Quick tie-back method for three-stand-column floating type wind power mooring system

Abstract

The invention discloses a quick tie-back method for a three-stand-column floating type wind power mooring system. The quick tie-back method comprises the following processes of laying mooring cables in water, entering a foundation platform, tie-back of a first stand column mooring cable, tie-back of a second stand column mooring cable and a third stand column mooring cable and tensioning of the mooring cables. A floating body device is adopted, and a set of underwater mooring cables and connection between the set of underwater mooring cables and a set of upper anchor chains can be fixed at a time. By adopting the anchor chain lifting appliance, the lifting and tensioning of the upper section of anchor chain can be completed at one time. A crane ship is used for anchoring and positioning, and a DP crane ship is used for hoisting and tensioning an upper anchor chain. The three DP three-purpose ships are adopted for fishing and dragging the mooring line in water and completing connection with an upper anchor chain, tie-back of the mooring line can be rapidly and flexibly completed through cooperative operation of the crane ship, the DP crane ship and the DP three-purpose working ship, sufficient preparation time is reserved for later fan installation, and the mooring line can be rapidly and flexibly connected. And an efficient, safe and reliable construction scheme is provided for offshore wind power.

Description

Technical Field

[0001] This invention relates to a rapid reconnection method for a three-post floating wind turbine mooring system. Background Technology

[0002] A floating wind turbine consists of four parts: a floating platform, a mooring system, the wind turbine itself, and dynamic submarine cables. The mooring system uses anchors, chains, and cables to hold the floating platform at sea, limiting drift caused by external forces and maintaining it in a predetermined position. The purpose is to limit and reduce its movement under the influence of wind, waves, and currents. In shallow waters, chains are commonly used as mooring cables for floating wind turbines because their weight and ability to absorb dynamic loads are strong, allowing for mooring depths of 200 to 300 meters. For deeper waters, a combination of steel cables, fiber polyester cables, and chains is used, reaching depths of over 1000 meters. Subsea anchoring of the mooring system typically employs towed anchors with high holding power, suction anchors, pile anchors, and gravity anchors. After the mooring cable is laid on the seabed, it needs to be connected to the floating foundation of the floating wind power equipment or the floating platform of the wind turbine. However, the connection between the floating platform and the mooring cable requires a sufficiently long working window, and this connection operation is greatly affected by the weather. In particular, for floating platforms with wind turbines or floating foundations with wind power equipment, after the mooring cable is laid, it may not be able to be connected to the floating platform or floating foundation in time due to weather conditions. In addition, the traditional anchor chain reconnection method is often time-consuming and complicated to operate, which brings great inconvenience to offshore operations. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing methods and provide a rapid reconnection method for a three-post floating wind power mooring system, which can improve the construction efficiency of mooring cable connection operations.

[0004] The technical solution to achieve the above objectives is: a rapid reconnection method for a three-pillar floating wind power mooring system, which employs one crane vessel, one DP crane vessel, three DP multi-purpose vessels, three floating body devices, and two anchor chain spreaders;

[0005] The floating device includes a float, two steel wire ropes, and two weight blocks; a float lifting lug is fixed to the center of the top surface of the float; a connecting lug is symmetrically fixed to both sides of the float; a set of mooring lugs is fixed at intervals on the bottom surface of the float; the upper ends of the two steel wire ropes are fixed to the two connecting lugs of the float in a corresponding manner; the two weight blocks are connected to the lower ends of the two steel wire ropes in a corresponding manner and rest on the seabed.

[0006] The anchor chain lifting device includes a lifting plate, a crane lug connected to the middle of the top surface of the lifting plate, and a set of anchor chain lugs fixed to the front surface of the lifting plate;

[0007] The rapid reconnection method for the mooring cable includes the following steps: laying the mooring cable in the water, entering the foundation platform, reconnecting the mooring cable of the first column, reconnecting the mooring cables of the second and third columns, and tensioning the mooring cable.

[0008] The process of laying mooring cables in water includes the following steps:

[0009] S11, first connect the lower ends of the first to third sets of underwater mooring cables to the first to third sets of suction anchors one by one, and then lay the first to third sets of underwater mooring cables radially on the seabed.

[0010] S12. Connect the upper ends of the first to third sets of underwater mooring cables to a set of mooring lugs on the first to third floating bodies, then install slings on the floating lugs of the first to third floating bodies, hook the crane to the slings, and finally lower the first to third floating bodies into the water using the crane until the two weight blocks on each floating body are symmetrically placed on the seabed below the corresponding sides of the floating body, and the set of mooring lugs on each floating body are pressed below the water surface, so that the upper ends of the first to third sets of underwater mooring cables are all below the water surface.

[0011] The basic platform onboarding process includes the following steps:

[0012] S21. The three-column foundation platform is towed to the site location. A set of universal joints is installed side by side on the top of the outer end face of the first column of the three-column foundation platform. The first set of chain stoppers and the second set of chain stoppers are installed on the top of the outer end face of the second column and the top of the outer end face of the third column of the three-column foundation platform, respectively.

[0013] S22. First, connect the upper end of the first set of upper anchor chains to a set of universal joints, and then coil the first set of upper anchor chains on the top surface of column No. 1.

[0014] S23. Connect the upper end of the second set of upper anchor chains to a set of anchor chain lifting lugs on the first anchor chain lifting device through the first set of connecting wire ropes. Pass the lower end of the second set of upper anchor chains downwards through the first set of chain stoppers one by one until the first set of connecting wire ropes also passes through the first set of chain stoppers, so that the first anchor chain lifting device remains on the top surface of the second column. Then coil the second set of upper anchor chains and the first set of connecting wire ropes together on the top surface of the second column.

[0015] S24. Connect the upper end of the third set of upper anchor chains to a set of anchor chain lifting lugs on the second anchor chain lifting device through the second set of connecting wire ropes. Pass the lower end of the third set of upper anchor chains downwards through the second set of chain stoppers one by one until the second set of connecting wire ropes also passes through the second set of chain stoppers, so that the second anchor chain lifting device remains on the top surface of column No. 3. Then coil the third set of upper anchor chains and the second set of connecting wire ropes together on the top surface of column No. 3.

[0016] The procedure for reconnecting the mooring cable to bollard number one includes the following steps:

[0017] S31. The crane ship and the first DP three-purpose vessel are positioned near the first floating device. Divers go underwater to retrieve the first floating device connected to the upper end of the first set of underwater mooring cables. The divers first disconnect the float of the first floating device from the two weight blocks, then hook the float lifting lug on the top surface of the float of the first floating device, and then use the crane on the crane ship to lift the float of the first floating device onto the deck of the first DP three-purpose vessel and temporarily fix it.

[0018] S32. The first DP three-purpose vessel first pulls the upper end of the first set of underwater mooring cables to the vicinity of the No. 1 column. The crane vessel anchors and positions itself with its stern close to the No. 1 column and its midships close to the No. 2 column. Then, the crane on the crane vessel uses its crane to lift the lower end of the first set of upper anchor chains located on the No. 1 column to the first DP three-purpose vessel and connect it to the upper end of the first set of underwater mooring cables. Then, the float of the first floating device on the first DP three-purpose vessel is removed, and the first DP three-purpose vessel withdraws.

[0019] The reconnection process for mooring cables No. 2 and No. 3 includes the following steps:

[0020] S41, the crane vessel anchors and retreats to the midships near column 1 and the bow near column 2; the DP crane vessel enters the site and moves to the stern between column 2 and column 3; the second DP 3-in-1 vessel and the third DP 3-in-1 vessel are positioned near the second and third floating devices respectively.

[0021] S42. Divers descend to salvage the second and third floating devices, disconnecting the float of the second floating device from the two weight blocks and the float of the third floating device from the two weight blocks. Then, they hook up the lifting lugs on the top surface of the float of the second floating device and the lifting lugs on the top surface of the float of the third floating device. The float of the second floating device is lifted onto the deck of the second DP three-purpose vessel and temporarily secured using the crane of the DP crane vessel. The float of the third floating device is lifted onto the deck of the third DP three-purpose vessel and temporarily secured using the crane of the DP crane vessel.

[0022] S43. The second DP three-purpose vessel first tows the upper end of the second set of underwater mooring cables to the second column. Then, the crane of the DP crane vessel connects the lower end of the second set of upper anchor chains on the second column to the upper end of the second set of underwater mooring cables on the second DP three-purpose vessel. Finally, the float of the second floating device on the second DP three-purpose vessel is removed, and the second DP three-purpose vessel withdraws.

[0023] S44. The third DP three-purpose vessel first tows the upper end of the third set of underwater mooring cables to the third column. Then, the crane of the DP crane vessel connects the lower end of the third set of upper anchor chains on the third column to the upper end of the third set of underwater mooring cables on the third DP three-purpose vessel. Finally, the float of the third floating device on the third DP three-purpose vessel is removed, and the third DP three-purpose vessel withdraws.

[0024] The mooring cable tensioning process includes the following steps:

[0025] S51. First, the workers hook the crane lug on the first anchor chain spreader located on the top surface of the second column to the crane of the DP crane vessel. Then, the crane of the DP crane vessel pulls the first set of connecting wire ropes until the upper end of the second set of upper anchor chains is pulled to the position of the first set of chain stoppers. The workers then fix the upper end of the second set of upper anchor chains to the first set of chain stoppers. The mooring cable of the second column is tensioned. The connection between the first set of connecting wire ropes and the second set of upper anchor chains is released, and the first anchor chain spreader is unhooked from the crane of the DP crane vessel.

[0026] S52. First, the workers hook the crane lug on the second anchor chain spreader located on the top surface of the third column to the crane of the DP crane vessel. Then, the crane of the DP crane vessel pulls the second set of connecting wire ropes until the upper end of the third set of upper anchor chains is pulled to the position of the second set of chain stoppers. The workers then fix the upper end of the third set of upper anchor chains to the second set of chain stoppers. The mooring cable tensioning of the third column is completed. The connection between the second set of connecting wire ropes and the third set of upper anchor chains is released, and the second anchor chain spreader is unhooked from the crane of the DP crane vessel. The construction is then completed.

[0027] In the above-mentioned rapid reconnection method for the three-pillar floating wind power mooring system, during step S32 of the reconnection process of the mooring cable of the first pillar, the stern of the crane vessel is positioned with respect to the first pillar and the midship of the crane vessel is positioned with respect to the second pillar via cables. Anti-collision buoys are installed between the stern of the crane vessel and the first pillar and between the midship of the crane vessel and the second pillar.

[0028] In the above-mentioned rapid reconnection method for the three-pillar floating wind power mooring system, during step S41 of the reconnection process of the No. 2 and No. 3 mooring cables, the crane vessel is positioned between the midship and the No. 1 pillar, and between the bow and the No. 2 pillar, by cables. Anti-collision buoys are installed between the midship side of the crane vessel and the No. 1 pillar, and between the bow side of the crane vessel and the No. 2 pillar.

[0029] The rapid reconnection method for the three-post floating wind turbine mooring system of the present invention has the following beneficial effects:

[0030] 1. This invention fully considers the complexity and challenges of the offshore wind power operation environment. It adopts a floating device that can fix a set of underwater mooring cables at one time and complete the connection between a set of underwater mooring cables and a set of upper anchor chains.

[0031] 2. The present invention uses an anchor chain lifting device, which can complete the lifting and tensioning of a set of upper anchor chains in one go, which not only greatly improves construction efficiency, but also effectively reduces construction costs.

[0032] 3. This invention employs one crane vessel for anchoring and positioning, one DP crane vessel for lifting and tensioning the upper section of the anchor chain, and three DP multi-purpose vessels for retrieving and towing the mooring cable in the water and completing the connection with the upper section of the anchor chain. Through the coordinated operation of the crane vessel, DP crane vessel, and DP multi-purpose work vessel, the mooring cable can be reconnected quickly and flexibly, leaving sufficient preparation time for the subsequent wind turbine installation and providing an efficient, safe, and reliable construction solution for offshore wind power operations.

[0033] 4. This invention also fully considers the safety and reliability of offshore operations. During the reconnection of the underwater mooring cable on the universal joint side, the crane vessel and the DP three-in-one workboat work together; during the reconnection of the underwater mooring cable on the chain stopper side, the crane vessel, the DP crane vessel, and the DP three-in-one workboat perform multiple positioning operations to ensure the accurate connection between the upper anchor chain and the underwater mooring cable, providing an efficient, safe, and reliable construction solution for offshore wind power. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the floating device used in the rapid reconnection method of the three-column floating wind power mooring system of the present invention.

[0035] Figure 2 This is a schematic diagram of the anchor chain lifting device used in the rapid reconnection method of the three-column floating wind power mooring system of the present invention;

[0036] Figure 3 This is a plan view of step S31 of the present invention;

[0037] Figure 4 This is a plan view of step S32 of the present invention;

[0038] Figure 5 This is a plan view of step S43 of the present invention;

[0039] Figure 6 This is a plan view of step S44 of the present invention;

[0040] Figure 7 This is a plan view of step S51 of the present invention.

[0041] Figure 8 This is a plan view of step S52 of the present invention. Detailed Implementation

[0042] The technical solutions in the embodiments of the present invention will now be clearly and completely described in conjunction with the accompanying drawings.

[0043] Please see Figures 1 to 8 The rapid reconnection method of the three-column floating wind power mooring system of the present invention is used to connect three sets of underwater mooring cables laid on the seabed to the three columns of the three-column foundation platform 10 of the floating wind power in a one-to-one correspondence; the rapid reconnection method of the present invention uses one crane vessel 100, one DP crane vessel 200, three DP three-purpose vessels, three floating body devices and two anchor chain lifting devices.

[0044] The buoyancy device includes a float 40, two steel wire ropes 41, and two weight blocks 42 (see...). Figure 1 );in,

[0045] A float lifting lug 401 is fixed to the center of the top surface of the float 40; a connecting lug 402 is symmetrically fixed to both sides of the float 40; a set of mooring lugs 403 are fixed at intervals on the bottom surface of the float 40; the float 40 is also clearly marked for easy identification and management.

[0046] The upper ends of the two steel wire ropes 41 are fixed to the two connecting lugs 402 of the float 40 in a corresponding manner;

[0047] Two weight blocks 42 are connected one-to-one to the lower ends of two steel wire ropes 41 and rest on the seabed, which can ensure the stability and reliability of the entire mooring system.

[0048] The anchor chain spreader includes a spreader plate 50, a crane lug 51 connected to the center of the top surface of the spreader plate 50, and a set of anchor chain lugs 52 fixed to the front surface of the spreader plate 50 (see...). Figure 2 ).

[0049] The rapid reconnection method for the mooring system of the present invention includes the following steps: laying of mooring cables in the water, entry of the foundation platform, reconnection of the No. 1 post mooring cable, reconnection of the No. 2 and No. 3 post mooring cables, and mooring cable tensioning.

[0050] The process of laying mooring cables in water includes the following steps:

[0051] S11, first connect the lower ends of the first set of underwater mooring cables 61, the second set of underwater mooring cables 62, and the third set of underwater mooring cables 63 to the first set of suction anchors, the second set of suction anchors, and the third set of suction anchors, respectively, one by one, and then lay the first set of underwater mooring cables 61, the second set of underwater mooring cables 62, and the third set of underwater mooring cables 63 radially on the seabed;

[0052] S12. Connect the upper ends of the first set of underwater mooring cables 61, the second set of underwater mooring cables 62, and the third set of underwater mooring cables 63 to the mooring lugs 403 on the first, second, and third floating devices, respectively. Then, install slings on the float lugs 401 of the first, second, and third floating devices, and then install the crane. Hooked with slings, the first floating device 4-1, the second floating device 4-2, and the third floating device 4-3 are finally lowered into the water by a crane until the two weight blocks 42 on each floating device are symmetrically placed on the seabed below the corresponding floating body 40 on both sides, and a set of mooring lugs 403 on each floating device are pressed below the water surface, so that the upper ends of the first set of underwater mooring cables 61, the second set of underwater mooring cables 62, and the third set of underwater mooring cables 63 are all below the water surface.

[0053] The basic platform onboarding process includes the following steps:

[0054] S21. The three-column foundation platform 10 is towed to the site. A set of universal joints 1A is installed side by side on the top of the outer end face of the first column 11 of the three-column foundation platform 10. The top of the outer end face of the second column 12 and the top of the outer end face of the third column 13 of the three-column foundation platform 10 are respectively equipped with the first set of chain stoppers 2B and the second set of chain stoppers 3B. The first set of guide sprockets 2C is installed on the outer end face of the second column 12 below the first set of chain stoppers 2B. The second set of guide sprockets 3C is installed on the outer end face of the third column 13 below the second set of chain stoppers 3B.

[0055] S22. First, connect the upper end of the first set of upper anchor chains 611 to a set of universal joints 1A, and then coil the first set of upper anchor chains 611 on the top surface of column 11.

[0056] S23. Connect the upper end of the second set of upper anchor chain 621 to the lower end of the first set of connecting wire rope 620. Connect the upper end of the first set of connecting wire rope 620 to a set of anchor chain lugs 52 on the first anchor chain lifting device 5-1. Pass the lower end of the second set of upper anchor chain 62-1 downwards through the first set of chain stoppers 2B and the first set of sprockets 2C one by one until the first set of connecting wire rope 620 also passes through the first set of chain stoppers 2B, so that the first anchor chain lifting device 5-1 remains on the top surface of the second column 12. Then coil the second set of upper anchor chain 621 and the first set of connecting wire rope 620 together on the top surface of the second column 12. The first set of connecting wire rope 620 can leave enough slack for connecting the lower end of the second set of upper anchor chain 621 to the upper end of the second set of underwater mooring cables 62.

[0057] S24. Connect the upper end of the third set of upper anchor chain 631 to the lower end of the second set of connecting wire rope 630. Connect the upper end of the second set of connecting wire rope 630 to a set of anchor chain lugs 52 on the second anchor chain lifting device 5-2. Pass the lower end of the third set of upper anchor chain 631 downwards through the second set of chain stoppers 3B and the second set of guide sprockets 3C one by one until the second set of connecting wire rope 630 also passes through the second set of chain stoppers 3B, so that the second anchor chain lifting device 5-2 remains on the top surface of the third column 13. Then coil the third set of upper anchor chain 631 and the second set of connecting wire rope 630 together on the top surface of the third column 13. The second set of connecting wire rope 630 can leave enough slack for connecting the lower end of the third set of upper anchor chain 631 to the upper end of the third set of underwater mooring cable 63.

[0058] The procedure for reconnecting the mooring cable to bollard number one includes the following steps:

[0059] S31, the crane vessel 100, and the first DP three-way vessel 301 were positioned near the first floating device 4-1. Divers went underwater to retrieve the first floating device 4-1, which was connected to the upper end of the first set of underwater mooring cables 61. The divers first disconnected the float 40 of the first floating device 4-1 from the two weight blocks 42. Then, they hooked the float lugs 401 on the top surface of the float 40 of the first floating device 4-1. Finally, the crane on the crane vessel 100 lifted the float 40 of the first floating device 4-1 onto the deck of the first DP three-way vessel 301 and temporarily secured it (see...). Figure 3 );

[0060] S32. The first DP three-purpose vessel 301 first pulls the upper end of the first set of underwater mooring cables 61 to the vicinity of the first column 11. The crane vessel 100 anchors and positions itself with its stern close to the first column 11 and its midship close to the second column 12. The stern of the crane vessel 100 is positioned with respect to the first column 11, and the midship of the crane vessel 100 is positioned with respect to the second column 12, both by cables 101. The stern of the crane vessel 100 is positioned with respect to the first column 11. Anti-collision buoys 102 are installed between the columns 11 and between the midship side of the crane vessel 100 and the second column 12; then, the lower end of the first set of upper anchor chains 611 located on the first column 11 is hoisted onto the first DP three-way vessel 301 by the crane on the crane vessel 100; then, the workers on the first DP three-way vessel 301 connect the lower end of the first set of upper anchor chains 611 to the upper end of the first set of underwater mooring cables 61 (see...). Figure 4 After completing the connection of the mooring cable of the No. 1 column, the float 40 of the first float device 4-1 on the first DP three-purpose vessel 301 was removed, and the first DP three-purpose vessel 301 was withdrawn.

[0061] The reconnection process for mooring cables No. 2 and No. 3 includes the following steps:

[0062] S41, the crane vessel 100 is anchored and moved back to the midships near column 11 and the bow near column 2. The midships of the crane vessel 100 and column 11, as well as the bow of the crane vessel 100 and column 2, are positioned by cables 101. Anti-collision buoys 102 are installed between the midships of the crane vessel 100 and column 11, and between the bow of the crane vessel 100 and column 2. The DP crane vessel 200 enters the site and moves to the stern between column 2 and column 13. The second DP three-purpose vessel 302 and the third DP three-purpose vessel 303 are positioned near the second floating device 4-2 and the third floating device 403, respectively.

[0063] S42. Divers dive to retrieve the second floating device 4-2 and the third floating device 4-3, and disconnect the float 40 of the second floating device 4-2 from the two weight blocks 42 and the float 40 of the third floating device 4-3 from the two weight blocks 42. Then, hook the float lifting lug 401 on the top surface of the float 40 of the second floating device 4-2 and hook the float lifting lug 401 on the top surface of the float 40 of the third floating device 4-3. Use the crane of the DP crane vessel 200 to lift the float 40 of the second floating device 4-2 onto the deck of the second DP three-purpose vessel 302 and temporarily fix it. Use the crane of the DP crane vessel 200 to lift the float 40 of the third floating device 4-3 onto the deck of the third DP three-purpose vessel 303 and temporarily fix it.

[0064] S43. The second DP three-purpose vessel 302 first tows the upper end of the second set of underwater mooring cables 62 to the vicinity of the second anchor post 12. Then, the crane of the DP crane vessel 200 hoists the lower end of the second set of upper anchor chains 62-1 located on the second anchor post 12 onto the second DP three-purpose vessel 302. Then, the workers on the second DP three-purpose vessel 302 connect the lower end of the second set of upper anchor chains 621 to the upper end of the second set of underwater mooring cables 62 (see...). Figure 5 Finally, the float 40 of the second float device 4-2 on the second DP three-purpose vessel 302 was removed, and the second DP three-purpose vessel 302 was withdrawn.

[0065] S44. The third DP three-purpose vessel 303 first tows the upper end of the third set of underwater mooring cables 63 to the vicinity of the third column 13. Then, the crane of the DP crane vessel 200 hoists the lower end of the third set of upper anchor chains 63-1 located on the third column 13 onto the third DP three-purpose vessel 303. Then, the workers on the third DP three-purpose vessel 303 connect the lower end of the third set of upper anchor chains 63-1 to the upper end of the third set of underwater mooring cables 63 (see...). Figure 6 Finally, the float 40 of the third floating device 4-3 on the third DP three-purpose vessel 303 was removed, and the third DP three-purpose vessel 303 was withdrawn.

[0066] The mooring cable tensioning process includes the following steps:

[0067] S51. First, the workers hook the crane lug 51 on the first anchor chain spreader 5-1 located on the top surface of the second column 12 to the crane of the DP crane vessel 200; then, the crane of the DP crane vessel 200 pulls the first set of connecting wire ropes 620 upwards until the upper end of the second set of upper anchor chain 621 is pulled to the position of the first set of chain stoppers 2B. The workers then fix the upper end of the second set of upper anchor chain 621 to the first set of chain stoppers 2B. The tensioning of one set of mooring cables for the second column is completed (see...). Figure 7 ), disconnect the first set of connecting wire ropes 620 from the second set of upper anchor chains 621, and detach the first anchor chain lifting device 5-1 from the crane of the DP crane vessel 200;

[0068] S52. First, the workers hook the crane lug 51 on the second anchor chain spreader 5-2 located on the top surface of the third column 13 to the crane of the DP crane vessel 200; then, the crane of the DP crane vessel 200 pulls the second set of connecting wire ropes 630 upwards until the upper end of the third set of upper anchor chain 631 is pulled to the position of the second set of chain stoppers 3B. The workers then fix the upper end of the third set of upper anchor chain 631 to the second set of chain stoppers 3B. The tensioning of one set of mooring cables for the third column is completed (see...). Figure 8 Release the connection between the second set of connecting wire ropes 630 and the upper section of the third set of anchor chains 631, and detach the second anchor chain lifting device 5-2 from the crane of the DP crane vessel 200; construction is complete.

[0069] The rapid reconnection method of the three-column floating wind power mooring system of the present invention connects the first column of the three-column foundation platform to the mooring cable through a universal joint, and connects the second and third columns to the mooring cable through chain stoppers, thereby fixing the platform to the seabed. This not only limits the horizontal displacement range of the platform and allows the platform to move slightly with the wind and waves, but also enables the platform to achieve dynamic stability.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rapid reactivation method for a three-pillar floating wind turbine mooring system, comprising one crane vessel, one DP crane vessel, three DP multi-purpose vessels, three floating body devices, and two anchor chain spreaders; characterized in that, The floating device includes a float, two steel wire ropes, and two weight blocks; a float lifting lug is fixed to the center of the top surface of the float; a connecting lug is symmetrically fixed to both sides of the float; a set of mooring lugs is fixed at intervals on the bottom surface of the float; the upper ends of the two steel wire ropes are fixed to the two connecting lugs of the float in a corresponding manner; the two weight blocks are connected to the lower ends of the two steel wire ropes in a corresponding manner and rest on the seabed. The anchor chain lifting device includes a lifting plate, a crane lug connected to the middle of the top surface of the lifting plate, and a set of anchor chain lugs fixed to the front surface of the lifting plate; The quick reconnection method for the mooring cable includes the following steps: The process includes laying mooring cables in the water, bringing in the foundation platform, reconnecting the mooring cable for column 1, reconnecting the mooring cables for columns 2 and 3, and tensioning the mooring cables. The process of laying mooring cables in water includes the following steps: S11, first connect the lower ends of the first to third sets of underwater mooring cables to the first to third sets of suction anchors one by one, and then lay the first to third sets of underwater mooring cables radially on the seabed. S12. Connect the upper ends of the first to third sets of underwater mooring cables to a set of mooring lugs on the first to third floating bodies, then install slings on the floating lugs of the first to third floating bodies, hook the crane to the slings, and finally lower the first to third floating bodies into the water using the crane until the two weight blocks on each floating body are symmetrically placed on the seabed below the corresponding sides of the floating body, and the set of mooring lugs on each floating body are pressed below the water surface, so that the upper ends of the first to third sets of underwater mooring cables are all below the water surface. The basic platform onboarding process includes the following steps: S21. The three-column foundation platform is towed to the site location. A set of universal joints is installed side by side on the top of the outer end face of the first column of the three-column foundation platform. The first set of chain stoppers and the second set of chain stoppers are installed on the top of the outer end face of the second column and the top of the outer end face of the third column of the three-column foundation platform, respectively. S22. First, connect the upper end of the first set of upper anchor chains to a set of universal joints, and then coil the first set of upper anchor chains on the top surface of column No.

1. S23. Connect the upper end of the second set of upper anchor chains to a set of anchor chain lifting lugs on the first anchor chain lifting device through the first set of connecting wire ropes. Pass the lower end of the second set of upper anchor chains downwards through the first set of chain stoppers one by one until the first set of connecting wire ropes also passes through the first set of chain stoppers, so that the first anchor chain lifting device remains on the top surface of the second column. Then coil the second set of upper anchor chains and the first set of connecting wire ropes together on the top surface of the second column. S24. Connect the upper end of the third set of upper anchor chains to a set of anchor chain lifting lugs on the second anchor chain lifting device through the second set of connecting wire ropes. Pass the lower end of the third set of upper anchor chains downwards through the second set of chain stoppers one by one until the second set of connecting wire ropes also passes through the second set of chain stoppers, so that the second anchor chain lifting device remains on the top surface of column No.

3. Then coil the third set of upper anchor chains and the second set of connecting wire ropes together on the top surface of column No.

3. The procedure for reconnecting the mooring cable to bollard number one includes the following steps: S31. The crane ship and the first DP three-purpose vessel are positioned near the first floating device. Divers go underwater to retrieve the first floating device connected to the upper end of the first set of underwater mooring cables. The divers first disconnect the float of the first floating device from the two weight blocks, then hook the float lifting lug on the top surface of the float of the first floating device, and then use the crane on the crane ship to lift the float of the first floating device onto the deck of the first DP three-purpose vessel and temporarily fix it. S32. The first DP three-purpose vessel first pulls the upper end of the first set of underwater mooring cables to the vicinity of the No. 1 column. The crane vessel anchors and positions itself with its stern close to the No. 1 column and its midships close to the No. 2 column. Then, the crane on the crane vessel uses its crane to lift the lower end of the first set of upper anchor chains located on the No. 1 column to the first DP three-purpose vessel and connect it to the upper end of the first set of underwater mooring cables. Then, the float of the first floating device on the first DP three-purpose vessel is removed, and the first DP three-purpose vessel withdraws. The reconnection process for mooring cables No. 2 and No. 3 includes the following steps: S41, the crane vessel anchors and retreats to the midships near column 1 and the bow near column 2; the DP crane vessel enters the site and moves to the stern between column 2 and column 3; the second DP 3-in-1 vessel and the third DP 3-in-1 vessel are positioned near the second and third floating devices respectively. S42. Divers descend to salvage the second and third floating devices, disconnecting the float of the second floating device from the two weight blocks and the float of the third floating device from the two weight blocks. Then, they hook up the lifting lugs on the top surface of the float of the second floating device and the lifting lugs on the top surface of the float of the third floating device. The float of the second floating device is lifted onto the deck of the second DP three-purpose vessel and temporarily secured using the crane of the DP crane vessel. The float of the third floating device is lifted onto the deck of the third DP three-purpose vessel and temporarily secured using the crane of the DP crane vessel. S43. The second DP three-purpose vessel first tows the upper end of the second set of underwater mooring cables to the second column. Then, the crane of the DP crane vessel connects the lower end of the second set of upper anchor chains on the second column to the upper end of the second set of underwater mooring cables on the second DP three-purpose vessel. Finally, the float of the second floating device on the second DP three-purpose vessel is removed, and the second DP three-purpose vessel withdraws. S44. The third DP three-purpose vessel first tows the upper end of the third set of underwater mooring cables to the third column. Then, the crane of the DP crane vessel connects the lower end of the third set of upper anchor chains on the third column to the upper end of the third set of underwater mooring cables on the third DP three-purpose vessel. Finally, the float of the third floating device on the third DP three-purpose vessel is removed, and the third DP three-purpose vessel withdraws. The mooring cable tensioning process includes the following steps: S51. First, the workers hook the crane lug on the first anchor chain spreader located on the top surface of the second column to the crane of the DP crane vessel. Then, the crane of the DP crane vessel pulls the first set of connecting wire ropes until the upper end of the second set of upper anchor chains is pulled to the position of the first set of chain stoppers. The workers then fix the upper end of the second set of upper anchor chains to the first set of chain stoppers. The mooring cable of the second column is tensioned. The connection between the first set of connecting wire ropes and the second set of upper anchor chains is released, and the first anchor chain spreader is unhooked from the crane of the DP crane vessel. S52. First, the workers hook the crane lug on the second anchor chain spreader located on the top surface of the third column to the crane of the DP crane vessel. Then, the crane of the DP crane vessel pulls the second set of connecting wire ropes until the upper end of the third set of upper anchor chains is pulled to the position of the second set of chain stoppers. The workers then fix the upper end of the third set of upper anchor chains to the second set of chain stoppers. The mooring cable tensioning of the third column is completed. The connection between the second set of connecting wire ropes and the third set of upper anchor chains is released, and the second anchor chain spreader is unhooked from the crane of the DP crane vessel. The construction is then completed.

2. The rapid reconnection method for a three-post floating wind turbine mooring system according to claim 1, characterized in that, In step S32 of the process of reconnecting the mooring cable of the No. 1 column, the stern of the crane vessel is positioned with the No. 1 column and the midship of the crane vessel is positioned with the No. 2 column. Anti-collision buoys are installed between the stern of the crane vessel and the No. 1 column and between the midship of the crane vessel and the No. 2 column.

3. The rapid reconnection method for a three-post floating wind turbine mooring system according to claim 1, characterized in that, In step S41 of the process of reconnecting the mooring cables of the No. 2 and No. 3 pillars, the crane vessel is positioned between the midship and the No. 1 pillar, and between the bow and the No. 2 pillar, by means of cables. Anti-collision buoys are installed between the midship side of the crane vessel and the No. 1 pillar, and between the bow side of the crane vessel and the No. 2 pillar.

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