JPH0568598B2 - - Google Patents
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- Publication number
- JPH0568598B2 JPH0568598B2 JP62315716A JP31571687A JPH0568598B2 JP H0568598 B2 JPH0568598 B2 JP H0568598B2 JP 62315716 A JP62315716 A JP 62315716A JP 31571687 A JP31571687 A JP 31571687A JP H0568598 B2 JPH0568598 B2 JP H0568598B2
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- polymer compound
- soil
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- 239000002689 soil Substances 0.000 claims description 58
- 150000001875 compounds Chemical class 0.000 claims description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 229920006317 cationic polymer Polymers 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 14
- 229920006318 anionic polymer Polymers 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 description 12
- 150000003839 salts Chemical class 0.000 description 10
- 238000007596 consolidation process Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000002002 slurry Substances 0.000 description 8
- 239000007787 solid Substances 0.000 description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- 239000003607 modifier Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 238000005345 coagulation Methods 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 125000002091 cationic group Chemical group 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 229940079593 drug Drugs 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920001059 synthetic polymer Polymers 0.000 description 2
- 229920003169 water-soluble polymer Polymers 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 description 1
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 235000006506 Brasenia schreberi Nutrition 0.000 description 1
- 244000267222 Brasenia schreberi Species 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920002873 Polyethylenimine Polymers 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 125000004103 aminoalkyl group Chemical group 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- OWMBTIRJFMGPAC-UHFFFAOYSA-N dimethylamino 2-methylprop-2-enoate Chemical compound CN(C)OC(=O)C(C)=C OWMBTIRJFMGPAC-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229940050176 methyl chloride Drugs 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、建設工事において排出される高含
水率の軟弱排土（以下単に、軟弱土という場合が
ある）を固結して運搬する方法に関するものであ
る。
〔従来の技術〕
泥土加圧シールド、泥水シールド、地下連続
壁、基礎杭などの建設工事において排出される掘
削土には、高含水率の軟弱排土があり、そのまま
ではダンプトラツクによる運搬が困難であるた
め、改質剤の添加により改質して運搬することが
行われている。
含水率が高くそのままでは通常のダンプトラツ
クによる運搬が困難な軟弱排土の改質方法として
は、従来から生石炭、セメントなどの無機系の素
材を30〜100Kg／m3・土の割合で排土に加え、こ
れらの水硬性を利用して運搬性を改良する方法
（例えば特開昭61−216994号）や、水に不溶性の
架橋ポリアクリル酸ナトリウムに代表される吸水
性樹脂を１〜10Kg／m3・土添加して改質する方法
（例えば特開昭58−27780号）などが知られてい
る。
一方、スラリーの凝結方法として、アクリルア
ミド系高分子化合物の粉末をスラリーに添加し
て、流動状態でスラリーを移送し、移送中に粉末
高分子化合物を溶解させせ凝結を行う方法（例え
ば特公昭56−35959号）が知られている。
〔発明が解決しようとする問題点〕
しかし、上記の生石灰やセメントなどを使用す
る固結方法には次のような問題点がある。
改質効果が小さく、固結しない。
改質土のPHが強アルカリ性になる。
反応時間が数日にも及ぶため、処理に広大な
場所を必要とし、排土処理がとくに問題となる
都市部の工事において排出現場での改質が望め
ない。
薬剤の使用量が多い。
また、吸水性樹脂を用いる方法には次のような
問題点がある。
改質効果が不十分であり、とくに海岸の近く
の場合、あるいは予め水ガラスなどで地盤改良
を行つた場合など、塩類濃度が高い地盤では著
しく効果が落ちる。
反応時間が前記の生石灰、セメントなどの場
合ほどではないが、やはり長く、30分程度は必
要である。
改質土を野積みにした場合、保水力があるた
めにいつまでも乾燥しない。また、乾燥したと
しても一度降雨に会えば再度吸水し、この繰返
しのため、いつまでもジメジメしている。
さらにアクリルアミド系高分子化合物によるス
ラリーの凝結方法は、パイプ中を移送するスラリ
ーを対象とするため、凝結には固液分離が必要で
あり、分離した固形分は本発明が対象とする軟弱
土よりはるかに軟弱であるため、そのまま静置す
れば長時間後に固結するが、分離直後にダンプト
ラツクによる運搬はできず、運搬には脱水等のさ
らに別の処理を必要とする。
この発明の目的は、上記問題点を解決するた
め、少ない改質剤の添加量で短時間に軟弱土を固
結することができ、広い範囲の含水率の軟弱土に
も適用可能で、改質効果が高い軟弱土の固結運搬
方法を提案することである。
〔問題点を解決するための手段〕
この発明は、建設工事において排出される軟弱
排土に、水溶性のカチオン性高分子化合物または
水溶性のカチオン性高分子化合物と水溶性のアニ
オン性高分子化合物を、軟弱排土１m3当り0.2〜
20Kgの割合で、粉末の状態で添加して、前記軟弱
排土中の自由水を吸水させるとともに、粘着性を
付与することにより、前記軟弱排土を凝集物の間
隙中に自由水を抱え込んだ状態で固結した後運搬
することを特徴とする軟弱排土の固結運搬方法で
ある。
この発明において処理の対象となる軟弱土は、
前記例示のような建設工事において排出される掘
削土等の高含水率の排土等であり、含水率は約20
〜85重量％程度のもの、特に含水率50〜85重量％
のものが好適な対象となる。
この発明で改質剤として用いる水溶性のカチオ
ン性高分子化合物としては制限はないが、例えば
アミノアルキル（メタ）アクリレートの単独重合
体またはアクリルアミドもしくは他のモノマーと
の共重合体、ポリアクリルアミドのホフマン分解
物およびマンニツヒ変性物、ポリアミドポリアミ
ン、ポリビニルイミダゾリン、ポリエチレンイミ
ン、ポリジアルキルジアリルアンモニウム塩など
の合成高分子化合物が好ましい。これらの水溶性
のカチオン性高分子化合物は１種単独で、または
２種以上混合して使用することができる。
本発明では改質剤として水溶性のカチオン性高
分子化合物の粉末のみを使用してもよいが、水溶
性のカチオン性高分子化合物との粉末と水溶性の
アニオン性高分子化合物と粉末との配合剤を使用
するのが好ましい。
使用可能な水溶性のアニオン性高分子化合物と
しては制限はないが、例えば次のような合成高分
子化合物が好ましい。
(1) ポリアクリル酸（またはその塩）、ポリアク
リルアミド部分加水分解物、アクリルアミドと
アクリル酸（またはその塩）との共重合体等の
カルボン酸（またはその塩）を有する高分子化
合物。
(2) ポリビニルスルホン酸（またはその塩）、ア
クリルアミドと２−アクリルアミド−２−メチ
ルプロパンスルホン酸（またはその塩）との共
重合体等のスルホン酸（またはその塩）を有す
る高分子化合物。
(3) アクリル酸（またはその塩）と２−アクリル
アミド−２−メチルプロパンスルホン酸（また
はその塩）とアクリルアミドとの三元共重合体
等のカルボン酸（またはその塩）とスルホン酸
（またはその塩）を有する高分子化合物。
カチオン性高分子化合物、アニオン性高分子化
合物の重合度に関してはとくに限定はないが、い
わゆる高分子特性を表わす一つの指標である固有
粘度が、カチオン性高分子化合物は3.0以上、ア
ニオン性高分子化合物は6.0以上であれば良く、
就中カチオン性高分子化合物は4.5以上、アニオ
ン性高分子化合物は10以上が好適である。
薬剤の粒度もとくに限定されるものではなく、
10メツシユ以下程度であれば目的を達する。
本発明では、上記のような水溶性のカチオン性
高分子化合物または水溶性のカチオン性高分子化
合物と水溶性のアニオン性高分子化合物の粉末を
軟弱土に添加し、固液分離を行うことなく軟弱土
を固結して、ベルトコンベア等による運搬を可能
とする。
固結方法は、カチオン性高分子化合物単独の場
合は粉末をそのまま、また配合剤の場合はカチオ
ン性高分子化合物とアニオン性高分子化合物とを
予めカチオン対アニオンの重量比で３：１〜１：
２、望ましくは２：１〜１：１の割合で配合した
ものを粉末状態で軟弱土に添加し、混合撹拌す
る。
添加量は土質、含水率等によつて異なるが、一
般的には軟弱土１m3当り0.2〜20Kg、望ましくは
0.5〜５Kgである。この値より少なければ効果が
悪くなり、多過ぎるのは効果的には問題ないが、
不経済である。
軟弱土に水溶性のカチオン性高分子化合物、ま
たは水溶性のカチオン性高分子化合物と水溶性の
アニオン性高分子化合物の粉末を添加して混合撹
拌すると、高分子化合物は軟弱土中の自由水を吸
水し、ゲル状になつて固形物を凝集させ、粘着性
を付与するため、凝集物の間隙中に自由水を抱え
込んだ状態で全体が固化する。このためスラリー
の場合のように固液分離を行わなくても、軟弱土
全体が固結し、そのままダンブトラツクやベルト
コンベア等の積込んで運搬することが可能であ
る。このような難弱土の固結は３〜10分程度の短
時間で終了するため、建設現場における処理も可
能である。
本発明における軟弱土の固結が従来の高分子化
合物によるスラリーの凝結と異なる点は、水分量
の差によるメカニズムの差にある。すなわち従来
のスラリーは本発明が対象とする軟弱土よりもは
るかに大量の95〜99重量％程度水分を含んだ懸濁
液であり、むしろ大量の水の中に少量の土壌固形
分が懸濁している状態である。これに粉末状の高
分子化合物を添加した場合、高分子化合物は移送
中に溶解して水溶液となつて固形分を凝集させる
ので、その後固液分離により水分を分離すること
により、濃縮された固形分が得られる。この固形
分はなお高含水率であるため、さらに脱水等の操
作が必用であり、そのままダンプトラツク等によ
る運搬はできない。
これに対して本発明における軟弱土の固結は、
前述のように水溶性の高分子化合物が軟弱土中の
自由水を吸水してゲル化することにより、軟弱土
中の自由水がなくなるとともに、固形分を凝集し
て粘着性を付与するもので、固液分離を行うこと
なく、全体が固結する。
また従来の石灰、セメント等による固結は、石
灰、セメント等の水硬性を利用するもので、吸
水、凝集を行う本発明のものとは相違する。さら
に従来の吸水性樹脂は吸水作用のみを行うもので
あり、本発明の吸水、凝集を行うものとは相違す
る。本発明では水溶性高分子化合物の吸水性、凝
集性および粘着性付与性を利用しているため、こ
れらの従来の方法よりも軟弱土の改質効果は大き
く、軟弱土を短時間で固結することができる。
水溶性のカチオン性高分子化合物またはカチオ
ン性とアニオン性の高分子化合物により軟弱土を
固結すると、アニオン性またはノニオン性高分子
化合物により処理する場合よりも、固結効果が優
れている。
〔発明の効果〕
本発明によれば、水溶性のカチオン性またはカ
チオン性とアニオン性高分子化合物の粉末を高含
水率の軟弱土に添加して、軟弱土中の自由水を吸
水させるとともに、粘着性を付与することによ
り、凝集物の間隙中に自由水を抱え込んだ状態で
固結して運搬するようにしたので、少ない薬剤添
加量で、短時間に軟弱土を固結して運搬すること
ができ、広い範囲の含水率の軟弱土にも適用で
き、改質効果が高く、建設現場における処理が可
能であるなどの効果がある。
〔実施例〕
以下、本発明の実施例について説明する。例
中、％は重量％を示す。
実施例の試験条件および試験方法は次の通りで
ある。
(1) 試験条件
(i) 試料の種類
シールド工事現場の排土（採取場所、川崎市）
土質；シルト（日本統一土質分類 CH）
(ii)試料の含水率
57％、66％、81.1％
(iii)試料のフロー値
含水率57％のとき 250×250
含水率66％のとき 300×300以上
含水率81.1％のとき 300×300以上
(iv)試料の量
400ml
実際には予め単位体積重量を測定しておき、重
量で採取。
(v)改質剤
水溶液のカチオン性高分子化合物(C)：ジメチル
アミノメタクリレートのメチルクロライド化物
（推定分子量8000000）
水溶性のアニオン性高分子化合物(A)：ポリアク
リルアミドの部分加水分解物（推定分子量
14000000）
水溶性のノニオン性高分子化合物(N)：ポリアク
リルアミド（推定分子量12000000）
(vi)撹拌時間
改質が早く完了する場合は３分間、最長で10分
間とする。
(2) 試験方法
試料400mlを１のポリエチレン製のビーカに
採り、薬剤を所定量添加して３〜10分間スパーテ
ルで撹拌した。固結が終了した時点でそれまでに
要した時間を記録し、また固結が終了しない場合
は10分間で打切り、直ちにJIS−R55201に定める
「モルタルの物理試験方法」に従つてフロー試験
を行つた。
対照とした吸水性樹脂、生石灰、セメントの従
来法も全く同様に実施した。
なお、フロー値が110×110以内であれば、実際
にダンプトラツクで運搬可能である。また、フロ
ー値が110×110〜120×120の範囲内ではどうにか
運搬可能であるが、120×120を超えると運搬は不
可能となる。
試験結果を表１に示す。
【表】[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for consolidating and transporting soft soil with a high moisture content (hereinafter simply referred to as soft soil) discharged during construction work. It is related to. [Conventional technology] Excavated soil discharged during construction works such as mud pressurized shields, mud water shields, underground continuous walls, and foundation piles contains soft soil with a high moisture content, making it difficult to transport by dump truck as it is. Therefore, it is being transported after being modified by adding a modifier. Conventional methods for improving soft soil that has a high moisture content and is difficult to transport using normal dump trucks have been to discharge raw coal, cement, and other inorganic materials at a rate of 30 to 100 kg/ m3 of soil. In addition to soil, there are methods to improve transportability by utilizing their hydraulic properties (for example, JP-A No. 61-216994), and water-absorbing resins such as cross-linked sodium polyacrylate, which are insoluble in water, can be used in amounts of 1 to 10 kg. /m 3 - A method of modifying by adding soil (for example, Japanese Patent Application Laid-Open No. 58-27780) is known. On the other hand, as a slurry coagulation method, powder of an acrylamide-based polymer compound is added to the slurry, the slurry is transferred in a fluid state, and the powdered polymer compound is dissolved during transfer to cause coagulation (for example, -35959) is known. [Problems to be Solved by the Invention] However, the above-mentioned consolidation method using quicklime, cement, etc. has the following problems. Modification effect is small and does not solidify. The pH of the amended soil becomes strongly alkaline. Since the reaction time is several days, a vast area is required for treatment, making it impossible to improve the soil at the site of construction in urban areas where disposal of waste soil is particularly problematic. The amount of drugs used is high. Furthermore, the method using a water-absorbing resin has the following problems. The reforming effect is insufficient, especially in ground with high salt concentration, such as near the coast or where the ground has been improved with water glass etc. Although the reaction time is not as long as in the case of quicklime and cement, it is still long and requires about 30 minutes. If modified soil is piled up in the open, it will not dry out forever because of its water-retaining ability. Furthermore, even if the land is dry, once it encounters rainfall, it will absorb water again, and because of this repetition, it will remain damp forever. Furthermore, since the slurry coagulation method using an acrylamide-based polymer compound targets the slurry being transferred through a pipe, solid-liquid separation is necessary for coagulation, and the separated solid content is better than the soft soil targeted by the present invention. Since it is much softer, it will solidify after a long time if left as is, but it cannot be transported by dump truck immediately after separation, and further processing such as dehydration is required for transportation. The purpose of this invention is to solve the above-mentioned problems by making it possible to consolidate soft soil in a short time with a small amount of modifier, and to be able to consolidate soft soil with a wide range of moisture content. The purpose of this study is to propose a method for compacting and transporting soft soil with high quality effects. [Means for Solving the Problems] The present invention provides a method for applying a water-soluble cationic polymer compound or a water-soluble cationic polymer compound and a water-soluble anionic polymer to soft earth discharged during construction work. Compound from 0.2 to 1m3 of soft soil
It was added in the form of powder at a rate of 20 kg to absorb the free water in the soft soil and give it adhesiveness, so that the free water was trapped in the gaps between the aggregates of the soft soil. This is a method of compacting and transporting soft excavated soil, which is characterized by transporting the soil after it has been compacted. The soft soil to be treated in this invention is
This is soil with a high moisture content, such as excavated soil discharged during construction work as shown in the example above, and the moisture content is approximately 20%.
~85% by weight, especially water content of 50-85% by weight
are suitable targets. The water-soluble cationic polymer compound used as a modifier in this invention is not limited, but examples include aminoalkyl (meth)acrylate homopolymers or copolymers with acrylamide or other monomers, and polyacrylamide Hoffmann. Synthetic polymer compounds such as decomposition products and Mannitz modified products, polyamide polyamines, polyvinylimidazolines, polyethyleneimines, and polydialkyldiallylammonium salts are preferred. These water-soluble cationic polymer compounds can be used alone or in combination of two or more. In the present invention, only a powder of a water-soluble cationic polymer compound may be used as a modifier, but a powder of a water-soluble cationic polymer compound and a powder of a water-soluble anionic polymer compound may be used as a modifier. Preference is given to using formulations. Although there are no restrictions on the water-soluble anionic polymer compound that can be used, for example, the following synthetic polymer compounds are preferred. (1) Polymer compounds containing carboxylic acids (or salts thereof) such as polyacrylic acid (or salts thereof), partially hydrolyzed polyacrylamide, and copolymers of acrylamide and acrylic acid (or salts thereof). (2) Polymer compounds containing sulfonic acid (or a salt thereof) such as polyvinylsulfonic acid (or a salt thereof) and a copolymer of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid (or a salt thereof). (3) Carboxylic acids (or salts thereof) and sulfonic acids (or A polymer compound with salt). There are no particular limitations on the degree of polymerization of cationic polymer compounds and anionic polymer compounds; The compound should be 6.0 or higher,
Among these, it is preferable that the number is 4.5 or more for cationic polymer compounds and 10 or more for anionic polymer compounds. The particle size of the drug is not particularly limited,
If it is less than 10 meters, the goal will be achieved. In the present invention, powders of a water-soluble cationic polymer compound or a water-soluble cationic polymer compound and a water-soluble anionic polymer compound as described above are added to soft soil, and the powder is added to soft soil without performing solid-liquid separation. Consolidates soft soil to enable transportation by belt conveyor, etc. In the case of a cationic polymer compound alone, the powder is used as it is, and in the case of a combination agent, the cationic polymer compound and anionic polymer compound are mixed in advance at a cation to anion weight ratio of 3:1 to 1. :
2. A mixture preferably blended in a ratio of 2:1 to 1:1 is added to soft soil in powder form, and mixed and stirred. The amount added varies depending on soil quality, moisture content, etc., but generally 0.2 to 20 kg per m3 of soft soil, preferably
It is 0.5 to 5 kg. If it is less than this value, the effect will be poor, and if it is too much, there is no problem with the effectiveness, but
It is uneconomical. When a water-soluble cationic polymer compound, or a powder of a water-soluble cationic polymer compound and a water-soluble anionic polymer compound is added to soft soil and mixed and stirred, the polymer compound converts into free water in the soft soil. It absorbs water, turns into a gel, aggregates the solids, and gives them stickiness, so the whole solidifies with free water trapped in the gaps between the aggregates. Therefore, the entire soft soil is consolidated without performing solid-liquid separation as in the case of slurry, and it is possible to load it onto a dump truck or belt conveyor and transport it as it is. Consolidation of such weak soil can be completed in a short time of about 3 to 10 minutes, so it can also be treated at a construction site. The difference between the consolidation of soft soil in the present invention and the consolidation of slurry using conventional polymer compounds lies in the difference in mechanism due to the difference in water content. In other words, conventional slurry is a suspension containing a much larger amount of water, about 95 to 99% by weight, than the soft soil that is the object of the present invention, but rather a small amount of soil solids suspended in a large amount of water. It is in a state of being When a powdered polymer compound is added to this, the polymer compound dissolves during transportation, becomes an aqueous solution, and aggregates the solid content.Then, water is separated by solid-liquid separation, resulting in a concentrated solid. You can get minutes. Since this solid content still has a high water content, further operations such as dehydration are required, and it cannot be transported as is by dump truck or the like. On the other hand, the consolidation of soft soil in the present invention is
As mentioned above, the water-soluble polymer compound absorbs free water in the soft soil and turns it into a gel, which eliminates the free water in the soft soil and aggregates the solid content, giving it stickiness. , the whole solidifies without performing solid-liquid separation. Further, conventional consolidation using lime, cement, etc. utilizes the hydraulic properties of lime, cement, etc., and is different from the method of the present invention, which absorbs water and coagulates. Further, the conventional water-absorbing resin only performs water-absorbing action, which is different from the water-absorbing and coagulating resin of the present invention. Since the present invention utilizes the water absorbing, cohesive, and tackifying properties of water-soluble polymer compounds, it has a greater effect on improving soft soil than these conventional methods, and can consolidate soft soil in a short time. can do. When soft soil is consolidated with a water-soluble cationic polymer compound or a cationic and anionic polymer compound, the consolidation effect is better than when treated with an anionic or nonionic polymer compound. [Effects of the Invention] According to the present invention, water-soluble cationic or cationic and anionic polymer compound powder is added to soft soil with a high water content to absorb free water in the soft soil, and By imparting adhesive properties, we have made it possible to consolidate and transport while holding free water in the gaps between the aggregates, allowing soft soil to be consolidated and transported in a short period of time with a small amount of chemical added. It can be applied to soft soil with a wide range of moisture content, has a high reforming effect, and can be treated at construction sites. [Examples] Examples of the present invention will be described below. In the examples, % indicates weight %. The test conditions and test methods of Examples are as follows. (1) Test conditions (i) Type of sample Excavated earth from shield construction site (sampling location, Kawasaki City) Soil quality: Silt (Japan unified soil classification CH) (ii) Moisture content of sample 57%, 66%, 81.1% ( iii) Sample flow value When moisture content is 57% 250 x 250 When moisture content is 66% 300 x 300 or more When moisture content is 81.1% 300 x 300 or more (iv) Sample amount 400ml Actually, the unit volume weight is calculated in advance Measure it and collect it by weight. (v) Modifier Aqueous cationic polymer compound (C): Methyl chloride of dimethylamino methacrylate (estimated molecular weight 8000000) Water-soluble anionic polymer compound (A): Partial hydrolyzate of polyacrylamide (estimated molecular weight
14000000) Water-soluble nonionic polymer compound (N): polyacrylamide (estimated molecular weight 12000000) (vi) Stirring time If the modification is completed quickly, the stirring time should be 3 minutes, or up to 10 minutes. (2) Test method A sample of 400 ml was placed in a polyethylene beaker (1), a predetermined amount of the drug was added, and the mixture was stirred with a spatula for 3 to 10 minutes. When consolidation is complete, record the time required, and if consolidation is not completed, stop after 10 minutes and immediately conduct a flow test in accordance with the "Physical Test Method for Mortar" specified in JIS-R55201. Ivy. Conventional methods using water-absorbing resin, quicklime, and cement as controls were conducted in exactly the same manner. Note that if the flow value is within 110 x 110, it can actually be transported by dump truck. Also, if the flow value is within the range of 110 x 110 to 120 x 120, transportation is possible, but if it exceeds 120 x 120, transportation is impossible. The test results are shown in Table 1. 【table】
Claims (1)
溶性のカチオン性高分子化合物または水溶性のカ
チオン性高分子化合物と水溶性のアニオン性高分
子化合物を、軟弱排土１m3当り0.2〜20Kgの割合
で、粉末の状態で添加して、前記軟弱排土中の自
由水を吸水させるとともに、粘着性を付与するこ
とにより、前記軟弱排土を凝集物の間〓中に自由
水を抱え込んだ状態で固結した後運搬することを
特徴とする軟弱排土の固結運搬方法。 ２ 難弱排土の含水率が約20〜85重量％である特
許請求の範囲第１項記載の軟弱排土の固結運搬方
法。 ３ 水溶性のカチオン性高分子化合物と水溶性の
アニオン性高分子化合物の重量比が３：１〜１：
２である特許請求の範囲第１項または第２項記載
の軟弱排土の固結運搬方法。[Scope of Claims] 1. A water-soluble cationic polymer compound or a water-soluble cationic polymer compound and a water-soluble anionic polymer compound are added to soft soil discharged during construction work for 1 m of soft soil. It is added in the form of powder at a ratio of 0.2 to 20 kg per 3 kg to absorb the free water in the soft soil and give it adhesiveness, so that the soft soil can be mixed between the aggregates. A method for solidifying and transporting soft soil, which is characterized by solidifying and transporting soil while retaining free water. 2. The method for consolidating and transporting weak excavated soil according to claim 1, wherein the moisture content of the weak excavated soil is approximately 20 to 85% by weight. 3 The weight ratio of the water-soluble cationic polymer compound and the water-soluble anionic polymer compound is 3:1 to 1:
2. A method for solidifying and transporting soft excavated soil according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31571687A JPH01158109A (en) | 1987-12-14 | 1987-12-14 | Solidification of soft soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31571687A JPH01158109A (en) | 1987-12-14 | 1987-12-14 | Solidification of soft soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01158109A JPH01158109A (en) | 1989-06-21 |
| JPH0568598B2 true JPH0568598B2 (en) | 1993-09-29 |
Family
ID=18068679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31571687A Granted JPH01158109A (en) | 1987-12-14 | 1987-12-14 | Solidification of soft soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01158109A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0691998B2 (en) * | 1989-01-24 | 1994-11-16 | ハイモ株式会社 | Treatment method for wet excavated soil |
| JPH11323335A (en) * | 1998-05-14 | 1999-11-26 | Nippon Shokubai Co Ltd | Conditioning process for water-containing soil |
| CN112159164B (en) * | 2020-10-16 | 2022-07-12 | 肇庆市武大环境技术研究院 | Soft soil curing agent and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54120907A (en) * | 1978-03-13 | 1979-09-19 | Nippon Solid Co Ltd | Method of improving soft ground |
| JPS62112654A (en) * | 1985-11-11 | 1987-05-23 | Kyoritsu Yuki Kogyo Kenkyusho:Kk | Highly water-absorbing resin composition |
-
1987
- 1987-12-14 JP JP31571687A patent/JPH01158109A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54120907A (en) * | 1978-03-13 | 1979-09-19 | Nippon Solid Co Ltd | Method of improving soft ground |
| JPS62112654A (en) * | 1985-11-11 | 1987-05-23 | Kyoritsu Yuki Kogyo Kenkyusho:Kk | Highly water-absorbing resin composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01158109A (en) | 1989-06-21 |
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