A large-stroke quick-lifting composite tendon tension leg platform and a construction method thereof

Abstract

The application provides a composite tendon tension leg platform with large stroke and rapid lifting and a construction method thereof, and aims to solve the technical problems of poor stability of the existing floating platform, and large tension difficulty and low efficiency of the tendon. The composite tendon tension leg platform comprises a floating frame and a gravity anchor. The floating frame comprises an elevated platform and a deep diving float. The elevated platform is connected with the gravity anchor through a plurality of first tension tendons. The first tension tendons are used for adjusting the depth of the floating frame submerged in water. The deep diving float is connected with the gravity anchor through a plurality of second tension tendons. The composite tendon tension leg platform can rapidly tension the tension tendons, can adjust the height of the platform from water as required, has high stability and is easy to construct, and is suitable for various scenes.

Description

Technical Field

[0001] This invention relates to the field of floating platforms and their construction, and in particular to a composite tendon tension leg platform with a large stroke and rapid lifting and lowering, and its construction method. Background Technology

[0002] With the deepening development and utilization of marine resources, floating structures are increasingly widely used in offshore energy development (such as wind power and photovoltaics) and marine engineering facilities (such as sightseeing platforms and aquaculture cages). Tension leg platforms, with their stability, deep-water adaptability, and economic efficiency, have become one of the key technologies for deep-sea resource development.

[0003] However, existing tension leg platforms have the following drawbacks: 1. Due to the high cost and complex construction of tension ribs, existing tension leg platforms often employ a simple and singular rib arrangement, as seen in the "Tension Leg Classification Guide GD13-2018," where tension ribs are only installed at a few corners or outriggers at the bottom of the platform. This results in a small number of ribs, low redundancy, high cost, and difficult maintenance, hindering the widespread adoption of tension leg platforms. 2. Existing tension leg platforms primarily use dewatering to adjust the buoyancy of ballast tanks to tension the ribs, which is inefficient and slow to construct. 3. Ballast tanks are constantly submerged at considerable depths. To provide greater buoyancy, the empty tank walls must withstand enormous external water pressure during operation. Furthermore, long-term seawater corrosion is severe, making the design and manufacture of ballast tanks extremely difficult and costly. 4. High complexity of construction and maintenance: The tensioning of tension legs on existing tension leg platforms mostly involves multi-party collaborative operations on the water surface and underwater. Core processes rely heavily on underwater operations, resulting in particularly complex equipment and extremely difficult technology. 5. Insufficient functional scalability: Most floating structures are designed with limited functionality, making it difficult to adapt to diverse application scenarios. For example, while oil production platforms utilize tension leg structures, they are difficult to adapt to offshore wind turbine platforms or aquaculture cages because the structural designs of these three types differ significantly. This leads to high costs of repeated development and a lack of modular, scalable, and universal solutions.

[0004] To address the aforementioned issues, patent applications CN117284434A and CN116788446A modified the original method of connecting the tension tendons to the underwater float, connecting the tension tendons to the surface platform instead, thus avoiding the significant construction difficulties associated with underwater operations. However, the tensioning method still relies on pumping water from the ballast tanks to create a buoyancy difference, resulting in slow construction speed and high requirements for coordination. Furthermore, considering the underwater pressure-bearing capacity of the ballast tanks, their walls are generally designed to be thick, making it impossible to optimize or reduce the amount of steel used in this area. Summary of the Invention

[0005] The purpose of this invention is to provide a composite tendon tension leg platform with a large stroke and rapid lifting capability, and its construction method. This addresses the technical problems of existing floating platforms, such as complex design, high cost, and low efficiency in tendon tensioning of ballast water tanks.

[0006] A composite tendon tension leg platform with a long stroke and rapid lifting capability includes a floating frame and a gravity anchor, wherein the floating frame includes an elevated platform and a deep-sea floating body;

[0007] The elevated platform, the deep-sea floating body, and the gravity anchor are arranged sequentially from top to bottom at intervals. The elevated platform and the deep-sea floating body are connected by connectors, and the elevated platform and the gravity anchor are connected by several first tension tendons. The first tension tendons are used to adjust the depth of the floating frame submerged in water.

[0008] Optionally, the deep-sea buoy and the gravity anchor are connected by a number of second tension tendons.

[0009] Optionally, the first tension tendon includes a tool cable and a working cable, one end of which is connected to the gravity anchor;

[0010] The elevated platform is equipped with several tensioning mechanisms for tensioning tool cables. The other end of the tool cable is connected to the tensioning mechanism. The other end of the working cable is provided with an adjustment mechanism for adjusting the length of the working cable. The adjustment mechanism is connected to the elevated platform.

[0011] Optionally, the tensioning mechanism is a winch or a long-stroke jack, and the adjusting mechanism is a screw or an anchor chain.

[0012] Optionally, a number of protective skirts are installed on the outer wall of the elevated platform;

[0013] One end of the protective skirt is hinged to the side wall of the elevated platform, and the other end of the protective skirt is equipped with a follow-up float. An energy-dissipating device is connected between the end face of the protective skirt and the elevated platform.

[0014] Optionally, the connector includes a plurality of support rods installed between the elevated platform and the deep-sea buoy.

[0015] Optionally, both the elevated platform and the deep-sea buoy are ring structures, and the connector includes a central column located at the center of the elevated platform and the deep-sea buoy, with both ends of the central column passing through the deep-sea buoy and the elevated platform, respectively.

[0016] The connector also includes a plurality of first prestressed cables, second prestressed cables and third prestressed cables arranged in a ring array. One end of the plurality of first prestressed cables and second prestressed cables is connected in a ring array to the elevated platform and the deep-sea floating body, respectively. The other end of the plurality of first prestressed cables and second prestressed cables is connected to both ends of the central column, respectively. The two ends of the plurality of third prestressed cables are connected in a ring array to the elevated platform and the deep-sea floating body, respectively.

[0017] Optionally, the gravity anchor includes a plurality of spaced-apart anchor blocks, and one end of the plurality of tool cables and working cables is respectively connected to the plurality of anchor blocks.

[0018] Optionally, the gravity anchor is a ring-shaped gravity anchor, which includes several anchor beams connected in sequence to form a ring, and the end faces of adjacent anchor beams are connected by a connector.

[0019] A construction method for a composite tendon tension leg platform with a large stroke and rapid lifting capability, characterized in that the specific steps for constructing the aforementioned composite tendon tension leg platform with a large stroke and rapid lifting capability are as follows:

[0020] S1: Tow the floating frame and gravity anchor to the designated location.

[0021] S2: Lower the gravity anchor to the designated position on the bottom of the water, and connect one end of the first tension tendon and the second tension tendon to the gravity anchor;

[0022] S3: Tow the floating frame above the gravity anchor and connect the other ends of the first and second tension tendons to the elevated platform and the deep-sea floating body, respectively.

[0023] S4: Several tensioning mechanisms simultaneously tighten several tool cables, forcing the floating frame to sink;

[0024] S5: When the floating frame sinks to the predetermined position, the working cable is adjusted and locked by the adjustment mechanism, and then the tool cable is released to transfer the tension on the tool cable to the working cable;

[0025] S6: Adjust the second tension tendon to tighten it.

[0026] Because of the adoption of the above technical solution, the present invention has the following advantages:

[0027] 1. This application sets multiple composite tendons at different positions of the floating frame, which can provide a variety of constraints for the floating platform. Compared with the traditional single tension tendon structure, the platform has higher stability and the structure is safer.

[0028] 2. In this application, the platform uses a winch or long-stroke jack and other tensioning mechanism to achieve rapid lifting and lowering with a large stroke, which facilitates the overall installation of the platform. Compared with the previous watertight ballast tank structure, this application does not require the installation of a watertight tank, nor does it require pumping water to adjust buoyancy, nor does it require the consideration of setting up maintenance passages for maintenance personnel inside the watertight tank, which can significantly reduce costs.

[0029] 3. This application allows the connection and tensioning of the tension leg tendons to be completed directly above the water surface by setting a tensioning device on an elevated platform. This facilitates the use of a fast tensioning device and also makes it convenient for tendon adjustment, maintenance, and replacement operations without relying on complex underwater operating equipment (such as underwater robots or divers), thus significantly reducing construction difficulty and cost.

[0030] 4. The composite tendon tension leg platform of this application can quickly tension the tendons, and the height of the elevated platform above the water can be adjusted as needed. It has high stability, is easy to construct, and is suitable for various scenarios.

[0031] 5. In this application, the tension tendons are inclined at a certain angle or the floating structure uses elevated platforms and deep-sea floating bodies of different diameters to avoid interference and collision between the tension tendons and the platform; this reduces the wear of components and increases the service life of the platform.

[0032] 6. The deep-sea floating body of this application is completely located below the water surface, while the elevated platform is located above the water surface. Only the first tension tendon and the third prestressed cable or support rod cut through the water surface, resulting in a very small waterline area and minimal impact from waves; the platform has high stability.

[0033] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0034] The accompanying drawings of this invention are described below.

[0035] Figure 1 This is a schematic diagram of the elongated tension leg platform in Embodiment 1 of the present invention.

[0036] Figure 2 This is a schematic diagram of the S-shaped tension leg platform in Embodiment 1 of the present invention.

[0037] Figure 3 This is a schematic diagram of the rectangular tension leg platform in Embodiment 1 of the present invention.

[0038] Figure 4 This is a schematic diagram of the U-shaped tension leg platform in Embodiment 1 of the present invention.

[0039] Figure 5 This is a schematic diagram of the annular tension leg platform in Embodiment 1 of the present invention.

[0040] Figure 6 This is a schematic diagram of the continuous annular gravity anchor tension leg platform in Embodiment 2 of the present invention.

[0041] Figure 7 This is a schematic diagram of the structure of the dispersed annular gravity anchor tension leg platform in Embodiment 2 of the present invention.

[0042] Figure 8 This is a schematic diagram of a continuous annular gravity anchor.

[0043] Figure 9 This is a structural diagram of the protective skirt, the follow-up float, and the energy dissipation device.

[0044] Figure 10 This is a cross-sectional view of the floating body segment of the present invention.

[0045] Figure 11 This is a schematic diagram of the winch tensioning and anchor chain adjustment structure of the present invention.

[0046] Figure 12 This is a schematic diagram of the structure of the long-stroke jack tensioning and screw adjustment of the present invention.

[0047] In the diagram: 1-elevated platform; 101-platform plate; 2-deep-sea floating body; 201-floating body segment; 2011-floating body skeleton; 2012-filling foam; 2013-outer shell; 3-gravity anchor; 301-anchor block; 302-anchor beam; 303-connector; 4-connecting piece; 401-support rod; 402-central column; 403-first prestressed cable; 404-second prestressed cable; 405-third prestressed cable; 5-first tension tendon; 501-tool cable; 502-working cable; 6-second tension tendon; 7-tensioning mechanism; 701-winner; 702-long stroke jack; 8-adjusting mechanism; 801-anchor chain; 802-screw; 9-protective skirt; 10-follow-up buoy; 11-energy dissipation device; 12-mesh grid plate; 13-counterweight block. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0049] Example 1:

[0050] like Figure 1 , Figure 2 , Figure 3 and Figure 4The composite tendon tension leg platform with a large stroke and rapid lifting is shown, including a floating frame and a gravity anchor 3. The floating frame includes an elevated platform 1 and a deep-sea floating body 2.

[0051] The elevated platform 1, the deep-sea floating body 2, and the gravity anchor 3 are arranged sequentially from top to bottom at intervals. The elevated platform 1 and the deep-sea floating body 2 are connected by connectors 4. The elevated platform 1 and the gravity anchor 3 are connected by several first tension tendons 5. The first tension tendons 5 are used to adjust the depth of the floating frame submerged in water. The deep-sea floating body 2 and the gravity anchor 3 are connected by several second tension tendons 6. The second tension tendons 6 effectively constrain the displacement and movement of the platform.

[0052] In this embodiment, the elevated platform 1 and the deep-sea floating body 2 each include a plurality of platform plates 101 and a plurality of floating body segments 201 (welded or connected by flanges). The gravity anchor 3 includes a plurality of anchor blocks 301 respectively spaced on both sides of the elevated platform 1. The two sides of the platform plate 101 are connected to the anchor blocks 301 on both sides by a first tension tendon 5. The elevated platform 1 and the deep-sea floating body 2 are connected by a plurality of support rods 401.

[0053] In this embodiment, as Figure 10 As shown, the floating body segment 201 includes a floating body frame 2011, which is covered with a filling foam 2012, and the filling foam 2012 is covered with an outer shell 2013. The deep-sea floating body 2 of this application does not require the installation of a watertight ballast tank, nor does it require pumping out water, nor does it require the consideration of setting up maintenance access for maintenance personnel, which can significantly reduce costs.

[0054] like Figure 1 , Figure 11 and Figure 12 As shown, the first tension tendon 5 includes a tool cable 501 and a working cable 502, one end of which is connected to the gravity anchor 3;

[0055] The elevated platform 1 is equipped with several tensioning mechanisms 7 for tensioning tool cables 501. The other end of the tool cable 501 is connected to the tensioning mechanism 7. The other end of the working cable 502 is provided with an adjustment mechanism 8 for adjusting the length of the working cable 502. The adjustment mechanism 8 is connected to the elevated platform 1.

[0056] As one embodiment of this application, such as Figure 11 As shown, the tensioning mechanism 7 is a winch, the adjustment mechanism 8 is an anchor chain 503 and a chain stopper on the elevated platform 1, and one end of the anchor chain 503 is connected to the working cable 502.

[0057] As another embodiment of this application, such as Figure 12As shown, the tensioning mechanism 7 is a long-stroke jack, and the adjusting mechanism 8 is a screw 504. One end of the screw 504 is rotatably connected to the working cable 502, and the other end of the screw 504 is threadedly connected to the elevated platform 1.

[0058] In this embodiment, as another embodiment of this application, the tool cable 501 can be made of nylon rope, steel wire rope, etc., and the working cable 502 can be made of carbon fiber composite cable. The tool cable 501 is sleeved on the tensioning mechanism 7. When the first tension tendon 5 is tensioned, the tool cable 501 is first tightened by the tensioning mechanism 7. When the platform is adjusted to the predetermined position, the working cable 502 is tensioned and locked by the adjusting mechanism 8, and then the tool cable 501 is released, thereby transferring the tension on the tool cable 501 to the working cable 502, completing the tensioning of the first tension tendon 5. In this embodiment, when the platform needs to be cleaned and maintained, the tool cable 501 is first tightened by the tensioning mechanism 7, then the working cable 502 is released, and finally the tool cable 501 is released by the tensioning mechanism 7, so that the deep-sea floating body 2 can float to the surface, facilitating the cleaning and maintenance of the floating platform.

[0059] In this embodiment, as another embodiment of this application, both the working cable 502 and the second tension tendon 6 are carbon fiber cables, and the working cable 502 and the second tension tendon 6 are a single tension cable. A pull ring is embedded in the gravity anchor 3. The two ends of the tension cable after passing through the pull ring are connected to the deep-sea buoy 2 and the adjustment mechanism 8, respectively. After tensioning by the tensioning mechanism 7, the working cable 502 and the second tension tendon 6 are simultaneously tensioned and locked by the adjustment mechanism 8. Then, the tool cable 501 is released, transferring the tension on the tool cable 501 to the working cable 502 and the second tension tendon 6. This application achieves simultaneous tensioning of the working cable 502 and the second tension tendon 6 in a single tensioning operation, which is completed on the water surface, reducing the difficulty of operation.

[0060] like Figure 9 As shown, several protective skirts 9 are installed on the outer wall of the elevated platform 1;

[0061] One end of the protective skirt panel 9 is hinged to the side wall of the elevated platform 1, and the other end of the protective skirt panel 9 is equipped with a follow-up float 10. An energy dissipation device 11 is connected between the end face of the protective skirt panel 9 and the elevated platform 1.

[0062] In this embodiment, to avoid the risk of the vessel severing the first tension tendon when it docks, a crash skirt 9 is installed on the elevated platform. The energy dissipation device 11 can limit the rotation of the skirt 11 within a certain range, preventing excessive angular deflection from impacting the first tension tendon. In this embodiment, in the initial state, the follower buoy 10 remains in contact with the water surface and rises and falls with the tide. When impacted, the follower buoy 10 and the energy dissipation device 11 can further buffer the impact force and protect the tension tendon. As one embodiment of this application, the energy dissipation device 11 is a spring.

[0063] In this embodiment, the rectangular platform described above can be used to construct, as follows: Figure 1 and Figure 2 The image shows a floating breakwater platform. Figure 1 It is long and narrow. Figure 2 (S-shaped), absorbing waves by installing a mesh grid 12 on at least one side of the elevated platform 1. For example... Figure 3 The image shows a floating platform (which can be used for sightseeing or photovoltaic purposes), such as... Figure 4 The image shows a U-shaped floating platform (which can be used for oil exploration).

[0064] Example 2:

[0065] like Figure 5 , Figure 6 and Figure 7 The composite tendon annular tension leg platform with a large stroke and rapid lifting is shown, including a floating frame and a gravity anchor 3. The floating frame includes an elevated platform 1 and a deep-sea floating body 2.

[0066] The elevated platform 1, the deep-sea floating body 2, and the gravity anchor 3 are arranged sequentially from top to bottom at intervals. The elevated platform 1 and the deep-sea floating body 2 are connected by connectors 4. The elevated platform 1 and the gravity anchor 3 are connected by several first tension tendons 5, which are used to adjust the depth of the floating frame submerged in water. The deep-sea floating body 2 and the gravity anchor 3 are connected by several second tension tendons 6, which effectively constrain the displacement and movement of the platform.

[0067] In this embodiment, both the elevated platform 1 and the deep-sea floating body 2 are annular structures, with the first tension tendons 5 arranged in annular array. The deep-sea floating body 2 includes several floating body segments 201 connected in sequence to form a ring. The elevated platform 1 can be any of a planar truss structure, a spatial truss structure, or a steel pipe. It is assembled from multiple standard segments, and the connection methods of the segments are mainly segment welding and segment bolting.

[0068] In this embodiment, as Figure 10As shown, the floating body segment 201 includes a floating body frame 2011 (arc-shaped frame), the floating body frame 2011 is covered with a filling foam 2012, and the filling foam 2012 is covered with an outer shell 2013 (arc-shaped outer shell). The deep-sea floating body 2 of this application does not require the installation of a watertight ballast tank, nor does it require pumping out water, nor does it require the consideration of setting up maintenance passages for maintenance personnel inside, which can significantly reduce costs.

[0069] As one embodiment of this application, such as Figure 5 As shown, the connector 4 includes several support rods 401 that are positioned between the elevated platform 1 and the deep-sea floating body 2.

[0070] As one embodiment of this application, such as Figure 6 and Figure 7 As shown, the connector 4 includes a central column 402 located at the center of the elevated platform 1 and the deep-sea buoy 2, with both ends of the central column 402 passing through the deep-sea buoy 2 and the elevated platform 1, respectively.

[0071] The connector 4 also includes a plurality of first prestressed cables 403, second prestressed cables 404 and third prestressed cables 405 arranged in a ring array. One end of the plurality of first prestressed cables 403 and second prestressed cables 404 are respectively connected in a ring array to the elevated platform 1 and the deep-sea floating body 2. The other end of the plurality of first prestressed cables 403 and second prestressed cables 404 are respectively connected to both ends of the central column 402. The two ends of the plurality of third prestressed cables 405 are respectively connected in a ring array to the elevated platform 1 and the deep-sea floating body 2.

[0072] In this embodiment, a counterweight 13 can also be installed at the lower end of the central column 402 to lower the overall center of gravity of the platform and further improve the stability of the platform. The spindle-shaped structure formed by the first, second, and third prestressed cables, the elevated platform 1, and the deep-sea floating body 2 has high structural stability.

[0073] As one embodiment of this application, such as Figure 7 As shown, the gravity anchor 3 is a distributed annular gravity anchor, which includes several anchor blocks 301 arranged at intervals, and one end of several tool cables 501 and working cables 502 are respectively connected to several anchor blocks 301.

[0074] In this embodiment, a plurality of anchor blocks 301 are arranged in a circular array. The anchor blocks 301 can be anchor blocks that are sunk to the bottom of the water or anchor piles that are pre-installed in the water.

[0075] like Figure 6 As shown, the gravity anchor 3 is a continuous annular gravity anchor, which includes several anchor beams 302 connected in sequence to form a ring. The end faces of adjacent anchor beams 302 are connected by connectors 303.

[0076] In this embodiment, as Figure 8 As shown, both ends of adjacent anchor beams 302 are provided with connecting buckles, and both ends of connector 303 are respectively connected to the connecting buckles of adjacent anchor beams 302. When the bottom is uneven, the anchor beams 302 can adapt to the topographical undulations of the bottom and are also easy to embed into the bottom silt, thus improving the stability of the annular gravity anchor 3 underwater. As another embodiment of this application, adjacent anchor beams 302 can also be connected by a truss. In this embodiment, the anchor beam 302 can be a hollow concrete box beam with a water inlet. When the anchor beam 302 is towed to a predetermined position, the water inlet is opened to allow the anchor beam 302 to sink.

[0077] like Figure 6 , Figure 7 , Figure 11 and Figure 12 As shown, the first tension tendon 5 includes a tool cable 501 and a working cable 502, one end of which is connected to the gravity anchor 3;

[0078] The elevated platform 1 is equipped with several tensioning mechanisms 8 for tensioning tool cables 501. The other end of the tool cable 501 is connected to the tensioning mechanism 7. The other end of the working cable 502 is provided with an adjustment mechanism 8 for adjusting the length of the working cable 502. The adjustment mechanism 8 is connected to the elevated platform 1.

[0079] As one embodiment of this application, such as Figure 11 As shown, the tensioning mechanism 7 is a winch 701, the adjustment mechanism 8 is an anchor chain 801 and a chain stopper on the elevated platform 1, and one end of the anchor chain 801 is connected to the working cable 502.

[0080] As another embodiment of this application, such as Figure 12 As shown, the tensioning mechanism 7 is a long-stroke jack 702, and the adjusting mechanism 8 is a screw 802. One end of the screw 802 is rotatably connected to the working cable 502, and the other end of the screw 802 is threadedly connected to the elevated platform 1.

[0081] In this embodiment, as one example of this application, the tool cable 501 can be a nylon rope or other tension rope, and the working cable 502 can be a carbon fiber composite cable. The tool cable 501 is sleeved on the tensioning mechanism 7. When the first tension tendon 5 is tensioned, the tool cable 501 is first tightened by the tensioning mechanism 7. When the platform is adjusted to the predetermined position, the working cable 502 is tensioned and fixed by the adjusting mechanism 8, and then the tool cable 501 is released, completing the tensioning of the first tension tendon 5. In this embodiment, when the platform needs to be cleaned and maintained, the tool cable 501 is first tightened by the tensioning mechanism 7, then the working cable 502 is released, and finally the tool cable 501 is released by the tensioning mechanism 7, causing the deep-sea float 2 to surface, facilitating the cleaning and maintenance of the floating frame.

[0082] In this embodiment, as another embodiment of this application, both the working cable 502 and the second tension tendon 6 are carbon fiber cables, and the working cable 502 and the second tension tendon 6 are a single tension cable. A pull ring is embedded in the gravity anchor 3. The two ends of the tension cable after passing through the pull ring are connected to the deep-sea buoy 2 and the adjustment mechanism 8, respectively. After tensioning by the tensioning mechanism 7, the working cable 502 and the second tension tendon 6 are simultaneously tensioned and locked by the adjustment mechanism 8. Then, the tool cable 501 is released, transferring the tension on the tool cable 501 to the working cable 502 and the second tension tendon 6. This application achieves simultaneous tensioning of the working cable 502 and the second tension tendon 6 in a single tensioning operation, which is completed on the water surface, reducing the difficulty of operation.

[0083] like Figure 6 and Figure 7 As shown, several protective skirts 9 are installed on the outer wall of the elevated platform 1;

[0084] One end of the protective skirt panel 9 is hinged to the side wall of the elevated platform 1, and the other end of the protective skirt panel 9 is equipped with a follow-up float 10. An energy dissipation device 11 is connected between the end face of the protective skirt panel 9 and the elevated platform 1.

[0085] In this embodiment, to avoid the danger of a ship colliding with and breaking the first tension tendon, a crash skirt 9 is installed on the elevated platform. The energy dissipation device 11 can limit the rotation of the skirt 9 within a certain range, preventing excessive angular deflection from impacting the first and second tension tendons. In this embodiment, in the initial state, the follower buoy 10 remains in contact with the water surface and floats slowly up and down with the tidal range. When impacted, the follower buoy 10 sinks into the water surface to further buffer the impact force and absorb kinetic energy. As one embodiment of this application, the energy dissipation device 11 is a spring.

[0086] In this embodiment, as Figure 5The image shows a ring-shaped floating platform. A net can be fitted onto the floating frame to form a floating aquaculture cage. A platform board can be installed on the top of the floating frame to form a sightseeing platform or a photovoltaic platform. A wind power tower can be installed on the top of the central column 402 to form a floating wind power platform.

[0087] Example 3:

[0088] A construction method for a composite tendon tension leg platform with large stroke and rapid lifting, characterized in that it is used for the construction of the composite tendon tension leg platform with large stroke and rapid lifting as described in Example 1 or Example 2, and the specific steps are as follows:

[0089] S1: Tow the floating frame and gravity anchor 3 to the predetermined location;

[0090] S2: Lower the gravity anchor 3 to the designated position on the bottom of the water, and connect one end of the first tension tendon 5 and the second tension tendon 6 to the gravity anchor 3;

[0091] In this embodiment, the tension tendon is a zero-wet-weight carbon fiber cable. When one end of it is connected to the gravity anchor 3, the other end floats on the water. Alternatively, a floating buoy can be attached to the other end of the tension tendon, and the buoyancy of the buoy can be used to make the other end of the tendon float to the surface of the water.

[0092] As one embodiment of this application, the working cable 502 and the second tension tendon 6 are a tension cable. A pull ring is embedded in the gravity anchor 3. The tension cable passes through the pull ring. During towing, both ends of the tension cable float on the water surface. When towing to the desired position, one end of the tension cable is first connected to the deep-sea floating body 2, and the other end of the tension cable serves as the tensioning end of the tool cable 502.

[0093] S3: Tow the floating frame above the gravity anchor 3, and connect the other ends of the first tension tendon 5 and the second tension tendon 6 to the elevated platform 1 and the deep-sea floating body 2 respectively.

[0094] In this embodiment, the tool cable 501 is connected to the tensioning mechanism 7 (winch or long-stroke jack), and the tensioning end of the working cable 502 is connected to the elevated platform 1 (clamp or threaded connection).

[0095] S4: Several tensioning mechanisms 7 simultaneously tighten several tool cables 501, forcing the floating frame to sink;

[0096] In this embodiment, several tensioning mechanisms 7 are tensioned simultaneously, and the stroke is controlled by a braking system.

[0097] S5: When the floating frame sinks to the predetermined position, the working cable 502 is adjusted and locked by the adjusting mechanism 8, and then the tool cable 501 is released to transfer the tension on the tool cable 501 to the working cable 502.

[0098] S6: Adjust the second tension tendon 6 to tighten it.

[0099] In this embodiment, as one example of this application, when the second tension tendon 6 and the working cable 502 are two separate cables, the underwater second tension tendon 6 is quickly tightened and locked by a ratchet device and a quick-connect buckle provided on the deep-sea float 2. As another example of this application, when the second tension tendon 6 and the working cable 502 are a single tension cable, the second tension tendon 6 and the working cable 502 can be synchronously tensioned by sequentially using a tensioning mechanism and an adjusting mechanism.

[0100] In this embodiment, the tensioning end of the first tension tendon 5 is set on an elevated platform. By setting the tensioning device of the tension tendon on the platform, the tensioning construction of the first tension tendon 5 is carried out on the water, avoiding complex and difficult underwater construction, facilitating the use of a fast tensioning device, and also facilitating tendon adjustment, maintenance, replacement and other operations. It does not require reliance on complex underwater operation equipment (such as underwater robots or divers), greatly reducing construction difficulty and cost.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A composite tendon tension leg platform with a large stroke and rapid lifting capability, characterized in that, It includes a floating frame and a gravity anchor (3), wherein the floating frame includes an elevated platform (1) and a deep-sea floating body (2); The elevated platform (1), the deep-sea floating body (2) and the gravity anchor (3) are arranged in sequence from top to bottom at intervals. The elevated platform (1) and the deep-sea floating body (2) are connected by connectors (4). The elevated platform (1) and the gravity anchor (3) are connected by several first tension tendons (5). The first tension tendons (5) are used to adjust the depth of the floating frame submerged in water. The first tension tendon (5) includes a tool cable (501) and a working cable (502). One end of the tool cable (501) and the working cable (502) are both connected to the gravity anchor (3). Several tensioning mechanisms (7) for tensioning the tool cable (501) are installed on the elevated platform (1). The other end of the tool cable (501) is connected to the tensioning mechanism (7). The other end of the working cable (502) is provided with an adjustment mechanism (8) for adjusting the length of the working cable (502). The adjustment mechanism (8) is connected to the elevated platform (1). Several protective skirts (9) are installed on the outer wall of the elevated platform (1). One end of the protective skirt (9) is hinged to the side wall of the elevated platform (1). The other end of the protective skirt (9) is equipped with a follow-up float (10). An energy-consuming device (11) is connected between the end face of the protective skirt (9) and the elevated platform (1). The elevated platform (1) and the deep-sea floating body (2) are both ring structures. The connector (4) includes a central column (402) located at the center of the elevated platform (1) and the deep-sea floating body (2). The two ends of the central column (402) pass through the deep-sea floating body (2) and the elevated platform (1), respectively. The connector (4) also includes a plurality of first prestressed cables (403), second prestressed cables (404) and third prestressed cables (405) arranged in a ring array. One end of the plurality of first prestressed cables (403) and second prestressed cables (404) are connected in a ring array to the elevated platform (1) and the deep-sea floating body (2), and the other end of the plurality of first prestressed cables (403) and second prestressed cables (404) are connected to the two ends of the central column (402), respectively. The two ends of the plurality of third prestressed cables (405) are connected in a ring array to the elevated platform (1) and the deep-sea floating body (2), respectively.

2. The composite tendon tension leg platform with large stroke and rapid lifting as described in claim 1, characterized in that, The deep-sea buoy (2) is connected to the gravity anchor (3) by a number of second tension tendons (6).

3. The composite tendon tension leg platform with large stroke and rapid lifting as described in claim 1, characterized in that, The tensioning mechanism (7) is a winch or a long-stroke jack, and the adjusting mechanism (8) is a screw or an anchor chain.

4. The composite tendon tension leg platform with large stroke and rapid lifting as described in claim 1, characterized in that, The connector (4) includes a number of support rods (401) installed between the elevated platform (1) and the deep-sea floating body (2).

5. The composite tendon tension leg platform with large stroke and rapid lifting as described in claim 1, characterized in that, The gravity anchor (3) includes a number of anchor blocks (301) spaced apart, and one end of a number of tool cables (501) and working cables (502) are respectively connected to the number of anchor blocks (301).

6. The composite tendon tension leg platform with large stroke and rapid lifting as described in claim 1, characterized in that, The gravity anchor (3) is a ring-shaped gravity anchor, which includes several anchor beams (302) connected in sequence to form a ring. The end faces of adjacent anchor beams (302) are connected by connectors (303).

7. A construction method for a composite tendon tension leg platform with a large stroke and rapid lifting capability, characterized in that, The specific steps for constructing the composite tendon tension leg platform with large stroke and rapid lifting as described in any one of claims 1-6 are as follows: S1: Tow the floating frame and gravity anchor (3) to the predetermined location. S2: Lower the gravity anchor (3) to the designated position on the bottom of the water, and connect one end of the first tension tendon (5) and the second tension tendon (6) to the gravity anchor (3); S3: Tow the floating frame above the gravity anchor (3) and connect the other ends of the first tension tendon (5) and the second tension tendon (6) to the elevated platform (1) and the deep-sea floating body (2) respectively; S4: Several tensioning mechanisms (7) simultaneously tighten several tool cables (501) to force the floating frame to sink; S5: When the floating frame sinks to the predetermined position, the working cable (502) is adjusted and locked by the adjusting mechanism (8), and then the tool cable (501) is released to transfer the tension on the tool cable (501) to the working cable (502); S6: Adjust the second tension tendon (6) to tighten it.

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