Temporary fixing device for offshore photovoltaic grid

Abstract

The invention relates to a temporary fixing device for an offshore photovoltaic net rack. The temporary fixing device is suitable for rapid positioning and temporary fixing of a pile foundation in the net rack hoisting process. The device comprises a connecting node, an inverted cone, a shell, a wedge-shaped sliding block and the like, a temporary fixing device is welded to the lower portion of the connecting node, in the net rack hoisting and falling process, the inverted cone achieves automatic positioning under the action of a guide plate, and after the shell enters a pile foundation, the wedge-shaped sliding block automatically pops up and is limited and fixed under the action of a compression spring; the temporary fixation of the upper net rack is realized; the structure is in a pure mechanical mode, manual intervention is not needed, the wind load influence can be effectively resisted, and the hoisting operation efficiency and the offshore construction safety are improved.

Description

Technical Field

[0001] The present invention belongs to the field of offshore photovoltaic installation equipment, and in particular relates to a temporary fixing device for an offshore photovoltaic grid. Background Art

[0002] The structure of offshore photovoltaics is mainly fixed with pile foundations. The upper part adopts standardized prefabricated modules, such as steel grids or steel trusses. After pre-assembly on land, the whole module is hoisted and fixed to the steel pipe column by welding or bolting, which reduces the time of offshore operations.

[0003] Offshore photovoltaic grids typically measure 50m x 30m, 60m x 35m, or even larger, and the total hoisting weight, including the photovoltaic panels, is approximately 100t. Such a large wind-exposed area results in poor hoisting stability. Construction cannot proceed in winds exceeding force 5 or when waves are violent, leaving a very limited window for daily hoisting operations.

[0004] Before the upper grid and the lower pile foundation are fully fixed, once subjected to a large wind load, the grid cannot be fixed to the pile foundation by gravity alone, resulting in relative displacement between the upper grid and the lower pile foundation, making welding or bolt connection operations difficult, seriously affecting the connection quality and posing a risk of structural damage. At higher wind speeds, the grid may even be blown over. Therefore, after the upper grid is hoisted into place, the installation vessel usually cannot release the hook immediately. It must wait until the welding construction at the connection between the grid and the steel pipe pile is completed or the initial tightening of the bolts is completed before releasing the hook. It usually takes only one hour to lift the grid from the transport ship to the pile foundation, but it takes 2-3 hours to complete the bolt connection of 4 piles and 4-5 hours to complete the welding connection, which seriously affects the operating time of the crane ship, reduces work efficiency, and increases the risk of offshore operations. The short operating window, coupled with the long connection and fixation operation time, means that the average daily hoisting capacity of offshore photovoltaic grids is only 4-6 platforms.

[0005] The offshore photovoltaic grid is exposed to a large area of wind. Before the upper grid and the lower pile foundation are completely fixed, once it is subjected to a large wind load, the grid is difficult to be fixed on the pile foundation by gravity alone, and there is even the possibility of being blown over. After the upper grid is hoisted into place, the crane ship usually cannot release the hook immediately and must wait until the welding construction of the connection between the grid and the steel pipe pile is completed. The offshore welding is difficult and time-consuming, which seriously affects the operation time of the crane ship, reduces work efficiency, and increases the risk of offshore operations. Therefore, whether it is pre-welding, assembly, and overall hoisting, or temporary hoisting, on-site welding, and assembly, the operation method has obvious technical defects and is difficult to adapt to the development needs of photovoltaics. The installation cost is high, the cycle is long, and the engineering risk is high. Summary of the Invention

[0006] The purpose of the present invention is to provide a temporary fixing device for an offshore photovoltaic grid, which is used to connect the grid and the pile foundation, comprising:

[0007] connecting nodes and temporary fixings;

[0008] The pile foundation comprises a steel pipe pile, a ring plate and a guide plate are provided on the pile top, and at least two reinforcing ribs are provided between the ring plate and the guide plate;

[0009] A semicircular welding ball is provided on the upper part of the connection node, an inverted cone is provided on the lower part, and a temporary fixing device is welded on the bottom of the inverted cone;

[0010] The temporary fixing device includes a guiding portion, a telescopic locking portion, and a supporting and limiting portion;

[0011] The guide portion is used to guide the telescopic locking portion to pass through the ring plate. The telescopic locking portion contracts after being squeezed by the ring plate, and resets and pops out after the squeezing is released, so that the support limiting portion is limited to one end surface of the ring plate, and the telescopic locking portion is limited to the other end surface of the ring plate.

[0012] This technical solution has the following technical features: In order to solve the problems of large positioning deviation, weak initial fixation, low construction efficiency and high safety risks during the hoisting and installation of offshore photovoltaic grids, a temporary fixing device is proposed;

[0013] The structure of the guide part, telescopic locking part, and support limit part, such as the specific use of a mechanical limit and automatic reset structure of "inverted cone + shell + wedge-shaped slider + compression spring + keyway guide rail", without changing the main structure of the existing grid and pile foundation, is realized by the wedge-shaped slider pre-installed in the shell structure. During the lifting process, it is squeezed by the guide plate to automatically retract, and when in place, it automatically pops out and is limited to the upper and lower sides of the pile foundation ring plate, thereby completing the rapid and precise positioning and temporary fixation of the grid, avoiding manual intervention;

[0014] This technical solution achieves automatic guidance and self-locking of the truss during placement through the coordinated action of wedge-shaped sliders, guide plates, ring plates, and other structures, significantly improving installation accuracy and safety. The wedge-shaped sliders automatically pop out and reset using compression springs, meeting the need for unmanned operation in complex offshore construction environments. Furthermore, the temporary fixing device's limiting effect allows the crane vessel to complete the unhooking operation as soon as the truss is in place, significantly improving the average daily lifting efficiency of a single vessel.

[0015] The system has been organically integrated in terms of structural design, functional implementation, and construction adaptability, and features compact structure, sensitive response, fast installation, safety, and reliability, significantly improving the automation level and operational efficiency of offshore photovoltaic construction.

[0016] A technical solution provided by this application also has the following technical features:

[0017] Preferably, in one embodiment of the present application, the temporary fixing device includes a shell and at least one wedge-shaped slider, the wedge-shaped slider is limited and positioned by a key block compression spring, a key block and a keyway guide rail, and the slider compression spring is used to resist and squeeze the wedge-shaped slider.

[0018] Preferably, in one embodiment of the present application, the shell is positioned inside the steel pipe pile by chamfering and cooperating with the guide plate. When the grid is hoisted into place, the wedge-shaped slider pops out to abut the ring plate, thereby realizing the limitation and temporary fixation of the grid to the pile foundation.

[0019] Preferably, in one embodiment of the present application, eight reinforcing ribs are evenly distributed circumferentially between the ring plate and the guide plate.

[0020] Preferably, in one embodiment of the present application, eight wedge-shaped sliders are evenly arranged circumferentially on the shell.

[0021] Preferably, in one embodiment of the present application, a moving pair is arranged between the key block and the keyway guide rail; the moving pair is equipped with two limiting structures for limiting the moving limit position of the moving pair, so that the wedge-shaped slider cannot fall out of the housing or over-compress the slider compression spring.

[0022] Preferably, in one embodiment of the present application, a chamfered structure is provided at the bottom of the shell, which is used to guide the shell along the guide plate into the interior of the steel pipe pile during the lifting process, thereby realizing automatic guided positioning of the component; the inverted cone and the guide plate cooperate to guide and limit, thereby guiding the shell into the target position of the pile foundation during the lifting process.

[0023] Preferably, in one embodiment of the present application, the wedge-shaped slider contacts the guide plate and slides into the shell during the grid positioning and installation process, so that the slider compression spring is compressed. When the positioning and installation are completed, under the elastic force of the slider compression spring, the wedge-shaped slider pops outward to achieve the limitation and temporary fixation of the upper grid.

[0024] Preferably, in one embodiment of the present application, a keyway guide rail is provided on the inner wall of the shell to limit the pop-up stroke of the wedge-shaped slider and prevent the wedge-shaped slider from detaching from the shell shell structure.

[0025] Preferably, in one embodiment of the present application, the key block is installed on the top of the wedge-shaped slider, and the key block compression spring cooperates with the keyway guide rail to limit the wedge-shaped slider to be movable in the radial direction within the guide rail, preventing it from excessive inward or outward retraction, thereby ensuring structural stability.

[0026] Preferably, in one embodiment of the present application, an inverted cone is provided at the lower part of the connection node and is used for welding connection with a temporary fixing device after installation. The inverted cone plays a guiding and positioning role during the lifting process. After the truss falls into place, its top is welded to the top of the steel pipe pile to form a permanent fixed connection.

[0027] Preferably, in one embodiment of the present application, the ring plate and the guide plate are welded to the top of the steel pipe pile, and eight reinforcing ribs are arranged at equal intervals along the circumferential direction between the ring plate and the guide plate to enhance the bending and torsional stiffness of the overall structure and improve the connection stability and bearing capacity.

[0028] Preferably, in one embodiment of the present application, after the truss is hoisted, the inverted cone is connected to the top of the steel pipe pile by welding to achieve permanent fixation; when the truss tends to be pulled up by the suction force of the wind, the wedge-shaped slider contacts the ring plate to form an upward force path, transferring the load to the pile foundation.

[0029] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention.

[0030] 1. This application overcomes the problems of inaccurate positioning and centering difficulties during the installation of the grid by providing a guiding cooperation structure of the guide plate and the inverted cone, achieving the technical effect of automatic structural guidance and precise placement;

[0031] 2. This application overcomes the problem of traditional temporary fixing methods that rely on manual pins or bolts and are complicated to operate by providing a combination structure of a wedge-shaped slider, a slider compression spring, and a keyway-type guide rail in the temporary fixing device, thereby achieving the technical effect of automatic reset of the slider and self-locking fixation of the structure.

[0032] 3. This application overcomes the poor wind resistance of traditional temporary fixed structures by providing a ring plate at the top of the steel pipe pile and its cooperation with the wedge-shaped slider, achieving effective position limiting and pull-out resistance of the grid under negative wind loads;

[0033] 4. This application uses a purely mechanical structure to achieve the guiding and temporary fixing functions, overcoming the problems of electric control structures that rely on energy, are complex to control, and difficult to maintain. It achieves the technical effect of simple structure, high reliability, and suitability for use in complex offshore environments.

[0034] 5. This application overcomes the defects of time-consuming welding or bolt connection and affecting the lifting rhythm by making the temporary fixed structure, grid connection nodes and pile foundation form a quick docking system, and achieves the technical effects of efficient crane operation, increased daily lifting volume and significantly shortened construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0036] Figure 1 This is a structural schematic diagram of a temporary fixing device for an offshore photovoltaic grid according to the present invention;

[0037] Figure 2 This is a schematic diagram of the pile top connection structure of a temporary fixing device for an offshore photovoltaic grid according to the present invention;

[0038] Figure 3 A cross-sectional view of a temporary fixing device of a temporary fixing device for an offshore photovoltaic grid according to the present invention;

[0039] Figure 4 This is an exploded view of parts of a temporary fixing device for an offshore photovoltaic grid according to the present invention;

[0040] Figure 5 This is a schematic diagram of the construction steps of a temporary fixing device for an offshore photovoltaic grid according to the present invention;

[0041] Components in the picture:

[0042] 1. Pile foundation

[0043] 11. Steel pipe piles

[0044] 12. Ring plate

[0045] 13. Reinforcement

[0046] 14. Guide plate

[0047] 2. Temporary fixing device

[0048] 21. Shell

[0049] 22. Wedge Slider

[0050] 23. Slider compression spring

[0051] 24. Key block compression spring

[0052] 25. Key Block

[0053] 26. Keyway guide rail

[0054] 3. Connecting nodes

[0055] 31. Semicircular welding ball

[0056] 32. Inverted cone

[0057] 4. Grid. DETAILED DESCRIPTION

[0058] The following further describes the specific embodiments of the present application in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present application and are not intended to limit the present invention.

[0059] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0062] like Figure 1-4 A temporary fixing device for an offshore photovoltaic grid is used to connect a grid 4 and a pile foundation 1, comprising:

[0063] Connecting node 3 and temporary fixing device 2;

[0064] The pile foundation 1 comprises a steel pipe pile 11, a ring plate 12 and a guide plate 14 are provided on the pile top, and at least two reinforcing ribs 13 are provided between the ring plate 12 and the guide plate 14;

[0065] A semicircular welding ball 31 is provided on the upper part of the connection node 3, and an inverted cone 32 is provided on the lower part. A temporary fixing device 2 is welded to the bottom of the inverted cone 32;

[0066] The temporary fixing device 2 includes a guide portion, a telescopic locking portion, and a support and limiting portion;

[0067] The guide portion is used to guide the telescopic locking portion to pass through the ring plate 12. The telescopic locking portion contracts after being squeezed by the ring plate 12, and resets and pops out after the squeezing is released, so that the support limit portion is limited to one end surface of the ring plate 12, and the telescopic locking portion is limited to the other end surface of the ring plate 12.

[0068] In order to solve the problems of low positioning accuracy, poor operation efficiency, unreliable temporary fixation, reliance on manual operation and potential safety hazards during the hoisting and installation of offshore photovoltaic grids, a temporary fixing device structure with guiding, limiting and automatic resetting functions is adopted, including an inverted cone and a shell-type fixing device arranged at the lower part of the grid connection node. The automatic guidance, precise positioning and temporary fixation during the hoisting process are achieved through a wedge-shaped slider, a compression spring and a keyway limiting structure. The shortcomings of the existing technology such as reliance on temporary bolt connection or welding operations resulting in low efficiency, the need for manual auxiliary positioning and fixation after hoisting, high operation risks, and the inability to quickly unhook and transfer to the next process are overcome.

[0069] When implementing this application, the key points are as follows: A shell-type temporary fixing device welded to the bottom of the inverted cone at the bottom of the grid connection node achieves rapid connection and temporary fixation between the offshore photovoltaic grid and the pile foundation. The pile foundation is equipped with a ring plate and a guide plate at the top, with reinforcing ribs between them to enhance structural stability. The connection node is connected to the grid via a semicircular welded ball, and the lower inverted cone is used for positioning. The temporary fixing device includes a guide portion, a telescopic locking portion, and a support limit portion, forming an integrated automatic locking mechanism.

[0070] The working principle of this application is as follows: Figure 5 During the hoisting process, the temporary fixing device at the bottom of the connection node descends with the grid as a whole. First, the guide part is aligned and inserted into the through hole between the guide plate and the ring plate at the top of the pile foundation. During the continued descent, the telescopic locking part is squeezed and automatically contracts. After passing through the ring plate, it automatically resets and pops out under the action of the compression spring, so that the support limit part and the telescopic locking part form limits on the upper and lower end surfaces of the ring plate respectively, completing precise positioning and temporary fixation.

[0071] The entire process requires no manual assistance and relies on the structure's own guidance, compression and reset mechanisms to achieve fast, safe and automatic positioning and locking of the grid. The device significantly improves the efficiency and safety of offshore photovoltaic hoisting construction and adapts to the needs of automated construction in harsh environments.

[0072] Specifically, in one embodiment of the present application, the temporary fixing device 2 includes a housing 21 and at least one wedge-shaped slider 22. The wedge-shaped slider 22 is limited and positioned by a key block compression spring 24, a key block 25, and a keyway guide rail 26. The slider compression spring 23 is used to resist and squeeze the wedge-shaped slider 22.

[0073] The shell 21 is positioned in the steel pipe pile 11 by chamfering and cooperating with the guide plate 14. When the grid 4 is hoisted into place, the wedge-shaped slider 22 pops out to abut the ring plate 12, thereby limiting and temporarily fixing the grid 4 to the pile foundation 1.

[0074] A moving pair is provided between the key block 25 and the keyway guide rail 26; the moving pair is equipped with two limit structures for limiting the movement limit position of the moving pair so that the wedge-shaped slider 22 cannot escape from the housing 21 or over-compress the slider compression spring 23;

[0075] The bottom of the shell 21 is provided with a chamfered structure, which is used to guide the shell 21 along the guide plate 14 into the interior of the steel pipe pile 11 during the hoisting process, thereby realizing automatic guidance and positioning of the assembly; the inverted cone 32 cooperates with the guide plate 14 to guide and limit, guiding the shell 21 into the target position of the pile foundation 1 during the hoisting process;

[0076] During the hoisting process, the temporary fixing device 2 achieves initial centering and guidance through the cooperation between the inverted cone 32 and the guide plate 14. Subsequently, the shell 21 further cooperates with the guide plate 14 with the help of its bottom chamfered structure to achieve rapid insertion into the steel pipe pile 11. During the downward pressure process, the ring plate 12 applies axial extrusion force to the wedge slider 22 in the shell 21. Driven by the key block 25, the wedge slider 22 slides radially along the keyway guide rail 26, compressing the slider and compressing the spring 23. After completely passing through the ring plate 12, the compressed spring automatically resets, causing the wedge slider 22 to quickly pop out and abut against the bottom surface of the ring plate 12, achieving vertical stop. Through the moving auxiliary structure of the key block and the guide rail, and the provision of a limit structure, the movement range of the wedge slider is controlled to avoid locking failure due to the slider falling off or excessive compression. This structural design makes the temporary fixing process independent of human operation, with accurate positioning and reliable reset, ensuring that the goal of efficient, safe, and stable temporary fixing during hoisting can still be achieved in complex offshore environments.

[0077] Specifically, in one embodiment of the present application, the wedge-shaped slider 22 contacts the guide plate 14 during the positioning and installation of the grid 4 and slides into the shell 21, so that the slider compression spring 23 is compressed. When the positioning and installation are completed, under the elastic force of the slider compression spring 23, the wedge-shaped slider 22 pops outward to achieve the limitation and temporary fixation of the upper grid 4; the keyway guide rail 26 is provided on the inner wall of the shell 21, which is used to limit the pop-up stroke of the wedge-shaped slider 22 and prevent the wedge-shaped slider 22 from separating from the outer shell structure of the shell 21; the key block 25 is installed on the top of the wedge-shaped slider 22, and the keyway guide rail 26 cooperates with the keyway compression spring 24 to limit the radial movement of the wedge-shaped slider 22 in the guide rail to prevent it from excessively shrinking or rebounding, thereby ensuring structural stability; the inverted cone 32 is provided at the lower part of the connection node 3 and is used to be welded to the temporary fixing device 2 after installation. The inverted cone 32 plays a guiding and positioning role during the hoisting process. After the grid 4 falls into place, its top is welded to the top of the steel pipe pile 11 to form a permanent fixed connection;

[0078] Eight reinforcing ribs 13 are evenly distributed circumferentially between the ring plate 12 and the guide plate 14; eight wedge-shaped sliders 22 are evenly distributed circumferentially on the housing 21;

[0079] The resulting implementation structure forms a collaborative working mechanism during installation: the inverted cone 32 achieves initial alignment through the limiting fit of the guide plate 14, guiding the shell 21 into the steel pipe pile 11. As the grid 4 gradually falls into place, the ring plate 12 contacts the wedge-shaped slider 22 on the shell 21 and compresses the slider's compression spring 23, causing the slider to slide axially inward along the keyway guide 26. After installation, the slider is driven outward by elastic force to a preset limit position. Its ejection amount is controlled by the keyway guide 26 and the key block 25, ensuring that the slider does not fall out of the shell, ensuring both locking reliability and preventing structural failure. The eight reinforcing ribs 13 provided between the ring plate 12 and the guide plate 14 enhance the overall strength and deformation resistance of the pile top structure, adapting to the eight evenly distributed wedge-shaped sliders 22 on the shell 21 to ensure uniform force and stable positioning of the structure, improving the automation, accuracy, and resistance to sea disturbances of the lifting, and ultimately achieving efficient, safe, and manual temporary fixation and subsequent permanent connection operations.

[0080] Specifically, in one embodiment of the present application, the ring plate 12 and the guide plate 14 are welded to the top of the steel pipe pile 11, and eight reinforcing ribs 13 are arranged at equal intervals along the circumferential direction between the ring plate 12 and the guide plate 14 to enhance the bending and torsional rigidity of the overall structure, thereby improving the connection stability and bearing capacity. After the grid 4 is hoisted, the inverted cone 32 is welded to the top of the steel pipe pile 11 to achieve permanent fixation. When the grid 4 is pulled up by wind suction, the wedge-shaped slider 22 contacts the ring plate 12 to form an upward force path, thereby transferring the load to the pile foundation 1.

[0081] This forms a structural system that combines the functions of initial guidance, temporary locking, and permanent fixation. Specifically, the reinforcing ribs 13 are evenly distributed between the ring plate 12 and the guide plate 14 to ensure that the grid 4 will not deflect or deform under the action of the guide plate 14 during the lifting process, providing a stable matching foundation for the shell 21 and its wedge-shaped slider 22. The wedge-shaped slider 22 is constrained by the compression spring 23 to achieve controllable contraction during the positioning stage, and automatically pops out after positioning is completed, forming a clamping lock on the upper and lower ends of the ring plate 12. When wind load causes the grid 4 to pull up, the contact surface between the slider 22 and the ring plate 12 provides anti-pullout support, and through structural coordination, a complete force closed loop is formed, which effectively transmits the upward pulling force to the interior of the steel pipe pile 11, preventing the connection from loosening or falling out, and improving the structural safety and reliability of offshore operation. Through this design, the system has good construction convenience, a high degree of operation automation, and stable load-bearing performance during service.

[0082] Specifically, in one embodiment of the present application, a connection node 3 is provided at the lower end of the support rod of the grid 4, and the connection node 3 is used to support the grid 4. A temporary fixing device 2 is welded at the lower part of the connection node 3, so that after the grid 4 is hoisted and dropped into the pile foundation 1, the grid 4 can be fixed on the pile foundation 1 through the temporary fixing device 2;

[0083] The main body of the pile foundation 1 is a steel pipe pile 11. A ring plate 12 and a guide plate 14 are welded near the top of the steel pipe pile 11. At the same time, in order to increase the strength and stability of the structure, eight reinforcing ribs 13 are evenly distributed in the circumferential direction between the ring plate 12 and the guide plate 14.

[0084] A semicircular welding ball 31 is provided on the upper part of the connection node 3. The semicircular welding ball 31 is used to connect with the support rod of the grid 4. An inverted cone 32 is provided on the lower part of the semicircular welding ball 31 to play a guiding and positioning role during hoisting and installation. A temporary fixing device 2 is welded at the bottom of the inverted cone 32.

[0085] The main body of the temporary fixing device 2 is a housing 21. Eight wedge-shaped sliders 22 are evenly installed in the circumferential direction of the housing 21. The positions of the wedge-shaped sliders 22 are determined by key block compression springs 24, key blocks 25, and keyway guide rails 26. At the same time, the slider compression springs 23 automatically reset the wedge-shaped sliders 22.

[0086] The process of installing the wedge-shaped slider 22 into the housing 21 is as follows: first, the slider compression spring 23 is placed into the spring groove inside the housing 21, and then the key block compression spring 24 and the key block 25 are pressed into the groove at the top of the wedge-shaped slider 22. Then, the wedge-shaped slider 22 is pressed into the housing 21 by compressing the slider compression spring 23. As the wedge-shaped slider 22 slides in, the key block compression spring 24 will bounce the key block 25 into the keyway guide rail 26, completing the installation of the wedge-shaped slider 22.

[0087] After the grid 4 is hoisted into place, the wedge-shaped slider 22 and the ring plate 12 play a role in limiting and fixing the grid 4. When subjected to negative wind loads, the grid 4 as a whole is subjected to upward wind suction. If the load exceeds the deadweight of the upper grid 4, the grid 4 will tend to move upward. At this time, the wedge-shaped slider 22 contacts the ring plate 12, transferring the excess load to the pile foundation 1, causing the pile foundation 1 to be subjected to an upward pulling force, which is eventually transferred to the foundation. This avoids the risk of the upper grid 4 being blown over by the wind load. At the same time, the crane ship can be unhooked in time after hoisting into place to carry out other hoisting operations. Finally, the top of the steel pipe pile 11 is welded to the inverted cone 32 as a permanent fixation method.

[0088] When the grid 4 is hoisted and dropped, the shell 21 first enters the interior of the pile foundation 1. The chamfered bottom of the shell 21 enables it to fall into the center position of the pile foundation 1 along the guide plate 14, ensuring the precise positioning and installation of the structure.

[0089] After the lifting is continued, the wedge-shaped slider 22 begins to contact the guide plate 14. After receiving the contact force of the guide plate 14, the wedge-shaped slider 22 slides inward and compresses the slider compression spring 23.

[0090] After the grid 4 is hoisted and dropped into place, that is, when the inverted cone 32 is completely in contact with the top of the steel pipe pile 11, the wedge-shaped slider 22 is no longer squeezed by the guide plate 14. Under the action of the slider compression spring 23, the wedge-shaped slider 22 will be ejected, thereby limiting and temporarily fixing the upper grid 4.

[0091] During the ejection of the wedge-shaped slider 22 , the keyway guide rail 26 limits the wedge-shaped slider 22 to prevent it from ejecting from the housing 21 .

[0092] A key block 25 is mounted on the top of the wedge-shaped slider 22. The key block 25 can only move within the keyway guide rail 26, thereby limiting the movement of the wedge-shaped slider 22 and preventing the wedge-shaped slider 22 from moving outward and ejecting from the housing 21. At the same time, it also prevents the wedge-shaped slider 22 from moving inward and compressing the slider compression spring 23, causing it to lose its elasticity.

[0093] The temporary fixing device for the offshore photovoltaic grid of the present invention has a simple structure and does not change the original structure of the offshore photovoltaic grid. It only requires welding the ring plate 12 and the guide plate 14 on the top of the steel pipe pile 11, and welding the temporary fixing device 2 on the bottom plate of the original inverted cone 32. At the same time, the temporary fixing device 2 is a purely mechanical structure, has low precision requirements, and is simple to manufacture.

[0094] The function of the device of the invention is simple to implement. During the lifting and falling process, the wedge-shaped slider 22 automatically slides inward under the action of gravity, and finally automatically pops out of the fixed structure under the action of the slider compression spring 23. No additional human operation is required, avoiding the impact of high risks in offshore operations.

[0095] Specifically, in one embodiment of the present application, under the effect of the technical solution of the present application, the upper grid 4 can be temporarily fixed on the pile foundation, and can be unhooked after the crane ship completes the lifting, and the next grid can be hoisted and installed or other operations can be carried out. There is no need to wait for welding fixation or initial tightening of bolts before unhooking and evacuating, which can greatly improve the operating efficiency of the crane ship;

[0096] The crane vessel can save 2-3 hours on each truss installation compared to bolted connections and 4-5 hours compared to welded connections. The average daily lifting capacity per crane vessel is expected to increase from 4-6 trusses to 10-12, significantly improving offshore construction and installation efficiency, thereby reducing offshore construction costs and increasing efficiency for project construction.

[0097] In general, the present invention aims to solve technical problems such as positioning difficulties, low temporary fixation efficiency, insufficient wind resistance and complicated manual operation in the process of hoisting offshore photovoltaic grids, and proposes a photovoltaic grid temporary fixation device with simple structure, convenient operation, automatic guidance and temporary fixation, and adaptability to complex offshore environments. Precise alignment is achieved by setting an inverted cone and a guide plate, and rapid resetting and limited fixation are achieved by using a wedge-shaped slider and a compression spring assembly, thereby effectively improving the efficiency and safety of grid hoisting, significantly reducing construction costs and improving the overall engineering benefits of offshore operations.

[0098] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A temporary fixing device for an offshore photovoltaic grid, used to connect a grid (4) and a pile foundation (1), characterized in that: include: connecting nodes (3) and temporary fixing devices (2); The pile foundation (1) comprises a steel pipe pile (11), a pile top of which is provided with a ring plate (12) and a guide plate (14), and at least two reinforcing ribs (13) are provided between the ring plate (12) and the guide plate (14); A semicircular welding ball (31) is provided on the upper portion of the connection node (3), and an inverted cone (32) is provided on the lower portion. A temporary fixing device (2) is welded to the bottom of the inverted cone (32); The temporary fixing device (2) comprises a guiding portion, a telescopic locking portion, and a supporting limiting portion; The guide portion is used to guide the telescopic locking portion to pass through the ring plate (12); the telescopic locking portion contracts after being squeezed by the ring plate (12); and resets and pops out after the squeezing is released, so that the support limiting portion is limited at one end surface of the ring plate (12) and the telescopic locking portion is limited at the other end surface of the ring plate (12).

2. A temporary fixing device for offshore photovoltaic grid according to claim 1, characterized in that: The temporary fixing device (2) comprises a housing (21) and at least one wedge-shaped slider (22). The wedge-shaped slider (22) is limited and positioned by a key block compression spring (24), a key block (25) and a keyway guide rail (26). The slider compression spring (23) is used to resist and squeeze the wedge-shaped slider (22).

3. The temporary fixing device for offshore photovoltaic grid according to claim 1, characterized in that: The shell (21) is positioned in the steel pipe pile (11) by chamfering and matching the guide plate (14). When the grid (4) is hoisted into place, the wedge-shaped slider (22) pops out to contact the ring plate (12), thereby achieving the positioning and temporary fixation of the grid (4) to the pile foundation (1).

4. A temporary fixing device for offshore photovoltaic grid as claimed in claim 2, characterized in that: A moving pair is provided between the key block (25) and the keyway guide rail (26); the moving pair is equipped with two limiting structures for limiting the moving limit position of the moving pair so that the wedge-shaped slider (22) cannot escape from the housing (21) or the slider compression spring (23) is over-compressed.

5. The temporary fixing device for offshore photovoltaic grid according to claim 3, characterized in that: The bottom of the shell (21) is provided with a chamfered structure, which is used to guide the shell (21) along the guide plate (14) into the interior of the steel pipe pile (11) during the hoisting process, thereby realizing automatic guided positioning of the component; the inverted cone (32) cooperates with the guide plate (14) to be used for guiding and limiting, thereby guiding the shell (21) into the target position of the pile foundation (1) during the hoisting process.

6. The temporary fixing device for offshore photovoltaic grid according to claim 2, characterized in that: During the positioning and installation process of the grid frame (4), the wedge-shaped slider (22) contacts the guide plate (14) and slides into the housing (21), causing the slider compression spring (23) to be compressed. When the positioning and installation is completed, under the elastic force of the slider compression spring (23), the wedge-shaped slider (22) pops outward, thereby achieving the limitation and temporary fixation of the upper grid frame (4).

7. A temporary fixing device for offshore photovoltaic grid as claimed in claim 6, characterized in that: A keyway guide rail (26) is arranged on the inner wall of the housing (21) and is used to limit the ejection stroke of the wedge-shaped slider (22) to prevent the wedge-shaped slider (22) from escaping from the outer shell structure of the housing (21).

8. The temporary fixing device for offshore photovoltaic grid according to claim 4, characterized in that: The key block (25) is installed on the top of the wedge-shaped slider (22), and the key block compression spring (24) cooperates with the keyway guide rail (26) to limit the wedge-shaped slider (22) to move in the radial direction in the guide rail, preventing it from excessively shrinking or rebounding, thereby ensuring structural stability.

9. The temporary fixing device for offshore photovoltaic grid according to claim 1, characterized in that: The inverted cone (32) is arranged at the lower part of the connection node (3) and is used for welding connection with the temporary fixing device (2) after installation. The inverted cone (32) plays a guiding and positioning role during the hoisting process. After the grid (4) falls into place, its top is welded to the pile top of the steel pipe pile (11) to form a permanent fixed connection.

10. The temporary fixing device for offshore photovoltaic grid according to claim 1, characterized in that: Eight reinforcing ribs (13) are evenly distributed in the circumferential direction between the ring plate (12) and the guide plate (14); eight wedge-shaped sliders (22) are evenly distributed in the circumferential direction on the shell (21); the ring plate (12) and the guide plate (14) are welded to the top of the steel pipe pile (11); after the grid (4) is hoisted, the inverted cone (32) is connected to the top of the steel pipe pile (11) by welding to achieve permanent fixation; when the grid (4) is pulled upward by wind suction, the wedge-shaped sliders (22) contact the ring plate (12) to form an upward force path, thereby transferring the load to the pile foundation (1).

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