JP2001114190A - Removing apparatus for marine organism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a removing apparatus for marine organisms which is adapted to remove deposit such as marine organisms from the wall of an underwater structure by using the natural force such as wave force and tide force without the use of chemicals, formed by many buoyancies to which a device for removing deposit is connected, and capable of efficiently removing deposit such as marine organisms by deformation and repeated collision to the wall of the underwater structure while floating. SOLUTION: This apparatus is adapted to remove marine organisms by collision of a removing device to the surface of periphery of an underwater or submarine structure while being floated, and includes plural elliptical hollow bodies or solid bodies connected to each other and a protective cover for covering the outer periphery of the hollow body or the solid body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to underwater structures (for example, steel pipe piles, H-shaped piles, square piles, concrete piles and walls, etc.) for supporting marine structures such as sea berths, artificial islands and piers.
Vertical piles, horizontal materials, diagonal materials, bridge piers, pier legs, embankments, floating piers, pontoons), hulls such as hulls and hulls (especially ships at berth, etc.), oil fences or sea fouling on shield fences Efficient removal of living organisms (shellfish such as oysters, barnacles and mussels, seaweeds) and extraneous matter such as sludge entrained or attached to them using natural forces such as wave power, wind power and tidal power The present invention relates to an apparatus for removing marine life and the like.

[0002]

2. Description of the Related Art Conventionally, the maintenance of underwater structures such as piles for supporting marine structures and the maintenance of ship bottoms are mainly performed on the surface of underwater structures and ship bottoms (shellfish, seaweed, rust, sludge, etc.). This is done by removing Such deposits promote the corrosion of the steel pipe, and the strongly attached marine organisms cause the diameter of the pipe to be distorted and increase the resistance to waves and wind.For example, when used for piers, abnormal vibrations occur. It can cause cracking and destruction. In a concrete structure, a phenomenon is observed in which marine organisms remove sulfur contained in the concrete, and the concrete structure, which appears to be strong, gradually wears out from the surface. For this reason, it is necessary to periodically remove such deposits, but this removal operation has been mainly performed by human power using a keren rod, a wire brush, or the like.

However, many of the marine structures have hundreds to thousands of installations, and work on the sea or on the water. Therefore, there are many dangers depending on weather conditions such as wave winds, tides and currents, and so on. In addition, a large number of workers, and in some cases, divers, are required, and the long-term removal work increases construction costs,
This has caused factors such as unstable work periods and unsafe work. This also applies to the work of removing extraneous matter adhering to the hull and the bottom of the hull, especially for ships. At present, maintenance work is being carried out.

[0004] Therefore, in order to avoid the need for the above-mentioned manual operation, a special paint such as a biological control agent or a substance that generates toxic ions, which makes it difficult for adherents (shellfish, seaweed, etc.) to adhere, is applied. Various methods have been devised, such as adopting a method of suppressing or killing the adhesion of marine organisms, and attaching a pile cover to protect the underwater structure, but agents such as biocontrol agents are not only used by workers but also nearby. Polluting the sea area, causing environmental pollution problems. In practice, it is impossible to prevent the marine organisms from adhering thereto, and there is a problem that it is unavoidable that the marine organisms are periodically removed manually.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above problem. (Including tidal currents and ebb and flow), so that it can move not only vertically but also in various directions, and this movement (repeated collision) removes deposits such as concrete and steel pipe piles or ship bottoms. Provided is an apparatus for removing adhering matter such as marine organisms in an underwater structure, which can be effectively removed and the attached substance removing structure can be attached along the outer shape of concrete or steel pipe pile to be removed. . In addition, the description "sea life etc."
It includes not only organisms such as shellfish, seaweeds and plankton, but also sludge or sand / gravel, rust, and other organic or inorganic substances caught or attached to them. The term "sea life" includes aquatic life or freshwater life. A similar problem occurs in an environment where aquatic substances or freshwater organisms adhere, that is, in rivers and lakes and also in freshwater mixed with freshwater and seawater, but the apparatus of the present invention described in detail below will be applied to all of them. it can. Therefore, the present invention includes these.

The inventor of the present invention has invented a buoyancy-type adhering matter removing apparatus which utilizes a wave force or a tidal force which moves up and down first (Japanese Patent Application No. Hei 9 (1994) -108686).
164374). According to this, it was found that seawater such as shellfish and seaweed adhered to concrete and steel pipe piles had an excellent adhering matter removing effect that most of them were removed within a few days. In addition, such a buoyancy-type debris removal device has been further improved to provide a relatively slow and steady debris removal effect to extend the life of the debris removal structure, and to ensure that debris is deposited over the entire marine organism deposition area. Have been also proposed (Japanese Patent Application Nos. 9-363304 and 10-188068).
In general, marine organisms such as shellfish and seaweed often attach and live near the water surface (directly above and below the water surface), and gradually increase in size, including dust and mud floating on the sea surface. The above-mentioned invention already proposed is extremely effective in removing such deposits.

The present invention is a further improvement of the above invention. In some cases, marine organisms such as shellfish and seaweed can attach and inhabit over 10 meters or more underwater,
The above-mentioned patent application has already been filed for the invention in which the adhering substance removing device is arranged in multiple stages to remove this and the invention in which a device for recovering the removed sea creatures and dead bodies is attached below the buoyant type adhering material removing device. Introduced inside. In the above invention, while improving the life of the hollow body by fitting a circular or square protective ring over the outer peripheral surface of the hollow body,
We have proposed a removal device that has a unique structure on the outer surface of the hollow body so that it can be used for rapid removal and slow removal. The present invention provides an apparatus that can remove adhering substances such as marine organisms with a more efficient and simple structure. In addition, the present invention provides a device for removing marine organisms such as underwater structures, which can reduce the frequency of replacement and removal of the device and can operate stably.

[0008]

SUMMARY OF THE INVENTION The present invention provides: 1) an apparatus for removing marine organisms while floating and colliding a removing apparatus on or around a submerged or underwater structure. An apparatus for removing marine life or the like, comprising a plurality of hollow or solid bodies to be connected and a protective cover for covering the outer periphery of the hollow or solid body. 2) The inner diameter of the protective cover is a hollow or solid body. The apparatus for removing marine organisms and the like according to the above 1), which is slightly larger than the outer diameter and is rotatably held on the outer periphery of the hollow body or the solid body. 3) The protective cover can be divided into two cups. The apparatus for removing a marine organism or the like according to the above 1) or 2), comprising a projection and a groove which can be snap-fitted to each other and which is formed in a shape of a cover. 4) At least one of the peripheral surfaces of the protective cover. Underwater or underwater The apparatus for removing sea creatures and the like according to any one of the above 1) to 3), comprising a plurality of bar-shaped projections that collide with the surface of the structure. 5) The bar-shaped projections are provided on the protective cover. The apparatus for removing marine life or the like according to any one of the above 1) to 4), wherein the apparatus is located in a plane perpendicular to the rotation direction. 6) A part or all of the bar-shaped projections can be snap-fitted. The apparatus for removing marine life or the like according to any one of the above 1) to 5), wherein the positions of the projections and the groove portions are aligned on the same line. 7) The hollow body or the solid body is interconnected to both side surfaces. The apparatus for removing a marine organism or the like according to any one of 1) to 6) above, further comprising ears for making the hollow body have ears on both sides of the hollow body on surfaces orthogonal to each other.

The present invention further provides: 8) an apparatus for removing marine organisms or the like according to any one of 1) to 7) above, wherein the apparatus has an openable / closable hole communicating with the inside of the hollow body. Adjacent hollow bodies or solid bodies are connected to each other by mechanical means such as bolts and nuts, and the length between these ears from the ear mounting part of the hollow body or solid body to the binaural connection part The apparatus for removing marine life and the like according to each of the above 1) to 8), wherein the apparatus is provided with a circular stopper plate having a radius of approximately 10) 10) The hollow body or the solid body is around an underwater or undersea structure 1) characterized in that they are arranged in a ring shape in
9) The apparatus for removing sea creatures and the like according to each of 9) 11) A hollow body or a solid body that is connected to each other and floats on the water surface or the sea surface, and is suspended from the hollow body or the solid body via a connecting tool such as a chain. The apparatus for removing sea creatures and the like according to any one of the above 1) to 10), comprising a plurality of removal tools floating in water or in the sea and connected to each other. The apparatus for removing marine organisms or the like according to the above 10), further comprising a buoy coupled to the actual connector 13) A plurality of hollow or solid bodies connected to each other and floating on the water surface or the sea surface The above 1) characterized in that a net is provided below the removal tool connected in a chain so as to house marine organisms and the like that are vertically provided via a connection tool such as a chain.
14) The apparatus for removing marine organisms and the like according to each of the items 12) to 14) A plurality of hollow bodies or solid bodies connected to each other floating on the water surface or the sea surface around the flank of the hull, and one of the hollows on both sides of the hull (1) to (13) above, which are provided with one or a plurality of chain-connected removing tools which are connected to a body or a solid body and pass under the ship bottom to be connected to the other hollow body or the solid body. ), A device for removing marine organisms and the like attached to a ship described in each of the above items.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of one hollow body 1 constituting the apparatus for removing marine organisms and the like according to the present invention. As shown in the figure, the shape of the hollow body 1 is an ellipsoid (a squash or a pillow). Each hollow body is left-right symmetric except for a connecting portion described later. The inside of the hollow body 1 literally forms a hollow portion 2 (within a dotted line in FIG. 1). The hollow body 1 is preferably manufactured by blow molding, but may be manufactured by another method. Since the removal device comes into contact with and removes marine organisms such as marine structures while floating on or below the sea surface, it is desirable that the removal device itself has buoyancy. Therefore, the removal device is preferably a hollow body, but may be a solid body. When buoyancy is insufficient, buoys or the like can be used to improve buoyancy. In the following, description will be made mainly using a hollow body as a representative example.

On both sides of the hollow body 1, ears 3 and 4 for connecting the individual hollow bodies (the "ears" used in the specification).
Means ear-like projections and does not mean the ears of the organism responsible for hearing). The ears 3 and 4 are provided with holes 3-1 and 4-1 respectively, and a fixing tool such as a bolt is inserted into the holes 3-1 and 4-1 to connect adjacent hollow bodies 1 to each other (link connection). ). The method of fixing the adjacent hollow bodies 1 may be loosely tightened so as to be rotatable with each other, or may be tightly tightened so as to be held at a fixed angle with each other.

As shown in FIG. 1, the ears 3, 4 lie on planes which intersect at right angles to each other. When the hollow bodies 1 are connected in this manner, the adjacent hollow bodies 1 can rotate (rotate) with each other, but the rotation of the next hollow body 1 (every other one) in the same direction is prevented. (Because the direction is a right angle direction). Thus, when the hollow body 1 is connected in a ring shape, for example,
There is an effect that a ring-like shape can be almost maintained without accompanying uneven deformation. On the other hand, if the ears 3 and 4 are on the same plane, they rotate in one direction, and when connected in a ring shape, they may be deviated in a specific direction due to a wave force or the like. However, since the hollow body 1 joined in a ring shape bends at random, there is no particular problem if a long-term removal operation is performed until the removal is completed. And 4 are on the same plane.

The ears 3 and 4 of the adjacent hollow body 1 need to have their overlapping surfaces exactly on the center line.
The ears 3 and 4 of each hollow body 1 are provided at positions such that one side thereof is located at the center line in consideration of its thickness. The main purpose of the solid or hollow body is to remove sea creatures by floating on the sea surface or the like. In particular, the hollow body 1 is provided with a hole that can be opened and closed (not shown) and is provided in the space 2. It is also possible to inject water, submerge and submerge in the sea or in the water, and remove underwater marine organisms in underwater structures. In the case of functioning only in the removal operation in water, the holes can be left open from the beginning. The above “openable / closable hole” includes this meaning.

If a hard material is used as the material of the hollow body or the solid body, the hollow body or the solid body itself has a function of removing marine organisms and the like. However, in order to avoid abrasion of the hollow or solid body, it is used with a protective cover described later. As the hollow or solid material, it is preferable to use a resin such as polypropylene, polyethylene, nylon, Duracon, or hard rubber. However, materials other than these resins may be used. The properties required for these materials are:
It is a material that has good formability, has a role as a buoyant body, has abrasion resistance, removes deposits such as shells and seaweed, but can avoid abrasion of underwater structures such as steel pipes and concrete. You are only restricted.

FIG. 2 and FIG. 3 show that a hollow body or solid body 1 (hereinafter, the hollow body or solid body has the same function, so the same reference numeral 1 is used) has a slight clearance on the outer peripheral surface. 5 shows a protective cover 5 that fits. This protective cover 5 is one of the major features of the present invention. The inner diameter of the protective cover 5 is slightly larger than the outer diameter of the hollow or solid body 1 and is rotatably held on the outer periphery of the hollow or solid body 1. The protective cover 5 comprises two cup-shaped protective cover portions 5-1 and 5-2 which can be divided, and has a projection 6 and a groove 7 which can be snap-fitted to each other. The bottom of the cup of the protective cover is provided with a hole 8 through which both the hollow and solid ears 3, 4 can be inserted.

Two cup-shaped protective cover parts 5-1 and 5
-2, facing each other, inserting through the both ears 3, 4 of the hollow body or the solid body 1, respectively, and then fitting the above-mentioned projections and grooves into each other to join them together. Thereby, the protective cover 5 covers almost the entire hollow or solid body 1 and completes the assembly of the individual removing devices which can be freely rotated. As is clear from the figure, the protective cover 5 rotates on the hollow or solid body 1 but hardly moves left and right. This protective cover performs direct and repeated removal operations on the surface of underwater or underwater structures, that is, marine organisms and the like. As the material of the protective cover 5, it is preferable to use the same material as the hollow or solid body 1, that is, a resin such as polypropylene, polyethylene, nylon, Duracon, or hard rubber. However, materials other than these resins may be used.

The two cup-shaped protective covers 5-1 and 5
-2 may be snap-fitted and then welded together for a strong connection. Especially in the rough ocean,
Simply by snap-fitting, welding may be effective in such a case, since it may come off particularly in the open sea with rough waves. After attaching the protective cover 5 to the hollow body or the solid body 1, as shown in FIG. 2, the adjacent hollow body or the solid body 1 is connected to each other using the connecting bolt 9. Code 9
Reference numeral 9-2 indicates a washer. A series of connected hollow bodies (which appear to be chain-like when viewed from a distance) or solid bodies 1
Over the sea surface around the offshore structure, etc., and finally connect both ends of a series of hollow bodies or solid bodies 1 that are connected in a chain, and complete the removal device for marine organisms etc. arranged in an annular shape I do. Thereafter, movements such as up and down are freely and uniformly repeated by wave force or the like, thereby effectively removing marine life and the like.

At least a portion of the peripheral surface of the protective cover 5
A plurality of bar-shaped projections 10 are provided which collide with the surface of an underwater or underwater structure. The bar-shaped projection 10 is provided with the protective cover 5.
It is good to be in the plane perpendicular to the direction of rotation of. Furthermore, if the positions of the projections 6 and the groove portions 7 that can be snap-fitted are partially or entirely aligned with the same line, the projections 10 with high strength are provided without structural waste. A protective cover 5 can be formed. The bar-shaped projection 10 irregularly rotates around the hollow body or solid body 1 while colliding with the surface of a marine organism or an underwater structure with the vertical movement of the removal device floating on the sea surface due to wave force or the like. Thus, marine life can be more effectively removed.

During the initial removal of marine organisms, the marine organisms are firmly attached to the surface of the underwater or underwater structure, and it is very difficult to remove them by hand or the like. The role of seawater removal is great. Of course, in the protective cover, the bar-shaped projection 10 is most worn,
Even if the bar-shaped projection 10 is worn and disappears, the protection cover 5
Even when used alone, it has the effect of removing marine organisms. Further, even if the protective cover 5 is worn out and disappears, the hollow body or the solid body 1 itself has the ability to remove marine organisms and the like, and can effectively remove marine organisms and the like. It is efficient to replace the protective cover 5 with a new one when the protective cover 5 is worn out, but most of the marine organisms have already been removed at the time of normal replacement.

FIG. 3 shows a hollow or solid body 1 with a ring.
A structure in which removing devices 11 and 12 similarly connected in a ring shape at the lower part thereof are arranged in upper and lower stages. For convenience of explanation, FIG. 3 shows a two-stage example,
A structure provided only on the sea surface, that is, a single-stage structure or a multi-stage structure may be employed. In FIG. 3, the sea surface is not shown, but the position where the upper hollow body or solid body 11 is linked corresponds to the sea surface position. Thus, the removal tool 12 is below sea level. Although the structure of the hollow body or solid body 1 is not shown in detail in FIG. 3, it has the same protective cover structure as that of FIG.

Reference numeral 13 denotes a steel pipe pile. In FIG. 3, the diameter of the steel pipe pile 13 is reduced so that the ring 11 of the hollow body or the solid body 1,
12 is easy to see, but if the diameter of the rings 11 and 12 of the hollow body or the solid body 1 is too small, the friction between the hollow body or the solid body 1 and the object to be removed increases, and the collision should be repeated due to wave force or the like. The movement of the hollow body or solid body 1 becomes poor, and the removal efficiency is reduced or stopped. On the other hand, if the diameters of the rings 11 and 12 of the hollow body or the solid body 1 are too large, the contact efficiency between the rings 11 and 12 of the hollow body or the solid body 1 and the object to be removed is small, and the removal efficiency is reduced. Therefore, the diameters of the rings 11 and 12 need to be appropriately adjusted according to the thickness of the deposit, the diameter of the steel pipe pile 13 and the wave height.

As shown in FIG. 3, a ring 12 in which a hollow body or solid body 1 below the sea surface is connected in a ring shape is suspended via a suspending device 14 such as a chain or a wire which is suspended from the ring 11. The hollow body or solid body 1 of the ring 12 can be used, for example, by removing gas (air) inside the hollow body 1 and adding water, or by using a solid body to limit buoyancy to some extent. Can also be used. Since the structure of the hollow body can be used as a structure that enhances buoyancy, and can be used by immersing water, it can be used very effectively. The ring 11 takes on the weight of the ring 12 and the chains, wires, etc., which are suspended to suspend them, but a buoy 15 may be provided as appropriate. The buoy is made of foamed plastic, preferably has a hollow interior and is manufactured by an injection molding method. However, a buoy manufactured by another material or method can be used.

FIG. 4 shows the structure of the hollow or solid body 1 used in the ring 12. The structure of the hollow or solid body 1 is the same as that used for the ring 11,
The only difference is that the vertical chain 16 and the vertical bracket 17 are connected to appropriate portions of the ring 12. in this way,
By installing the removal device in two stages, it is possible to remove marine life in a wide area below and above the sea surface. Although not shown, a structure may be employed in which a net for collecting the removed marine organisms and the like is attached below the rings 11 and 12.

FIG. 5 shows an example in which marine organisms such as shellfish and seaweed firmly attached to a ship's side or bottom are effectively removed within a short time. FIG. 5A is a conceptual explanatory view of the present apparatus viewed from above, and FIG. 5B is a cross-sectional view. The symbol WL indicates a water surface. A hollow body or solid body 1 connected in a chain and floating on the water surface or sea surface around the side of the hull of the hull 20 is arranged, and connected to either one of the hollow body or solid body 1 on both sides of the hull, and And one or a plurality of chain-connected removal devices 21 that are connected to the other hollow body or solid body 1 by passing through. On the outer peripheral surface of the hollow or solid body 1, a protective cover 5 is attached in the same manner as described above. The alternate long and short dash line shows the arrangement of the hollow body or solid body 1 connected in a chain and the removing device 21. The removing device 21 shown in FIG. 5 has the same structure as the hollow body 1 or the solid body into which water has been removed and water has been injected so as to float in water, similarly to the device shown in FIG. Can be used.

Buoys 19 can be provided at appropriate locations on the hollow or solid body 1 connected in a chain to further improve buoyancy. A rope 22 is attached to the bow and stern,
By adjusting this length, the positioning of the hollow body or solid body 1 connected in a chain and the repeated collision with the hull are made possible. In such an apparatus of the present invention, waves or winds hitting the hull 20 may cause the hollow body or the solid body 1 attached with the protective cover 5 connected in a chain shape floating on the sea surface to irregularly deform and collide with the ship's side. In addition, one or a plurality of removal devices 21 connected to the bottom of the ship in a chain form repeat irregular movement and collision with the bottom of the ship, thereby removing sea life and the like adhering to the side and bottom of the ship. It can be effectively removed.

A hollow or solid body 1 provided with a protective cover 5
Are linked to adjacent hollow bodies or solid bodies 1 so that the connected hollow bodies or solid bodies 1 can be deformed with certain restrictions around the underwater structure.
The limitation of this deformation is that the direction of the link (the direction of the ear for connection) of the hollow body or the solid body 1 is changed every other body. Accordingly, the connected hollow body or solid body 1 is not deformed indefinitely, but has a characteristic that, for example, if the whole is a ring shape, it is deformed while maintaining its shape to some extent. Therefore, useless movement of the solid body or the hollow body 1 is eliminated, and the removal effect can be increased.

[0027]

The present invention mechanically removes sea creatures using natural forces such as wind power, wave power, and tide power without using chemicals, etc., within a certain range linked by a link mechanism. Provide a rotatable hollow body or solid body to improve buoyancy and at the same time eliminate unnecessary movement, and place a protective cover on the outer peripheral surface of the hollow body or solid body to contact and collide with underwater structures or ship flank or ship bottom Extends the life of adhering material removal equipment, reduces the frequency of replacement and removal of equipment, enables stable operation of removing adhering materials, and works not only for underwater structures such as vertical piles, but also for structures that extend horizontally or diagonally. Alternatively, it has an excellent effect that marine organisms such as shellfish and seaweed firmly adhered to a ship's side or bottom can be effectively removed within a short time. Since the protective cover has a structure that can be divided into two, it can be easily attached to a hollow or solid body, and by providing a bar-shaped projection on this protective cover, the impact force against marine life and the like can be increased. The removal effect can be further enhanced. Furthermore, an apparatus for removing deposits such as marine organisms submerged below the water surface is provided, and the collisions are repeated simultaneously with the vicinity of the water surface and the deposits existing under the water to remove them, and the water is spread over almost the entire area of the underwater structure. It has an excellent effect of effectively removing marine organisms such as shellfish and seaweed that have firmly adhered within a short time.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a hollow body constituting an apparatus for removing marine organisms and the like according to the present invention.

FIG. 2 is an explanatory view showing a state of assembling a hollow body or a solid body provided with a protective cover.

FIG. 3 is a schematic explanatory view of a two-stage marine organism removing device in which hollow bodies or solid bodies are connected and arranged around a marine structure (pile).

FIG. 4 is an explanatory diagram showing a state of assembling a hollow body or a solid body in a removing device arranged below.

FIG. 5 is a conceptual explanatory view of an example in which the apparatus of the present invention removes attached sea creatures such as a ship flank and a ship bottom. FIG. 5 (A) is an explanatory view seen from above, and FIG. 5 (B) is a sectional view thereof. .

[Explanation of symbols]

 1: hollow body or solid body 2: hollow part 3, 4: ear 5: protective cover 6: projection 7: groove 8: hole 9: bolt 10: bar-shaped projection 11: upper ring 12: lower ring 13: Steel pipe pile 14: Chain, wire, etc. 15: Buoy 16: Vertical chain 17: Vertical bracket 18: Bolt 19: Buoy 20: Hull 21: Removal device 22: Rope

Claims (7)

[Claims] 1. An apparatus for removing a marine organism or the like while floating and colliding a removal apparatus on or around an underwater or underwater structure, comprising a plurality of oblong spherical or solid bodies connected to each other. An apparatus for removing marine organisms and the like, comprising a protective cover for covering the outer periphery of the hollow or solid body. 2. The sea according to claim 1, wherein the inner diameter of the protective cover is slightly larger than the outer diameter of the hollow body or the solid body, and is rotatably held on the outer periphery of the hollow body or the solid body. Biological removal equipment. 3. The marine life or the like according to claim 1, wherein the protective cover comprises two cup-shaped covers which can be divided, and has a projection and a groove which can be snap-fitted to each other. Removal equipment. 4. At least a part of the peripheral surface of the protective cover,
The apparatus for removing marine organisms and the like according to any one of claims 1 to 3, further comprising a plurality of bar-shaped projections that collide with the surface of the underwater or underwater structure. 5. The apparatus for removing marine organisms and the like according to claim 1, wherein the bar-shaped projections are in a plane perpendicular to the rotation direction of the protective cover. 6. The method according to claim 1, wherein a part or all of the bar-shaped projections, the positions of the projections and the groove portions which can be snap-fitted are aligned on the same line. Equipment for removing marine life. 7. The hollow body or the solid body further comprises ears for connecting to both sides of the hollow body, and the ears on both sides of the hollow body are on surfaces orthogonal to each other. The apparatus for removing marine organisms and the like according to each of the above.