JP2020002437A - Corrosion control method of steel structure - Google Patents

Corrosion control method of steel structure Download PDF

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JP2020002437A
JP2020002437A JP2018123556A JP2018123556A JP2020002437A JP 2020002437 A JP2020002437 A JP 2020002437A JP 2018123556 A JP2018123556 A JP 2018123556A JP 2018123556 A JP2018123556 A JP 2018123556A JP 2020002437 A JP2020002437 A JP 2020002437A
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steel structure
opening
anode material
metal rod
water
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JP6948290B2 (en
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松本　巧
Takumi Matsumoto
巧 松本
修二 石原
Shuji Ishihara
修二 石原
重信 貝沼
Shigenobu Kainuma
重信 貝沼
彬 兼子
Akira Kaneko
彬 兼子
龍明 住谷
Tatsuaki Sumiya
龍明 住谷
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Kyushu University NUC
Japan Exlan Co Ltd
Nippon Light Metal Co Ltd
Mitsui E&S Machinery Co Ltd
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Kyushu University NUC
Japan Exlan Co Ltd
Nippon Light Metal Co Ltd
Mitsui E&S Machinery Co Ltd
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  • Prevention Of Electric Corrosion (AREA)

Abstract

To provide a corrosion control method of a steel structure good in handleability and capable of suppressing weight increase rate of a structure.SOLUTION: A first aperture 22 is arranged in an upper part of a steel structure 20, and a second aperture 24 smaller than the first aperture 22 is arranged in a side part, the second aperture 24 is encapsulated by arranging an anode material 10 by arranging a water holding fiber 14 around an outer periphery of a metal bar 12 having poorer electric potential than a steel structure 20 in the steel structure 20 from the first aperture 22, and fixing the same at a state by conducting conduction of the metal bar 12 and the steel structure 20 via the second aperture 24.SELECTED DRAWING: Figure 1

Description

本発明は、鋼構造物の防食工法に係り、特に、閉塞断面における鋼部材の腐食を抑制する事に好適な防食工法に関する。   The present invention relates to an anticorrosion method for a steel structure, and more particularly to an anticorrosion method suitable for suppressing corrosion of a steel member in a closed section.

標識や照明柱、鋼管杭、都市内高架橋の鋼製高欄などの鋼構造物の閉塞部である内側面には、著しい腐食損傷が生じる場合がある。この損傷は、海塩や、凍結防止剤等の塩化物を含む雨水や、結露水が部材内部に長期間滞水することが主原因となり発生するケースが多いとされている。   Significant corrosion damage may occur on the inner surface that is the closed part of steel structures such as signs, lighting columns, steel pipe piles, and steel railings in urban viaducts. It is said that this damage is often caused mainly by rainwater containing chloride such as sea salt and anti-freezing agent and dew condensation water staying inside the member for a long time.

こうした構造物では、外側面においては、塗装やメッキ等による防食対策が施されることが一般的であるが、既設構造物の内部にメッキや塗装を欠陥なく施す事は困難とされている。このため、鋼構造物の閉塞部である内側面の防食対策には、種々の工夫が必要とされている。例えば、特許文献１には、既設鋼管内部の防食を図る技術が開示されている。特許文献１に開示されている技術は、鋼管を切断し、内部に、鋼管構成部材よりも卑な電位を持つ金属（卑な金属）の微小粒を充填し、切断した鋼管を元に戻すというものである。   In such a structure, anticorrosion measures such as painting and plating are generally applied to the outer surface. However, it is difficult to apply plating and painting to existing structures without defects. For this reason, various measures are required for anticorrosion measures on the inner surface, which is the closed portion of the steel structure. For example, Patent Literature 1 discloses a technique for preventing corrosion inside an existing steel pipe. The technique disclosed in Patent Document 1 cuts a steel pipe, fills the inside with fine particles of a metal (base metal) having a lower potential than a steel pipe constituent member, and returns the cut steel pipe to its original state. Things.

このような技術によれば、鋼管内部に充填した金属の微小粒がアノードとなって鋼管内面を陰極防食すると共に、アノード溶解した微小粒が水酸化物となって保護被膜を形成し、防食性を高めるとされている。   According to such a technique, the fine particles of the metal filled in the steel pipe serve as an anode to cathodic protect the inner surface of the steel pipe, and the fine particles dissolved in the anode serve as hydroxide to form a protective coating, thereby preventing corrosion. It is said to increase.

特開２０００−１２９４７３号公報JP 2000-129473 A

特許文献１に開示されているような技術によれば、確かに鋼構造物の内部における防食に一定の効果があると考えられる。ここで、特許文献１に開示されているような技術は特に、標識や照明柱等の比較的小型な構造物には有効であると考えられる。一方で、高架橋の鋼製高欄など、大型構造物の場合、金属の微小粒を大量に使用することとなり、構造物自体の重量増加割合が大きくなってしまう可能性がある。また、その特性上、まとまりとして扱う事ができず、取扱い性が悪いといった問題がある。
そこで本発明では、取扱い性を良好とし、かつ構造物の重量増加割合を低く抑える事のできる鋼構造物の防食工法を提供することを目的とする。 According to the technique disclosed in Patent Literature 1, it is considered that there is a certain effect in preventing corrosion inside the steel structure. Here, the technique disclosed in Patent Document 1 is considered to be particularly effective for relatively small structures such as signs and lighting poles. On the other hand, in the case of a large structure such as a steel bridge with a viaduct, a large amount of metal fine particles are used, and the weight increase rate of the structure itself may increase. Also, due to its characteristics, it cannot be handled as a unit, and there is a problem that handling is poor.
In view of the above, an object of the present invention is to provide a method for preventing corrosion of a steel structure, which has good handleability and can keep the weight increase rate of the structure low.

上記目的を達成するための本発明に係る鋼構造物の防食工法は、鋼構造物の上部に第１開口部を設けると共に、側部に前記第１開口部よりも小さな第２開口部を設け、前記鋼構造物よりも卑な電位を有する金属棒の外周に保水性繊維を配置した陽極材を前記第１開口部から前記鋼構造物の内部に配置すると共に、前記第２開口部を介して前記金属棒と前記鋼構造物との導通を図った状態で固定することで前記第２開口部を封止することを特徴とする。   In order to achieve the above object, a method for preventing corrosion of a steel structure according to the present invention includes providing a first opening at an upper portion of a steel structure and providing a second opening smaller than the first opening at a side portion. An anode material having water-retaining fibers disposed on the outer periphery of a metal rod having a lower potential than the steel structure is disposed inside the steel structure from the first opening and through the second opening. In this case, the second opening is sealed by fixing the metal rod and the steel structure in a state where conduction is achieved.

また、上記のような特徴を有する鋼構造物の防食工法において前記金属棒の外周には、前記保水性繊維に突き刺さる棘が備えられているようにすると良い。このような特徴を有する事によれば、金属棒に対する保水性繊維の位置ズレを防止することができる。   Further, in the method for preventing corrosion of a steel structure having the above-described features, it is preferable that the outer periphery of the metal rod is provided with a barb that pierces the water-retaining fiber. According to such a feature, it is possible to prevent displacement of the water retention fiber with respect to the metal rod.

上記のような特徴を有する鋼構造物の防食工法によれば、取扱い性を良好とし、かつ構造物の重量増加割合を低く抑える事ができる。   According to the anticorrosion method for a steel structure having the above-described characteristics, it is possible to improve the handleability and to suppress the rate of weight increase of the structure.

実施形態に係る陽極材を円筒状の鋼構造物に挿入、配置した状態を示す斜視図である。It is a perspective view showing the state where an anode material concerning an embodiment was inserted and arranged in a cylindrical steel structure. 実施形態に係る陽極材の構造を説明するための部分断面図である。It is a partial sectional view for explaining the structure of the anode material concerning an embodiment. 実施形態に係る陽極材の変形例を示す図である。It is a figure showing the modification of the anode material concerning an embodiment. 陽極材を小型な鋼構造物に挿入、配置する防食工法の流れを示す図である。It is a figure which shows the flow of the anticorrosion construction method which inserts and arranges an anode material in a small steel structure. 陽極材を大型な鋼構造物に挿入、配置する防食工法を説明するための斜視図である。It is a perspective view for explaining the anticorrosion construction method which inserts and arranges an anode material in a large steel structure. 大型な鋼構造物に陽極材を複数挿入、配置する場合の例を示す平面図である。It is a top view which shows the example at the time of inserting and arrange | positioning several anode materials in a large steel structure.

以下、本発明の鋼構造物の防食工法に係る実施の形態について、図面を参照して詳細に説明する。なお、以下に示す実施の形態は、本発明の鋼構造物の防食工法を実施する上で好適な実施形態の一部であり、その機能を逸脱しない範囲において、各要素の形態や施工の順番を変更したとしても、本発明の一部とみなすことができる。   Hereinafter, embodiments of a method for preventing corrosion of a steel structure according to the present invention will be described in detail with reference to the drawings. The embodiment described below is a part of a preferred embodiment for carrying out the anticorrosion method of a steel structure of the present invention, and the form and order of construction of each element are not deviated from the functions thereof. Can be regarded as a part of the present invention.

［陽極材］
まず、図１、図２を参照して、本発明に適用する陽極材１０の構成について説明する。本形態に係る陽極材１０は、金属棒１２と、保水性繊維１４を基本として構成されている。金属棒１２は、犠牲陽極としての役割を果たし、防食処理の対象となる鋼構造物２０よりも卑な電位を持つ金属により構成されていれば良い。鋼構造物２０を鉄（Ｆｅ）とした場合、金属棒１２は、アルミニウム（Ａｌ）や亜鉛（Ｚｎ）、またアルミニウム合金やマグネシウム合金などとすれば良い。加工容易性や原料コスト等を加味した場合、アルミニウム−亜鉛合金（Ａｌ−Ｚｎ）等とすることが望ましい。 [Anode material]
First, the configuration of the anode material 10 applied to the present invention will be described with reference to FIGS. The anode material 10 according to this embodiment is configured based on a metal rod 12 and a water-retaining fiber 14. The metal rod 12 may serve as a sacrificial anode and may be made of a metal having a lower potential than the steel structure 20 to be subjected to the anticorrosion treatment. When the steel structure 20 is iron (Fe), the metal rod 12 may be aluminum (Al), zinc (Zn), an aluminum alloy, a magnesium alloy, or the like. In consideration of the ease of processing and the cost of raw materials, it is desirable to use an aluminum-zinc alloy (Al-Zn) or the like.

保水性繊維１４は、保水性を持つ部材であれば良く、例えば、布、紙、編織物、および不織布などとすることができる。また、保水性繊維１４には、親水性官能基を有する繊維を含むことができる。具体的には、繊維中、あるいは繊維表面に、−ＳＯ３Ｈ、−ＣＯＯＨ、−ＮＨ３、−ＣＯＮＨ２、−ＣＨＯ、−ＳＨ、−ＯＨなどの親水性官能基を有するものであれば良い。このような組成の繊維であれば、繊維中、あるいは繊維間に水分を保持することができるからである。親水性官能基を有する繊維としては、レーヨン、綿、ビニロン、ナイロン、羊毛、アクリレートなどを挙げることができる。 The water-retaining fiber 14 may be a member having water-retention, and may be, for example, cloth, paper, knitted fabric, non-woven fabric, or the like. Further, the water-retaining fiber 14 may include a fiber having a hydrophilic functional group. Specifically, fibers, or the fiber surface, -SO3H, -COOH, -NH 3, -CONH 2, -CHO, -SH, as long as it has a hydrophilic functional group such as -OH. This is because fibers having such a composition can retain moisture in the fibers or between the fibers. Examples of the fiber having a hydrophilic functional group include rayon, cotton, vinylon, nylon, wool, and acrylate.

実施形態に係る陽極材１０は、上記のような構成の金属棒１２の外周に、上記のような構成の保水性繊維１４を配置することにより構成されている。保水性繊維１４の配置手段は、特に限定されるものでは無く、図２に示すように、金属棒１２の外周に、シート状の保水性繊維１４を巻き付けるようにしても良いし、金属棒１２をシート状、あるいはブロック状の保水性繊維１４で挟み込むようにしても良い（当該形態は、不図示）。   The anode material 10 according to the embodiment is configured by arranging the water retention fibers 14 having the above configuration on the outer periphery of the metal rod 12 having the above configuration. The arrangement of the water-retaining fibers 14 is not particularly limited. As shown in FIG. 2, the sheet-like water-retaining fibers 14 may be wound around the outer periphery of the metal rod 12, May be sandwiched between sheet-shaped or block-shaped water-retaining fibers 14 (this form is not shown).

このような構成の陽極材１０は、使用時には、保水性繊維１４に電解液が含浸される。電解液としては、防食対象とする鋼構造物２０と金属棒１２との間に防食電流が生じるもの、すなわちイオンの移動を生じさせるものであれば良いが、現実には、雨水や大気中の湿分が機能を受け持つ。   When the anode material 10 having such a configuration is used, the water retention fibers 14 are impregnated with the electrolytic solution. The electrolytic solution may be any that produces an anticorrosion current between the steel structure 20 to be anticorrosion and the metal rod 12, that is, one that causes the movement of ions. Moisture is responsible for the function.

なお、実施形態に係る陽極材１０の金属棒１２は、導電性部材１６により、鋼構造物２０と接続されることとなる。導電性部材１６は、可撓性を有する導線等とすることもできるが、本実施形態では、鋼構造物２０に固定することで、陽極材１０の位置決めを図る支持具としての役割を担う要素としている。   The metal bar 12 of the anode material 10 according to the embodiment is connected to the steel structure 20 by the conductive member 16. The conductive member 16 may be a flexible conductive wire or the like. In the present embodiment, the conductive member 16 is fixed to the steel structure 20 to serve as a support for positioning the anode material 10. And

［変形例］
このようにして、金属棒１２の外周に保水性繊維１４を配置する形態を採る場合、金属棒１２の外周には、図３に示すような棘１２ａを備えるようにしても良い。棘１２ａは、金属棒１２を基端として放射状に複数配置すると良く、その配置形態は、特に問うものでは無い。金属棒１２の外周に棘１２ａを設け、この棘１２ａに保水性繊維１４を絡める（突き刺す）ように配置することで、金属棒１２と保水性繊維１４との位置にズレが生じ難くなる。このため、金属棒１２を垂直に配置した場合に、自重作用により保水性繊維１４が金属棒１２の下半部に偏ることを抑制することができる。なお、図３には、棘１２ａについて、形式的に針状のものを示しているが、棘１２ａは、保水性繊維１４の位置ズレ防止効果を奏することができるものであれば、針状以外の形態とすることもできる。 [Modification]
In the case where the water retaining fibers 14 are arranged on the outer periphery of the metal rod 12 in this way, the outer periphery of the metal rod 12 may be provided with barbs 12a as shown in FIG. The plurality of barbs 12a may be radially arranged with the metal rod 12 as a base end, and the arrangement form is not particularly limited. By providing the barbs 12a on the outer periphery of the metal bar 12 and arranging (piercing) the water-retaining fibers 14 on the barbs 12a, the position between the metal bar 12 and the water-retaining fibers 14 is less likely to be shifted. Therefore, when the metal rods 12 are vertically arranged, it is possible to suppress the water retention fibers 14 from being biased toward the lower half of the metal rods 12 due to their own weight. In FIG. 3, the barbs 12 a are formally shown as needles, but the barbs 12 a may be any other than the needles as long as the barbs 12 a can exert the effect of preventing the water retaining fibers 14 from being displaced. It can also be in the form of

［鋼構造物への適用１］
次に、上記のような特徴を有する陽極材１０を鋼構造物２０へ設置する防食工法について説明する。まず、鋼構造物２０が、標識や照明柱など、比較的小型で、断面形状を円筒型とする場合の例について説明する。
鋼構造物２０が図４（Ａ）に示す標識中のような既設構造物である場合、図４（Ｂ）に示すように、鋼構造物２０における防食対象領域よりも上部側の領域を切断し、第１開口部２２を形成する。標識柱や照明柱の場合、滞水し易い根本部分の腐食進行が大きくなる傾向があり、構造物全体に防食を施す必要性が低いからである。次に、切断した鋼構造物２０の下半部における側壁部に、導電性部材１６を固定するための第２開口部２４を形成する。ここで、第１開口部２２は、鋼構造物２０に対して陽極材１０を挿入するための開口部である。これに対し、第２開口部２４は、導電性部材１６を挿通、固定するための開口部である。よって、第２開口部２４は、第１開口部２２に比べて小さな開口部となる。 [Application 1 to steel structures]
Next, the anticorrosion method of installing the anode material 10 having the above-described characteristics on the steel structure 20 will be described. First, an example in which the steel structure 20 is relatively small, such as a sign or a lighting column, and has a cylindrical cross section will be described.
In the case where the steel structure 20 is an existing structure as shown in the sign shown in FIG. 4 (A), as shown in FIG. 4 (B), a region above the anticorrosion target region in the steel structure 20 is cut. Then, the first opening 22 is formed. This is because, in the case of a signpost or a lighting column, the progress of corrosion of the root portion, which is likely to be stagnant, tends to increase, and it is not necessary to provide anticorrosion to the entire structure. Next, a second opening 24 for fixing the conductive member 16 is formed in the side wall of the cut lower half of the steel structure 20. Here, the first opening 22 is an opening for inserting the anode material 10 into the steel structure 20. On the other hand, the second opening 24 is an opening for inserting and fixing the conductive member 16. Therefore, the second opening 24 is a smaller opening than the first opening 22.

次に、図４（Ｂ）に示すように、鋼構造物２０の内部に陽極材１０を挿入、配置する。この時、金属棒１２の外周に配置する保水性繊維１４は、陽極材１０を鋼構造物２０の内部に配置した際、鋼構造物２０の内壁に接することとなるように、密に配置する。金属棒１２と鋼構造物２０との間に配置する部材を保水性繊維１４とすることで、柔軟性を持った繊維が両部材に良好に密着することとなり、防食効果を高めることが可能となる。なお、保水性繊維１４の配置範囲は、限定するものではないが、金属棒１２を長手方向に覆う範囲とすることで、広い範囲における防食効果を奏することが可能となる。   Next, as shown in FIG. 4 (B), the anode material 10 is inserted and arranged inside the steel structure 20. At this time, the water retention fibers 14 arranged on the outer periphery of the metal rod 12 are densely arranged so that the anode material 10 is in contact with the inner wall of the steel structure 20 when the anode material 10 is arranged inside the steel structure 20. . By using the water-retaining fiber 14 as a member disposed between the metal rod 12 and the steel structure 20, the flexible fiber can be in good contact with both members, and the anticorrosion effect can be enhanced. Become. In addition, the arrangement range of the water-retaining fiber 14 is not limited, but by setting the metal rod 12 in a range that covers the metal rod 12 in the longitudinal direction, it is possible to achieve a wide range of anticorrosion effects.

導電性部材１６は、第２開口部２４を貫通するように配置し、ナット１８等を介して鋼構造物２０との導電性が確保された状態で固定される。このため、第２開口部２４は、導電性部材１６の固定と共に封止されることとなる。上述したように、本実施形態において導電性部材１６は、金属棒１２の支持具としての役割を担う。このため、第２開口部２４を介して鋼構造物２０に導電性部材１６を固定することで、鋼構造物２０の内部において、金属棒１２を含む陽極材１０の位置決めが成される。   The conductive member 16 is disposed so as to penetrate the second opening 24, and is fixed via the nut 18 and the like in a state where conductivity with the steel structure 20 is secured. For this reason, the second opening 24 is sealed together with the fixing of the conductive member 16. As described above, in the present embodiment, the conductive member 16 plays a role as a support for the metal bar 12. Therefore, by fixing the conductive member 16 to the steel structure 20 via the second opening 24, the anode material 10 including the metal rod 12 is positioned inside the steel structure 20.

このような配置形態において、保水性繊維１４に電解液を含浸させることで、鋼構造物２０と金属棒１２との間には、金属棒１２を陽極、鋼構造物２０を陰極とした防食電流が生じることとなる。これにより、金属棒１２では酸化反応、鋼構造物２０では還元反応が生じ、鋼構造物２０の内壁面の防食を図ることが可能となる。   In such an arrangement, by impregnating the water-retaining fiber 14 with the electrolytic solution, an anticorrosion current between the steel structure 20 and the metal rod 12 is obtained by using the metal rod 12 as an anode and the steel structure 20 as a cathode. Will occur. Accordingly, an oxidation reaction occurs in the metal rod 12 and a reduction reaction occurs in the steel structure 20, thereby making it possible to prevent corrosion of the inner wall surface of the steel structure 20.

上述のようにして鋼構造物２０の内部に陽極材１０を設置した後、第１開口部２２を形成するために切断した鋼構造物２０の上半部を、図４（Ｄ）に示すように、鋼構造物２０の下半部に接合することで、鋼構造物２０を元の状態に戻す。   After the anode material 10 is installed inside the steel structure 20 as described above, the upper half of the steel structure 20 cut to form the first opening 22 is shown in FIG. Then, the steel structure 20 is returned to the original state by being joined to the lower half of the steel structure 20.

［鋼構造物への適用２］
次に、上記のような特徴を有する陽極材１０を、高架橋の鋼製高欄などの大型構造物に適用する場合の防食工法について説明する。
本形態の鋼構造物２０は、図５に示すような高架橋の高欄のような、矩形断面を有する箱体とする。鋼構造物２０がこのような形態である場合、天板部分に、陽極材１０を挿入するための第１開口部２２を形成する。また、上記形態と同様に、箱体の側壁の下半部には、導電性部材１６を挿通、固定するための第２開口部２４を形成する。なお、天板部分が取り外せる場合には、天板を取り外す事で第１開口部２２を構成しても良い。ここで、図５に示すように、断面形状の縦横比が異なり、いわゆる幅広構造である場合、図６に示すように、１つの鋼構造物２０に対して複数の陽極材１０を配置する。このため、第１開口部２２は、大きな面積を持つ１つの開口部とすることができるが、第２開口部２４は、配置する陽極材１０の数に対応して複数設けるようにする。 [Application 2 to steel structures]
Next, a description will be given of an anticorrosion method in the case where the anode material 10 having the above-described characteristics is applied to a large structure such as a viaduct steel railing.
The steel structure 20 of the present embodiment is a box having a rectangular cross section, such as a viaduct of a bridge as shown in FIG. When the steel structure 20 has such a form, a first opening 22 for inserting the anode material 10 is formed in the top plate portion. Similarly to the above-described embodiment, a second opening 24 for inserting and fixing the conductive member 16 is formed in the lower half of the side wall of the box. If the top plate can be removed, the first opening 22 may be configured by removing the top plate. Here, as shown in FIG. 5, when the cross-sectional shape has a different aspect ratio and a so-called wide structure, a plurality of anode members 10 are arranged for one steel structure 20 as shown in FIG. For this reason, the first opening 22 can be one opening having a large area, but a plurality of second openings 24 are provided corresponding to the number of anode materials 10 to be arranged.

陽極材１０は、上記形態と同様に、第１開口部２２から挿入し、導電性部材１６を介して第２開口部２４を封止するようにして鋼構造物２０に固定する。ここで、図５、図６に示すように、保水性繊維１４における鋼構造物２０との接触面が平坦面となるように、保水性繊維１４を押圧変形させればよい。また、陽極材１０を複数配置する場合、その配置間隔は、近接配置される陽極材１０との隙間（保水性繊維間１４の隙間）が小さくなるように（理想としては隙間が無くなるように）すると良い。   The anode material 10 is inserted from the first opening 22 and fixed to the steel structure 20 so as to seal the second opening 24 via the conductive member 16 in the same manner as in the above embodiment. Here, as shown in FIGS. 5 and 6, the water-retaining fiber 14 may be pressed and deformed so that the contact surface of the water-retaining fiber 14 with the steel structure 20 becomes a flat surface. When a plurality of anode materials 10 are arranged, the arrangement interval is set such that a gap between adjacent anode materials 10 (a gap between the water-retaining fibers 14) is reduced (ideally, there is no gap). Good.

陽極材１０の配置間隔は、鋼構造物２０の設置場所や使用条件に応じて、適宜配置間隔を調整することが望ましい。なお、保水性繊維１４は、上記形態と同様に、金属棒１２の軸方向における配置範囲を覆う範囲で配置すれば良い。なお、陽極材１０の挿入、配置が終了した後には、上記実施形態と同様に、第１開口部２２を封止する。本形態の場合、天板を元に戻せば良い。   It is desirable that the arrangement interval of the anode material 10 is appropriately adjusted according to the installation location of the steel structure 20 and the use conditions. The water-retaining fibers 14 may be arranged in a range that covers the arrangement range of the metal rod 12 in the axial direction, as in the above embodiment. After the insertion and the placement of the anode material 10 are completed, the first opening 22 is sealed as in the above embodiment. In the case of this embodiment, the top plate may be returned to the original position.

このような工法とすることによれば、鋼構造物２０が、高架橋の高欄のような大型構造物であっても、防食対策による高欄自体の重量増加割合を抑制することができる。また、金属棒１２と保水性繊維１４といった簡易な構造、材料により陽極材１０を構成しているため、安価であり、かつ取扱い性も良好とすることができる。   According to such a construction method, even if the steel structure 20 is a large-sized structure such as a high-rail bridge, a weight increase rate of the rail itself due to anticorrosion measures can be suppressed. In addition, since the anode material 10 is made of a simple structure and material such as the metal rod 12 and the water-retaining fiber 14, it is inexpensive and has good handleability.

なお、上記実施形態のように、鋼構造物２０に対して保水性繊維１４を備えた陽極材１０を配置する場合、陽極材１０を配置する前に、鋼構造物２０の内部に素地調整を施すと良い。素地調整としては、鋼構造物２０の内部に付着した錆や汚れを落とす作業であれば良く、２種ケレン程度でも防食上問題はない。鋼構造物２０の内部に素地調整を施すことによれば、防食効果を高めることができる。   In the case where the anode material 10 including the water-retaining fibers 14 is disposed on the steel structure 20 as in the above-described embodiment, before the anode material 10 is disposed, the base is adjusted inside the steel structure 20. Good to apply. The base adjustment may be any operation as long as it removes rust and dirt attached to the inside of the steel structure 20, and there is no problem in anticorrosion even with about two kinds of keren. By performing the base adjustment inside the steel structure 20, the anticorrosion effect can be enhanced.

１０………陽極材、１２………金属棒、１２ａ………棘、１４………保水性繊維、１６………導電性部材、１８………ナット、２０………鋼構造物、２２………第１開口部、２４………第２開口部。 10 Anode material, 12 Metal rod, 12a Barb, 14 Water-retaining fiber, 16 Conductive member, 18 Nut, 20 Steel structure, 22... First opening, 24... Second opening.

Claims (2)

鋼構造物の上部に第１開口部を設けると共に、側部に前記第１開口部よりも小さな第２開口部を設け、
前記鋼構造物よりも卑な電位を有する金属棒の外周に保水性繊維を配置した陽極材を前記第１開口部から前記鋼構造物の内部に配置すると共に、前記第２開口部を介して前記金属棒と前記鋼構造物との導通を図った状態で固定することで前記第２開口部を封止することを特徴とする鋼構造物の防食工法。 A first opening is provided at the top of the steel structure, and a second opening smaller than the first opening is provided at a side portion,
An anode material in which water-retaining fibers are arranged on the outer periphery of a metal rod having a lower potential than the steel structure is arranged inside the steel structure from the first opening through the second opening. The corrosion prevention method for a steel structure, wherein the second opening is sealed by fixing the metal rod and the steel structure in a state where electrical conduction is achieved. 前記金属棒の外周には、前記保水性繊維に突き刺さる棘が備えられていることを特徴とする請求項１に記載の鋼構造物の防食工法。   The method for preventing corrosion of a steel structure according to claim 1, wherein the outer periphery of the metal rod is provided with thorns that pierce the water retention fiber.
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JPH0813528A (en) * 1994-06-23 1996-01-16 Nippon Light Metal Co Ltd Anticorrosion method of metal column concrete buried part
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