JP2003105574A - Galvanic anode for electrolytic protection - Google Patents
Galvanic anode for electrolytic protectionInfo
- Publication number
- JP2003105574A JP2003105574A JP2001305570A JP2001305570A JP2003105574A JP 2003105574 A JP2003105574 A JP 2003105574A JP 2001305570 A JP2001305570 A JP 2001305570A JP 2001305570 A JP2001305570 A JP 2001305570A JP 2003105574 A JP2003105574 A JP 2003105574A
- Authority
- JP
- Japan
- Prior art keywords
- galvanic anode
- anode
- galvanic
- steel material
- main body
- 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.)
- Pending
Links
Landscapes
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金属構造物の没水
部分に設置される電気防食用流電陽極の構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a galvanic anode for cathodic protection installed in a submerged portion of a metal structure.
【０００２】[0002]
【従来の技術】桟橋、護岸等の港湾施設の基礎部を構成
する鋼管杭や鋼矢板が海水や河川水等により腐食するの
を防止するためアルミニウム合金や亜鉛合金製の電気防
食用流電陽極が広く用いられている。これらの流電陽極
は従来、図４または図５に示すように流電陽極本体２と
両端に取付金具４を有する丸鋼や平板の芯金３とを一体
に鋳込んで製作される。このようにして鋳造された流電
陽極は、潜水作業員により取付金具が鋼管杭や鋼矢板に
水中溶接されて取り付けられている。2. Description of the Related Art A galvanic anode made of aluminum alloy or zinc alloy for cathodic protection in order to prevent corrosion of steel pipe piles and steel sheet piles, which form the foundation of harbor facilities such as piers and revetments, by seawater, river water, etc. Is widely used. Conventionally, these galvanic anodes are manufactured by integrally casting a galvanic anode main body 2 and a core metal 3 of a round steel or a flat plate having mounting brackets 4 at both ends, as shown in FIG. 4 or FIG. In the galvanic anode thus cast, a mounting member is mounted by being welded underwater to a steel pipe pile or a steel sheet pile by a diving worker.
【０００３】[0003]
【発明が解決しようとする課題】しかし近年、港湾施設
等の長寿命化の要請により、耐用年数が５０年以上の大
型流電陽極の取付けが要求されるようになっており、潜
水作業員が所定の位置に流電陽極を設置するのに多大な
労力が必要となってきている。However, in recent years, due to the demand for longer life of port facilities and the like, it has become necessary to install a large galvanic anode having a service life of 50 years or more. A great deal of effort has been required to install galvanic anodes in place.
【０００４】また現在、メガフロートと呼ばれている超
大型浮体鋼構造物実用化に向けての開発が進められてい
る。かかるメガフロートは水面下に広大な底面を有する
ため、その防食対策として流電陽極を底面に多数設置す
る必要があり、潜水作業者は自分の頭より高い位置に流
電陽極を掲げて設置作業を行わなければならず多大な労
力を強いられている他、頭上の流電陽極が落下して潜水
作業員が被災するおそれもある。Further, at present, development for practical use of an ultra-large floating steel structure called a megafloat is under way. Since such a megafloat has a vast bottom surface below the surface of the water, it is necessary to install a large number of galvanic anodes on the bottom surface as a countermeasure against corrosion. In addition to the large amount of work that must be done, the overhead galvanic anode may fall and the diving worker may be damaged.
【０００５】[0005]
【課題を解決するための手段】上記した従来技術の課題
を解決するためには、水の浮力を利用することにより水
中に浸漬した流電陽極の質量を軽くすればよく、そのた
めには流電陽極本体の内部に中空部を設けまたは流電陽
極本体の外部に中空体を取付ければよい。本第一発明は
かかる知見に基づくものであり、流電陽極本体と中空密
閉鋼材とが一体構成された電気防食用流電陽極体に特徴
を有するものである。In order to solve the above-mentioned problems of the prior art, it is sufficient to reduce the mass of the galvanic anode immersed in water by utilizing the buoyancy of water. A hollow portion may be provided inside the anode body or a hollow body may be attached outside the galvanic anode body. The first invention of the present invention is based on such knowledge, and is characterized by a galvanic anode body for galvanic protection in which a galvanic anode body and a hollow closed steel material are integrally configured.
【０００６】流電陽極の内部に中空部を設けるには、図
１のように中空密閉鋼材１を芯として流電陽極本体２を
鋳込むなど流電陽極本体２と中空密閉鋼材１とが一体に
なるように鋳造すれば良い。本第二発明は、中空密閉鋼
材が上記流電陽極本体の内部に設けられることを特徴と
する本第一発明記載の電気防食用流電陽極体に特徴を有
するものである。In order to provide a hollow portion inside the galvanic anode, the galvanic anode main body 2 and the hollow hermetically sealed steel material 1 are integrally formed by casting the galvanic anode main body 2 around the hollow hermetically sealed steel material 1 as shown in FIG. It should be cast so that A second aspect of the present invention is characterized in the galvanic anode body for cathodic protection according to the first aspect of the present invention, in which the hollow closed steel material is provided inside the galvanic anode body.
【０００７】また、流電陽極本体の外部に中空体を取付
けるには図２のように中空密閉鋼材１を台座として流電
陽極本体２を鋳込み、または図３のように流電陽極本体
２底部の取付具４を溶接あるいはボルトナットで中空密
閉鋼材１に固着すればよい。本第三発明は、中空密閉鋼
材が流電陽極本体の底部に設けられる本第一発明記載の
電気防食用流電陽極体に特徴を有する。このような構成
によれば流電陽極を水中に浸漬した際の質量が軽くなる
他、水中では流電陽極の重心が流電陽極本体２側に移動
するので中空密閉鋼材１が常に上を向き、中空密閉鋼材
１をメガフロート等の底面に溶接する等の方法による流
電陽極設置作業が容易になる。さらに、中空密閉鋼材１
を大きくして流電陽極全体の水中における比重を１以下
になるように構成すれば、この流電陽極に砂袋等の重り
を付けて比重をほぼ１の状態でメガフロート等の浮体構
造物底面まで水中運搬し、流電陽極取付位置に到達した
際に重りを切り離して中空密閉鋼材１がメガフロート等
の底面に押し当てられるようにできるので、潜水作業員
が流電陽極を支えていなくても溶接作業等を行うことが
できる。Further, in order to mount the hollow body on the outside of the galvanic anode body, the galvanic anode body 2 is cast by using the hollow closed steel material 1 as a base as shown in FIG. 2, or the bottom portion of the galvanic anode body 2 as shown in FIG. The attachment 4 may be welded or fixed to the hollow closed steel material 1 with bolts and nuts. The third aspect of the present invention is characterized by the galvanic anode body for cathodic protection according to the first aspect of the present invention, in which the hollow closed steel material is provided at the bottom of the galvanic anode body. With such a configuration, the mass of the galvanic anode when immersed in water is reduced, and the center of gravity of the galvanic anode moves to the galvanic anode main body 2 side in water, so that the hollow hermetically sealed steel material 1 always faces upward. The galvanic anode installation work by a method such as welding the hollow closed steel material 1 to the bottom surface of a megafloat or the like becomes easy. Furthermore, hollow closed steel material 1
If the specific gravity of the entire galvanic anode in water is set to 1 or less, a weight such as a sand bag is attached to the galvanic anode and the floating structure such as a megafloat is set to a specific gravity of approximately 1. It can be transported to the bottom surface underwater, and when it reaches the galvanic anode mounting position, the weight can be separated and the hollow closed steel material 1 can be pressed against the bottom surface of the megafloat, etc., so that the diving worker does not support the galvanic anode. Even welding work can be performed.
【０００８】[0008]
【発明の実施の形態】つぎに、本発明の流電陽極につい
て図面に基づいて具体的に説明する。図１は内部に中空
円筒状の鋼材を内部に有する本発明の陽極の断面を示し
たものである。中空円筒状の鋼材が外径約２００ｍｍ、
厚さ０．５ｍｍ、長さ９０ｃｍとするとその容積は約２
７７００ｃｍ３、質量は約２．３ｋｇである。図１の陽
極がアルミニウム合金陽極の場合、アルミニウムの比重
は約２.７であるから質量が５０kgの陽極本体２の容積
は約１８５００ｃｍ３ である。アルミニウム陽極全体
の質量はアルミニウム陽極本体の質量に中空円筒状の鋼
材の質量２．３kg が加わり５２．３ｋｇ、容積は約４
６２００ｃｍ３ であるので、このアルミニウム陽極の
水中における質量は５２．３ｋｇ−４６．２ｋｇ＝６．
１ｋｇとなる。一方、質量が５０kgの図３のような従来
型のアルミニウム陽極は容積が約１８５００ｃｍ３ 、
芯金３と取付具４を加えたアルミニウム陽極の質量は約
５３ｋｇであるのでこのアルミニウム陽極の水中におけ
る質量は５３ｋｇ−１８．５ｋｇ＝３４．５ｋｇとな
る。従って、図１のアルミニウム陽極の水中における質
量は図４の従来型のアルミニウム陽極よりも２８．４ｋ
ｇ、比率にして約８２％軽くなる。BEST MODE FOR CARRYING OUT THE INVENTION Next, the galvanic anode of the present invention will be specifically described with reference to the drawings. FIG. 1 shows a cross section of an anode of the present invention having a hollow cylindrical steel material inside. The hollow cylindrical steel material has an outer diameter of about 200 mm,
If the thickness is 0.5 mm and the length is 90 cm, the volume is about 2
It has a mass of 7700 cm 3 and a mass of about 2.3 kg. When the anode of FIG. 1 is an aluminum alloy anode, the specific gravity of aluminum is about 2.7, so the volume of the anode body 2 having a mass of 50 kg is about 18500 cm 3 . The total weight of the aluminum anode is 52.3 kg, with the weight of the aluminum anode body plus 2.3 kg of the hollow cylindrical steel material, and the volume is about 4
Since it is 6200 cm 3 , the mass of this aluminum anode in water is 52.3 kg-46.2 kg = 6.
It becomes 1 kg. On the other hand, a conventional aluminum anode with a mass of 50 kg as shown in FIG. 3 has a volume of about 18500 cm 3 ,
Since the mass of the aluminum anode including the core metal 3 and the fixture 4 is about 53 kg, the mass of this aluminum anode in water is 53 kg-18.5 kg = 34.5 kg. Therefore, the mass of the aluminum anode of FIG. 1 in water is 28.4 k compared to the conventional aluminum anode of FIG.
g, about 82% lighter in ratio.
【０００９】図２は半円筒状の陽極本体の底部に中空箱
体の鋼材を取付具として鋳造した本発明に係るアルミニ
ウム合金陽極の斜視図である。質量５０ｋｇの陽極本体
２の長さを１ｍとすると直径は２１．７ｃｍとなる。陽
極本体２の底部の中空箱体が幅３０ｃｍ、高さ３０ｃ
ｍ、長さ１ｍ、厚さ４．５ｍｍとするとその容積は約９
００００ｃｍ３、アルミニウム陽極全体の容積は１０８
５００ｃｍ３となる。一方、中空箱体の質量は約４８．
７ｋｇであり、陽極全体の質量は約９８．７ｋｇとな
る。従ってこのアルミニウム陽極の水中における質量は
９８．７ｋｇ−１０８．５ｋｇ＝−９．８ｋｇとなる。
水中ではこのアルミニウム合金陽極の重心が陽極本体２
側にあるため取付金具である中空箱体が上側になり水に
浮かぶ。このアルミニウム合金陽極に約１０ｋｇの砂袋
を取り付けてメガフロート等の浮体構造物底面の取付位
置まで水中運搬し、砂袋を切り裂いて砂を落とすと中空
箱体が浮体構造物底面に押しつけられるので潜水作業員
はアルミニウム合金陽極を支えることなく浮体構造物底
面に取付けることができる。FIG. 2 is a perspective view of an aluminum alloy anode according to the present invention, in which a steel material of a hollow box is cast as a fitting on the bottom of a semi-cylindrical anode body. If the length of the anode body 2 having a mass of 50 kg is 1 m, the diameter is 21.7 cm. The hollow box at the bottom of the anode body 2 has a width of 30 cm and a height of 30 c.
m, length 1 m, thickness 4.5 mm, the volume is about 9
0000 cm 3 , the total volume of the aluminum anode is 108
It will be 500 cm 3 . On the other hand, the hollow box has a mass of about 48.
It is 7 kg, and the total mass of the anode is about 98.7 kg. Therefore, the mass of this aluminum anode in water is 98.7 kg-108.5 kg = -9.8 kg.
In water, the center of gravity of this aluminum alloy anode is the anode body 2
Since it is on the side, the hollow box that is the mounting metal is on the upper side and floats on the water. A sand bag of about 10 kg is attached to this aluminum alloy anode and transported underwater to the attachment position of the bottom of the floating structure such as megafloat. When the sand bag is cut and the sand is dropped, the hollow box body is pressed against the bottom of the floating structure. The diving worker can mount the aluminum alloy anode on the bottom of the floating structure without supporting it.
【００１０】[0010]
【発明の効果】本発明の陽極は従来の陽極よりも水中浸
漬時の質量が軽いために潜水作業員による取付作業が容
易になる。また、陽極本体の底部に中空箱体の鋼材を取
付具として固着した本発明の陽極の重心が陽極本体側に
寄るため、取付金具である中空箱体が上側になり、メガ
フロートのような構造物の底部への陽極取付作業が楽に
なる。The anode of the present invention has a lighter mass when immersed in water than conventional anodes, and therefore can be easily installed by a diving worker. Further, since the center of gravity of the anode of the present invention, in which the steel material of the hollow box is fixed to the bottom of the anode body as a fixture, is closer to the anode body side, the hollow box body that is the mounting metal is on the upper side, and a structure like a megafloat Makes it easy to attach the anode to the bottom of the object.
【図１】本発明に係る電気防食用流電陽極の断面図であ
る。FIG. 1 is a sectional view of a galvanic anode for cathodic protection according to the present invention.
【図２】本発明に係る電気防食用流電陽極の斜視図であ
る。FIG. 2 is a perspective view of a galvanic anode for cathodic protection according to the present invention.
【図３】本発明に係る電気防食用流電陽極の斜視図であ
る。FIG. 3 is a perspective view of a galvanic anode for cathodic protection according to the present invention.
【図４】従来の電気防食用流電陽極の断面図である。FIG. 4 is a cross-sectional view of a conventional galvanic anode for cathodic protection.
【図５】従来の電気防食用流電陽極の斜視図である。FIG. 5 is a perspective view of a conventional galvanic anode for cathodic protection.
１ 中空密閉鋼材 ２ 陽極本体 ３ 芯金 ４ 取付金具 1 Hollow closed steel material 2 Anode body 3 core 4 Mounting bracket
Claims (3)
成された電気防食用流電陽極体。1. A galvanic anode body for galvanic protection in which a galvanic anode body and a hollow closed steel material are integrally formed.
内部に設けられることを特徴とする請求項１記載の電気
防食用流電陽極体。2. The galvanic anode body for cathodic protection according to claim 1, wherein the hollow closed steel material is provided inside the galvanic anode body.
底部に設けられることを特徴とする請求項１記載の電気
防食用流電陽極体。3. The galvanic anode body for cathodic protection according to claim 1, wherein the hollow closed steel material is provided at the bottom of the galvanic anode body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001305570A JP2003105574A (en) | 2001-10-01 | 2001-10-01 | Galvanic anode for electrolytic protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001305570A JP2003105574A (en) | 2001-10-01 | 2001-10-01 | Galvanic anode for electrolytic protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003105574A true JP2003105574A (en) | 2003-04-09 |
Family
ID=19125341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001305570A Pending JP2003105574A (en) | 2001-10-01 | 2001-10-01 | Galvanic anode for electrolytic protection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003105574A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392258A (en) * | 2011-11-08 | 2012-03-28 | 中国海洋石油总公司 | Marine hollow sacrificial anode |
-
2001
- 2001-10-01 JP JP2001305570A patent/JP2003105574A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392258A (en) * | 2011-11-08 | 2012-03-28 | 中国海洋石油总公司 | Marine hollow sacrificial anode |
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