JP3970966B2 - Earth pressure shield method additive - Google Patents
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- JP3970966B2 JP3970966B2 JP2026897A JP2026897A JP3970966B2 JP 3970966 B2 JP3970966 B2 JP 3970966B2 JP 2026897 A JP2026897 A JP 2026897A JP 2026897 A JP2026897 A JP 2026897A JP 3970966 B2 JP3970966 B2 JP 3970966B2
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【０００１】
【産業上の利用分野】
本発明は、土圧系シールド工法添加剤の改良に関わる。更に詳しくは、掘削土砂に対し添加して止水性と潤滑性を与えることにより良好な掘進を可能とすると共に、ポンプ圧送できるような保水性と流動性を付与できる土圧系シールド工法添加剤及びこの添加剤を使用する土圧系シールド工法に関する。
【０００２】
【従来技術】
土圧系シールド工法は、シルト、粘土等の軟弱地盤では、掘削、排土が可能であったが、砂礫地盤においては、切羽土砂の流動性が悪いため、掘削土砂をカッターチャンバー内に充満させることができないので、カッターチャンバー上部に空洞を生じてしまう。この空洞部には湧水とともに土砂が崩落し、その結果切羽の安定が保てなくなるといった問題を有している。また、砂礫地盤においては、一般に手掘りシールド、機械式シールドにより掘削、排土を行っている。又砂礫の排土処理は、ポンプ圧送ができないため、ベルトコンベアーやトロッコにより運搬を行っており、経済的な観点及び作業効率の点からは好ましくない。
【０００３】
従来、水に、ポリアクリル酸ソーダ、ポリアクリルアミド、カルボキシメチルセルロースナトリウム、アルギン酸ソーダ、ＰＶＡ、澱粉等の水溶性高分子の１種または２種以上と粘土とを混入してなる土圧系シールド工法及び土圧系推進工法用加泥材（特開平７−８２５５９号）が提案されているが、この技術による添加剤は、粘土を利用しており環境面で問題がある。すなわち粘土を利用しているために、掘削土砂を普通の土として廃棄することが不可能であり、産業廃棄物としての扱いを受け、そのために経済性も悪い。また、この添加剤は、砂礫地盤の掘削土砂の流動性と止水性に関してはある程度効果が認められるが、ポンプ圧送については十分に満足のできる効果が認められない。
【０００４】
【発明が解決しようとする課題】
土圧系シールド工法により、砂礫地盤において掘削を行う際に、従来のベントナイト水溶液を切羽の先端から出るようにして掘削を行うと、切羽が不安定となり、またチャンバー内の掘削土砂の止水性と潤滑性にも限界がある。他方上記の水溶性高分子に粘土を加える方法（特開平７−８２５５９号）により掘削を行うと、掘削土砂は、ある程度の流動性と止水性を示すが、チャンバー内の掘削土砂をパイプによって流体輸送を行うには不十分な流動性を示すにすぎない。つまり上記の水溶性高分子に粘土を加える方法においては、パイプ輸送による経済性と作業性はメリットが大きいにも関わらず、砂礫地盤の掘削土砂のパイプ輸送が未だに確立できていない点で問題が残っている。また粘土を使用するために、掘削土砂は産業廃棄物となり、環境面にも問題が残っている。
【０００５】
さらにカルボキシメチルセルロースナトリウム水溶液を掘削した砂礫に加える方法も知られている。カルボキシメチルセルロースナトリウム（以下ＣＭＣと表記する）は、一般に増粘剤として使用され、食品添加物としても登録されている、安定性の高い物質である。しかし、ＣＭＣ水溶液を加えた掘削した砂礫は、ブリージングを起こしてしまい、安定した掘削、パイプによる流動輸送は不可能である。
【０００６】
本発明は、上記のような従来技術による添加剤の欠点を解消させ、砂礫地盤において安定して掘削することとパイプにより掘削土砂を排出することを可能とし、さらには掘削土砂を産業廃棄物扱いとすることを必要としない、土圧系シールド工法添加剤の提供を目的とする。
【０００７】
【課題を解決するための手段】
本発明者等は、鋭意検討を行った結果、シールド機の切羽の安定した掘削を可能とし、排土がパイプ輸送可能となる土圧系シールド工法添加剤がＣＭＣと苛性ソーダ存在下の加水分解により一部ポリアクリル酸ソーダに変性したポリアクリルアミドの混合物により得られることを見出し、本発明を完成するに至ったものである。すなわち本発明は、１％水溶液の粘度（25℃、Ｂ型粘度計）が4000〜12000ｃｐｓ のカルボキシメチルセルロースナトリウムと苛性ソーダ存在下の加水分解により一部ポリアクリル酸ソーダに変性したポリアクリルアミドの混合物からなることを特徴とする土圧系シールド工法添加剤に関わるものである。本発明によれば、ＣＭＣのみではブリージングが起こるために限界があったが、高分子の凝集剤として使用されているポリアクリルアミドとＣＭＣとを複合することにより、シールド機の切羽の安定した掘削と排土のパイプ輸送を可能とし、残土処理の処理方法（特開平０７−２８４８００号）により元の地山に戻すことができ、また粘土を使用しないことにより排土が産業廃棄物の扱いとならない土圧系シールド工法添加剤が提供される。
【０００８】
【発明実施の形態】
上記の如く、本発明の土圧系シールド添加剤は、カルボキシメチルセルロースナトリウム（ＣＭＣ）と苛性ソーダ存在下の加水分解により一部ポリアクリル酸ソーダに変性したポリアクリルアミドの混合物からなるが、本発明に使用されるＣＭＣは、掘削土砂のブリージングを防ぐ目的から、高粘品であることが望ましい。詳しくは、ＣＭＣの１％水溶液の粘度（25℃、Ｂ型粘度計）が 4000〜12000ｃｐｓであることが望ましく、さらには 8000〜12000ｃｐｓであることがより望ましい。またＤＳ（グルコース１個当たりの置換割合）＝0.7〜1.2のものが望ましい。１％水溶液の粘度が4000ｃｐｓ未満であると、掘削土砂をパイプ輸送する際にブリージングが起こりやすくなり好ましくない。又高粘度のＣＭＣが望ましいが、実際には 12000ｃｐｓより高い粘度を有するＣＭＣは得られない。
【０００９】
本発明の土圧系シールド工法添加剤に使用されるポリアクリルアミドは、一般的に水処理剤として使用されている高分子凝集剤であり、安全性の高い物質である。使用されるポリアクリルアミドは、掘削土砂のブリージングを防ぐため、高粘品が望ましい。詳しくはポリアクリルアミドの0.1％水溶液の粘度（ 25℃、Ｂ型粘度計 No.２ローター、60ｒｐｍ）が200〜400ｃｐｓ、分子量が 800万〜1700万のものが望ましい。さらに、本発明において使用されるポリアクリルアミドは、苛性ソーダ存在下で一部ポリアクリル酸ソーダに変性したものであり、その加水分解度は20〜40％が適当である。
【００１０】
本発明の土圧系シールド工法添加剤は、ＣＭＣとポリアクリルアミドの重量比が50／50〜90／10の範囲で混合されることが、良好な掘削を実現させる止水性と潤滑性及び良好なポンプ圧送を実現させる保水性と流動性の点から望ましい。さらにＣＭＣとポリアクリルアミドの重量比が60／40〜80／20の範囲のものがより望ましい。
【００１１】
本発明の土圧系シールド工法添加剤は、対象となる土砂に合わせて、水道水などの水により適宜好ましい濃度に希釈して使用される。ＣＭＣとポリアクリルアミドはそれぞれ固体のものを混合してから水溶液としても、水溶液となったもの同士を混合しても、どちらか一方の水溶液にもう一方の固体を混合しても、いずれでも構わない。
【００１２】
【実施例】
以下実施例及び比較例をあげて本発明を説明するが、本発明はこれらの実施例に限定されるものではない。
【００１３】
実施例１〜５
１％水溶液粘度が9930ｃｐｓ（25℃、Ｂ型粘度計No.４ローター、60ｒｐｍ）、ＤＳ＝0.76のＣＭＣ [ＣＭＣダイセル<2280>、ダイセル化学工業（株）製] を使用し、また、0.1％水溶液粘度が 305ｃｐｓ（25℃、Ｂ型粘度計No.２ローター、60ｒｐｍ）、加水分解度30％のポリアクリルアミド [アコフロックＡ130 、三井サイテック（株）] を使用し、両者の混合割合をＣＭＣ／ポリアクリルアミド＝50／50、60／40、70／30、80／20、90／10（重量比）とし、水道水を使用して、 0.6重量％濃度の水溶液を作成した。この水溶液を鬼怒川産川砂（含水率14.0％）3000ｃｍ3に対して、 600ｃｍ3添加混合して、掘削土砂を調整した。この掘削土砂は非常に粘稠で流動性と止水性に富み、スランプ値は17.5〜23.0ｃｍであった。また、実施例２、３、４は材料分離せず、実施例１、５はほんの少し材料分離しているが、いずれもポンプ圧送が可能と判断できた。
【００１４】
実施例６
１％水溶液粘度が5060ｃｐｓ（25℃、Ｂ型粘度計No.４ローター、60ｒｐｍ）、ＤＳ＝0.89のＣＭＣ [ＣＭＣダイセル<2260>、ダイセル化学工業（株）製] を使用し、また、0.1％水溶液粘度が 305ｃｐｓ（25℃、Ｂ型粘度計No.２ローター、60ｒｐｍ）、加水分解度 30％のポリアクリルアミド[アコフロックＡ130 、三井サイテック（株）] を使用し、両者の混合割合をＣＭＣ／ポリアクリルアミド＝70／30（重量比）とし、水道水を使用して、 0.6重量％濃度の水溶液を作成した。この水溶液を鬼怒川産川砂（含水率14.0％）3000ｃｍ3に対して、 600ｃｍ3添加混合して、掘削土砂を調整した。この掘削土砂は粘稠で流動性と止水性があり、スランプ値は17.5ｃｍであった。また、ほんの少し材料分離しているが、ポンプ圧送が可能と判断できた。
【００１５】
比較例１
１％水溶液粘度が 9930ｃｐｓ（25℃、Ｂ型粘度計No.４ローター、60ｒｐｍ）、ＤＳ＝0.76のＣＭＣ [ＣＭＣダイセル<2280>、ダイセル化学工業（株）製] のみを使用し、水道水を使用して、 0.6重量％濃度の水溶液を作成した。この水溶液を鬼怒川産川砂（含水率14.0％）3000ｃｍ3に対して、600ｃｍ3 添加混合して、掘削土砂を調整した。この掘削土砂はパサパサしており、流動性に欠け、スランプ値は13.0ｃｍで、材料分離しており、容器の上部に水が浮いて、ポンプ圧送は不可能と判断できた。
【００１６】
比較例２、３
１％水溶液粘度が 9930ｃｐｓ（25℃、Ｂ型粘度計No.４ローター、60ｒｐｍ）、ＤＳ＝0.76のＣＭＣ [ＣＭＣダイセル<2280>、ダイセル化学工業（株）製] を使用し、また、0.1％水溶液粘度が 305ｃｐｓ（25℃、Ｂ型粘度計No.２ローター、60ｒｐｍ）、加水分解度30％のポリアクリルアミド [アコフロックＡ130 、三井サイテック（株）] を使用し、両者の混合割合を重量比でＣＭＣ／ポリアクリルアミド＝ 95/5（比較例２）、40/60（比較例３）とし、水道水を使用して、0.6重量％濃度の水溶液を作成した。この水溶液を鬼怒川産川砂（含水率 14.0％）3000ｃｍ3に対して、600ｃｍ3 添加混合して、掘削土砂を調整した。比較例２の掘削土砂は、スランプ値14.0ｃｍで止水性が劣り、材料分離しており、容器の上部に水が浮いて、ポンプ圧送は不可能と判断できた。比較例３の掘削土砂は、スランプ値25.0ｃｍで止水性が若干欠け、少し材料分離しており、ポンプ圧送が満足にできる状態ではなかった。
【００１７】
比較例４
１％水溶液粘度が 3100ｃｐｓ（25℃、Ｂ型粘度計No.４ローター、60ｒｐｍ）、ＤＳ＝0.63のＣＭＣ [ＣＭＣダイセル<2100>、ダイセル化学工業（株）製] を使用し、また、0.1％水溶液粘度が 305ｃｐｓ（25℃、Ｂ型粘度計No.２ローター、60ｒｐｍ）、加水分解度30％のポリアクリルアミド [アコフロックＡ130 、三井サイテック（株）] を使用し、両者の混合割合をＣＭＣ／ポリアクリルアミド＝70／30（重量比）とし、水道水を使用して、 0.6重量％濃度の水溶液を作成した。この水溶液を鬼怒川産川砂（含水率14.0％）3000ｃｍ3に対して、600ｃｍ3 添加混合して、掘削土砂を調整した。この掘削土砂は、粘性・まとまりがなく、流動性に欠け、スランプ値は、12.0ｃｍであった。また、材料分離がしており、容器の上部に水が浮いており、ポンプ圧送は不可能と判断できた。
【００１８】
比較例５
１％水溶液粘度が 9930ｃｐｓ（25℃、Ｂ型粘度計No.４ローター、60ｒｐｍ）、ＤＳ＝0.76のＣＭＣ [ＣＭＣダイセル<2280>、ダイセル化学工業（株）製] を使用し、また、0.1％水溶液粘度が 200ｃｐｓ（25℃、Ｂ型粘度計No.２ローター、60ｒｐｍ）、加水分解度 15％のポリアクリルアミド [アコフロックＡ100、三井サイテック（株）] を使用し、両者の混合割合をＣＭＣ／ポリアクリルアミド＝70／30（重量比）とし、水道水を使用して、 0.6重量％濃度の水溶液を作成した。この水溶液を鬼怒川産川砂（含水率14.0％）3000ｃｍ3に対して、600ｃｍ3 添加混合して、掘削土砂を調整した。この掘削土砂のスランプ値は、13.0ｃｍで、材料分離しており、ポンプ圧送は不可能と判断できた。
【００１９】
比較例６
１％水溶液粘度が 9930ｃｐｓ（25℃、Ｂ型粘度計No.４ローター、60ｒｐｍ）、ＤＳ＝0.76のＣＭＣ [ＣＭＣダイセル<2280>、ダイセル化学工業（株）製] とポリアクリル酸ソーダ [アクアリックＭＨＳ、日本触媒（株）製] 及び粘土 [ＴＢ−300 、立花マテリアル（株）製] を使用して各々の混合割合をＣＭＣ／ポリアクリル酸ソーダ／粘土＝15／15／70（重量比）とし、その２％水溶液を作成した。この水溶液を鬼怒川産川砂（含水率14.0％）3000ｃｍ3に対して、600ｃｍ3 添加混合して、掘削土砂を調整した。この掘削土砂は、止水性に欠け、スランプ値は16.0ｃｍであった。また、やや材料分離しており、容器の上部にほんの少しの水が浮いており、ポンプ圧送が満足にできる状態ではなかった。
【００２０】
【表１】
【表２】
（注１）材料不分離性は、分離せず（◎）、ほんの少し分離（○）、
やや分離（△）、分離（×）である。
【００２３】
【発明の効果】
本発明の土圧系シールド工法添加剤は、粘度を含有せずに特定の二成分から構成され、掘削土砂の流動性と止水性に優れているため、シールド機の切羽を安定させて、砂礫地盤の掘削を可能とする。また、排土処理は、粘土を添加しないため、掘削土砂を産業廃棄物としての扱いを受けず、又従来のベルトコンベアーやトロッコの運搬ではなく、経済性と作業性の良いポンプ輸送を可能とする。[0001]
[Industrial application fields]
The present invention relates to the improvement of earth pressure type shield construction additive. More specifically, an earth pressure-based shield method additive capable of imparting water-stopping and lubricity by adding to the excavated earth and sand, enabling water to be pumped and imparting water retention and fluidity, and The present invention relates to an earth pressure shield method using this additive.
[0002]
[Prior art]
In the earth pressure system shield method, excavation and soil removal were possible in soft ground such as silt and clay, but in the gravel ground, the fluidity of face soil is poor, so the excavated soil fills the cutter chamber. Since this is not possible, a cavity is created in the upper part of the cutter chamber. There is a problem that the sand collapses with the spring water in the cavity, and as a result, the stability of the face cannot be maintained. Moreover, in the gravel ground, excavation and soil removal are generally carried out by hand digging shield and mechanical shield. In addition, since the sand gravel removal process cannot be pumped, it is carried by a belt conveyor or a truck, which is not preferable from the viewpoint of economic efficiency and work efficiency.
[0003]
Conventionally, an earth pressure shield method in which water is mixed with one or more water-soluble polymers such as sodium polyacrylate, polyacrylamide, sodium carboxymethyl cellulose, sodium alginate, PVA, starch and clay and clay, and A mud-added material for earth pressure system propulsion method (JP-A-7-82559) has been proposed, but the additive by this technique uses clay and has an environmental problem. In other words, since clay is used, it is impossible to dispose of excavated earth and sand as ordinary soil, which is treated as industrial waste, and thus is not economical. In addition, this additive has some effect on the fluidity and water-stopping property of excavated soil on the gravel ground, but it does not have a sufficiently satisfactory effect on pumping.
[0004]
[Problems to be solved by the invention]
When excavating on the gravel ground by the earth pressure system shield method, if the excavation is performed with the conventional bentonite aqueous solution coming out from the tip of the face, the face becomes unstable, and the water resistance of the excavated soil in the chamber There is a limit to lubricity. On the other hand, when excavation is performed by the method of adding clay to the above water-soluble polymer (Japanese Patent Laid-Open No. 7-82559), the excavated earth and sand exhibits a certain degree of fluidity and water-stopping properties. It exhibits only insufficient fluidity for transport. In other words, the method of adding clay to the above water-soluble polymer has a problem in that the pipe transportation of excavated soil from gravel ground has not yet been established, although the economics and workability of pipe transportation are significant. Remaining. In addition, because clay is used, the excavated soil becomes industrial waste, and environmental problems still remain.
[0005]
Furthermore, a method of adding an aqueous sodium carboxymethyl cellulose solution to excavated sand gravel is also known. Sodium carboxymethylcellulose (hereinafter referred to as CMC) is a highly stable substance that is generally used as a thickener and is also registered as a food additive. However, the excavated sand and gravel added with the CMC aqueous solution causes breathing, and stable excavation and fluid transport using pipes are impossible.
[0006]
The present invention eliminates the drawbacks of the conventional additives as described above, enables stable excavation in gravel ground and discharge of excavated sediment by pipes, and further treats excavated sediment as industrial waste. It is an object of the present invention to provide an earth pressure shield method additive that does not need to be.
[0007]
[Means for Solving the Problems]
As a result of diligent investigation, the inventors have made stable excavation of the shield machine's face, and the earth pressure shield method additive that enables the soil to be transported by pipe is obtained by hydrolysis in the presence of CMC and caustic soda. It has been found that it can be obtained by a mixture of polyacrylamide partially modified with sodium polyacrylate, and has completed the present invention. That is, the present invention comprises a mixture of sodium carboxymethylcellulose having a viscosity of 1% aqueous solution (25 ° C., B-type viscometer) of 4000 to 12000 cps and polyacrylamide partially modified to sodium polyacrylate by hydrolysis in the presence of caustic soda. It is related to the earth pressure shield method additive characterized by the above. According to the present invention, there was a limit due to the occurrence of breathing with CMC alone, but by combining polyacrylamide used as a polymer flocculant and CMC, stable excavation of the face of the shield machine can be achieved. It enables pipe transportation of waste soil, it can be returned to the original ground by the processing method of remaining soil treatment (Japanese Patent Laid-Open No. 07-284800), and waste soil is not treated as industrial waste by not using clay Earth pressure shield construction additive is provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
As described above, the earth pressure shield additive of the present invention is composed of a mixture of sodium carboxymethylcellulose (CMC) and polyacrylamide partially modified to sodium polyacrylate by hydrolysis in the presence of caustic soda. It is desirable that the CMC to be made is a highly viscous product in order to prevent breathing of excavated soil. Specifically, the viscosity (25 ° C., B-type viscometer) of a 1% aqueous solution of CMC is desirably 4000 to 12000 cps, and more desirably 8000 to 12000 cps. Further, it is desirable that DS (substitution ratio per glucose) = 0.7 to 1.2. When the viscosity of the 1% aqueous solution is less than 4000 cps, breathing is likely to occur during pipe transportation of excavated earth and sand, which is not preferable. A high-viscosity CMC is desirable, but in practice, a CMC having a viscosity higher than 12000 cps cannot be obtained.
[0009]
The polyacrylamide used in the earth pressure shield method additive of the present invention is a polymer flocculant generally used as a water treatment agent and is a highly safe substance. The polyacrylamide used is preferably a highly viscous product in order to prevent breathing of excavated soil. Specifically, it is desirable that the viscosity of a 0.1% aqueous solution of polyacrylamide (25 ° C., B-type viscometer No. 2 rotor, 60 rpm) is 200 to 400 cps and the molecular weight is 8 to 17 million. Furthermore, the polyacrylamide used in the present invention is partially modified to sodium polyacrylate in the presence of caustic soda, and the degree of hydrolysis is suitably 20 to 40%.
[0010]
The earth pressure shield method additive of the present invention is mixed with a weight ratio of CMC and polyacrylamide in the range of 50/50 to 90/10, so that the water-stopping and lubricity and good excavation can be realized. It is desirable from the viewpoint of water retention and fluidity to realize pumping. Further, it is more preferable that the weight ratio of CMC to polyacrylamide is in the range of 60/40 to 80/20.
[0011]
The earth pressure shield method additive of the present invention is used by appropriately diluting it with water such as tap water according to the target earth and sand. CMC and polyacrylamide may be mixed with each other as an aqueous solution, mixed with each other as an aqueous solution, or mixed with one of the aqueous solutions and the other solid. .
[0012]
【Example】
Hereinafter, the present invention will be described with reference to examples and comparative examples, but the present invention is not limited to these examples.
[0013]
Examples 1-5
CMC [CMC Daicel <2280>, manufactured by Daicel Chemical Industries, Ltd.] having a 1% aqueous solution viscosity of 9930 cps (25 ° C., B-type viscometer No. 4 rotor, 60 rpm), DS = 0.76, 0.1% Polyacrylamide [Acofloc A130, Mitsui Cytec Co., Ltd.] with an aqueous solution viscosity of 305 cps (25 ° C, B-type viscometer No. 2 rotor, 60 rpm) and a hydrolysis degree of 30% was used. Acrylamide was 50/50, 60/40, 70/30, 80/20, 90/10 (weight ratio), and an aqueous solution having a concentration of 0.6% by weight was prepared using tap water. For this solution the Kinugawa production river sand (water content 14.0%) 3000cm 3, 600cm 3 was added and mixed to prepare a drilling soil. This excavated sediment was very viscous, rich in fluidity and water-stopping property, and the slump value was 17.5-23.0 cm. In Examples 2, 3, and 4, the material was not separated, and in Examples 1 and 5, the material was separated slightly, but it was determined that pumping was possible in all cases.
[0014]
Example 6
CMC with a 1% aqueous solution viscosity of 5060 cps (25 ° C., B-type viscometer No. 4 rotor, 60 rpm), DS = 0.89 [CMC Daicel <2260>, manufactured by Daicel Chemical Industries, Ltd.] and 0.1% Use polyacrylamide (Acofloc A130, Mitsui Cytec Co., Ltd.) with an aqueous solution viscosity of 305 cps (25 ° C, B-type viscometer No. 2 rotor, 60 rpm) and a hydrolysis degree of 30%. Acrylamide = 70/30 (weight ratio) was used, and an aqueous solution having a concentration of 0.6% by weight was prepared using tap water. For this solution the Kinugawa production river sand (water content 14.0%) 3000cm 3, 600cm 3 was added and mixed to prepare a drilling soil. This excavated sediment was viscous, fluid and water-stopping, and the slump value was 17.5 cm. Although the material was separated slightly, it was determined that pumping was possible.
[0015]
Comparative Example 1
1% aqueous solution viscosity is 9930cps (25 ° C, B-type viscometer No.4 rotor, 60rpm), DS = 0.76 CMC [CMC Daicel <2280>, manufactured by Daicel Chemical Industries, Ltd.] An aqueous solution having a concentration of 0.6% by weight was used. For this solution the Kinugawa production river sand (water content 14.0%) 3000cm 3, 600cm 3 was added and mixed to prepare a drilling soil. This excavated earth and sand was clumsy, lacked fluidity, slump value was 13.0cm, material was separated, water floated on the upper part of the vessel, and it was judged that pumping was impossible.
[0016]
Comparative Examples 2 and 3
CMC [CMC Daicel <2280>, manufactured by Daicel Chemical Industries, Ltd.] having a 1% aqueous solution viscosity of 9930 cps (25 ° C., B-type viscometer No. 4 rotor, 60 rpm), DS = 0.76, 0.1% Use polyacrylamide [Acofloc A130, Mitsui Cytec Co., Ltd.] with an aqueous solution viscosity of 305 cps (25 ° C, B-type viscometer No. 2 rotor, 60 rpm) and a hydrolysis degree of 30%. CMC / polyacrylamide = 95/5 (Comparative Example 2) and 40/60 (Comparative Example 3), and tap water was used to prepare a 0.6 wt% aqueous solution. For this solution the Kinugawa production river sand (water content 14.0%) 3000cm 3, 600cm 3 was added and mixed to prepare a drilling soil. The excavated earth and sand of Comparative Example 2 had a slump value of 14.0 cm, inferior water-stopping property, separated materials, water floated on the upper part of the container, and it was determined that pumping was impossible. The excavated earth and sand of Comparative Example 3 had a slump value of 25.0 cm, a little lack of water-stopping property, and a little material separation, and was not in a state where pumping could be satisfied satisfactorily.
[0017]
Comparative Example 4
CMC with a 1% aqueous solution viscosity of 3100 cps (25 ° C, B-type viscometer No. 4 rotor, 60 rpm), DS = 0.63 [CMC Daicel <2100>, manufactured by Daicel Chemical Industries, Ltd.] and 0.1% Polyacrylamide [Acofloc A130, Mitsui Cytec Co., Ltd.] with an aqueous solution viscosity of 305 cps (25 ° C, B-type viscometer No. 2 rotor, 60 rpm) and a hydrolysis degree of 30% was used. Acrylamide = 70/30 (weight ratio) was used, and an aqueous solution having a concentration of 0.6% by weight was prepared using tap water. For this solution the Kinugawa production river sand (water content 14.0%) 3000cm 3, 600cm 3 was added and mixed to prepare a drilling soil. This excavated earth and sand had no viscosity / cohesion, lacked fluidity, and the slump value was 12.0 cm. In addition, the materials were separated, and water floated at the top of the container, so it was determined that pumping was impossible.
[0018]
Comparative Example 5
CMC [CMC Daicel <2280>, manufactured by Daicel Chemical Industries, Ltd.] having a 1% aqueous solution viscosity of 9930 cps (25 ° C., B-type viscometer No. 4 rotor, 60 rpm), DS = 0.76, 0.1% Polyacrylamide [Acklock A100, Mitsui Cytec Co., Ltd.] with an aqueous solution viscosity of 200 cps (25 ° C, B-type viscometer No. 2 rotor, 60 rpm) and a hydrolysis degree of 15% was used. Acrylamide = 70/30 (weight ratio) was used, and an aqueous solution having a concentration of 0.6% by weight was prepared using tap water. For this solution the Kinugawa production river sand (water content 14.0%) 3000cm 3, 600cm 3 was added and mixed to prepare a drilling soil. The slump value of this excavated earth and sand was 13.0 cm, and the material was separated, and it was judged that pumping was impossible.
[0019]
Comparative Example 6
CMC with a 1% aqueous solution viscosity of 9930 cps (25 ° C, B-type viscometer No. 4 rotor, 60 rpm), DS = 0.76 [CMC Daicel <2280>, manufactured by Daicel Chemical Industries, Ltd.] and polyacrylic acid soda [AQUALIC MHS, manufactured by Nippon Shokubai Co., Ltd.] and clay [TB-300, manufactured by Tachibana Material Co., Ltd.], the mixing ratio of each was CMC / sodium polyacrylate / clay = 15/15/70 (weight ratio) And a 2% aqueous solution thereof was prepared. For this solution the Kinugawa production river sand (water content 14.0%) 3000cm 3, 600cm 3 was added and mixed to prepare a drilling soil. This excavated earth and sand lacked water-stopping property and had a slump value of 16.0 cm. In addition, the material was somewhat separated, and only a small amount of water was floating at the top of the container, and the pumping was not satisfactory.
[0020]
[Table 1]
[Table 2]
(Note 1) Material inseparability is not separated (◎), only slightly separated (○),
Slightly separated (Δ), separated (×).
[0023]
【The invention's effect】
The earth pressure system shield method additive of the present invention is composed of specific two components without containing viscosity, and excels in the fluidity and water blocking properties of excavated earth and sand, stabilizes the face of the shield machine, Allows excavation of the ground. In addition, since the clay does not add clay, the excavated sediment is not treated as industrial waste, and it is possible to transport the pump with good economic efficiency and workability, rather than the conventional conveyor belt or truck. To do.
Claims (2)
ポリアクリルアミドが、苛性ソーダ存在下の加水分解により 20 〜 40 ％ポリアクリル酸ソーダに変性したものであり、
カルボキシメチルセルロースナトリウムとポリアクリルアミドの重量比が、 50 ／ 50 〜 90 ／ 10 である、
土圧系シールド工法添加剤。 A soil characterized by comprising a mixture of sodium carboxymethylcellulose having a 1% aqueous solution viscosity (25 ° C., B-type viscometer) of 4000 to 12000 cps and polyacrylamide partially modified to sodium polyacrylate by hydrolysis in the presence of caustic soda. Pressure system shield method additive ,
Polyacrylamide, which was modified to 20-40% sodium polyacrylate by hydrolysis in the presence of caustic soda,
The weight ratio of sodium carboxymethylcellulose and polyacrylamide is 50 / 50-90 / 10,
Earth pressure shield method additive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2026897A JP3970966B2 (en) | 1997-02-03 | 1997-02-03 | Earth pressure shield method additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2026897A JP3970966B2 (en) | 1997-02-03 | 1997-02-03 | Earth pressure shield method additive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10219238A JPH10219238A (en) | 1998-08-18 |
| JP3970966B2 true JP3970966B2 (en) | 2007-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2026897A Expired - Lifetime JP3970966B2 (en) | 1997-02-03 | 1997-02-03 | Earth pressure shield method additive |
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| Country | Link |
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| JP (1) | JP3970966B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006182962A (en) * | 2004-12-28 | 2006-07-13 | Daicel Chem Ind Ltd | Additive for soil-pressed shield process |
| JP5537038B2 (en) * | 2008-06-16 | 2014-07-02 | 大成建設株式会社 | Additives and mud pressure shield method and mud pressure propulsion method using this additive |
| CN109054842B (en) * | 2018-08-01 | 2020-11-13 | 中铁四局集团有限公司 | Foaming agent for improving muck of earth pressure balance shield and preparation method thereof |
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1997
- 1997-02-03 JP JP2026897A patent/JP3970966B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JPH10219238A (en) | 1998-08-18 |
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