JPS6214352B2 - - Google Patents
Info
- Publication number
- JPS6214352B2 JPS6214352B2 JP58148030A JP14803083A JPS6214352B2 JP S6214352 B2 JPS6214352 B2 JP S6214352B2 JP 58148030 A JP58148030 A JP 58148030A JP 14803083 A JP14803083 A JP 14803083A JP S6214352 B2 JPS6214352 B2 JP S6214352B2
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- steel
- coating
- polyethylene
- plastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 87
- 239000010959 steel Substances 0.000 claims description 87
- 238000005260 corrosion Methods 0.000 claims description 64
- 238000000576 coating method Methods 0.000 claims description 61
- 239000011248 coating agent Substances 0.000 claims description 56
- -1 chromic acid compound Chemical class 0.000 claims description 48
- 229920003023 plastic Polymers 0.000 claims description 22
- 239000004033 plastic Substances 0.000 claims description 22
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 description 31
- 229920000573 polyethylene Polymers 0.000 description 31
- 239000006229 carbon black Substances 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 8
- 239000007921 spray Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000003822 epoxy resin Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229920000647 polyepoxide Polymers 0.000 description 6
- 238000007751 thermal spraying Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 4
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000005304 joining Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 239000008119 colloidal silica Substances 0.000 description 3
- 238000005536 corrosion prevention Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000006353 environmental stress Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229940106691 bisphenol a Drugs 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000008366 benzophenones Chemical class 0.000 description 1
- 125000003354 benzotriazolyl group Chemical class N1N=NC2=C1C=CC=C2* 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical class [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003902 salicylic acid esters Chemical class 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- NDKWCCLKSWNDBG-UHFFFAOYSA-N zinc;dioxido(dioxo)chromium Chemical compound [Zn+2].[O-][Cr]([O-])(=O)=O NDKWCCLKSWNDBG-UHFFFAOYSA-N 0.000 description 1
- KHADWTWCQJVOQO-UHFFFAOYSA-N zinc;oxido-(oxido(dioxo)chromio)oxy-dioxochromium Chemical compound [Zn+2].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KHADWTWCQJVOQO-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Description
【発明の詳細な説明】
この発明は、防食被覆鋼製部材を接合して構成
する防食被覆鋼製構造物の接合部防食施工法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrosion-proof construction method for a joint part of a corrosion-proof coated steel structure constructed by joining together corrosion-proof coated steel members.
従来、土木・建設用の鋼管杭、鋼管矢板は河
川、海岸、港湾などで構築物を建造する目的で多
数使用されてきた。これらの鋼製部材は屋外の自
然環境の中で、河川水、廃水、雨水、海水などの
水や大気、太陽光などに曝され、また土砂、泥、
瓦礫などに直接強く接するので著しく腐食が起り
易く、特に流水、波などと大気、太陽光とが交互
に作用する環境や場所、例えば港湾、河口などで
は、上述の腐食が激しく生じるのであるが、従
来、効果的な腐食防止策がなく、例えば無機ジン
ク塗料がタールエポキシ樹脂塗料による塗装、エ
ポキシ樹脂や不飽和ポリエステル樹脂による
FRP被覆などが用いられることがあつたが、そ
れらは機械的強度、長期の耐久性および経済性
（特に被覆時の作業性）などの点で効果的な防食
方法ではなかつた。 Conventionally, steel pipe piles and steel pipe sheet piles for civil engineering and construction have been used in large numbers for the purpose of constructing structures on rivers, coasts, ports, etc. These steel members are exposed to water such as river water, wastewater, rainwater, seawater, the atmosphere, sunlight, etc. in the outdoor natural environment, and are also exposed to dirt, mud,
Because it comes into direct and strong contact with debris, corrosion is extremely likely to occur, and the above-mentioned corrosion occurs particularly in environments and places where running water, waves, etc. interact with the atmosphere and sunlight, such as ports and estuaries. Until now, there have been no effective corrosion prevention measures, such as inorganic zinc paints, tar epoxy resin paints, epoxy resins and unsaturated polyester resins.
FRP coatings were sometimes used, but these were not effective corrosion prevention methods in terms of mechanical strength, long-term durability, and economy (especially workability during coating).
しかしその後、防食効果が高くかつ耐久性のす
ぐれた防食被覆材料として、プラスチツクス樹脂
特にポリオレフイン樹脂を押出して形成したプラ
スチツク層を、その加熱軟化状態のまま、接着剤
層を介して鋼管の表面上に密着させるという押出
被覆法によつて優れた防食被覆を有する鋼管杭が
製造され、また接着剤層を有する架橋プラスチツ
クシートを鋼矢板の表面に貼り合わせることによ
り優れた防食被覆を有する鋼矢板が製造され、実
用に供されるようになつてこれまでの問題は一挙
に解決へ近づいた。 However, later on, a plastic layer formed by extruding plastic resin, particularly polyolefin resin, was applied to the surface of the steel pipe through an adhesive layer while it was heated and softened, as a corrosion-resistant coating material with high corrosion-prevention effect and excellent durability. Steel pipe piles with an excellent anti-corrosion coating are manufactured using the extrusion coating method, and steel sheet piles with an excellent anti-corrosion coating are manufactured by laminating a cross-linked plastic sheet with an adhesive layer to the surface of the steel sheet pile. Once it was manufactured and put into practical use, all of the previous problems came close to being solved.
しかし、これらの防食被覆形成方法は工場生産
において多量にかつ安価にすぐれた防食被覆を施
す方法であつて、鋼管杭や鋼矢板を用いて構造物
を建造した後の溶接による接合部の防食被覆とし
ては用いられないという難点がある。鋼管杭を直
線状に溶接して接続された個所の場合や鋼管杭に
直角あるいは傾斜して鋼管を溶接して接続された
構造物の場合や、鋼管杭にＨ型鋼、Ｉ型鋼、山形
鋼等の鋼製部材を直角あるいは傾斜して溶接して
接続された構造物や鋼矢板を使用した構造物で
は、鋼製部材の表面にプラスチツク層を密着でき
ない個所が生じる。 However, these methods of forming anti-corrosion coatings are methods for applying excellent anti-corrosion coatings in large quantities and at low cost in factory production. The problem is that it cannot be used as such. In the case of locations where steel pipe piles are connected by welding them in a straight line, in the case of structures where steel pipes are welded at right angles or at an angle to the steel pipe piles, and where steel pipe piles are connected by welding steel pipes, H-type steel, I-type steel, angle-shaped steel, etc. In structures in which steel members are welded together at right angles or at an angle, or in structures using steel sheet piles, there are places where the plastic layer cannot be adhered to the surface of the steel members.
そこで本発明者らは、鋼管からなる鋼製部材相
互の直角接合または傾斜接合部付近あるいはＨ型
鋼やＩ型鋼のような異型断面の鋼製部材を使用し
た構築物の溶液による接合部付近に、防食効幹が
高くかつ耐久性のすぐれた防食被覆を施すことに
ついて鋭意研究した結果、この発明を完成した。 Therefore, the present inventors applied corrosion protection near the right angle or inclined joints of steel members made of steel pipes, or near the joints of structures using steel members with irregular cross sections such as H-type steel and I-type steel. This invention was completed as a result of intensive research into applying a highly effective and durable anti-corrosion coating.
すなわち、この発明は、プラスチツク防食被覆
を有する鋼製部材の接合予定部付近の防食被覆を
剥離除去して、前記鋼製部材を接合し、次に前記
鋼製部材の露出表面に、クロム酸化合物からなる
プライマー層を形成したのち、プラスチツクスの
粉末の溶射によりプラスチツクスの防食被覆を形
成することを特徴とする防食被覆鋼製構造物の接
合部防食旋工法を要旨とするものである。 That is, the present invention peels off and removes the anticorrosion coating near the joint portion of a steel member having a plastic anticorrosion coating, joins the steel member, and then coats the exposed surface of the steel member with a chromic acid compound. The gist of this invention is a method for corrosion-proof turning of joints of steel structures with corrosion-proof coating, which is characterized in that after forming a primer layer consisting of the following, an anti-corrosion coating of plastic is formed by thermal spraying of plastic powder.
次にこの発明を図示の例によつて説明する。 Next, the present invention will be explained using illustrated examples.
第１図ないし第４図はこの発明の第１実施例を
示すものであつて、まず第１図に示すように、プ
ラスチツクス例えばポリエチレンの重防食被覆を
施した多数の防食鋼管杭１が水底地盤２に打設さ
れる。この防食鋼管杭１としては、例えば鋼管杭
３の表面に厚さ1.5〜2.5mmまたはそれ以上のポリ
エチレンからなる重防食被覆４を接着剤を介して
一体に固着したものが用いられる。 1 to 4 show a first embodiment of the present invention, and as shown in FIG. It is poured into the ground 2. The anti-corrosion steel pipe pile 1 may be, for example, a steel pipe pile 3 with a heavy anti-corrosion coating 4 made of polyethylene having a thickness of 1.5 to 2.5 mm or more fixed to the surface thereof via an adhesive.
次に第２図に示すように、前記防食鋼管杭１に
おける連結部材取付予定部分の防食被覆が剥離さ
れ、かつ鋼管またはＨ型鋼、Ｉ型鋼等の異型断面
の鋼製連結部材５に前述のような重防食被覆６を
施して構成した防食鋼製連結部材７の端部の防食
被覆も予め工場または施工現場で適当な長さにわ
たつて除去される。 Next, as shown in FIG. 2, the anti-corrosion coating of the portion of the anti-corrosion steel pipe pile 1 where the connecting member is to be attached is peeled off, and a steel connecting member 5 of an irregular cross section such as a steel pipe or H-type steel or I-type steel is attached as described above. The anti-corrosion coating on the ends of the corrosion-resistant steel connecting member 7, which is coated with a heavy anti-corrosion coating 6, is also removed in advance over an appropriate length at the factory or at the construction site.
このように防食被覆を除去するのは、各鋼管杭
と鋼製連結部材とを溶接により接合する場合に、
防食被覆が溶接熱による悪影響を受けないように
し、かつ溶接性能や溶接作業性に影響を与えない
ようにするためであり、鋼管杭および鋼製連結部
材からなる鋼製部材の溶接部から約10〜15cmの範
囲にわたつて防食被覆が防去される。 The reason for removing the anti-corrosion coating in this way is when joining each steel pipe pile and the steel connecting member by welding.
This is to prevent the corrosion-resistant coating from being adversely affected by welding heat and to prevent it from affecting welding performance and welding workability. The anti-corrosion coating is removed over an area of ~15 cm.
鋼製部材相互の溶接接合を完了したのち、溶接
部に残存しているフラツクスや溶鉄の溶滓が除去
され、次いでサンドブラスト、グラインダーまた
はベルトサンダーなどで鋼材表面のミルスケール
が錆が除去される。 After welding and joining the steel members together, the flux and molten iron slag remaining in the weld are removed, and then mill scale and rust on the surface of the steel are removed using sandblasting, a grinder, or a belt sander.
次にプロパンガス・バーナーの火炎で鋼製部材
の表面が約40℃に加熱されてから、クロム酸化合
物の水溶液からなるプライマーまたはコロイダル
シリカを含有させたクロム酸化合物の水溶液から
なるプライマーが刷毛で鋼製部材の表面に塗布さ
れ、さらに乾燥されることにより、クロム酸化合
物の薄い膜またはクロム酸化合物と酸化珪素から
なる薄い膜が形成される。 Next, the surface of the steel part is heated to approximately 40°C with the flame of a propane gas burner, and then a primer made of an aqueous solution of a chromic acid compound or a primer made of an aqueous solution of a chromic acid compound containing colloidal silica is applied with a brush. By applying it to the surface of a steel member and drying it, a thin film of a chromic acid compound or a thin film of a chromic acid compound and silicon oxide is formed.
前記クロム酸化合物としては、例えば無水クロ
ム酸の水溶液が主体で、その無水クロム酸中の６
価クロムの10〜40％を３価クロムに還元した水溶
液を使用するのが好ましい。またその水溶液にコ
ロイド状に懸濁した酸化珪素（コロイダルシリ
カ）を添加（クロムに対し５〜50％）した混合水
溶液を使用すれば、耐水性はより向上する。 The chromic acid compound is mainly an aqueous solution of chromic anhydride, and 6
It is preferable to use an aqueous solution in which 10 to 40% of valent chromium is reduced to trivalent chromium. Further, if a mixed aqueous solution containing colloidally suspended silicon oxide (colloidal silica) added thereto (5 to 50% relative to chromium) is used, the water resistance is further improved.
またクロム酸化合物としては、無水クロム酸の
他にクロム酸亜鉛、重クロム酸亜鉛などを使用し
てもよい。プライマーの塗布量はクロム量で50〜
1000mg／m2の範囲で、望ましくは400〜600mg／m2
がよく、塗布量が少な過ぎると耐食性がなく、塗
布量が多過ぎると膜が脆くなつてポリエチレン被
覆と鋼製部材との接着力が低下してくる。次いで
必要であれば、ビスフエノール−Ａタイプが脂環
タイプのエポキシ樹脂プライマーが20〜100μの
厚さに同じく刷毛で塗布される。このエポキシ樹
脂プライマーは、２液型で主剤と硬化剤を必要量
だけ混合して塗布すれば反応して硬化し、加熱す
ることによつて更に硬化が速くなる。 Further, as the chromic acid compound, zinc chromate, zinc dichromate, etc. may be used in addition to chromic anhydride. The amount of primer applied is 50 ~ chrome amount
In the range of 1000mg/ m2 , preferably 400-600mg/ m2
If the coating amount is too small, corrosion resistance will be lost, and if the coating amount is too large, the film will become brittle and the adhesive force between the polyethylene coating and the steel member will decrease. Then, if necessary, an epoxy resin primer of the bisphenol-A type is cycloaliphatic type is also applied with a brush to a thickness of 20 to 100 microns. This epoxy resin primer is a two-component type, and when the base resin and curing agent are mixed in the required amount and applied, it reacts and cures, and the curing is further accelerated by heating.
次にガスバーナーで鋼製部材の表面が100〜200
℃に加熱されてから、ポリエチレンの粉末が溶射
ガンで溶射されて、第３図および第４図に示すよ
うに、部材接合部付近の表面にポリエチレンの防
食被覆８が一体に形成される。 Next, use a gas burner to burn the surface of the steel member to 100 to 200
After being heated to 0.degree. C., polyethylene powder is sprayed with a thermal spray gun to integrally form a polyethylene anticorrosive coating 8 on the surface near the joints of the members, as shown in FIGS. 3 and 4.
前記溶射ガンは、プロパンガスと酸素ガスとの
混合ガスを燃焼して火炎として噴射し、その火炎
の外側を圧送空気によつて定量的に送られてくる
ポリエチレン粉末を溶融しながら噴出して鋼製部
材の表面に噴射塗布し、それから溶融粉末は互い
に融着して連続したポリエチレンの防食被覆を形
成し、この防食被覆はそれぞれ工場で被覆された
鋼管杭の防食被覆は表面および鋼製連結部材の防
食被覆の表面とも充分に接着して一体となる。 The thermal spray gun burns a mixture of propane gas and oxygen gas and injects it as a flame, and the polyethylene powder that is quantitatively sent to the outside of the flame by compressed air is melted and ejected to form a steel. The molten powder is then fused together to form a continuous polyethylene anti-corrosion coating, which is applied to the surface of the steel pipe piles coated in the factory, respectively. It fully adheres to the surface of the anti-corrosion coating and becomes an integral part.
なお第３図において、９は各防食鋼管杭１の頂
部にわたつて架設されたコンクリートスラブであ
る。 In addition, in FIG. 3, 9 is a concrete slab constructed over the top of each anti-corrosion steel pipe pile 1.
第５図ないし第７図はこの発明の第２実施例を
示すものであつて、鋼矢板１０の片面にプラスチ
ツクス例えばポリエチレンの重防食被覆１１が接
着剤層を介して一体に設けられて防食鋼矢板１２
が構成され、多数の防食鋼矢板１２を噛み合わせ
連結してなる複数の防食鋼矢板壁１３，１４が、
間隔をおいて平行に配置されると共に、防食被覆
１１が外側に位置するように配置されて、水底地
盤２に打設され、各防食鋼矢板壁１３，１４の内
側の上部には腹起し材１５が配置され、かつ各腹
起し材１５および各防食鋼矢板壁１３，１４にわ
たつてタイロツド１６が挿通され、さらに防食鋼
矢板壁１３，１４におけるタイロツド貫通部の周
囲の防食被覆は剥離除去され、その防食被覆剥離
によつて生じた鋼矢板露光外面に、座金１７が当
接されてビスまたは溶接等により固定され、タイ
ロツド１５の両端部に螺合されたナツト１８が前
記座金１７に直接または間接的に係合される。 5 to 7 show a second embodiment of the present invention, in which a heavy anti-corrosion coating 11 made of plastic, for example polyethylene, is integrally provided on one side of a steel sheet pile 10 via an adhesive layer to prevent corrosion. Steel sheet pile 12
A plurality of anti-corrosion steel sheet pile walls 13 and 14 are formed by interlocking and connecting a large number of anti-corrosion steel sheet piles 12,
They are placed parallel to each other at intervals, and are placed so that the anti-corrosion coating 11 is located on the outside, and are cast into the underwater ground 2, and the inner upper part of each anti-corrosion steel sheet pile wall 13, 14 is provided with an upright. The tie rods 16 are inserted through each of the uprights 15 and the anti-corrosion steel sheet pile walls 13 and 14, and the anti-corrosion coating around the tie rod penetration portion in the anti-corrosion steel sheet pile walls 13 and 14 is peeled off. A washer 17 is brought into contact with the exposed outer surface of the steel sheet pile caused by the peeling off of the anti-corrosion coating and fixed by screws or welding, and nuts 18 screwed onto both ends of the tie rod 15 are attached to the washer 17. engaged directly or indirectly.
次に第１実施例の場合と同様に、鋼矢板の露出
外面が清浄処理されたのち、約40℃に加熱されて
から、その露出外面にクロム酸化合物とコロイダ
ルシリカを含有する水溶性処理液が塗布され、次
いで必要であれば、ビスフエノール−Ａタイプが
脂環タイプエポキシ樹脂プライマーが塗布され
る。 Next, as in the case of the first embodiment, the exposed outer surface of the steel sheet pile is cleaned and heated to about 40°C, and then a water-soluble treatment solution containing a chromic acid compound and colloidal silica is applied to the exposed outer surface. is applied, and then, if necessary, a bisphenol-A type cycloaliphatic type epoxy resin primer is applied.
次にガスバーナーで前記露出外面が100〜200℃
に加熱されてからポリエチレンの粉末が溶射ガン
で溶射されて、第８図に示すように、前記露出外
面にポリエチレンの防食被覆１９が一体に形成さ
れる。 Next, heat the exposed outer surface to 100-200℃ using a gas burner.
After heating, polyethylene powder is sprayed with a thermal spray gun to integrally form a polyethylene anti-corrosion coating 19 on the exposed outer surface, as shown in FIG.
なお各防食鋼矢板壁１３，１４の間には土砂
（図示を省略した）が充填され、かつ各防食鋼矢
板壁１３，１４の上端部にはコンクリートのコー
ピング２０が施上される。 The space between each of the anti-corrosion steel sheet pile walls 13 and 14 is filled with earth and sand (not shown), and a concrete coping 20 is applied to the upper end of each of the anti-corrosion steel sheet pile walls 13 and 14.
接合部の防食被覆８，１９を構成するプラスチ
ツクとしてポリエチレンを使用する場合、そのポ
リエチレンとして、低密度ポリエチレンまたは中
密度ポリエチレンの何れを使用してもよく、ある
いはそれらと酢酸ビニル、アクリルメタクリル
酸、エステルアクリル酸、無水マレイン酸または
プロピレン、１−ブテン、１−ヘキセン、ブタジ
エンなどとの共重合体を使用してもよい。また環
境応力亀裂破壊や紫外線劣化に対する抵抗や鋼材
との接着力を増すためには、ホモポリマーよりも
共重合体のポリエチレンの方が望ましい。さらに
ポリエチレン以外にもポリプロピレン、ポリ塩化
ビニルなどの熱可塑性樹脂でもよく、それらは単
独または２種類以上の混合物として用いてもよ
い。 When polyethylene is used as the plastic constituting the anticorrosive coatings 8 and 19 of the joints, either low-density polyethylene or medium-density polyethylene may be used, or they may be combined with vinyl acetate, acrylic methacrylic acid, or ester. Acrylic acid, maleic anhydride or copolymers with propylene, 1-butene, 1-hexene, butadiene, etc. may also be used. Furthermore, copolymer polyethylene is preferable to homopolymer in order to increase resistance to environmental stress cracking, UV degradation, and adhesion to steel materials. Furthermore, in addition to polyethylene, thermoplastic resins such as polypropylene and polyvinyl chloride may be used, and these may be used alone or as a mixture of two or more types.
これらの熱可塑性樹脂は前述のようなクロム酸
化合物からなるプライマーを用いることなく、予
熱した鋼材に直接、溶射で被覆することが可能で
あるが、プラスチツクス層の単独被覆では接着力
の耐久性が劣る。例えばプラスチツクス層の単独
被覆を施した鋼材の試験片の中央に鋼材表面まで
達する疵をナイフで入れてから塩水に１週間浸漬
すると、完全にプラスチツクス層が剥離してしま
うが、クロム酸化合物のプライマーを予め塗布し
ておくと、１カ月経過しても全く接着力の抵下は
認められない。従つて、40年以上の長期耐久性が
要求される海洋構造物用鋼管矢板の防食被覆とし
ては、このようなプライマーを塗布することは極
めて重要である。 These thermoplastic resins can be coated directly onto preheated steel by thermal spraying without using a primer made of a chromic acid compound as mentioned above, but the durability of the adhesive strength is limited when coating the plastic layer alone. is inferior. For example, if a steel specimen coated with a single plastic layer is made with a knife and a flaw reaching the steel surface is made in the center and then immersed in salt water for a week, the plastic layer will completely peel off, but the chromic acid compound If the primer is applied in advance, no decrease in adhesive strength will be observed even after one month has passed. Therefore, it is extremely important to apply such a primer as an anticorrosion coating for steel pipe sheet piles for offshore structures, which require long-term durability of 40 years or more.
またポリエチレンには、溶射ガンの火炎で加熱
され溶融するときに熱分解しないようにフエノー
ル化合物、アミン化合物、含硫化合物、亜リン酸
化合物などの耐熱老化剤を1000〜5000ppm、望
ましくは3000ppm以上添加することが必要であ
る。ポリエチレンは高温にさらされると熱分解に
よつて分子鎖が切断され、耐環境応力亀裂破壊性
などの性能が低下するので、長期耐久性が必要な
防食被覆としは好ましくない。通常の押出被覆が
射出成形に用いられるポリエチレンにも耐熱老化
剤は添加されているが、その場合には1000ppm
前後も添加すれば充分効果はあるが、溶射用のポ
リエチレンにはもつと多量に添加しなければなら
ない。また紫外線による劣化を防止するために、
ベンゾフエノン誘導体、サリチル酸エステル、ベ
ンゾトリアゾール誘導体などの光安定剤やカーボ
ンブラツクを添加する。特にカーボンブラツクは
効果的で2.0ないし3.0％望ましくは2.4から2.6％
添加すれば、紫外線による劣化をほぼ完全に防止
することができる。しかし、カーボンブラツクの
添加量が多過ぎると鋼材との接着力が低下するの
で、カーボンブラツクの添加量は0.5ないし1.0％
の範囲で用いられるのが好ましい。 In addition, heat-resistant aging agents such as phenol compounds, amine compounds, sulfur-containing compounds, and phosphorous compounds are added to polyethylene at 1000 to 5000 ppm, preferably at least 3000 ppm, to prevent thermal decomposition when it is heated and melted by the flame of a thermal spray gun. It is necessary to. When polyethylene is exposed to high temperatures, its molecular chains are severed due to thermal decomposition, and its performance, such as resistance to environmental stress cracking and rupture, deteriorates, so it is not preferred as an anticorrosion coating that requires long-term durability. Heat aging agents are also added to polyethylene, which is normally extruded and used for injection molding, but in that case, 1000ppm
It is sufficiently effective if added before and after, but a large amount must be added to polyethylene for thermal spraying. In addition, to prevent deterioration due to ultraviolet rays,
Light stabilizers such as benzophenone derivatives, salicylic acid esters, benzotriazole derivatives, and carbon black are added. Especially carbon black is effective, 2.0 to 3.0% preferably 2.4 to 2.6%.
By adding it, deterioration caused by ultraviolet rays can be almost completely prevented. However, if the amount of carbon black added is too large, the adhesive strength with the steel material will decrease, so the amount of carbon black added is 0.5 to 1.0%.
It is preferable to use the range of .
この場合は、紫外線劣化に対する抵抗力は低下
する。そこでその解決法として考えられる方法と
して二つある。その一つの方法は、鋼材に近い側
にまずカーボンブラツク無添加のポリエチレンを
溶射し、その外側にカーボンブラツクを2.4ない
し2.6％添加したポリエチレンを溶射する方法
で、いわゆる２層被覆である。ポリエチレン全体
の厚さを2.5mm以上とする場合、下層の0.05ない
し1.0mmをカーボンブラツク無添加のポリエチレ
ンとし、残りはカーボンブラツク添加のポリエチ
レンとする。この場合にも、もちろんクロム酸化
合物のプライマーを用いてもよい。 In this case, resistance to ultraviolet deterioration is reduced. There are two possible solutions to this problem. One method is to spray polyethylene without carbon black on the side closest to the steel material, and then spray polyethylene containing 2.4 to 2.6% carbon black on the outside, which is a so-called two-layer coating. When the total thickness of the polyethylene is 2.5 mm or more, the lower layer of 0.05 to 1.0 mm is made of polyethylene without carbon black added, and the rest is made of polyethylene added with carbon black. In this case, of course, a chromic acid compound primer may also be used.
他の一つの方法は、クロム酸化合物のプライマ
ーを塗布した上に、ポリエチレン１ｇ中に無水マ
レイン酸基を0.8×10-4ｇから3.0×10-4ｇ含有す
る変性ポリエチレンを被覆する方法である。この
方法であれば全体にカーボンブラツクが2.4ない
し2.6％添加されているものであつても接着力は
殆んど低下しない。このようなポリエチレンを使
用して溶射被覆する場合は、エポキシ樹脂プライ
マーは海水による接着力の低下を防止する効果を
持つだけでなく、初期の接着力を向上する効果も
持ち、溶射による防食被覆の形成には極めて重要
である。 Another method is to coat a chromic acid compound primer with modified polyethylene containing 0.8 x 10 -4 g to 3.0 x 10 -4 g of maleic anhydride groups per gram of polyethylene. . If this method is used, the adhesive strength will hardly decrease even if 2.4 to 2.6% carbon black is added to the entire product. When applying thermal spray coating using such polyethylene, the epoxy resin primer not only has the effect of preventing the adhesive strength from decreasing due to seawater, but also has the effect of improving the initial adhesive strength, making it possible to apply the anti-corrosion coating by thermal spraying. It is extremely important for formation.
次にポリエチレンのメルト・インデツクスは
0.1ｇ／10minから20ｇ／10minまでの範囲で望ま
しくは1.5ｇ／10minから6.0ｇ／10minの範囲で
ある。メルト・インデツクスが小さ過ぎると溶融
時の粘度が大きいためにポリエチレンの流動性が
悪く、溶射して形成したポリエチレン被覆の表面
が平滑になりにくく、またピンホールを生じ易
い。一方、メルト・インデツクスが大き過ぎるポ
リエチレンは分子量の大きさが小さいために耐環
境応力亀裂性や機械的強度が低くなり、長期耐久
性を要求される防食材料としては好ましくない。 Next, the melt index of polyethylene is
The range is from 0.1 g/10 min to 20 g/10 min, preferably from 1.5 g/10 min to 6.0 g/10 min. If the melt index is too small, the polyethylene has poor fluidity due to its high viscosity when melted, making it difficult for the surface of the polyethylene coating formed by thermal spraying to be smooth, and pinholes are likely to occur. On the other hand, polyethylene with an excessively large melt index has a low molecular weight, resulting in low environmental stress cracking resistance and mechanical strength, and is therefore undesirable as an anticorrosive material that requires long-term durability.
また、ポリエチレンの粒度は20メツシユないし
150メツシユ、望ましくは50メツシユないし70メ
ツシユの範囲がよい。粒度が小さ過ぎると、溶射
ガンから噴射するときの飛散が多く、塗布効率が
低くなるのでコストアツプになるし、火炎にさら
される粉末の表面積が大きくなるためポリエチレ
ンは熱劣化し易く、品質的に好ましくない。 In addition, the particle size of polyethylene is 20 mesh or
The range is 150 meshes, preferably 50 meshes to 70 meshes. If the particle size is too small, there will be a lot of scattering when spraying from a thermal spray gun, which will reduce coating efficiency and increase costs.Also, since the surface area of the powder exposed to flame will increase, polyethylene will easily deteriorate due to heat, which is preferable in terms of quality. do not have.
一方、粒子が大き過ぎると、塗布効率は良くな
るし、塗装速度も大きくなるが、粉末の溶融が不
十分になり易く、その結果、被覆の表面が平滑に
なりにくい傾向がある。またポリエチレン以外の
プラスチツクスについても全く同様のことがいえ
る。 On the other hand, if the particles are too large, the coating efficiency is improved and the coating speed is increased, but the powder tends to be insufficiently melted, and as a result, the surface of the coating tends to be difficult to obtain. The same thing can also be said about plastics other than polyethylene.
接合部付近の防食被覆８，１９を形成した後
は、自然冷却してもよく、あるいは水冷してもよ
い。 After forming the anti-corrosion coatings 8, 19 near the joints, natural cooling or water cooling may be performed.
この発明によれば、プラスチツクス防食被覆を
有する鋼製部材の接合予定部付近の防食被覆を剥
離除去して、その鋼製部材を接合し、次に鋼製部
材の接合部付近の露出表面に、プラスチツクスの
粉末の溶射によりプラスチツクスの防食被覆を形
成するので、防食被覆鋼製部材を接合して構成し
た防食被覆鋼製構造物における鋼製部材接合部付
近にも容易にプラスチツク防食被覆を施して、鋼
製部材およびそれらの接合部にわたつて連続して
プラスチツク防食被覆が施されている防食被覆鋼
製構造物を容易に得ることができ、また鋼製部材
の接合部付近の露出表面に、予めクロム酸化合物
からなるプライマー層を形成したのち、プラスチ
ツクスの粉末の溶射によりプラスチツクの防食被
覆を形成するので、極めてすぐれた耐衝撃性およ
び自然還境に対する耐久性を有し、したがつて、
港湾、河川等に建造される鋼製構造物の防食被覆
として長期間にわたつて高い水準の防食性能を発
揮させることができる等の効果が得られる。 According to this invention, the anti-corrosion coating of a steel member having a plastic anti-corrosion coating is peeled off and removed from the vicinity of the part to be joined, the steel members are joined, and then the exposed surface of the steel member near the joint part is peeled off and removed. Since the plastic anti-corrosion coating is formed by thermal spraying of plastic powder, it is easy to apply the plastic anti-corrosion coating near the joints of steel members in a structure made of anti-corrosion coated steel made by joining anti-corrosion coated steel members. It is possible to easily obtain a corrosion-resistant coated steel structure in which the plastic anti-corrosion coating is applied continuously over the steel members and their joints, and also to protect the exposed surfaces near the joints of the steel members. After forming a primer layer made of a chromic acid compound in advance, a plastic anti-corrosion coating is formed by spraying plastic powder, so it has extremely excellent impact resistance and durability against natural environmental degradation. Then,
As an anti-corrosion coating for steel structures built in ports, rivers, etc., it can provide effects such as being able to exhibit a high level of anti-corrosion performance over a long period of time.
第１図ないし第４図はこの発明の第１実施例を
示すものであつて、第１図は防食鋼管杭を水底地
盤に打設した状態を示す側面図、第２図は鋼管杭
に鋼製連結部材を溶接により接合した状態を示す
側面図、第３図はこの発明の接合部防食施工を施
した防食被覆鋼製構造物の斜視図、第４図はその
構造物における部材接合部付近を拡大して示す斜
視図である。第５図ないし第８図はこの発明の第
２実施例を示すものであつて、第５図は複数の防
食鋼矢板壁を打設してタイロツドにより連結した
状態を示す概略側面図、第６図はその一部を示す
拡大斜視図、第７図はタイロツドによる連結部を
示す拡大縦断側面図、第８図は座金の周囲の防食
被覆剥離部分に防食被覆を施した状態を示す縦断
側面図である。
図において、１はプラスチツク、３は鋼管杭、
４は重防食被覆、５は鋼製連結部材、６は重防食
被覆、７は防食鋼製連結部材、８は防食被覆、１
０は鋼矢板、１１は重防食被覆、１２は防食鋼矢
板、１３および１４は防食鋼矢板壁、１５は腹起
し材、１６はタイロツド、１７は座金、１８はナ
ツト、１９は防食被覆である。
1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a side view showing a state in which a corrosion-resistant steel pipe pile is driven into the underwater ground, and FIG. FIG. 3 is a perspective view of a corrosion-resistant coated steel structure that has been subjected to joint anti-corrosion treatment according to the present invention, and FIG. 4 is a view showing the vicinity of the member joint in the structure. It is a perspective view which expands and shows. 5 to 8 show a second embodiment of the present invention, in which FIG. 5 is a schematic side view showing a state in which a plurality of anti-corrosion steel sheet pile walls are driven and connected by tie rods, and FIG. The figure is an enlarged perspective view showing a part of the structure, FIG. 7 is an enlarged longitudinal side view showing the connecting part by the tie rod, and FIG. 8 is a longitudinal side view showing the state where the anticorrosive coating has been applied to the part where the anticorrosive coating has been peeled off around the washer. It is. In the figure, 1 is plastic, 3 is steel pipe pile,
4 is a heavy anti-corrosion coating, 5 is a steel connecting member, 6 is a heavy anti-corrosion coating, 7 is an anti-corrosion steel connecting member, 8 is an anti-corrosion coating, 1
0 is a steel sheet pile, 11 is a heavy anti-corrosion coating, 12 is an anti-corrosion steel sheet pile, 13 and 14 are anti-corrosion steel sheet pile walls, 15 is a raised material, 16 is a tie rod, 17 is a washer, 18 is a nut, and 19 is an anti-corrosion coating. be.
Claims (1)
接合予定部付近の防食被覆を剥離除去して、その
鋼製部材を接合し、次に鋼製部材の接合部付近の
露出表面に、クロム酸化合物からなるプライマー
層を形成したのち、プラスチツクスの粉末の溶射
によりプラスチツクスの防食被覆を形成すること
を特徴とする防食被覆鋼製構造物の接合部防食施
工法。1 Peel and remove the anti-corrosion coating near the joint area of a steel member with a plastic anti-corrosion coating, join the steel member, and then apply a coating of chromic acid compound to the exposed surface of the steel member near the joint area. 1. A corrosion-proofing construction method for joints of a steel structure with an anti-corrosion coating, characterized in that after forming a primer layer, a plastic anti-corrosion coating is formed by spraying plastic powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14803083A JPS6041574A (en) | 1983-08-15 | 1983-08-15 | Execution method of corrosion-proof processing of joint of steel construction with corrosion-proof coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14803083A JPS6041574A (en) | 1983-08-15 | 1983-08-15 | Execution method of corrosion-proof processing of joint of steel construction with corrosion-proof coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6041574A JPS6041574A (en) | 1985-03-05 |
| JPS6214352B2 true JPS6214352B2 (en) | 1987-04-01 |
Family
ID=15443541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14803083A Granted JPS6041574A (en) | 1983-08-15 | 1983-08-15 | Execution method of corrosion-proof processing of joint of steel construction with corrosion-proof coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6041574A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006102738A (en) * | 2004-09-08 | 2006-04-20 | Hiroyuki Suzuki | Method for maintaining steel structure preventively |
| JP5205188B2 (en) * | 2008-09-12 | 2013-06-05 | 東京製綱株式会社 | Multilayer resin spraying method and multilayer resin sprayed metal structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5028444A (en) * | 1973-07-07 | 1975-03-24 | ||
| JPS5240543A (en) * | 1975-09-29 | 1977-03-29 | Nippon Steel Corp | Method for covering metal goods with polyolefine |
| JPS5377324A (en) * | 1976-12-21 | 1978-07-08 | Nippon Steel Corp | Double coated steel pipe and manufacturing method for it |
| JPS57113871A (en) * | 1980-12-29 | 1982-07-15 | Sumitomo Metal Ind Ltd | Production of corrosion preventive coated metallic pipe |
-
1983
- 1983-08-15 JP JP14803083A patent/JPS6041574A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5028444A (en) * | 1973-07-07 | 1975-03-24 | ||
| JPS5240543A (en) * | 1975-09-29 | 1977-03-29 | Nippon Steel Corp | Method for covering metal goods with polyolefine |
| JPS5377324A (en) * | 1976-12-21 | 1978-07-08 | Nippon Steel Corp | Double coated steel pipe and manufacturing method for it |
| JPS57113871A (en) * | 1980-12-29 | 1982-07-15 | Sumitomo Metal Ind Ltd | Production of corrosion preventive coated metallic pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6041574A (en) | 1985-03-05 |
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