JPH09256649A - Disassembling method for reinforcing concrete structure - Google Patents

Disassembling method for reinforcing concrete structure

Info

Publication number
JPH09256649A
JPH09256649A JP6135696A JP6135696A JPH09256649A JP H09256649 A JPH09256649 A JP H09256649A JP 6135696 A JP6135696 A JP 6135696A JP 6135696 A JP6135696 A JP 6135696A JP H09256649 A JPH09256649 A JP H09256649A
Authority
JP
Japan
Prior art keywords
cathode
concrete
concrete structure
reinforced concrete
putty
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.)
Granted
Application number
JP6135696A
Other languages
Japanese (ja)
Other versions
JP3195228B2 (en
Inventor
Hiroshi Ito
洋 伊藤
Katsuhiko Sakaguchi
雄彦 坂口
Yukinori Kiuchi
幸則 木内
Tatsuya Ishii
辰弥 石井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NAKABOOTEC KK
Kumagai Gumi Co Ltd
Original Assignee
NAKABOOTEC KK
Kumagai Gumi Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NAKABOOTEC KK, Kumagai Gumi Co Ltd filed Critical NAKABOOTEC KK
Priority to JP06135696A priority Critical patent/JP3195228B2/en
Publication of JPH09256649A publication Critical patent/JPH09256649A/en
Application granted granted Critical
Publication of JP3195228B2 publication Critical patent/JP3195228B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide an efficient disassembling method, proper to partial disassembly, for a reinforcing concrete structure by carrying a weak DC current therein. SOLUTION: Several points on the surface of a concrete 1 in a reinforcing concrete structure are chipped, reinforcing bars 2 are exposed to the outside and the anode terminal 5 of a DC power supply 4 is connected to the exposed portions 2a. In an partial area R on the reinforcing concrete structure to be disassembled, a cathode plate 6 is set up on the surface of the concrete 1. The cathode plate 6 is formed by applying conductive putty 8 to a wire gauze 7. The conductive putty 8 is formed by mixing and kneading bentonite and magnesium chloride at a weight ratio of 1:1 with 30-40% water into putty. The cathode terminal 9 of the DC power supply 4 is connected to the gauze 7 to carry a DC current of few Wh/m<2> - few tens Wh/m<2> for few hours-one day.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】この発明は、鉄筋コンクリー
ト構造物を解体する方法に関するものであり、特に、鉄
筋とコンクリート間に微弱電流を通電して鉄筋を酸化し
た後、構造物の全体又は一部を解体する方法に関するも
のである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dismantling a reinforced concrete structure, and in particular, after a weak current is passed between the rebar and concrete to oxidize the rebar, the whole or part of the structure is It is about the method of dismantling.

【0002】[0002]

【従来の技術】従来の此種鉄筋コンクリート構造物の解
体方法として、予め塩化ナトリウム水溶液又は塩化カル
シウム水溶液を鉄筋コンクリートに含浸した上で、鉄筋
に陽極を接続し、更に、コンクリート表面に層状金属を
設置して之に陰極を接続し、両電極間に数mA/cm2 程度
の微弱電流を通電した後、解体する方法が知られている
(特開昭52−101834)。
2. Description of the Related Art As a conventional method for dismantling a reinforced concrete structure of this kind, reinforced concrete is impregnated with an aqueous sodium chloride solution or an aqueous calcium chloride solution in advance, an anode is connected to the reinforcing bar, and a layered metal is further installed on the concrete surface. There is known a method in which a cathode is connected, a weak current of about several mA / cm 2 is passed between both electrodes, and then disassembled (Japanese Patent Laid-Open No. 52-101834).

【0003】この方法によれば、鉄筋が電流により酸化
して膨張し、該鉄筋とコンクリートとが剥離するととも
に、コンクリート内部に亀裂が生じるため、コンクリー
トを粉砕し易くなる。また、予め塩化ナトリウム水溶液
又は塩化カルシウム水溶液を鉄筋コンクリートに含浸し
て置くのは、鉄筋の酸化を促進するためである。
According to this method, the reinforcing bars oxidize and expand due to the electric current, the reinforcing bars separate from the concrete, and cracks are generated inside the concrete, so that the concrete is easily ground. Further, the reason why the reinforced concrete is impregnated with the sodium chloride aqueous solution or the calcium chloride aqueous solution in advance is to accelerate the oxidation of the reinforcing bar.

【0004】[0004]

【発明が解決しようとする課題】塩化ナトリウム水溶液
又は塩化カルシウム水溶液を予め鉄筋コンクリートに含
浸する手段として、前掲の公知の文献によれば、これら
水溶液を含浸した布、綿等をコンクリート表面に7日程
度添付しておく方法、又はコンクリートに棒状の孔をあ
け、この孔に前記布、綿を挿入し若しくは水溶液を注入
しておく方法が提案されている。
As a means for preliminarily impregnating reinforced concrete with an aqueous solution of sodium chloride or an aqueous solution of calcium chloride, according to the above-mentioned known literature, cloth, cotton, etc. impregnated with these aqueous solutions are applied to the concrete surface for about 7 days. There is proposed a method of attaching it, or a method of making a rod-shaped hole in concrete and inserting the cloth or cotton into the hole or injecting an aqueous solution.

【0005】しかし、このような作業は煩雑で日数もか
かる。また、構造物の全体ではなく一部分のみを解体す
る場合に、解体しない部分まで劣化してしまうおそれが
ある。更に、酸化促進剤としてより効果的な材料が存在
することも考えられる。
However, such a work is complicated and takes many days. Further, when disassembling only a part of the structure instead of the whole, there is a possibility that the part that is not disassembled may deteriorate. Furthermore, it is conceivable that there are materials that are more effective as oxidation promoters.

【0006】そこで、より効率的に鉄筋コンクリート構
造物を解体するために解決すべき技術的課題が生じてく
るのであり、本発明は該課題を解決することを目的とす
る。
Therefore, there arises a technical problem to be solved in order to more efficiently dismantle a reinforced concrete structure, and an object of the present invention is to solve the problem.

【0007】[0007]

【課題を解決するための手段】本発明は上記課題を解決
するために提案されたものであり、鉄筋に陽極を接続
し、コンクリート表面に陰極を接続して直流電流を通電
した後、鉄筋コンクリート構造物を解体する方法に於
て、酸化促進剤を混入した特に高吸水性の陰極平板をコ
ンクリート表面の解体する領域に被蔽することにより、
前記陰極を構成した鉄筋コンクリート構造物の解体方
法、及びベントナイトと、前記酸化促進剤として塩化マ
グネシウムとを、水にて練り混ぜた導電性パテ状物を金
網に塗布することにより、前記陰極平板を構成した鉄筋
コンクリート構造物の解体方法を提供するものである。
SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems, in which an anode is connected to a reinforcing bar and a cathode is connected to a concrete surface to apply a direct current, and then a reinforced concrete structure is used. In the method of disassembling an object, by covering a particularly highly water-absorbing cathode plate mixed with an oxidation promoter in the area of the concrete surface to be disassembled,
A method for disassembling a reinforced concrete structure that constitutes the cathode, and bentonite, and magnesium chloride as the oxidation accelerator, by applying a conductive putty-like material kneaded with water to a wire net, the cathode flat plate is configured. The present invention provides a method for disassembling a reinforced concrete structure.

【0008】ここで、前記陰極平板について、特に高吸
水性のものを可とする理由は、高吸水性である程、酸化
促進剤が電解し易く、該陰極平板とコンクリート間の界
面抵抗が小さくなって、導電性を高めることができるか
らである。従って、高吸水性の下限は、混入する酸化促
進剤を充分に電解することができる程度ということがで
きる。
Here, the reason why the cathode plate is made to have a particularly high water absorption is that the higher the water absorption is, the more easily the oxidation accelerator is electrolyzed and the interface resistance between the cathode plate and the concrete is small. This is because the conductivity can be increased. Therefore, it can be said that the lower limit of the high water absorption is such a degree that the mixed oxidation accelerator can be sufficiently electrolyzed.

【0009】また、ベンナイトは保水性に富み、高吸水
性の条件を充分に満たしている。
Bentonite is rich in water retention and sufficiently satisfies the condition of high water absorption.

【0010】[0010]

【発明の実施の形態】以下、本発明の実施の形態を図1
及び図2に従って詳述する。図に於いて1は鉄筋コンク
リート構造物のコンクリートであり、該コンクリート1
内には補強筋として鉄筋2が縦横に埋設されている。こ
の鉄筋コンクリート構造物の一部領域Rを解体する際
は、先ず該一部領域R周辺数箇所をハンドブレーカ等に
てはつりし(はつり部3,3…)、このはつり部3,3
…から露出した鉄筋2a,2a…に直流電源装置4の陽
極端子5を接続する。ここで、該陽極端子5の先端はマ
グネットになっているため、容易に接続することができ
る。
FIG. 1 is a block diagram showing an embodiment of the present invention.
And FIG. In the figure, 1 is concrete of a reinforced concrete structure.
Reinforcing bars 2 are vertically and horizontally embedded as reinforcing bars inside. When disassembling a partial region R of this reinforced concrete structure, first, several places around the partial region R are suspended with a hand breaker or the like (slipping parts 3, 3 ...)
The anode terminal 5 of the DC power supply device 4 is connected to the reinforcing bars 2a, 2a exposed from. Here, since the tip of the anode terminal 5 is a magnet, it can be easily connected.

【0011】そして、該一部領域R表面に陰極平板6を
設置して、該一部領域Rを被蔽する。この陰極平板6は
金網7に導電性パテ状物8を塗布したものであり、その
設置方法は前記一部領域R表面に金網7を張り付け、そ
の上から導電性パテ状物8を塗布しても良く、或いは予
め金網7に導電性パテ状物8を塗布しておき、それを前
記一部領域R表面に張り付けても良い。
Then, the cathode flat plate 6 is placed on the surface of the partial region R to cover the partial region R. This cathode flat plate 6 is a wire net 7 coated with a conductive putty-like material 8. The installation method is such that the wire netting 7 is attached to the surface of the partial region R, and the conductive putty-like material 8 is applied thereon. Alternatively, the metal mesh 7 may be coated with the conductive putty-like material 8 in advance, and the metal putty 7 may be attached to the surface of the partial region R.

【0012】また、前記導電性パテ状物8は、重量比が
1対1のベントナイトと塩化マグネシウムとを水比30
〜40%で練り混ぜ、パテ状に形成したものである。
尚、前記陰極平板として、高吸水性不織布に塩化マグネ
シウム等の酸化促進剤を含浸したもの等を用いても良
い。
The conductive putty material 8 comprises bentonite and magnesium chloride in a weight ratio of 1: 1 in a water ratio of 30.
It is kneaded at 40% to form a putty.
In addition, as the cathode plate, a highly water-absorbent non-woven fabric impregnated with an oxidation promoter such as magnesium chloride may be used.

【0013】而して、前記陰極平板6の金網7の一端に
前記直流電源装置4の陰極端子9を接続し、前記鉄筋2
とコンクリート1表面との間に低電圧・低電流の直流電
気を流す。この通電時間は数時間から1日程度、通電量
は数Wh/m2から数十Wh/m2程度で十分である。そして、
この通電により前記一部領域Rについて以下のような現
象が表われる。
Then, the cathode terminal 9 of the DC power supply device 4 is connected to one end of the wire net 7 of the cathode flat plate 6, and the rebar 2 is connected.
Low-voltage, low-current DC electricity is passed between the concrete and the surface of the concrete 1. It is sufficient that the energizing time is several hours to one day and the energizing amount is several Wh / m 2 to several tens Wh / m 2 . And
This energization causes the following phenomenon in the partial region R.

【0014】 陰極平板6の導電性パテ状物8中の塩
化マグネシウムが電解して、塩素イオンとマグネシウム
イオンとになる。この時、前記導電性パテ状物8中のベ
ントナイトは保水性に優れているので、これにより陰極
平板6とコンクリート1との間の界面抵抗が小さくなっ
て導電性が高まる。
Magnesium chloride in the conductive putty material 8 of the cathode plate 6 is electrolyzed into chlorine ions and magnesium ions. At this time, the bentonite in the conductive putty material 8 is excellent in water retention, so that the interface resistance between the cathode flat plate 6 and the concrete 1 is reduced, and the conductivity is increased.

【0015】 コンクリート1中のカルシウムイオン
が溶出して、陰極平板6方向へ移動し、コンクリート1
の強度が低下する。 鉄筋2中の鉄が電解して溶出し、これにより鉄筋断
面積が減少してコンクリート1との付着強度が低下す
る。
Calcium ions in the concrete 1 elute and move toward the cathode plate 6 to
Strength decreases. The iron in the reinforcing bar 2 is electrolyzed and eluted, which reduces the sectional area of the reinforcing bar and reduces the adhesion strength with the concrete 1.

【0016】 により溶出した鉄イオンとコンクリ
ート1中の水が反応して、鉄筋2とコンクリート1との
境界面に腐食生成物が発生し、且つ、膨張する。 により生成した塩素イオンはコンクリート1中に
拡散しながら、該コンクリート1中の水酸化ナトリウム
と反応して、該コンクリート1の硬化体を多孔化させ
る。
The iron ions eluted by and the water in the concrete 1 react to generate a corrosion product at the interface between the reinforcing bar 2 and the concrete 1, and the corrosion product expands. The chlorine ions generated by the above process diffuse into the concrete 1 and react with sodium hydroxide in the concrete 1 to make the hardened body of the concrete 1 porous.

【0017】 また、塩素イオンは硫酸イオン等と比
べるとコンクリート1中を拡散し易く、より深く侵入し
ていく。そして、鉄筋2へ到達すると該鉄筋2表面の不
導体被膜を破壊する。これにより、の腐食が促進され
て、コンクリート1にひび割れが発生する。
In addition, chlorine ions are more likely to diffuse in the concrete 1 and penetrate deeper than the sulfate ions and the like. When it reaches the reinforcing bar 2, the non-conductive coating on the surface of the reinforcing bar 2 is destroyed. As a result, the corrosion of the concrete 1 is promoted and the concrete 1 is cracked.

【0018】 により多孔化したコンクリート1の
硬化体に、により生成したマグネシウムイオンが侵入
してコンクリート1を水溶性にする。即ち、侵入したマ
グネシウムイオンはカルシウムシリケートハイドレート
と反応して、結合力のないマグネシウムシリケートハイ
ドレートを生成する。これにより、コンクリート1の圧
縮強度が低下する。(実験によれば、初期強度の50〜
60%にまで低下した。) 斯くして、陰極平板6を剥離すれば、鉄筋コンクリート
構造物の一部領域Rを極めて容易に解体することができ
る。
Magnesium ions generated by the method penetrate into the hardened body of the concrete 1 that has been made porous by making the concrete 1 water-soluble. That is, the invading magnesium ions react with calcium silicate hydrate to produce magnesium silicate hydrate having no binding force. This reduces the compressive strength of the concrete 1. (According to the experiment, the initial strength of 50 ~
It fell to 60%. ) Thus, if the cathode plate 6 is peeled off, the partial region R of the reinforced concrete structure can be disassembled extremely easily.

【0019】尚、本発明は、本発明の精神を逸脱しない
限り種々の改変を為すことができ、そして、本発明が該
改変されたものに及ぶことは当然である。
The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

【0020】[0020]

【発明の効果】以上説明したように、本発明は陰極平板
に酸化促進剤が混入されているので、作業が簡素化され
るだけでなく、陰極平板を設置した部分のみを劣化させ
ることができ、解体しない部分まで劣化させるおそれが
ない。従って、鉄筋コンクリート構造物の部分解体に適
しており、例えば、ビルの屋根スラブや側壁等の補修・
改築、或いは地中連続壁立坑のシールド機発進又は到達
孔の解体等に適用すれば、作業効率が大幅に向上する。
As described above, according to the present invention, since the cathode plate is mixed with the oxidation accelerator, not only the work is simplified but also only the portion where the cathode plate is installed can be deteriorated. , There is no danger of degrading parts that are not disassembled. Therefore, it is suitable for partial disassembly of reinforced concrete structures, such as repairing roof slabs and side walls of buildings.
If it is applied to remodeling, starting a shield machine for underground shafts, or dismantling reaching holes, work efficiency will be greatly improved.

【0021】また、保水性に優れたベントナイトと、電
解質となる塩化マグネシウムとを水にて練り混ぜる等し
て、陰極平板を高吸水性にすれば、陰極平板とコンクリ
ート間の界面抵抗が小さくなり、導電性を高めることが
できる。
Further, if the cathode plate is made to have a high water absorption property by mixing, for example, bentonite excellent in water retention and magnesium chloride as an electrolyte with water, the interfacial resistance between the cathode plate and concrete becomes small. The conductivity can be increased.

【0022】更に、酸化促進剤として塩化マグネシウム
を用いれば、拡散性に富む塩素イオンのコンクリート硬
化体多孔化作用及び鉄筋表面の不導体被膜破壊作用に併
せて、マグネシウムイオンが多孔化したコンクリート硬
化体に侵入して、コンクリートを水溶性化するので、塩
化ナトリウムや塩化カルシウムを用いた場合よりも、コ
ンクリート圧縮強度を可及的に低下させることができ
る。
Further, when magnesium chloride is used as the oxidation accelerator, the concrete hardening body in which the magnesium ions are made porous in addition to the porosifying effect of chlorine ions, which is rich in diffusivity, on the concrete hardening body and the nonconductive film destruction effect on the surface of the reinforcing bar The concrete compressive strength can be reduced as much as possible, as compared with the case of using sodium chloride or calcium chloride.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施の形態を示す平面図。FIG. 1 is a plan view showing an embodiment of the present invention.

【図2】本発明の実施の形態を示す側面断面図。FIG. 2 is a side sectional view showing the embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 コンクリート 2 鉄筋 4 直流電源装置 5 陽極端子 6 陰極平板 7 金網 8 導電性パテ状物 9 陰極端子 1 Concrete 2 Reinforcing bar 4 DC power supply device 5 Anode terminal 6 Cathode plate 7 Wire mesh 8 Conductive putty 9 Cathode terminal

───────────────────────────────────────────────────── フロントページの続き (72)発明者 木内 幸則 埼玉県上尾市中新井417−16 株式会社ナ カボーテック技術開発研究所内 (72)発明者 石井 辰弥 埼玉県上尾市中新井417−16 株式会社ナ カボーテック技術開発研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukinori Kiuchi 417-16 Nakaarai, Ageo-shi, Saitama Nakavotech Institute of Technology Development (72) Inventor Tatsuya Ishii 417-16 Nakaarai, Ageo-shi, Saitama Na Corporation Cabotech Technology Development Laboratory

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 鉄筋に陽極を接続し、コンクリート表面
に陰極を接続して直流電流を通電した後、鉄筋コンクリ
ート構造物を解体する方法に於て、酸化促進剤を混入し
た陰極平板をコンクリート表面の解体する領域に被蔽す
ることにより、前記陰極を構成したことを特徴とする鉄
筋コンクリート構造物の解体方法。
1. A method of dismantling a reinforced concrete structure after connecting an anode to a reinforcing bar, connecting a cathode to a concrete surface and applying a direct current, and then disassembling a cathode plate containing an oxidation accelerator onto the concrete surface. A method for disassembling a reinforced concrete structure, characterized in that the cathode is constituted by covering an area to be disassembled.
【請求項2】 鉄筋に陽極を接続し、コンクリート表面
に陰極を接続して直流電流を通電した後、鉄筋コンクリ
ート構造物を解体する方法に於て、酸化促進剤を混入し
た高吸水性の陰極平板をコンクリート表面の解体する領
域に被蔽することにより、前記陰極を構成したことを特
徴とする鉄筋コンクリート構造物の解体方法。
2. A method of dismantling a reinforced concrete structure after connecting an anode to a reinforcing bar, connecting a cathode to a concrete surface and passing a direct current, and then dismantling a reinforced concrete structure. A method for disassembling a reinforced concrete structure, characterized in that the cathode is constituted by covering the area of the concrete surface to be disassembled.
【請求項3】 ベントナイトと、前記酸化促進剤として
塩化マグネシウムとを、水にて練り混ぜた導電性パテ状
物を金網に塗布することにより、前記陰極平板を構成し
た請求項1又は2記載の鉄筋コンクリート構造物の解体
方法。
3. The cathode flat plate according to claim 1, wherein bentonite and magnesium chloride as the oxidation accelerator are kneaded in water and a conductive putty-like material is applied to the wire net to form the cathode flat plate. Method of dismantling reinforced concrete structures.
JP06135696A 1996-03-18 1996-03-18 Demolition method for reinforced concrete structures Expired - Fee Related JP3195228B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP06135696A JP3195228B2 (en) 1996-03-18 1996-03-18 Demolition method for reinforced concrete structures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP06135696A JP3195228B2 (en) 1996-03-18 1996-03-18 Demolition method for reinforced concrete structures

Publications (2)

Publication Number Publication Date
JPH09256649A true JPH09256649A (en) 1997-09-30
JP3195228B2 JP3195228B2 (en) 2001-08-06

Family

ID=13168803

Family Applications (1)

Application Number Title Priority Date Filing Date
JP06135696A Expired - Fee Related JP3195228B2 (en) 1996-03-18 1996-03-18 Demolition method for reinforced concrete structures

Country Status (1)

Country Link
JP (1) JP3195228B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11107673A (en) * 1997-09-30 1999-04-20 Kumagai Gumi Co Ltd Face cutting method for start and arrival portion in vertical shaft shield
JPH11200642A (en) * 1998-01-07 1999-07-27 Kumagai Gumi Co Ltd Demolishing method for reinforced concrete structure
CN100370107C (en) * 2006-10-19 2008-02-20 上海交通大学 Electrifying dismounting method for steel reinforced concrete structure building
WO2024014004A1 (en) * 2022-07-15 2024-01-18 日本電信電話株式会社 Peeling device, peeling method, and program

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11107673A (en) * 1997-09-30 1999-04-20 Kumagai Gumi Co Ltd Face cutting method for start and arrival portion in vertical shaft shield
JPH11200642A (en) * 1998-01-07 1999-07-27 Kumagai Gumi Co Ltd Demolishing method for reinforced concrete structure
CN100370107C (en) * 2006-10-19 2008-02-20 上海交通大学 Electrifying dismounting method for steel reinforced concrete structure building
WO2024014004A1 (en) * 2022-07-15 2024-01-18 日本電信電話株式会社 Peeling device, peeling method, and program

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