KR0157690B1 - Anticorrosion method for bridge - Google Patents
Anticorrosion method for bridgeInfo
- Publication number
- KR0157690B1 KR0157690B1 KR1019950002522A KR19950002522A KR0157690B1 KR 0157690 B1 KR0157690 B1 KR 0157690B1 KR 1019950002522 A KR1019950002522 A KR 1019950002522A KR 19950002522 A KR19950002522 A KR 19950002522A KR 0157690 B1 KR0157690 B1 KR 0157690B1
- Authority
- KR
- South Korea
- Prior art keywords
- bridge
- corrosion
- coated
- spray
- surface layer
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 18
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 239000002344 surface layer Substances 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims abstract description 8
- 238000005422 blasting Methods 0.000 claims abstract description 5
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 5
- 239000004593 Epoxy Substances 0.000 claims abstract description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 3
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 3
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 7
- 238000005536 corrosion prevention Methods 0.000 claims description 3
- QKKCMWPOASMDQR-UHFFFAOYSA-J molybdenum(4+);tetraiodide Chemical compound I[Mo](I)(I)I QKKCMWPOASMDQR-UHFFFAOYSA-J 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 27
- 230000007797 corrosion Effects 0.000 abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 7
- 239000010410 layer Substances 0.000 abstract description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 3
- 239000011733 molybdenum Substances 0.000 abstract description 3
- 230000008929 regeneration Effects 0.000 abstract 1
- 238000011069 regeneration method Methods 0.000 abstract 1
- 239000003570 air Substances 0.000 description 6
- 230000001050 lubricating effect Effects 0.000 description 6
- 239000004519 grease Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000010349 cathodic reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000010416 ion conductor Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
- E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
본 발명은 교량의 구조물을 구성하는 빔, 상판, 하판, 교각, 슈베어링(Shoe-Bearing)을 구성한 교좌장치, 난간등의 외부표면에 발청하는 녹면층을 효과적으로 제거하여 교량의 각 구조물에 녹면층이 재발생되지 않도록 하기 위한 교량의 부식방지를 위해 교량의 구성하는 모든 철구조물 표면에 발청한 녹면층을 4℃이하의 냉각 건조공기로 브라스팅 행하여 제거하고, 상기에서 녹면층이 제거된 모든 철구조물의 표면에 다시 1차로 Zn, 2차로 Al으로 분사코팅하여 상기에서 Zn과 Al이 코팅된 교좌장치의 표면에는 윤활성 유지를 위하여 Mo으로 프레임 스프레이로 코팅한 표면상에 이유화몰리브덴유로 재 코팅한 후에 상기한 모든 철구조물상에 통상의 에폭시 또는 비닐계 도장을 취하는 것에 그 특징이 있다.The present invention effectively removes the green surface layer rusted on the outer surface of the beam, the upper plate, the lower plate, the pier, the bridge device consisting of shoe-bearing, the railing, etc. constituting the structure of the bridge rust on each structure of the bridge In order to prevent corrosion of the bridge to prevent regeneration of the surface layer, all the steel layers constituting the bridges are removed by blasting with cold dry air below 4 ° C. The surface of the structure was first spray-coated with Zn and Al secondly, and the surface of the Zn and Al-coated seating device was recoated with molybdenum weanized oil on the surface coated with Mo with a frame spray to maintain lubricity. It is later characterized by the usual epoxy or vinyl coatings on all the above described iron structures.
Description
본 발명은 교량의 구조물을 구성하는 빔, 상판, 하판, 교각, 슈베어링(Shoe-Bearing)을 구성한 교좌장치, 난간등의 모든 철구조물 외부표면에 발청하는 녹면층을 효과적으로 제거하여 교량의 각 구조물에 녹면층이 재발생되지 않도록 하기 위한 교량의 부식방지 방법에 관한 것이다.The present invention effectively removes the green surface layer which is rusted on the outer surface of all steel structures such as beam, top plate, bottom plate, pier, bridge device constituting shoe-bearing, railing, etc. The present invention relates to a method for preventing corrosion of a bridge to prevent re-occurrence of a molten layer in a structure.
일반적으로 철구조물로 건설되는 교량의 부식은 주로 금속이 용해되어 수용액상의 금속이온이 되는 양극반응(Anodic Reaction)의 생성과 양극반응에서 생성된 전자를 소모하는 음극반응(Cathodic Reaction)의 생성 및 전자전도체와 이온전도체의 접속에 의하여 이루어지고 있다.In general, the corrosion of bridges constructed of steel structures is mainly due to the formation of an anodic reaction in which the metal is dissolved to form a metal ion in an aqueous solution, and a cathodic reaction and electrons that consume the electrons generated in the anodic reaction. The connection is made between a conductor and an ion conductor.
다시말해 교량의 부식은 산화화합물질등으로 인한 화학반응으로 생성되는 부식과 전류의 흐름으로 인해 유도되는 전위차발생으로 생성되는 전위부식 등으로 이루어지게 되는 것이다.In other words, the corrosion of bridges consists of corrosion generated by chemical reactions due to oxidizing compounds and potential corrosion caused by potential difference induced by current flow.
이에따라 교량의 교과장치를 비롯하여 비임등 구조물, 상판, 하판, 난간 등의 철구조물은 특히 수면위에 놓이게 됨으로서 물, 공기로 인한 부식 뿐만 아니라 차량의 매연으로 인한 아황산가스에 의한 산기성부식과 염화칼슘등에 의한 염기성부식 및 고압전류에서 유도되는 유도전류에 의한 전원부식등 여러가지 요소등에 의하여 복합적으로 작용하여 부식시키고 있다.As a result, bridge structures, beam structures, top plates, bottom plates, railings, etc. are placed on the surface of the water. Corrosion is caused by various factors such as basic corrosion and power supply corrosion caused by induced current induced by high voltage current.
이러한 문제점을 극복하기 위하여 종래에는 교량의 각 철구조물에 페인트에 의한 도장방법에 의하였으나 페인트의 지속성 한계 때문에 철의 부식을 장기간 막을수 없어 2~3년에 한번씩 새로이 도장해야하는 단점 및 페인트는 외부접촉에 의해 발생하는 물리적인 충격에 의해 스크래치가 발생하고, 자외선에 의한 물성변화 및 철과 페인트간의 열팽창 차이에서 오는 크랙(Crack), 산성비등 산성화 환경에서 오는 물성변화 뿐만아니라 특히 유기성 페인트는 액체환경에서 0.1~3%의 수분을 흡수하는 단점 때문에 전기 삼투압부식이 전이되는 또다른 단점이 있었다. 이러한 단점은 상기한 바와같이 교량의 구조물 뿐만아니라 교좌장치의 부식에 의한 윤활면의 윤활기능 마비와 함께 신축이음장치 본체에 까지 미치게 되어 교량의 수명을 단축시킬수 밖에 없었다.In order to overcome this problem, conventionally, the iron structure of the bridge is applied by painting method. However, due to the limitation of the sustainability of the paint, the corrosion of iron cannot be prevented for a long time. Scratch occurs by the physical impact caused by the physical impact, and not only the change in the physical properties caused by ultraviolet rays and the difference in thermal expansion between iron and paint. There was another drawback of the electroosmotic corrosion transfer due to the drawback of absorbing 3% moisture. This drawback extends to the expansion joint body as well as the structure of the bridge as well as the lubrication function of the lubricating surface due to the corrosion of the bridge device, which inevitably shortens the life of the bridge.
이러한 문제점을 나름대로 해결하고자 하여 특히 교좌장치의 녹면층을 제청하고자 하는 방법이 1988. 2. 29자로 특허 출원 제88-2141호(공고번호 90-8486)로 제공하고 있다.In order to solve this problem in accordance with the method, in particular, a method for enlarging the green surface layer of the teaching apparatus is provided as a patent application No. 88-2141 (notice number 90-8486) as of February 29, 1988.
위의 종래의 특허는 교좌장치의 외부표면에 발청하는 녹면층을 80℃온도의 공기를 이용하여 기 발청한 녹면층을 타격박리하고, 슈(Shoe)작동부위에 실리콘구리스를 주입시킨 다음에 에폭시 수지제의 도료로 도장하는 방법을 제공하고 있다.The above conventional patent blows and peels off the rusted green layer which is applied to the outer surface of the chair by using the air at 80 ° C, and injects silicon grease into the shoe operating part. There is provided a method of coating with a coating made of epoxy resin.
그러나 이러한 종래의 방법은 녹면층을 타격박리하기 위해 80℃의 온도를 가진 가열공기에 의하므로 이러한 고온의 온도는 특히 겨울의 경우에는 주변의 대기온도 보다 극히 높기 때문에 교좌장치를 구성하는 철구조물등에 접촉하면서 급격한 온도장치에 의해 수분이 발생하기 때문에 그 다음 공정인 실리콘구리스가 교좌장치에 쉽게 접착되지 아니하고 탈지되므로 수분의 제거가 완전히 이루어진 후에나 가능하여 장시간의 작업시간을 요하게 되고, 또한 수분이 있는 상태에서 에폭시 수지제로 도장하게 되면 수분이 갇히게 되므로 오히려 부식을 일이키는 단점이 있고, 또한 이러한 수분에 의한 습기는 슈에 주입된 실리콘구리스의 물성을 변하게 하고, 슈에 설치되는 고무패킹을 변질케하는 단점이 있다.However, since the conventional method is based on heated air having a temperature of 80 ° C. to blow off the rust layer, such high temperature is extremely higher than the ambient air temperature, especially in winter, so that the steel structure constituting the stabilization device is used. As the moisture is generated by the rapid temperature device during contact, the next process, silicon grease, is not easily adhered to the chair device and is degreased. Therefore, it is possible only after the removal of water is completed, which requires a long working time. In the case of coating with epoxy resin, moisture is trapped, which leads to corrosion. In addition, moisture caused by this moisture changes the physical properties of silicone grease injected into the shoe and alters the rubber packing installed on the shoe. There are disadvantages.
본 발명은 이러한 종래의 문제점을 근본적으로 치유하기 위하여 창출된 것으로써, 교량을 구성하는 교좌장치 뿐만아니라 빔, 상판, 하판, 교각, 난간 등의 철구조물에 기 발생된 녹면층을 효과적으로 제거하여 녹면층이 재발생하지 않도록 효과적으로 처리함으로써 교량의 노화를 방지하여 교량의 수명을 연장하고자 하는데 그 목적이 있다.The present invention was created to fundamentally heal such a conventional problem, and effectively removes the green surface layer generated in the steel structures such as beams, top plates, bottom plates, piers, railings, as well as the bridge devices constituting the bridge. The purpose is to extend the life of the bridge by preventing the aging of the bridge by effectively treating the surface layer does not regenerate.
본 발명은 이러한 목적을 달성하기 위하여 아래와 같은 공정을 취하게 된다.The present invention takes the following steps to achieve this object.
공기를 이용하여 기 발생된 녹면층으로 제거하되 6kg/㎠이상의 고압공기를 4℃ 이하로 냉각시켜 습기를 완전히 제거한 상태의 공기로 브라스팅을 취하므로써 특히 겨울철에 작업을 행하여도 수분이 발생되지 않도록 하여 교좌장치이 윤활면의 윤활성 물질에 전혀 영향이 없도록 하는 브라스팅공정을 취하고, 상기한 브라스팅공정을 취하여 녹면층을 제거한 후에는 부식방지를 위하여 상기와 같이 브라스트된 철구조물의 표면상에 Zn을 스프레이(Spray)분사방식에 의하여 코팅한 후 다시 Al을 스프레이(Spray)분사방식에 의하여 코팅을 취하여 준다.Remove the rust layer by using air, but use high pressure air of more than 6kg / ㎠ to cool down to 4 ℃ and blast it with air completely dehumidified, so that no moisture is generated even when working in winter. Take a blasting process so that the teaching device has no influence on the lubricating material of the lubricating surface, and after the blasting process is removed to remove the rusted surface layer, the surface of the blasted steel structure as described above is prevented to prevent corrosion. After Zn is coated by spray spraying method, Al is again coated by spray spraying method.
이러한 본 부식방지를 위한 공정에서는 특히 상기한 Zn은 뛰어난 접착력과 전위차로 인한 양극부식을 자기 희생으로 막아주게 되므로 양극반응에 의한 부식을 방지하게 되고, 2차로 스프레이분사로 코팅되는 Al은 아황산등 산성부식에 내식성이 강하고 특히 염분등에 의한 염기성부식에 내식성이 강한 효과를 구득할 수 있게 된다.In the process for preventing this corrosion, in particular, the above Zn prevents anode corrosion due to excellent adhesion and potential difference by self-sacrifice, thereby preventing corrosion by anode reaction, and Al coated by spray spraying in secondary is acidic, such as sulfurous acid. It is possible to obtain the effect of corrosion resistance strong to corrosion and strong corrosion resistance to basic corrosion caused by salt and the like.
특히 본 부식방지는 교량을 구성하는 모든 철구조물 등에 효과적으로 이용될 수 있으며, 자동차의 배기가스 산성비 등에 내식성이 있게 됨은 상기한 이유에 의하여 뛰어난 방청 및 방식의 효과를 얻을수 있게 된다.In particular, the anti-corrosion can be effectively used for all the steel structures constituting the bridge, etc., and the corrosion resistance to the exhaust gas acid rain of the car can be obtained the effect of excellent anti-rust and anticorrosion for the above reason.
이러한 상기의 부식방지공정을 취한 후에는 특히 교좌장치등의 윤활면의 윤활성유지를 위하여 윤활면 보존공정을 취하게 되는데, 이때에는 상기한 바와같이 Zn과 Al에 의하 2중의 스프레이 분사에 의한 코팅이 완전히 이루어진 표면상에 접착력이 지극히 강하고 높은 경도를 가진 No을 프레임 스프레이(Frame Spray)방법으로 코팅하여 그 위에 다시 이유화몰리브덴유를 코팅하여 줌으로써 반영적인 윤활성을 보유할 수 있게 된다.After the above corrosion prevention process is carried out, especially in order to maintain the lubricity of the lubricating surface of the chair, etc., the lubricating surface preservation process is performed. In this case, as described above, the coating by double spray spraying by Zn and Al is applied. It is possible to retain reflective lubricity by coating No. which has an extremely strong adhesive strength and a high hardness on a completely made surface by applying a frame spray method, and coating molybdenum weanized oil on it again.
이러한 것은 Mo은 자체윤활성이 있기 때문에 교좌장치의 슈(Shoe)는 슬라이드 작동이 필요하므로 특히 슈에 유리하고 또한 내식성과 접착력이 강하고 RC40에 이르는 높은 경도에 의해 훌륭한 내마모성 및 윤활성을 구득할 수 있게 된다.This is because Mo is self-lubricating, so the shoe of the chair requires slide operation, which is particularly advantageous for the shoe, and has excellent corrosion resistance and adhesion and high hardness up to RC40, thereby providing excellent wear resistance and lubricity. .
물론 종래에는 상기와 같이 교좌장치의 슈 윤활면에 실리콘 구리스를 주입하거나 스텐레스판을 부착했으나, 특히 실리콘 구리스는 시간이 경과할 때마다 그 성능이 저하되고 교량의 상판에서 흘러내리는 수분, 연화칼슐, 먼지 등의 퇴적물이 쌓여 윤활면에 부식이 발생하는 단점을 배제할 수 없었다.Of course, in the past, silicon grease was injected or a stainless steel plate was attached to the shoe lubrication surface of the bridge device as described above, but in particular, silicon grease deteriorated with time and water, softening capsules, It was not possible to rule out the disadvantage that the deposits, such as dust, accumulate and cause corrosion on the lubricating surface.
이러한 윤활면 보존공정이 이루어진 후에는 시일링공정을 취하여야 하는 데, 이는 상기한 부식방지 공정을 취한 표면상에 핀홀을 막아주기 위하여 투명 또는 전체교각의 배색을 위한 도장을 취하면 될 것이다.After the lubrication surface preservation process is performed, a sealing process should be taken, which may be applied for the coloration of the transparent or whole piers to prevent pinholes on the surface of the above-mentioned corrosion prevention process.
통상 이용되는 도료는 유색의 에폭시 또는 비닐계의 도장을 취하여 외관을 미려하게 하면 될 것이다.The paint normally used may be colored epoxy or vinyl-based coating to enhance the appearance.
이상 상기한 바와같은 본 발명은 4℃이하로 냉각건조 공기로써 통상의 압(壓)으로 브라스팅공정을 취하여 기 발청된 녹면층을 제거하고, 제거된 녹면층의 모든 철구조물을 구성하는 교좌장치, 난간등에 1차로 Zn분사 코팅을 하고난 다음 2차로 Al분사코팅을 취하여 외부의 악조건을 가진 환경으로 부터 부식방지를 취하여, 특히 윤활면 유지가 필요한 교좌장치에로 자체윤활성 및 높은 경도를 가진 Mo으로 코팅한 다음 그 위에 다시 이유화몰리브데유 코팅하여 윤활성을 반영구적으로 보존할 수 있도록 하여 교량의 부식을 근본적으로 방지할 수 있도록 하여 교량의 노화현상의 진행을 막아 주는 매우 유용한 발명임이 명백하다.As described above, the present invention takes a blasting process at a normal pressure with cooling dry air below 4 ° C. to remove the pre-rusted green surface layer, and a staircase device constituting all the iron structures of the removed green surface layer. After applying Zn spray coating on the railing firstly and Al spray coating secondly to prevent corrosion from the bad environment, especially Moe with self-lubrication and high hardness. It is obvious that it is a very useful invention that prevents the aging phenomenon of the bridge by coating with and then coated with molybdenum weaning on it so that the lubricity can be semi-permanently preserved to prevent the bridge from corrosion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950002522A KR0157690B1 (en) | 1995-02-11 | 1995-02-11 | Anticorrosion method for bridge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950002522A KR0157690B1 (en) | 1995-02-11 | 1995-02-11 | Anticorrosion method for bridge |
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| KR960032792A KR960032792A (en) | 1996-09-17 |
| KR0157690B1 true KR0157690B1 (en) | 1998-11-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321146A (en) * | 2013-07-03 | 2013-09-25 | 天津城建大学 | Replaceable anticorrosion device for bridge pier in splash zone |
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1995
- 1995-02-11 KR KR1019950002522A patent/KR0157690B1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321146A (en) * | 2013-07-03 | 2013-09-25 | 天津城建大学 | Replaceable anticorrosion device for bridge pier in splash zone |
| CN103321146B (en) * | 2013-07-03 | 2015-07-01 | 天津城建大学 | Replaceable anticorrosion device for bridge pier in splash zone |
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| Publication number | Publication date |
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| KR960032792A (en) | 1996-09-17 |
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