A hoisting construction method for a hoist of a jacket of an offshore wind power

Abstract

This invention discloses a method for lifting and installing a lifting sling for offshore wind turbine jackets. The method includes installing a level on the lifting sling and marking matching scale lines for visual monitoring. A double-ended adjusting screw for auxiliary sling adjustment and a pressure sensor for monitoring the sling tension at the lifting points are also installed on the lifting sling. Based on monitoring results of the lifting sling's horizontal state when it is on the ground, after adjustment using the double-ended adjusting screw, and before lifting completely off the ground, the auxiliary sling connected to the double-ended adjusting screw and the load-bearing slings at the lifting points are adjusted to ensure the lifting sling is ultimately level and that the tension of each load-bearing sling is uniform. This invention achieves precise leveling of the lifting sling through technologies such as a laser level, double-ended adjusting screw for auxiliary sling adjustment, and pressure sensors, avoiding the tedious work of manual level measurement, reducing costs, effectively preventing damage to the lifted object during the lifting process, and improving construction quality and efficiency.

Description

Technical Field

[0001] This invention belongs to the field of offshore wind power technology, and in particular relates to a method for hoisting and installing a lifting device for offshore wind turbine jackets. Background Technology

[0002] In lifting operations, the lifting sling or wire rope is typically used to suspend the lifting equipment from the hook on the lifting machinery. Since the lifting sling is directly connected to the load being lifted, ensuring its balance is crucial. Imbalance can lead to uneven stress on the slings, accelerating wear and shortening their lifespan. Furthermore, imbalance can cause the hook and the load to tilt, increasing uncertainty and risk during lifting. For example, it may damage or deform the load, affecting its performance and safety, and posing a risk of serious quality accidents. Simultaneously, imbalance affects lifting accuracy; reduced accuracy will prevent the load from being accurately placed, impacting operational efficiency.

[0003] In existing technologies, one method of leveling the lifting device is to increase the counterweight by using a balance beam or counterweight blocks. However, different objects require different counterweights, resulting in numerous tools, high labor intensity, easy errors, and safety hazards. Another method of leveling the lifting device relies on skilled workers to make adjustments based on experience. However, the reliability and consistency of this method are difficult to guarantee. It is highly dependent on manual labor and has uncontrollable human factors, which in turn affect the quality.

[0004] When the object being lifted has a complex shape and is heavy, multi-point lifting is required, as the load needs to be distributed across multiple lifting points. Current technologies typically use turnbuckles or hand-operated hoists to control and adjust the force on each lifting point. However, these methods often require manual control and can only qualitatively ensure that each sling is under load, not determine the actual force on each sling. Furthermore, in current technologies, turnbuckles are often installed on all load-bearing slings. Considering that turnbuckles are only suitable for lighter objects, exceeding the structural bearing capacity of the turnbuckles when the object being lifted poses a safety risk during construction.

[0005] Offshore wind turbine jacket foundations are complex and heavy objects, often weighing over 1000 tons. Because commonly used turnbuckles have insufficient load-bearing capacity, they are not used for leveling during the lifting process. Double-ended adjusting screws are a type of turnbuckle. During jacket foundation lifting, tripod lifting equipment is commonly used. This equipment typically consists of three supporting beams forming a triangular structure. However, ordinary lifting equipment lacks automatic leveling capabilities, which can affect the connection between the lifting equipment and the jacket foundation. This is especially problematic since jacket foundations are often over 70 meters high, requiring high-altitude work for connection. Therefore, various automated lifting equipment is now being used at current lifting sites for connection between the equipment and the jacket. Automated connection necessitates ensuring the lifting equipment is level. Furthermore, due to the gravity of the jacket foundation itself and the different tensile forces exerted by the slings at different lifting points on the jacket foundation, the balance of the lifting equipment cannot be adjusted in one go. It requires repeated manual measurement and adjustment of the current level of the lifting equipment, resulting in low efficiency in leveling the lifting equipment. Moreover, during the manual adjustment of the slings, the operator often judges the load-bearing capacity of the slings based on their experience and the tension of the slings. However, in actual lifting, uneven stress on the slings can affect the slings, the lifting equipment, and the lifted object.

[0006] The existing Chinese utility model application document with announcement number CN214733759U discloses a lifting device for a three-pile suction cylinder guide frame, "including a central body, first to third lower support beams, a connecting beam, first and second upper beams, two upper lifting forks, three shaft inserters, and two lifting hooks. Three flange panels are evenly distributed on the outer side of the central body; the first to third lower support beams are each connected to the three flange panels of the central body, and a hanging shaft is connected to the bottom surface of the outer end of each lower support beam; the first upper beam is installed on the top surface of the first lower support beam through the connecting beam." The upper beam is installed on the top surface of the second and third lower support beams; two upper lifting forks are hinged between the two ends of the first and second upper beams, and each upper lifting fork has an upper lifting shaft at both ends; three shaft guides are installed on three pairs of lugs on the jacket foundation; two hooks are installed on the crane vessel; the lower sling is connected between the sling shaft and the shaft guides; the upper sling is connected between the hooks and the upper lifting shafts. Although this lifting device is a tripod beam type lifting device for offshore wind turbine jacket foundations, it still does not provide a method for adjusting the level of the lifting device. Summary of the Invention

[0007] To address the problems existing in the prior art, the present invention aims to provide a method for lifting and installing a lifting device for offshore wind turbine jackets. This invention utilizes technologies such as a laser level and scale lines, a detachable leveling auxiliary mechanism with a double-headed adjusting screw adjusting auxiliary sling, and a pressure sensor to achieve precise leveling of the lifting device. This avoids the tedious work of manual level measurement, reduces costs, effectively prevents damage to the lifted object during the lifting process, and improves construction quality and efficiency.

[0008] To achieve the above and other related objectives, the present invention adopts the following technical solution:

[0009] This invention provides a method for hoisting a lifting device for offshore wind turbine jacket structures. The lifting device includes a geometrically symmetrical lifting beam and at least three lifting points evenly distributed on the device. These lifting points are used to connect load-bearing slings. The method includes the following steps:

[0010] S1. Install a laser level on the lifting device for real-time visual monitoring of the device's horizontal status, and mark scale lines on the upper surface of the lifting beam for visual monitoring by the level:

[0011] The scale lines are radially distributed with the center of the hanging beam as the center. The scale intervals on the scale lines are equal. The laser level is installed at the center of the hanging beam and is adjusted to keep the laser level horizontal and to allow the laser of the laser level to be simultaneously projected onto the scale lines drawn on the hanging beam.

[0012] S2. Place the lifting equipment on the ground and visually check its current levelness using a laser level.

[0013] S3. Install a detachable leveling auxiliary mechanism on the lifting device:

[0014] The detachable leveling auxiliary mechanism includes a double-headed adjusting screw for assisting the connection of the sling to the hook and a pressure sensor for monitoring the tension of the sling at the lifting point;

[0015] One end of the double-headed adjusting screw is hinged to the lifting device, and the other end of the double-headed adjusting screw is suspended on the hook by an auxiliary lifting strap. There are at least two double-headed adjusting screws, and the angle between the hinge point of the two double-headed adjusting screws and the center of the lifting beam is an obtuse angle.

[0016] The pressure sensor is installed at the lifting point of the lifting device;

[0017] S4. Based on the visual results of S2, use the double-headed adjusting screw and auxiliary sling to adjust the lifting device to a preliminary level, and mark the position of the bolt inside the double-headed adjusting screw on the double-headed adjusting screw as the reference position when the lifting device is level.

[0018] S5. Adjust the length of the auxiliary slings by loosening the double-ended adjusting screw, so that the load-bearing slings are suspended on the hook in sequence. The pressure sensor monitors to ensure that all load-bearing slings are unloaded at this time. Then tighten the double-ended adjusting screw and adjust the bolt inside the double-ended adjusting screw to the marked position of the horizontal reference position of the lifting device.

[0019] S6. Lift the lifting device until it is completely off the ground. Loosen the double-ended adjusting screw to gradually apply force to the load-bearing slings. Adjust the position of the load-bearing slings based on the monitoring data of the pressure sensor. At the same time, adjust the stacking order of the load-bearing slings based on the visual results of the laser level until the lifting device is level and the tension of each load-bearing sling is the same.

[0020] S7. Remove the level and store it for later use. Lift the spreader and move it to the top of the jacket frame, ensuring the lifting posture and orientation angle of the spreader, so as to realize the automated connection between the spreader and the jacket frame.

[0021] S8. After the guide frame is hoisted into place using a lifting device, move the lifting device to the recycling location and dismantle and store the detachable leveling auxiliary mechanism for future use.

[0022] As a preferred technical solution, in step S2, the specific steps of visually checking the current level of the lifting device using a laser level include: observing the position of the laser beam irradiated by the laser level on the lifting beam, and judging the current level of the lifting device by whether the laser falls on the same scale line. If there are different scale positions, the lifting device needs to be replaced or adjusted in step S4 to make the lifting device maintain a preliminary level.

[0023] As a preferred technical solution, in step S3, anchor holes are opened on the lifting beam, and guy ropes for wind protection and to prevent the slings from getting tangled are installed on the anchor holes.

[0024] As a preferred technical solution, in step S3, the detachable leveling auxiliary mechanism further includes a wireless signal transmitter and a display. The pressure sensor is connected to the wireless signal transmitter, and the signal transmitter is connected to the operator's display via a signal connection, so that the sling tension data signal collected by the pressure sensor can be transmitted to the display for monitoring in real time.

[0025] As a preferred technical solution, when the lifting device is provided with a pair of lifting points, the pressure sensor can be a pin-type sensor.

[0026] As described above, the present invention has the following beneficial effects:

[0027] (1) The present invention provides a method for lifting and installing a lifting device for offshore wind power jackets. By installing a laser level on the existing lifting device and marking the scale lines, the horizontal visual monitoring of the lifting device is made easier, avoiding repeated manual measurement of the level.

[0028] (2) The present invention provides a method for hoisting a lifting device for offshore wind power jackets, which adopts a detachable leveling auxiliary mechanism. By installing the lifting device before hoisting and disassembling it after hoisting, the recyclability is ensured and the leveling cost is reduced.

[0029] (3) The present invention provides a method for lifting and installing a lifting device for offshore wind turbine jackets. By adjusting the auxiliary lifting belt with a double-headed adjusting screw and monitoring the real-time pressure of the load-bearing lifting belt with a pressure sensor, the position and stacking order of the load-bearing lifting belt are adjusted, and the level of the lifting device is precisely adjusted. This ensures the level of the object being lifted after docking with the lifting device, effectively preventing the object from being damaged due to tilting and imbalance during the lifting process, thus avoiding malfunctions during use. At the same time, it can eliminate uncontrollable human factors that affect the quality.

[0030] (4) The present invention provides a method for hoisting a lifting device for offshore wind turbine jackets, wherein the pressure sensor can be a pin-type pressure sensor. The pin-type sensor can simultaneously monitor the tension of the sling at a pair of lifting points, reducing the monitoring data and the difficulty of adjusting the sling. Attached Figure Description

[0031] Figure 1 This is a laser schematic diagram of using a laser level to monitor the level of a lifting device in this invention.

[0032] Figure 2 This is a top view of the detachable leveling auxiliary mechanism in this invention.

[0033] Figure 3 This is a side view of the connection between the detachable leveling auxiliary mechanism and the sling in this invention.

[0034] The specific annotations in the attached drawings are as follows: 1. Center of the lifting beam; 2. Hook; 31. Load-bearing sling; 32. Auxiliary sling; 41. Level; 42. Laser; 5. Scale line; 6. Double-headed adjusting screw; 7. Pressure sensor; 71. Shaft pin sensor; 8. Wireless signal transmitter. Detailed Implementation

[0035] To better understand the purpose, structure, and function of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments.

[0036] In the description of this invention, it should be noted that the positional relationships indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" are based on the positional relationships shown in the accompanying drawings and are only for the purpose of facilitating the description of the embodiments of this invention and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific direction, and therefore should not be construed as a limitation of this invention.

[0037] Example 1

[0038] This embodiment provides a method for the automatic lifting and installation of offshore wind turbine jacket structures using a lifting device. The lifting device includes a geometrically symmetrical lifting beam and at least three lifting points evenly distributed on the device. The method includes the following steps:

[0039] S1, such as Figure 1 As shown, a laser level 41 for real-time visual monitoring of the leveling status of the lifting equipment is installed on the lifting equipment, and scale lines 5 for visual monitoring by the level 41 are marked on the upper surface of the lifting beam:

[0040] The scale lines 5 are radially distributed with the center 1 of the hanging beam as the center. The scale intervals on the scale lines 5 are equal. The laser level 41 is installed at the center of the hanging beam and is adjusted to keep the laser level 41 horizontal and to allow the laser 42 of the laser level 41 to be simultaneously projected onto the scale lines 5 drawn on the hanging beam.

[0041] S2. First, place the lifting sling on the ground and visually check its current level using a laser level 41:

[0042] By observing the position of the laser 42 illuminating the lifting beam by the laser level 41, and by checking whether the laser 42 falls on the same scale line 5, the current level status of the lifting device can be determined. If there are different scale positions, the lifting device needs to be adjusted or replaced to maintain the initial level.

[0043] S3, such as Figure 2 As shown, a detachable leveling auxiliary mechanism is installed on the lifting device:

[0044] The detachable leveling auxiliary mechanism includes a double-headed adjusting screw 6 for assisting the connection of the sling 32 to the hook 2 and a pressure sensor 7 for monitoring the tension of the sling at the lifting point;

[0045] One end of the double-headed adjusting screw 6 is hinged to the lifting device, and the other end of the double-headed adjusting screw 6 is suspended from the hook 2 by a sling. There are at least two double-headed adjusting screws 6, and the angle between the hinge point of the two double-headed adjusting screws 6 and the center of the lifting beam is obtuse. Anchor holes are opened on the lifting beam, and guy ropes for wind protection and to prevent the sling from getting tangled are installed on the anchor holes for subsequent lifting. The pressure sensor 7 is installed at the lifting point of the lifting device. When the lifting device has a pair of lifting points, the pressure sensor 7 at each pair of lifting points can be a pin sensor 71. The pin sensor 71 can simultaneously monitor the sling tension at a pair of lifting points, reducing the monitoring data and the difficulty of adjusting the sling.

[0046] The detachable leveling auxiliary mechanism also includes a wireless signal transmitter 8 and a display. The pressure sensor 7 is connected to the wireless signal transmitter 8. The signal transmitter is connected to the operator's display via a signal connection, so that the sling tension data signal collected by the pressure sensor 7 can be transmitted to the display for monitoring in real time.

[0047] S4. Based on the visual results of S2, use the double-headed adjusting screw 6 and auxiliary sling 32 to adjust the lifting device to a preliminary level, and mark the position of the bolt inside the double-headed adjusting screw 6 on the double-headed adjusting screw 6 as the reference position when the lifting device is level.

[0048] S5, such as Figure 3 As shown, the length of the auxiliary sling 32 is adjusted by loosening the double-ended adjusting screw 6, so that the load-bearing slings 31 are suspended on the hook 2 in sequence. The pressure sensor 7 monitors to ensure that all load-bearing slings 31 are unloaded at this time. Then, the double-ended adjusting screw 6 is tightened to adjust the bolt inside the double-ended adjusting screw 6 to the marked position of the horizontal reference position of the lifting device.

[0049] S6. Lift the lifting device until it is completely off the ground and stop. Loosen the double-ended adjusting screw 6 to gradually apply force to the load-bearing sling 31. Adjust the position of the load-bearing sling 31 based on the monitoring data of the pressure sensor 7. At the same time, adjust the stacking order of the load-bearing sling 31 based on the visual results of the laser level 41 until the lifting device is level and the tension of each load-bearing sling 31 is the same.

[0050] S7. Remove the level 41 and store it for later use. Lift the lifting device and move it to the top of the jacket frame to ensure the lifting posture and orientation angle of the device, so as to realize the automated connection between the device and the jacket frame.

[0051] S8. After the guide frame is hoisted into place using a lifting device, move the lifting device to the recycling location and dismantle and store the detachable leveling auxiliary mechanism for future use.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Those skilled in the art can make various changes or equivalent substitutions to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention.

Claims

1. A method for hoisting a lifting device for offshore wind turbine jackets, the lifting device comprising a geometrically symmetrical lifting beam and at least three lifting points evenly distributed on the device, wherein the lifting points are positioned for connecting load-bearing slings (31), characterized in that, The method includes the following steps: S1. Install a laser level (41) on the lifting device for real-time visual monitoring of the device's horizontal status, and mark scale lines (5) on the upper surface of the lifting beam for visual monitoring by the level (41): The scale lines (5) are radially distributed with the center (1) of the hanging beam as the center. The scale intervals on the scale lines (5) are equal. The laser level (41) is installed at the center of the hanging beam and is adjusted to keep the laser level (41) horizontal and to allow the laser (42) of the laser level (41) to be simultaneously projected onto the scale lines (5) drawn on the hanging beam. S2. Place the lifting device on the ground and visually check its current level status using a laser level (41); S3. Install a detachable leveling auxiliary mechanism on the lifting device: The detachable leveling auxiliary mechanism includes a double-headed adjusting screw (6) for assisting the sling (32) in connecting to the hook (2) and a pressure sensor (7) for monitoring the tension of the sling at the lifting point; One end of the double-headed adjusting screw (6) is hinged to the lifting device, and the other end of the double-headed adjusting screw (6) is suspended on the hook (2) by the auxiliary lifting strap (32). There are at least two double-headed adjusting screws (6), and the angle between the hinge point of the two double-headed adjusting screws (6) and the center of the lifting beam is obtuse. The pressure sensor (7) is installed at the lifting point of the lifting device; S4. Based on the visual results of S2, use the double-headed adjusting screw (6) and auxiliary sling (32) to adjust the lifting device to a preliminary level, and mark the position of the bolt inside the double-headed adjusting screw (6) on the double-headed adjusting screw (6) as the horizontal reference position of the lifting device; S5. Adjust the length of the auxiliary sling (32) by loosening the double-ended adjusting screw (6) so that the load-bearing slings (31) are suspended on the hook (2) in sequence. The pressure sensor (7) monitors to ensure that all load-bearing slings (31) are unloaded at this time. Then tighten the double-ended adjusting screw (6) and adjust the bolt in the double-ended adjusting screw (6) to the marked position of the horizontal reference position of the lifting device. S6. Lift the lifting device until it is completely off the ground. Loosen the double-ended adjusting screw (6) to gradually apply force to the load-bearing sling (31). Adjust the position of the load-bearing sling (31) based on the monitoring data of the pressure sensor (7). At the same time, adjust the stacking order of the load-bearing sling (31) based on the visual results of the laser level (41) until the lifting device is level and the tension of each load-bearing sling (31) is the same. S7. Remove the level (41) and store it for later use. Lift the lifting device and move it to the top of the guide frame to ensure the lifting posture and orientation angle of the lifting device, so as to realize the automatic connection between the lifting device and the guide frame. S8. After the guide frame is hoisted into place using a lifting device, move the lifting device to the recycling location and dismantle and store the detachable leveling auxiliary mechanism for future use.

2. The method for hoisting and constructing a lifting device for offshore wind turbine jackets according to claim 1, characterized in that, In step S2, the specific steps of visually checking the current level of the lifting device using a laser level (41) include: observing the position of the laser (42) illuminating the lifting beam by the laser level (41), and judging the current level of the lifting device by whether the laser (42) falls on the scale lines (5) at the same scale position. If there are different scale positions, the lifting device needs to be replaced or adjusted through step S4 to keep the lifting device at a preliminary level.

3. The method for hoisting and installing a lifting device for offshore wind turbine jackets according to claim 1, characterized in that, In step S3, anchor holes are made on the lifting beam, and guy ropes for wind protection and to prevent the slings from getting tangled are installed on the anchor holes.

4. The method for hoisting and installing a lifting device for offshore wind turbine jackets according to claim 1, characterized in that, In step S3, the detachable leveling auxiliary mechanism also includes a wireless signal transmitter (8) and a display. The pressure sensor (7) is connected to the wireless signal transmitter (8). The signal transmitter is connected to the operator's display via a signal connection, so that the sling tension data signal collected by the pressure sensor (7) can be transmitted to the display for monitoring in real time.

5. The method for hoisting and installing a lifting device for offshore wind turbine jackets according to claim 1, characterized in that, When the lifting device is equipped with a pair of lifting points, the pressure sensor (7) can be a pin sensor (71).

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