JP5216826B2 - Antifouling structure of structural members - Google Patents

Description

  The present invention relates to an antifouling structure for a structural member, and more particularly to an antifouling structure for a structural member that can prevent dirt from adhering to the lower surface of the structural member.

  Conventionally, structures such as bridges, tanks, sluices, etc. have been constructed by processing materials such as steel materials at the factory to produce structural members that make up the structure, and then bringing the structural members into the field for assembly work. The In general, a structural member is exposed and stored outdoors after the structural member is manufactured at a factory until it is built on site. When the structural member is made of metal, rust is generated on the surface of the structural member while exposed and stored outdoors, and the rust flows due to rainfall or snowfall (hereinafter referred to as "rainfall etc."). There is a problem that dirt due to rust adheres to the rust (forms rust juice). In addition, there is a problem in that dust or soot floating in the atmosphere falls due to rain, etc., rain that contains dust or soot flows on the surface of the structural member, and dirt due to dust or soot adheres to the surface of the structural member. there were. In particular, since rain flowing on the surface of the structural member wraps around the lower surface of the structural member from the side surface or end surface of the structural member, there is a problem that the lower surface of the structural member becomes dirty.

  As a technique for preventing the surface of a structural member from becoming dirty due to rain or the like, Patent Document 1 discloses a technique for attaching a sponge to the side surface of a concrete bridge (structural member). In the technique disclosed in Patent Document 1, dust or soot contained in rain or the like is adsorbed on a sponge to purify the rain or the like, and the purified rain or the like is allowed to flow down. Thus, the surface of the structural member is kept beautiful.

Japanese Utility Model Publication No. 62-138708

  However, in the technique disclosed in Patent Document 1, when the sponge exceeds the ability to adsorb dust and soot, rainfall and the like including dust and soot flow on the surface of the structural member, and the flowing rain and the like wrap around the lower surface of the structural member. There is a problem that dirt adheres to the lower surface of the structural member.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an antifouling structure for a structural member that can prevent dirt from adhering to the lower surface of the structural member.

Means for Solving the Problems and Effects of the Invention

In order to achieve this object, according to the antifouling structure for a structural member according to claim 1, the rain flowing on the surface of the structural member is a sheet member that is attached to the surface that intersects the lower surface of the structural member at the ridge. Then, it flows down from the lower edge of the sheet member. Since the lower edge of the sheet member protrudes downward from the lower surface of the structural member, it is possible to prevent rain or the like flowing along the sheet member from entering the lower surface of the structural member. Thereby, there exists an effect which can prevent that the stain | pollution | contamination by influence of rain etc. adheres to the lower surface of a structural member.
In addition, since the structural member is placed so that a water gradient is formed, most of the rainfall and the like flow through the structural member from the water to the water along the water gradient. Some of the rain that flows from the water to the water tends to flow laterally away from the water gradient, but the rain that flows laterally away from the water gradient by the sheet member attached along the direction of the gradient Or the like can be prevented from entering the lower surface of the structural member. Thereby, there exists an effect which can improve the effect which prevents the stain | pollution | contamination by the influence of rain etc. adhering to the lower surface of a structural member.

  According to the antifouling structure for a structural member according to claim 2, the sheet member adhered to the structural member has a lower edge separated from a surface intersecting the lower surface and the ridge, and the lower edge is the same as the lower surface of the structural member. Therefore, it is possible to prevent rain or the like flowing through the sheet member from flowing down from the lower edge of the sheet member and wrapping around the lower surface of the structural member. Thereby, there exists an effect which can prevent that the stain | pollution | contamination by influence of rain etc. adheres to the lower surface of a structural member.

Further, since the structural member is placed so that the water gradient is formed, many of rainfall etc. through the structural member from the water to Underwater along the water gradient. Some of the rain that flows from the water to the water tends to flow laterally away from the water gradient, but the rain that flows laterally away from the water gradient by the sheet member attached along the direction of the gradient Or the like can be prevented from entering the lower surface of the structural member. Thus, contamination caused by the influence of such rainfall there is an effect of improving the effect of preventing the sticking to the lower surface of the structural member.

According to the antifouling structure for a structural member according to claim 3 , the rain flowing on the surface of the structural member is transmitted through the sheet member attached to the surface intersecting the lower surface and the ridge of the structural member, and the lower edge of the sheet member Flow down from. Since the lower edge of the sheet member protrudes downward from the lower surface of the structural member, it is possible to prevent rain or the like flowing along the sheet member from entering the lower surface of the structural member. Thereby, there exists an effect which can prevent that the stain | pollution | contamination by influence of rain etc. adheres to the lower surface of a structural member.
Further, the sheet member, because it is stuck to the surface which intersects with flange of the lower surface and edges of the structural member comprising a web and flanges, there is an effect of preventing the stains from sticking due to rainfall or the like to the lower surface of the flange.
Further, the sheet member is stuck so that the upper edge is located below the upper surface of the flange. On the other hand, when the sheet member is attached so that the upper edge is positioned above the upper surface of the flange, it is easy for rain to stay between the web on the upper surface of the flange and the sheet member, and There is a possibility that the rain that has fallen into the space between the sheet member and the flange, and the flange is likely to be corroded. Further, the upper edge side of the sheet member may be pushed by rain or the like staying on the upper surface of the flange, and the sheet member may be easily peeled off. According to the antifouling structure of the structural member according to the third aspect, it is possible to prevent rain or the like from staying on the upper surface of the flange, prevent corrosion of the flange, and make it difficult to peel off the sheet member.

According to the antifouling structure for a structural member according to claim 4, the sheet member adhered to the structural member has a lower edge separated from a surface intersecting the lower surface and the ridge, and the lower edge is the same as the lower surface of the structural member. Therefore, it is possible to prevent rain or the like flowing through the sheet member from flowing down from the lower edge of the sheet member and wrapping around the lower surface of the structural member. Thereby, there exists an effect which can prevent that the stain | pollution | contamination by influence of rain etc. adheres to the lower surface of a structural member.
In addition, since the sheet member is attached to the surface that intersects the lower surface of the flange of the structural member including the web and the flange, there is an effect that it is possible to prevent dirt due to rain or the like from adhering to the lower surface of the flange.
Further, the sheet member is stuck so that the upper edge is located below the upper surface of the flange. On the other hand, when the sheet member is attached so that the upper edge is positioned above the upper surface of the flange, it is easy for rain to stay between the web on the upper surface of the flange and the sheet member, and There is a possibility that the rain that has fallen into the space between the sheet member and the flange, and the flange is likely to be corroded. Further, the upper edge side of the sheet member may be pushed by rain or the like staying on the upper surface of the flange, and the sheet member may be easily peeled off. According to the antifouling structure of structural member according to claim 4, prevents the rain or the like on the upper surface of the flange is retained, it is possible to prevent corrosion of the flange, there is an effect that can easily peel the sheet member.

According to the antifouling structure for a structural member according to claim 5, it is possible to prevent rain or the like from flowing from the end surface on the water to the lower surface of the structural member by the sheet member adhered to the end surface on the water. Thus, in addition to the effect of any one of claims 1 to 4 , there is an effect of improving the effect of preventing dirt due to the influence of rainfall or the like from adhering to the lower surface of the structural member.

According to the antifouling structure for a structural member according to claim 6 , when the structural member is made of weathering steel, rust juice is produced due to rain or the like at the initial stage of exposure storage, and the lower surface of the structural member is contaminated with a yellowish brown color. In some cases, the sheet member prevents rain or the like from entering the lower surface of the structural member. Thereby, in addition to the effect in any one of Claims 1-5 , there exists an effect which can prevent that the lower surface of a structural member is contaminated with tan.

(A) is a side view of the structural member which shows the antifouling structure of the structural member in 1st Embodiment, (b) is a perspective view of the structural member under water. (A) is a perspective view of the structural member under water which shows the antifouling structure of the structural member in 2nd Embodiment, (b) is a perspective view of the structural member on the water. It is a front view of the structural member which shows the antifouling structure of the structural member in 3rd Embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. First, the antifouling structure of the structural member 1 in the first embodiment of the present invention will be described with reference to FIG. FIG. 1A is a side view of the structural member 1 showing the antifouling structure of the structural member 1, and FIG. 1B is a perspective view of the structural member 1 under water.

  As shown in FIG. 1, the structural member 1 includes an upper flange 2 and a lower flange 3, and a web 4 that connects the upper flange 2 and the lower flange 3. 11 is installed with a water gradient of 2% or more, and is exposed and stored outdoors in factories and the like. In the present embodiment, the water gradient is attached so that water flows from the right to the left in FIG.

  The structural member 1 is made of weathering steel. Weather-resistant steel is steel that contains alloy elements such as Cu, Cr, Ni, etc., and forms dense and highly adherent rust on the surface with the passage of years without being painted. The structural member 1 is manufactured as a member for a bridge girder.

  The sheet member 20 is a member that has water resistance and allows the rain or the like to flow down by blocking the wraparound or intrusion of the rain or the like. After the structural member 1 is placed on the supports 10 and 11, the sheet member 20 is attached to a surface (side surface 3 c) that intersects the lower surface 3 a and the ridge 3 b of the lower flange 3, and the lower edge 20 a of the sheet member 20 is The lower flange 3 protrudes downward from the lower surface 3a. In the present embodiment, the protruding length of the sheet member 20 (the distance between the lower surface 3a of the lower flange 3 and the lower edge 20a of the sheet member 20) is set to 2 cm or more.

  Rain or the like flows along the upper flange 2, the web 4, and the lower flange 3, and travels from the upper surface 3 d of the lower flange 3 to the sheet member 20 attached to the side surface 3 c of the lower flange 3, and below the sheet member 20. It flows down from the edge 20a. Since the lower edge 20a of the sheet member 20 protrudes downward from the lower surface 3a of the lower flange 3, it is possible to prevent rain or the like flowing along the sheet member 20 from flowing from the side surface 3c of the lower flange 3 to the lower surface 3a. As a result, it is possible to prevent dirt (such as rust juice) from being affected by rainfall or the like from adhering to the lower surface 3a of the lower flange 3.

  In weathering steel, rust formed on the surface may peel off and flow down due to rainfall or the like until rust with high adhesion is formed, particularly at the beginning of exposure storage. Since the lower surface 3a of the lower flange 3 is not a portion where rain or the like falls directly, if the rain or the like travels along the side surface 3c of the lower flange 3 and goes around the lower surface 3a, a flow mark remains on the lower surface 3a, and the lower surface 3a is yellowish brown. Contaminated in mottle. If the structural member 1 is a member for a girder used for a bridge, the apparent lower surface 3a after being erected on the site is contaminated, which impairs aesthetics. In the present embodiment, since the sheet member 20 is adhered to the side surface 3c of the lower flange 3, it is possible to prevent rain or the like from entering the lower surface 3a of the lower flange 3, and to prevent contamination of the lower surface 3a. Can be kept beautiful.

  In the present embodiment, as shown in FIG. 1 (b), the support 10 is longer than the width of the lower flange 3. The support 11 is longer than the width of the lower flange 3 as in the support 10, but the support 10 will be described below and the description of the support 11 is omitted.

  Since the support body 10 is longer than the width of the lower flange 3, as shown in FIG. 1B, the sheet member 20 adhered to the lower flange 3 has a part of the support body 10 in the vicinity of the support body 10. The lower edge 20 a of the sheet member 20 is positioned on the support 10. The support body 10 is formed in a mountain shape where two inclined surfaces 10 a and 10 b intersect at the top portion 10 c, and the top portion 10 c is in contact with the lower surface 3 a of the lower flange 3. Thereby, in the vicinity of the support body 10, the rain etc. which flow along the sheet | seat member 20 flow down to the support body 10, and fall along the inclined surfaces 10a and 10b. As a result, it is possible to prevent rain or the like flowing through the sheet member 20 from entering the lower surface 3a of the lower flange 3.

  It is possible to place the structural member 1 on the supports 10 and 11 after the sheet member 20 is attached to the lower flange 3. In this case, the sheet member 20 is attached to the lower flange 3 and the support 10. , 11 must be prevented from being sandwiched between them. This is because if the sheet member 20 is sandwiched between the lower flange 3 and the supports 10 and 11, the rain flowing through the sheet member 20 may wrap around the lower surface 3 a of the lower flange 3.

  As shown in FIG. 1A, the sheet member 20 is attached to the side surface 3c of the lower flange 3 along the direction of the gradient (the left-right direction in FIG. 1A). Since the structural member 1 is provided with a water gradient of 2% or more, most of the rain and the like flowing on the upper surface 3d of the lower flange 3 is from the water (right side of FIG. 1 (a)) to the water (FIG. 1 (a) left side) and flows down from the end surface 3e under water. Since there is a water gradient, there is a low possibility that rainfall or the like flowing from the underwater end surface 3e will enter the lower surface 3a of the lower flange 3.

  A part of the rain or the like flowing on the upper surface 3d of the lower flange 3 does not reach the end surface 3e under water but flows to the side surface 3c of the lower flange 3. When the sheet member 20 is not adhered to the side surface 3c of the lower flange 3, rain or the like wraps around from the side surface 3c to the lower surface 3a, tan rust juice adheres to the flow trace, and the lower surface 3a is a mottled tan Contaminated. On the other hand, in the present embodiment, since the sheet member 20 is adhered to the side surface 3c of the lower flange 3 along the gradient direction, it is possible to prevent rain or the like from flowing from the side surface 3c of the lower flange 3 to the lower surface 3a. It is possible to effectively prevent the lower surface 3a of the lower flange 3 from being contaminated.

  Further, since the sheet member 20 is adhered to the side surface 3c of the lower flange 3 from the water surface to the water surface in the direction of the gradient without any gap, the rain or the like is transmitted from the upper surface 3d of the lower flange 3 to the side surface 3c. It is possible to reliably prevent wrapping around 3a. In addition, the sheet | seat member 20 can use the adhesive sheet by which the adhesive was apply | coated to the back surface of strips, such as a product made from a synthetic resin and paper. Moreover, it is also possible to apply | coat an adhesive continuously to the side surface 3c of the lower flange 3, and to paste the sheet | seat member 20 there.

  As shown in FIGS. 1A and 1B, the sheet member 20 is stuck so that the upper edge 20 b is positioned below the upper surface 3 d of the lower flange 3. On the other hand, when the sheet member 20 is attached so that the upper edge 20b is positioned above the upper surface 3d of the lower flange 3, it is attached to the upper surface 3d of the lower flange 3 between the web 4 and the sheet member 20. Rain or the like tends to stay, and the staying rain or the like may permeate between the seat member 20 and the lower flange 3, which may cause the lower flange 3 to be easily corroded. Further, the upper edge 20b side of the sheet member 20 is pushed by rain or the like staying on the upper surface 3d of the lower flange 3, and the sheet member 20 may be easily peeled off. According to the present embodiment, it is possible to prevent rain or the like from staying on the upper surface 3d of the lower flange 3, to prevent corrosion of the lower flange 3, and to prevent the sheet member 20 from being peeled off.

  The sheet member 20 is detachably attached to the structural member 1. Accordingly, when the sheet member 20 is adhered during the exposure storage from the time when the structural member 1 is manufactured at the factory until it is constructed at the site, and when the structure is constructed at the site, the sheet member 20 unnecessary for the structure. Can be peeled off.

  As described above, according to the antifouling structure of the structural member 1 in the first embodiment, since the sheet member 20 is stuck so that the lower edge 20a protrudes below the lower surface 3a of the lower flange 3, Rain or the like is prevented from entering the lower surface 3 a of the lower flange 3.

  Next, a second embodiment will be described with reference to FIG. In 1st Embodiment, the structural member 1 was provided with the upper flange 2, the lower flange 3, and the web 4 which connects them, and demonstrated the case where it was manufactured with a weathering steel. On the other hand, 2nd Embodiment demonstrates the case where the structural member 101 is comprised as a tubular body of cross-sectional substantially rectangular shape, and is manufactured with concrete. In addition, although illustration is abbreviate | omitted, the structural member 101 in 2nd Embodiment shall be constructed by the support body similarly to 1st Embodiment, and the water gradient shall be attached to the longitudinal direction. FIG. 2A is a perspective view of the structural member 101 under water showing the antifouling structure of the structural member 101 in the second embodiment, and FIG. 2B is a perspective view of the structural member 101 above water.

  As shown in FIG. 2A, the sheet member 120 is attached to a surface (side surface 101c) that intersects the lower surface 101a of the structural member 101 and the ridge 101b. The lower edge 120 a of the sheet member 120 protrudes downward from the lower surface 101 a of the structural member 101. Rain or the like flows along the upper surface 101d and the side surface 101c of the structural member, travels down the sheet member 120 attached to the surface (side surface 101c) that intersects the lower surface 101a and the ridge 101b of the structural member 101, and flows under the sheet member 120. It flows down from the edge 120a. Since the lower edge 120a of the sheet member 120 protrudes downward from the lower surface 101a of the structural member 101, it is possible to prevent rain or the like flowing along the sheet member 120 from flowing from the side surface 101c of the structural member 101 to the lower surface 101a. As a result, it is possible to prevent dirt (flow traces of dust, soot and the like) due to the influence of rainfall and the like from adhering to the lower surface 101a of the structural member 101.

  Further, as shown in FIG. 2B, the sheet member 121 is attached to a surface (an end surface 101f on the water) that intersects the lower surface 101a of the structural member 101 and the ridge 101e. The lower edge 121 a of the sheet member 121 protrudes downward from the lower surface 101 a of the structural member 101. Rain or the like flowing along the end surface 101f of the structural member 101 flows down from the lower edge 121a of the sheet member 121 through the sheet member 121 attached to the end surface 101f. Since the lower edge 121a of the sheet member 121 protrudes downward from the lower surface 101a of the structural member 101, it is possible to prevent rain or the like flowing along the sheet member 121 from flowing from the end surface 101f of the structural member 101 to the lower surface 101a. As a result, it is possible to prevent dirt (flow traces of dust, soot and the like) due to the influence of rainfall and the like from adhering to the lower surface 101a of the structural member 101.

  As shown in FIG. 2B, the sheet member 121 is stuck so that the upper edge 121b is positioned below the inner lower surface 101g of the structural member 101. This is to prevent rain or the like from entering between the sheet member 121 and the end surface 101f and the sheet member 121 from being easily peeled off during exposure storage.

  In addition, the rain etc. which flow along the inner lower surface 101g of the structural member 101 due to the water gradient reach the underwater end surface 101h (see FIG. 1A) and flow down from the end surface 101h. Since the water gradient is provided, there is a low possibility that the rain or the like flowing down from the end surface 101h will enter the lower surface 101a of the structural member 101.

  As described above, according to the antifouling structure of the structural member 101 in the second embodiment, the sheet members 120 and 121 are attached so that the lower edges 120a and 121a protrude below the lower surface 101a of the structural member 101. Therefore, it is possible to prevent rain or the like from entering the lower surface 101a of the structural member 101.

  Next, a third embodiment will be described with reference to FIG. In the first embodiment and the second embodiment, the lower edges 20a, 120a, 121a of the sheet members 20, 120, 121 attached to the structural members 1, 101 are lower than the lower surfaces 3a, 101a of the structural members 1, 101. The case where it protrudes below was demonstrated. On the other hand, 3rd Embodiment demonstrates the case where the lower edge 220a of the sheet member 220 stuck on the structural member 201 is located in the same height as the lower surface 201a of the structural member 201. FIG. In addition, the same code | symbol is attached | subjected about the part same as 1st Embodiment, and the following description is abbreviate | omitted.

  FIG. 3 is a front view of the structural member 201 showing the antifouling structure of the structural member 201 in the third embodiment. The structural member 201 is configured as a tubular body having a substantially rectangular cross section. The sheet member 220 is adhered to a surface (side surface 201c) that intersects the lower surface 201a of the structural member 201 with the ridge 201b, the lower edge 220a is separated from the side surface 201c, and the lower edge 220a is the same as the lower surface 201a of the structural member 201. Is located at the height of This structure can be realized by manufacturing the sheet member 220 from a hard material and molding the sheet member 220 so that the lower edge 220a spreads outward with respect to the upper edge 220b of the sheet member 220. Alternatively, this structure can be realized by manufacturing the sheet member 220 from a soft material and supporting the sheet member 220 with another member so that the lower edge 220a spreads outward with respect to the upper edge 220b of the sheet member 220. .

  In these cases, since rain or the like flowing through the sheet member 220 flows from the lower edge 220a of the sheet member 220 separated from the structural member 201, the rain or the like is prevented from flowing around the lower surface 201a of the structural member 201. . As a result, it is possible to prevent dirt due to rain or the like from adhering to the lower surface 201a of the structural member 201.

  The lower edge 220a of the sheet member 220 and the side surface 201c of the structural member 201 are spaced apart so that the liquid droplets staying on the lower edge 220a of the sheet member 220 cannot contact the side surface 201c of the structural member 201. This is because when the droplet contacts the side surface 201c of the structural member 201, the droplet is transmitted to the lower surface 201a of the structural member 201 and the lower surface 201a is contaminated.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed. For example, the numerical values given in the above embodiment are merely examples, and other numerical values can naturally be adopted.

  In the first embodiment, the case where the structural member 1 having an I-shaped cross section including the upper flange 2, the lower flange 3, and the web 4 is described. However, the present invention is not necessarily limited to this, and other cross-sectional shapes are used. It is also possible to employ structural members. Other cross-sectional shapes include, for example, an L shape and a T shape including a flange and a web. Moreover, the box girder which comprised the flange and the web in the box shape using a steel plate, an angle steel, etc. can also be mentioned.

  In the first embodiment, the case where the weather resistant steel is used without painting has been described. However, the present invention is not necessarily limited to this, and the weather resistant steel can be subjected to painting treatment. It is also possible to apply to the weathering steel a treatment agent that promotes the formation of dense and highly adhesive rust. Moreover, it is also possible to apply to the structural member 1 manufactured with other steel materials, cast iron, etc. instead of weathering steel. Also in these cases, it is possible to prevent the flow trace formed by rainfall or the like from adhering to the lower surface 3 a of the structural member 1.

  Although description is abbreviate | omitted in the said 1st Embodiment, it is also possible to stick a sheet | seat member on the end surface on the surface of the structural member 1 like the sheet | seat member 121 demonstrated in 2nd Embodiment. Thereby, it is possible to reliably prevent rain or the like from flowing from the end surface of the structural member 1 on the water to the lower surface 3a.

  Although the description is omitted in each of the above embodiments, the sheet members 20 and 120 can be adhered to the underwater end surfaces 3e and 101h of the structural members 1 and 101, respectively. By attaching the sheet members 20 and 120 to the underwater end surfaces 3e and 101h, dirt such as rust juice is formed on the edges of the lower surfaces 3a and 101a and the end surfaces 3e and 101h of the structural members 1 and 101 where rain flows down. It can prevent sticking.

1,101,201 Structural member 3 Lower flange (flange)
4 Web 3a, 101a, 201a Lower surface 3b, 101b, 101e, 201b Edge 3d Upper surface 101f End surface 20, 120, 121, 220 Sheet member 20a, 120a, 121a, 220a Lower edge 20b, 121b Upper edge

Claims (6)

It comprises a sheet member that is adhered to the surface that intersects the lower surface and the ridge of the structural member,
The structural member is placed so that a water gradient is formed,
An antifouling structure for a structural member, wherein the sheet member has a lower edge protruding downward from a lower surface of the structural member and is adhered along a gradient direction . It comprises a sheet member that is adhered to the surface that intersects the lower surface and the ridge of the structural member,
The structural member is placed so that a water gradient is formed,
The sheet member has a lower edge separated from a surface intersecting at the ridge, and the lower edge is positioned at the same height as the lower surface of the structural member, and is adhered along a gradient direction. Antifouling structure for structural members. It comprises a sheet member that is adhered to the surface that intersects the lower surface and the ridge of the structural member,
The structural member comprises a web and a flange;
The sheet member is attached to a surface that intersects the lower surface of the flange with a ridge, and is attached so that an upper edge is positioned below the upper surface of the flange, and below the lower surface of the structural member. An antifouling structure for a structural member, wherein a lower edge is projected. It comprises a sheet member that is adhered to the surface that intersects the lower surface and the ridge of the structural member,
The structural member comprises a web and a flange;
The sheet member is attached to a surface that intersects the lower surface of the flange with a ridge, and is adhered so that an upper edge is positioned below the upper surface of the flange, and the lower edge from the surface that intersects with the ridge And the lower edge is positioned at the same height as the lower surface of the structural member. The said sheet | seat member is affixed on the end surface on water, The antifouling structure of the structural member in any one of Claim 1 to 4 characterized by the above-mentioned. The antifouling structure for a structural member according to any one of claims 1 to 5 , wherein the structural member is made of weathering steel.

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