JP2004268480A - Addition apparatus for adding water-soluble cellulosic polymer into cement composition of agitator vehicle and its addition method - Google Patents
Addition apparatus for adding water-soluble cellulosic polymer into cement composition of agitator vehicle and its addition method Download PDFInfo
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、アジテータ車のセメント組成物にセルロース系水溶性高分子を添加する添加装置およびその添加方法に関する。
【０００２】
【従来の技術】
アジテータ車は生コン工場で、積み荷であるレディミクストコンクリート（以下生コン）やモルタルなどを回転式ドラム（以下ドラム）内に積み込み、ドラムを攪拌作動させることによって積み荷の流動性および均質性を確保しながら指定された場所に搬送する。建設現場に到着後、アジテータ車は指示された場所においてドラム回転方向を逆転させ、積み荷である生コンやモルタルの荷卸し作業を行う。
【０００３】
水中打設コンクリートの不分離性混和剤として、セルロース誘導体等のセルロース系水溶性高分子が用いられている。かかる添加剤は、微粉末の懸濁液であり、その添加は、現場においてアジテータ車内のセメント組成物に添加され攪拌混合されるが、セメント組成物中のアルカリと反応し、均一に混ざりにくく、玉になり易かった。玉の発生は、そのまま用いた場合に品質の低下の原因となるため、使用の際には、メッシュを用いたふるいにかけ、玉を取り除く必要があった。このような現象は、セメント組成物のうち特に、モルタルの場合に顕著であり、製品のクレームの原因ともなっていた。
【０００４】
かかる添加剤の添加装置として、アジテータ車一台に対し用いる簡易型の態様と、セメント組成物が大量に必要な場合に、一度に数台のアジテータ車に添加するアジテータ車の外側に足場を組むやぐらのような形状を有する大量生産型の態様とがある。簡易型の添加装置の場合、従来は例えばパイプに柔軟なホースをつないだ形状をしたものが主であり、ホッパ内ではかかる添加剤がホースによってホッパ内の側面にあたって注入されており、セメント組成物に直接噴射されないため、添加と同時にホッパ側面において玉となりやすく玉の発生の大きな原因ともなっていた。
また、ホースは、Ｌ字型、コの字型または単なる棒状のパイプにつながれたもの等があるが、かかる形状ではホッパ上部において安定せず、作業員が固定、監視していなければならなかった。
【０００５】
【発明が解決しようとする課題】
本発明の課題は、従来の問題点を解決し、アジテータ車のセメント組成物にセルロース系水溶性高分子を添加する場合に、玉が発生することなく均一なセメント組成物を生成する添加装置およびその添加方法を提供することにある。
【０００６】
【課題を解決するための手段】
本発明者は、上記課題を解決すべく鋭意研究を重ねた結果、セルロース系水溶性高分子をシャワーノズルを用いて、アジテータドラム内の中心近傍のセメント組成物に直接噴射できるよう添加することにより、上記課題を解決することを見出し本発明を完成するに至った。
【０００７】
すなわち、本発明は、セルロース系水溶性高分子をアジテータ車のアジテータドラム内にあるセメント組成物に添加するノズルと該ノズルが結合されるパイプおよび／またはホースとを有する添加装置であって、前記ノズルがシャワーノズルである、前記添加装置に関する。
また、本発明は、セルロース系水溶性高分子をアジテータドラム内のセメント組成物の中心近傍に直接噴射できる形状を有する、前記添加装置に関する。
【０００８】
さらに、本発明は、パイプが屈曲部を有し、該屈曲部において枝分かれする構造を有する、前記添加装置に関する。
また、本発明は、直接噴射できる形状が、アジテータ車の外側に足場を組むことによって形成されている、前記添加装置に関する。
さらに、本発明は、セルロース系水溶性高分子をアジテータ車のアジテータドラム内にあるセメント組成物に添加する方法であって、該セルロース系水溶性高分子をアジテータドラム内のセメント組成物の中心近傍にシャワー状に直接噴射する、前記添加方法に関する。
【０００９】
本発明の添加装置によれば、シャワーノズルを用いて添加するため、従来の直接ストレートに添加する場合と異なり、セメント組成物に対し、より広範囲に分散させて混合することができ、玉になりにくく均一で品質の良好なセメント組成物を生成することができる。従って、従来行っていた生成されたセメント組成物をふるいにかける必要もなく、また短時間で均一な混合が可能となることから、攪拌時間を短縮することができ、作業の手間を大幅に削減することが可能となる。
本発明の添加装置は、かかる添加剤をセメント組成物の中心近傍に直接あたるよう噴射される形状を有することにより、例えば従来のホッパ内で柔軟なホースを用いた場合と異なり、ホッパ内の側面に水溶性高分子があたって添加されることがないため、玉になりにくく、均一なセメント組成物を生成することができる。
【００１０】
【発明の実施の形態】
以下に本発明の実施態様を図を例として用いて説明するが、本発明は図の態様に限定されるものではない。
【００１１】
本発明に用いられるセルロース系水溶性高分子は、主に水中コンクリート打設用の不分離性混和剤としてまた、高流動コンクリートに用いられるが、具体的には、メチルセルロース、エチルセルロースなどのアルキルセルロース；ヒドロキシエチルセルロース、ヒドロキシプロピルセルロースなどのヒドロキシアルキルセルロース；ヒドロキシエチルメチルセルロース、ヒドロキシプロピルメチルセルロース、ヒドロキシエチルエチルセルロースなどのヒドロキシアルキルアルキルセルロースが挙げられるが、これらのうちとくに好ましいのはヒドロキシアルキルセルロースとヒドロキシアルキルアルキルセルロースである。
さらに、本発明の添加装置を用いて、セルロース系水溶性高分子と同時にまたは前後して、メラミンスルホン酸ホルマリン縮合物、ポリカルボン酸系の流動化剤等の不分離性混和剤助剤を添加してもよい。
【００１２】
本発明の添加装置のシャワーノズルは、かかる添加剤をシャワー状に添加するのであればいずれの形状であってもよく、用いるアジテータ車によって任意に選択される。
例えば、ノズルの噴射口に角度を設けて、噴射の方角を調整し、かかる添加剤をより広範囲に分散するようにしたり、また穴の大きさを小さくして、噴射圧を大きくすることもできる。
また、本発明の添加装置は、シャワー状に添加するシャワーノズル部を有すればよく、シャワーノズル部と装置全体が一体化したものであっても、シャワーノズル部を取り外すことのできる組み立て式であってもよい。
シャワーノズルの材質は、塩化ビニル、ステンレススチール、鋼等がある。
【００１３】
本発明の添加装置は、アジテータ車一台に対し用いる簡易型の態様と、セメント組成物が大量に必要な場合に、一度に数台のアジテータ車に添加することができる、アジテータ車の外側に足場を組む大量生産型の態様とのいずれにも用いることができる。
また、本発明の添加装置は、スイッチ付電動水中ポンプ等に連結して用いる。
【００１４】
本発明の添加装置は、セルロース系水溶性高分子をアジテータドラム内の中心近傍のセメント組成物に対し直接あたるように噴射できる形状を有するものが、上記添加剤が混合された際に玉になりにくく、均一に混合されるため、好ましい。
かかる形状は、図２に示すアジテータ車一台に対し用いる簡易型の場合には、ホッパ内部にホースを用いると、セルロース系水溶性高分子がホッパ側面にあたり添加されるため、玉の原因となり好ましくなく、ホッパ内部はパイプを用いてかかる形状を形成するのが好ましい。ホッパ内におけるパイプの形状は、シャワーノズルがドラム側面およびドラム内の羽根にあたらず、水溶性高分子が、セメント組成物に直接あたるように噴射できる形状であれば、いずれの形状であってもよい。例えば、図２に示すようにホッパ内部において、１または２以上の屈曲部を有することによってかかる形状を実現することも、また屈曲させることなく、カーブを設ける曲線構造によって実現してもよく、セメント組成物の量、ドラム内の形状等によって任意に決めることができる。
パイプの材質は、塩化ビニル、ステンレススチール、鋼等がある。
【００１５】
一方、一度に数台のアジテータ車に添加する大量生産型の場合には、足場自体を、アジテータドラム内の中心近傍のセメント組成物に直接噴射できるように組むことによってかかる形状を実現することができる。かかる場合には、足場自体がセメント組成物に直接あたるよう組むものであるため、シャワーノズルは、パイプによってホッパ内部に結合される必要はなく、ホッパの上に直接噴射できるよう設けられた足場のパイプからホースを下げるような構造によって実現することが可能である。
【００１６】
また、簡易型の場合には、図２に示すようにホッパ上部において屈曲部を有するが、該屈曲部において枝分かれする構造を有するものが、かかる装置をホッパ上部に引っ掛けることで安定に固定することが可能となり、好ましい。枝分かれ構造により、従来の単なるＬ字型、コの字型、棒状のパイプとホースを結合させたものと比較して、安定なものとなることから添加時に作業員がパイプを固定、監視する必要がなくなり、手間を削減することができる。
【００１７】
【本発明の効果】
本発明の添加装置によれば、水中打設コンクリート等の不分離性混和剤として用いられるセルロース系水溶性高分子をセメント組成物に対し玉が発生することなく均一に混合できることにより、品質の良好な製品を生成することができ、さらに作業の手間および攪拌時間を大幅に削減することができる。
【図面の簡単な説明】
【図１】本発明の添加装置に用いられるシャワーノズル部を示す図である。
【図２】本発明の添加装置の一態様を示す図である。
【符号の説明】
１ シャワーノズル部
２ ホッパ
３ アジテータドラム内筒
４ 添加装置
５ シャワーノズル部[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an adding apparatus and a method for adding a cellulosic water-soluble polymer to a cement composition of an agitator wheel.
[0002]
[Prior art]
Agitator trucks load ready-mixed concrete (hereafter, ready-mixed concrete) or mortar, etc., in a rotary drum (hereafter, drum) at a ready-mixed concrete plant and stir the drum to ensure the fluidity and uniformity of the load. Transport to specified location. After arriving at the construction site, the agitator vehicle reverses the direction of rotation of the drum at the designated location, and unloads the ready-mixed concrete and mortar that is the cargo.
[0003]
BACKGROUND ART Cellulose-based water-soluble polymers such as cellulose derivatives have been used as inseparable admixtures for underwater cast concrete. Such an additive is a suspension of fine powder, the addition of which is added to the cement composition in the agitator vehicle and mixed with stirring at the site, but reacts with the alkali in the cement composition and hardly mixes uniformly, It was easy to bead. Since the generation of balls causes deterioration in quality when used as they are, it was necessary to remove the balls by sieving using a mesh before use. Such a phenomenon is particularly remarkable in the case of mortar among cement compositions, and has been a cause of product complaints.
[0004]
As a device for adding such an additive, a simple mode used for one agitator wheel, and when a large amount of cement composition is required, a scaffold is assembled outside the agitator wheel to be added to several agitator wheels at a time. There is a mode of mass production type having a shape like a tower. In the case of a simple addition device, conventionally, for example, a shape in which a flexible hose is connected to a pipe is mainly used.In a hopper, such an additive is injected into a side surface of the hopper by a hose, and a cement composition is used. Since it is not directly injected into the hopper, it tends to bead on the side surface of the hopper at the same time as the addition, which is a major cause of the occurrence of the ball.
Also, there are hoses connected to an L-shape, U-shape, or a simple rod-shaped pipe, but such a shape was not stable at the upper part of the hopper and had to be fixed and monitored by an operator. .
[0005]
[Problems to be solved by the invention]
The object of the present invention is to solve the conventional problems, when adding a cellulosic water-soluble polymer to the cement composition of the agitator wheel, an addition device that generates a uniform cement composition without the generation of balls and It is an object of the present invention to provide a method of adding the same.
[0006]
[Means for Solving the Problems]
The present inventors have conducted intensive studies to solve the above problems, and as a result, by using a shower nozzle, by adding a cellulose-based water-soluble polymer to a cement composition near the center of an agitator drum so that it can be directly sprayed. The inventors have found that the above-mentioned problems can be solved, and have completed the present invention.
[0007]
That is, the present invention is an addition apparatus having a nozzle for adding a cellulose-based water-soluble polymer to a cement composition in an agitator drum of an agitator wheel, and a pipe and / or a hose to which the nozzle is connected, The present invention relates to the addition device, wherein the nozzle is a shower nozzle.
Further, the present invention relates to the above-mentioned addition device, which has a shape capable of directly injecting the cellulose-based water-soluble polymer into the vicinity of the center of the cement composition in the agitator drum.
[0008]
Further, the present invention relates to the addition device, wherein the pipe has a bent portion and has a structure branched at the bent portion.
The present invention also relates to the above-mentioned addition device, wherein the shape that can be directly injected is formed by assembling a scaffold outside the agitator wheel.
Further, the present invention is a method for adding a cellulose-based water-soluble polymer to a cement composition in an agitator drum of an agitator wheel, wherein the cellulose-based water-soluble polymer is added near the center of the cement composition in the agitator drum. To the above-mentioned addition method, which is directly sprayed into a shower.
[0009]
According to the addition device of the present invention, since the addition using a shower nozzle, unlike the conventional direct addition to the straight, it can be dispersed and mixed with the cement composition over a wider range, resulting in beads. A hard and uniform cement composition of good quality can be produced. Therefore, there is no need to sieve the produced cement composition, which has been conventionally performed, and uniform mixing can be performed in a short time, so that the stirring time can be reduced, and the labor of the operation is greatly reduced. It is possible to do.
The addition device of the present invention has a shape in which such an additive is sprayed so as to directly hit the vicinity of the center of the cement composition, for example, unlike the case where a flexible hose is used in a conventional hopper, a side surface in the hopper. Since the water-soluble polymer is not added to the water, it is hard to bead and a uniform cement composition can be produced.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments in the drawings.
[0011]
The cellulose-based water-soluble polymer used in the present invention is mainly used as a non-separable admixture for placing concrete in water and also in high-fluidity concrete, and specifically, alkyl cellulose such as methyl cellulose and ethyl cellulose; Hydroxyalkylcellulose such as hydroxyethylcellulose and hydroxypropylcellulose; hydroxyalkylalkylcellulose such as hydroxyethylmethylcellulose, hydroxypropylmethylcellulose and hydroxyethylethylcellulose. Of these, hydroxyalkylcellulose and hydroxyalkylalkylcellulose are particularly preferred. is there.
Further, using the addition device of the present invention, at the same time as or before and after the cellulose-based water-soluble polymer, add a non-separable admixture auxiliary agent such as a melamine sulfonic acid formalin condensate, a polycarboxylic acid-based fluidizing agent May be.
[0012]
The shower nozzle of the addition device of the present invention may have any shape as long as the additive is added in a shower shape, and is arbitrarily selected depending on the agitator wheel used.
For example, it is also possible to increase the injection pressure by providing an angle to the injection port of the nozzle, adjusting the direction of injection, and dispersing such an additive more widely, or reducing the size of the hole. .
Further, the addition device of the present invention may have a shower nozzle portion for adding in a shower shape, and even if the shower nozzle portion and the entire device are integrated, the assembling type can remove the shower nozzle portion. There may be.
The material of the shower nozzle includes vinyl chloride, stainless steel, steel and the like.
[0013]
The addition device of the present invention is a simple mode used for one agitator wheel, and when a large amount of cement composition is required, it can be added to several agitator wheels at a time. It can be used in any of the mass-produced forms of scaffolding.
The addition device of the present invention is used by being connected to an electric submersible pump with a switch.
[0014]
The addition device of the present invention has a shape capable of directly spraying the cellulosic water-soluble polymer against the cement composition near the center in the agitator drum, but becomes a ball when the additives are mixed. It is preferable because it is difficult to mix and uniform.
In the case of a simple type used for one agitator vehicle shown in FIG. 2, when a hose is used inside the hopper, the water-soluble cellulose-based polymer is added to the side surface of the hopper, which causes a ball, which is preferable. Instead, it is preferable to form such a shape using a pipe inside the hopper. The shape of the pipe in the hopper may be any shape as long as the shower nozzle does not hit the blade side surface and the blades in the drum, and the water-soluble polymer can be sprayed so as to directly hit the cement composition. Good. For example, as shown in FIG. 2, such a shape may be realized by having one or more bent portions inside the hopper, or may be realized by a curved structure in which a curve is provided without bending. It can be arbitrarily determined according to the amount of the composition, the shape in the drum, and the like.
The material of the pipe includes vinyl chloride, stainless steel, steel and the like.
[0015]
On the other hand, in the case of a mass production type that is added to several agitator vehicles at a time, it is possible to realize such a shape by assembling the scaffold itself so that it can be directly injected into the cement composition near the center in the agitator drum. it can. In such a case, since the scaffold itself is assembled so as to directly hit the cement composition, the shower nozzle does not need to be connected to the inside of the hopper by a pipe. This can be realized by a structure that lowers the hose.
[0016]
In addition, in the case of the simple type, as shown in FIG. 2, the hopper has a bent portion at the upper portion, but a device having a structure branched at the bent portion is stably fixed by hooking the device on the upper portion of the hopper. Becomes possible, which is preferable. The branching structure is more stable than conventional L-shaped, U-shaped, rod-shaped pipes and hoses combined, so workers need to fix and monitor the pipes during addition. Is eliminated, and labor can be reduced.
[0017]
[Effects of the present invention]
According to the addition device of the present invention, the cellulosic water-soluble polymer used as an inseparable admixture for underwater cast concrete and the like can be uniformly mixed with the cement composition without generating beads. Product can be produced, and the labor and stirring time of the operation can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a view showing a shower nozzle used in an addition device of the present invention.
FIG. 2 is a diagram showing one embodiment of the addition device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003064404A JP4336126B2 (en) | 2003-03-11 | 2003-03-11 | Additive device for adding cellulosic water-soluble polymer to cement composition of agitator car and method for adding the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003064404A JP4336126B2 (en) | 2003-03-11 | 2003-03-11 | Additive device for adding cellulosic water-soluble polymer to cement composition of agitator car and method for adding the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004268480A true JP2004268480A (en) | 2004-09-30 |
| JP4336126B2 JP4336126B2 (en) | 2009-09-30 |
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| JP2003064404A Expired - Fee Related JP4336126B2 (en) | 2003-03-11 | 2003-03-11 | Additive device for adding cellulosic water-soluble polymer to cement composition of agitator car and method for adding the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020001205A (en) * | 2018-06-26 | 2020-01-09 | 信越化学工業株式会社 | Method for producing mortar composition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020001205A (en) * | 2018-06-26 | 2020-01-09 | 信越化学工業株式会社 | Method for producing mortar composition |
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| JP4336126B2 (en) | 2009-09-30 |
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