JPH086350B2 - Transportation method of wet soil - Google Patents

Transportation method of wet soil

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Publication number
JPH086350B2
JPH086350B2 JP63190282A JP19028288A JPH086350B2 JP H086350 B2 JPH086350 B2 JP H086350B2 JP 63190282 A JP63190282 A JP 63190282A JP 19028288 A JP19028288 A JP 19028288A JP H086350 B2 JPH086350 B2 JP H086350B2
Authority
JP
Japan
Prior art keywords
water
soil
polymer compound
soluble
absorbent resin
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.)
Expired - Fee Related
Application number
JP63190282A
Other languages
Japanese (ja)
Other versions
JPH0238615A (en
Inventor
貢 福田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kurita Water Industries Ltd
Original Assignee
Kurita Water Industries Ltd
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Filing date
Publication date
Application filed by Kurita Water Industries Ltd filed Critical Kurita Water Industries Ltd
Priority to JP63190282A priority Critical patent/JPH086350B2/en
Publication of JPH0238615A publication Critical patent/JPH0238615A/en
Publication of JPH086350B2 publication Critical patent/JPH086350B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】 〔産業上の利用分野) 本発明は改質剤を用いて含水排土を改質して運搬する
方法に関し、さらに詳しくは水不溶性の吸水性樹脂と水
溶性高分子化合物とを添加することにより含水排土を改
質して運搬する方法に関するものである。
Description: TECHNICAL FIELD The present invention relates to a method for modifying and transporting water-containing waste soil using a modifier, and more specifically, a water-insoluble water-absorbent resin and a water-soluble polymer. The present invention relates to a method for modifying and transporting hydrous soil by adding a compound.

〔従来の技術〕 泥土加圧シールド、泥シールド、地下連続壁、基礎杭
などの建設工事において排出される堀削土には、高含水
率の軟弱排土があり、そのままではダンプトラックによ
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。
[Prior art] The excavated soil discharged during construction work such as mud pressure shield, mud shield, underground continuous wall, foundation pile, etc. has soft excavation with high water content, and it can be transported by a dump truck as it is. Since it is difficult, it is carried out after being modified by adding a modifier.

含水率が高くそのままでは通常のダンプトラックによ
る運搬が困難な含水排土の改質方法としては、従来から
生石灰、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)なとが知られている。
As a method of reforming water-containing soil that has a high water content and is difficult to transport by a normal dump truck as it is, inorganic materials such as quick lime and cement have been used for 30 to 100 kg / m 3
In addition to soil removal at the rate of soil, a method of improving transportability by utilizing these hydraulic properties (for example, JP-A-61-216994) and water absorption represented by cross-linked sodium polyacrylate insoluble in water It is known that the resin is modified by adding 1 to 10 kg / m 3 · soil (for example, JP-A-58-27780).

一方、スラリーの凝結方法として、アクリルアミド系
高分子化学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
せて凝結を行う方法(例えば特公昭56−35959号)が知
られている。
On the other hand, as a method of condensing a slurry, a method of adding powder of an acrylamide polymer chemical to the slurry, transferring the slurry in a fluid state, and dissolving the powdered polymer compound during the transfer to condense (for example, Japanese Patent Publication No. 56-35959) is known.

しかし、上記の生石灰やセメントなどを使用する改質
方法には次のような問題点がある。
However, the above-mentioned reforming method using quicklime or cement has the following problems.

改良効果が小さく、固結しない。 The improvement effect is small and does not solidify.

改質土のpHが強アルカリ性になる。 The pH of the modified soil becomes strongly alkaline.

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。
Since the reaction time extends to several days, a vast area is required for the treatment, and it is not possible to expect reforming at the discharge site in construction in urban areas where soil disposal is a particular problem.

薬剤の使用量が多い。 A large amount of drug is used.

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。
Further, the method using the water absorbent resin has the following problems.

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った場合
など、塩類濃度が高い地盤では著しく効果が落ちる。
The effect of reforming is insufficient, and especially in the vicinity of the coast, or when the ground is improved with water glass in advance, the effect is remarkably reduced in the ground with a high salt concentration.

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。
The reaction time is not as long as in the case of quicklime, cement, etc., but it is still long and about 30 minutes is required.

このような吸水性樹脂の挙動の原因としては、吸水性
樹脂を含水排土中に添加すると、含水排土中の自由水を
吸水しようとするが、自由水とともに土粒子も引きつけ
られ、これにより瞬時にして吸水性樹脂の表面が目詰ま
りを起こした状態になり、それ以上の吸水は進まなくな
って十分な効果を発揮し得ないためであると推測され
る。
As a cause of such a behavior of the water-absorbent resin, when the water-absorbent resin is added to the soil containing water, it tries to absorb free water in the soil containing water, but the soil particles are also attracted together with the free water. It is speculated that this is because the surface of the water-absorbent resin is instantly in a clogged state, and further water absorption does not proceed so that the sufficient effect cannot be exhibited.

〔発明が解決しようとする課題〕[Problems to be Solved by the Invention]

本発明の目的は、上記問題点を解決するため、含水率
が広範囲の含水排土に適用可能で、短時間に改質でき、
しかも改質された被処理土に振動を加えても元の性状に
戻らない含水排土の運搬方法を提案することである。
The object of the present invention is to solve the above problems, the water content is applicable to a wide range of water-containing soil discharge, can be modified in a short time,
Moreover, it is to propose a method for carrying water-containing waste soil that does not return to its original state even if vibration is applied to the modified soil to be treated.

〔課題を解決するための手段〕[Means for solving the problem]

本発明は、含水排土に水不溶性の吸水性樹脂と水溶性
高分子化合物とを添加して改質し、運搬することを特徴
とする含水排土の運搬方法である。
The present invention is a method for transporting water-containing soil, comprising adding a water-insoluble water-absorbent resin and a water-soluble polymer compound to the water-containing soil for modification and transportation.

本発明で対象となる含水排土は、前記例示のような建
設工事等において排出される堀削土等の高含水率の排土
等であり、土質、含水率などは特に制限されないが、含
水率は約20〜85重量%程度のものが好適な対象となる。
The water-containing soil discharged in the present invention is a high water-content soil-discharging material such as excavated soil discharged in the construction work as described above, and the soil quality and water content are not particularly limited. A suitable rate is about 20 to 85% by weight.

本発明で用いる水不溶性の吸水性樹脂(以下、単に吸
水性樹脂という)としては、水不溶性であって吸水性を
有する樹脂であればよく、例えばポリビニリアルコー
ル、ポリエチレンオキシド、ポリアクリル酸ナトリウ
ム、ポリアクリルアミド、ポリスチレンスルホン酸ナト
リウム、ポリビニルピロリドン等の架橋体、澱粉−アク
リロニトリル、澱粉−メタクリレートグラフト共重合
物、ポリアクリロニトリル、およびビニルエステル−エ
チレン系不飽和カルボン酸共重合体の部分加水分解物な
どがあげられるが、架橋率または部分加水分解率などは
特に制限されず、使用時の混合に耐えられるものであれ
ばよい。
The water-insoluble water-absorbent resin used in the present invention (hereinafter, simply referred to as water-absorbent resin) may be a water-insoluble and water-absorbent resin, for example, polyvinyl alcohol, polyethylene oxide, sodium polyacrylate. , Crosslinked products of polyacrylamide, sodium polystyrene sulfonate, polyvinylpyrrolidone, etc., starch-acrylonitrile, starch-methacrylate graft copolymers, polyacrylonitrile, and partial hydrolysates of vinyl ester-ethylenically unsaturated carboxylic acid copolymers, etc. The crosslinking rate or the partial hydrolysis rate is not particularly limited as long as it can withstand mixing during use.

またこれらの吸水性樹脂は粉末で使用することがで
き、その粒度は特に限定されないが、排土中での吸水効
果を向上させるために、10メッシュ以下にして使用する
のが好ましくは、これらは単独で、または2種以上を混
合して使用することができる。
Further, these water-absorbent resins can be used in powder, the particle size is not particularly limited, in order to improve the water-absorbing effect in soil removal, it is preferable to use 10 mesh or less, these are They can be used alone or in combination of two or more.

本発明では上記吸水性樹脂の他にさらに吸水効果を向
上させるため、水溶性高分子化合物を併用する。このよ
うな水溶性高分子化合物としては、水溶性カチオン性高
分子化合物および水溶性アニオン性高分子化合物を好ま
しい。
In the present invention, a water-soluble polymer compound is used together with the above water-absorbent resin in order to further improve the water-absorbing effect. As such a water-soluble polymer compound, a water-soluble cationic polymer compound and a water-soluble anionic polymer compound are preferable.

水溶性カチオン性高分子化合物としては、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、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があげられ、
これらは単独で、または2種以上を混合して使用するこ
とができる。
Examples of the water-soluble cationic polymer compound include homopolymers of aminoalkyl (meth) acrylates, copolymers with acrylamide or other monomers, Hoffman degradation products of polyacrylamide, polyamide polyamines, polyvinyl imidazoline polyethylene imine, poly Examples include dialkyl diallyl ammonium salts,
These may be used alone or in admixture of two or more.

水溶性アニオン性高分子化合物としては、例えばポリ
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)含有
高分子化合物、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)含有高分子化合物、さら
にアクリル酸(またはその塩)とアクリルアミドと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)との三元共重合体等のカルボン酸(またはそ
の塩)およびスルホン酸(またはその塩)含有高分子化
合物などがあげられ、これらは単独で、または2種以上
を混合して使用することができる。
Examples of the water-soluble anionic polymer compound include carboxylic acids (or salts thereof) such as polyacrylic acid (or a salt thereof), polyacrylamide partial hydrolyzate, and a copolymer of acrylamide and acrylic acid (or a salt thereof). Containing polymer compound, polyvinyl sulfonic acid (or salt thereof), polymer compound containing sulfonic acid (or salt thereof) such as copolymer of acrylamide and 2-acrylamido-2-methylpropane sulfonic acid (or salt thereof), Furthermore, acrylic acid (or its salt), acrylamide, and 2-
Examples include carboxylic acid (or its salt) such as terpolymer with acrylamido-2-methylpropane sulfonic acid (or its salt) and polymer compound containing sulfonic acid (or its salt), which are used alone. Or, two or more kinds can be mixed and used.

さらに水溶性カチオン性高分子化合物および水溶性ア
ニオン性高分子化合物を混合して使用するのが好まし
く、この場合水溶性カチオン性高分子化合物と水溶性ア
ニオン性高分子化合物を重量比で2:1〜1:3に混合して使
用するのが好ましい。これらの水溶性高分子化合物は、
粉末で使用することができ、その粒度は特に限定されな
いが、排土中で吸水効果を向上させるために、10メッシ
ュ以下にして使用するのが好ましい。
Further, it is preferable to use a mixture of a water-soluble cationic polymer compound and a water-soluble anionic polymer compound, in which case the water-soluble cationic polymer compound and the water-soluble anionic polymer compound are used in a weight ratio of 2: 1. It is preferable to use a mixture of ˜1: 3. These water-soluble polymer compounds,
It can be used as a powder, and its particle size is not particularly limited, but it is preferable to use it with 10 mesh or less in order to improve the water absorption effect in soil removal.

さらに、使用する水溶性高分子化合物の重合度に関し
てもとくに限定はないが、いわゆる高分子の物性を表わ
す一つの指標である固有粘度で、水溶性カチオン性高分
子化合物は、3.0dl/g以上、水溶性アニオン性高分子化
合物は6.0dl/g以上であれば良く、就中カチオンは4.5dl
/g以上、アニオンは10.0dl/g以上が好適である。
Further, the degree of polymerization of the water-soluble polymer compound to be used is not particularly limited, however, the intrinsic viscosity is one index showing the physical properties of the polymer, and the water-soluble cationic polymer compound is 3.0 dl / g or more. The water-soluble anionic polymer compound should be 6.0 dl / g or more, and the cation should be 4.5 dl / g.
/ g or more, and the anion is preferably 10.0 dl / g or more.

本発明の含水排土の運搬方法は、吸水性樹脂および水
溶性高分子化合物を重量比4:1〜1:4、好ましくは2:1〜
1:1で別々に分けて、または予め一部または全部を混合
して含水排土に添加し、混合撹拌して含水排土を改善
し、運搬する。このときの添加量は排土の土質、含水率
によって異なるが、両者の合量で含水排土1m3当り約0.2
〜20kg、好ましくは約1〜8kg程度である。このとき0.2
kgより少なければ添加による効果が得られず、20kgより
多くなると経済的に不利になる。
The method of carrying water-containing soil according to the present invention comprises a water absorbent resin and a water-soluble polymer compound in a weight ratio of 4: 1 to 1: 4, preferably 2: 1 to.
Separately by 1: 1 or add a part or all of them in advance to the hydrated soil and mix and stir to improve the hydrated soil for transportation. The amount added at this time depends on the soil quality and the water content of the soil discharged, but the total amount of both is about 0.2 per 1 m 3 of the water discharged soil.
It is about 20 kg, preferably about 1-8 kg. At this time 0.2
If it is less than 20 kg, the effect of the addition cannot be obtained, and if it exceeds 20 kg, it is economically disadvantageous.

上記吸水性樹脂および水溶性高分子化合物を含水排土
に添加して混合すると、含水排土は吸水性樹脂および水
溶性高分子化合物に自由水を吸水されて、ゲル状になっ
て凝集し、全体が固化してパラパラの状態に改質され
る。これにより含水排土は3〜10分程度の短時間で改質
され、建設現場内での含水排土の処理が可能となり、そ
のままダンプトラックやベルトコンベア等に積込んで運
搬することができるようになる。これは水溶性高分子化
合物の凝集作用により、含水排土内の土粒子が凝集して
土粒子内の自由水がはき出され、吸水し易い状態になる
とともに、土粒子間に水道(ミズミチ)ができて、自由
水のみが移動できる状態となるため、吸水性樹脂および
水溶性高分子化合物が目詰まりを起こすことなく、その
能力一杯まで吸水できることになり、結果として短時間
に良好な改質効果が得られるためであると推測される。
When the water-absorbent resin and the water-soluble polymer compound are added to and mixed with the water-containing soil, the water-containing soil is absorbed into the water-absorbent resin and the water-soluble polymer compound as free water, and becomes a gel and aggregates. The whole is solidified and reformed into a fluffy state. As a result, the water-containing soil is reformed in a short time of about 3 to 10 minutes, and it becomes possible to treat the water-containing soil on the construction site, and it can be loaded as it is on a dump truck or belt conveyor and transported. become. This is because the coagulation action of the water-soluble polymer compound causes the soil particles in the water-containing soil to aggregate and the free water in the soil particles to be expelled, making it easier to absorb water and creating a water supply (mizumichi) between the soil particles. As a result, only free water can move, so the water absorbent resin and water-soluble polymer compound can absorb water to the full capacity without causing clogging, and as a result, a good reforming effect in a short time. It is presumed that this is because

〔発明の効果〕〔The invention's effect〕

本発明の方法によれば、含水排土に吸水性樹脂および
水溶性高分子化合物を添加して改質し、運搬するように
したので、含水率が広範囲に及ぶ含水排土に対して短時
間で改質処理することができ、しかも改質された被処理
土に振動を加えても元の性状に戻らないため、含水排土
を効率よく運搬することができるなどの効果が得られ
る。
According to the method of the present invention, a water-absorbent resin and a water-soluble polymer compound are added to the hydrated soil for modification so that the hydrated soil can be transported. It is possible to carry out the reforming treatment with, and since the reformed treated soil does not return to its original state even if the treated soil is vibrated, it is possible to efficiently convey the hydrated soil.

〔実施例〕〔Example〕

以下、本発明の実施例について説明する。 Examples of the present invention will be described below.

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(日本純一土質分類、CH) ii)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
取した。
1) Test conditions i) Type of sample Soil removal at shield construction site (sampling location: Kawasaki City) Soil type, silt (Junichi soil classification of Japan, CH) ii) Sample amount 400 ml Actually measure the unit volume weight in advance Every time, it was collected by weight.

iii)試料の含水率 65% iv)撹拌時間 実施例は4〜6分間、比較例は20〜30分間 v)使用吸水性樹脂 ポリアクリル酸ナトリウ架橋体 vi)使用水溶性高分子化合物 a)水溶性カチオン性高分子化合物(以下、カチオンと
いう。) 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8,000,000) b)水溶性アニオン性高分子化合物(以下、アニオンと
いう。) ポリアクリルアミドの部分加水分解物(推定分子量1
2,000,000) 実施例1〜10、比較例1〜11 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、
吸水性樹脂および水溶性高分子化合物を表1および表2
に示した量を添加してスパーテルで撹拌した。このとき
改質過程に要する時間を計測した。なお改質過程は、具
体的には流動性がなくなって次第に塊状となり、最後に
この塊が砕けてパラパラの状態を経る。次に改質土の硬
さをみる目的でJIS R5201「モルタルの物理試験方法」
に従ってフロー試験を行った。フロー試験においては単
にフロー値を求めるだけでなく、フローコーンに充填す
るときの状態、およびそのときに浸出してくる浸出水量
も併せて測定した。
iii) Water content of sample 65% iv) Stirring time 4 to 6 minutes in Examples, 20 to 30 minutes in Comparative Examples v) Water-absorbent resin used Crosslinked poly (acrylic acid) sodium vi) Water-soluble polymer compound used a) Water-soluble Cationic polymer compound (hereinafter referred to as cation) Methyl chloride of dimethylaminomethacrylate (estimated molecular weight 8,000,000) b) Water-soluble anionic polymer compound (hereinafter referred to as anion) Partial hydrolyzate of polyacrylamide (estimated) Molecular weight 1
2,000,000) Examples 1 to 10 and Comparative Examples 1 to 11 2) Test method 400 ml of a sample was placed in a polyethylene beaker of 1,
The water-absorbent resin and the water-soluble polymer compound are shown in Table 1 and Table 2.
The amount shown in was added and stirred with a spatula. At this time, the time required for the reforming process was measured. In the reforming process, specifically, the fluidity is lost, and the lump gradually becomes a lump, and finally the lump is crushed and goes through a state of fluffiness. Next, for the purpose of checking the hardness of the modified soil, JIS R5201 “Physical test method for mortar”
The flow test was performed according to. In the flow test, not only the flow value was obtained, but also the state when the flow cone was filled and the amount of leachate leached at that time were also measured.

なお、浸出水量はフローコーンに充填したとき、突き
固めによりフローコーンの底部から浸出した水を、フロ
ーテーブルを傾けて容器に集めて計量した。これらの結
果をまとめて表1および表2に示す。
When the flow cone was filled with water, the amount of water leached was measured by collecting the water leached from the bottom of the flow cone by compaction in a container with the flow table tilted. These results are summarized in Table 1 and Table 2.

表1および表2より明らかなように、実施例ではすべ
て4〜5.5分間で改質が終了して固結しているが、比較
例では20〜30分経過しても改質できず固結しない(比較
例1〜8)、または改質が終了して固結したが、浸出水
が実施例より多い(比較例9〜11)ため十分な改質がで
きなかった。
As is clear from Table 1 and Table 2, in all of the examples, the modification was completed and solidified in 4 to 5.5 minutes, but in the comparative example, the modification could not be completed even after 20 to 30 minutes and solidified. No (Comparative Examples 1 to 8) or solidification was achieved after reforming, but sufficient reforming could not be performed because there was more leachate than in the Examples (Comparative Examples 9 to 11).

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】含水排土に水不溶性の吸水性樹脂と水溶性
高分子化合物とを添加して改質し、運搬することを特徴
とする含水排土の運搬方法。
1. A method for transporting water-containing soil, comprising adding a water-insoluble water-absorbent resin and a water-soluble polymer compound to the water-containing soil for modification and transporting.
【請求項2】水溶性高分子化合物が水溶性カチオン性高
分子化合物または(および)水溶性アニオン性高分子化
合物であることを特徴とする請求項第1項記載の含水排
土の運搬方法。
2. The method for transporting hydrated soil according to claim 1, wherein the water-soluble polymer compound is a water-soluble cationic polymer compound and / or a water-soluble anionic polymer compound.
JP63190282A 1988-07-29 1988-07-29 Transportation method of wet soil Expired - Fee Related JPH086350B2 (en)

Priority Applications (1)

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JP63190282A JPH086350B2 (en) 1988-07-29 1988-07-29 Transportation method of wet soil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63190282A JPH086350B2 (en) 1988-07-29 1988-07-29 Transportation method of wet soil

Publications (2)

Publication Number Publication Date
JPH0238615A JPH0238615A (en) 1990-02-08
JPH086350B2 true JPH086350B2 (en) 1996-01-24

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Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008108079A1 (en) * 2007-03-02 2008-09-12 Railway Technical Research Institute Analytical sample drying method and drying apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05239848A (en) * 1992-02-27 1993-09-17 Ohbayashi Corp Force feed system of soil and sand
JP4619837B2 (en) * 2005-03-14 2011-01-26 電気化学工業株式会社 Solidified material, solidified body using the same, and soil improvement method
CN108086300A (en) * 2017-12-27 2018-05-29 河海大学 The method that the direct shearing intensity of soil is improved using graphene

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5953119B2 (en) * 1977-02-15 1984-12-22 日本セメント株式会社 Sludge treatment agent
JPS54117144A (en) * 1978-03-03 1979-09-11 Nippon Solid Co Ltd Preparing method of minute flock and its disposal method
JPS54120907A (en) * 1978-03-13 1979-09-19 Nippon Solid Co Ltd Method of improving soft ground
JPS58187485A (en) * 1982-04-28 1983-11-01 Kajima Corp Method for improving earth and sand

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008108079A1 (en) * 2007-03-02 2008-09-12 Railway Technical Research Institute Analytical sample drying method and drying apparatus
JPWO2008108079A1 (en) * 2007-03-02 2010-06-10 財団法人鉄道総合技術研究所 Analysis sample drying processing method and drying processing apparatus
US8001854B2 (en) 2007-03-02 2011-08-23 Railway Technical Research Institute Analytical sample drying method and drying apparatus

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