JPH0352321Y2 - - Google Patents
Info
- Publication number
- JPH0352321Y2 JPH0352321Y2 JP12764585U JP12764585U JPH0352321Y2 JP H0352321 Y2 JPH0352321 Y2 JP H0352321Y2 JP 12764585 U JP12764585 U JP 12764585U JP 12764585 U JP12764585 U JP 12764585U JP H0352321 Y2 JPH0352321 Y2 JP H0352321Y2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- reinforcing bars
- conductive
- electrode
- reinforced concrete
- 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.)
- Expired
Links
- 239000004567 concrete Substances 0.000 claims description 30
- 230000003014 reinforcing effect Effects 0.000 claims description 28
- 239000011150 reinforced concrete Substances 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000004210 cathodic protection Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- 229920001940 conductive polymer Polymers 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 239000011371 regular concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Landscapes
- Prevention Of Electric Corrosion (AREA)
- Building Environments (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、鉄筋コンクリート構造物に関し、特
に、内部の鉄筋の腐食を防止し得て、亀裂等の発
生を防止した鉄筋コンクリート構造物に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a reinforced concrete structure, and in particular, to a reinforced concrete structure that can prevent corrosion of internal reinforcing bars and prevent the occurrence of cracks and the like.
（従来の技術）
鉄筋コンクリートは、高強度を有し、耐久性に
も優れているため、高層ビル・橋脚等に広く使用
されている。近年、このような鉄筋コンクリート
構造物に亀裂が発生し、耐久性を損なうおそれが
あることがしばしば報告されている。この亀裂
は、コンクリート内へ海水、融雪剤等が浸透する
場合、コンクリートの骨材として、海砂を用いて
いる場合等によく見られ、コンクリート内の鉄筋
が海水・融雪剤・海砂に含まれる塩分により腐食
し、鉄筋が膨張することに起因していると考えら
れる。(Prior Art) Reinforced concrete has high strength and excellent durability, so it is widely used for high-rise buildings, bridge piers, etc. In recent years, it has been frequently reported that cracks occur in such reinforced concrete structures, which may impair their durability. These cracks are often seen when seawater, snow melting agents, etc. penetrate into the concrete, or when sea sand is used as aggregate for concrete. This is thought to be caused by the reinforcement corroding and expanding due to the salt content.
このため、鉄筋の腐食を防止することが、鉄筋
コンクリートの亀裂の発生を防止し得て、耐久性
を向上させ得る。コンクリート内の鉄筋の腐食を
防止するために、鉄筋に防腐剤等を塗布して塗膜
を形成し、あるいは、鉄筋にテープを巻きつける
等して、鉄筋が直接コンクリート等に接触しない
ようにすることが考えられるが、コンクリートと
の付着が良好である鉄筋の特性が発揮されず、鉄
筋コンクリートの強度の低下をきたす。 Therefore, preventing corrosion of reinforcing bars can prevent cracks from occurring in reinforced concrete and can improve durability. To prevent corrosion of reinforcing bars in concrete, apply preservatives to the reinforcing bars to form a film, or wrap tape around the reinforcing bars to prevent them from coming into direct contact with concrete, etc. However, the characteristics of the reinforcing bars, which have good adhesion to the concrete, are not exhibited, resulting in a decrease in the strength of the reinforced concrete.
また、土中・水中等の鉄鋼構造物の防食方法と
して電気防食法が知られている。電気防食方法
は、腐食の原因である金属表面に生じる局部的な
電位差を解消させるべく鉄鋼構造物に電流を流す
ものである。しかし、鉄筋コンクリート内におけ
る鉄筋の防食には、通常のコンクリートが導電性
でないために、外部から電圧を印加して鉄筋に電
流を通流させることができず、従つて鉄筋コンク
リートにおける鉄筋の防食には、電気防食法は適
用できなかつた。近年、網目状に形成された金属
の周囲を導電性のポリマーで覆つたテープを、被
防食体であるスチールパイプ・鋼材等の鋼構造物
に巻きつけ、テープの網目状の金属と鋼構造物と
の間に直流電圧を印加する方法が開発されてい
る。この方法では消費電力が路上照明程度の数ワ
ツト／m2ですむ。しかし、鉄筋コンクリートにお
ける鉄筋の防食にこの方法を用いることは、前述
のように、鉄筋とコンクリートの付着力を弱め、
鉄筋コンクリート自体の強度の低下につながる。 In addition, cathodic protection is known as a corrosion protection method for steel structures underground, underwater, etc. Cathodic protection methods involve passing an electric current through a steel structure in order to eliminate local potential differences that occur on metal surfaces, which are the cause of corrosion. However, in order to prevent corrosion of reinforcing bars in reinforced concrete, since ordinary concrete is not conductive, it is not possible to apply an external voltage to cause current to flow through reinforcing bars. Cathodic protection methods could not be applied. In recent years, a tape in which the mesh-shaped metal is covered with a conductive polymer is wrapped around a steel structure such as a steel pipe or steel material to be protected from corrosion. A method has been developed in which a DC voltage is applied between the This method requires only a few watts/m 2 of electricity, which is equivalent to street lighting. However, as mentioned above, using this method to prevent corrosion of reinforcing bars in reinforced concrete weakens the adhesion between reinforcing bars and concrete.
This leads to a decrease in the strength of the reinforced concrete itself.
（考案が解決しようとする問題点）
本考案は、上記従来の技術の問題点を解決する
ためのものであり、その目的は、コンクリート内
の鉄筋の腐食を、鉄筋自体の形状や表面状態等に
影響されることなく防止し得る鉄筋コンクリート
構造物を提供することにある。本考案の他の目的
は、海水・融雪剤が浸透する場合あるいはコンク
リートの骨材として海砂を用いた場合にも亀裂の
発生するおそれがなく、高強度を維持し得、かつ
耐久性の向上を図つた鉄筋コンクリート構造物を
提供することにある。(Problems to be solved by the invention) The present invention is intended to solve the problems of the conventional technology described above, and its purpose is to prevent corrosion of reinforcing bars in concrete by controlling the shape and surface condition of the reinforcing bars themselves. The object of the present invention is to provide a reinforced concrete structure that can prevent the above-mentioned problems without being affected by it. Another purpose of this invention is to maintain high strength and improve durability without the risk of cracking even when seawater or snow melting agent penetrates or when sea sand is used as aggregate for concrete. The purpose of this invention is to provide a reinforced concrete structure that achieves the following.
（問題点を解決するための手段）
本考案は中心に配設される鉄筋と、該鉄筋を囲
繞する導電性コンクリートと、該導電性コンクリ
ートに接続される電極と、該導電性コンクリート
を囲繞する通常のコンクリートと、前記電極と鉄
筋との間に電流を通流する手段とを具備してな
り、そのことにより上記目的が達成される。(Means for solving the problem) The present invention includes a reinforcing bar placed at the center, a conductive concrete surrounding the reinforcing bar, an electrode connected to the conductive concrete, and an electrode surrounding the conductive concrete. The above object is achieved by comprising ordinary concrete and means for passing an electric current between the electrode and the reinforcing steel.
（実施例） 以下に本考案の実施例について説明する。(Example) Examples of the present invention will be described below.
本考案の鉄筋コンクリート構造物は、第１図お
よび第２図に示すように、中心に配される、例え
ばＨ型鋼を用いた鉄筋１１と、該鉄筋を囲繞すべ
く配された導電性コンクリート１２と、該導電性
コンクリート１２と電気的に接触するように、例
えば導電性コンクリート１２を囲繞すべく配され
た網状の金属等の電極１３と、該電極１３の周囲
に配された通常のコンクリート１４とを有する。
そして、鉄筋１１は電源１５の陰極に接続され、
電極１３は電源１５の正極に接続されており、電
極１３と鉄筋１１との間に電圧が印加され、導電
性コンクリート１２内を電流が通流する。 As shown in FIGS. 1 and 2, the reinforced concrete structure of the present invention includes a reinforcing bar 11 made of, for example, H-shaped steel placed at the center, and conductive concrete 12 arranged to surround the reinforcing bar. , an electrode 13 made of, for example, a net-shaped metal arranged to surround the conductive concrete 12 so as to be in electrical contact with the conductive concrete 12, and a regular concrete 14 arranged around the electrode 13. has.
Then, the reinforcing bar 11 is connected to the cathode of the power source 15,
The electrode 13 is connected to the positive electrode of a power source 15, a voltage is applied between the electrode 13 and the reinforcing bar 11, and a current flows through the conductive concrete 12.
導電性コンクリート１２は、例えば、セメン
ト・硅砂・炭素繊維・水を、それぞれの重量比
が、１：１〜３：0.004〜0.015：0.3〜0.8となる
ように混合させて得られる。この場合の導電性コ
ンクリート１２の体積固有抵抗は、１〜30Ω・cm
である。電極１３としては、網状金属物に限らず
例えば、金属線、金属棒、金属板等を導電性コン
クリート１２に少なくとも部分的に接続する構成
としてもよい。 The conductive concrete 12 is obtained, for example, by mixing cement, silica sand, carbon fiber, and water in a weight ratio of 1:1 to 3:0.004 to 0.015:0.3 to 0.8. In this case, the volume resistivity of the conductive concrete 12 is 1 to 30Ω・cm
It is. The electrode 13 is not limited to a net-like metal object, but may be a metal wire, a metal rod, a metal plate, etc., which are at least partially connected to the conductive concrete 12.
（作用）
このような構成の、本考案の鉄筋コンクリート
構造物は、電源１５により電極１３から、電流が
導電性コンクリート１２を通して鉄筋１１に通流
する。これにより鉄筋１１内には電流が通流し、
鉄筋１１の表面には、電位差が生じず、従つて、
金属の溶解反応が起こらず、鉄筋１１の腐食は完
全に防止される。(Function) In the reinforced concrete structure of the present invention having such a configuration, current flows from the electrode 13 through the conductive concrete 12 to the reinforcing bars 11 by the power source 15. As a result, current flows through the reinforcing bar 11,
No potential difference occurs on the surface of the reinforcing bar 11, therefore,
No metal dissolution reaction occurs, and corrosion of the reinforcing bars 11 is completely prevented.
（効果）
本考案の鉄筋コンクリート構造物は、このよう
に、内部の鉄筋自体の形状・表面状態に影響され
ることなく鉄筋は防食され、鉄筋コンクリート表
面に亀裂が発生するおそれがない。特に、海水、
融雪剤等が浸透する場合にも、鉄筋は腐食せず、
耐久性は著しく向上する。鉄筋は導電性のコンク
リートにて囲繞されているため、両者は確実に付
着し、強度の低下を招来するおそれがない。(Effects) In this way, in the reinforced concrete structure of the present invention, the reinforcing bars are protected from corrosion without being affected by the shape and surface condition of the internal reinforcing bars themselves, and there is no risk of cracks occurring on the reinforced concrete surface. In particular, seawater
Even when snow melting agents penetrate, the reinforcing bars do not corrode.
Durability is significantly improved. Since the reinforcing bars are surrounded by conductive concrete, the two are securely attached and there is no risk of a decrease in strength.
第１図は本考案の鉄筋コンクリート構造物の一
例を示す断面図、第２図は第１図の−線にお
ける断面図である。
１１……鉄筋、１２……導電性コンクリート、
１３……電極、１４……コンクリート、１５……
電源。
FIG. 1 is a sectional view showing an example of the reinforced concrete structure of the present invention, and FIG. 2 is a sectional view taken along the line - in FIG. 11... Reinforced steel, 12... Conductive concrete,
13...electrode, 14...concrete, 15...
power supply.
Claims (1)
導電性コンクリートと、該導電性コンクリート
に接続される電極と、該導電性コンクリートを
囲繞する通常のコンクリートと、前記電極と鉄
筋との間に電流を通流する手段とを具備する鉄
筋コンクリート構造物。 ２ 前記導電性コンクリートは、セメント・硅
砂・炭素繊維および水を混合してなる実用新案
登録請求の範囲第１項に記載の鉄筋コンクリー
ト構造物。 ３ 前記電極は、導電性コンクリートを囲繞する
網状の金属である実用新案登録請求の範囲第１
項に記載の鉄筋コンクリート構造物。[Scope of Claim for Utility Model Registration] 1. Reinforcing bars arranged at the center, conductive concrete surrounding the reinforcing bars, electrodes connected to the conductive concrete, and ordinary concrete surrounding the conductive concrete. and means for passing an electric current between the electrode and the reinforcing steel. 2. The reinforced concrete structure according to claim 1, wherein the conductive concrete is a mixture of cement, silica sand, carbon fiber, and water. 3. The electrode is a net-like metal that surrounds conductive concrete.Claim 1 of Utility Model Registration
Reinforced concrete structures as described in Section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12764585U JPH0352321Y2 (en) | 1985-08-20 | 1985-08-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12764585U JPH0352321Y2 (en) | 1985-08-20 | 1985-08-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6236105U JPS6236105U (en) | 1987-03-03 |
| JPH0352321Y2 true JPH0352321Y2 (en) | 1991-11-13 |
Family
ID=31022596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12764585U Expired JPH0352321Y2 (en) | 1985-08-20 | 1985-08-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0352321Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015017422A (en) * | 2013-07-11 | 2015-01-29 | 日本電信電話株式会社 | Reinforced concrete structure |
-
1985
- 1985-08-20 JP JP12764585U patent/JPH0352321Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6236105U (en) | 1987-03-03 |
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