Cavity type floating mooring point structure

Abstract

The invention relates to a cavity type floating mooring point structure. Compared with the prior art, the closed cavity is formed, and the amount of ballast water in the closed cavity is controlled through the pump; when ballast water is pumped into the buoyancy core, the buoyancy of the buoyancy core is reduced, the position of the buoyancy core sinks, the tension degree of the tension leg is loosened, and the tension leg can work in a more elastic interval, so that the buoyancy core and the floating body connected with the buoyancy core can obtain a larger movement range, fatigue damage to the mooring system caused by impact of extreme sea conditions is effectively reduced, and the service life of the mooring system is prolonged. And when ballast water is discharged by the buoyancy core, the buoyancy of the buoyancy core is increased, the position of the buoyancy core floats upwards, the tensioning degree of the tension leg is increased, the motion amplitude of the buoyancy core and the floating body is reduced, the system is more stable, service work is facilitated, the operation and maintenance difficulty is reduced, and the flexibility of the mooring point structure is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of floating mooring, in particular to a cavity type floating mooring point structure. BACKGROUND

[0002] Floating structure is one of the most important carrier forms in the process of offshore resource development, which relies on the mooring force provided by the mooring system to resist environmental loads such as wind, wave and current, so that the upper structure can not be displaced and shaken greatly in the harsh marine environment.

[0003] In the related art, there is a tension leg mooring system, which directly connects the floating body and the anchor point by using the tension cable, and the anchor point is fixed to the seabed surface. When the extreme sea conditions impact, the bearing capacity of the anchor point is high and changes rapidly, which is easy to cause fatigue damage to the anchor point and the tension cable, thereby shortening the service life of the anchor point and the tension cable. Moreover, the tension anchor chain is always in the same tension state and cannot be adjusted in tension, so the flexibility is low. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a cavity type floating mooring point structure.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] According to the cavity type floating mooring point structure provided by the present application, one end of the tension leg is connected to the anchor foundation, and the other end of the tension leg is connected to the floating core. The floating core is used to connect the floating body, and the anchor foundation is used to connect the seabed surface. The floating core includes an upper plate, a lower plate, and a side plate located between the upper plate and the lower plate. The side plate is arranged around the edge of the upper plate to form a closed cavity with the side plate, the upper plate and the lower plate. A pump is arranged in the closed cavity, and the pump is used to control the water quantity in the closed cavity to adjust the ballast of the floating core, control the size of the buoyancy of the floating core and the tension degree of the tension leg, and adjust the constraint degree on the floating body.

[0007] Compared with the prior art, the side plate of the present invention is located between the upper plate and the lower plate, and is arranged around the edge of the upper plate so that the side plate, the upper plate and the lower plate form a closed cavity. The water volume in the closed cavity is controlled by a pump to adjust the ballast of the buoyancy core, control the buoyancy of the buoyancy core and the tension of the tension legs, thereby adjusting the degree of constraint on the float. When ballast water is injected into the buoyancy core, the buoyancy of the buoyancy core decreases, the position sinks, the tension of the tension legs loosens, the degree of constraint of the buoyancy core on the float decreases, and the float connected to it can obtain a larger range of motion. This effectively reduces the fatigue damage to the mooring system under the impact of extreme sea states, increases the service life and safety of the mooring system. When the buoyancy core discharges ballast water, the buoyancy of the buoyancy core increases, the position rises, the tension of the tension legs tightens, the degree of constraint of the buoyancy core on the float increases, the range of motion of the float decreases, and it becomes more stable, which is beneficial to service operation, reduces maintenance difficulty, and improves the flexibility of the mooring point structure. It is worth noting that the tension legs remain taut regardless of the ballast condition. The difference lies in the degree of tension. For example, in the working condition, i.e., when there is no ballast or the ballast is small, the tension legs are taut, allowing the float nodes to withstand the corresponding mooring load with minimal displacement. Conversely, in the typhoon avoidance condition, i.e., when there is ballast or the ballast is large, the tension legs are taut, with sufficient deformation reserve. Under the action of mooring load, they can undergo greater deformation, thus allowing the float nodes to move within a wider range. This avoids fatigue damage caused by the mooring system being under high stress for a long time, and is more conducive to system safety and long-term service.

[0008] Preferably, a stiffening plate is provided inside the enclosed cavity, the stiffening plate is connected between the upper plate and the lower plate, and the plane of the stiffening plate passes through the center of the enclosed cavity.

[0009] Preferably, a central body is provided at the central axis of the enclosed cavity, the central body connects the upper plate and the lower plate, and multiple stiffening plates are evenly arranged around the central body. The stiffening plates also connect the central body and the side plates, so that an enclosed chamber is formed between adjacent stiffening plates.

[0010] Preferably, the interior of the central body is formed as a cavity structure, and the cavity structure serves as an expansion dock for one or more of the following: a distributed booster chamber, aquaculture feed chamber, peak-shaving battery storage chamber, monitoring base station, and drone hangar. The pump is connected to the power supply equipment inside the cavity structure.

[0011] Preferably, the buoyancy core is connected to the float via a mooring line, and a dynamic cable is provided on the mooring line to connect the float to the equipment inside the cavity structure via the dynamic cable.

[0012] Preferably, the mooring line includes anchor cables and / or anchor chains.

[0013] Preferably, the pumps are configured as multiple pumps, each located within a closed chamber; or, the stiffening plate is provided with through holes, and a control device is installed between the closed chambers to control the opening and closing of the through holes, so as to seal the through holes corresponding to damaged closed chambers.

[0014] Preferably, the anchoring foundation includes one or more of gravity anchors, pile anchors, and suction anchors.

[0015] Preferably, the tension leg includes a tension cable, and the tension leg is kept taut so that when the float and buoyancy core are deviated from their positions under load, the tension cable stretches to its limit length under the current load level to provide mooring force, limit the displacement of the buoyancy core, and provide restoring force to the buoyancy core and float by generating additional tension through stretching.

[0016] Preferably, the buoyancy core is attached to the outer frame, and the outer frame is connected by rods to form a cage shape. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the shared mooring system of the present invention applied to a floating wind farm;

[0018] Figure 2 This is a schematic diagram of the cavity-type mooring point of the present invention;

[0019] Figure 3 This is a schematic diagram of the load-bearing and recovery mechanism of the shared mooring system of the present invention;

[0020] Figure 4 This is a schematic diagram of the variable stiffness mechanism of the float node in this invention.

[0021] Figure label:

[0022] 1. Float; 2. Float node; 21. External frame; 22. Buoyancy core; 23. Anchorage point; 24. Balance buoy; 25. Fixing point; 26. Enclosed cavity; 27. Stiffening plate; 28. Pump; 3. Mooring line; 4. Tension leg; 5. Anchorage foundation; 6. Dynamic cable; 7. Cavity structure. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0024] This invention provides a cavity-type floating mooring point structure, such as... Figure 1 and Figure 2As shown, it includes an anchoring foundation 5, a buoyancy core 22, and a tension leg 4. One end of the tension leg 4 is connected to the anchoring foundation 5, and the other end of the tension leg 4 is connected to the buoyancy core 22. The buoyancy core 22 is used to connect the floating body 1, and the anchoring foundation 5 is used to connect the seabed surface. The buoyancy core 22 includes an upper plate, a lower plate, and a side plate located between the upper plate and the lower plate. The side plate is arranged around the edge of the upper plate so that the side plate, the upper plate, and the lower plate form a closed cavity 26. A pump 28 is installed in the closed cavity 26, and the pump 28 is used to control the water volume in the closed cavity 26 to adjust the ballast of the buoyancy core 22, control the buoyancy of the buoyancy core 22 and the tension of the tension leg 4, and adjust the degree of constraint on the floating body 1.

[0025] like Figure 2 and Figure 4 As shown, the cavity-type buoyancy core 22 is welded into a hollow cavity using a sealed, watertight material. A pump 28 can be additionally installed on the cavity to control the intake / discharge of water into the tank. By adjusting the ballast of the buoyancy core 22, the stability and buoyancy of the entire buoyancy core 22 can be controlled, thereby adjusting the tension of the tension legs 4. For example, when ballast water is injected into the buoyancy core 22, the buoyancy of the buoyancy core 22 decreases, its position sinks, and the tension of the tension legs 4 becomes looser. The tension legs can operate within a more flexible range, allowing the buoyancy core 22 and the connected float 1 to obtain a greater range of motion. This effectively reduces fatigue damage to the mooring system under the impact of extreme sea states, increasing the service life and safety of the mooring system. When the buoyancy core 22 discharges ballast water, the buoyancy of the buoyancy core 22 increases, its position rises, the tension of the tension leg 4 becomes tighter, and the range of motion of the buoyancy core 22 and the float 1 decreases, making it more stable and beneficial to its service operation. That is, when the float node 2 is under 0 ballast, the tension leg is strongly tensioned, has high stiffness, strong mooring constraint, and the range of motion of the float node 2 and the float is small. When the float node 2 is under ballast, the tension leg is weakly tensioned, has low stiffness, weak mooring constraint, and the range of motion of the float node 2 and the float is large. Figure 4 The dashed line represents the range of motion of float node 2. The height of float node 2 under normal operating conditions is higher than that under typhoon avoidance conditions, and the range of motion of float node 2 under normal operating conditions is smaller than that under typhoon avoidance conditions.

[0026] In one embodiment, such as Figure 1 and Figure 2 As shown, a stiffening plate 27 is provided inside the enclosed cavity 26. The stiffening plate 27 connects the upper plate and the lower plate, and the plane of the stiffening plate 27 passes through the center of the enclosed cavity 26. The interior of the cavity is symmetrically divided by the stiffening plate 27.

[0027] In one embodiment, such as Figure 1 and Figure 2As shown, a central body is provided at the central axis of the enclosed cavity 26. The central body connects the upper plate and the lower plate. Multiple stiffening plates 27 are evenly arranged around the central body. The stiffening plates 27 also connect the central body and the side plates so that a closed chamber is formed between adjacent stiffening plates 27.

[0028] In one embodiment, such as Figure 1 and Figure 2 As shown, the interior of the central body is formed as a cavity structure 7, and the cavity structure 7 serves as an expansion dock for one or more of the following: a distributed booster station, aquaculture feed hopper, peak-shaving battery storage hopper, monitoring base station, and drone hangar. The pump 28 is connected to the power supply equipment inside the cavity structure, such as the peak-shaving battery storage hopper.

[0029] The mooring point interior of this invention can be used as an extended space cabin, and can be used as: a distributed pressurization cabin, an aquaculture feed cabin, a peak-shaving battery storage cabin, a monitoring base station, a drone hangar, etc.

[0030] In one embodiment, such as Figure 1 and Figure 2 As shown, the buoyancy core 22 is connected to the float 1 via the mooring line 3. A dynamic cable 6 is installed on the mooring line 3 so that the float 1 can be connected to the equipment inside the cavity structure, such as the pressurization chamber, via the dynamic cable 6. This facilitates pressurization, grid connection and external transmission, and can also supply power to storage peak shaving and water pumps and other equipment.

[0031] In one embodiment, such as Figure 1 and Figure 2 As shown, mooring line 3 includes anchor cables and / or anchor lines.

[0032] The mooring line 3 connects the buoyancy core 22 to the floating structure and is responsible for transmitting the mooring force provided by the buoyancy core 22. Anchor cables or anchor chains can be selected as the mooring line 3 as needed.

[0033] In one embodiment, such as Figure 1 and Figure 2 As shown, multiple pumps 28 are configured and are located in enclosed chambers, or, for example, in the case where some pumps are not located in enclosed chambers, through holes are provided on the stiffening plate 27, and control devices for controlling the opening and closing of the through holes are installed between the enclosed chambers to seal the through holes corresponding to damaged enclosed chambers.

[0034] In one embodiment, such as Figure 1 and Figure 2 As shown, the anchoring foundation 5 includes one or more of gravity anchors, pile anchors, and suction anchors.

[0035] Anchorage foundation 5 provides anchoring force for the entire mooring system. Anchorage foundation 5 primarily bears the pull-out force, which is confined to the tension cable's deflection limit angle. Therefore, an anchorage foundation 5 capable of bearing loads in all directions must be selected. Gravity anchors, pile anchors, suction anchors, or combinations thereof can be selected based on the corresponding load level. Suction anchors are preferred.

[0036] In one embodiment, such as Figure 1 and Figure 2 As shown, the tension leg 4 includes a tensioning cable, and the tension leg 4 is kept taut so that when the float 1 and the buoyancy core 22 are deviated from their positions under load, the tensioning cable stretches to its limit length under the load level to provide mooring force, limit the displacement of the buoyancy core 22, and provides restoring force to the buoyancy core 22 and the float 1 by generating additional tension through stretching.

[0037] The tension cable connects the buoyancy core 22 and the anchoring foundation 5. The upper end of the tension cable connects to the fixing device at the bottom of the buoyancy core 22, and the lower end connects to the anchoring point of the anchoring device. The tension cable is always under tension. When the floating structure and the buoyancy core 22 deviate from their positions under load, the tension cable stretches to its limit length under this load level to provide mooring force, limit the displacement of the buoyancy core 22, and generate additional tension to provide restoring force for the buoyancy core 22 and the floating structure. Multiple sets of symmetrical tension cables can be installed on a single buoyancy core 22. During installation, it must be ensured that all tension cables are parallel and of equal length. If the tension of the tension cables is inconsistent, the buoyancy core 22 will be in an unbalanced state, thus affecting its performance.

[0038] In one embodiment, such as Figure 1 and Figure 2 As shown, an outer frame 21 is attached to the outside of the buoyancy core 22, and the outer frame 21 is connected by rods to form a cage shape.

[0039] The outer frame 21 encloses the buoyancy core 22, bearing all external loads and protecting the buoyancy core 22. The frame of the buoyancy core 22 is welded to the outer frame 21 via reinforcing members. The outer frame 21 is constructed of welded steel pipes, with columns on its outer ring. These columns are connected by crossbeams and diagonal braces, forming a welded frame system that encloses the core in all directions. The sides of the buoyancy core 22 have equidistant anchoring points 23 for connecting the mooring line 3. Balancing buoys 24 are arranged circumferentially at the bottom of the buoyancy core 22, with tensioning cable fixing points 25 located below them.

[0040] This specification also discloses a self-lifting variable stiffness floating shared mooring system, such as... Figure 1 and Figure 2As shown, the system includes multiple floating bodies 1, multiple shared mooring points, and mooring lines 3 connecting the floating bodies 1 and the shared mooring points. The shared mooring points include float nodes 2, tension legs 4, and anchoring foundations 5. The float nodes 2 are buoyant structures. The anchoring foundations 5 are fixed to the seabed. One end of the tension leg 4 is connected to the anchoring foundation 5, and the other end of the tension leg 4 is connected to the float nodes 2, so that the tension leg 4 is kept taut by the buoyancy of the float nodes 2. Each float node 2 is connected to multiple adjacent floating bodies 1 through the mooring lines 3, and adjacent floating bodies 1 are connected to each other through the float nodes 2, so that each floating body 1 is connected to multiple float nodes 2 through the mooring lines 3.

[0041] Float node 2, together with the tension leg system and the anchoring system, constitutes the mooring foundation. Under working conditions, float node 2 should have sufficient buoyancy to keep the tension leg in a taut state at all times, although the degree of tension can vary. Therefore, it is necessary to adjust the buoyancy range of float node 2 according to the required mooring force of float 1. The buoyancy range that float node 2 can provide was determined through mechanical analysis, and thus the volume of float node 2 was determined.

[0042] Floating body 1, or floating structure, is connected to float nodes 2 via mooring lines 3. Each float node 2 is symmetrically connected to n mooring lines 3 at equal intervals on its sides, where n is greater than or equal to 2. Floating nodes 2 are connected to anchoring foundations 5 via tension legs. For example, one floating body 1 connects to three float nodes 2, and one float node 2 connects to three floating bodies 1, completing the mooring of the floating structure cluster. Floating nodes 2 can be positioned at the sea surface or between the sea surface and the seabed, and the mooring point height is increased via tension legs 4 and float nodes 2.

[0043] like Figure 1 and Figure 3 As shown, when the floating structure is subjected to external loads, the load transfer route is: floating structure - mooring line 3 - float node 2 - tension leg 4 - anchoring foundation 5. When the floating structure drifts under the action of external loads, it pulls on the mooring line 3, which transfers this load to the float node 2, causing the float node 2 to shift. This shifts the top of the tension cable, which is fixed to the anchoring foundation 5 at the bottom, providing anchoring force for the entire system.

[0044] The restoring force transmission route is: tension leg 4 - float node 2 - mooring line 3 - floating structure. When the external load disappears / weakens, under the tension of the tension cable, float node 2 tends to return to its initial position. This tension will keep float node 2 and the floating structure connected to it within a certain range.

[0045] This invention establishes a floating shared mooring point by setting up float nodes 2 and corresponding anchoring foundations 5, thereby raising the shared mooring point from the seabed to a certain height. This interconnects the shared mooring point and the floating structure group, forming a unified floating entity. The movement disturbances of a single float 1 can be transmitted to the surrounding area of ​​the disturbance source via the mooring line 3, dispersing the impact of the disturbance throughout the entire floating network. This effectively reduces the stress on each individual shared anchoring foundation 5, allowing for further reduction in the size and shape of the shared anchor, effectively lowering construction and installation costs and demonstrating excellent economic efficiency.

[0046] This invention's shared mooring system avoids direct connection of multiple mooring lines 3 to the same anchorage foundation 5, solving the problems of erosion and cutting of the surrounding soil, thus ensuring the bearing capacity of the anchorage foundation 5. The layout of this shared mooring system is unaffected by water depth, making it applicable to both shallow and deep water. It addresses the cost limitations of deploying small floating structures in shallow water and large / ultra-large floating structures in deep water, enriching the application scenarios of floating structure groups and providing good compatibility. In this shared mooring system, the connection between the floating structures and the float nodes 2 effectively reduces the spacing between floats 1, improving sea area utilization efficiency and increasing production density.

[0047] This invention avoids anchor chain erosion of the seabed, reducing maintenance costs. It is environmentally friendly: mooring line 3 does not contact the seabed, avoiding soil damage and reducing environmental impact. It also enhances safety: the overall integrity and stability of the floating body 1 cluster are strengthened, resulting in excellent resistance to wind and waves. This invention employs a clustered system, with floating body 1 and the shared mooring point forming a unified cluster, responding collectively to environmental loads; improving the utilization rate of floating body 1 and reducing construction and maintenance costs. Furthermore, this invention is scalable: the modular design supports large-scale cluster deployment, expanding the application scenarios of shared mooring. This invention incorporates mechanical innovation; the combined system of anchoring foundation 5, tension leg 4, shared mooring point, mooring line 3, and floating body 1 achieves a stable response of "semi-compliant, semi-rigid + catenary compliant". This invention optimizes costs by effectively reducing the length of anchor chains and the number of anchoring foundations, thereby lowering construction and maintenance costs. The self-lifting variable stiffness shared mooring system of this invention, through innovative floating shared mooring point technology, achieves economic efficiency and high efficiency in the construction of floating body clusters, as well as the safety and stability of mooring, and the flexibility and convenience of operation and maintenance. This provides a technical and equipment foundation for the clustered and large-scale development of marine floating body equipment.

[0048] In one embodiment, such as Figure 2 As shown, the float node 2 includes a buoyancy core 22 and an outer frame 21. The outer frame 21 is connected by rods to form a cage shape, which is responsible for transmitting external loads, and the buoyancy core 22 is fitted inside the outer frame 21. The rods are, for example, steel rods, making the outer frame 21 a steel frame.

[0049] The present invention provides a self-lifting variable stiffness floating shared mooring system, which includes a float node 2, a mooring line 3, a tensioning cable, and an anchoring foundation 5. The float node 2 is composed of an internal buoyancy core 22 and an external frame 21. The buoyancy core 22 is located inside the float.

[0050] In one embodiment, such as Figure 2 As shown, the side members of the outer frame 21 include vertical members and horizontal members. The vertical members are arranged around the buoyancy core 22 and connected to each other by horizontal members. The horizontal members connect to the vertical members at their two ends. Anchoring points 23 for connecting the mooring line 3 are provided on the vertical members, and reinforcing members are also connected to the vertical members at the anchoring points 23. The anchoring points 23 can be anchor rings. There are at least three vertical members, preferably twelve. The outer frame 21 is three-dimensional, and the upper and lower horizontal members of the outer frame 21 form polygons corresponding to the number of vertical members.

[0051] In one embodiment, such as Figure 2 As shown, one end of each lower member of the outer frame 21 is connected to the lower end of each vertical member, and the other end of each lower member of the outer frame 21 is connected to the same position on the center line of the buoyancy core 22. Multiple balancing floats 24 are provided on the lower members of the outer frame 21 corresponding to the lower ends of some vertical members, and the balancing floats 24 are evenly arranged around the buoyancy core 22. A fixing point 25 for connecting the tension leg 4 is provided below the balancing floats 24.

[0052] One end of each upper member of the outer frame 21 is connected to the upper end of the vertical member, and the other end of each upper member of the outer frame 21 is connected to the same position on the center line of the buoyancy core 22.

[0053] In one embodiment, such as Figure 1 and Figure 2 As shown, the tension leg 4 includes a tensioning cable. Multiple tension legs 4 are of equal length and have the same tension. When the float 1 and float node 2 deviate from their positions under load, the variable stiffness tensioning cable stretches to its limit length under the current load level to provide mooring force, limit the displacement of the float node 2, and generate additional tension to provide restoring force for the float node 2 and float 1. The tensioning cable can be an elastic tensioning cable. The variable stiffness tension leg 4 of this invention, used in catenary mooring, provides controllable restoring force, improving the safety and stability of the float cluster.

[0054] In one embodiment, such as Figure 2As shown, the buoyancy core 22 includes a hollow, sealed closed cavity 26; a pump 28 that can be autonomously controlled or remotely operated is installed inside the closed cavity 26, and the pump 28 is used to control the ballast water volume inside the closed cavity 26 to adjust the ballast level of the buoyancy core 22, thereby controlling the buoyancy of the float node 2 and adjusting the tension of the tension leg 4, so as to adjust the degree of constraint on the float 1.

[0055] The float node 2 of this invention, employing an adjustable ballast design with a cavity-type buoyancy core 22 and tensioning cables, enables height adjustment of the floating shared mooring point. This controls the mooring constraint strength of the shared mooring point on the floating body 1 structure, facilitating compliance with different operating conditions and effectively reducing fatigue damage to the mooring system under extreme sea conditions, thereby increasing the service life and safety of the mooring system. Furthermore, this characteristic gives the shared mooring system of this invention excellent compatibility; the same shared mooring system can be applied to different floating structure groups, exhibiting good scalability. Moreover, the interior of the float node 2 of this invention can be planned with special spaces as relay expansion spaces for the floating structure group.

[0056] The floating shared mooring point of this invention has an adjustable height and a self-lifting design, which breaks through the water depth limitation and enables flexible deployment; it can store excess energy from the surrounding floating bodies and use it as power for water pumps.

[0057] In one embodiment, the mooring line 3 includes anchor cables and / or anchor lines; the anchoring foundation 5 includes, but is not limited to, one or more of gravity anchors, pile anchors and suction anchors; the floating body 1 includes, but is not limited to, one or more of floating wind turbines, floating photovoltaic platforms, aquaculture cages, tidal turbines and coast guard base stations.

[0058] In this invention, the floating body 1 structure is not limited to a specific type of platform; it can be any form of floating structure, such as a floating wind turbine, a floating photovoltaic platform, an aquaculture cage, a tidal power turbine, a coastal defense base station, etc. Figure 1 Take the three-column floating fan as an example.

[0059] In one embodiment, a dynamic cable 6 or a feed pipe is arranged on the mooring line 3. The dynamic cable 6 can be used for power transmission between floats 1, or to supply power to the pump body through the floats 1, which can avoid the dynamic cable 6 from being damaged by friction with the seabed; the feed pipe can be used to transport materials between aquaculture cages.

[0060] For structures that require the deployment of dynamic submarine cables, the mooring line 3 between the floating structure and the float node 2 can serve as the anchorage for the dynamic submarine cable, eliminating the need for additional gravity blocks.

[0061] The core design concept of this invention is to "lift" the shared mooring point from the seabed to a controllable underwater depth, and connect it to the anchoring foundation 5 via a semi-compliant, semi-rigid tension leg 4, forming a support and recovery mechanism for the floating cluster. This invention utilizes a self-lifting floating body with a shared mooring point, employing a float-tensioning system to raise the shared mooring point to any depth between the sea surface and the seabed, achieving a height-adjustable floating shared mooring point. This controls the mooring constraint strength of the shared mooring point on the floating body 1 structure, effectively reducing fatigue failure. This invention provides recovery force through the tension of the mooring line 3 and the tension cable, eliminating the need for a long anchor chain, thus effectively reducing the mooring radius. The shared mooring point and the anchoring foundation 5 are connected by the length of the tension leg 4, unrestricted by water depth, allowing for deployment in both shallow and deep water. Through the floating body cluster structure, the shared mooring point and the floating body 1 structure together form a floating body cluster, resulting in strong integrity, superior hydrodynamic characteristics, and greater safety for the floating body group. The mooring line 3 does not contact the seabed, effectively avoiding soil erosion problems.

[0062] The self-lifting variable stiffness shared mooring system of the present invention differs from traditional shared mooring systems. The most significant feature of this mooring system is that its shared mooring point is not fixed to the seabed surface, but is raised to a certain depth range between the sea surface and the seabed surface through a specially designed buoyancy-tensioning system. This breaks through water depth limitations, improves the safety and stability of the floating body cluster, and reduces construction and operation and maintenance costs.

[0063] Each floating structure is connected to a float node 2 via mooring line 3, and the float node 2 is connected to an anchoring foundation 5 via tension cable, thus completing the mooring of the floating structure cluster. Compared to existing mooring methods, this mooring system increases the mooring point height and provides restoring force through the tension of the mooring line 3 and the tension cable, eliminating the need for a long anchor chain and thus reducing the mooring radius. Simultaneously, the floating mooring points eliminate the influence of water depth on the shared mooring system, allowing for deployment in both shallow and deep water. In this invention, the floating mooring points and the floating platform together form part of the floating body cluster, resulting in better overall integrity of the floating body cluster and improved safety and stability of the floating structure cluster. Furthermore, this design prevents the mooring anchor line from contacting the seabed, effectively solving the problem of anchor chain erosion of the soil around the shared anchoring foundation 5. The floating anchor point shared mooring system has a simple structure, wide applicability, and is easy to construct, install, and maintain. It improves the utilization rate and safety of marine floating equipment, effectively reduces the development and maintenance costs of floating platform clusters, and fully leverages the advantages of floating platform clusters and large-scale development.

[0064] This invention aligns with the future trend of clustered and large-scale development of marine structures, and is particularly significant in reducing the cost of marine development and maintenance, as well as improving structural safety and stability.

[0065] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A cavity-type floating mooring point structure, characterized in that, It includes an anchoring foundation, a buoyancy core, and tension legs. One end of the tension legs is connected to the anchoring foundation, and the other end is connected to the buoyancy core. The buoyancy core is used to connect the floating body, and the anchoring foundation is used to connect the seabed surface. The buoyancy core includes an upper plate, a lower plate, and a side plate located between the upper and lower plates. The side plate is arranged around the edge of the upper plate so that the side plate, the upper plate, and the lower plate form a closed cavity. A pump is installed in the closed cavity, and the pump is used to control the water volume in the closed cavity to adjust the ballast of the buoyancy core, control the buoyancy of the buoyancy core and the tension of the tension legs, and adjust the degree of constraint on the floating body.

2. The cavity-type floating mooring point structure according to claim 1, characterized in that, A stiffening plate is provided inside the enclosed cavity. The stiffening plate is connected between the upper plate and the lower plate, and the plane of the stiffening plate passes through the center of the enclosed cavity.

3. The cavity-type floating mooring point structure according to claim 2, characterized in that, A central body is provided at the central axis of the enclosed cavity. The central body connects the upper plate and the lower plate. Multiple stiffening plates are evenly arranged around the central body. The stiffening plates also connect the central body and the side plates, so that an enclosed chamber is formed between adjacent stiffening plates.

4. The cavity-type floating mooring point structure according to claim 3, characterized in that, The interior of the central body is formed into a cavity structure, and the cavity structure serves as an expansion dock for one or more of the following purposes, including but not limited to a distributed booster chamber, aquaculture feed chamber, peak-shaving battery storage chamber, monitoring base station, and drone hangar. The pump is connected to the power supply equipment inside the cavity structure.

5. The cavity-type floating mooring point structure according to claim 4, characterized in that, The buoyancy core is connected to the float via a mooring line, and a dynamic cable is provided on the mooring line to connect the float to the equipment inside the cavity structure via the dynamic cable.

6. The cavity-type floating mooring point structure according to claim 5, characterized in that, The mooring line includes anchor cables and / or anchor lines.

7. The cavity-type floating mooring point structure according to claim 3, characterized in that, The pumps are configured as multiple pumps, each located in a closed chamber. Alternatively, the stiffening plate is provided with through holes, and a control device is installed between the closed chambers to control the opening and closing of the through holes, so as to seal the through holes corresponding to the damaged closed chambers.

8. The cavity-type floating mooring point structure according to any one of claims 1 to 7, characterized in that, The anchoring foundation includes one or more of gravity anchors, pile anchors, and suction anchors.

9. The cavity-type floating mooring point structure according to any one of claims 1 to 7, characterized in that, The tension leg includes a tension cable, and the tension leg remains taut so that when the float and buoyancy core are deviated from their positions under load, the tension cable stretches to its limit length under the current load level to provide mooring force, limit the displacement of the buoyancy core, and provide restoring force to the buoyancy core and float by generating additional tension through stretching.

10. The cavity-type floating mooring point structure according to any one of claims 1 to 7, characterized in that, The buoyancy core is attached to the outer frame, and the outer frame is connected by rods to form a cage shape.

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