JPS6260436B2 - - Google Patents
Info
- Publication number
- JPS6260436B2 JPS6260436B2 JP5688880A JP5688880A JPS6260436B2 JP S6260436 B2 JPS6260436 B2 JP S6260436B2 JP 5688880 A JP5688880 A JP 5688880A JP 5688880 A JP5688880 A JP 5688880A JP S6260436 B2 JPS6260436 B2 JP S6260436B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- lime
- aqueous solution
- silicic acid
- acid aqueous
- 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
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 230000002378 acidificating effect Effects 0.000 claims description 15
- 235000012239 silicon dioxide Nutrition 0.000 claims description 15
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 14
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 14
- 239000004571 lime Substances 0.000 claims description 14
- 235000019353 potassium silicate Nutrition 0.000 claims description 14
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 13
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000007596 consolidation process Methods 0.000 claims description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- -1 hydrogen ions Chemical class 0.000 claims description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 150000004679 hydroxides Chemical class 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 150000004760 silicates Chemical class 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 2
- 235000013980 iron oxide Nutrition 0.000 claims 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 claims 1
- 150000003839 salts Chemical class 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000001879 gelation Methods 0.000 description 4
- 239000003673 groundwater Substances 0.000 description 4
- 239000011440 grout Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 150000008043 acidic salts Chemical class 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011041 water permeability test Methods 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
【発明の詳細な説明】
本発明は軟弱あるいは漏水地盤に固結液を注入
して該地盤を固結する地盤注入工法に係り、特に
固結液として酸性珪酸水溶液とセメントおよび石
灰を用いた工法に係り、固結強度が大であるとと
もに、施工領域における地下水の水質保全性に優
れた工法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ground injection method of injecting a consolidation liquid into soft or leaking ground to solidify the ground, particularly a method using an acidic silicic acid aqueous solution, cement, and lime as the consolidation liquid. The present invention relates to a construction method that has high consolidation strength and excellent conservation of groundwater quality in the construction area.
本発明において、酸性珪酸水溶液とは水ガラス
と酸、あるいはさらに塩やアリカリのようなPH調
整剤を混合して水ガラス中のアルカリを除去し、
PH値が５以下の酸性を呈するように調整した水溶
液をいう。 In the present invention, the acidic silicic acid aqueous solution is obtained by mixing water glass and acid, or further adding a PH adjuster such as salt or alkali to remove the alkali in water glass.
An aqueous solution that has been adjusted to be acidic with a pH value of 5 or less.
従来、水ガラスを用いた地盤注入工法として、
水ガラスに反応剤を加えるにつれてゲル化時間が
短縮するというゲル化の現象を応用した方法が用
いられていた。従つて、このような方法では水ガ
ラスそのものが高アルカリ性であり、またPH値が
弱アルカリ性付近で瞬結になるため、固結体もア
ルカリ性（通常はPH12〜10付近）を呈し、しかも
地下水をアルカリ性にするという問題が生じる。
さらに、未反応水ガラスがゲル中に存在している
ため、長期的に未反応の水ガラスの溶脱がおこ
り、このため、固結体の恒久性が期待できず、強
度が経時的に低下するという問題も生じる。 Conventionally, as a ground injection method using water glass,
A method was used that applied the phenomenon of gelation, in which gelation time decreases as a reactant is added to water glass. Therefore, in this method, the water glass itself is highly alkaline, and since it solidifies instantaneously when the pH value is around weak alkalinity, the solidified material is also alkaline (usually around PH 12 to 10), and moreover, it is difficult to use ground water. The problem arises of making it alkaline.
Furthermore, since unreacted water glass exists in the gel, leaching of unreacted water glass occurs over a long period of time, and as a result, the permanence of the solid body cannot be expected and its strength decreases over time. The problem also arises.
また、従来、懸濁型水ガラスグラウトを用いる
工法として水ガラス水溶液にセメント懸濁液を合
流して注入する方法が用いられているが、水ガラ
ス水溶液およびセメント懸濁液のいずれも高アル
カリ性を呈し、そのゲル化は中和作用によるもの
ではなく、電気化学的に行われるため、地下水を
アルカリ性にするという問題があつた。 In addition, the conventional construction method using suspended water glass grout is to combine and inject cement suspension into water glass solution, but both water glass solution and cement suspension have high alkalinity. However, since the gelation is not due to neutralization but is carried out electrochemically, there was a problem of making the groundwater alkaline.
本発明はこのような従来のアルカリ領域の水ガ
ラスグラウトあるいは懸濁型水ガラスグラウトの
問題点を解決するとともに充分な固結強度を発揮
しうるグラウトを用いた地盤注入工法を提供する
ものである。 The present invention solves the problems of conventional alkaline water glass grout or suspended water glass grout, and provides a ground injection method using grout that can exhibit sufficient consolidation strength. .
前述の目的を達成するため、本発明によれば、
固結液として酸性珪酸水溶液と、セメントと、石
灰とを用いることを特徴とし、前記石灰の使用量
は石灰単独で前記酸性珪酸水溶液が以下の条件
〔Ａ〕および〔Ｂ〕を満たすに充分な量であるこ
とを特徴とする。 In order to achieve the aforementioned object, according to the present invention:
It is characterized in that an acidic silicic acid aqueous solution, cement, and lime are used as the solidification liquid, and the amount of lime used is sufficient for the acidic silicic acid aqueous solution to satisfy the following conditions [A] and [B]. It is characterized by being a quantity.
〔Ａ〕 PH値が約５以下を維持すること。[A] PH value must be maintained at approximately 5 or less.
〔Ｂ〕 〔Ｈ＋〕／〔ＳｉＯ２〕ｎの値が１×10-3であ
ること。[B] [H + ]/[SiO 2 ] The value of n is 1×10 −3 .
ただし、〔H+〕は水素イオンのモル濃度であ
り、〔SiO2〕は二酸化珪素のモル濃度であり、ｎ
は水ガラスのモル比である。 However, [H + ] is the molar concentration of hydrogen ions, [SiO 2 ] is the molar concentration of silicon dioxide, and n
is the molar ratio of water glass.
以下、本発明を具体的に詳述する。 Hereinafter, the present invention will be specifically explained in detail.
酸性珪酸水溶液は石灰との中和反応によりPHが
増大してゲル化が促進され、地盤中で一定時間後
に流動性が停止したのちセメントにより長期的強
度を発現する。 The pH of the acidic silicic acid aqueous solution increases through a neutralization reaction with lime, promoting gelation, and after a certain period of time in the ground, fluidity stops and cement develops long-term strength.
本発明では固結液の中にセメントおよび石灰を
用いることを必須条件とするが、さらに強度増強
剤として生石灰、アルミナ、酸化鉄、酸化マグネ
シウム、硫酸カルシウム、スラグ、フライアツシ
ユ、カルシウムシリケート粘土等、カルシウム、
マグネシウム、アルミニウム、鉄等の酸化物、水
酸化物、硫酸塩、珪酸塩を併用することができ
る。また任意の塩（無機塩、有機塩、塩基性塩、
中性塩、酸性塩等）みその他PHを変動させるのに
効果を発揮するものをPH調整剤として使用するこ
ともできるのはもちろんである。 In the present invention, it is essential to use cement and lime in the consolidation liquid, but in addition, quicklime, alumina, iron oxide, magnesium oxide, calcium sulfate, slag, flyash, calcium silicate clay, calcium ,
Oxides, hydroxides, sulfates, and silicates of magnesium, aluminum, iron, etc. can be used in combination. Also, any salt (inorganic salt, organic salt, basic salt,
Of course, neutral salts, acidic salts, etc.) and other substances that are effective in varying the pH can also be used as pH adjusters.
本発明において、酸性珪酸水溶液と、セメント
と石灰との混合物が実施例−１に示すように高強
度を得ることができる理由は不明であるが、おそ
らく石灰による中和作用により酸性珪酸水溶液の
PHを増大せしめ、かつ酸根と石灰が不溶性塩を形
成するため、セメントが効果的に固結するものと
思われる。 In the present invention, the reason why the mixture of acidic silicic acid aqueous solution, cement and lime can obtain high strength as shown in Example-1 is unknown, but it is probably due to the neutralization effect of lime that the acidic silicic acid aqueous solution
It is thought that the cement hardens effectively because the pH increases and the acid roots and lime form insoluble salts.
なお本発明における石灰量はそれ単独で前記酸
性珪酸水溶液が前述の〔Ａ〕および〔Ｂ〕の両条
件を満たすに充分な量であることが望ましい。 In the present invention, the amount of lime alone is preferably sufficient for the acidic silicic acid aqueous solution to satisfy both conditions [A] and [B].
また、本発明において、酸性珪酸水溶液、セメ
ントおよび石灰はこれらをあらかじめ混合してか
ら注入してもよく、また、あらかじめセメントお
よび石灰を地盤中に注入してから酸性珪酸水溶液
を注入し、これらを地盤中で混合してもよく、あ
るいは酸性珪酸水溶液と石灰とをあらかじめ混合
しておき、この混合液とセメントとを合流して注
入してもよく、その他いかなる方法で混合しても
よい。 Furthermore, in the present invention, the acidic silicic acid aqueous solution, cement, and lime may be mixed in advance and then injected, or the cement and lime may be injected into the ground in advance, and then the acidic silicic acid aqueous solution is injected. It may be mixed in the ground, or the acidic silicic acid aqueous solution and lime may be mixed in advance, and this mixed liquid and cement may be combined and poured, or may be mixed by any other method.
又、注入管はストレーナー管、二重管、ロツド
等任意の注入管を用いることが出来、前記両液を
合流させて注入する場合は注入管の先端部でも末
端部でも中間部でも、又注入ポンプに流入する前
のミキサーも含む管系統で合流させてもよいし、
又地盤内の土を撹拌混合しながら注入してもよい
のは勿論である。又、注入圧は常圧で注入しても
数＋Kg／cm2〜数千Kg／cm2の高圧で噴射注入を行つ
ても、又、注入管を固定したまま注入しても、上
下に移動させながら注入しても、又回転させなが
ら注入してもよい。 In addition, any injection tube such as a strainer tube, double tube, or rod can be used as the injection tube, and when the above-mentioned two liquids are combined and injected, the injection tube can be injected either at the tip, end, or middle part of the injection tube. They may be combined in a pipe system that includes a mixer before flowing into the pump, or
It goes without saying that the soil in the ground may be poured while stirring and mixing. In addition, the injection pressure will move up and down, even if it is injected at normal pressure, injection injection is performed at high pressure of several + Kg/cm 2 to several thousand Kg/cm 2 , and even if it is injected with the injection tube fixed. The injection may be carried out while rotating or may be injected while rotating.
実施例 １
軟弱な地下水面下のピート層において注入試験
を行つた。Ａ液の調整は酸性反応剤として硫酸を
用い、〔SiO2〕＝1.02とし、まずPH≒２の配合液を
つくつてから、ベントナイト配合液1.000当り
80Kgを混入した上で、消石灰によりPHを3.7およ
びＸ＝1.9×10-4（ゲル化時間：120分）とし、Ｂ
液は１m3当り高炉セメント500Kg、ベントナイト
30Kgとした。Ａ液、Ｂ液を等量づつＹ字管を用い
て合流しながら2.000注入した。注入後１週間
経てから堀削して固結状況を調査したところ、注
入管を中心にしてほぼ５m3の固結体を得た。固結
供試体の強度試験結果は
15Kg／cm2の一軸圧強度を得た。Example 1 An injection test was conducted in a peat layer below the soft groundwater table. To prepare solution A, use sulfuric acid as an acidic reactant, set [SiO 2 ]=1.02, first prepare a blended solution with PH≒2, and then add 1.000 ml of bentonite blended solution.
After mixing 80 kg, the pH was set to 3.7 and
The liquid is blast furnace cement 500Kg per 1m3 , bentonite.
The weight was 30Kg. 2,000 equal volumes of liquid A and liquid B were injected while merging using a Y-tube. One week after the injection, the soil was excavated and the solidification status was investigated, and a solidity of approximately 5 m 3 was obtained around the injection pipe. The strength test result of the consolidated specimen showed a uniaxial compressive strength of 15 Kg/cm 2 .
又、透水試験結果は注入前に ｋ＝7.8×10-2cm／secを示した。Also, the water permeability test results showed k=7.8×10 -2 cm/sec before injection.
Claims (1)
地盤を固結する地盤注入工法において、前記固結
液として酸性珪酸水溶液と、セメントと、石灰と
の混合液を用いることを特徴とし、前記石灰の使
用量は石灰単独で前記酸性珪酸水溶液が以下の条
件〔Ａ〕および〔Ｂ〕を満たすに充分な量である
地盤注入工法。 〔Ａ〕 PH値が約５以下を維持すること。 〔Ｂ〕 〔Ｈ＋〕／〔ＳｉＯ２〕ｎの値が１×10-3 以下であること。 ただし、〔H+〕は水素イオンのモル濃度であ
り、〔SiO2〕は二酸化珪素のモル濃度であり、ｎ
は水ガラスのモル比である。 ２ 特許請求の範囲第１項に記載の地盤注入工法
において、前記固結液としてさらにカルシウム、
マグネシウム、アルミニウム、および鉄の酸化
物、水酸化物、硫酸塩および珪酸塩のいずれか一
種または複数種を併用する方法。[Claims] 1. In a ground injection method in which a consolidation liquid is injected into soft or leaking ground to solidify the ground, a mixed liquid of an acidic silicic acid aqueous solution, cement, and lime is used as the consolidation liquid. The ground injection method is characterized in that the amount of lime used is sufficient for the acidic silicic acid aqueous solution to satisfy the following conditions [A] and [B]. [A] PH value must be maintained at approximately 5 or less. [B] The value of [H + ]/[SiO 2 ] n is 1×10 −3 or less. However, [H + ] is the molar concentration of hydrogen ions, [SiO 2 ] is the molar concentration of silicon dioxide, and n
is the molar ratio of water glass. 2. In the ground injection method according to claim 1, the solidification liquid further contains calcium,
A method of using one or more of magnesium, aluminum, and iron oxides, hydroxides, sulfates, and silicates in combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5688880A JPS55147589A (en) | 1980-04-28 | 1980-04-28 | Injection grouting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5688880A JPS55147589A (en) | 1980-04-28 | 1980-04-28 | Injection grouting method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP52051395A Division JPS597750B2 (en) | 1977-05-04 | 1977-05-04 | Ground injection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55147589A JPS55147589A (en) | 1980-11-17 |
| JPS6260436B2 true JPS6260436B2 (en) | 1987-12-16 |
Family
ID=13039960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5688880A Granted JPS55147589A (en) | 1980-04-28 | 1980-04-28 | Injection grouting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55147589A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57121087A (en) * | 1981-01-20 | 1982-07-28 | Kyokado Eng Co Ltd | Method of grouting chemicals |
| CN110950589B (en) * | 2019-11-29 | 2021-11-26 | 交通运输部科学研究院 | Stabilizing material for road base layer in strong sulfate saline soil area, road base layer using stabilizing material and construction method |
-
1980
- 1980-04-28 JP JP5688880A patent/JPS55147589A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55147589A (en) | 1980-11-17 |
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