A method for hoisting a large-scale rotary platform

Abstract

The application discloses a hoisting method of a large-scale rotary platform, and comprises the following steps: S1, selecting a first floating crane ship and a second floating crane ship with different hoisting performance advantages, and planning a cooperative ship moving path of the two ships in the whole hoisting process; S2, forming a relative position suitable for hoisting connection of the two floating crane ships, a transport ship and a rotary platform to be hoisted, and connecting hooks of the two floating crane ships with the rotary platform to be hoisted; S3, synchronously hoisting the rotary platform to be hoisted by the two floating crane ships to make the rotary platform to be hoisted separate from the transport ship, then, according to the cooperative ship moving path planned in the step S1, the two ships cooperatively perform horizontal moving and / or longitudinal moving operations, and the rotary platform to be hoisted is collectively transported to above the installation position; and S4, the two floating crane ships cooperatively operate to lower and accurately install the rotary platform to be hoisted in place. The hoisting method solves the problems of high cost and navigation height limitation of the existing large-scale rotary platform hoisting mode.

Description

Technical Field

[0001] This invention relates to the field of ship hoisting technology, and in particular to a hoisting method for a large rotating platform. Background Technology

[0002] During the construction of the 2200-ton multi-functional crane vessel, large crane equipment needs to be installed at the stern. After the main hull is completed, a floating crane vessel is required to sequentially lift the crane's slewing platform, boom, and A-frame. The slewing platform, serving as the foundation for the boom and A-frame installation, is a crucial step in the entire project; its efficiency and safety directly determine the project's progress and quality. However, the slewing platform has significant self-weight characteristics, and multiple factors, including lifting height, installation angle, and the height limitations of the 2200-ton multi-functional crane vessel's tower structure, make it difficult for existing floating crane equipment to simultaneously meet the requirements of high load capacity and sufficient lifting height. In practical applications, a single floating crane vessel often has insufficient lifting capacity or is constrained in lifting height, making it unable to independently complete the lifting tasks of such large components. If a single large floating crane vessel is considered as an alternative, it faces the severe challenge of navigation height restrictions; for example, the insufficient clearance in waterways such as the Yamen Bridge prevents large floating crane vessels from entering the operating area. Furthermore, towing vessels to distant docks with unrestricted navigation height for hoisting not only complicates procedures and prolongs project timelines, but also introduces additional transportation costs, safety risks, and environmental uncertainties, significantly reducing overall economic efficiency. Therefore, existing technologies lack a hoisting method that effectively coordinates lifting capacity and lifting height requirements, making it difficult to safely and efficiently perform hoisting operations on slewing platforms in complex water environments. To address these issues, existing technologies urgently need improvement. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention provides a method for hoisting a large slewing platform, thereby solving the problems of high cost and airspace restrictions in existing large slewing platform hoisting methods.

[0004] This invention is achieved using the following technical solution: A method for hoisting a large rotary platform includes the following steps: S1. Based on the size and weight of the rotating platform to be lifted and the water environment of the lifting area, select the first floating crane and the second floating crane with different lifting performance advantages, and plan the collaborative ship movement path of the two ships throughout the lifting process. S2. Anchor the first and second floating crane vessels according to the predetermined plan. Then, position the two floating crane vessels, the transport vessel, and the slewing platform to be lifted in a relative position suitable for lifting and connection. Connect the hooks of the two floating crane vessels to the slewing platform to be lifted. S3. The two floating crane vessels simultaneously lift the slewing platform to be lifted, detaching it from the transport vessel. Subsequently, the two vessels, according to the coordinated vessel-moving path planned in step S1, perform coordinated lateral and / or longitudinal movements to jointly transport the slewing platform to be lifted to the installation position. During this process, the lifting height advantage of the first floating crane vessel and the lifting capacity advantage of the second floating crane vessel are utilized, and the coordinated vessel-moving path is precisely controlled to maintain the force balance between the two vessels and the stability of the slewing platform to be lifted. S4. The two floating crane vessels work together to lower the rotating platform to be hoisted and precisely install it in place.

[0005] Furthermore, step S1 also includes a lug arrangement step: Based on the center of gravity calculation of the slewing platform to be lifted, lifting lugs for connecting the hooks of the two floating cranes are arranged on it so that the load borne by the first and second floating cranes during lifting remains balanced within their respective lifting capacity ranges.

[0006] Furthermore, the arrangement of the lifting lugs includes a front lifting lug group located at the front of the slewing platform to be lifted and a rear lifting lug group located at the rear of the slewing platform to be lifted. The hook of the first floating crane is connected to the front lifting lug group, and the hook of the second floating crane is connected to the rear lifting lug group.

[0007] Furthermore, in the hook connection in step S2: the hooks of each floating crane are connected to the corresponding lifting lugs through a common hook device; The common hook device has a main connecting part at the upper end for connecting the hooks of each floating crane, and at the lower end it has at least two forked slings for connecting the same lifting lug or the same lifting lug group on the slewing platform to be lifted.

[0008] Furthermore, the suspension center lines of the two forked slings coincide with the force center line of the main connection.

[0009] Further, in step S2, the relative positions of the two floating cranes, the transport ship, and the slewing platform to be lifted are arranged to be suitable for lifting and connection as follows: the slewing platform to be lifted is placed on one corner of the transport ship, and the first floating crane and the second floating crane are arranged diagonally relative to the transport ship.

[0010] Furthermore, the first floating crane is positioned and moored on the side of the transport vessel, and the second floating crane is positioned and moored at the stern of the transport vessel.

[0011] Furthermore, the collaborative ship transfer path planning in step S3 is as follows: during the transfer process, the first floating crane vessel is controlled to mainly perform lateral movement, while the second floating crane vessel is controlled to mainly perform longitudinal movement, and the two vessels move in coordination.

[0012] Furthermore, in step S4, the first and second floating crane vessels are controlled to smoothly move the rotating platform to be lifted to directly above the base to be installed along the cooperative vessel moving path. Then, the two floating crane vessels work together to slowly lower the rotating platform to be lifted, so that it approaches and finally sits on the base to be installed.

[0013] Furthermore, after the rotating platform to be hoisted is placed on the mounting base, a positioning check step is also included: checking the alignment of the positioning components at the bottom of the rotating platform to be hoisted with the corresponding structures on the mounting base; after confirming that the alignment is accurate, the final fixing and installation operation is performed.

[0014] Compared with the prior art, the beneficial effects of the present invention include at least the following: The lifting method of this invention successfully achieves the lifting operation of a slewing platform by utilizing a first floating crane vessel with superior lifting height and a second floating crane vessel with superior lifting capacity. Through the design of the positions of the two floating crane vessels and the planned collaborative movement path, the lateral and longitudinal movement paths of the two floating crane vessels at different positions are precisely planned, ensuring the coordinated stability and uniform force distribution of the two floating crane vessels throughout the entire lifting operation. This ensures the stability and safety of the large slewing platform during lifting and transportation. This collaborative operation mode avoids the limitations of a single floating crane in terms of lifting capacity and lifting height, enabling the efficient completion of large component lifting tasks even in waters with restricted navigation height. Compared to the solutions mentioned in the background art, such as leasing large floating cranes or towing to unrestricted wharves for lifting, the lifting method of this invention significantly reduces lifting costs and time while ensuring operational safety and efficiency, effectively solving the technical problem caused by the inability of a single floating crane vessel to simultaneously achieve both lifting capacity and lifting height due to navigation height restrictions. Attached Figure Description

[0015] Figure 1 This is a diagram showing the anchoring and positioning arrangement of two floating crane vessels according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the lifting of the rotating platform to be hoisted according to an embodiment of the present invention; Figure 3 This is one of the schematic diagrams of two floating crane vessels moving according to a cooperative vessel-moving path in an embodiment of the present invention; Figure 4 This is the second schematic diagram of two floating crane vessels moving according to a cooperative vessel-moving path in an embodiment of the present invention; Figure 5 This is the third schematic diagram of two floating crane vessels moving according to a cooperative vessel-moving path in an embodiment of the present invention; Figure 6 This is the fourth schematic diagram of two floating crane vessels moving according to a cooperative vessel-moving path in an embodiment of the present invention; Figure 7This is a schematic diagram of two floating crane vessels performing lifting operations on the rotating platform to be lifted, according to an embodiment of the present invention. Figure 8 This is a schematic diagram of the first and second hooks being connected to the rotating platform to be lifted according to an embodiment of the present invention. Figure 9 This is a schematic diagram of the first hook of this embodiment of the invention being connected to the lifting lug of the rotating platform to be lifted via a common hook device; Figure 10 This is a schematic diagram illustrating the connection between the common hook device and the lifting lug of the rotating platform to be lifted, according to an embodiment of the present invention. In the diagram: 1. First floating crane vessel; 11. First hook; 2. Second floating crane vessel; 21. Second hook; 3. Transport vessel; 4. Crane vessel; 5. Turning platform to be lifted; 6. Common hook device; 61. Main connection; 62. Forked sling; 7. Mooring cable; Detailed Implementation Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided to make the invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0016] The terms used to express position and direction in this invention are illustrated with reference to the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this invention.

[0017] like Figures 1 to 10 As shown, the present invention provides a method for hoisting a large rotary platform, comprising the following steps: S1. Based on the size and weight of the rotating platform 5 to be lifted and the water environment for lifting, select the first floating crane vessel 1 and the second floating crane vessel 2 with different lifting performance advantages, and plan the collaborative vessel moving path of the two vessels throughout the lifting process. S2. Anchor the first floating crane vessel 1 and the second floating crane vessel 2 according to the predetermined plan. Then, make the two floating crane vessels, the transport vessel 3 and the slewing platform 5 to be lifted into a relative position suitable for lifting connection, and connect the hooks of the two floating crane vessels to the slewing platform 5 to be lifted. S3. The two floating crane vessels simultaneously lift the rotating platform 5 to be lifted, detaching it from the transport vessel 3. Subsequently, the two vessels, according to the coordinated vessel-moving path planned in step S1, perform coordinated lateral and / or longitudinal movements to jointly transport the rotating platform 5 to be lifted to the installation position. During this process, the lifting height advantage of the first floating crane vessel 1 and the lifting capacity advantage of the second floating crane vessel 2 are utilized, and the force on the two vessels is kept balanced and the rotating platform 5 to be lifted is kept stable through precise control of the coordinated vessel-moving path. S4. The two floating crane vessels work together to lower the rotating platform 5 to be hoisted and precisely install it in place.

[0018] In this implementation, in step S1, when selecting a floating crane vessel, a preliminary selection of vessels that meet basic lifting requirements can be made based on the total weight of the slewing platform 5 to be lifted and the required maximum lifting height. For example, matching can be done based on the floating crane vessel's rated lifting capacity and maximum lifting height parameters. Subsequently, environmental factors such as water depth, width, tides, currents, and waves can be further considered to ensure that the selected floating crane vessel can operate safely in that specific water area. When planning the collaborative vessel relocation path, a preliminary approximate relocation route can be determined based on the distance between the installation location and the mooring location of the transport vessel 3, as well as the obstacle situation. The purpose is to safely transport the slewing platform 5 to be lifted from above the transport vessel 3 to above the installation location. In step S2, during anchoring and positioning, the two floating crane vessels can be fixed in designated positions using mooring cables 7 according to the pre-set mooring points to resist displacement caused by water currents and wind forces. This predetermined plan can be a simple diagram including the coordinates and orientation of each vessel. When establishing a suitable relative position for the lifting connection, the distance and angle between the transport vessel 3 and the two floating crane vessels can be adjusted to allow the hooks of the floating crane vessels to easily and safely connect with the connection points on the slewing platform 5 to be lifted. In step S3, utilizing the lifting height advantage of the first floating crane vessel 1 and the lifting capacity advantage of the second floating crane vessel 2, and through precise control of the coordinated vessel movement path, the forces on the two vessels are balanced and the slewing platform 5 to be lifted is kept stable. Specifically, during synchronous lifting, the cranes of the two floating crane vessels can be started simultaneously, lifting the slewing platform 5 to be lifted at the same speed and rhythm, so that it smoothly leaves the deck of the transport vessel 3. This synchronous operation can be manually coordinated via radio communication. During the coordinated vessel movement operation, the two floating crane vessels can move laterally or longitudinally, or simultaneously, through their respective power systems, according to the planned path. For example, movement can be achieved by the crew manually operating the propellers and rudders. During the transfer process, the stress on the two vessels can be assessed based on experience, and the speed and direction of the transfer can be adjusted to avoid severe shaking or tilting of the rotating platform 5 to be lifted. In step S4, during the lowering process, the cranes of the two floating crane vessels can synchronously and slowly lower the rotating platform 5 to be lifted, gradually bringing it closer to the installation position. This lowering speed can be adjusted in real time according to the site conditions. Upon precise installation, the rotating platform 5 can be aligned with the installation base by visual observation or simple measuring tools, and then smoothly placed on the base. For example, the floating crane vessels can be guided to make minor positional adjustments under the instructions of the commanding personnel to achieve final alignment.

[0019] Specifically, for example, it would be necessary to install a large rotating platform weighing 2,000 tons and with a diameter of 30 meters onto a newly built 2,200-ton multi-functional crane vessel 4. The crane vessel 4 has a relatively high tower, and the installation location has certain height requirements above the water surface. At the same time, there are navigation height restrictions in the waters where it is located, making it impossible to use ultra-large floating crane vessels.

[0020] First, in step S1, based on the size of the large rotating platform, its weight of 2000 tons, and the navigation height restrictions and water depth conditions of location A, two floating crane vessels are selected. For example, the first floating crane vessel 1 is selected, characterized by a high lifting height but a relatively small lifting capacity, for example, a maximum lifting capacity of 1200 tons; the second floating crane vessel 2 is selected, characterized by a strong lifting capacity but a relatively low lifting height, for example, a maximum lifting capacity of 1500 tons. In this way, the performance advantages of the two floating crane vessels are complemented. Subsequently, a collaborative vessel relocation path is planned according to the berthing position of the transport vessel 3 and the precise coordinates of the installation base. This path is designed to avoid underwater obstacles and waterways, and to ensure that the two floating crane vessels maintain a safe distance throughout the relocation process, while smoothly transporting the rotating platform directly above the installation position.

[0021] Next, in step S2, the first floating crane vessel 1 and the second floating crane vessel 2 are precisely anchored and positioned on either side of the transport vessel 3 according to a predetermined plan, for example, using a GPS positioning system and anchoring equipment, forming a relative position suitable for lifting and connection. For example, the first floating crane vessel 1 is positioned on the port side of the transport vessel 3, and the second floating crane vessel 2 is positioned on the starboard side of the transport vessel 3, so that the booms of both vessels can simultaneously cover the lifting points on the slewing platform. Subsequently, the hooks of the two floating crane vessels are safely connected to multiple lifting lugs on the slewing platform 5 to be lifted via pre-set connecting rigging.

[0022] Then, in step S3, under the unified command of the command center, the cranes of the two floating crane vessels start synchronously, lifting the rotating platform 5 to be lifted smoothly from the deck of the transport vessel 3 at a preset lifting speed, so that it is completely detached from the transport vessel 3. During this process, due to the lifting height advantage of the first floating crane vessel 1, its boom is adjusted to a higher angle to meet the lifting height required by the rotating platform; at the same time, the second floating crane vessel 2 utilizes its lifting capacity advantage to bear most of the weight of the rotating platform. According to the coordinated ship-moving path planned in step S1, the two vessels perform coordinated lateral and / or longitudinal movements through their respective propulsion systems. For example, the first floating crane vessel 1 is mainly responsible for lateral movement, while the second floating crane vessel 2 is mainly responsible for longitudinal movement. The two coordinate with each other to smoothly transport the large rotating platform directly above the installation position. Through real-time monitoring and precise control of the ship-moving speed, direction, and hook force, it is ensured that the two vessels are subjected to balanced forces during the movement, and the rotating platform 5 to be lifted remains stable at all times, avoiding safety risks caused by swaying or tilting.

[0023] Finally, in step S4, after the slewing platform 5 to be hoisted is precisely transported to directly above the installation position, the two floating cranes work together to slowly and smoothly lower the slewing platform. With the precise guidance of the on-site command personnel and the close cooperation of the operators on both vessels, the slewing platform is precisely aligned with the installation base and finally sits on the base, completing the installation.

[0024] This invention, through the coordinated positioning of two floating crane vessels, fully leverages the technical advantages of each vessel to successfully complete the lifting operation of a slewing platform. This solves the technical problem caused by the inability of a single floating crane to simultaneously handle both lifting capacity and lifting height, saving at least 5 million RMB compared to leasing a large floating crane. Specifically, in step S1, by selecting a first floating crane vessel 1 with a lifting height advantage and a second floating crane vessel 2 with a lifting capacity advantage, and planning a coordinated movement path, efficient integration of existing floating crane resources is achieved. In step S3, the two floating crane vessels simultaneously lift and coordinate the transport, fully utilizing their respective advantages. The first floating crane vessel 1 provides the required lifting height, while the second floating crane vessel 2 bears the main weight, ensuring the stability and safety of the large slewing platform during lifting and transport. This collaborative operation mode avoids the limitations of a single floating crane in terms of lifting capacity and lifting height, enabling efficient completion of large component lifting tasks even in waters with limited navigation height. Compared to the methods mentioned in the background section, such as leasing large floating cranes or towing vessels to unrestricted docks for lifting operations, the method in this embodiment significantly reduces engineering costs and time while ensuring operational safety and efficiency. This method ensures the stability and precision of the entire lifting process through precise collaborative vessel movement path planning and balanced force control between the two vessels.

[0025] As a preferred embodiment, step S1 further includes a lifting lug arrangement step: based on the center of gravity calculation result of the rotating platform 5 to be lifted, lifting lugs for connecting the hooks of the two floating cranes are arranged on it, so that the load borne by the first floating crane 1 and the second floating crane 2 during lifting is kept in equilibrium within their respective lifting capacity ranges.

[0026] In this embodiment, to effectively address the potential issue of uneven stress distribution during the lifting of a large slewing platform, a lifting lug arrangement step is introduced in step S1 of the above-described lifting method. The core of this step lies in first accurately calculating the center of gravity of the large slewing platform, which is the basis for determining its mass distribution and stability. Based on this center of gravity calculation, lifting lugs for connecting the hooks of the first floating crane vessel 1 and the second floating crane vessel 2 are cleverly arranged on the slewing platform structure. This arrangement is not arbitrary but carefully designed to precisely control the load borne by the two floating crane vessels during lifting by adjusting the position of the lifting lugs relative to the center of gravity. Since the first floating crane vessel 1 and the second floating crane vessel 2 may have different lifting performance advantages and lifting capacities, optimizing the arrangement of the lifting lugs ensures that the load borne by each floating crane vessel is within its respective safe lifting capacity range, and that the overall stress is balanced. This balanced load distribution not only avoids the risk of overloading a single vessel, but also significantly improves the stability of the entire lifting system, laying a solid foundation for subsequent synchronous lifting, coordinated vessel movement, and precise installation. This effectively solves the lifting risks and efficiency problems that may be caused by uneven load distribution.

[0027] In a preferred embodiment, the lifting lug arrangement includes a front lifting lug group located at the front of the rotating platform 5 to be lifted and a rear lifting lug group located at the rear of the rotating platform 5 to be lifted. The hook of the first floating crane 1 is connected to the front lifting lug group, and the hook of the second floating crane 2 is connected to the rear lifting lug group.

[0028] In this embodiment, the lifting lugs of the rotating platform 5 to be lifted are clearly divided into a front lug group and a rear lug group. The hooks of the first floating crane vessel 1 are connected to the front lug group, and the hooks of the second floating crane vessel 2 are connected to the rear lug group, thus achieving a structural distribution of the platform's lifting load. This regional, vessel-specific connection strategy allows the two floating crane vessels, each with different lifting performance advantages, to act more precisely on different areas of the platform according to their respective characteristics. For example, the lifting height advantage of the first floating crane vessel 1 can better handle situations where there may be a tall structure at the front of the platform or where a greater lifting height is required, while the lifting capacity advantage of the second floating crane vessel 2 can effectively bear the larger weight that may exist at the rear of the platform. In this way, the lifting load is naturally distributed and borne by the two floating crane vessels, avoiding local overload or imbalance that may be caused by single-point or concentrated force. At the same time, this clear connection provides a clear control basis for subsequent coordinated lifting and ship-moving operations, enabling operators to independently or collaboratively adjust the lifting force of the two ships according to the force conditions at the front and rear, thereby maintaining the stability and force balance of the rotating platform 5 to be lifted throughout the entire lifting process. This effectively solves the problem of how to specifically achieve force balance and platform stability when the lifting lugs are arranged based solely on the center of gravity calculation.

[0029] In a preferred embodiment, in the hook connection in step S2: the first hook 11 of the first floating crane 1 is connected to the corresponding lifting lug of the rotating platform 5 to be lifted through a common hook device 6. The upper end of the common hook device 6 is provided with a main connecting part 61 for connecting the first hook 11 of the first floating crane 1, and the lower end is provided with at least two forked slings 62 for connecting the corresponding lifting lug of the rotating platform 5 to be lifted.

[0030] In this embodiment, since the lifting lugs of the rotating platform 5 to be lifted are arranged laterally along the crane vessel 4, while the first hook 11 of the first floating crane vessel 1 is arranged longitudinally, a common hook device 6 is designed to solve the problem that the direction of the lifting lugs is inconsistent with the direction of the hook of the first floating crane vessel 1.

[0031] Specifically, the main connecting part 61 is the upper part of the common hook device 6, specifically designed to connect with the first hook 11 of the first floating crane vessel 1. Its structure should ensure the safe and reliable bearing of the entire load from the floating crane vessel's hook and its transfer to the lower structure of the common hook device 6. The main connecting part 61 can be a large lifting ring, a main lifting chain link, or a dedicated connector matching the shape of the hook. The forked sling 62 can evenly distribute the load transferred from the main connecting part 61 to each lifting lug, thus preventing excessive stress on any single lug. The forked sling 62 can be made of wire rope, chain, or synthetic fiber, and equipped with appropriate end connectors such as shackles or hooks. When the first hook 11 of the first floating crane vessel 1 needs to be connected to the rotating platform 5 to be lifted, the first hook 11 is first connected to the main connecting part 61 of the common hook device 6. Subsequently, at least two branched slings 62 at the lower end of the common hook device 6 are respectively connected to specific connection points on the same lifting lug or the same lug group on the slewing platform 5 to be lifted. In this way, the overall load from the hook of the first floating crane vessel 1 is received by the main connection part 61 of the common hook device 6 and effectively distributed and transferred to multiple lifting lugs on the slewing platform 5 to be lifted via the branched slings 62. This connection method allows the first hook 11 of the first floating crane vessel 1 to establish a connection with multiple lifting points on the slewing platform 5 to be lifted in a structured and force-balanced manner, thereby ensuring the stability and safety of the lifting connection. This not only optimizes the interface between the hook and the platform, but also provides a solid foundation for the simultaneous lifting of the slewing platform 5 by the two floating crane vessels in the subsequent step S3 and maintaining its stability, effectively avoiding swaying or tilting that may be caused by unstable connection or uneven force, thereby improving the reliability and accuracy of the entire lifting process.

[0032] In a preferred embodiment, the suspension center lines of the two forked slings 62 coincide with the force center line of the main connecting part 61.

[0033] In this embodiment, by aligning the suspension centerlines of the two forked slings 62 with the force centerline of the main connection 61, it is ensured that the load transmitted from the rotating platform 5 to be lifted to the common hook device 6 can act directly and evenly on the main connection 61 along a straight path. When the hook of the first floating crane 1 applies lifting force through the main connection 61, this force will be transmitted downward along the force centerline of the main connection 61. Since the suspension centerlines of the forked slings 62 coincide with this force centerline, the load borne by the slings can be effectively guided to the center of the main connection 61, avoiding additional bending moments or torques caused by force eccentricity. This design makes the internal stress distribution of the common hook device 6 more reasonable when bearing and transmitting loads, reducing local stress concentration, thereby improving the stability and safety of the entire lifting connection system. At the same time, this also allows the rotating platform 5 to be lifted and moved more smoothly during the lifting process, reducing the risk of swaying and tilting, thus effectively solving the problem of lifting instability caused by uneven force.

[0034] It should be noted that since the second hook 21 of the second floating crane vessel 2 is aligned with the lifting lug, the second hook 21 of the second floating crane vessel 2 can be directly connected to the lifting lug corresponding to the rotating platform 5 to be lifted. When the second floating crane vessel 2 and the first floating crane vessel 1 lift the rotating platform 5 to be lifted, it is necessary to ensure that the rotating platform 5 to be lifted is stable.

[0035] In a preferred embodiment, in step S2 above, the relative positions of the two floating cranes, the transport ship 3, and the slewing platform 5 to be lifted are such that the slewing platform 5 to be lifted is placed on one corner of the transport ship 3, and the first floating crane 1 and the second floating crane 2 are arranged diagonally relative to the transport ship 3.

[0036] In this embodiment, by placing the slewing platform 5 to be lifted on one corner of the transport vessel 3, and arranging the first floating crane 1 and the second floating crane 2 diagonally relative to the transport vessel 3, an optimized initial layout is provided for the entire lifting process. This layout allows the two floating cranes to apply lifting forces to the slewing platform 5 placed in the corner from a wider baseline and different angles. This spatially separated force-bearing point configuration can effectively distribute the lifting load and provide a more stable and balanced lifting foundation for the large, heavy, and potentially irregularly oriented slewing platform 5. During the hook connection in step S2, the diagonally arranged floating cranes can better adjust the hook position, avoiding interference with the transport vessel 3 or other equipment, thereby improving the convenience and safety of the connection. In addition, this initial layout also provides favorable conditions for the coordinated lateral and / or longitudinal movement operations in the subsequent step S3, enabling the two vessels to more precisely control the attitude and movement trajectory of the slewing platform 5 while keeping it stable. This specific relative position, combined with the overall collaborative hoisting method, significantly enhances the stability, controllability, and safety of hoisting operations on large rotating platforms.

[0037] In a preferred embodiment, the first floating crane 1 is positioned and moored on the side of the transport vessel 3, and the second floating crane 2 is positioned and moored at the stern of the transport vessel 3.

[0038] In this embodiment, the first floating crane vessel 1 is positioned and moored on the side of the transport vessel 3. This means that the first floating crane vessel 1 is moored in the side area of ​​the transport vessel 3. This positioning method allows the first floating crane vessel 1 to approach the rotating platform 5 to be lifted from the side, facilitating the connection of its hook with the platform and providing sufficient working space for subsequent lifting and moving operations. Specifically, the first floating crane vessel 1 can be moored on the port or starboard side of the transport vessel 3, with its hull approximately parallel to the hull of the transport vessel 3, or moored at a certain angle to optimize the force distribution and operational convenience during lifting operations. For example, the first floating crane vessel 1 can be precisely fixed to the side of the transport vessel 3 by anchoring, using mooring lines 7, or using a dynamic positioning system. The second floating crane vessel 2 is positioned and moored at the stern of the transport vessel 3. This means that the second floating crane vessel 2 is moored in the stern area of ​​the transport vessel 3. The stern generally refers to the rear of the hull. This positioning method allows the second floating crane vessel 2 to approach the rotating platform 5 to be lifted from the rear, forming a collaborative working arrangement with the first floating crane vessel 1 positioned from the side, jointly bearing the weight of the rotating platform 5. Specifically, the second floating crane vessel 2 can be moored directly behind the transport vessel 3, or slightly off to one side of the rear, with its hull axis roughly parallel to that of the transport vessel 3. For example, the second floating crane vessel 2 can be precisely secured to the stern of the transport vessel 3 by anchoring, using mooring lines 7, or employing a dynamic positioning system.

[0039] This embodiment clarifies the diagonal arrangement by positioning the first floating crane 1 on the side of the transport vessel 3 and the second floating crane 2 on the stern of the transport vessel 3. This precise positioning strategy allows the two floating cranes to perform a surround operation on the rotating platform 5, which is placed at one corner of the transport vessel 3, from different directions. The first floating crane 1, with its advantageous position on the side, can fully utilize its lifting height to provide the main vertical lifting force from the side and facilitate subsequent lateral movement. Meanwhile, the second floating crane 2, positioned at the stern, can effectively utilize its lifting capacity to provide stable lifting support from another direction and support subsequent longitudinal movement. This coordinated positioning of the hull and stern not only ensures that the two floating crane vessels form a stable diagonal force-bearing structure during lifting, effectively distributing the weight of the slewing platform 5 to be lifted and avoiding the risk of excessive stress on a single vessel or platform tilting, but also lays the foundation for subsequent coordinated vessel movement (lateral and / or longitudinal movement) operations, making platform attitude control more precise and stable throughout the lifting process. This clear positioning effectively solves the problem of achieving a stable and efficient relative position for lifting connections between the two floating crane vessels and the transport vessel 3 in complex water environments. Furthermore, this clear positioning provides a solid foundation for subsequent coordinated vessel movement path planning and implementation, making the entire lifting process smoother, safer, and more efficient, significantly improving the stability and controllability of large slewing platform lifting operations.

[0040] As a preferred embodiment, the collaborative ship movement path planning in step S3 is as follows: during the transfer process, the first floating crane 1 is controlled to mainly perform lateral movement, while the second floating crane 2 is controlled to mainly perform longitudinal movement, and the two ships move in coordination.

[0041] In this embodiment, controlling the first floating crane vessel 1 to primarily perform lateral movement means that the first floating crane vessel 1 moves on the water surface in a direction perpendicular to its longitudinal axis, and bears the main driving force or control force for the lateral displacement of the slewing platform 5 to be lifted. This is typically achieved by adjusting the propulsion system or mooring system of the first floating crane vessel 1. For example, the first floating crane vessel 1 can utilize its equipped side thrusters or azimuth propellers to generate lateral thrust, causing its hull to move laterally, thereby driving the load being lifted to lateral displacement. Controlling the second floating crane vessel 2 to primarily perform longitudinal movement means that the second floating crane vessel 2 moves on the water surface in a direction parallel to its longitudinal axis, and bears the main driving force or control force for the longitudinal displacement of the slewing platform 5 to be lifted. This is typically achieved by adjusting the propulsion system or mooring system of the second floating crane vessel 2. For example, the second floating crane vessel 2 can utilize the cooperation of its main propeller (such as a propeller) and rudder to generate longitudinal thrust, causing its hull to move longitudinally, thereby driving the load being lifted to longitudinal displacement.

[0042] Specifically, the complex two-dimensional movement (lateral and longitudinal) of the rotating platform 5 to be lifted on the water surface is decomposed into the primary responsibilities of two floating crane vessels: the first floating crane vessel 1 is mainly responsible for lateral movement, and the second floating crane vessel 2 is mainly responsible for longitudinal movement. Given the diagonal arrangement of the first floating crane vessel 1 moored on the side of the transport vessel 3 and the second floating crane vessel 2 moored diagonally at the stern of the transport vessel 3, this arrangement effectively simplifies the control logic for the coordinated movement of the two vessels. The first floating crane vessel 1, positioned on the side, has better lateral maneuverability, while the second floating crane vessel 2, positioned at the stern, has greater longitudinal maneuverability. Through this division of labor, the two floating crane vessels can execute the coordinated movement path more efficiently and accurately, avoiding the control conflicts and instabilities that may occur when two large floating crane vessels simultaneously perform lateral and longitudinal adjustments in complex water environments. This ensures that the rotating platform 5 to be lifted remains stable and evenly stressed during the movement, greatly improving the safety, efficiency, and precision of the lifting operation.

[0043] In a preferred embodiment, in step S4, the first floating crane vessel 1 and the second floating crane vessel 2 are controlled to move the rotating platform 5 to be lifted to a position directly above the base to be installed along the cooperative moving path. Then, the two floating crane vessels work together to slowly lower the rotating platform 5 to be lifted, so that it approaches and finally sits on the base to be installed.

[0044] In this embodiment, the problem of accurately positioning large components in aquatic environments is effectively solved by precisely controlling the final installation step in the large rotating platform hoisting method. In the above hoisting method, firstly, based on the size and weight of the rotating platform 5 to be hoisted and the hoisting aquatic environment, a first floating crane vessel 1 and a second floating crane vessel 2 with different hoisting performance advantages are selected, and a collaborative vessel-moving path is planned for the two vessels throughout the hoisting process. Subsequently, the two floating crane vessels collaboratively lift the rotating platform 5 to be hoisted and transport it above the installation position. Based on this, to ensure that the rotating platform 5 can be accurately and stably installed, this application further proposes that, in step S4, the first floating crane vessel 1 and the second floating crane vessel 2 are controlled to smoothly move the rotating platform 5 to be hoisted directly above the installation base along the collaborative vessel-moving path. This operation ensures that the platform's horizontal position is precisely aligned with the installation base before the final lowering begins, greatly simplifying the difficulty of subsequent vertical lowering and reducing the risk of lateral collisions. Subsequently, the two floating crane vessels worked together to slowly lower the rotating platform 5 to be lifted. This slow lowering speed provided operators with ample time for real-time monitoring and fine-tuning, while effectively suppressing platform swaying caused by environmental factors such as water flow and waves, ensuring the stability of the lowering process. By precisely controlling the lowering speed and the coordinated force of the two vessels, the rotating platform 5 could gradually approach and finally sit on the installation base in a controlled manner, thus avoiding impact contact and ensuring the structural integrity and installation accuracy of the platform and base. This scheme, by breaking down the final installation process into two stages—precise horizontal positioning and controlled vertical lowering—and emphasizing the coordinated and precise operation of the two floating crane vessels, makes the precise and safe installation of large rotating platforms possible in complex aquatic environments.

[0045] In a preferred embodiment, after the rotating platform 5 to be hoisted is placed on the mounting base, a positioning check step is also included: checking the alignment of the positioning component at the bottom of the rotating platform 5 to be hoisted with the corresponding structure on the mounting base; after confirming that the alignment is accurate, the final fixing and installation operation is performed.

[0046] In this embodiment, after the rotary platform 5 to be hoisted is placed on the mounting base, a positioning check step is introduced to strictly verify the alignment of the positioning components at the bottom of the rotary platform with the corresponding structures on the mounting base. This check process, as a key step before final fixed installation, ensures that the positional accuracy of the rotary platform meets the design requirements after it is lowered into place. Only after confirming accurate alignment is the final fixed installation operation allowed. This creates a closed-loop control for the entire hoisting and installation process: initial positioning, precise verification, and finally permanent fixing. This mechanism effectively avoids installation errors caused by initial lowering position deviations, thereby ensuring the connection accuracy and structural stability between the large rotary platform and the mounting base. This significantly reduces structural risks and operational failures caused by improper installation, extends the service life of the equipment, and reduces the cost of later maintenance and rework.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the invention without departing from the principles and spirit of the invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A method for hoisting a large rotary platform, characterized in that, Includes the following steps: S1. Based on the size and weight of the rotating platform to be lifted and the water environment of the lifting area, select the first floating crane and the second floating crane with different lifting performance advantages, and plan the collaborative ship movement path of the two ships throughout the lifting process. S2. Anchor the first and second floating crane vessels according to the predetermined plan. Then, position the two floating crane vessels, the transport vessel, and the slewing platform to be lifted in a relative position suitable for lifting and connection. Connect the hooks of the two floating crane vessels to the slewing platform to be lifted. S3. The two floating crane vessels simultaneously lift the slewing platform to be lifted, detaching it from the transport vessel. Subsequently, the two vessels, according to the coordinated vessel-moving path planned in step S1, perform coordinated lateral and / or longitudinal movements to jointly transport the slewing platform to be lifted to the installation position. During this process, the lifting height advantage of the first floating crane vessel and the lifting capacity advantage of the second floating crane vessel are utilized, and the coordinated vessel-moving path is precisely controlled to maintain the force balance between the two vessels and the stability of the slewing platform to be lifted. S4. The two floating crane vessels work together to lower the rotating platform to be hoisted and precisely install it in place.

2. The hoisting method for a large rotary platform according to claim 1, characterized in that, Step S1 also includes a lifting lug arrangement step: based on the center of gravity calculation result of the slewing platform to be lifted, lifting lugs for connecting the hooks of the two floating cranes are arranged on it so that the load borne by the first floating crane and the second floating crane during lifting is kept in balance within their respective lifting capacity ranges.

3. The hoisting method for a large rotary platform according to claim 2, characterized in that, The lifting lug arrangement includes a front lifting lug group located at the front of the slewing platform to be lifted and a rear lifting lug group located at the rear of the slewing platform to be lifted. The first hook of the first floating crane is connected to the front lifting lug group, and the second hook of the second floating crane is connected to the rear lifting lug group.

4. The method for hoisting a large rotary platform according to any one of claims 1-3, characterized in that, In the hook connection in step S2: the first hook of the first floating crane is connected to the corresponding lifting lug of the rotating platform to be lifted through a common hook device. The upper end of the common hook device is provided with a main connecting part for connecting the first hook of the first floating crane, and the lower end is provided with at least two forked slings for connecting the corresponding lifting lug of the rotating platform to be lifted.

5. The hoisting method for a large rotary platform according to claim 4, characterized in that, The suspension center lines of the two bifurcated slings coincide with the force center line of the main connection.

6. The hoisting method for a large rotary platform according to claim 1, characterized in that, In step S2, the relative positions of the two floating cranes, the transport ship, and the slewing platform to be lifted are arranged to be suitable for lifting and connection: the slewing platform to be lifted is placed on one corner of the transport ship, and the first and second floating cranes are arranged diagonally relative to the transport ship.

7. The hoisting method for a large rotary platform according to claim 6, characterized in that, The first floating crane vessel is positioned and moored on the side of the transport vessel, and the second floating crane vessel is positioned and moored at the stern of the transport vessel.

8. The hoisting method for a large rotary platform according to claim 6 or 7, characterized in that, The collaborative ship transfer path planning in step S3 is as follows: during the transfer process, the first floating crane vessel is controlled to mainly perform lateral movement, while the second floating crane vessel is controlled to mainly perform longitudinal movement, and the two vessels move in coordination.

9. The hoisting method for a large rotary platform according to claim 1, characterized in that, In step S4, the first and second floating crane vessels are controlled to smoothly move the rotating platform to be lifted to the top of the base to be installed along the cooperative vessel moving path. Then, the two floating crane vessels work together to slowly lower the rotating platform to be lifted, so that it approaches and finally sits on the base to be installed.

10. The hoisting method for a large rotary platform according to claim 9, characterized in that, After the slewing platform to be hoisted is placed on the mounting base, a positioning check step is also included: Check the alignment of the positioning components at the bottom of the rotating platform to be hoisted with the corresponding structures on the mounting base; After confirming accurate alignment, perform the final fixing and installation operation.

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