Motion suppression member and motion suppression member installation method

Abstract

To provide an oscillation suppression member capable of downsizing manufacturing space for manufacturing a floating body, improving work efficiency, and furthermore suppressing transportation expense for the floating body.SOLUTION: An oscillation suppression member 10A is provided on a side face 2 of a floating body 1A moored in a state of floating on the water surface includes: a flat plate 20 overhanging from the floating body 1A; and a strut 30 with a top end unit coupled to the floating body 1A and a bottom end unit coupled to the flat plate 20. An inner end unit of the flat plate 20 and a top end unit of the strut 30 are coupled respectively to the floating body 1A by a bottom unit hinge 50 and a top unit hinge 60. The strut 30 and the flat plate 20 are capable of being revolved in the vertical direction to a side surface of the floating body 1A in a state of having the coupling released between a bottom end unit of the strut 30 and the flat plate 20.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a motion suppression member and a method for installing the motion suppression member. [Background technology]

[0002] Floating bodies such as barge-type and semi-submersible-type bodies used as the foundations of offshore wind power generation systems are moored in a floating state on the water, such as on the ocean or on a lake. Patent Document 1 discloses that motion suppression plates are provided on the sides of a floating body to reduce motion of the floating body caused by waves and wind. The motion suppression plates protrude laterally from the sides of the float and are placed underwater when the float is floating on the water. Vortices are generated around the motion suppression plates due to fluid motion, which increases the damping of the float and reduces the motion of the float. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-058691 Summary of the Invention [Problem to be solved by the invention]

[0004] When a float having the motion suppression plates described above is fabricated on land, the space required for fabrication is large because the motion suppression plates protrude from the sides of the float. Furthermore, when a float is fabricated on land, if a motion suppression plate protrudes from the side of the float, it becomes difficult to bring a work crane close to the side of the float, reducing work efficiency. Furthermore, when the manufactured float is loaded onto a barge and transported to the installation site on the water, if the motion suppression plates protrude from the sides of the float, a large loading space is required on the barge, which may result in the barge becoming larger and the transportation costs increasing.

[0005] The present invention aims to solve the above-mentioned problems, reduce the manufacturing space required when manufacturing a float, improve work efficiency, and further provide a motion suppression member and an installation method for the motion suppression member that can reduce the transportation costs of the manufactured float. [Means for solving the problem]

[0006] To solve the above problems, the first invention is a motion suppression member provided on the side of a float moored on water, the member comprising: a flat plate extending laterally from the side of the float; and a strut having an upper end connected to the side of the float and a lower end connected to the flat plate. The inner end of the flat plate and the upper end of the strut are each connected to the side of the float by hinges. When the connection between the lower end of the strut and the flat plate is released, the strut and the flat plate can rotate up and down relative to the side of the float. In a first configuration of the first invention, a plurality of the flat plates and a plurality of the struts are arranged side by side in the horizontal direction, and each strut is connected to each of the flat plates, and adjacent flat plates are connected by connecting members. In a second configuration of the first invention, beam members protruding sideways from the lower ends of the struts support the undersides of the flat plates. To solve the above problem, the second invention provides a method for installing the motion suppression member on the side of the float. With the strut and the flat plate disconnected, the strut and the flat plate are rotated upward and placed on the side of the float. Then, with the float floating on the water, the strut and the flat plate are rotated downward to spread out to the side of the float, and the lower end of the strut is connected to the flat plate.

[0007] In the present invention, a truss structure is formed by the side surface of the floating body, the flat plate, and the struts, so that the rigidity of the motion suppression member against water pressure and wave pressure acting on the flat plate can be increased. In the present invention, when the float is fabricated on land, the struts and flat plates are stacked on the sides of the float, thereby reducing the fabrication space required for the float compared to when the flat plates protrude from the sides of the float. Furthermore, in the present invention, when the float is fabricated on land, the struts and flat plates are stacked on the side of the float, which allows the work crane to approach close to the side of the float, thereby improving work efficiency. In the present invention, when transporting the fabricated floating body to the installation location on the water by placing it on a mother ship, the loading space of the mother ship can be reduced by stacking the struts and flat plates on the side surface of the floating body, so that the mother ship can be downsized and the transportation cost can be reduced.

[0008] In the above-described shaking suppression member, a plurality of the flat plates and a plurality of the struts are arranged side by side in the lateral direction, and each of the struts is connected to each of the flat plates. Because The shaking of the floating body on the water can be effectively reduced. In the above-described shaking suppression member, adjacent flat plates are connected by a connecting member. Because The rigidity of each flat plate against water pressure and wave pressure can be increased. but This can be achieved. In the above-described shaking suppression member, when a plurality of the struts are connected to one flat plate, a plurality of truss structures are formed for one flat plate, so that the rigidity of the shaking suppression member against water pressure and wave pressure can also be increased. In the above-described shaking suppression member, when the lower end of the strut is connected to the upper surface of the flat plate by a pin joint, the strut and the flat plate can be easily connected on the water. In the above-described shaking suppression member, the lower surface of the flat plate is supported by a beam member protruding laterally from the lower end of the strut. Therefore, The flat plate can be connected to the strut in a stable state. The floating body is applicable to a barge type or a semi-submersible type.

Advantages of the Invention

[0009] In the shaking suppression member and the installation method of the shaking suppression member of the present invention, the rigidity against water pressure can be increased, the floating body can be easily manufactured, and further, the transportation cost when transporting the floating body to the installation location on the water can be reduced.

Brief Description of the Drawings

[0010] [Figure 1]It is a plan view showing a floating body having a motion suppression member according to a reference example of the present invention. [Figure 2] It is a side view showing a motion suppression member according to a reference example of the present invention. [Figure 3] It is a plan view showing a motion suppression member according to a reference example of the present invention. [Figure 4] In the motion suppression member according to the reference example of the present invention, it is a side view of a state where a flat plate and struts are overlapped on the side surface of a floating body. [Figure 5] It is a view showing a modified example of the motion suppression member according to the reference example of the present invention, and is a plan view of a configuration in which a plurality of struts are connected to a single flat plate. [Figure 6] It is a view showing a motion suppression member according to the first embodiment of the present invention, and is a plan view of a configuration in which adjacent flat plates are connected. [Figure 7] It is a plan view of a configuration in which the motion suppression member according to the reference example of the present invention is applied to a semi-submersible type floating body. [Figure 8] It is a side view showing a motion suppression member according to the second embodiment of the present invention. [Figure 9] It is a plan view showing a motion suppression member according to the second embodiment of the present invention. [Figure 10] In the motion suppression member according to the second embodiment of the present invention, it is a side view of a state where a flat plate and struts are overlapped on the side surface of a floating body.

Embodiments for Carrying Out the Invention

[0011] Embodiments of the present invention and reference examples will be described in detail with reference to the drawings as appropriate. In the description of each embodiment and reference examples the same reference numerals will be given to the same components, and duplicate descriptions will be omitted.

[0012] Reference example FIG. 1 is a plan view showing a floating body having a motion suppression member according to the present invention. Reference example Reference example ​​As shown in FIG. 1, the motion suppressing member 10A is provided on the side of a barge-type floating body 1A. The float 1A is a hollow concrete or steel box that serves as the foundation member of an offshore wind turbine. The float 1A is moored while floating on the water, such as on the ocean or a lake. At this time, the lower part of the side surface 2 of the float 1A is placed underwater. The floating body 1A is substantially rectangular in plan view, and a plurality of motion suppression members 10A are provided on each of the four side surfaces 2 (front, rear, left, and right). Reference example In the figure, four motion suppression members 10A are arranged side by side in the horizontal direction on each side surface 2 of a floating body 1A.

[0013] FIG. 2 shows the structure of the present invention. Reference example FIG. 2 is a side view showing the vibration suppression member according to the embodiment; As shown in Figure 2, the motion suppression member 10A comprises a flat plate 20 extending laterally from the side surface 2 of the floating body 1A, and a strut 30 whose upper end is connected to the side surface 2 of the floating body 1A and whose lower end is connected to the flat plate 20. FIG. 3 shows the structure of the present invention. Reference example FIG. 2 is a plan view showing the vibration suppression member according to the embodiment; Reference example As shown in FIG. 3, four flat plates 20 are arranged side by side in the horizontal direction on the side surface 2 of a floating body 1A, and four struts 30 connected to each flat plate 20 are also arranged side by side in the horizontal direction.

[0014] The flat plate 20 is a metal or concrete plate that is rectangular in plan view. As shown in Fig. 2, the flat plate 20 is arranged so that both flat surfaces form the upper surface 21 and the lower surface 22, and protrudes laterally from the side surface 2 of the floating body 1A. The flat plate 20 is arranged horizontally, with the normals of the upper surface 21 and the lower surface 22 oriented vertically. As shown in Fig. 3, the flat plate 20 is connected to the side surface 2 of the floating body 1A via a hinge. Specifically, the inner end portion (the edge portion on the floating body 1A side) of the flat plate 20 is connected to the side surface 2 of the floating body 1A by two lower hinges 50, 50. FIG. 4 shows the method of the present invention. Reference example 1 is a side view of the motion suppression member of the present invention, in which the flat plate and the strut are superimposed on the side surface of the floating body. The lower hinge 50 has a pin 51 whose axial direction is the width direction (horizontal direction) of the flat plate 20. When the connection between the strut 30 (described later) and the flat plate 20 is released, the flat plate 20 can rotate up and down relative to the side surface 2 of the floating body 1A with the pin 51 as the rotation axis, as shown in Figure 4. In addition, when the connection between the strut 30 and the flat plate 20 described below is released, a stopper (not shown) is provided on the lower hinge 50 to prevent the flat plate 20 from tilting downward from the horizontal (to maintain the state of the flat plate 20 in Figure 2).

[0015] As shown in Fig. 2, the strut 30 is a cylindrical member made of metal. The upper end of the strut 30 is connected to the side surface 2 of the floating body 1A via a hinge. Specifically, the upper end of the strut 30 is connected to the side surface 2 of the floating body 1A by an upper hinge 60. In addition, Reference example The struts 30 are made of metal, but the material is not limited thereto. For example, the struts may be made of concrete such as prestressed concrete. Reference example The struts 30 are cylindrical members with a circular axial cross section, but the shape is not limited thereto. For example, the struts may have a rectangular or triangular axial cross section. The upper hinge 60 has a pin 61 whose axial direction is the width direction (horizontal direction) of the flat plate 20. When the connection between the strut 30 and the flat plate 20 is released, as shown in Figure 4, the strut 30 can rotate in the vertical direction relative to the side surface 2 of the floating body 1A with the pin 61 as the rotation axis.

[0016] As shown in Figure 2, the lower ends of the struts 30 are connected to the upper surface 21 of the flat plate 20 via connecting fittings 70. As shown in Figure 3, the lower ends of the struts 30 are connected to the outer end of the upper surface 21 of the flat plate 20 at the center in the width direction. 2, the connecting fitting 70 has a first bracket 71 provided at the lower end of the strut 30, a second bracket 72 provided on the upper surface of the flat plate 20, and a pin 73 whose axial direction is the width direction (horizontal direction) of the flat plate 20. The pin 73 is inserted into holes formed in the first bracket 71 and the second bracket 72. In this way, first bracket 71 and second bracket 72 are connected by pin 73, so that the lower end of strut 30 is connected to upper surface 21 of flat plate 20. Then, by pulling pin 73 out of first bracket 71 and second bracket 72, the connection between strut 30 and flat plate 20 can be released (see FIG. 4).

[0017] Next, the above Reference example A method for installing the motion suppressing member 10A on the side of the floating body 1A on the water will be described. First, when fabricating the floating body 1A on land, as shown in Figure 4, the connection between the lower end of the strut 30 and the flat plate 20 is released, and the strut 30 and the flat plate 20 are rotated upward to overlap the side surface 2 of the floating body 1A. The strut 30 and the flat plate 20 are fixed in an overlapping state to the side surface 2 of the floating body 1A using fixing devices such as fixing brackets and wires (not shown) provided on the side surface of the floating body 1A. After the float 1A is fabricated with the struts 30 and flat plates 20 superimposed on the side surface 2 of the float 1A, the float 1A is loaded onto a barge and transported to an installation site on the water. At the installation site on the water, the floating body 1A is lowered from the barge and floated on the water. Then, as shown in Figure 2, the struts 30 and flat plate 20 are released from the side surface 2 of the floating body 1A, and the struts 30 and flat plate 20 are rotated downward, spreading the struts 30 and flat plate 20 out to the side of the floating body 1A. At this time, the flat plate 20 is maintained in a horizontal position by a stopper (not shown) of the lower hinge 50. Then, pins 73 are inserted into the holes in the first bracket 71 and the second bracket 72 of the connecting fitting 70 to connect the lower ends of the struts 30 to the upper surface of the flat plate 20 .

[0018] In the vibration damping member 10A and its installation method as described above, as shown in FIG. 2, when the floating body 1A is floating on the water, vortices are generated by fluid motion around the flat plate 20 provided on the side surface of the floating body 1A, and the damping of the floating body 1A is increased, so that the vibration of the floating body 1A can be reduced. In addition, since a truss structure is formed by the side surface 2 of the floating body 1A, the flat plate 20, and the strut 30, the rigidity of the vibration damping member 10A against the water pressure and wave pressure acting on the flat plate 20 can be increased. In addition, since the lower end portion of the strut 30 is connected to the upper surface of the flat plate 20 by a pin joint, the strut 30 and the flat plate 20 can be easily connected on the water.

[0019] In addition, as shown in FIG. 4, when the floating body 1A is manufactured on land, by stacking the strut 30 and the flat plate 20 on the side surface 2 of the floating body 1A, the manufacturing space of the floating body 1A can be reduced, and the working crane can be brought close to the vicinity of the floating body 1A, thereby improving the working efficiency. In addition, when the manufactured floating body 1A is placed on a barge and transported to an installation location on the water, by stacking the strut 30 and the flat plate 20 on the side surface 2 of the floating body 1A, the loading space of the barge can be suppressed, so that the barge can be miniaturized and the transportation cost can be suppressed.

[0020] As described above, the present invention Reference example has been described, but the present invention is not limited to the above Reference example and can be appropriately changed without departing from the gist thereof. Reference example In the figure, as shown in FIG. 1, four vibration damping members 10A are provided on one side surface 2 of the floating body 1A. However, the number and arrangement of the vibration damping members 10A are not limited, and the shapes and sizes of the strut 30 and the flat plate 20 are not limited either. The shape and number of the vibration damping members 10A are set according to the shape and weight of the floating body 1A so that the vibration of the floating body 1A can be easily reduced. Reference exampleIn the motion suppression member 10A, as shown in FIG. 2, the lower end of the strut 30 and the upper surface of the flat plate 20 are connected by a pin joint, but the method of connecting the strut 30 and the flat plate 20 is not limited, and they may be connected using bolts, for example. FIG. 5 shows the method of the present invention. Reference example FIG. 10 is a plan view showing a modified example of the vibration suppression member in accordance with the embodiment, in which a plurality of struts are connected to a single flat plate. Reference example In the motion suppression member 10A, one strut 30 is provided on one flat plate 20, but as shown in Fig. 5, multiple struts 30 may be connected to one flat plate 20. In this configuration, multiple truss structures are formed on one flat plate 20, which can increase the rigidity of the motion suppression member 10A against water pressure and wave pressure. FIG. 6 is a diagram illustrating a vibration suppression unit according to a first embodiment of the present invention. Materials In the figure shown, this is a plan view of a configuration in which adjacent flat plates are connected. As shown in FIG. 6, two adjacent flat plates 20, 20 are connected by a connecting member 40, thereby increasing the rigidity of each flat plate 20 against water pressure and wave pressure. but can. FIG. 7 shows the method of the present invention. Reference example FIG. 1 is a plan view of a configuration in which the motion suppression member according to the present invention is applied to a semi-submersible floating body. Reference example As shown in Figure 1, a motion suppression member 10A is provided on a barge-type floating body 1A, but the structure of the floating body 1A to which the motion suppression member 10A can be applied is not limited.For example, as shown in Figure 7, multiple motion suppression members 10A may be arranged on the side of a semi-submersible floating body 1B having a truss structure or a rigid frame structure.

[0021] [Second embodiment] Next, a motion suppression member 10B according to a second embodiment and a method for installing the member will be described. FIG. 8 is a side view showing a motion suppression member according to the second embodiment of the present invention. As shown in FIG. 8, the motion suppression member 10B of the second embodiment has the following features: Reference exampleThe vibration suppression member 10A has a configuration substantially similar to that of the vibration suppression member 10A (see FIG. 2), but differs in the connection structure between the lower end of the strut 30 and the upper surface of the flat plate 20.

[0022] FIG. 9 is a plan view showing a motion suppression member according to the second embodiment of the present invention. As shown in FIG. 9, a depression 25 is formed in the center of the outer edge of the flat plate 20 of the motion suppression member 10B of the second embodiment, depression 25 being recessed toward the inner end of the flat plate 20 (toward the floating body 1A). In the motion suppression member 10B of the second embodiment, as shown in Fig. 8, the lower end of the strut 30 protrudes toward the underside 22 of the flat plate 20 through a recess 25 in the flat plate 20. Also, as shown in Fig. 9, beam members 31, 31 are formed to protrude laterally from both sides of the lower end of the strut 30. 8, the lower surface 22 of the flat plate 20 is placed on the upper surface of the beam member 31 of the strut 30. In this manner, the flat plate 20 is supported by the beam member 31 of the strut 30. In addition, when the connection between the strut 30 and the flat plate 20 is released, a stopper (not shown) is provided on the upper hinge 60 so that the strut 30 does not tilt downward more than when the strut 30 and the flat plate 20 are connected (so that the state of the strut 30 shown in Figure 8 is maintained). A plurality of bolts 32 (see FIG. 9) protrude from the upper surface of the beam member 31. The bolts 32 are inserted into connecting holes 26 formed in the flat plate 20, and nuts 33 are screwed onto the upper surface 21 of the flat plate 20. In this manner, the beam member 31 and the flat plate 20 are fixed together.

[0023] Next, a method for installing the motion suppressing member 10B of the second embodiment on the side surface of the floating body 1A on water will be described. FIG. 10 is a side view of a motion suppressing member according to a second embodiment of the present invention, in which a flat plate and a strut are superimposed on the side surface of a floating body. When constructing the floating body 1A on land, as shown in Figure 10, the connection between the lower end of the strut 30 and the flat plate 20 is released, and the strut 30 and the flat plate 20 are rotated upward, and the strut 30 and the flat plate 20 are stacked and fixed on the side surface 2 of the floating body 1A. With the manufactured floating body 1A floating on the water at an installation location on the water, the strut 30 is rotated downward as shown in Figure 8. At this time, the strut 30 is maintained in the state it was in when connected to the flat plate 20 by a stopper (not shown) of the upper hinge 60. Next, the flat plate 20 is rotated downward to spread the flat plate 20 to the side of the floating body 1 A. At this time, the flat plate 20 is rotated downward while the struts 30 are inserted into the recesses 25 of the flat plate 20. Then, the flat plate 20 is placed on the upper surfaces of both beam members 31, 31 (see FIG. 9) of the strut 30. The bolts 32 of the beam members 31 are inserted into the connecting holes 26 of the flat plate 20, and nuts 33 are screwed onto the bolts 32, thereby fixing the beam members 31 and the flat plate 20 together. At this time, since the flat plate 20 is supported by the beam members 31 of the struts 30, the struts 30 and the flat plate 20 can be connected in a state in which the flat plate 20 is stabilized.

[0024] The second embodiment of the present invention has been described above, but the present invention is not limited to the second embodiment, and similar to the first embodiment, it can be modified as appropriate within the scope of the spirit thereof. For example, in the second embodiment of the motion suppression member 10B, as shown in Figure 9, two beam members 31, 31 are provided on the strut 30, but the number and length of the beam members 31 are not limited and are set appropriately depending on the size and weight of the flat plate 20. Furthermore, in the motion suppression member 10B of the second embodiment, the beam member 31 and the flat plate 20 are connected by a bolt joint, but the method of connecting the beam member 31 and the flat plate 20 is not limited thereto. [Explanation of symbols]

[0025] 1A Floating body 1B Floating body (other embodiments) 2 sides 10A Shake suppression member ( Reference example, First embodiment) 10B Shake suppression member (Second embodiment) 20 Flat plate 21 Upper surface 22 Lower surface 25 Depression 26 Connecting hole 30 Strut 31 Beam member 32 Bolt 33 Nut 40 Connecting member 50 Lower hinge 51 Pin 60 Upper hinge 61 Pin 70 Connecting fitting 71 First bracket 72 Second bracket 73 Pin

Claims

1. A motion suppression member provided on the side surface of a floating body moored in a floating state on water, comprising: a flat plate projecting laterally from the side surface of the floating body; a strut having an upper end connected to the side surface of the floating body and a lower end connected to the flat plate; a plurality of the flat plates and a plurality of the struts are arranged side by side in the lateral direction; each of the struts is connected to each of the flat plates; adjacent flat plates are connected by a connecting member; an inner end of the flat plate and an upper end of the strut are each connected to the side surface of the floating body by a hinge; in a state where the connection between the lower end of the strut and the flat plate is released; the strut and the flat plate are rotatable in the vertical direction with respect to the side surface of the floating body. A motion suppression member characterized by this.

2. A motion suppression member provided on the side surface of a floating body moored in a floating state on water, comprising: a flat plate projecting laterally from the side surface of the floating body; a strut having an upper end connected to the side surface of the floating body and a lower end connected to the flat plate; a beam member projecting laterally from the lower end of the strut supports the lower surface of the flat plate; [[ID= ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ A method for installing a shake suppression member, characterized by comprising a step of connecting a lower end portion of the strut to the flat plate.

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