JPH11230927A - Concrete structure capable of detecting defect in coated reinforcing bar and its detecting method - Google Patents
Concrete structure capable of detecting defect in coated reinforcing bar and its detecting methodInfo
- Publication number
- JPH11230927A JPH11230927A JP5272798A JP5272798A JPH11230927A JP H11230927 A JPH11230927 A JP H11230927A JP 5272798 A JP5272798 A JP 5272798A JP 5272798 A JP5272798 A JP 5272798A JP H11230927 A JPH11230927 A JP H11230927A
- Authority
- JP
- Japan
- Prior art keywords
- reinforcing bar
- concrete structure
- detecting
- concrete
- electrode
- 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.)
- Pending
Links
Landscapes
- Reinforcement Elements For Buildings (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、塗装鉄筋の欠陥を
検出できるコンクリート構造物とその検出方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete structure capable of detecting a defect in a painted reinforcing bar and a method for detecting the same.
【0002】[0002]
【従来の技術】鉄筋コンクリート構造物、あるいはプレ
ストレストコンクリート構造物では、鉄筋が腐食する
と、鉄筋自体の断面減少、コンクリートとの付着力の低
下、あるいは腐食生成物によるコンクリートのひび割れ
の発生などの劣化が生じることがある。そのために、鉄
筋の表面にエポキシ樹脂を塗装して鉄筋の防錆効果を著
しく向上させた、いわゆるエポキシ樹脂塗装鉄筋が開発
され利用されている。2. Description of the Related Art In a reinforced concrete structure or a prestressed concrete structure, when the reinforcing bar is corroded, deterioration such as a reduction in the cross section of the reinforcing bar itself, a decrease in the adhesive force with the concrete, or generation of cracks in the concrete due to corrosion products occurs. Sometimes. For this purpose, a so-called epoxy resin coated reinforcing bar, in which the surface of the reinforcing bar is coated with an epoxy resin to significantly improve the rust prevention effect of the reinforcing bar, has been developed and used.
【0003】[0003]
【本発明が解決しようとする課題】従来は、エポキシ樹
脂の塗装工程において、ピンホールを検出する方法はあ
るが、コンクリート内に埋め込んだ後の鉄筋の欠陥部を
検出できるコンクリート構造物、あるいは検出する方法
は開発されていなかった。Conventionally, there is a method of detecting pinholes in an epoxy resin coating process. However, a concrete structure capable of detecting a defective portion of a reinforcing bar after being embedded in concrete, or a concrete structure capable of detecting a defect. The way to do it was not developed.
【0004】本発明は上記したような従来の問題を解決
するためになされたもので、コンクリートを打設した後
において、塗装鉄筋の欠陥を検出できる、コンクリート
構造物とその検出方法を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a concrete structure and a method of detecting the same, which can detect a defect in a coated reinforcing bar after placing concrete. With the goal.
【0005】[0005]
【課題を解決するための手段】上記のような目的を達成
するために、本発明の塗装鉄筋の欠陥を検出できるコン
クリート構造物は、エポキシ樹脂を塗装した鉄筋を埋め
込んだコンクリート構造物において、エポキシ樹脂で被
覆された鉄筋に、検出用の導線を結線し、この検出用の
導線の端部をコンクリートの表面に露出させて構成し
た、塗装鉄筋の欠陥を検出できるコンクリート構造物を
特徴としたものである。In order to achieve the above-mentioned object, a concrete structure capable of detecting a defect in a coated reinforcing bar according to the present invention is a concrete structure in which a reinforcing bar coated with an epoxy resin is embedded. It features a concrete structure that can detect defects in painted rebar by connecting detection wires to resin-coated rebar and exposing the ends of the detection wires to the concrete surface. It is.
【0006】また、本発明の塗装鉄筋の欠陥の検出方法
はエポキシ樹脂を塗装した鉄筋を埋め込んだコンクリー
ト構造物において、コンクリートの一部を剥離してエポ
キシ樹脂で被覆された鉄筋を露出させ、この露出部に検
出用導線を結線し、この検出用導線を電位差計に結線
し、電位差計には別に照合のために電極を結線し、照合
電極をコンクリート表面に接触させて行う、塗装鉄筋の
欠陥の検出方法を特徴としたものである。Further, in the method for detecting defects in a coated reinforcing bar according to the present invention, in a concrete structure in which a reinforcing bar coated with an epoxy resin is embedded, a part of the concrete is peeled off to expose the reinforcing bar coated with the epoxy resin. Detecting wire is connected to the exposed part, this detecting wire is connected to a potentiometer, an electrode is connected to the potentiometer separately for verification, and the verification electrode is brought into contact with the concrete surface. Is characterized by the detection method of
【0007】[0007]
【本発明の実施の態様】以下図面を参照しながら本発明
の塗装鉄筋の欠陥を検出できるコンクリート構造物とそ
の検出方法の実施例について説明する。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a concrete structure capable of detecting a defect in a coated steel bar according to the present invention, and a method of detecting the same.
【0008】<イ>コンクリート構造物。 図1に示す1は、エポキシ樹脂2を塗装した鉄筋3を埋
め込んだコンクリート構造物である。エポキシ樹脂2で
被覆された鉄筋3の一部のエポキシ樹脂2被覆を除去
し、その露出部に検出用の導線4を結線する。この結線
部分が欠陥部として検出されないように、エポキシ樹脂
2と同等以上の防錆効果を有する材料8によって保護し
ておく。この検出用の導線4の端部5を長く引き出した
状態でコンクリートを打設してコンクリート構造物1を
完成する。なおこの検出用の導線4は、それ自体が腐食
したり、あるいは鉄筋3の腐食を促進させることがない
ように、適当な防錆効果を与えたものを使用する。<A> Concrete structure. 1 is a concrete structure in which a reinforcing steel bar 3 coated with an epoxy resin 2 is embedded. A part of the reinforcing bar 3 covered with the epoxy resin 2 is removed, and a lead 4 for detection is connected to the exposed portion. The connection portion is protected by a material 8 having a rust prevention effect equal to or higher than that of the epoxy resin 2 so as not to be detected as a defective portion. Concrete is cast in a state where the end portion 5 of the detection conducting wire 4 is pulled out long, and the concrete structure 1 is completed. The detection conductor 4 is provided with an appropriate rust-preventing effect so that the conductor 4 itself does not corrode or accelerate the corrosion of the reinforcing bar 3.
【0009】<ロ>鉄筋を露出させる方法。 図1の実施例は、コンクリート構造物1の構築時に事前
に欠陥検出用の導線4を埋設しておく方法であった。し
かし図2に示すように、導線4を事前に埋設していない
場合には、コンクリートの一部を剥離して、エポキシ樹
脂2を露出させる。剥離したコンクリート部分は、適当
な方法によって断面修復を行う。そしてエポキシ樹脂2
の被覆を剥離して、鉄筋3を露出させる。この鉄筋3露
出部分に導線4を固定し、導線4の他端をコンクリート
構造物1の外部に引き出す。<B> A method of exposing a reinforcing bar. The embodiment shown in FIG. 1 is a method in which a conductor 4 for detecting a defect is buried in advance when the concrete structure 1 is constructed. However, as shown in FIG. 2, when the conductor 4 is not buried in advance, a part of the concrete is peeled off to expose the epoxy resin 2. The exfoliated concrete part is repaired in cross section by an appropriate method. And epoxy resin 2
Is peeled off to expose the reinforcing bar 3. The conductor 4 is fixed to the exposed portion of the reinforcing bar 3, and the other end of the conductor 4 is drawn out of the concrete structure 1.
【0010】<ハ>検出方法。 エポキシ樹脂2を塗装した鉄筋3の欠陥を検出するに際
しては、検出用導線4を電位差計5に結線する。さらに
電位差計5には別に照合のために照合電極6を結線す
る。照合電極6としては、硫酸銅電極、飽和カロメル電
極、飽和塩化銀電極、鉛電極などの電極を使用すること
ができる。この照合電極6の先端をスポンジなどの保護
材7で保護した状態でコンクリート構造物1の表面に接
触させて検出を行う。なお、照合電極6は、保護材7で
保護したタイプのほかに、回転式で連続的に測定可能な
タイプもあり、これによっても検出が可能である。<C> Detection method When detecting a defect in the reinforcing bar 3 coated with the epoxy resin 2, the detecting lead 4 is connected to a potentiometer 5. Further, a reference electrode 6 is separately connected to the potentiometer 5 for comparison. As the reference electrode 6, an electrode such as a copper sulfate electrode, a saturated calomel electrode, a saturated silver chloride electrode, or a lead electrode can be used. The detection is performed by bringing the tip of the reference electrode 6 into contact with the surface of the concrete structure 1 in a state where the tip is protected by a protective material 7 such as sponge. In addition to the type protected by the protective material 7, the reference electrode 6 includes a rotary type that can be continuously measured, and can also be detected by this.
【0011】<ニ>検出結果。 電位差計5の照合電極6の先端をコンクリート構造物1
の表面に接触させると、エポキシ樹脂2の塗装に欠陥が
あると、その部分では鉄筋3が自然電位を示す。 その
ために電位差計5が、ある値を示すことになる。欠陥が
ない位置では鉄筋3とコンクリート構造物1の表面とは
絶縁状態となる。そのために電位差計5の電位はほぼゼ
ロに近い値を示す。このように電位差計5によって、あ
る位置において急激な電位の変化が見られれば、その位
置付近でコンクリート内部のエポキシ樹脂2に欠陥があ
ることを検出できる。<D> Detection result. Connect the tip of the reference electrode 6 of the potentiometer 5 to the concrete structure 1
When the coating of the epoxy resin 2 has a defect when the surface is contacted, the reinforcing bar 3 shows a spontaneous potential at that portion. Therefore, the potentiometer 5 shows a certain value. In a position where there is no defect, the reinforcing bar 3 and the surface of the concrete structure 1 are in an insulated state. Therefore, the potential of the potentiometer 5 shows a value close to zero. If a sudden change in potential is observed at a certain position by the potentiometer 5 in this way, it can be detected that the epoxy resin 2 inside the concrete has a defect near that position.
【0012】[0012]
【本発明の効果】本発明の塗装鉄筋の欠陥を検出できる
コンクリート構造物とその検出方法は以上説明したよう
になるから次のような効果を得ることができる。 <イ>従来はエポキシ樹脂の塗装過程においてピンホー
ルや傷などの欠陥部を検出するだけであり、コンクリー
ト構造物に埋設してしまった塗装鉄筋の欠陥を検出する
方法がなかった。しかし本発明の構造物を採用し、ある
いは検出方法を採用すれば、コンクリート内部のエポキ
シ樹脂塗装鉄筋の欠陥部を検出することができる。 <ロ>欠陥部を外部から検出することによって、維持管
理を重点的に行う箇所を早期に特定することができる。
したがって構造物の信頼性を長く維持することができ
る。 <ハ>コンクリート構造物を供用中にも、破壊すること
なく欠陥部の腐食の状態を把握、推測することができる
からきわめて経済的である。The concrete structure and the method for detecting a defect of a coated reinforcing bar according to the present invention have been described above, and the following effects can be obtained. <A> Conventionally, only a defective portion such as a pinhole or a scratch is detected in the process of coating an epoxy resin, and there is no method for detecting a defect of a coated reinforcing bar buried in a concrete structure. However, if the structure of the present invention is employed or the detection method is employed, it is possible to detect a defective portion of the epoxy resin-coated reinforcing bar inside the concrete. <B> By detecting a defective portion from the outside, it is possible to early identify a portion where maintenance and management are to be focused.
Therefore, the reliability of the structure can be maintained for a long time. <C> Even during the operation of the concrete structure, the state of corrosion of the defective portion can be grasped and estimated without breaking, which is extremely economical.
【図1】エポキシ樹脂を塗装した鉄筋の欠陥を検出でき
るコンクリート構造物の実施例の説明図。FIG. 1 is an explanatory view of an embodiment of a concrete structure capable of detecting a defect of a reinforcing bar coated with an epoxy resin.
【図2】検出方法の実施例の説明図。FIG. 2 is an explanatory diagram of an embodiment of a detection method.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 堀口 賢一 東京都新宿区西新宿一丁目25番1号 大成 建設株式会社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenichi Horiguchi 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation
Claims (3)
コンクリート構造物において、 エポキシ樹脂で被覆された鉄筋に、検出用の導線を結線
し、 この検出用の導線の端部をコンクリートの表面に露出さ
せて構成した、 塗装鉄筋の欠陥を検出できるコンクリート構造物1. A concrete structure in which a reinforcing bar coated with an epoxy resin is embedded, a detecting wire is connected to the reinforcing bar coated with the epoxy resin, and an end of the detecting wire is exposed on the surface of the concrete. Concrete structures that can detect defects in painted rebar
コンクリート構造物において、 コンクリートの一部を剥離してエポキシ樹脂で被覆され
た鉄筋を露出させ、 この露出部に検出用導線を結線し、 この検出用導線を電位差計に結線し、 電位差計には別に照合のために電極を結線し、 照合電極をコンクリート表面に接触させて行う、 塗装鉄筋の欠陥の検出方法。2. A concrete structure in which a reinforcing bar coated with an epoxy resin is embedded, a part of the concrete is peeled off to expose a reinforcing bar coated with an epoxy resin, and a detecting wire is connected to the exposed portion. A method of detecting defects in painted rebar by connecting a detection conductor to a potentiometer, connecting an electrode to the potentiometer separately for verification, and bringing the reference electrode into contact with the concrete surface.
極などの電極を使用して行う、 請求項2記載の、塗装鉄筋の欠陥の検出方法。3. The method according to claim 2, wherein an electrode such as a copper sulfate electrode, a saturated calomel electrode, a saturated silver chloride electrode, or a lead electrode is used as the reference electrode.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5272798A JPH11230927A (en) | 1998-02-18 | 1998-02-18 | Concrete structure capable of detecting defect in coated reinforcing bar and its detecting method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5272798A JPH11230927A (en) | 1998-02-18 | 1998-02-18 | Concrete structure capable of detecting defect in coated reinforcing bar and its detecting method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH11230927A true JPH11230927A (en) | 1999-08-27 |
Family
ID=12922967
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5272798A Pending JPH11230927A (en) | 1998-02-18 | 1998-02-18 | Concrete structure capable of detecting defect in coated reinforcing bar and its detecting method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH11230927A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008051748A (en) * | 2006-08-28 | 2008-03-06 | Ohbayashi Corp | Salt damage maintenance/management method of concrete structure using epoxy resin-coated reinforcement |
JP2016223917A (en) * | 2015-05-29 | 2016-12-28 | 株式会社マルイ | Rotational sensor and copper electrode |
CN117644230A (en) * | 2024-01-29 | 2024-03-05 | 山东豪迈机械制造有限公司 | Composite board stripping device |
-
1998
- 1998-02-18 JP JP5272798A patent/JPH11230927A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008051748A (en) * | 2006-08-28 | 2008-03-06 | Ohbayashi Corp | Salt damage maintenance/management method of concrete structure using epoxy resin-coated reinforcement |
JP2016223917A (en) * | 2015-05-29 | 2016-12-28 | 株式会社マルイ | Rotational sensor and copper electrode |
CN117644230A (en) * | 2024-01-29 | 2024-03-05 | 山东豪迈机械制造有限公司 | Composite board stripping device |
CN117644230B (en) * | 2024-01-29 | 2024-05-28 | 山东豪迈机械制造有限公司 | Composite board stripping device |
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