Construction method of inclined strut structure of offshore photovoltaic bolt-sphere net rack

Abstract

The invention discloses a construction method of an offshore photovoltaic bolt-sphere net rack inclined strut structure. The offshore photovoltaic bolt-sphere net rack inclined strut structure comprises a bolt-sphere net rack, four steel pipe piles and four pile top connecting assemblies. The upper ends of the four steel pipe piles are each connected with one pile top connecting assembly, and the upper ends of the four pile top connecting assemblies are connected with the bolt-sphere net rack; the bolt-sphere net rack comprises a plurality of upper chords, a plurality of lower chords, a plurality of web members, a plurality of upper bolt spheres and a plurality of lower bolt spheres; the construction method comprises the steps that S1, the bolt-sphere net rack, the steel pipe piles and the pile top connecting assemblies are prefabricated; s2, steel pipe piles are installed in a penetrating mode; s3, a prefabricated bolt-sphere net rack is mounted on the steel pipe piles; and S4, hoop inclined supports are installed on the steel pipe piles. The construction method of the inclined strut structure of the offshore photovoltaic bolt-sphere net rack is provided for overcoming the existing defects, and has the advantages of being efficient in assembly efficiency and convenient and fast to construct.

Description

Technical Field

[0001] The present invention relates to a construction method for a diagonal brace structure of a bolted spherical grid for offshore photovoltaic power generation. Background Art

[0002] With the growth of the demand for new energy installed capacity, coastal provinces in China have actively responded and successively issued various policy opinions to support the development of offshore photovoltaic power generation. At present, in some offshore photovoltaic projects, a bolted spherical grid structure is adopted as the form of the offshore photovoltaic support. The bolted spherical grid structure is composed of members and bolted spherical joints, and is a typical prefabricated structure, which has the characteristics of standardized design, modular products, factory production, mechanized assembly, and refined management. The accuracy and quality control of components are good, the processing and assembly speed is fast, the construction period is short, and it can meet the green building design and construction requirements of energy conservation, land conservation, water conservation, material conservation, and environmental protection to the greatest extent. It is a new direction for the form of offshore photovoltaic supports.

[0003] When the existing bolted spherical grid structure is used in the offshore environment, due to the large offshore wind load, especially in typhoon-prone areas, the following problems exist: If diagonal braces are not added on the pile tops, the upper bolted spherical grid has a large span, and large deflections will occur under the action of wind load, and the pile foundation will also bear a large bending moment. In order to meet the requirements of grid deflection and pile foundation bearing capacity, it is necessary to improve the mechanical properties of the grid and pile foundation by increasing the specifications of members and pile foundations, which will lead to a significant increase in the quantities of the grid and pile foundation; If diagonal braces are added on the pile tops, the support points of the upper grid structure can be increased, the grid deflection can be reduced, and at the same time, the diagonal brace structure can optimize the force of the pile foundation and reduce the bending moment borne by the pile foundation, significantly reducing the quantities of the upper bolted spherical grid and the lower pile foundation.

[0004] However, the scale of offshore photovoltaic projects is huge and the number of grids involved is numerous. In order to ensure the project progress, production tasks are usually assigned to multiple manufacturers. Since the transportation distance of the grids is far and the transportation cost is correspondingly high. For grids without diagonal braces, multiple grids can be transported at one time by stacking transportation, thus saving transportation costs. In contrast, grids with diagonal braces cannot meet the requirements of stacking transportation due to their high structural height. Therefore, during offshore transportation, only one bolted spherical grid can be transported at a time, which will lead to low transportation efficiency and high costs.

[0005] Therefore, in view of the above problems, a construction method for a diagonal brace structure of a bolted spherical grid for offshore photovoltaic power generation is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a construction method for a diagonal brace structure of a bolted spherical grid for offshore photovoltaic power generation, which has the advantages of high assembly efficiency and convenient construction.

[0007] To achieve the above object, the present invention provides the following technical solution: A construction method for a diagonal bracing structure of an offshore photovoltaic bolted spherical grid, the offshore photovoltaic bolted spherical grid diagonal bracing structure includes a bolted spherical grid, four steel pipe piles, and four groups of pile top connection components;

[0008] The upper ends of the four steel pipe piles are each connected to a group of the pile top connection components, and the upper ends of the four groups of pile top connection components are connected to the bolted spherical grid;

[0009] The bolted spherical grid includes multiple upper chord bars, multiple lower chord bars, multiple web members, multiple upper bolt balls, and multiple lower bolt balls;

[0010] Multiple upper chord bars are connected into a square mesh through multiple upper bolt balls, multiple lower chord bars are connected into a square mesh through multiple lower bolt balls, and multiple web members are obliquely arranged between the two square meshes and are respectively connected to the upper bolt balls and the lower bolt balls at both ends;

[0011] The pile top connection component includes a spherical connection seat, a partition plate, and a guiding section;

[0012] The spherical connection seat is connected to the lower bolt ball, the lower end of the spherical connection seat is connected to the partition plate, the lower end of the partition plate is connected to the guiding section, and the guiding section is inserted into the upper port of the steel pipe pile;

[0013] The pile top connection component further includes a hoop, four connecting steel plates, four bolt connecting plates, and four diagonal braces;

[0014] The hoop is connected to the upper end of the outer wall of the steel pipe pile, two connecting steel plates are respectively connected to both sides of the outer wall of the hoop, the lower ends of the four diagonal braces are each connected to a bolt connecting plate, the lower ends of two of the diagonal braces are connected to the connecting steel plates through the bolt connecting plates, and the lower ends of the other two diagonal braces are connected to the steel plate extended flange of the hoop through the bolt connecting plates; the upper ends of the four diagonal braces are connected to the corresponding lower bolt balls;

[0015] The construction method includes:

[0016] Step S1, prefabricate the bolted spherical grid, steel pipe piles, and pile top connection components;

[0017] Step S2, install the steel pipe piles;

[0018] Step S3, install the prefabricated bolted spherical grid on the steel pipe piles;

[0019] Step S4, install the hoop diagonal bracing on the steel pipe piles.

[0020] The said step S1, prefabricating the bolted spherical grid, steel pipe piles, and pile top connection components includes:

[0021] Step S11, prefabricate steel pipe piles in an onshore factory;

[0022] Step S12, prefabricate a prefabricated bolted spherical grid in an onshore factory. Connect multiple upper chord members into a square mesh through multiple upper bolted spheres, connect multiple lower chord members into a square mesh through multiple lower bolted spheres, and obliquely arrange multiple web members between the two square meshes, with both ends connected to the upper bolted sphere and the lower bolted sphere respectively;

[0023] Step S13, connect a pile top connection assembly to each of the four corners of the lower end face of each bolted spherical grid; connect a spherical connection seat and a partition on the lower bolted sphere, and connect a guiding section at the lower end of the partition;

[0024] Step S14, transport the prefabricated bolted spherical grid, steel pipe piles and pile top connection assemblies to the installation site by a transport barge.

[0025] The said step S2, installing the steel pipe piles includes:

[0026] Step S21, use a crane ship to lift the steel pipe pile with special pile lifting equipment and hoist it into the pile position fixing position of the process guiding frame. An adjustable hydraulic jack is arranged at the bottom of the guiding frame for fine-tuning the verticality of the pile body; after the steel pipe pile sinks a certain depth by its own weight, first use a vibrating hammer for steel pipe pile insertion and pile stabilization, and then use a hydraulic pile hammer for pile sinking. During the pile sinking process, control the relative position and verticality of the pile through the function of the positioning guiding frame, and monitor the verticality of the pile at any time until the pile sinking is completed.

[0027] The said step S3, installing the prefabricated bolted spherical grid on the steel pipe pile includes:

[0028] Step S31, use a crane ship to lift the bolted spherical grid as a whole, and insert the guiding section at the lower end of the pile top connection assembly into the upper port of the steel pipe pile;

[0029] Step S32, weld the partition at the upper end of the guiding section to the upper port of the steel pipe pile on site, so that the bolted spherical grid and the steel pipe pile are connected into a whole.

[0030] The said step S4, installing the hoop diagonal bracing on the steel pipe pile includes:

[0031] Step S41, use a small construction boat to install a hoop at the predetermined position of the steel pipe pile, and then connect the upper end of the diagonal bracing to the lower bolted sphere through the bolt of the tapered head section at the upper end of the diagonal bracing. The lower ends of two of the diagonal bracings are connected to the connecting steel plate through a bolt connecting plate, and the lower ends of the other two diagonal bracings are connected to the extended flange of the steel plate of the hoop through a bolt connecting plate; finally, a complete large-span bolted spherical grid structure with diagonal bracings is formed.

[0032] Preferably, when transporting the bolted spherical grid and the pile top connection assembly, set up a simple tooling on the transport barge and stack the bolted spherical grids for placement.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: The construction method of the inclined bracing structure of the offshore photovoltaic bolted spherical grid has high assembly efficiency and convenient construction characteristics; it is fixed by welding the pile top connection component to the steel pipe pile, ensuring the overall stability during construction. In addition, by adding inclined bracing connections, the bearing capacity of the bolted spherical grid and the pile foundation is enhanced. While enabling the bolted spherical grid foundation to bear greater loads, it can also reduce the amount of steel structure work. The installation of the inclined bracing can be carried out after the installation of the pile foundation and the upper bolted spherical grid. It is connected to the hoop through the bolt connecting plate, which reduces the height of the bolted spherical grid during offshore transportation, thereby enabling multiple bolted spherical grids to be transported simultaneously, effectively reducing the offshore transportation cost and enhancing the economy of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0035] Figure 1 is a schematic diagram of the construction method of the inclined bracing structure of the offshore photovoltaic bolted spherical grid of the present invention;

[0036] Figure 2 is a detailed view of step S1 of the construction method of the inclined bracing structure of the offshore photovoltaic bolted spherical grid of the present invention;

[0037] Figure 3 is a detailed view of step S2 of the construction method of the inclined bracing structure of the offshore photovoltaic bolted spherical grid of the present invention;

[0038] Figure 4 is a detailed view of step S3 of the construction method of the inclined bracing structure of the offshore photovoltaic bolted spherical grid of the present invention;

[0039] Figure 5 is a detailed view of step S4 of the construction method of the inclined bracing structure of the offshore photovoltaic bolted spherical grid of the present invention;

[0040] Figure 6 is an axonometric view of the novel inclined bracing structure of the offshore photovoltaic bolted spherical grid of the present invention;

[0041] Figure 7 is a side view of the novel inclined bracing structure of the offshore photovoltaic bolted spherical grid of the present invention;

[0042] Figure 8 is a top view of the novel pile top connection component of the present invention;

[0043] Figure 9 is a side view of the novel pile top connection component of the present invention;

[0044] Figure 10This is the front view of the novel pile top connection component of the present invention;

[0045] Figure 11 This is the axonometric view of the novel pile top connection component of the present invention;

[0046] Figure 12 This is the detail view of the novel hoop of the present invention.

[0047] In the figure: 1. Bolt ball grid; 11. Upper chord; 12. Lower chord; 13. Web member; 14. Upper bolt ball; 15. Lower bolt ball; 2. Steel pipe pile; 3. Pile top connection component; 31. Ball connection seat; 32. Partition plate; 33. Guide section; 34. Hoop; 35. Connection steel plate; 36. Bolt connection plate; 37. Diagonal brace; 38. Bolt. Specific implementation manners

[0048] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0049] Please refer to Figure 6-12 , a construction method for a diagonal brace structure of a bolt ball grid for offshore photovoltaic power generation. The diagonal brace structure of the bolt ball grid for offshore photovoltaic power generation includes a bolt ball grid 1, four steel pipe piles 2, and four groups of pile top connection components 3; the upper ends of the four steel pipe piles 2 are respectively connected to a group of pile top connection components 3, and the upper ends of the four groups of pile top connection components 3 are connected to the bolt ball grid 1;

[0050] Specifically, the bolt ball grid 1 includes multiple upper chords 11, multiple lower chords 12, multiple web members 13, multiple upper bolt balls 14, and multiple lower bolt balls 15; the multiple upper chords 11 are connected into a square mesh through the multiple upper bolt balls 14, the multiple lower chords 12 are connected into a square mesh through the multiple lower bolt balls 15, and the multiple web members 13 are obliquely arranged between the two square meshes and are respectively connected to the upper bolt balls 14 and the lower bolt balls 15 at both ends;

[0051] Specifically, the pile top connection component 3 includes a ball connection seat 31, a partition plate 32, and a guide section 33; the ball connection seat 31 is connected to the lower bolt ball 15, the lower end of the ball connection seat 31 is connected to the partition plate 32, the lower end of the partition plate 32 is connected to the guide section 33, and the guide section 33 is inserted into the upper port of the steel pipe pile 2;

[0052] Specifically, the pile top connection assembly 3 further includes a hoop 34, four connecting steel plates 35, two bolt connecting plates 36 and four diagonal braces 37; the hoop 34 is connected to the upper end of the outer wall of the steel pipe pile 2, and two connecting steel plates 35 are respectively connected to both sides of the outer wall of the hoop 34. The lower ends of the four diagonal braces 37 are each connected to a bolt connecting plate 36. The lower ends of two of the diagonal braces 37 are connected to the connecting steel plate 35 through the bolt connecting plate 36, and the lower ends of the other two diagonal braces 37 are connected to the extended flange of the steel plate of the hoop 34 through the bolt connecting plate 36; the upper ends of the four diagonal braces 37 are connected to the corresponding lower bolt balls 15;

[0053] Specifically, prefabricate the precast bolt ball grid 1 in an onshore factory. Connect multiple upper chord bars 11 into a square grid through multiple upper bolt balls 14, connect multiple lower chord bars 12 into a square grid through multiple lower bolt balls 15, and arrange multiple web members 13 obliquely between the two square grids, with both ends respectively connected to the upper bolt ball 14 and the lower bolt ball 15; at least four web members 13 are connected to each upper bolt ball 14 and each lower bolt ball 15. Connect a pile top connection assembly 3 to each of the four corners of the lower end face of each bolt ball grid 1; connect a partition plate 32 to the lower bolt ball 15, and connect a guiding section 33 to the lower end of the partition plate 32; transport the prefabricated bolt ball grid 1, steel pipe pile 2 and pile top connection assembly 3 to the installation site by a transport barge. When transporting the bolt ball grid 1, steel pipe pile 2 and pile top connection assembly 3, set up a simple tooling on the transport barge and stack the bolt ball grids 1.

[0054] Specifically, install the steel pipe pile 2: The crane ship uses a special pile lifting device to lift the steel pipe pile 2 and hoist it into the fixed position of the pile in the process guiding frame. An adjustable hydraulic jack is provided at the bottom of the guiding frame for fine-tuning the verticality of the pile body; after the steel pipe pile sinks by its own weight to a certain depth, first use a vibratory hammer for pile insertion and pile stabilization of the steel pipe pile, and then use a hydraulic pile hammer for pile sinking. During the pile sinking process, control the relative position and verticality of the pile through the action of the positioning guiding frame, and monitor the verticality of the pile at any time until the pile sinking is completed.

[0055] Specifically, install the precast bolt ball grid 1 on the steel pipe pile 2: Use a crane ship to lift the bolt ball grid 1 as a whole, and insert the guiding section 33 at the lower end of the pile top connection assembly 3 into the upper port of the steel pipe pile 2; weld the partition plate 32 at the upper end of the guiding section 33 to the upper port of the steel pipe pile 2 on site, so that the bolt ball grid 1 and the steel pipe pile 2 are connected into a whole.

[0056] Specifically, install the hoop diagonal brace on the steel pipe pile 2: Use a small construction boat to install the hoop 34 at the predetermined position of the steel pipe pile 2, and connect the bolt ball nodes on the bolt ball grid 1 and the hoop 34 through the diagonal brace 37, and finally form a complete large-span bolt ball grid structure with diagonal braces.

[0057] Please refer to Figure 1-5 , the construction method includes:

[0058] Step S1, prefabricate the bolt ball grid 1, steel pipe piles 2 and pile top connection components 3;

[0059] Step S1, the prefabrication of the bolt ball grid 1, steel pipe piles 2 and pile top connection components 3 includes:

[0060] Step S11, prefabricate the steel pipe piles 2 in an onshore factory;

[0061] Step S12, prefabricate the bolt ball grid 1 in an onshore factory. Connect multiple upper chord rods 11 into a square mesh through multiple upper bolt balls 14, connect multiple lower chord rods 12 into a square mesh through multiple lower bolt balls 15, and arrange multiple web members 13 obliquely between the two square meshes, with both ends respectively connected to the upper bolt ball 14 and the lower bolt ball 15; at least four web members 13 are connected to each upper bolt ball 14 and each lower bolt ball 15.

[0062] Step S13, connect one pile top connection component 3 to each of the four corners of the lower end face of each bolt ball grid 1; connect a ball connection seat 31 and a partition 32 to the lower bolt ball 15, and connect a guiding section 33 to the lower end of the partition 32;

[0063] Step S14, transport the prefabricated bolt ball grid 1, steel pipe piles 2 and pile top connection components 3 to the installation site by a transport barge. When transporting the bolt ball grid 1 and the pile top connection components 3, set up a simple tooling on the transport barge and stack the bolt ball grids 1 for placement.

[0064] Step S2, install the steel pipe piles 2;

[0065] Step S2, the installation of the steel pipe piles 2 includes:

[0066] Step S21, use a crane ship to lift the steel pipe piles 2 with a special pile lifting device and hoist them into the fixed position of the pile in the process guiding frame. An adjustable hydraulic jack is arranged at the bottom of the guiding frame for fine-tuning the verticality of the pile body; after the steel pipe pile sinks by its own weight to a certain depth, first use a vibratory hammer for steel pipe pile insertion and pile stabilization, and then use a hydraulic pile hammer for pile sinking. During the pile sinking process, control the relative position and verticality of the pile through the action of the positioning guiding frame, and monitor the verticality of the pile at any time until the pile sinking is completed.

[0067] Step S3, install the prefabricated bolt ball grid 1 on the steel pipe piles 2;

[0068] Step S3, the installation of the prefabricated bolt ball grid 1 on the steel pipe piles 2 includes:

[0069] Step S31, use a crane ship to lift the bolt ball grid 1 as a whole, and insert the guiding section 33 at the lower end of the pile top connection component 3 into the upper port of the steel pipe pile 2;

[0070] Step S32: Weld the partition plate 32 at the upper end of the guiding section 33 to the upper port of the steel pipe pile 2 on-site, so that the bolt sphere grid 1 and the steel pipe pile 2 are connected into a whole.

[0071] Step S4: Install the hoop diagonal bracing on the steel pipe pile 2.

[0072] Step S4: Installing the hoop diagonal bracing on the steel pipe pile 2 includes:

[0073] Step S41: Use a small construction vessel to install the hoop 34 at the predetermined position of the steel pipe pile 2, and then connect the upper end of the diagonal bracing to the lower bolt sphere through the bolts of the tapered head section at the upper end of the diagonal bracing. The lower ends of two of the diagonal bracings are connected to the connecting steel plate through the bolt connecting plate, and the lower ends of the other two diagonal bracings are connected to the steel plate extended flange of the hoop through the bolt connecting plate; finally, a complete long-span bolt sphere grid structure with diagonal bracings is formed.

[0074] The construction method of the diagonal bracing structure of the offshore photovoltaic bolt sphere grid has the characteristics of high assembly efficiency and convenient construction; it is fixed by welding the pile top connection component to the steel pipe pile, ensuring the overall stability during construction. In addition, by adding diagonal bracing connections, the bearing capacity of the bolt sphere grid and the pile foundation is enhanced, enabling the bolt sphere grid foundation to bear greater loads while reducing the amount of steel structure work. The installation of the diagonal bracing can be carried out after the installation of the pile foundation and the upper bolt sphere grid. It is connected to the hoop through the bolt connecting plate, which reduces the height of the bolt sphere grid during sea transportation, thus enabling multiple bolt sphere grids to be transported simultaneously, effectively reducing the sea transportation cost and enhancing the economy of the project.

[0075] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A construction method for an offshore photovoltaic bolt ball grid brace structure, the offshore photovoltaic bolt ball grid brace structure comprising a bolt ball grid (1), four steel pipe piles (2) and four groups of pile top connection components (3); The upper ends of the four steel pipe piles (2) are respectively connected to a group of pile top connection components (3), and the upper ends of the four groups of pile top connection components (3) are connected to the bolt ball grid (1); The bolt-ball grid comprises (1) a plurality of upper chords (11), a plurality of lower chords (12), a plurality of web members (13), a plurality of upper bolt balls (14) and a plurality of lower bolt balls (15); A plurality of upper chord rods (11) are connected to form a square net through a plurality of upper bolt balls (14); a plurality of lower chord rods (12) are connected to form a square net through a plurality of lower bolt balls (15); a plurality of web rods (13) are obliquely arranged between two square nets, and two ends of the web rods are respectively connected to the upper bolt balls (14) and the lower bolt balls (15); The pile top connection assembly (3) comprises a ball connection seat (31), a partition plate (32) and a guide section (33); The upper end of the ball connection seat (31) is connected to the lower bolt ball (15), the lower end of the ball connection seat (31) is connected to the partition (32), the lower end of the partition (32) is connected to the guide section (33), and the guide section (33) is inserted into the upper port of the steel pipe pile (2); The pile top connection assembly (3) also includes a hoop (34), two connection steel plates (35), four bolt connection plates (36) and four diagonal braces (37); The hoop (34) is connected to the upper end of the outer wall of the steel pipe pile (2), and two connecting steel plates (35) are respectively connected to the two sides of the outer wall of the hoop (34), and the lower ends of the four diagonal braces (37) are respectively connected to a bolt connecting plate (36), wherein the lower ends of two of the diagonal braces (37) are connected to the connecting steel plates (35) through the bolt connecting plates (36), and the lower ends of the other two diagonal braces (37) are connected to the steel plate extension flange of the hoop (34) through the bolt connecting plates (36); the upper ends of the four diagonal braces (37) are connected to the corresponding lower bolt balls (15); It is characterized in that Construction methods include: Step S1, prefabricating a bolt ball grid (1), a steel pipe pile (2) and a pile top connection assembly (3); Step S2, installing the steel pipe pile (2); Step S3, installing the prefabricated bolt ball grid (1) on the steel pipe pile (2); Step S4, installing a clamp oblique support on the steel pipe pile (2).

2. The construction method of the offshore photovoltaic bolt ball grid bracing structure according to claim 1 is characterized in that: The step S1, prefabricating the bolt ball grid (1), the steel pipe pile (2) and the pile top connection assembly (3) comprises: Step S11, prefabricating steel pipe piles (2) in an onshore factory; Step S12, prefabricating a prefabricated bolt ball grid (1) in an onshore factory, connecting a plurality of upper chords (11) into a square grid through a plurality of upper bolt balls (14), connecting a plurality of lower chords (12) into a square grid through a plurality of lower bolt balls (15), and obliquely arranging a plurality of web members (13) between two square grids, with the two ends of the web members respectively connected to the upper bolt balls (14) and the lower bolt balls (15); Step S13, connecting a pile top connection assembly (3) to each of the four corners of the lower end surface of each bolt ball grid (1); connecting a ball connection seat (31) and a partition (32) to the lower bolt ball (15), and connecting a guide section (33) to the lower end of the partition (32); Step S14, transporting the prefabricated bolt ball grid (1), steel pipe piles (2) and pile top connection components (3) to the installation site by means of a transport barge.

3. The construction method of the offshore photovoltaic bolt ball grid bracing structure according to claim 1 is characterized in that: The step S2, installing the steel pipe pile (2) comprises: Step S21, the crane ship uses a special pile lifting device to lift the steel pipe pile (2) and lift it into the fixed position of the pile position of the process guide frame. An adjustable hydraulic jack is set at the bottom of the guide frame to fine-tune the verticality of the pile body. After the steel pipe pile sinks to a certain depth by its own weight, a vibrating hammer is first used to insert and stabilize the steel pipe pile, and then a hydraulic pile hammer is used to sink the pile. During the pile sinking process, the relative position and verticality of the pile are controlled by the positioning guide frame, and the verticality of the pile is monitored at any time until the pile sinking is completed.

4. The construction method of the offshore photovoltaic bolt ball grid bracing structure according to claim 3 is characterized in that: The step S3, installing the prefabricated bolt ball grid (1) on the steel pipe pile (2), comprises: Step S31, using a crane ship to hoist the bolt ball grid (1) as a whole, and inserting the guide section (33) at the lower end of the pile top connection assembly (3) into the upper port of the steel pipe pile (2); Step S32, welding the partition plate (32) at the upper end of the guide section (33) to the upper end of the steel pipe pile (2) on site, so that the bolt ball grid (1) and the steel pipe pile (2) are connected into a whole.

5. The construction method of the offshore photovoltaic bolt ball grid bracing structure according to claim 3 is characterized in that: The step S4, installing the clamp oblique support on the steel pipe pile (2), comprises: Step S41, using a small construction boat to install a clamp (34) at a predetermined position of the steel pipe pile (2), and then connecting the upper end of the diagonal brace (37) to the lower bolt ball (15) through the bolts of the cone head section at the upper end of the diagonal brace, wherein the lower ends of two diagonal braces (37) are connected to the connecting steel plate (35) through a bolt connecting plate (36), and the lower ends of the other two diagonal braces (37) are connected to the steel plate extended flange of the clamp (34) through a bolt connecting plate (36); finally, a complete large-span bolt ball grid structure with diagonal braces is formed.

6. The construction method of the offshore photovoltaic bolt ball grid bracing structure according to claim 2 is characterized in that: At least four webs (13) are connected to each of the upper bolt balls (14) and each of the lower bolt balls (15).

7. The construction method of the offshore photovoltaic bolt ball grid bracing structure according to claim 2 is characterized in that: When the bolt-ball grid frame (1) and the pile top connection assembly (3) are transported, a simple tooling is arranged on a transport barge, and the bolt-ball grid frame (1) is stacked and placed.

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