JP2008038358A - Disposal method for excavated sediment - Google Patents

Disposal method for excavated sediment Download PDF

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JP2008038358A
JP2008038358A JP2006210377A JP2006210377A JP2008038358A JP 2008038358 A JP2008038358 A JP 2008038358A JP 2006210377 A JP2006210377 A JP 2006210377A JP 2006210377 A JP2006210377 A JP 2006210377A JP 2008038358 A JP2008038358 A JP 2008038358A
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sand
earth
tunnel
excavated
mixer
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Ryoji Watabe
良治 渡部
Atsumasa Sato
敦政 佐藤
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AMUSU KK
WATARYO ENGINEERING KK
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AMUSU KK
WATARYO ENGINEERING KK
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Abstract

<P>PROBLEM TO BE SOLVED: To dispose of excavated sediment containing deleterious material without making it open to the air. <P>SOLUTION: This disposal method for excavated sediment includes: an excavating process of digging a tunnel 1 by an excavator 2; a discharge process including a loader 4, a first conveyer 3, a second conveyer 5, a third conveyer 8 and a carrier 7 for discharging the excavated sediment S from the tunnel 1; and a disposal process for mixing deleterious material processing agent T and the sediment S by a mixer 6 to disposal of the deleterious material of the excavated sediment S. In the disposal process, the mixer 6 is provided between the second conveyer 5 and the third conveyer 8 in the discharge process to thereby dispose of the deleterious material. The deleterious material processing agent T is mainly composed of unburnt peridotite. Thus, the deleterious material contained in the sediment S can be dissolved, made insoluble and purified in the tunnel 1, so that atmospheric release of the deleterious material to the outside of the tunnel 1 can be reduced as much as possible. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、トンネル等の掘削土砂類の処理方法に関するものである。   The present invention relates to a method for treating excavated earth and sand such as a tunnel.

従来、掘削機によって掘削された土砂類をトンネル後方に搬出する排出方法として、掘削機によってトンネルを掘削する場合、カッタ板により掘削した土砂類をカッタ板とその後方に設けている隔壁との間の土砂類取込室内に取り込んだのち、機内に配設しているスクリューコンベアによって土砂類取込室内の掘削土砂類を取り出し、トンネル内を走行するトロ台車に積載して搬送することが行われている（例えば特許文献１）。   Conventionally, when excavating a tunnel with an excavator as a discharging method for carrying out the earth and sand excavated by the excavator between the cutter plate and the partition wall provided behind the cutter plate, After being taken into the earth and sand taking-in chamber, the excavated earth and sand in the earth and sand taking-in chamber is taken out by a screw conveyor installed in the machine, and loaded on a Toro cart that runs in the tunnel. (For example, Patent Document 1).

ところで、トンネル掘削作業において、自然的に有害重金属を含む地盤に遭遇することがある。この重金属は先進ボーリング等の調査で予め掘削前に調査されている。このような地盤中の重金属は土壌汚染対策法に準じて処分を図ることが望ましいとされたことから、従来では掘削工程で掘削した重金属を含んだ土砂類を排出工程によりトンネル外に排出し、そしてトンネル外で前記有害物質を処理するために土砂類を処理していた。   By the way, in tunnel excavation work, the ground that naturally contains harmful heavy metals may be encountered. This heavy metal has been previously investigated prior to excavation by surveys such as advanced boring. Since it was desirable to dispose of such heavy metals in the ground in accordance with the Soil Contamination Countermeasures Law, conventionally, earth and sand containing heavy metals excavated in the excavation process is discharged out of the tunnel by the discharge process, And earth and sand were processed outside the tunnel in order to process the harmful substances.

そして、このような処理した土砂類は埋め戻しなどトンネル工事完成後に最終処分がなされる。
特開平７−８２９８９号公報 And, such treated earth and sand is finally disposed after tunnel construction such as backfilling.
Japanese Patent Laid-Open No. 7-82989

しかしながら、重金属を含んだ土砂類を排出工程によりトンネル外に排出し、そしてトンネル外でこれを処理しようとする場合、有害物質を含んだ土砂類は大気開放状態となって空気や水を汚染してしまうおそれがある。またトンネルの近くに土砂類の仮置き場所があって、該場所を処理場として土砂類を処理する場合にはそのようなおそれは比較的低くなるが、トンネル掘削場所は山間地などが多く、トンネル近くに土砂類の仮置き場所が得られることはまれである。   However, when earth and sand containing heavy metals are discharged out of the tunnel by the discharge process and are to be treated outside the tunnel, the earth and sand containing harmful substances are released into the atmosphere and contaminate air and water. There is a risk that. In addition, there is a temporary storage place for earth and sand near the tunnel, and when such land is used as a treatment plant, such a risk is relatively low. It is rare that a temporary storage place for earth and sand can be obtained nearby.

解決しようとする問題点は、有害物質が含まれている掘削された土砂類を大気開放状態にすることなく処理する掘削土砂類の処理方法を提供する点である。   The problem to be solved is to provide a method for treating excavated earth and sand that treats excavated earth and sand containing harmful substances without opening to the atmosphere.

請求項１の発明は、掘削箇所を掘削する掘削工程と、この掘削された土砂類を前記掘削箇所より排出する排出工程と、前記掘削された土砂類の有害物質を処理する処理工程を備えた掘削土砂類の排出において、前記処理工程を前記排出工程の途中に設けたことを特徴とする掘削土砂類の処理方法である。   The invention of claim 1 comprises an excavation step for excavating a excavation site, a discharge step for discharging the excavated earth and sand from the excavation site, and a treatment step for treating harmful substances in the excavated sediment. In the discharge of excavated earth and sand, the processing method for excavated earth and sand is provided in the middle of the discharge process.

請求項２の発明は、前記掘削箇所はトンネルなどの地下道であり、前記排出工程にミキサーを設けると共に、該ミキサーによって掘削土砂類と前記処理工程用の有害物質処理剤を混合することを特徴とする請求項１記載の掘削土砂類の処理方法である。   The invention of claim 2 is characterized in that the excavation site is an underground passage such as a tunnel, and a mixer is provided in the discharge process, and excavated earth and sand and a hazardous substance treating agent for the treatment process are mixed by the mixer. The method for treating excavated earth and sand according to claim 1.

請求項３の発明は、前記有害物質処理剤は、未焼成カンラン岩を主成分とする有害物質の分解・不溶化・浄化剤であって、有害重金属類、油類、揮発性有機化合物等の有害化学物質に汚染された土砂類の処理に適用されるものであることを特徴とする請求項１又は２記載の掘削土砂類の処理方法である。   According to a third aspect of the present invention, the hazardous substance treating agent is a decomposing / insolubilizing / purifying agent for harmful substances mainly composed of uncalcined peridotite, and harmful substances such as harmful heavy metals, oils, and volatile organic compounds. The method for treating excavated earth and sand according to claim 1 or 2, which is applied to the treatment of earth and sand contaminated with a chemical substance.

請求項１の発明によれば、掘削場所内で土砂類に含まれる湯外物質を処理でき、有害物質の掘削箇所の外への大気放出を可及的に低減することができ、さらに掘削箇所近くで処理用の土砂類の仮置き場所も不要となる。   According to the first aspect of the present invention, the hot water contained in the earth and sand can be treated in the excavation site, and the release of harmful substances to the outside of the excavation site can be reduced as much as possible. There is no need for a temporary storage place for earth and sand for treatment nearby.

請求項２の発明によれば、トンネル内で土砂類に含まれる湯外物質を処理でき、さらにトンネル近くで処理用の土砂類の仮置き場所も不要となる。   According to the second aspect of the present invention, it is possible to treat the hot water contained in the earth and sand in the tunnel, and further, no temporary place for the earth and sand for treatment is required near the tunnel.

請求項３の発明によれば、未焼成のカンラン岩を主成分として使用することで、有害物質を確実に処理することができる。   According to the invention of claim 3, harmful substances can be reliably treated by using unfired peridotite as a main component.

本発明における好適な実施の形態について、添付図面を参照して説明する。尚、以下に説明する実施の形態は、特許請求の範囲に記載された本発明の内容を限定するものではない。また、以下に説明される構成の全てが、本発明の必須要件であるとは限らない。   Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention.

図１は実施例１を示しており、掘削箇所である地下道としてのトンネル１の掘削は掘削孔の先端１Ａから入口１Ｂにかけて、掘削装置２、該掘削装置２によって掘削された土砂類Ｓを後述する第１のコンベア３へ積み込みする積み込み重機４、始端上方に集積用ホッパー３Ａを備えると共に終端下方に排出用ホッパー３Ｂを備えた前記第１のコンベア３、排出用ホッパー３Ｂ側を始端５Ａとし後述するミキサー６に終端５Ｂを接続するように設けられる第２のコンベア５、前記終端５Ｂに１次側６Ａが設けられる混合、混練手段たるミキサー６、ミキサー６の２次側６Ｂを始端８Ａとし後述するトラック等運搬車両７に終端８Ｂを接続するように設けられる第３のコンベア８が配置されている。そして、ミキサー６には水供給路９が接続している。またミキサー６には有害物質処理剤Ｔの供給路10が接続している。   FIG. 1 shows Example 1, and excavation of a tunnel 1 serving as an underground passage as an excavation site is performed from the tip 1A of the excavation hole to the entrance 1B. The loading conveyor 4 to be loaded on the first conveyor 3, the stacking hopper 3A above the starting end and the discharging hopper 3B below the end, and the discharging hopper 3B side as the starting end 5A will be described later. The second conveyor 5 provided to connect the end 5B to the mixer 6 to be mixed, the mixer 6 serving as the kneading means, the mixer 6 serving as the kneading means, and the secondary side 6B of the mixer 6 as the start end 8A. A third conveyor 8 provided so as to connect the terminal end 8B to the transporting vehicle 7 such as a truck is disposed. A water supply path 9 is connected to the mixer 6. In addition, a supply path 10 for the hazardous substance treating agent T is connected to the mixer 6.

有害物質処理剤Ｔは以下のようなものである。未焼成カンラン岩を主成分とする有害物質の分解、不要化・浄化剤であって、例えば（１）未焼成カンラン岩と軽焼マグネサイトを含み、未焼成カンラン岩と軽焼マグネサイトの成分の重量比が１：９９〜９９：１であるもの、（２）未焼成カンラン岩と軽焼ドロマイトを含み、未焼成カンラン岩と軽焼マグネサイトの成分の重量比が１：９９〜９９：１であるもの、（３）未焼成カンラン岩と溶性燐肥を含み、未焼成カンラン岩と溶性燐肥の成分の重量比が１：９９〜９９：１であるもの、（４）未焼成カンラン岩と焼成貝殻粉末を含み、未焼成カンラン岩と焼成貝殻粉末の成分の重量比が１：９９〜９９：１であるものなどが用いられる。さらに（４）前記（１）〜（３）の有害物質処理剤Ｔに、遠赤外線放射成分を混合してもよい。   The hazardous substance treating agent T is as follows. Decomposing, eliminating and purifying harmful substances mainly composed of unburned peridotite, including (1) components of unburned peridotite and light-burned magnesite, including unburned peridotite and light-burned magnesite (2) Including unburned peridotite and lightly burned dolomite, the weight ratio of unburned peridotite and lightly burnt magnesite is 1:99 to 99: 1, (3) including unburned peridotite and soluble phosphate, and having a weight ratio of the unburned peridotite to soluble phosphate fertilizer being 1:99 to 99: 1, (4) unburned peridotite A material containing rock and fired shell powder and having a weight ratio of unburned peridotite to fired shell powder of 1:99 to 99: 1 is used. Further, (4) a far-infrared radiation component may be mixed with the hazardous substance treating agent T of (1) to (3).

火成岩の一種であるカンラン岩は、マグネシウムや鉄分を多量に含む天然の無機性鉱物であり、これに有害物質の種類に応じて軽焼マグネサイト、軽焼ドロマイト、溶性燐肥、焼成貝殻粉末を混合、添加することにより、有害物質処理剤Ｔとしての効率を高め、分離、分解と同時に不溶化及び浄化作用を行うものである。   Peridotite, a type of igneous rock, is a natural inorganic mineral that contains a large amount of magnesium and iron. Depending on the type of harmful substance, light-burned magnesite, light-burned dolomite, soluble phosphorus fertilizer, and burned shell powder are used. By mixing and adding, the efficiency as the hazardous substance treating agent T is increased, and insolubilization and purification are performed simultaneously with separation and decomposition.

次に一般的な未焼成カンラン岩、及びその他の混合・添加剤の成分分析値などについて説明する。   Next, general uncalcined peridotite and other component / additive component analysis values will be described.

未焼成カンラン岩の成分分析値（重量％）は、ＭｇＯ ４８．３２％、ＣａＯ １．４８％、ＳｉＯ２ ３９．３６％、Ｆｅ２Ｏ３ ９．０６％、Ａｌ２Ｏ３ ０．７７％、残余である。 The component analysis values (% by weight) of the uncalcined peridotite are: MgO 48.32%, CaO 1.48%, SiO 2 39.36%, Fe 2 O 3 9.06%, Al 2 O 3 0.77%. , The rest.

軽焼マグネサイトの成分分析値（重量％）は、ＭｇＯ ９３．６８％、ＣａＯ １．２８％、ＳｉＯ２ ０．９９％、Ｆｅ２Ｏ３ ０．２３％、Ａｌ２Ｏ３ ０．２１％、残余である。 The component analysis values (weight%) of light-fired magnesite are: MgO 93.68%, CaO 1.28%, SiO 2 0.99%, Fe 2 O 3 0.23%, Al 2 O 3 0.21% , The rest.

軽焼ドロマイトの成分分析値（重量％）は、ＭｇＯ ４０．３２％、ＣａＯ ５５．４８％、ＳｉＯ２ １．０５％、Ｆｅ２Ｏ３ ０．２６％、Ａｌ２Ｏ３ ０．２７％、残余である。 The component analysis value (weight%) of lightly burned dolomite is MgO 40.32%, CaO 55.48%, SiO 2 1.05%, Fe 2 O 3 0.26%, Al 2 O 3 0.27%, The rest.

焼成貝殻粉末の成分分析値（重量％）は、ＭｇＯ ０．３５％、ＣａＯ ９６．２８％、ＳｉＯ２ ０．３２％、Ｆｅ２Ｏ３ ０．１２％、Ａｌ２Ｏ３ ０．５５％、Ｋ２０ ０．４２％、Ｎａ２Ｏ １．１３％、残余である。 The component analysis value (% by weight) of the fired shell powder is as follows: MgO 0.35%, CaO 96.28%, SiO 2 0.32%, Fe 2 O 3 0.12%, Al 2 O 3 0.55%, K 2 0 0.42%, Na 2 O 1.13%, remaining.

溶性燐肥の成分分析値（重量％）は、ＭｇＯ １２．３５％、ＣａＯ ４４．２８％、ＳｉＯ２ ２１．５６％、Ｐ２Ｏ５ ２０．００％、残余である。 The component analysis values (% by weight) of soluble phosphorous fertilizer are MgO 12.35%, CaO 44.28%, SiO 2 21.56%, P 2 O 5 20.00%, and the remainder.

そして、前記ＭｇＯは水和反応により水酸化イオンを放出し、これが有害物質の元素（例えば鉛Ｐｂ２+）を水酸化物（Ｐｂ（ＯＨ）２）として沈殿させ、さらに空気中の炭酸ガスと反応し、炭酸マグネシウム（ＭｇＣＯ３・３Ｈ２Ｏ）反応を促進する過程でケイ素粒子（ＳｉＯ２）元素の粒子間にマグネシウム炭酸塩結晶が成長して粒子を絡める。これにより有害元素を吸着した鉱物は強固な結晶体となる。 The MgO releases hydroxide ions by a hydration reaction, which precipitates harmful elements (for example, lead Pb 2+ ) as hydroxides (Pb (OH) 2 ), and further adds carbon dioxide in the air. In the process of reacting and accelerating the magnesium carbonate (MgCO 3 .3H 2 O) reaction, a magnesium carbonate crystal grows between the particles of silicon particles (SiO 2 ) and entangles the particles. Thereby, the mineral which adsorb | sucked the harmful element turns into a strong crystal.

ＭｇＯ＋Ｈ２Ｏ→Ｍｇ（ＯＨ）２
Ｍｇ（ＯＨ）２＋Ｈ２Ｏ＋ＣＯ２→ＭｇＣＯ３＋２Ｈ２Ｏ
酸化カルシウムは酸性水を中和させる効果があり、さらに以下の反応によって酸性土壌や酸性水に含まれた例えば砒素や鉛など有害物質の元素が固定される。 MgO + H 2 O → Mg (OH) 2
Mg (OH) 2 + H 2 O + CO 2 → MgCO 3 + 2H 2 O
Calcium oxide has the effect of neutralizing acidic water, and the elements of harmful substances such as arsenic and lead contained in acidic soil and acidic water are fixed by the following reaction.

ＨＡｓＯ４ −＋Ｃａ２＋＋ｎＨ２Ｏ→ＣａＨＡｓＯ４・ｎＨ２Ｏ
Ｈ２ＡｓＯ４ ２−＋Ｃａ２＋＋ｎＨ２Ｏ→ＣａＨＡｓＯ４・ｎＨ２Ｏ＋Ｈ＋
酸化鉄は、それが酸化物（Ｆｅ２Ｏ３）であっても、水酸化物（Ｆｅ（ＯＨ）２）であっても、有害物質の元素は表面に吸着される。この反応は次の反応式で示され、赤鉄鉱や針鉄鉱が生成される。 HAsO 4 − + Ca 2+ + NH 2 O → CaHAsO 4 .nH 2 O
H 2 AsO 4 2− + Ca 2+ + nH 2 O → CaHAsO 4 .nH 2 O + H +
Whether iron oxide is an oxide (Fe 2 O 3 ) or a hydroxide (Fe (OH) 2 ), harmful elements are adsorbed on the surface. This reaction is represented by the following reaction formula, and hematite and goethite are produced.

ＦｅＳ２＋５／２Ｈ２Ｏ＋１５／４Ｏ２→２ＳＯ４ ２−＋４Ｈ＋＋ＦｅＯＯＨ
ＦｅＳ２＋２Ｈ２Ｏ＋１５／４Ｏ２→２ＳＯ４ ２−＋４Ｈ＋＋Ｆｅ２Ｏ３
５酸化リン（Ｐ２Ｏ５）は水酸化マグネシウムや水酸化カルシウムと反応し、リン酸塩の結晶（リン酸マグネシウムやリン酸カルシウム）の強固な結晶体の内部に有害物質の元素を封じ込めて固定化する。 FeS 2 + 5 / 2H 2 O + 15 / 4O 2 → 2SO 4 2− + 4H + + FeOOH
FeS 2 + 2H 2 O + 15 / 4O 2 → 2SO 4 2− + 4H + + Fe 2 O 3
Phosphorus pentoxide (P 2 O 5 ) reacts with magnesium hydroxide and calcium hydroxide to contain and fix the elements of harmful substances inside the strong crystals of phosphate crystals (magnesium phosphate and calcium phosphate) To do.

Ｃａ２＋＋ＰＯ４ ３−＋ＯＨ−→Ｃａ５（ＰＯ４）３ＯＨ＋Ｐｂ２＋→Ｃａ２＋＋Ｐｂ５（ＰＯ４）３ＯＨ
このように、有害物質処理剤Ｔの主成分である未焼成カンラン岩の酸化マグネシウムや酸化カルシウムが水と出会うと水和反応がおきて、水酸化マグネシウム及び水酸化カルシウムを生成し、吸着及びイオン交換能によって、その針状結晶中又は固溶体中に有害物質を取り込む。その後、空気中の炭酸ガスと反応して炭酸マグネシウム及び炭酸カルシウム反応を進行しながら、先に針状結晶中又は固溶体中に取り込んだ有害物質を結晶化し、固定化する。さらに、リン酸を含有した成分を加えることにより、リン酸マグネシウムとなり、長期的に安定な不溶出の固形物が得られるものである。 Ca 2+ + PO 4 3− + OH − → Ca 5 (PO 4 ) 3 OH + Pb 2+ → Ca 2+ + Pb 5 (PO 4 ) 3 OH
In this way, when magnesium oxide or calcium oxide of the uncalcined peridotite, which is the main component of the hazardous substance treating agent T, encounters water, a hydration reaction takes place, producing magnesium hydroxide and calcium hydroxide, adsorbing and ionizing Due to the exchange ability, harmful substances are taken into the needle-like crystal or solid solution. Thereafter, while reacting with carbon dioxide gas in the air and proceeding with the magnesium carbonate and calcium carbonate reaction, the harmful substances previously taken into the needle-like crystals or the solid solution are crystallized and immobilized. Furthermore, by adding a component containing phosphoric acid, it becomes magnesium phosphate, and a long-term stable non-eluting solid can be obtained.

したがって、前記有害物質処理剤Ｔは、無機性炭酸化合物、水溶性有機物、圭酸塩、鉄塩や原油の成分である炭素と水素からできた炭化水素を含めたものと反応するため、様々な土壌中の成分と固化物を形成し、容易に溶出しない高高度の固化物となる。   Accordingly, the hazardous substance treating agent T reacts with inorganic carbonate compounds, water-soluble organic substances, oxalates, iron salts and those containing hydrocarbons made of carbon and hydrogen, which are components of crude oil. It forms a solidified product with the components in the soil and becomes a high-level solidified product that does not easily elute.

前記遠赤外線放射成分としては（４）結晶化ガラスとして、ＳｉＯ2 ４５．０％、Ｌｉ2ＣＯ3 ２１．５％、ＫＮＯ3 ２．６％、Ｃａ3（ＰＯ4）2 ３．０％、石英・長石斑岩 ２７．９％、（５）他の例としては、ＳｉＯ2 ４０．０％、Ｌｉ2ＣＯ3 ２０．６％、ＫＮＯ3 ２．１％、Ｃａ3（ＰＯ4）2 ２．５％、Ａｌ2Ｏ3 １．５％、マグネタイト（磁鉄鉱） ３３．３％としている。尚、前記成分中、石英・長石斑岩及びマグネタイトは、加熱すると遠赤外線を放射する遠赤外線放射成分である。これらの成分のガラスをそれぞれ溶融し、所定形状に成形して冷却した後、熱処理工程にて、ゆっくりと段階的に昇温させながら結晶化を行うことで、結晶化ガラスが得られる。さらに（５）コーディエライト（２ＭｇＯ−２Ａｌ2Ｏ3−５ＳｉＯ2） ３０％、木節粘土 ３０％、赤土 １０％、石英・長石斑岩 ３０％、（６）コーディエライト ４０％、木節粘土 ３５％、赤土 ５％、マグネタイト（磁鉄鉱） ２０％、第３実施例としては、コーディエライト ２５％、木節粘土 ２０％、赤土 ５％、石英・長石斑岩 ２０％、マグネタイト ３０％のようなものでもよい。 As the far-infrared radiation component, (4) as crystallized glass, SiO 2 45.0%, Li 2 CO 3 21.5%, KNO 3 2.6%, Ca 3 (PO 4 ) 2 3.0%, Quartz / feldspar porphyry 27.9%, (5) Other examples include SiO 2 40.0%, Li 2 CO 3 20.6%, KNO 3 2.1%, Ca 3 (PO 4 ) 2 2 0.5%, Al 2 O 3 1.5%, magnetite (magnetite) 33.3%. Of the above components, quartz / feldspar porphyry and magnetite are far-infrared radiation components that emit far-infrared radiation when heated. Each of these component glasses is melted, formed into a predetermined shape, cooled, and then crystallized while slowly raising the temperature in a heat treatment step to obtain crystallized glass. And (5) cordierite (2MgO-2Al 2 O 3 -5SiO 2) 30%, 30% kibushi clay, red clay 10%, quartz-feldspar porphyry 30%, (6) cordierite 40%, knots 35% clay, 5% red clay, 20% magnetite (magnetite), the third example is cordierite 25%, Kibetsu clay 20%, red clay 5%, quartz and feldspar porphyry 20%, magnetite 30% Something like that.

次に前記構成についてその作用を説明する。トンネル１の掘削は、掘削装置２により行われる。尚、掘削は発破によって行ってもよく、このような発破作業によって生じた岩石等のずりを含む土砂類Ｓを処理する場合もある。   Next, the operation of the above configuration will be described. The excavation of the tunnel 1 is performed by the excavator 2. Excavation may be carried out by blasting, and earth and sand S containing shear such as rocks generated by such blasting work may be processed.

掘削された土砂類Ｓをトンネル１の入口１Ｂより外部に排出するために、土砂類Ｓは積み込み重機４により集積用ホッパー３Ａに投入され、投入された土砂類Ｓは第１のコンベア３を介して排出用ホッパー３Ｂよりミキサー６に投入される。そしてミキサー６においては、水供給路９より水Ｗが供給されると共に、供給路10から有害物質処理剤Ｔが供給される。尚、この有害物質処理剤Ｔの供給は土砂類Ｓ中に有害物質が含まれている土砂類Ｓの場合に行われる。このミキサー６による土砂類Ｓと水と有害物質処理剤Ｔとの混合により有害物質は分解、不溶化、浄化される。このように処理された土砂類Ｓは、第３のコンベア８のコンベアを介して運搬車両７に積み込まれてトンネル１の外部へと搬出される。ミキサー６はバッチ式或いは連続式いずれの形式のものであってもよい。   In order to discharge the excavated earth and sand S from the entrance 1B of the tunnel 1 to the outside, the earth and sand S is thrown into the accumulation hopper 3A by the loading heavy machine 4, and the introduced earth and sand S passes through the first conveyor 3. Then, it is put into the mixer 6 from the discharge hopper 3B. In the mixer 6, water W is supplied from the water supply path 9, and the hazardous substance treating agent T is supplied from the supply path 10. The supply of the harmful substance treating agent T is performed in the case of earth and sand S in which earth and sand S contains harmful substances. By mixing the earth and sand S, water, and the hazardous substance treating agent T by the mixer 6, the harmful substance is decomposed, insolubilized and purified. The earth and sand S thus processed is loaded onto the transport vehicle 7 via the conveyor of the third conveyor 8 and carried out of the tunnel 1. The mixer 6 may be of a batch type or a continuous type.

尚、ミキサー６の混合において、処理すべき有害物質が鉛の場合は、主成分のカンラン岩に、混合剤として、５酸化リン（Ｐ２Ｏ５）を含む溶成燐肥を加えた処理剤Ｔを調合し、処理すべき有害物質が砒素の場合は、主成分のカンラン岩に、混合剤として、軽焼マグネサイトや軽焼ドロマイト、貝殻粉末などの酸化カルシウムや鉄分の多い混合剤を加えて処理剤Ｔを調合する。尚、調合は汚染物質に対応して適宜設定されるもので、重量比で１：９９〜９９：１までの幅広い調合となる。 In addition, in the mixing of the mixer 6, when the harmful substance to be treated is lead, a treatment agent obtained by adding dissolved phosphorus fertilizer containing phosphorus pentoxide (P 2 O 5 ) as a mixing agent to the main peridotite. When arsenic is the harmful substance to be treated, arsenic is added to the main component peridotite, with a mixture of calcium oxide and iron, such as light-burned magnesite, light-burned dolomite, and shell powder as a mixture. To prepare treatment agent T. In addition, a mixing | blending is suitably set according to a pollutant, and becomes a wide mixing | blending to 1: 99-99: 1 by weight ratio.

そして、混合において、酸化マグネシウムや水酸化カルシウムが水と出会うと、水和反応がおきて、水酸化マグネシウム及び水酸化カルシウムを生成し、有害物質を水酸化物として沈殿させ、吸着及びイオン交換能によって、その針状結晶中又は固溶体中に有害物質を取り込んで固定化し、粒状化物となってミキサー６の２次側６Ｂより排出される。   In mixing, when magnesium oxide or calcium hydroxide encounters water, a hydration reaction occurs, producing magnesium hydroxide and calcium hydroxide, precipitating harmful substances as hydroxides, adsorption and ion exchange capacity Thus, harmful substances are taken into and fixed in the needle-like crystal or solid solution, and are granulated and discharged from the secondary side 6B of the mixer 6.

さらに、ミキサー６後の第３のコンベア８での移送中や運搬車両７、或いは運搬車両７による土砂類Ｓの積み下ろし場所においては、土砂類Ｓは養生されることとなる。この養生中は炭酸マグネシウムや炭酸カルシウムが空気中の炭酸ガスと反応する炭酸ガス反応が進行し、先に針状結晶中又は固溶体中に取り込んだ湯外物質を結晶化し固定化して、これを不溶の固化物として長期に固定可能に処理することができる。   Furthermore, the earth and sand S is cured during the transfer by the third conveyor 8 after the mixer 6 and at the place where the earth and sand S is loaded or unloaded by the carrier vehicle 7 or the carrier vehicle 7. During this curing, a carbon dioxide reaction occurs in which magnesium carbonate or calcium carbonate reacts with carbon dioxide in the air, and the external substance previously taken into the needle-like crystal or solid solution is crystallized and immobilized, and this is insoluble. As a solidified product, it can be treated so as to be fixed for a long time.

以上のように、前記実施例においてはトンネル１を掘削する掘削装置２による掘削工程と、この掘削された土砂類Ｓを前記トンネル１より排出する積み込み重機４、第１のコンベア３、第２のコンベア５、第３のコンベア８、運搬車両７を備えた排出工程と、前記掘削された土砂類Ｓの有害物質を処理するため有害物質処理剤Ｔと土砂類Ｓをミキサー６により混合する処理工程を備え、前記処理工程を前記排出工程である第２のコンベア５と第３のコンベア８の間にミキサー６を設けて処理したことにより、トンネル１内で土砂類Ｓに含まれる湯外物質を分解、不溶化、浄化でき、有害物質のトンネル１外への大気放出を可及的に低減することができ、さらにトンネル１近くで処理用の土砂類Ｓの仮置き場所も不要となり、工事の省スペース化を図ることができる。   As mentioned above, in the said Example, the excavation process by the excavation apparatus 2 which excavates the tunnel 1, the loading heavy machine 4, the 1st conveyor 3, and 2nd which discharge | emit this excavated earth and sand S from the said tunnel 1 is carried out. Discharge process provided with conveyor 5, third conveyor 8, and transport vehicle 7, and a process of mixing hazardous substance treating agent T and earth and sand S by mixer 6 in order to process the harmful substances of excavated earth and sand S And the processing step is performed by providing a mixer 6 between the second conveyor 5 and the third conveyor 8 which are the discharging step, so that the outdoor substance contained in the earth and sand S in the tunnel 1 is removed. It can be decomposed, insolubilized and purified, and the release of harmful substances to the atmosphere outside the tunnel 1 can be reduced as much as possible. Furthermore, there is no need for a temporary storage place for the earth and sand S for treatment near the tunnel 1, saving the construction work. space It can be achieved.

また、前記掘削箇所はトンネル１であり、前記排出工程にミキサー６を設けると共に、該ミキサー６によって掘削土砂類Ｓと前記処理工程用の有害物質処理剤Ｔを混合することで、トンネル１掘削工事における有害物質の大気放出や山間地などの土砂類Ｓの仮置き場所を確保できないような場所でも土砂類Ｓを処理して排出することができる。   The excavation site is the tunnel 1, and a mixer 6 is provided in the discharge process, and the mixer 6 mixes the excavated earth and sand S and the hazardous substance treating agent T for the treatment process, thereby excavating the tunnel 1. The earth and sand S can be processed and discharged even in places where it is not possible to secure a temporary place for the earth and sand S such as in the mountainous areas such as atmospheric release of harmful substances.

さらに、前記有害物質処理剤Ｔは、未焼成カンラン岩を主成分とする有害物質の分解・不溶化・浄化剤であって、有害重金属類、油類、揮発性有機化合物等の有害化学物質に汚染された土砂類Ｓの処理に適用されるものであることにより、原料製造過程に焼成工程を有しない未焼成のカンラン岩を使用することで、有害物質を確実に処理することができる。   Furthermore, the hazardous substance treating agent T is a decomposition / insolubilization / purification agent for harmful substances mainly composed of uncalcined peridotite, and contaminates harmful chemical substances such as harmful heavy metals, oils and volatile organic compounds. By being applied to the treatment of the earth and sand S that has been produced, the use of unfired peridotite that does not have a firing step in the raw material production process makes it possible to reliably treat harmful substances.

以上のように本発明に係る掘削土砂類の処理方法は、地下鉄道、地下道、上水、下水などの水管設置などあらゆる掘削箇所に適用できる。   As described above, the method for treating excavated earth and sand according to the present invention can be applied to any excavation site such as a subway, an underground passage, water pipe installation such as clean water and sewage.

本発明の実施例１を示す説明図である。It is explanatory drawing which shows Example 1 of this invention.

符号の説明Explanation of symbols

１ トンネル（掘削箇所）
２ 掘削装置
３ 第１のコンベア
４ 積み込み重機
５ 第２のコンベア
６ ミキサー
７ 運搬車両
８ 第３のコンベア
９ 水供給路
10 有害物質処理剤の供給路
Ｓ 土砂類
Ｔ 有害物質処理剤

1 Tunnel (Excavation point)
2 Excavator 3 First Conveyor 4 Loading Heavy Machine 5 Second Conveyor 6 Mixer 7 Transport Vehicle 8 Third Conveyor 9 Water Supply Path
10 Hazardous Substance Treatment Channel S Sediment T Hazardous Substance Treatment Agent

Claims (3)

掘削箇所を掘削する掘削工程と、この掘削された土砂類を前記掘削箇所より排出する排出工程と、前記掘削された土砂類の有害物質を処理する処理工程を備えた掘削土砂類の排出において、前記処理工程を前記排出工程の途中に設けたことを特徴とする掘削土砂類の処理方法。   In the excavation step of excavating the excavation site, the discharge step of discharging the excavated earth and sand from the excavation site, and the discharge of excavated sediments including a processing step of processing harmful substances of the excavated sediments, A method for treating excavated earth and sand, wherein the treatment step is provided in the middle of the discharge step. 前記掘削箇所はトンネルなどの地下道であり、前記排出工程にミキサーを設けると共に、該ミキサーによって掘削土砂類と前記処理工程用の有害物質処理剤を混合することを特徴とする請求項１記載の掘削土砂類の処理方法。   2. The excavation according to claim 1, wherein the excavation site is an underground passage such as a tunnel, and a mixer is provided in the discharge process, and the excavated earth and sand and the hazardous substance treating agent for the treatment process are mixed by the mixer. Processing method of earth and sand. 前記有害物質処理剤は、未焼成カンラン岩を主成分とする有害物質の分解・不溶化・浄化剤であって、有害重金属類、油類、揮発性有機化合物等の有害化学物質に汚染された土砂類の処理に適用されるものであることを特徴とする請求項１又は２記載の掘削土砂類の処理方法。

The above hazardous substance treating agent is a decomposition, insolubilization and purification agent for harmful substances mainly composed of uncalcined peridotite, which is contaminated with harmful chemical substances such as harmful heavy metals, oils and volatile organic compounds. The method for treating excavated earth and sand according to claim 1 or 2, characterized by being applied to the treatment of a kind.

JP2006210377A 2006-08-01 2006-08-01 Disposal method for excavated sediment Pending JP2008038358A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010131517A (en) * 2008-12-04 2010-06-17 Taiheiyo Cement Corp Insolubilizing agent
JP2011111617A (en) * 2009-11-24 2011-06-09 Earth Kk Harmful discharge treating agent and treating method using the same
JP2017205701A (en) * 2016-05-18 2017-11-24 大成建設株式会社 Insolubilization method of rock muck, tunnel excavation system, and tunnel construction method
CN113900155A (en) * 2020-06-22 2022-01-07 夏普福山半导体株式会社 Proximity sensor and electronic device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010131517A (en) * 2008-12-04 2010-06-17 Taiheiyo Cement Corp Insolubilizing agent
JP2011111617A (en) * 2009-11-24 2011-06-09 Earth Kk Harmful discharge treating agent and treating method using the same
JP2017205701A (en) * 2016-05-18 2017-11-24 大成建設株式会社 Insolubilization method of rock muck, tunnel excavation system, and tunnel construction method
CN113900155A (en) * 2020-06-22 2022-01-07 夏普福山半导体株式会社 Proximity sensor and electronic device

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