JPH10219238A - Additive for soil pressure type shield method - Google Patents
Additive for soil pressure type shield methodInfo
- Publication number
- JPH10219238A JPH10219238A JP2026897A JP2026897A JPH10219238A JP H10219238 A JPH10219238 A JP H10219238A JP 2026897 A JP2026897 A JP 2026897A JP 2026897 A JP2026897 A JP 2026897A JP H10219238 A JPH10219238 A JP H10219238A
- Authority
- JP
- Japan
- Prior art keywords
- aqueous solution
- additive
- polyacrylamide
- cmc
- sand
- 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.)
- Granted
Links
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【０００１】[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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an earth pressure shielding method additive. More specifically, an earth pressure-based shield method additive capable of imparting water retention and fluidity such as being pumpable while providing good water excavation by providing water stopping and lubricating properties by adding to excavated earth and sand, and The present invention relates to an earth pressure shielding method using this additive.
【０００２】[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。2. Description of the Related Art In the earth pressure shield method, excavation and earth removal were possible on soft ground such as silt and clay. Since the inside cannot be filled, a cavity is formed at the top of the cutter chamber. This cavity has a problem that soil and sand fall along with spring water, and as a result, the stability of the face cannot be maintained. In addition, excavation and earth removal are generally performed on sand and gravel ground by hand-digging shields and mechanical shields. In addition, since sand and gravel are not discharged by pumping, they are transported by belt conveyor or minecart, which is not preferable from the economical point of view and work efficiency.
【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７−８
２５５９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。Conventionally, an earth pressure system obtained by mixing one or more water-soluble polymers such as sodium polyacrylate, polyacrylamide, sodium carboxymethylcellulose, sodium alginate, PVA, starch and clay with water. Mud material for shield method and earth pressure system propulsion method (Japanese Unexamined Patent Publication No. 7-8
No. 2559) has been proposed, but the additive according to this technique uses clay, which is environmentally problematic. In other words, since clay is used, it is impossible to discard excavated earth and sand as ordinary soil, and it is treated as industrial waste, which is economically inefficient. In addition, this additive has some effects on the fluidity and water stoppage of excavated earth and sand in the gravel ground, but does not show a sufficiently satisfactory effect on pumping.
【０００４】[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。When excavation is carried out by excavating a conventional bentonite aqueous solution from the tip of the face when excavating in the gravel ground by the earth pressure shield method, the face becomes unstable, and There is a limit to the water stoppage and lubricity of the excavated earth and sand in the chamber. On the other hand, a method of adding clay to the above water-soluble polymer (Japanese Patent Application Laid-Open No. 7-82559)
When excavation is performed by excavation, the excavated sediment exhibits a certain degree of fluidity and water stoppage, but shows only insufficient fluidity to carry out fluid transport of excavated sediment in the chamber by pipes. In other words, the above-mentioned method of adding clay to a water-soluble polymer has a problem in that the pipe transportation of excavated sediment on the gravel ground has not yet been established, although the economics and workability of pipe transportation have great merit. Remaining. Also, because of the use of clay, the excavated soil becomes industrial waste,
Environmental issues remain.
【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ＣＭ
Ｃ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。[0005] It is also known to add an aqueous solution of sodium carboxymethylcellulose to excavated sand and gravel. Sodium carboxymethylcellulose (CM
C) is a highly stable substance generally used as a thickener and registered as a food additive. However, excavated sand and gravel to which the CMC aqueous solution has been added causes breathing, and stable excavation and fluid transport by pipes are impossible.
【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。The present invention solves the above-mentioned drawbacks of the additives according to the prior art, and enables stable excavation in sandy gravel ground and discharge of excavated sediment by pipes. The purpose is to provide an earth pressure shielding method additive that does not need to be treated as waste.
【０００７】[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０７−２８
４８００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。Means for Solving the Problems As a result of intensive studies, the present inventors have found that an earth-pressure-based shielding method additive that enables stable excavation of a face of a shield machine and enables pipe discharging to be carried out. The present inventors have found that it can be obtained by a mixture of CMC and polyacrylamide partially modified to sodium polyacrylate by hydrolysis in the presence of caustic soda, and have completed the present invention. That is, the present invention comprises a mixture of sodium carboxymethylcellulose having a viscosity of 1% aqueous solution (25 ° C., type B viscometer) of 4000 to 12000 cps and polyacrylamide partially modified to sodium polyacrylate by hydrolysis in the presence of caustic soda. The present invention relates to an earth-pressure-based shield method additive. According to the present invention, there was a limit because bleeding occurred only with CMC, but by combining polyacrylamide used as a polymer flocculant with CMC, stable excavation of the face of the shield machine was achieved. A method of processing the remaining soil by enabling pipe transport of the soil removal (Japanese Patent Laid-Open No. 07-28)
No. 4800), and an earth pressure-based shielding method additive is provided in which the use of clay does not require the use of clay so that earth removal is not treated as industrial waste.
【０００８】[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。DETAILED DESCRIPTION OF THE INVENTION As described above, the earth pressure-based shielding additive of the present invention comprises a mixture of sodium carboxymethylcellulose (CMC) and polyacrylamide partially modified to sodium polyacrylate by hydrolysis in the presence of sodium hydroxide. However, the CMC used in the present invention is desirably a highly viscous product for the purpose of preventing the excavated earth and sand from being breathed. Specifically, the viscosity of a 1% aqueous solution of CMC (25%
C., B type viscometer) is preferably 4000 to 12000 cps, and more preferably 8000 to 12000 cps. Further, DS (substitution ratio per glucose) = 0.7 to 1.2 is desirable. 1% aqueous solution viscosity
If it is less than 4000 cps, bleeding is likely to occur when transporting excavated soil and pipes, which is not preferable. Although high viscosity CMC is desirable, in practice, CMC having a viscosity higher than 12000 cps cannot be obtained.
【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。[0009] Polyacrylamide used in the earth pressure shielding 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 bleeding of excavated earth and sand. Specifically, 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,
Those having a molecular weight of 8 to 17 million are desirable. Furthermore, the polyacrylamide used in the present invention is partially modified to sodium polyacrylate in the presence of caustic soda, and its hydrolysis degree is suitably 20 to 40%.
【００１０】本発明の土圧系シールド工法添加剤は、Ｃ
ＭＣ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。[0010] The earth-pressure-based shielding method additive of the present invention comprises C
Mixing the weight ratio of MC and polyacrylamide in the range of 50/50 to 90/10 is necessary in terms of water stoppage and lubricity to realize good excavation, and water retention and fluidity to realize good pumping. Desirable. More preferably, the weight ratio of CMC to polyacrylamide is in the range of 60/40 to 80/20.
【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。The earth pressure-based shielding method additive of the present invention is used after being appropriately diluted with tap water or the like to a suitable concentration in accordance with the target earth and sand. The CMC and the polyacrylamide may be used as an aqueous solution after mixing solid materials, or the aqueous solutions may be mixed together, or one of the aqueous solutions may be mixed with the other solid. .
【００１２】[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。The present invention will be described below with reference to examples and comparative examples, but the present invention is not limited to these examples.
【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。Examples 1 to 5 A 1% aqueous solution having a viscosity of 9930 cps (25 ° C., B-type viscometer No. 4)
Rotor, 60 rpm), DS = 0.76 CMC [CMC Daicel <2280>, manufactured by Daicel Chemical Industries, Ltd.]
Also, 0.1% aqueous solution viscosity was 305 cps (25 ° C., B-type viscometer No. 2 rotor, 60 rpm) and polyacrylamide [Acofloc A130, Mitsui Cytec Co., Ltd.] having a hydrolysis degree of 30% was used. CMC / polyacrylamide = 50/50, 60/40, 70/30, 80/20, 90/10
(Weight ratio), tap water was used to prepare a 0.6% by weight aqueous solution. This aqueous solution is used for Kinugawa-produced river sand (water content
Against 14.0%) 3000cm 3, 600cm 3 was added and mixed,
The excavated soil was adjusted. The excavated soil was very viscous, fluid and water-blocking, with a slump value of 17.5-23.0 cm. In Examples 2, 3, and 4, no material was separated, and in Examples 1 and 5, the material was slightly separated. However, it was determined that pumping was possible.
【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、 60
0ｃｍ3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17.5ｃ
ｍ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。Example 6 The viscosity of a 1% aqueous solution was 5060 cps (25 ° C., B-type viscometer No. 4).
Using a CMC [CMC Daicel <2260>, manufactured by Daicel Chemical Industries, Ltd.] with a rotor, 60 rpm) and DS = 0.89,
A 0.1% aqueous solution of 305 cps (25 ° C., B-type viscometer No. 2 rotor, 60 rpm) and a polyacrylamide [Acofloc A130, Mitsui Cytec Co., Ltd.] having a hydrolysis degree of 30% were used. Was set to CMC / polyacrylamide = 70/30 (weight ratio), and a 0.6% by weight aqueous solution was prepared using tap water. This aqueous solution is applied to 3000cm 3 of Kinugawa sand (14.0% water content)
The excavated earth and sand was adjusted by adding and mixing 0 cm 3 . This excavated soil is viscous, fluid and water-blocking, with a slump value of 17.5 c
m. In addition, although the material was slightly separated, it was determined that pumping was possible.
【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％）3000
ｃｍ3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。Comparative Example 1 The viscosity of a 1% aqueous solution was 9930 cps (25 ° C., B-type viscometer No. 4
Using only CMC [CMC Daicel <2280>, manufactured by Daicel Chemical Industries, Ltd.] with a rotor of 60 rpm and DS = 0.76, a 0.6% by weight aqueous solution was prepared using tap water. This aqueous solution is used for Kinugawa-produced river sand (water content 14.0%) 3000
The excavated soil was adjusted by adding and mixing 600 cm 3 with respect to 3 cm 3 . The excavated soil was dry, lacking fluidity, slump value was 13.0cm, the material was separated, and water floated on the upper part of the container, so it could be judged that pumping was impossible.
【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。Comparative Examples 2 and 31 The viscosity of a 31% aqueous solution was 9930 cps (25 ° C., B-type viscometer No. 4).
Rotor, 60 rpm), DS = 0.76 CMC [CMC Daicel <2280>, manufactured by Daicel Chemical Industries, Ltd.]
Also, 0.1% aqueous solution viscosity was 305 cps (25 ° C., B-type viscometer No. 2 rotor, 60 rpm) and polyacrylamide [Acofloc A130, Mitsui Cytec Co., Ltd.] having a hydrolysis degree of 30% was used. By weight ratio of CMC /
Polyacrylamide was set to 95/5 (Comparative Example 2) and 40/60 (Comparative Example 3), and a 0.6% by weight aqueous solution was prepared using tap water. This aqueous solution was mixed with Kinugawa-produced river sand (water content 14.
(0%) With respect to 3000 cm 3 , 600 cm 3 was added and mixed to prepare excavated earth and sand. The excavated earth and sand of Comparative Example 2 has a slump value.
At 14.0 cm, the water blocking property was poor, the material was separated, and the water floated on the upper part of the container, and it was judged that pumping was impossible. The excavated earth and sand of Comparative Example 3 had a slump value of 25.0 cm, lacked water stopping properties, was slightly separated from materials, and was not in a state where pumping could be satisfactorily performed.
【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、600
ｃｍ3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。Comparative Example 4 The viscosity of a 1% aqueous solution was 3100 cps (25 ° C., B-type viscometer No. 4
Using a CMC [rotor, 60 rpm), DS = 0.63 [CMC Daicel <2100>, manufactured by Daicel Chemical Industries, Ltd.]
Also, 0.1% aqueous solution viscosity was 305 cps (25 ° C., B-type viscometer No. 2 rotor, 60 rpm) and polyacrylamide [Acofloc A130, Mitsui Cytec Co., Ltd.] having a hydrolysis degree of 30% was used. Was set to CMC / polyacrylamide = 70/30 (weight ratio), and a 0.6% by weight aqueous solution was prepared using tap water. The aqueous solution against Kinugawa production river sand (water content 14.0%) 3000cm 3, 600
The excavated soil was adjusted by adding and mixing cm 3 . This excavated earth and sand was not viscous and cohesive, lacked fluidity, and had a slump value of 12.0 cm. Also, the material is separated,
Water was floating at the top of the container, and it was determined that pumping was impossible.
【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、600
ｃｍ3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。Comparative Example 5 A 1% aqueous solution having a viscosity of 9930 cps (25 ° C., B-type viscometer No. 4
Rotor, 60 rpm), DS = 0.76 CMC [CMC Daicel <2280>, manufactured by Daicel Chemical Industries, Ltd.]
A 0.1% aqueous solution of 200 cps (25 ° C., B-type viscometer No. 2 rotor, 60 rpm) and a 15% hydrolysis degree polyacrylamide [Acofloc A100, Mitsui Cytec Co., Ltd.] were used. Was set to CMC / polyacrylamide = 70/30 (weight ratio), and a 0.6% by weight aqueous solution was prepared using tap water. The aqueous solution against Kinugawa production river sand (water content 14.0%) 3000cm 3, 600
The excavated soil was adjusted by adding and mixing cm 3 . The slump value of this excavated earth and sand was 13.0 cm, the materials were separated, and it was determined that pumping was impossible.
【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。Comparative Example 6 The viscosity of a 1% aqueous solution was 9930 cps (25 ° C., B-type viscometer No. 4
Rotor, 60 rpm), CMC with DS = 0.76 [CMC Daicel <2280>, manufactured by Daicel Chemical Industries, Ltd.] and sodium polyacrylate [Aqualic MHS, Nippon Shokubai Co., Ltd.]
Made] and clay [TB-300, manufactured by Tachibana Materials Co., Ltd.]
The mixing ratio of each was adjusted to CMC / sodium polyacrylate / clay = 15/15/70 (weight ratio) to prepare a 2% aqueous solution thereof. This aqueous solution is applied to Kinugawa-produced river sand (water content 14.0
%) To 3000 cm 3 , 600 cm 3 was added and mixed to adjust the excavated earth and sand. This excavated earth and sand lacked waterproofness and had a slump value of 16.0 cm. In addition, the material was slightly separated, and a little water was floating on the upper part of the container, and the pumping was not in a satisfactory state.
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【表２】 [Table 2]
【００２２】（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。(Note 1) The material non-separability is not separated (◎), slightly separated (○), slightly separated (△), and separated (×).
【００２３】[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。The additive of the earth pressure shield method of the present invention is as follows.
Since it is composed of specific two components without containing viscosity and has excellent fluidity and water stoppage of excavated earth and sand, it stabilizes the face of the shield machine and enables excavation of gravel ground. In addition, excavated soil treatment does not add clay, so excavated earth and sand is not treated as industrial waste, and pumping with good economy and workability can be performed instead of transporting conventional belt conveyors and trucks. I do.
Claims (4)
000〜12000ｃｐｓ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。1. The viscosity of a 1% aqueous solution (25 ° C., B-type viscometer) is 4
An earth pressure shielding method additive comprising a mixture of sodium carboxymethylcellulose of 000 to 12000 cps and polyacrylamide partially modified to sodium polyacrylate by hydrolysis in the presence of sodium hydroxide.
の加水分解により20〜40％ポリアクリル酸ソーダに変性
したものである請求項１記載の土圧系シールド工法添加
剤。2. The additive according to claim 1, wherein the polyacrylamide is modified into 20-40% sodium polyacrylate by hydrolysis in the presence of sodium hydroxide.
ポリアクリルアミドの重量比が、50／50〜90／10である
請求項１又は２記載の土圧系シールド工法添加剤。3. The additive according to claim 1, wherein the weight ratio of sodium carboxymethylcellulose to polyacrylamide is 50/50 to 90/10.
土圧系シールド工法添加剤を使用して、掘削土砂をポン
プ圧送することを特徴とする土圧系シールド工法。4. An earth pressure shield method comprising pumping excavated earth and sand using the earth pressure shield method additive according to any one of claims 1 to 3.
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 true JPH10219238A (en) | 1998-08-18 |
| JP3970966B2 JP3970966B2 (en) | 2007-09-05 |
Family
ID=12022452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2026897A Expired - Lifetime JP3970966B2 (en) | 1997-02-03 | 1997-02-03 | Earth pressure shield method additive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3970966B2 (en) |
Cited By (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 |
| JP2010024432A (en) * | 2008-06-16 | 2010-02-04 | Taisei Corp | Additive, and soil-pressed shield method and soil-pressed pipe-jacking method using the same |
| CN109054842A (en) * | 2018-08-01 | 2018-12-21 | 中铁四局集团有限公司 | A kind of earth pressure balanced shield, EPBS sediment improvement foaming agent and preparation method thereof |
-
1997
- 1997-02-03 JP JP2026897A patent/JP3970966B2/en not_active Expired - Lifetime
Cited By (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 |
| JP2010024432A (en) * | 2008-06-16 | 2010-02-04 | Taisei Corp | Additive, and soil-pressed shield method and soil-pressed pipe-jacking method using the same |
| CN109054842A (en) * | 2018-08-01 | 2018-12-21 | 中铁四局集团有限公司 | A kind of earth pressure balanced shield, EPBS sediment improvement foaming agent and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3970966B2 (en) | 2007-09-05 |
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