Sling assembly, installation apparatus for offshore wind power plant, and method for installing monopile

Abstract

The application discloses a sling assembly, a mounting device of an offshore wind power device, and a mounting method of an offshore single pile. The sling assembly is used for hoisting a device to be hoisted. The device to be hoisted has an initial hoisting position and a first actual hoisting position. The first actual hoisting position is axially spaced from the initial hoisting position. The sling assembly comprises a first hook part and an adjusting assembly. The adjusting assembly comprises a first hoisting rope, the first hook part being connected with the first hoisting rope. The adjusting assembly further comprises an adjusting rope group comprising at least two adjusting ropes. Each adjusting rope has a rope head end and a rope tail end. The rope head end of each adjusting rope is connected to the initial hoisting position of the device to be hoisted. The rope tail end of each adjusting rope is located at the first actual hoisting position and connected with the first hoisting rope.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering equipment, in particular, to a sling assembly, an installation device of offshore wind power device and an installation method of offshore single pile. BACKGROUND

[0002] As a supporting device, the single pile is widely used in the field of engineering equipment. The single pile is large in size, and is usually transported horizontally during transportation. After arriving at the installation site, the horizontally placed single pile needs to be lifted and placed in a vertical position for pile driving operation.

[0003] The common way is to select a suitable crane according to the parameters of the single pile when designing the single pile, and then set the initial lifting position of the single pile according to the pre-selected crane, and set the lifting lug at the initial lifting position of the single pile.

[0004] However, in the actual pile driving construction process, when multiple single piles need to be driven, multiple cranes need to be provided due to the different positions of the lifting lugs of each single pile, which increases the cost of pile driving.

[0005] Therefore, there is an urgent need to provide a technical solution that can improve the adaptability of cranes to various single piles, thereby reducing the cost of pile driving. SUMMARY

[0006] An object of the present application is to provide a new technical solution for a sling assembly, an installation device of offshore wind power device and an installation method of offshore single pile, by setting a sling assembly to improve the adaptability of cranes to various single piles.

[0007] In one aspect of the present application, a sling assembly is provided for lifting a device to be lifted, the device to be lifted having an initial lifting position and a first actual lifting position, the first actual lifting position being spaced apart from the initial lifting position in the axial direction, the sling assembly comprising a first hook portion and an adjusting assembly, the adjusting assembly comprising: a first lifting rope, the first hook portion being connected to the first lifting rope; an adjusting rope group comprising at least two adjusting ropes, each adjusting rope having a rope head end and a rope tail end, the rope head end of each adjusting rope being connected to the initial lifting position of the device to be lifted, the rope tail end of each adjusting rope being located at the first actual lifting position, and the rope tail end being connected to the first lifting rope.

[0008] By using the adjusting rope group in cooperation with the first lifting rope in the embodiment of the present application, the initial lifting position of the single pile can be moved to the first actual lifting position, so that the first actual lifting position of the single pile can be adjusted according to different single pile parameters, thereby improving the adaptability of a single crane to lift the single pile and reducing the cost of pile driving. In addition, the initial lifting position of the single pile is designed according to the parameters of the crane in advance, which simplifies the design process of the single pile.

[0009] Optionally, the hoisting assembly further comprises a stretching device, one end of which is fixed to the device to be hoisted, and the other end of which is connected to the end of the adjusting rope set located at the first actual hoisting position, and under the action of the stretching device, the adjusting rope set is in a straightened state.

[0010] Optionally, the rope tail ends of the first hoisting ropes are each provided with a connecting ring, the first hoisting ropes pass through the connecting rings of all the adjusting rope sets, and the hoisting ropes are circumferentially arranged on the outer wall of the device to be hoisted, and the two ends of the first hoisting ropes are each connected to the first hook portion.

[0011] Optionally, the first hook portion comprises a hook body and a hoisting beam, the hoisting beam comprises a beam head end and a beam tail end, one end of the first hoisting rope is connected to the beam head end, and the other end of the hoisting rope is connected to the beam tail end.

[0012] Optionally, the device to be hoisted further comprises a second actual hoisting position, and the first actual hoisting position and the second actual hoisting position are symmetrically arranged relative to the center of gravity of the device to be hoisted.

[0013] The spreader assembly further comprises a second hook portion and a second hoisting rope, and the second hook portion applies a hoisting force to the second actual hoisting position through the second hoisting rope.

[0014] Optionally, the hoisting assembly further comprises a third adjusting rope, one end of which is connected to the second hook portion, and the other end of which is provided with a hooking member for hooking the device to be hoisted.

[0015] According to another aspect of the present application, there is also provided a kind of installation equipment of offshore wind power device, and the installation equipment comprises:

[0016] The above-mentioned spreader assembly;

[0017] Single pile, the device to be hoisted comprises a single pile, and the single pile is used to support the offshore wind power device, the single pile is connected with the air bag assembly, and the single pile is provided with a first pile body lifting lug and a second pile body lifting lug, and the first pile body lifting lug and the second pile body lifting lug are located at the initial hoisting position.

[0018] The adjusting rope set comprises a first adjusting rope and a second adjusting rope, the rope head end of the first adjusting rope is connected to the first pile body lifting lug, and the rope head end of the second adjusting rope is connected to the second pile body lifting lug.

[0019] According to a third aspect of the present application, there is also provided a kind of installation equipment of offshore wind power device, and the installation equipment comprises the above-mentioned spreader assembly.

[0020] The installation equipment comprises a main hoist and an auxiliary hoist, the main hoist is connected with the first hook portion, and the auxiliary hoist is connected with the second hook portion.

[0021] According to a fourth aspect of the present application, there is also provided a kind of installation method of offshore single pile, and the installation method is characterized by being based on the above-mentioned installation equipment, and the installation method comprises:

[0022] Lifting: the main crane lifts the pile head end of the monopile at the first actual lifting position of the monopile, and the auxiliary crane lifts the pile tail end at the second actual lifting position of the monopile.

[0023] Optionally, the installation method further comprises:

[0024] Turning-in: in the process of turning-in, the second hook part is lowered, the first hook part remains stationary, and the monopile rotates around the first actual lifting position.

[0025] Other features of the present specification, and the advantages thereof over existing prior art forms, will become apparent to those skilled in the art upon consideration of the following detailed description of illustrative embodiments thereof exemplifying the best now known mode of putting the present specification into practice. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated in and form a part of the specification, illustrate embodiments of the present specification and, together with the description, serve to explain the principles of the present specification.

[0027] Figure 1 is a flowchart of the first hook part lifting the monopile in the embodiment of the present specification, a first state;

[0028] Figure 2 is a flowchart of the first hook part lifting the monopile in the embodiment of the present specification, a second state;

[0029] Figure 3 is a flowchart of the first hook part lifting the monopile in the embodiment of the present specification, a third state;

[0030] Figure 4 is Figure 3 a sectional view in the vertical direction;

[0031] Figure 5 is a flowchart of the first hook part lifting the monopile in the embodiment of the present specification, a fourth state;

[0032] Figure 6 is a flowchart of the first hook part lifting the monopile in the embodiment of the present specification, a fifth state;

[0033] Figure 7 is Figure 6 a sectional view in the vertical direction;

[0034] Figure 8 is a flowchart of the second hook part lifting the monopile in the embodiment of the present specification, a first state;

[0035] Figure 9 is a flowchart of the second hook part lifting the monopile in the embodiment of the present specification, a second state;

[0036] Figure 10is a flowchart of the process of hoisting the single pile by the second hook part in the embodiment of the present application, the third state;

[0037] Figure 11 is a flowchart of the process of hoisting the single pile by the second hook part in the embodiment of the present application, the fourth state;

[0038] Figure 12 is a flowchart of the process of hoisting the single pile by the second hook part in the embodiment of the present application, the fifth state;

[0039] Figure 13 is a flowchart of the process of hoisting the single pile by the second hook part in the embodiment of the present application, the sixth state;

[0040] Figure 14 is a flowchart of the process of hoisting the single pile by the second hook part in the embodiment of the present application, the seventh state;

[0041] Figure 15 is a flowchart of the process of hoisting the single pile by the second hook part in the embodiment of the present application, the eighth state;

[0042] Figure 16 is a flowchart of the process of turning over the single pile in the embodiment of the present application;

[0043] Figure 17 is a flowchart of the process of hoisting the single pile in the embodiment of the present application.

[0044] Explanation of reference signs:

[0045] 1, single pile; 11, pile head end; 12, pile tail end; 13a, first pile body lifting lug;

[0046] 31, stretching device; A1, first actual hoisting position; A2, second actual hoisting position; A3, initial hoisting position;

[0047] 51, first adjusting rope; 51a, first rope head end; 51b, first rope tail end; 52, second adjusting rope; 52b, second rope tail end; 53, first hoisting rope; 54, third adjusting rope; 54a, hook part; 55, second hoisting rope; 56, first hook part; 57, second hook part; 58, hoisting beam; 58a, beam head end; 58b, beam tail end; 59a, first steel wire rope; 59b, second steel wire rope. DETAILED DESCRIPTION

[0048] In order to make the personnel in the technical field better understand the present application scheme, the present application is further described in detail below in combination with the drawings and specific embodiments.

[0049] According to one embodiment of the present application, reference is made to Figure 1 and Figure 17The spreader assembly in the embodiment is used to connect with the device to be hoisted. The device to be hoisted in the present application can be a beam, a truss or a monopile 1, etc.

[0050] Referring to Figure 1 and Figure 17 The spreader assembly in the present application is used to hoist the monopile 1, which includes a pile head end 11 and a pile tail end 12. The pile head end 11 refers to the upper end of the monopile 1 in the vertical direction during the process of turning over to the vertical state.

[0051] In Figure 5 and Figure 11 , a first actual hoisting position A1 is provided on the side close to the pile head end 11, and a second actual hoisting position A2 is provided on the side close to the pile tail end 12. The first actual hoisting position A1 and the second actual hoisting position A2 refer to the actual positions of the hoisting force applied to the monopile 1 by the crane when hoisting the monopile 1 at the construction site where the monopile 1 is installed.

[0052] The monopile 1 also has an initial hoisting position A3, which can be understood with reference to the background section. The initial hoisting position A3 of each monopile 1 is different, and the monopile 1 has the initial hoisting position A3 when it is shipped. The pile body connecting assembly is provided at the initial hoisting position A3 of the monopile 1. For example, the pile body connecting assembly includes a first pile body lifting lug 13a and a second pile body lifting lug arranged opposite to each other in the radial direction of the monopile 1.

[0053] The first actual hoisting position A1 and the second actual hoisting position A2 are spaced apart from the initial hoisting position A3. The first actual hoisting position A1 can be closer to the center of gravity of the monopile 1, or the initial hoisting position A3 can be closer to the center of gravity of the monopile 1.

[0054] In some embodiments of the present application, the crane hoists the monopile 1 through the spreader assembly. The spreader assembly includes a first hook portion 56 and an adjusting assembly. For example, referring to Figure 1 and Figure 2 , the adjusting assembly includes an adjusting rope set and a first hoisting rope 53 connected with the first hook portion 56. The adjusting rope set in the present embodiment includes a first adjusting rope 51 and a second adjusting rope 52 extending in the axial direction of the monopile 1. The lengths of the first adjusting rope 51 and the second adjusting rope 52 are equal. The length of the first hoisting rope 53 can be greater than the lengths of the first adjusting rope 51 and the second adjusting rope 52, or less than the length of the first adjusting rope 51 or the second adjusting rope 52.

[0055] Specifically, as shown in Figure 3 and Figure 4 , the first adjusting rope 51 includes a first rope head end 51a and a first rope tail end 51b, and the second adjusting rope 52 includes a second rope head end and a second rope tail end 52b arranged opposite to each other.

[0056] In Figure 2 , Figure 4 , Figure 11 and Figure 17 , the first rope head end 51a is connected to the first pile body lifting lug 13a, and the second rope head end is connected to the second pile body lifting lug. For example, in Figure 2 , the first adjusting rope 51 and the second adjusting rope 52 can be hoisted by using the auxiliary crane 561, and then the first rope head end 51a and the second rope head end are connected to the first pile body lifting lug 13a and the second pile body lifting lug, respectively.

[0057] After the first hoisting rope 53 is arranged along the circumference of the monopile 1, it is sequentially threaded through the first rope tail end 51b and the second rope tail end 52b to be connected with the first adjusting rope 51 and the second adjusting rope 52, as shown in Figure 5 , the first adjusting rope 51 and the second adjusting rope 52 extend to the first actual hoisting position A1 to form a cross with the first hoisting rope 53, and the position where the first adjusting rope 51, the second adjusting rope 52 and the first hoisting rope 53 are cross-connected is located at the first actual hoisting position A1.

[0058] When the monopile 1 is in a horizontal transverse state, since the first hoisting rope 53 is arranged along the circumference of the monopile 1 on the outer wall of the monopile 1, the first hook portion 56 can exert a vertical upward lifting force on the monopile 1 through the first hoisting rope 53, and therefore the first actual hoisting position A1 where the first hoisting rope 53 is located is the position where the first hook portion 56 actually exerts the lifting force on the monopile 1.

[0059] During the process of turning over of the monopile 1, in combination with the contents shown in Figure 6 and Figure 16 , the direction of the gravity P of the monopile 1 is always vertically downward, and as the monopile 1 is in the process of turning over, the angle α between the extension direction of the axis L1 of the monopile 1 and the gravity P of the monopile 1 gradually decreases until α = 0°, at which time the monopile 1 is in a vertical state.

[0060] During the process of turning over, the first adjusting rope 51 and the second adjusting rope 52 exert a pulling force on the first hoisting rope 53 in the axial direction through the first pile body lifting lug 13a and the second pile body lifting lug, and the position where the first adjusting rope 51 and the second adjusting rope 52 exert the pulling force on the first hoisting rope 53 is located at the position where the first adjusting rope 51 and the second adjusting rope 52 are cross-connected with the first hoisting rope 53, and since the position where the first rope tail end 51b and the second rope tail end 52b are cross-connected with the first hoisting rope 53 is located at the first actual hoisting position A1, the first hook portion 56 still exerts the pulling force on the monopile 1 through the first actual hoisting position A1.

[0061] Therefore, the first hook part 56 applies the lifting force to the single pile 1 through the first actual lifting position A1 in the process of lifting the single pile 1 and the process of turning over the single pile 1, instead of applying the lifting force to the single pile 1 through the initial lifting position A3 of the single pile 1. Therefore, the technical scheme in the present application transfers the lifting position of the single pile 1 from the initial lifting position A3 to the first actual lifting position A1 through the first adjusting rope 51, the second adjusting rope 52 and the first lifting rope 53, so that the crane can lift the single piles 1 with different initial lifting positions A3 through cooperation with the lifting appliance assembly, thereby increasing the adaptability of the crane.

[0062] In one embodiment, referring to Figure 5 and Figure 6 , the lifting appliance assembly further comprises a stretching device, which can be a winch or a hand-operated hoist.

[0063] The winch is taken as an example for illustration. One end of the connecting steel wire rope 31a of the winch is fixed to the single pile 1, and the other end is connected to the first rope tail end 51b and the second rope tail end 52b. The connecting steel wire rope 31a of the winch is wound, and the first adjusting rope 51 and the second adjusting rope 52 are straightened to the first actual lifting position A1. Therefore, the first lifting rope 53 can be conveniently connected to the first rope tail end 51b and the second rope tail end 52b at the first actual lifting position A1.

[0064] In one specific example, the specific process of arranging the first hook part 56 of the lifting appliance assembly and the adjusting assembly is described in combination with Figures 1-7 .

[0065] Referring to Figure 1 , in the process of arranging the lifting appliance assembly on the single pile, the first hook part 56 and the first lifting rope 53 are arranged to the preset arrangement position of the lifting appliance assembly.

[0066] Referring to Figure 2 , after the first adjusting rope 51 and the second adjusting rope 52 are lifted by the auxiliary crane 561, the first rope head end 51a is connected to the first pile body lifting lug 13a, and the second rope head end is connected to the second pile body lifting lug.

[0067] For example, Figure 1 , the first hook part 56 comprises a hook body and a lifting beam 58. The lifting beam 58 comprises a beam head end 58a and a beam tail end 58b. One end of the first lifting rope 53 is connected to the beam head end 58a, and the other end of the first lifting rope 53 is connected to the beam tail end 58b.

[0068] As shown in Figure 3 and Figure 4As shown, one end of the first lifting rope 53 is connected to the beam head end 58a of the hoisting beam 58, and the other end is connected to the beam tail end 58b of the hoisting beam 58 by passing through the first rope tail end 51b and the second rope tail end 52b in sequence.

[0069] As shown in Figure 5 , the first adjusting rope 51 and the second adjusting rope 52 are pulled straight to the first actual lifting position A1 by using the winch. As shown in Figure 6 and Figure 7 , the first hook part 56 applies a lifting force in the vertical direction to pull the first lifting rope 53 straight in the vertical direction to lift the monopile 1.

[0070] In one example, as shown in Figure 1 , the first steel wire rope 59a and the second steel wire rope 59b are connected to the beam head end 58a and the beam tail end 58b of the hoisting beam 58 respectively, and the shackles are connected to the first steel wire rope 59a and the second steel wire rope 59b. Alternatively, in order to facilitate connection, the first steel wire rope 59a and the second steel wire rope 59b are not provided, and the two ends of the first lifting rope 53 are directly connected to the two ends of the hoisting beam 58.

[0071] In some embodiments, the second hook part 57 and the second lifting rope 55 connected and matched with the second hook part 57 are arranged at the second actual lifting position A2 of the monopile 1, and the two ends of the second lifting rope 55 are connected to the second hook part 57 to form a closed loop, and the loop-shaped second lifting rope 55 is sleeved on the second actual lifting position A2 of the monopile 1. The second hook part 57 applies a lifting force to the second actual lifting position A2 through the second lifting rope 55.

[0072] In order to make the force of the monopile 1 more uniform during lifting, the second actual lifting position A2 can change according to the change of the first actual lifting position A1, and the first actual lifting position A1 and the second actual lifting position A2 are symmetrically arranged relative to the center of gravity of the monopile 1.

[0073] In this way, when the first hook part 56 and the second hook part 57 horizontally lift and move the monopile 1, the positions where the first hook part 56 and the second hook part 57 apply the lifting force are symmetrically arranged relative to the center of gravity, thereby balancing the distribution of the lifting force of the first hook part 56 and the second hook part 57, and avoiding the unbalanced distribution of the lifting force of the first hook part 56 and the second hook part 57 due to the eccentricity of the positions where the lifting force is applied.

[0074] For example, as shown in Figure 9 , the hoist assembly further comprises a third adjusting rope 54, one end of the third adjusting rope 54 is connected to the second hook part 57, and the other end of the third adjusting rope 54 is provided with a hook 54a for hooking the pile tail end 12.

[0075] Thus, in the process of turning over the single pile 1, the hook member 54a is used to apply the lifting force to the pile tail end 12, so as to ensure that the lifting force applied to the single pile 1 by the second hook portion 57 during the pile turning over process is evenly distributed with the lifting force of the first hook portion 56.

[0076] The following will be described in combination with Figures 8-15 the way in which the second hook portion 57 is connected to the single pile 1.

[0077] As Figure 8 shown, the two ends of the second lifting rope 55 are connected to the second hook portion 57 through shackles, and one end of the third adjusting rope 54 is also connected to the second hook portion 57 through a shackle. The end of the third adjusting rope 54 having the hook member 54a is in a free state.

[0078] Referring to Figure 9 , the second hook portion 57 is lowered, and the hook member 54a is hooked to the pile tail end 12 of the single pile 1. Then, as Figure 10 shown, the second hook portion 57 is continuously lowered, and the annular second lifting rope 55 is sleeved outside the single pile 1. Referring to Figure 11 , the second lifting rope 55 moves along the axial direction of the single pile 1 under the action of the second hook portion 57, and pulls the third adjusting rope 54 to the second actual lifting position A2. The length of the third adjusting rope 54 can be selected according to the distance between the second actual lifting position A2 and the pile tail end 12. Then, the second hook portion 57 is raised in the vertical direction to pull the second lifting rope 55 straight, and the lifting force is applied to the second actual lifting position A2 through the second lifting rope 55.

[0079] Under the joint action of the first hook portion 56 and the second hook portion 57, the single pile 1 in the horizontally placed state can be lifted and moved. When the single pile 1 is moved to the set pile lowering site, in combination with Figure 16 the comparative reference Figure 12 , Figure 13 , Figure 14 and Figure 15 , in the process of turning over the pile, the second hook portion 57 is gradually lowered, and at this time, the second hook portion 57 applies the lifting force to the single pile 1 through the second lifting rope 55 and the third adjusting rope 54, and the first hook portion 56 remains stationary. With the lowering of the second hook portion 57, the single pile 1 rotates to the vertical state around the first actual lifting position A1 under the action of gravity. After the single pile 1 is in the vertical position, the second lifting rope 55 and the third adjusting rope 54 are removed from the single pile 1.

[0080] In some embodiments, a kind of installation equipment of offshore wind power device is provided, and the installation equipment includes the spreader assembly and the single pile 1 described above, and the single pile 1 is used to support the offshore wind power device.The single pile 1 is connected with the air bag assembly 6, and the single pile 1 is provided with the first pile body lifting lug 13a and the second pile body lifting lug, which are located at the initial lifting position A3, the first rope head 51a is connected to the first pile body lifting lug 13a, and the second rope head 52a is connected to the second pile body lifting lug.

[0081] The installation equipment further includes the main crane and the auxiliary crane, and the main crane is connected with the first hook part 56, and the auxiliary crane is connected with the second hook part 57.

[0082] The offshore wind power installation equipment provided by the scheme can gradually replace the lifting force of the second hook part 57 on the single pile 1 with the buoyancy of the air bag assembly 6 on the single pile 1 in the process of turning over and gradually entering the water of the single pile 1 when the single pile 1 is installed, so as to prevent the lifting weight of the main crane from not meeting the condition of lifting the single pile 1 with large weight, and further enable the main crane with small lifting weight to install the single pile 1 with weight larger than the rated lifting weight, so as to significantly reduce the installation cost of the single pile 1 with large weight, and improve the convenience and economy of the installation of the single pile 1 with large weight.In addition, the adaptability of the installation equipment is further improved by the spreader assembly in the scheme, so that the installation equipment can lift various single piles 1.

[0083] In some embodiments, based on the installation equipment described above, a kind of installation method of offshore single pile 1 is further provided, and the method includes:

[0084] Step one, lifting: the main crane lifts the single pile 1 at the first actual lifting position A1 of the single pile 1 through the adjusting assembly.

[0085] A1 lifts the pile head 11, and the auxiliary crane lifts the pile tail 12 at the second actual lifting position A2 of the single pile 1 through the second lifting rope 55.

[0086] Step two, turning over and entering water: in the process of turning over and entering water, the second hook part 57 is lowered, the first hook part 56 remains unchanged, and the single pile 1 rotates around the first actual lifting position A1.

[0087] The principles and implementation modes of the present application are described by applying specific examples in this paper, and the above examples are only used to help understand the method and core idea of the present application.It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A lifting device assembly for lifting a device to be lifted, the device having an initial lifting position and a first actual lifting position, the first actual lifting position being axially spaced from the initial lifting position, characterized in that... The lifting device assembly includes a first hook and an adjusting assembly, the adjusting assembly comprising: The first lifting rope (53) has the first hook connected to the first lifting rope (53); An adjusting rope assembly includes at least two adjusting ropes, each of which has a head end and a tail end. The head end of each adjusting rope is connected to the initial lifting position of the device to be lifted, and the tail end of each adjusting rope is located at the first actual lifting position and is connected to the first lifting rope (53). The first lifting rope (53) is wound around the outer wall of the single pile along the circumference of the single pile, and the first hook (56) can apply a vertically upward lifting force to the single pile through the first lifting rope (53). The first lifting rope (53) is provided with a connecting ring at the end of the rope. The first lifting rope (53) passes through the connecting ring of all the adjusting rope groups. The lifting rope is wrapped around the outer wall of the device to be lifted in the circumferential direction. Both ends of the first lifting rope (53) are connected to the first hook. The device to be lifted also includes a second actual lifting position, wherein the first actual lifting position and the second actual lifting position are symmetrically arranged with respect to the center of gravity of the device to be lifted; The lifting device assembly also includes a second hook (57) and a second lifting rope (55). Both ends of the second lifting rope (55) are connected to the second hook (57) to form a closed loop. The looped second lifting rope (55) is fitted onto the second actual lifting position of the single pile. The second hook (57) applies a lifting force to the second actual lifting position through the second lifting rope (55). It also includes a third adjusting rope (54), one end of which is connected to the second hook (57), and the other end is provided with a hook (54a) for hooking the device to be lifted.

2. The lifting device assembly according to claim 1, characterized in that, It also includes a tensioning device (31), one end of which is fixed to the lifting device and the other end is connected to the end of the adjusting rope group located at the first actual lifting position. Under the action of the tensioning device (31), the adjusting rope group is in a straight state.

3. The lifting device assembly according to claim 1, characterized in that, The first hook part includes a hook body and a lifting beam (58). The lifting beam (58) includes a beam head end (58a) and a beam tail end (58b). One end of the first lifting rope (53) is connected to the beam head end (58a), and the other end of the lifting rope is connected to the beam tail end (58b).

4. An installation device for an offshore wind power system, characterized in that, include: The lifting device assembly according to any one of claims 1-3; The single pile (1) is a device to be lifted. The single pile (1) is used to support the offshore wind power device. The single pile (1) is connected to the airbag assembly. The single pile (1) is provided with a first pile body lifting lug (13a) and a second pile body lifting lug. The first pile body lifting lug (13a) and the second pile body lifting lug are located at the initial lifting position. The adjusting rope group includes a first adjusting rope (51) and a second adjusting rope (52). The first adjusting rope (51) is connected to the first pile body lifting lug (13a), and the second adjusting rope (52) is connected to the second pile body lifting lug.

5. An installation device for an offshore wind power system, characterized in that, include: The lifting device assembly according to any one of claims 1-3; The installation equipment includes a main crane and an auxiliary crane. The main crane is connected to the first hook (56), and the auxiliary crane is connected to the second hook (57).

6. A method for installing a marine monopile, characterized in that, Based on the installation equipment according to claim 5, the installation method includes: Lifting: The main crane lifts the pile head end (11) of the single pile (1) at the first actual lifting position of the single pile (1), and the auxiliary crane lifts the pile tail end (12) at the second actual lifting position of the single pile (1).

7. The installation method according to claim 6, characterized in that, Also includes: Piling into water: During the process of turning the pile into water, the second hook (57) is lowered, the first hook (56) remains stationary, and the single pile (1) rotates around the first actual lifting position.

Images