Welded structure of offshore photovoltaic grid and pile foundation

Abstract

This disclosure provides a welded structure for an offshore photovoltaic (PV) grid and pile foundation. The welded structure includes: a pile foundation, a connecting component, and the PV grid. The pile foundation includes a first end and a second end, which are opposite to each other. The first end is used to fix the structure in the sea, and the second end is used to extend above the sea surface. The connecting component includes a hinged support, an upper flange, and a lower flange. The hinged support includes an upper support and a lower support that are hinged together. The lower support is welded to the top of the upper flange, and the upper flange is connected to the lower flange. The lower flange is connected to the pile foundation. The upper flange is provided with multiple reinforcing plates, which connect the upper flange and the lower support and are welded to the upper flange and the lower support. The PV grid is mounted on the upper support, which improves the connection strength.

Description

Technical Field

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

[0002] For offshore power generation projects, achieving a stable connection between large components and pile foundations is a relatively difficult engineering challenge. In addition to facilitating the connection between large components and pile foundations, it is necessary to further ensure the connection strength between the large components and pile foundations to avoid safety issues and ensure sufficient service life.

[0003] However, there is currently no field for offshore photovoltaic projects. How to achieve a stable connection between the photovoltaic grid and the pile foundation at sea to support the normal operation of offshore photovoltaic projects is the key and difficult point of these projects, and it is also one of the essential tasks that must be ensured during construction.

[0004] 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. Utility Model Content

[0005] The purpose of this disclosure is to provide a welded structure for offshore photovoltaic grids and pile foundations that improves connection strength.

[0006] According to one aspect of this disclosure, a welded structure for an offshore photovoltaic grid and pile foundation is provided, the welded structure comprising:

[0007] A pile foundation, the pile foundation comprising opposite first and second ends, the first end being fixed in the sea and the second end being extended above the sea surface;

[0008] A connecting assembly includes a hinged support, an upper flange, and a lower flange. The hinged support includes an upper support and a lower support hinged together. The lower support is welded to the top of the upper flange. The upper flange is connected to the lower flange, and the lower flange is connected to the pile foundation. The upper flange is provided with multiple reinforcing plates, which connect the upper flange and the lower support and are welded to the upper flange and the lower support.

[0009] A photovoltaic grid frame, wherein the photovoltaic grid frame is mounted on the upper support.

[0010] In one exemplary embodiment of this disclosure, the plurality of reinforcing plates are distributed in a circumferential ring around the lower support, and the included angle between two adjacent reinforcing plates is the same.

[0011] In one exemplary embodiment of this disclosure, the bottom of the reinforcing plate is welded to the top surface of the upper flange, and the sidewall of the reinforcing plate is welded to the outer peripheral surface of the lower support.

[0012] In one exemplary embodiment of this disclosure, one end of the reinforcing plate is connected to the outer peripheral surface of the lower support in the radial direction of the upper flange, and the other end of the reinforcing plate extends to the edge of the upper flange.

[0013] In one exemplary embodiment of this disclosure, the height of the reinforcing plate is the same as the height of the lower support in the thickness direction of the upper flange.

[0014] In one exemplary embodiment of this disclosure, the upper flange is provided with a socket-type connector, the lower flange is provided with a socket hole, the second end of the pile foundation is provided with a receiving space, and the socket-type connector extends into the receiving space through the socket hole.

[0015] In one exemplary embodiment of this disclosure, the shape and size of the socket match the shape and size of the cross-section of the socket connector perpendicular to the axial direction of the upper flange.

[0016] In one exemplary embodiment of this disclosure, the gap between the socket-type connector and the sidewall of the receiving space along the radial direction of the pile foundation is less than 20 mm.

[0017] In one exemplary embodiment of this disclosure, the lower flange is provided with a plurality of lower ribs, which connect the lower flange and the pile foundation, and are welded to the bottom surface of the upper flange and the outer peripheral surface of the pile foundation.

[0018] In one exemplary embodiment of this disclosure, the plurality of lower ribs are distributed around the circumference of the pile foundation, and the included angle between two adjacent lower ribs is the same.

[0019] The welded structure of the offshore photovoltaic grid and pile foundation disclosed herein features a pile foundation with its first end fixed deep into the sea, fully utilizing seabed geological conditions to provide stable foundation support for the entire structure. The seabed soil or rock can withstand the enormous load transmitted by the pile foundation, ensuring its stability without displacement or overturning under various external forces such as wave impact, sea wind, and the photovoltaic grid's own weight. The second end of the pile foundation extends above the sea surface, facilitating the subsequent installation of connecting components and the photovoltaic grid. The presence of hinged supports in the connecting components allows the entire structure a certain degree of deformation. In the complex marine environment, the direction and intensity of waves, currents, and sea winds are constantly changing, subjecting the photovoltaic grid to external forces from different directions. The hinged supports allow relative rotation between the upper and lower supports, enabling the photovoltaic grid to adapt to changes in the direction of external forces to a certain extent, avoiding excessive local stress caused by concentrated external forces, thereby protecting the structural integrity and extending its service life. The connection method of the upper and lower flanges provides reliable connection strength. By connecting the lower flange to the pile foundation, the upper flange to the lower flange, and then welding the lower support to the upper flange, a multi-layered connection system is formed. This connection method effectively transfers and distributes loads, ensuring that the load of the photovoltaic grid structure can be smoothly transferred to the pile foundation, and then to the seabed foundation. Furthermore, multiple reinforcing plates are installed on the upper flange, connecting and welding the upper flange to the lower support. The reinforcing plates further enhance the strength and stability of the connection components. They effectively suppress deformation of the upper flange and lower support under stress, preventing loosening or cracking at the connection. They distribute the load borne by the lower support more evenly onto the upper flange, reducing local stress concentration and thus improving the load-bearing capacity and connection strength of the entire connection structure. This allows the upper support to provide a stable support platform for the photovoltaic grid structure, enabling it to maintain a suitable height and angle for optimal solar energy reception. Simultaneously, through the stable connection of the connection components to the pile foundation, various loads borne by the photovoltaic grid structure can be effectively transferred to the pile foundation, ensuring its stable operation in harsh marine environments.

[0020] 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

[0021] 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.

[0022] Figure 1This is a schematic diagram of a welded structure for a photovoltaic grid and pile foundation provided in one embodiment of the present disclosure.

[0023] Figure 2 for Figure 1 A cross-sectional view at point AA.

[0024] Figure 3 for Figure 1 Cross-sectional view at BB.

[0025] Figure 4 This is a schematic diagram of a lower rib plate provided in one embodiment of the present disclosure.

[0026] Figure 5 This is a schematic diagram of a socket-type connector provided in one embodiment of the present disclosure.

[0027] Figure 6 This is a schematic diagram of a plug-in board provided in one embodiment of the present disclosure.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Pile foundation;

[0030] 20. Photovoltaic grid frame; 210. Fixed sphere; 220. Connecting pipe;

[0031] 30. Connecting assembly; 310. Hinge support; 311. Upper support; 312. Lower support; 313. Slide plate; 320. Upper flange; 330. Lower flange; 340. Lower rib; 350. Socket connector; 351. Plug plate; 360. Reinforcing plate; 370. Upper rib. Detailed Implementation

[0032] 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 their detailed description will be omitted.

[0033] 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.

[0034] 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.

[0035] This disclosure provides a welded structure for an offshore photovoltaic grid and pile foundation, such as... Figures 1-3 As shown, the welded structure of the offshore photovoltaic grid and pile foundation includes: pile foundation 10, connecting component 30 and photovoltaic grid 20. The pile foundation 10 includes a first end and a second end, which are opposite to each other. The first end is used to fix it in the sea, and the second end is used to extend above the sea surface. The connecting component 30 includes a hinged support 310, an upper flange 320 and a lower flange 330. The hinged support 310 includes an upper support 311 and a lower support 312 that are hinged together. The lower support 312 is welded to the top of the upper flange 320. The upper flange 320 is connected to the lower flange 330, and the lower flange 330 is connected to the pile foundation 10. The upper flange 320 is provided with a plurality of reinforcing plates 360. The plurality of reinforcing plates 360 connect the upper flange 320 and the lower support 312 and are welded to the upper flange 320 and the lower support 312. The photovoltaic grid 20 is located on the upper support 311 and is connected to the pile foundation 10 through the connecting component 30.

[0036] The welded structure of the offshore photovoltaic grid and pile foundation disclosed herein features a pile foundation 10 whose first end is fixed deep into the sea, fully utilizing seabed geological conditions to provide stable foundation support for the entire structure. The seabed soil or rock can withstand the enormous load transmitted by the pile foundation 10, ensuring its stability without displacement or overturning under various external forces such as wave impact, sea wind, and the weight of the photovoltaic grid 20 itself. The second end of the pile foundation 10 extends above the sea surface, facilitating the subsequent installation of the connecting components 30 and the photovoltaic grid 20. The presence of the hinged support 310 of the connecting components 30 allows the entire structure to have a certain amount of deformation. In the complex marine environment, the direction and intensity of waves, currents, and sea winds are constantly changing, subjecting the photovoltaic grid 20 to external forces from different directions. The upper support 311 and lower support 312 of the hinged support 310 can rotate relative to each other, allowing the photovoltaic grid 20 to adapt to changes in the direction of external forces to a certain extent, avoiding excessive local stress caused by concentrated external forces, thereby protecting the structural integrity and extending its service life. The connection between the upper flange 320 and the lower flange 330 provides reliable connection strength. By connecting the lower flange 330 to the pile foundation 10, connecting the upper flange 320 to the lower flange 330, and then welding the lower support 312 to the upper flange 320, a multi-layered connection system is formed. This connection method effectively transfers and distributes loads, ensuring that the load of the photovoltaic grid 20 can be smoothly transferred to the pile foundation 10, and then to the seabed foundation. Furthermore, the upper flange 320 is equipped with multiple reinforcing plates 360, which connect the upper flange 320 to the lower support 312 and are welded to both. The reinforcing plates 360 further enhance the strength and stability of the connection assembly 30. The reinforcing plates 360 can effectively suppress the deformation of the upper flange 320 and the lower support 312 under stress, preventing loosening or cracking at the connection point. These components enable a more even distribution of the load borne by the lower support 312 onto the upper flange 320, reducing localized stress concentration and thus improving the load-bearing capacity and connection strength of the entire connection structure. This allows the upper support 311 to provide a stable support platform for the photovoltaic grid 20, maintaining it at a suitable height and angle for optimal solar energy reception. Simultaneously, the stable connection between the connecting components 30 and the pile foundation 10 effectively transfers various loads borne by the photovoltaic grid 20 to the pile foundation 10, ensuring its stable operation in harsh marine environments.

[0037] like Figure 1As shown, the hinged support 310 includes an upper support 311, a lower support 312, and a sliding plate 313 located between the upper support 311 and the lower support 312. The sliding plate 313 may be made of plastic or metal. The hinged support 310 can be a spherical hinge support, and the sliding plate 313 is a spherical crown plate. Specifically, the spherical hinge support includes an upper support 311, a lower support 312, and a spherical crown plate located between the upper support 311 and the lower support 312. The upper support 311 and the lower support 312 can move relatively within a small range through the spherical crown plate, thereby absorbing the movement of the photovoltaic grid 20 relative to the pile foundation 10. This transforms the rigid connection structure connecting the photovoltaic grid 20 and the pile foundation 10 into a flexible connection structure with a certain deformation allowance, thereby improving the seismic performance between the photovoltaic grid 20 and the pile foundation 10, and thus enhancing the connection strength and reliability. It should be noted that this disclosure does not limit the type and specific structure of the hinged support 310, and it can be other seismic-resistant supports.

[0038] The spherical hinge support can have a height of 135mm, the upper support 311 can have a width of 550mm, the lower support 312 can have a width of 450mm, the width of the extended portion of the upper support 311 can have a width of 136mm, and the height of the lower support 312 can have a height of 97mm.

[0039] like Figure 1 As shown, the photovoltaic grid frame 20 includes a fixed ball 210 and a connecting pipe 220. The connecting pipe 220 is welded to the fixed ball 210, and the fixed ball 210 is fixedly mounted on the upper support 311 via an upper rib plate 370. The fixed ball 210 and the upper rib plate 370 can be fixedly connected by welding.

[0040] The outer diameter of the fixed ball 210 can be 500mm and the inner diameter can be 400mm; the diameter of the connecting tube 220 can be 250mm.

[0041] Multiple reinforcing plates 360 are distributed circumferentially around the lower support 312, with adjacent reinforcing plates 360 forming the same angle. This uniform circumferential distribution of the reinforcing plates 360 ensures the uniformity of stress on the lower support 312 in all directions. In a marine environment, the direction of external forces acting on the photovoltaic grid 20 varies randomly and may originate from various directions. If the reinforcing plates 360 are not evenly distributed, some parts will experience excessive stress while others will experience insufficient stress, thus affecting the stability and reliability of the entire connection structure. By ensuring the uniform distribution of the reinforcing plates 360, regardless of the direction from which external forces act on the photovoltaic grid 20, the reinforcing plates 360 can effectively distribute the load, avoiding localized stress concentration. Furthermore, the uniformly distributed reinforcing plates 360 also enhance the overall stiffness and torsional resistance of the connecting assembly 30. When subjected to torsional force, the evenly distributed reinforcing plates 360 can work together to resist torsion, prevent the connecting assembly 30 from twisting and deforming, and ensure a stable and reliable connection between the lower support 312 and the upper flange 320.

[0042] The bottom of the reinforcing plate 360 ​​is welded to the top surface of the upper flange 320, and the side wall of the reinforcing plate 360 ​​is welded to the outer peripheral surface of the lower support 312. This welding provides a robust connection structure between the reinforcing plate 360, the upper flange 320, and the lower support 312. Welding the bottom of the reinforcing plate 360 ​​to the top surface of the upper flange 320 allows the reinforcing plate 360 ​​to effectively transfer the load from the lower support 312 to the upper flange 320, enhancing the upper flange 320's load-bearing capacity under vertical loads. Simultaneously, this welding method also limits the vertical deformation of the upper flange 320, improving its stability. Welding the side wall of the reinforcing plate 360 ​​to the outer peripheral surface of the lower support 312 further strengthens the connection between the lower support 312 and the upper flange 320. This effectively prevents horizontal displacement or rotation of the lower support 312 relative to the upper flange 320, ensuring the normal operation of the hinged support 310. In addition, in the marine environment, the connecting component 30 is subject to periodic external forces such as waves and sea winds, which can easily cause fatigue failure. By welding the reinforcing plate 360 ​​to the upper flange 320 and the lower support 312, stress can be dispersed and stress concentration can be reduced, thereby reducing the risk of fatigue failure and extending the service life of the connecting structure.

[0043] In the radial direction of the upper flange 320, one end of the reinforcing plate 360 ​​connects to the outer peripheral surface of the lower support 312, while the other end extends to the edge of the upper flange 320. This increases the structural strength provided by the reinforcing plate 360, thereby enhancing the connection strength between the lower support 312 and the upper flange 320. The extension of the reinforcing plate 360 ​​to the edge of the upper flange 320 effectively disperses stress at this location, improving the strength and reliability of the connection. When the upper flange 320 is subjected to load, it will undergo some bending deformation. The extension of the reinforcing plate 360 ​​to the edge of the upper flange 320 effectively suppresses this bending deformation, maintaining good shape and dimensional accuracy, thus ensuring the normal operation of the connecting assembly 30 and the stable installation of the photovoltaic grid 20.

[0044] In this design, the height of the reinforcing plate 360 ​​is the same as the height of the lower support 312 along the thickness direction of the upper flange 320. When the connecting assembly 30 is subjected to external forces, the reinforcing plate 360 ​​and the lower support 312 can share the load within the same height range, avoiding uneven local stress. This identical height design allows the reinforcing plate 360 ​​to better assist the lower support 312 in transferring loads, enhancing the vertical load-bearing capacity of the entire connection structure. Manufacturing the reinforcing plate 360 ​​and the lower support 312 according to a unified height standard reduces processing complexity and errors. During installation, it is also easier to ensure the matching and connection quality between the reinforcing plate 360 ​​and the lower support 312, improving construction efficiency and installation accuracy. Of course, the heights of the reinforcing plate 360 ​​and the lower support 312 can also differ; this disclosure does not impose any restrictions on this.

[0045] The width of the reinforcing plate 360 ​​can be 245mm, the height of the reinforcing plate 360 ​​can be 97mm, and the thickness of the reinforcing plate 360 ​​can be 20mm.

[0046] The upper flange 320 can have a diameter of 940mm, and the lower flange 330 can have a diameter of 1100mm; the upper flange 320 can have a thickness of 40mm, and the lower flange 330 can have a thickness of 30mm.

[0047] like Figure 1 and Figure 3As shown, the lower flange 330 is provided with multiple lower ribs 340. These lower ribs 340 connect the lower flange 330 to the pile foundation 10 and are welded to the bottom surface of the upper flange 320 and the outer circumferential surface of the pile foundation 10. The lower ribs 340 further enhance the connection strength and stability between the lower flange 330 and the pile foundation 10. The lower ribs 340 can effectively disperse the stress at the connection between the lower flange 330 and the pile foundation 10, avoiding stress concentration. Through welding to the bottom surface of the lower flange 330 and the outer circumferential surface of the pile foundation 10, the lower ribs 340 form a stable triangular structure, effectively transferring the load from the lower flange 330 to the pile foundation 10, improving the load-bearing capacity and deformation resistance of the connection. Simultaneously, the presence of the lower ribs 340 also increases the stiffness of the connection, reducing deformation caused by external forces. In addition, when subjected to torsional force, the lower rib plate 340 can work together to resist torsion, prevent relative rotation between the lower flange 330 and the pile foundation 10, ensure the stability of the entire connection structure, and guarantee the stability of the connection between the photovoltaic grid 20 and the pile foundation 10.

[0048] Multiple lower ribs 340 are distributed around the circumference of the pile foundation 10, with adjacent lower ribs 340 having the same included angle. The uniformly distributed lower ribs 340 ensure the uniform stress distribution between the lower flange 330 and the pile foundation 10 in all directions. The uniform distribution also enhances the overall stability and deformation resistance of the connection structure. When subjected to external forces such as sea winds and waves, the uniformly distributed lower ribs 340 work together to prevent deformation of the connection structure and ensure the reliability of the connection between the photovoltaic grid 20 and the pile foundation 10.

[0049] Among them, such as Figure 4 As shown, the lower rib plate 340 can be in the form of a trapezoidal structure. The height of the side of the lower rib plate 340 that is welded to the pile foundation 10 can be 700mm, the height of the opposite side can be 300mm, the width of the top can be 150mm, the width of the bottom can be 30mm, the height of the inclined side connecting the bottom and the side can be 200mm and the width can be 120mm, and the thickness of the lower rib plate 340 can be 20mm.

[0050] like Figure 1 , Figure 3 and Figure 5As shown, the upper flange 320 is equipped with a socket-type connector 350, the lower flange 330 has a socket, and the second end of the pile foundation 10 has a receiving space. The socket-type connector 350 extends into the receiving space through the socket. During installation, the socket-type connector 350 can be accurately inserted into the socket of the lower flange 330 and the receiving space of the pile foundation 10, ensuring the accurate relative positions of the upper flange 320, lower flange 330, and pile foundation 10. Through the cooperation between the socket-type connector 350, the socket, and the receiving space, the load transmitted from the photovoltaic grid 20 can be transferred from the lower flange 330 to the pile foundation 10. This connection method can withstand large axial and lateral loads, improving the load-bearing capacity of the connection structure. In addition, when it is necessary to repair or replace the photovoltaic grid 20 or the connecting components 30, the socket-type connector 350 can be pulled out relatively easily for the corresponding operations. This reduces maintenance costs and difficulty, and improves the maintainability and economy of offshore photovoltaic projects.

[0051] The shape and size of the socket are matched with the shape and size of the cross-section of the socket-type connector 350 along the axis perpendicular to the upper flange 320. This ensures that the socket-type connector 350 can be tightly inserted and pass through the socket, thereby ensuring that the socket-type connector 350 is firmly locked in the predetermined position after insertion and will not easily fall off or shift due to external forces. Furthermore, in marine environments, where the connection structure is subjected to frequent vibrations and impacts, a smaller gap can reduce stress concentration and wear, lower the risk of fatigue failure, and extend the service life of the connection structure. At the same time, it allows construction personnel to more easily insert the socket-type connector 350 into the socket, reducing adjustment and correction work during installation and ensuring that the connection structure can be installed accurately according to design requirements.

[0052] The socket-type connector 350 further comprises eight plug-in plates 351, with an included angle of 45° between two adjacent plug-in plates 351. The plug-in plates 351 can be plate-shaped, for example, they can be flat plates. Of course, the number of plug-in plates 351 can also be three, four, five, or more; this disclosure does not limit this. Specifically, the gap between the socket-type connector 350 and the sidewall of the receiving space along the radial direction of the pile foundation 10 is less than 20 mm, for example, 20 mm, 18 mm, 16 mm, 15 mm, 13 mm, 10 mm, etc., which are not listed here. Controlling the gap between the socket-type connector 350 and the sidewall of the receiving space along the radial direction of the pile foundation 10 to within 20 mm can effectively improve the lateral displacement resistance and overall stiffness of the connection structure, ensuring a firm and reliable connection between the photovoltaic grid 20 and the pile foundation 10.

[0053] Among them, such as Figure 6As shown, the plug-in board 351 can be in the form of a trapezoidal structure. The height of the inner side of the plug-in board 351 can be 530mm, the height of the opposite outer side can be 130mm, the width of the top can be 362mm, the width of the bottom can be 62mm, the height of the inclined side connecting the bottom and the outer side can be 400mm, and the thickness of the plug-in board 351 can be 20mm.

[0054] 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 welded structure for an offshore photovoltaic grid and pile foundation, characterized in that, include: A pile foundation, the pile foundation comprising opposite first and second ends, the first end being fixed in the sea and the second end being extended above the sea surface; A connecting assembly includes a hinged support, an upper flange, and a lower flange. The hinged support includes an upper support and a lower support hinged together. The lower support is welded to the top of the upper flange. The upper flange is connected to the lower flange, and the lower flange is connected to the pile foundation. The upper flange is provided with multiple reinforcing plates, which connect the upper flange and the lower support and are welded to the upper flange and the lower support. A photovoltaic grid frame, wherein the photovoltaic grid frame is mounted on the upper support.

2. The welded structure according to claim 1, characterized in that, The plurality of reinforcing plates are distributed in a circle around the lower support, and the included angle between two adjacent reinforcing plates is the same.

3. The welded structure according to claim 1, characterized in that, The bottom of the reinforcing plate is welded to the top surface of the upper flange, and the side wall of the reinforcing plate is welded to the outer peripheral surface of the lower support.

4. The welded structure according to claim 1, characterized in that, In the radial direction of the upper flange, one end of the reinforcing plate is connected to the outer peripheral surface of the lower support, and the other end of the reinforcing plate extends to the edge of the upper flange.

5. The welded structure according to claim 1, characterized in that, In the thickness direction of the upper flange, the height of the reinforcing plate is the same as the height of the lower support.

6. The welded structure according to claim 1, characterized in that, The upper flange is provided with a socket-type connector, the lower flange is provided with a socket hole, and the second end of the pile foundation is provided with a receiving space. The socket-type connector extends into the receiving space through the socket hole.

7. The welded structure according to claim 6, characterized in that, The shape and size of the socket match the shape and size of the cross-section of the socket connector perpendicular to the axial direction of the upper flange.

8. The welded structure according to claim 6, characterized in that, On the circumference of the pile foundation, the gap between the socket connector and the sidewall of the receiving space along the radial direction of the pile foundation is less than 20 mm.

9. The welded structure according to claim 1, characterized in that, The lower flange is provided with multiple lower ribs, which connect the lower flange to the pile foundation and are welded to the bottom surface of the upper flange and the outer peripheral surface of the pile foundation.

10. The welded structure according to claim 9, characterized in that, The plurality of lower ribs are distributed around the circumference of the pile foundation, and the included angle between two adjacent lower ribs is the same.

Images