Heavy-lift Hoisting Method for Full Rotation of Floating Crane Vessel Combined with Fixed Stern Crane

Abstract

The present invention discloses a method for hoisting heavy components by a floating crane ship with full rotation combined with a fixed stern crane, which belongs to the field of marine construction technology and includes the following steps: The floating crane ship moves to a preset position; The transport ship berths alongside the floating crane ship, and goods are placed on the transport ship; Multiple cables are used to connect the floating crane ship and the transport ship; Control the main hoist of the floating crane ship to move above the goods; Connect the sling of the main hoist and the goods; The main hoist hoists the goods and drives the transport ship to move close to the stern of the floating crane ship until the length direction of the transport ship is perpendicular to the length direction of the floating crane ship; Control the main hook of the main hoist to move above the center of gravity of the goods and drive the goods to leave the transport ship; Control the floating crane ship to approach the target installation position to complete the installation of the goods. The method for hoisting heavy components by the floating crane ship with full rotation combined with a fixed stern crane provided by the present invention is convenient for the hanging and installation of slings, and has high safety and low construction risks.

Description

Technical Field

[0001] The present invention relates to the technical field of marine construction, and particularly relates to a method for hoisting heavy components by combining the full rotation of a floating crane ship and a fixed stern crane. Background Art

[0002] The construction of offshore wind power and marine engineering involves the hoisting requirements of many heavy objects, such as jacket platforms, upper modules, large monopile construction, etc. Their weights generally reach 2,000 - 3,000 tons, and large floating crane ships are usually used for hoisting construction.

[0003] In the prior art, the lifting capacity of the full - rotation side crane of a floating crane ship is generally 2,000 - 3,000 tons, and the maximum lifting capacity of a fixed stern crane is generally 3,000 - 5,000 tons. The safe lifting capacity of the crane decreases with the increase of the lifting span. From the perspective of construction convenience, the method of docking the ship alongside and lifting from the side is generally adopted for construction. However, for heavy objects that exceed the side - lifting capacity, the method of using a fixed stern crane is required for construction.

[0004] However, in the prior art, after the transport ship docks at the stern of the floating crane ship, the sling is installed. However, the construction process of the fixed stern crane has the problem of poor resistance to wind and waves, resulting in asynchronous movement of the floating crane ship and the transport ship, and a relatively large amplitude of relative movement. It is very difficult to install the sling buckle, which further leads to a relatively high construction risk and low safety. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for hoisting heavy components by combining the full rotation of a floating crane ship and a fixed stern crane, which is convenient for installing the sling buckle, has high safety and low construction risk.

[0006] As such a concept, the technical solution adopted by the present invention is as follows:

[0007] A method for hoisting heavy components by combining the full rotation of a floating crane ship and a fixed stern crane, comprising the following steps:

[0008] The floating crane ship moves to a preset position;

[0009] The transport ship berths alongside the floating crane ship, and the goods are placed on the transport ship;

[0010] Multiple cables are used to connect the floating crane ship and the transport ship;

[0011] Control the main crane of the floating crane ship to move above the goods;

[0012] Connect the sling of the main crane and the goods;

[0013] By controlling the force on the main hook of the main crane and the rotation of the main crane, the transport ship is driven to move towards the stern of the floating crane ship until the length direction of the transport ship is perpendicular to the length direction of the floating crane ship, so that the cargo is within the allowable lifting capacity range of the floating crane ship;

[0014] The cable winch tightens the cable to keep the transport ship stable;

[0015] Control the main hook of the main crane to move above the center of gravity of the cargo and lift the cargo off the transport ship;

[0016] Control the floating crane ship to approach the target installation position, and use the cable to adjust the direction of the cargo to complete the installation of the cargo.

[0017] Optionally, the cargo is bound to the transport ship. During the process of connecting the sling of the main crane and the cargo, part of the binding of the cargo is released; after the main hook of the main crane moves above the center of gravity of the cargo, the binding of the cargo is completely released.

[0018] Optionally, after the main crane of the floating crane ship lifts the cargo off the transport ship, control the transport ship to leave the floating crane ship.

[0019] Optionally, during the process of the transport ship transferring towards the stern of the floating crane ship, the moving direction and speed of the transport ship are controlled by the main crane, and multiple cables assist in controlling the stability of the transport ship during the transfer process.

[0020] Optionally, after the floating crane ship is located at the preset position, the floating crane ship is anchored according to the preset anchor point diagram.

[0021] Optionally, four first anchor cables are arranged at the bow of the floating crane ship, and four second anchor cables are arranged at the stern of the floating crane ship. An included angle is formed between adjacent two of the first anchor cables, and an included angle is formed between adjacent two of the second anchor cables.

[0022] Optionally, when the floating crane ship is located at the preset position, it is positioned with the bow facing the oncoming current direction or the wave direction.

[0023] Optionally, the distance between the preset position and the target installation position is 200 - 300 meters.

[0024] Optionally, multiple cables are respectively connected to the stern of the floating crane ship, and the bow, stern and middle part of the transport ship are respectively connected with the cables.

[0025] Optionally, during the process of driving the transport ship to move towards the stern of the floating crane ship by controlling the force on the main hook of the main crane and the rotation of the main crane, the anchor boat follows the transport ship and the distance between them is less than a preset distance.

[0026] The present invention has at least the following beneficial effects:

[0027] The heavy-lift hoisting method of the floating crane ship with full rotation combined with a fixed stern crane provided by the present invention uses the method of the full-rotation floating crane ship with a fixed stern crane to solve the problem of insufficient side-lifting capacity of the floating crane ship. By cleverly utilizing the characteristics of the full-rotation crane, the method of installing the cargo sling on the side of the transport ship and then rotating the entire transport ship to the stern solves the problem of sling installation in the traditional stern-crane construction method. By berthing the transport ship against the side of the floating crane ship so that the two ships are arranged in parallel, and at the same time positioning against the swell or the current, the relative motion amplitude between the two ships can be effectively reduced, which is beneficial to the hanging and installation of the sling, reduces the operation difficulty and ensures the operation safety. At the same time, the small crane on the side of the floating crane ship can assist in operations such as hanging and transporting materials, improving the operation efficiency. Description of the Drawings

[0028] Figure 1 is a flowchart of the heavy-lift hoisting method of the floating crane ship with full rotation combined with a fixed stern crane provided by the embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of the transport ship berthing against the side of the floating crane ship provided by the embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of the transport ship moving around the floating crane ship provided by the embodiment of the present invention;

[0031] Figure 4 is a schematic diagram when the transport ship and the floating crane ship are perpendicular provided by the embodiment of the present invention;

[0032] Figure 5 is a schematic diagram of hoisting and installation provided by the embodiment of the present invention.

[0033] In the figure:

[0034] 1. Floating crane ship; 11. Main crane; 12. Sling; 13. Auxiliary small crane; 2. Transport ship; 31. First cable; 32. Second cable; 33. Third cable; 34. Fourth cable; 35. Fifth cable; 41. First anchor cable; 42. Second anchor cable; 51. Bow anchor; 52. Stern anchor; 6. Anchor boat; 10. Cargo; 20. Target installation position. Detailed Embodiments

[0035] To make the technical problems solved by the present invention, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Additionally, it should be noted that for the sake of convenience of description, only the parts related to the present invention are shown in the drawings rather than all of them.

[0036] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the upper part", and "on the upper surface" of the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the lower part", and "on the lower surface" of the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0039] This embodiment provides a method for hoisting heavy components by a floating crane ship with full rotation combined with a fixed stern crane, which is convenient for the hanging and installation of slings and has high safety and low construction risks. The method for hoisting heavy components by a floating crane ship with full rotation combined with a fixed stern crane provided in this embodiment is applicable to the hoisting of heavy objects at sea, and moreover, the method for hoisting heavy components by a floating crane ship with full rotation combined with a fixed stern crane is realized through a floating crane ship, a transport ship, cables, etc.

[0040] As Figure 1 shown, the method for hoisting heavy components by a floating crane ship with full rotation combined with a fixed stern crane includes the following steps:

[0041] S1. The floating crane ship 1 moves to a preset position.

[0042] In this embodiment, first control the floating crane ship 1 to move to a preset position, which is a position not far from the target installation position 20. The floating crane ship 1 is also called a crane ship. Specifically, it is a floating platform carrying a crane. It can move the goods 10 to any required place within the port, either berthing or moving to an anchorage to transship the goods 10. A floating crane can usually lift overweight goods 10. The floating crane ship 1 is mainly used as a port service ship for loading and unloading large goods 10. There is a lifting device on the ship. The main crane 11 (or boom) has fixed and rotary types, and the lifting capacity generally ranges from several hundred tons to several thousand tons. It can also be used as a port engineering ship.

[0043] In some embodiments, the distance between the preset position and the target installation position 20 is 200 - 300 meters. Preferably, the distance between the preset position and the target installation position 20 is 250 meters, so that the heavier goods 10 can first move to the preset position through the transport ship 2, and then be installed by the floating crane ship 1, so that the distance for the floating crane ship 1 to carry the goods 10 can be shorter, improving the installation efficiency.

[0044] Optionally, after the floating crane ship 1 is located at the preset position, anchor the floating crane ship 1 according to a preset anchor point map, so that the floating crane ship 1 can be relatively stable and the moving speed and direction can be controlled, facilitating the installation of the goods 10. In this embodiment, the preset anchor point map can be a "spade anchor" to have better stability.

[0045] Furthermore, as Figure 2 shown, four first anchor cables 41 are arranged at the bow of the floating crane ship 1, and four second anchor cables 42 are arranged at the stern of the floating crane ship 1. There is an included angle between two adjacent first anchor cables 41, that is, two adjacent first anchor cables 41 are arranged at an included angle. There is an included angle between two adjacent second anchor cables 42, that is, two adjacent second anchor cables 42 are arranged at an included angle. The positioning of the floating crane ship 1 is achieved through 8 anchor cables. The maximum included angle between the two farthest first anchor cables 41 is greater than 90 degrees and less than 180 degrees; the maximum included angle between the two farthest second anchor cables 42 is greater than 90 degrees and less than 180 degrees.

[0046] S2. The transport ship 2 berths alongside the floating crane ship 1, and the goods 10 are placed on the transport ship 2.

[0047] After the floating crane ship 1 moves to the preset position, control the transport ship 2 to berth alongside the floating crane ship 1, and as Figure 2As shown, the transport ship 2 berths alongside the floating crane ship 1. That is to say, the moving direction of the floating crane ship 1 is the same as that of the transport ship 2. Moreover, the length direction of the floating crane ship 1 is parallel to the length direction of the transport ship 2. By berthing the transport ship 2 alongside the floating crane ship 1, since their moving directions are the same, it is convenient to control the synchronization of the movements of the transport ship 2 and the floating crane ship 1, and thus the relative movement amplitude between the two can be reduced.

[0048] In some embodiments, the floating crane ship 1 and the transport ship 2 can be controlled to move in the same direction at the same speed so that they remain relatively stationary. In some other embodiments, after the floating crane ship 1 moves to a preset position, the driving force of the floating crane ship 1 can be cancelled. And after the transport ship 2 berths alongside the floating crane ship 1, the driving force of the transport ship 2 can be cancelled. At this time, the floating crane ship 1 and the transport ship 2 are only driven by the waves, which is convenient for the floating crane ship 1 and the output ship to be relatively stationary.

[0049] S3. Connect the floating crane ship 1 and the transport ship 2 with multiple cables.

[0050] In this embodiment, one end of the cable is connected to the floating crane ship 1 and the other end is connected to the transport ship 2. By taking in and paying out different cables, the transport ship 2 can be pulled to move relative to the floating crane ship 1. In this embodiment, a constant tension winch can be provided on the floating crane ship 1. Multiple cables are respectively wound around the constant tension winch, and the multiple cables are independent of each other, so that pulling one cable does not affect other cables. The number of cables can be 5 - 6. In this embodiment, there are 5 cables.

[0051] S4. Control the main hoist 11 of the floating crane ship 1 to move above the cargo 10.

[0052] The main hoist 11 of the floating crane ship 1 in this embodiment is a full-rotation type. That is to say, the main hoist 11 can rotate relative to the floating crane ship 1 by an angle exceeding 180 degrees. The main hoist 11 moves above the cargo 10 on the transport ship 2 to facilitate the installation of the sling 12. In some embodiments, the main hoist 11 moves directly above the cargo 10.

[0053] It should be noted that the order of steps S3 and S4 can be adjusted. For example, step S4 can be executed first and then step S3. This embodiment does not make a limitation on this. Or, steps S3 and S4 can also be carried out simultaneously, that is, while connecting the floating crane ship 1 and the transport ship 2 with multiple cables, control the main hoist 11 of the floating crane ship 1 to move above the cargo 10.

[0054] S5. Connect the sling 12 of the main hoist 11 and the cargo 10.

[0055] After moving the main crane 11 above the cargo 10, connect the sling 12 and the cargo 10. In some embodiments, connection structures such as hooks and lifting rings are provided on the cargo 10, and the connection between the main crane 11 and the cargo 10 is achieved by hanging and installing the sling 12 on the hook.

[0056] In step S5, an auxiliary small crane 13 can be provided on the floating crane ship 1. The auxiliary small crane 13 can be used to assist in connecting the sling 12 and the cargo 10 to improve the operation efficiency.

[0057] S6. By controlling the force on the main hook of the main crane 11 and the rotation of the main crane 11, drive the transport ship 2 to move towards the stern of the floating crane ship 1 until the length direction of the transport ship 2 is perpendicular to the length direction of the floating crane ship 1, so that the cargo 10 is within the allowable lifting capacity range of the floating crane ship 1.

[0058] In this embodiment, as Figure 3 shown, the transport ship 2 moves around the floating crane ship 1 with the stern of the floating crane ship 1 as the center until it moves to the Figure 4 shown position. At this time, the transport ship 2 and the floating crane ship 1 are in a "T" shape or a "T-shaped" configuration. In this embodiment, the cargo 10 can be moved by the main crane 11, and the cargo 10 is fixed on the transport ship 2. Therefore, the transport ship 2 can follow the movement of the cargo 10 and the main crane 11. That is, in this embodiment, the movement direction and movement speed of the transport ship 2 are mainly adjusted by the force of the main hook of the main crane 11.

[0059] Optionally, during the process of the transport ship 2 transferring to the stern of the floating crane ship 1, the movement direction and movement speed of the transport ship 2 are controlled by the main crane 11. For the specific position of the main crane 11 of the floating crane ship 1, refer to the prior art.

[0060] By adjusting the extending or retracting lengths of multiple cables, the stability of the transport ship 2 is ensured. In this embodiment, cables are respectively connected to the bow, stern, and middle part of the transport ship 2. Specifically, the five cables include the first cable 31, the second cable 32, the third cable 33, the fourth cable 34, and the fifth cable 35. One end of the first cable 31 is connected to one end of the stern of the floating crane ship 1, and the other end is connected to the bow of the transport ship 2. One end of the second cable 32 is connected to the other end of the stern of the floating crane ship 1, and the other end is connected to the middle part of the transport ship 2. One end of the third cable 33 is connected to a position near the bow in the middle part of the floating crane ship 1, and the other end is connected to the stern of the transport ship 2. One end of the fourth cable 34 is connected to the stern of the floating crane ship 1 and is located between one end of the first cable 31 and one end of the second cable 32, and the other end of the fourth cable 34 is connected to the transport ship 2 and is located between the other end of the first cable 31 and the other end of the second cable 32. One end of the fifth cable 35 is connected to the middle part of the floating crane ship 1, and the other end is connected to the transport ship 2 and is located between the other end of the second cable 32 and the other end of the third cable 33. During the movement of the transport ship 2, the constant tension winch can gradually retract the first cable 31 and the fourth cable 34, and simultaneously pay out the third cable 33 and the fifth cable 35 to ensure that the transport ship 2 moves around the stern of the floating crane ship 1.

[0061] Optionally, in step S6, according to the water flow direction, a bow anchor 51 and a stern anchor 52 can be selected to be dropped for the transport ship 2 to stabilize the transport ship 2, so that the transport ship 2 can smoothly move to the stern of the floating crane ship 1.

[0062] In this embodiment, after step S6, the cable winch can be controlled to tighten the cables to keep the transport ship stable. The specific method of the cable winch tightening the cables is not elaborated in this embodiment.

[0063] S7. Control the main hook of the main crane 11 to move above the center of gravity of the cargo 10 and lift the cargo 10 off the transport ship 2.

[0064] After the transport ship 2 and the floating crane ship 1 are perpendicular, it is necessary to control the main hook of the main crane 11 to move above the center of the cargo 10. It should be noted that the main hook of the main crane 11 can be connected to the sling 12. Specifically, the sling 12 is connected to the main body of the main crane 11 through the main hook. When the floating crane ship 1 pulls the transport ship 2 to move, there may be an angle between the main hook and the cargo 10. At this time, there is an inclined moment when lifting the heavy object. Therefore, the position of the main hook needs to be adjusted so that the main hook is directly above the center of gravity of the cargo 10.

[0065] Optionally, in this embodiment, after the cargo 10 leaves the transport ship 2, the transport ship 2 can be controlled to leave the floating crane ship 1 to avoid interfering with the movement of the floating crane ship 1.

[0066] S8. Control the floating crane vessel 1 to approach the target installation position 20, and use the cable to adjust the direction of the cargo 10 to complete the installation of the cargo 10.

[0067] In this embodiment, after the floating crane vessel 1 hoists the cargo 10, the floating crane vessel 1 hauls the anchor and moves the ship, and slowly approaches the target installation position 20. At the same time, use the cable to adjust the direction of the cargo 10 to ensure that the hook is loosened until it is not under force after the installation alignment, thereby realizing the hoisting of the cargo 10. Figure 5 It is a schematic diagram of the hoisting and installation provided in this embodiment.

[0068] For the heavy-lift hoisting method of the full-rotation floating crane vessel combined with the fixed stern crane provided in this embodiment, after the floating crane vessel 1 moves to the preset position, first control the transport ship 2 to berth alongside the floating crane vessel 1, then connect the main hoist 11 with the cargo 10, and then control the transport ship 2 to move around the stern of the floating crane vessel 1 through the main hoist 11 until the length direction of the transport ship 2 is perpendicular to the length direction of the floating crane vessel 1. Then hoist the cargo 10 through the floating crane vessel 1. By berthing the transport ship 2 alongside the floating crane vessel 1, since their movement directions are the same, it is convenient to control the synchronization of the movement of the transport ship 2 and the floating crane vessel 1, thereby reducing the relative movement amplitude between the two, facilitating the installation of the sling 12, reducing the construction risk, and improving the construction safety.

[0069] Moreover, by using the method of the full-rotation floating crane vessel with a fixed stern crane, the problem of insufficient lifting capacity of the side hoisting of the floating crane vessel is solved. Cleverly utilize the characteristics of the full-rotation crane, adopt the method of berthing the transport ship alongside to install the cargo sling, and then rotate the whole transport ship to the stern, which solves the problem of sling installation in the traditional stern hoisting construction method. By berthing the transport ship alongside the floating crane vessel to make the two ships arranged in parallel, and at the same time in place against the swell or current, the relative movement amplitude between the two ships can be effectively reduced, which is beneficial to the hanging and installation of the sling, reduces the operation difficulty and ensures the operation safety. At the same time, the small side hoist of the floating crane vessel can assist in operations such as hooking and lifting materials, improving the operation efficiency.

[0070] Optionally, in this embodiment, the cargo 10 is bound to the transport ship 2. For example, the cargo 10 is sea-bound and reinforced on the transport ship 2. During the process of connecting the sling 12 of the main hoist 11 and the cargo 10, part of the binding of the cargo 10 can be released to improve the hoisting efficiency; and after the main hook of the main hoist 11 moves above the center of gravity of the cargo 10, the binding of the cargo 10 is completely released to facilitate the movement of the cargo 10.

[0071] In this embodiment, during the process of the transport ship 2 approaching the stern of the floating crane vessel 1, the main hook of the main hoist 11 remains under force, and the transport ship 2 is controlled to move through the main hoist 11, that is, the floating crane vessel 1 provides driving force for the transport ship 2. In some embodiments, the main hook of the main hoist 11 remains under force of 500 - 800 tons.

[0072] Optionally, when the floating crane vessel 1 is located at a preset position, it is positioned with its bow facing the oncoming current direction or the swell direction. The oncoming current direction is the direction of seawater flow, and the swell direction is the direction of wave propagation. That is to say, the direction from the stern of the floating crane vessel 1 towards its bow is opposite to the seawater flow direction or the wave propagation direction, which is conducive to controlling the stability of the floating crane vessel 1.

[0073] In some embodiments, when the main hoist 11 hoists the cargo 10 and drives the transport ship 2 to move close to the stern of the floating crane vessel 1 until the longitudinal direction of the transport ship 2 is perpendicular to the longitudinal direction of the floating crane vessel 1, that is to say, while performing step S6, as Figure 3 shown, an anchor boat 6 is set to move along with the transport ship 2, and the distance between the anchor boat 6 and the transport ship 2 is less than a preset distance. The anchor boat 6 guards beside the transport ship 2 and stands by at any time to assist the transport ship 2 to move when needed.

[0074] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, there are various changes and modifications to the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. Heavy-lift hoisting method for full-rotation floating crane combined with fixed stern crane, Characterized in that, It includes the following steps: The floating crane moves to the preset position; When the floating crane is at the preset position, select the bow upstream direction or the wave direction of the floating crane to take its position; The transport ship berths alongside the floating crane, and there are goods placed on the transport ship; Connect the floating crane and the transport ship with multiple cables; Control the main hoist of the floating crane to move above the goods; Connect the sling of the main hoist and the goods; By controlling the force on the main hook of the main hoist and the rotation of the main hoist, drive the transport ship to move towards the stern of the floating crane until the length direction of the transport ship is perpendicular to the length direction of the floating crane, so that the goods are within the allowable lifting capacity range of the floating crane; The winch tightens the cable to keep the transport ship stable; Control the main hook of the main hoist to move above the center of gravity of the goods and lift the goods off the transport ship; Control the floating crane to approach the target installation position, and use the cable to adjust the direction of the goods to complete the installation of the goods.

2. The heavy-lift hoisting method for full-rotation floating crane combined with fixed stern crane according to claim 1, Characterized in that, The goods are bound to the transport ship. During the process of connecting the sling of the main hoist and the goods, part of the binding of the goods is released; after the main hook of the main hoist moves above the center of gravity of the goods, the binding of the goods is completely released.

3. The heavy-lift hoisting method for full-rotation floating crane combined with fixed stern crane according to claim 1, Characterized in that, After the main hoist of the floating crane lifts the goods off the transport ship, the transport ship leaves the floating crane.

4. The heavy-lift hoisting method for full-rotation floating crane combined with fixed stern crane according to any one of claims 1-3, Characterized in that, During the process of the transport ship transferring towards the stern of the floating crane, the moving direction and moving speed of the transport ship are controlled by the main hoist, and multiple cables assist in controlling the stability of the transport ship during the transfer process.

5. The heavy-lift hoisting method for full-rotation floating crane combined with fixed stern crane according to any one of claims 1-3, Characterized in that, After the floating crane is at the preset position, the floating crane drops the anchor according to the preset anchor point diagram.

6. The heavy-lift hoisting method for full-rotation floating crane combined with fixed stern crane according to claim 5, Characterized in that, Four first anchor cables are arranged at the bow of the floating crane, and four second anchor cables are arranged at the stern of the floating crane. An included angle is formed between adjacent two of the first anchor cables, and an included angle is formed between adjacent two of the second anchor cables.

7. The heavy-lift hoisting method for full-rotation floating crane combined with fixed stern crane according to any one of claims 1-3, Characterized in that, The distance between the preset position and the target installation position is 200-300 meters.

8. The heavy-lift hoisting method for full-rotation floating crane combined with fixed stern crane according to any one of claims 1-3, Characterized in that, Multiple cables are respectively connected to the stern of the floating crane ship, and the cables are respectively connected to the bow, stern and middle part of the transport ship.

9. The method for hoisting heavy cargos by the full rotation of the floating crane ship combined with the fixed stern crane according to any one of claims 1-3, characterized in that in the process of driving the transport ship to move towards the stern of the floating crane ship by controlling the force on the main hook of the main crane and the rotation of the main crane, the anchor boat follows the transport ship and the distance between the anchor boat and the transport ship is less than a preset distance.

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