Method for mooring floating structure and wave power generation device

Abstract

To provide a mooring method that allows a float to be easily installed regardless of whether it is in shallow waters or offshore, and requires a narrow sea area, and to provide an offshore wave power generation device that utilizes the mooring method, has good power generation efficiency, does not become flooded even when hit by a tsunami or high waves, and takes into consideration the impact on the ecosystem. [Solution] A cable connecting the sinker on the seabed to the float, and a sinker and cable for pulling the cable taut are installed on the float. These cables are wound onto respective drums, and the two drums are connected by a mechanism so that the sinker on the seabed and the sinker on the float attract each other. Furthermore, a differential gear, ratchet mechanism, and torque limiter are incorporated into the mechanism connecting the drums, resulting in a mechanism that will not become flooded even if the sea level rises and falls more than expected. A wave power generation device is also installed, which generates power from the drum connected to the cable rotating when the float rises due to buoyancy by pulling on the sinker on the seabed.

Description

[Technical field]

[0001] The present invention relates to a mooring method for a floating structure and a wave power generation device, and in particular to an offshore wave power generation device that generates power from the vertical movement of waves and horizontal oscillations caused by ocean currents. [Background technology]

[0002] Various mooring methods are known as conventional methods for mooring floating structures, including the mooring method for offshore wind power generation, as disclosed in Patent Document 1. However, this mooring method involves mooring the structure by pulling on cables with weights attached to them that are separated in at least three directions, and therefore requires a large area of ​​sea including the weights and cables, which can have a significant impact on fishing and other vessels.

[0003] There is a mooring method for offshore wind power generation in which a floating body is moored with a tensioned cable, as in Patent Document 2, which solves this problem, but this method has the problem of being difficult to install, resulting in high installation costs.

[0004] A method similar to the mooring method for floating structures of the present invention is disclosed in Patent Document 3, but the counterweight in this document is subject to ocean currents because the sinker is underwater, and is therefore more likely to be swept away by ocean currents, requiring a wider area of ​​sea. Also, a heavier sinker must be prepared in consideration of buoyancy underwater than in the air. Also, in structures with two or more parallel cables in the sea, the cables are more likely to become tangled. Also, the sinker moves up and down underwater, which can have an impact on the ecosystem of marine life.

[0005] In addition, a conventional wave power generation device is disclosed in Patent Document 4, but this wave power generation device can only be installed in a location adjacent to land, and there are problems with the costs of foundation construction and land costs. In addition, to install it offshore, a foundation must be built offshore, which further increases the installation costs, and once installed, it cannot be moved or relocated.

[0006] An offshore wave power generation device, as disclosed in Patent Document 5, is already available. This wave power generation device uses a pile fixed to the seabed and a floating body restrained by the pile, which moves up and down, and the rack mechanism and pinion gear on the pile and floating body turn the generator. With this installation method, even though it is an offshore type, it can only be installed in shallow waters, and there is a problem in that long piles must be manufactured to install it in deep offshore waters.

[0007] In addition, as in Patent Document 6, there is a floating structure connected to the seabed by a cable, but when the water level drops due to tides and the cable bends, it is easily swept away, and the required sea area becomes wider. Also, it cannot cope with unexpected rises and falls of the sea level due to tsunamis and high waves, and is flooded.

[0008] Furthermore, when a device such as that disclosed in Patent Document 7 is installed in the sea, the device must be waterproofed and treated to withstand water pressure, which increases the manufacturing costs of the device and makes maintenance difficult.

[0009] Furthermore, all of the wave power generation devices described above are only capable of generating electricity from the vertical movement of waves, and cannot generate electricity from horizontal vibrations caused by ocean currents, etc.

[0010] In addition, Patent Document 8 discloses an offshore wave power generation device using a cable similar to the wave power generation device of the present invention. Since this wave power generation device has a structure in which the sinker is underwater, the sinker receives resistance from the water when it moves up and down, which reduces the reaction and leads to a decrease in power generation efficiency. As in Patent Document 3, since the sinker is underwater, it is also subjected to the flow of water, so it is easily swept away by ocean currents and the required sea area becomes wider. In addition, since there are two parallel cables in the sea, there is a problem that the cables are easily tangled. In addition, a structure in which one cable connects the sinker on the seabed and the float and the sinker at the end of the float without a pulley or mechanism, the up and down of a 2m wave results in the up and down movement of the sinker of 2m, so the operating range of the sinker becomes large. Therefore, it has a large impact on the ecosystem, such as marine organisms. In addition, since the sinker is underwater, protecting it with something like a tube will cause the water flow to have no place to escape, which will increase the water resistance and slow down the movement of the sinker. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] JP 2018-039474 A [Patent Document 2] JP 2023-124020 A [Patent Document 3] JP 2008-265492 A [Patent Document 4] Japanese Patent Application Publication No. 07-259063 [Patent Document 5] JP 2016-113985 A [Patent Document 6] JP 2014-156791 A [Patent Document 7] JP 2016-033346 A [Patent Document 8] Japanese Patent Application Publication No. 11-006472 Summary of the Invention [Problem to be solved by the invention]

[0012] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a mooring method for a floating structure that can be easily installed in shallow waters or offshore, is not easily swept away by ocean currents, and requires a narrow sea area.

[0013] To provide a mooring method for a floating structure which is not affected by vertical changes in sea surface occurring over a long period of time such as tides, does not submerge the floating body even when hit by a tsunami or high waves, and has little effect on the underwater ecosystem.

[0014] The object of the present invention is to provide a wave power generation device which has low installation costs and difficulty regardless of whether the location is shallow or offshore due to the buoyancy of the float that floats using these mooring methods, is not affected by up and down sea level changes due to tides, is not flooded by tsunamis or high waves, does not require waterproofing or pressure resistance treatment, has little impact on the underwater ecosystem, is easy to maintain, and has good power generation efficiency. [Means for solving the problem]

[0015] In order to achieve the above-mentioned objective, the mooring method for a floating structure of the present invention is characterized in that a cable connects the float to a sinker on the seabed, and another sinker is installed on the float for the purpose of pulling the cable, and the float is moored by the sinker on the seabed and the sinker installed on the float pulling on each other.

[0016] This forces the float to return directly above the sinker on the seabed, making it less likely to drift away, allowing the required sea area to be designed to be narrower.

[0017] The sinker on the float is suspended high up by a cable and pulley and installed on the float. The cables connecting the sinker on the seabed and the sinker on the float are wound on drums and installed on the float, and the two drums are linked by a mechanism so that the sinker on the seabed and the sinker on the float pull against each other, mooring the float.

[0018] This allows for easy installation in shallow waters or offshore, depending on how the cable drum connected to the sinker on the seabed is wound, and allows for easy movement and relocation to different locations. The cable of the sinker on the float and the cable of the sinker on the seabed do not become entangled. Furthermore, since the sinker that moves up and down is on a float, the impact on the underwater ecosystem can be reduced. In addition, the generator, which will be described later, can be easily installed offshore where the water level is deep, expanding the area where it can be installed, and it is less likely to spoil the scenery from land than if it were installed in shallow waters.

[0019] In addition, the mechanism connecting the drums uses a differential gear and a ratchet mechanism, or other mechanism that restricts the rotation of the gears in one direction (hereinafter referred to as the ratchet mechanism), to rotate the drum of the cable connected to the weight on the float more when the waves are rising than when they are falling, thereby winding up more of the cable connected to the weight on the float with each up and down movement, and when the winding of the cable exceeds the operating range, the length of the cable is corrected by connecting it to the differential gear and running a torque limiter freely.

[0020] This means that the device will not become flooded even if it is hit by a tsunami or high waves, and the equipment installed on the floating body does not need to be waterproofed or pressure-resistant due to flooding. Also, when the sea level rises due to the tide, the torque limiter rotates freely, pulling out the cable connected to the sinker on the seabed from the drum, and when the sea level drops due to the tide, the differential gear and ratchet mechanism reel the cable connected to the sinker on the seabed back onto the drum, and the length of the cable is automatically adjusted according to the water level.

[0021] In addition, by using two cables, each wound around a drum and connecting the drums with a mechanism, the ratio of the range of motion can be changed by changing the gear ratio and the drum size ratio, for example, to change the vertical movement of the weight on the float by 1m for a 2m rise in sea level. This allows the operating range of the weight on the float to be designed to be shorter than the assumed vertical movement of the sea level. Therefore, the tubes and rails used to restrain the weight can also be designed to be shorter.

[0022] In addition, since the device is on a floating structure on the sea, there is no need to waterproof or pressure-resistant the mechanism, making it easier to incorporate complex mechanisms. It also reduces the impact of barnacles and other ecosystems on the device.

[0023] The wave power generating device of the present invention is also characterized in that the pulling force caused by the buoyancy of the sinker on the seabed and the float due to the mooring method of the present invention is used to generate power by using the cable as power.

[0024] In order to increase the power generation capacity of this wave power generation device, the buoyancy of the float and the weight of the sinker on the seabed can be simply increased. In addition, because the weight on the floating structure is in the air, rather than in the water, resistance is low, and it does not impede power generation as much as if it were in the water. Also, because the weight is in the air, it is easy to cover it with a tube, and safety and the impact on the ecosystem are also taken into consideration. Effect of the Invention

[0025] Due to the above-mentioned features, it is possible to provide a mooring method that can be installed easily and at low cost on a floating structure, regardless of whether it is in shallow waters or offshore, and which requires a narrow sea area because it is less likely to be swept away by ocean currents.

[0026] Furthermore, the drums and mechanism make it possible to provide a mooring method that is not affected by long-term up and down changes in sea level due to tides, and that prevents the float from becoming submerged even when hit by a tsunami or high waves.

[0027] Furthermore, due to the buoyancy of the floating body caused by this mooring method, it is possible to provide a wave power generation device that has low installation costs and difficulty regardless of whether the water is shallow or offshore, is not affected by vertical changes in sea level due to tides, is not flooded by tsunamis or high waves, does not require waterproofing or pressure resistance treatment, has little impact on the underwater ecosystem, is easy to maintain, and has good power generation efficiency. [Brief description of the drawings]

[0028] [Figure 1] FIG. 1 is an overall schematic diagram of the present invention. [Diagram 2]1 is a schematic diagram of a mooring method for a floating structure and a mechanism inside a machine room of a wave power generation device according to the present invention. FIG. [Diagram 3] FIG. 3 is a schematic diagram of a mechanism relating to the differential gear of FIG. 2. [Figure 4] FIG. 2 is a side view of a floating body and a cross section of a tube on the floating body. [Diagram 5] This is a side view of what would happen if sea levels dropped more than expected. [Figure 6] FIG. 11 is a schematic diagram of Example 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] In this embodiment of the mooring method for a floating structure, the float (2) is connected to a sinker on the seabed or a foundation (1) fixed to the seabed by piles or the like (hereinafter referred to as the sinker on the seabed) by a cable (4), and this cable (4) is wound up by a drum (10) on the float. It is preferable that this drum (10) has a cable groove to prevent turbulence and wear of the cable. There is a sinker (3) on the float to wind up the drum of this cable.

[0030] A cable (5) is attached to the sinker (3) on the float, and a pulley (22) on the float pulls the cable from a high point in the air by gravity. This cable (5) is wound around a drum (11) and connected to the drum (10) of the cable from the seabed by a mechanism, so that the sinker (1) on the seabed and the sinker (3) on the float pull on each other. For example, something like a seesaw could be used as a substitute for this as a device to pull up one sinker by the gravity of the other, but a cable and pulley are safer and easier to protect with a tube, and a drum is considered to be more compatible with the mechanism. Details of the mechanism will be described later.

[0031] The weights pull on each other, and the weight (3) on the float is pulled straight down by gravity, which is then reversed to a force pulling straight up by the pulley (22), which acts to keep the float (2) directly above the weight (1) on the seabed. This makes it possible to moor the float (2) without it drifting away.

[0032] A tube or rail (7) is installed on the float (2) to restrain the weight (3) from moving up and down, and the weight (3) moves up and down according to this restraint. It is preferable to have casters (24) to prevent friction between the tube (7) and the weight (3). The weight (3) is fixed within its range of motion at the top and bottom of the tube (7), and it is preferable to use springs or repulsive magnets (23) to absorb the impact of the weight (3) hitting the top and bottom of this tube.

[0033] The sinker (1) on the seabed must be heavy enough to anchor the floating structure, and the cable (4) and drum (10) to the sinker on the seabed must be strong, such as those used in large hoists. However, the weight of the sinker (3) on the floating body is enough to keep the cable (4) taut to the sinker on the seabed. Therefore, the cable (5) used for the sinker on the floating body and the drum (11) used for winding it up do not need to be so strong in comparison.

[0034] It is preferable to have a light weight (6) attached to the cable on the seabed. This allows for a sag between the weight (1) on the seabed and the weight (6) in the middle when the sea level drops more than expected and the cable (4) sags. This prevents the cable (4, 5) from sagging near the drums (10, 11) and prevents the cable (4, 5) from coming off the drums (10, 11) or becoming tangled. In addition, the weight (3) on the float needs to keep the cable (4) including the weight (6) taut, so the weight (3) on the float must be heavier than the weight (6). (Figures 5 and 4)

[0035] The mooring method for the floating structure of this embodiment can respond to large up and down movements of the sea surface such as high waves and tsunamis by using a mechanism, and can also be installed in sea areas where the sea surface changes significantly due to tides. The details of the mechanism are explained below.

[0036] This mechanism is equipped with one differential gear (12) (planetary gears are also acceptable since planetary gear mechanisms can also combine rotations), which is the same as the differential gear used, for example, on the rear wheels of a car to distribute rotation from the propeller shaft to the left and right tires. In the case of a car, the gears connected to the left and right tires are respectively connected to a large gear (19) and a small gear (18) installed on a cable drum (10) that is connected to a sinker on the seabed. The large gear (19) on the drum is directly connected to the differential gear (12B), and the small gear (18) is connected to a ratchet mechanism (15B) and then connected to the differential gear (12C) using a large gear. The large gear (12C) of this differential gear is also restricted in its rotation in one direction by the ratchet mechanism (15A). In addition, a torque limiter (14) is connected to this gear (12C) so that the torque limiter (14) rotates freely when a load is applied. The gear (12A) connected to the propeller shaft of the differential gear car is connected to a cable drum (11) that is connected to a weight on the floating body.

[0037] As a result, when the float (2) floats, both gears (18, 19) connected to the cable drum (10) connected to the seabed of the differential gear rotate, and the combined rotation of both gears winds up the cable (11) connected to the sinker on the float. Conversely, when the float (2) sinks, the rotation is transmitted to only one side (12B) by the ratchet mechanism (15A) connected to the differential gear (12C), pulling the cable (4) connected to the sinker on the seabed and removing the slack. At this time, the small gear rotates freely due to the ratchet mechanism (15B). As a result, the sinker (3) on the float is wound up little by little with each up and down movement.

[0038] If the weight (3) on the float is wound beyond the operating range, it is stopped by the upper part of the tube (7), and at the same time, the cable drum (11) connected to the weight of the float of the differential gear is locked and cannot move. At this time, a load is applied to the torque limiter (14) of the differential gear, which rotates the large gear (19) of the drum and rotates freely in the opposite direction through the differential gear (12), allowing for a smooth response. Since this torque limiter (14) operates frequently, it is preferable to use a type that uses magnetism or fluid rather than friction, which is less prone to wear and deterioration. The load that the torque limiter (14) can handle is heavier than the weight (3) on the float, so that it does not differential unless the weight locks. Also, if it is too heavy, it will reduce the buoyancy of the float when rotating the generator (13) described later, which will hinder power generation, so it needs to be moderate.

[0039] Due to the idling of this torque limiter (14), even if the sea level rises more than expected due to high waves or tsunamis, the float (2) will not be submerged, and the cable (4) connected to the sinker on the seabed will be pulled out from the drum (10) as much as necessary. Therefore, the cable (4) connected to the seabed is usually wound on the drum (10) with a spare length. On the other hand, even if the water level drops more than expected and the cable on the seabed sags (Figures 5 and 4), it will not remain sagging because it will be wound up little by little by the differential gear (12) and ratchet mechanism (15A, 15B).

[0040] The wave power generation device of this embodiment is installed on a float (2) that floats using the mooring method for the floating structure described above, and is connected by a mechanism such as gears to a drum (10) for winding up a cable connecting the float to the sinker on the seabed. When the drum (10) rotates due to the buoyancy of the float (2) as it rises, the resulting power turns a generator (13) and generates electricity.

[0041] At this time, it is preferable to rotate the drum using a ratchet mechanism (15C) or a free wheel in order to throttle the rotation in the direction obtained from the buoyancy, and to obtain efficient rotational force from the rotation in the direction of the buoyancy. Also, since the rotation speed of the drum (10) depends on the speed of the wave amplitude, it is preferable to convert it to a speed suitable for power generation using a gearbox or the like.

[0042] Taking advantage of the feature of assembling the mechanism on a float in this embodiment, it is preferable to incorporate a device that can temporarily disconnect the mechanism using a clutch (25) in various places. Specifically, in the place where the cable drum (11) connected to the sinker on the float connects to the differential gear (12A), and in the place where the cable drum (10) connected to the sinker on the seabed connects to the generator (13), etc. This makes maintenance easier, and when installing, the sinker (1) can be lowered to the seabed with the clutch disengaged, and when the sinker sinks to the seabed, the clutch can be engaged to start operation.

[0043] The generator (13) or each mechanism is preferably placed in a machine room or case that is waterproof enough to withstand the elements, even if it is not as strong as waterproof or pressure-resistant. The diagrams used here only show the mechanisms for the sake of clarity and explanation.

[0044] This wave power generation device is designed so that people can stand on it to perform maintenance, so it is preferable to have a fence (8) around the float to prevent people from falling. It is also designed to be large enough for people to stand on, but it is also preferable that the float is not too large, because if it is too wide horizontally, the waves will be averaged out and the vertical movement will be reduced. Therefore, to increase the buoyancy of the float, it is necessary to increase its volume vertically (20), but in that case, it is preferable to design it heavy by installing a weight (21) at the bottom of the float to prevent it from capsizing.

[0045] The feature of the present invention that the length of the cable is automatically adjusted allows the weight on the bottom of the sea to be lighter than the buoyancy of the float. In a system that does not have the feature of automatically adjusting the length of the cable, the weight on the bottom of the sea must be made heavier than the buoyancy of the float so that the weight on the bottom of the sea does not float and drift even in the event of unexpected high waves. This causes the float to be submerged in unexpected high waves. In addition, the present invention can be installed on ships that normally move, and can be used instead of anchors when anchoring at sea, allowing the ship to moor while generating electricity. (Example 5)

[0046] Since this wave power generation device has a single sinker (1) on the seabed and cable (4), the float rotates in the yaw direction due to wind and ocean currents. Therefore, in order to suppress this rotation, it is preferable to install a fin (9) on the float (2) to suppress the rotation. It is also preferable to install this cable on the floating body while reducing friction with a sheave (16) or the like so that the cable does not rub directly against the floating body. EXAMPLES

[0047] A wave power generation device combining the above-mentioned forms is installed offshore, and the generated electricity is transmitted via a power transmission line or stored in a storage device such as a battery and periodically collected. EXAMPLES

[0048] Since the required sea area for the wave power generation device is small, several of them are installed horizontally. EXAMPLES

[0049] One or more may be installed on the same float or on connected floats. EXAMPLES

[0050] The wave power generation device or mooring method described above is used as a mooring method for offshore wind power generation (Figure 6). EXAMPLES

[0051] It is used as a mooring method for small boats and generates electricity for the boats through wave power generation. It is difficult to generate electricity for large ships because the waves are averaged and stabilized, making them less likely to rock up and down. [Industrial Applicability]

[0052] The method for mooring a floating structure according to the present invention requires a smaller area of ​​sea than the existing methods for mooring floating structures, and is therefore less likely to interfere with other industries such as fishing. An apparatus for carrying out the method for mooring a floating structure according to the present invention is manufactured and provided. The wave power generation device of the present invention is manufactured and provided. The present invention provides electricity generated by a wave power generation device. In particular, it can provide more electricity when installed in combination with offshore wind power generation. [Explanation of symbols]

[0053] 1. Undersea sinker 2. Floating Body 3. Weights on floating bodies 4. Cable to the bottom sinker 5 Cable to weight on floating body 6. An intermediate weight for adjusting the slack position of the undersea cable 7. A tube for restricting the vertical movement of a weight on a floating body 8 Fences and handrails 9 Fin 10 Drum for cable to sinker on the seabed 11 Drum for cables to sinkers on floating bodies 12 Differential gear 12A In a car, it is a gear that also serves as a spider gear connected to the propeller shaft. 12B In a car, the gear connected to the right wheel 12C Differential gear: Large gear, like the gear connected to the left wheel in a car 13. Generator 14 Torque limiter 15 Ratchet mechanism, or mechanism for restricting gear movement to one-way rotation 15A Ratchet mechanism that restricts 12C to rotation in one direction 15B Ratchet mechanism that restricts 18 to rotation in one direction 15C Ratchet mechanism that restricts rotation to the generator 16 Sheave (a pulley installed for the purpose of correcting the cable route) 17 Gear connecting 12A and 11 18 Smaller gear connecting 12C and 10 19 Gear connecting 12B and 10 20 Cavity for buoyancy 21 A weight to lower the center of gravity of a floating body 22 Fixed pulley for suspending weights on floating bodies 23 Spring 24 Caster 25 Clutch 26 Wind Turbine Generator 100 sea level 101 Undersea 102 Undersea Continue to 103 Floating Body Weight 104 Continue to the Undersea Sinker

Claims

1. The method for mooring a floating structure comprises a cable (4) connecting a float (2) to a weight on the seabed or a foundation (1) fixed to the seabed, and a weight (3) installed on the float for the purpose of pulling the cable (4) to the float, and a device that converts the weight of one into a lifting force for the other causes the weight of the seabed (1) and the weight installed on the float (3) to pull each other by gravity, thereby keeping the float (2) in a fixed position.

2. A pulley (22) is used as a device for converting the weight of one side into a lifting force of the other side in the mooring method for a floating structure described in claim 1, a weight (3) installed on the float is hung from a high position on the float by the pulley (22), and the weight (3) hung from the pulley (22) is restrained to a vertical movement by a tube (7), thereby pulling the weight (1) on the seabed and the weight (3) on the float together with a cable. A mooring method for a floating structure characterized by installing this pulley (22) and the tube (7) that restrains the weight on the floating structure described in claim 1.

3. A method for mooring a floating structure according to claim 2, in which a cable (4) to a sinker on the seabed is attached to a tool for winding the cable such as a drum (10) and installed on the float (2), and a sinker (3) on the float is installed on the float by another cable (5) and another drum (11), and these two drums (10, 11) are linked by a gear-based power transmission mechanism to pull together the sinker (1) on the seabed and the sinker (3) on the float. A method for mooring a floating structure according to claim 2, characterized in that the two drums (10, 11) and the power transmission mechanism connecting the two drums are installed on the floating structure according to claim 2.

4. The mooring method for a floating structure according to claim 3 is characterized in that a differential gear (12) and a ratchet mechanism (15) are installed in the mechanism for interlocking the two drums (10, 11), and the differential gear (12) and the ratchet mechanism (15) rotate the gear (17) connected to the sinker on the float more when the float rises due to waves than when it descends, so that the cable (5) connected to the sinker on the float is wound onto the drum (11) every time the float moves up and down. The mooring method for a floating structure according to claim 3 is characterized in that the differential gear (12) and the ratchet mechanism (15) are installed in the floating structure according to claim 3.

5. The method for mooring a floating structure according to claim 4 is characterized in that a torque limiter (14) is installed on the differential gear (12), and the torque limiter (14) has the purpose of automatically adjusting the length of the cable (4) to the sinker on the seabed by applying a load to the torque limiter (14) exceeding the allowable load when the sinker (3) on the float locks at the limit of its operating range. The method for mooring a floating structure according to claim 4 is characterized in that the torque limiter (14) is installed on the floating structure according to claim 4.

6. The mooring method for a floating structure according to claim 5, characterized in that while retaining the installation of the differential gear (12), torque limiter (14) and two drums of the mooring method for a floating structure according to claim 5, the tube (7) of claim 2 is eliminated, and the specification of placing the sinker (3) on the float in claim 1 is eliminated, and the sinker (3) is placed underwater.

7. A seesaw is used as a device for converting the weight of one side into lifting force for the other side in the mooring method for floating structures described in claim 1, a weight (3) is installed on one side of the seesaw, and a cable (4) is connected to a weight on the seabed on the other side of the seesaw, thereby pulling together the weight (1) on the seabed and the weight (3) on the floating structure. A mooring method for floating structures characterized by installing this seesaw on the floating structure described in claim 1.

8. The method for mooring a floating structure according to claim 7 comprises attaching a cable (4) to a sinker on the seabed to a tool for winding the cable, such as a drum (10), and installing the cable on the float (2), and linking the drum (10) and the seesaw according to claim 7 with a gear-based power transmission mechanism to pull together the sinker (1) on the seabed and the sinker (3) on the float. The method for mooring a floating structure according to claim 7 comprises installing the power transmission mechanism connecting the drum (10) and the seesaw to the floating structure according to claim 7.

9. The mooring method for a floating structure according to claim 8 is characterized in that a differential gear (12) and a ratchet mechanism (15) are installed on the drum (10) of the mooring method for a floating structure according to claim 7 and the mechanism for interlocking the seesaw according to claim 7, and the differential gear (12) and the ratchet mechanism (15) aim to raise the seesaw more when the float rises due to waves than when it descends, so that the weight of the seesaw is gradually raised higher with each up and down movement of the float. The mooring method for a floating structure, characterized in that the differential gear (12) and the ratchet mechanism (15) are installed on the floating structure according to claim 8.

10. The mooring method for a floating structure according to claim 9 is characterized by installing a torque limiter (14) on the differential gear (12), and the purpose of this torque limiter (14) is that when the seesaw according to claim 7 is locked at the limit of its operating range, a load is applied to the torque limiter (14) and the torque limiter (14) spins freely due to the load exceeding the allowable load, thereby automatically adjusting the length of the cable (4) to the sinker on the seabed. The mooring method for a floating structure according to claim 9 is characterized by installing this torque limiter (14) on the floating structure according to claim 9.

11. A wave power generation device, characterized in that a float floated by the mooring method of any one of claims 1 to 10 generates power from the force of pulling a cable (4) connected to a sinker on the seabed due to buoyancy caused by up and down movement due to waves or horizontal swaying due to ocean currents.

Images