Marine photovoltaic grid installation method

Abstract

The present disclosure provides a method for installing offshore photovoltaic grid, and relates to the technical field of offshore photovoltaic. The method comprises the following steps: placing the grid at a first hoisting position, and placing the grid on the ground in a first posture; driving a hoisting device to the first position; connecting the hoisting device and the grid; keeping the grid in the first posture, and lifting the grid to a second hoisting position; at the second hoisting position, adjusting the grid to make the grid hang in the air in a second posture, and the second posture is a state that the grid has an included angle of 10°-18° with the sea level; keeping the second posture, moving the grid to a transport ship, and transporting the grid to a preset laying position by the transport ship in the second posture, and connecting the grid and a pile foundation structure in the second posture. The method can improve the installation reliability of offshore photovoltaic grid.

Description

Technical Field

[0001] This disclosure relates to the field of offshore photovoltaic technology, and more specifically, to a method for installing an offshore photovoltaic grid. Background Technology

[0002] Solar energy, due to its cleanliness and other characteristics, has received widespread attention as a renewable resource and has promising application prospects. Compared to traditional terrestrial solar PV, offshore solar PV can utilize the relatively abundant solar energy resources at sea. However, it also faces the challenges of the complex marine environment. In particular, the photovoltaic (PV) panels, as the core component of energy conversion, are crucial, and their placement directly determines the overall energy utilization rate of offshore solar PV. Therefore, the placement of PV panels is extremely important. The location of the PV panels is determined by the supporting structure, and the reliability of the grid structure supporting the PV panels determines the reliability of the PV panel installation. However, given the complex marine environment, the installation of the grid structure becomes more difficult, and ensuring installation reliability is challenging.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] In view of this, a method for installing offshore photovoltaic grid structures is provided, which can improve the installation reliability of the grid structures.

[0005] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part by practice of this disclosure.

[0006] According to one aspect of this disclosure, a method for installing an offshore photovoltaic grid structure is provided, the method comprising:

[0007] The space frame is placed at the first lifting position, which is located at the front edge of the dock. The space frame is set on the ground in a first posture, which is that the space frame is set parallel to the ground. The space frame includes a first long side and a second long side that are parallel to each other. The space frame includes a first lifting point and a second lifting point set on the first long side, and a third lifting point and a fourth lifting point set on the second long side.

[0008] The lifting device is moved to a first position, which is a preset distance from the first lifting position. The lifting device includes a first rigging, a second rigging, a third rigging, and a fourth rigging.

[0009] Connect the first lifting point to the first rigging, the second lifting point to the second rigging, the third lifting point to the third rigging, and the fourth lifting point to the fourth rigging;

[0010] While maintaining the first posture, the first rigging, the second rigging, the third rigging, and the fourth rigging are lifted to raise the space frame to a second lifting position, which is located on the same vertical line as the first lifting position.

[0011] At the second lifting position, the first rigging, the second rigging, the third rigging, and the fourth rigging are adjusted so that the space frame is suspended in the air in a second posture. The second posture is a state in which the space frame has a preset angle with the sea level, and the preset angle is 10° to 18°.

[0012] The transport ship is driven to one side of the lifting device, the space frame is kept in the second posture, and the space frame is moved to directly above the transport ship by the lifting device;

[0013] The net frame is lowered in the second posture until it contacts the transport ship. The net frame is then fixed to the transport ship while maintaining the second posture and transported to the preset laying position.

[0014] The space frame is lifted from the transport ship to the top of the pile foundation structure in the second posture;

[0015] The space frame is welded to the pile foundation structure via flange welding.

[0016] In an exemplary embodiment of this disclosure, the distance between the first lifting position and the second lifting position is 7.5m to 8.5m. At the second lifting position, the first rigging, the second rigging, the third rigging, and the fourth rigging are adjusted so that the space frame is suspended in the air in a second posture, wherein the second posture is a state in which the space frame has a preset angle with the sea level. The method includes:

[0017] The first and second rigging are lowered simultaneously at a first speed, while the third and fourth rigging remain stationary, until the net frame forms a preset angle with the sea level, wherein the first speed is a uniform speed not greater than 0.5 m / min.

[0018] In an exemplary embodiment of this disclosure, the distance between the first lifting position and the second lifting position is 2m to 3m. At the second lifting position, the first rigging, the second rigging, the third rigging, and the fourth rigging are adjusted so that the space frame is suspended in the air in a second posture, wherein the second posture is a state in which the space frame has a preset angle with the sea level. The method includes:

[0019] The third and fourth rigging are simultaneously lifted at a second speed, while the first and second rigging remain stationary until the net frame forms a preset angle with the sea level, wherein the second speed is a uniform speed not greater than 0.5 m / min.

[0020] In one exemplary embodiment of this disclosure, before maintaining the space frame in the first posture and hoisting the first rigging, the second rigging, the third rigging, and the fourth rigging to raise the space frame to a second hoisting position, the method further includes:

[0021] The space frame is kept in the first posture, and the first rigging, the second rigging, the third rigging and the fourth rigging are lifted at a third speed to raise the space frame to a third lifting position, wherein the third lifting position is located between the first lifting position and the second lifting position, and the third speed is a uniform speed not greater than 0.5 m / min;

[0022] Within a preset time period, the grid structure is kept in the first posture at the third lifting position.

[0023] In one exemplary embodiment of this disclosure, the distance between the first lifting position and the third lifting position is 0.25m to 0.35m.

[0024] In one exemplary embodiment of this disclosure, the space frame further includes a first wind-catching point and a second wind-catching point disposed on the first long side, and the lifting device is further provided with a first wind-catching rope and a second wind-catching rope. Before the lifting device lifts the space frame, the method further includes:

[0025] Connect the first wind-catching point and the first wind-catching cable to form a first connection structure;

[0026] The second wind-catching point and the second wind-catching cable are connected to form a second connection structure, and the first connection structure and the second connection structure are symmetrically arranged.

[0027] In one exemplary embodiment of this disclosure, the method further includes: adjusting the orientation of the space frame by controlling the first connection structure and / or the second connection structure.

[0028] In one exemplary embodiment of this disclosure, the transport vessel includes a fixing fixture integrally connected to the transport vessel, and the space frame maintains the second posture and is fixed to the transport vessel, including:

[0029] The transport vessel is positioned directly beneath the grid structure so that the orthographic projection of the grid structure on the sea level covers the orthographic projection of the fixing fixture on the sea level.

[0030] The space frame is lowered in the second posture until it contacts the fixing fixture;

[0031] Connect the fixed fixture and the space frame.

[0032] In one exemplary embodiment of this disclosure, the fixing fixture includes a first support structure and a second support structure. The first support structure and the second support structure are respectively arranged perpendicular to the transport ship. There is a preset distance between the first support structure and the second support structure, and the height of the second support structure is greater than the height of the first support structure. The angle between the line connecting the vertex of the first support structure and the vertex of the second support structure and the sea level is the preset angle.

[0033] In one exemplary embodiment of this disclosure, the preset included angle is 15°.

[0034] The offshore photovoltaic grid installation method disclosed herein involves lifting the grid from a first lifting position to a second lifting position, and adjusting the grid from a first posture to a second posture at the second lifting position. The second posture involves the grid forming a preset angle with the sea level, while the first posture involves the grid being parallel to the ground. The grid is then transferred to a transport vessel in the second posture and transported to a predetermined laying location. Simultaneously, transportation and installation are performed in the second posture. This method achieves two advantages: first, it reduces the difficulty of posture adjustment, avoiding the impact of various adverse factors at sea; second, it ensures that the angle between the grid and the sea level is within the preset angle. Within this range, it provides an effective installation angle for subsequent photovoltaic panel installation, thereby ensuring the energy utilization rate of the photovoltaic panels and improving the efficiency of the entire structure. Thirdly, the offshore photovoltaic grid structure installed by this method experiences uniform force during hoisting, ensuring the structural integrity and strength of the grid structure, improving the installation reliability, and thus extending the service life of the overall structure. The grid structure installation method provided in this disclosure, through the cooperation of various links and steps, can improve the safety of each installation step, thereby ensuring the continuity and reliability of the installation process, avoiding the phenomenon of poor overall installation effect caused by the cumulative installation error of a certain link or some links, and improving the overall reliability and construction efficiency of the grid structure installation.

[0035] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0037] Figure 1 This is a flowchart of an exemplary embodiment of the present disclosure of a method for installing a marine photovoltaic grid.

[0038] Figure 2 This is a flowchart of another method for installing a marine photovoltaic grid in an exemplary embodiment of this disclosure.

[0039] Figure 3 This is a schematic diagram of a space frame in the first lifting position according to an exemplary embodiment of the present disclosure.

[0040] Figure 4 This is a schematic diagram of a space frame in the second lifting position according to an exemplary embodiment of the present disclosure.

[0041] Figure 5 This is a schematic diagram of a structure in an exemplary embodiment of the present disclosure, where a space frame is fixed to a transport ship.

[0042] Figure 6 This is a schematic diagram of a space frame installed on a pile foundation structure, as shown in an exemplary embodiment of this disclosure.

[0043] Figure 7 This is a schematic diagram illustrating the connection relationship between the wind-catching point of a space frame and the wind-catching cable of a lifting device in an exemplary embodiment of this disclosure.

[0044] The reference numerals in the attached figures are explained as follows:

[0045] 10. Space frame; 101. First lifting point; 102. Second lifting point; 103. Third lifting point; 104. Fourth lifting point; 20. Lifting device; 201. First rigging; 202. Second rigging; 203. Third rigging; 204. Fourth rigging; 301. First lifting position; 302. Second lifting position; 401. First wind-catching point; 402. Second wind-catching point; 403. First wind-catching cable; 404. Second wind-catching cable; 30. Transport ship; 500. Fixed fixtures; 501. First supporting structure; 502. Second supporting structure; 503. I-beam; 40. Pile foundation structure. Detailed Implementation

[0046] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0047] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0048] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0049] In related technologies, the installation method for terrestrial photovoltaics typically involves fixing a support structure directly on the ground, and then laying photovoltaic panels on the support structure to form the entire terrestrial photovoltaic structure. However, offshore photovoltaics face the influence of various adverse factors at sea, such as sea winds and tides. When installing the photovoltaic support structure, the impact of marine factors on the structural integrity and installation reliability of the support structure needs to be considered. Therefore, the traditional terrestrial photovoltaic grid installation method is no longer suitable for the installation of offshore photovoltaic grids.

[0050] In this disclosure, offshore photovoltaic (PV) refers to a system installed at sea that converts solar energy into electrical energy. Offshore PV may include a pile foundation structure, a grid structure, and photovoltaic panels. The pile foundation structure may refer to pipe piles, one end of which is sunk into the sea and fixed below sea level, while the other end extends above sea level, providing support for the grid structure. The grid structure is connected to the end of the pile foundation structure that extends above sea level. It typically has a cubic or near-cubic shape with two relatively large, opposite faces. The face facing the sea level is connected to the pile foundation structure, while the face facing away from the sea level is used to lay the photovoltaic panels. The photovoltaic panels, laid on the grid structure, are used to convert solar energy into electrical energy.

[0051] It should be noted that offshore photovoltaic systems may also include devices such as inverters used to assist in power conversion, as well as installation structures for installing these devices. The offshore photovoltaic systems provided in this disclosure should be understood to also include other structures necessary for the offshore photovoltaic structure, which will not be specifically described here.

[0052] Based on this, the present disclosure provides a method for installing an offshore photovoltaic grid, such as... Figure 1 As shown, the method includes steps S10 to S90.

[0053] In step S10: the space frame is placed at the first lifting position, which is located at the front edge of the wharf. The space frame is set on the ground in a first posture, which is a state in which the space frame is parallel to the ground. The space frame includes a first long side and a second long side that are parallel to each other. The space frame includes a first lifting point and a second lifting point set on the first long side, as well as a third lifting point and a fourth lifting point set on the second long side.

[0054] Step S20: Move the lifting device to the first position. The first position is a preset distance from the first lifting position. The lifting device includes a first sling, a second sling, a third sling, and a fourth sling.

[0055] Step S30: Connect the first lifting point to the first rigging, the second lifting point to the second rigging, the third lifting point to the third rigging, and the fourth lifting point to the fourth rigging;

[0056] Step S40: Keep the space frame in the first position, lift the first rigging, the second rigging, the third rigging and the fourth rigging to raise the space frame to the second lifting position, which is on the same vertical line as the first lifting position;

[0057] Step S50: At the second lifting position, adjust the first rigging, the second rigging, the third rigging and the fourth rigging so that the space frame is suspended in the air in a second posture. The second posture is that the space frame has a preset angle between itself and the sea level. The preset angle is 10° to 18°.

[0058] Step S60: Move the transport ship to one side of the lifting device, keep the grid structure in the second position, and use the lifting device to move the grid structure directly above the transport ship.

[0059] Step S70: Lower the space frame in the second posture until it contacts the transport ship. The space frame is held in the second posture, fixed on the transport ship, and transported to the preset laying position.

[0060] Step S80: Lift the space frame from the transport ship to the top of the pile foundation structure in the second orientation;

[0061] Step S90: Weld the space frame to the pile foundation structure via flanges.

[0062] The offshore photovoltaic grid installation method disclosed herein ensures the stability of the grid structure during lifting by placing it at the forefront of the dock, avoiding the instability associated with direct lifting from the sea surface and providing a stable foundation for installation. The method involves lifting the grid structure from a first lifting position to a second lifting position, and then adjusting it from the first to the second position at the second lifting position. This ensures the angle between the grid structure and the sea surface remains within a preset range, providing an effective installation angle for the subsequent photovoltaic panels, thereby guaranteeing energy utilization and improving the overall structure efficiency. The connection between the four rigging slings of the lifting device and the four lifting points on the grid structure ensures uniform stress distribution during lifting, guaranteeing structural integrity and strength during installation and improving installation reliability. Furthermore, the grid structure installation method disclosed herein improves the reliability of each installation step by coordinating the connections between them, thereby reducing the cumulative effect of installation errors on installation reliability. This overall installation method enhances the reliability and stability of the grid structure, ultimately improving construction reliability and efficiency.

[0063] The following will describe in detail each step of the offshore photovoltaic grid installation method provided in the embodiments of this disclosure with reference to the accompanying drawings:

[0064] In the embodiments provided in this disclosure, such as Figure 3 As shown, in step S10, the space frame 10 is placed at the first lifting position 301, which is located at the front edge of the dock.

[0065] The grid structure 10 provided in this disclosure can be a cubic structure with a length of 69.286 m, a width of 37.279 m, and a height of 2.6 m. The minimum installation elevation of the grid structure 10 can be 6.9 m, where the installation elevation refers to the distance between the sea level and the grid structure 10. The dimensions of the grid structure 10 described above are merely illustrative. The size and structure of the grid structure 10 can be adapted to meet actual design needs and the requirements for photovoltaic panel installation. For example, if a large number of photovoltaic panels need to be installed on the grid structure 10, a grid structure 10 with a larger length and width can be selected.

[0066] The space frame 10 includes a first long side and a second long side that are parallel to each other. The first long side and the second long side can refer to two sides that extend along the length direction of the space frame 10. A first lifting point 101 and a second lifting point 102 are provided on the first long side, and a third lifting point 103 and a fourth lifting point 104 are provided on the second long side. It should be noted that the first lifting point 101, the second lifting point 102, the third lifting point 103, and the fourth lifting point 104 are all located on the same surface of the space frame 10. The fact that the first lifting point 101 and the second lifting point 102 are located on the first long side can mean that they are strictly aligned with the straight line of the first long side of the space frame 10, or it can mean that they are located in the vicinity of the first long side. Similarly, the fact that the third lifting point 103 and the fourth lifting point 104 are located on the second long side can mean that they are strictly aligned with the straight line of the second long side of the space frame 10, or it can mean that they are located in the vicinity of the second long side. In this disclosure, to ensure the uniformity of force distribution on the four lifting points of the space frame 10, the four lifting points are typically arranged symmetrically on one surface of the space frame 10. However, when the space frame 10 is an asymmetrical structure, in order to improve the uniformity of the force on the lifting points, the four lifting points can also be set asymmetrically on one side of the space frame 10.

[0067] The grid frame 10 can be composed of multiple chords, struts, purlins, tie rods, and connecting nodes. These components can be connected using one or more methods such as welding, riveting, and bonding to form the grid frame 10. In this disclosure, the grid frame 10 provides a laying position and support position for the photovoltaic panels. Its setting position determines the subsequent setting position of the photovoltaic panels; that is, the angle between the grid frame 10 and the sea level can be understood as the angle between the photovoltaic panels and the sea level. However, it should be understood that in order to make the angle between the photovoltaic panels and the sea level change with the sun's angle, an automatic control structure can be set between the photovoltaic panels and the grid frame 10, so that the photovoltaic panels can adjust their position according to the sun's angle. It is understood that this embodiment is implemented or modified based on the grid frame 10 providing support for the photovoltaic panels, and the method provided in this disclosure is also applicable.

[0068] The space frame 10 is placed at the first lifting position 301, which is located at the edge of the wharf, meaning the wharf location close to the coastline. Due to the large size of the space frame 10 and the difficulty of its assembly, it can be assembled on the wharf before being placed at the first lifting position 301 to ensure the integrity and structural strength of the space frame 10.

[0069] The space frame 10 is positioned on the ground at the front edge of the wharf in a first posture. The first posture is a state where the space frame 10 is parallel to the ground, that is, when the space frame 10 is in the first posture, it is placed at a horizontal angle of 0° at the front edge of the wharf. The first posture can ensure the stability of the placement and initial lifting of the space frame 10. In this disclosure, the first posture can refer to the space frame 10 being strictly parallel to the ground. However, due to the existence of installation errors, the first posture can refer to the space frame 10 having a certain angle with the ground. When this angle is generally no more than 3°, the space frame 10 can be considered to be in the first posture.

[0070] A support frame can be installed between the space frame 10 and the ground to prevent deformation or damage to the space frame 10 due to uneven ground. The structure and dimensions of the support frame can be designed and selected according to the structure and dimensions of the space frame 10.

[0071] In the embodiments provided in this disclosure, such as Figure 3 As shown, in step S20, the lifting device 20 is moved to the first position, and the first position is at a preset distance from the first lifting position 301.

[0072] The lifting device 20 can be a crane, a crane ship, or other structure or device with a lifting system. Taking a crane ship as an example, the crane ship is driven to the first position, which is a sea position at a certain distance from the coastline. The first lifting position 301 is the position at the front edge of the dock. There is a preset distance between the first position and the first lifting position 301. In order to ensure the lifting effect of the lifting device 20, the preset distance is usually 8m to 12m. In order to further improve the lifting effect, the preset distance can be 10m.

[0073] The lifting device 20 may include a connected lifting beam and rigging. The lifting beam may be a rectangular structure. The rigging includes a first rigging 201, a second rigging 202, a third rigging 203, and a fourth rigging 204. The four riggings are respectively connected to the four corners of the lifting beam structure and hang naturally in the vertical direction. Each rigging may also include a hook, which can be used to connect the rigging to the space frame 10 for lifting the space frame 10. The specific structure and materials of the lifting beam and rigging are available in the art and will not be described in detail here. The lifting device 20 may also include a device such as a winch that can drive the rigging to lengthen or shorten, so as to adjust the length of the rigging and thus adjust the posture of the space frame 10.

[0074] In the embodiments provided in this disclosure, in step S30, the first lifting point 101 is connected to the first rigging 201, the second lifting point 102 is connected to the second rigging 202, the third lifting point 103 is connected to the third rigging 203, and the fourth lifting point 104 is connected to the fourth rigging 204.

[0075] By connecting the four lifting points of the space frame 10 to the four rigging of the lifting device 20, a foundation can be provided for the subsequent lifting of the space frame 10. The lifting device 20 can improve the uniformity of the force on the space frame 10 and prevent the space frame 10 from deforming due to uneven force during lifting, thereby improving the structural strength of the space frame 10.

[0076] After step S30 and before step S40, the method further includes: maintaining the space frame 10 in a first posture, lifting the first rigging 201, the second rigging 202, the third rigging 203 and the fourth rigging 204 at a third speed to raise the space frame 10 to a third lifting position; and maintaining the space frame 10 in the first posture at the third lifting position for a preset time.

[0077] To ensure the reliability of the connection between the lifting device 20 and the space frame 10, as well as the reliability of the lifting, the space frame 10 can be pre-lifted before being lifted. Specifically, the space frame 10 can be lifted to the third lifting position, which is located between the first lifting position 301 and the second lifting position 302. The distance between the third lifting position and the first lifting position 301 can be 0.25m to 0.35m. To effectively verify the lifting reliability of the lifting device, the distance between the third lifting position and the first lifting position 301 can be 0.3m.

[0078] Because the space frame 10 is large in size and has a complex structure, in order to ensure the safety of lifting, the lifting speed of the space frame 10 should not be too high. Therefore, the third speed is a uniform speed of no more than 0.5 m / min. For example, the third speed can be 0.5 m / min, 0.4 m / min, 0.3 m / min, 0.2 m / min or 0.1 m / min, etc. The first speed, second speed and third speed are similar below, and the values ​​of the first speed and second speed will not be listed one by one.

[0079] After the space frame 10 is lifted to the third lifting position, it is kept in the first posture at the third lifting position for a preset time. At the third lifting position, the space frame 10 is still in a horizontal 0° posture with the ground (first posture). In order to facilitate the verification of the reliability of the connection between the space frame 10 and the lifting device 20, the preset time can be 3 minutes to 8 minutes. If the preset time is too short, it is not conducive to observing whether there is a break in the connection between the space frame 10 and the lifting device 20. If the preset time is too long, it will increase the stress time of the space frame 10, which is not conducive to the structural stability of the space frame 10. Usually, the preset time can be 5 minutes.

[0080] If, after the space frame 10 has been stationary at the third lifting position for a preset time, there is no breakage in the connection between the rigging and the lifting point, and the structure of the space frame 10 has no obvious deformation or the deformation is within a preset range, then the lifting of the space frame 10 can continue. If there is a breakage in the connection between the rigging and the lifting point, or if the structure of the space frame 10 is obviously deformed or the deformation is outside the preset range, then the space frame 10 needs to be placed back at the first lifting position 301, and the connection between the space frame 10 and the lifting device 20 needs to be readjusted.

[0081] In the embodiments provided in this disclosure, such as Figure 7As shown, the space frame 10 also includes a first wind-catching point 401 and a second wind-catching point 402 disposed on the first long side. The lifting device 20 is also provided with a first wind-catching cable 403 and a second wind-catching cable 404. After step S30 and before step S40, the method further includes: connecting the first wind-catching point 401 and the first wind-catching cable 403 to form a first connecting structure; connecting the second wind-catching point 402 and the second wind-catching cable 404 to form a second connecting structure. The first connecting structure and the second connecting structure are symmetrically arranged.

[0082] Because the space frame 10 is a large structure, and its location at sea and along the dock is within a marine environment, it is subject to strong sea winds. After the space frame 10 is lifted and removed from the dock, the sea winds cause it to shift laterally in the air, leading to instability. This can make the connection between the lifting device 20 and the space frame 10 prone to breakage, or cause deformation due to the lateral movement. Therefore, to further improve the installation reliability of the space frame 10, wind-catching points are installed on the space frame 10, and wind-catching cables are installed on the lifting device 20. The wind-catching cables and wind-catching points are interconnected, which can improve the stability of lifting the space frame 10.

[0083] Furthermore, the first and second connecting structures are symmetrically arranged, which can improve the stability of the wind cable and prevent it from breaking due to uneven stress.

[0084] Furthermore, the method also includes adjusting the posture of the space frame 10 by controlling the first connecting structure and / or the second connecting structure. In an exemplary embodiment, by controlling one of the first or second connecting structures individually to adjust the posture of the space frame 10, during the process of lifting the space frame 10 from the first posture to the third posture, from the third posture to the second posture, and during transportation and installation in the second posture, the posture of the space frame can be finely adjusted by the first or second connecting structure, or the external forces on the space frame 10 can be offset by the first or second connecting structure, avoiding deformation of the space frame or the posture of the space frame being outside the preset range. In an exemplary embodiment, the balance of the space frame 10 during the installation process can be maintained by simultaneously controlling the first and second connecting structures, while also avoiding the influence of external forces on the lifting device 20, thus ensuring the balance and lifting safety of the lifting device 20.

[0085] The wind-catching points set on the space frame 10 can be structures that can be connected to the wind-catching cables, such as lugs or hooks, or they can be structures such as holes directly opened on the space frame 10.

[0086] In the embodiments provided in this disclosure, such as Figure 4As shown, after the pre-lifting of the space frame 10, steps S40 and S50 are performed to keep the space frame 10 in a first posture and lift the first rigging 201, the second rigging 202, the third rigging 203 and the fourth rigging 204 to raise the space frame 10 to a second lifting position 302. The second lifting position 302 is on the same vertical line as the first lifting position 301. At the second lifting position 302, the first rigging 201, the second rigging 202, the third rigging 203 and the fourth rigging 204 are adjusted so that the space frame 10 is suspended in the air in a second posture. The second posture is a state in which the space frame 10 has a preset angle with the sea level, and the preset angle is 10° to 18°.

[0087] In offshore photovoltaic structures, the grid frame 10 supports the photovoltaic panels. Therefore, the position of the grid frame 10 needs to be adapted to the position requirements of the photovoltaic panels. To improve the solar energy absorption rate of the photovoltaic panels, the angle between the photovoltaic panels and the sea level is typically 10° to 18°. Therefore, the grid frame 10 also needs to be at an angle of 10° to 18° to ensure compatibility between the grid frame 10 and the photovoltaic panels. To further improve the utilization and absorption rate of solar energy by the photovoltaic panels, the angle between the grid frame 10 and the sea level can be 15°.

[0088] When installing the space frame 10, it is difficult to adjust the attitude of the space frame 10 on the sea surface due to the many unfavorable factors at sea. Furthermore, the safety and reliability of directly adjusting the attitude of the space frame 10 on the sea surface are difficult to guarantee. Therefore, the method provided in this disclosure is to adjust the attitude of the space frame 10 at the second lifting position 302 so that the angle between the space frame 10 and the sea surface is within a preset angle range. The second lifting position 302 and the first lifting position 301 are located on the same vertical line, which improves the safety and reliability of the attitude adjustment of the space frame 10.

[0089] When the space frame 10 is lifted to the second lifting position 302, it is necessary to keep the space frame 10 stationary at the second lifting position 302 to ensure that the space frame 10 can adjust its posture at a preset speed, avoid instability of the initial posture of the space frame 10 due to lateral movement or swaying, and ensure the stability and reliability of the connection between the space frame 10 and the lifting device 20.

[0090] In some embodiments, when the distance between the first lifting position 301 and the second lifting position 302 is 7.5m to 8.5m, the method for adjusting the attitude of the space frame 10 may include: simultaneously lowering the first rigging 201 and the second rigging 202 at a first speed, while keeping the third rigging 203 and the fourth rigging 204 stationary, until the space frame 10 forms a preset angle with the sea level, wherein the first speed is a uniform speed not greater than 0.5m / min.

[0091] To improve the stability and reliability of the attitude adjustment of the space frame 10, the distance between the first lifting position 301 and the second lifting position 302 can be 8m to 8.5m. When the space frame 10 is lifted to the second lifting position 302, after hovering in the air, the first rigging 201 and the second rigging 202 are lowered at a uniform speed of 0.5m / min, while the third rigging 203 and the fourth rigging 204 are kept stationary until the angle between the space frame 10 and the sea level is 15°, thus completing the reliable adjustment of the space frame 10 from the first attitude to the second attitude.

[0092] In some embodiments, when the distance between the first lifting position 301 and the second lifting position 302 is 2m to 3m, the method for adjusting the attitude of the space frame 10 may include: simultaneously lifting the third rigging 203 and the fourth rigging 204 at a second speed, and keeping the first rigging 201 and the second rigging 202 stationary until the space frame 10 forms a preset angle with the sea level, wherein the second speed is a uniform speed not greater than 0.5m / min.

[0093] To improve the stability and reliability of the attitude adjustment of the space frame 10, the distance between the first lifting position 301 and the second lifting position 302 can be 2.5m to 3m. When the space frame 10 is lifted to the second lifting position 302, after hovering in the air, the third rigging 203 and the fourth rigging 204 are lifted at a uniform speed of 0.5m / min, while keeping the first rigging 201 and the second rigging 202 stationary until the angle between the space frame 10 and the sea level is 15°, thus completing the reliable adjustment of the space frame 10 from the first attitude to the second attitude.

[0094] like Figure 5 As shown, after the space frame 10 completes the attitude adjustment, the method further includes: maintaining the second attitude, transferring the space frame 10 to the transport ship 30, and transporting it to the preset laying position.

[0095] In some embodiments, in order to ensure that the space frame 10 is transported to the preset laying position in the second posture and to improve the reliability and safety of the transport of the space frame 10, the transport vessel 30 may include a fixing fixture 500, which is connected to the transport vessel 30 as a whole. The fixing fixture 500 may be fixedly connected to the hull plate of the transport vessel 30 by welding to improve the support reliability of the fixing fixture 500.

[0096] The fixed fixture 500 includes a first support structure 501 and a second support structure 502. The first support structure 501 and the second support structure 502 can be tubular or tubular in shape, such as a steel pipe structure. One end of the first support structure 501 and one end of the second support structure 502 are respectively vertically mounted on the hull of the transport ship 30. There is a preset distance between the first support structure 501 and the second support structure 502, and the height of the second support structure 502 is greater than the height of the first support structure 501. The angle between the line connecting the apex of the first support structure 501 and the apex of the second support structure 502 and the sea level is a preset angle. By setting the fixed fixture 500 on the transport ship 30, during the transportation of the space frame 10, the angle between the space frame 10 and the sea level can be ensured to always be within the preset angle range, avoiding the subsequent process of readjusting the attitude of the space frame 10 on the sea surface, thus improving the installation efficiency and reliability of the space frame 10.

[0097] Furthermore, in order to enhance the support strength of the first support structure 501 and the second support structure 502, a reinforcing structure, such as an I-beam 503, can be connected between the first support structure 501 and the second support structure 502. This can improve the structural strength of the fixing fixture 500 and enhance the support of the fixing fixture 500 for the space frame 10.

[0098] like Figure 5 As shown, the specific method for lifting the space frame 10 onto the transport ship 30 includes: driving the transport ship 30 to one side of the lifting device 20, keeping the space frame 10 in a second posture, and using the lifting device 20 to move the space frame 10 directly above the transport ship 30; lowering the space frame 10 in the second posture until the space frame 10 contacts the transport ship 30; keeping the space frame 10 in the second posture, fixing it on the transport ship 30, and transporting it to the preset laying position.

[0099] In one embodiment, on the transport vessel 30, the space frame 10 contacts and is fixed to the fixed fixture 500, so that the space frame 10 always maintains the second posture during the transport process of the transport vessel 30.

[0100] The fixing fixture 500 and the space frame 10 are connected, and the space frame 10 is transported to the preset laying position. The fixing fixture 500 and the space frame 10 can be connected by bolts or other means.

[0101] like Figure 6As shown, after the transport ship 30 transports the space frame 10 to the preset laying position, the method further includes: lifting the space frame 10 from the transport ship 30 to the top of the pile foundation structure 40 in a second posture; and welding the space frame 10 to the pile foundation structure 40 via flange welding. Since the space frame 10 maintains a preset angle with the sea level during transport by the transport ship 30, after the transport ship 30 transports the space frame 10 to the preset laying position, the lifting device 20 can be used to lift the space frame 10 in a second posture to the end of the pile foundation structure 40 above the sea level, and the space frame 10 and the pile foundation structure 40 can be welded together by means of flange welding, etc., to fix the space frame 10.

[0102] It should be noted that the above-mentioned pile foundation structure 40 can be composed of multiple pipe piles. The angle between the line connecting the tops of the multiple pipe piles (the end away from the sea level) and the sea level is a preset angle to ensure the angle between the grid 10 and the sea level and to ensure the compatibility between the grid 10 and the photovoltaic panel. The specific pile foundation structure 40 will not be described in detail.

[0103] The offshore photovoltaic grid installation method disclosed herein ensures the stability of the grid 10 during lifting by placing it at the first lifting position 301 (at the pier front). This avoids the instability associated with directly lifting the grid 10 from the sea surface, providing a stable foundation for its installation. The method also ensures that the angle between the grid 10 and the sea surface remains within a preset range by lifting the grid 10 from the first lifting position 301 to the second lifting position 302 and adjusting it from the first to the second position. This provides an effective installation angle for the subsequent photovoltaic panels, thereby ensuring the energy utilization rate of the photovoltaic panels and improving the overall efficiency of the structure. Furthermore, the connection between the four rigging points of the lifting device and the four lifting points on the grid 10 ensures uniform force distribution during lifting, guaranteeing the structural integrity and strength of the grid 10 during installation and improving its installation reliability.

[0104] The following is combined with Figures 2 to 7 The specific process of the offshore photovoltaic grid installation method provided in this disclosure embodiment is described below:

[0105] Step S101: Construction Preparation. This step includes assembling the space frame 10, transferring the space frame 10 to the first lifting position 301, connecting each lifting point of the space frame 10 to each sling of the lifting device 20, and connecting the wind-catching points of the space frame 10 to the wind-catching cables of the lifting device 20. The space frame 10 is placed at the first lifting position 301 in a 0° horizontal position (first position) with respect to the ground.

[0106] Step S102: Lifting Reliability Verification. This step involves using the lifting device 20 to lift the space frame 10 from its first position to the third lifting position at a uniform speed of 5 m / min, and then suspending it in the air for 5 minutes to verify the reliability of the connection between the space frame 10 and the lifting device 20. Simultaneously, the degree of deformation of the space frame 10 is verified to confirm the reliability of the lifting operation. If the space frame 10 shows no abnormalities, the next step can proceed. The distance between the third lifting position and the first lifting position 301 is 0.3 m.

[0107] Step S103: Lifting of the space frame 10. This step includes lifting the space frame 10 in a first orientation from the third lifting position (0.3m away from the first lifting position) to the second lifting position 302.

[0108] Step S104: Adjusting the attitude of the space frame 10. This step includes adjusting the space frame 10 from the first attitude to the second attitude at the second lifting position 302, wherein the second attitude is that the space frame 10 forms a 15° angle with the sea level. Specifically, when the distance between the second lifting position 302 and the first lifting position 301 is 8m to 8.5m, the first rigging 201 and the second rigging 202 can be lowered simultaneously at a uniform speed of 5m / min, while keeping the third rigging 203 and the fourth rigging 204 stationary, until the space frame 10 is adjusted to the second attitude; or when the distance between the second lifting position 302 and the first lifting position 301 is 2.5m to 3m, the third rigging 203 and the fourth rigging 204 can be raised simultaneously at a uniform speed of 5m / min, while keeping the first rigging 201 and the second rigging 202 stationary, until the space frame 10 is adjusted to the second attitude.

[0109] Step S105: The space frame 10 is lifted onto the transport ship 30 and secured. This step includes the transport ship 30 moving to a position directly below the space frame 10, lifting the space frame 10 in a second orientation to the fixing fixture 500 on the transport ship 30, and securing the space frame 10 and the fixing fixture 500 with bolts.

[0110] Step S106: The space frame 10 is transported to the preset laying position. This step includes the space frame 10 being fixed to the fixture 500 on the transport ship 30 and transported to the preset laying position in a second posture.

[0111] Step S107: Fixing the space frame 10 to the pile foundation structure 40. This step includes welding the space frame 10 to the pile foundation structure 40 using flange welding to ensure that the space frame 10 is fixed to the pile foundation structure 40 in a second posture.

[0112] Step S108: Move to the next work surface. Repeat steps S101 to S107 above until all space frames 10 are installed.

[0113] It should be noted that although the steps of the offshore photovoltaic grid installation method of this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that these steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0114] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A method for installing an offshore photovoltaic grid, characterized in that, include: The space frame is placed at the first lifting position, which is located at the front edge of the dock. The space frame is set on the ground in a first posture, which is that the space frame is set parallel to the ground. The space frame includes a first long side and a second long side that are parallel to each other. The space frame includes a first lifting point and a second lifting point set on the first long side, and a third lifting point and a fourth lifting point set on the second long side. The lifting device is moved to a first position, which is a preset distance from the first lifting position. The lifting device includes a first rigging, a second rigging, a third rigging, and a fourth rigging. Connect the first lifting point to the first rigging, the second lifting point to the second rigging, the third lifting point to the third rigging, and the fourth lifting point to the fourth rigging; While maintaining the first posture, the first rigging, the second rigging, the third rigging, and the fourth rigging are lifted to raise the space frame to a second lifting position, which is located on the same vertical line as the first lifting position. At the second lifting position, the first rigging, the second rigging, the third rigging, and the fourth rigging are adjusted so that the space frame is suspended in the air in a second posture. The second posture is a state in which the space frame has a preset angle with the sea level, and the preset angle is 10° to 18°. The transport ship is driven to one side of the lifting device, the space frame is kept in the second posture, and the space frame is moved to directly above the transport ship by the lifting device; The net frame is lowered in the second posture until it contacts the transport ship. The net frame is then fixed to the transport ship while maintaining the second posture and transported to the preset laying position. The space frame is lifted from the transport ship to the top of the pile foundation structure in the second posture; The space frame is welded to the pile foundation structure via flange welding.

2. The method for installing a marine photovoltaic grid according to claim 1, characterized in that, The distance between the first lifting position and the second lifting position is 7.5m to 8.5m. At the second lifting position, the first rigging, the second rigging, the third rigging, and the fourth rigging are adjusted so that the space frame is suspended in the air in a second posture, where the space frame has a preset angle with the sea level. The method includes: The first and second rigging are lowered simultaneously at a first speed, while the third and fourth rigging remain stationary, until the net frame forms a preset angle with the sea level, wherein the first speed is a uniform speed not greater than 0.5 m / min.

3. The method for installing a marine photovoltaic grid according to claim 1, characterized in that, The distance between the first lifting position and the second lifting position is 2m to 3m. At the second lifting position, the first rigging, the second rigging, the third rigging, and the fourth rigging are adjusted so that the space frame is suspended in the air in a second posture, where the space frame has a preset angle with the sea level. The method includes: The third and fourth rigging are simultaneously lifted at a second speed, while the first and second rigging remain stationary until the net frame forms a preset angle with the sea level, wherein the second speed is a uniform speed not greater than 0.5 m / min.

4. The method for installing a marine photovoltaic grid according to claim 1, characterized in that, Before maintaining the space frame in the first posture and lifting the first, second, third, and fourth rigging to raise the space frame to the second lifting position, the method further includes: The space frame is kept in the first posture, and the first rigging, the second rigging, the third rigging and the fourth rigging are lifted at a third speed to raise the space frame to a third lifting position, wherein the third lifting position is located between the first lifting position and the second lifting position, and the third speed is a uniform speed not greater than 0.5 m / min; Within a preset time period, the grid structure is kept in the first posture at the third lifting position.

5. The method for installing a marine photovoltaic grid according to claim 4, characterized in that, The distance between the first lifting position and the third lifting position is 0.25m to 0.35m.

6. The method for installing a marine photovoltaic grid according to claim 1, characterized in that, The space frame further includes a first wind-catching point and a second wind-catching point disposed on the first long side. The lifting device is also equipped with a first wind-catching rope and a second wind-catching rope. Before the lifting device lifts the space frame, the method further includes: Connect the first wind-catching point and the first wind-catching cable to form a first connection structure; The second wind-catching point and the second wind-catching cable are connected to form a second connection structure, and the first connection structure and the second connection structure are symmetrically arranged.

7. The method for installing a marine photovoltaic grid according to claim 6, characterized in that, The method further includes adjusting the orientation of the space frame by controlling the first connection structure and / or the second connection structure.

8. The method for installing a marine photovoltaic grid according to claim 1, characterized in that, The transport vessel includes a fixing fixture, which is integrally connected to the transport vessel. The space frame maintains the second posture and is fixed to the transport vessel, including: The transport vessel is positioned directly beneath the grid structure so that the orthographic projection of the grid structure on the sea level covers the orthographic projection of the fixing fixture on the sea level. The space frame is lowered in the second posture until it contacts the fixing fixture; Connect the fixed fixture and the space frame.

9. The method for installing a marine photovoltaic grid according to claim 8, characterized in that, The fixed fixture includes a first support structure and a second support structure. The first support structure and the second support structure are respectively arranged perpendicular to the transport ship. There is a preset distance between the first support structure and the second support structure, and the height of the second support structure is greater than the height of the first support structure. The angle between the line connecting the vertex of the first support structure and the vertex of the second support structure and the sea level is the preset angle.

10. The method for installing a marine photovoltaic grid according to any one of claims 1-9, characterized in that, The preset included angle is 15°.

Images