JP3190109B2 - Cement additive for ultra high pressure jet injection method - Google Patents
Cement additive for ultra high pressure jet injection methodInfo
- Publication number
- JP3190109B2 JP3190109B2 JP12098292A JP12098292A JP3190109B2 JP 3190109 B2 JP3190109 B2 JP 3190109B2 JP 12098292 A JP12098292 A JP 12098292A JP 12098292 A JP12098292 A JP 12098292A JP 3190109 B2 JP3190109 B2 JP 3190109B2
- Authority
- JP
- Japan
- Prior art keywords
- additive
- cement
- hardening material
- high pressure
- present
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は軟弱地盤改良の地下工法
における超高圧噴流注入工法用のセメント添加剤に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement additive for an ultra-high pressure jet injection method in an underground method for improving soft ground.
【０００２】[0002]
【従来の技術】超高圧噴流注入工法とは、地上から地中
深くまで直径15cm程度の小さな孔を開け、その中に管
（２重乃至３重の管）を通してセメント系硬化材を超高
圧（200〜700kg/cm2 ) ジェットの噴流体として送り、
回りの土砂を削りとり、硬化材と置換しながら土砂を地
上に排出し、地中に柱体や壁体を構築する軟弱地盤の改
良工法である。2. Description of the Related Art An ultra-high pressure jet injection method is a method in which a small hole having a diameter of about 15 cm is drilled from the ground to deep into the ground, and a hardened cementitious material is passed through a pipe (double or triple pipe) into the hole. 200-700kg / cm 2 )
This is a method of improving soft ground by shaving off surrounding soil and discharging the soil to the ground while replacing it with hardened material, and constructing columns and walls underground.
【０００３】この工法には高流動性のセメント系硬化材
（以下、硬化材と称す）が要求されることから、従来こ
の目的でセメント系硬化材に添加する剤として基準強度
（28日後の強度＝30kg/cm2以上）を満足し、流動効果の
あるナフタレンスルホン酸塩ホルムアルデヒド縮合物
（以下ナフタレン系と称す）が添加剤として使用されて
いる。[0003] Since this method requires a cement-based hardening material having high fluidity (hereinafter referred to as a hardening agent), a standard strength (strength after 28 days) is conventionally used as an additive to the cement-based hardening material for this purpose. = 30 kg / cm 2 or more), and a naphthalene sulfonate formaldehyde condensate (hereinafter referred to as naphthalene-based) having a fluidity effect is used as an additive.
【０００４】[0004]
【発明が解決しようとする課題】さらに、この工法では
ジェット噴流体として注入する硬化材の一部は、切削し
た土砂と混合して地上へ排出する必要があり、硬化材に
対する添加剤の特性としては排泥液の粘性を下げる作用
も要求される。Further, in this method, a part of the hardening material injected as a jet jet fluid needs to be mixed with the cut earth and sand and discharged to the ground. Is also required to reduce the viscosity of the sludge.
【０００５】しかしながら、従来のナフタレン系添加剤
では注入時の硬化材の粘性低下能は大きいものの、粘土
質に対する減粘効果は小さいことから排泥液の粘性が下
がらずに排出が困難な状況である。その結果、硬化材の
注入効率が低下するばかりではなく、硬化材が土中にお
いて設計外へ拡散したり、それにともない表層部へ突出
するなどの現象が生じ、問題となっている。[0005] However, although the conventional naphthalene-based additive has a large ability to lower the viscosity of the hardening material at the time of injection, it has a small viscosity-reducing effect on the clay, so that it is difficult to discharge the sludge fluid without lowering its viscosity. is there. As a result, not only does the efficiency of injection of the hardening material decrease, but also the phenomenon occurs such that the hardening material diffuses out of the design in the soil, and accordingly projects to the surface layer portion.
【０００６】[0006]
【課題を解決するための手段】上記問題点に鑑み、本発
明者らは硬化材の高流動性と粘土質に対する減粘性の両
性能を併せもち、基準強度（28日後の強度＝30kg/cm2以
上）を満足する添加剤を目標に鋭意検討の結果、本発明
を完成するに到ったものである。SUMMARY OF THE INVENTION In view of the above problems, the present inventors have both high fluidity of a hardening material and low viscosity to clay, and have a standard strength (strength after 28 days = 30 kg / cm). The present invention has been completed as a result of intensive studies aimed at additives satisfying ( 2 ) or more.
【０００７】即ち、本発明は、下記（ａ）と（ｂ）の二
成分からなり、（ａ）成分と（ｂ）成分の割合が重量比
で（ａ）：（ｂ）＝70〜95：30〜５であることを特徴と
する超高圧噴流注入工法用セメント添加剤に関する。Namely, the present invention is Ri Do bicomponent following (a) and (b), (a) the proportion of component and component (b) weight ratio
In (a) :( b) = 70~95 : a 30-5 der Rukoto about ultra-high pressure jet grouting cement additives, wherein.
【０００８】（ａ）成分：ナフタレンスルホン酸ホルム
アルデヒド縮合物の水溶性塩 （ｂ）成分：タンニン酸 本発明の添加剤は硬化材に優れた高流動性を賦与し、し
かも粘土質の減粘性にも優れた効果を与えるものであ
る。Component (a): water-soluble salt of a naphthalenesulfonic acid formaldehyde condensate (b) Component: tannic acid The additive of the present invention imparts an excellent high fluidity to a hardening material and reduces viscosity of clay. Also gives excellent effects.
【０００９】一般に水系におけるセメント粒子や無機粒
子の流動性や減粘性の現象は分散作用によるもので、そ
の分散メカニズムは粒子表面の荷電力による電気的反発
によって決まるものと説明されている。本発明者らはセ
メント粒子と粘土粒子の両者に対し分散性を与え、且つ
セメントを分散させた後に、さらに粘土物質を分散させ
る効果のある添加剤の検討を行い、本発明を完成したも
のであり、この添加剤はナフタレン系や一般の分散剤で
は得られない性能を示すものである。前述の分散理論で
説明するならば、本発明の二成分添加剤は粒子表面に電
荷を与え、分散させているものであるが、硬化材中のセ
メントと地中粘土の両物質に対する吸着速度や吸着形態
が一般の分散剤とは異なっているものと推察される。In general, it is described that the phenomena of fluidity and viscosity reduction of cement particles and inorganic particles in an aqueous system are due to a dispersing action, and the dispersing mechanism is determined by electric repulsion due to the electric power of the particle surface. The inventors of the present invention provided dispersibility to both cement particles and clay particles, and after dispersing the cement, studied additives having an effect of further dispersing the clay material, and completed the present invention. This additive has a performance that cannot be obtained with a naphthalene-based or general dispersant. According to the dispersion theory described above, the two-component additive of the present invention imparts a charge to the particle surface and disperses it. It is inferred that the adsorption form is different from a general dispersant.
【００１０】即ち、本発明の添加剤は、まず硬化材中の
セメントに吸着して硬化材に流動性を与え、この時点で
粘土に吸着する成分を残す。次いで、粘土物質との接触
時点で残成分が吸着して減粘性を示すものであり、本発
明は添加剤の二成分が硬化材と粘土質の両者に対して経
時的吸着と分散を行うことにより有効に作用しているも
のと推定される。That is, the additive of the present invention first adsorbs to the cement in the hardening material to give fluidity to the hardening material, and at this point, the component adsorbed to the clay remains. Then, the remaining components are adsorbed at the time of contact with the clay substance and exhibit viscosity, and the present invention is based on the fact that the two components of the additive perform adsorption and dispersion with time on both the hardening material and the clay material. Is presumed to be acting effectively.
【００１１】本発明の超高圧噴流注入工法用添加剤の
（ａ）成分であるナフタレンスルホン酸塩ホルムアルデ
ヒド縮合物としては、例えば、花王（株）製の商品名
「マイテイ150」、山陽国策パルプ（株）製の商品名
「サンフローＰＳ」等が用いられる。塩類としては、水
溶性のアルカリ金属塩であれば特に限定するものではな
い。As the naphthalene sulfonate formaldehyde condensate which is the component (a) of the additive for the ultra-high pressure jet injection method of the present invention, for example, the product name “Mighty 150” manufactured by Kao Corporation, Sanyo Kokusaku Pulp ( Co., Ltd. product name "Sunflow PS" or the like is used. The salts are not particularly limited as long as they are water-soluble alkali metal salts.
【００１２】本発明の（ｂ）成分は、タンニン酸であ
り、公知の方法で製造される水溶性の物質、例えば、化
学工業日報社発刊「11290の化学商品」P.1416〜1417に
記載されているものが用いられる。本発明の添加剤の添
加量は硬化材中のセメントに対して有効成分換算で0.2
重量％〜4.0重量％の範囲が好ましく、0.5重量％〜2.0
重量％がさらに好ましい。The component (b) of the present invention is tannic acid, which is a water-soluble substance produced by a known method, for example, described in “Chemical Products of 11290” published by Chemical Daily Co., Ltd., pp. 1416-1417. Is used. The additive amount of the additive of the present invention is 0.2% in terms of the active ingredient with respect to the cement in the hardening material.
% By weight to 4.0% by weight, preferably 0.5% to 2.0% by weight.
% By weight is more preferred.
【００１３】0.2重量％未満では粘土に対する減粘性の
効果が充分ではなく、4.0重量％を越えて添加すると硬
化時間の遅延や強度低下をもたらし好ましくない。ま
た、二成分系の組成比が（ａ）成分70〜95重量％と
（ｂ）成分30〜5重量％の範囲であると、硬化材の流動
性、粘土の減粘性が大きく強度低下も少なく、極めて顕
著な効果を発現することを見出した。If the amount is less than 0.2% by weight, the effect of reducing the viscosity on the clay is not sufficient, and if it exceeds 4.0% by weight, the curing time is delayed and the strength is undesirably reduced. Further, when the composition ratio of the two-component system is in the range of 70 to 95% by weight of the component (a) and 30 to 5% by weight of the component (b), the fluidity of the hardening material, the viscosity reduction of the clay, and the strength decrease are small. And a very remarkable effect.
【００１４】本発明の添加剤はセメント系硬化材に添加
するものであり、セメント類としては、普通のポルトラ
ンドセメントの他、高炉セメント、フライアッシュセメ
ント、早強セメント等のセメント類が対象となる。ま
た、セメントの他に各種の混和材、例えばフライアッシ
ュ、シリカヒューム、高炉スラグ、膨張材等を含む混和
材も本発明の範疇であり、限定されるものではない。更
に、本発明の添加剤は、他の公知の添加剤、例えば減水
剤、ＡＥ剤、ＡＥ減水剤、起泡剤、保水剤、増粘剤、高
分子エマルジョン、水溶性高分子等との併用も可能であ
る。The additive of the present invention is to be added to a cement-based hardening material. As the cement, not only ordinary Portland cement but also cements such as blast furnace cement, fly ash cement, and early-strength cement can be used. . Further, in addition to cement, various admixtures, for example, admixtures containing fly ash, silica fume, blast furnace slag, expansive materials and the like are also included in the scope of the present invention and are not limited. Further, the additive of the present invention may be used in combination with other known additives such as a water reducing agent, an AE agent, an AE water reducing agent, a foaming agent, a water retention agent, a thickener, a polymer emulsion, and a water-soluble polymer. Is also possible.
【００１５】本発明の添加剤の対象となる超高圧噴流注
入工法は、上記の如く超高圧（吐出圧力200〜700kg/c
m2）でセメント硬化材による切削と地中土砂との置換を
目的に注入するものであるが、本発明の添加剤は水のみ
で切削し、別ノズルで硬化材を注入する方法においても
使用することができる。この場合、本発明の添加剤を
水、あるいは硬化材、もしくは水と硬化材の両方に添加
する、いずれの方法でも使用することができる。また、
添加剤のみを別経路で注入する方法においても同様であ
る。The ultra-high pressure jet injection method to which the additive of the present invention is applied is, as described above, an ultra-high pressure (discharge pressure of 200 to 700 kg / c).
m 2) but is intended to inject the replacement of the cutting and ground soil by a cement hardener in purpose, the additives of the present invention is cut only with water, also used in a method of injecting a hardening material in a different nozzle can do. In this case, any method of adding the additive of the present invention to water, a hardening material, or both water and a hardening material can be used. Also,
The same applies to a method of injecting only an additive by another route.
【００１６】[0016]
【実施例】以下、実施例により本発明を具体的に説明す
るが、本発明はこれらの実施例に限定されるものではな
い。EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples.
【００１７】下記に示す配合組成で硬化材と粘土物質を
調製し、硬化材に本発明の添加剤および比較添加剤を加
えて流動性を測定した。さらに、添加剤を含む硬化材を
粘土物質に加えて粘度と圧縮強度を測定した。圧縮強度
は粘土物質と硬化材の混合された土中状態の強度を測定
し、本実施例では硬化材と粘土物質の比率を１対２重量
比に設定して実施した。 硬化材調製組成 粘土調製組成 ポルトランドセメント：100重量部 蛙目粘土： 240重量部 水 ： 80重量部 水 ： 120重量部 添加剤 ： 0.2〜4.0重量部 測定は下記に示す方法で実施した。 ・硬化材の流動性： 土木学会制定試験法「プレパック
ドコンクリートの注入モルタル流動性試験」に基づき、
Ｊロート滴下時間（秒）で測定した。 ・硬化材と粘土物質を混合した粘度： Ｂ型粘度計を用
い、cpsで求めた。 ・圧縮強度： 直径５cm、高さ10cmの円筒状供試体を作
製し、28日後の強度をJIS-A1108法にて測定した。A hardening material and a clay material were prepared according to the following composition, and an additive of the present invention and a comparative additive were added to the hardening material, and the fluidity was measured. In addition, a hardener containing additives was added to the clay material and viscosity and compressive strength were measured. The compressive strength was measured by measuring the strength in a soil state in which a clay material and a hardening material were mixed, and in this embodiment, the ratio of the hardening material to the clay material was set at a 1: 2 weight ratio. Hardening material preparation composition Clay preparation composition Portland cement: 100 parts by weight Frog eye clay: 240 parts by weight Water: 80 parts by weight Water: 120 parts by weight Additive: 0.2 to 4.0 parts by weight The measurement was carried out by the following method.・ Fluidity of hardened material: Based on the Japan Society of Civil Engineers test method “Fluidity test of injected mortar for prepacked concrete”
It measured by J funnel dripping time (second). -Viscosity of a mixture of a hardening material and a clay material: Determined by cps using a B-type viscometer. Compressive strength: A cylindrical specimen having a diameter of 5 cm and a height of 10 cm was prepared, and the strength after 28 days was measured by the JIS-A1108 method.
【００１８】実施例での添加剤の配合比と添加量及び評
価結果を表１に示す。表１での添加剤記号内容を下記に
示す。 ＮＳ（１）：ナフタレンスルホン酸ホルムアルデヒド縮
合物の水溶性塩（花王（株）社製商品名マイテイ150） ＮＳ（２）：ナフタレンスルホン酸ホルムアルデヒド縮
合物の水溶性塩（山陽国策パルプ（株）社製商品名サン
フローＰＳ） タンニン酸：富士化学工業（株）社製商品名タンニン酸
ＡTable 1 shows the compounding ratios and the amounts of additives in the examples and the evaluation results. The content of the additive symbol in Table 1 is shown below. NS (1): Water-soluble salt of a naphthalenesulfonic acid formaldehyde condensate (Mayty 150 manufactured by Kao Corporation) NS (2): Water-soluble salt of a naphthalenesulfonic acid formaldehyde condensate (Sanyo Kokusaku Pulp Co., Ltd.) Product name: Sunflow PS) Tannic acid: Product name: Tannic acid A, manufactured by Fuji Chemical Industry Co., Ltd.
【００１９】[0019]
【表１】 [Table 1]
【００２０】表１の結果より、下記に示すように本発明
の添加剤は粘土物質の粘度低下が著しく、他の性能も満
足していることが判る。 ・硬化材の流動性 ： 18秒以下 ・硬化材＋粘土の粘度 ： 5000cps 以下 ・圧縮強度 ： 30kg/cm2以上From the results shown in Table 1, it can be seen that the additive of the present invention significantly reduces the viscosity of the clay material and satisfies other properties as shown below.・ Fluidity of hardening material: 18 seconds or less ・ Viscosity of hardening material + clay: 5000cps or less ・ Compressive strength: 30kg / cm 2 or more
【００２１】[0021]
【発明の効果】本発明の添加剤はセメント系硬化材に流
動性を賦与させ、粘土質に対する減粘効果を向上せしめ
るので、超高圧噴流注入工法用添加剤としてセメント系
硬化材の注入効果による地盤改良工法の発展に寄与しう
るものである。The additive of the present invention imparts fluidity to the cement-based hardening material and improves the viscosity-reducing effect on the clay. Therefore, the additive of the cement-based hardening material is used as an additive for the ultra-high pressure jet injection method. It can contribute to the development of the ground improvement method.
Claims (1)
（ａ）成分と（ｂ）成分の割合が重量比で（ａ）：
（ｂ）＝70〜95：30〜５であることを特徴とする超高圧
噴流注入工法用セメント添加剤。 （ａ）成分：ナフタレンスルホン酸ホルムアルデヒド縮
合物の水溶性塩 （ｂ）成分：タンニン酸1. A Ri Do two components following (a) and (b),
The ratio of the component (a) to the component (b) is expressed by weight ratio of (a):
(B) = 70~95: ultra-high pressure jet grouting cement additives, wherein 30-5 der Rukoto. (A) component: water-soluble salt of a naphthalenesulfonic acid formaldehyde condensate (b) component: tannic acid
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12098292A JP3190109B2 (en) | 1992-05-14 | 1992-05-14 | Cement additive for ultra high pressure jet injection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12098292A JP3190109B2 (en) | 1992-05-14 | 1992-05-14 | Cement additive for ultra high pressure jet injection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05319883A JPH05319883A (en) | 1993-12-03 |
| JP3190109B2 true JP3190109B2 (en) | 2001-07-23 |
Family
ID=14799857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12098292A Expired - Fee Related JP3190109B2 (en) | 1992-05-14 | 1992-05-14 | Cement additive for ultra high pressure jet injection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3190109B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7098582B2 (en) * | 2018-08-08 | 2022-07-11 | 花王株式会社 | Additives for compositions containing inorganic particles |
| CN118184186B (en) * | 2024-03-15 | 2024-09-20 | 西藏高争建材股份有限公司 | Low-alkali high-strength impervious cement and preparation method thereof |
-
1992
- 1992-05-14 JP JP12098292A patent/JP3190109B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05319883A (en) | 1993-12-03 |
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