A hoisting method for the horizontal guy wire of an offshore floating wind turbine

Abstract

The present invention discloses a hoisting method for a horizontal cable of an offshore floating wind turbine. The specific steps are as follows: S1. Completely unfold the horizontal cable; S2. Connect the first hoisting device to a tensioning end of the horizontal cable, and connect the second hoisting device to the midpoint of the horizontal cable. Hoist this tensioning end to an anchor point of the wind turbine through the first hoisting device; S3. Pass this tensioning end through the anchor hole of the anchor point by means of a traction device; S4. Install a jack at the end of the tensioning end; S5. Hoist the other tensioning end of the horizontal cable to another anchor point of the wind turbine through the first hoisting device, connect the traction device and tow it into the anchor hole of the other anchor point, and install a jack at its end; S6. Use the jacks at the two tensioning ends to tension the two tensioning ends in place and install a tensioning device; S7. Tension and fix the horizontal cable through the tensioning device. The present invention can effectively solve the problem of difficult hoisting of the horizontal cable of an offshore floating wind turbine.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore floating wind turbines, and in particular to a hoisting method for a horizontal cable of an offshore floating wind turbine. Background Art

[0002] A dual-rotor offshore floating wind turbine includes a floating wind turbine foundation, a Y-shaped tower, and two nacelles. The bottom end of the Y-shaped tower is fixed at the center of the floating wind turbine foundation, and the two nacelles are respectively installed at the two top ends of the Y-shaped tower. At the same time, a horizontal cable is connected between the adapters of the two nacelles to ensure the stability of the tower. Due to the large self-weight of the horizontal cable, about 15T per single cable, the distance between the two end anchor points is far, about 180m, and the positions of the two end anchor points are too high, both about 120m above the ground. At the same time, since the horizontal cable is installed on the water during installation, there is no space and conditions to build a catwalk or construction platform in the up and down positions, and the anchor point is the nacelle adapter with limited space, so a large winch cannot be used to provide enough traction to pull the cable in place, resulting in very difficult cable hoisting. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a hoisting method for a horizontal cable of an offshore floating wind turbine, which can effectively solve the problem of difficult hoisting of the horizontal cable of an offshore floating wind turbine.

[0004] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0005] A hoisting method for a horizontal cable of an offshore floating wind turbine, which method requires the following equipment: a towing trolley, a lifting device, a traction device, a jack, and a tensioning device. The specific steps are as follows:

[0006] S1. Completely unfold the horizontal cable near the preset lifting point and place it on the towing trolley;

[0007] S2. The lifting device includes a first lifting device and a second lifting device. Connect the first lifting device to one tensioning end of the horizontal cable, and connect the second lifting device to the midpoint position of the horizontal cable. Lift the tensioning end of the horizontal cable to the anchor point of one nacelle adapter on the Y-shaped tower of the wind turbine through the first lifting device, and lift the midpoint of the horizontal cable to a preset position lower than the anchor point through the second lifting device;

[0008] S3. Arrange the traction device at the anchor point, connect the tensioning end of the horizontal cable lifted to the anchor point to the traction device, and pull the tensioning end of the horizontal cable into the anchor hole of the anchor point through the traction device;

[0009] S4. After the tensioning end is pulled into the anchor hole, install a jack at its end;

[0010] S5. Move the first hoisting device to the other tensioning end of the horizontal cable. Lift the other tensioning end of the horizontal cable to the anchor point of the other nacelle adapter on the Y-shaped tower through the first hoisting device. At the same time, lift the midpoint of the horizontal cable to a position at the same height as the anchor point through the second hoisting device. According to steps S3 to S4, pull the other tensioning end of the horizontal cable into the anchor hole of the anchor point of the other nacelle adapter, and install a jack at its end.

[0011] S6. Use the jacks at the two tensioning ends to tension the two tensioning ends in place, and then install the tensioning device.

[0012] S7. Remove the first hoisting device, the second hoisting device and the traction device. Tension and fix the horizontal cable through the tensioning device according to the conventional operation, and remove the jacks to complete the hoisting of the horizontal cable.

[0013] Furthermore, both the first hoisting device and the second hoisting device include a crawler crane, a sling and a hoop. The hook of the crawler crane is connected to the sling, and the sling is connected to the horizontal cable through the hoop.

[0014] Furthermore, the traction device includes a winch, a traction rod and a steel wire rope. The winch is arranged on the internal platform of the nacelle adapter, and is connected to the traction rod through the steel wire rope. The traction rod is connected to the horizontal cable.

[0015] Furthermore, the traction rod adopts a segmented threaded connection structure. During traction, each segmented traction rod is pulled through the jack, and then this segmented traction rod is removed. The remaining segmented traction rods are operated in the same way until the anchor of the horizontal cable is installed in place.

[0016] Furthermore, a rubber pad is laid between the towing cable trolley and the horizontal cable.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] 1. The method of the present invention is simple to operate. Using two crawler cranes to hoist the cable can avoid directly using the winch at the anchor point to pull the tensioning end of the horizontal cable from the ground directly to the anchor point, reduce the specification of the winch, and effectively utilize the space inside the nacelle adapter.

[0019] 2. The method of the present invention adds a traction rod at the tensioning end of the horizontal cable, which is equivalent to lengthening the length of the cable. The traction force can be reduced from more than 60T to 16T, greatly reducing the hoisting difficulty of the horizontal cable. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of step S1 in the method of the present invention.

[0021] Figure 2Schematic diagram of step S2 in the method of the present invention.

[0022] Figure 3 Schematic diagram of step S3 in the method of the present invention.

[0023] Figure 4 Schematic diagram of step S4 in the method of the present invention.

[0024] Figure 5 Schematic diagram of step S5 in the method of the present invention.

[0025] Figure 6 Schematic diagram of the connection between the lifting device and the horizontal cable in the method of the present invention.

[0026] Figure 7 Schematic diagram of the structure of the towing bar in the method of the present invention.

[0027] Figure 8 Schematic diagram of laying a rubber pad between the cable trolley and the horizontal cable in the method of the present invention. Detailed implementation manners

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] This embodiment provides a hoisting method for the horizontal cable of an offshore floating wind turbine. The method requires the configuration of: a cable trolley 2, a lifting device, a traction device 7, a jack 8, and a tensioning device (not shown in the figure). The specific steps are as follows.

[0030] S1. As Figure 1 shown, fully unfold the horizontal cable 1 near the preset lifting point and place it on the cable trolley 2 to facilitate the movement of the horizontal cable 1 during hoisting and avoid friction between the horizontal cable 1 and the ground.

[0031] S2. As Figure 2 shown, the lifting device includes a first lifting device 3 and a second lifting device 4. Connect the first lifting device 3 to a tensioning end 101 of the horizontal cable 1, and connect the second lifting device 4 to the midpoint position of the horizontal cable 1. Lift the tensioning end 101 of the horizontal cable 1 to an anchor point 5 of one of the nacelle adapters on the Y-shaped tower of the wind turbine through the first lifting device 3, and lift the midpoint of the horizontal cable 1 to a preset position lower than the anchor point 5 through the second lifting device 4. The second lifting device 4 can effectively reduce the hanging length and bending radius of the horizontal cable 1.

[0032] S3. As shown in Figure 3 , at the anchor point 5 (on the inner platform 9 of the corresponding nacelle adapter), a traction device 7 is arranged. The traction device 7 includes a winch 701, a traction rod 702 and a steel wire rope 703. The winch 701 is connected to the traction rod 702 through the steel wire rope 703. The traction rod 702 is connected to the tensioning end 101. The tensioning end 101 of the horizontal cable 1 is pulled into the anchor hole of the anchor point 5 through the traction device 7.

[0033] S4. As shown in Figure 4 , after the tensioning end 101 is pulled into the anchor hole, a jack 8 is installed at its end. The support feet 801 of the jack 8 are abutted against the inner wall of the nacelle adapter. After the other tensioning end of the horizontal cable 1 is pulled in place, the subsequent pulling is completed with the jack 8.

[0034] S5. As shown in Figure 5 , move the first lifting device 3 to the other tensioning end 102 of the horizontal cable 1. Lift the other tensioning end 102 of the horizontal cable 1 to the anchor point 6 of another nacelle adapter on the Y-shaped tower through the first lifting device 3. At the same time, lift the midpoint of the horizontal cable 1 to a position equal in height to the anchor point 5 and the anchor point 6 through the second lifting device 4. Then, according to steps S3 to S4, pull the other tensioning end 102 of the horizontal cable 1 into the anchor hole of the anchor point 6, and install a jack 8 at its end.

[0035] S6. Use the jacks 8 at the two tensioning ends to tension the two tensioning ends in place, and then install the tensioning device.

[0036] S7. Remove the first lifting device 3, the second lifting device 4 and the traction device 7. Tension and fix the horizontal cable 1 through the tensioning device according to the conventional operation. Remove the jack 8 to complete the hoisting of the horizontal cable 1.

[0037] As shown in Figure 6 , both the first lifting device 3 and the second lifting device 4 include an 800T crawler crane, a sling and a hoop. The hook 301 of the crawler crane is connected to the sling 302. The sling 302 is connected to the horizontal cable 1 through the hoop 303. The hoop is customized according to the horizontal cable 1. The position is fixed when hoisting the cable through the hoop, and the coating on the surface of the cable body is prevented from being damaged.

[0038] As shown in Figure 7 , the traction rod 702 adopts a segmented threaded connection structure. According to the spatial design length of the nacelle adapter, when pulling, each segment of the segmented traction rod 7021 is pulled through the jack 8, and then the segment of the segmented traction rod 7021 is manually removed. The remaining segmented traction rods are operated in the same way until the anchor 103 of the horizontal cable 1 is installed in place.

[0039] As Figure 8 shown, the towing cable trolley 2 is customized according to the parameters of the horizontal cable 1. On the premise of meeting the load, the weight is minimized as much as possible. Ordinary rollers 11 are adopted, and rubber pads 10 are added between the horizontal cable 1 and the towing cable trolley 2 to avoid friction.

[0040] The above is only a preferred embodiment of the present invention for patent, but the protection scope of the present invention for patent is not limited thereto. Any person skilled in the art within the scope disclosed by the present invention for patent, according to the technical solution of the present invention for patent and its inventive concept, makes equivalent substitutions or changes, and all belong to the protection scope of the present invention for patent.

Claims

1. A hoisting method for the horizontal cable of an offshore floating wind turbine, characterized in that, this method requires the following configurations: a towing cable trolley, a hoisting device, a traction device, a jack and a tensioning device. The specific steps are as follows. S1. Completely unfold the horizontal cable near the preset hoisting point and place it on the towing cable trolley; S2. The hoisting device includes a first hoisting device and a second hoisting device. Connect the first hoisting device to one tensioning end of the horizontal cable, and connect the second hoisting device to the midpoint position of the horizontal cable. Lift the tensioning end of the horizontal cable to the anchor point of one of the nacelle adapters on the Y-shaped tower of the wind turbine through the first hoisting device, and lift the midpoint of the horizontal cable to a preset position lower than the anchor point through the second hoisting device; S3. Arrange the traction device at the anchor point, connect the tensioning end of the horizontal cable hoisted to the anchor point to the traction device, and pull the tensioning end of the horizontal cable into the anchor hole of the anchor point through the traction device; S4. After the tensioning end is pulled into the anchor hole, install a jack at its end; S5. Move the first hoisting device to the other tensioning end of the horizontal cable, lift the other tensioning end of the horizontal cable to the anchor point of the other nacelle adapter on the Y-shaped tower through the first hoisting device, and at the same time lift the midpoint of the horizontal cable to a position level with the anchor point through the second hoisting device. According to steps S3 to S4, pull the other tensioning end of the horizontal cable into the anchor hole of the anchor point of the other nacelle adapter, and install a jack at its end; S6. Use the jacks at the two tensioning ends to tension the two tensioning ends in place, and then install the tensioning device; S7. Remove the first hoisting device, the second hoisting device and the traction device, tension and fix the horizontal cable through the tensioning device according to the conventional operation, remove the jacks, and complete the hoisting of the horizontal cable.

2. The hoisting method for the horizontal cable of an offshore floating wind turbine according to claim 1, characterized in that, both the first hoisting device and the second hoisting device include a crawler crane, a sling and a hoop. The hook of the crawler crane is connected to the sling, and the sling is connected to the horizontal cable through the hoop.

3. The hoisting method for the horizontal cable of an offshore floating wind turbine according to claim 1, characterized in that, the traction device includes a winch, a traction rod and a steel wire rope. The winch is arranged on the internal platform of the nacelle adapter. It is connected to the traction rod through the steel wire rope, and the traction rod is connected to the horizontal cable.

4. The hoisting method for the horizontal cable of an offshore floating wind turbine according to claim 3, characterized in that, the traction rod adopts a segmented threaded connection structure. When towing, pull each segmented traction rod through the jack, then remove this segmented traction rod, and operate the remaining segmented traction rods in the same way until the anchor of the horizontal cable is installed in place.

5. The hoisting method for the horizontal cable of an offshore floating wind turbine according to claim 1, characterized in that, a rubber pad is laid between the towing cable trolley and the horizontal cable.

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