JP2006152150A - Method for producing ground stabilizer - Google Patents

Method for producing ground stabilizer Download PDF

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JP2006152150A
JP2006152150A JP2004346432A JP2004346432A JP2006152150A JP 2006152150 A JP2006152150 A JP 2006152150A JP 2004346432 A JP2004346432 A JP 2004346432A JP 2004346432 A JP2004346432 A JP 2004346432A JP 2006152150 A JP2006152150 A JP 2006152150A
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ground improvement
clay
improvement material
coal ash
soil
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JP4609701B2 (en
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Hiroshi Kimura
博 木村
Yasuyoshi Shimazaki
保義 嶋崎
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a ground stabilizer using dredged soil. <P>SOLUTION: The method is one which produces a ground stabilizer from collected dredged soil containing calcium carbonate and coal ash produced from a thermoelectric power plant and comprises the dewatering step of dewatering collected dredged soil, the heating step of heating the collected dredged soil to thermally decompose the calcium carbonate into calcium oxide to obtain burned dredged soil, and the mixing step of mixing the burned dredged soil with coal ash to obtain the ground stabilizer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、地盤改良材の製造方法に関し、より詳細には、例えば珊瑚や貝類等の炭酸カルシウムを含有してなる浚渫土と、発電施設から産出された石炭灰とを用いて地盤改良材を製造する方法に関する。   The present invention relates to a method for producing a ground improvement material, and more specifically, a ground improvement material using a clay containing calcium carbonate such as straw and shellfish and coal ash produced from a power generation facility. It relates to a method of manufacturing.

一般に、浚渫土は、含水率が極めて高く、強度が低いという特性を有している。そこで、従来そのような浚渫土を再利用することを目的として、該浚渫土に対して、生石灰を主材として混合するとともに、例えば火力発電所等の発電施設から産出されたフライアッシュと称される石炭灰を助材として混合することにより地盤改良材を製造する方法が知られている（例えば、特許文献１〜特許文献３参照）。   In general, dredged soil has the characteristics that the moisture content is extremely high and the strength is low. Therefore, conventionally, for the purpose of reusing such dredged soil, quick lime is mixed with the dredged soil as a main material, and for example, it is called fly ash produced from a power generation facility such as a thermal power plant. There is known a method for producing a ground improvement material by mixing coal ash as an auxiliary material (for example, see Patent Documents 1 to 3).

特開２００１−５５７５６号公報JP 2001-55756 A 特開平５−３３１８２９号公報JP-A-5-331829 特開平５−３３１８３０号公報JP-A-5-331830

ところで、上記製造方法は、一般的な浚渫土を対象としたものであり、例えば海洋等からの浚渫土のように珊瑚および貝類等の炭酸カルシウムを含有してなるという特質を有しているものに適用できるかについては明らかにされていない。そのため、炭酸カルシウムを含有して成る浚渫土に応じた地盤改良材の製造方法が望まれている。   By the way, the above-mentioned manufacturing method is intended for general dredged soil, and has a characteristic that it contains calcium carbonate such as dredged and shellfish like dredged soil from the ocean, for example. It is not clarified whether it can be applied to. Therefore, the manufacturing method of the ground improvement material according to the clay containing calcium carbonate is desired.

本発明は、上記実情に鑑みて、炭酸カルシウムを含有してなる浚渫土を用いて、地盤改良に適した地盤改良材を製造することができる地盤改良材の製造方法を提供することを目的とする。   In view of the above circumstances, an object of the present invention is to provide a method for producing a ground improvement material capable of producing a ground improvement material suitable for ground improvement by using a clay containing calcium carbonate. To do.

上記目的を達成するために、本発明の請求項１に係る地盤改良材の製造方法は、炭酸カルシウムを含有してなる浚渫土と、発電施設から産出された石炭灰とを用いて地盤改良材を製造する方法であって、前記浚渫土を脱水させる脱水工程と、脱水させた浚渫土を加熱することにより、前記炭酸カルシウムを酸化カルシウムに熱分解させてなる燃焼浚渫土を得る加熱工程と、前記燃焼浚渫土と前記石炭灰とを混合することにより地盤改良材を得る混合工程とを含むことを特徴とする。   In order to achieve the above object, a method for producing a ground improvement material according to claim 1 of the present invention is a ground improvement material using dredged soil containing calcium carbonate and coal ash produced from a power generation facility. A dehydration step of dehydrating the clay, and a heating step of obtaining a combustion clay obtained by thermally decomposing the calcium carbonate into calcium oxide by heating the dehydrated clay, A mixing step of obtaining a ground improvement material by mixing the combustion clay and the coal ash.

本発明の地盤改良材の製造方法によれば、脱水工程において炭酸カルシウムを含有してなる浚渫土を脱水させ、加熱工程において脱水させた浚渫土を加熱することにより炭酸カルシウムを酸化カルシウムに熱分解させてなる燃焼浚渫土を得、混合工程において燃焼浚渫土と発電施設からの石炭灰とを混合することにより、酸化カルシウムと石炭灰とを有する地盤改良材を製造することができる。このような地盤改良材は、構成成分である酸化カルシウムが地盤改良の対象となる土壌中の水分と反応して水酸化カルシウムに変化し、この水酸化カルシウムが石炭灰とポゾラン反応することにより該土壌を固化させるため、良好な強度を有する土壌を生成させることができ、地盤の改良に適しているものになる。従って、炭酸カルシウムを含有してなる浚渫土を用いて、地盤改良に適した地盤改良材を製造することができるという効果を奏する。   According to the method for producing a ground improvement material of the present invention, the calcium carbonate-containing clay is dehydrated in the dehydration step, and the calcium carbonate dehydrated in the heating step is heated to thermally decompose calcium carbonate into calcium oxide. A ground improvement material having calcium oxide and coal ash can be produced by obtaining the combustion clay obtained by mixing the combustion clay and coal ash from the power generation facility in the mixing step. In such a ground improvement material, calcium oxide as a constituent component reacts with moisture in the soil to be ground improved and changes to calcium hydroxide, and this calcium hydroxide reacts with coal ash to cause pozzolanic reaction. Since the soil is solidified, it is possible to generate soil having good strength, which is suitable for ground improvement. Therefore, there is an effect that a ground improvement material suitable for ground improvement can be produced using the clay containing calcium carbonate.

以下に添付図面を参照して、本発明に係る地盤改良材の製造方法の好適な実施の形態について詳細に説明する。   Exemplary embodiments of a method for producing a ground improvement material according to the present invention will be described below in detail with reference to the accompanying drawings.

図１〜図３は、それぞれ本発明の実施の形態における地盤改良材の製造方法の各工程を模式的に示したものである。これらの図面を適宜参照しながら、本発明の実施の形態に係る地盤改良材の製造方法について説明する。本発明の実施の形態に係る地盤改良材の製造方法は、脱水工程と、加熱工程と、混合工程とを含むものである。   1 to 3 schematically show the respective steps of the ground improvement material manufacturing method according to the embodiment of the present invention. A method for manufacturing a ground improvement material according to an embodiment of the present invention will be described with reference to these drawings as appropriate. The ground improvement material manufacturing method according to the embodiment of the present invention includes a dehydration step, a heating step, and a mixing step.

脱水工程は、例えば海洋等の海底土壌中から浚渫された土壌（以下、採取浚渫土ともいう）１０を脱水させる工程である。より詳細に説明すると次のようになる。採取浚渫土１０には、多量の水分、二酸化ケイ素（ＳｉＯ2）や酸化アルミニウム（Ａｌ2Ｏ3）等を含む粘土分、生物の死骸や地上からの流出物である有機物が含まれているだけでなく、例えば珊瑚や貝類等の炭酸カルシウム（ＣａＣＯ3）も含まれている。そして、図１に示したように、採取浚渫土１０を脱水処理装置２０に投入して、該採取浚渫土１０に含まれている多量の水分２１を取り除く工程である。かかる工程により、脱水処理が施された浚渫土（以下、脱水浚渫土ともいう）１１が得られる。 The dehydration step is a step of dehydrating soil (hereinafter also referred to as collected dredged soil) 10 dredged from undersea soil such as the ocean. More detailed description is as follows. The collected clay 10 contains a large amount of water, clay containing silicon dioxide (SiO 2 ), aluminum oxide (Al 2 O 3 ), etc., dead bodies of organisms, and organic matter that is effluent from the ground. In addition, for example, calcium carbonate (CaCO 3 ) such as coral and shellfish is also included. Then, as shown in FIG. 1, the collected clay 10 is put into the dehydration processing apparatus 20 to remove a large amount of water 21 contained in the collected clay 10. Through this process, a clay (hereinafter also referred to as dehydrated clay) 11 that has been subjected to a dehydration treatment is obtained.

加熱工程は、脱水浚渫土１１を加熱する工程であり、より詳細には、図２に示したように、脱水浚渫土１１を加熱処理器３０に投入して、例えば８００℃以上の加熱処理を施し、加熱処理を施した浚渫土（以下、燃焼浚渫土ともいう）１２を得る工程である。   The heating step is a step of heating the dehydrated clay 11, and more specifically, as shown in FIG. 2, the dehydrated clay 11 is put into the heat treatment device 30 and, for example, a heat treatment of 800 ° C. or higher is performed. This is a step of obtaining a clay (hereinafter also referred to as combustion clay) 12 that has been subjected to heat treatment.

このような加熱工程により脱水浚渫土１１を構成する各成分は次のようになる。脱水浚渫土１１を構成する有機物は、加熱処理が施されることにより、燃焼して微灰となる。脱水浚渫土１１を構成する炭酸カルシウムは、下記の反応式（１）のように熱分解して、生石灰（酸化カルシウム（ＣａＯ））および二酸化炭素（ＣＯ2）になる。 Each component which comprises the dewatered clay 11 by such a heating process is as follows. The organic matter composing the dewatered clay 11 is burned into fine ash by being subjected to heat treatment. Calcium carbonate constituting the dehydrated clay 11 is thermally decomposed into quick lime (calcium oxide (CaO)) and carbon dioxide (CO 2 ) as shown in the following reaction formula (1).

反応式（１）：ＣａＣＯ3→（加熱（８００℃以上））→ＣａＯ＋ＣＯ2 Reaction formula (1): CaCO 3 → (heating (800 ° C. or higher)) → CaO + CO 2

炭酸カルシウムが熱分解することにより得られる酸化カルシウムは、セメントの主成分と同じものである。一方、炭酸カルシウムが熱分解することにより得られる二酸化炭素は、加熱処理器３０を構成する排出管３１を通じて外部に排出されることになる。   Calcium oxide obtained by thermally decomposing calcium carbonate is the same as the main component of cement. On the other hand, carbon dioxide obtained by thermal decomposition of calcium carbonate is discharged to the outside through the discharge pipe 31 that constitutes the heat treatment device 30.

混合工程は、燃焼浚渫土１２と、フライアッシュと称される石炭灰４２とを混合する工程であり、より詳細には、図３に示したように、燃焼浚渫土１２と、石炭を燃料とする火力発電所４０から産出された石炭灰４２とを混合機５０に投入して混合処理を施すことにより地盤改良材１３を得る工程である。ここに、石炭灰４２について説明する。一般に石炭を燃料とする火力発電所４０では、燃焼後の石炭灰４２が産出される。このように産出された石炭灰４２は、例えばサイロ等の石炭灰貯蔵施設４１に貯蔵されている。従って、本工程では、燃焼浚渫土１２と、石炭灰貯蔵施設４１からの石炭灰４２とを混合機５０に投入して混合処理を施す工程である。このように混合工程で得られた地盤改良材１３は、所定の容器１３ａに封入される。   The mixing step is a step of mixing the combustion clay 12 and the coal ash 42 called fly ash, and more specifically, as shown in FIG. This is a step of obtaining the ground improvement material 13 by charging the coal ash 42 produced from the thermal power plant 40 to the mixer 50 and performing a mixing process. Here, the coal ash 42 will be described. In general, a thermal power plant 40 using coal as fuel produces coal ash 42 after combustion. The coal ash 42 thus produced is stored in a coal ash storage facility 41 such as a silo, for example. Therefore, in this process, the combustion clay 12 and the coal ash 42 from the coal ash storage facility 41 are charged into the mixer 50 to perform a mixing process. Thus, the ground improvement material 13 obtained by the mixing process is enclosed in a predetermined container 13a.

そして、上記製造方法により製造した地盤改良材１３（所定の容器１３ａに封入された地盤改良材１３）を、図４に示したように、地盤改良が必要とされる土地６０まで運搬した後に、該土地６０の所定個所６１に散布し、該地盤改良材１３と土壌とを混合撹拌する。これにより、地盤改良材１３と所定個所６１の土壌との間で次のような反応が生じることになる。   And after conveying the ground improvement material 13 (the ground improvement material 13 enclosed in the predetermined container 13a) manufactured by the said manufacturing method to the land 60 where a ground improvement is required, as shown in FIG. It sprays on the predetermined location 61 of this land 60, and this ground improvement material 13 and soil are mixed and stirred. As a result, the following reaction occurs between the ground improvement material 13 and the soil at the predetermined location 61.

地盤改良材１３を構成する酸化カルシウムは、土壌中の水分と反応することによりカルシウムイオン（Ｃａ2+）と、強アルカリ性を示す水酸化カルシウム（Ｃａ（ＯＨ）2）とに変化する。カルシウムイオンは、土壌中の粘土分である二酸化ケイ素や酸化アルミニウムと反応することにより該土壌を固化させることになる。 The calcium oxide composing the ground improvement material 13 changes into calcium ions (Ca 2+ ) and calcium hydroxide (Ca (OH) 2 ) exhibiting strong alkalinity by reacting with moisture in the soil. Calcium ions solidify the soil by reacting with silicon dioxide and aluminum oxide, which are clay components in the soil.

強アルカリ性を示す水酸化カルシウムは、地盤改良材１３を構成する石炭灰との間でポゾラン反応（固化反応）を生じ、これにより、該地盤改良材１３と混合撹拌された土壌は、徐々に固化することになる。つまり、水酸化カルシウムと石炭灰との間でポゾラン反応が生じることにより、地盤改良材１３が混合撹拌された土壌の強度の徐々に向上させることになる。その結果、良好な強度を有する土壌を生成させることができ、上記土地６０の地盤を改良することができる。   The calcium hydroxide exhibiting strong alkalinity causes a pozzolanic reaction (solidification reaction) with the coal ash constituting the ground improvement material 13, whereby the soil mixed and stirred with the ground improvement material 13 is gradually solidified. Will do. That is, when a pozzolanic reaction occurs between calcium hydroxide and coal ash, the strength of the soil in which the ground improvement material 13 is mixed and stirred is gradually improved. As a result, soil having good strength can be generated, and the ground of the land 60 can be improved.

以上説明したように、本発明の実施の形態に係る地盤改良材の製造方法においては、脱水工程において採取浚渫土１０を脱水させ、加熱工程において脱水浚渫土１１中の炭酸カルシウムを酸化カルシウムに熱分解させてなる燃焼浚渫土１２を得、混合工程において燃焼浚渫土１２と石炭灰４２とを混合することにより、酸化カルシウムと石炭灰とを有する地盤改良材１３を製造することができる。このような地盤改良材１３は、構成成分である酸化カルシウムが地盤改良の対象となる土壌の水分と反応して水酸化カルシウムに変化し、この水酸化カルシウムが石炭灰４２とポゾラン反応することにより該土壌を固化させるため、良好な強度を有する土壌を生成させることができ、地盤の改良に適しているものになる。従って、上記製造方法によれば、炭酸カルシウム成分を含有してなる浚渫土を用いて、地盤改良に適した地盤改良材１３を製造することができる。   As described above, in the ground improvement material manufacturing method according to the embodiment of the present invention, the collected clay 10 is dehydrated in the dehydration step, and the calcium carbonate in the dehydrated clay 11 is heated to calcium oxide in the heating step. By obtaining the combustion clay 12 obtained by decomposition and mixing the combustion clay 12 and the coal ash 42 in the mixing step, the ground improvement material 13 having calcium oxide and coal ash can be produced. In such a ground improvement material 13, calcium oxide as a constituent component reacts with the moisture of the soil to be ground improved and changes to calcium hydroxide, and this calcium hydroxide reacts with the coal ash 42 and a pozzolanic reaction. Since the soil is solidified, soil having good strength can be generated, which is suitable for improving the ground. Therefore, according to the said manufacturing method, the ground improvement material 13 suitable for ground improvement can be manufactured using the clay containing a calcium carbonate component.

また、上記製造方法によれば、採取浚渫土１０等の土壌、および石炭灰４２の有効利用が図ることができる結果、従来石炭灰等を廃棄処分していたことによる環境への負荷、すなわち環境破壊の低減化を図ることができる。   Moreover, according to the said manufacturing method, as a result of being able to aim at the effective utilization of soil, such as the extraction dredged soil 10, and the coal ash 42, the environmental load by having discarded the coal ash etc. conventionally, ie, environment It is possible to reduce the destruction.

更に、上記製造方法により製造された地盤改良材１３によりそれまで活用できなかった軟弱地盤の改良を図ることができる。   Furthermore, the ground improvement material 13 manufactured by the above manufacturing method can improve the soft ground that could not be utilized so far.

以上本発明の好適な実施の形態について説明したが、本発明はこれに限定されるものではなく、種々の変更を行うことができる。上記の実施の形態では、製造した地盤改良材１３を所定の容器１３ａに封入した態様で地盤改良が必要な土地まで運搬していたが、本発明では、可搬式の加熱処理器および混合機を利用して、地盤改良が必要な土地で燃焼浚渫土を生成した後に、地盤改良材を製造しながら該土地の所定個所に散布して土壌と混合させても良い。   Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made. In the above embodiment, the manufactured ground improvement material 13 is transported to the land where the ground improvement is required in a state where the ground improvement material 13 is enclosed in a predetermined container 13a. However, in the present invention, the portable heat treatment device and the mixer are provided. Utilizing this method, after generating burning dredged soil on land that requires ground improvement, the ground improving material may be dispersed and applied to a predetermined portion of the land while being mixed with the soil.

以上のように、本発明に係る地盤改良材の製造方法によれば、例えば珊瑚や貝類等の炭酸カルシウムを含有して成る浚渫土と、発電施設から産出された石炭灰とを用いて地盤改良材を製造するのに有用である。   As described above, according to the method for producing a ground improvement material according to the present invention, for example, ground improvement using dredged soil containing calcium carbonate such as straw and shellfish and coal ash produced from a power generation facility is used. Useful for manufacturing materials.

本発明の実施の形態に係る地盤改良材の製造方法の各工程を模式的に示した模式図である。It is the schematic diagram which showed typically each process of the manufacturing method of the ground improvement material which concerns on embodiment of this invention. 本発明の実施の形態に係る地盤改良材の製造方法の各工程を模式的に示した模式図である。It is the schematic diagram which showed typically each process of the manufacturing method of the ground improvement material which concerns on embodiment of this invention. 本発明の実施の形態に係る地盤改良材の製造方法の各工程を模式的に示した模式図である。It is the schematic diagram which showed typically each process of the manufacturing method of the ground improvement material which concerns on embodiment of this invention. 図１〜図３の各工程により製造された地盤改良材の利用形態を模式的に示した模式図である。It is the schematic diagram which showed typically the utilization form of the ground improvement material manufactured by each process of FIGS. 1-3.

符号の説明Explanation of symbols

１０ 採取浚渫土
１１ 脱水浚渫土
１２ 燃焼浚渫土
１３ 地盤改良材
２０ 脱水処理装置
３０ 加熱処理器
４０ 火力発電所
４２ 石炭灰
５０ 混合機 DESCRIPTION OF SYMBOLS 10 Sampling clay 11 Dehydration clay 12 Combustion clay 13 Ground improvement material 20 Dehydration processing apparatus 30 Heat processing unit 40 Thermal power plant 42 Coal ash 50 Mixer

Claims (1)

炭酸カルシウムを含有してなる浚渫土と、
発電施設から産出された石炭灰と
を用いて地盤改良材を製造する方法であって、
前記浚渫土を脱水させる脱水工程と、
脱水させた浚渫土を加熱することにより、前記炭酸カルシウムを酸化カルシウムに熱分解させてなる燃焼浚渫土を得る加熱工程と、
前記燃焼浚渫土と前記石炭灰とを混合することにより地盤改良材を得る混合工程と
を含むことを特徴とする地盤改良材の製造方法。 Dredged soil containing calcium carbonate;
A method for producing a ground improvement material using coal ash produced from a power generation facility,
A dehydration step of dewatering the clay;
A heating step of obtaining a burning clay obtained by thermally decomposing the calcium carbonate into calcium oxide by heating the dehydrated clay;
And a mixing step of obtaining a ground improvement material by mixing the combustion clay and the coal ash.
JP2004346432A 2004-11-30 2004-11-30 Method for manufacturing ground improvement material Expired - Fee Related JP4609701B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100981358B1 (en) 2009-09-25 2010-09-10 이한재 The soil composition and its manufacturing method that using the dredged soils and industrial by-product for reclaiming the public surface of water

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51132611A (en) * 1974-11-11 1976-11-17 Yoshiroku Terao Method of producing soil stabilizer employing sludge
JPH05331829A (en) * 1992-05-29 1993-12-14 Tokyo Electric Power Co Inc:The Surplus soil improving method using shell incineration lime produced out of shell adhering to intake pipe for power station
JPH1057991A (en) * 1996-08-14 1998-03-03 Chichibu Onoda Cement Corp Treating material of dredged mud and its treatment
JP2000143309A (en) * 1998-11-09 2000-05-23 Tohoku Ceramic Kk Artificial lightweight aggregate and its production
JP2001055756A (en) * 1999-08-20 2001-02-27 Chubu Electric Power Co Inc Improved soil and its manufacture
JP2003320397A (en) * 2002-04-30 2003-11-11 Chugai Ro Co Ltd Incineration treatment method for sewage sludge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51132611A (en) * 1974-11-11 1976-11-17 Yoshiroku Terao Method of producing soil stabilizer employing sludge
JPH05331829A (en) * 1992-05-29 1993-12-14 Tokyo Electric Power Co Inc:The Surplus soil improving method using shell incineration lime produced out of shell adhering to intake pipe for power station
JPH1057991A (en) * 1996-08-14 1998-03-03 Chichibu Onoda Cement Corp Treating material of dredged mud and its treatment
JP2000143309A (en) * 1998-11-09 2000-05-23 Tohoku Ceramic Kk Artificial lightweight aggregate and its production
JP2001055756A (en) * 1999-08-20 2001-02-27 Chubu Electric Power Co Inc Improved soil and its manufacture
JP2003320397A (en) * 2002-04-30 2003-11-11 Chugai Ro Co Ltd Incineration treatment method for sewage sludge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100981358B1 (en) 2009-09-25 2010-09-10 이한재 The soil composition and its manufacturing method that using the dredged soils and industrial by-product for reclaiming the public surface of water

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