JP2008008023A - Method of consolidating ground containing calcium, by using microorganisms - Google Patents
Method of consolidating ground containing calcium, by using microorganisms Download PDFInfo
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- JP2008008023A JP2008008023A JP2006179162A JP2006179162A JP2008008023A JP 2008008023 A JP2008008023 A JP 2008008023A JP 2006179162 A JP2006179162 A JP 2006179162A JP 2006179162 A JP2006179162 A JP 2006179162A JP 2008008023 A JP2008008023 A JP 2008008023A
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- ground
- microorganisms
- calcium
- carbon dioxide
- containing calcium
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Links
- 244000005700 microbiome Species 0.000 title claims abstract description 48
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000011575 calcium Substances 0.000 title claims abstract description 35
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 19
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 18
- 230000002503 metabolic effect Effects 0.000 claims abstract description 12
- 150000001341 alkaline earth metal compounds Chemical class 0.000 claims abstract description 11
- 235000015097 nutrients Nutrition 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 11
- 239000000292 calcium oxide Substances 0.000 claims description 3
- 229940087373 calcium oxide Drugs 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 230000004060 metabolic process Effects 0.000 claims description 2
- 230000002411 adverse Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000007596 consolidation process Methods 0.000 abstract description 3
- 239000003440 toxic substance Substances 0.000 abstract 2
- 231100000481 chemical toxicant Toxicity 0.000 abstract 1
- 231100000614 poison Toxicity 0.000 abstract 1
- 238000005728 strengthening Methods 0.000 abstract 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 239000002689 soil Substances 0.000 description 6
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 4
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 4
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 4
- 159000000007 calcium salts Chemical class 0.000 description 4
- 239000008103 glucose Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000012153 distilled water Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000011041 water permeability test Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 150000001720 carbohydrates Chemical class 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 230000037323 metabolic rate Effects 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- -1 silica compound Chemical class 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- OWEGMIWEEQEYGQ-UHFFFAOYSA-N 100676-05-9 Natural products OC1C(O)C(O)C(CO)OC1OCC1C(O)C(O)C(O)C(OC2C(OC(O)C(O)C2O)CO)O1 OWEGMIWEEQEYGQ-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229930091371 Fructose Natural products 0.000 description 1
- 239000005715 Fructose Substances 0.000 description 1
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 1
- 239000005913 Maltodextrin Substances 0.000 description 1
- 229920002774 Maltodextrin Polymers 0.000 description 1
- GUBGYTABKSRVRQ-PICCSMPSSA-N Maltose Natural products O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@@H]1O[C@@H]1[C@@H](CO)OC(O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-PICCSMPSSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910001617 alkaline earth metal chloride Inorganic materials 0.000 description 1
- WQZGKKKJIJFFOK-PHYPRBDBSA-N alpha-D-galactose Chemical compound OC[C@H]1O[C@H](O)[C@H](O)[C@@H](O)[C@H]1O WQZGKKKJIJFFOK-PHYPRBDBSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- GUBGYTABKSRVRQ-QUYVBRFLSA-N beta-maltose Chemical compound OC[C@H]1O[C@H](O[C@H]2[C@H](O)[C@@H](O)[C@H](O)O[C@@H]2CO)[C@H](O)[C@@H](O)[C@@H]1O GUBGYTABKSRVRQ-QUYVBRFLSA-N 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 150000002016 disaccharides Chemical class 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 229930182830 galactose Natural products 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 229940035034 maltodextrin Drugs 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002772 monosaccharides Chemical class 0.000 description 1
- 229920001542 oligosaccharide Polymers 0.000 description 1
- 150000002482 oligosaccharides Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0067—Function or property of ingredients for mortars, concrete or artificial stone the ingredients being formed in situ by chemical reactions or conversion of one or more of the compounds of the composition
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
Abstract
Description
本発明は海岸沿いの貝殻等、カルシウムを含む地盤中に微生物を投入し、微生物による代謝作用によって二酸化炭素を発生させ、この二酸化炭素とカルシウムが反応して地盤を固結する地盤改良方法に係り、特に、地盤の固結に際して有害物を発生せず、このため環境への悪影響を与えることがなく、しかも大掛かりな装置や有害な薬品を必要とせず、液状化対策工事、構造物基礎下の耐震補強等に適した地盤改良方法に関する。 The present invention relates to a ground improvement method in which microorganisms are introduced into ground containing calcium, such as shells along the coast, and carbon dioxide is generated by metabolic action of the microorganisms, and the carbon dioxide and calcium react to solidify the ground. In particular, no harmful substances are generated during consolidation of the ground, so there is no negative impact on the environment, and no large equipment or harmful chemicals are required. The present invention relates to a ground improvement method suitable for seismic reinforcement.
注入材により地盤を固結して地盤改良を図る方法として、従来、地盤中に注入材として水ガラスや、セメントを注入して地盤を固結する方法が採用されていた。 As a method of solidifying the ground with an injection material to improve the ground, conventionally, a method of solidifying the ground by injecting water glass or cement as an injection material into the ground has been adopted.
しかし、この方法では注入材が強アルカリであったり、あるいは強酸を使用したり等、環境への悪影響を与える恐れがあり、さらには取り扱いに注意が必要であり、また、使用
できる地盤が限定されている。
However, in this method, there is a risk of adverse effects on the environment, such as the use of strong alkalis or strong acids, and further care is required, and the ground that can be used is limited. ing.
地盤の液状化が発生する可能性のある地盤には、海岸沿いの貝殻等のカルシウムを含む地盤が多い。しかし、地盤改良の際、周辺環境への影響のない地盤改良方法が求められる場合、従来のシリカ化合物等の強アルカリや、反応材として酸では地盤改良後に未反応物質が溶解してしまう可能性があった。また、水ガラスとカルシウムを用いる注入材ではゲル化時間が短いことから地盤中に浸透せず広範囲の地盤改良が困難であった。 In the ground where liquefaction of the ground may occur, there are many grounds containing calcium such as shells along the coast. However, when a ground improvement method that does not affect the surrounding environment is required during ground improvement, there is a possibility that unreacted substances will dissolve after the ground improvement with a strong alkali such as a conventional silica compound or an acid as a reaction material. was there. Moreover, in the injection material using water glass and calcium, since the gelation time is short, it does not penetrate into the ground and it is difficult to improve the ground in a wide range.
また、本出願人によるアルカリ土金属化合物を有効成分とするＡ液と、炭酸、重炭酸、硫酸、燐酸およびこれらのアルカリ金属塩の群から選択される一種または複数種を有効成分とするＢ液とを土中に浸透または注入し、または土と混合し、不溶性塩を形成させることにより、アルカリ汚染が少なく、またはシリカ分が溶出しないため水質汚染が生じることのない発明が、すでに公知となっている。（特開２００４−６７８１９号公報） In addition, the A liquid containing an alkaline earth metal compound as an active ingredient by the present applicant, and the B liquid containing one or more kinds selected from the group consisting of carbonic acid, bicarbonate, sulfuric acid, phosphoric acid and alkali metal salts thereof. An invention has been already known in which water is not contaminated by infiltrating or injecting into the soil, or mixing with the soil to form an insoluble salt so that there is little alkali contamination or silica content does not elute. ing. (Japanese Patent Laid-Open No. 2004-67819)
本発明者らはさらに上記方法を改良し、微生物による代謝作用によって二酸化炭素を発生させることにより、酸やアルカリの使用量を少なくしても、ゲル化時間の長い、安定したゲルを得ることを見出し、環境に悪影響を与えないグラウトを開発して本発明を完成するに至った。
そこで、本発明の課題はさらに環境の影響を低減を追求し、自然の状態で存在する物質だけを使用して改良地盤周辺や、地盤改良後においても有害な物質を発生させず、上述の公知技術に存する欠点を改良した広範囲の地盤を改良する方法を開発することにある。 Therefore, the object of the present invention is to further reduce the influence of the environment, and by using only substances that exist in the natural state, no harmful substances are generated around the improved ground or after the ground improvement. The aim is to develop a method for improving a wide range of grounds which has improved the shortcomings of the technology.
上述の課題を解決するため、本発明によれば、カルシウムを含む地盤中に微生物を投入し、微生物の代謝作用により生成した炭酸ガスとカルシウムが反応して地盤を固結することを特徴とする。 In order to solve the above-mentioned problems, according to the present invention, a microorganism is introduced into a ground containing calcium, and carbon dioxide generated by metabolic action of the microorganism reacts with calcium to solidify the ground. .
さらに、上述の課題を解決するため、本発明によれば、カルシウムを含む地盤中に微生物、微生物の栄養源としての有機物およびアルカリ土金属化合物を投入し、地盤中のアルカリ土金属が反応して地盤を固結することを特徴とする。 Furthermore, in order to solve the above-described problems, according to the present invention, microorganisms, organic substances as nutrient sources for microorganisms and alkaline earth metal compounds are introduced into the ground containing calcium, and the alkaline earth metal in the ground reacts. It is characterized by consolidating the ground.
上述の本発明は海岸沿いの貝殻等、カルシウムを含む地盤中に微生物を投入し、微生物による代謝作用によって二酸化炭素を発生させ、この二酸化炭素とカルシウムが反応して地盤を固結するようにしたことから、地盤の固結に際して有害物質を発生せず、このため環境への悪影響を与えることがなく、しかも大掛かりな装置や有害な薬品を必要とせず、液状化対策工事、構造物基礎下の耐震補強等に適した地盤改良方法である。 In the present invention described above, microorganisms are introduced into ground containing calcium, such as shells along the coast, and carbon dioxide is generated by metabolic action of the microorganisms, and the carbon dioxide and calcium react to solidify the ground. Therefore, no harmful substances are generated during consolidation of the ground, so there is no negative impact on the environment, and no large equipment or harmful chemicals are required. This ground improvement method is suitable for seismic reinforcement.
微生物は次式に示されるとおり、代謝活動において有機栄養源から二酸化炭素を生じる。
Ｃ６Ｈ１２Ｏ６＋６Ｏ２→６ＣＯ２＋６Ｈ２Ｏ（好気性条件）
Ｃ６Ｈ１２Ｏ６→２ＣＯ２＋２Ｃ２Ｈ５ＯＨ（嫌気性条件）
このとき土壌中に溶解しているカルシウム、あるいは地盤中に注入したカルシウムと微生物の発生した二酸化炭素が反応し、次式のとおり、土粒子間に炭酸カルシウムを析出・沈澱し、地盤を硬化する。
Ｃａ２＋＋ＣＯ２→Ｈ２Ｏ→ＣａＣＯ３＋２Ｈ＋
Microorganisms produce carbon dioxide from organic nutrient sources in metabolic activity, as shown in the following formula.
C 6 H 12 O 6 + 6O 2 → 6CO 2 + 6H 2 O ( aerobic conditions)
C 6 H 12 O 6 → 2CO 2 + 2C 2 H 5 OH (anaerobic condition)
At this time, calcium dissolved in the soil or calcium injected into the ground reacts with carbon dioxide generated by microorganisms, and calcium carbonate precipitates and settles between the soil particles as shown in the following formula, hardening the ground. .
Ca 2+ + CO 2 → H 2 O → CaCO 3 + 2H +
そこで、カルシウムを含む地盤においては、地盤中に微生物を注入することで、微生物の排出する二酸化炭素により、地盤中のカルシウムが析出し地盤を固結することができる。 Therefore, in the ground containing calcium, by injecting microorganisms into the ground, calcium in the ground can be precipitated and solidified by the carbon dioxide discharged by the microorganisms.
さらに有機栄養源を注入することで有機栄養源の種類や量により微生物の代謝速度が変化し、二酸化炭素の排出量の変化に伴いカルシウム塩の析出量が変化することから、地盤の硬化時間および、強度を調整できる。地盤においてカルシウム溶解量が少ない場合や、地盤を高強度に改良する場合においてはさらにアルカリ土金属化合物を地盤中に注入しカルシウム塩の析出量を多くすることもできる。 Furthermore, by injecting organic nutrient sources, the metabolic rate of microorganisms changes depending on the type and amount of organic nutrient sources, and the precipitation amount of calcium salts changes with changes in carbon dioxide emissions. , The intensity can be adjusted. When the amount of calcium dissolved in the ground is small or when the ground is improved with high strength, an alkaline earth metal compound can be further injected into the ground to increase the amount of precipitated calcium salt.
また、微生物の多く存在する地盤においては、有機栄養源により地盤中の微生物の代謝を調整することにより、地盤中のカルシウムや注入したカルシウムと反応し、カルシウム塩を析出させることができる。 Moreover, in the ground where many microorganisms exist, by adjusting the metabolism of microorganisms in the ground with organic nutrient sources, it can react with calcium in the ground or injected calcium to precipitate calcium salts.
本発明の地盤改良方法はカルシウムを含む地盤中に微生物を投入し、微生物の代謝作用により生成した炭酸ガスとカルシウムが反応して地盤を固結することに存する。 The ground improvement method of the present invention consists in putting microorganisms into ground containing calcium and solidifying the ground by reacting carbon dioxide and calcium produced by the metabolic action of the microorganisms.
さらに、本発明の地盤改良方法はカルシウムを含む地盤中に微生物、微生物の栄養源としての有機物およびアルカリ土金属化合物を投入し、地盤中のアルカリ土金属が反応して地盤を固結することに存する。 Furthermore, the ground improvement method of the present invention is to put microorganisms, organic matter and alkaline earth metal compounds as nutrient sources of microorganisms into the ground containing calcium, and the alkaline earth metals in the ground react to solidify the ground. Exist.
本発明におけるカルシウムを地盤とは、貝殻や石灰等が地盤中に存在し、あるいは溶解してカルシウムイオンとして地盤中に存在しているものである。また、本発明におけるアルカリ土金属化合物とはアルカリ土金属の塩化物、微粒子石灰、および微粒子セメント群の中から選択される一種または複数種であり、好ましくは水溶性化合物である。また、炭酸カルシウムには３つの異なった結晶形（カルサイト、アラゴナイト、バテライト）があり、常温・常圧のカルシウム溶液中からは通常カルサイトが析出するが、Ｍｇ２＋やある種の有機成分を溶液中に少量添加すると、アラゴナイトやバテライトが析出する。アラゴナイトやバテライトは結晶が成長する際に顕著な方向性を有しているため、炭酸カルシウムの結晶形態を制御することができれば地盤の力学特性や水理学特性の異方性を比較的自由に制御できる可能性がある。 The term “calcium ground” in the present invention means that shells, lime, etc. are present in the ground or dissolved to be present as calcium ions in the ground. Further, the alkaline earth metal compound in the present invention is one or a plurality selected from the group of alkaline earth metal chloride, fine lime, and fine particle cement, and is preferably a water-soluble compound. Calcium carbonate has three different crystal forms (calcite, aragonite, and vaterite), and calcite usually precipitates from calcium solutions at room temperature and pressure, but Mg 2+ and certain organic components When a small amount is added to the solution, aragonite and vaterite are precipitated. Aragonite and vaterite have a remarkable direction during crystal growth, so if the crystal morphology of calcium carbonate can be controlled, the anisotropy of the mechanical and hydraulic properties of the ground can be controlled relatively freely. There is a possibility.
本発明に用いられる微生物は人体や環境に影響を与えにくいものならば、使用可能である。特に、乳酸菌やイースト菌等の従来より食品に利用されているものや、一般の地盤中に多く存在するものも利用できる。また、アンモニアからの硝化により硝酸カルシウムを析出させることもでき、施工地盤によって微生物の使い分けが可能である。
また、本発明により析出するカルシウム塩とは炭酸カルシウム、水酸化カルシウム、塩化カルシウム、硝酸カルシウム等で、注入する微生物や地盤に生息する微生物に影響される。有機栄養源とは微生物の栄養源となるものであり、好ましくは土壌中の微生物によって代謝分解される糖類である。例えば、グルコースやフラクトースなどの単糖類、スクロース、マルトースあるいはガラクトースなどの２糖類、その他のオリゴ糖、でんぷんやマルトデキストリンなどの多糖類、その他糖類を例示することができる。微生物によって、あるいは有機栄養源によって代謝速度が変化するため、施工時地盤によって選択する必要がある。
The microorganism used in the present invention can be used as long as it hardly affects the human body and the environment. In particular, those that have been used in foods such as lactic acid bacteria and yeasts, and those that are abundant in general ground can be used. In addition, calcium nitrate can be precipitated by nitrification from ammonia, and microorganisms can be properly used depending on the construction ground.
The calcium salt precipitated according to the present invention is calcium carbonate, calcium hydroxide, calcium chloride, calcium nitrate, etc., and is affected by microorganisms to be injected and microorganisms that inhabit the ground. An organic nutrient source is a source of microorganisms, and is preferably a saccharide that is metabolized and decomposed by microorganisms in the soil. Examples include monosaccharides such as glucose and fructose, disaccharides such as sucrose, maltose and galactose, other oligosaccharides, polysaccharides such as starch and maltodextrin, and other saccharides. Since the metabolic rate varies depending on the microorganism or organic nutrient source, it is necessary to select the soil according to the construction site.
(1)炭酸カルシウムの析出実験
微生物による炭酸カルシウムの析出実験を行った。
水溶性カルシウムとしては、石灰０.５９ｇを２５ｍｌの蒸留水に溶解したものと、貝殻を多く含む地盤３００ｇを採取し、５００ｍｌの蒸留水でよく攪拌後、濾過した液２５ｍｌの２種類を用意した。
(1) Precipitation experiment of calcium carbonate The precipitation experiment of calcium carbonate by microorganisms was conducted.
Two types of water-soluble calcium were prepared: 0.59 g of lime dissolved in 25 ml of distilled water and 300 g of ground containing a lot of shells, and after stirring well with 500 ml of distilled water, 25 ml of filtered liquid was prepared. .
微生物としてはイースト菌（日清フーズ株式会社製、日清スーパーカメリヤ）０.５ｇ、栄養源としてグルコースＣ６Ｈ１２Ｏ６を０.７ｇそれぞれ添加した。２５℃に静置し２４時間後に観察を行った。結果を表１に示す。 0.5 g of yeast (Nisshin Foods Co., Ltd., Nisshin Super Camellia) was added as a microorganism, and 0.7 g of glucose C 6 H 12 O 6 was added as a nutrient source. It left still at 25 degreeC and observed 24 hours afterward. The results are shown in Table 1.
微生物を添加した水溶液はＰＨの低下がみられ、有機栄養源を添加したものはＰＨの低下が促進されたのがわかった。カルシウムを含む液において微生物を添加した場合、白色のカルシウムの析出が見られた。また有機栄養源を加えることで析出量が多くなった。比較１、２に関しては、カルシウムを含むが微生物が存在しない液ではカルシウムの析出が見られなかった。また、カルシウムを含まない液においては微生物や有機栄養源を添加してもカルシウムの析出が見られなかった。 It was found that the aqueous solution to which microorganisms were added exhibited a decrease in pH, and that to which an organic nutrient source was added promoted the decrease in PH. When microorganisms were added to the liquid containing calcium, white calcium was observed to be precipitated. Moreover, the amount of precipitation increased by adding organic nutrient sources. As for comparisons 1 and 2, precipitation of calcium was not observed in the liquid containing calcium but not containing microorganisms. In addition, in the liquid not containing calcium, precipitation of calcium was not observed even when microorganisms or organic nutrient sources were added.
(2)透水試験
実施例５として１ｍのプラスチック製モールドに表１の実施例２で使用した貝殻を多く含む地盤を90ｃｍ充填（相対密度60％、透水係数2.02×10―２ｃｍ／ｓ）し、蒸留水100ｍｌあたりイースト菌２ｇとグルコース2.8ｇの割合で作成した薬液1500ｍｌを５サイクル通液し作成した供試体を脱型し10ｃｍに切断後、ラップで密封し２８日間養生後の透水係数を測定した。透水試験は地盤工学会基準に準じた加圧透水試験を行った。
また、同様に実施例６として豊浦標準砂（相対密度60％、透水係数1.5×10―２ｃｍ／ｓ）に実施例４で用いた石灰水100ｍｌあたりイースト菌２ｇとグルコース2.8ｇの割合で作成した薬液1500ｍｌを５サイクル通液し作成した供試体を脱型し10ｃｍに切断後、ラップで密封し２８日間養生後の透水係数を測定した。結果を表２に示す。
(2) Water permeability test As Example 5, a 1 m plastic mold was filled with 90 cm of ground containing a lot of shells used in Example 2 in Table 1 (relative density 60%, permeability coefficient 2.02 × 10 -2 cm / s). Measure the hydraulic conductivity after 28 days of curing after removing the sample prepared by passing 5 cycles of 1500 ml of the drug solution prepared at a ratio of 2 g yeast and 2.8 g glucose per 100 ml of distilled water, cutting into 10 cm, sealing with a wrap. did. The water permeability test was a pressurized water permeability test according to the Geotechnical Society standards.
Similarly, Example 6 was prepared at a ratio of 2 g yeast and 2.8 g glucose per 100 ml of lime water used in Example 4 on Toyoura standard sand (relative density 60%, water permeability 1.5 × 10 −2 cm / s). A specimen prepared by passing 1500 ml of chemical solution through 5 cycles was demolded, cut into 10 cm, sealed with a wrap, and measured for water permeability after curing for 28 days. The results are shown in Table 2.
実施例５、実施例６についてそれぞれ漏水係数の低下が見られた。特に貝殻を多く含む地盤（実施例５）での透水係数の低下がみられた。よって、本発明が地盤改良において有効であることが判った。 For Example 5 and Example 6, a decrease in the water leakage coefficient was observed. In particular, a decrease in the hydraulic conductivity was observed on the ground (Example 5) containing a lot of shells. Therefore, it turned out that this invention is effective in ground improvement.
カルシウムを含む地盤中に微生物を投入し、微生物の代謝作用により生成した炭酸ガスとカルシウムが反応して地盤を固結することにより、あるいは地盤中にアルカリ土金属化合物および微生物を投入し、微生物の代謝作用により生成した炭酸ガスとアルカリ土金属化合物が反応して地盤を固結することにより、地盤の固結に際して有害物を発生せず、このため環境への悪影響を与えることがなく、しかも大掛かりな装置や有害な薬品を必要とせず、液状化対策工事、構造物基礎下の耐震補強等の用途に適用できる。
Microorganisms are introduced into the ground containing calcium, and carbon dioxide generated by the metabolic action of the microorganisms reacts with calcium to solidify the ground, or alkaline earth metal compounds and microorganisms are introduced into the ground, Carbon dioxide gas generated by metabolic action reacts with alkaline earth metal compounds to consolidate the ground, so that no harmful substances are generated when the ground consolidates. It can be applied to liquefaction countermeasures, seismic reinforcement under the structure foundation, etc.
Claims (5)
3. The ground improvement method according to claim 1 or 2, wherein carbon dioxide gas is further added.
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |