JP3206986B2 - Cement additive for ultra high pressure jet injection method - Google Patents
Cement additive for ultra high pressure jet injection methodInfo
- Publication number
- JP3206986B2 JP3206986B2 JP27857692A JP27857692A JP3206986B2 JP 3206986 B2 JP3206986 B2 JP 3206986B2 JP 27857692 A JP27857692 A JP 27857692A JP 27857692 A JP27857692 A JP 27857692A JP 3206986 B2 JP3206986 B2 JP 3206986B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- additive
- high pressure
- pressure jet
- 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 - Lifetime
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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/20—Sulfonated aromatic compounds
- C04B24/22—Condensation or polymerisation products thereof
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
-
- 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
- C04B2103/40—Surface-active agents, dispersants
- C04B2103/408—Dispersants
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (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、その中に菅
（２重ないし３重の菅）を通してセメント系硬化材を、
超高圧（200 〜700kg ／cm2)ジェット噴流体として送
り、回りの土砂を削り取り、土砂を地上に排出しながら
硬化材との置換によって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 of about 15 cm in diameter is drilled from the ground to the depth of the ground, and a cement-based hardening material is passed through a tube (double or triple tube).
Ultra-high pressure (200 to 700 kg / cm 2 ) jet as a jet jet, scraping the surrounding earth and sand, and discharging the earth and sand to the ground, replacing the hardened material to improve the soft ground to build pillars and walls in the ground It is a construction method.
【０００３】この工法には高流動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
の目的の材としてセメント・水比による強度（28日後の
強度＝30kg／cm2)を満足し、流動効果のあるナフタレン
スルホン酸塩ホルマリン縮合物（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。また、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
削した土砂を混合して地上へ排出される必要があり、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。Since this method requires a high-flow cement-based hardening material (hereinafter referred to as a hardening material), a conventional material for this purpose has a strength based on a cement / water ratio (strength after 28 days = 30 kg / cm). Naphthalenesulfonate formalin condensate which satisfies 2 ) and has a flow effect is used as an additive. Also, in this method, a part of the hardening material injected as a jet jet fluid needs to be mixed with cut earth and sand and discharged to the ground. Is done.
【０００４】[0004]
【発明が解決しようとする課題】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にあ
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
にともなう表層部への突起などの現象が生じ問題となっ
ている。However, although the conventional naphthalene-based additive has a large ability to lower the viscosity of the hardening material at the time of injection, its viscosity-reducing effect on clay is small, so that the viscosity of the sludge does not decrease. Is difficult to discharge. As a result, not only does the injection efficiency of the hardening material decrease, but also the hardening material diffuses out of the design in the soil, and a phenomenon such as a projection on the surface layer portion occurs, which is a problem.
【０００５】[0005]
【問題を解決する手段】上記問題点を鑑み、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
併せ持ち、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。[Means for Solving the Problems] In view of the above problems, the present inventors have both the high fluidity of the hardening material and the performance of thinning the clay, and have the standard strength (strength after 28 days = 30 kg / cm 2 or more).
As a result of diligent studies aimed at an additive satisfying the following, the present invention has been completed.
【０００６】即ち、本発明は、(a) セメント分散剤と
(b) ニトロフミン酸及び／又はそのアルカリ金属塩を必
須成分とし、(a) 成分と(b) 成分の割合が (a)：(b) ＝
70〜95：30〜５重量比である超高圧噴流注入工法用セメ
ント添加剤を提供するものである。That is, the present invention relates to (a) a cement dispersant
(b) Nitrohumic acid and / or an alkali metal salt thereof are essential components, and the ratio of the components (a) and (b) is (a) :( b) =
An object of the present invention is to provide a cement additive for an ultra-high pressure jet injection method having a weight ratio of 70 to 95:30 to 5 .
【０００７】本発明の添加剤は、硬化材の高流動性に優
れ、しかもこの硬化材は粘土質の減粘性にも優れた効果
を与えるものである。[0007] The additive of the present invention is excellent in the high fluidity of the hardening material, and the hardening material also has an excellent effect on clay thinning.
【０００８】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に対し分散性を与え、かつセメン
トを分散させた後に、さらに粘度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、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。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 present inventors impart dispersibility to the cement particles and clay particles, and after dispersing the cement, studied an additive that has the effect of further dispersing the viscous substance, and completed the present invention, This shows performance that cannot be obtained with naphthalene-based or general dispersants.
【０００９】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荷電を与え、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
質に対して、吸着速度や吸着形態が一般の分散剤とは異
なっていると推察される。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. On the other hand, it is presumed that the adsorption speed and the adsorption form are different from those of general dispersants.
【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流動性を与え、この時点で粘土に吸
着する成分を残し、粘土物質との接触時点を残成分が吸
着して減粘性を示すもので、本発明の添加剤の二成分が
両物質に対して経時的吸着と分散が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 firstly adsorbs to the cement in the hardening material to give fluidity, and at this point, the component adsorbed on the clay is left. It is presumed that the two components of the additive of the present invention are effectively acting on both substances over time by adsorption and dispersion.
【００１１】本発明において、(a) 成分のセメント分散
剤としては、ナフタレンスルホン酸塩ホルムアルデヒド
縮合物、メラミンスルホン酸塩ホルムアルデヒド縮合
物、ポリカルボン酸もしくはそのエステルもしくはその
塩、ポリスチレンスルホン酸塩からなるセメント分散
剤、フェノール系ホルムアルデヒド縮合物（例えば、フ
ェノールスルホン酸と共縮合可能な他の単量体とのホル
ムアルデヒド共縮合物）からなるセメント分散剤、及び
アニリンスルホン酸系ホルムアルデヒド縮合物（例え
ば、アニリンスルホン酸と共縮合可能な他の単量体との
ホルムアルデヒド共縮合物）を主成分とするセメント分
散剤から選ばれる１種又は２種以上が使用される。In the present invention, the cement dispersant of the component (a) comprises a naphthalene sulfonate formaldehyde condensate, a melamine sulfonate formaldehyde condensate, a polycarboxylic acid or an ester or salt thereof, and a polystyrene sulfonate. A cement dispersant, a cement dispersant comprising a phenol-based formaldehyde condensate (eg, a formaldehyde co-condensate with another monomer capable of co-condensing with phenolsulfonic acid), and an anilinesulfonic acid-based formaldehyde condensate (eg, aniline) One or two or more selected from cement dispersants containing (as a main component) a formaldehyde co-condensate of sulfonic acid and another monomer that can be co-condensed.
【００１２】本発明の (b)成分は、ニトロフミン酸及び
／又はそのアルカリ金属塩であり、公知の方法で製造さ
れる水溶性の物質、例えば、「11691 の化学商品」（19
91年１月23日、化学工業日報社発行）の第1451頁に記載
されているものを用いることができるが、特に限定され
るものではない。The component (b) of the present invention is nitrohumic acid and / or an alkali metal salt thereof, and is a water-soluble substance produced by a known method, for example, "11691 Chemical Product" (19
It is possible to use those described on page 1451 of Jan. 23, 1991, published by The Chemical Daily, but there is no particular limitation.
【００１３】ニトロフミン酸は掘削用デイ水調整剤とし
て使用されることもあるが、その場合に用いられる工法
は、本発明に係る超高圧噴流注入工法とは全く異なるも
のである。本発明のセメント添加剤は、セメント分散剤
にニトロフミン酸を併用することにより、超高圧噴流注
入工法という特殊な工法において、セメントと粘土の双
方を含有する物質に対してセメントと粘土の分散性を共
に向上させるという効果を示すものである。[0013] Nitrohumic acid is sometimes used as a day water conditioner for drilling, but the method used in that case is completely different from the ultrahigh pressure jet injection method according to the present invention. The cement additive of the present invention, by using nitrohumic acid in combination with a cement dispersant, in a special method called ultra-high pressure jet injection method, the dispersibility of cement and clay with respect to a substance containing both cement and clay. This shows the effect of improving both.
【００１４】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。添加量が0.2 重量％未満では粘土に対する減粘
性の効果が十分ではなく、また 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。The amount of the additive of the present invention is from 0.2% by weight to 4.0% by weight in terms of the active ingredient based on the cement in the hardening material.
Is preferably in the range of 0.5% to 2.0% by weight. If the amount is less than 0.2% by weight, the effect of reducing viscosity on the clay is not sufficient, and if it exceeds 4.0% by weight, the curing time is delayed and the strength is reduced, which is not preferable.
【００１５】また、本発明の添加剤において、 (a)成分
と (b)成分の組成比は (a)成分が70〜90重量％、 (b)成
分が30〜５重量％の範囲である。両者の比率がこの範囲
にあると、硬化剤の流動性、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。Further, in the additive of the present invention is the component (a) and (b) the composition ratio of the component (a) component is 70 to 90 wt%, (b) range component is 30 to 5 wt% . When the ratio of the two is within this range, the fluidity of the curing agent and the viscosity of the clay are large, the strength is not greatly reduced, and a very remarkable effect is exhibited.
【００１６】本発明の添加剤は超高圧噴流注入工法用の
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、早強セメント等のセメント類が対
象となる。又、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囲内であり、限定されるもの
ではない。The additive of the present invention is added to a cement-based hardening material for an ultra-high pressure jet injection method. As cements, in addition to ordinary Portland cement, cements such as blast furnace cement, fly ash, and early-strength cement Kind is targeted. 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.
【００１７】さらに、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。Further, the additives of the present invention include other known additives such as water reducing agents, AE agents, AE water reducing agents, foaming agents, water retaining agents, thickeners, polymer emulsions, water-soluble polymers, etc. ,
Can also be used in combination.
【００１８】本発明添加剤の対象となる超高圧噴流注入
工法は、上記のごとく超高圧 (吐出圧力 200〜700 kg／
cm2)でセメント硬化材によって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、別ノズルで硬化剤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を添加
する。何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 which is the object of the additive of the present invention is, as described above, an ultra-high pressure (discharge pressure of 200 to 700 kg /
cm 2) but is intended to inject the purpose of replacement of the cutting and ground soil by a cement hardener in the additives of the present invention is cut only with water, also used in a method of injecting a curing agent in a different nozzle can do. In this case, the additive of the present invention is added with water, a hardening material, or both water and a hardening material. Either method can be used. The same applies to the method of injecting only the additive by another route.
【００１９】[0019]
【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.
【００２０】実施例１ 下記に示す配合組成で硬化材と粘土物質を調製し、本発
明の添加剤及び比較添加剤を加えて硬化材の流動性を測
定した。 (1) 硬化材組成 セメント： 100重量部 水 ： 80重量部 添加剤 ： 0.2〜4.0 重量部（表１参照） (2) 粘土物質組成 蛙目粘土： 240重量部 水 ： 120重量部 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。
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。 ・硬化材と粘土物質の混合物の粘度：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成
し、28日後の強度を JIS−A1108 法にて測定した。 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。Example 1 A hardener and a clay material were prepared according to the following composition, and the flowability of the hardener was measured by adding the additive of the present invention and a comparative additive. (1) Hardening material composition Cement: 100 parts by weight Water: 80 parts by weight Additive: 0.2 to 4.0 parts by weight (see Table 1) (2) Clay material composition Frogme clay: 240 parts by weight Water: 120 parts by weight The hardener containing the agent was added to the clay material and the 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.
The measurement was performed by the following method.・ Fluidity of hardened material: J
It measured by the funnel dripping time (second).・ Viscosity of the mixture of the hardener and the clay material: It was 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. Table 1 shows the compounding ratios and the amounts of the additives and the evaluation results in Examples.
Shown in
【００２１】また、表１中の添加剤の記号を下記に示
す。 NS：ナフタレンスルホン酸塩ホルマリン縮合物（花王
（株）製、商品名マイティ150) MS：メラミンスルホン酸塩ホルマリン縮合物（花王(株)
製、商品名マイティ150V 2) AS：アニリンスルホン酸塩フェノールホルマリン縮合物
（藤沢薬品（株）製、商品名パリックFP−200S) RS：ポリエチレンポリアクリル酸エーテル（竹本油脂
（株）製、商品名チューポールHP−８） PS：ポリエチレンスルホン酸塩（ライオン油脂（株）
製、商品名グラリオン S−１００）The symbols of the additives in Table 1 are shown below. NS: Naphthalene sulfonate formalin condensate (manufactured by Kao Corporation, trade name Mighty 150) MS: Melamine sulfonate formalin condensate (Kao Corp.)
Manufactured by Mighty 150V 2) AS: aniline sulfonate phenol formalin condensate (manufactured by Fujisawa Pharmaceutical Co., Ltd., trade name: PALIC FP-200S) RS: polyethylene polyacrylate ether (manufactured by Takemoto Yushi Co., Ltd.), trade name Tupole HP-8) PS: polyethylene sulfonate (Lion Oil & Fat Co., Ltd.)
Made, brand name GRALION S-100)
【００２２】[0022]
【表１】 [Table 1]
【００２３】＊セメントに対する重量％ （結果）表１の結果より、本発明の添加剤は、硬化材、
硬化材と粘土物質の混合物に対する粘度低下効果が著し
く、他の性能も満足しており、下記に示す実用上の一般
的な目安を全て満足するものである。 ・硬化剤の流動性 ；18秒以下 ・硬化剤＋粘土の粘度；5000 cPs以下 ・圧縮強度 ；30kg／cm2 以上* Weight% based on cement (Results) From the results shown in Table 1, the additive of the present invention was obtained by
The effect of lowering the viscosity of the mixture of the hardener and the clay material is remarkable, and the other properties are also satisfied.・ Fluidity of hardener: 18 seconds or less ・ Viscosity of hardener + clay: 5000 cPs or less ・ Compressive strength: 30 kg / cm 2 or more
【００２４】[0024]
【発明の効果】本発明の添加剤はセメント系硬化剤に流
動性を付与し、且つ粘土質に対する減粘効果を向上せし
めるので、超高圧噴流注入用添加剤としてセメント系硬
化剤の注入効果による地盤改良工法の発展に寄与し得る
ものである。The additive of the present invention imparts fluidity to the cement-based hardening agent and improves the viscosity-reducing effect on the clay. Therefore, the additive of the cement-based hardening agent is used as an additive for super high pressure jet injection. It can contribute to the development of the ground improvement method.
Claims (2)
酸及び／又はそのアルカリ金属塩を必須成分とし、(a)
成分と(b) 成分の割合が (a)：(b) ＝70〜95：30〜５重
量比である超高圧噴流注入工法用セメント添加剤。1. A (a) and the cement dispersing agent and (b) nitrohumic acid and / or an essential component an alkali metal salt thereof, (a)
The ratio of the component and the component (b) is (a) :( b) = 70 to 95:30 to 5 times
A cement additive for the ultra high pressure jet injection method, which is a quantitative ratio .
ホン酸塩ホルムアルデヒド縮合物、メラミンスルホン酸
塩ホルマリン縮合物、ポリカルボン酸もしくはそのエス
テルもしくはその塩、ポリスチレンスルホン酸塩、フェ
ノール系ホルムアルデヒド縮合物、及びアニリンスルホ
ン酸系ホルムアルデヒド縮合物を主成分とするセメント
分散剤から選ばれる１種又は２種以上である請求項１記
載の超高圧噴流注入工法用セメント添加剤。(2) a cement dispersant comprising a naphthalene sulfonate formaldehyde condensate, a melamine sulfonate formalin condensate, a polycarboxylic acid or an ester or salt thereof, a polystyrene sulfonate, a phenolic formaldehyde condensate; The cement additive for an ultra-high pressure jet injection method according to claim 1, wherein the cement additive is at least one member selected from the group consisting of a cement dispersant and a anilinesulfonic acid-based formaldehyde condensate as a main component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27857692A JP3206986B2 (en) | 1992-10-16 | 1992-10-16 | Cement additive for ultra high pressure jet injection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27857692A JP3206986B2 (en) | 1992-10-16 | 1992-10-16 | Cement additive for ultra high pressure jet injection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06127993A JPH06127993A (en) | 1994-05-10 |
| JP3206986B2 true JP3206986B2 (en) | 2001-09-10 |
Family
ID=17599196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27857692A Expired - Lifetime JP3206986B2 (en) | 1992-10-16 | 1992-10-16 | Cement additive for ultra high pressure jet injection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3206986B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8241217B2 (en) | 1995-06-29 | 2012-08-14 | Teratech Corporation | Portable ultrasound imaging data |
| US8469893B2 (en) | 1995-06-29 | 2013-06-25 | Teratech Corp. | Portable ultrasound imaging system |
| US8628474B2 (en) | 1995-06-29 | 2014-01-14 | Teratech Corporation | Portable ultrasound imaging system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111377643B (en) * | 2018-12-31 | 2021-09-28 | 江苏苏博特新材料股份有限公司 | High-adaptability viscosity-reduction type polycarboxylate superplasticizer and preparation method and application thereof |
-
1992
- 1992-10-16 JP JP27857692A patent/JP3206986B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8241217B2 (en) | 1995-06-29 | 2012-08-14 | Teratech Corporation | Portable ultrasound imaging data |
| US8469893B2 (en) | 1995-06-29 | 2013-06-25 | Teratech Corp. | Portable ultrasound imaging system |
| US8628474B2 (en) | 1995-06-29 | 2014-01-14 | Teratech Corporation | Portable ultrasound imaging system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06127993A (en) | 1994-05-10 |
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