JP2011241305A - Method of manufacturing solidifying material for grouting - Google Patents
Method of manufacturing solidifying material for grouting Download PDFInfo
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- JP2011241305A JP2011241305A JP2010114948A JP2010114948A JP2011241305A JP 2011241305 A JP2011241305 A JP 2011241305A JP 2010114948 A JP2010114948 A JP 2010114948A JP 2010114948 A JP2010114948 A JP 2010114948A JP 2011241305 A JP2011241305 A JP 2011241305A
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- 239000000463 material Substances 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 239000002253 acid Substances 0.000 claims abstract description 68
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000011550 stock solution Substances 0.000 claims abstract description 27
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000008119 colloidal silica Substances 0.000 claims abstract description 23
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 21
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 21
- 239000007864 aqueous solution Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 42
- 239000007924 injection Substances 0.000 claims description 42
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 22
- 238000007596 consolidation process Methods 0.000 claims description 17
- 239000000377 silicon dioxide Substances 0.000 claims description 16
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 239000000243 solution Substances 0.000 abstract description 9
- 230000002265 prevention Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 235000019353 potassium silicate Nutrition 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004438 BET method Methods 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000012445 acidic reagent Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000002296 dynamic light scattering Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
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。また、従来の製造方法では水を単独成分として取扱っておらず、コロイダルシリカ、水ガラス及び酸の希釈に予め使われており、有効成分を精度良く計量することが困難な場合がある。特に酸の計量精度が悪い場合には、得られる地盤注入用固結材のｐＨを所望の範囲に調整し難く、所望のゲルタイムに調整することが困難となる。 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. Moreover, in the conventional manufacturing method, water is not handled as a single component, but is used in advance for dilution of colloidal silica, water glass, and acid, and it may be difficult to accurately measure the active ingredient. In particular, when the accuracy of acid measurement is poor, it is difficult to adjust the pH of the obtained ground-injection consolidated material to a desired range, and it is difficult to adjust it to a desired gel time.
従って、白濁や部分ゲルの発生が抑制され、所望のｐＨを有する均質な地盤注入用固結材を精度良く調製するための製造方法の開発が望まれている。 Accordingly, development of a production method for accurately preparing a homogeneous ground-injection solidifying material having a desired pH, in which the occurrence of white turbidity and partial gel is suppressed, is desired.
本発明は、白濁や部分ゲルの発生が抑制され、所望のｐＨを有する均質な地盤注入用固結材を精度良く調製するための製造方法を提供することを目的とする。 An object of the present invention is to provide a production method for accurately preparing a homogeneous ground-injection solidifying material having a desired pH, in which the occurrence of white turbidity and partial gel is 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、及び酸濃度が４〜３５質量％の酸水溶液を混合する地盤注入用固結材の製造方法であって、
（１）前記酸水溶液を調製するために用いる、酸濃度が５０〜８０質量％の酸原液及び水を予め別々に計量しておき、
（２）前記地盤注入用固結材を調製する容器に、先ず前記水を供給開始した後、前記酸原液を供給開始し、次いで残りの成分を順不同で供給開始する、
ことを特徴とする地盤注入用固結材の製造方法。
２．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５〜３０質量％である、上記項１に記載の製造方法。
３．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又は２に記載の製造方法。
４．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１〜３のいずれかに記載の製造方法。
５．前記酸は、硫酸及び／又はリン酸である、上記項１〜４のいずれかに記載の製造方法。
６．前記地盤注入用固結材は、ｐＨが１〜５の範囲でありＳｉＯ２濃度が３〜１５質量％の範囲である、上記項１〜５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-injected consolidated material comprising mixing colloidal silica, sodium silicate, and an acid aqueous solution having an acid concentration of 4 to 35% by mass,
(1) An acid stock solution having an acid concentration of 50 to 80% by mass and water used for preparing the acid aqueous solution are separately weighed in advance,
(2) After starting the supply of the water to the container for preparing the consolidation material for ground injection, the supply of the acid stock solution is started, and then the remaining components are started to be supplied in any order.
A method for producing a consolidated material for ground injection, which is characterized by the above.
2. The colloidal silica has an average particle diameter of SiO 2 is 3 to 30 nm, and, SiO 2 concentration of 5 to 30 mass%, the production method according to 1.
3. 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 mass%, the production method according to 1 or 2.
4). 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 3.
5). Item 5. The method according to any one of Items 1 to 4, wherein the acid is sulfuric acid and / or phosphoric acid.
6). Item 6. The method according to any one of Items 1 to 5, wherein the ground pouring material has a pH in the range of 1 to 5 and a SiO2 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.
本発明の地盤注入用固結材の製造方法は、コロイダルシリカ、珪酸ソーダ、及び酸濃度が４〜３５質量％の酸水溶液を混合する地盤注入用固結材の製造方法であって、
（１）前記酸水溶液を調製するために用いる、酸濃度が５０〜８０質量％の酸原液及び水を予め別々に計量しておき、
（２）前記地盤注入用固結材を調製する容器に、先ず前記水を供給開始した後、前記酸原液を供給開始し、次いで残りの成分を順不同で供給開始する、
ことを特徴とする地盤注入用固結材の製造方法。
The method for producing a ground-injected consolidated material of the present invention is a method for producing a ground-injected consolidated material in which colloidal silica, sodium silicate, and an acid aqueous solution having an acid concentration of 4 to 35% by mass are mixed.
(1) An acid stock solution having an acid concentration of 50 to 80% by mass and water used for preparing the acid aqueous solution are separately weighed in advance,
(2) After starting the supply of the water to the container for preparing the consolidation material for ground injection, the supply of the acid stock solution is started, and then the remaining components are started to be supplied in any order.
A method for producing a consolidated material for ground injection, which is characterized by the above.
上記特徴を有する本発明の製造方法は、酸濃度が４〜３５質量％の酸水溶液を調製するために用いる、酸濃度が５０〜８０質量％の酸原液及び水を予め別々に計量するため、酸原液及び水の計量精度が高く、地盤注入用固結材のｐＨを所望の範囲に調整し易い。よって、所望のゲルタイムを有する地盤注入用固結材を精度良く調製することができる。また、水及び酸原液を順に供給開始し、その後に残りの成分を順不同で供給開始するため、白濁及び部分ゲルの発生を抑制して地盤注入用固結材を調製することができる。 The production method of the present invention having the above characteristics is used for preparing an acid aqueous solution having an acid concentration of 4 to 35% by mass, and separately measuring an acid stock solution and water having an acid concentration of 50 to 80% by mass in advance, The measurement accuracy of the acid stock solution and water is high, and it is easy to adjust the pH of the consolidation material for ground injection to a desired range. Therefore, a ground injection consolidated material having a desired gel time can be accurately prepared. Moreover, since supply of water and an acid stock solution is started in order, and then the remaining components are started to be supplied in random order, it is possible to prepare a consolidated material for ground injection while suppressing the occurrence of white turbidity and partial gel.
この製造方法により得られる地盤注入用固結材は、ｐＨを含めて均質性が高く、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。 The consolidation material for ground injection obtained by this manufacturing method has high homogeneity including pH, and a sufficient effect can be obtained in the entire injection region when applied to ground liquefaction prevention injection work.
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、５〜３０質量％程度が好ましい。 As a silica density | concentration contained in colloidal silica, about 5-30 mass% is 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％程度が好ましい。 The silica concentration contained in the sodium silicate is preferably about 3 to 15% 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、２０：８０〜６０：４０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 20:80 to 60:40 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。これらの酸は複数種類を混合して使用することもできる。本発明における酸原液としては、酸濃度が５０〜８０質量％の酸原液が使用でき、市販品をそのまま使用できる。酸原液の量は、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。 The acid is not limited, but sulfuric acid and / or phosphoric acid is preferable. These acids can be used in combination of a plurality of types. As the acid stock solution in the present invention, an acid stock solution having an acid concentration of 50 to 80% by mass can be used, and a commercially available product can be used as it is. The amount of the acid stock solution is set according to the desired gel time (that is, pH) of the consolidation material for ground injection.
本発明では、地盤注入用固結材を製造するに際し、酸濃度が４〜３５質量％の酸水溶液を用いるが、前記酸水溶液を調製するために用いる、酸濃度が５０〜８０質量％の酸原液及び水を予め別々に計量しておく。予め別々に計量しておくことにより、酸原液及び水の計量精度が高く、地盤注入用固結材のｐＨを所望の範囲に調整し易い。よって、所望のゲルタイムを有する地盤注入用固結材を精度良く調製することができる。他方、予め別々に計量せずに酸原液及び水を同一容器に混合して合算量で計量すると、酸水溶液中の酸の濃度を一定に調整し難く、ｐＨを均一に調整し難い。 In the present invention, an acid aqueous solution having an acid concentration of 4 to 35% by mass is used for producing a ground injection consolidated material, and an acid having an acid concentration of 50 to 80% by mass used for preparing the acid aqueous solution. Weigh stock solution and water separately in advance. By weighing separately in advance, the measurement accuracy of the acid stock solution and water is high, and it is easy to adjust the pH of the consolidation material for ground injection to a desired range. Therefore, a ground injection consolidated material having a desired gel time can be accurately prepared. On the other hand, when the acid stock solution and water are mixed in the same container and weighed in a combined amount without separately measuring in advance, it is difficult to adjust the acid concentration in the acid aqueous solution to be constant and it is difficult to adjust the pH uniformly.
また、本発明では、先ず水を調製容器に供給開始した後、酸原液を供給開始し、次いで残りの成分を順不同で調製容器に供給開始する。 In the present invention, first, supply of water to the preparation container is started, then supply of the acid stock solution is started, and then the remaining components are started to be supplied to the preparation container in random order.
つまり、各成分の供給順序は次の通りである。
（Ａ）水 → 酸原液 → コロイダルシリカ → 珪酸ソーダ、又は
（Ｂ）水 → 酸原液 → 珪酸ソーダ → コロイダルシリカ。
That is, the supply order of each component is as follows.
(A) Water-> acid stock solution-> colloidal silica-> sodium silicate, or (B) water-> acid stock solution-> sodium silicate-> colloidal silica.
水を供給開始した後、水の供給が完了した後に酸原液を供給開始してもよく、又は水の供給途中において酸原液を供給開始してもよい。残りの成分についても、酸原液の供給が完了した後に供給開始してもよく、又は酸原料の供給途中において供給開始してもよい。なお、効率的に各成分を混合するとともに酸原液の供給による調製容器の腐食等の発生を効果的に抑制するためには、水を５０質量％以上供給した後に酸原液及び残りの成分を順に供給開始することが好ましく、単独成分としての水の量は、地盤注入用固結材に含まれる水の全量の５〜２５質量％であることが好ましい。 After starting the supply of water, the supply of the acid stock solution may be started after the supply of water is completed, or the supply of the acid stock solution may be started during the supply of water. The remaining components may be supplied after the supply of the acid stock solution is completed, or may be started during the supply of the acid raw material. In addition, in order to mix each component efficiently and to effectively prevent the occurrence of corrosion of the preparation container due to the supply of the acid stock solution, after supplying 50% by mass or more of water, the acid stock solution and the remaining components are sequentially added. It is preferable to start the supply, and the amount of water as a single component is preferably 5 to 25% by mass of the total amount of water contained in the consolidated material for ground injection.
水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、２０〜１０００Ｌ／ｍｉｎ程度が好ましく、５０〜５００Ｌ／ｍｉｎ程度がより好ましい。 Although the supply rate of water is not limited, for example, in the case of preparing 1000 L of a consolidation material for ground injection, about 20 to 1000 L / min is preferable, and about 50 to 500 L / min is more preferable.
酸原液の供給速度は限定されないが、５〜２００Ｌ／ｍｉｎ程度が好ましく、１０〜１００Ｌ／ｍｉｎ程度がより好ましい。 The supply rate of the acid stock solution is not limited, but is preferably about 5 to 200 L / min, and more preferably about 10 to 100 L / min.
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、５０〜１５００Ｌ／ｍｉｎ程度が好ましく、１００〜１０００Ｌ／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 50 to 1500 L / min is preferable, and about 100 to 1000 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、５０〜１５００Ｌ／ｍｉｎ程度が好ましく、１００〜１０００Ｌ／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 filler, about 50 to 1500 L / min is preferable, and about 100 to 1000 L / min is more preferable.
上記供給速度で各成分を供給することにより、更に白濁及び部分ゲルの発生を抑制することができる。 By supplying each component at the above supply rate, the occurrence of white turbidity and partial gel can be further suppressed.
上記成分を供給・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１〜５程度が好ましく、ｐＨが２〜４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。 A consolidated material for ground injection can be obtained by supplying and mixing the above components. 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 pouring material has a pH of preferably about 1 to 5, more preferably about 2 to 4. 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、酸濃度が４〜３５質量％の酸水溶液を調製するために用いる、酸濃度が５０〜８０質量％の酸原液及び水を予め別々に計量するため、酸原液及び水の計量精度が高く、地盤注入用固結材のｐＨを所望の範囲に調整し易い。よって、所望のゲルタイムを有する地盤注入用固結材を精度良く調製することができる。また、水及び酸原液を順に供給開始し、その後に残りの成分を順不同で供給開始するため、白濁及び部分ゲルの発生を抑制して地盤注入用固結材を調製することができる。 In the production method of the present invention, an acid stock solution and water used for preparing an acid aqueous solution having an acid concentration of 4 to 35% by mass, and an acid stock solution and water having an acid concentration of 50 to 80% by mass are separately measured in advance. Therefore, it is easy to adjust the pH of the consolidation material for ground injection to a desired range. Therefore, a ground injection consolidated material having a desired gel time can be accurately prepared. Moreover, since supply of water and an acid stock solution is started in order, and then the remaining components are started to be supplied in random order, it is possible to prepare a consolidated material for ground injection while suppressing the occurrence of white turbidity and partial gel.
この製造方法により得られる地盤注入用固結材は、ｐＨを含めて均質性が高く、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。 The consolidation material for ground injection obtained by this manufacturing method has high homogeneity including pH, and a sufficient effect can be obtained in the entire injection region when applied to ground liquefaction prevention injection work.
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１〜４及び比較例１〜２
コロイダルシリカ、珪酸ソーダ、硫酸（酸原料）及び水を混合して地盤注入用固結材を調製した。実施例１〜４では、硫酸及び水を予め別々の容器で計量した。これに対して、比較例１〜２では、硫酸及び水を同一容器に順次注ぎ足して合算量で計量した。
Examples 1-4 and Comparative Examples 1-2
Colloidal silica, sodium silicate, sulfuric acid (acid raw material), and water were mixed to prepare a consolidated material for ground injection. In Examples 1-4, sulfuric acid and water were measured in advance in separate containers. On the other hand, in Comparative Examples 1 and 2, sulfuric acid and water were sequentially added to the same container, and the total amount was measured.
地盤注入用固結材は、シリカ濃度１０質量％、全量５００ｋｇ、シリカ中のコロイダルシリカ由来のシリカ分２５又は５０質量％、シリカ中の珪酸ソーダ由来のシリカ分５０又は７５質量％となるように設定した。 The consolidation material for ground injection has a silica concentration of 10 mass%, a total amount of 500 kg, a silica content of 25 or 50 mass% derived from colloidal silica in silica, and a silica content of 50 or 75 mass% derived from sodium silicate in silica. Set.
各成分の詳細、供給順序、固結材の性状、ｐＨを表１に示す。 Table 1 shows the details of each component, the supply sequence, the properties of the consolidated material, and the pH.
実施例１〜４では、先ず水を供給開始し、次に硫酸を供給開始した後に、残りの成分を供給開始することにより、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。詳細には、水を約５０％供給した時点で硫酸の供給を開始し、残りの成分をそれぞれ数秒の間隔を開けて順次供給を開始した。 In Examples 1 to 4, a good mixed solution (partial gel or white turbidity is not recognized) is obtained by starting the supply of water first and then the supply of sulfuric acid and then the supply of the remaining components. It was. Specifically, when about 50% of water was supplied, the supply of sulfuric acid was started, and the remaining components were sequentially supplied at intervals of several seconds.
これに対し、硫酸及び水を予め別々の容器で計量しない比較例１〜２では、硫酸及び水の計量精度が不十分であり、所望のｐＨが得られないばかりか、部分ゲルの生成も認められた。 On the other hand, in Comparative Examples 1 and 2 in which sulfuric acid and water are not weighed in separate containers in advance, the measurement accuracy of sulfuric acid and water is insufficient, and a desired pH cannot be obtained, and the formation of a partial gel is also recognized. It was.
Claims (6)
（１）前記酸水溶液を調製するために用いる、酸濃度が５０〜８０質量％の酸原液及び水を予め別々に計量しておき、
（２）前記地盤注入用固結材を調製する容器に、先ず前記水を供給開始した後、前記酸原液を供給開始し、次いで残りの成分を順不同で供給開始する、
ことを特徴とする地盤注入用固結材の製造方法。 A method for producing a ground-injected consolidated material comprising mixing colloidal silica, sodium silicate, and an acid aqueous solution having an acid concentration of 4 to 35% by mass,
(1) An acid stock solution having an acid concentration of 50 to 80% by mass and water used for preparing the acid aqueous solution are separately weighed in advance,
(2) After starting the supply of the water to the container for preparing the consolidation material for ground injection, the supply of the acid stock solution is started, and then the remaining components are started to be supplied in any order.
A method for producing a consolidated material for ground injection, which is characterized by the above.
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| JP2013189539A (en) * | 2012-03-13 | 2013-09-26 | Fuji Kagaku Kk | Solidifying material for ground grouting and method for manufacturing the same |
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| JP2016153499A (en) * | 2016-03-28 | 2016-08-25 | 富士化学株式会社 | Method for manufacturing solidifying material for grouting |
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