JP2002371372A - Composite structure of galvanized steel material and concrete - Google Patents
Composite structure of galvanized steel material and concreteInfo
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- JP2002371372A JP2002371372A JP2001183051A JP2001183051A JP2002371372A JP 2002371372 A JP2002371372 A JP 2002371372A JP 2001183051 A JP2001183051 A JP 2001183051A JP 2001183051 A JP2001183051 A JP 2001183051A JP 2002371372 A JP2002371372 A JP 2002371372A
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- Japan
- Prior art keywords
- concrete
- steel material
- zinc
- composite structure
- acid
- 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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- Chemical Treatment Of Metals (AREA)
- Coating With Molten Metal (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、亜鉛系めっき鋼材
とコンクリートの複合構造体に関するものであって、さ
らに詳しくは、土木用、建築用に亜鉛めっき鋼材を用
い、これをコンクリートに埋め込み固定して耐久性を向
上させた構造物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite structure of galvanized steel and concrete, and more particularly, to a galvanized steel for civil engineering and construction, which is embedded and fixed in concrete. And a structure having improved durability.
【０００２】[0002]
【従来の技術】一般に、大気腐食環境で用いられる鉄塔
や橋梁、並びに建築物においては、景観上優れているこ
とや数十年にわたる長期の耐久性を持っていること、ま
た、施工時の取り扱い易さなどにより、鋼材に亜鉛めっ
きを施したものが用いられている。これらの亜鉛めっき
を施した鋼材においては、大気中での腐食によりめっき
層の亜鉛が消耗し、地鉄が露出するまでが寿命であり、
その期間は、田園地帯では数十年、海岸に近いところで
も十年以上であることが知られている。2. Description of the Related Art Generally, steel towers, bridges, and buildings used in an atmospheric corrosive environment have excellent landscape, long-term durability for several decades, and handling during construction. For simplicity and the like, a material obtained by performing galvanization on a steel material is used. In these galvanized steel materials, the life of the zinc layer is depleted due to corrosion in the atmosphere and the base iron is exposed,
The period is known to be decades in the countryside and more than ten years near the coast.
【０００３】また、そのめっきの腐食量を減らす手段と
して、様々な検討がされており、たとえば、特開平９−
２５６１３４号公報においては、めっき層にＡｌを添加
することにより腐食量を減らしためっき鋼材の製造に関
して記載されている。これらの方法は、亜鉛めっき層が
屋外の大気環境に曝されていることを前提に考えられた
ものである。また、直接土に埋設された亜鉛めっき鋼管
の防食法に関しては、公開文献として、「日本鉄鋼協会
第１０９回講演大会要旨集、Ｓ４５１に「防食被覆によ
るパンザーマストの埋設部の耐久性向上」に関する記載
がある。[0003] Further, various studies have been made as means for reducing the amount of corrosion of the plating.
No. 256134 describes production of a plated steel material in which the amount of corrosion is reduced by adding Al to a plating layer. These methods are based on the premise that the galvanized layer is exposed to the outdoor atmospheric environment. In addition, regarding the method of preventing corrosion of galvanized steel pipes buried directly in the soil, as a published document, "Summary of the 109th Conference of the Iron and Steel Institute of Japan, S451," There is.
【０００４】[0004]
【発明が解決しようとする課題】上記亜鉛めっきを施し
た鋼材を、鉄塔や建築物、また、橋梁などに適用する場
合にそれらを地面や基礎構造物に固定する必要があり、
その形態として一般的なものはコンクリートに埋め込み
固定する方法である。しかしながら、コンクリートと亜
鉛めっきを施した鋼材の界面で、めっきが選択的に消耗
し、短期間で錆が発生してしまう問題点が生じていた。
そこで、本発明においては、上記コンクリートに埋め込
まれた場合の、コンクリートと亜鉛系めっきを施した鋼
材の間の耐食性を向上させた構造体を提供することを目
的とする。When the galvanized steel material is applied to a steel tower, a building, a bridge, or the like, it is necessary to fix them to the ground or a foundation structure.
A common form is a method of embedding and fixing in concrete. However, there has been a problem that plating is selectively consumed at the interface between concrete and a galvanized steel material and rust is generated in a short period of time.
In view of the above, an object of the present invention is to provide a structure having improved corrosion resistance between concrete and a zinc-plated steel material when embedded in the concrete.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明においては以下の様に構造物を規定する。 （１）亜鉛系のめっきを施した鋼材をコンクリートで固
定する構造体において、鋼材とコンクリートの界面部を
はさんで両側の領域を、めっきの表面に無機酸素酸塩の
化合物を含むアルカリ中和能を持つバインダー層を介
し、その上に有機樹脂被覆層を有することを特徴とする
亜鉛系めっき鋼材とコンクリートの複合構造体。Means for Solving the Problems In order to solve the above problems, the present invention defines a structure as follows. (1) In a structure in which a zinc-plated steel material is fixed with concrete, both sides of the steel material-concrete interface are sandwiched, and alkali neutralization containing an inorganic oxyacid salt compound on the surface of the plating is performed. A composite structure of galvanized steel and concrete, comprising an organic resin coating layer on a binder layer having a function.
【０００６】（２）亜鉛系のめっきを施した鋼材をコン
クリートで固定する構造体において、鋼材とコンクリー
トの界面部をはさんで両側の領域を、アルカリ中和能を
持つ無機酸素酸塩の化合物を含む有機樹脂被覆層をめっ
きとコンクリートの間に有することを特徴とする亜鉛系
めっき鋼材とコンクリートの複合構造体。 （３）アルカリ中和能の指標として、０．１ｍｏｌ／ｋ
ｇのＮａＯＨに対して、モル比で１対１の量の無機酸素
酸塩の化合物を添加した際のｐＨが１０以下であること
を特徴とする前記（１）または（２）記載の亜鉛系めっ
き鋼材とコンクリートの複合構造体。(2) In a structure in which a zinc-plated steel material is fixed with concrete, an area between both sides of an interface between the steel material and the concrete is covered with a compound of an inorganic oxyacid salt having an alkali neutralizing ability. A composite structure of a galvanized steel material and concrete, comprising an organic resin coating layer containing Pb between the plating and the concrete. (3) As an index of alkali neutralization ability, 0.1 mol / k
The zinc system according to (1) or (2), wherein the pH is 10 or less when the inorganic oxyacid salt compound is added in a molar ratio of 1: 1 to g of NaOH. Composite structure of plated steel and concrete.
【０００７】（４）無機酸素酸塩の化合物が、炭酸もし
くは重炭酸、リン酸もしくは亜リン酸、クロム酸もしく
は重クロム酸、珪酸、バナジン酸、タングステン酸、ジ
ルコン酸、モリブデン酸、の１種、またはこれらの２種
以上の化合物の塩を含むことを特徴とする前記（１）〜
（３）のいずれかに記載の亜鉛系めっき鋼材とコンクリ
ートの複合構造体。 （５）亜鉛系のめっきが５質量％以下のＭｇを含有する
ことを特徴とする前記（１）〜（４）のいずれかに記載
の亜鉛系めっき鋼材とコンクリートの複合構造体。(4) The compound of an inorganic oxyacid salt is one of carbonic acid or bicarbonic acid, phosphoric acid or phosphorous acid, chromic acid or dichromic acid, silicic acid, vanadic acid, tungstic acid, zirconic acid and molybdic acid Or a salt of two or more of these compounds.
The composite structure of zinc-coated steel and concrete according to any of (3). (5) The composite structure of a zinc-based plated steel material and concrete according to any one of the above (1) to (4), wherein the zinc-based plating contains 5% by mass or less of Mg.
【０００８】（６）亜鉛系のめっきが６０質量％以下の
Ａｌを含有することを特徴とする前記（１）〜（５）の
いずれかに記載の亜鉛系めっき鋼材とコンクリートの複
合構造体。 （７）Ａｌを含有するめっき鋼材において、Ａｌの１０
分の１以下の質量のＳｉを含有することを特徴とする前
記（６）記載の亜鉛系めっき鋼材とコンクリートの複合
構造体。(6) The composite structure of a zinc-based plated steel material and concrete according to any one of the above (1) to (5), wherein the zinc-based plating contains 60% by mass or less of Al. (7) In a plated steel material containing Al, 10% of Al
The composite structure of galvanized steel and concrete according to the above (6), which contains Si in a mass of 1 / l or less.
【０００９】（８）亜鉛系のめっきを施した鋼材が、鋼
管、もしくは形鋼、もしくは矢板の１種またはそれらを
組み合わせた複合構造体であることを特徴とする前記
（１）〜（７）のいずれかに記載の亜鉛系めっき鋼材と
コンクリートの複合構造体。 （９）有機樹脂被覆層が、アクリル樹脂、尿素樹脂、塩
化ゴム系樹脂、塩化ビニル系樹脂、ポリオレフィン樹
脂、フッ素樹脂もしくは、エポキシ樹脂またはその変性
物を含む樹脂のいずれかであることを特徴とする前記
（１）〜（８）のいずれかに記載の亜鉛系めっき鋼材と
コンクリートの複合構造体にある。(8) The above-mentioned (1) to (7), wherein the zinc-plated steel material is one of a steel pipe, a shape steel, a sheet pile, or a combination thereof. A composite structure of a galvanized steel material and concrete according to any one of the above. (9) The organic resin coating layer is any one of an acrylic resin, a urea resin, a chlorinated rubber resin, a vinyl chloride resin, a polyolefin resin, a fluororesin, or a resin containing an epoxy resin or a modified product thereof. A composite structure of a zinc-based plated steel material and concrete according to any one of the above (1) to (8).
【００１０】[0010]
【発明の実施の形態】上記課題を満足させるために発明
者らは、実際にコンクリートに埋設された亜鉛めっき鋼
材を数多く調査した。その結果、亜鉛めっきを施した鋼
材と表面が大気に露出しているコンクリートの界面近傍
が最も腐食していて、大気中の腐食速度の数倍から数十
倍になっていることを見つけた。この調査結果を基に、
再現試験を行い、腐食している部分を詳細に解析してみ
ると、界面部において腐食が激しく、コンクリートに埋
設されている部分ではあまり腐食が進んでいないこと、
さらに、界面部より数ｃｍ離れて大気に接している部分
においては腐食が軽微であることが分かった。さらに発
明者らは、この界面部位を詳細に観察し、界面部では湿
度が上昇した際に微少量の結露が生じており、これをｐ
Ｈ試験紙で測定したところ、およそ１２のｐＨの値を示
すことを見つけた。BEST MODE FOR CARRYING OUT THE INVENTION In order to satisfy the above problems, the present inventors have investigated a number of galvanized steel materials actually buried in concrete. As a result, it was found that the vicinity of the interface between the galvanized steel and the concrete whose surface was exposed to the atmosphere was corroded most, and was several times to several tens times the corrosion rate in the atmosphere. Based on the findings,
Performing a reproduction test and analyzing the corroded part in detail, it was found that the corrosion was severe at the interface, and that the corrosion was not much advanced in the part buried in concrete,
Further, it was found that corrosion was slight in a portion that was several cm away from the interface and was in contact with the atmosphere. Furthermore, the inventors observed this interface portion in detail, and when the humidity increased, a very small amount of dew condensation occurred at the interface portion.
It was found to exhibit a pH value of approximately 12 as measured on H test paper.
【００１１】その上で本発明者らは、塗装によりこの部
分の腐食を防ぐことを試みた。その結果、短期間では、
効果が認められるが、時間が経つと塗膜の劣化と減耗が
起こり、効果がなくなってしまうことを確認した。この
ことを詳細に検討した結果、本発明者らは、結露水が高
アルカリ化し、それによる塗膜の劣化が原因であること
をつきとめた。そのために、本発明では結露水による高
アルカリ化を防ぐために無機酸素酸塩の化合物を含むア
ルカリ中和能を持つ物質を用いる。ただし、これらの物
質は一般的に水に溶解しやすい化合物であるため、この
物質のみではコンクリートの埋め込む際にほとんどが溶
出してしまいその後の効果が無くなる。[0011] Then, the present inventors tried to prevent corrosion of this portion by painting. As a result, in the short term,
Although the effect was observed, it was confirmed that the coating film deteriorated and depleted over time, and the effect was lost. As a result of examining this in detail, the present inventors have found that dew condensation water is highly alkalinized, and the deterioration of the coating film caused by the alkalinization is caused. For this purpose, in the present invention, a substance having an alkali neutralizing ability containing a compound of an inorganic oxyacid salt is used in order to prevent high alkalinization due to dew condensation water. However, since these substances are generally compounds that are easily dissolved in water, most of these substances are eluted when embedding concrete, and the subsequent effects are lost.
【００１２】そこで、本発明は、亜鉛系のめっきを施し
た鋼材をコンクリートで固定する構造体において、鋼材
とコンクリートの界面部をはさんで両側の領域を、めっ
きの表面に無機酸素酸塩の化合物を含むアルカリ中和能
を持つバインダー層を介し、その上に有機樹脂被覆層を
有することを特徴とする亜鉛系めっき鋼材とコンクリー
トの複合構造体を提供する。この際の界面部をはさんで
両側の領域の大きさについては特に規制するものではな
いが、少なくともコンクリートを敷設するときの水平度
のばらつき、すなわち１ｃｍ以上が望ましい。さらに上
限については特に規定するものではないが、処理コスト
や景観上の課題を含めると界面部から５０ｃｍ以下が望
ましい。Therefore, the present invention provides a structure for fixing a zinc-plated steel material with concrete in a structure on both sides of an interface between the steel material and the concrete, and forming an inorganic oxygenate on the surface of the plating. A composite structure of galvanized steel and concrete characterized by having an organic resin coating layer thereon via a binder layer containing a compound and having an alkali neutralizing ability. At this time, the size of the region on both sides of the interface is not particularly limited, but it is desirable that the horizontality at the time of laying the concrete is at least 1 cm or more. The upper limit is not particularly specified, but is preferably 50 cm or less from the interface in consideration of the processing cost and the problem of the landscape.
【００１３】また、本発明におけるバインダー層並びに
有機樹脂被覆層の製造法に関しては特に規定するもので
はないが、スプレーによる吹き付け、刷毛やローラーに
よる塗りなどを用いた塗装を行うことが一般的である。
また、亜鉛系のめっきの厚みに関しても特に規定するも
のではないが、屋外での腐食速度を考慮すると、１００
ｇ／ｍ2 以上が望ましく、さらにめっき部の割れや外観
不良を起こさない厚みとして１０００ｇ／ｍ2 以下が望
ましい。The method for producing the binder layer and the organic resin coating layer in the present invention is not particularly limited. However, it is common practice to apply the composition by spraying with a spray or applying with a brush or a roller. .
Although the thickness of the zinc-based plating is not particularly specified, it is 100% in consideration of the corrosion rate outdoors.
g / m 2 or more, and more preferably 1000 g / m 2 or less as a thickness that does not cause cracking of the plated portion or poor appearance.
【００１４】さらに、本発明におけるアルカリ中和能を
持つバインダー層の厚みは特に規定するものではない
が、０．１μｍ以上で５００μｍ以下が望ましい。５μ
ｍよりも薄い場合、付着のばらつきにより被覆されてい
ない部分が生じるため、これ以上の厚みが望ましい。ま
た、５００μｍを越えると、バインダー層とその上の有
機樹脂層との応力の差で剥離しやすくなる。また、本発
明における有機樹脂被覆層の厚みに関して特に規定する
ものではないが、１０μｍ以上５ｍｍ未満が望ましい。
１０μｍ未満では、コンクリートを敷設する際に塗膜の
欠陥部からバインダー層の溶出が起こり、その後の効果
が薄れる。また、５ｍｍ以上では、本発明の効果がほと
んど期待できないほど有機樹脂の寿命が長くなってしま
う。Further, the thickness of the binder layer having an alkali neutralizing ability in the present invention is not particularly limited, but is preferably 0.1 μm or more and 500 μm or less. 5μ
If the thickness is smaller than m, an uncovered portion is generated due to a variation in adhesion. On the other hand, if it exceeds 500 μm, the binder layer and the organic resin layer thereover tend to be separated due to the difference in stress. Further, the thickness of the organic resin coating layer in the present invention is not particularly limited, but is preferably 10 μm or more and less than 5 mm.
When the thickness is less than 10 μm, the binder layer is eluted from a defective portion of the coating film when laying the concrete, and the effect thereafter is weakened. On the other hand, when the thickness is 5 mm or more, the life of the organic resin becomes so long that the effect of the present invention can hardly be expected.
【００１５】また、本発明では、亜鉛系のめっきを施し
た鋼材をコンクリートで固定する構造体において、鋼材
とコンクリートの界面部をはさんで両側の領域を、アル
カリ中和能を持つ無機酸素酸塩の化合物を含む有機樹脂
被覆層をめっきとコンクリートの間に有することを特徴
とする亜鉛系めっき鋼材とコンクリートの複合構造体を
提供する。この際の、アルカリ中和能を持つ無機酸素酸
塩の化合物の添加量については特に規定するものではな
いが、０．５質量％以上６０質量％未満が望ましい。
０．５質量％未満であると結露水の中和が十分行われ
ず、アルカリ化してしまう。６０質量％以上では、有機
樹脂被膜がもろくなり、割れが生じて結果的に劣化が進
むことになる。Further, in the present invention, in a structure in which a zinc-plated steel material is fixed with concrete, a region on both sides of an interface between the steel material and the concrete is made of an inorganic oxygen acid having an alkali neutralizing ability. A composite structure of galvanized steel and concrete, comprising an organic resin coating layer containing a salt compound between plating and concrete. At this time, the amount of the inorganic oxyacid salt compound having alkali neutralization ability is not particularly limited, but is preferably 0.5% by mass or more and less than 60% by mass.
If the amount is less than 0.5% by mass, neutralization of dew water is not sufficiently performed, resulting in alkalinization. If it is 60% by mass or more, the organic resin film becomes brittle, cracks occur, and as a result, deterioration proceeds.
【００１６】さらに、この際の有機樹脂被覆層の製造方
法に関しては特に規定するものではないが、有機樹脂を
溶媒で薄めた塗料に無機酸素酸塩の化合物を鹸濁させた
ものを塗布する方法や、有機樹脂の粉末に無機酸素酸塩
の化合物を混練したものを付着させ熱融着させる方法な
どが採用される。さらに本発明では、上記アルカリ中和
能の指標として、０．１ｍｏｌ／ｋｇのＮａＯＨに対し
て、等量比で１対１の量の無機酸素酸塩の化合物を添加
した際のｐＨが１０以下であることを規定する。上記条
件において、１０を越えた場合にでも本発明の効果は無
くなるものではないが、本発明らは、上記構造体の劣化
現象を鋭意検討した結果、無機酸素酸塩の化合物の溶解
度と酸解離定数とを組み合わせた条件で用いることで、
結露水のアルカリ化を防ぎ、結果として亜鉛系のめっき
を施した鋼材の腐食を防ぐことになり、その判断の基準
として０．１ｍｏｌ／ｋｇのＮａＯＨに対して、等量比
で１対１の量の無機酸素酸塩の化合物を添加した際のｐ
Ｈが１０以下であることが重要であることを見つけだし
た。Further, although there is no particular limitation on the method of producing the organic resin coating layer at this time, a method of applying an inorganic oxyacid salt compound to a paint obtained by diluting an organic resin with a solvent is applied. Alternatively, a method in which a compound of an inorganic oxyacid salt is kneaded with an organic resin powder and adhered to each other and heat-fused is employed. Further, in the present invention, as an index of the alkali neutralization ability, the pH when an inorganic oxyacid salt compound is added in an equivalent ratio of 1 to 1 with respect to 0.1 mol / kg of NaOH is 10 or less. Stipulates that Under the above conditions, the effect of the present invention is not lost even when it exceeds 10, but as a result of intensive studies on the deterioration phenomenon of the above-mentioned structure, the solubility and acid dissociation of the compound of the inorganic oxyacid salt were found. By using it in combination with a constant,
This prevents alkalizing of dew water and consequently prevents corrosion of the zinc-plated steel material. As a criterion for the determination, a 0.1: 1 equivalent ratio of NaOH of 0.1 mol / kg is used. P when adding an amount of a compound of an inorganic oxyacid salt
It turned out that it was important that H was 10 or less.
【００１７】さらに本発明では、無機酸素酸塩の化合物
が、炭酸もしくは重炭酸、リン酸もしくは亜リン酸、ク
ロム酸もしくは重クロム酸、珪酸、バナジン酸、タング
ステン酸、ジルコン酸、モリブデン酸、の１種、もしく
はこれらの２種以上の化合物の塩を含むことを特徴とす
る。これらの酸素酸塩は、水に対する溶解度も高くかつ
安定で、有機樹脂やバインダーに混ぜ込んでも反応を起
こしにくいものである。また、これらの化合物はアルカ
リ中和能を有している。Further, according to the present invention, the compound of an inorganic oxyacid salt is selected from the group consisting of carbonic acid or bicarbonate, phosphoric acid or phosphorous acid, chromic acid or dichromic acid, silicic acid, vanadic acid, tungstic acid, zirconic acid and molybdic acid. It is characterized in that it contains a salt of one or two or more of these compounds. These oxyacid salts have high solubility in water and are stable, and hardly cause a reaction even when mixed with an organic resin or a binder. Further, these compounds have alkali neutralizing ability.
【００１８】さらに、前記亜鉛系のめっきが５質量％以
下のＭｇを含有することが好ましい。本発明において、
Ｍｇの添加は亜鉛系めっき層の耐食性の向上を目的と
し、添加量を増加させるほど耐食性の向上が見られる。
しかしながら、本発明で規定する５質量％を越えた場合
ではめっき層がもろくなって亜鉛系めっき層の密着力が
低下し、添加しない場合よりも耐食性が劣化することに
なる。Further, the zinc-based plating preferably contains 5% by mass or less of Mg. In the present invention,
The addition of Mg aims at improving the corrosion resistance of the zinc-based plating layer, and the corrosion resistance is improved as the added amount is increased.
However, when the content exceeds 5% by mass specified in the present invention, the plating layer becomes brittle, the adhesion of the zinc-based plating layer is reduced, and the corrosion resistance is deteriorated as compared with the case where no addition is made.
【００１９】さらに、前記亜鉛系のめっきが６０質量％
以下のＡｌを含有することが好ましい。本発明におい
て、Ａｌの添加は亜鉛系めっき層の耐食性の向上を目的
とし、添加量を増加させるほど耐食性の向上が見られ
る。しかしながら、本発明で規定する６０質量％を越え
た場合では地鉄に対しての防食機能が低下し、添加しな
い場合よりも耐食性が劣化することになる。Further, the zinc-based plating is 60% by mass.
It is preferable to contain the following Al. In the present invention, the addition of Al aims at improving the corrosion resistance of the zinc-based plating layer, and the higher the amount of addition, the more the corrosion resistance is improved. However, when the amount exceeds 60% by mass specified in the present invention, the anticorrosion function against the base iron is reduced, and the corrosion resistance is deteriorated as compared with the case where no iron is added.
【００２０】さらに、前記Ａｌを含有するめっき鋼材に
おいて、Ａｌの１０分の１以下のＳｉを含有することが
好ましい。本発明においてＳｉの添加はめっき層中のＡ
ｌ−Ｆｅ合金層の形成を抑制し、そのことによるめっき
層の密着性向上を目的とする。この際のＳｉの添加量は
合金層の形成を抑制するために添加する方がよいが、Ａ
ｌの１０質量％以下と規定する。この量を超えて添加し
てもＳｉの単独層が析出するだけで、結果的に耐食性を
低下させてしまう。Further, it is preferable that the Al-containing plated steel material contains Si which is 1/10 or less of Al. In the present invention, the addition of Si corresponds to A in the plating layer.
An object is to suppress the formation of the l-Fe alloy layer and thereby improve the adhesion of the plating layer. It is better to add Si at this time in order to suppress the formation of an alloy layer.
It is defined as 10 mass% or less of 1 Even if it is added in excess of this amount, only a single layer of Si will precipitate, resulting in a decrease in corrosion resistance.
【００２１】さらに本発明では、前記亜鉛系のめっきを
施した鋼材が、鋼管、もしくは形鋼、もしくは矢板の１
種またはそれらを組み合わせた複合構造体であることを
規定する。特に鋼管では送電架線用や照明用の鉄柱、広
告塔などである。形鋼では橋梁やビルなどの建築物、矢
板では港湾や河川構造物がそれにあたり、かつ、これら
を組み合わせた建造物が対象となる。Further, in the present invention, the steel material plated with zinc is one of a steel pipe, a shaped steel, and a sheet pile.
It is specified that the composite structure is a species or a combination thereof. In particular, in the case of steel pipes, they are used for power transmission lines, lighting poles, and advertising towers. Shaped steels include buildings such as bridges and buildings, and sheet piles include harbors and river structures, and structures that combine these.
【００２２】さらに本発明では、前記有機樹脂被覆層
が、アクリル樹脂、尿素樹脂、塩化ゴム系樹脂、塩化ビ
ニル系樹脂、ポリオレフィン樹脂、フッ素樹脂もしく
は、エポキシ樹脂またはその変性物を含む樹脂のいずれ
かであることを特徴とする。これらの樹脂は一般的に入
手しやすく、かつ耐久性とりわけ湿気や光による劣化が
少ないことが特徴である。特に本発明においては無機酸
素酸塩が水に溶け出すことを防ぐ役割を持つために加水
分解を起こしにくい樹脂であることが必要となる。Further, in the present invention, the organic resin coating layer may be made of any one of an acrylic resin, a urea resin, a chlorinated rubber resin, a vinyl chloride resin, a polyolefin resin, a fluororesin, or a resin containing an epoxy resin or a modified product thereof. It is characterized by being. These resins are generally easily available, and are characterized by durability, and in particular, less deterioration by moisture and light. In particular, in the present invention, it is necessary that the resin be a resin which does not easily undergo hydrolysis because it has a role of preventing the inorganic oxyacid salt from being dissolved in water.
【００２３】[0023]
【実施例】以下に、本発明の実施例を示す。 （実施例１）図１に示した構成において、下地鋼材をＳ
Ｓ４００鋼で板厚４．５ｍｍ、縦１００ｍｍ、横７０ｍ
ｍのものを用いた。それぞれの膜の構成を表１に示す。
バインダー層、並びに塗装層の長さは５０ｍｍで、この
中央部をコンクリートに埋め込み、１日１回、０．５％
ＮａＣｌ溶液を散布し、屋外で３か月暴露した。試験
後、コンクリート界面を剥離し、その部分の腐食状況を
調査した。その結果をあわせて示す。本発明の実施例で
は、すべてのケースで錆の発生は無く、極めて良好な状
態であり、本発明の効果が実証された。Examples of the present invention will be described below. (Example 1) In the structure shown in FIG.
4.5mm thick, 100mm long, 70m wide with S400 steel
m. Table 1 shows the structure of each film.
The length of the binder layer and the coating layer is 50 mm, and the center part is embedded in concrete and 0.5% once a day.
NaCl solution was sprayed and exposed outdoors for 3 months. After the test, the concrete interface was peeled off, and the corrosion state of that portion was investigated. The results are also shown. In the examples of the present invention, no rust was generated in all cases, and the condition was extremely good, demonstrating the effect of the present invention.
【００２４】[0024]
【表１】 [Table 1]
【００２５】（実施例２）実施例１に用いた亜鉛めっき
鋼材に対し、表２に示したバインダーを１μｍ塗布し、
その上にタールエポキシ塗装を２００μｍ施した。バイ
ンダー層、並びに塗装層の長さは５０ｍｍで、この中央
部をコンクリートに埋め込み、１日１回、０．５％Ｎａ
Ｃｌ溶液を散布し、屋外で３か月暴露した。試験後、コ
ンクリート界面を剥離し、その部分の腐食状況を調査し
た。本発明の比較例では赤錆の発生が認められた。すな
わち、本発明の効果が極めて有効であることが示され
た。(Example 2) The binder shown in Table 2 was applied to the galvanized steel material used in Example 1 by 1 μm,
A tar epoxy coating was applied thereon to 200 μm. The length of the binder layer and the coating layer is 50 mm, and the center portion is embedded in concrete, and is 0.5% Na once a day.
Cl solution was sprayed and exposed outdoors for 3 months. After the test, the concrete interface was peeled off, and the corrosion state of that portion was investigated. In the comparative example of the present invention, generation of red rust was recognized. That is, it was shown that the effect of the present invention was extremely effective.
【００２６】[0026]
【表２】 [Table 2]
【００２７】（実施例３）板厚６ｍｍ外径１５０ｍｍ、
長さ１ｍの鋼管、板厚６ｍｍフランジ幅１００ｍ、長さ
１ｍのＨ形鋼にそれぞれ溶融亜鉛めっきを施した。これ
らを、下端から３００ｍｍの部分までコンクリートに埋
設した。埋設部の界面より上下１５０ｍｍの長さの部分
にエポキシ樹脂の粉体塗装を厚さ２５０μｍ施した。エ
ポキシ樹脂の粉体には、あらかじめ質量％で３０％にな
るようにバナジン酸アンモニウムを混練しておいた。比
較材として、亜鉛めっきのＬアングル材にタールエポキ
シ塗料を１５０μｍ施したものも同時に埋設した。埋設
した箇所は、東京湾の海岸から５ｍの場所で、１年の暴
露期間の後に調査した結果、比較材のコンクリートとめ
っき鋼材界面で赤錆の発生が見られたが、本発明の鋼材
では全く異常が認められなかった。これより本発明の有
効性が確認された。(Embodiment 3) 6 mm thick, 150 mm outer diameter,
Hot-dip galvanizing was applied to a 1-m-long steel pipe, a 6-mm-thick H-shaped steel having a flange thickness of 100 m and a length of 1 m. These were buried in concrete up to 300 mm from the lower end. A portion having a length of 150 mm above and below the interface of the buried portion was powder-coated with an epoxy resin by a thickness of 250 μm. Ammonium vanadate was previously kneaded to the epoxy resin powder so that the amount by mass was 30%. As a comparative material, a galvanized L-angle material coated with 150 μm of tar epoxy paint was also buried at the same time. The buried area was 5 m from the shore of Tokyo Bay and was examined after a one-year exposure period. As a result, red rust was observed at the interface between the concrete and the plated steel material of the comparative material. No abnormalities were observed. This confirmed the effectiveness of the present invention.
【００２８】（実施例４）板厚６ｍｍ、最大外径１９０
ｍｍ、長さ５ｍのテーパー付き鋼管に溶融亜鉛めっきを
施した。これの下端より１ｍの部分を中心に、長さ３０
０ｍｍにわたってクロム酸、リン酸、珪酸を含む水溶液
を塗布し、ドライヤーで乾燥させた。乾燥後の厚みは、
０．８μｍであった。この部分にタールエポキシ塗料を
１５０μｍ塗布した。土中に深さ１．５ｍ、直径１ｍの
穴を開け、この中にテーパー付き鋼管の下端１ｍの部位
が地面になるように、コンクリートで埋設した。本鋼管
は、駐車場用の照明ポールとして６年間使用中である
が、埋設部の界面は全く腐食が認められない。(Embodiment 4) A plate thickness of 6 mm and a maximum outer diameter of 190
Hot dip galvanization was applied to a tapered steel pipe having a length of 5 mm and a length of 5 mm. It is 30m long, centered on the part 1m from the lower end.
An aqueous solution containing chromic acid, phosphoric acid, and silicic acid was applied over 0 mm, and dried with a dryer. The thickness after drying is
It was 0.8 μm. 150 μm of a tar epoxy paint was applied to this portion. A hole having a depth of 1.5 m and a diameter of 1 m was formed in the soil, and the hole was buried with concrete so that a portion at a lower end of the tapered steel pipe at a position of 1 m was on the ground. This steel pipe has been used as a lighting pole for parking lots for 6 years, but no corrosion is observed at the interface of the buried part.
【００２９】[0029]
【発明の効果】以上の説明に示したように、本発明の構
造体は、厳しい腐食環境においてもコンクリートと亜鉛
系めっき鋼材の界面での腐食が発生せず、長期の耐久性
を有する。本発明を用いることにより、長期間劣化する
ことのない構造物が製造でき、社会に対する安全性を与
えることができる。As described above, the structure of the present invention does not cause corrosion at the interface between concrete and galvanized steel even in a severely corrosive environment, and has long-term durability. By using the present invention, a structure that does not deteriorate for a long time can be manufactured, and safety for society can be provided.
【図１】実施例で用いた構造体の構成を示す図である。FIG. 1 is a diagram showing a configuration of a structure used in an example.
１ 下地鋼材 ２ 亜鉛系めっき層 ３ バインダー層 ４ 有機樹脂層 ５ コンクリート DESCRIPTION OF SYMBOLS 1 Base steel material 2 Zinc plating layer 3 Binder layer 4 Organic resin layer 5 Concrete
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ２３Ｃ 28/00 Ｃ２３Ｃ 28/00 Ａ Ｃ (72)発明者 山中 晋太郎 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 Ｆターム(参考） 4K026 AA02 AA07 AA13 BA03 BA06 BA12 BB08 CA16 CA22 CA23 CA29 EB05 4K027 AA07 AA08 AA22 AB43 AB44 AC82 AE03 4K044 AA02 BA11 BA15 BA17 BA21 CA11 CA16 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (Reference) C23C 28/00 C23C 28/00 AC (72) Inventor Shintaro Yamanaka 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation F-term in the Company Technology Development Division (reference) 4K026 AA02 AA07 AA13 BA03 BA06 BA12 BB08 CA16 CA22 CA23 CA29 EB05 4K027 AA07 AA08 AA22 AB43 AB44 AC82 AE03 4K044 AA02 BA11 BA15 BA17 BA21 CA11 CA16
Claims (9)
ートで固定する構造体において、鋼材とコンクリートの
界面部をはさんで両側の領域を、めっきの表面に無機酸
素酸塩の化合物を含むアルカリ中和能を持つバインダー
層を介し、その上に有機樹脂被覆層を有することを特徴
とする亜鉛系めっき鋼材とコンクリートの複合構造体。In a structure for fixing a zinc-plated steel material with concrete, a region on both sides of an interface between the steel material and the concrete is coated with an alkali containing a compound of an inorganic oxyacid salt on the surface of the plating. A composite structure of galvanized steel and concrete, comprising a binder layer having a neutralizing ability and an organic resin coating layer thereon.
ートで固定する構造体において、鋼材とコンクリートの
界面部をはさんで両側の領域を、アルカリ中和能を持つ
無機酸素酸塩の化合物を含む有機樹脂被覆層をめっきと
コンクリートの間に有することを特徴とする亜鉛系めっ
き鋼材とコンクリートの複合構造体。2. A structure in which a zinc-plated steel material is fixed with concrete. In both sides of an interface between the steel material and the concrete, a compound of an inorganic oxyacid salt having an alkali neutralizing ability is formed. A composite structure of galvanized steel and concrete, characterized by having an organic resin coating layer between the plating and concrete.
ｏｌ／ｋｇのＮａＯＨに対して、モル比で１対１の量の
無機酸素酸塩の化合物を添加した際のｐＨが１０以下で
あることを特徴とする請求項１または２記載の亜鉛系め
っき鋼材とコンクリートの複合構造体。3. An index of alkali neutralization ability of 0.1 m
The zinc-based plating according to claim 1 or 2, wherein the pH of the inorganic oxyacid salt compound in a molar ratio of 1 to 1 with respect to ol / kg of NaOH is 10 or less. Composite structure of steel and concrete.
重炭酸、リン酸もしくは亜リン酸、クロム酸もしくは重
クロム酸、珪酸、バナジン酸、タングステン酸、ジルコ
ン酸、モリブデン酸、の１種、またはこれらの２種以上
の化合物の塩を含むことを特徴とする請求項１〜３のい
ずれかに記載の亜鉛系めっき鋼材とコンクリートの複合
構造体。4. The compound of an inorganic oxyacid salt is one of carbonic acid or bicarbonate, phosphoric acid or phosphorous acid, chromic acid or dichromic acid, silicic acid, vanadic acid, tungstic acid, zirconic acid, and molybdic acid. The composite structure of a zinc-based plated steel material and concrete according to any one of claims 1 to 3, further comprising a salt of at least two of these compounds.
含有することを特徴とする請求項１〜４のいずれかに記
載の亜鉛系めっき鋼材とコンクリートの複合構造体。5. The composite structure of a zinc-plated steel material and concrete according to claim 1, wherein the zinc-based plating contains 5% by mass or less of Mg.
を含有することを特徴とする請求項１〜５のいずれかに
記載の亜鉛系めっき鋼材とコンクリートの複合構造体。6. An aluminum alloy having a zinc-based plating content of 60% by mass or less.
The composite structure of a zinc-based plated steel material and concrete according to any one of claims 1 to 5, further comprising:
ｌの１０分の１以下の質量のＳｉを含有することを特徴
とする請求項６記載の亜鉛系めっき鋼材とコンクリート
の複合構造体。7. A plated steel material containing Al, wherein A
7. The composite structure of galvanized steel and concrete according to claim 6, which contains Si in a mass of 1/10 or less of l.
もしくは形鋼、もしくは矢板の１種またはそれらを組み
合わせた複合構造体であることを特徴とする請求項１〜
７のいずれかに記載の亜鉛系めっき鋼材とコンクリート
の複合構造体。8. A steel pipe provided with zinc-based plating is a steel pipe,
Or a composite structure obtained by combining one of steel or sheet piles or a combination thereof.
7. A composite structure of a zinc-based plated steel material and concrete according to any one of 7.
樹脂、塩化ゴム系樹脂、塩化ビニル系樹脂、ポリオレフ
ィン樹脂、フッ素樹脂もしくは、エポキシ樹脂またはそ
の変性物を含む樹脂のいずれかであることを特徴とする
請求項１〜８のいずれかに記載の亜鉛系めっき鋼材とコ
ンクリートの複合構造体。9. The organic resin coating layer is one of an acrylic resin, a urea resin, a chlorinated rubber resin, a vinyl chloride resin, a polyolefin resin, a fluororesin, or a resin containing an epoxy resin or a modified product thereof. A composite structure of a galvanized steel material and concrete according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001183051A JP3911136B2 (en) | 2001-06-18 | 2001-06-18 | Composite structure of galvanized steel and concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001183051A JP3911136B2 (en) | 2001-06-18 | 2001-06-18 | Composite structure of galvanized steel and concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002371372A true JP2002371372A (en) | 2002-12-26 |
| JP3911136B2 JP3911136B2 (en) | 2007-05-09 |
Family
ID=19023053
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001183051A Expired - Fee Related JP3911136B2 (en) | 2001-06-18 | 2001-06-18 | Composite structure of galvanized steel and concrete |
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| Country | Link |
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| JP (1) | JP3911136B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1657325A1 (en) * | 2004-11-04 | 2006-05-17 | Nippon Steel Corporation | Steel post embedded in the ground having corrosion control property |
| JP2006161291A (en) * | 2004-12-02 | 2006-06-22 | Oriental Construction Co Ltd | Waterproofing structure of concrete steel member interface |
| CN103755223A (en) * | 2013-12-19 | 2014-04-30 | 柳州正菱集团有限公司 | Concrete interface treating agent |
| JP2020196938A (en) * | 2019-06-04 | 2020-12-10 | 日本製鉄株式会社 | Composite structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108821791A (en) * | 2018-07-09 | 2018-11-16 | 苏州热工研究院有限公司 | A kind of electrochemical dechlorination device and method of armored concrete |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1657325A1 (en) * | 2004-11-04 | 2006-05-17 | Nippon Steel Corporation | Steel post embedded in the ground having corrosion control property |
| JP2006161291A (en) * | 2004-12-02 | 2006-06-22 | Oriental Construction Co Ltd | Waterproofing structure of concrete steel member interface |
| JP4525974B2 (en) * | 2004-12-02 | 2010-08-18 | オリエンタル白石株式会社 | Waterproof structure of concrete steel interface |
| CN103755223A (en) * | 2013-12-19 | 2014-04-30 | 柳州正菱集团有限公司 | Concrete interface treating agent |
| JP2020196938A (en) * | 2019-06-04 | 2020-12-10 | 日本製鉄株式会社 | Composite structure |
| JP7352065B2 (en) | 2019-06-04 | 2023-09-28 | 日本製鉄株式会社 | composite structure |
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| JP3911136B2 (en) | 2007-05-09 |
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