JP4820884B2 - Grounding resistance reducing agent and method for producing grounding resistance reducing agent - Google Patents
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- 238000004519 manufacturing process Methods 0.000 title claims description 12
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- 239000002699 waste material Substances 0.000 claims description 25
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Description
本発明は、貝殻を利用した接地抵抗低減剤および接地抵抗低減剤の製造方法に関するものである。 The present invention relates to a ground resistance reducing agent using a shell and a method for producing the ground resistance reducing agent.
従来、建築物、無線鉄塔、送電線等の避雷針設置や電気工作物等の接地工事では、敷設される接地電極の周辺土壌に電導性を向上させるための接地抵抗低減剤が大量に混入される。これまでに色々な物質からなる接地抵抗低減剤が提案されている。 Conventionally, when installing lightning rods for buildings, radio towers, power transmission lines, etc., and for grounding works such as electrical works, a large amount of grounding resistance reducing agent is added to the surrounding soil of the ground electrode to be laid. . So far, ground resistance reducing agents made of various substances have been proposed.
例えば、特開平３−９３１８２号公報では、高吸収性樹脂とカルシウムアルミネートを主成分とする接地抵抗低減剤が提案されている（特許文献１）。この特許文献１によれば、高吸収性樹脂に多量の水を保水させることにより、電導性が向上すると記載されている。
For example, Japanese Patent Laid-Open No. 3-93182 proposes a ground resistance reducing agent mainly composed of a superabsorbent resin and calcium aluminate (Patent Document 1). According to
しかしながら、特許文献１に記載された発明においては、高吸水性樹脂が高価であるから接地電極の周辺に大量に混入させるにはコスト面での問題がある。また、周辺土壌を保水することにより電導性を向上させるタイプの接地抵抗低減剤は、土壌の水はけや気候・天候に影響され易く、雨量の少ない場所では効果が維持できないという問題もある。
However, in the invention described in
ところで、近年、環境問題に対する意識の高まりから廃棄物の処理の問題が大きくなっている。たとえば、自動車などのバッテリー（鉛蓄電池）の廃液は、特別管理産業廃棄物であって、従来、中和するか焼却して処分されている。いずれの方法も膨大な処理費用がかかり、不法投棄が後を絶たない。 By the way, in recent years, the problem of waste disposal has been increasing due to the growing awareness of environmental issues. For example, the waste liquid of a battery (lead storage battery) such as an automobile is a specially managed industrial waste, which has been conventionally disposed of by neutralization or incineration. Both methods have huge processing costs, and illegal dumping continues.
また、日本国内のホタテの水揚げ量は年間で約５１万４千トンであるが、その４０％に相当する約２０万５千トンが貝殻であり、その多くは処理されずに山積みにされているため、環境汚染の原因になる。 The amount of landed scallops in Japan is about 514,000 tons per year. About 205,000 tons, equivalent to 40%, are shells, and many of them are piled up without being processed. Therefore, it causes environmental pollution.
本発明は、このような問題点を解決するためになされたものであって、従来、特別管理産業廃棄物であるバッテリー廃液や廃棄処理される貝殻を有効利用し、安全かつ安価であって、接地抵抗低を大きく低減することが可能な接地抵抗低減剤および接地抵抗低減剤の製造方法を提供することを目的としている。 The present invention has been made to solve such problems, and conventionally, battery waste liquid that is specially managed industrial waste and shells to be disposed of are effectively used, and is safe and inexpensive, It is an object of the present invention to provide a ground resistance reducing agent capable of greatly reducing low ground resistance and a method for producing the ground resistance reducing agent.
本発明に係る接地抵抗低減剤は、貝殻粉末と、この貝殻粉末を混合することでイオン交換により中和する中和酸性溶液とを含有してなる。 The grounding resistance reducing agent according to the present invention contains shell powder and a neutralized acidic solution that is neutralized by ion exchange by mixing the shell powder.
本発明に係る接地抵抗低減剤の製造方法は、貝殻粉末と中和酸性溶液とを混合してイオン交換により中和させた後に、水分を蒸発させて接地抵抗低減剤を製造する。 In the method for producing a grounding resistance reducing agent according to the present invention, shell powder and a neutralized acidic solution are mixed and neutralized by ion exchange, and then water is evaporated to produce a grounding resistance reducing agent.
また、本発明の一態様として、前記中和酸性溶液がバッテリー廃液の水溶液であってもよい。 In one embodiment of the present invention, the neutralized acidic solution may be an aqueous battery waste solution.
本発明によれば、従来、特別管理産業廃棄物であるバッテリー廃液や廃棄処理される貝殻を接地抵抗低減剤として有効利用することができ、しかも安全かつ安価であって接地抵抗低を大きく低減することができる接地抵抗低減剤を提供することができる。 According to the present invention, it is possible to effectively use battery waste liquid, which is a specially managed industrial waste, and shells to be disposed of as a grounding resistance reducing agent, and it is safe and inexpensive, and greatly reduces low grounding resistance. It is possible to provide a ground resistance reducing agent that can be applied.
以下、本発明に係る接地抵抗低減剤の実施形態について説明する。 Hereinafter, embodiments of the ground resistance reducing agent according to the present invention will be described.
本実施形態の接地抵抗低減剤は、貝殻粉末と、この貝殻粉末を混入することで中和する中和酸性溶液とを含有してなる粉末状のものである。 The grounding resistance reducing agent of the present embodiment is a powder that contains shell powder and a neutralized acidic solution that is neutralized by mixing the shell powder.
本実施形態における貝殻粉末は、ホタテの貝殻をはじめ、牡蠣の貝殻、蜆の貝殻、アワビの貝殻等、カルシウムを含有するアルカリ性を示すものであればすべての貝殻が対象となり、特に限定されるものではない。また、貝殻粉末の粒径も特に限定されるものではなく、中和酸性溶液と混合して中和可能な粒径であればよい。 The shell powder in this embodiment is not limited to scallop shells, oyster shells, sea bream shells, abalone shells, etc., as long as it shows alkalinity containing calcium, and is particularly limited. is not. The particle diameter of the shell powder is not particularly limited as long as it can be mixed with the neutralized acidic solution and neutralized.
本実施形態ではホタテ貝殻を好適な一例として挙げるところ、このホタテ貝殻は、内表面が微量のケラチン質で覆われた炭酸カルシウムが主成分のカルサイトと呼ばれる結晶体である。また、数種の金属成分を含みアルカリ性を示す。主な化学成分は、カルシウムが約３７．７重量％、ケイ素が約１．５重量％、アルミニウムが約０．６重量％、鉄が約０．５重量％、硫黄が約０．１重量％、チタンが約０．０４重量％である。 In this embodiment, a scallop shell is given as a preferred example. This scallop shell is a crystal called calcite whose main surface is calcium carbonate whose inner surface is covered with a small amount of keratin. Moreover, it contains several metal components and exhibits alkalinity. The main chemical components are about 37.7% calcium, about 1.5% silicon, about 0.6% aluminum, about 0.5% iron, and about 0.1% sulfur. Titanium is about 0.04% by weight.
中和酸性溶液は、酸性の水溶液であり、アルカリ性を示す貝殻粉末を混入することでイオン交換により中和するものである。本実施形態における中和酸性溶液は、自動車等のバッテリー廃液を蒸留水で薄めた水溶液が使用される。本実施形態におけるバッテリー廃液は、車輌等で用いられる鉛蓄電池の電解液であり、一般に、比重約１．２８、硫酸濃度約３７．４重量％の希硫酸である。 The neutralized acidic solution is an acidic aqueous solution, and neutralizes by ion exchange by mixing shellfish powder showing alkalinity. As the neutralized acidic solution in the present embodiment, an aqueous solution obtained by diluting a battery waste solution of an automobile or the like with distilled water is used. The battery waste liquid in the present embodiment is an electrolytic solution of a lead storage battery used in a vehicle or the like, and is generally dilute sulfuric acid having a specific gravity of about 1.28 and a sulfuric acid concentration of about 37.4% by weight.
なお、中和酸性溶液はバッテリー廃液の水溶液に限定されるものではなく、必要に応じて適宜選択される。 The neutralized acidic solution is not limited to an aqueous solution of battery waste liquid, and is appropriately selected as necessary.
また、本実施形態における接地抵抗低減剤は、セメントを混入して製品化させてもよい。 Further, the ground resistance reducing agent in the present embodiment may be made into a product by mixing cement.
つぎに、本発明に係る接地抵抗低減剤の製造方法について図１に示すフローチャートを参照しながら説明する。 Next, a method for producing a ground resistance reducing agent according to the present invention will be described with reference to the flowchart shown in FIG.
本実施形態の接地抵抗低減剤の製造方法は、貝殻を粉末状に粉砕する粉砕工程Ｓ１と、貝殻粉末と中和酸性溶液とを混合する混合工程Ｓ２と、その混合物の水分を蒸発させる蒸発工程Ｓ３とを有する。以下に、各工程について詳細に説明する。 The ground resistance reducing agent manufacturing method of the present embodiment includes a pulverization step S1 for pulverizing shells into powder, a mixing step S2 for mixing shell powder and a neutralized acidic solution, and an evaporation step for evaporating the water in the mixture. S3. Below, each process is demonstrated in detail.
粉砕工程Ｓ１では、粉砕機によりホタテの貝殻を適当な大きさに粉砕し粉末状にする。粉砕する方法は、各種の粉砕機を使用すればよいが、ハンマーで叩いて粉砕してもよい。また、貝殻粉末の粒径は特に限定されるものではないし、必ずしも粒径が揃っていなくてもよいが、本実施形態では約４０ｍｍ以下に粉砕されたものを使用する。 In the pulverizing step S1, the scallop shells are pulverized to an appropriate size by a pulverizer to form a powder. As a method of pulverization, various pulverizers may be used, but pulverization may be performed by hitting with a hammer. Moreover, the particle diameter of the shell powder is not particularly limited, and the particle diameter does not necessarily have to be uniform, but in this embodiment, a powder pulverized to about 40 mm or less is used.
混合工程Ｓ２では、貝殻粉末と、中和酸性溶液とを混合して中和された混合物を生成する。本実施形態における中和酸性溶液は、バッテリー廃液を約１〜１０重量％とする水溶液である。本実施形態における混合工程Ｓ２では、この水溶液と、この水溶液の蒸留水と略同等重量の貝殻粉末とをミキサーに入れて撹拌することにより混合物が生成される。なお、貝殻粉末と、中和酸性溶液とを混合する方法はミキサーに限定されるものではなく、適宜選択されるものである。 In the mixing step S2, the shell powder and the neutralized acidic solution are mixed to produce a neutralized mixture. The neutralized acidic solution in the present embodiment is an aqueous solution containing about 1 to 10% by weight of battery waste liquid. In the mixing step S2 in the present embodiment, this aqueous solution and shell powder having substantially the same weight as the distilled water of this aqueous solution are placed in a mixer and stirred to produce a mixture. The method of mixing the shell powder and the neutralized acidic solution is not limited to a mixer, and is appropriately selected.
蒸発工程Ｓ３では、前記混合工程Ｓ２で生成された混合物の水分を蒸発させて、本発明に係る接地抵抗低減剤を生成する。本実施形態では、前記混合物をセラミック製の蒸発皿に載せ、電気炉で加熱することにより水分を蒸発させているが、水分を蒸発させる方法は特に限定されるものではなく、耐熱容器に入れてコンロ等で加熱してもよく、自然乾燥させてもよい。 In the evaporation step S3, the ground resistance reducing agent according to the present invention is generated by evaporating the moisture of the mixture generated in the mixing step S2. In this embodiment, the mixture is placed on a ceramic evaporating dish and heated in an electric furnace to evaporate the moisture, but the method for evaporating the moisture is not particularly limited, and is put in a heat-resistant container. You may heat with a stove etc. and may dry naturally.
貝殻粉末と中和酸性溶液とのイオン交換による中和は、前記混合工程Ｓ２から前記蒸発工程Ｓ３にかけて行われる。本実施形態ではアルカリ性のホタテの貝殻粉末と、酸性のバッテリー廃液の水溶液とが混合されることにより中和反応が開始され、化学的な平衡状態になるまでイオン交換が行われる。 Neutralization by ion exchange between the shell powder and the neutralized acidic solution is performed from the mixing step S2 to the evaporation step S3. In this embodiment, the neutralization reaction is started by mixing the alkaline scallop shell powder and the aqueous solution of the acidic battery waste solution, and ion exchange is performed until a chemical equilibrium is reached.
なお、生成された接地抵抗低減剤は、生成状態や接地工事等における使用状態に応じて適当な粒径に粉砕してもよい。 In addition, you may grind | pulverize the produced | generated ground-resistance reducing agent to a suitable particle size according to the use state in a production | generation state or grounding construction.
以上のような本実施形態の接地抵抗低減剤および接地抵抗低減剤の製造方法によれば、以下の効果を得ることがでる。
１．廃棄処理される貝殻と特別管理産業廃棄物であるバッテリー廃液という、産業廃棄物の組み合わせにより接地抵抗低減剤を製造することが可能であり、環境汚染の改善に大きく寄与することができる。
２．接地抵抗低減剤を安価に提供することができる。
３．アルカリ性の貝殻粉末と酸性の中和酸性溶液を中和反応させて中性化しているため、土壌に混入しても安全である。
４．接地電極の周辺土壌に混入することにより接地抵抗を大幅に低減することができる。
According to the ground resistance reducing agent and the ground resistance reducing agent manufacturing method of the present embodiment as described above, the following effects can be obtained.
1. It is possible to manufacture a ground resistance reducing agent by combining industrial wastes, ie, shells to be disposed of and battery waste liquids that are specially managed industrial wastes, which can greatly contribute to the improvement of environmental pollution.
2. A grounding resistance reducing agent can be provided at low cost.
3. Since it is neutralized by neutralizing the alkaline shell powder and the acidic neutralized acidic solution, it is safe to mix with soil.
4). By mixing in the soil around the ground electrode, the ground resistance can be greatly reduced.
実施例１では、接地抵抗低減剤を製造し、接地電極の周辺土壌に混入して接地抵抗の低減効果に関する実証実験を行った。 In Example 1, a ground resistance reducing agent was manufactured, mixed in the surrounding soil of the ground electrode, and a demonstration experiment on the effect of reducing ground resistance was performed.
『中和酸性溶液の物質特性について』
まず、本実施例１で使用する中和酸性溶液の物質特性を調べた。本実施例１で使用する中和酸性溶液は、約４．９５Ｌの蒸留水に対して約０．０５Ｌのバッテリー廃液を撹拌しながら少しずつ添加し、濃度が均一になるようにして生成した。
“Material Properties of Neutralized Acid Solution”
First, the material characteristics of the neutralized acidic solution used in Example 1 were examined. The neutralized acidic solution used in Example 1 was formed so that about 0.05 L of battery waste liquid was gradually added to about 4.95 L of distilled water while stirring to make the concentration uniform.
本実施例１では、中和酸性溶液の物質特性として、水素イオン指数pH（potential Hydrogen）、電気伝導度EC（Electrical Conductivity）および含有鉛イオン濃度を測定した。なお、pHの測定には、東亜ＤＫＫ株式会社製のpHメーターＨＭ２５Ｒを使用した。ECの測定には、東亜ＤＫＫ株式会社製の電気伝導度計測器ＣＭ３０Ｇを使用した。含有鉛イオン濃度の測定には、日立製作所株式会社製の原子吸光光度計１８０−３０を使用した。以下に測定結果を示す。 In Example 1, as the material properties of the neutralized acidic solution, the hydrogen ion exponent pH (potential Hydrogen), the electrical conductivity EC (Electrical Conductivity), and the contained lead ion concentration were measured. In addition, pH meter HM25R made by Toa DKK Co., Ltd. was used for pH measurement. For measurement of EC, an electrical conductivity meter CM30G manufactured by Toa DKK Co., Ltd. was used. An atomic absorption photometer 180-30 manufactured by Hitachi, Ltd. was used for the measurement of the contained lead ion concentration. The measurement results are shown below.
本実施例１における中和酸性溶液は、pHが０．７５以下、ECが１０Ｓ／ｍ以上、含有イオン濃度が約０．００９ｐｐｍであった。なお、pHについては、pHメーター（ＨＭ２５Ｒ）の下限が０．７５であるため、実際の値は測定範囲を超えていた。また、ECについても、電気伝導度計測器（ＣＭ３０Ｇ）の上限が１０Ｓ／ｍであるため、実際の値は測定範囲を超えていた。 The neutralized acidic solution in Example 1 had a pH of 0.75 or less, an EC of 10 S / m or more, and a contained ion concentration of about 0.009 ppm. In addition, about pH, since the minimum of a pH meter (HM25R) is 0.75, the actual value exceeded the measuring range. In addition, the actual value of EC exceeded the measurement range because the upper limit of the electrical conductivity measuring instrument (CM30G) was 10 S / m.
ところで、バッテリー廃液の廃棄可能なpHは、国の廃棄物処理に関する基準である「廃棄物の処理及び清掃に関する法律施行令に基づく、特別管理一般廃棄物及び特別管理産業廃棄物の処分又は再生の方法として環境大臣が定める方法、第４項ハ」によれば、pHが２〜１２．５内である。このことを踏まえると、本実施形態で使用するバッテリー廃液のpHが０．７５以下を示しているため、このまま土壌に混入することはできない。 By the way, the pH at which battery waste liquid can be disposed of is the standard for waste disposal in the country, which is “disposal or recycling of specially managed general waste and specially controlled industrial waste based on the Law Enforcement Ordinance on Waste Disposal and Cleaning”. According to the method defined by the Minister of the Environment, item 4 c), the pH is within the range of 2 to 12.5. Considering this, since the pH of the battery waste liquid used in the present embodiment indicates 0.75 or less, it cannot be mixed into the soil as it is.
一方、含有鉛イオン濃度は約０．００９ｐｐｍであり、水質汚濁防止法排水基準に基づく基準値である０．１ｐｐｍ以下である。以下に示す表１は、中和酸性溶液内のバッテリー廃液の含有量を変えて、含有イオン濃度を測定した測定値である。 On the other hand, the concentration of contained lead ions is about 0.009 ppm, which is 0.1 ppm or less, which is a reference value based on the water pollution prevention method drainage standard. Table 1 shown below is a measured value obtained by changing the content of the battery waste liquid in the neutralized acidic solution and measuring the contained ion concentration.
表１に示すように、バッテリー廃液の含有量が１０重量％の水溶液における含有イオン濃度は０．０９９ｐｐｍであり、それ以下のバッテリー廃液の含有量の場合は、水質汚濁防止法排水基準に基づく基準値以下であることがわかった。 As shown in Table 1, the concentration of ions contained in an aqueous solution containing 10% by weight of battery waste liquid is 0.099 ppm. If the battery waste liquid content is less than that, the standard based on the water pollution control law drainage standard It was found to be below the value.
以上の結果より、含有鉛イオン濃度の環境負荷を考慮すると、中和酸性溶液におけるバッテリー廃液の含有量は１〜１０重量％が望ましい。 From the above results, considering the environmental load of the contained lead ion concentration, the content of the battery waste liquid in the neutralized acidic solution is preferably 1 to 10% by weight.
『本発明に係る接地抵抗低減剤について』
つぎに、バッテリー廃液の含有量が１重量％の水溶液とホタテの貝殻を用いて接地抵抗低減剤を作成し、物質特性を測定した。
"About the ground resistance reducing agent according to the present invention"
Next, a ground resistance reducing agent was prepared using an aqueous solution containing 1% by weight of the battery waste liquid and a scallop shell, and the material properties were measured.
まず、ホタテの貝殻を粉砕機により、粒径が約４０ｍｍ以下の荒粉砕と、約２０ｍｍ以下の細粉砕の２種類の貝殻粉末を作製した。これら２種類の貝殻粉末４．９５ｋｇと、５Ｌの前記バッテリー廃液の水溶液とを混合し、１時間撹拌して中和させた混合物を生成した。そして、その混合物を蒸発皿に載せて、温度１００℃で約２時間加熱し、水分を蒸発させて本発明に係る接地抵抗低減剤を生成した。 First, scallop shells were crushed by a pulverizer to produce two types of shell powders: coarse pulverization with a particle size of about 40 mm or less and fine pulverization with a particle size of about 20 mm or less. These two kinds of shell powder 4.95 kg and 5 L of the aqueous solution of the battery waste liquid were mixed, and stirred for 1 hour to produce a neutralized mixture. Then, the mixture was placed on an evaporating dish and heated at a temperature of 100 ° C. for about 2 hours to evaporate the water and produce the ground resistance reducing agent according to the present invention.
生成した各接地抵抗低減剤について、pH値、EC値をそれぞれ測定した。また、ダイオネックス社製のイオンクロマトグラフィーにより塩化物イオンと、硫酸イオンの含有量の測定を行った。測定結果を表２に示す。 About each produced | generated ground resistance reducing agent, pH value and EC value were measured, respectively. In addition, the content of chloride ions and sulfate ions was measured by ion chromatography manufactured by Dionex. The measurement results are shown in Table 2.
荒粉砕された貝殻粉末を用いて生成された接地抵抗低減剤では、pHが約８．５４、ECは約３８．５ｍＳ／ｍ、塩化物イオンの含有量は約１．５重量％、硫酸イオンの含有量は約３．０重量％であった。 The ground contact resistance reducing agent produced using coarsely crushed shell powder has a pH of about 8.54, an EC of about 38.5 mS / m, a chloride ion content of about 1.5% by weight, and a sulfate ion. The content of was about 3.0% by weight.
一方、細粉砕された貝殻粉末を用いて生成された接地抵抗低減剤では、pHが約９．１０、ECは約４５．０ｍＳ／ｍ、塩化物イオンの含有量は約２．５重量％、硫酸イオンの含有量は約４．０重量％であった。 On the other hand, in the ground contact resistance reducing agent produced using the finely crushed shell powder, the pH is about 9.10, EC is about 45.0 mS / m, chloride ion content is about 2.5% by weight, The sulfate ion content was about 4.0% by weight.
以上の測定結果より、貝殻粉末の粒径が小さい方がpHがアルカリ性へとより進む傾向があり、ECが大きくなる傾向があると考えられる。このpH８．５４〜９．１０は、前述した国の廃棄可能な基準である２〜１２．５内であるため、土壌に混入しても問題ないレベルである。 From the above measurement results, it can be considered that the smaller the particle diameter of the shell powder, the more the pH tends to become alkaline and the EC tends to increase. This pH of 8.54 to 9.10 is within the range of 2 to 12.5, which is the country's discardable standard described above.
また、塩化物イオンおよび硫酸イオンの含有量はともに４重量％以下であり、土壌に混入しても問題ないレベルであった。 Moreover, the content of both chloride ions and sulfate ions was 4% by weight or less, and even if mixed into the soil, there was no problem.
『本発明に係る接地抵抗低減剤を使用した接地試験について』
次に、本実施形態の接地抵抗低減剤について接地抵抗を測定するため、接地電極の接地工事を行って実測した。接地抵抗低減剤は荒粉砕された貝殻粉末と細粉砕された貝殻粉末とを荒粉砕が約４０重量％と細粉砕が約６０重量％となる割合で混合し、前述した製造方法により製造した。
“About the grounding test using the grounding resistance reducing agent according to the present invention”
Next, in order to measure the ground resistance of the ground resistance reducing agent of the present embodiment, the ground electrode was grounded and actually measured. The ground contact resistance reducing agent was produced by mixing roughly crushed shell powder and finely crushed shell powder in a ratio of about 40% by weight for coarse pulverization and about 60% by weight for fine pulverization.
まず、図２に示すように、約３ｍ間隔でＮｏ．１〜Ｎｏ．５の５カ所に接地電極１を打ち込み、この状態での接地抵抗をウエンナー法により測定した。
First, as shown in FIG. 1-No. The
つぎに、図３に示すように、Ｎｏ．１〜Ｎｏ．５の各箇所の接地電極１の周辺を直径０．４５ｍ、深さ１．５ｍの円筒形に掘削し、その掘削した土に５重量％、１０重量％、１５重量％、２０重量％、２５重量％の割合でそれぞれ前記接地抵抗低減剤を混ぜ合わせて埋め戻した。
Next, as shown in FIG. 1-No. 5 is excavated around the
そして、ウエンナー法を使って、埋め戻し直後、埋め戻し後１時間、埋め戻し後１日、埋め戻し後７日、埋め戻し後１カ月の各経過時間における接地抵抗を測定した。以下の表３に測定結果をまとめる。 Then, using the Wenner method, the ground resistance was measured immediately after backfilling, 1 hour after backfilling, 1 day after backfilling, 7 days after backfilling, and 1 month after backfilling. Table 3 below summarizes the measurement results.
表３は、接地電極１の各設置箇所における大地抵抗率、接地抵抗低減剤の混入前の接地抵抗値、接地抵抗低減剤の混入後の接地抵抗値、および混入前から混入後の接地抵抗値の減少率を示している。
Table 3 shows the earth resistivity at each installation location of the
表３に示すように、いずれの接地箇所においても接地電極１だけの場合に比べると、接地抵抗低減剤を混入することにより接地抵抗が大きく低減している。また、混入直後から埋め戻し７日経過後までは接地抵抗が低下していく傾向があり、その後は安定する傾向を示した。
As shown in Table 3, compared to the case of only the
また、接地抵抗低減剤の混合割合の違いによる接地抵抗の減少率を比較すると、例えば埋め戻し後１カ月のデータで比較すれば、混合割合が１０〜２０重量％の場合に高い減少率になっており、特に混合割合が１５重量％のときに約５６％まで減少し、顕著な減少率を示した。 In addition, when the reduction rate of the ground resistance due to the difference in the mixing ratio of the ground resistance reducing agent is compared, for example, when compared with the data for one month after backfilling, the reduction rate is high when the mixing ratio is 10 to 20% by weight. In particular, when the mixing ratio was 15% by weight, it decreased to about 56%, showing a remarkable reduction rate.
以上の結果によれば、本実施例１の接地抵抗低減剤が、接地抵抗を低減させる効果に優れており、かつ環境負荷が小さいことを実証することができた。 According to the above results, it was demonstrated that the ground resistance reducing agent of Example 1 was excellent in the effect of reducing the ground resistance and had a small environmental load.
１ 接地電極 1 Ground electrode
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