JP3524434B2 - Grouting material for ground injection - Google Patents
Grouting material for ground injectionInfo
- Publication number
- JP3524434B2 JP3524434B2 JP16942499A JP16942499A JP3524434B2 JP 3524434 B2 JP3524434 B2 JP 3524434B2 JP 16942499 A JP16942499 A JP 16942499A JP 16942499 A JP16942499 A JP 16942499A JP 3524434 B2 JP3524434 B2 JP 3524434B2
- Authority
- JP
- Japan
- Prior art keywords
- acid
- ground
- gelation time
- soil
- gelation
- 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 - Fee Related
Links
Classifications
-
- 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
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00112—Mixtures characterised by specific pH values
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【0001】[0001]
【発明の属する技術分野】本発明は酸と水ガラスからな
る酸性シリカゾルを用いた地盤の液状化防止に適する地
盤注入用グラウト材に係り、特に地盤の液状化防止工事
の際、長時間にわたって連続注入して大容量土地盤改良
を達成する地盤注入用グラウト材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground pouring grout material suitable for preventing liquefaction of ground by using acidic silica sol composed of acid and water glass, and particularly for a long time during the liquefaction prevention work of the ground. The present invention relates to a ground-grouting material that is injected to achieve large-scale ground improvement.
【0002】[0002]
【従来の技術】近年、埋立地等の開発にともない、地盤
の液状化を防止し得る注入材が望まれている。地盤の液
状化を防止する注入材としては、広大な領域を固化して
地下水の流動をおさえるような注入材でなければならな
い。2. Description of the Related Art In recent years, with the development of landfill sites, there has been a demand for an injection material capable of preventing liquefaction of the ground. As an injection material that prevents the liquefaction of the ground, it must be an injection material that solidifies a vast area and suppresses the flow of groundwater.
【0003】このような注入材としては、一般的には、
注入材が広い範囲にいきわたるようにゲル化時間が長
く、かつ特に土中におけるゲル化時間の短縮を低減して
高浸透性を示し、さらに、固結が確実で、しかも固結物
はできる限り中性に近ずくものであることが好ましい。As such an injection material, generally,
The injection material has a long gelation time so that it spreads over a wide range, and it shows high permeability by reducing the shortening of the gelation time especially in soil. It is preferably close to neutral.
【0004】このようなグラウト材として、従来、超微
粒子シリカや酸性シリカゾルを用いた溶液型の水ガラス
系グラウトが開発されている。As such a grout material, conventionally, a solution-type water glass grout using ultrafine particle silica or acidic silica sol has been developed.
【0005】[0005]
【発明が解決しようとする課題】しかし、超微粒子シリ
カを用いた溶液型水ガラス系グラウトはゲル化とともに
粘性が高くなって浸透性が悪くなり、しかも、ゲル化時
間の調整、特に、長いゲル化時間の調整が極めて困難で
ある。However, the solution type water glass grout using ultrafine particle silica has high viscosity and poor permeability with gelation, and moreover, the gelation time is adjusted, especially for long gels. It is extremely difficult to adjust the activation time.
【0006】さらに、酸性シリカゾルを用いた溶液型の
水ガラス系グラウトは地盤に浸透中、土砂との接触によ
りpH値が酸性から中性方向に移行し、このため、土中
でゲル化時間が著しく短縮されてしまい、地盤の液状化
防止用グラウトとしては広い注入範囲を得ることができ
ず、不適である。[0006] Further, the solution type water glass type grout using the acidic silica sol is infiltrated into the ground, the pH value shifts from acidic to neutral due to contact with earth and sand. Since it is remarkably shortened, a wide injection range cannot be obtained as a ground liquefaction prevention grout, which is unsuitable.
【0007】そこで、本発明者等は注入材のゲル化時間
が地盤中で短縮するのは単に注入液のpH値が中性に移
行することのみに基因するのではなく、地盤中に存在す
る金属イオン、特に、カルシウムイオン、鉄イオン、ア
ルミニウムイオン等が注入材中のシリカと反応して多価
金属塩を形成し、ゲル化を促進するものと判断し、これ
ら多価金属塩の形成を抑制することによってゲル化時間
の短縮を低減し得ることを見いだして本発明を完成する
に至った。Therefore, the inventors of the present invention have found that the gelling time of the injection material is shortened in the ground not only because the pH value of the injection liquid shifts to neutrality but also in the ground. It was judged that metal ions, especially calcium ions, iron ions, aluminum ions, etc., react with silica in the injecting material to form a polyvalent metal salt and accelerate gelation, and formation of these polyvalent metal salts is judged. The inventors have found that the suppression of the gelation time can be suppressed by suppressing it, and have completed the present invention.
【0008】本発明の目的はそれ自体ゲル化時間が長い
のみならず、地盤中で土砂と接触してもゲル化時間の短
縮を低減し、かつ、土粒子間に長時間連続注入する際に
起こりやすい、土粒子間のゲルの沈積による浸透低下を
少なくして地盤の液状化防止に有効であり、上述の公知
技術に存する欠点を改良した地盤注入用グラウト材を提
供することにある。The object of the present invention is not only to increase the gelation time per se, but also to reduce the shortening of the gelation time even when the soil is contacted with the soil, and to continuously inject the soil particles for a long time. It is an object of the present invention to provide a ground injection grout material which is effective in preventing the liquefaction of the ground by reducing the decrease in permeation due to the sedimentation of gel between soil particles, and which has improved the above-mentioned drawbacks of the known art.
【0009】[0009]
【課題を解決するための手段】上述の目的を達成するた
め、本発明によれば、酸と水ガラスからなる酸性シリカ
ゾルに金属イオン封鎖剤およびリン酸系化合物のいずれ
か一方または両方を有効成分としてpHが2.8以下にな
るように含有せしめ、酸性領域でpH値を調整すること
により、それ自体のゲル化時間が長いのみならず、注入
に際して地盤中で土砂と接触してもゲル化時間の短縮を
低減するようにしたことを特徴とする。In order to achieve the above object, according to the present invention, one or both of a sequestering agent and a phosphoric acid compound is added as an active ingredient to an acidic silica sol consisting of an acid and water glass. As a result, the pH is adjusted to 2.8 or less, and by adjusting the pH value in the acidic region, not only the gelation time of itself is long, but also the gelation occurs even when it contacts soil in the ground during injection. The feature is that the reduction of time is reduced.
【0010】[0010]
【発明の実施の形態】以下、本発明を具体的に詳述す
る。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
【0011】従来の酸性シリカゾルは過剰の酸(通常は
硫酸)と水ガラスとからなっている。酸性領域内でpH
が高くなる程、また、SiO2 濃度が高い程ゲル化時間
は短くなる。したがって、長いゲル化時間を得るために
はpHを低くし、SiO2 濃度も低くする必要がある。
しかし、一般にこのようにゲル化時間を長びかせるとも
ちろん強度は劣化する。Conventional acidic silica sols consist of excess acid (usually sulfuric acid) and water glass. PH in acidic range
The gelation time becomes shorter as the ratio increases and the SiO 2 concentration increases. Therefore, in order to obtain a long gelation time, it is necessary to lower the pH and the SiO 2 concentration.
However, in general, if the gelation time is extended as described above, the strength is of course deteriorated.
【0012】また、注入地盤の性質にも左右されるが、
地盤に注入すると一般にゲル化時間が著しく短縮する場
合が多い。従来の酸性シリカゾルはこのような現象を呈
するためにこれを地盤の液状化防止用グラウトとして適
用することには問題が残されている。Also, depending on the nature of the injection ground,
Injecting into the ground generally shortens the gelation time in many cases. Since the conventional acidic silica sol exhibits such a phenomenon, there remains a problem in applying it as a ground liquefaction preventing grout.
【0013】本発明は酸性シリカゾルに金属イオン封鎖
剤およびリン酸系化合物のいずれか一方または両方を有
効成分としてpH値が2.8以下の酸性領域になるように
含有せしめることにより上記課題を解決することができ
た。上述の金属イオン封鎖剤やリン酸系化合物は単独
で、あるいは複数種を組み合わせて使用し得ることも勿
論である。さらにpH調整のため他の反応剤を加えるこ
ともできる。pH値が2.8〜3.0以上では、ホモゲルお
よび土中でのゲル化時間が急速に早まって不安定とな
る。The present invention solves the above-mentioned problems by including one or both of a sequestering agent and a phosphoric acid compound in an acidic silica sol as an active ingredient so that the pH value is in an acidic region of 2.8 or less. We were able to. Of course, the above-mentioned sequestering agents and phosphoric acid compounds may be used alone or in combination of two or more kinds. Further, another reagent may be added for adjusting the pH. When the pH value is 2.8 to 3.0 or more, the gelation time in homogel and soil is rapidly accelerated and becomes unstable.
【0014】上述の金属イオン封鎖剤としては、エチレ
ンジアミン四酢酸、ニトリロトリ酢酸、ジエチレントリ
アミン五酢酸、ヒドロキシエチルエチレンジアミン三酢
酸、プロピレンジアミン四酢酸、ビス(2−ヒドロキシ
フエニル酢酸)エチレンジアミン、コハク酸、これらの
塩類、脂肪族オキシカルボン酸およびその塩類、縮合リ
ン酸塩等が挙げられる。Examples of the above-mentioned sequestering agents include ethylenediaminetetraacetic acid, nitrilotriacetic acid, diethylenetriaminepentaacetic acid, hydroxyethylethylenediaminetriacetic acid, propylenediaminetetraacetic acid, bis (2-hydroxyphenylacetic acid) ethylenediamine and succinic acid. Examples thereof include salts, aliphatic oxycarboxylic acids and salts thereof, condensed phosphates and the like.
【0015】脂肪族オキシカルボン酸類としては、酒石
酸、クエン酸、グルコン酸、ジヒドロキシエチルグリシ
ン酸等、およびその塩、、縮合リン酸塩としてはピロリ
ン酸、トリリン酸、トリメタリン酸、テトラメタリン酸
等のポリリン酸の塩であるが、具体的にはピロリン酸ナ
トリウム、酸性ピロリン酸ナトリウム、トリポリリン酸
ナトリウム、テトラポリリン酸ナトリウム、ヘキサメタ
リン酸ナトリウム、酸性ヘキサメタリン酸ナトリウムま
たはこれらのカリウム塩等である。Aliphatic oxycarboxylic acids include tartaric acid, citric acid, gluconic acid, dihydroxyethylglycinic acid and the like, and salts thereof, and condensed phosphates such as pyrophosphoric acid, triphosphoric acid, trimetaphosphoric acid and tetrametaphosphoric acid. Specific examples of the salt of polyphosphoric acid include sodium pyrophosphate, sodium acid pyrophosphate, sodium tripolyphosphate, sodium tetrapolyphosphate, sodium hexametaphosphate, sodium acid hexametaphosphate and potassium salts thereof.
【0016】また、リン酸系化合物としては上述の縮合
リン酸塩以外のものであって、例えば通常のリン酸、正
リン酸塩、酸性リン酸塩等である。The phosphoric acid-based compound is other than the above-mentioned condensed phosphoric acid salt, for example, ordinary phosphoric acid, orthophosphoric acid salt, acidic phosphoric acid salt and the like.
【0017】このようにしてなる本発明にかかるグラウ
ト材はそれ自体ゲル化時間が長く、ゲル化直前まで比較
的低粘性を呈し、かつ土中におけるゲル化時間の短縮が
少ない。このことは金属イオン封鎖剤が土中の微量金属
の封鎖剤として作用し、また、リン酸系化合物が土中で
縮合して金属封鎖作用を呈し、金属塩の形成を著しく抑
制することと、金属イオン封鎖剤の緩衝作用によって土
中でのpHの上昇が緩慢になることの相乗効果によるも
のと推定される。このような効果は特にクエン酸または
その塩を含有する場合において著しい。The grout material according to the present invention thus formed has a long gelation time per se, exhibits a relatively low viscosity until immediately before gelation, and has a short gelation time in soil. This means that the sequestering agent acts as a sequestering agent for a trace amount of metal in the soil, and the phosphoric acid-based compound condenses in the soil to exhibit a sequestering action, and significantly suppresses the formation of a metal salt, It is presumed that this is due to the synergistic effect that the increase in pH in the soil becomes slow due to the buffering action of the sequestering agent. Such an effect is remarkable especially in the case of containing citric acid or a salt thereof.
【0018】[0018]
【発明の実施例】以下、本発明を実施例によって詳述す
るが、本発明はこれらの実施例によって限定されるもの
ではない。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to these Examples.
【0019】1.使用材料
(1)水ガラス
各種モル比の水ガラス、特にJIS3号水ガラスおよび
さらに高モル比の水ガラスが好ましく、ここでは最も般
用的な次の組成からなるJIS3号水ガラスを使用。1. Materials to be used (1) Water glass Water glass of various molar ratios, particularly JIS No. 3 water glass and water glass of even higher molar ratio are preferable. Here, the most commonly used JIS No. 3 water glass having the following composition is used.
【0020】比重(20℃):1.39、 SiO2 :2
9.2%、 Na2 O:9.5%、モル比:3.17Specific gravity (20 ° C.): 1.39, SiO 2 : 2
9.2%, Na 2 O: 9.5%, molar ratio: 3.17
【0021】(2)硫酸 75%工業用硫酸(2) Sulfuric acid 75% industrial sulfuric acid
【0022】(3)金属イオン封鎖剤 (a)エチレンジアミン四酢酸 C10H16N2 O8 (b)クエン酸 工業薬品(3) Sequestering agent (a) Ethylenediaminetetraacetic acid C 10 H 16 N 2 O 8 (b) Citric acid Industrial chemicals
【化1】
(c)クエン酸ナトリウム C6 H5 O7 Na3 ・2
H2 O
(d)縮合リン酸塩
ヘキサメタリン酸ナトリウム (NaPO3)6
酸性ピロリン酸ナトリウム Na2 H2 P2 O7 [Chemical 1] (C) sodium citrate C 6 H 5 O 7 Na 3 · 2
H 2 O (d) condensed phosphate sodium hexametaphosphate (NaPO 3 ) 6 sodium acid pyrophosphate Na 2 H 2 P 2 O 7
【0023】(4)リン酸系化合物
(a)リン酸 75%工業用リン酸
(b)リン酸二水素ナトリウム NaH2 PO4 ・2
H2 O[0023] (4) a phosphate-based compound (a) phosphoric acid 75% technical phosphoric acid (b) sodium dihydrogen phosphate NaH 2 PO 4 · 2
H 2 O
【0024】(5)炭酸水素ナトリウム 試薬一級 NaHCO3 (5) Sodium hydrogen carbonate reagent first grade NaHCO 3
【0025】(6)砂
細砂として豊浦砂、シルト質砂として千葉県産の海砂を
使用。(6) Toyoura sand is used as the fine sand, and sea sand from Chiba Prefecture is used as the silty sand.
【0026】2.測定法
(1)サンドゲル一軸圧縮強度
豊浦砂によるサンドゲルを28日間ポリ塩化ビニリデン
密閉養生(20℃)して土質工学会基準「土の一軸圧縮
試験方法」により測定。2. Measurement method (1) Unconfined compressive strength of sand gel The sand gel of Toyoura sand was subjected to polyvinylidene chloride closed curing (20 ° C.) for 28 days and measured according to the Japan Society of Geotechnical Standards “Unaxial compressive test method of soil”.
【0027】(2)ゲル化時間 (a)ホモゲルのゲル化時間 20℃においてカップ倒立法により測定。(2) Gelation time (A) Gelation time of homogel Measured by the cup inverted method at 20 ° C.
【0028】(b)土中ゲル化時間
20℃においてグラウト液を砂と混合・静止し、上澄を
捨て、砂に竹串を刺して引き抜き、跡が残ったときを土
中ゲル化時間として測定。(B) Soil gelation time At 20 ° C., the grout solution is mixed with sand and allowed to stand still, the supernatant is discarded, and a bamboo skewer is stabbed into the sand to pull it out. Measurement.
【0029】(3)pH ガラス電極pH計にて測定。(3) pH Measured with a glass electrode pH meter.
【0030】(4)粘性 B型粘度計で粘度が100cps を越えるまで測定。(4) Viscosity Measure with a B-type viscometer until the viscosity exceeds 100 cps.
【0031】(5)土中ゲル化時間短縮率
ホモゲルのゲル化時間に対する土中におけるゲル化時間
の短縮の割合を次式で算出して表示した。(5) Soil gelation time reduction rate The ratio of the gelation time reduction in soil to the gelation time of homogel was calculated by the following formula and displayed.
【0032】[0032]
【数1】 [Equation 1]
【0033】3.実施例
水ガラスと硫酸からなる酸性シリカゾルを製造するに際
して、金属イオン封鎖剤および/またはリン酸系化合物
を併用した。実施した配合例と配合液のpH、ゲル化時
間〔ホモゲル、土中(豊浦砂、千葉県産海砂)〕、土中
ゲル化時間短縮率、サンドゲル一軸圧縮強度を表1に示
した。3. Example In producing an acidic silica sol composed of water glass and sulfuric acid, a sequestering agent and / or a phosphoric acid compound was used in combination. Table 1 shows the formulation examples and the pH of the formulation, the gelation time [homogel, soil (Toyoura sand, sea sand produced in Chiba Prefecture)], the gelation time reduction rate in soil, and the uniaxial compressive strength of sand gel.
【0034】また、配合液の時間を追って20℃におけ
る粘性の変化を測定し、経過時間(ゲル化時間に対する
割合)に対する粘性の変化を図1に示した。Further, the change in viscosity at 20 ° C. was measured over time of the mixed solution, and the change in viscosity with respect to the elapsed time (ratio to gelation time) is shown in FIG.
【0035】[0035]
【表1】 [Table 1]
【0036】表1において、比較例 No.1、2、4、
5、7は水ガラスと硫酸とからなる従来の酸性シリカゾ
ルである。水ガラスの含有量が濃厚な程、またpHが高
い程、当然のことながらゲル化時間は早くなる傾向にあ
る。In Table 1, Comparative Examples No. 1, 2, 4,
Reference numerals 5 and 7 are conventional acidic silica sols composed of water glass and sulfuric acid. As the content of water glass is higher and the pH is higher, the gelation time tends to be shorter as a matter of course.
【0037】実施例はそれぞれの比較例に金属イオン封
鎖剤および/またはリン酸系化合物を添加したもので、
ホモゲルのゲル化時間は比較例のゲル化時間と大差な
く、略同じ位の値を示す。In each of the comparative examples, a sequestering agent and / or a phosphoric acid compound is added to each comparative example.
The gelation time of the homogel is almost the same as the gelation time of the comparative example, and shows almost the same value.
【0038】しかし、土中ゲル化時間をみると、比較例
では極端に短くなり、土中ゲル化時間短縮率は豊浦砂の
場合97〜98%、千葉県産海砂の場合99%以上と非
常に大きい。However, the soil gelation time was extremely short in the comparative example, and the soil gelation time reduction rate was 97 to 98% for Toyoura sand and 99% or more for sea sand produced in Chiba prefecture. Very big.
【0039】しかるに、それぞれの比較例に対応する実
施例では、豊浦砂の場合61〜93%、千葉県産海砂の
場合84〜95%と小さくなっている。特に、金属イオ
ン封鎖剤としてクエン酸を含有している系(実施例 No.
2、6、8、10) では豊浦砂の場合61〜87%、千
葉県産海砂の場合84〜93%と小さくなっている。In the examples corresponding to the respective comparative examples, however, it is as small as 61 to 93% in the case of Toyoura sand and 84 to 95% in the case of sea sand produced in Chiba prefecture. In particular, a system containing citric acid as a sequestering agent (Example No.
In No. 2, 6, 8, 10), Toura sand is 61 to 87%, and Chiba prefecture sea sand is 84 to 93%.
【0040】すなわち、従来の酸性シリカゾルは、それ
自体ではSiO2 濃度、pHにも左右されるが一般にホ
モゲルのゲル化時間は数時間〜数日であるが、これが一
旦土中に注入されると土中ゲル化時間は1分弱〜数10
分に短縮してしまう。That is, although the conventional acidic silica sol itself depends on the SiO 2 concentration and pH, the gelling time of the homogel is generally several hours to several days, but once this is injected into the soil. Soil gelation time is less than 1 minute to several tens.
It will be shortened to minutes.
【0041】比較例No.3、6、8は金属イオン封鎖剤、
リン酸系化合物を含んでいるがpHが高く2.8以上の場
合で、土中ゲル化時間の短縮は本発明のように比較的少
ないが、ホモゲル自体のゲル化時間が短くなっているの
で必然的に土中でのゲル化が早く、千葉県産海砂中では
10分以内となり、液状化防止用としては些か不安定で
好ましくない。Comparative Examples Nos. 3, 6 and 8 are sequestering agents for metal ions,
In the case of containing a phosphoric acid compound but having a high pH of 2.8 or higher, the shortening of the gelling time in soil is relatively small as in the present invention, but the gelling time of the homogel itself is shortened. Inevitably, gelation in soil is fast, and it takes less than 10 minutes in sea sand produced in Chiba Prefecture, which is not preferable because it is a little unstable for preventing liquefaction.
【0042】これに対して、本発明の系ではホモゲルの
ゲル化時間は従来の酸性シリカゾルと略同一であるが、
土中ゲル化時間は数10分〜300分位となる。On the other hand, in the system of the present invention, the gelation time of the homogel is almost the same as that of the conventional acidic silica sol,
The soil gelation time is about several tens of minutes to 300 minutes.
【0043】また、本発明の系では、上述のように土中
ゲル化時間は長いにもかかわらず、強度的には従来の酸
性シリカゾルとほとんど変わらないか、むしろ若干高い
ような傾向にある。Further, in the system of the present invention, although the gelling time in soil is long as described above, the strength thereof is almost the same as that of the conventional acidic silica sol, or rather slightly higher.
【0044】図1において、本発明にかかる系では、ほ
ぼ曲線(a)の実線をほどこした範囲に集中している。
これに対して、比較例の酸性シリカゾル(ただし、比較
例No.3、6、8は除く)では、ほぼ曲線(b)の点線を
ほどこした範囲に集中しており、本発明にかかる系は従
来の酸性シリカゾルに比べて低粘性でゲル化に至るまで
経過することがわかった。In FIG. 1, in the system according to the present invention, the concentration is almost in the range indicated by the solid line of the curve (a).
On the other hand, in the acidic silica sol of Comparative Example (excluding Comparative Examples Nos. 3, 6, and 8), the concentration is almost in the range shown by the dotted line of the curve (b), and the system according to the present invention is It was found that the viscosity was lower than that of the conventional acidic silica sol and gelation occurred.
【0045】上記実施例で、金属イオン封鎖剤として、
エチレンジアミン四酢酸、クエン酸、クエン酸ナトリウ
ム、ヘキサメタリン酸ナトリウム、酸性ピロリン酸ナト
リウムを一例としてとりあげ、また、縮合リン酸塩以外
のリン酸系化合物として、リン酸、リン酸二水素ナトリ
ウムを一例としてとりあげたが、もちろん既に、本文中
に記載したこれ以外の金属イオン封鎖剤やリン酸系化合
物においても程度の差はあれ、同傾向の効果が得られ
る。In the above embodiment, the sequestering agent is
Take ethylenediaminetetraacetic acid, citric acid, sodium citrate, sodium hexametaphosphate, sodium acid pyrophosphate as an example, and phosphoric acid compounds other than condensed phosphates, such as phosphoric acid and sodium dihydrogenphosphate. However, of course, other sequestering agents and phosphoric acid compounds other than those described in the present text can obtain the same effects to a different degree.
【0046】以上から、本発明にかかる地盤注入用グラ
ウト材は、地盤中でゲル化時間の短縮を大幅に低減でき
るので、土中ゲル化時間を長く保持でき、しかもゲル化
直前まで比較的低粘性が維持されるので、浸透性に優
れ、また、従来の酸性シリカゾルに比適した固結強度を
示し、特に、地盤の液状化防止工事において、長時間連
続注入により大容量土地盤改良に期待がもてる。From the above, the ground pouring grout material according to the present invention can greatly reduce the shortening of the gelation time in the ground, so that the gelation time in soil can be maintained for a long time and is relatively low until just before gelation. Viscosity is maintained, so it has excellent permeability and shows a consolidation strength that is more suitable than conventional acidic silica sols, and is particularly expected to improve large-capacity land by long-term continuous injection in ground liquefaction prevention work. I can play.
【0047】[0047]
【発明の効果】本発明にかかる地盤注入用グラウト材は
次のような効果を奏し得る。The ground pouring grout material according to the present invention can exert the following effects.
【0048】1.地盤中でゲル化時間の短縮を低減でき
るので、土中ゲル化時間が長く保持できる。1. Since the shortening of the gelation time in the ground can be reduced, the gelation time in the soil can be maintained for a long time.
【0049】2.ゲル化直前まで比較的低粘性が維持す
る。2. Relatively low viscosity is maintained until just before gelation.
【0050】3.上記のようにゲル化が長びくにもかか
わらず、従来の酸性シリカゾルに略比適する固結強度を
示す。3. Despite the long gelation as described above, it exhibits a consolidation strength that is approximately suitable for conventional acidic silica sols.
【0051】したがって、本発明地盤注入用グラウト材
は地盤の液状化防止用グラウトとして優れている。Therefore, the ground-grouting material of the present invention is excellent as a ground liquefaction-preventing grout.
【図1】本発明のグラウト材と、比較例の酸性シリカゾ
ルの配合後の経過時間に対する粘性の変化を示したグラ
フである。FIG. 1 is a graph showing changes in viscosity with time after compounding a grout material of the present invention and an acidic silica sol of a comparative example.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭60−53588(JP,A) 特開 昭55−34201(JP,A) (58)調査した分野(Int.Cl.7,DB名) C09K 17/46,17/48 E02D 3/12 C09K 103/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-53588 (JP, A) JP-A-55-34201 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) C09K 17 / 46,17 / 48 E02D 3/12 C09K 103/00
Claims (2)
金属イオン封鎖剤およびリン酸系化合物のいずれか一方
または両方をpH値が2.8以下になるように含有せし
め、地盤中で土砂と接触してもゲル化時間の短縮を低減
して土中ゲル化時間を長くし、かつ長時間連続注入によ
る大容量土地盤改良を可能とし、地盤の液状化防止に用
いることを特徴とする地盤注入用グラウト材。1. An acidic silica sol composed of an acid and water glass is made to contain one or both of a sequestering agent and a phosphoric acid-based compound so that the pH value is 2.8 or less, and contacted with earth and sand in the ground. Even if the gelation time is shortened
To increase the gelation time in the soil and
It is possible to improve the large-capacity land and prevent liquefaction of the ground.
It is a grout material for ground injection.
および/またはクエン酸の塩である請求項1の地盤注入
用グラウト材。2. The ground injection grout material according to claim 1, wherein the sequestering agent according to claim 1 is citric acid and / or a salt of citric acid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16942499A JP3524434B2 (en) | 1999-06-16 | 1999-06-16 | Grouting material for ground injection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16942499A JP3524434B2 (en) | 1999-06-16 | 1999-06-16 | Grouting material for ground injection |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2001003049A JP2001003049A (en) | 2001-01-09 |
JP3524434B2 true JP3524434B2 (en) | 2004-05-10 |
Family
ID=15886345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16942499A Expired - Fee Related JP3524434B2 (en) | 1999-06-16 | 1999-06-16 | Grouting material for ground injection |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3524434B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4912486B2 (en) * | 2010-06-30 | 2012-04-11 | 日本化学工業株式会社 | Ground injection grout material and ground injection method |
KR101497220B1 (en) | 2013-07-16 | 2015-02-27 | 지스엔지니어링 주식회사 | Composition for silica sols grouting comprising admixture for gelation time control |
-
1999
- 1999-06-16 JP JP16942499A patent/JP3524434B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2001003049A (en) | 2001-01-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0273445B1 (en) | Chemical grout for ground injection and method for accretion | |
JP3524434B2 (en) | Grouting material for ground injection | |
JP3714586B2 (en) | Solidification material for ground injection | |
JPS6148559B2 (en) | ||
JPS5876480A (en) | Gelation modifying composition for alkali metal silicate and gelation modification | |
JP3131900B2 (en) | Grout material for ground injection | |
JP3072346B2 (en) | Ground injection material | |
JP5814010B2 (en) | Immediate injection material for ground improvement and manufacturing method thereof | |
JP6712828B1 (en) | Ground injection material and ground injection method | |
JP4701370B2 (en) | Ground injection method | |
JP2004027023A (en) | Water glass grouting material and manufacturing method, grouting method and apparatus | |
KR100397249B1 (en) | Ground material for pouring ground and ground pouring working method using the same | |
JP3714590B2 (en) | Chemical solution for ground injection | |
JP3150380B2 (en) | Ground injection agent and its injection method | |
JP3776268B2 (en) | Chemical solution for ground injection | |
JP4164172B2 (en) | Chemical solution for ground injection | |
JP4679787B2 (en) | Ground injection material | |
JP2984923B2 (en) | Grout material for ground injection | |
JP3216878B2 (en) | Grout material for ground injection | |
JPS62290790A (en) | Grout for injection into ground | |
JPS62199684A (en) | Soil stabilization works | |
JPS58174489A (en) | Stabilization method of soil | |
JP3714589B2 (en) | Chemical solution for ground injection | |
JPS636594B2 (en) | ||
JPH0262158B2 (en) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20040212 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 3524434 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080220 Year of fee payment: 4 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090220 Year of fee payment: 5 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100220 Year of fee payment: 6 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100220 Year of fee payment: 6 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100220 Year of fee payment: 6 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110220 Year of fee payment: 7 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110220 Year of fee payment: 7 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120220 Year of fee payment: 8 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120220 Year of fee payment: 8 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120220 Year of fee payment: 8 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130220 Year of fee payment: 9 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130220 Year of fee payment: 9 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130220 Year of fee payment: 9 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140220 Year of fee payment: 10 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
LAPS | Cancellation because of no payment of annual fees |