. 2 shows a case where calcium is used, FIG. 3 shows a case where sodium bicarbonate and sodium hexametaphosphate according to the present invention are used together, and FIG. 4 shows a case where calcium carbonate and sodium hexametaphosphate are used together.
Claims (1)
性珪酸水溶液と、炭酸塩と、ヘキサメタリン酸ア
ルカリ金属塩とを有効成分として含有する地盤注
入用薬液。 ２ 請求項第１項に記載の地盤注入用薬液におい
て、炭酸塩が中性塩または酸性塩である地盤注入
用薬液。[Claims] 1. A chemical liquid for ground injection containing as active ingredients a non-alkaline silicic acid aqueous solution obtained by treating water glass with an acid, a carbonate, and an alkali metal hexametaphosphate. 2. The chemical solution for ground injection according to claim 1, wherein the carbonate is a neutral salt or an acid salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23735788A JPH0286685A (en) | 1988-09-21 | 1988-09-21 | Grout for ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23735788A JPH0286685A (en) | 1988-09-21 | 1988-09-21 | Grout for ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0286685A JPH0286685A (en) | 1990-03-27 |
| JPH0456075B2 true JPH0456075B2 (en) | 1992-09-07 |
Family
ID=17014197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23735788A Granted JPH0286685A (en) | 1988-09-21 | 1988-09-21 | Grout for ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0286685A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0816218B2 (en) * | 1991-12-27 | 1996-02-21 | 強化土エンジニヤリング株式会社 | Ground injection chemical material |
-
1988
- 1988-09-21 JP JP23735788A patent/JPH0286685A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0286685A (en) | 1990-03-27 |
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