Fender structure, water area structure and replacement method

Abstract

To provide a fender structure excellent in corrosion resistance, a water area structure, and a replacement method of a fender provided on the fender structure.SOLUTION: A fender structure 1 in which a ship comes alongside a pier has a rubber fender 10, and a first alloy part 20 to which the rubber fender 10 is connected. In the first alloy part 20, a part with which the rubber fender 10 is brought into contact is made of a Ni-based alloy.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to fender structures, water body structures, and replacement methods. [Background technology]

[0002] Conventionally, fender structures are sometimes provided on water structures. Patent Document 1 discloses a fender that includes a buffer section for cushioning the impact when a ship comes alongside, and a quay wall fixing section for attaching the buffer section to a quay or the like, the quay wall fixing section including a fixing member that has higher rust resistance than iron materials. Patent Document 2 discloses a fender structure having a wear-resistant steel material connected to a steel structure in water and a rubber fender connected to the wear-resistant steel material, the wear-resistant steel material being made of stainless steel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-20625 [Patent Document 2] Patent Publication No. 2021-8780 Summary of the Invention [Problem to be solved by the invention]

[0004] However, Patent Documents 1 and 2 leave room for improvement in terms of corrosion resistance.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a method for replacing fenders installed on fender structures, water area structures, and fender structures that have excellent corrosion resistance. [Means for solving the problem]

[0006] A fender structure according to one embodiment of the present disclosure is a fender structure for ships to dock at, and is characterized in that it comprises a rubber fender and a first alloy part to which the rubber fender is connected, and that the portion of the first alloy part that comes into contact with the rubber fender is made of a Ni-based alloy. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a fender structure, an underwater structure, and a method for replacing fenders installed on a fender structure that have excellent corrosion resistance. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a plan view of the fender structure according to the embodiment. [Figure 2] 10A and 10B are schematic diagrams illustrating a removal step according to the embodiment. [Figure 3] FIG. 10 is a schematic diagram showing a replacement step according to the embodiment. [Figure 4] In this variation, the fastening portion further includes a washer. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a fender structure according to one embodiment of the present disclosure and a method for replacing a rubber fender included in the fender structure will be described with reference to the drawings. First, the fender structure according to this embodiment will be described. As will be described later, the fender structure is attached to an offshore structure or the like. As a result, when a ship comes alongside an offshore structure or the like, the ship comes into contact with the fender structure. In this way, the fender structure prevents direct contact between the ship and the offshore structure or the like to which the fender structure is attached. In this way, the fender structure prevents damage to the ship and the offshore structure or the like to which the fender structure is attached. The object to which the fender structure is attached is, for example, a quay. Alternatively, the object to which the fender structure is attached may be a mooring facility such as a pier, a monopile driven into the seabed, a jacket structure installed in the ocean, etc. Hereinafter, in this embodiment, the object to which the fender structure is attached as described above will be referred to as an aquatic structure.

[0010] (Outline of fender structure) FIG. 1 is a plan view of a fender structure 1 according to an embodiment. Hereinafter, when indicating directions in the description of this embodiment, as shown in Figure 1, the thickness direction of the first alloy part 20 described later will be referred to as the first direction D1, the width direction of the first alloy part 20 shown in Figure 1 which is perpendicular to the first direction D1 will be referred to as the second direction D2, and the direction perpendicular to both the first direction D1 and the second direction D2 will be referred to as D3. As shown in Figure 1, the fender structure 1 is attached to an offshore structure 2. The fender structure 1 has a rubber fender 10, a first alloy part 20, a third plate 30, and a fastening part 40.

[0011] (About rubber fenders) The rubber fender 10 shown in Figure 1 is the part that comes into contact with a ship. The rubber fender 10 protects the ship by absorbing the impact when the ship comes alongside the fender structure 1. As shown in Figure 1, the rubber fender 10 is attached to the first alloy part 20 by a fastening part 40. 1, the rubber fender 10 includes an attachment portion 11 and a buffer portion 12. In this embodiment, the attachment portion 11 and the buffer portion 12 are integrally formed from, for example, rubber.

[0012] (About the mounting part) 1, the attachment portion 11 is a portion that is attached to the first alloy portion 20. In other words, the attachment portion 11 is a portion of the rubber fender 10 that comes into contact with the first alloy portion 20. As shown in Fig. 1, the mounting portion 11 is formed into a plate shape from rubber. The mounting portion 11 is attached to a first plate 21 (described later) of the first alloy portion 20 by a fastening portion 40. For this reason, the mounting portion 11 has a through hole 11a through which the fastening portion 40 is inserted, as shown in Fig. 1. A plurality of through holes 11a are provided at intervals along the longitudinal direction (third direction D3) of the rubber fender 10, for example.

[0013] In this embodiment, a steel plate (not shown) is embedded inside the mounting portion 11. The steel plate may be, for example, a rolled steel plate such as SS400. The steel plate has the function of reinforcing the mounting portion 11, thereby enabling the rubber fender 10 and the first alloy portion 20 to be attached more securely. The steel plate (not shown) is entirely covered with rubber that forms the mounting portion 11. The steel plate is arranged so that it is completely invisible from the outside even when the rubber fender 10 is not attached to the first alloy portion 20. Specifically, for example, the steel plate is also covered with rubber in the portion that contacts the first alloy portion 20. For example, the steel plate is also covered with rubber in the portion facing the through hole 11a. This prevents the occurrence of galvanic corrosion and crevice corrosion between the steel plate and other components that make up the fender structure 1. However, the steel plate is not necessary.

[0014] (About the buffer section) The buffer portion 12 is the portion of the rubber fender 10 that comes into contact with a vessel. The buffer portion 12 is formed, for example, in a V-shape in plan view, as shown in FIG. 1. This forms, for example, a planar portion 12a at the tip of the V-shape that can be contacted by a vessel. Alternatively, the buffer portion 12 may have any other shape, as long as it can form a portion equivalent to the planar portion 12a that can be contacted by a vessel. The buffer portion 12 is deformable when a vessel comes into contact with it. This allows the buffer portion 12 to absorb the impact when a vessel comes into contact with the rubber fender 10. This makes it possible to reduce damage to the vessel.

[0015] (Regarding the first alloy part) 1, the first alloy part 20 is a part to which the rubber fender 10 is connected. The first alloy part 20 and the rubber fender 10 are connected by a fastening part 40. In this embodiment, an alloy containing at least 50% or more of nickel is used for at least the portion 20A of the first alloy portion 20 that comes into contact with the rubber fender 10. Alternatively, the portion 20A may be made of a Ni-based alloy. An example of the Ni-based alloy is ALLOY-C276. The Ni-based alloy is an alloy containing nickel as a main component. Whether the first alloy portion 20 is a Ni-based alloy can be confirmed, for example, by checking whether the nickel content is 50% or more. Alternatively, without using such a method, if the steel plate used in the first alloy portion 20 is identified by its trade name or the like and the specifications of this steel plate state that the nickel content is 50% or more, the first alloy portion 20 may be determined to be a Ni-based alloy. Here, Ni-based alloys have a relatively low ionization tendency compared to stainless steels and the like. Therefore, by using a Ni-based alloy for the first alloy portion 20, it is possible to suppress the occurrence of crevice corrosion between the first alloy portion 20 and the rubber fender 10.

[0016] The first alloy part 20 is composed of a plurality of plates as shown in Fig. 1. In this embodiment, the first alloy part 20 includes two plates. That is, the first alloy part 20 includes a first plate 21 and a second plate 22 as shown in Fig. 1. As shown in Fig. 1, the first plate 21, the second plate 22, and the rubber fender 10 are arranged in the order of the rubber fender 10, the first plate 21, and the second plate 22. Therefore, as shown in Fig. 1, the first plate 21 includes a portion 20A that comes into contact with the rubber fender 10. In this embodiment, the first plate 21 and the second plate 22 are made of a Ni-based alloy, which prevents galvanic corrosion and crevice corrosion from occurring between the first plate 21 and the second plate 22.

[0017] (Regarding the first plate) As shown in FIG. 1, the first plate 21 is one of the multiple plates that make up the first alloy portion 20. As described above, the first plate 21 includes a portion 20A that comes into contact with the rubber fender 10. In other words, the first plate 21 is the plate to which the rubber fender 10 is attached. When replacing the rubber fender 10 in the fender structure 1, the first plate 21 is removed from the water structure 2 together with the rubber fender 10 (details will be described later).

[0018] (About the second plate) As shown in FIG. 1, the second plate 22 is one of the multiple plates that make up the first alloy part 20. The first plate 21 is attached to the second plate 22. The second plate 22 is attached to the offshore structure 2 via the third plate 30. The first plate 21 is removed from the second plate 22 and is then removed from the offshore structure 2 together with the rubber fender 10. In this embodiment, the first plate 21 overlaps the second plate 22, as shown in Fig. 1. That is, the entire surface of the first plate 21 that faces the second plate 22 is in contact with the second plate 22. Alternatively, only a portion of the surface of the first plate 21 that faces the second plate 22 may be in contact with the second plate 22. This makes it easier to replace the rubber fenders 10 in the fender structure 1.

[0019] (About the third plate) As shown in Figure 1, the third plate 30 connects the first alloy part 20 and the water structure 2. Specifically, the third plate 30 connects the second plate 22 of the first alloy part 20 and the water structure 2. While the first plate 21 and the second plate 22 are stacked, the third plate 30 is long in the stacking direction of the first plate 21 and the second plate 22 (first direction D1). One end of the third plate 30 is joined to the side of the first alloy part 20 opposite the rubber fender 10, on the side of the second plate 22. The other end of the third plate 30 is connected to the offshore structure 2. In this embodiment, the portion of the offshore structure 2 to which the other end of the third plate 30 is connected is made of, for example, stainless clad steel. That is, in this embodiment, the other end of the third plate 30 is connected to a member made of stainless clad steel.

[0020] In this embodiment, the third plate 30 includes a connecting plate 31 and a reinforcing plate 32, as shown in FIG. The connecting plate 31 is a plate-shaped member having both ends connected to the first alloy part 20 and the water area structure 2, respectively. More specifically, as shown in FIG. 1 , one end of the connecting plate 31 is joined to the second plate 22, and the other end is connected to a stainless clad steel member of the water area structure 2. In this embodiment, the one end and the other end of the third plate 30 refer to the one end and the other end of the connecting plate 31. As shown in FIG. 1, the reinforcing plate 32 is a plate-like member that reinforces the connection between the connecting plate 31 and the second plate 22.

[0021] In this embodiment, the third plate 30 is made of stainless steel. That is, the connecting plate 31 and the reinforcing plate 32 are made of stainless steel. This reduces the amount of Ni-based alloy used in the fender structure 1, contributing to cost reduction of the fender structure 1. In this embodiment, one end of the third plate 30 is joined to the second plate 22 by welding. The alloy used for welding includes a Ni-based alloy. As described above, the second plate 22 is made of a Ni-based alloy. This prevents crevice corrosion from occurring between the second plate 22 and the third plate 30.

[0022] (Regarding fastening parts) The fastening portion 40 connects together the above-mentioned components of the fender structure 1. As shown in Fig. 1 , the fastening portion 40 includes a first bolt 41, a first nut 42, a second bolt 43, and a second nut 44.

[0023] 1, the first bolt 41 connects the first plate 21 and the second plate 22. In other words, the first plate 21 is attached to the second plate 22 by the first bolt 41. The first bolt 41 is a separate member from the first alloy portion 20, and is inserted into a through-hole (not shown) formed in the first alloy portion 20. 1, the first nut 42 is fastened to the first bolt 41. In this way, the first plate 21 and the second plate 22 are connected to each other.

[0024] 1, the second bolt 43 connects the rubber fender 10 and the first plate 21. In other words, the second bolt 43 connects the mounting portion 11 of the rubber fender 10 and the first plate 21 including the portion 20A that comes into contact with the rubber fender 10. 1, the second bolt 43 is a stud bolt attached to the first plate 21. This prevents the second bolt 43 from being exposed on the surface of the first plate 21 facing the second plate 22. This prevents a gap from being generated between the first plate 21 and the second plate 22. 1, the second nut 44 is fastened to the second bolt 43. In this way, the rubber fender 10 and the first plate 21 are connected together.

[0025] In this embodiment, the first bolt 41, the first nut 42, the second bolt 43, and the second nut 44 may each be made of, for example, stainless steel or a Ni-based alloy, thereby suppressing the occurrence of galvanic corrosion and crevice corrosion between the fastening portion 40 and each component of the fender structure 1. In this embodiment, commercially available items are preferably used for the first bolt 41, the first nut 42, the second bolt 43, and the second nut 44. This preferably reduces the cost of the fastening unit 40. FIG. 4 shows a modified example in which the fastening portion 40 further includes a washer W. As shown in FIG. 4 , the fastening portion 40 may further include a washer W. As shown in FIG. 4 , for example, an L-shaped washer W is used. That is, the washer W includes, for example, a first portion W1 facing the plate surface of the first plate 21 or the plate surface of the mounting portion 11, and a second portion W2 that bends and protrudes from an end of the first portion W1 in the second direction D2. This allows the second portion W2 to be hooked onto the end of the first plate 21 or the mounting portion 11 in the second direction D2, thereby preventing the washer W from spinning freely when the fastening portion 40 is fastened. Note that when such a washer W is used, the first nut 42 or the second nut 44 may be welded to the washer W. This may achieve the above-mentioned effect without welding the washer W to the first plate 21 or the mounting portion 11. In this embodiment, the washer W is preferably made of a Ni-based alloy. A normal-shaped washer may be used instead of the washer W described above. The first bolt 41, the first nut 42, and the second nut 44 may each include a washer.

[0026] (How to replace rubber fenders) Next, we will explain the method for replacing the rubber fenders 10 that the fender structure 1 according to this embodiment has. The rubber fenders 10 are replaced by the method described below, for example, when they have deteriorated over time or when they have been damaged by contact with a ship or the like. The replacement method according to this embodiment includes a removal step, a replacement step, and an installation step.

[0027] (Removal steps) FIG. 2 is a schematic diagram showing a removal step according to the embodiment. The removal step is a process of removing the first plate 21, to which the rubber fender 10 is attached, from the second plate 22, as shown in FIG. In the removal step, first, as shown in FIG. 2, the first nut 42 is removed from the first bolt 41. Then, the first plate 21 is removed from the second plate 22. As a result, the rubber fender 10 is removed from the offshore structure 2 together with the first plate 21. At this time, as shown in FIG. 2, the second plate 22 remains attached to the offshore structure 2 even after the first plate 21 has been removed from the offshore structure 2 together with the rubber fender 10. This makes it possible to easily replace the rubber fender 10 by attaching the first plate 21, to which a new rubber fender 10 has been attached, to the second plate 22. In this embodiment, the removal step is performed by an operator, for example, underwater or on the sea.

[0028] (Replacement steps) FIG. 3 is a schematic diagram showing the replacement step according to the embodiment. As shown in Fig. 3, the replacement step is a process of replacing the rubber fender 10 attached to the first plate 21 removed in the removal step with a new rubber fender 10. The new rubber fender 10 may be of the same shape as the rubber fender 10 before replacement, or may be of a different shape. In the replacement step, first, as shown in Figure 3, the second nuts 44 are removed from the second bolts 43. Next, the rubber fender 10 is removed from the first plate 21. After that, the first plate 21 and the new rubber fender 10 are aligned. Then, the first plate 21 and the new rubber fender 10 are fixed together with the second bolts 43 and the second nuts 44. In this embodiment, the replacement step is performed, for example, on a work vessel or on land. In this way, the replacement step is not performed underwater, which can improve the workability and safety of the replacement step.

[0029] (Installation steps) The attachment step is a process of attaching the first plate 21, in which the rubber fender 10 has been replaced with a new rubber fender 10 in the replacement step, to the second plate 22. In the attachment step, first, the first plate 21 and the second plate 22 are aligned. Then, the first plate 21 and the second plate 22 are fixed together with the first bolt 41 and the first nut 42. This returns the fender structure 1 to the state shown in FIG. In this embodiment, the installation step is performed by a worker, for example, underwater or on the sea. The rubber fender 10 is replaced through the above steps.

[0030] As explained above, in the fender structure 1 according to this embodiment, of the first alloy part 20 to which the rubber fender 10 is connected, the part 20A that comes into contact with the rubber fender 10 is made of a Ni-based alloy. This makes it possible to suppress the occurrence of crevice corrosion between the first alloy part 20 and the rubber fender 10, compared to, for example, when the part 20A of the first alloy part 20 that comes into contact with the rubber fender 10 is made of stainless steel. Therefore, the fender structure 1 can be made to have better corrosion resistance.

[0031] The first alloy portion 20 also includes a first plate 21, which includes a portion 20A that contacts the rubber fender 10, and a second plate 22. The first plate 21, the second plate 22, and the rubber fender 10 are arranged in the following order: rubber fender 10, first plate 21, second plate 22. The first plate 21 overlaps the second plate 22. This allows, for example, removing the rubber fender 10 from the aquatic structure 2 where the fender structure 1 is installed by removing the first plate 21 connected to the rubber fender 10 from the second plate 22. Furthermore, replacing the rubber fender 10 with a new one can be performed by attaching the first plate 21 connected to the new rubber fender 10 to the second plate 22. This simplifies the work at the aquatic structure 2 where the fender structure 1 is installed. The first plate 21 and the second plate 22 are made of a Ni-based alloy. This makes it possible to suppress the occurrence of galvanic corrosion and crevice corrosion between the first plate 21 and the second plate 22, compared to when the first plate 21 and the second plate 22 are made of stainless steel, for example. This allows the fender structure 1 to have even better corrosion resistance.

[0032] The first plate 21 is attached to the second plate 22 by the first bolts 41. This allows the first plate 21 to be easily attached to and detached from the second plate 22. The first bolts 41 are made of a Ni-based alloy. This makes it possible to suppress the occurrence of galvanic corrosion and crevice corrosion between the first bolts 41 and the first and second plates 21 and 22, compared to when the first bolts 41 are made of stainless steel, for example. This allows the fender structure 1 to have even better corrosion resistance. For example, when commercially available first bolts 41 are used, the procurement of the first bolts 41 can be made easier and the cost of the first bolts 41 can be reduced.

[0033] Furthermore, one end of a stainless steel third plate 30 is welded to the side of the first alloy portion 20 opposite the rubber fender 10, which is the side of the second plate 22. That is, the third plate 30 is made of stainless steel. This reduces the cost of the third plate 30 compared to when the third plate 30 is made of a Ni-based alloy. Furthermore, the alloy used to weld the second plate 22 and the third plate 30 together contains a Ni-based alloy. That is, the stainless steel third plate 30 is welded to the Ni-based alloy second plate 22 using a welding alloy containing a Ni-based alloy. This prevents galvanic corrosion from occurring between the second plate 22 and the third plate 30. This results in a fender structure 1 with even better corrosion resistance.

[0034] The other end of the third plate 30 is connected to a member made of stainless clad steel. This makes it possible to prevent galvanic corrosion from occurring between the stainless steel third plate 30 and the member made of stainless clad steel. This makes it possible to provide the fender structure 1 with even better corrosion resistance.

[0035] Furthermore, the rubber fender 10 and the portion 20A that comes into contact with the rubber fender 10 are connected by a second bolt 43. The second bolt 43 is made of a Ni-based alloy. This makes it possible to prevent the occurrence of galvanic corrosion and crevice corrosion between the rubber fender 10 and the portion 20A that comes into contact with the rubber fender 10, compared to when the second bolt 43 is made of stainless steel, for example. This allows the fender structure 1 to have even better corrosion resistance. For example, when a commercially available second bolt 43 is used, the procurement of the second bolt 43 is made easier and the cost of the second bolt 43 can be reduced.

[0036] Furthermore, the offshore structure 2 according to this embodiment is equipped with the fender structure 1 according to the present disclosure. As a result, the offshore structure 2 can enjoy the above-mentioned effects.

[0037] Furthermore, according to the method for replacing the rubber fenders 10 of the fender structure 1 according to this embodiment, first, in a removal step, the first plate 21 to which the rubber fenders 10 are attached is removed from the second plate 22. Next, the rubber fenders 10 attached to the first plate 21 removed in the removal step are replaced with new rubber fenders 10 in a replacement step. Then, the first plate 21 in which the rubber fenders 10 have been replaced with new rubber fenders 10 in the replacement step is attached to the second plate 22 in an attachment step. By removing the first plate 21 to which the rubber fenders 10 are attached from the second plate 22 in the removal step, the rubber fenders 10 can be replaced in the replacement step at any location. Therefore, for example, it is possible to avoid performing the replacement of the rubber fenders 10 in the replacement step in a location where work is difficult, such as underwater. Therefore, the workability and safety of the rubber fender 10 replacement work can be further improved.

[0038] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure. For example, only the portion 20A of the first plate 21 that comes into contact with the rubber fender 10 may be made of a Ni-based alloy. Furthermore, stainless steel plates coated with a Ni-based alloy may be used for the first plate 21 and the second plate 22. Specifically, for example, the first plate 21 and the second plate 22 may be stainless steel plates whose surfaces are lined or overlaid with a Ni-based alloy. In this case, it is preferable that the surface of the stainless steel coated with the Ni-based alloy has been subjected to a rust prevention treatment. Furthermore, the bolts and nuts that constitute the fastening portion 40 do not have to be made of a Ni-based alloy. Furthermore, the alloy used when welding the third plate 30 to the first alloy part 20 does not have to contain a Ni-based alloy. Alternatively, the third plate 30 and the first alloy part 20 may be joined by a method other than welding. Furthermore, although the first alloy portion 20 has been described as including two plates, it may include three or more plates. Furthermore, the member of the fender structure 1 to which the other end of the third plate 30 is connected does not have to be made of stainless clad steel. Alternatively, the third plate 30 does not have to be provided.

[0039] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate.

[0040] (Addendum) The fender structure according to the embodiment can be understood, for example, as follows.

[0041] <1> A fender structure according to one embodiment of the present disclosure is a fender structure for ships to dock at, and is characterized in that it comprises a rubber fender and a first alloy part to which the rubber fender is connected, and that the portion of the first alloy part that comes into contact with the rubber fender is made of a Ni-based alloy.

[0042] According to the above fender structure, the portion of the first alloy part to which the rubber fender is connected that comes into contact with the rubber fender is made of a Ni-based alloy. This makes it possible to suppress the occurrence of crevice corrosion between the first alloy part and the rubber fender, compared to, for example, when the portion of the first alloy part that comes into contact with the rubber fender is made of stainless steel. This makes it possible to provide a fender structure with even better corrosion resistance.

[0043] <2> the above <1> In the fender structure according to the above, the first alloy part may include a first plate including the portion and a second plate, the first plate, the second plate, and the rubber fender are arranged in the order of the rubber fender, the first plate, and the second plate, the first plate overlaps the second plate, and the first plate and the second plate are made of the Ni-based alloy.

[0044] The first alloy portion includes a first plate and a second plate, each of which includes a portion that comes into contact with the rubber fender. The first plate, the second plate, and the rubber fender are arranged in the following order: rubber fender, first plate, second plate. The first plate overlaps the second plate. This allows, for example, removing the rubber fender from the installation site of the fender structure by simply removing the first plate connected to the rubber fender from the second plate. Furthermore, replacing the rubber fender with a new one can be performed by attaching the first plate connected to the new rubber fender to the second plate. This simplifies work at the installation site of the fender structure. The first plate and the second plate are made of a Ni-based alloy, which can suppress the occurrence of galvanic corrosion and crevice corrosion between the first plate and the second plate compared to when the first plate and the second plate are made of stainless steel, for example, and therefore can provide a fender structure with better corrosion resistance.

[0045] <3> the above <2> In the fender structure according to the above, a configuration may be adopted in which the first plate is attached to the second plate by a first bolt, and the first bolt is made of the Ni-based alloy.

[0046] Furthermore, the first plate is attached to the second plate by the first bolt. This allows for easy attachment and detachment of the first plate to the second plate. Furthermore, the first bolt is made of a Ni-based alloy. This makes it possible to suppress the occurrence of galvanic corrosion and crevice corrosion between the first bolt and the first and second plates, compared to, for example, when the first bolt is made of stainless steel. This allows for a fender structure with even better corrosion resistance. For example, when commercially available first bolts are used, the procurement of the first bolts can be made easier and the cost of the first bolts can be reduced.

[0047] <4> the above <2> or <3> In the fender structure according to the above, a configuration may be adopted in which one end of a stainless steel third plate is joined by welding to the side of the second plate opposite the rubber fender, and the alloy used for the welding includes a Ni-based alloy.

[0048] Furthermore, one end of a stainless steel third plate is welded to the side of the first alloy portion opposite the rubber fender on the side of the second plate. That is, the third plate is made of stainless steel. This reduces the cost of the third plate compared to when the third plate is made of a Ni-based alloy. Furthermore, the alloy used to weld the second and third plates together contains a Ni-based alloy. That is, the stainless steel third plate is welded to the Ni-based alloy second plate using a welding alloy containing a Ni-based alloy. This prevents galvanic corrosion from occurring between the second and third plates. This results in a fender structure with superior corrosion resistance.

[0049] <5> the above <4> In the fender structure according to the above, a configuration may be employed in which the other end of the third plate is connected to a member made of stainless clad steel.

[0050] The other end of the third plate is connected to a stainless clad steel member, which prevents galvanic corrosion from occurring between the stainless steel third plate and the stainless clad steel member, resulting in a fender structure with even better corrosion resistance.

[0051] <6> the above <1> from <5> In any one of the above fender structures, a configuration may be adopted in which the rubber fender and the portion are connected by a second bolt, and the second bolt is made of the Ni-based alloy.

[0052] Furthermore, the rubber fender and the portion in contact with the rubber fender are connected by a second bolt. The second bolt is made of a Ni-based alloy. This makes it possible to suppress the occurrence of galvanic corrosion and crevice corrosion between the rubber fender and the portion in contact with the rubber fender, compared to, for example, when the second bolt is made of stainless steel. This results in a fender structure with even better corrosion resistance. For example, when a commercially available second bolt is used, the procurement of the second bolt is made easier and the cost of the second bolt can be reduced.

[0053] <7> The water area structure according to one aspect of the present disclosure is <1> from <6> The present invention is characterized in that it comprises a fender structure according to any one of the above aspects.

[0054] The above-mentioned offshore structure is equipped with the fender structure according to the present disclosure, which allows the above-mentioned effects to be enjoyed in the offshore structure.

[0055] <8> The replacement method according to one aspect of the present disclosure is <2> from <5> A method for replacing the rubber fenders of a fender structure according to any one of the above aspects, characterized in that it comprises a removal step of removing the first plate to which the rubber fenders are attached from the second plate, a replacement step of replacing the rubber fenders attached to the first plate removed in the removal step with new rubber fenders, and an installation step of attaching the first plate, from which the rubber fenders have been replaced with the new rubber fenders in the replacement step, to the second plate.

[0056] According to the above replacement method, first, in the removal step, the first plate to which the rubber fenders are attached is removed from the second plate. Next, the rubber fenders attached to the first plate removed in the removal step are replaced with new rubber fenders in the replacement step. Then, the first plate, in which the rubber fenders have been replaced with new rubber fenders in the replacement step, is attached to the second plate in the installation step. By removing the first plate to which the rubber fenders are attached from the second plate in the removal step, the rubber fenders can be replaced in any location in the replacement step. Therefore, for example, it is possible to avoid replacing the rubber fenders in the replacement step in a location where it is difficult to perform the work, such as underwater. This further improves the workability and safety of the rubber fender replacement work. [Explanation of symbols]

[0057] 1 Fender structure 2 Water body structures 10 Rubber fenders 11 Mounting part 12 Buffer section 20 First Alloy Department 20A part 21 Plate 1 22 Second Plate 30 Third Plate 31 Connection board 32 Reinforcement plate 40 Fastening part 41 First Bolt 42 First Nut 43 Second bolt 44 Second Nut

Claims

1. A fender structure for ships to dock, Rubber fenders and a first alloy part to which the rubber fender is connected; and A portion of the first alloy portion that comes into contact with the rubber fender is made of a Ni-based alloy. A fender structure characterized by the above.

2. the first alloy part includes a first plate including the portion and a second plate, The first plate, the second plate, and the rubber fender are arranged in the order of the rubber fender, the first plate, and the second plate, the first plate overlaps the second plate; The first plate and the second plate are made of the Ni-based alloy.

2. The fender structure according to claim 1 .

3. the first plate is attached to the second plate by a first bolt; The first bolt is made of the Ni-based alloy.

3. The fender structure according to claim 2, wherein:

4. One end of a stainless steel third plate is welded to the second plate on the side opposite the rubber fender, The alloy used for the welding includes a Ni-based alloy.

4. The fender structure according to claim 3,

5. The other end of the third plate is connected to a member made of stainless clad steel.

5. The fender structure according to claim 4.

6. The rubber fender and the part are connected by a second bolt, The second bolt is made of the Ni-based alloy.

6. A fender structure according to any one of claims 1 to 5.

7. A fender structure according to any one of claims 1 to 5, A water structure characterized by:

8. A method for replacing the rubber fenders of the fender structure according to any one of claims 2 to 5, comprising: a removing step of removing the first plate to which the rubber fender is attached from the second plate; a replacement step of replacing the rubber fender attached to the first plate removed in the removing step with a new rubber fender; an attachment step of attaching the first plate, in which the rubber fender has been replaced with a new rubber fender in the replacement step, to the second plate; An exchange method comprising:

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