JP2005264571A - Pretreatment method for electric protection work - Google Patents

Pretreatment method for electric protection work Download PDF

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JP2005264571A
JP2005264571A JP2004079019A JP2004079019A JP2005264571A JP 2005264571 A JP2005264571 A JP 2005264571A JP 2004079019 A JP2004079019 A JP 2004079019A JP 2004079019 A JP2004079019 A JP 2004079019A JP 2005264571 A JP2005264571 A JP 2005264571A
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concrete member
short
concrete
circuit
reinforcing bar
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JP4008891B2 (en
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Koji Ishii
浩司 石井
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PS Mitsubishi Construction Co Ltd
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PS Mitsubishi Construction Co Ltd
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  • Prevention Of Electric Corrosion (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To detect whether or not a short-circuit embedded material for imparting electric continuity to a section between an outer surface of a concrete member and a reinforcing bar exists in the concrete member to be subjected to electric protection by an impressed current system. <P>SOLUTION: A broom-like conductive member 11 with flexibility is moved in the state of coming into contact with the outer surface 24 of the concrete member 20 to be subjected to the electric protection; a short circuit between the conductive member 11 and the reinforcing bar 21 in the concrete member 20 is detected; and the anode for the electric protection is mounted in the outer surface 24 of the concrete member 20 or a groove 23 after the removal of the short-circuit embedded material 22 when the embedded material 22 exists in the concrete member 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、電気防食工の事前処理方法に関し、さらに詳しくは外部電源方式の電気防食を施すべきコンクリート部材の外面に、鉄筋と電気的導通がある埋設物の露出部が存在するか否かを検出し、若し存在すれば発見された短絡埋設物を除去した後、電気防食を施すようにした電気防食工の事前処理方法に関する。   The present invention relates to a pretreatment method for an anticorrosion worker, and more specifically, whether or not there is an exposed portion of a buried object having electrical continuity with a reinforcing bar on the outer surface of a concrete member to be subjected to an external power supply type anticorrosion. The present invention relates to a pretreatment method for an anticorrosion worker that detects and, if present, removes a short-circuited buried object, and then performs anticorrosion.

コンクリート構造物に外部電源方式の電気防食技術を施す場合、コンクリート部材の外面又はコンクリート部材の外面に切削等によって形成した溝内に、陽極を装着する。コンクリート中の鉄筋と電気的導通がある埋設物がコンクリート部材の外面または加工した面、例えば上記切削等によって形成した溝内に露出している場合には、陽極がこの埋設物を介して電気的に鉄筋と短絡し、外部電源方式の正常な電気防食回路を形成することが出来ないという問題がある。   In the case of applying an external power supply type anticorrosion technique to a concrete structure, an anode is mounted in the outer surface of the concrete member or in a groove formed by cutting or the like on the outer surface of the concrete member. If a buried object having electrical continuity with a reinforcing bar in concrete is exposed in the outer surface of the concrete member or a processed surface, for example, in a groove formed by the above-described cutting or the like, the anode is electrically connected through the buried object. In addition, there is a problem that a normal electric protection circuit of an external power supply system cannot be formed due to a short circuit with a reinforcing bar.

このようなコンクリート部材中の鉄筋とコンクリート部材の外面との間に電気的に導通のある埋設物を本発明では短絡埋設物と称する。このような短絡埋設物としては、例えば、鉄筋結束線、鉄筋位置保持治具、型枠保持用スペーサ、その他の金属片などがある。このような短絡埋設物が存在するか否かは、従来、技術者がコンクリート部材の外面や切削等によって形成した溝内等を慎重に目視観察することにより発見している。しかし、このような短絡埋設物の目視による発見には困難性が伴い、見逃すことも多く、電気防食技術が妨げられるという問題がある。   In the present invention, such a buried object that is electrically conductive between the reinforcing bar in the concrete member and the outer surface of the concrete member is referred to as a short-circuit buried object. Examples of such a short-circuit embedded object include a reinforcing bar binding wire, a reinforcing bar position holding jig, a mold holding spacer, and other metal pieces. Whether or not such a short-circuit embedded object exists has been discovered by carefully observing the outside of a concrete member or the inside of a groove formed by cutting or the like by a technician. However, the visual discovery of such short-circuited buried objects is difficult and often overlooked, and there is a problem that the anticorrosion technology is hindered.

外部電源方式の電気防食技術については、チタン電極を用いるすぐれた技術がある。(例えば、特許文献1参照。)。
特開2001−11666号公報(第2−3頁、図4)
As for the external anticorrosion technology, there is an excellent technology using a titanium electrode. (For example, refer to Patent Document 1).
JP 2001-11666 (page 2-3, FIG. 4)

本発明は、外部電源方式の電気防食を施すべきコンクリート部材中にコンクリート部材の外面と鉄筋間に電気的導通を付与する短絡埋設物が存在するか否かを容易に検出し、若し存在した場合には、この短絡埋設物を除去した後、コンクリート部材の外面に陽極を装着する技術を提供することを目的とするものである。   The present invention easily detects whether or not there is a short-circuit buried object that provides electrical continuity between the outer surface of the concrete member and the reinforcing bar in the concrete member to be subjected to the external power supply type electric protection. In such a case, the object is to provide a technique for mounting an anode on the outer surface of a concrete member after removing the short-circuit embedded object.

本発明は、上記問題点を解決するために開発されたもので、コンクリート中の鉄筋や鋼材を保護するために、外部電源方式の電気防食を施すに当り、可撓性を有する箒状の導電性部材をコンクリート部材の外面に接触させて移動させ、該導電性部材とコンクリート中の鉄筋との間の短絡の有無によりコンクリート表面にある露出金属を検知し、コンクリート表面に存在する短絡埋設物を除去した後、コンクリート部材の外面に陽極を装着することを特徴とする電気防食工の事前処理方法である。この方法によれば外部電源方式の電気防食において、短絡埋設物を簡単にかつ、正確に検知することが可能となりトラブルをなくすることができる。   The present invention has been developed to solve the above-mentioned problems. In order to protect the reinforcing bars and steel materials in the concrete, a flexible bowl-shaped conductive material is used in the case of applying an external power supply type anticorrosion. The contact member is moved in contact with the outer surface of the concrete member, the exposed metal on the concrete surface is detected by the presence or absence of a short circuit between the conductive member and the reinforcing bar in the concrete, and the short-circuit buried object existing on the concrete surface is detected. After the removal, an anticorrosion pretreatment method characterized by attaching an anode to the outer surface of the concrete member. According to this method, it is possible to easily and accurately detect the short-circuit buried object in the external power supply type electric corrosion protection, and trouble can be eliminated.

本発明によれば、外部電源方式の電気防食を施すべきコンクリート部材中にコンクリート部材の外面と鉄筋間に電気的導通を付与する短絡埋設物が存在するか否かを容易に検出することができ、若し短絡埋設物が存在するときには短絡埋設物を除去した後、コンクリート部材の外面に陽極を装着する。従って、短絡埋設物を容易に発見することができ、短絡によるトラブルをなくすることが可能となった。   According to the present invention, it is possible to easily detect whether or not there is a short-circuit embedded object that provides electrical continuity between the outer surface of the concrete member and the reinforcing bar in the concrete member that is to be subjected to external power supply type anticorrosion. When there is a short-circuit embedded object, the short-circuit embedded object is removed, and then an anode is attached to the outer surface of the concrete member. Therefore, it is possible to easily find the short-circuit buried object and eliminate the trouble due to the short-circuit.

本発明は外部電源方式の電気防食を行う場合に適用される短絡埋設物の検出、除去技術である。   The present invention is a technique for detecting and removing a short-circuit embedded object that is applied in the case of performing an external power-source type anti-corrosion.

以下、図面を参照して本発明を実施するための最良の形態を説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

図1に本発明方法を実施するシステムの構成図を示した。このシステムは箒状をなす導電性部材11を表示装置14、直流電圧計15を介して、導線13でコンクリート部材20中の鉄筋21に結線する。コンクリート部材20は、外部電源方式の電気防食を行うために、コンクリート部材20の外面14に溝23を設け、ここに陽極を装着する。   FIG. 1 shows a block diagram of a system for carrying out the method of the present invention. In this system, a conductive member 11 having a bowl shape is connected to a reinforcing bar 21 in a concrete member 20 through a display device 14 and a DC voltmeter 15 with a conductive wire 13. The concrete member 20 is provided with a groove 23 on the outer surface 14 of the concrete member 20 and is provided with an anode in order to perform an external power supply type electric corrosion protection.

陽極の装着に先立って、上記箒状の導電性部材11のホールダ12を持って、コンクリート部材20の外面24に導電性部材11を接触させながら移動し、導電性部材11とコンクリート部材20中の鉄筋21との間の短絡を検知し、コンクリート部材20中に存在する短絡埋設物22の存在を検知する。このときもし、コンクリート部材20の外面24又は溝23の内面と鉄筋21とを電気的に短絡させる短絡埋設物22が存在すると、表示装置14に表示される。   Prior to mounting the anode, the holder 12 of the bowl-shaped conductive member 11 is held and moved while the conductive member 11 is in contact with the outer surface 24 of the concrete member 20, so that the conductive member 11 and the concrete member 20 The short circuit between the reinforcing bars 21 is detected, and the presence of the short circuit embedded object 22 existing in the concrete member 20 is detected. At this time, if there is a short-circuit embedded object 22 that electrically short-circuits the outer surface 24 of the concrete member 20 or the inner surface of the groove 23 and the reinforcing bar 21, it is displayed on the display device 14.

表示装置14の表示手段としては直流電圧計等を用いればよいが、導通があったとき、作動するランプやブザー等による警報を用いてもよい。短絡埋設物22が検知されたらこれを除去した後、コンクリート部材20や外面24の溝23内などに電気防食装置の陽極を装着する。   A DC voltmeter or the like may be used as the display means of the display device 14, but an alarm by a lamp, a buzzer or the like that operates when there is continuity may be used. When the short-circuit embedded object 22 is detected, it is removed, and then the anode of the anticorrosion device is mounted in the concrete member 20 or the groove 23 of the outer surface 24.

可撓性を有する箒状の導電性部材11は市販のワイヤーブラシや箒状の簡易な導電性材料からなる部材を用いるとよい。例えば、コンクリート部材20中の鉄筋21を市販の導通テスター等と接続し、上記の導電性部材11をコンクリート部材20の外面24に沿って移動させることにより、短絡埋設物22が存在した場合にはテスターが反応し、発見することが可能となる。   The flexible bowl-shaped conductive member 11 may be a commercially available wire brush or a bowl-shaped member made of a simple conductive material. For example, when the rebar 21 in the concrete member 20 is connected to a commercially available continuity tester or the like, and the conductive member 11 is moved along the outer surface 24 of the concrete member 20, the short-circuit buried object 22 exists. Testers can react and be discovered.

このような手法を用いることにより、専門の技術を有する技術者でなくとも、簡単に、かつ、確実に短絡埋設物22を発見することが可能となり、これを除去することが容易にできるので確実な電気防食を施工することが可能となる。   By using such a method, even a non-technical engineer can easily and reliably find the short-circuit embedded object 22 and can easily remove it, so that it can be reliably removed. It becomes possible to construct a safe cathodic protection.

本発明方法を実施するシステムの構成図である。It is a block diagram of the system which implements the method of this invention.

符号の説明Explanation of symbols

11 導電性部材
12 ホールダ
13 導線
14 表示装置
15 直流電圧計
20 コンクリート部材
21 鉄筋
22 短絡埋設物
23 溝
24 外面
DESCRIPTION OF SYMBOLS 11 Conductive member 12 Holder 13 Conductor 14 Display apparatus 15 DC voltmeter 20 Concrete member 21 Reinforcement 22 Short-circuit buried object 23 Groove 24 Outer surface

Claims (1)

外部電源方式の電気防食を施すに当り、可撓性を有する箒状の導電性部材をコンクリート部材の外面に接触させて移動させ、該導電性部材とコンクリート中の鉄筋との間の短絡の有無によりコンクリート表面にある露出金属を検知し、コンクリート表面に存在する短絡埋設物を除去した後、コンクリート部材の外面に陽極を装着することを特徴とする電気防食工の事前処理方法。   In applying external power source type anti-corrosion, the flexible bowl-shaped conductive member is moved in contact with the outer surface of the concrete member, and there is a short circuit between the conductive member and the reinforcing bar in the concrete. A pretreatment method for an anticorrosion worker, wherein the exposed metal on the surface of the concrete is detected by removing the short-circuit buried object existing on the surface of the concrete and then an anode is attached to the outer surface of the concrete member.
JP2004079019A 2004-03-18 2004-03-18 Pretreatment method of cathodic protection Expired - Fee Related JP4008891B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012193425A (en) * 2011-03-17 2012-10-11 Sumitomo Osaka Cement Co Ltd Detection method of short-circuited foreign matter and detection device of short-circuited foreign matter
JP2012214823A (en) * 2011-03-31 2012-11-08 Sumitomo Osaka Cement Co Ltd Method for preventing short circuit in electric corrosion protection method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012193425A (en) * 2011-03-17 2012-10-11 Sumitomo Osaka Cement Co Ltd Detection method of short-circuited foreign matter and detection device of short-circuited foreign matter
JP2012214823A (en) * 2011-03-31 2012-11-08 Sumitomo Osaka Cement Co Ltd Method for preventing short circuit in electric corrosion protection method

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