JP6713440B2 - Repainting method for steel members - Google Patents
Repainting method for steel members Download PDFInfo
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- JP6713440B2 JP6713440B2 JP2017174262A JP2017174262A JP6713440B2 JP 6713440 B2 JP6713440 B2 JP 6713440B2 JP 2017174262 A JP2017174262 A JP 2017174262A JP 2017174262 A JP2017174262 A JP 2017174262A JP 6713440 B2 JP6713440 B2 JP 6713440B2
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- repainting
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- 229910000831 Steel Inorganic materials 0.000 title claims description 129
- 239000010959 steel Substances 0.000 title claims description 129
- 238000000034 method Methods 0.000 title claims description 68
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 174
- 230000003449 preventive effect Effects 0.000 claims description 161
- 239000010410 layer Substances 0.000 claims description 146
- 238000010438 heat treatment Methods 0.000 claims description 114
- 238000000576 coating method Methods 0.000 claims description 94
- 239000011248 coating agent Substances 0.000 claims description 86
- 239000011247 coating layer Substances 0.000 claims description 78
- 230000006698 induction Effects 0.000 claims description 72
- 239000003973 paint Substances 0.000 claims description 64
- 239000000463 material Substances 0.000 claims description 51
- 238000005520 cutting process Methods 0.000 claims description 42
- 239000011701 zinc Substances 0.000 claims description 29
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 28
- 229910052725 zinc Inorganic materials 0.000 claims description 28
- 238000005422 blasting Methods 0.000 claims description 22
- 239000007787 solid Substances 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 9
- 238000005260 corrosion Methods 0.000 claims description 4
- 230000036961 partial effect Effects 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 11
- 229920005989 resin Polymers 0.000 description 10
- 239000011347 resin Substances 0.000 description 10
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 8
- 239000002826 coolant Substances 0.000 description 7
- 239000003822 epoxy resin Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 7
- 229920000647 polyepoxide Polymers 0.000 description 7
- 230000002265 prevention Effects 0.000 description 7
- 230000009931 harmful effect Effects 0.000 description 6
- 239000003595 mist Substances 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 239000003507 refrigerant Substances 0.000 description 6
- 239000002344 surface layer Substances 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 4
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 4
- 229920005749 polyurethane resin Polymers 0.000 description 4
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 4
- 235000017557 sodium bicarbonate Nutrition 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- -1 fluororesin Polymers 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
Description
本発明は、鋼部材の表面に塗布されている既存の塗膜を剥離して、再度塗装を行う塗装塗り替え工法に関する。本発明において鋼部材とは、橋梁、高架道路、送電鉄塔や電波塔などの建築物といった鋼構造物、それら鋼構造物に使用されている又は使用される鋼製品、鋼部品をはじめとして、各種分野における各種鋼材をいう。 The present invention relates to a paint repainting method in which an existing coating film applied to the surface of a steel member is peeled off and coating is performed again. In the present invention, steel members, steel structures such as bridges, elevated roads, buildings such as power transmission towers and radio towers, steel products used or used in these steel structures, various steel parts, Various steel materials in the field.
橋梁の主桁や補鋼材等に利用される鋼部材の表面には塗装が施されている。橋梁等に採用される塗装系は、錆止めに鉛丹や鉛系錆止め塗装を用いるＡ系塗装及びＢ系塗装と、錆止めに無機ジンクリッチペイント（以下、「無機ジンク」という）を用いるＣ系塗装に大別される。従来は多くの鋼橋の塗装系としてＡ系塗装及びＢ系塗装が採用されていたが、現在ではほとんどの鋼橋の塗装系としてＣ系塗装が採用されている。こうしたＡ系塗装やＢ系塗装、Ｃ系塗装といった呼称は、公益社団法人日本道路協会による「鋼道路橋防食便覧」と呼ばれる規準に記載されている。 The surface of steel members used for main girders of bridges and supplementary steel materials is painted. The coating systems used for bridges are A-based coatings and B-based coatings that use lead tin or lead-based rust-preventive coatings for rust prevention, and C-based coatings that use inorganic zinc-rich paint (hereinafter referred to as "inorganic zinc") for rust prevention. It is roughly divided into. Conventionally, A-based coating and B-based coating were used as the coating system for many steel bridges, but nowadays C-based coating is used as the coating system for most steel bridges. The designations such as A-based coating, B-based coating, and C-based coating are described in the standard called "Kodo Road Bridge Anticorrosion Handbook" by the Japan Road Association.
Ｃ系塗装では、図７（ａ）に示すように、ブラストされた鋼部材Ｘの表面に錆止め用の無機ジンクが塗布され、その外側（上）から霧状のミストコートが噴霧されて無機ジンク中の空気孔が埋められて錆止め層１が形成されている。ミストコートの外側には、エポキシ樹脂やフッ素樹脂、ポリウレタン樹脂等による外塗り層（塗膜）２が形成されている。 In the C-based coating, as shown in FIG. 7( a ), an inorganic zinc for rust prevention is applied to the surface of the blasted steel member X, and a mist-like mist coat is sprayed from the outside (top) of the inorganic zinc. The air holes inside are filled up to form the rust preventive layer 1. An outer coating layer (coating film) 2 made of epoxy resin, fluororesin, polyurethane resin or the like is formed on the outer side of the mist coat.
他方、Ａ系塗装及びＢ系塗装では、図７（ｂ）に示すように、ブラストされた鋼部材Ｘの表面にエッチングプライマーが塗布され、そのエッチングプライマーの外側（上）に鉛丹あるいは鉛系錆止めペイントが塗布されて錆止め層１が形成されている。鉛丹あるいは鉛系錆止めペイントの外側には、フタル酸樹脂塗料等の樹脂塗料が塗布されて外塗り層２が形成されている。 On the other hand, in the A-based coating and the B-based coating, as shown in FIG. 7(b), an etching primer is applied to the surface of the blasted steel member X, and a lead or lead-based material is applied outside (above) the etching primer. The rust preventive paint is applied to form the rust preventive layer 1. An outer coating layer 2 is formed by coating a resin coating such as a phthalic acid resin coating on the outside of the red lead or lead-based rust preventive coating.
ところで、鋼構造物の塗装は風雨や紫外線等の様々な要因によって腐食や劣化が生じるため、定期的に塗り替えを行う必要がある。また、Ａ系塗装やＢ系塗装のように、防錆材料として鉛丹が用いられている場合、鋼部材表面のすべての塗装を除去することが防錆面で好ましいが、Ｃ系塗装の場合、錆止め層の無機ジンクが犠牲防食作用を発揮するため、健全である限り、錆止め層を残したまま塗り替えを行うのが好ましいと考えられている。 By the way, the coating of a steel structure is subject to corrosion and deterioration due to various factors such as wind and rain, ultraviolet rays, etc. Therefore, it is necessary to repaint it periodically. In addition, when red lead is used as a rust preventive material such as A-based coating and B-based coating, it is preferable to remove all coatings on the surface of the steel member in terms of rust prevention, but in the case of C-based coating Since the inorganic zinc in the rust preventive layer exerts a sacrificial anticorrosive action, it is considered preferable to repaint the rust preventive layer with the rust preventive layer left as long as it is sound.
すべての塗装を除去する場合は、そのまま放置すると塗装を剥離した露出面に新たな錆が発生するため、四時間以内に露出した鋼部材に防錆加工を施さなければならず、作業工程の増加、作業コスト及び材料コストの増加等の観点から、Ｃ系塗装のように防錆効果が高く錆止め層が有害でなく、すべての塗装を除去する必要がない場合には、可能な限り塗装は残しておくのが望ましい。 If all coatings are removed, if they are left as they are, new rust will be generated on the exposed surface from which the coating has been peeled off.Therefore, the exposed steel members must be rust-proofed within 4 hours, increasing the number of work processes. From the viewpoints of increase in work cost and material cost, if the rust preventive layer is not harmful and the rust preventive layer is not harmful like C-based coating and it is not necessary to remove all coatings, leave the coating as much as possible. It is desirable to keep it.
従来、鋼構造物表面の塗装を剥離する工法として、グラインダーやサンダー、カップブラシ等の機械器具を用いて表面を削り取る工法（特許文献１）や、剥離剤を塗布する化学的な工法（特許文献２）、電磁誘導加熱による誘導加熱で剥離する工法（特許文献３及び４）、サンドブラスト等で塗装を削り取る方法等が提案されている。 Conventionally, as a method of peeling off the coating on the surface of a steel structure, a method of scraping off the surface using a machine tool such as a grinder, a sander, or a cup brush (Patent Document 1), or a chemical method of applying a release agent (Patent Document 2), a method of peeling by induction heating by electromagnetic induction heating (Patent Documents 3 and 4), a method of scraping off the coating by sandblasting, etc. have been proposed.
Ｃ系塗装が採用されている場合、錆止め層を残すのが好ましいが、前記機械器具を用いて表面を切削する工法では、錆止め層だけを残して塗装を切削するのは困難であり、切削片や切削粉の飛散防止のための設備に時間やコストがかかるほか、切削粉等の飛散による作業環境の悪化や騒音等、様々な問題が生じる。剥離剤を塗布して塗装を剥離する化学的な処理工法では、気温が２０℃以上にならないと化学反応が活性化しなかったり、また活性化するまでに長時間を要するため、作業スケジュールを組めない等の弊害がある。また、従来の高周波誘導加熱装置はウィンチで吊り上げなければならないほど重いため、使い勝手が悪いという難点がある。ブラストによる工法では、切削粉の飛散防止設備が必要である、設備が大掛かりになる、作業員に高度な粉塵対策が要求される、供給環境では、作業足場を密閉するために大きな風荷重が作用する等の難点がある。 When the C-based coating is adopted, it is preferable to leave the rust preventive layer, but it is difficult to cut the paint by leaving only the rust preventive layer in the method of cutting the surface by using the above-mentioned machine tool. In addition to the time and cost required for equipment for preventing the scattering of cutting powder and cutting powder, various problems such as deterioration of working environment and noise due to scattering of cutting powder occur. In the chemical treatment method of applying a release agent to remove the coating, the work schedule cannot be set because the chemical reaction does not activate unless the temperature rises above 20°C, or it takes a long time to activate. There are harmful effects such as. In addition, the conventional high-frequency induction heating device is heavy enough to be hoisted by a winch, and thus has a drawback of being inconvenient to use. The blasting method requires equipment to prevent the scattering of cutting powder, the equipment becomes large, and workers are required to take advanced dust countermeasures.In the supply environment, a large wind load acts to seal the work scaffold. There are difficulties such as doing.
Ａ系塗装やＢ系塗装が採用されている場合、剥離される錆止め層と外塗り層はともに産業廃棄物として扱われるが、両者は、例えばＰＣＢ（ポリ塩化ビフェニル）を含有する塗料が外塗り層に含まれているとその処理方法を変えて対処する必要が生じるため、廃棄処分に際しては両者を明確に分離して廃棄するのが好ましい。この点、前記機械器具では両者を分離して切削することは困難であり、化学的処理方法や誘導加熱による方法、ブラストによる方法では、前記弊害がある。 When A-based coating or B-based coating is adopted, both the rust preventive layer and the outer coating layer that are peeled off are treated as industrial waste, but both are coated with a coating containing PCB (polychlorinated biphenyl), for example. When it is contained in the layer, it is necessary to deal with it by changing its treatment method. Therefore, it is preferable to clearly separate the two before disposal. In this respect, it is difficult for the machine tool to separate and cut the two, and the chemical treatment method, the method by induction heating, and the method by blast have the above-mentioned adverse effects.
本発明の解決課題は、鋼部材の塗装の塗り替えに際して、錆止め層を残して外塗り層だけを剥離し、残した錆止め層の上に新たな塗料（新塗料）を塗り替える鋼部材の塗装塗り替え工法を提供することにある。また、残した錆止め層の厚さ方向の一部（表層側）を切削除去して厚さ方向深層側（深層部）を残し、又は、残した錆止め層のすべて（表層側から深層部まで）を切削除去して鋼部材表面を露出させ、残された深層部又は露出した鋼部材露出面に新たな錆止め材（新錆止め材）を塗布し、その新錆止め材に新たな塗料（新塗料）を塗布する鋼部材の塗装塗り替え工法を提供することにある The problem to be solved by the present invention is to repaint a steel member by repainting a steel member by leaving a rust preventive layer, peeling off only the outer coat layer, and repainting a new paint (new paint) on the remaining rust preventive layer. To provide. Also, part of the remaining rust preventive layer in the thickness direction (surface layer side) is removed by cutting to leave the depth direction deep side (deep layer part), or all the remaining rust preventive layer (from the surface layer side to the deep layer part) To remove the steel member surface to expose the steel member surface, apply a new rust preventive material (new rust preventive material) to the remaining deep part or exposed steel member exposed surface, and add a new paint (new paint) to the new rust preventive material To provide a coating repainting method for steel members that apply
本発明の第一の塗装塗り替え工法は、鋼部材の表面に錆止め層、外塗り層（塗膜）を備えた鋼部材の塗装塗り替え工法であり、誘導加熱装置による誘導加熱によって鋼部材表面を加熱してその熱で塗膜を軟化させ、錆止め層を残して外塗り層をシート状態あるいは飛散せずに固まった状態で剥離し、鋼部材表面に残った既存の錆止め層の上に新たな塗料（新塗料）を塗ることで鋼部材の塗装を塗り替える工法である。 The first coating repainting method of the present invention is a coating repainting method of a steel member having a rust preventive layer and an outer coating layer (coating) on the surface of the steel member, and heating the steel member surface by induction heating by an induction heating device. Then, the heat softens the coating film and peels off the outer coating layer in a sheet state or in a solid state without scattering, leaving a rust preventive layer, and a new paint is applied on the existing rust preventive layer remaining on the surface of the steel member. This is a method of repainting the steel members by applying (new paint).
本発明の第二の塗装塗り替え工法は、第一の塗装塗り替え工法と同様に、誘導加熱装置による誘導加熱によって鋼部材表面を加熱してその熱で塗膜を軟化させ、錆止め層を残して外塗り層をシート状態で剥離し、鋼部材表面に残した錆止め層の厚さ方向の一部（表層側）を切削除去して錆止め層の厚さ方向の深層部を残し、又は、錆止め層の厚さ方向の表層側から深層部までのすべてを切削除去し、表層側を切削除去して残した残存錆止め層に、又はすべてを切削除去して露出させた鋼部材露出面に、防錆効果のある新防錆材料を塗布して新たな錆止め層（新錆止め層）を形成し、その新錆止め層に新たな塗料（新塗料）を塗って新上塗り層を形成する鋼部材の塗装塗り替る工法である。この場合、鋼（Ｆｅ）よりもイオン化傾向の大きな亜鉛（Ｚｎ）を主体とした新防錆材料を塗布して新防錆層を形成することで、新防錆材料とその上に塗布した新塗料との電気化学的作用による犠牲防食作用を得ることができる。 The second coating repainting method of the present invention, like the first coating repainting method, heats the surface of the steel member by induction heating with an induction heating device to soften the coating film by the heat, leaving the rust preventive layer outside. The coating layer is peeled off as a sheet, and a part (surface layer side) in the thickness direction of the rust preventive layer left on the surface of the steel member is removed by cutting to leave a deep portion in the thickness direction of the rust preventive layer, or Rust-preventive effect on the remaining rust-preventive layer left by cutting and removing the surface side from the surface side to the deep part in the thickness direction, or on the exposed surface of the steel member exposed by cutting and removing all A new rust preventive material is applied to form a new rust preventive layer (new rust preventive layer), and a new paint (new paint) is applied to the new rust preventive layer to form a new top coat layer. It is a construction method. In this case, by coating a new rust preventive material mainly composed of zinc (Zn), which has a greater ionization tendency than steel (Fe), to form a new rust preventive layer, the new rust preventive material and the new rust preventive material applied on the new rust preventive material are formed. It is possible to obtain a sacrificial anticorrosive action by an electrochemical action with the paint.
本発明の第一の塗装塗り替え工法は次の効果を奏する。
（１）鋼材表面に残した既存の錆止め層を再利用することができるため、施工スピードを大幅に短縮することができるとともに、塗り替えに要するコストを抑えることができる。
（２）外塗り層をシート状態あるいは飛散しないで固まった状態で剥離するため、有害物質を含む塗料が粉塵となって飛散することがなく、作業環境が悪化しない。
（３）鋼材表面の既存の錆止め層を残すため、産業廃棄物の量を削減することができる。
（４）誘導加熱装置を鋼部材に宛がうだけでよいため、作業者の経験や熟練による差が生じにくい。
（５）錆止め層と外塗り層を分離して剥離できるため、外塗り層にＰＣＢが含有されている塗膜も安全にしかも最低限の量で廃棄でき、ＰＣＢやダイオキシンの発生等、産業廃棄物処理による環境への悪影響を低減することができる。
The first paint repainting method of the present invention has the following effects.
(1) Since the existing rust preventive layer left on the surface of the steel material can be reused, the construction speed can be significantly reduced and the cost required for repainting can be suppressed.
(2) Since the outer coating layer is peeled off in a sheet state or in a solid state without scattering, the paint containing the harmful substance does not become dust and scatter, and the working environment does not deteriorate.
(3) Since the existing rust preventive layer on the surface of the steel material is left, the amount of industrial waste can be reduced.
(4) Since it suffices to apply the induction heating device to the steel member, a difference due to the experience and skill of the operator hardly occurs.
(5) Since the rust preventive layer and the external coating layer can be separated and peeled off, the coating film containing PCB in the external coating layer can be safely and minimally discarded, and industrial disposal such as generation of PCB and dioxin. It is possible to reduce adverse effects on the environment due to material processing.
本発明の第二の塗装塗り替え工法は次の効果を奏する。
（１）外塗り層をシート状態あるいは飛散しないで固まった状態で剥離するため、有害物質を含む塗料が粉塵となって飛散することがなく、作業環境が悪化しない。
（２）錆止め層と外塗り層を分離して剥離できるため、外塗り層にＰＣＢが含有されている塗膜も安全にしかも最低限の量で廃棄でき、ＰＣＢやダイオキシンの発生等、産業廃棄物処理による環境への悪影響を低減することができる。
（３）誘導加熱装置を鋼部材に宛がうだけでよいため、作業者の経験や熟練による差が生じにくい。
（４）新錆止め材にイオン化傾向の大きな亜鉛を含有する新防錆材料を塗ることで、その新防錆材料とその上の新塗料との接触による電気化学的な犠牲防食作用で鋼部材の防錆効果が得られる。
The second paint repainting method of the present invention has the following effects.
(1) Since the outer coating layer is peeled off in a sheet state or in a solid state without scattering, the paint containing harmful substances does not become dust and scatter, and the working environment does not deteriorate.
(2) Since the rust preventive layer and the outer coating layer can be separated and peeled off, the coating film containing PCB in the outer coating layer can be safely and minimally discarded, and industrial disposal such as generation of PCB and dioxin. It is possible to reduce adverse effects on the environment due to material processing.
(3) Since it suffices to apply the induction heating device to the steel member, a difference due to the experience and skill of the operator hardly occurs.
(4) By coating a new rust preventive material containing zinc, which has a large ionization tendency, on the new rust preventive material, an electrochemical sacrificial anticorrosive action due to the contact between the new rust preventive material and the new paint on the steel member causes Anti-corrosion effect can be obtained.
（実施形態１）
本発明の第一の塗装塗り替え工法（以下「塗り替え工法」という）を、図面を参照して説明する。この実施形態の塗り替え工法は、図１に示すように、鋼部材Ｘの外側に宛がった誘導加熱装置１０の誘導加熱で鋼部材Ｘの表面を加熱して当該鋼部材Ｘ表面の塗装のうち錆止め層１の外側の外塗り層２を軟化させる軟化工程Ｓ１と、軟化した外塗り層２を剥離手段によって錆止め層１からシート状の塊として（シート状態で）剥離する剥離工程Ｓ２と、外塗り層２の剥離によって露出した錆止め層１に新たな塗料を塗って鋼部材Ｘの塗装を塗り替える塗り替え工程Ｓ３を備えたものである。本発明では誘導加熱装置に高周波誘導加熱装置（induction heating：ＩＨ）が適するが、可能であれば低周波誘導加熱装置を使用することもできる。以下では高周波誘導加熱装置を使用する場合を一例として説明する。本発明の波誘導加熱装置における冷却部は水冷式、空冷式、その他いずれの冷却方式でもよいが、以下では水冷式の場合を一例として説明する。本願の鋼部材Ｘには例えば橋梁の主桁等が含まれる。説明の便宜上、それぞれの工程の説明に先立ち、この実施形態の塗装系の概要について説明を行う。
(Embodiment 1)
The first paint repainting method (hereinafter referred to as "repainting method") of the present invention will be described with reference to the drawings. In the repainting method of this embodiment, as shown in FIG. 1, the surface of the steel member X is heated by the induction heating of the induction heating device 10 which is located outside the steel member X to coat the surface of the steel member X. A softening step S1 of softening the outer coating layer 2 outside the rust preventive layer 1, and a peeling step S2 of peeling the softened outer coating layer 2 from the rust preventive layer 1 as a sheet-like mass (in a sheet state) by a peeling means, The rust preventive layer 1 exposed by peeling of the outer coating layer 2 is provided with a repainting step S3 in which a new paint is applied to repaint the steel member X. In the present invention, a high frequency induction heating device (IH) is suitable for the induction heating device, but a low frequency induction heating device may be used if possible. The case where a high frequency induction heating device is used will be described below as an example. The cooling unit in the wave induction heating device of the present invention may be any of a water cooling type, an air cooling type, and any other cooling system, but a water cooling type will be described below as an example. The steel member X of the present application includes, for example, a main girder of a bridge. For convenience of description, an outline of the coating system of this embodiment will be described prior to description of each step.
［塗装系］
この実施形態の塗装系は、防錆材料として無機ジンクが用いられたＣ系塗装である。この塗装系は、図７（ａ）に示すように、ブラストされた鋼部材Ｘの表面（ブラスト面）に防錆材料として無機ジンク（無機ジンクリッチプライマーや無機ジンクリッチペイント等）が塗布され、その外側から霧状のミストコートが噴霧されて無機ジンク中の空気孔が埋められ、錆止め層１が形成されている。ミストコートの外側には、エポキシ樹脂が中塗りされ、そのエポキシ樹脂の外側にフッ素系樹脂やポリウレタン系樹脂が上塗りされて外塗り層２が形成されている。前記外塗り層２は一例であり、外塗り層２の構造はこれ以外であってもよい。
[Painting]
The coating system of this embodiment is a C-based coating in which inorganic zinc is used as a rust preventive material. In this coating system, as shown in FIG. 7(a), inorganic zinc (inorganic zinc rich primer, inorganic zinc rich paint, etc.) is applied as a rust preventive material to the surface (blast surface) of the blasted steel member X, A mist-like mist coat is sprayed from the outside to fill the air holes in the inorganic zinc, and the rust preventive layer 1 is formed. An epoxy resin is intermediately coated on the outside of the mist coat, and a fluorine resin or a polyurethane resin is overcoated on the outside of the epoxy resin to form the outer coating layer 2. The outer coating layer 2 is an example, and the structure of the outer coating layer 2 may be other than this.
［軟化工程］
前記軟化工程Ｓ１は、高周波誘導加熱装置（以下「誘導加熱装置」という）１０の誘導加熱で鋼部材Ｘの表面を加熱して当該鋼部材Ｘ表面の塗装のうち錆止め層１の外側の外塗り層２を軟化させる工程である。この工程を経ることによって外塗り層２が錆止め層１から分離される（浮き上がる）。鋼部材Ｘの外側に誘導加熱装置１０を宛がい、当該誘導加熱装置１０に交流電源を供給して、誘導加熱により鋼部材Ｘの表面を加熱する。この状態を維持しながら、誘導加熱装置１０を鋼部材Ｘに沿って移動させる。誘導加熱装置１０の移動スピードは、加熱対象箇所に１〜２秒程度滞在するスピードとするのが好ましい。塗装剥離の対象とする鋼材表面の加熱温度は１００℃以上２５０℃未満、特に、１５０℃〜２００℃程度が適する。加熱温度が２５０℃を超えると過加熱により、塗装から有害成分が発生するおそれがあり、１００℃未満だと加熱不足により塗装の分離が不完全になるおそれがある。ただし、これらの数値は一例であり、塗装の種類や雰囲気温度、湿度、天気等の各種状況に応じて、最適な条件を選択すればよい。誘導加熱装置１０は、既存のものを用いることができる。
[Softening process]
In the softening step S1, the surface of the steel member X is heated by induction heating of a high-frequency induction heating device (hereinafter referred to as “induction heating device”) 10 to coat the surface of the steel member X with an outer coating outside the rust preventive layer 1. This is a step of softening the layer 2. Through this step, the outer coating layer 2 is separated (lifted) from the rust preventive layer 1. The induction heating device 10 is placed on the outside of the steel member X, an AC power is supplied to the induction heating device 10, and the surface of the steel member X is heated by induction heating. The induction heating device 10 is moved along the steel member X while maintaining this state. The moving speed of the induction heating device 10 is preferably such that the induction heating device 10 stays at the location to be heated for about 1 to 2 seconds. The heating temperature of the surface of the steel material that is the target of paint removal is 100° C. or higher and lower than 250° C., and particularly 150° C. to 200° C. is suitable. If the heating temperature exceeds 250°C, harmful components may be generated from the coating due to overheating, and if it is less than 100°C, the coating may be incompletely separated due to insufficient heating. However, these numerical values are only examples, and the optimum conditions may be selected according to various situations such as the type of coating, atmospheric temperature, humidity, and weather. As the induction heating device 10, an existing one can be used.
錆止め層１が鋼部材Ｘから分離せず、外塗り層２のみが錆止め層１から分離する理由は、（１）鋼部材Xと錆止め層１は金属系ということもあり樹脂系である外塗り層２の材料に比べ線膨張係数が低く伸びにくいのに対して、外塗り層２の線膨張係数が高く伸びやすいこと、（２）加熱によって外塗り層２の塗装が伸びて劣化すること、（３）鋼部材Ｘ表面がブラストされているため、図８に示すように、鋼部材Ｘ表面が機械的に微細な凹凸が生じ、そこに防錆材料（無機ジンクや後述する鉛丹。以下同じ。）も微細に凸凹状に密着すること（４）これら（１）、（２）、（３）の理由が複合されて生じること等が考えられる。 The reason why the rust preventive layer 1 is not separated from the steel member X and only the outer coating layer 2 is separated from the rust preventive layer 1 is that (1) the steel member X and the rust preventive layer 1 are metal-based and resin-based outer coating The linear expansion coefficient is low and difficult to expand compared with the material of the layer 2, while the linear expansion coefficient of the external coating layer 2 is high and easy to expand, (2) the coating of the external coating layer 2 is expanded and deteriorated by heating, (3) Since the surface of the steel member X is blasted, as shown in FIG. 8, mechanically fine irregularities are formed on the surface of the steel member X, and rust-preventive materials (inorganic zinc and lead tin which will be described later. It is considered that the same) also adheres finely unevenly (4) These reasons (1), (2), and (3) are combined to occur.
前記（１）の線膨張係数の差について説明すると、例えば、鉄（鋼部材）と無機ジンクの線膨張係数は１２０×１０−５程度、樹脂（外塗り層）の線膨張係数は８００×１０−５程度であり、両者の線膨張係数は大きく異なる。このため、無機ジンクと樹脂（外塗り層）の界面に差が生じ、鋼部材Ｘの表面を誘導加熱装置１０で加熱すると、錆止め層１が鋼部材Ｘから分離することなく、外塗り層２のみが錆止め層１から分離すると考えられる。 Explaining the difference in the linear expansion coefficient of the above (1), for example, the linear expansion coefficient of iron (steel member) and inorganic zinc is about 120×10 −5 , and the linear expansion coefficient of the resin (outer coating layer) is 800×10. It is about -5 , and the linear expansion coefficients of both are significantly different. Therefore, a difference occurs in the interface between the inorganic zinc and the resin (outer coating layer), and when the surface of the steel member X is heated by the induction heating device 10, the rust preventive layer 1 does not separate from the steel member X and the outer coating layer 2 It is believed that only the rust preventive layer 1 separates.
前記（２）の加熱による外塗り層２の劣化という点について説明すると、誘導加熱装置１０によって鋼部材Ｘが加熱され、その表面側の外塗り層２が加熱されると、塗装が軟化して劣化が生じる。これに対し、誘導加熱装置１０での加熱温度は鋼部材Ｘの耐熱温度以下であり、鋼部材Ｘや亜鉛を主成分とする無機ジンクの劣化は生じない。この結果、無機ジンクは鋼部材Ｘに固着したまま分離せず、劣化が生じた外側の外塗り層２のみが錆止め層１から分離すると考えられる。 Explaining the deterioration of the outer coating layer 2 due to the heating of (2), the induction heating device 10 heats the steel member X, and when the outer coating layer 2 on the surface side is heated, the coating softens. Deterioration occurs. On the other hand, the heating temperature in the induction heating device 10 is equal to or lower than the heat resistant temperature of the steel member X, and the steel member X and the inorganic zinc containing zinc as a main component are not deteriorated. As a result, it is considered that the inorganic zinc does not separate while being fixed to the steel member X, and only the outer coating layer 2 on the outer side where deterioration has occurred separates from the rust preventive layer 1.
前記（３）の鋼部材Ｘと防錆材料の密着性について説明すると、鋼部材Ｘの表面はブラストされて図７（ａ）（ｂ）及び図８のように粗面化されている（凹凸が存在している）ため、平滑な表面に塗布する場合に比べて、防錆材料が機械的に密着しやすくなると考えられる。 Explaining the adhesion between the steel member X and the rust preventive material in (3) above, the surface of the steel member X is blasted and roughened as shown in FIGS. Therefore, it is considered that the rust preventive material is mechanically adhered more easily than when it is applied to a smooth surface.
［剥離工程］
前記剥離工程Ｓ２は、前記軟化工程により軟化した外塗り層２を、既存のカワスキやスクレーパ等で錆止め層１から剥離する工程である。外塗り層２は前記軟化工程Ｓ１で軟化して錆止め層１から分離した状態であり、カワスキ等によってシート状態やあるいは飛散しないで固まった状態で剥離することができる。ただし、剥離後の錆止め層１の表面には若干の塗装が残るため、残った塗装はカワスキ等で掻きとるのが望ましい。剥離した又は掻き取った外塗り層の塗料は回収する（外塗り層回収工程：図１のＳ２ａ）。
[Peeling process]
The peeling step S2 is a step of peeling the outer coating layer 2 softened by the softening step from the rust preventive layer 1 with an existing Kawasuki, scraper or the like. The outer coating layer 2 is in a state of being softened in the softening step S1 and separated from the rust-preventing layer 1, and can be peeled off in a sheet state or a solid state without scattering due to rustiness or the like. However, since a small amount of coating remains on the surface of the rust preventive layer 1 after peeling, it is desirable to scrape off the remaining coating with a scratch or the like. The paint of the outer coating layer that has been peeled off or scraped off is collected (external coating layer collecting step: S2a in FIG. 1).
［塗り替え工程］
前記塗り替え工程Ｓ３は、剥離工程Ｓ２での外塗り層２の剥離によって露出した錆止め層１の外側に、新たな塗料を塗って鋼部材Ｘの塗装を塗り替える工程である。この実施形態では、エポキシ樹脂を中塗りした後、そのエポキシ樹脂の外側にフッ素系樹脂又はポリウレタン系樹脂を上塗りする場合を一例としているが、外塗り層２はこれ以外の塗料で構成することもできる。錆止め層１に塗布する塗料は、剥離した塗装と同じものでも異なるものでもよい。塗料の塗布に際しては、下塗り、中塗り、上塗りを必要に応じて行うことができる。塗料の塗布量や塗布厚等は、既存の場合と同様とすることができる。また、新たな塗料を塗布する前に、露出した錆止め層１を洗浄するようにしてもよい。補足的に防錆材料を重ね塗りすることもできる。防錆材料を重ね塗りすることによって、防錆材料が剥離されて露出しているような場合でも、鋼部材Ｘの表面からの発錆を防止することができる。新たな塗料の付着を高めるためには、外塗り層を剥離して残した錆止め層１を、研削材に重曹を用いた重曹ブラスト、バキュームブラスト、レーザーブラスト等の各種ブラスト工法により再ブラストすることもできる（図１に仮想線で示すＳ２ｂ工程）。この再ブラストは錆止め層１の厚さ方向表層側が多少粗面化される程度の強さのブラストが望ましく、錆止め層１の厚さ方向のすべてが剥離する（損傷する）様な過度のブラストは避けるのが望ましい。
[Repainting process]
The repainting step S3 is a step of repainting the steel member X by applying new paint to the outside of the rust preventive layer 1 exposed by the peeling of the outer coating layer 2 in the peeling step S2. In this embodiment, the case where the epoxy resin is internally coated and then the fluororesin or the polyurethane resin is overcoated on the outer side of the epoxy resin is described as an example, but the outer coating layer 2 may be made of a coating material other than this. it can. The paint applied to the rust preventive layer 1 may be the same as or different from the peeled paint. When applying the paint, an undercoat, an intermediate coat, and an overcoat can be applied as necessary. The coating amount and coating thickness of the paint can be the same as in the existing case. Further, the exposed rust preventive layer 1 may be washed before applying new paint. It is also possible to supplementarily coat a rust preventive material. Overcoating with the rust preventive material can prevent rusting from the surface of the steel member X even when the rust preventive material is peeled off and exposed. In order to enhance the adhesion of new paint, the rust preventive layer 1 left after peeling off the outer coating layer should be reblasted by various blasting methods such as baking soda blasting using baking soda, vacuum blasting, laser blasting, etc. It is also possible (step S2b shown in phantom in FIG. 1). This re-blasting is preferably a blast having a strength such that the surface layer side in the thickness direction of the rust preventive layer 1 is roughened to some extent, and an excessive blast that peels off (damages) all in the thickness direction of the rust preventive layer 1. It is desirable to avoid it.
（実施形態２）
本発明の第二の塗り替え工法を、図面を参照して説明する。この実施形態の塗り替え工法は、図２に示すように、鋼部材Ｘの外側に宛がった誘導加熱装置１０の誘導加熱で鋼部材Ｘの表面を加熱して当該鋼部材Ｘ表面の塗装のうち錆止め層１の外側の外塗り層２を軟化させる軟化工程Ｓ１１と、軟化させた外塗り層２を剥離手段によって錆止め層１からシート状態やあるいは飛散しないで固まった状態で剥離する剥離工程Ｓ１２と、外塗り層２の剥離によって露出した錆止め層１を切削する切削工程Ｓ１３と、外塗り層２を剥離して残した錆止め層１を切削除去して露出させた鋼部材Ｘの表面（鋼部材露出面）に新防錆材料を塗布して新錆止め層を形成する錆止め層形成工程Ｓ１４と、新錆止め層の外側に新たな塗料を塗って鋼部材Ｘの塗装を塗り替える塗り替え工程Ｓ１５を備えたものである。説明の便宜上、それぞれの工程の説明に先立ち、この実施形態の塗装系の概要について説明を行う。
(Embodiment 2)
The second repainting method of the present invention will be described with reference to the drawings. In the repainting method of this embodiment, as shown in FIG. 2, the surface of the steel member X is heated by the induction heating of the induction heating device 10 that is directed to the outside of the steel member X to coat the surface of the steel member X. Of these, a softening step S11 for softening the outer coating layer 2 outside the rust preventive layer 1 and a peeling step S12 for peeling the softened outer coating layer 2 from the rust preventive layer 1 by a peeling means in a sheet state or in a solid state without scattering. And a cutting step S13 for cutting the rust preventive layer 1 exposed by peeling of the outer coating layer 2, and the surface of the steel member X exposed by cutting and removing the rust preventive layer 1 left after peeling the outer coating layer 2 (steel). A rust preventive layer forming step S14 of forming a new rust preventive layer by applying a new rust preventive material to the exposed surface of the member) and a repainting step S15 of applying a new paint to the outside of the new rust preventive layer to repaint the steel member X. It is a thing. For convenience of description, an outline of the coating system of this embodiment will be described prior to description of each step.
［塗装系］
この実施形態の塗装系は防錆材料として鉛丹あるいは鉛系錆止めペイントが用いられたＡ系塗装である。この塗装系は、図７（ｂ）に示すように、ブラストされた鋼部材Ｘの表面にエッチングプライマーが塗布され、そのエッチングプライマーの外側に鉛丹あるいは鉛系錆止めペイントが塗布されて錆止め層１が形成されている。鉛丹の外側には、フタル酸樹脂塗料等の樹脂塗料が塗布されて外塗り層２が形成されている。前記外塗り層２は一例であり、外塗り層２の構造はこれ以外であってもよい。
[Painting]
The coating system of this embodiment is an A-based coating that uses lead tin or a lead-based rust preventive paint as a rust preventive material. In this coating system, as shown in FIG. 7B, an etching primer is applied to the surface of the blasted steel member X, and a red lead or lead-based rust preventive paint is applied to the outside of the etching primer to prevent the rust preventive layer 1. Are formed. The outer coating layer 2 is formed by coating a resin coating such as a phthalic acid resin coating on the outside of the lead tin. The outer coating layer 2 is an example, and the structure of the outer coating layer 2 may be other than this.
［軟化工程］
前記軟化工程Ｓ１１は、鋼部材Ｘの外側に宛がった誘導加熱装置１０の誘導加熱で鋼部材Ｘを加熱して当該鋼部材Ｘ表面の塗装のうち錆止め層１の外側の外塗り層２を軟化させる工程である。この工程を経ることによって外塗り層２が錆止め層１から分離される（浮き上がる）。錆止め層１が鋼部材Ｘから分離せず、外塗り層２のみが錆止め層１から分離する理由は、前記実施形態１における（１）〜（３）と同様である。
[Softening process]
In the softening step S11, the steel member X is heated by induction heating of the induction heating device 10 directed to the outside of the steel member X to coat the surface of the steel member X with the outer coating layer 2 outside the rust preventive layer 1. Is a step of softening. Through this step, the outer coating layer 2 is separated (lifted) from the rust preventive layer 1. The reason why the rust preventive layer 1 is not separated from the steel member X and only the outer coating layer 2 is separated from the rust preventive layer 1 is the same as (1) to (3) in the first embodiment.
［剥離工程］
前記剥離工程Ｓ１２は、前記軟化工程Ｓ１１により軟化した外塗り層２を、既存のカワスキやスクレーパ等で錆止め層１から剥離する工程である。外塗り層２は前記軟化工程Ｓ１１で軟化して錆止め層１から分離した状態であり、カワスキ等によってシート状態で剥離することができる。剥離した外塗り層２にはＰＣＢが含まれていることもあるが、本発明の塗膜塗り替え工法によれば、外塗り層２をシート状態もしくは飛散しないで固まった状態で剥離することができるので、剥離片の回収が容易である。ただし、剥離後の錆止め層１の表面には若干の塗装が残るため、残った部分はカワスキ等で掻きとるのが望ましい。剥離した外塗り層２の塗料は回収する（図２の外塗り層回収工程（Ｓ１２ａ）。
[Peeling process]
The peeling step S12 is a step of peeling the outer coating layer 2 softened by the softening step S11 from the rust preventive layer 1 with an existing Kawaski or scraper. The outer coating layer 2 is in a state of being softened in the softening step S11 and separated from the rust-preventing layer 1, and can be peeled off in a sheet state by kawasuki or the like. The peeled outer coating layer 2 may contain PCB, but according to the coating film recoating method of the present invention, the outer coating layer 2 can be peeled in a sheet state or in a solid state without scattering. Therefore, the peeled pieces can be easily collected. However, since a small amount of coating remains on the surface of the rust preventive layer 1 after peeling, it is desirable to scrape off the remaining portion with a rake or the like. The paint of the peeled outer coating layer 2 is collected (the outer coating layer collecting step (S12a) in FIG. 2).
［切削工程］
前記切削工程Ｓ１３は、外塗り層２の剥離によって露出した錆止め層１を切削する工程である。この切削工程Ｓ１３では前記錆止め層１の厚さ方向表層側を切削除去（一部切削除去）して厚さ方向鋼部材側（深層側）を残すことも、厚さ方向のすべてを切削除去（全部切削除去）して鋼部材Ｘを露出させることもできる。錆止め層１の切削には、飛散防止のため切削機械器具に集塵機能付きのものを使用するのが望ましい。例えば、既存のグラインダーやサンダー、カップブラシ、バキュームブラストレーザーブラスト等の機械器具を用いることができる。一部切削除去の場合も全部切削除去の場合も、切削除去された錆止め層１の錆止め塗料は回収する（図２のＳ１３ａ）。一部切削除去の場合は残された深層側の錆止め層（残存錆止め層）を、全部切削除去の場合は露出した鋼部材露出面を、再ブラスト加工（図２のＳ１３ｂ）して粗面化することもできる。この再ブラスト加工も残存錆止め層の表層側が多少粗面化される程度の強さのブラストが望ましく、残存錆止め層の厚さ方向のすべてが剥離する（損傷する）様な過度のブラストは避けるのが望ましい。鋼部材露出面の再ブラスト加工もその表面が多少粗面化される程度の強さのブラストが望ましい。この再ブラストにもバキュームブラストやレーザーブラスト等を用いることができる。この再ブラストにバキュームブラストやレーザーブラストを用いた場合、前記切削工程（図２の切削工程Ｓ１３）と再ブラスト工程を同時に行うことができる。
[Cutting process]
The cutting step S13 is a step of cutting the rust preventive layer 1 exposed by peeling the outer coating layer 2. In this cutting step S13, the surface layer side in the thickness direction of the rust preventive layer 1 is removed by cutting (partial cutting removal) to leave the steel member side in the thickness direction (deep layer side), or the entire thickness direction is removed by cutting ( It is also possible to expose the steel member X by completely removing it by cutting. For cutting the rust preventive layer 1, it is desirable to use a cutting machine tool having a dust collecting function in order to prevent scattering. For example, existing machinery such as a grinder, a sander, a cup brush, and a vacuum blast laser blast can be used. The rust preventive paint of the rust preventive layer 1 which has been cut and removed is recovered in both cases of partial cutting and total cutting removal (S13a in FIG. 2). In the case of partial cutting removal, the remaining deep rust preventive layer (residual rust preventive layer) and in the case of complete cutting removal, the exposed steel member exposed surface is reblasted (S13b in FIG. 2) to roughen the surface. You can also do it. Also in this re-blasting process, a blast having a strength that the surface side of the residual rust preventive layer is roughened to some extent is desirable, and an excessive blast that peels off (damages) all in the thickness direction of the residual rust preventive layer is avoided. Is desirable. In the re-blasting of the exposed surface of the steel member, it is desirable that the blasting strength is such that the surface is roughened to some extent. A vacuum blast, a laser blast, etc. can also be used for this re-blast. When vacuum blasting or laser blasting is used for this reblasting, the cutting step (cutting step S13 in FIG. 2) and the reblasting step can be performed at the same time.
［錆止め層形成工程］
前記錆止め層形成工程Ｓ１４は、もとの錆止め層１のすべてを切削除去することによって露出した鋼部材露出面、又はもとの錆止め層１の表層部を切削除去して残した深層側の残存錆止め層の上に新たな防錆材料を塗布して新たな錆止め層を形成する工程である。錆止め層はこれ以外の方法で形成することもできる。この場合、防錆効果のある新たな錆止め材を塗布して新錆止め層を形成し、その新錆止め層に新たな塗料を塗って新外塗り層を形成する。新錆止め層は鋼（Ｆｅ）よりもイオン化傾向の大きな亜鉛、つまりＺｎを主体とした新防錆材料が適する。この新防錆材料を塗布して新錆止め層を形成することにより、新防錆材料とその上に塗布した新塗料との電気化学的作用による犠牲防食作用を得ることができる。新防錆材料としては、例えば、有機ジンクリッチペイントや無機ジンクリッチペイントを用いることができる。無機ジンクリッチペイントの空気孔は、霧状のミストコートを噴霧することによって封孔する。
[Rust prevention layer forming process]
In the rust preventive layer forming step S14, the exposed steel member exposed surface by cutting and removing all of the original rust preventive layer 1 or the deep side remaining after cutting and removing the surface layer part of the original rust preventive layer 1 This is a step of forming a new rust preventive layer by applying a new rust preventive material on the rust preventive layer. The rust preventive layer can be formed by a method other than this. In this case, a new rust preventive material having a rust preventive effect is applied to form a new rust preventive layer, and new paint is applied to the new rust preventive layer to form a new external coating layer. For the new rust preventive layer, zinc having a greater ionization tendency than steel (Fe), that is, a new rust preventive material mainly composed of Zn is suitable. By forming a new rust preventive layer by applying this new rust preventive material, it is possible to obtain a sacrificial anticorrosive effect due to an electrochemical action of the new rust preventive material and the new paint applied thereon. As the new rust preventive material, for example, organic zinc rich paint or inorganic zinc rich paint can be used. The air holes of the inorganic zinc-rich paint are sealed by spraying a mist-like mist coat.
［塗り替え工程］
前記塗り替え工程Ｓ１５は、前記錆止め層形成工程Ｓ１４により形成された新たな錆止め層の外側に新たな塗料を塗って新外塗り層を形成する工程である。この実施形態では、前記新錆止め層の外側（上）にエポキシ樹脂が中塗りされ、そのエポキシ樹脂の外側にフッ素系樹脂やポリウレタン系樹脂が上塗りされて外塗り層が形成してある。前記新外塗り層は一例であり、新外塗り層の構造はこれ以外であってもよい。
[Repainting process]
The repainting step S15 is a step of forming a new external coating layer by applying new paint on the outside of the new rust preventive layer formed in the rust preventive layer forming step S14. In this embodiment, an epoxy resin is intermediately coated on the outer side (upper side) of the new rust preventive layer, and a fluorine resin or a polyurethane resin is overcoated on the outer side of the epoxy resin to form an outer coating layer. The new outer coating layer is an example, and the structure of the new outer coating layer may be other than this.
（誘導加熱装置）
本発明の塗り替え工法は、例えば、図３〜図６に示す誘導加熱装置１０を用いて実施することができる。この誘導加熱装置１０は、加熱ヘッド１１と、変流器ＣＴと、高周波電源１２（図５、図６）と、循環装置１３（図５）を備えたものである。誘導加熱装置１０が低周波誘導加熱装置の場合は、図５の高周波電源１２は低周波電源となる。図５の循環装置１３は水冷式の場合であるが、空冷式、その他の冷却方式であってもよい。
(Induction heating device)
The repainting method of the present invention can be carried out using, for example, the induction heating device 10 shown in FIGS. The induction heating device 10 includes a heating head 11, a current transformer CT, a high frequency power source 12 (FIGS. 5 and 6), and a circulation device 13 (FIG. 5). When the induction heating device 10 is a low frequency induction heating device, the high frequency power supply 12 in FIG. 5 is a low frequency power supply. The circulation device 13 in FIG. 5 is a water-cooled type, but may be an air-cooled type or another cooling type.
前記加熱ヘッド１１は、ベース１４と、加熱コイル１５と、加熱コイル１５の両端部に設けられたコイル電極１６ａ、１６ｂと、ベース１４から立設されて対向配置された二枚の支持材１８と、両支持材１８間に配置固定された機器取付け部２０と、機器取付け部２０に取り付けられたセンサ取付け部２１を備えている。 The heating head 11 includes a base 14, a heating coil 15, coil electrodes 16a and 16b provided at both ends of the heating coil 15, and two support members 18 standing upright from the base 14 and facing each other. A device mounting portion 20 arranged and fixed between the support members 18 and a sensor mounting portion 21 mounted on the device mounting portion 20.
前記加熱コイル１５には金属パイプが使用され、その金属パイプの内部空間は冷媒通路として冷却媒体、例えば冷却水や冷却空気（冷却ガス）を流して循環させられるようにしてある。図３に示す加熱コイル１５は一本の金属パイプが平面視楕円形状に曲げ加工されたものであり、その外周面には絶縁処理が施されている。加熱コイル１５は、平面視楕円形状の部分がベース１４のセット空間に配置され、その両端部にコイル電極１６ａ、１６ｂが設けられている。加熱コイル１５の両端部は、それぞれのコイル電極１６ａ、１６ｂに設けられた通孔２２に連結され、加熱コイル１５内に冷却媒体を循環させられるようにしてある。通孔２２の上下には止め孔２３が開口されている。 A metal pipe is used for the heating coil 15, and an internal space of the metal pipe serves as a coolant passage for circulating a cooling medium such as cooling water or cooling air (cooling gas). The heating coil 15 shown in FIG. 3 is formed by bending a single metal pipe into an elliptical shape in plan view, and its outer peripheral surface is subjected to insulation treatment. The heating coil 15 has an elliptical shape in plan view arranged in the set space of the base 14, and has coil electrodes 16a and 16b at both ends thereof. Both ends of the heating coil 15 are connected to through holes 22 formed in the respective coil electrodes 16a and 16b so that a cooling medium can be circulated in the heating coil 15. Stop holes 23 are opened above and below the through hole 22.
前記二つの支持材１８はＬ字状部材であり、両支持材１８の間に機器取付け部２０が設けられている。一例として図３に示す機器取付け部２０は金属平板であり、後端側に凹部２４が設けられている。凹部２４には、変流器ＣＴとの連結固定に用いる連結材２５の一部が嵌合するようにしてある。機器取付け部２０の上面には、側面視三角形状の台座２６が設けられ、その台座２６の上面にセンサ取付け部２１が設けられている。センサ取付け部２１には、開口部が形成され、その開口部に非接触の温度センサ２７を差し込めるようにしてある。温度センサ２７には汎用の非接触の温度センサ２７を使用することができる。温度センサ２７は、加熱コイル１５を鋼部材Ｘの外周に宛がったときに、当該鋼部材Ｘ表面までの距離が１００ｍｍ程度となるようにするのが適する。ただし、この数値は一例であり、これ以外であってもよい。 The two support members 18 are L-shaped members, and a device mounting portion 20 is provided between the support members 18. As an example, the device mounting portion 20 shown in FIG. 3 is a metal flat plate, and the recess 24 is provided on the rear end side. A part of the connecting member 25 used for connecting and fixing the current transformer CT is fitted in the recess 24. A pedestal 26 having a triangular shape in a side view is provided on the upper surface of the device mounting portion 20, and a sensor mounting portion 21 is provided on the upper surface of the pedestal 26. An opening is formed in the sensor mounting portion 21, and a non-contact temperature sensor 27 can be inserted into the opening. A general-purpose non-contact temperature sensor 27 can be used as the temperature sensor 27. It is suitable for the temperature sensor 27 that the distance to the surface of the steel member X is about 100 mm when the heating coil 15 is applied to the outer periphery of the steel member X. However, this numerical value is an example, and other values may be used.
前記変流器ＣＴは、加熱ヘッド１１及び高周波電源１２に連結され、高周波電源１２からの電流を加熱コイル１５に供給するのに適した電流（大電流）に変換するものである。変流器ＣＴには、産業用ＩＨに汎用の変流器を使用することができる。現場作業の利便性の面から、携行可能なハンディー式の変流器ＣＴが好ましい。 The current transformer CT is connected to the heating head 11 and the high frequency power source 12, and converts the current from the high frequency power source 12 into a current (large current) suitable for supplying to the heating coil 15. As the current transformer CT, a general-purpose current transformer for industrial IH can be used. A portable handheld current transformer CT is preferable from the viewpoint of convenience of field work.
前記変流器ＣＴには前記連結材２５が連結されている。一例として図４（ａ）に示す連結材２５は二つの金属製のブロックであり、当該ブロックの上面に凸部２８が形成されている。連結材２５の側方には、作業者が作業時に握るハンドル３０が設けられている。連結材２５の前面には半円盤状の給電部（外部電極）２９ａ、２９ｂが固定されている。図４（ａ）の外部電極２９ａ、２９ｂは肉厚の銅板であり、ほぼ中央部に通孔３１が貫通され、その上下に止め孔３２が開口されている。通孔３１の端面には漏洩防止用のパッキン３３が嵌合されている。パッキン３３はゴム、樹脂等の弾性材で成型されている。外部電極２９ａ、２９ｂは銅以外の金属製であってもよい。 The connecting member 25 is connected to the current transformer CT. As an example, the connecting member 25 shown in FIG. 4A is a block made of two metals, and the convex portion 28 is formed on the upper surface of the block. On the side of the connecting member 25, a handle 30 that is gripped by an operator during work is provided. On the front surface of the connecting member 25, semi-disc-shaped power feeding portions (external electrodes) 29a and 29b are fixed. The external electrodes 29a and 29b in FIG. 4A are thick copper plates, and a through hole 31 is penetrated through substantially the central portion, and stop holes 32 are opened above and below the through hole 31. A packing 33 for preventing leakage is fitted on the end surface of the through hole 31. The packing 33 is molded of an elastic material such as rubber or resin. The external electrodes 29a and 29b may be made of a metal other than copper.
前記変流器ＣＴは、連結材２５を加熱ヘッド１１の機器取付け部２０に固定することによって、加熱ヘッド１１に連結されている。具体的には、変流器ＣＴの外部電極２９ａ、２９ｂとコイル電極１６ａ、１６ｂを突き合わせ、通孔２２、３１同士を連通させるとともに、連結材２５の凸部２８を機器取付け部２０の凹部２４に嵌合し、所定箇所を螺子止めすることによって、変流器ＣＴと加熱ヘッド１１とが連結されている。 The current transformer CT is connected to the heating head 11 by fixing the connecting member 25 to the device mounting portion 20 of the heating head 11. Specifically, the external electrodes 29a, 29b of the current transformer CT are butted against the coil electrodes 16a, 16b to make the through holes 22, 31 communicate with each other, and the convex portion 28 of the connecting member 25 is made into the concave portion 24 of the device mounting portion 20. The current transformer CT and the heating head 11 are connected to each other by fitting them to each other and screwing them at a predetermined position.
変流器ＣＴには、蛇腹式の保護ホース３４が接続されている。保護ホース３４内には電源ケーブル（図示しない）が配設されるとともに、冷媒ホースが配管されている。電源ケーブルは外部電極２９ａ、２９ｂと変流器ＣＴの間に配線され、変流器ＣＴから外部電極２９ａ、２９ｂに交流電流を給電し、その外部電極２９ａ、２９ｂと接続されるコイル電極１６ａ、１６ｂから加熱コイル１５に交流電流が供給されるようにしてある。冷媒ホースは加熱コイル１５内に冷却媒体を供給する供給ホース３５と加熱コイル１５内を通過した冷却媒体が戻る戻りホース３６を備えている。両ホース３５、３６は循環装置１３と外部電極２９ａ、２９ｂの通孔３１に連結され、循環装置１３−吸水ホース３５−高周波電源１２の冷却板３８−外部電源２９ａ、２９ｂの通孔３１−コイル電極１６ａ、１６ｂの通孔２２−加熱コイル１５内の冷媒通路−戻りホース３６−循環装置１３の冷却経路を循環して、前記冷却板３８及び加熱コイル１５が冷却されるようにしてある。前記冷却経路には、冷却媒体の温度を計測する白金側温体３９とともに、流量調整用の電磁バルブ４０及び逆流防止弁４１が設けられている。 A bellows type protection hose 34 is connected to the current transformer CT. A power cable (not shown) is arranged in the protective hose 34, and a refrigerant hose is provided therein. The power cable is wired between the external electrodes 29a, 29b and the current transformer CT, supplies alternating current from the current transformer CT to the external electrodes 29a, 29b, and is connected to the external electrodes 29a, 29b. An alternating current is supplied to the heating coil 15 from 16b. The refrigerant hose includes a supply hose 35 that supplies a cooling medium into the heating coil 15 and a return hose 36 that returns the cooling medium that has passed through the heating coil 15. Both hoses 35 and 36 are connected to the circulation device 13 and the through holes 31 of the external electrodes 29a and 29b, and the circulation device 13-the water absorption hose 35-the cooling plate 38 of the high frequency power source 12-the through holes 31 of the external power sources 29a and 29b-the coil The cooling plate 38 and the heating coil 15 are cooled by circulating through the through holes 22 of the electrodes 16a and 16b, the refrigerant passage in the heating coil 15, the return hose 36, and the cooling path of the circulation device 13. The cooling path is provided with a platinum side heating element 39 for measuring the temperature of the cooling medium, an electromagnetic valve 40 for adjusting the flow rate, and a backflow prevention valve 41.
前記保護ホース３４の外側にはケーブル４２が配設され、その一端側に温度センサ２７が、他端側に温度センサ２７からの検知信号を増幅する増幅器４３が接続されている。 A cable 42 is arranged outside the protective hose 34, one end of which is connected to the temperature sensor 27, and the other end of which is connected to an amplifier 43 which amplifies a detection signal from the temperature sensor 27.
図示は省略するが、前記誘導加熱装置１０は、例えば、電源スイッチ、出力コントローラ、タイマ、パワーメータ、ワーク温度表示器、冷媒温度表示器、加熱オン中表示灯、アラームリセットスイッチ、非常停止スイッチ、非接触センサアンプ、変流器ＣＴの押釦スイッチ等を備えた制御盤で操作することができる。制御盤は遠隔操作することもできる。 Although not shown, the induction heating device 10 includes, for example, a power switch, an output controller, a timer, a power meter, a work temperature indicator, a refrigerant temperature indicator, a heating ON indicator light, an alarm reset switch, an emergency stop switch, It can be operated by a control panel equipped with a non-contact sensor amplifier, a push button switch of the current transformer CT, and the like. The control panel can also be operated remotely.
前記電源スイッチは電源を入れるもの、出力コントローラは出力調整ボリュームにて出力を設定するもの、タイマは加熱オフ時間を設定するもの、パワーメータは加熱オン時の電力を表示するもの、ワーク温度表示器は非接触の温度センサ２７（図６）の上限温度を設定するもの、冷媒温度表示器は冷却媒体入口側の白金測温体３９（図５）の上限温度を設定するもの、加熱オン中表示灯は変流器ＣＴ側の加熱スイッチがオンであることを示すもの、アラームリセットスイッチはアラームをリセットするもの、非常停止スイッチは非常時に加熱オンを停止するもの、非接触センサアンプ（温度センサアンプ）は非接触の温度センサ２７（図６）の検知信号を取込んで増幅するもの、変流器ＣＴの押釦スイッチは加熱オンと加熱オフを切り替えるものである。 The power switch is for turning on the power, the output controller is for setting the output with the output adjusting volume, the timer is for setting the heating off time, the power meter is for displaying the electric power when the heating is on, and the work temperature indicator. Is for setting the upper limit temperature of the non-contact temperature sensor 27 (FIG. 6), the refrigerant temperature indicator is for setting the upper limit temperature of the platinum temperature sensing element 39 (FIG. 5) on the cooling medium inlet side, and the heating ON display The light indicates that the heating switch on the current transformer CT side is on, the alarm reset switch resets the alarm, the emergency stop switch stops heating on in an emergency, the non-contact sensor amplifier (temperature sensor amplifier ) Is for taking in and amplifying the detection signal of the non-contact temperature sensor 27 (FIG. 6), and the push button switch of the current transformer CT is for switching between heating on and heating off.
前記使用装置は一例であり、本発明の塗り替え工法は他の誘導加熱装置を用いて実施することもできる。 The above-mentioned apparatus is an example, and the repainting method of the present invention can be carried out using another induction heating apparatus.
（実施例１）
本発明の塗り替え工法の第一の実施例を、図１を参照して説明する。この実施例は、前記使用装置を用いて前記実施形態１に記載の塗り替え工法を実施する場合の例である。
（１）塗装の塗り替えに先立ち、足場や飛散防止設備等を準備する（事前準備）。
（２）前記誘導加熱装置１０を、塗り替え対象である鋼部材Ｘの表面に宛がう。
（３）鋼部材Ｘの表面に宛がった状態で、変流器ＣＴのスイッチをオンにして誘導加熱装置１０に交流電源を供給し、誘導加熱により鋼部材Ｘを加熱する。
（４）前記（３）の状態を維持しながら、誘導加熱装置１０を鋼部材Ｘに沿って移動させる。このとき、誘導加熱装置１０の移動スピードは、加熱対象箇所が１５０℃から２００℃程度となるスピードとするのが好ましい。
（５）誘導加熱装置１０による誘導加熱によって鋼部材Ｘを加熱すると、その熱によって外塗り層２が軟化して錆止め層１から分離する（（２）〜（５）が軟化工程Ｓ１）。
（６）錆止め層１から分離した外塗り層２を、カワスキやスクレーパ等でシート状態あるいは飛散しないような状態で剥離する。剥離後の錆止め層１の表面に塗装が残っているときは、残った塗装もカワスキやスクレーパ等で掻きとる（剥離工程Ｓ２）。
（７）シート状態あるいは飛散しないような状態で剥離した剥離片及びカワスキ等で掻きとった残りの塗装片を回収する（外塗り層回収工程Ｓ２ａ）。場合によっては、外塗り層との付着力を高めるため、研削材に重曹を用いた重曹ブラストや素地調整の可能なバキュームブラストやレーザーブラストで、錆止め層１の表面をブラストする（再ブラスト工程：図１のＳ２ｂ）こともできる。この場合のブラストは錆止め層１を過度に傷つけない程度に行う。
（８）外塗り層２の剥離によって露出した錆止め層１の外側又は前記のように再ブラストした錆止め層１の外側に、新塗料を塗り、新外塗り層を形成する（塗り替え工程Ｓ３）。
(Example 1)
A first embodiment of the repainting method of the present invention will be described with reference to FIG. This example is an example of the case where the repainting method described in the first embodiment is performed using the apparatus for use.
(1) Prior to repainting, prepare scaffolding and anti-scattering equipment (preparation).
(2) The induction heating device 10 is applied to the surface of the steel member X to be repainted.
(3) With the surface of the steel member X facing, the switch of the current transformer CT is turned on to supply AC power to the induction heating device 10 to heat the steel member X by induction heating.
(4) The induction heating device 10 is moved along the steel member X while maintaining the state of (3). At this time, it is preferable that the induction heating device 10 be moved at a speed at which the heating target portion is about 150° C. to 200° C.
(5) When the steel member X is heated by induction heating by the induction heating device 10, the heat softens the outer coating layer 2 and separates it from the rust preventive layer 1 ((2) to (5) is a softening step S1).
(6) The outer coating layer 2 separated from the rust preventive layer 1 is peeled off by a kawaski or scraper in a sheet state or in a state where it does not scatter. When coating remains on the surface of the rust preventive layer 1 after peeling, the remaining coating is also scraped off with a kawaski or scraper (peeling step S2).
(7) The peeled pieces that have been peeled off in a sheet state or a state in which they do not scatter and the remaining coated pieces scraped off with a kawaski or the like are collected (external coating layer collecting step S2a). In some cases, the surface of the rust preventive layer 1 is blasted by a baking soda blast using baking soda as an abrasive, a vacuum blast or a laser blast capable of adjusting the base material in order to enhance the adhesion with the outer coating layer (re-blasting step: It is also possible to perform S2b) in FIG. Blasting in this case is performed to such an extent that the rust preventive layer 1 is not excessively damaged.
(8) A new paint is applied to the outside of the rust preventive layer 1 exposed by peeling of the outer coat layer 2 or the outside of the rust preventive layer 1 reblasted as described above to form a new outer coat layer (repainting step S3).
（実施例２）
本発明の塗り替え工法の第二の実施例を、図２を参照して説明する。この実施例は、前記使用装置を用いて前記実施形態２に記載の塗り替え工法を実施する場合の例である。
（１）塗装の塗り替えに先立ち、足場や飛散防止設備等を準備する（事前準備）。
（２）前記誘導加熱装置１０を、塗り替え対象である鋼部材Ｘの表面に宛がう。
（３）鋼部材Ｘの表面に宛がった状態で、変流器ＣＴのスイッチをオンにして誘導加熱装置１０に交流電源を供給し、誘導加熱により鋼部材Ｘを加熱する。
（４）前記（３）の状態を維持しながら、誘導加熱装置１０を鋼部材Ｘに沿って移動させる。このとき、誘導加熱装置１０の移動スピードは、加熱対象箇所が１５０℃から２００℃程度となるスピードとするのが好ましい。
（５）誘導加熱装置１０による誘導加熱によって鋼部材Ｘを加熱すると、その熱によって外塗り層２が軟化して錆止め層１から分離する（（２）〜（５）が軟化工程Ｓ１１）。
（６）錆止め層１から分離した外塗り層２を、カワスキやスクレーパ等でシート状態あるいは飛散しないような状態で剥離する。剥離後の錆止め層１の表面に塗装が残っているときは、残った塗装もカワスキやスクレーパ等で掻きとる（剥離工程Ｓ１２）。
（７）シート状態あるいは飛散しないような状態で剥離した剥離片及びカワスキ等で掻きとった残りの塗装片を回収する（外塗り層回収工程Ｓ１２ａ）。
（８）外塗り層２の剥離によって露出した錆止め層１を、グラインダーやサンダー、カップブラシ、バキュームブラスト、レーザーブラスト等の機械器具によって切削除去して鋼部材Ｘの表面の一部もしくはすべてを露出させる。
（９）切削した錆止め層１の切削粉は回収する（錆止め層回収工程Ｓ１３ａ）。ただし、バキュームブラストの場合は回収機能があるため、ブラストとは別に回収する必要はない。レーザーブラストの場合、塗膜は気化する。
（１０）錆止め層１の切削によって露出した鋼部材露出面に新たな錆止め材として無機ジンクを塗布し、その無機ジンクの外側から霧状のミストコートを噴霧して無機ジンク中の空気孔を埋めて新たな錆止め層１を形成する（錆止め層形成工程Ｓ１４）。新防錆材料の塗布前に鋼部材Ｘをバキュームブラスト等により再度ブラストしてもよい（再ブラスト工程Ｓ１３ｂ）。バキュームブラストやレーザーブラストの場合、錆止め層回収工程Ｓ１３ａと再ブラスト工程Ｓ１３ｂを同時に行うことができる。
（１１）新たな錆止め層１の外側に新塗料を塗り、新たな外塗り層２を形成する（塗り替え工程Ｓ１５）。
(Example 2)
A second embodiment of the repainting method of the present invention will be described with reference to FIG. This example is an example of the case where the repainting method described in the second embodiment is performed using the apparatus for use.
(1) Prior to repainting, prepare scaffolding and anti-scattering equipment (preparation).
(2) The induction heating device 10 is applied to the surface of the steel member X to be repainted.
(3) With the surface of the steel member X facing, the switch of the current transformer CT is turned on to supply AC power to the induction heating device 10 to heat the steel member X by induction heating.
(4) The induction heating device 10 is moved along the steel member X while maintaining the state of (3). At this time, it is preferable that the induction heating device 10 be moved at a speed at which the heating target portion is about 150° C. to 200° C.
(5) When the steel member X is heated by induction heating by the induction heating device 10, the outer coating layer 2 is softened by the heat and separated from the rust preventive layer 1 ((2) to (5) is a softening step S11).
(6) The outer coating layer 2 separated from the rust preventive layer 1 is peeled off by a kawaski or scraper in a sheet state or in a state where it does not scatter. When coating remains on the surface of the rust preventive layer 1 after peeling, the remaining coating is also scraped off with a kawaski or scraper (peeling step S12).
(7) The peeled pieces that have been peeled off in a sheet state or in a state where they do not scatter, and the remaining coated pieces scraped off with kawasaki etc. are collected (external coating layer collecting step S12a).
(8) The rust preventive layer 1 exposed by peeling off the outer coating layer 2 is cut and removed by a machine tool such as a grinder, a sander, a cup brush, a vacuum blast, or a laser blast to expose a part or all of the surface of the steel member X. Let
(9) The cutting powder of the cut rust preventive layer 1 is recovered (rust preventive layer collecting step S13a). However, in the case of vacuum blast, there is no need to collect separately from the blast because it has a collection function. In the case of laser blasting, the coating vaporizes.
(10) Inorganic zinc is applied as a new rust preventive material to the exposed surface of the steel member exposed by cutting the rust preventive layer 1, and a mist-like mist coat is sprayed from the outside of the inorganic zinc to fill the air holes in the inorganic zinc. To form a new rust preventive layer 1 (rust preventive layer forming step S14). The steel member X may be blasted again by vacuum blasting or the like before the application of the new anticorrosion material (reblasting step S13b). In the case of vacuum blasting or laser blasting, the rust preventive layer collecting step S13a and the reblasting step S13b can be performed simultaneously.
(11) A new paint is applied to the outside of the new rust preventive layer 1 to form a new outer coat layer 2 (repainting step S15).
（その他の実施例）
前記両実施例は一例であり、本発明の塗装塗り替え工法は、これ以外の手順で実施することもできる。
(Other embodiments)
The above-mentioned two embodiments are merely examples, and the paint repainting method of the present invention can be carried out by other procedures.
本発明の塗り替え工法は、各種鋼構造物の塗装の塗り替えに適用することができるが、鋼橋の鋼桁や海洋構造物、タンク、水門、プラント、各種鉄塔といった重防食塗装が採用される各種鋼部材の塗装の塗り替えに特に適する工法である。 The repainting method of the present invention can be applied to repainting of various steel structures, but various heavy corrosion resistant coatings such as steel girders of steel bridges, offshore structures, tanks, sluices, plants, and various steel towers are adopted. This method is particularly suitable for repainting steel members.
１ 錆止め層
２ 外塗り層
１０ 高周波誘導加熱装置（誘導加熱装置）
１１ 加熱ヘッド
１２ 高周波電源
１３ 循環装置
１４ ベース
１５ 加熱コイル
１６ａ、１６ｂ コイル電極
１８ 支持材
２０ 機器取付け部
２１ センサ取付け部
２２ 通孔
２３ 止め孔
２４ 凹部
２５ 連結材
２６ 台座
２７ 温度センサ
２８ 凸部
２９ａ、２９ｂ 給電部（外部電極）
３０ ハンドル
３１ 通孔
３２ 止め孔
３３ パッキン
３４ 保護ホース
３５ 供給ホース
３６ 戻りホース
３８ 冷却板
３９ 白金側温体
４０ 流量調整バルブ
４１ 逆流防止弁
４２ ケーブル
４３ 増幅器
ＣＴ 変流器
Ｘ 鋼部材
1 Rust preventive layer 2 External coating layer 10 High frequency induction heating device (induction heating device)
11 Heating Head 12 High Frequency Power Supply 13 Circulation Device 14 Base 15 Heating Coil 16a, 16b Coil Electrode 18 Supporting Material 20 Equipment Mounting Part 21 Sensor Mounting Part 22 Through Hole 23 Stopping Hole 24 Recess 25 Connecting Material 26 Pedestal 27 Temperature Sensor 28 Convex 29a , 29b Power supply unit (external electrode)
30 Handle 31 Through Hole 32 Stop Hole 33 Packing 34 Protection Hose 35 Supply Hose 36 Return Hose 38 Cooling Plate 39 Platinum Side Heater 40 Flow Control Valve 41 Backflow Prevention Valve 42 Cable 43 Amplifier CT Current Transformer X Steel Member
Claims (7)
手持ち式の誘導加熱装置を前記鋼部材の外側に宛がい、その鋼部材の外側に宛がった手持ち式の誘導加熱装置の誘導加熱で鋼部材表面を加熱して当該鋼部材表面の塗装のうち錆止め層の外側の外塗り層を軟化させる軟化工程と、
軟化した外塗り層を剥離手段によって錆止め層からシート状態あるいは飛散しないで固まった状態で剥離する剥離工程と、
外塗り層の剥離によって露出した既存の錆止め層をブラストすることなく、当該錆止め層の上に新たな塗料を塗って鋼部材の塗装を塗り替える塗り替え工程を備えた、
ことを特徴とする塗装塗り替え工法。 It is a method of peeling off the coating on the steel member surface and repainting it,
A hand-held induction heating device is applied to the outside of the steel member, and the surface of the steel member is heated by induction heating of a hand-held induction heating device that is directed to the outside of the steel member. Of which, a softening step of softening the outer coating layer outside the rust preventive layer,
A peeling step of peeling the softened outer coating layer from the rust preventive layer by a peeling means in a sheet state or in a solid state without scattering,
Equipped with a repainting step of repainting the steel member by applying a new paint on the rust preventive layer without blasting the existing rust preventive layer exposed by peeling the outer coat layer,
A paint repainting method characterized by that.
手持ち式の誘導加熱装置を前記鋼部材の外側に宛がい、その鋼部材の外側に宛がった手持ち式の誘導加熱装置の誘導加熱で鋼部材表面を加熱して当該鋼部材表面の塗装のうち錆止め層の外側の外塗り層を軟化させる軟化工程と、
軟化した外塗り層を剥離手段によって錆止め層からシート状態あるいは飛散しないで固まった状態で剥離する剥離工程と、
外塗り層の剥離によって露出した既存の錆止め層をブラストする再ブラスト工程と、
前記ブラスト加工された既存の錆止め層の上に、新たな塗料を塗って鋼部材の塗装を塗り替える塗り替え工程を備えた、
ことを特徴とする塗装塗り替え工法。 It is a method of peeling off the coating on the steel member surface and repainting it,
A hand-held induction heating device is applied to the outside of the steel member, and the surface of the steel member is heated by induction heating of a hand-held induction heating device that is directed to the outside of the steel member. Of which, a softening step of softening the outer coating layer outside the rust preventive layer,
A peeling step of peeling the softened outer coating layer from the rust preventive layer by a peeling means in a sheet state or in a solid state without scattering,
A re-blasting step of blasting the existing rust preventive layer exposed by peeling the outer coating layer,
On the existing rust-prevented layer that has been blasted, a repainting process of repainting the steel member by applying a new paint is provided,
A paint repainting method characterized by that.
手持ち式の誘導加熱装置を前記鋼部材の外側に宛がい、その鋼部材の外側に宛がった手持ち式の誘導加熱装置の誘導加熱で鋼部材表面を加熱して当該鋼部材表面の塗装のうち錆止め層の外側の外塗り層を軟化させる軟化工程と、
軟化した外塗り層を剥離手段によって錆止め層からシート状態あるいは飛散しないで固まった状態で剥離する剥離工程と、
外塗り層の剥離によって露出した錆止め層の一部又は全部を切削する切削工程と、
前記切削工程で一部切削により残された残存錆止め層、又は全部切削により露出した鋼部材露出面をブラストをすることなく、当該残存錆止め層の上又は鋼部材露出面の上に新たな防錆材料を塗布して新たな錆止め層を形成する錆止め層形成工程と、
前記新たな錆止め層の外側に新たな塗料を塗って鋼部材の塗装を塗り替える塗り替え工程を備えた、
ことを特徴とする塗装塗り替え工法。 It is a method of peeling off the coating on the steel member surface and repainting it,
A hand-held induction heating device is applied to the outside of the steel member, and the surface of the steel member is heated by induction heating of a hand-held induction heating device that is directed to the outside of the steel member. Of which, a softening step of softening the outer coating layer outside the rust preventive layer,
A peeling step of peeling the softened outer coating layer from the rust preventive layer by a peeling means in a sheet state or in a solid state without scattering,
A cutting step of cutting part or all of the rust preventive layer exposed by peeling of the outer coating layer,
The residual rust layer left by the partially cutting in the cutting step, or without the blasting steel member exposed surface exposed by all the cutting, new rust on the upper or steel member exposed surface of the remaining rust layer A rust preventive layer forming step of applying a material to form a new rust preventive layer,
A repainting process of repainting the steel member by applying a new paint to the outside of the new rust preventive layer,
A paint repainting method characterized by that.
手持ち式の誘導加熱装置を前記鋼部材の外側に宛がい、その鋼部材の外側に宛がった手持ち式の誘導加熱装置の誘導加熱で鋼部材表面を加熱して当該鋼部材表面の塗装のうち錆止め層の外側の外塗り層を軟化させる軟化工程と、
軟化した外塗り層を剥離手段によって錆止め層からシート状態あるいは飛散しないで固まった状態で剥離する剥離工程と、
外塗り層の剥離によって露出した錆止め層の一部又は全部を切削する切削工程と、
前記切削工程で一部切削により残された残存錆止め層又は、全部切削により露出した鋼部材露出表面をブラスト加工する再ブラスト工程と、
前記ブラスト加工された残存錆止め層又は鋼部材露出表面に、新たな防錆材料を塗布して新たな錆止め層を形成する錆止め層形成工程と、
前記新たな錆止め層の外側に新たな塗料を塗って鋼部材の塗装を塗り替える塗り替え工程を備えた、
ことを特徴とする塗装塗り替え工法。 It is a method of peeling off the coating on the steel member surface and repainting it,
A hand-held induction heating device is applied to the outside of the steel member, and the surface of the steel member is heated by induction heating of a hand-held induction heating device that is directed to the outside of the steel member. Of which, a softening step of softening the outer coating layer outside the rust preventive layer,
A peeling step of peeling the softened outer coating layer from the rust preventive layer by a peeling means in a sheet state or in a solid state without scattering,
A cutting step of cutting part or all of the rust preventive layer exposed by peeling of the outer coating layer,
A residual rust preventive layer left by partial cutting in the cutting step, or a reblasting step of blasting the exposed steel member exposed surface by complete cutting ,
The blasted residual rust layer or steel member exposed surface, a rust preventive layer forming step of forming a new rust layer by applying the new was Do anticorrosive material,
A repainting process of repainting the steel member by applying a new paint to the outside of the new rust preventive layer,
A paint repainting method characterized by that.
鋼よりもイオン化傾向の大きな亜鉛を主体とした防錆材料を塗布して新たな錆止め層を形成して、新たな錆止め層とその上に塗布した新たな塗料との電気化学的作用による犠牲防食作用が得られるようにした、
ことを特徴とする塗装塗り替え工法。 In the paint repainting method according to claim 3 or 4,
A new rust preventive layer is formed by applying a rust preventive material mainly composed of zinc, which has a greater ionization tendency than steel, and sacrificial corrosion by the electrochemical action of the new rust preventive layer and the new paint applied on it. I tried to get the effect,
A paint repainting method characterized by that.
錆止め層と外塗り層の膨張係数の差異により、錆止め層を残して塗膜を分離できるように誘導加熱装置による加熱温度を、剥離する鋼部材の表面温度が１５０℃〜２００℃となる温度に設定した、
ことを特徴とする塗装塗り替え工法。 The paint repainting method according to any one of claims 1 to 5,
Than different from the difference in expansion coefficient of rust layer and outer coating layer, the heating temperature by the induction heating apparatus so that it can separate the coated film leaving the rust layer, the surface temperature of the steel member to be peeled off is 0.99 ° C. to 200 DEG ° C. Set to temperature,
A paint repainting method characterized by that.
塗り替え前の鋼部材の塗装系が、防錆材料として無機ジンクリッチペイントが用いられた塗装系である、又は、鉛丹もしくは鉛系錆止めペイントが用いられた塗装系である、
ことを特徴とする塗装塗り替え工法。 The paint repainting method according to any one of claims 1 to 6,
The coating system of the steel member before repainting is a coating system in which an inorganic zinc rich paint is used as a rust preventive material, or a coating system in which a red lead or lead-based rust preventive paint is used,
A paint repainting method characterized by that.
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| JP6595135B1 (en) * | 2019-02-22 | 2019-10-23 | 一般社団法人日本パルスレーザー振興協会 | Construction method and system using pulse laser |
| CN112360175B (en) * | 2020-09-16 | 2022-04-22 | 上海宝冶建筑装饰有限公司 | Portable nail hole rust prevention device |
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