A hoisting method of an ultra-long boom support

Abstract

The application discloses a hoisting method of an ultra-long arm frame, comprising the following steps: S1, establishing a three-dimensional mechanical model of the arm frame, and determining the overall gravity center position and structural strength distribution characteristics of the arm frame; S2, determining the positions and quantities of multiple lifting points on both sides of the strong structural parts at the gravity center position of the arm frame, so as to reduce the deflection deformation of the arm frame under the action of the dead weight; S3, adopting at least two floating cranes for cooperative operation, the total number of lifting hooks provided by the floating cranes is less than the total number of the lifting points, the steel wire ropes are used to connect the lifting points to different lifting hooks, and a composite stress hoisting system is constructed; S4, controlling the floating cranes to synchronously act and lift the arm frame, and independently controlling different hook groups in the composite stress hoisting system to finely adjust the position and posture of the arm frame in a suspended state in multiple degrees of freedom, so as to meet the high-precision pin shaft butt joint installation requirement. The problems, such as uneven stress and pin shaft installation difficulty, caused by the long and flexible structure of the arm frame in the traditional hoisting mode are solved.

Description

Technical Field

[0001] This invention relates to the field of hoisting technology, and in particular to a hoisting method using an ultra-long boom. Background Technology

[0002] In large crane equipment, the boom, as a core component, generally exhibits characteristics such as extremely long structural length, significant overall flexibility, and numerous connection nodes. Due to the typical slender geometry of the boom, its own weight generates a significant flexural deformation effect during lifting operations. This deformation directly causes relative displacement of the pin holes in the connection area at the boom root, making it difficult to achieve precise alignment and smooth insertion of the pins, severely restricting the precision control and operational efficiency of the assembly process. Simultaneously, the boom's self-weight is continuously distributed along its entire length. If the number and location of lifting points are not scientifically planned before lifting, it will cause an imbalance in the structural stress distribution, leading to excessive stress concentration in local sections, and even inducing structural instability or overload risks, posing a significant safety hazard to lifting operations. Existing lifting technologies struggle to effectively coordinate deformation control and attitude adjustment requirements when handling ultra-long booms, especially in high-precision pin docking scenarios, lacking reliable multi-degree-of-freedom fine-tuning capabilities. This results in challenges such as repeated adjustments, extended installation time, and insufficient safety margins during installation. Therefore, existing technologies urgently need improvement to address these issues. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention provides a lifting method for an ultra-long boom, which solves the problems of uneven stress and difficulty in pin installation caused by the long and flexible boom structure in traditional lifting methods.

[0004] This invention is achieved using the following technical solution: A hoisting method for an ultra-long boom includes the following steps: S1. Establish a three-dimensional mechanical model of the boom to determine its overall center of gravity and structural strength distribution characteristics; S2. Based on the center of gravity position, structural strength distribution characteristics and parameters of the lifting equipment, determine the position and number of multiple lifting points in the strong structural parts on both sides of the center of gravity position of the boom to reduce the deflection deformation of the boom under its own weight. S3. At least two crane vessels are used to work together. The total number of hooks provided by the crane vessels is less than the total number of lifting points. Each lifting point is connected to a different hook by steel wire rope to construct a composite force-bearing lifting system. S4. Control each of the crane vessels to move synchronously to lift the boom, and by independently controlling different hook groups in the composite force-bearing lifting system, perform multi-degree-of-freedom position and attitude fine-tuning of the boom in the suspended state to meet the high-precision pin docking installation requirements.

[0005] Furthermore, the number of lifting points is eight, with four lifting points respectively arranged on both sides of the center of gravity of the boom.

[0006] Furthermore, the crane vessel consists of two floating crane vessels, and the total number of hooks is five.

[0007] Furthermore, one of the floating crane vessels A is equipped with a first main hook and a second main hook. The specific method of attaching the rope to floating crane vessel A in step S3 is as follows: A steel wire rope is connected to both sides of the first and second main hooks, and the other end of each steel wire rope is connected to a lifting point, so that both the first and second main hooks are connected to two lifting points.

[0008] Furthermore, another floating crane vessel B is equipped with a third main hook, a fourth main hook, and an auxiliary hook. In step S3, the method of attaching the ropes to floating crane vessel B includes: For the two independent third and fourth main hooks, a single steel wire rope is used, with a lifting point connected in the middle by a shackle, and the two ends of the steel wire rope are hung on the third and fourth main hooks; For the auxiliary hook, a steel wire rope is connected to each side, and the other end of each steel wire rope is connected to a lifting point.

[0009] Furthermore, the specific connection relationship between the eight lifting points and the five hooks is as follows: The first main hook of the floating crane vessel A connects the first lifting point and the third lifting point, and the second main hook connects the second lifting point and the fourth lifting point; The third main hook of the floating crane B is connected to the fifth lifting point, the fourth main hook is connected to the sixth lifting point, and the auxiliary hook is connected to the seventh and eighth lifting points. The first, third, second, and fourth lifting points are located on one side of the boom's center of gravity, while the fifth, sixth, seventh, and eighth lifting points are located on the other side of the boom's center of gravity.

[0010] Furthermore, in step S3: First, two floating crane vessels are arranged side by side to berth the transport vessel, with one floating crane vessel positioned at the bow of the transport vessel and the other at the stern. After the anchor is secured, the hooks of the two floating crane vessels are connected to their respective lifting points.

[0011] Furthermore, in step S2, determining the location of the lifting point at the strong structural part specifically includes setting the lifting point at the truss node, reinforcing rib, or main beam joint of the boom.

[0012] Furthermore, the horizontal distance between each lifting point and the center of gravity is controlled within 1 / 6 to 1 / 2 of the total boom length.

[0013] Furthermore, in step S1, after establishing the three-dimensional mechanical model of the boom, a model verification and correction step is also included: The boom was weighed and its center of gravity was measured on site to obtain actual weight and center of gravity position data. The measured data are compared with the theoretical data calculated by the three-dimensional mechanical model; Based on the verification results, the parameters of the three-dimensional mechanical model are corrected to improve the consistency between the model and the actual hoisting conditions.

[0014] Compared with the prior art, the beneficial effects of the present invention include at least the following: The lifting method of this invention establishes a three-dimensional mechanical model of the boom and accurately determines the center of gravity position and structural strength distribution characteristics based on this model. Through scientific mechanical analysis, the optimal stress area of ​​the boom can be identified, and the position and number of lifting points can be optimized accordingly. This lifting point planning based on precise mechanical analysis ensures the stress balance of the boom in the initial stage of lifting, thereby effectively suppressing the deflection deformation of the boom under its own weight and laying the foundation for subsequent precise installation. In step S3, at least two crane vessels are introduced to work together, and a composite force lifting system with a total number of hooks less than the total number of lifting points is constructed. The combination of two floating crane vessels with eight lifting points and five hooks allows the stress distribution of the entire boom to be adjusted and managed more flexibly, avoiding the risk of local stress concentration and overload. In step S4, multi-degree-of-freedom position and attitude fine-tuning of the boom in the suspended state is realized. Once the boom is lifted, the boom can be precisely adjusted in the X, Y, and Z directions as well as in pitch, roll, and yaw by independently controlling different hook groups in the composite force-bearing lifting system. This multi-degree-of-freedom fine-tuning capability greatly improves the convenience and success rate of pin docking installation for ultra-long booms, effectively solving problems such as uneven force distribution and pin installation difficulties caused by the long and flexible boom structure in traditional lifting methods. Attached Figure Description

[0015] Figure 1 This is a front view of the boom according to an embodiment of the present invention; Figure 2 This is a top view of the boom according to an embodiment of the present invention; Figure 3 This is one of the schematic diagrams of the transfer boom of two floating crane vessels in an embodiment of the present invention; Figure 4 This is the second schematic diagram of the transfer boom of two floating crane vessels in an embodiment of the present invention; Figure 5 This is a schematic diagram of the boom being hoisted onto a crane according to an embodiment of the present invention; In the diagram: 1. Boom; 10. Center of gravity position; 11. First lifting point; 12. Second lifting point; 13. Third lifting point; 14. Fourth lifting point; 15. Fifth lifting point; 16. Sixth lifting point; 17. Seventh lifting point; 18. Eighth lifting point; 2. Floating crane vessel A; 21. First main hook; 22. Second main hook; 3. Floating crane vessel B; 31. Third main hook; 32. Fourth main hook; 33. Auxiliary hook; 4. Transport vessel; 5. Crane. Detailed Implementation

[0016] 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.

[0017] 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.

[0018] like Figures 1 to 5 As shown, the present invention provides a hoisting method for an ultra-long boom 1, comprising the following steps: S1. Establish a three-dimensional mechanical model of the boom 1 to determine its overall center of gravity position 10 and structural strength distribution characteristics; S2. Based on the center of gravity position 10, structural strength distribution characteristics and parameters of the lifting equipment, determine the position and number of multiple lifting points on the strong structural parts on both sides of the center of gravity position 10 of the boom 1 in order to reduce the bending deformation of the boom 1 under its own weight. S3. At least two crane vessels are used to work together. The total number of hooks provided by the crane vessels is less than the total number of lifting points. Each lifting point is connected to a different hook by steel wire rope to construct a composite force-bearing lifting system. S4. Control each of the crane vessels to move synchronously to lift boom 1, and by independently controlling different hook groups in the composite force-bearing lifting system, perform multi-degree-of-freedom position and attitude fine-tuning of boom 1 in the suspended state to meet the high-precision pin docking installation requirements.

[0019] In this embodiment, in step S1, to accurately grasp the weight distribution characteristics of boom 1, it is first modeled. A three-dimensional mechanical model is used to accurately calculate the weight and center-of-gravity coordinates of each segment of boom 1, and then the overall center-of-gravity position 10 of boom 1 is determined through comprehensive calculation. The three-dimensional mechanical model can be established in various ways; for example, it can be based on the geometric dimensions and material properties of boom 1 and modeled using SPD software. After the model is established, software calculations can obtain the center-of-gravity position 10 and stress distribution of boom 1 under different working conditions, thereby identifying areas with high structural strength. These areas will be considered as potential lifting point installation areas.

[0020] Secondly, in step S2, based on the center of gravity position 10 and structural strength distribution characteristics obtained in S1, and combined with the available lifting equipment on site (e.g., the lifting capacity and number of hooks of two large floating cranes), the positions and numbers of multiple lifting points are carefully determined on both sides of the center of gravity position 10 of the boom 1. For example, it can be determined that four lifting points are set on one side of the center of gravity position 10 of the boom 1, and four lifting points are also set on the other side, for a total of eight lifting points. These lifting points are precisely arranged at the strong structural parts identified in S1, such as truss nodes, and their spacing and relative distance from the center of gravity position 10 are optimized to ensure that the self-weight of the boom 1 can be evenly distributed during the lifting process, thereby minimizing the deflection deformation of the boom 1.

[0021] Next, in step S3, at least two crane vessels are used in coordinated operation. For example, two floating crane vessels, A2 and B3, are used. The total number of hooks provided by these two crane vessels is designed to exceed the total number of lifting points on boom 1; for example, a total of five hooks are provided to connect eight lifting points. The eight lifting points on boom 1 are connected to these five different hooks via high-strength steel wire ropes. This multi-point, multi-hook connection method constructs a composite force-bearing lifting system. This system not only provides sufficient lifting capacity, but more importantly, it provides redundancy and flexibility for subsequent fine-tuning, allowing the force on each lifting point or hook group to be managed and adjusted independently.

[0022] Finally, in step S4, at the start of the lifting operation, the floating crane A2 and floating crane B3 are precisely controlled to move synchronously, smoothly lifting boom 1 from transport vessel 4 and placing it in a suspended state. Once boom 1 is suspended, the different hook groups in this composite force-bearing lifting system can be controlled independently. For example, by adjusting the wire rope length of a main hook of floating crane A2, the height of one side of boom 1 can be fine-tuned; by adjusting the wire rope length of the auxiliary hook 33 of floating crane B3, the attitude of the other side of boom 1 can be changed. This independent control capability allows boom 1 to perform multi-degree-of-freedom position and attitude fine-tuning in the X, Y, and Z translational directions and the pitch, roll, and yaw rotational directions. For example, when there is a slight deviation between the pin hole at the base of boom 1 and the pin shaft of the crane body, the operator can precisely adjust the lateral position, vertical height, or rotation angle of boom 1 until the pin hole and pin shaft are perfectly aligned, thereby meeting the high-precision pin shaft docking installation requirements. Through this overall technical solution, boom 1 maintains balanced force during hoisting, effectively controls flexural deformation, and possesses unprecedented fine adjustment capabilities during the installation phase, significantly improving the success rate and safety of installation.

[0023] In existing technologies, the hoisting of ultra-long booms often faces challenges such as large flexural deformation, difficulty in pin alignment, and uneven local stress. Traditional hoisting solutions may rely solely on experience to select a few hoisting points or employ simple two-point hoisting, which makes it difficult to guarantee accuracy and safety when hoisting a 150-meter boom. For example, if only two-point hoisting is used, the boom will experience significant sag deformation under its own weight, causing a significant misalignment between the pin hole and the pin shaft, leading to installation failure.

[0024] This method, through steps S1 and S2, first establishes a detailed three-dimensional mechanical model of boom 1, and based on this model, accurately determines the center of gravity position 10 and the structural strength distribution characteristics. This contrasts with existing technologies that may rely solely on experience or simplified calculations to determine lifting points. Through scientific mechanical analysis, this method can identify the optimal stress-bearing area of ​​boom 1 and optimize the position and number of lifting points accordingly, for example, setting eight lifting points on both sides of the center of gravity. This lifting point planning based on precise mechanical analysis ensures the stress balance of boom 1 in the initial stage of lifting, thereby effectively suppressing the deflection deformation of boom 1 under its own weight, laying the foundation for subsequent precise installation.

[0025] Furthermore, in step S3, this method introduces at least two crane vessels working collaboratively, constructing a composite force-bearing lifting system with a total number of hooks exceeding the total number of lifting points. The combination of two floating crane vessels with eight lifting points and five hooks provides higher redundancy and control potential than traditional single-vehicle or simple multi-vehicle lifting schemes. In existing technologies, even when multiple crane vessels are used, each lifting point may simply be connected to a hook, lacking overall force optimization and fine control capabilities. This method, by connecting multiple lifting points to different hooks, allows for more flexible adjustment and management of the force distribution of the entire boom 1, avoiding the risks of localized stress concentration and overload.

[0026] Most importantly, this method enables multi-degree-of-freedom fine-tuning of the position and attitude of the boom 1 in the suspended state in step S4. After the boom 1 is lifted, by independently controlling different hook groups in the composite force-bearing lifting system, precise adjustments can be made to the boom 1's translation in the X, Y, and Z directions, as well as its pitch, roll, and yaw. This contrasts sharply with existing technologies that may only allow for simple vertical lifting or limited horizontal swing adjustments. For example, during pin-shaft docking, even with millimeter-level deviations between the pin hole and the pin shaft, this method can precisely align the boom 1 by finely adjusting its attitude. This multi-degree-of-freedom fine-tuning capability greatly improves the convenience and success rate of pin-shaft docking installation of the ultra-long boom 1, effectively solves the problems of boom 1 deflection and uneven stress, and achieves significant progress in installation accuracy and flexibility, providing reliable technical support for the engineering application of large ultra-long booms 1.

[0027] In a preferred embodiment, the number of lifting points is eight, with four lifting points arranged on each side of the center of gravity 10 of the boom 1.

[0028] In this embodiment, the lifting points are the interfaces connecting the boom 1 to the lifting equipment, and their number directly affects the force distribution and stability of the boom 1 during the lifting process. Setting the number of lifting points to eight aims to provide sufficient support points to more precisely distribute the self-weight load of the boom 1 and avoid excessive local stress. For example, eight lifting points can form a more stable support network, effectively controlling the deflection and torsion of the boom 1 during the lifting process. Furthermore, eight lifting points also provide sufficient control freedom for the subsequent composite force-bearing lifting system, facilitating multi-point coordinated force distribution. The arrangement of the lifting points is crucial for balancing the force on the boom 1. Distributing the eight lifting points evenly on both sides of the center of gravity 10 of the boom 1, with four on each side, ensures that the boom 1 maintains good balance during the lifting process. This symmetrical or near-symmetrical arrangement helps establish a stable force state in the early stages of lifting and provides balanced torque support for subsequent attitude fine-tuning. For example, this arrangement can effectively counteract the tilting or torsional tendencies that the boom 1 may experience under its own weight, thereby reducing lifting risks and improving operational safety. Meanwhile, the eight lifting points provide the composite force-bearing lifting system with more degrees of freedom for control, enabling more precise and stable control when making multi-degree-of-freedom position and attitude fine-tuning, thereby greatly improving the accuracy and safety of the ultra-long boom pin docking installation.

[0029] The crane vessels consist of two floating crane vessels, and the total number of hooks is five.

[0030] In this embodiment, by specifically defining the lifting vessels as two floating crane vessels and specifying a total of five hooks, the entire lifting system achieves optimized configuration of the lifting equipment while maintaining effective support and control for the eight lifting points of the ultra-long boom 1. As a floating lifting platform, the floating crane vessel's inherent stability and large-tonnage lifting capacity provide a more reliable foundation for the lifting of the ultra-long boom 1. Simultaneously, optimizing the total number of hooks to five, compared to eight lifting points, means that each hook needs to connect one or more lifting points. This configuration is not simply about increasing the number of hooks, but rather about optimizing the connection relationship between hooks and lifting points. While meeting the requirements of a composite force-bearing lifting system, it effectively reduces the number of hooks requiring independent operation, thereby simplifying the operation process and reducing the complexity of the lifting operation. In step S3, the eight lifting points are connected to these five hooks using wire ropes, constructing a more streamlined lifting system that still provides composite force support. This streamlined hook configuration, combined with the stability and precise control capabilities of the floating crane, enables more efficient and accurate operation when making multi-degree-of-freedom position and attitude fine-tuning of boom 1 in step S4.

[0031] In a preferred embodiment, one of the floating crane vessels A2 is equipped with a first main hook 21 and a second main hook 22. In step S3, the specific method of suspending the ropes on the floating crane vessel A2 is as follows: a steel wire rope is connected to both sides of the first main hook 21 and the second main hook 22, and the other end of the two steel wire ropes is connected to a lifting point, so that the first main hook 21 and the second main hook 22 are each connected to two lifting points.

[0032] In this embodiment, the first main hook 21 and the second main hook 22 are two main lifting hooks configured on the floating crane vessel A2. The main hooks typically have a larger lifting capacity and a more sophisticated control system, used to bear the main load of the boom 1. They can be hooks fixedly installed on the floating crane vessel or movable, adjustable hooks to adapt to different lifting conditions. For example, these main hooks can be hydraulically driven telescopic hooks or hooks that are raised, lowered, and moved laterally via a wire rope winch system. The other ends of the two wire ropes are each connected to a lifting point, clearly defining two wire ropes extending from both sides of the main hooks, each connected to an independent lifting point on the boom 1. This connection method allows each main hook to act simultaneously at two different positions on the boom 1, thereby achieving more uniform force transmission and more precise attitude control. For example, the ends of the wire ropes can be equipped with shackles, shackles, or special connectors for reliable connection to the lifting points on the boom 1. Each main hook is connected to two lifting points on boom 1 via two steel wire ropes, forming a "one hook, two points" connection pattern. This allows each main hook to act simultaneously on both lifting points on boom 1. This connection method enables the lifting force of a single main hook to be distributed to two different positions on boom 1 via the two steel wire ropes, thereby increasing the support and control of local areas of boom 1 while maintaining the overall lifting capacity. When fine-tuning of boom 1 is required, the lifting or lateral movement of the first main hook 21 or the second main hook 22 on the floating crane vessel A2 is independently controlled. The force is transmitted to the two lifting points simultaneously via the two steel wire ropes, forming a more stable couple or torque. This allows for more precise and smooth adjustment of the pitch, roll, or yaw attitude of boom 1. Compared to traditional "one hook, one point" or simple multi-hook connection methods, this "one hook, two points" connection mode significantly enhances the precise control of the boom 1's attitude by a single hook, effectively preventing boom 1 from twisting or swaying due to uneven local stress during hoisting. When making multi-degree-of-freedom position and attitude fine-tuning, this connection method provides a more stable torque, making the adjustment process of boom 1 smoother and more precise, thereby greatly improving the success rate and safety of ultra-long boom 1 during pin-connection installation.

[0033] In a preferred embodiment, another floating crane vessel B3 is equipped with a third main hook 31, a fourth main hook 32, and an auxiliary hook 33. In step S3, the rope attachment method of the floating crane vessel B3 includes: for the two independent third main hooks 31 and fourth main hooks 32, a single steel wire rope is used, with a lifting point connected to the middle part by a shackle, and the two ends of the steel wire rope are attached to the third main hook 31 and the fourth main hook 32; for the auxiliary hook 33, a steel wire rope is connected to each of its two sides, and the other end of each of the two steel wire ropes is connected to a lifting point.

[0034] In this embodiment, both the three independent third main hooks 31 and the four main hooks 32 use a single wire rope, with a shackle connecting the middle section to a lifting point. The two ends of the wire rope are attached to the three main hooks 31 and the four main hooks 32. This rope attachment method aims to connect one lifting point with a single wire rope and distribute the force on the wire rope using the two hanging points of the hooks (or by forming two hanging points through a pulley system), thereby improving the stability and safety of the connection. Specifically, the two ends of the wire rope can be directly attached to the two independent hanging points of the three main hooks 31 or the four main hooks 32, forming a U-shaped or V-shaped connection, with a shackle connecting the middle section to a lifting point on the boom 1; or, the wire rope can be attached to the three main hooks 31 or the four main hooks 32 through a pulley system or a balance beam, with the two ends of the pulley system or balance beam connected to the wire rope, and the middle section of the wire rope connected to the lifting point through a shackle. This "double-point hook, single-point load-bearing" connection method allows the load borne by a single lifting point to be evenly transferred to the main hook through both ends of a single wire rope, effectively dispersing the local stress of the wire rope at the hook and improving the reliability and safety of the connection. Simultaneously, this connection method provides a more stable load-bearing foundation for subsequent fine-tuning. For the auxiliary hook 33, a wire rope is connected to each side, with each end of the two wire ropes connected to a lifting point. This rope-hanging method allows one auxiliary hook 33 to connect to two lifting points simultaneously. This "single-point hook, double-point load-bearing" connection method enables one auxiliary hook 33 to simultaneously support and control two lifting points. When the total number of hooks is limited but the number of lifting points is large, this design effectively utilizes the load-bearing capacity of the auxiliary hook 33, increasing the connection density between the lifting points and the hook, thereby enhancing the control over the overall posture of the boom 1. For example, the attachment point of the auxiliary hook 33 can be equipped with a forked structure or connecting ring, and two independent steel wire ropes are respectively connected to these forked structures or connecting rings, and then each is connected to a lifting point; or, the auxiliary hook 33 is connected through a balance beam or lifting device, and two steel wire ropes are respectively connected to the two ends of the balance beam, and each of the two steel wire ropes is connected to a lifting point.

[0035] Through this combined rope-hanging strategy, floating crane B3 can efficiently manage the lifting points it is responsible for, working together with floating crane A2 to construct a more refined and stable composite force-bearing lifting system. This refined rope-hanging design ensures more balanced force distribution at each lifting point during the lifting process, further controlling the deflection deformation of boom 1. This provides a solid foundation for the subsequent multi-degree-of-freedom position and attitude fine-tuning of boom 1 in step S4, thereby meeting the high-precision pin-connection installation requirements.

[0036] In a preferred embodiment, the first main hook 21 of the floating crane A2 connects the first lifting point 11 and the third lifting point 13, and the second main hook 22 connects the second lifting point 12 and the fourth lifting point 14; the third main hook 31 of the floating crane B3 connects the fifth lifting point 15, the fourth main hook 32 connects the sixth lifting point 16, and the auxiliary hook 33 connects the seventh lifting point 17 and the eighth lifting point 18. The first lifting point 11, the third lifting point 13, the second lifting point 12, and the fourth lifting point 14 are located on one side of the center of gravity 10 of the boom 1, while the fifth lifting point 15, the sixth lifting point 16, the seventh lifting point 17, and the eighth lifting point 18 are located on the other side of the center of gravity 10 of the boom 1.

[0037] In this embodiment, to ensure the safety and assembly accuracy of the boom 1 lifting operation, and considering the structural characteristics of the boom 1—its extra-long length, high flexibility, numerous lifting points, and long distribution area—and the number and location of the lifting points, two floating crane vessels are used to achieve a composite lifting configuration with five hooks connecting eight lifting points, thus constructing a refined composite force-bearing lifting system. Specifically, the first main hook 21 and the second main hook 22 of floating crane vessel A2 are respectively connected to two lifting points on one side of the center of gravity position 10 of boom 1, such as the first lifting point 11 and the third lifting point 13, and the second lifting point 12 and the fourth lifting point 14. This "one hook, two points" connection method allows floating crane vessel A2 to efficiently cover four lifting points on one side of boom 1, achieving balanced load distribution on that side. At the same time, the third main hook 31 and the fourth main hook 32 of floating crane vessel B3 are independently connected to the fifth lifting point 15 and the sixth lifting point 16 on the other side of the center of gravity position 10 of boom 1, providing direct and independent force control for these key lifting points. Furthermore, the auxiliary hook 33 of the floating crane vessel B3 also connects to the seventh lifting point 17 and the eighth lifting point 18, further improving the load distribution on the other side of the boom 1. This combined connection strategy, where some hooks are responsible for multiple lifting points to achieve wide-area load sharing, and some hooks are responsible for a single lifting point to provide fine-grained control, enables the entire lifting system to maintain overall stability while possessing the ability to precisely adjust the local stress on the boom 1. Through this carefully designed connection relationship, the stress on each hook can be effectively coordinated, ensuring that the boom 1 is subjected to uniform stress during lifting, thereby significantly reducing the deflection deformation of the boom 1 under its own weight, and providing a solid force foundation for subsequent multi-degree-of-freedom position and attitude fine-tuning in the suspended state. This connection method, combined with the synchronous movement of the crane vessel and the independent control of the hook assembly, greatly improves the stability and accuracy of lifting the ultra-long boom 1.

[0038] In a preferred embodiment, in step S3, two floating cranes are first arranged side by side to berth the transport vessel 4, with one floating crane positioned at the bow of the transport vessel 4 and the other at the stern. After the anchor is secured, the hooks of the two floating cranes are connected to their respective lifting points.

[0039] In this embodiment, a specific vessel arrangement allows two floating crane vessels to cover the entire length of the ultra-long boom 1 in optimal posture and position, providing uniform and stable support for the boom 1. By placing the floating crane vessels at both ends of the transport vessel 4, the self-weight load of the boom 1 can be effectively distributed, avoiding local stress concentration and providing sufficient space for subsequent lifting point connections and lifting operations. Based on this, after the floating crane vessels have stabilized through anchoring or other means, the hook is then connected to each lifting point. This sequence of positioning followed by stabilization ensures that the lifting system has a high degree of stability in the initial stage, laying a solid foundation for subsequent lifting operations. This arrangement and stabilization method is closely integrated with other steps in the aforementioned lifting method. For example, when determining the lifting point position in S2, the parameters of the lifting equipment are considered, and the specific arrangement of the floating crane vessels in this solution is precisely to optimize the application of these lifting equipment parameters, ensuring that the hook can effectively act on the lifting points. More importantly, this stable initial state greatly reduces the difficulty and risk of fine-tuning the multi-degree-of-freedom position and attitude of the boom 1 in step S4. Since the floating crane itself is already stable, the connection between the hook and the lifting point is more reliable. Therefore, when making fine adjustments, the attitude of boom 1 can be controlled more precisely, reducing unnecessary swaying and external interference, thereby meeting the high-precision pin docking installation requirements.

[0040] For specific shipping methods, please refer to [link / reference]. Figures 3-5 The two floating crane vessels were first positioned side-by-side and berthed on transport vessel 4. After completing the rope attaching and related inspections, the lifting and transfer began. The two floating crane vessels moved synchronously, smoothly, and slowly using the anchoring system until boom 1 reached the installation position of crane 5.

[0041] In a preferred embodiment, step S2 involves determining the location of the lifting point at the strong structural part, specifically by setting the lifting point at the truss node, reinforcing rib, or main beam joint of the boom 1.

[0042] In this embodiment, by precisely setting the lifting points at the truss nodes, reinforcing ribs, or main beam joints of boom 1, combined with the steps S1 (establishing a three-dimensional mechanical model and determining the center of gravity position 10 and structural strength distribution characteristics) and S2 (determining the lifting point positions based on this), a more optimized and reliable lifting strategy is formed. These specific structural locations, such as truss nodes, reinforcing ribs, and main beam joints, are areas where boom 1 was designed with high stress concentration and load transfer efficiency in mind, possessing natural structural advantages. When the lifting points are precisely arranged at these locations, the concentrated load generated during lifting can directly act on the strongest and most load-bearing area of ​​boom 1, thereby maximizing the utilization of boom 1's own structural strength. This precise lifting point positioning method not only effectively avoids local stress concentration and structural damage that may result from setting lifting points in non-strong structural areas, but also ensures that the lifting load is transferred and dispersed more evenly and efficiently within boom 1. Therefore, during the hoisting process, the overall stress state of boom 1 will be more ideal, significantly reducing the deflection deformation of boom 1 under its own weight, and providing a more stable structural foundation for subsequent precise attitude fine-tuning and pin docking installation.

[0043] In a preferred embodiment, the horizontal distance between each of the lifting points and the center of gravity position 10 is controlled within the range of 1 / 6 to 1 / 2 of the total length of the boom 1.

[0044] In this embodiment, by controlling the horizontal distance of each lifting point from the center of gravity 10 of the boom 1 to within 1 / 6 to 1 / 2 of the total length of the boom 1, combined with the above-mentioned lifting method, the stress state of the ultra-long boom 1 is further optimized. In step S2, although lifting points have been determined at the strong structural parts, if these lifting points are too close to the center of gravity, it may lead to insufficient lifting torque, making it difficult to effectively control the attitude of the boom 1; if they are too far from the center of gravity, it may generate excessive bending moment, increasing the structural risk of the boom 1. By limiting the horizontal distance to a moderate range of 1 / 6 to 1 / 2, it is ensured that the lifting points can provide sufficient torque to achieve stable control and multi-degree-of-freedom fine adjustment of the boom 1, while avoiding excessive bending moment and stress concentration due to excessive lever arm length. This precise geometric layout allows the lifting load to be distributed more evenly and rationally on the strong structural parts of boom 1, thereby effectively suppressing the deflection and vibration of boom 1 throughout the entire lifting process, especially during the fine-tuning of position and attitude in the suspended state, and providing a solid structural stability guarantee for high-precision pin docking installation.

[0045] As a preferred embodiment, in step S1, after establishing the three-dimensional mechanical model of the boom 1, a model verification and correction step is also included: weighing and measuring the center of gravity of the boom 1 on site to obtain measured data of the actual weight and the center of gravity position 10; verifying the measured data with the theoretical data calculated by the three-dimensional mechanical model; and correcting the parameters of the three-dimensional mechanical model based on the verification results to improve the consistency between the model and the actual lifting conditions.

[0046] In this embodiment, by introducing model verification and correction steps, after establishing the three-dimensional mechanical model of boom 1, it no longer relies solely on theoretical calculations, but further obtains measured data of the actual weight and center of gravity position 10 of boom 1 through on-site weighing and center of gravity measurement. This measured data is then rigorously verified against the theoretical data calculated by the three-dimensional mechanical model. If a deviation is found between the theoretical model and the actual situation, the parameters of the three-dimensional mechanical model are corrected based on the verification results. This series of operations ensures that the three-dimensional mechanical model used closely matches the actual physical characteristics of boom 1 and the actual lifting conditions. In this way, when subsequently determining the location and number of lifting points, the model can provide a more accurate center of gravity position 10 and structural strength distribution characteristics, thereby making the lifting point arrangement more reasonable and effectively reducing the deflection deformation of boom 1 under its own weight. Simultaneously, when controlling the crane vessel to synchronously lift boom 1 and perform multi-degree-of-freedom position and attitude fine-tuning, the modified high-precision model can more accurately predict the dynamic response of boom 1, achieving more refined control and ultimately meeting the high-precision pin docking installation requirements, significantly improving the reliability and safety of the entire lifting method. Thus, through the "modeling-measurement-verification" process, the consistency between the boom 1 model during the simulated lifting process and the actual boom 1 lifting conditions is effectively improved, making the simulated lifting more valuable for engineering reference and providing reliable data support for subsequent lifting point layout and stress analysis.

[0047] In summary, the lifting method of this invention utilizes the coordinated operation of two floating cranes and employs a reasonable hook distribution and a special rope-hanging method to achieve balanced force distribution on the boom 1 during lifting, reducing the impact of deflection caused by its own weight on the pin installation accuracy. Furthermore, the special rope-hanging method used by the dual floating cranes allows the boom 1 to be adjusted in multiple directions and angles during pin installation, facilitating pin installation and offering the following advantages: (1) Balanced force: By optimizing the rope hanging method, the force on each lifting point of the ultra-long boom 1 is more balanced during the hoisting process, which effectively avoids the structural stress concentration caused by local eccentric load. At the same time, it significantly reduces the bending deformation of boom 1 under its own weight, and reduces the impact of deformation on the installation accuracy of the root pin.

[0048] (2) Flexible installation: Relying on the coordinated operation of the double floating crane, combined with the distribution of hooks and special rope hanging method, the boom 1 has the adjustment margin to be finely adjusted in multiple directions and angles during the pin installation process. The staff can flexibly adjust the posture of the boom 1 according to the actual situation on site, which significantly improves the convenience and success rate of pin docking installation.

[0049] (3) Redundancy guarantee: Multi-point hoisting provides the ability to redistribute the load. Even if individual hoisting points are affected by environmental factors and the stress fluctuates, the overall hoisting still has good safety redundancy.

[0050] 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 hoisting method for an ultra-long boom, characterized in that, Includes the following steps: S1. Establish a three-dimensional mechanical model of the boom to determine its overall center of gravity and structural strength distribution characteristics; S2. Based on the center of gravity position, structural strength distribution characteristics and parameters of the lifting equipment, determine the position and number of multiple lifting points in the strong structural parts on both sides of the center of gravity position of the boom to reduce the deflection deformation of the boom under its own weight. S3. At least two crane vessels are used to work together. The total number of hooks provided by the crane vessels is less than the total number of lifting points. Each lifting point is connected to a different hook by steel wire rope to construct a composite force-bearing lifting system. S4. Control each of the crane vessels to move synchronously to lift the boom, and by independently controlling different hook groups in the composite force-bearing lifting system, perform multi-degree-of-freedom position and attitude fine-tuning of the boom in the suspended state to meet the high-precision pin docking installation requirements.

2. The hoisting method for an ultra-long boom according to claim 1, characterized in that, The number of lifting points is eight, with four lifting points on each side of the center of gravity of the boom.

3. The hoisting method for an ultra-long boom according to claim 2, characterized in that, The crane vessels consist of two floating crane vessels, and the total number of hooks is five.

4. The hoisting method for an ultra-long boom according to claim 3, characterized in that, One of the floating crane vessels, A, is equipped with a first main hook and a second main hook. The specific method of attaching the rope to floating crane vessel A in step S3 is as follows: A steel wire rope is connected to both sides of the first and second main hooks, and the other end of each steel wire rope is connected to a lifting point, so that both the first and second main hooks are connected to two lifting points.

5. The hoisting method for an ultra-long boom according to claim 3, characterized in that, Another floating crane vessel B is equipped with a third main hook, a fourth main hook, and an auxiliary hook. In step S3, the method of attaching the ropes to floating crane vessel B includes: For the two independent third and fourth main hooks, a single steel wire rope is used, with a lifting point connected in the middle by a shackle, and the two ends of the steel wire rope are hung on the third and fourth main hooks; For the auxiliary hook, a steel wire rope is connected to each side, and the other end of each steel wire rope is connected to a lifting point.

6. The hoisting method for an ultra-long boom according to claim 3, characterized in that, The specific connection relationship between the eight lifting points and the five lifting hooks is as follows: The first main hook of the floating crane vessel A connects the first lifting point and the third lifting point, and the second main hook connects the second lifting point and the fourth lifting point; The third main hook of the floating crane B is connected to the fifth lifting point, the fourth main hook is connected to the sixth lifting point, and the auxiliary hook is connected to the seventh and eighth lifting points. The first, third, second, and fourth lifting points are located on one side of the boom's center of gravity, while the fifth, sixth, seventh, and eighth lifting points are located on the other side of the boom's center of gravity.

7. The hoisting method for an ultra-long boom according to claim 1, characterized in that, In step S3: First, two floating crane vessels are arranged side by side to berth the transport vessel, with one floating crane vessel positioned at the bow and the other at the stern. After the anchor is secured, the hooks of the two floating crane vessels are connected to their respective lifting points.

8. The hoisting method for an ultra-long boom according to claim 1, characterized in that, In step S2, the location of the lifting point is determined at the strong structural part, specifically including setting the lifting point at the truss node, reinforcing rib or main beam joint of the boom.

9. The hoisting method for an ultra-long boom according to claim 1, characterized in that, The horizontal distance between each lifting point and the center of gravity is controlled within 1 / 6 to 1 / 2 of the total boom length.

10. The hoisting method for an ultra-long boom according to claim 1, characterized in that, In step S1, after establishing the three-dimensional mechanical model of the boom, a model verification and correction step is also included: The boom was weighed and its center of gravity was measured on site to obtain actual weight and center of gravity position data. The measured data are compared with the theoretical data calculated by the three-dimensional mechanical model; Based on the verification results, the parameters of the three-dimensional mechanical model are corrected to improve the consistency between the model and the actual hoisting conditions.

Images