JP2000087023A - Dispersing agent for excavation slurry and excavation slurry using the same - Google Patents
Dispersing agent for excavation slurry and excavation slurry using the sameInfo
- Publication number
- JP2000087023A JP2000087023A JP25663098A JP25663098A JP2000087023A JP 2000087023 A JP2000087023 A JP 2000087023A JP 25663098 A JP25663098 A JP 25663098A JP 25663098 A JP25663098 A JP 25663098A JP 2000087023 A JP2000087023 A JP 2000087023A
- Authority
- JP
- Japan
- Prior art keywords
- mud
- muddy water
- slurry
- excavation
- dispersant
- 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.)
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Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、泥水シールド工
法、地中連続壁工法といった泥水工法で使用される掘削
泥水用分散剤及びそれを用いた掘削用泥水に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dispersant for drilling mud used in a mud construction method such as a mud shield construction method and an underground continuous wall method, and a drilling mud using the same.
【０００２】[0002]
【従来の技術】泥水シールド工法、地中連続壁工法とい
った泥水工法では、泥水の造壁性を生かして切羽や溝壁
を安定させるとともに、掘削ずりを泥水とともにスラリ
ー輸送し、スラリー輸送された泥水から掘削ずりを分離
除去した後、再度、切羽や溝壁側に戻して循環使用され
る。2. Description of the Related Art In a muddy water method such as a muddy water shield method and an underground continuous wall method, a face and a groove wall are stabilized by making use of the wall forming property of the muddy water, and the excavated waste is transported in slurry with the muddy water. After the excavated waste is separated and removed from the surface, it is returned to the face and the groove wall side again and used for circulation.
【０００３】このように、泥水工法で使用される掘削用
泥水には、切羽や溝壁を安定させるべく良好な造壁性を
有していることが基本的に要求されるとともに、スラリ
ー輸送等の関係上、逸液が防止される範囲内で低粘性が
保持されることが望ましい。また、地中連続壁工法で
は、耐セメント性を有していることも要求される。[0003] As described above, the drilling mud used in the muddy water method is basically required to have good wall-forming properties to stabilize the face and the groove wall, and is required to be used for slurry transportation and the like. In view of the above, it is desirable that the low viscosity is maintained within a range in which liquid leakage is prevented. In addition, the underground diaphragm wall method is required to have cement resistance.
【０００４】かかる機能を満たすべく、従来、ベントナ
イト、ＣＭＣ、分散剤、ポリマー剤等を作泥材料とした
掘削用泥水が広く使用されてきた。このような掘削用泥
水は、ベントナイト等が泥水中で良好に分散するため、
低粘性を維持しながら切羽や溝壁に良好なマッドケーキ
を形成することが可能であり、かかるマッドケーキによ
って止水性ひいては切羽や溝壁の安定を確保することが
可能となる。In order to satisfy such a function, drilling mud using a bentonite, CMC, dispersant, polymer agent or the like as a mud making material has been widely used. Such mud for drilling, because bentonite and the like are well dispersed in the muddy water,
It is possible to form a good mud cake on the face and the groove wall while maintaining low viscosity, and it is possible to secure the waterproofness and, consequently, the stability of the face and the groove wall by the mud cake.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな掘削用泥水では、作泥材料として本来的にベントナ
イトやＣＭＣあるいはポリマー剤が必須となるため、工
事規模が大きくなると大量の泥水が必要となり、作泥材
料もそれに見合った量だけ調達しなければならないこと
はもちろんのこと、工事規模に応じた作泥プラントやス
トックヤードを現場に設置しなければならないという問
題を生じていた。However, in such a drilling mud, bentonite, CMC or a polymer agent is essentially required as a mud making material. Therefore, when the construction scale is large, a large amount of mud is required. The mud cultivation material must be procured in an amount corresponding to the amount of the material, and a problem has arisen in that a mud cultivation plant and a stock yard according to the construction scale must be installed at the site.
【０００６】また、地中連続壁工法では、循環使用を繰
り返している間に、コンクリートからのカルシウムイオ
ンがベントナイトや粘土コロイドの分散性を著しく低下
させ、粘性の増加や造壁性の低下を招く。そのため、分
散性が低下したいわゆる劣化泥水に対しては、炭酸ナト
リウムなどを適宜添加することで分散性を回復し、再生
使用が図られるが、添加量が多くなるにつれて逆に塩類
凝集を引き起こすため、劣化泥水を再生使用するにはど
うしても限度があり、いずれは劣化泥水を大量に廃棄処
分しなければならないとともに、上述した作泥材料を使
って新しい泥水を作製し随時補充しなければならないと
いう問題も生じていた。[0006] In the underground continuous wall method, calcium ions from concrete significantly reduce the dispersibility of bentonite and clay colloid during repeated use, resulting in an increase in viscosity and a decrease in wall-forming properties. . Therefore, for so-called degraded mud with reduced dispersibility, dispersibility can be recovered by appropriately adding sodium carbonate or the like, and recycling can be achieved. However, as the amount of addition increases, conversely salt aggregation occurs. However, there is a limit to reusing and using degraded mud, and eventually, a large amount of degraded mud must be disposed of, and new mud must be prepared and replenished as needed using the above-mentioned mud-making materials. Had also occurred.
【０００７】本発明は、上述した事情を考慮してなされ
たもので、ベントナイト、ＣＭＣ、ポリマー剤といった
作泥材料を要することなく、現場に存在する材料だけで
掘削用泥水を作ることが可能な掘削泥水用分散剤及びそ
れを用いた掘削用泥水を提供することを目的とする。[0007] The present invention has been made in view of the above-mentioned circumstances, and it is possible to produce a drilling mud using only existing materials on site without the need for mud-making materials such as bentonite, CMC, and a polymer agent. An object of the present invention is to provide a dispersant for drilling mud and a drilling mud using the same.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本発明に係る掘削泥水用分散剤は請求項１に記載し
たように、ポリアクリル酸塩、ポリメタクリル酸塩若し
くはそれらの共重合体からなり、重量平均分子量Ｍｗを
１００００乃至１４０００としたものである。In order to achieve the above object, a dispersant for drilling mud according to the present invention is a polyacrylate, a polymethacrylate or a copolymer thereof, as described in claim 1. And having a weight average molecular weight Mw of 10,000 to 14,000.
【０００９】また、本発明に係る掘削泥水用分散剤は、
前記ポリアクリル酸塩、ポリメタクリル酸塩若しくはそ
れらの共重合体を一価塩としたものである。Further, the dispersant for drilling mud according to the present invention comprises:
The polyacrylate, polymethacrylate or a copolymer thereof is a monovalent salt.
【００１０】また、本発明に係る掘削用泥水は請求項３
に記載したように、ポリアクリル酸塩、ポリメタクリル
酸塩若しくはそれらの共重合体であって重量平均分子量
Ｍｗが１００００乃至１４０００である掘削泥水用分散
剤と、細粒分からなる土とを含むものである。[0010] The drilling mud according to the present invention is claimed in claim 3.
As described in above, a polyacrylate, a polymethacrylate or a copolymer thereof, which includes a dispersant for drilling mud having a weight average molecular weight Mw of 10,000 to 14,000, and a soil composed of fine particles. .
【００１１】また、本発明に係る掘削用泥水は、前記細
粒分を１０μｍ以下としたものである。In the muddy water for excavation according to the present invention, the fine particles are set to 10 μm or less.
【００１２】本発明に係る掘削泥水用分散剤及びそれを
用いた掘削用泥水においては、本発明の掘削泥水用分散
剤が土の細粒分を著しく分散させ、分散された土の細粒
分は、従来のベントナイト等に代わって、ろ水量（透水
係数）の小さな良質のマッドケーキを切羽や溝壁に形成
し、切羽等を安定させる。したがって、本発明の掘削泥
水用分散剤と掘削土の細粒分さえあれば、泥水工法に必
要な機能を有する泥水を作製することができる。In the excavating mud dispersant according to the present invention and the excavating mud using the same, the excavating mud dispersant of the present invention remarkably disperses the fine particles of the soil, and disperses the fine particles of the dispersed soil. In place of conventional bentonite, a high quality mud cake having a small amount of drainage (permeability) is formed on a face or a groove wall to stabilize the face. Therefore, muddy water having the functions required for the muddy water method can be produced as long as the dispersant for excavated muddy water of the present invention and fine particles of excavated soil are present.
【００１３】また、泥水比重が高くなっても、本発明の
掘削泥水用分散剤による高い分散作用によって低粘性が
維持されるので、揚泥、スラリー輸送あるいは土砂分離
におけるポンプ等への負担が軽減され、掘削効率、輸送
効率あるいは土砂分離効率が向上して、結局、掘削シス
テム全体の効率が大幅に向上する。Further, even when the specific gravity of the muddy water is increased, the low viscosity is maintained by the high dispersing action of the dispersant for drilling muddy water of the present invention, so that the burden on pumps and the like in lifting mud, slurry transportation or sediment separation is reduced. As a result, the excavation efficiency, transportation efficiency or sediment separation efficiency is improved, and as a result, the efficiency of the entire excavation system is greatly improved.
【００１４】また、従来であれば、地中連続壁工法で使
用する場合において、セメントからのカルシウムイオン
でベントナイト等が凝集し、その分散性の低下ひいては
造壁性の低下を招いたり粘性が増加して泥水が劣化する
原因となっていたが、本発明の掘削泥水用分散剤におい
ては、分散性能自体が従来のものより高く、しかも、本
発明の掘削泥水用分散剤がカルシウムイオンと反応して
その活性を失わせる機能があるため、地中連続壁工法で
使用する場合にも細粒分の分散性が低下せず、泥水機能
が劣化することがない。したがって、従来のように大量
の廃棄泥水が発生することもない。Further, conventionally, when used in the underground continuous wall construction method, calcium ions from cement aggregate bentonite and the like, resulting in a decrease in dispersibility and, consequently, a decrease in wall buildability and an increase in viscosity. However, in the dispersant for drilling mud of the present invention, the dispersing performance itself is higher than the conventional one, and the dispersant for drilling mud of the present invention reacts with calcium ions. Since it has a function to lose its activity, the dispersibility of fine particles does not decrease even when used in the underground continuous wall construction method, and the muddy water function does not deteriorate. Therefore, a large amount of waste mud does not occur as in the related art.
【００１５】本発明に係る掘削泥水用分散剤の使用方法
としては、土の細粒分ととともに水に混入してなる本発
明の掘削用泥水として使用するほか、劣化泥水を再生す
る際の分散剤としても使用することができる。The method of using the dispersing agent for drilling mud according to the present invention includes, as well as the use of the mud for excavation of the present invention, which is mixed with fine particles of soil and water, and the dispersing agent for regenerating the degraded mud. It can also be used as an agent.
【００１６】ここで、かかる劣化泥水には、ベントナイ
ト等を用いた従来型の泥水はもちろんのこと、本発明に
係る掘削用泥水も含まれる。すなわち、本発明に係る掘
削用泥水を使用する場合でも、コンクリートや土壌によ
っては、上述したようなカルシウムイオンによる塩類凝
集が若干起こる可能性はある。しかし、その場合であっ
ても、本発明の掘削泥水用分散剤を補充添加すれば、前
述したようにカルシウムイオンの活性を低下させて分散
性を回復させることが可能となる。Here, the deteriorated muddy water includes not only a conventional muddy water using bentonite or the like but also a drilling muddy water according to the present invention. That is, even when the muddy water for excavation according to the present invention is used, salt aggregation by calcium ions as described above may slightly occur depending on concrete or soil. However, even in this case, if the dispersant for drilling mud of the present invention is replenished and added, the activity of calcium ions can be reduced and the dispersibility can be restored as described above.
【００１７】なお、劣化泥水の分散性を回復するのに、
従来、炭酸ナトリウムがよく使用されていたが、かかる
薬剤を過剰添加したときに生じる塩類凝集という逆効果
は、本発明の掘削泥水用分散剤では発生せず、かくして
塩類凝集を懸念することなく、本発明の掘削泥水用分散
剤を所望の量だけ添加することができる。In order to restore the dispersibility of the degraded mud,
Conventionally, sodium carbonate has often been used, but the adverse effect of salt coagulation that occurs when such an agent is excessively added does not occur in the dispersant for drilling muddy water of the present invention, and thus, without fear of salt coagulation, The dispersant for drilling mud of the present invention can be added in a desired amount.
【００１８】本発明に係る掘削泥水用分散剤は、ポリア
クリル酸塩、あるいはポリメタクリル酸塩のみから構成
してもよいし、それらの共重合体として構成してもよ
い。また、これらの共重合体を併用してもよい。ここ
で、それらの重量平均分子量Ｍｗを１００００乃至１４
０００としたのは、かかる範囲内であればベントナイト
等を使用せずとも土粒子の細粒分のみで泥水としての機
能を果たし得ることが実験で確認できたからである。ち
なみに、重量平均分子量Ｍｗは、ゲルパーミェーション
クロマトグラフ（ＧＰＣ）でポリスチレン基準で求めた
ものである。The drilling mud dispersant according to the present invention may be composed solely of polyacrylate or polymethacrylate, or may be composed of a copolymer thereof. Further, these copolymers may be used in combination. Here, their weight average molecular weight Mw is 10,000 to 14
The reason for setting the value to 000 was that it was confirmed by experiments that within the above range, the function of muddy water could be achieved only by fine particles of soil particles without using bentonite or the like. Incidentally, the weight average molecular weight Mw is determined by gel permeation chromatography (GPC) based on polystyrene.
【００１９】なお、従来技術で述べたように、溝壁や切
羽を安定させるだけの造壁性を確保するためには、泥水
中にベントナイト、ＣＭＣ、ポリマー剤等を添加しなけ
ればならないというのが当業者の常識であったが、本発
明は、ベントナイト等を使用せずとも現場の掘削土のみ
を用いて泥水の機能を得ることができないかという点に
着眼し、その着眼に基づいて多数の実験を繰り返し行っ
た結果、それらの成果として上述の分子量範囲が特定で
きたのであって、かかる分子量範囲を当業者が容易に採
択できるようなものではないことを念のため付言してお
く。As described in the prior art, it is necessary to add bentonite, CMC, a polymer agent, etc. to the muddy water in order to secure the wall-forming property enough to stabilize the groove wall and the face. Although it was common knowledge of those skilled in the art, the present invention focuses on whether it is possible to obtain muddy water function using only excavated soil at the site without using bentonite etc. As a result of repetition of the experiment described above, the molecular weight range described above was identified as a result thereof, and it should be noted that such a molecular weight range cannot be easily adopted by those skilled in the art.
【００２０】重量平均分子量Ｍｗが上述の範囲であれ
ば、土粒子の細粒分を著しく分散させることができる
が、上述したポリアクリル酸塩、ポリメタクリル酸塩若
しくはそれらの共重合体を特に、ナトリウム塩、カリウ
ム塩、リチウム塩といったアルカリ金属塩やアンモニウ
ム塩などの一価塩としたならば、わずかな添加量で安定
液としての機能を確実に得ることができる。When the weight average molecular weight Mw is in the above range, the fine particles of the soil particles can be remarkably dispersed, but the above-mentioned polyacrylate, polymethacrylate or a copolymer thereof is particularly preferred. If a monovalent salt such as an alkali metal salt such as a sodium salt, a potassium salt, or a lithium salt or an ammonium salt is used, the function as a stabilizer can be reliably obtained with a small amount of addition.
【００２１】土の細粒分としては、粘土及びシルトが主
成分となる７５μｍ以下が目安となるが、特に粘土が主
成分となる１０μｍ以下の細粒分を使用するようにすれ
ば、造壁性に優れた泥水とすることができる。The fine fraction of the soil is generally 75 μm or less, which is mainly composed of clay and silt. However, if the fine fraction of 10 μm or less mainly composed of clay is used, the wall can be formed. Muddy water with excellent properties can be obtained.
【００２２】[0022]
【発明の実施の形態】以下、本発明に係る掘削泥水用分
散剤及びそれを用いた掘削用泥水の実施の形態につい
て、添付図面を参照して説明する。なお、従来技術と実
質的に同一の部品等については同一の符号を付してその
説明を省略する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a drilling mud dispersant according to the present invention and a drilling mud using the same will be described below with reference to the accompanying drawings. It is to be noted that the same reference numerals are given to components and the like that are substantially the same as those in the conventional technology, and description thereof will be omitted.
【００２３】図１は、本実施形態に係る掘削泥水用分散
剤を示した化学構造式である。同図でわかるように、本
実施形態の掘削泥水用分散剤１は、ポリアクリル酸のナ
トリウム塩からなり、その重量平均分子量Ｍｗを１００
００乃至１４０００としてある。FIG. 1 is a chemical structural formula showing a dispersant for drilling mud according to this embodiment. As can be seen from the figure, the dispersant 1 for drilling mud of the present embodiment is made of a sodium salt of polyacrylic acid, and has a weight average molecular weight Mw of 100.
00 to 14000.
【００２４】本実施形態の掘削泥水用分散剤１を用いて
本実施形態の掘削用泥水を作製するには、該分散剤を、
粘土を主成分とする１０μｍ以下の細粒分とともに水に
混入する。かかる細粒分を含んだ水としては、具体的に
はシールド工法や地中連続壁工法といった泥水工法の土
砂分離工程で使用されるデカンタのオーバー泥水や廃棄
泥水を必要に応じて比重調整して使用することができ
る。なお、かかる泥水は、工事開始時には他現場から調
達し、工事開始後は、該工事現場で発生するデカンタの
オーバー泥水を利用するようにするのがよい。To prepare the drilling mud of the present embodiment using the drilling mud dispersant 1 of the present embodiment,
It is mixed with water together with a fine particle of 10 μm or less mainly composed of clay. As the water containing such fine particles, specifically, the specific gravity of the decanter over mud or waste mud used in the sediment separation step of the muddy water method such as the shield method or the underground continuous wall method is adjusted as necessary. Can be used. It is preferable to procure such muddy water from another site at the start of the construction, and to use the decanter over muddy water generated at the construction site after the start of the construction.
【００２５】このようにして作製された本実施形態の掘
削用泥水をシールド工法や地中連続壁工法の安定液とし
て使用すると、掘削泥水用分散剤１が１０μｍ以下の細
粒分を著しく分散させ、該細粒分は、従来のベントナイ
ト等に代わって、ろ水量（透水係数）の小さな良質のマ
ッドケーキを切羽や溝壁に形成し、切羽等を安定させ
る。When the drilling mud of the present embodiment thus produced is used as a stabilizing solution for the shield method or the diaphragm wall method, the excavating mud dispersant 1 remarkably disperses fine particles of 10 μm or less. The fine particles replace the conventional bentonite and the like, and form a high-quality mud cake having a small amount of drainage (permeability) on the face and the groove wall to stabilize the face and the like.
【００２６】図２(a)は、重量平均分子量Ｍｗを１１３
００とした場合の掘削泥水用分散剤１を水に溶かして４
０重量％の水溶液とし、これを泥水１ｍ３あたり８ｋｇ
添加されてなる本実施形態の掘削用泥水の造壁性を示し
たグラフであり、該分散剤が添加されていない場合につ
いても併せて示してある。ここで、同図における造壁性
は、ＡＰＩ規格でいうところの指標とは若干異なり、濾
水プロセスを促進させて実験時間を短縮させるべく、濾
紙の下側を減圧状態とした場合の濾水量として計測した
ものであり、５ｍｌ以下が良好な造壁性の目安とされ
る。なお、以下、特記なき限り、掘削泥水用分散剤１
は、４０重量％の水溶液としたのものを使用するととも
に、その添加量は、泥水容量をＶ（ｍ３）、添加重量を
Ｍ（ｋｇ）としたときに｛（Ｍ／Ｖ）／１０｝％として
表記するものとする。例えば、０．８％は、泥水１ｍ３
あたり８ｋｇを添加したことを表す。FIG. 2A shows that the weight average molecular weight Mw is 113
The dispersant 1 for drilling mud is set to 00
0 and the weight% aqueous solution, 8 kg per mud 1 m 3 of this
It is the graph which showed the wall formation property of the mud for excavation of this embodiment which is added, and also shows the case where the dispersant is not added. Here, the wall-forming property in the figure is slightly different from the index in the API standard, and the drainage amount when the lower side of the filter paper is depressurized in order to accelerate the drainage process and shorten the experiment time. And 5 ml or less is a measure of good wall-forming properties. In the following, unless otherwise specified, the dispersing agent for drilling muddy water 1
Is used as a 40% by weight aqueous solution, and the amount of addition is {(M / V) / 10} when the mud volume is V (m 3 ) and the addition weight is M (kg). It shall be expressed as%. For example, 0.8% is 1 m 3 of muddy water.
8 kg was added per unit.
【００２７】同図から、細粒分のみからなる泥水（黒
丸）では、良好な造壁性を確保できないのに対し、０．
８％の掘削泥水用分散剤１が添加された本実施形態の掘
削用泥水では、比重が１．０５を上回る領域で良好な造
壁性が確保できることがわかる。From the figure, it can be seen that muddy water (black circles) consisting only of fine particles cannot ensure good wall-forming properties.
It can be seen that in the muddy water for excavation of this embodiment to which 8% of the dispersant 1 for excavated muddy water is added, good wall-forming properties can be secured in a region where the specific gravity exceeds 1.05.
【００２８】図２(b)、(c)は、掘削泥水用分散剤を添加
しない場合、並びに掘削泥水用分散剤１（重量平均分子
量Ｍｗは上述したものと同じく１１３００）を０．２
％、０．４％、０．６％、０．８％添加した場合のファ
ンネル粘度（Ｆｖ）とＢ型（ブルックフィールド型）粘
度（Ｂｖ）とをそれぞれ示したグラフである。FIGS. 2 (b) and 2 (c) show the case where the dispersant for drilling mud is not added and the dispersant 1 for drilling mud (the weight average molecular weight Mw is 11300, which is the same as that described above) is 0.2%.
3 is a graph showing the funnel viscosity (Fv) and the B type (Brookfield type) viscosity (Bv) when%, 0.4%, 0.6%, and 0.8% are added, respectively.
【００２９】これらの図から、本実施形態の掘削泥水用
分散剤１を一定量添加した場合、特に０．４％以上添加
した場合には、泥水比重が高くなっても、低粘性に維持
されていることがわかる。なお、掘削泥水用分散剤１の
添加量が多いほど低粘性になるが、３％を越えて添加し
ても添加量に見合う効果は得られない。From these figures, it can be seen that when a certain amount of the dispersant 1 for drilling mud of the present embodiment is added, particularly when 0.4% or more is added, the viscosity is maintained low even if the specific gravity of the mud becomes high. You can see that it is. In addition, as the addition amount of the excavating muddy water dispersant 1 increases, the viscosity becomes lower, but even if it exceeds 3%, the effect corresponding to the addition amount cannot be obtained.
【００３０】図３、図４は、本実施形態の掘削泥水用分
散剤１における重量平均分子量Ｍｗと粘度との関係を、
セメントが添加されていない場合と泥水１ｍ３あたり２
０ｋｇのセメントが添加された場合についてそれぞれ示
したグラフである。なお、ここでは、泥水比重をそれぞ
れ１．１１５としてある。FIGS. 3 and 4 show the relationship between the weight average molecular weight Mw and the viscosity of the dispersant 1 for drilling mud according to the present embodiment.
If the cement is not added and the muddy water 1m 3 per 2
It is the graph each shown about the case where 0 kg of cement was added. Here, the specific gravity of the muddy water is set to 1.115, respectively.
【００３１】これらの図から、重量平均分子量Ｍｗを１
００００乃至１４０００とすると、低粘性を実現するこ
とが可能となることがわかる。なお、かかる低粘性を上
述した比重下で実現できることは、すなわち１０μｍ以
下の細粒分の分散性の高さ、ひいては造壁性の良好性を
意味するものである。From these figures, it can be seen that the weight average molecular weight Mw is 1
It can be seen that when it is 0000 to 14000, low viscosity can be realized. The fact that such a low viscosity can be realized under the above specific gravity means that the fine particles having a particle size of 10 μm or less have high dispersibility and, consequently, good wall-forming properties.
【００３２】以上述べたように、本実施形態に係る掘削
泥水用分散剤及びそれを用いた掘削用泥水によれば、泥
水中で著しく分散された１０μｍ以下の細粒分が切羽や
溝壁で良質のマッドケーキを形成し、該切羽等を安定さ
せるので、従来不可欠とされていたベントナイト、ＣＭ
Ｃ、ポリマー剤等の作泥材料を用いずとも、掘削泥水用
分散剤１と掘削土の細粒分さえあれば、泥水工法に必要
な造壁性を有する泥水を作製することができる。As described above, according to the dispersing agent for drilling mud according to the present embodiment and the drilling mud using the same, fine particles of 10 μm or less, which are remarkably dispersed in the mud, are generated at the face and groove wall. Bentonite, CM which has been indispensable in the past because it forms a high quality mud cake and stabilizes the face
Even if mud making materials such as C and a polymer agent are not used, muddy water having wall-forming properties required for the muddy water method can be produced as long as the dispersant 1 for excavated muddy water and fine particles of excavated soil are present.
【００３３】したがって、掘削土を作泥材料として有効
利用することが可能となる。また、ベントナイト等では
攪拌混合のための混練ミキサが必要であったのに対し、
水溶液として使用可能な掘削泥水用分散剤１では混練ミ
キサが不要になり、上述した掘削土自体が作泥材料とな
ることと相まって、作泥材料の貯留や攪拌を行うための
プラントやストックヤードを大幅に縮小ないしは省略す
ることが可能となるとともに、作泥時間の大幅短縮を図
ることも可能となる。Therefore, it is possible to effectively use the excavated soil as a mud material. Also, in the case of bentonite etc., a kneading mixer for stirring and mixing was required,
The dispersant 1 for drilling mud which can be used as an aqueous solution eliminates the need for a kneading mixer, and in combination with the above-mentioned excavated soil itself becoming mud material, a plant or stock yard for storing and stirring mud material is required. It is possible to greatly reduce or omit, and it is also possible to significantly reduce the mud making time.
【００３４】また、図２に示したように、泥水比重が高
くなっても、低粘性が維持されるので、揚泥、スラリー
輸送あるいは土砂分離におけるポンプ等への負担が軽減
され、掘削効率、輸送効率あるいは土砂分離効率が向上
する。すなわち、掘削作業に伴って掘削土が泥水中に混
入してくると、従来においては、泥水比重の上昇ととも
に粘性も増加し、かかる粘性増加が揚泥ポンプやスラリ
ーポンプへの負荷を大きくし、あるいは輸送管内での摩
擦を高めることになるため、掘削速度を抑えざるを得な
かったが、本実施形態に係る掘削泥水用分散剤１を用い
た掘削用泥水によれば、泥水比重が高くなっても低粘性
が維持されるので、掘削速度を高く設定することができ
るとともに、細粒分の比重が高い泥水をデカンタに打ち
込むことができるので、デカンタでの土砂分離効率も高
くなる。かくして、本実施形態に係る掘削用泥水によれ
ば、シールド工法にしろ地中連続壁工法にしろ、全体の
掘削効率を大幅に向上させることが可能となる。なお、
地中連続壁工法では、コンクリート打設の際だけ必要に
応じて低比重の泥水に置換するようにすれば、掘削中の
泥水比重が増加してもコンクリートとの置換作業には何
らの支障も生じない。Further, as shown in FIG. 2, even if the specific gravity of the muddy water is increased, the low viscosity is maintained, so that the load on a pump or the like in lifting mud, slurry transportation or sediment separation is reduced, and the excavation efficiency, Transport efficiency or sediment separation efficiency is improved. That is, when the excavated soil is mixed into the muddy water with the excavation work, conventionally, the viscosity also increases with the increase in the specific gravity of the muddy water, and the increase in the viscosity increases the load on the mud pump and the slurry pump, Alternatively, since the friction in the transport pipe is increased, the excavation speed has to be suppressed. However, according to the excavation mud using the excavating mud dispersant 1 according to the present embodiment, the specific gravity of the mud is increased. However, since the low viscosity is maintained, the excavation speed can be set high, and the muddy water having a high specific gravity of fine particles can be driven into the decanter, so that the sediment separation efficiency in the decanter also increases. Thus, according to the muddy water for excavation according to the present embodiment, the entire excavation efficiency can be greatly improved regardless of the shield method or the underground continuous wall method. In addition,
In the underground diaphragm wall method, if the concrete is replaced with low-density mud only when necessary, even if the specific gravity of mud increases during excavation, there will be no hindrance to the replacement work with concrete. Does not occur.
【００３５】また、地中連続壁工法で泥水を循環使用す
る場合、従来であれば、セメントからのカルシウムイオ
ンでベントナイト等が凝集し、その分散性の低下ひいて
は造壁性の低下を招いて泥水が劣化する原因となってい
たが、本実施形態の掘削泥水用分散剤１によれば、従来
の泥水に比べて分散性能自体が高く、しかも掘削泥水用
分散剤１がカルシウムイオンと反応してその活性を失わ
せる機能があるので、循環使用しても分散性が低下せ
ず、いわゆる泥水劣化が生じない。したがって、従来の
ように大量の廃棄泥水が発生する事態を未然に防止する
ことが可能となり、それに伴って廃棄物処分コストの低
減を図ることも可能となる。In the case where muddy water is circulated and used by the underground continuous wall method, conventionally, bentonite or the like is agglomerated by calcium ions from cement, and the dispersibility of the bentonite and the like is reduced. However, according to the drilling mud dispersant 1 of the present embodiment, the dispersion performance itself is higher than the conventional mud, and the drilling mud dispersant 1 reacts with calcium ions. Since it has a function of losing its activity, even if it is recycled, the dispersibility does not decrease, and so-called muddy water deterioration does not occur. Therefore, it is possible to prevent a situation in which a large amount of waste mud is generated as in the related art, and accordingly, it is possible to reduce waste disposal costs.
【００３６】本実施形態では、掘削泥水用分散剤１を新
しい掘削用泥水を作製するのに使用することを前提とし
たが、これに代えて、劣化泥水を再生する際の分散剤と
しても使用することができる。すなわち、ベントナイト
等を用いた従来型の泥水が循環使用によって劣化した場
合には、掘削泥水用分散剤１を添加することによって凝
集していたベントナイト等を分散させ、安定液としての
機能を回復させることができる。なお、本実施形態に係
る掘削用泥水は、上述したようにカルシウムイオンによ
る塩類凝集を生じにくいが、度重なる循環使用その他の
理由によって分散性が低下した場合には、該分散性を回
復させるべく、本実施形態の掘削用泥水に掘削泥水用分
散剤１を添加するようにしてもよいことは言うまでもな
い。In the present embodiment, it is assumed that the dispersing agent 1 for drilling mud is used for preparing a new mud for drilling. However, the dispersing agent 1 is also used as a dispersing agent for regenerating degraded mud. can do. In other words, when the conventional mud using bentonite or the like is deteriorated due to circulating use, the aggregated bentonite or the like is dispersed by adding the dispersant 1 for drilling mud to recover the function as a stable liquid. be able to. In addition, the drilling mud according to the present embodiment is unlikely to cause salt aggregation due to calcium ions as described above, but when the dispersibility is reduced due to repeated use or other reasons, in order to recover the dispersibility. Needless to say, the dispersant 1 for drilling mud may be added to the mud for drilling of the present embodiment.
【００３７】なお、劣化泥水の分散性を回復するのに従
来、炭酸ナトリウムがよく使用されていたが、かかる薬
剤を過剰添加すると、図５に示すように、塩類凝集が生
じて造壁性が低下する傾向にあり、したがって劣化泥水
を再生させるにも限度があったが、本実施形態に係る掘
削泥水用分散剤１では同図でわかるように、添加量を増
加させても塩類凝集による造壁性の低下は見られない。
したがって、本実施形態に係る掘削泥水用分散剤１によ
れば、塩類凝集を懸念することなく、所望の量だけ添加
して劣化泥水の再生を図ることができる。Incidentally, sodium carbonate has conventionally been often used to recover the dispersibility of the degraded muddy water. However, when such a chemical is excessively added, salt aggregation occurs as shown in FIG. Although there is a limit to the regeneration of the degraded muddy water, there is a limit to regenerating the degraded muddy water. However, as can be seen from FIG. No decrease in wall properties is observed.
Therefore, according to the dispersant 1 for drilling muddy water according to the present embodiment, it is possible to regenerate the degraded muddy water by adding a desired amount thereof without worrying about salt aggregation.
【００３８】また、本実施形態では、ポリアクリル酸の
ナトリウム塩で掘削泥水用分散剤１を構成したが、これ
に代えて、カリウム塩、リチウム塩といったアルカリ金
属塩やアンモニウム塩などの一価塩としてもよい。図６
は、ポリアクリル酸塩の末端基の影響を調べた実験結果
であり、上述した一価塩に対しては、良好な低粘性が維
持されていることがわかる。In the present embodiment, the dispersant 1 for drilling muddy water is composed of a sodium salt of polyacrylic acid, but instead of this, a monovalent salt such as an alkali metal salt such as a potassium salt or a lithium salt or an ammonium salt is used. It may be. FIG.
Is an experimental result of examining the influence of the terminal group of the polyacrylate, and it can be seen that good low viscosity is maintained with respect to the above-mentioned monovalent salt.
【００３９】また、本実施形態では、ポリアクリル酸ナ
トリウム塩で掘削泥水用分散剤１を構成したが、かかる
ポリアクリル酸ナトリウム塩に代えてポリメタクリル酸
ナトリウム塩若しくはそれらの共重合体を用いても実施
形態で述べたと同様の作用効果を得ることができる。In this embodiment, the dispersant 1 for drilling muddy water is composed of sodium polyacrylate, but instead of sodium polyacrylate, sodium polymethacrylate or a copolymer thereof is used. The same operation and effect as described in the embodiment can be obtained.
【００４０】[0040]
【発明の効果】以上述べたように、本発明の掘削泥水用
分散剤及びそれを用いた掘削泥水によれば、従来不可欠
とされていたベントナイト等の作泥材料を用いずとも、
掘削土の細粒分さえあれば、泥水工法に必要な造壁性を
有する泥水を作製することができる。したがって、掘削
土を作泥材料として有効利用することが可能となるとと
もに、作泥材料の貯留や攪拌を行うためのプラントやス
トックヤードを大幅に縮小ないしは省略することが可能
となるとともに、作泥時間の大幅短縮を図ることも可能
となる。As described above, according to the dispersing agent for drilling mud and the drilling mud using the same according to the present invention, it is possible to use a conventional mud-forming material such as bentonite, which is indispensable.
As long as there is only fine particles of the excavated soil, muddy water having wall forming properties required for the muddy water method can be produced. Therefore, the excavated soil can be effectively used as mud material, and a plant and a stock yard for storing and stirring the mud material can be significantly reduced or omitted. The time can be significantly reduced.
【００４１】また、泥水比重が高くなっても低粘性が維
持されるので、揚泥、スラリー輸送あるいは土砂分離に
おけるポンプ等への負担が軽減され、掘削効率、輸送効
率あるいは土砂分離効率が向上する。Further, since the low viscosity is maintained even when the specific gravity of the muddy water is increased, the burden on pumps and the like in mud lifting, slurry transport or sediment separation is reduced, and excavation efficiency, transport efficiency, or sediment separation efficiency is improved. .
【００４２】また、地中連続壁工法で循環使用する場合
であっても、本発明の掘削用泥水が劣化しないので、従
来のように大量の廃棄泥水が発生する事態を未然に防止
することが可能となる。Also, even in the case of circulating use by the underground continuous wall construction method, the muddy water for excavation of the present invention does not deteriorate, so that it is possible to prevent a situation in which a large amount of waste muddy water is generated unlike in the prior art. It becomes possible.
【００４３】また、請求項２に係る本発明の掘削泥水用
分散剤によれば、わずかな添加量で安定液としての機能
を確実に得ることができるという効果も奏する。Further, according to the dispersant for drilling mud according to the second aspect of the present invention, there is also an effect that a function as a stable liquid can be reliably obtained with a small amount of addition.
【００４４】また、請求項４に係る本発明の掘削用泥水
によれば、造壁性に優れた泥水とすることができるとい
う効果も奏する。According to the muddy water for excavation of the present invention according to claim 4, there is also an effect that muddy water having excellent wall-forming properties can be obtained.
【００４５】[0045]
【図１】本実施形態に係る掘削泥水用分散剤を示した化
学構造式。FIG. 1 is a chemical structural formula showing a dispersant for drilling mud according to the present embodiment.
【図２】本実施形態に係る掘削泥水用分散剤を用いた掘
削用泥水の作用を示したグラフであり、(a)は造壁性、
(b)はファンネル粘度、(c)はＢ型粘度をそれぞれ示した
グラフ。FIG. 2 is a graph showing the action of drilling mud using the drilling mud dispersant according to the present embodiment, where (a) is a wall-forming property,
(b) is a graph showing the funnel viscosity, and (c) is a graph showing the B-type viscosity.
【図３】本実施形態に係る掘削泥水用分散剤における分
子量と粘度との関係を示したグラフ。FIG. 3 is a graph showing the relationship between the molecular weight and the viscosity of the dispersant for drilling mud according to the present embodiment.
【図４】同じく、本実施形態に係る掘削泥水用分散剤に
おける分子量と粘度との関係を示したグラフ。FIG. 4 is a graph showing the relationship between the molecular weight and the viscosity of the dispersant for drilling mud according to the embodiment.
【図５】劣化泥水に対する再生効果を示したグラフ。FIG. 5 is a graph showing a regeneration effect on degraded muddy water.
【図６】末端基の影響を示したグラフ。FIG. 6 is a graph showing the influence of a terminal group.
１ 掘削泥水用分散剤 1 Dispersant for drilling mud
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川地 武 東京都清瀬市下清戸４丁目640 株式会社 大林組技術研究所内 (72)発明者 佐藤 祐司 東京都清瀬市下清戸４丁目640 株式会社 大林組技術研究所内 (72)発明者 谷水 好夫 京都府京都市東山区一橋野本町11番地の１ 三洋化成工業株式会社内 (72)発明者 本藤 文明 京都府京都市東山区一橋野本町11番地の１ 三洋化成工業株式会社内 (72)発明者 足立 有香 京都府京都市東山区一橋野本町11番地の１ 三洋化成工業株式会社内 Ｆターム(参考） 2D049 GA03 GC05 2D054 AC05 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Kawaji 4-640 Shimoseito, Kiyose-shi, Tokyo Inside the Obayashi-gumi Technical Research Institute Co., Ltd. (72) Inventor Yoshio Tanimizu Sanyo Kasei Kogyo Co., Ltd., 1-11, Hitotsubashi Nohoncho, Higashiyama-ku, Kyoto, Kyoto Prefecture (72) Inventor Fumiaki Motofuji 1-11, Hitotsubashi Nohoncho, Higashiyama-ku, Kyoto, Kyoto Sanyo Chemical Co., Ltd. (72) Inventor Yuka Adachi 1-1-1, Hitotsubashi-Honcho, Higashiyama-ku, Kyoto, Kyoto F-term (reference) 2D049 GA03 GC05 2D054 AC05
Claims (4)
若しくはそれらの共重合体からなり、重量平均分子量Ｍ
ｗを１００００乃至１４０００としたことを特徴とする
掘削泥水用分散剤。1. A polyacrylate, a polymethacrylate or a copolymer thereof, having a weight average molecular weight M
A dispersant for drilling mud, wherein w is 10,000 to 14,000.
酸塩若しくはそれらの共重合体を一価塩とした請求項１
記載の掘削泥水用分散剤。2. The polyacrylate, polymethacrylate or a copolymer thereof is a monovalent salt.
A dispersant for drilling mud as described in the above.
若しくはそれらの共重合体であって重量平均分子量Ｍｗ
が１００００乃至１４０００である掘削泥水用分散剤
と、細粒分からなる土とを含むことを特徴とする掘削用
泥水。3. A polyacrylate, a polymethacrylate or a copolymer thereof, having a weight average molecular weight Mw.
Characterized by comprising a dispersant for drilling mud having a particle size of 10,000 to 14000, and soil composed of fine particles.
３記載の掘削用泥水。4. The muddy water for drilling according to claim 3, wherein the fine particle content is 10 μm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25663098A JP3087961B2 (en) | 1998-09-10 | 1998-09-10 | Dispersing agent for drilling mud, mud for drilling using the same, and diaphragm wall construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25663098A JP3087961B2 (en) | 1998-09-10 | 1998-09-10 | Dispersing agent for drilling mud, mud for drilling using the same, and diaphragm wall construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000087023A true JP2000087023A (en) | 2000-03-28 |
| JP3087961B2 JP3087961B2 (en) | 2000-09-18 |
Family
ID=17295289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25663098A Expired - Lifetime JP3087961B2 (en) | 1998-09-10 | 1998-09-10 | Dispersing agent for drilling mud, mud for drilling using the same, and diaphragm wall construction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3087961B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002339690A (en) * | 2001-05-15 | 2002-11-27 | Konoike Constr Ltd | Slurry type pipe jacking method |
| JP2007009333A (en) * | 2006-10-23 | 2007-01-18 | Shinshu Univ | Plated structure and method of manufacturing the same |
| JP2008111130A (en) * | 2000-10-16 | 2008-05-15 | Ohbayashi Corp | Mud-forming system for well-drilling mud water |
| JP2010222707A (en) * | 2010-06-07 | 2010-10-07 | Shinshu Univ | Electroless plating method and electroless plating solution |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5967397B2 (en) * | 2011-02-07 | 2016-08-10 | 株式会社大林組 | Methods for insolubilizing hazardous substances |
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1998
- 1998-09-10 JP JP25663098A patent/JP3087961B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008111130A (en) * | 2000-10-16 | 2008-05-15 | Ohbayashi Corp | Mud-forming system for well-drilling mud water |
| JP4743441B2 (en) * | 2000-10-16 | 2011-08-10 | 株式会社大林組 | Mud production system for drilling mud |
| JP2002339690A (en) * | 2001-05-15 | 2002-11-27 | Konoike Constr Ltd | Slurry type pipe jacking method |
| JP4601853B2 (en) * | 2001-05-15 | 2010-12-22 | 株式会社鴻池組 | Muddy water type propulsion method |
| JP2007009333A (en) * | 2006-10-23 | 2007-01-18 | Shinshu Univ | Plated structure and method of manufacturing the same |
| JP4599565B2 (en) * | 2006-10-23 | 2010-12-15 | 国立大学法人信州大学 | Electrolytic plating method and electrolytic plating solution |
| JP2010222707A (en) * | 2010-06-07 | 2010-10-07 | Shinshu Univ | Electroless plating method and electroless plating solution |
Also Published As
| Publication number | Publication date |
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| JP3087961B2 (en) | 2000-09-18 |
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