Offshore photovoltaic platform and manufacturing method

Abstract

The invention relates to an offshore photovoltaic platform and a manufacturing method, and belongs to the technical field of steel structures. The offshore photovoltaic platform comprises a three-dimensional truss structure and a supporting leg structure. The three-dimensional truss structure comprises a first plane truss, a second plane truss, a third module and a straight tie bar; the plurality of second plane trusses are arranged between the adjacent first plane trusses in parallel, and the second upper chord members are vertically connected with the first upper chord members; the adjacent second plane trusses are connected through a plurality of straight lacing wires, a plurality of supporting leg structures are installed below the three-dimensional truss structure, and the supporting leg structures are linearly connected with the three-dimensional truss structure through a plurality of supporting legs. The whole production and manufacturing process of the offshore photovoltaic platform is guided, and the problems that due to the large size of the offshore photovoltaic platform, transportation is difficult, the transportation cost is high, the number of parts is large, and assembling and welding are complex are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel structures, and in particular relates to an offshore photovoltaic platform and a manufacturing method thereof. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] The offshore photovoltaic platform is used to install offshore photovoltaic equipment and is mainly composed of steel pipe piles and steel truss platforms. The steel pipe piles are inserted into the seabed to support the steel truss platform. The steel truss platform is a three-dimensional truss structure, on which are installed special-shaped balls, support legs, purlins, purlin mounting seats, connecting bolt pairs, photovoltaic modules, photovoltaic platform auxiliary structural parts, etc.

[0004] Because the size of the offshore photovoltaic platform is huge (e.g. 58400mm×33600mm×2500mm), it is difficult to transport it to the dock as a whole, and it needs to be manufactured near the dock. Due to its large number of parts, even if it is manufactured as a whole at the dock, it still faces problems such as many parts and complex welding, which brings challenges to the structural design and manufacturing process planning of the offshore photovoltaic platform. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an offshore photovoltaic platform and a manufacturing method, which divides the offshore photovoltaic platform into multiple prefabricated modules and installs them in a set order, thereby improving production and transportation efficiency.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] In a first aspect, an offshore photovoltaic platform includes a three-dimensional truss structure and a support leg structure; the three-dimensional truss structure includes a first plane truss, a second plane truss, a third module and straight tie bars;

[0008] The first plane truss includes a first upper chord and a first lower chord parallel to each other;

[0009] The second plane truss includes a second upper chord and a second lower chord parallel to each other;

[0010] A plurality of the second plane trusses are installed parallel to each other between adjacent first plane trusses, and the second upper chord is vertically connected to the first upper chord to form an upper chord surface; the second lower chord is vertically connected to the first lower chord to form a lower chord surface;

[0011] The third module is connected to the first plane truss and is located on the opposite side of the second plane truss; the third module includes a horizontal rod and an oblique rod; one end of the horizontal rod is connected to the first upper chord rod and is parallel to the upper chord plane; one end of the oblique rod is connected to the first lower chord rod, and the other end is connected to the middle of the horizontal rod, and both the horizontal rod and the oblique rod are parallel to the truss plane of the second plane truss;

[0012] Adjacent second plane trusses are connected by a plurality of straight tie bars, a plurality of second upper chords are fixedly connected to the straight tie bars at a set interval, a plurality of second lower chords are fixed to the straight tie bars at a set interval, and the straight tie bars are parallel to the first upper chords;

[0013] The plurality of support leg structures are installed below the three-dimensional truss structure, and the support leg structure is connected to the three-dimensional truss structure in a straight line through a plurality of support legs.

[0014] Optionally, one end of the supporting leg is connected to the supporting leg structure, and the other end is connected to the connecting node of the plane truss structure, the short leg among the supporting legs is connected to the connecting node of the plane truss structure along the vertical direction; the long leg among the supporting legs is connected to the connecting node of the plane truss structure at a set angle.

[0015] Optionally, the support leg structure includes a support platform, which is arranged below the support leg. The support platform and the support leg are connected by a vertical support column, and horizontal reinforcement rods are connected between adjacent support columns. The support leg structure includes an inclined reinforcement rod, one end of the inclined reinforcement rod is connected to the support platform, and the other end is connected to the support column.

[0016] Optionally, the three-dimensional truss structure includes a plurality of inclined tie bars, both ends of which are respectively connected to the nodes of the three-dimensional truss structure, the inclined tie bars are fixed to the upper chord surface, and are distributed around the periphery of the three-dimensional upper chord surface of the truss, and the angle between the inclined tie bars and the first upper chord rod is 30 to 52 degrees.

[0017] Optionally, a plurality of purlins spaced at a set distance are fixed on the upper chord surface, and the purlins are arranged on the second upper chord rod and parallel to the first upper chord rod and the flat rod.

[0018] Optionally, a spherical structure is provided on the node of the lower chord surface, and the spherical structure is connected to the supporting leg.

[0019] In a second aspect, the method for preparing the above-mentioned offshore photovoltaic platform comprises the steps of:

[0020] S1, prefabricate the first plane truss, the second plane truss and the third module respectively, and sandblast and spray an anti-corrosion layer;

[0021] S2, positioning one end of the plurality of second plane trusses on one side of the first plane truss, positioning another first plane truss on the other end of the plurality of second plane trusses, and then positioning the third module on the outside of the two first plane trusses, laying straight tie bars and spot welding them to obtain a plurality of assembly units;

[0022] S3, after positioning and connecting multiple group units, formally welding the welds;

[0023] S4, installing a purlin fixing seat on the upper chord surface, and installing the purlin through the purlin fixing seat to obtain a three-dimensional truss structure;

[0024] S5. Use the supporting legs to make a plurality of supporting leg structures with different set heights, adjust the three-dimensional truss structure to an inclined posture, and then connect the supporting legs of the supporting leg structure with the lower chord surface.

[0025] Optionally, in S2, while laying the straight reinforcement, the oblique reinforcement is also laid, and the spot welding positioning of the oblique reinforcement is completed.

[0026] Optionally, in S4, the purlin fixing seat is fixed to the second upper chord or the flat bar by bolts, and the purlins connected at the ends are fixedly connected by bolts.

[0027] Optionally, in S4, after the purlins are installed, the anti-corrosion layer is repaired at the welding position of the three-dimensional truss structure.

[0028] Optionally, in S5, the support legs of the support leg structure are welded together with the spherical structure of the lower chord surface.

[0029] The beneficial effects of the present invention are:

[0030] The offshore photovoltaic platform provided by the present invention includes multiple plane truss structures, which are easy to transport. Then, multiple plane trusses are combined with straight rods, inclined rods and purlins to form a three-dimensional truss structure, which guides the entire production process of the offshore photovoltaic platform and solves the problems of transportation difficulties, high transportation costs, many parts, and complex assembly and welding caused by the large size of the offshore photovoltaic platform. In the manufacturing process, the plane truss structure is a prefabricated module, which then undergoes processes such as anti-corrosion, overall module closure, and support leg assembly and welding, and can be quickly manufactured into a finished offshore photovoltaic platform at the dock, which can be quickly shipped and shipped, thereby improving production efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0032] Figure 1 This is a schematic structural diagram of the first plane truss in Example 1.

[0033] Figure 2 This is a schematic structural diagram of the second plane truss in Example 1.

[0034] Figure 3 Schematic diagram of the connection relationship among the first plane truss, the second plane truss and the third module in Example 1.

[0035] Figure 4 Schematic diagram of the connection relationship between the straight tie bars and the oblique tie bars in Example 1.

[0036] Figure 5 Schematic diagram of the support leg structure in Example 1.

[0037] Figure 6 This is a schematic diagram of the distribution of the positioning blocks of Example 1.

[0038] Figure 7 This is a schematic diagram of the placement of each module before spot welding positioning in Example 1.

[0039] Figure 8 This is a schematic structural diagram of the equidistant state of the assembly mold of Example 2.

[0040] Fig. 9 This is a schematic diagram of the assembly method of steps S1 to S5 in Example 4.

[0041] Fig.10 This is a schematic diagram of the assembly method of step S6 in Example 4.

[0042] Among them, 1. first plane truss; 11. first upper chord; 12. first lower chord; 2. second plane truss; 21. second upper chord; 22. second lower chord; 3. third module; 31. flat rod; 32. oblique rod; 4. straight tie bar; 41. oblique tie bar; 5. support leg structure; 51. support leg; 511. first support leg; 512. second support leg; 513. third support leg; 52. support platform; 53. support column; 54. horizontal reinforcement rod; 55. inclined reinforcement rod; 56. special-shaped ball; 6. purlin; 7. spherical structure; 8. positioning block. DETAILED DESCRIPTION

[0043] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] Example 1

[0046] An offshore photovoltaic platform comprises a three-dimensional truss structure and a support leg structure; the three-dimensional truss structure comprises a first plane truss, a second plane truss, a third module and straight tie bars;

[0047] like Figure 1 As shown, the first plane truss 1 includes a first upper chord 11 and a first lower chord 12 which are parallel to each other;

[0048] like Figure 2 As shown, the second plane truss 2 includes a second upper chord 21 and a second lower chord 22 which are parallel to each other;

[0049] like Figure 3 As shown, a plurality of second plane trusses 2 are installed parallel to each other between adjacent first plane trusses 1, and the second upper chord 21 is vertically connected to the first upper chord 11 to form an upper chord surface; the second lower chord 22 is vertically connected to the first lower chord 12 to form a lower chord surface;

[0050] like Figure 3 As shown, the third module 3 is connected to the first plane truss 1 and is located on the opposite side of the second plane truss 2; the third module 3 includes a horizontal rod 31 and an oblique rod 32; one end of the horizontal rod 31 is connected to the first upper chord rod 11 and is parallel to the upper chord plane; one end of the oblique rod 32 is connected to the first lower chord rod 12, and the other end is connected to the middle of the horizontal rod 31, and the horizontal rod 31 and the oblique rod 32 are both parallel to the truss plane of the second plane truss 2;

[0051] like Figure 4 As shown, the adjacent second plane trusses 2 are connected by a plurality of straight tie bars 4, a plurality of second upper chords 21 are fixedly connected to the straight tie bars 4 at a set interval, a plurality of second lower chords 22 are fixed to the straight tie bars 4 at a set interval, and the straight tie bars 4 are parallel to the first upper chord 11;

[0052] like Fig. 9 As shown, a plurality of support leg structures 5 are installed below the three-dimensional truss structure, and the support leg structures 5 are connected to the three-dimensional truss structure via a plurality of support legs 51 .

[0053] In the above settings, if Fig. 9As shown, the first plane truss 1 is the vertical elevation of the three-dimensional truss structure in the length direction; it is the middle part connecting the second plane truss 2 and the third module 3, and the overall dimensions of the module are: 58.4 meters long and 2.5 meters wide, and each platform has 2 first plane trusses 1; to consider the feasibility of transportation, the first plane truss 1 is made in 3 sections, with a single length of about 19 meters and a width of 2.5 meters, and a total of 6 single modules. The second plane truss 2 is the vertical elevation of the middle main part of the three-dimensional truss structure, 22.5 meters long and 2.5 meters wide, with a total of 11 pieces per unit. The third module 3 is the two end parts of the three-dimensional truss structure, about 6 meters long and 2.5 meters wide, with a total of 22 pieces per unit. The three-dimensional truss structure is decomposed into multiple plane trusses and strip-shaped straight tie bars for easy loading and transportation.

[0054] like Figure 5 As shown, one end of the supporting leg 51 is connected to the supporting leg structure 5, and the other end is connected to the connection node of the plane truss structure. The short leg of the supporting leg 51 is connected to the connection node of the plane truss structure along the vertical direction; the long leg of the supporting leg 51 is connected to the connection node of the plane truss structure at a certain angle.

[0055] The supporting leg structure 5 includes a supporting platform 52, which is arranged below the supporting leg 51. The supporting platform 52 and the supporting leg 51 are connected by a vertical supporting column 53. Horizontal reinforcing rods 54 are connected between adjacent supporting columns 53. An inclined reinforcing rod 55 is also arranged between the supporting column 53 and the supporting platform 52. One end of the inclined reinforcing rod 55 is connected to the supporting platform 52, and the other end is connected to the supporting column 53.

[0056] like Figure 4 As shown, the three-dimensional truss structure includes a plurality of oblique tie bars 41, both ends of which are respectively connected to the nodes of the three-dimensional truss structure, and the oblique tie bars 41 are fixed to the upper chord surface and distributed around the periphery of the three-dimensional upper chord surface of the truss, and are inclined relative to the first plane truss 1. The inclination angle is related to the node position of the three-dimensional truss structure. In this embodiment, there are three angles of 32°, 36.5°, and 51.3°.

[0057] like Fig. 9 As shown, a plurality of purlins 6 spaced at a set distance are fixed on the upper chord surface, and the purlins 6 are arranged on the second upper chord rod 21 and the flat rod 31 .

[0058] like Figure 4As shown, a spherical structure 7 is arranged on the node of the lower chord surface, and the supporting leg 51 is connected to the lower chord surface through the spherical structure 7; a spherical structure 7 is arranged on every other vertical support on the lower chord surface of the first plane truss 1, that is, the spherical structure 7 is distributed at the bottom of the 2nd, 4th, 8th and 10th vertical supports of the first plane truss 1 (each first plane truss 1 has 11 vertical supports, and the 6th one is located in the middle position and is subject to a larger supporting force, so the spherical structure 7 can be omitted); a spherical structure 7 is arranged at the bottom of the vertical support of the second plane truss 2 located between two adjacent first plane trusses 1, that is, the bottom of the 2nd and 3rd vertical supports of the second plane trusses located on both sides of the three-dimensional truss structure (each second plane truss 2 has 4 vertical supports, and the 1st and 4th vertical supports are connected to the first plane truss 1).

[0059] The preparation method of the offshore photovoltaic platform of this embodiment is as follows Fig.10 As shown, the steps include:

[0060] S1, prefabricate the first plane truss 1, the second plane truss 2 and the third module 3 respectively, sandblast and spray an anti-corrosion layer; the steps include:

[0061] (1) Cutting process flow: raw material inspection, information verification → cutting and cutting → marking and transplanting → numbering and marking:

[0062] a. The profiles are of fixed length. Before cutting, check the raw material information, such as length, diameter, wall thickness, etc., to ensure that the profile specifications are correct;

[0063] b. Cutting and blanking of raw materials: according to the 3D model, cutting into the required length of a single piece, cutting the intersection line and bevel at the end;

[0064] c. Each cut component should be numbered and marked according to the project numbering rules.

[0065] (2) Polishing:

[0066] a. Grind the welded area at the end of the cut parts to remove the zinc layer. The intersection line at the end and the groove cutting area of ​​15mm to 20mm need to be polished to a metallic luster to avoid affecting the welding quality;

[0067] b. Classify and store the polished parts according to their markings, and store the same parts on the same pallet;

[0068] c. Parts are divided into two types: parts that need to be welded into modules within the factory are transported to the module welding position, and rod-shaped parts that are sent directly to the dock are transported to the anti-corrosion position.

[0069] (3) Module assembly and welding process flow: parts information verification → assembly and welding position tooling verification → module assembly → module welding → module adjustment → non-destructive testing → single module acceptance:

[0070] a. Before welding the modules, check the information of each part of the welded module to ensure correct use;

[0071] b. The module assembly welding position needs to be made according to the single module structure properties, and a special assembly welding position tooling is made to ensure the accuracy of the overall dimensions of the module after assembly welding (among which, the assembly welding position tooling must meet the following requirements: ①, the position reference surface must be flat; ②, the distribution form of the positioning block 8 is as follows: Figure 6 As shown, it is spot welded to the reference surface to ensure that all pipes with different diameters in each module are centrally aligned when docked; ③, the position of the positioning block must avoid interference with the spot welding position);

[0072] c. When assembling modules, the modules should be assembled in the order of welding the main pipes (such as the second upper chord 21 and the second lower chord 22) first and then the webs, and the assembly gap should be controlled;

[0073] d. When welding modules, the connecting welds between the chords should be welded first, and then the web joint welds should be welded to control welding deformation;

[0074] e. When aligning the purlin support seat with the truss upper chord, positioning blocks must be used to ensure the assembly size (the spacing between the photovoltaic panel installation holes is 898mm to 1400mm), and the purlin support seat should be evenly arranged on both sides from the center of the upper chord surface;

[0075] f. After the module is welded, check the overall dimensions and flatness of the module. If warping occurs, mechanical correction is required. Flame correction and violent correction are strictly prohibited to avoid damaging the pipe.

[0076] g. Assemble and weld the 12 supporting legs and reducers at the bottom of the three-dimensional truss structure, and carry out corrosion protection after the butt welds are tested by UT / MT non-destructive testing.

[0077] (4) Sand blasting and anti-corrosion:

[0078] a. Sandblast the qualified modules and parts (the raw materials are all galvanized pipes and fittings, and it is strictly forbidden to use steel sand to blast, which will damage the zinc layer). The surface roughness of the components should meet the requirements of the specifications;

[0079] b. Because rod-shaped parts and modules need to be welded together at the dock, the end welding area (intersection line area 15mm~20mm) is protected with paper tape to avoid paint contamination;

[0080] c. In order to control the loss of paint, place the rod-shaped parts evenly on the bracket, and use a small-caliber spray pot to spray. During the spraying process, rotate the round tube 1-2 times to ensure that the paint film thickness on the surface of the parts is uniform;

[0081] d. The modules are sprayed for corrosion protection, and the anti-corrosion coating of the single modules and parts is strictly implemented in accordance with the project's anti-corrosion process;

[0082] e. After the anti-corrosion is completed, the modules and parts shall be packaged and bundled according to the single module packaging requirements, and marked to avoid bumps, deformation and paint scratches during transportation.

[0083] S2, such as Figure 7 As shown, one end of a plurality of second plane trusses 2 is positioned and placed on a single side of a first plane truss 1, another first plane truss 1 is positioned and placed at the other end of the plurality of second plane trusses 2, and then a third module 3 is positioned and placed outside the two first plane trusses 1, and then spot welded and positioned to obtain a plurality of paired units; the steps include:

[0084] (5) Classification of parts in the terminal area:

[0085] a. The lengths of the first plane truss 1 and the second plane truss 2 are 19m and 22.5m respectively. The first plane truss 1 and the second plane truss 2 need to be directly stored in the folding position, without interfering with the folding tooling and the crawler crane, and convenient for subsequent hoisting during folding;

[0086] b. Rod-shaped parts and module three 3 are classified according to platform type and part type, stored in the parts storage area of ​​the terminal factory, and marked and distinguished with identification plates.

[0087] (6) Closing welding:

[0088] Closing and welding process flow: module and parts information verification → Closing position tooling debugging → module block assembly → module overall closure → steel truss size inspection → non-destructive testing → single unit acceptance:

[0089] a. Before closing, check the information of the single modules to be welded together to confirm the specifications and quantity;

[0090] b. Closing the whole is done by closing the three major units first and then closing the whole. Figure 8 shown);

[0091] c. A special assembly tool is required for closing the tire position. The height of the reference plane is checked using a total station to ensure that the support points of each unit tool (square tube frame) are located on the same plane. Due to the difference in tube diameters, the height of the pads at each positioning position needs to be adjusted before closing to make the tire position tool suitable for the internal platform, external platform, and internal and external box-type transformer platforms. Violent operation is strictly prohibited during assembly to ensure that the overall size of the platform after welding meets the requirements of the drawings;

[0092] d. Figure 8As shown, after the base plane is adjusted, the assembly order is the upper first plane truss 1 → multiple second plane trusses 2 → the lower first plane truss 1 → the upper third module 3 → the lower third module 3. First, use a 50-ton crawler crane to lift the first plane truss 1 to the assembly position, and adjust the accuracy and verticality of its position. Lift multiple second plane trusses 2 to the assembly welding position, and use the same method to adjust the accuracy and verticality of their positions with the reference plane and the connection with module one, and spot weld them to position. Then lift the remaining first plane trusses 1 to the closed position, adjust the position and spot weld them to position, and then lift the third modules 3 on both sides, adjust the position accuracy of the third modules 3 and spot weld them to position;

[0093] e. Repeat the above steps, such as Figure 8 As shown, the truss platform is folded into three units, and then the three units are integrally folded.

[0094] S3, after positioning and connecting the multiple group units, formally welding the welds; including the steps of:

[0095] f. Taking the middle unit as the reference, measure the relative position, pair gap, and diagonal difference between the left and right units, then fix them by spot welding, and then weld the remaining connecting chords including (laying the oblique tie bars 41 at the same time as laying the straight tie bars 4, and completing the spot welding positioning of the oblique tie bars).

[0096] g. After the closure is completed, the closure welds are welded in the closure position. The welding of all welds shall be based on the project welding operation procedures. The weld appearance needs to be polished after welding;

[0097] h. Because the purlin support seats of the second plane truss 2 and the third module 3 have been welded in advance, special tooling must be used when closing to ensure that the spacing between the two groups of purlin support seats on both sides of the closing weld meets the requirements of the drawings;

[0098] i. 24 hours after the welding of the closing weld is completed, the closing weld must be subjected to non-destructive testing in accordance with the project technical specifications, and the testing ratio shall be based on the technical specifications.

[0099] S4, such as Fig. 9 As shown, a purlin support seat is installed on the upper chord surface, and the purlin is installed through a purlin fixing seat. Specifically, the purlin fixing seat is fixed to the second upper chord rod 21 or the flat rod 31 by bolts, and the purlins 6 connected at the ends are fixedly connected by bolts to obtain a three-dimensional truss structure, including the steps of:

[0100] j. Installation of purlin 6, including installation of purlin 6 and supporting seat, butt-jointed installation of adjacent purlins 6 and purlin 6, bolt connection between purlin 6 and purlin seat and between purlins.

[0101] The following requirements must be met when installing purlins:

[0102] 1. When the purlins are butt-jointed in the horizontal direction, the straightness must be ensured;

[0103] 2. When installing in the vertical direction, the spacing between two adjacent purlins 6 must be accurate. A special calibration tool must be made to match the installation size of the photovoltaic panel. The spacing between a single piece is 1400mm, and the vertical spacing between adjacent pieces is 898mm. For details, see the photovoltaic panel arrangement plan diagram;

[0104] 3. All purlins 6 should be located at the same height plane after installation;

[0105] k. When welding the closing weld, a movable windshield device shall be provided in the closing welding operation area to ensure the stability of welding quality;

[0106] 1. When welding at the closing station, since the total height of the three-dimensional truss structure exceeds 3 meters, scaffolding must be set up, and the location of the scaffolding should not affect the overall lifting after welding. Safety protection should be done well, and workers working at heights should wear safety belts.

[0107] (7) Paint repair:

[0108] a. Grind and repair all the butt welds to remove rust and sharp burrs;

[0109] b. Since the zinc layer in the welding area at the intersection line is damaged, the closing weld area is repaired with zinc-rich primer;

[0110] c. According to the project anti-corrosion process, all weld locations shall be painted and repaired for anti-corrosion.

[0111] (8) Photovoltaic module installation:

[0112] The photovoltaic components are installed in the closed position, and the photovoltaic panels are installed between the purlins 6, and the purlins 6 serve as a partition structure for adjacent photovoltaic panels.

[0113] S5, using the support legs 51 to make a plurality of support leg structures 5 with different set heights, adjusting the three-dimensional truss structure to an inclined posture, and then connecting the support legs 51 of the support leg structure 5 to the lower chord surface, including the steps of:

[0114] (9) Support leg structure welding:

[0115] a. At the welding position of the support leg 51, assemble the two groups of high support legs and the two groups of low support legs separately in advance; the connection relationship of the components of the low support leg structure is as follows: Fig. 9 As shown:

[0116] The connection relationship between the components in the support leg structure 5 is as follows: Figure 5As shown, the first support leg 511 and the second support leg 512 are first welded to the special-shaped ball 52, and the third support leg 513 is fixed to the special-shaped ball 56 by spot welding. The spot welding fixation must ensure the support strength of a single pipe (capable of lifting as a whole), and the circumferential seam welding is not performed first;

[0117] b. After the photovoltaic modules are installed, the three-dimensional truss structure is transported to the support leg assembly welding position by using two 260-ton crawler cranes. During the transportation process, a dedicated person is required to direct and maintain the synchronization of the two crawler cranes to ensure the stability of the lifting system. Special lifting equipment is also required.

[0118] c. Place the three-dimensional truss structure after installing the photovoltaic modules on the support leg assembly welding position. Fig. 9 As shown, to ensure that the three-dimensional truss structure has an inclination angle of 15°, multiple support legs 51 are paired with the 12 balls at the bottom of the three-dimensional truss structure respectively; the horizontal and vertical landing points of the steel truss are positioned according to the support tooling to ensure accurate landing positions, that is, 12 support legs are docked with 12 balls. If misalignment or poor docking occurs, the third support leg 513 (unwelded support leg) in each group is cut and separated from the special-shaped ball 56, and the docking position is fine-tuned before spot welding. The support tooling 9 is as shown in FIG. Fig.10 As shown:

[0119] d. After all the butt joints of the support legs 51 are qualified, all the unwelded and butt welds of the 12 support legs 51 are welded. There are 12 butt welds between the upper part of the support leg 51 and the spherical structure 7, and 4 unwelded points at the lower part. The above 16 butt welds are all full penetration welds;

[0120] e. Non-destructive testing and repair of welds;

[0121] f. Repair the butt weld with zinc-rich primer and apply paint to obtain an offshore photovoltaic platform.

[0122] (10) Preparation and delivery:

[0123] a. Use an 800-ton crawler crane and special lifting equipment to hoist the offshore photovoltaic platform as a whole. The lifting point position must be in accordance with the position required in the drawing. According to the shipboard assembly and delivery transportation plan, the finished offshore photovoltaic platform is hoisted onto the ship, and the transportation company is cooperated to fasten and bundle it;

[0124] b. When a crawler crane is lifting, a dedicated person is required to direct and coordinate the operation. During the lifting process, it is strictly forbidden to stand directly under the platform to ensure personal safety.

[0125] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An offshore photovoltaic platform, characterized in that: It includes a three-dimensional truss structure and a supporting leg structure; the three-dimensional truss structure includes a first plane truss, a second plane truss, a third module and straight tie bars; The first plane truss includes a first upper chord and a first lower chord parallel to each other; The second plane truss includes a second upper chord and a second lower chord parallel to each other; A plurality of the second plane trusses are installed parallel to each other between adjacent first plane trusses, and the second upper chord is vertically connected to the first upper chord to form an upper chord surface; the second lower chord is vertically connected to the first lower chord to form a lower chord surface; The third module is connected to the first plane truss and is located on the opposite side of the second plane truss; the third module includes a horizontal rod and an oblique rod; one end of the horizontal rod is connected to the first upper chord rod and is parallel to the upper chord plane; one end of the oblique rod is connected to the first lower chord rod, and the other end is connected to the middle of the horizontal rod, and both the horizontal rod and the oblique rod are parallel to the truss plane of the second plane truss; Adjacent second plane trusses are connected by a plurality of straight tie bars, a plurality of second upper chords are fixedly connected to the straight tie bars at a set interval, a plurality of second lower chords are fixed to the straight tie bars at a set interval, and the straight tie bars are parallel to the first upper chords; The plurality of support leg structures are installed below the three-dimensional truss structure, and the support leg structure is connected to the three-dimensional truss structure in a straight line through a plurality of support legs.

2. The offshore photovoltaic platform according to claim 1, characterized in that: One end of the support leg is connected to the support leg structure, and the other end is connected to the connection node of the plane truss structure. The short leg of the support leg is connected to the connection node of the plane truss structure along the vertical direction; the long leg of the support leg is connected to the connection node of the plane truss structure at a set angle.

3. The offshore photovoltaic platform according to claim 2, characterized in that: The supporting leg structure includes a supporting platform, which is arranged below the supporting leg. The supporting platform and the supporting leg are connected by a vertical supporting column. Horizontal reinforcing rods are connected between adjacent supporting columns. The supporting leg structure includes an inclined reinforcing rod, one end of the inclined reinforcing rod is connected to the supporting platform, and the other end is connected to the supporting column.

4. The offshore photovoltaic platform according to claim 1, characterized in that: The three-dimensional truss structure includes a plurality of oblique tie bars, both ends of which are respectively connected to the nodes of the three-dimensional truss structure, the oblique tie bars are fixed to the upper chord surface, and are distributed around the periphery of the three-dimensional upper chord surface of the truss, and the angle between the oblique tie bars and the first upper chord rod is 30 to 52 degrees.

5. The offshore photovoltaic platform according to claim 1, characterized in that: A plurality of purlins with set intervals are fixed on the upper chord surface, and the purlins are arranged on the second upper chord rod and parallel to the first upper chord rod and the flat rod.

6. The offshore photovoltaic platform according to claim 1, characterized in that: A spherical structure is arranged on the node of the lower chord surface, and the spherical structure is connected to the supporting leg.

7. A method for manufacturing an offshore photovoltaic platform according to any one of claims 1 to 6, characterized in that: Includes steps: S1, prefabricate the first plane truss, the second plane truss and the third module respectively, sandblast and spray an anti-corrosion layer; S2, positioning one end of the plurality of second plane trusses on one side of the first plane truss, positioning another first plane truss on the other end of the plurality of second plane trusses, and then positioning the third module on the outside of the two first plane trusses, laying straight tie bars and spot welding them to obtain a plurality of assembly units; S3, after positioning and connecting multiple group units, formally welding the welds; S4, installing a purlin fixing seat on the upper chord surface, and installing the purlin through the purlin fixing seat to obtain a three-dimensional truss structure; S5. Use the supporting legs to make a plurality of supporting leg structures with different set heights, adjust the three-dimensional truss structure to an inclined posture, and then connect the supporting legs of the supporting leg structure with the lower chord surface.

8. The method for manufacturing an offshore photovoltaic platform according to claim 7, characterized in that: In S2, while laying the straight reinforcement, the oblique reinforcement is also laid, and the spot welding positioning of the oblique reinforcement is completed.

9. The method for manufacturing an offshore photovoltaic platform according to claim 7, characterized in that: In S4, the purlin fixing seat is fixed to the second upper chord or the flat bar by bolts, and the purlins connected at the ends are fixedly connected by bolts; Optionally, in S4, after the purlins are installed, the anti-corrosion layer is repaired at the welding position of the three-dimensional truss structure.

10. The method for manufacturing an offshore photovoltaic platform according to claim 7, characterized in that: In S5, the support legs of the support leg structure are welded together with the spherical structure of the lower chord surface.

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