KR102428118B1 - Silt protector and construction method using the same - Google Patents

Abstract

Provided is an anti-fouling device comprising: a floating body provided to float on the water surface so as to be able to move freely while more firmly connecting floating bodies to one another; a membrane body connected to the lower end of the floating body and lowered into the water to prevent the spread of filthy water; and a connecting part for connecting floating bodies to one another. The connecting part includes: a male member installed on a facing fore-end of an adjacent floating body; and a female member into which the male member is inserted, wherein the male member includes a neck part installed on the fore-end of the floating body to extend in an axial direction and a spherical ball installed on the fore-end of the neck part, the female member includes a housing having a spherical space therein to envelop the ball and having an entrance into which the neck part is inserted, so the male member and the female member are coupled to each other by a ball joint to be able to move with respect to each other. Therefore, provided are an anti-fouling device and a construction method using the same, wherein a connected portion can be prevented from being broken.

Description

Antifouling device and construction method using the same {SILT PROTECTOR AND CONSTRUCTION METHOD USING THE SAME}

The present disclosure relates to an anti-fouling device and a construction method using the same.

In general, the antifouling device is an offshore structure installed to prevent the filthy water generated during the work process of offshore construction from spreading to the surroundings and also to induce the sedimentation of particulate matter contained in the filthy water.

The anti-fouling device includes a membrane body that prevents the diffusion of polluted water while maintaining an upright posture in the water, a floating body installed on the membrane body to support the membrane body, and an anchor for keeping the anti-fouling device at a predetermined place.

The antifouling device has a structure that is elongated by connecting a plurality of membrane bodies and floating bodies according to the size of the contamination prevention area. Membrane bodies and floating bodies frequently cause accidents such as breakage of the connection part as the load is concentrated on the connection part by the flowing current.

The floating body is a part that is greatly affected by the movement of currents such as waves and waves while floating on the water surface, and there is a problem in that the connection between the floating bodies is easily broken.

As the conventional floating body is made of Styrofoam or plastic, it is not easy to firmly and flexibly connect between the floating bodies. In addition, there is a problem of being easily deteriorated and damaged by exposure to sunlight or sea salt, thereby having a short lifespan and polluting the marine environment.

The object of the present invention is to provide an anti-fouling device and a construction method using the same to prevent the connection part from being broken by connecting the floating bodies more firmly and allowing them to move freely with each other.

An object of the present invention is to provide an anti-fouling device made of a metal material to minimize deterioration and a construction method using the same.

The object of the present invention is to provide an easy-to-construct anti-fouling device and a construction method using the same.

The antifouling device of this embodiment includes a floating body provided to float on the water surface, a membrane body connected to the lower end of the floating body and lowered into the water to prevent the spread of filthy water, and a connection part connecting the floating body and the floating body may include

The connecting portion includes a male member installed at opposite ends of the adjacent floating body and a female member into which the male member is inserted, wherein the male member is installed at the tip of the floating body and extends in the axial direction and the neck portion Including a spherical ball installed in the arm member includes a housing having a spherical space formed therein so as to surround the ball and having an inlet into which the neck is inserted at the tip end, so that the male member and the female member flow with each other It may be a ball joint-coupled structure.

The housing is divided into two hemispherical members, and each member is rotatably coupled to the tip of the floating body by a hinge shaft to open and close the inlet. may be a structure that is fixed through a bolt.

The connecting portion includes a male member installed at opposite ends of the adjacent floating body and a female member into which the male member is inserted, wherein the male member includes a rod installed at the tip of the floating body and extending in the axial direction, , The female member includes a pipe member into which the rod is inserted, the rod has at least one hole formed therethrough in an axial direction, and the pipe member is provided with a pin member for fixing the rod through the hole, and , The hole may have a relatively larger diameter than the pin member, so that the rod flows with respect to the pipe member.

The inner diameter of the tube member may be relatively larger than the outer diameter of the rod, and the rod may have a structure in which the rod is movably inserted into the tube member.

The connecting portion includes a hinge member that is formed to protrude in the axial direction from opposite ends of the adjacent floating body and engage with each other, a long hole formed in the hinge member, and a bolt inserted into the long hole to rotatably fasten the two hinge members , The floating body may be disposed vertically or horizontally with the bolts fastened to the hinge member with respect to the water surface.

The floating body may be made of a pipe made of an alloy material including a metal or aluminum alloy, and both ends of the pipe are blocked to form a closed space therein.

The anti-fouling device may further include an auxiliary buoyancy unit installed on the floating body.

The auxiliary buoyancy unit is installed on the floating body and is located on both sides of the floating body. It may include more governments.

The connecting member extends past the upper part of the floating body, and the fixing part has a bracket protruding outward from the upper end of the floating body and disposed at intervals along the floating body, and the bracket and the lower end of the central part of the connecting member are provided. A support plate in contact with each other is formed, and a fastening hole for bolting is formed through the bracket and the support plate at positions corresponding to each other. It may be a structure to be installed in

The anti-fouling device may further include a coupling unit for coupling the lower end of the floating body and the membrane body.

The coupling part comprises a pair of fixing plates disposed on both sides with the membrane body interposed therebetween to fix the membrane body, and a fixing bolt passing through a hole formed in the fixing plate to couple the membrane body and the fixing plate, the fixing plate is the floating body It extends in the axial direction of the upper end may be a structure rotatably coupled to the holding body via a hinge shaft.

The construction method of this embodiment may be a method for constructing an anti-fouling device including a floating body provided to float on the water surface and a membrane body connected to the floating body and dropped into the water to prevent the diffusion of polluted water.

The construction method may include attaching a membrane to the lower end of the float, connecting the float and the float, and mounting an auxiliary buoyancy unit on the upper portion of the float.

The step of attaching the makche may include a process of spreading a pair of fixing plates installed on the lower part of the floating body, sandwiching the makche between them, and passing a fixing bolt through a hole formed in the fixing plate to combine the makche and the fixing plate.

In the connecting step between the floats, a ball constituting a male member of a neighboring float is inserted into a hemispherical housing constituting the female member of the floating body on one side, the ball joint is coupled, and the housing is fastened with bolts to fix it. may include

The auxiliary buoyancy unit mounting step prepares an auxiliary buoyancy unit including a pair of auxiliary buoyancy members positioned on both sides of the floating body and a connecting member for connecting the pair of auxiliary buoyancy members, and the connecting member is the A pair of auxiliary buoyancy members are positioned on both sides of the floating body to pass through the upper part of the floating body, and the bracket formed protruding from the upper end of the floating body and the supporting plate formed at the lower end of the center of the connecting member are contacted, and the bracket and the supporting plate are fastened It may include a step of installing the auxiliary buoyancy member to the floating body by penetrating the bolt through the hole and coupling the support plate of the connecting member and the bracket of the floating body with the bolt.

As described above, according to this embodiment, it is possible to prevent the floating body from being easily broken by an external force by securely connecting the floating body and the floating body while freely moving it to secure fluidity against bending or rotation.

Since the floating body is made of a gold material, it is possible to further extend the lifespan and minimize environmental pollution by minimizing damage caused by salt or sunlight in the sea.

In addition, the connection between the floating bodies is easy, and necessary components such as a separate buoyancy body or a membrane body can be more easily installed.

1 is a schematic view showing an anti-fouling device according to the present embodiment.
FIG. 2 is a schematic diagram showing a connection structure of constituent parts of an anti-fouling device according to the present embodiment.
3 and 4 are schematic views showing the floating body connection structure of the anti-fouling device according to the present embodiment.
5 and 6 are schematic views showing a floating body connection structure according to another embodiment.
7 and 8 are schematic views showing a floating body connection structure according to another embodiment.

Hereinafter, embodiments of the present invention will be described in detail. However, this is presented as an example, and the present invention is not limited thereto, and the present invention is only defined by the scope of the claims to be described later. The embodiments to be described below may be modified in various forms without departing from the concept and scope of the present invention. Wherever possible, identical or similar parts are denoted by the same reference numerals in the drawings.

The terminology used below is for the purpose of referring to specific embodiments only, and is not intended to limit the present invention. As used herein, the singular forms also include the plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the following examples are only preferred examples of the present invention, and the present invention is not limited thereto.

Fig. 1 shows a contamination prevention device according to the present embodiment, and Fig. 2 shows a connection structure of components of the contamination prevention device according to the present embodiment.

Hereinafter, along the y-axis direction in FIG. 1, the upper side is referred to as upper or upper, and the lower side is referred to as lower or lower. In addition, the x-axis direction in which the float is extended is called an axial direction, and the z-axis direction is called a lateral direction or a width direction.

As shown, the anti-fouling device 10 of this embodiment is a floating body 20 provided to float on the water surface, a membrane body ( 30), and may include a connection part 50 connecting the floating body 20 and the floating body 20 . The anti-fouling device 10 may further include an anchor (not shown) for fixing the position.

The floating body 20 provides a buoyancy force to the makche 30 to support the makche 30 in a state lowered from the water surface.

The floating body 20 of this embodiment is made of a metal pipe, and both ends of the pipe are blocked to form a closed space therein. For example, the floating body 20 may be formed of a cylindrical pipe made of various metal alloy materials, such as iron, aluminum alloy, or copper alloy. The floating body 20 can be easily manufactured by welding the front end member 21 in the form of a disk provided with the connection parts 50 to both ends of the metal pipe.

Although the floating body 20 is made of a metal material, both ends are blocked and the inside is sealed so that it can float on the water surface.

In this way, since the floating body 20 is formed of a metal material, it is possible to minimize damage such as deterioration or corrosion due to sunlight or sea salt. In addition, since it is made of a metal material, it is possible to more easily install components such as the connection part 50 or the auxiliary buoyancy member.

The membrane body 30 may be made of a waterproof cloth or a nonwoven fabric having low water permeability. Makche 30 is to prevent the spread of filthy water while maintaining an upright posture in the water.

The membrane body 30 is installed connected to the lower end of the floating body 20 . A coupling portion is provided at the lower end of the floating body 20 so that the membrane body 30 can be easily installed.

As shown in Figure 2, the coupling portion of this embodiment is disposed on both sides with the membrane body 30 interposed therebetween a pair of fixing plates 22 for fixing the membrane bodies 30, through the holes formed in the fixing plate 22 It may include a fixing bolt 23 for coupling the membrane body 30 and the fixing plate 22.

The fixing plate 22 extends long along the axial direction from the lower end of the floating body 20 . Each fixing plate 22 may have a structure in which an upper end is rotatably coupled to the floating body 20 via a hinge shaft. Accordingly, by rotating the fixing plate 22, it is possible to spread or gather between them.

Therefore, it is possible to easily insert the membrane body 30 between the two fixing plates 22 in a state in which the pair of fixing plates 22 are rotated to both sides spread apart. By fastening the fixing bolt 23 to the hole formed in the membrane body 30 and the fixing plate 22 in a state in which the membrane body 30 is inserted between the fixing plates 22, the membrane body 30 to the floating body 20 is easily attached. connection can be installed.

The floating body 20 of this embodiment is made of a metal material, so it is easy to rotatably install the fixing plate 22 at the lower end as a hinge shaft, and the fixing plate 22 can be maintained in a firmly fixed state.

In addition, the anti-fouling device 10 of this embodiment may further include an auxiliary buoyancy unit 40 installed on the floating body 20 . The auxiliary buoyancy unit 40 enhances the stability of the present device while reinforcing the buoyancy force of the floating body 20 made of a metal material.

Auxiliary buoyancy unit 40 is installed on the floating body 20 and a pair of auxiliary buoyancy members 41 positioned on both sides of the floating body 20, a connecting member connecting the pair of auxiliary buoyancy members 41 (42), it may further include a fixing portion for connecting between the connecting member 42 and the floating body (20).

By installing the auxiliary buoyancy member 41 on the floating body 20 , the buoyancy of the floating body 20 can be increased. Accordingly, even if the floating body 20 is made of a metal material, it is possible to sufficiently support the membrane body 30 by securing sufficient buoyancy by the auxiliary buoyancy member 41 . In addition, as the auxiliary buoyancy member 41 is disposed on both sides in the lateral direction of the buoyancy body, it is possible to suppress the flow of the floating body 20 as much as possible and support the membrane body 30 more stably on the water surface.

The connecting member 42 extends in the width direction of the floating body 20 past the upper part of the floating body 20 . Auxiliary buoyancy members 41 are installed at both ends of the connection member 42 .

The auxiliary buoyancy member 41 is a buoyant body floating on the water surface, and its size or shape may be variously modified.

In this embodiment, the fixing part may have a structure in which the bracket 43 installed on the floating body 20 and the support plate 44 formed on the connecting member 42 are fastened with a bolt 45 to fix it.

The bracket 43 is formed to protrude upward from the upper end of the floating body 20 . The brackets 43 may be arranged and installed at intervals along the floating body 20 . A support plate 44 in contact with the bracket 43 is formed at the lower end of the central portion of the connecting member 42 . A fastening hole for fastening the bolt 45 is formed through the bracket 43 and the support plate 44 at positions corresponding to each other. Accordingly, in a state in which the support plate 44 of the connecting member 42 and the bracket 43 of the floating body 20 are in contact with the bolt 45 through the fastening hole, the auxiliary buoyancy member 41 is attached to the floating body 20 . can be easily installed on

As mentioned, the floating body 20 of this embodiment is formed of a metal material, and the bracket 43 can be firmly installed on the upper end by welding or the like. Accordingly, it is possible to easily couple the additional auxiliary buoyancy member 41 to the floating body 20 via the solidly installed bracket 43 .

In addition, the device can easily install the necessary members to the floating body 20 by using the bracket 44 . For example, as shown in FIG. 1 , the floating body 20 may be provided with a direction indicator 25 indicating a route or the like. The direction indicator 25 is provided with a coupling plate 26 having a fastening hole formed therein so that it can be fixed to the bracket 44 of the floating body 20 , and is easily fixed to the floating body 20 with a bolt or the like at a required position. can do.

3 and 4 show the structure of the connection part 50 between the floating body 20 according to the present embodiment.

As shown, the connection part 50 of this embodiment includes a male member 51 installed at opposite ends of the adjacent floating body 20 and a female member 52 into which the male member 51 is inserted. , the male member 51 and the female member 52 may have a structure in which a ball joint is movably coupled to each other.

Accordingly, it is possible to freely move up, down, left and right between the adjacent floating bodies 20 to ensure fluidity due to bending or rotation. Therefore, it is possible to prevent disconnection by firmly maintaining the connection state between the floating bodies 20 .

The male member 51 and the female member 52 are made of the same metal material as the floating body 20 and may be installed to the tip member 21 of the adjacent floating body 20 by welding or the like. Accordingly, the male member 51 and the female member 52 are firmly fixed to the floating body 20 .

In this embodiment, the male member 51 may include a neck 53 installed at the tip of the floating body 20 and extending in the axial direction and a spherical ball 54 installed at the tip of the neck 53 . . In addition, the female member 52 may include a housing 55 having an inlet 58 into which the neck 53 is inserted and forming a spherical space therein so as to surround the ball 54 .

The spherical space formed inside the housing 55 is formed with a size sufficiently larger than the diameter of the ball 54 so that the ball 54 can sufficiently flow. In addition, the inlet 58 of the housing 55 is formed to be larger than the diameter of the neck 53 and smaller than the diameter of the ball 54 . Accordingly, the ball 54 is not separated from the state inserted into the housing 55 .

As shown in FIG. 3, the housing 55 is separated into two hemispherical members (referred to as hemispherical members 56 and 57 for convenience of description below) so that the balls 54 can be easily combined. has been Each of the hemispherical members 56 and 57 is formed with a hemispherical space, and combined with each other to form a housing 55 having a spherical space.

Each of the hemispherical members 56 and 57 is rotatably coupled to the front end member 21 at the opposite end of the inlet 58 by a hinge shaft 61 . Accordingly, the inlet 58 can be opened and closed while the two hemispherical members 56 and 57 are rotated to open or gather. Accordingly, the male member 51 and the female member 52 can be coupled to each other by opening the inlet 58 to easily insert the ball 54 into the housing 55 .

A through hole 59 for fastening the bolt 60 is formed on the front end contact surface of the inlet 58 of each hemispherical member 56 and 57 . The two hemispherical members 56 and 57 may be firmly fixed through the bolt 60 fastened to the through hole 59 .

In this way, as the adjacent floating bodies 20 are connected by a ball joint, a solid connection state can be maintained while the two floating bodies 20 flow up, down, left and right.

5 and 6 show another embodiment of the connection part.

Hereinafter, the present embodiment is the same as the previously described embodiment except for the structure of the connection part 50 . Accordingly, the same reference numerals are used for the same components, and detailed descriptions thereof are omitted.

As shown in Figures 5 and 6, the connecting portion 50 is a male member 51 and the male member 51 respectively installed at the opposite ends of the adjacent floating body 20 is movably coupled that is inserted. It may include an arm member 52 .

The male member 51 of this embodiment may include a rod 62 installed at the tip of the floating body 20 and extending in the axial direction. The rod 62 may be, for example, a bar structure of circular cross-section.

In addition, the female member 52 may include a pipe member 63 into which the rod 62 is inserted. The pipe member 63 has a structure in the form of a pipe having an open tip and an empty inside. The pipe member 63 has an inner diameter relatively larger than the outer diameter of the rod 62 . Accordingly, the rod 62 is inserted into the pipe member 63, so that it can smoothly flow up, down, left and right from the inside.

The rod 62 and the pipe member 63 are formed of a metal material and may be joined to the tip member 21 of the floating body 20 made of a metal material by welding or the like.

The rod 62 and the pipe member 63 are movably connected to each other via a pin member 64 penetrating each other. To this end, a plurality of pin members 64 are installed along the pipe member 63 to pass through the center of the pipe member 63 . The rod 62 has a hole 65 through which at least the pin member 63 passes along the axial direction.

Accordingly, the pin member 64 is installed in the pipe member 63 through the hole 65 of the rod 62 to connect the rod 62 and the pipe member 63 . The pin member 64 may be, for example, a bolt. The pin member 64 may be variously deformed if it can be installed through the pipe member 63 .

As shown in FIG. 6 , in this embodiment, three pin members 64 are installed at intervals, and three holes 65 may be formed in the rod 62 to match the pin members 64 . Accordingly, even if one pin member is damaged, the other pin member maintains a binding state, thereby making it possible to firmly connect the two floating bodies 20 .

The hole 65 has a structure having a relatively larger diameter than the pin member 64 . Accordingly, in a state in which the pin member 64 penetrates the hole 65 of the rod 62 and the rod 62 and the pipe member 63 are coupled, the rod 62 smoothly moves vertically and horizontally with respect to the pipe member 63 . can be moved.

In this way, the adjacent floating bodies 20 are firmly connected by the connection part 50 and can freely flow with each other, thereby effectively maintaining the bonding state between the floating bodies 20 .

7 and 8 show another embodiment of the connection part.

Hereinafter, the present embodiment is the same as the previously described embodiment except for the structure of the connection part 50 . Accordingly, the same reference numerals are used for the same components, and detailed descriptions thereof are omitted.

7 and 8, the connecting portion 50 is formed to protrude in the axial direction from the hinge member 71 protruding from the tip of the floating body 20 on one side in the axial direction, and from the tip of the adjacent floating body 20 in the axial direction. Two hinge members 72 spaced apart from each other so that the hinge member 71 is sandwiched therebetween, a long hole 73 formed in each hinge member 71 and 72, and a hinge member 71 and 72 fitted in the long hole. It may include a bolt 74 for rotatably fastening.

The hinge members 71 and 72 formed on each floating body 20 and engaged with each other may have the same structure.

The hinge members 71 and 72 are plate structures, and a long hole 73 into which the bolt 74 is inserted is formed in the center. Accordingly, the adjacent floating bodies 20 are coupled by the bolts 74 fitted in the long holes 73 of the hinge members 71 and 72, and the two floating bodies 20 can freely rotate around the bolt 74 as an axis. can

The hinge members 71 and 72 may be formed of a metal material and joined to the tip member 21 of the floating body 20 made of a metal material by welding or the like.

The interval between the two hinge members 72 formed on one side floating body 20 is sufficiently larger than the thickness of one hinge member 71 formed on the other side floating body 20 . Accordingly, the hinge member 71 of the floating body 20 on one side may be inserted in a flowable state between the two hinge members 72 formed on the other side floating body 20 .

The long hole 73 is formed with a relatively larger inner diameter than the outer diameter of the bolt 74, and may have a structure elongated along the axial direction. Accordingly, the bolt 74 can flow in the long hole 73 , so that the two floating bodies 20 can smoothly flow vertically and horizontally.

The bolt 74 acts as a shaft through which the two floats flow. For example, the bolt 74 may pass through the long hole 73 of the hinge members 71 and 72 and be fastened through a nut.

In this embodiment, the floating body 20 may be installed by arranging the bolts 74 fastened to the hinge members 71 and 72 horizontally or vertically.

Fig. 8(a) shows a structure in which the bolts 74 are horizontally installed. In this structure, the floating body 20 may flow in a vertical direction about the bolt 74 as an axis.

Fig. 8(b) shows a structure in which the bolts 74 are vertically installed. In the case of this structure, the floating body 20 may flow in a horizontal direction about the bolt 74 as an axis.

Accordingly, it is possible to easily switch the direction of the membrane body 30 of the anti-fouling device on the water surface by bending between the floating bodies 20 in the horizontal direction.

Hereinafter, the installation process of the anti-fouling device of this embodiment will be described as follows. Hereinafter, the installation process will be described with the construction of the embodiment shown in FIG. 1 as an example.

The anti-fouling device of this embodiment may be constructed by attaching a membrane to the lower end of the floating body, connecting the floating body and the floating body, and mounting an auxiliary buoyancy unit on the upper part of the floating body.

First, for attaching the membrane, a pair of fixing plates installed on the lower part of the floating body are spread apart. Then, insert the makche between the gaping fixing plates and rotate the gaping fixing plate to its original state to pass the fixing bolt through the hole formed in the fixing plate in the state that the makche is in close contact with the makche and the fixing plate.

When a floating body is installed in a membrane body, it connects between the floating bodies. The hemispherical housing constituting the female member of the floating body on one side is rotated to widen it, and the balls constituting the male member of the adjacent floating body are inserted into the housing and the ball joint is coupled. Then, the two housings are fixed by fastening them with bolts.

When the floating body is connected, an auxiliary buoyancy unit may be further installed on the floating body.

A pair of auxiliary buoyancy members are positioned on both sides of the floating body so that the connecting member of the prepared auxiliary buoyancy part passes through the upper part of the floating body. Then, the bracket formed protruding from the upper end of the floating body and the support plate formed at the lower end of the central portion of the connecting member are in contact, and fastened with bolts. By fastening the bolt through the fastening hole formed in the bracket and the support plate, the connecting member is fixed to the floating body and the auxiliary buoyancy member can be installed in the floating body.

Although exemplary embodiments of the present invention have been illustrated and described as described above, various modifications and other embodiments may be made by those skilled in the art. All such modifications and other embodiments are intended to be contemplated and included in the appended claims without departing from the true spirit and scope of the present invention.

10: antifouling device 20: floating body
21: front end member 22: fixed plate
23: fixing bolt 25: when directing direction
26: coupling plate 30: membrane body
40: auxiliary buoyancy part 41: auxiliary buoyancy member
42: connecting member 43: bracket
44: support plate 45: bolt
50: connection part 51: male member
52: female member 53: neck
54: ball 55: housing
56,57: hemispherical member 58: entrance
59: through hole 60: bolt
61: hinge shaft 62: rod
63: pipe member 64: pin member
65: hole 71, 72: hinge member
73: long hole 74: bolt

Claims (6)

A floating body provided to float on the water surface, a membrane body connected to the lower end of the floating body and lowered into water to prevent the spread of filthy water, and a connection part connecting the floating body and the floating body,
The floating body is made of a metal pipe, and both ends of the pipe are blocked to form a closed space therein,
The connection part includes a male member made of a metal material and welded to opposite ends of adjacent floating bodies, respectively, and a female member into which the male member is inserted,
Further comprising an auxiliary buoyancy unit installed on the floating body,
The auxiliary buoyancy part is installed in the floating body and is located on both sides of the floating body. including government;
The connecting member extends past the upper part of the floating body, and the fixing part is formed with a metal bracket fixed to the upper end of the floating body by welding to protrude outwardly and disposed at intervals along the floating body, and the connecting member A support plate in contact with the bracket is formed at the lower end of the center of the bracket, and a fastening hole for bolting is formed through the bracket and the support plate at positions corresponding to each other. A structure for installing the auxiliary buoyancy member on a floating body,
Further comprising a coupling portion for coupling the lower end of the floating body and the membrane body,
The coupling part includes a pair of fixing plates disposed on both sides with the membrane body interposed therebetween to fix the membrane body, and a fixing bolt passing through a hole formed in the fixing plate to couple the membrane body and the fixing plate, the fixing plate of the floating body An anti-fouling device extending in the axial direction and rotatably coupled to the floating body via a hinge shaft. The method of claim 1,
The male member includes a neck that is installed at the tip of the floating body and extends in the axial direction, and a spherical ball installed at the tip of the neck, and the female member forms a spherical space inside to surround the ball, and has a neck at the tip. Including a housing having an inlet into which is inserted, the contamination prevention device having a structure in which the male member and the female member are movably coupled to each other by a ball joint. The method of claim 1,
The male member includes a rod installed at the tip of the floating body and extending in the axial direction, the female member includes a pipe member into which the rod is inserted, and the rod has at least one hole in the axial direction. and a pin member for fixing the rod through the hole is installed in the pipe member, and the hole has a relatively larger diameter than the pin member, so that the rod flows with respect to the pipe member. delete delete delete

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