JP2866791B2 - Buried reference electrode - Google Patents
Buried reference electrodeInfo
- Publication number
- JP2866791B2 JP2866791B2 JP5318774A JP31877493A JP2866791B2 JP 2866791 B2 JP2866791 B2 JP 2866791B2 JP 5318774 A JP5318774 A JP 5318774A JP 31877493 A JP31877493 A JP 31877493A JP 2866791 B2 JP2866791 B2 JP 2866791B2
- Authority
- JP
- Japan
- Prior art keywords
- electrolyte
- reference electrode
- tube
- electrode
- electrolyte solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、土中またはコンクリー
ト中に埋設される金属構造物の電位を測定するために、
該構造物の近傍部に埋設される照合電極に関する。BACKGROUND OF THE INVENTION The present invention relates to a method for measuring a potential of a metal structure buried in soil or concrete.
The present invention relates to a reference electrode embedded in the vicinity of the structure.
【０００２】[0002]
【従来の技術】土中またはコンクリート中に埋設された
金属構造物の腐食防止に有効な手段として、電気防食法
（陰極防食法）が従来から多用されている。電気防食法
は防食対象となる金属構造物から離して陽極を接地さ
せ、金属構造物を陰極として陽極との間に直流電流を連
続的に供給することにより、金属構造物を陰分極させ、
その電位を、腐食反応が完全に停止する防食電位以下に
維持する方法である。2. Description of the Related Art As a means effective for preventing corrosion of a metal structure buried in soil or concrete, a cathodic protection method (cathodic protection method) has been frequently used. In the cathodic protection method, the anode is grounded away from the metal structure to be protected, and the metal structure is negatively polarized by continuously supplying a direct current between the anode and the metal structure as a cathode.
In this method, the potential is maintained at or below the anticorrosion potential at which the corrosion reaction stops completely.
【０００３】この種の電気防食法では、防食対象である
金属構造物の電位を計測することにより防食効果の判定
ができるため、電位計測が定期的に行われる。金属構造
物の電位は、その近傍の土壌、コンクリート表面、コン
クリート表面に接する土壌あるいは金属構造物直上の土
壌に、基準となる照合電極を設置し、電位差計の＋端子
に金属構造物を、−端子に照合電極を接続して測定され
る。In this type of cathodic protection method, the anticorrosion effect can be determined by measuring the electric potential of a metal structure to be anticorrosion target, so that the electric potential measurement is performed periodically. The potential of the metal structure is measured by installing a reference electrode on the soil, concrete surface, soil in contact with the concrete surface, or soil immediately above the metal structure, and connecting the metal structure to the + terminal of the potentiometer. Measured by connecting a reference electrode to the terminal.
【０００４】この場合、設置した照合電極の近傍部の電
位が測定されるため、照合電極を移動させることにより
電位の分布を知ることもできる。また、電気防食を適用
していない埋設金属構造物の場合では、マクロセル腐食
の有無を定性的に判断する目的で、電位分布の測定が行
われることもある。In this case, since the potential in the vicinity of the installed reference electrode is measured, the potential distribution can be known by moving the reference electrode. In the case of a buried metal structure to which no cathodic protection is applied, the potential distribution may be measured for the purpose of qualitatively determining the presence or absence of macrocell corrosion.
【０００５】しかし、金属構造物の直上の地表が広範囲
に亙って舗装されている場合や、地上設置式タンクの底
板中央部付近の電位は、照合電極を金属構造物の近傍部
に設置することが不可能であるため、上記の方法では測
定できない。このため、金属構造物の近傍部に長期間使
用可能な埋設式照合電極を予め埋設し、そのリード線を
地上部に設けた測定用ボックスまで配線しておくことに
より、測定を可能とする方法が採られている。[0005] However, when the ground surface directly above the metal structure is paved over a wide area or when the potential near the center of the bottom plate of the above-ground tank is set, the reference electrode is installed near the metal structure. It is not possible to measure with the above method because it is impossible. For this reason, a method that enables measurement by previously burying a buried type reference electrode that can be used for a long time in the vicinity of the metal structure and wiring the lead wire to the measurement box provided on the ground part Is adopted.
【０００６】この種の埋設式照合電極のうち、土中埋設
用としては、高純度亜鉛棒をバックフィルと呼ばれる石
膏とベントナイトを主成分とする粉末で包んだ亜鉛照合
電極や、純銅棒を液絡部を有するケーシング内に収納
し、このケーシング内部に飽和硫酸銅溶液あるいは飽和
硫酸銅溶液を含有する石膏またはペースト等を充填した
飽和硫酸銅照合電極が実用化されている。また、コンク
リートへの埋設用としては、液絡部を有するケーシング
内に純鉛棒を収納し、前記ケーシング内部に水酸化カル
シウムを主成分としたアルカリ性電解質を含む石膏また
はペーストを充填した鉛照合電極が実用化されている。[0006] Of the buried type reference electrodes of this type, for burial in the soil, a zinc reference electrode in which a high-purity zinc rod is wrapped with a powder mainly composed of gypsum and bentonite called a backfill, or a pure copper rod is used as a liquid. A saturated copper sulfate reference electrode which is housed in a casing having a entangled portion and filled with a saturated copper sulfate solution or a gypsum or paste containing the saturated copper sulfate solution has been put to practical use. Further, for embedding in concrete, a lead reference electrode in which a pure lead rod is housed in a casing having a liquid junction, and a gypsum or paste containing an alkaline electrolyte containing calcium hydroxide as a main component is filled in the casing. Has been put to practical use.
【０００７】[0007]
【発明が解決しようとする課題】上記の亜鉛照合電極、
飽和硫酸銅照合電極および鉛照合電極によれば、電極内
部の金属が接触する電解質の濃度および量を一定範囲内
に保つ限りは電極電位が一定値に維持されるが、電解質
が土壌中へ散逸したり、または土壌中の水分が電極内部
に侵入すると、電極電位は本来の値と異なり基準電極と
しての機能が失われる。The above zinc reference electrode,
According to the saturated copper sulfate reference electrode and the lead reference electrode, the electrode potential is maintained at a constant value as long as the concentration and amount of the electrolyte in contact with the metal inside the electrode are kept within a certain range, but the electrolyte dissipates into the soil If the water content in the electrode falls or the moisture in the soil enters the inside of the electrode, the electrode potential is different from the original value and the function as the reference electrode is lost.
【０００８】そこで、この不利益を抑制するため、透水
性の低い多孔質材料からなる液絡部や、透水性の低いベ
ントナイトのバックフィル材も用いられているが、含水
率が常時低い土壌中では徐々に液絡部から電解質が流出
して充填物質中に含まれる電解質溶液量が低下したり、
逆に、地下水流が存在する土壌中では、電極内部あるい
はバックフィル中の電解質が希釈されることが避けられ
なかった。したがって、長期間にわたり一定の電極電位
を維持することは困難だった。In order to suppress such disadvantages, a liquid junction made of a porous material having low water permeability and a backfill material of bentonite having low water permeability have been used. Then, the electrolyte gradually flows out from the liquid junction and the amount of the electrolyte solution contained in the filling substance decreases,
Conversely, in the soil where the groundwater flow exists, it was inevitable that the electrolyte inside the electrode or in the backfill was diluted. Therefore, it has been difficult to maintain a constant electrode potential for a long period of time.
【０００９】また、照合電極に共通する事柄であるが、
測定系の抵抗を計器許容入力抵抗以下に保つためには照
合電極と接する土壌が湿潤していることが必要である。
通常の設置方法においては、雨水あるいは地下水の浸透
により水分が照合電極の周囲に補給されるため問題はな
いが、前述したような盛土基礎上に設置された大型タン
クの底板下部や、地下水位が低くかつ地表面が広範囲に
舗装された土中においては、時間の経過とともに照合電
極の周囲の土壌の含水率が低下するため、照合電極の接
地抵抗が徐々に上昇して、ついには電位測定が困難にな
るという問題点があった。特に、融点の高い物質を貯蔵
するような常時加熱されるタンクの底板直下部に設置さ
れた場合には、設置後１ないし３年で照合電極が使用不
能になることが多かった。[0009] Further, a common matter of the reference electrode is as follows.
In order to keep the resistance of the measuring system below the allowable input resistance of the meter, it is necessary that the soil in contact with the reference electrode is moist.
In the normal installation method, there is no problem because water is supplied around the reference electrode by rainwater or groundwater infiltration, but the lower part of the bottom plate of the large tank installed on the embankment foundation and the groundwater level In soil that is low and has a wide ground surface, the water content of the soil around the reference electrode decreases over time, so that the ground resistance of the reference electrode gradually increases, and the potential measurement eventually ends. There was a problem that it became difficult. In particular, in the case where the reference electrode is installed immediately below the bottom plate of a constantly heated tank for storing a substance having a high melting point, the reference electrode often becomes unusable one to three years after the installation.
【００１０】本発明は上記事情に鑑みてなされたもの
で、埋設された照合電極内部に外部から電解質溶液を供
給可能とすることにより、電極本体の電位の安定化を図
るとともに電極接地抵抗の上昇を抑制でき、長期間の使
用が可能な埋設式照合電極を提供することを課題として
いる。[0010] The present invention has been made in view of the above circumstances, and by enabling the electrolyte solution to be supplied from the outside to the embedded reference electrode, the potential of the electrode body is stabilized and the ground resistance of the electrode is increased. It is an object of the present invention to provide a buried type reference electrode which can suppress the problem and can be used for a long time.
【００１１】[0011]
【課題を解決するための手段】本発明に係る埋設式照合
電極は、少なくとも一部に液浸透性を有する外包体と、
この外包体の内部に充填され電解質溶液を含有する充填
物質と、前記外包体内で前記充填物質に接触して配置さ
れた電極本体と、一端がこの電極本体に接続され他端が
外包体を貫通して外部に延ばされることにより測定機器
に接続可能とされた電線と、一端が前記外包体内に連通
し他端が外部に延ばされることにより電解液供給手段に
接続可能とされた電解液供給管とを具備し、この電解液
供給管を介して前記電解液供給手段から前記外包体内に
電解質溶液を供給可能とされていることを特徴としてい
る。According to the present invention, there is provided a buried type reference electrode comprising at least a part of a liquid permeable outer package;
A filling substance filled in the outer package body and containing an electrolyte solution, an electrode body disposed in contact with the filling substance in the outer package body, and one end connected to the electrode body and the other end penetrating the outer package body An electric wire that can be connected to a measuring instrument by being extended to the outside, and an electrolyte supply pipe that has one end connected to the outer package and the other end extended to the outside so that it can be connected to electrolyte supply means. And an electrolyte solution can be supplied from the electrolyte solution supply means into the outer package through the electrolyte solution supply pipe.
【００１２】なお、前記構成に加えて、一端が前記外包
体内に連通し他端が外部に延ばされる電解液排出管を設
け、外包体内に供給された電解質溶液の過剰分を前記電
解液排出管を通じて排出可能としてもよい。また、一端
が前記外包体内に連通し他端が外部に延ばされた、内管
および外管とからなる二重管を設け、この二重管の外管
と内管の間隙または内管の一方を前記電解液供給管とし
て使用し、他方を前記電解液排出管として使用してもよ
い。さらに、前記電解液供給管にはフィラメントを充填
してもよい。In addition, in addition to the above-mentioned structure, an electrolyte discharge pipe is provided, one end of which is communicated with the outer package and the other end is extended to the outside, and an excess amount of the electrolyte solution supplied into the outer package is supplied to the electrolyte discharge pipe. It may be possible to discharge through. In addition, a double pipe having an inner pipe and an outer pipe, one end of which is communicated with the outer package and the other end of which is extended outside, is provided, and the gap between the outer pipe and the inner pipe of the double pipe or the inner pipe is provided. One may be used as the electrolyte supply pipe and the other may be used as the electrolyte discharge pipe. Further, the electrolyte supply pipe may be filled with a filament.
【００１３】[0013]
【作用】本発明に係る埋設式照合電極によれば、電解液
供給管を通じて、埋設された照合電極内部に外部から電
解質溶液を適時供給することにより、電極本体の電位の
安定化を図ることができるとともに、埋設式照合電極の
接地抵抗を許容範囲内に維持することができ、照合電極
の機能の安定化および耐用年数を飛躍的に延長すること
が可能である。According to the buried type reference electrode of the present invention, the potential of the electrode body can be stabilized by supplying an electrolyte solution from the outside to the inside of the buried reference electrode through the electrolyte supply pipe in a timely manner. Besides, the ground resistance of the buried type reference electrode can be maintained within an allowable range, and the function of the reference electrode can be stabilized and its service life can be greatly extended.
【００１４】また、請求項２に係る埋設式照合電極によ
れば、外包体内に供給された電解質溶液の過剰分を電解
液排出管を通じて排出することにより、埋設式照合電極
内部の電解質溶液を適宜交換することが可能となり、地
下水等による電解質溶液の濃度変化を防いで、基準電位
をいっそう安定化することができる。Further, according to the embedded reference electrode according to the second aspect, by discharging an excess amount of the electrolyte solution supplied into the outer casing through the electrolyte discharge pipe, the electrolyte solution inside the embedded reference electrode can be appropriately removed. It is possible to exchange the electrolyte solution, thereby preventing a change in the concentration of the electrolyte solution due to groundwater or the like, and further stabilizing the reference potential.
【００１５】さらに、請求項３または４記載の埋設式照
合電極によれば、電解液供給管（および電解液排出管）
が潰れにくくなるので、潰れによる電解質溶液の供給困
難を防止することが可能である。Further, according to the embedded reference electrode according to the third or fourth aspect, the electrolyte supply pipe (and the electrolyte discharge pipe).
Is difficult to be crushed, so that it is possible to prevent the supply of the electrolyte solution due to the crushing.
【００１６】[0016]
【実施例】図１は、本発明に係る埋設式照合電極の第１
実施例として、バックフィル充填型の亜鉛照合電極を示
す断面図である。図中符号２はリード線（電線）１が接
続された亜鉛棒（電極本体）であり、リード線１の他端
は外部へと延ばされている。亜鉛棒２とリード線１の接
続部分は、プラスチック等からなる電極固定部７に埋め
込まれて補強され、電極固定部７の亜鉛棒２側には、亜
鉛棒２の一部を覆うようにスポンジ状等の絶縁性多孔質
材料からなる液保持部８が固定されている。1 shows a first embodiment of a buried type reference electrode according to the present invention.
FIG. 3 is a cross-sectional view showing a backfill-filled zinc reference electrode as an example. In the figure, reference numeral 2 denotes a zinc rod (electrode main body) to which a lead wire (electric wire) 1 is connected, and the other end of the lead wire 1 extends to the outside. The connecting portion between the zinc rod 2 and the lead wire 1 is reinforced by being embedded in an electrode fixing portion 7 made of plastic or the like, and a sponge is provided on the zinc rod 2 side of the electrode fixing portion 7 so as to cover a part of the zinc rod 2. A liquid holding portion 8 made of an insulating porous material having a shape such as a shape is fixed.
【００１７】電極固定部７には、亜鉛棒２の両側におい
て、プラスチック等からなる電解液供給管５および電解
液排出管６の一端部が埋設され、これらの先端開口部が
液保持部８内に挿入されている。このような液保持部８
を設けると、液保持部８内で電解質溶液が分散されて液
保持部８の広い外面から均一に拡散されるので、電解質
溶液の供給効率および排出効率を高めることができる。
一方、電解液供給管５および電解液排出管６の他端部
は、リード線１とともに外部へ延ばされ、地上等におい
て電解液供給手段（図示略）に接続可能とされている。One end of an electrolytic solution supply pipe 5 and an electrolytic solution discharge pipe 6 made of plastic or the like are embedded in the electrode fixing section 7 on both sides of the zinc rod 2. Has been inserted. Such a liquid holding unit 8
Is provided, the electrolyte solution is dispersed in the liquid holding unit 8 and uniformly diffused from the wide outer surface of the liquid holding unit 8, so that the supply efficiency and the discharge efficiency of the electrolyte solution can be improved.
On the other hand, the other end portions of the electrolyte supply pipe 5 and the electrolyte discharge pipe 6 are extended to the outside together with the lead wire 1 so that they can be connected to an electrolyte supply means (not shown) on the ground or the like.
【００１８】亜鉛棒２、電極固定部７および液保持部８
を包囲して布袋（外包体）４が設けられ、この布袋４内
には、電解質溶液を含んだベントナイトを主成分とする
バックフィル（充填物質）３が充填され、このバックフ
ィル３内に亜鉛棒２が浸漬されている。この場合の電解
質溶液としては、ｐＨ８〜９に調整された硫酸ナトリウ
ムを主成分とする溶液が適合する。Zinc rod 2, electrode fixing part 7, and liquid holding part 8
Is provided with a backfill (filling substance) 3 containing bentonite as a main component containing an electrolyte solution, and the backfill 3 is provided with zinc. The rod 2 is immersed. As the electrolyte solution in this case, a solution mainly containing sodium sulfate adjusted to pH 8 to 9 is suitable.
【００１９】上記構成からなる埋設式照合電極では、電
解液供給管５を通じて外部から電解質溶液を布袋４内に
供給することにより、バックフィル３を適当な濃度の電
解質溶液で湿潤化し、さらに布袋４を通じて土壌中に電
解質溶液を拡散させることができる。したがって、含水
率が低い土壌中で徐々に電解質溶液が流出することが避
けられない場合や、地下水によりバックフィル３中の電
解質が希釈されてしまう場合にも、新たな電解質溶液の
供給により電極電位を再び安定化できるとともに、亜鉛
棒２と土壌と間に導通状態を確保して接地抵抗を許容範
囲内に維持でき、照合電極の機能の安定化および耐用年
数を飛躍的に延長することが可能である。In the buried type reference electrode having the above-described structure, the backfill 3 is wetted with an appropriate concentration of the electrolyte solution by supplying the electrolyte solution from the outside into the cloth bag 4 through the electrolyte solution supply pipe 5, and the cloth bag 4 The electrolyte solution can be diffused into the soil through. Therefore, even when it is unavoidable that the electrolyte solution gradually flows out in the soil having a low moisture content, or when the electrolyte in the backfill 3 is diluted by groundwater, the supply of the new electrolyte solution causes the electrode potential to decrease. And the grounding resistance can be maintained within the allowable range by ensuring conduction between the zinc rod 2 and the soil, stabilizing the function of the reference electrode and dramatically extending its useful life. It is.
【００２０】また、供給された電解質溶液の過剰分を電
解液排出管６を通じて排出することにより、埋設式照合
電極内部の電解質溶液を効率よく交換することが可能で
あるから、例えば地下水の流入で電解質溶液が希釈され
た場合や、脱水により濃縮された場合にも、その濃度を
復帰させることが容易であるという利点を有する。Further, by discharging the excess of the supplied electrolyte solution through the electrolyte discharge pipe 6, the electrolyte solution inside the buried type reference electrode can be efficiently exchanged. There is an advantage that it is easy to restore the concentration even when the electrolyte solution is diluted or concentrated by dehydration.
【００２１】なお、電極本体、充填物質および電解質溶
液の種類は、埋設式照合電極の使用目的に応じて適宜変
更してよいのは勿論であり、他の構成もそれに対応して
変更してよい。また、もしも電解質溶液の土壌への流出
量と外部からの供給量を適当範囲に管理できるのであれ
ば、電解液排出管６は省略してもよい。It is needless to say that the types of the electrode body, the filling substance, and the electrolyte solution may be appropriately changed according to the purpose of use of the embedded reference electrode, and other configurations may be changed accordingly. . Further, if the flow rate of the electrolyte solution into the soil and the supply rate from the outside can be controlled within appropriate ranges, the electrolyte discharge pipe 6 may be omitted.
【００２２】図２は、本発明の第２実施例として、飽和
溶液タイプの飽和硫酸銅照合電極に適用した例を示す断
面図である。符号１０は純銅またはタフピッチ銅等の銅
棒（電極本体）１０であり、外部へ連なるリード線（電
線）２０が接続されている。銅棒１０は樹脂等の絶縁材
からなるパイプ１２に収容され、パイプ１２の先端開口
部は液浸透性を有する多孔質セラミックス等からなる浸
透板１１で封止される一方、パイプ１２の基端開口部は
電極固定部１９で封止され、この電極固定部１９により
銅棒１０とリード線２１の接続部が支持されている。FIG. 2 is a sectional view showing an example in which the present invention is applied to a saturated solution type saturated copper sulfate reference electrode as a second embodiment of the present invention. Reference numeral 10 denotes a copper rod (electrode main body) 10 such as pure copper or tough pitch copper, to which a lead wire (electric wire) 20 connected to the outside is connected. The copper rod 10 is accommodated in a pipe 12 made of an insulating material such as a resin, and the opening at the distal end of the pipe 12 is sealed with a penetrating plate 11 made of a porous ceramic having liquid permeability. The opening is sealed by an electrode fixing portion 19, and the connecting portion between the copper bar 10 and the lead wire 21 is supported by the electrode fixing portion 19.
【００２３】電極固定部１９を貫通して、一端がパイプ
１２内に連通し他端が外部に延びた電解液供給管１７お
よび電解液排出管１８が設けられ、パイプ１２の内部に
は硫酸銅結晶１４を含む飽和硫酸銅溶液（充填物質の一
部）１３が満たされている。さらに、パイプ１２は全体
が布袋１６で包囲され、この布袋１６の内部には、電解
質溶液を含むベントナイトを主成分とするバックフィル
（充填物質）１５が充填されている。An electrolytic solution supply pipe 17 and an electrolytic solution discharge pipe 18 having one end communicating with the inside of the pipe 12 and the other end extending outside are provided through the electrode fixing portion 19. A saturated copper sulphate solution (part of the filling material) 13 containing crystals 14 is filled. Further, the pipe 12 is entirely surrounded by a cloth bag 16, and the inside of the cloth bag 16 is filled with a backfill (filling substance) 15 mainly composed of bentonite containing an electrolyte solution.
【００２４】この第２実施例においても、電解液供給管
１７を通じて外部から電解質溶液を供給することによ
り、パイプ１２内の電解質溶液１３の減少を補うととも
に、浸透板１１を通じて流出した電解質溶液でバックフ
ィル１５を湿潤化し、さらに布袋１６を通じて土壌中に
電解質溶液を拡散させることができる。これにより、銅
棒１０の電位安定化が図れ、埋設式照合電極の接地抵抗
を許容範囲内に維持することができ、照合電極の機能の
安定化および耐用年数を飛躍的に延長することが可能で
ある。Also in the second embodiment, the electrolyte solution is supplied from the outside through the electrolyte supply pipe 17, thereby compensating for the decrease of the electrolyte solution 13 in the pipe 12 and backing up with the electrolyte solution flowing out through the permeation plate 11. The fill 15 can be moistened and the electrolyte solution can be diffused into the soil through the cloth bag 16. As a result, the potential of the copper rod 10 can be stabilized, the ground resistance of the buried type reference electrode can be maintained within an allowable range, and the function of the reference electrode can be stabilized and its service life can be significantly extended. It is.
【００２５】なお、図１および図２のいずれにおいて
も、電解液供給管５，１７および電解液排出管６，１８
が折れ曲がって電解質溶液が円滑に流れなくなるのを防
ぐために、管５，６，１７，１８の全長または一部の内
部に、樹脂等のフィラメントを適当な本数挿入してもよ
い。この場合のフィラメントは、例えば単繊維の細糸な
どであり、ＰＶＣまたはＰＥ等の電線被覆材料よりも軟
化点の高い樹脂が好ましい。このようなフィラメントを
入れると、管５，１７，６，１８が折れ曲がりにくくな
るし、たとえ折れ曲がったとしてもフィラメントの間を
通って電解質溶液が流れるため、閉塞することがない。In both FIGS. 1 and 2, the electrolyte supply pipes 5, 17 and the electrolyte discharge pipes 6, 18
In order to prevent the electrolyte solution from flowing smoothly and preventing the electrolyte solution from flowing smoothly, an appropriate number of filaments such as a resin may be inserted into the entire length or a part of the tubes 5, 6, 17, and 18. The filament in this case is, for example, a single-filament fine thread, and a resin having a softening point higher than that of an electric wire coating material such as PVC or PE is preferable. When such a filament is inserted, the tubes 5, 17, 6, and 18 are less likely to bend, and even if the tube is bent, the electrolyte solution flows between the filaments, so that the tubes do not block.
【００２６】次に、図３は本発明の第３実施例を示し、
この例では、互いに独立した電解液供給管および電解液
排出管を設ける代わりに、外管２２Ａおよび内管２２Ｂ
からなる二重管２２を使用したことを特徴とし、その他
の構成は図１の実施例と同様である。二重管２２の一端
は電極固定部７を貫通して液保持部８内に達し、二重管
２２の他端は外部へ延ばされている。そして、内管２２
Ｂを通じて電解質溶液を供給する一方、外管２２Ａと内
管２２Ｂの間隙を通じて電解質溶液を排出するようにな
っている。FIG. 3 shows a third embodiment of the present invention.
In this example, the outer pipe 22A and the inner pipe 22B are provided instead of providing an independent electrolyte supply pipe and electrolyte discharge pipe.
The structure is the same as that of the embodiment shown in FIG. One end of the double tube 22 penetrates through the electrode fixing portion 7 and reaches the inside of the liquid holding portion 8, and the other end of the double tube 22 extends to the outside. And the inner pipe 22
While supplying the electrolyte solution through B, the electrolyte solution is discharged through the gap between the outer tube 22A and the inner tube 22B.
【００２７】この第３実施例では、二重管２２が屈曲し
にくいことから、屈曲による流路閉塞のおそれが少ない
うえ、管が１本ですむので配管が容易であるという利点
を有する。二重管２２を用いた構成は、図２の実施例に
も勿論適用可能である。In the third embodiment, since the double pipe 22 is hardly bent, there is little risk of blockage of the flow path due to the bending, and there is an advantage that the pipe is easy because only one pipe is required. The configuration using the double pipe 22 is of course applicable to the embodiment of FIG.
【００２８】（実験例）次に、本発明の実験例を挙げて
発明の効果を実証する。図３は、実験に使用した設備を
示し、符号２３は防食対象となるアスファルト貯蔵タン
ク（金属構造物）である。このタンク２３は、清浄な川
砂で構築された基礎２４上に設置され、タンク外周部に
は、コンクリート２５およびコーキング２６で雨水等の
侵入を防ぐための防水処理が施されている。タンク２３
の内部は電気ヒータにより常時１８５℃に加温されてい
る。タンク２３の中央部底板の下方０．３ｍの位置に、
本実験例に係る埋設式照合電極２７と、従来式の埋設式
照合電極２８を互いに３ｍ離して設置した。(Experimental Examples) Next, the effects of the present invention will be demonstrated by giving experimental examples of the present invention. FIG. 3 shows equipment used in the experiment, and reference numeral 23 denotes an asphalt storage tank (metal structure) to be subjected to anticorrosion. The tank 23 is installed on a foundation 24 constructed of clean river sand, and the outer peripheral portion of the tank is subjected to a waterproof treatment for preventing intrusion of rainwater and the like by concrete 25 and caulking 26. Tank 23
Is always heated to 185 ° C. by an electric heater. At a position 0.3m below the bottom plate at the center of the tank 23,
The buried type reference electrode 27 according to the present experimental example and the conventional buried type reference electrode 28 were placed 3 m apart from each other.
【００２９】実験例の埋設式照合電極２７の構造を図５
に、また従来の埋設式照合電極２８を図６にそれぞれ示
す。両者とも、電極本体３２として米軍規格（ＭＩＬ
Ａ−１８００１Ｊ：１９８３）による同一の亜鉛棒を用
い、ベントナイト、石膏、硫酸ナトリウム１０水塩を重
量比で７．５：２：０．５に混合したバックフィル３３
を充填した布袋３４に電極本体３２を収容したものであ
る。亜鉛棒の寸法は外径１０ｍｍ×長さ１００ｍｍとし
た。FIG. 5 shows the structure of the buried type reference electrode 27 of the experimental example.
FIG. 6 shows a conventional buried type reference electrode 28, respectively. In both cases, U.S. military standards (MIL
A-18001J: 1983) Backfill 33 in which bentonite, gypsum and sodium sulfate decahydrate were mixed at a weight ratio of 7.5: 2: 0.5 using the same zinc rod.
The electrode body 32 is housed in a cloth bag 34 filled with. The dimensions of the zinc rod were 10 mm in outer diameter × 100 mm in length.
【００３０】一方、実験例の照合電極２７では、電極本
体３２の基端部外周に多孔質樹脂材料からなる液保持部
３５を固定し、この液保持部３５内に、外部へ延びる電
解液供給管３０および電解液排出管３１の先端を差し込
んで固定した。電解液供給管３０および電解液排出管３
１としては、電力用３芯ケーブルのうちの２芯から導線
を除いて樹脂フィラメント３７を充填したものを使用し
た。また、３芯ケーブルの残りの１芯は、電極ケーブル
２９として使用した。実験例電極２７および従来電極２
８は、設置時に予め水道水中に浸漬して十分に湿らせた
後に埋設した。On the other hand, in the reference electrode 27 of the experimental example, a liquid holding portion 35 made of a porous resin material is fixed to the outer periphery of the base end portion of the electrode main body 32, and an electrolytic solution extending to the outside is supplied into the liquid holding portion 35. The ends of the tube 30 and the electrolyte discharge tube 31 were inserted and fixed. Electrolyte supply pipe 30 and electrolyte discharge pipe 3
As 1, a three-core power cable in which a conductor was removed from two cores and filled with a resin filament 37 was used. The remaining one core of the three-core cable was used as the electrode cable 29. Experimental example electrode 27 and conventional electrode 2
8 was buried after being immersed in tap water and moistened sufficiently before installation.
【００３１】設置１年後（タンク完成後８か月後）に各
照合電極２７，２８の接地抵抗を測定した結果、両者と
も約１００ｋΩを示した。電極電位を測定したところ、
別の飽和硫酸銅電極を基準として、従来電極２８は−７
００ｍＶ、本発明電極２７は−７２０ｍＶを示し、標準
値である−１１００±２５ｍＶと比較して約４００ｍＶ
も貴な値であり、基準電極として機能していないことが
確認された。One year after the installation (eight months after the tank was completed), the ground resistance of each of the reference electrodes 27 and 28 was measured. As a result, both of them showed about 100 kΩ. When the electrode potential was measured,
The conventional electrode 28 is -7 with respect to another saturated copper sulfate electrode.
00mV, the electrode 27 of the present invention shows −720 mV, which is about 400 mV compared to the standard value of −1100 ± 25 mV.
Was also a precious value, and it was confirmed that it did not function as a reference electrode.
【００３２】そこで、本発明電極２７の電解液供給管３
０より３％硫酸ナトリウム水溶液をシリンジを用いて２
リットル注入し、３時間放置した時点で再度両者の接地
抵抗および電位を測定した。その結果、従来電極では変
化は認められなかったが、溶液を供給した本発明電極２
７では接地抵抗が０．８ｋΩに低減し、電極電位は飽和
硫酸銅電極基準で−１０８０ｍＶの正常値を示し、機能
回復効果が確認された。また、電解質溶液は必ずしも常
時供給する必要はなく、使用時に先立ち適宜供給すれば
よいことも判明した。Therefore, the electrolyte supply pipe 3 of the electrode 27 of the present invention
0 to 3% aqueous solution of sodium sulfate using a syringe
After the liter was injected and left for 3 hours, the ground resistance and potential of both were measured again. As a result, no change was observed in the conventional electrode, but the electrode 2 of the present invention supplied with the solution
In No. 7, the ground resistance was reduced to 0.8 kΩ, and the electrode potential showed a normal value of −1080 mV based on the saturated copper sulfate electrode, confirming the function recovery effect. It has also been found that the electrolyte solution does not always need to be supplied at all times, but may be supplied appropriately before use.
【００３３】[0033]
【発明の効果】以上説明したように、本発明に係る埋設
式照合電極によれば、電解液供給管を通じて、埋設され
た照合電極内部に外部から電解質溶液を適時供給するこ
とにより、電極本体の電位の安定化を図ることができる
とともに、埋設式照合電極の接地抵抗を許容範囲内に維
持することができ、照合電極の機能の安定化および耐用
年数を飛躍的に延長することが可能である。As described above, according to the buried type reference electrode of the present invention, the electrolyte solution is supplied from the outside to the inside of the buried reference electrode through the electrolyte supply pipe in a timely manner, so that the electrode body is In addition to stabilizing the potential, the ground resistance of the buried type reference electrode can be maintained within an allowable range, so that the function of the reference electrode can be stabilized and its service life can be drastically extended. .
【００３４】また、請求項２に係る埋設式照合電極によ
れば、外包体内に供給された電解質溶液の過剰分を電解
液排出管を通じて排出することにより、埋設式照合電極
内部の電解質溶液を適宜交換することが可能となり、地
下水等による電解質溶液の濃度変化を防いで、基準電位
をいっそう安定化することができる。Further, according to the embedded reference electrode according to the second aspect, by discharging an excess amount of the electrolyte solution supplied into the outer casing through the electrolyte discharge pipe, the electrolyte solution inside the embedded reference electrode can be appropriately removed. It is possible to exchange the electrolyte solution, thereby preventing a change in the concentration of the electrolyte solution due to groundwater or the like, and further stabilizing the reference potential.
【００３５】さらに、請求項３または４記載の埋設式照
合電極によれば、電解液供給管（および電解液排出管）
が潰れにくくなるので、潰れによる電解質溶液の供給困
難を防止することが可能である。Furthermore, according to the embedded reference electrode according to the third or fourth aspect, the electrolyte supply pipe (and the electrolyte discharge pipe).
Is difficult to be crushed, so that it is possible to prevent the supply of the electrolyte solution due to the crushing.
【図１】本発明に係る埋設式照合電極の第１実施例を示
す断面図である。FIG. 1 is a cross-sectional view showing a first embodiment of an embedded reference electrode according to the present invention.
【図２】本発明の第２実施例を示す断面図である。FIG. 2 is a sectional view showing a second embodiment of the present invention.
【図３】本発明の第３実施例を示す断面図である。FIG. 3 is a sectional view showing a third embodiment of the present invention.
【図４】本発明の実験例に使用した金属構造体を示す正
面図である。FIG. 4 is a front view showing a metal structure used in an experimental example of the present invention.
【図５】本発明の実験例として使用した埋設式照合電極
を示す断面図である。FIG. 5 is a cross-sectional view showing an embedded reference electrode used as an experimental example of the present invention.
【図６】従来例として使用した埋設式照合電極を示す断
面図である。FIG. 6 is a sectional view showing a buried type reference electrode used as a conventional example.
１，２０，２９ リード線（電線） ２，１０，３２ 電極本体 ３，１５，３３ バックフィル（充填物質） ４，１６，３４ 布袋（外包体） ５，１７，３０ 電解液供給管 ６，１８，３１ 電解液排出管 ７，１９，３６ 電極固定部 ８，３５ 液保持部 １１ 浸透板 １２ パイプ １３ 電解質溶液（充填物質） ２２ 二重管 ２３ 金属構造体 ３７ フィラメント 1,20,29 Lead wire (electric wire) 2,10,32 Electrode body 3,15,33 Backfill (filling substance) 4,16,34 Cloth bag (outer envelope) 5,17,30 Electrolyte supply pipe 6,18 , 31 Electrolyte discharge tube 7, 19, 36 Electrode fixing part 8, 35 Liquid holding part 11 Penetration plate 12 Pipe 13 Electrolyte solution (filling substance) 22 Double tube 23 Metal structure 37 Filament
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G01N 27/26 351 G01N 17/02 G01N 27/30 311Continuation of the front page (58) Field surveyed (Int.Cl. 6 , DB name) G01N 27/26 351 G01N 17/02 G01N 27/30 311
Claims (4)
属構造物の電位を測定するために前記金属構造物の近傍
に埋設される埋設式照合電極であって、 少なくとも一部が液浸透性を有する外包体と、この外包
体の内部に充填され電解質溶液を含有する充填物質と、
前記外包体内で前記充填物質に接触して配置された電極
本体と、一端がこの電極本体に接続され他端が外包体を
貫通して外部に延ばされることにより測定機器に接続可
能とされた電線と、一端が前記外包体内に連通し他端が
外部に延ばされることにより電解液供給手段に接続可能
とされた電解液供給管とを具備し、この電解液供給管を
介して前記電解液供給手段から前記外包体内に電解質溶
液を供給可能とされていることを特徴とする埋設式照合
電極。A buried reference electrode buried in the vicinity of a metal structure for measuring a potential of the metal structure buried in soil or concrete, at least a part of which has a liquid permeability. An outer package having, a filling material filled inside the outer package and containing an electrolyte solution,
An electrode body disposed in contact with the filling substance in the outer package, and an electric wire having one end connected to the electrode main body and the other end penetrating through the outer package and extending to the outside so as to be connectable to a measuring instrument; And an electrolyte supply pipe, one end of which is connected to the outer package and the other end of which is connected to the electrolyte supply means by extending the other end to the outside. The electrolyte supply pipe is provided through the electrolyte supply pipe. An embedded reference electrode, wherein an electrolyte solution can be supplied into the outer envelope from a means.
延ばされる電解液排出管がさらに設けられ、前記外包体
内に供給された電解質溶液の過剰分を前記電解液排出管
を通じて排出可能とされていることを特徴とする請求項
１記載の埋設式照合電極。2. An electrolyte discharge tube, one end of which is communicated with the outer package and the other end of which is extended outside, is provided, and an excess amount of the electrolyte solution supplied into the outer package can be discharged through the electrolyte discharge tube. The embedded reference electrode according to claim 1, wherein:
延ばされた、内管および外管とからなる二重管が設けら
れ、この二重管の外管と内管の間隙または内管の一方を
前記電解液供給管として使用し、他方を前記電解液排出
管として使用することを特徴とする請求項２記載の埋設
式照合電極。3. A double tube comprising an inner tube and an outer tube, one end of which is communicated with the outer package and the other end of which is extended to the outside, and a gap between the outer tube and the inner tube of the double tube. 3. The embedded reference electrode according to claim 2, wherein one of the inner tubes is used as the electrolyte supply tube and the other is used as the electrolyte discharge tube.
されていることを特徴とする請求項１記載の埋設式照合
電極。4. The buried type reference electrode according to claim 1, wherein said electrolyte supply tube is filled with a filament.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5318774A JP2866791B2 (en) | 1993-12-17 | 1993-12-17 | Buried reference electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5318774A JP2866791B2 (en) | 1993-12-17 | 1993-12-17 | Buried reference electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07174727A JPH07174727A (en) | 1995-07-14 |
| JP2866791B2 true JP2866791B2 (en) | 1999-03-08 |
Family
ID=18102800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5318774A Expired - Fee Related JP2866791B2 (en) | 1993-12-17 | 1993-12-17 | Buried reference electrode |
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| Country | Link |
|---|---|
| JP (1) | JP2866791B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6336405B2 (en) * | 2015-02-02 | 2018-06-06 | 東日本電信電話株式会社 | Cross-sectional area change detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59217147A (en) * | 1983-05-25 | 1984-12-07 | Nippon Kenchiku Sogo Shikenjo | Method and apparatus for inspecting corrosion of steel material in concrete |
| JPH04169843A (en) * | 1990-11-02 | 1992-06-17 | Osaka Gas Co Ltd | Anticorrosion control apparatus for undergound embedded pipe |
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1993
- 1993-12-17 JP JP5318774A patent/JP2866791B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
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