Offshore photovoltaic double-column row type steel platform structure and mounting method thereof

Abstract

The invention discloses an offshore photovoltaic double-column row type steel platform structure and an installation method thereof, and relates to the technical field of offshore photovoltaic power generation, the row type steel platform structure is formed by continuously installing a plurality of steel platforms at intervals, and each steel platform comprises a double-column foundation, an upper platform steel structure, an adjustable U-shaped bolt structure and a photovoltaic module. The double-column type foundation is composed of two piles which are connected with each other, the upper platform steel structure is installed on the double-column type foundation through the adjustable U-shaped bolt structure, the photovoltaic assembly is installed on the upper platform steel structure, and the double-column type foundation is shared between the steel platforms. According to the double-column row type steel platform structure, the upper platform steel structure and the double-column type foundation are connected through the adjustable U-shaped bolt structure, welding and grouting are not needed, and installation and connection are fast; after a plurality of steel platforms are longitudinally connected into a whole, the integrality is good, the longitudinal rigidity is increased, and the longitudinal deformation is small.

Description

Technical Field

[0001] This invention relates to the field of offshore photovoltaic power generation technology, specifically to a double-column continuous steel platform structure for offshore photovoltaic applications and its installation method. Background Technology

[0002] Offshore photovoltaic (PV) refers to photovoltaic power stations built in the ocean, using photovoltaic technology to convert solar energy into electrical energy. Compared to onshore systems, it is necessary to comprehensively consider self-weight, wind, snow, seismic loads, wave and current loads, and solve the safety issues of the engineering structure under extreme storm surge conditions. The integrated offshore PV support platform structure is a relatively common traditional offshore PV technology. It is generally a four-pile steel platform structure. The lower four pile foundations are constructed first, and then the upper platform is installed on top of the four pile foundations. It has the advantages of relatively simple structure and convenient upper structure construction, but the following problems still exist:

[0003] (1) The amount of pile foundation work is large. In traditional technology, four pile foundations correspond to one steel platform, and the pile foundations cannot be shared, so the amount of pile foundation work is large.

[0004] (2) Cantilever piles have low stiffness. In traditional technology, four piles are constructed separately, and the amount of work involved in connecting the piles is relatively large. Generally, no connection measures are taken, and they are all cantilever piles, which have low horizontal stiffness.

[0005] (3) Low construction efficiency of pile foundation. In traditional technology, four pile foundations are constructed separately. The upper platform and the lower pile foundation are often connected by ball joints or end plates, which requires high accuracy of pile driving and affects the efficiency of pile driving. At the same time, the upper platform and the lower pile foundation are often connected by welding, and the efficiency of multiple welding is low.

[0006] Pedestrian access and cable connections between platforms are difficult. In traditional technology, the steel platforms are independent of each other and the distance between them is large. Therefore, during maintenance, pedestrian access between platforms requires getting off the steel platform and taking a boat to reach the next platform. Cable routing between steel platforms requires additional structural measures. Summary of the Invention

[0007] This invention provides a double-column continuous steel platform structure for offshore photovoltaic applications and its installation method, in order to solve the problems mentioned in the background art.

[0008] The present invention is achieved through the following technical solution.

[0009] This invention provides a double-column continuous steel platform structure for offshore photovoltaics. The continuous steel platform structure is formed by the continuous and spaced installation of multiple steel platforms. Each steel platform includes a double-column foundation, an upper platform steel structure, an adjustable U-bolt structure, and photovoltaic modules. The double-column foundation consists of two interconnected piles. The upper platform steel structure is installed on the double-column foundation via the adjustable U-bolt structure. The photovoltaic modules are installed on the upper platform steel structure. The steel platforms share the double-column foundation.

[0010] In this technical solution, a double-column connected row structure is adopted, that is, a double-column foundation is set at both ends of each steel platform, and each double-column foundation is shared by the steel platforms on both sides. Through the double-column foundation, multiple steel platforms are longitudinally connected into a whole.

[0011] Furthermore, the two piles are connected by multiple diagonal and horizontal braces.

[0012] Furthermore, the double-column foundation is prefabricated as a whole in the factory.

[0013] In this technical solution, a double-column foundation is adopted, that is, a double-column foundation is set at each end of the long side of each steel platform. The double-column foundation consists of two piles and diagonal and horizontal bracing between the piles. The double-column foundation is prefabricated as a whole in the factory and is sunk into the mud surface as a whole.

[0014] Furthermore, the upper platform steel structure is composed of a lower chord, diagonal web members, an upper chord, and purlins. The diagonal web members are welded between the lower chord and the upper chord. The purlins are divided into main purlins and secondary purlins that are vertically connected. The main purlins are installed on the upper part of the upper chord, and the secondary purlins are installed on the main purlins. The photovoltaic modules are installed on the upper part of the secondary purlins.

[0015] Furthermore, the upper platform steel structure is prefabricated as a whole in the factory.

[0016] Furthermore, the adjustable U-bolt structure includes a horizontal connecting rod, a horizontal connecting beam structure, a horizontal web member, an oblique web member, and a U-bolt structure. The horizontal web member is welded between the horizontal connecting rod and the lower chord, and the oblique web member is welded between the horizontal connecting rod and the upper chord. The horizontal connecting rod is installed on the horizontal connecting beam structure through the U-bolt structure.

[0017] Furthermore, the horizontal connecting beam structure consists of a horizontal connecting beam, a foundation connecting beam, and a longitudinal connecting beam. The foundation connecting beam is located on the side of the pile, the longitudinal connecting beam is welded to both sides of the foundation connecting beam, and the horizontal connecting beam is welded to the upper part of the foundation connecting beam and the longitudinal connecting beam.

[0018] Furthermore, the U-bolt structure consists of a U-bolt, two trapezoidal steel plates, and nuts. The two trapezoidal steel plates are welded to the upper part of the horizontal connecting beam with their short sides facing each other, leaving a gap in the middle slightly larger than the diameter of the horizontal connecting rod to form a guide structure. The horizontal connecting rod is installed on the upper part of the horizontal connecting beam through this guide structure, and the horizontal connecting rod is fixed to the horizontal connecting beam by multiple U-bolts and nuts.

[0019] In this technical solution, the upper platform steel structure and the piles are connected by an adjustable U-bolt structure, that is, two horizontal connecting rods can be extended outward from both ends of the lower chord, and a horizontal connecting beam is set on the pile in a direction perpendicular to the horizontal connecting rods. The two are connected by U-bolts and nuts.

[0020] The present invention also provides an installation method for the above-mentioned double-column continuous steel platform structure for offshore photovoltaic applications, comprising the following steps:

[0021] S1: Precast double-column foundation, in which foundation connecting beams are installed on the sides of piles, then longitudinal connecting beams are welded to both sides of foundation connecting beams, and then horizontal connecting beams are installed on the top of foundation connecting beams and longitudinal connecting beams.

[0022] S2: Prefabricate the upper platform steel structure to weld the horizontal connecting rods to both sides of the lower chord, and then install the horizontal web members and diagonal web members in sequence;

[0023] S3: Transport the installed double-column foundation and upper platform steel structure to the designated location in the photovoltaic field;

[0024] S4: According to the design requirements, use pile driving equipment to sink multiple sets of double-column foundations into the designated position and design elevation as a whole;

[0025] S5: The upper platform steel structures with horizontal connecting rods are hoisted sequentially onto the horizontal connecting beam structure between the double column foundations and fixed with U-bolts to complete the overall installation.

[0026] The beneficial effects of this invention are:

[0027] (1) Adopting a double-column foundation: ① A double-column foundation consists of two piles and diagonal and horizontal bracing between the piles, forming a planar truss structure. This greatly improves the stress conditions compared to the traditional cantilever pile structure, and the horizontal stiffness is greatly enhanced. Under the same platform stress, the pile diameter can be reduced, thus reducing the amount of steel used in the foundation. ② A double-column foundation consists of two piles and diagonal and horizontal bracing between the piles, forming a sheet structure that can be stacked for transportation, making transportation convenient. ③ A double-column foundation is fabricated as a whole and sunk into the mud surface as a whole. Therefore, its relative position is fixed, and it does not require precise positioning at sea. It is not strict about the accuracy of pile driving, and the pile driving is convenient and fast.

[0028] (2) The upper platform steel structure is connected to the double column foundation using an adjustable U-bolt structure: ① When installing the upper platform steel structure, it is first temporarily placed on the horizontal connecting beam of the double column foundation. Then, the upper platform steel structure is connected to the double column foundation through the U-bolt structure. No welding or grouting is required, making installation and connection quick; ② The horizontal connecting rod on the upper platform steel structure is perpendicular to the horizontal connecting beam on the double column foundation. The two are connected by U-bolts and nuts. The horizontal connecting rod is a round tube of equal diameter. Its position relative to the horizontal connecting beam can be adjusted longitudinally. After adjustment, it does not affect the U-bolt connection. Therefore, this connection structure is not strict about the allowable error of the double column foundation installation and the pile driving accuracy, so the pile driving is quick.

[0029] (3) Adopting a double-column connected structure: ① After multiple steel platforms are connected longitudinally into a whole, the integrity is good, the longitudinal stiffness is increased, and the longitudinal deformation is small; ② After multiple steel platforms are connected longitudinally into a whole, each steel platform has no relative displacement in the longitudinal direction, and each adjacent steel platform is connected through a double-column foundation. Pedestrian traffic and cable channels are connected in the longitudinal direction, which facilitates operation and maintenance and cable laying, and solves the problem of cable connection between steel platforms. Attached Figure Description

[0030] Figure 1 This is a side elevation view of the double-column continuous steel platform structure for offshore photovoltaic applications according to the present invention;

[0031] Figure 2 This is a front elevation view of the double-column continuous steel platform structure for offshore photovoltaic applications according to the present invention;

[0032] Figure 3 This is a front elevation view of a single steel platform of the present invention;

[0033] Figure 4 for Figure 3 A magnified view of part A in the image;

[0034] Figure 5 This is a plan view of the steel structure of the upper platform of the present invention;

[0035] Figure 6 Plan view of the upper chord of the steel structure of the upper platform of this invention;

[0036] Figure 7 This is a plan view of the inclined web members of the upper platform steel structure of the present invention;

[0037] Figure 8 This is a plan view of the lower chord of the upper platform steel structure of the present invention;

[0038] Figure 9 This is a plan view showing the connection between the upper platform steel structure and the double-column foundation of this invention;

[0039] Figure 10 for Figure 9 A magnified view of part B in the image;

[0040] Figure 11 This is an elevation view of the connection between the upper platform steel structure and the double-column foundation of this invention;

[0041] Figure 12 This is a plan view of the U-bolt connection of the present invention;

[0042] Figure 13 This is an elevation view of the U-bolt connection of the present invention;

[0043] Figure 14 This is a cross-sectional view of the U-bolt connection of the present invention.

[0044] In the picture:

[0045] 1-Double column foundation, 11-Pile, 12-Diagonal brace, 13-Horizontal brace;

[0046] 2-Upper platform steel structure, 21-Lower chord, 22-Diagonal web member, 23-Upper chord, 24-Purifier, 241-Main purlin, 242-Secondary purlin;

[0047] 3-Adjustable U-bolt structure, 31-Horizontal connecting rod, 32-Horizontal connecting beam structure, 321-Horizontal connecting beam, 322-Foundation connecting beam, 323-Longitudinal connecting beam, 33-Horizontal web member, 34-Diagonal web member, 35-U-bolt structure, 351-U-bolt, 352-Trapezoidal steel plate, 353-Nut;

[0048] 4- Photovoltaic modules;

[0049] 5-Steel platform. Detailed Implementation

[0050] The following description further illustrates the structures involved in this invention and the technical terms used therein. These descriptions are merely illustrative of how the invention is implemented and do not constitute any limitation on the invention.

[0051] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "lateral," and "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of this invention, unless otherwise explicitly specified and limited, terms such as "connection" and "fixation" should be interpreted broadly. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral part; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] like Figure 1-14 As shown, a double-column continuous steel platform structure for offshore photovoltaics is provided. The continuous steel platform structure is formed by the continuous and spaced installation of multiple steel platforms 5. Each steel platform 5 includes a double-column foundation 1, an upper platform steel structure 2 installed between the double-column foundations 1, an adjustable U-bolt structure 3 for connecting the double-column foundations 1 and the upper platform steel structure 2, and photovoltaic modules 4 installed on the upper platform steel structure 2. The steel platforms 5 share the double-column foundation 1, and the continuous and spaced installation of the steel platforms 5 forms a continuous steel platform structure.

[0054] like Figure 2-3 As shown, a double-column connected row structure is adopted, that is, each steel platform 5 is provided with a double-column foundation 1 at both ends, and each double-column foundation 1 is shared by the steel platforms 5 on both sides. Through the double-column foundation 1, multiple steel platforms 5 are longitudinally connected into a whole.

[0055] like Figure 1-2 As shown, the double-column foundation 1 consists of two piles 11, multiple diagonal braces 12 between the piles 11, and horizontal braces 13. The diagonal braces 12 can be in the form of a single round tube, square tube, or polygonal tube, or they can be in the form of an "X-shaped" diagonal brace formed by two tubes. The lower part of the double-column foundation 1 is submerged below the mud surface, and the upper part is above the mud surface. The two piles 1 can be at the same height or there can be a certain height difference, so that the upper platform steel structure 2 and photovoltaic module 4 have a certain tilt angle after installation, which improves the power generation efficiency of the photovoltaic module.

[0056] like Figure 1-7 As shown, the upper platform steel structure 2 consists of a lower chord 21, diagonal web members 22, an upper chord 23, and purlins 24. The entire upper platform steel structure 2 is prefabricated in the factory. The diagonal web members 22 are welded between the lower chord 21 and the upper chord 23 to form a spatial grid structure. The purlins 24 are divided into main purlins 241 and secondary purlins 242. The main purlins 241 are installed on the upper part of the upper chord 23, and the secondary purlins 242 are installed on the upper part of the main purlins 231 and perpendicular to the main purlins 241. The photovoltaic modules 4 are installed on the upper part of the secondary purlins 242.

[0057] like Figure 8-14As shown, the adjustable U-bolt structure 3 consists of a horizontal connecting rod 31, a horizontal connecting beam structure 32, a horizontal web member 33, an oblique web member 34, and a U-bolt structure 35. The horizontal connecting beam structure 32 consists of a horizontal connecting beam 321, a foundation connecting beam 322, and a longitudinal connecting beam 323. The U-bolt structure 35 consists of a U-bolt 351, two trapezoidal steel plates 352, and a nut 353. The horizontal connecting rod 31 is installed on the horizontal connecting beam structure 32, and the U-bolt structure 35 fixes the horizontal connecting rod 31 to the horizontal connecting beam structure 32.

[0058] Specifically, such as Figure 11-13 As shown, the horizontal connecting rod 31 is welded to both sides of the lower chord 21 of the upper platform steel structure 2, the horizontal web member 33 is welded between the horizontal connecting rod 31 and the lower chord 21, and the diagonal web member 34 is welded between the horizontal connecting rod 31 and the upper chord 23; the foundation connecting beam 322 is set on the side of the pile 11, the longitudinal connecting beam 323 is welded to both sides of the foundation connecting beam 322, and the horizontal connecting beam 321 is welded to the upper part of the foundation connecting beam 322 and the longitudinal connecting beam 323.

[0059] like Figure 14 As shown, two trapezoidal steel plates 352 are welded to the upper part of the horizontal connecting beam 321 with their short sides facing each other. A gap slightly larger than the diameter of the horizontal connecting rod 321 is left in the middle to form a guide structure. The horizontal connecting rod 31 is installed on the upper part of the horizontal connecting beam 321 through this guide structure, which also restricts the lateral movement of the horizontal connecting rod 31. The horizontal connecting rod 31 is perpendicular to the horizontal connecting beam 321 and is a circular tube of equal diameter, which can move longitudinally between the trapezoidal steel plates 352, thereby realizing the longitudinal adjustment of the upper platform steel structure 2 and guiding the installation of the horizontal connecting rod 31.

[0060] like Figure 14 As shown, after adjustment, a multi-U-bolt structure 35 is used for fixation. Specifically, U-bolts 351 are used to fix the horizontal connecting rod 31 to the horizontal connecting beam 321, and nuts 353 are used for further fixation.

[0061] Please see Figure 1-14 The specific steps for installing the aforementioned double-column continuous steel platform structure for offshore photovoltaic applications are as follows:

[0062] S1: Prefabricate the double-column foundation 1 in the factory, so that the foundation connecting beam 322 is set on the side of the pile 11, and then the longitudinal connecting beam 323 is welded to both sides of the foundation connecting beam 322. Then, the horizontal connecting beam 321 is installed on the upper part of the foundation connecting beam 322 and the longitudinal connecting beam 323.

[0063] S2: The upper platform steel structure 2 is prefabricated in the factory, and the horizontal connecting rod 31 is welded to both sides of the lower chord 21 of the upper platform steel structure 2. Then, the horizontal web members 33 and the diagonal web members 34 are welded in sequence.

[0064] S3: Transport the installed double-column foundation 1 and upper platform steel structure 2 to the designated location in the photovoltaic field.

[0065] S4: According to the design requirements, use pile driving equipment to sink multiple sets of double column foundations 1 into the designated position and design elevation as a whole.

[0066] S5: The upper platform steel structures 2 with multiple horizontal connecting rods 31 are hoisted sequentially between the double column foundations 1 and installed on the horizontal connecting beam structure 32 with the help of trapezoidal steel plates 352. The hoisting of the upper platform steel structures 2 can be adjusted longitudinally according to the on-site pile foundation conditions. Finally, they are fixed with U-bolt structures 35 to complete the overall installation.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended 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 described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-column continuous steel platform structure for offshore photovoltaic applications, characterized in that: The continuous steel platform structure is formed by the continuous and spaced installation of multiple steel platforms. Each steel platform includes a double-column foundation, an upper platform steel structure, an adjustable U-bolt structure, and photovoltaic modules. The double-column foundation consists of two interconnected piles. The upper platform steel structure is installed on the double-column foundation through the adjustable U-bolt structure. The photovoltaic modules are installed on the upper platform steel structure. The steel platforms share the double-column foundation.

2. The double-column continuous steel platform structure for offshore photovoltaic power generation according to claim 1, characterized in that: The two piles are connected by multiple diagonal and horizontal braces.

3. The double-column continuous steel platform structure for offshore photovoltaic power according to claim 1, characterized in that: The double-column foundation is prefabricated as a whole in the factory.

4. The double-column continuous steel platform structure for offshore photovoltaic power generation according to claim 1, characterized in that: The upper platform steel structure consists of a lower chord, diagonal web members, an upper chord, and purlins. The diagonal web members are welded between the lower chord and the upper chord. The purlins are divided into main purlins and secondary purlins that are vertically connected. The main purlins are installed on the upper part of the upper chord, and the secondary purlins are installed on the main purlins. The photovoltaic modules are installed on the upper part of the secondary purlins.

5. The double-column continuous steel platform structure for offshore photovoltaic power according to claim 1, characterized in that: The upper platform steel structure is prefabricated as a whole in the factory.

6. The double-column continuous steel platform structure for offshore photovoltaic power according to claim 1, characterized in that: The adjustable U-bolt structure includes a horizontal connecting rod, a horizontal connecting beam structure, a horizontal web member, an oblique web member, and a U-bolt structure. The horizontal web member is welded between the horizontal connecting rod and the lower chord, and the oblique web member is welded between the horizontal connecting rod and the upper chord. The horizontal connecting rod is installed on the horizontal connecting beam structure through the U-bolt structure.

7. The double-column continuous steel platform structure for offshore photovoltaic power according to claim 6, characterized in that: The horizontal connecting beam structure consists of a horizontal connecting beam, a foundation connecting beam, and a longitudinal connecting beam. The foundation connecting beam is located on the side of the pile, the longitudinal connecting beam is welded to both sides of the foundation connecting beam, and the horizontal connecting beam is welded to the upper part of the foundation connecting beam and the longitudinal connecting beam.

8. The double-column continuous steel platform structure for offshore photovoltaic power according to claim 7, characterized in that: The U-bolt structure consists of a U-bolt, two trapezoidal steel plates, and nuts. The two trapezoidal steel plates are welded to the upper part of the horizontal connecting beam with their short sides facing each other, leaving a gap in the middle larger than the diameter of the horizontal connecting rod to form a guide structure. The horizontal connecting rod is installed on the upper part of the horizontal connecting beam through this guide structure, and the horizontal connecting rod is fixed to the horizontal connecting beam by multiple U-bolts and nuts.

9. An installation method for a double-column continuous steel platform structure for offshore photovoltaic applications according to any one of claims 1-8, characterized in that: Includes the following steps: S1: Precast double-column foundation, in which foundation connecting beams are installed on the sides of piles, then longitudinal connecting beams are welded to both sides of foundation connecting beams, and then horizontal connecting beams are installed on the top of foundation connecting beams and longitudinal connecting beams. S2: Prefabricate the upper platform steel structure to weld the horizontal connecting rods to both sides of the lower chord, and then install the horizontal web members and diagonal web members in sequence; S3: Transport the installed double-column foundation and upper platform steel structure to the designated location in the photovoltaic field; S4: According to the design requirements, use pile driving equipment to sink multiple sets of double-column foundations into the designated position and design elevation as a whole; S5: The upper platform steel structures with horizontal connecting rods are hoisted sequentially onto the horizontal connecting beam structure between the double column foundations and fixed with U-bolts to complete the overall installation.

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