JP2010121083A - Production method of consolidating material for grouting - Google Patents

Production method of consolidating material for grouting Download PDF

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JP2010121083A
JP2010121083A JP2008298069A JP2008298069A JP2010121083A JP 2010121083 A JP2010121083 A JP 2010121083A JP 2008298069 A JP2008298069 A JP 2008298069A JP 2008298069 A JP2008298069 A JP 2008298069A JP 2010121083 A JP2010121083 A JP 2010121083A
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sodium silicate
acid
colloidal silica
supply
silica
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JP5640198B2 (en
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Hiroshi Isobe
弘 磯部
Shigeo Sasahara
茂生 笹原
Yoshihiro Mitani
佳裕 三谷
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Fuji Chemical Co Ltd
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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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0079—Rheology influencing agents
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/10—Accelerators; Activators
    • C04B2103/14—Hardening accelerators
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production method for preparing a uniform consolidating material for grouting, suppressed in generation of white turbidity and partial gelation. <P>SOLUTION: There is provided a production method of a consolidating material for grouting which material contains colloidal silica, sodium silicate and an acid, wherein the method is characterized by (1) starting supply of the colloidal silica or the acid before supplying the sodium silicate into a vessel for preparing the consolidation material for grouting, and (2) having a term when all of the colloidal silica, the sodium silicate and the acid are supplied simultaneously. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、地盤の液状化防止注入工事に有用なコロイダルシリカ、珪酸ソーダ及び酸を含有する地盤注入用固結材の製造方法に関する。   TECHNICAL FIELD The present invention relates to a method for producing a ground-injection consolidated material containing colloidal silica, sodium silicate and an acid, which are useful for ground liquefaction prevention infusion work.

従来、コロイダルシリカ及び珪酸ソーダを含有する地盤注入用固結材は知られている。例えば、特許文献１の請求項１には、「コロイダルシリカと、水ガラス（珪酸ソーダ）とを含み、地盤への注入前にはそれ自体でゲル化しないアルカリ性シリカ溶液からなる地盤注入用固結材。」が記載されている。   Conventionally, a ground injection consolidation material containing colloidal silica and sodium silicate has been known. For example, in claim 1 of Patent Document 1, “consolidation for ground injection made of an alkaline silica solution containing colloidal silica and water glass (sodium silicate) and which does not gel by itself before being injected into the ground. Material ".

上記特許文献１には、コロイダルシリカと水ガラスの混合物（アルカリ性シリカ溶液）に反応剤として硫酸、リン酸、塩化アルミニウム等を添加できることが記載されている。この点について、特許文献１の［0029］段落には、「例えば、アルカリ性シリカ溶液に酸性反応剤を添加して該溶液を酸性〜中性領域に調整して所定のゲル化時間を有するグラウトとすることができる。」と記載されている。   Patent Document 1 describes that sulfuric acid, phosphoric acid, aluminum chloride and the like can be added as a reactant to a mixture of colloidal silica and water glass (alkaline silica solution). In this regard, paragraph [0029] of Patent Document 1 states that, for example, a grout having a predetermined gelation time by adding an acidic reagent to an alkaline silica solution to adjust the solution to an acidic to neutral region. Can be done. "

しかしながら、特許文献１のように、アルカリ性シリカ溶液を調製後に酸等の反応剤を添加する場合には、得られる地盤注入用固結材が白濁し易く、また部分ゲルと称呼される副生物が生じ易いという問題がある。得られる地盤注入用固結材が白濁したり部分ゲルが生じたりする場合には、地盤注入用固結材の均質性が十分ではなく、液状化防止注入工事に適用した際に注入全領域において十分な効果が得られない場合がある。   However, as in Patent Document 1, when a reactive agent such as an acid is added after preparing an alkaline silica solution, the obtained ground-injection consolidated material is likely to become cloudy, and a by-product called a partial gel is present. There is a problem that it is likely to occur. If the resulting solid material for ground injection becomes cloudy or has a partial gel, the solid material for ground injection is not sufficiently homogeneous, and when applied to liquefaction prevention injection work, A sufficient effect may not be obtained.

従って、白濁や部分ゲルの発生が抑制された均質な地盤注入用固結材を調製するための製造方法の開発が望まれている。
特開２００１−３０４７号公報 Therefore, it is desired to develop a production method for preparing a homogenous consolidation material for ground injection in which generation of white turbidity and partial gel is suppressed.
JP 2001-3047 A

本発明は、白濁や部分ゲルの発生が抑制された均質な地盤注入用固結材の製造方法を提供することを目的とする。   An object of this invention is to provide the manufacturing method of the solidified material for homogeneous ground injection by which generation | occurrence | production of cloudiness and a partial gel was suppressed.

本発明者は、上記目的を達成すべく鋭意研究を重ねた結果、各原料を特定の順序で混合する場合には、上記目的を達成できることを見出し、本発明を完成するに至った。   As a result of intensive studies to achieve the above object, the present inventor has found that the above object can be achieved when the raw materials are mixed in a specific order, and the present invention has been completed.

即ち、本発明は、下記の地盤注入用固結材の製造方法に関する。
１．コロイダルシリカ、珪酸ソーダ及び酸を含有する地盤注入用固結材の製造方法であって、
（１）前記地盤注入用固結材を調製する容器に前記珪酸ソーダに先立って前記コロイダルシリカ又は前記酸を供給開始し、
（２）前記コロイダルシリカ、前記珪酸ソーダ及び前記酸の全てが同時に供給されている期間を有することを特徴とする製造方法。
２．前記コロイダルシリカを供給開始した後、前記珪酸ソーダ、前記酸の順に供給開始する、上記項１に記載の製造方法。
３．前記コロイダルシリカを供給開始した後、前記酸、前記珪酸ソーダの順に供給開始する、上記項１に記載の製造方法。
４．前記酸を供給開始した後、前記珪酸ソーダ、前記コロイダルシリカの順に供給開始する、上記項１に記載の製造方法。
５．前記酸を供給開始した後、前記コロイダルシリカ、前記珪酸ソーダの順に供給開始する、上記項１に記載の製造方法。
６．前記コロイダルシリカは、ＳｉＯ２の平均粒子径が３〜３０ｎｍであり、且つ、ＳｉＯ２濃度が３〜２５質量％である、上記項１〜５のいずれかに記載の製造方法。
７．前記珪酸ソーダは、ＳｉＯ２／Ｎａ２Ｏで表されるモル比が３〜５であり、且つ、ＳｉＯ２濃度が３〜１５質量％である、上記項１〜６のいずれかに記載の製造方法。
８．前記コロイダルシリカと前記珪酸ソーダの割合は、ＳｉＯ２の質量比に換算して１０：９０〜９０：１０である、上記項１〜７のいずれかに記載の製造方法。
９．前記酸は、硫酸及び／又はリン酸である、上記項１〜８のいずれかに記載の製造方法。
１０．前記地盤注入用固結材は、ｐＨが１〜８の範囲でありＳｉＯ２濃度が３〜１５質量％の範囲である、上記項１〜９のいずれかに記載の製造方法。 That is, the present invention relates to the following method for producing a grounding consolidated material.
1. A method for producing a ground-injection consolidated material containing colloidal silica, sodium silicate and acid,
(1) Start supplying the colloidal silica or the acid prior to the sodium silicate to the container for preparing the consolidation material for ground injection,
(2) The manufacturing method characterized by having the period when all the said colloidal silica, the said sodium silicate, and the said acid are supplied simultaneously.
2. The manufacturing method of said claim | item 1 which starts supply in order of the said sodium silicate and the said acid after starting supply of the said colloidal silica.
3. The manufacturing method of said claim | item 1 which starts supply in order of the said acid and the said sodium silicate after starting supply of the said colloidal silica.
4). The manufacturing method of said claim | item 1 which starts supply in order of the said sodium silicate and the said colloidal silica after starting the supply of the said acid.
5). The manufacturing method of said claim | item 1 which starts supply in order of the said colloidal silica and the said sodium silicate after starting the supply of the said acid.
6). The colloidal silica has an average particle diameter of SiO 2 is 3 to 30 nm, and, SiO 2 concentration is 3 to 25 mass%, the production method according to any one of items 1-5.
7). The sodium silicate is the mole ratio represented by SiO 2 / Na 2 O is 3-5, and, SiO 2 concentration is 3 to 15 wt%, manufactured according to any one of items 1 to 6 Method.
8). Ratio of the sodium silicate and the colloidal silica, in terms of the mass ratio of SiO 2 10: 90 to 90: 10, The method according to any one of claim 1 to 7.
9. Item 9. The method according to any one of Items 1 to 8, wherein the acid is sulfuric acid and / or phosphoric acid.
10. 10. The manufacturing method according to any one of Items 1 to 9, wherein the ground pouring material has a pH in the range of 1 to 8 and a SiO 2 concentration in the range of 3 to 15% by mass.

以下、本発明の地盤注入用固結材の製造方法について詳細に説明する。   Hereinafter, the manufacturing method of the consolidation material for ground injection of this invention is demonstrated in detail.

本発明の製造方法は、コロイダルシリカ、珪酸ソーダ及び酸を含有する地盤注入用固結材の製造方法であって、
（１）前記地盤注入用固結材を調製する容器に前記珪酸ソーダに先立って前記コロイダルシリカ又は前記酸を供給開始し、
（２）前記コロイダルシリカ、前記珪酸ソーダ及び前記酸の全てが同時に供給されている期間を有することを特徴とする。 The production method of the present invention is a method for producing a ground-injection consolidated material containing colloidal silica, sodium silicate and an acid,
(1) Start supplying the colloidal silica or the acid prior to the sodium silicate to the container for preparing the consolidation material for ground injection,
(2) It has a period in which all of the colloidal silica, the sodium silicate, and the acid are supplied simultaneously.

上記本発明の地盤注入用固結材の製造方法（以下、「本発明の製造方法」とも言う）は、特に珪酸ソーダに先立ってコロイダルシリカ又は酸を先に供給開始した後、残りの成分を順次供給開始し、コロイダルシリカ、珪酸ソーダ及び酸（以下、これらを「３成分」とも言う）が同時供給されている期間を設定することにより、白濁及び部分ゲルの発生が抑制されている。この製造方法により得られる地盤注入用固結材は均質性が高く、地盤の液状化防止注入工事に適用した際に注入全領域において十分な効果が得られる。また、この製造方法によれば、スタティックミキサー等を用いた連続混合に適用した場合にも均質性の高い地盤注入用固結材が効率的に得られる。   The above-described method for producing a ground-injection consolidation material of the present invention (hereinafter also referred to as “the production method of the present invention”) starts supplying colloidal silica or acid in advance of sodium silicate, and then the remaining components are added. By sequentially starting the supply and setting a period in which colloidal silica, sodium silicate and acid (hereinafter also referred to as “three components”) are simultaneously supplied, the occurrence of white turbidity and partial gel is suppressed. The solid material for ground injection obtained by this manufacturing method has high homogeneity, and when applied to the ground liquefaction prevention injection work, a sufficient effect can be obtained in the entire injection region. Moreover, according to this manufacturing method, a ground injection consolidation material with high homogeneity can be efficiently obtained even when applied to continuous mixing using a static mixer or the like.

上記コロイダルシリカは、コロイド状の性状を示し、それ単独では半永久的にゲル化しない安定な物質である。コロイダルシリカとしては、市販品やそれに水を加えて希釈した希釈溶液を使用できる。   The colloidal silica exhibits a colloidal property and is a stable substance that does not gel semipermanently by itself. As the colloidal silica, a commercially available product or a diluted solution diluted with water can be used.

コロイダルシリカに含まれるシリカ（ＳｉＯ２）の平均粒子径としては、３〜３０ｎｍ程度が好ましく、４〜１５ｎｍ程度がより好ましい。なお、本明細書に記載の平均粒子径は窒素吸着によるＢＥＴ法（但しＢＥＴ法で測定困難な微粒子については動的光散乱法）により測定した値である。 The average particle diameter of silica contained in the colloidal silica (SiO 2), preferably about 3 to 30 nm, about 4~15nm is more preferable. In addition, the average particle diameter described in this specification is a value measured by a BET method by nitrogen adsorption (however, for fine particles difficult to measure by the BET method, a dynamic light scattering method).

コロイダルシリカに含まれるシリカ濃度としては、３〜２５質量％程度が好ましく、４〜１５質量％程度がより好ましい。   As a silica density | concentration contained in colloidal silica, about 3-25 mass% is preferable, and about 4-15 mass% is more preferable.

このようなコロイダルシリカは調製することもできる。例えば、珪酸ソーダの水希釈液をイオン交換により脱アルカリ処理し、次いで得られた活性珪酸にアルカリ剤を添加してｐＨを調整するとともに加熱により造粒することにより調製する。   Such colloidal silica can also be prepared. For example, a water-diluted solution of sodium silicate is dealkalized by ion exchange, and then an alkali agent is added to the obtained active silicic acid to adjust pH and granulate by heating.

上記珪酸ソーダとしても、市販品やそれに水を加えて希釈した希釈溶液を使用できる。   As the sodium silicate, a commercially available product or a diluted solution diluted with water can be used.

珪酸ソーダのモル比（ＳｉＯ２／Ｎａ２Ｏ）は限定されないが、３〜５程度が好ましく、汎用の珪酸ソーダが使えるため、３．１〜３．８程度がより好ましい。 The molar ratio of sodium silicate (SiO 2 / Na 2 O) is not limited, but is preferably about 3 to 5, and more preferably about 3.1 to 3.8 because general-purpose sodium silicate can be used.

珪酸ソーダに含まれるシリカ濃度としては、３〜１５質量％程度が好ましく、４〜１２質量％程度がより好ましい。   The silica concentration contained in the sodium silicate is preferably about 3 to 15% by mass, and more preferably about 4 to 12% by mass.

上記コロイダルシリカと珪酸ソーダの割合（混合割合）は限定されないが、ＳｉＯ２の質量比に換算して１０：９０〜９０：１０程度が好ましく、３０：７０〜７０：３０程度がより好ましい。 The ratio (mixing ratio) of the colloidal silica and sodium silicate is not limited, but is preferably about 10:90 to 90:10, more preferably about 30:70 to 70:30 in terms of the mass ratio of SiO 2 .

上記酸としては限定されないが、硫酸及び／又はリン酸が好ましい。これらの酸は混合して使用できる。これらの酸は濃度が１０質量％以上であることが好ましい。酸の量は、地盤注入用固結材の所望のゲルタイム（即ちｐＨ）に応じて設定する。例えば、本発明の地盤注入用固結材はｐＨが１〜８の範囲が好ましく、このｐＨとなるように酸の含有量を設定することが好ましい。   The acid is not limited, but sulfuric acid and / or phosphoric acid is preferable. These acids can be used in combination. These acids preferably have a concentration of 10% by mass or more. The amount of acid is set according to the desired gel time (that is, pH) of the consolidation material for ground injection. For example, the ground injection consolidation material of the present invention preferably has a pH in the range of 1 to 8, and the acid content is preferably set so as to achieve this pH.

本発明の製造方法では、上記３成分のうち珪酸ソーダに先立ってコロイダルシリカ又は酸を先ず調製容器に供給する。具体的には、次の供給態様が挙げられる。
（Ａ）コロイダルシリカ → 珪酸ソーダ → 酸
（Ｂ）コロイダルシリカ → 酸 → 珪酸ソーダ
（Ｃ）酸 → コロイダルシリカ → 珪酸ソーダ
（Ｄ）酸 → 珪酸ソーダ → コロイダルシリカ
つまり、本発明の製造方法は、上記（Ａ）〜（Ｄ）のいずれかの供給順序で各成分を調製容器に供給し、且つ、上記３成分が同時に供給されている期間を有する。 In the manufacturing method of this invention, colloidal silica or an acid is first supplied to a preparation container prior to sodium silicate among the above three components. Specifically, the following supply mode is mentioned.
(A) Colloidal silica-> sodium silicate-> acid (B) colloidal silica->acid-> sodium silicate (C) acid-> colloidal silica-> sodium silicate (D) acid-> sodium silicate-colloidal silica That is, the production method of the present invention is the above (A) It has the period when each component is supplied to a preparation container in the supply order in any one of (D), and the said 3 components are supplied simultaneously.

コロイダルシリカの供給速度は限定されないが、例えば、地盤注入用固結材を１０００Ｌ調製する場合は、２０〜２００Ｌ／ｍｉｎ程度が好ましく、５０〜１００Ｌ／ｍｉｎ程度がより好ましい。   Although the supply rate of colloidal silica is not limited, for example, in the case of preparing 1000 L of a consolidation material for ground injection, about 20 to 200 L / min is preferable, and about 50 to 100 L / min is more preferable.

珪酸ソーダの供給速度は限定されないが、例えば、地盤注入用固結材を１０００Ｌ調製する場合は、２０〜２００Ｌ／ｍｉｎ程度が好ましく、５０〜１００Ｌ／ｍｉｎ程度がより好ましい。   Although the supply rate of sodium silicate is not limited, for example, in the case of preparing 1000 L of a ground injection consolidated material, about 20 to 200 L / min is preferable, and about 50 to 100 L / min is more preferable.

酸の供給速度は限定されないが、１〜１００Ｌ／ｍｉｎ程度が好ましく、５〜５０Ｌ／ｍｉｎ程度がより好ましい。   Although the supply rate of an acid is not limited, about 1-100 L / min is preferable and about 5-50 L / min is more preferable.

上記（Ａ）〜（Ｄ）の中でも、コロイダルシリカを先に供給する（Ａ）、（Ｂ）の態様が好ましい。これは、調製容器に酸を先に供給する場合には、１）酸濃度が好ましくは１０質量％以上と高いため、容器の材質が金属の場合に腐食させる可能性があること、２）酸を先に供給した状態で撹拌すると作業上の危険が高まること、３）シリカ濃度の高い地盤注入用固結材を調製する場合は、コロイダルシリカ及び珪酸ソーダのシリカ濃度を極力低くする方が部分ゲルの生成を抑えられるため高濃度（６０質量％以上）の酸を用いることが望まれるが、この場合には酸の体積が全体の１０％以下となり初期の撹拌不良となることが挙げられる。   Among the above (A) to (D), the modes (A) and (B) in which colloidal silica is supplied first are preferable. This is because when acid is first supplied to the preparation container, 1) the acid concentration is preferably as high as 10% by mass or more, so that the container may be corroded if it is made of metal, and 2) acid. 3) When preparing a solid injection material with high silica concentration, the silica concentration of colloidal silica and sodium silicate should be reduced as much as possible. In order to suppress the formation of gel, it is desirable to use an acid with a high concentration (60% by mass or more), but in this case, the volume of the acid becomes 10% or less of the whole, resulting in poor initial stirring.

上記（Ａ）、（Ｂ）については、最終製品の白濁を抑制する観点では珪酸ソーダの供給に先立ち、酸を供給する方（即ち（Ｂ））が好ましい。   With respect to the above (A) and (B), it is preferable to supply an acid (ie, (B)) prior to supplying sodium silicate from the viewpoint of suppressing the cloudiness of the final product.

上記（Ａ）の場合には、コロイダルシリカの供給量がその体積の２０％以内の時点で珪酸ソーダの供給を開始し、珪酸ソーダの供給量がその体積の２０％以内の時点で酸の供給を開始することが各成分の供給タイミングとして好ましい。   In the case of (A), the supply of sodium silicate is started when the supply amount of colloidal silica is within 20% of the volume, and the supply of acid is started when the supply amount of sodium silicate is within 20% of the volume. Is preferable as the supply timing of each component.

上記（Ｂ）の場合には、コロイダルシリカの供給量がその体積の２０％以内の時点で酸の供給を開始し、酸の供給量がその体積の２０％以内の時点で珪酸ソーダの供給を開始することが各成分の供給タイミングとして好ましい。   In the case of (B) above, the supply of acid is started when the supply amount of colloidal silica is within 20% of its volume, and the supply of sodium silicate is started when the supply amount of acid is within 20% of its volume. Starting is preferable as the supply timing of each component.

本発明の製造方法では３成分全て供給開始した後、３成分全てが同時に供給されている期間を確保する。なお、３成分の供給終了時は限定されないが、上記（Ａ）、（Ｂ）の場合には、コロイダルシリカの供給期間を最も長く設定し、コロイダルシリカの供給終了と同時又はそれ以前に珪酸ソーダ及び酸の供給が終了するように３成分の供給速度を設定することが調製時間の短縮の点でも好ましい。   In the production method of the present invention, after all three components are supplied, a period in which all three components are supplied simultaneously is ensured. The end of the supply of the three components is not limited, but in the case of the above (A) and (B), the supply period of the colloidal silica is set to be the longest, and at the same time or before the end of the supply of the colloidal silica, sodium silicate In addition, it is also preferable from the viewpoint of shortening the preparation time that the supply speed of the three components is set so that the supply of the acid is completed.

上記３成分を供給・混合することにより地盤注入用固結材は得られる。地盤注入用固結材は白濁及び部分ゲルの発生が抑制されており均質性が高い。なお、白濁及び部分ゲルの発生の有無は目視観察による結果である。得られる地盤注入用固結材は、ｐＨが１〜８程度が好ましく、特に数時間以上のゲルタイムに調整する場合はｐＨが１．５〜５程度がより好ましい。また、地盤注入用固結材の好ましいシリカ濃度は３〜１５質量％程度であり、４〜１２質量％程度がより好ましい。シリカ濃度をこの範囲に設定することにより、液状化防止注入工事に適用した際にゲル強度を十分に確保できる。   By supplying and mixing the above three components, a consolidated material for ground injection can be obtained. The solidification material for ground injection has high homogeneity because the generation of cloudiness and partial gel is suppressed. In addition, the presence or absence of generation of white turbidity and partial gel is a result of visual observation. The obtained ground-injection consolidated material preferably has a pH of about 1 to 8, and more preferably about 1.5 to 5 when adjusting to a gel time of several hours or more. Moreover, the preferable silica density | concentration of the consolidation material for ground injection | pouring is about 3-15 mass%, and about 4-12 mass% is more preferable. By setting the silica concentration within this range, the gel strength can be sufficiently secured when applied to the liquefaction prevention infusion work.

本発明の製造方法は、特に珪酸ソーダに先立ってコロイダルシリカ又は酸を先に供給開始した後、残りの成分を順次供給開始し、コロイダルシリカ、珪酸ソーダ及び酸が同時供給されている期間を設定することにより、白濁及び部分ゲルの発生が抑制されている。この製造方法により得られる地盤注入用固結材は均質性が高く、地盤の液状化防止注入工事に適用した際に注入全領域において十分な効果が得られる。また、この製造方法によれば、スタティックミキサー等を用いた連続混合に適用した場合にも均質性の高い地盤注入用固結材が効率的に得られる。   The production method of the present invention, in particular, starts supplying colloidal silica or acid prior to sodium silicate, then starts supplying the remaining components sequentially, and sets a period in which colloidal silica, sodium silicate and acid are supplied simultaneously. By doing so, generation of white turbidity and partial gel is suppressed. The solid material for ground injection obtained by this manufacturing method has high homogeneity, and when applied to the ground liquefaction prevention injection work, a sufficient effect can be obtained in the entire injection region. Moreover, according to this manufacturing method, a ground injection consolidation material with high homogeneity can be efficiently obtained even when applied to continuous mixing using a static mixer or the like.

以下に実施例及び比較例を示して本発明を具体的に説明する。但し、本発明は実施例に限定されない。   The present invention will be specifically described below with reference to examples and comparative examples. However, the present invention is not limited to the examples.

実施例1-1〜1-4及び比較例1-1〜1-2
コロイダルシリカ、珪酸ソーダ及び硫酸を混合して地盤注入用固結材を調製した。 Examples 1-1 to 1-4 and Comparative Examples 1-1 to 1-2
Colloidal silica, sodium silicate and sulfuric acid were mixed to prepare a solidified material for ground injection.

地盤注入用固結材は、シリカ濃度１０質量％、全量５００ｇ、シリカ中のコロイダルシリカ由来のシリカ分５０質量％、シリカ中の珪酸ソーダ由来のシリカ分５０質量％となるように設定した。各成分の詳細、供給順序、固結材の性状、ｐＨを表１に示す。   The consolidation material for ground injection was set to have a silica concentration of 10% by mass, a total amount of 500 g, a silica content derived from colloidal silica in silica of 50% by mass, and a silica content derived from sodium silicate in silica. Table 1 shows the details of each component, the supply sequence, the properties of the consolidated material, and the pH.

本実施例・比較例では、１番目の成分を調製容器に２０ｇ程度供給した時点で２番目の成分の供給を開始し、２番目の成分２０ｇ程度供給した時点で３番目の成分の供給を開始した。表１に示すように、最初にコロイダルシリカ又は硫酸の供給を開始する方法では良好な混合液（部分ゲルや白濁が認められない）が得られたが（実施例1-1〜1-4）、最初に珪酸ソーダを供給する方法では部分ゲルの生成が見られた（比較例1-1〜1-2）。   In this example / comparative example, supply of the second component is started when about 20 g of the first component is supplied to the preparation container, and supply of the third component is started when about 20 g of the second component is supplied. did. As shown in Table 1, a good mixed solution (partial gel or cloudiness was not recognized) was obtained by the method of starting the supply of colloidal silica or sulfuric acid first (Examples 1-1 to 1-4). In the method of first supplying sodium silicate, partial gel formation was observed (Comparative Examples 1-1 to 1-2).

Figure 2010121083
Figure 2010121083

実施例2-1〜2-2及び比較例2-1
コロイダルシリカ、珪酸ソーダ及び硫酸を混合して地盤注入用固結材を調製した。 Examples 2-1 to 2-2 and Comparative Example 2-1
Colloidal silica, sodium silicate and sulfuric acid were mixed to prepare a solidified material for ground injection.

地盤注入用固結材は、シリカ濃度１０質量％、全量５００ｇ、シリカ中のコロイダルシリカ由来のシリカ分３０質量％、シリカ中の珪酸ソーダ由来のシリカ分７０質量％となるように設定した。各成分の詳細、供給順序、固結材の性状、ｐＨを表２に示す。   The consolidation material for ground injection was set to have a silica concentration of 10% by mass, a total amount of 500 g, a silica content derived from colloidal silica in the silica of 30% by mass, and a silica content derived from sodium silicate in the silica. Table 2 shows the details of each component, the supply sequence, the properties of the consolidated material, and the pH.

本実施例・比較例では、１番目の成分を調製容器に２０ｇ程度供給した時点で２番目の成分の供給を開始し、２番目の成分２０ｇ程度供給した時点で３番目の成分の供給を開始した。表２に示すように、コロイダルシリカ由来のシリカ分３０質量％、珪酸ソーダ由来のシリカ分７０質量％の配合の場合、最初にコロイダルシリカの供給を開始する方法を用いれば良好な混合液（部分ゲルや白濁が認められない）が得られたが（実施例2-1〜2-2）、最初に珪酸ソーダを供給する方法では部分ゲルの生成が見られた（比較例2-1）。   In this example / comparative example, supply of the second component is started when about 20 g of the first component is supplied to the preparation container, and supply of the third component is started when about 20 g of the second component is supplied. did. As shown in Table 2, in the case of the blending of 30% by mass of silica derived from colloidal silica and 70% by mass of silica derived from sodium silicate, if a method of starting the supply of colloidal silica first is used, a good mixed liquid (partial Gel or white turbidity was not observed) (Examples 2-1 to 2-2), but in the method in which sodium silicate was first supplied, partial gel formation was observed (Comparative Example 2-1).

Figure 2010121083
Figure 2010121083

実施例３及び比較例３
コロイダルシリカ、珪酸ソーダ及び硫酸を混合して地盤注入用固結材を調製した。 Example 3 and Comparative Example 3
Colloidal silica, sodium silicate and sulfuric acid were mixed to prepare a solidified material for ground injection.

地盤注入用固結材は、シリカ濃度９．６質量％、全量８００Ｌ、シリカ中のコロイダルシリカ由来のシリカ分５０質量％、シリカ中の珪酸ソーダ由来のシリカ分５０質量％となるように設定した。各成分の詳細、供給順序、固結材の性状、ｐＨを表３に示す。
（実施例３）
シリカ濃度１０．３質量％に希釈した平均粒径１２ｎｍの市販のコロイダルシリカ３９３Ｌを流速５７Ｌ／ｍｉｎで調製容器に供給開始し、撹拌を開始した。コロイダルシリカが５０Ｌ程度供給された時点で、シリカ濃度９．２質量％に希釈した市販の５号珪酸ソーダ（モル比３．７）３９３Ｌを流速６７Ｌ／ｍｉｎで供給開始した。珪酸ソーダが５０Ｌ程度供給された時点で７０質量％硫酸１７．９Ｌを６Ｌ／ｍｉｎで供給開始した。硫酸、珪酸ソーダ、コロイダルシリカの順に供給が終わり、シリカ濃度９．６質量％の良好な地盤注入用固結材（部分ゲルや白濁が認められない）約８００Ｌを得た。
（比較例３）
シリカ濃度１０．３質量％に希釈した平均粒径１２ｎｍの市販のコロイダルシリカ３９３Ｌを流速５７Ｌ／ｍｉｎで調製容器に供給開始し、撹拌を開始した。コロイダルシリカが５０Ｌ程度供給された時点で、シリカ濃度９．２質量％に希釈した市販の５号珪酸ソーダ（モル比３．７）３９３Ｌを流速６７Ｌ／ｍｉｎで供給開始し、コロイダルシリカと珪酸ソーダを調製容器に全量供給した。その後で７０質量％硫酸１７．９Ｌを６Ｌ／ｍｉｎで供給した。シリカ濃度９．６質量％の地盤注入用固結材約８００Ｌを得たが、部分ゲルの多いものとなった。 The consolidation material for ground injection was set so that the silica concentration was 9.6% by mass, the total amount was 800 L, the silica content derived from colloidal silica in the silica was 50% by mass, and the silica content derived from sodium silicate in the silica was 50% by mass. . Table 3 shows the details of each component, the supply sequence, the properties of the consolidated material, and the pH.
(Example 3)
393 L of commercially available colloidal silica having an average particle diameter of 12 nm diluted to a silica concentration of 10.3 mass% was started to be supplied to the preparation container at a flow rate of 57 L / min, and stirring was started. When about 50 L of colloidal silica was supplied, 393 L of commercially available No. 5 sodium silicate (molar ratio 3.7) diluted to a silica concentration of 9.2% by mass was started at a flow rate of 67 L / min. When about 50 L of sodium silicate was supplied, 17.9 L of 70 mass% sulfuric acid was started to be supplied at 6 L / min. Supply in the order of sulfuric acid, sodium silicate, and colloidal silica was completed, and about 800 L of a solid injection material (partial gel or cloudiness was not recognized) having a silica concentration of 9.6% by mass was obtained.
(Comparative Example 3)
393 L of commercially available colloidal silica having an average particle diameter of 12 nm diluted to a silica concentration of 10.3 mass% was started to be supplied to the preparation container at a flow rate of 57 L / min, and stirring was started. When about 50 L of colloidal silica was supplied, 393 L of commercially available sodium silicate 5 (molar ratio 3.7) diluted to a silica concentration of 9.2% by mass was started at a flow rate of 67 L / min, and colloidal silica and sodium silicate were supplied. Was supplied to the preparation container. Thereafter, 17.9 L of 70 mass% sulfuric acid was supplied at 6 L / min. About 800 L of a ground injection consolidated material having a silica concentration of 9.6% by mass was obtained, but the amount of partial gel was increased.

Figure 2010121083
Figure 2010121083

実施例4-1〜4-3
コロイダルシリカ、珪酸ソーダ及び酸を混合して地盤注入用固結材を調製した。 Examples 4-1 to 4-3
Colloidal silica, sodium silicate, and acid were mixed to prepare a solidified material for ground injection.

地盤注入用固結材は、シリカ濃度１０質量％、全量５００ｇ、シリカ中のコロイダルシリカ由来のシリカ分５０質量％、シリカ中の珪酸ソーダ由来のシリカ分５０質量％となるように設定した。各成分の詳細、供給順序、固結材の性状、ｐＨを表４に示す。   The consolidation material for ground injection was set to have a silica concentration of 10% by mass, a total amount of 500 g, a silica content derived from colloidal silica in silica of 50% by mass, and a silica content derived from sodium silicate in silica. Table 4 shows the details of each component, the order of supply, the properties of the consolidated material, and the pH.

本実施例では、１番目の成分を調製容器に２０ｇ程度供給した時点で２番目の成分の供給を開始し、２番目の成分２０ｇ程度供給した時点で３番目の成分の供給を開始した。表４に示すように、珪酸ソーダとして３号珪酸ソーダ（モル比３．１６）を使用した場合（実施例4-1）、酸としてリン酸を使用した場合（実施例4-2）、コロイダルシリカとして粒径の小さなもの（平均粒径５ｎｍ）を使用した場合（実施例4-3）のいずれにおいても良好な混合液（部分ゲルや白濁が認められない）が得られた。   In this example, the supply of the second component was started when about 20 g of the first component was supplied to the preparation container, and the supply of the third component was started when about 20 g of the second component was supplied. As shown in Table 4, when No. 3 sodium silicate (molar ratio 3.16) was used as sodium silicate (Example 4-1), when phosphoric acid was used as acid (Example 4-2), colloidal In any case where silica having a small particle size (average particle size of 5 nm) was used (Example 4-3), a good mixed solution (no partial gel or cloudiness was observed) was obtained.

Figure 2010121083
Figure 2010121083

Claims (10)

コロイダルシリカ、珪酸ソーダ及び酸を含有する地盤注入用固結材の製造方法であって、
（１）前記地盤注入用固結材を調製する容器に前記珪酸ソーダに先立って前記コロイダルシリカ又は前記酸を供給開始し、
（２）前記コロイダルシリカ、前記珪酸ソーダ及び前記酸の全てが同時に供給されている期間を有することを特徴とする製造方法。 A method for producing a ground-injection consolidated material containing colloidal silica, sodium silicate and acid,
(1) Start supplying the colloidal silica or the acid prior to the sodium silicate to the container for preparing the consolidation material for ground injection,
(2) The manufacturing method characterized by having the period when all the said colloidal silica, the said sodium silicate, and the said acid are supplied simultaneously. 前記コロイダルシリカを供給開始した後、前記珪酸ソーダ、前記酸の順に供給開始する、請求項１に記載の製造方法。   The manufacturing method according to claim 1, wherein after starting the supply of the colloidal silica, the supply is started in the order of the sodium silicate and the acid. 前記コロイダルシリカを供給開始した後、前記酸、前記珪酸ソーダの順に供給開始する、請求項１に記載の製造方法。   The production method according to claim 1, wherein after the colloidal silica is started to be supplied, the supply is started in the order of the acid and the sodium silicate. 前記酸を供給開始した後、前記珪酸ソーダ、前記コロイダルシリカの順に供給開始する、請求項１に記載の製造方法。   The manufacturing method according to claim 1, wherein after the supply of the acid is started, the supply is started in the order of the sodium silicate and the colloidal silica. 前記酸を供給開始した後、前記コロイダルシリカ、前記珪酸ソーダの順に供給開始する、請求項１に記載の製造方法。   The manufacturing method according to claim 1, wherein after the supply of the acid is started, the supply is started in the order of the colloidal silica and the sodium silicate. 前記コロイダルシリカは、ＳｉＯ２の平均粒子径が３〜３０ｎｍであり、且つ、ＳｉＯ２濃度が３〜２５質量％である、請求項１〜５のいずれかに記載の製造方法。 The colloidal silica has an average particle diameter of SiO 2 is 3 to 30 nm, and, SiO 2 concentration is 3 to 25 mass%, the production method according to any one of claims 1 to 5. 前記珪酸ソーダは、ＳｉＯ２／Ｎａ２Ｏで表されるモル比が３〜５であり、且つ、ＳｉＯ２濃度が３〜１５質量％である、請求項１〜６のいずれかに記載の製造方法。 The sodium silicate is the mole ratio represented by SiO 2 / Na 2 O is 3-5, and, SiO 2 concentration is 3 to 15 wt%, manufactured according to any one of claims 1 to 6 Method. 前記コロイダルシリカと前記珪酸ソーダの割合は、ＳｉＯ２の質量比に換算して１０：９０〜９０：１０である、請求項１〜７のいずれかに記載の製造方法。 Ratio of the sodium silicate and the colloidal silica, in terms of the mass ratio of SiO 2 10: 90 to 90: 10, The method according to any one of claims 1 to 7. 前記酸は、硫酸及び／又はリン酸である、請求項１〜８のいずれかに記載の製造方法。   The said acid is a manufacturing method in any one of Claims 1-8 which is a sulfuric acid and / or phosphoric acid. 前記地盤注入用固結材は、ｐＨが１〜８の範囲でありＳｉＯ２濃度が３〜１５質量％の範囲である、請求項１〜９のいずれかに記載の製造方法。 The ground injection solid Yuizai is, pH ranges and SiO 2 concentration of 3 to 15% by weight in the range of 1 to 8, The process according to any one of claims 1 to 9.
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