JP5063863B2 - Treatment method of construction waste mud generated by bubble shield method - Google Patents
Treatment method of construction waste mud generated by bubble shield method Download PDFInfo
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Description
本発明は気泡シールド工法で発生する建設排泥の処理方法に関する。 The present invention relates to a method for treating construction waste mud generated by a bubble shield method.
加泥材を切羽やチャンバ内に注入して切羽の安定を図る泥土圧シールド工法を改良した
気泡シールド工法が実用化されている。この気泡シールド工法は、起泡剤を主原料として
気泡生成装置が気泡を生成し、当該気泡を切羽やチャンバ内に注入しながら掘進作業を進
める工法である。
A bubble shield method has been put into practical use, which is an improvement of the mud pressure shield method that stabilizes the face by pouring mud material into the face or chamber. This bubble shield method is a method in which a bubble generating device generates bubbles using a foaming agent as a main raw material, and advances the excavation work while injecting the bubbles into a face or a chamber.
気泡シールド工法は、１．砂礫地盤の場合、気泡のベアリング効果によって掘削土の流
動性が高まる、２．気泡には圧縮性があるため、切羽圧の変動を少なくする、３．土粒子
の間隙に存在する地下水が微細な気泡と置換することで、掘削土の止水性が高まる、４．
粘土やベントナイトを使用しないため、坑内を汚さず、作業環境が向上する、５．注入設
備や気泡生成装置が小規模で済む、等の優れた特徴がある。
The bubble shield method is as follows. In the case of gravel ground, the fluidity of the excavated soil is increased by the effect of air bearings. 2. Since bubbles are compressible, reduce fluctuations in face pressure. 3. Water resistance of excavated soil is increased by substituting fine bubbles for groundwater present in the gaps between soil particles.
4. Since clay and bentonite are not used, the working environment is improved without polluting the mine. It has excellent features such as small injection equipment and bubble generation devices.
一方、気泡シールド工法からは、安定した気泡を含む排泥土である建設排泥が発生する
。
このような建設排泥は流動性に優れているところから、トラック等で運搬することが困難
となるため、通常固化処理された後、埋立てに供されたり、更に処理を加えてレンガ等の
建設・土木資材として再利用されたりする。
On the other hand, from the bubble shield method, construction waste mud, which is waste mud containing stable air bubbles, is generated.
Since such construction waste mud is excellent in fluidity, it is difficult to transport it with a truck, etc., so it is usually solidified and then used for landfill or after further processing such as bricks. It is reused as construction and civil engineering materials.
気泡シールド工法から発生した建設排泥の場合、このような処理を行うには、前記の気
泡を十分に消泡しないと、固化処理排泥が軽石状となって土木・建設資材として必要な十
分な強度（コーン指数）を示さなくなる。
In the case of construction waste mud generated from the bubble shield method, in order to carry out such treatment, if the bubbles are not sufficiently defoamed, the solidification waste mud becomes pumice and is sufficient for civil engineering and construction materials. No strong strength (cone index).
この現象を防ぐ為に多量の固化材を添加すると、コーン指数は高くなるが、塑性状態と
なり、粘性が高くなって機器等に付着しやすくなる。加えて貯留槽等ですぐに圧密化して
しまい、作業性が悪くなる。
When a large amount of a solidifying material is added to prevent this phenomenon, the cone index is increased, but it becomes a plastic state and becomes viscous and easily adheres to equipment. In addition, it is immediately consolidated in a storage tank and the workability is deteriorated.
このため、この排泥は先ず自然放置や消泡剤の添加により、消泡されていた。しかし、
消泡しても、汚泥中にシルトやセルロース系増粘剤を含む場合が多く、該成分の生成する
強固な泥膜は気泡の離脱を妨害する上に脱泡残留物においてもなお流動性を有する。
For this reason, this waste mud was first defoamed by natural standing or addition of an antifoaming agent. But,
Even after defoaming, the sludge often contains silt or a cellulose-based thickener, and the strong mud film formed by this component prevents the separation of bubbles and still has fluidity in the defoamed residue. Have.
この問題を解決するために、特公平７−５３２８０号公報には、特定のカチオン当量を
有するカチオン性高分子凝集剤を気泡シールド工法から発生する排泥に混錬し、流動性を
消失させる処理法が提案されている。この際、石灰やセメント等の無機系固化材を添加混
合することもできる旨記載されている。
しかしながら、上記従来法においては、排泥の流動性は消失するものの、通常の土状態に
戻るだけなので、固化処理を行っても、固化物が塊状となり、それを運搬するには、更に
砕く工程を要する等の新たな課題が発生するうえ、得られた固化物を、例えば、都市等の
舗装材料等の建設・土木資材として使用すると、排泥の処理に用いられた残留カチオン性
高分子凝集剤が雨水等によって地下水等に溶出し、環境汚染を引き起こす可能性があった
。
However, in the above conventional method, although the fluidity of the waste mud disappears, it only returns to the normal soil state. Therefore, even if the solidification treatment is performed, the solidified product becomes a lump and is further crushed to transport it. If the obtained solidified product is used as construction / civil engineering materials such as pavement materials in cities, etc., residual cationic polymer agglomerates used in the treatment of waste mud are generated. The agent could be eluted into the groundwater by rainwater, etc., causing environmental pollution.
本発明は、上記従来の問題点を解決し、気泡シールド工法から発生する建設排泥の運搬
性を改善し、かつ得られた固化物を再利用しても、環境汚染を引き起こす可能性がない処
理方法を提供するものである。
The present invention solves the above-mentioned conventional problems, improves the transportability of construction waste mud generated from the bubble shield method, and does not cause environmental pollution even if the obtained solidified material is reused. A processing method is provided.
本発明は、気泡シールド工法で発生する建設排泥に、カチオン性高分子凝集剤を添加することなく、アニオン性高分子凝集剤を添加混合し、造粒した後、無機系固化材を添加混合して固化することを特徴とする気泡シールド工法で発生する建設排泥の処理方法に関する。
The present invention adds and mixes an anionic polymer flocculant without adding a cationic polymer flocculant to the construction sludge generated by the bubble shield method, and then adds and mixes an inorganic solidifying material. It is related with the processing method of the construction waste mud generated by the bubble shield method characterized by solidifying.
本発明においては、無機系固化材としては、カルシウムまたはマグネシウムの酸化物を含む粉末を使用することが好ましい。固化物を建設・土木資材として使用するのであれば、無機系固化材としては、ｐＨが中性域の固化処理排泥が得られるように、石膏を用いることが好ましい。
In the present invention, it is preferable to use a powder containing an oxide of calcium or magnesium as the inorganic solidifying material . If you are using the solid product as the construction and civil engineering materials, as the inorganic solidifying material, so that pH is obtained solidification discharge mud neutral range, it is preferable to use a gypsum.
本発明の気泡シールド工法で発生する建設排泥の処理方法によれば、建設排泥を施工性
の優れた十分な強度を有する粒状固化物とすることができ、運搬性が格段に向上するうえ
、かくして得られた該固化物を建設・土木資材として、都市等における舗装材料や埋立材
料等に使用しても、環境を汚染する心配はなく、有効活用することが可能となる。
According to the method of treating construction waste mud generated by the bubble shield method of the present invention, the construction waste mud can be made into a granular solid having excellent workability and sufficient strength, and the transportability is greatly improved. Even if the solidified material thus obtained is used as a construction / civil engineering material for pavement or landfill materials in cities, etc., there is no concern of polluting the environment and it can be used effectively.
以下に本発明の気泡シールド工法で発生する建設排泥の処理方法に関し、その実施の形
態を詳細に説明する。
Hereinafter, embodiments of the present invention will be described in detail with regard to a method for treating construction mud generated by the bubble shield method of the present invention.
本発明の対象となる建設排泥は、気泡剤を含む気泡シールド工法で発生する建設排泥で
ある。
Construction waste mud that is an object of the present invention is construction waste mud generated by a bubble shield method containing a foaming agent.
本発明で用いられるアニオン性高分子凝集剤としては、ポリアクリルアミドの部分加水分解物、ポリアクリル酸、アクリル酸とアクリルアミドとの共重合体、アクリルアミドと２−アクリルアミドアルキルスルホン酸の共重合体等の合成高分子凝集剤が挙げられる。
Examples of the anionic polymer flocculant used in the present invention include polyacrylamide partial hydrolyzate, polyacrylic acid, a copolymer of acrylic acid and acrylamide, and a copolymer of acrylamide and 2-acrylamidoalkylsulfonic acid. Examples include synthetic polymer flocculants.
前記アニオン性高分子凝集剤のアニオン化率は３〜１００モル％程度であり、分子量は
１００万以上のものが好ましい。
The anionic polymer flocculant has an anionization rate of about 3 to 100 mol% and a molecular weight of preferably 1,000,000 or more.
これら合成高分子凝集剤の添加量は、建設汚泥に対して０．００５〜０．５重量％程度とする。
The addition amount of the synthetic polymer flocculant is about 0.005 to 0.5 wt% with respect to construction sludge.
添加混合方法としては、連続ミキサー、強制攪拌ミキサー等の混錬機やパワーショベ
ル、バックホウ、スックリューコンベア等の土木機械を用いることができる。
As the addition and mixing method, a kneader such as a continuous mixer or a forced stirring mixer, or a civil engineering machine such as a power shovel, a backhoe, or a screw conveyor can be used.
本発明の場合、アニオン性高分子凝集剤を使用することで、混合時に粒状となり、同時
に造粒される。
In the case of the present invention, by using an anionic polymer flocculant, it is granulated at the time of mixing and granulated at the same time.
建設排泥に前記高分子凝集剤や天然高分子を添加混合して混錬、造粒した後、無機系固
化材を添加する。
The polymer flocculant and natural polymer are added to the construction waste mud, kneaded and granulated, and then an inorganic solidifying material is added.
無機系固化材としては、セメント、生石灰、酸化マグネシウム等のアルカリ金属の酸化
物や石膏等を主成分として含む粉末が挙げられる。
Examples of the inorganic solidifying material include powders containing, as a main component, oxides of alkali metals such as cement, quicklime, and magnesium oxide, and gypsum.
特に、都市部等における舗装材料等の建設・土木材料として使用する場合には、固化処
理土のｐＨが中性に維持されるように石膏、特に半水石膏を使用することが好ましい。
In particular, when used as a construction / civil engineering material such as a pavement material in an urban area or the like, it is preferable to use gypsum, particularly hemihydrate gypsum so that the pH of the solidified soil is maintained neutral.
前工程で造粒された建設排泥にこれら無機系固化材を添加、混合する方法としては、前
記バックホウ等の他、２軸式パドルミキサー、ドラムミキサー、ロータリーミキサー等を
使用することができる。
As a method for adding and mixing these inorganic solidification materials to the construction waste mud granulated in the previous step, a biaxial paddle mixer, a drum mixer, a rotary mixer, etc. can be used in addition to the backhoe.
無機系固化材の添加量は、建設汚泥１ｍ３に対して２０〜２００ｋｇ程度、好ましくは
、５０〜１００ｋｇ程度とする。添加後、３０〜６０秒後に所定の効果が現れるが、３０
分以上放置して十分化学反応を起こさせることが好ましい。
The amount of the inorganic solidifying material added is about 20 to 200 kg, preferably about 50 to 100 kg, per 1 m3 of construction sludge. After the addition, a predetermined effect appears 30 to 60 seconds later.
It is preferable to leave it for more than a minute to cause a sufficient chemical reaction.
本発明の場合、これら建設排泥は造粒状態で固化されるため、貯留槽等に静置しても、
塊状となることはなく、粒状状態を保った形で固化される。
In the case of the present invention, these construction waste mud is solidified in a granulated state, so even if left in a storage tank or the like,
It does not become a lump but solidifies in a granular state.
本発明で得られる固化物は、コーン指数として１００kN/m2以上、特に石膏を使用した
場合には６００kN/m2以上の十分な強度を得ることができる。
The solidified product obtained by the present invention can obtain a sufficient strength of 100 kN / m 2 or more as a cone index, particularly 600 kN / m 2 or more when gypsum is used.
こうして得られた固化物は十分な強度を有する粒状物となっているため、トラック等に
よる運搬が極めて容易となり、そのまま埋め立て用資材として使用しても良いし、また、
その後成分を調整し、焼成して煉瓦等の建設用資材として有効活用しても良い。
Since the solidified product thus obtained is a granular material having sufficient strength, transportation by a truck or the like becomes extremely easy, and it may be used as a material for landfill as it is,
Thereafter, the components may be adjusted and fired to be effectively used as construction materials such as bricks.
本発明においては、気泡シールド工法から発生する建設排泥にアニオン性高分子凝集剤
を添加すると、塑性流動性状態の排泥のコンシステンシーを改質し、気泡の効果を低減す
るとともに、造粒作用により、汚泥の自由水を土粒子に取り込み、見掛け上の含水比を低
下させる。その結果、排泥を固化に適した状態に改質し、かつ、無機系固化材の添加量を
低減する。
In the present invention, when an anionic polymer flocculant is added to the construction waste mud generated from the bubble shield method, the consistency of the plastic fluid waste mud is modified to reduce the effect of bubbles and granulation. Due to the action, the sludge free water is taken into the soil particles and the apparent water content ratio is lowered. As a result, the waste mud is modified to a state suitable for solidification, and the amount of inorganic solidification material added is reduced.
無機系固化材は、造粒された排泥の自由水の一部と化学的に反応し、排泥を固化する。 The inorganic solidification material chemically reacts with a part of the free water of the granulated waste mud to solidify the waste mud.
こうして生成された粒状固化物は十分な強度を有する粒状体となっているため、運搬性
に優れており、そのまま埋立用資材として使用することができるし、また、該固化物に、
必要に応じて粘土鉱物やアルカリ金属酸化物等を添加、成形後、焼成して煉瓦等の舗装材
料として使用することもできる。
Since the granular solid product thus produced is a granular body having sufficient strength, it is excellent in transportability, and can be used as a material for landfill as it is.
If necessary, clay minerals or alkali metal oxides can be added, molded, fired and used as a paving material such as brick.
特に、無機系固化材として、石膏を使用すると、固化処理土のｐＨが中性に維持される
ので、環境汚染の心配がなくなり、埋立や舗装材料等、再利用先の用途が広がる。
In particular, when gypsum is used as the inorganic solidifying material, the pH of the solidified soil is maintained at a neutral level, so there is no concern about environmental pollution, and the reuse destinations such as landfills and paving materials are expanded.
以下に実施例及び比較例を挙げて本発明をより具体的に説明するが、本発明はその要旨
を超えない限り、以下の実施例に限定されるものではない。
実施例１〜６、比較例１、２
某所で気泡シールド工法から発生した排泥（試料１，２）を用いて固化試験を実施した
。排泥の性状を表１に示す。なお、起泡剤としては、ＯＫ−１（第一化成産業(株)商品名）を用いた。
Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to the following examples as long as the gist thereof is not exceeded.
Examples 1 to 6, Comparative Examples 1 and 2
A solidification test was conducted using waste mud (samples 1 and 2) generated from the bubble shield method at a certain place. Table 1 shows the properties of the mud. In addition, OK-1 (Daiichi Kasei Sangyo Co., Ltd. trade name) was used as the foaming agent.
この排泥に、アクリルアミド部分加水分解物（分子量：１千万、アニオン性率：３０％
）を排泥１ｍ３に対して１ｋｇ添加し、強制攪拌ミキサーを用いて、混合攪拌し、造粒し
た。
To this waste mud, acrylamide partial hydrolyzate (molecular weight: 10 million, anionic ratio: 30%
) Was added to 1 m3 of waste mud, mixed and stirred using a forced stirring mixer, and granulated.
造粒後、表２に示す各種固化材を所定量添加し、固化を行った。結果を表2に示す。 After granulation, a predetermined amount of various solidifying materials shown in Table 2 was added and solidified. The results are shown in Table 2.
ここで、コーン指数は、ＪＩＳ Ａ１２１０「突硬めによる土の締固め試験方法」に
準拠して供試体を作成した後、固化材添加から５時間経過後に、ＪＩＳ Ａ１２１０「締
固めた土のコーン指数試験」に従い、測定した。
Here, the cone index is JIS A1210 “Cone index of compacted soil” after the specimen was prepared in accordance with JIS A1210 “Testing method for compaction of soil by bump hardening” and after 5 hours from the addition of the solidifying material. Measured according to “Test”.
表２から、本発明の実施例においては、コーン指数が１００kN/m2以上、特に石膏を用
いた場合には、６００kN/m2以上のコーン指数が得られており、十分な建設資材としての
強度を有することがわかる。
From Table 2, in the examples of the present invention, a corn index of 100 kN / m2 or more, especially when gypsum is used, a corn index of 600 kN / m2 or more is obtained, and sufficient strength as a construction material is obtained. You can see that
なお、スコップで得られた固化物をすくって容器に入れて見ると、簡単にすくえ、容器
に入れた後も、投入時の形をそのまま維持した。
In addition, when the solidified material obtained with the scoop was scooped and put in a container, it was easily scooped, and the shape at the time of charging was maintained as it was after being put in the container.
本発明は、気泡シールド工法で発生する建設排泥に、アニオン性高分子凝集剤または天
然高分子を添加混合し、造粒した後、無機系固化材を添加混合して固化するようにしたの
で、固化物を埋立や都市等における舗装材料等の建設・土木資材として再利用しても、十
分な強度を有し、かつ、汚染物質が溶出して地下水汚染を引き起こす心配もない。
In the present invention, an anionic polymer flocculant or a natural polymer is added to and mixed with the construction sludge generated by the bubble shield method, and after granulation, an inorganic solidifying material is added and mixed to solidify. Even if the solidified material is reused as construction or civil engineering materials such as landfills and paving materials in cities, etc., it has sufficient strength and there is no fear of causing contamination of groundwater by elution of pollutants.
Claims (3)
Construction waste mud generated in the bubble shield method, without addition of the cationic polymer flocculant was added and mixed anionic polymer flocculant, after granulation, are solidified by adding and mixing the inorganic solidifying material A method for treating construction waste mud generated by the bubble shield method.
The method for treating construction waste mud generated in the bubble shield method according to claim 1, wherein the inorganic solidifying material is a powder containing an oxide of calcium or magnesium.
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| JP2005083412A JP5063863B2 (en) | 2005-03-23 | 2005-03-23 | Treatment method of construction waste mud generated by bubble shield method |
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| JP5063863B2 true JP5063863B2 (en) | 2012-10-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6084745B1 (en) * | 2016-09-07 | 2017-02-22 | 太平洋セメント株式会社 | Disposal method of mud generated by muddy water type shield method |
| JP6356933B1 (en) * | 2018-04-09 | 2018-07-11 | 太平洋セメント株式会社 | Disposal method of mud generated by muddy water type shield method |
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|---|---|---|---|---|
| JP5969099B1 (en) * | 2015-09-07 | 2016-08-10 | 太平洋セメント株式会社 | Treatment method of mud generated by bubble shield method |
| JP6713354B2 (en) * | 2016-06-17 | 2020-06-24 | 太平洋セメント株式会社 | Method of treating mud generated by shield method |
| JP6009118B1 (en) * | 2016-07-29 | 2016-10-19 | 太平洋セメント株式会社 | Treatment method of mud generated by bubble shield method |
| JP6830632B2 (en) * | 2018-02-20 | 2021-02-17 | 株式会社大林組 | Treatment method of mud generated by mud pressure shield method |
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| JP2002147171A (en) * | 2000-11-10 | 2002-05-22 | Toda Constr Co Ltd | Improving method for excavated material |
| JP2002282894A (en) * | 2001-03-27 | 2002-10-02 | Asahi Organic Chem Ind Co Ltd | Agent and method for solidifying sludge |
| JP2002336671A (en) * | 2001-05-17 | 2002-11-26 | Hitachi Constr Mach Co Ltd | Apparatus for granulating muddy soil |
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| JP6084745B1 (en) * | 2016-09-07 | 2017-02-22 | 太平洋セメント株式会社 | Disposal method of mud generated by muddy water type shield method |
| JP6356933B1 (en) * | 2018-04-09 | 2018-07-11 | 太平洋セメント株式会社 | Disposal method of mud generated by muddy water type shield method |
| JP2019181366A (en) * | 2018-04-09 | 2019-10-24 | 太平洋セメント株式会社 | Method for treating mud generated in slurry type shield construction method |
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