Purline-free photovoltaic support structure

Through the design of the purlin-free photovoltaic support structure, the combination of point-type support components and support platforms is used to solve the problems of low efficiency and high cost of construction on water of the existing photovoltaic support structure, and the effect of rapid assembly and cost reduction is achieved.

CN222169661UActive Publication Date: 2024-12-13天津港航工程有限公司 +1
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Patent Information

Application Number
CN202323624298.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-29
Publication Date
2024-12-13
Estimated Expiration
2033-12-29

AI Technical Summary

Technical Problem

During the construction of existing photovoltaic support structures on water, due to the complex assembly of purlins, the operating efficiency and high cost are low, making it impossible to achieve rapid construction.

Method used

A purlin-free photovoltaic support structure is designed, consisting of photovoltaic modules, point-type support components and support platforms. It adopts a single fulcrum, double fulcrum and four fulcrum support structure, and quickly assemble and fix it through the support platform connector and photovoltaic module connector. , simplifies the construction process.

Benefits of technology

It realizes rapid and reliable assembly of photovoltaic modules, reduces construction costs, and shortens construction periods through factory prefabrication and on-site assembly.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a purline-free photovoltaic supporting structure which is composed of a photovoltaic assembly, a point type supporting assembly and a supporting platform which are sequentially arranged from top to bottom. The photovoltaic assembly is of a rectangular integral structure composed of a plurality of photovoltaic panel frames and a plurality of photovoltaic panels assembled in the photovoltaic panel frames respectively. The point-type supporting assembly is composed of a plurality of single-fulcrum supports arranged at the top corners of a photovoltaic panel frame located at the top corners of the photovoltaic assembly, a plurality of double-fulcrum supports arranged at the top corners of the photovoltaic panel frame located at the top corners of the photovoltaic assembly, and at least one single-fulcrum support arranged in the middle of the photovoltaic assembly, the four-fulcrum supports are located below the four adjacent photovoltaic panel frames; the photovoltaic assemblies are detachably fixed to the connecting nodes on the top face of the supporting platform through the point type supporting assemblies. The purline-free photovoltaic supporting structure can be quickly and conveniently assembled and combined, the construction cost is low, all the components can be directly transported to the sea surface to be assembled on site after being prefabricated, and the construction period is greatly shortened.
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Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic technology on water surfaces, lakes, offshore and offshore waters, and in particular to a purlin-free photovoltaic support structure. Background Art

[0002] Photovoltaic power generation requires a large number of scattered components to be assembled, and water operations cannot be carried out on a large scale. Each work surface requires the cooperation of ships. Existing photovoltaic support structures mostly use support frames formed by purlins. The structure of the support frame is relatively complex, and the construction site requires construction workers to assemble a whole batch of transported single purlins to form a frame that is suitable for the size of the photovoltaic panel assembly, and then install the photovoltaic panel assembly. In addition, since the purlin assembly construction is carried out on the water, the assembly process requires the assistance of corresponding operating ships. Not only is the operation efficiency low, but the use of operating ships increases construction costs. Therefore, in order to reduce the number of operating ships and improve construction efficiency, a purlinless photovoltaic support system is designed, which can be quickly assembled on site, saving ships and reducing construction costs. Utility Model Content

[0003] The purpose of the utility model is to provide a purlin-free photovoltaic support structure that solves the above technical problems.

[0004] To this end, the technical solution of the utility model is as follows:

[0005] A purlinless photovoltaic support structure, which is composed of a photovoltaic assembly, a point support assembly and a support platform arranged in sequence from top to bottom; wherein the photovoltaic assembly is a rectangular integral structure composed of a plurality of photovoltaic panel frames and a plurality of photovoltaic panels respectively assembled in the frames of each photovoltaic panel; the point support assembly is composed of a plurality of single-point supports, a plurality of double-point supports and at least one four-point support; the single-point support is arranged at the top corner of the photovoltaic panel frame located at the top corner of the photovoltaic assembly, and is composed of a support platform connector and a first photovoltaic assembly connector; the support platform connector includes a first fixing rod and a limiting cap at its top end; The first photovoltaic module connector includes a single sleeve rod and a second fixed rod. The second fixed rod is vertically arranged, and an upper fixed plate and a lower fixed plate are sleeved and fixed on its top side from top to bottom at intervals, and a fixing nut is threadedly connected on its bottom side; the single sleeve rod is a rod body with sleeves at both ends, so that its two ends are respectively sleeved on the first fixed rod and the second fixed rod through the sleeves; the double-point support is arranged at the top corners of the two adjacent photovoltaic panel frames on the edge of the photovoltaic module, and is composed of a support platform connector and a second photovoltaic module connector; the support platform connector includes the first fixed rod and the limiting cap at the top end thereof; the second photovoltaic module connector includes a double The sleeve rod and two second fixing rods, each second fixing rod top side is sleeved and fixed with an upper fixing plate and a lower fixing plate at intervals from top to bottom, and the bottom side thereof is threadedly connected with a fixing nut; the double sleeve rod is a V-shaped rod body, and the two end portions of the open side thereof are provided with sleeves respectively sleeved on the two second fixing rods, and the closed side end portion thereof is provided with a sleeve sleeved on the first fixing rod; the four-point support is arranged in the middle of the photovoltaic module and is located at the top corners of the frames of the four adjacent photovoltaic panels, and is composed of a support platform connector and a third photovoltaic module connector; the support platform connector includes a first fixing rod and a limiting cap at the top end thereof; the third photovoltaic module connector The connector includes four sets of rods and four second fixing rods, each second fixing rod has an upper fixing plate and a lower fixing plate spaced and fixed thereon from top to bottom, and a fixing nut is threadedly connected to the bottom side; the four sets of rods are cross-shaped rod bodies, and the four ends thereof are provided with sleeves respectively sleeved on the four second fixing rods, and the center thereof is provided with a sleeve sleeved on the first fixing rod; the first fixing rod of each supporting platform connecting member is connected to the supporting platform, and the second fixing rod of each photovoltaic module connecting member is connected to the bottom surface of the photovoltaic panel frame, so that the photovoltaic module can be detachably fixed at each connection node on the top surface of the supporting platform through the point-type support assembly. Furthermore, the photovoltaic panel frame is a rectangular frame that can be equipped with one or more photovoltaic panels.

[0006] Furthermore, an inner annular boss is formed extending from the lower side of the inner frame edge of each photovoltaic panel frame toward the center of the frame, so that the photovoltaic panel is embedded in the photovoltaic panel frame by being pressed onto the inner annular boss.

[0007] Furthermore, corner plates are provided at the four top corners of the top surface of each photovoltaic panel frame, and the corner plates are fixed to the photovoltaic panel frame, or to the photovoltaic panel and the photovoltaic panel frame through corner plate connectors.

[0008] Furthermore, the shape of the armpit angle plate can be but not limited to a triangle, a square, or an angle steel, and the armpit angle plate connecting piece is a screw or a buckle with a two-way spacing adjustment function to reduce the error requirements on the installation accuracy.

[0009] Furthermore, in the supporting platform connector, the first fixing rod is vertically arranged, and its bottom end is welded or threadedly fixed to the connecting node of the supporting platform; the limiting cap is welded or threadedly fixed to the top of the first fixing rod. The connecting node on the supporting platform is specifically a node preset on the supporting platform for connecting and fixing with the photovoltaic module. The pre-setting of the connecting node can ensure that the size of the photovoltaic module matches that of the supporting platform, so as to facilitate the subsequent on-site assembly construction.

[0010] Furthermore, in each photovoltaic module connector, the second fixing rod is welded or threadedly fixed to the bottom surface of the photovoltaic panel frame; a sleeve at one end of the sleeve rod is sleeved on the second fixing rod, and the lower fixing plate and the fixing nut are respectively tightly pressed against both ends of the sleeve.

[0011] Furthermore, a buffer pad is provided on the top surface of the upper connecting plate of each photovoltaic module connector, so that the supporting platform connector contacts the bottom surface of the photovoltaic panel frame through the buffer pad to reduce the adverse effects of construction vibration on the photovoltaic module.

[0012] Furthermore, the supporting platform is composed of an upper platform layer, a connecting beam body and a lower platform layer which are connected in sequence from top to bottom; the upper platform layer and the lower platform layer are both planar structures formed by multiple connecting beams, and the connecting beam body is a vertical structure with a flat or inclined top surface formed by multiple connecting beams, and the specific inclination angle is designed according to the optimal lighting angle of the photovoltaic panel.

[0013] Furthermore, the upper platform layer is a planar structure formed by connecting multiple connecting beams, and the connecting points between the connecting beams are connecting nodes that are adapted to the top angle positions of the frames of the photovoltaic panels; and a reinforcing structure is provided at the connecting points between the connecting beams.

[0014] Compared with the existing technology, the purlinless photovoltaic support structure consists of photovoltaic modules, point support modules and support platforms. The point support modules specifically include three structural forms: single-point support, double-point support and four-point support. The photovoltaic modules and the support platform are connected as a whole, avoiding the use of traditional photovoltaic support systems and the connection is reliable. The assembly of multiple photovoltaic panels can be completed quickly and conveniently, which not only reduces construction costs, but also all component structures can be prefabricated in the factory and directly transported to the sea for on-site assembly, realizing full assembly connection and greatly shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a structural schematic diagram of a purlin-free photovoltaic support structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the split structure of the photovoltaic module and the supporting platform of the purlinless photovoltaic supporting structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the split structure of the photovoltaic assembly and the point-type support assembly of the purlin-free photovoltaic support structure of the utility model;

[0018] Figure 4 It is a structural schematic diagram of a single-point support of a point-type support assembly of a purlinless photovoltaic support structure of the utility model;

[0019] Figure 5 It is a structural schematic diagram of double-support point support of the point-type support assembly of the purlinless photovoltaic support structure of the utility model;

[0020] Figure 6 It is a structural schematic diagram of the four-point support of the point-type support assembly of the purlinless photovoltaic support structure of the utility model. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention in any way.

[0022] See also Figure 1 The purlinless photovoltaic support structure is composed of a photovoltaic component 1, a point support component 2 and a support platform 3 arranged in sequence from top to bottom; the photovoltaic component 1 is detachably fixed to each connection node preset in advance on the top surface of the support platform 3 through the point support component 2.

[0023] See also Figure 2 The photovoltaic module 1 is a rectangular integral structure consisting of four photovoltaic panel frames 5 and eight dry photovoltaic panels 4 respectively installed in the four photovoltaic panel frames 5; specifically, the photovoltaic panel frame 5 is a square frame that can be equipped with two photovoltaic panels 4, and extends from the lower side of the inner frame edge of each photovoltaic panel frame 5 toward the center of the frame and forms an inner annular boss, so that the photovoltaic panel 4 is embedded in the photovoltaic panel frame 5 by being pressed on the inner annular boss; four square photovoltaic panel frames 5 equipped with photovoltaic panels are spliced ​​to form a photovoltaic module with a large-size square planar structure.

[0024] In order to fasten the photovoltaic panel 4 in the photovoltaic panel frame 5, an axillary angle plate 5a with a right-angled triangle structure is arranged at the four top corners of the top surface of each photovoltaic panel frame 5; wherein, the axillary angle plate 5a is arranged at the top corner of the photovoltaic panel frame 5 in a manner that its two right-angled sides are opposite to the two right-angled sides at the top corner of the photovoltaic panel frame 5, and through holes are opened on the axillary angle plate 5a and the photovoltaic panel frame 5, so that the two are fixed to each other through the axillary angle plate connector passed through the through hole, so that the photovoltaic panel 4 is firmly clamped between the axillary angle plate 5a and the photovoltaic panel frame 5; in the present embodiment, the axillary angle plate connector is a stud bolt passed through the axillary angle plate 5a and the photovoltaic panel frame 5, and the adjusting nuts at both ends of the stud bolt are respectively against the axillary angle plate 5a and the photovoltaic panel frame 5.

[0025] See also Figure 3 to Figure 6 The point support assembly 2 is composed of four single-point supports 7, four double-point supports 6 and one four-point support 8. The three point support assemblies effectively prevent the photovoltaic assembly 1 from horizontal displacement by limiting and fixing the top corners of the photovoltaic panel frame 5.

[0026] See also Figure 4 The single-point support 7 is arranged at the top corner of the photovoltaic panel frame 5 located at the top corner position of the photovoltaic module 1, and is composed of a first photovoltaic module connector and a support platform connector; specifically, the support platform connector includes a first fixing rod 7g and a limiting cap 7h arranged at its top end; the first fixing rod 7g is arranged vertically, and its bottom end is welded and fixed to the connection node of the support platform 3, and the limiting cap 7h is threadedly connected and fixed to the top of the first fixing rod 7g; the first photovoltaic module connector includes a single sleeve rod 7a and a second fixing rod 7b, and the second fixing rod 7b is arranged vertically, and an upper fixing plate 7c and a lower fixing plate 7c are arranged and fixed on its top side from top to bottom. Plate 7d, the bottom side of which is threadedly connected with a fixing nut 7f; the single-sleeve rod 7a is a rod body with sleeves at both ends, so that its two ends are respectively sleeved on the first fixing rod 7g and the second fixing rod 7b; wherein, the top end of the second fixing rod 7b extends above the upper fixing plate 7c, so that a rubber buffer pad is sleeved on the top end of the second fixing rod 7b, and then the top end of the second fixing rod 7b is welded and fixed to the bottom surface of the separately set top corner of each photovoltaic panel frame 5; the sleeve on the single-sleeve rod 7a that matches the second fixing rod is sleeved on the second fixing rod, and the lower fixing plate 7d and the fixing nut 7f on the second fixing rod are respectively tightly pressed against the two ends of the sleeve.

[0027] See also Figure 5The double-pivot support 6 is arranged at the top corners of two adjacent photovoltaic panel frames 5 on the edge of the photovoltaic module 1, and is composed of a support platform connector and a second photovoltaic module connector support platform connector; the support platform connector includes a first fixing rod and a limiting cap arranged at the top end thereof; the first fixing rod is arranged vertically, and its bottom end is welded and fixed to the connection node of the support platform 3, and the limiting cap is threadedly connected and fixed to the top end of the first fixing rod; the second photovoltaic module connector includes a double-set rod 6a and two second fixing rods, each of which is arranged vertically, and an upper fixing plate and a lower fixing plate are arranged and fixed on its top side from top to bottom, and its bottom side is threadedly connected There is a fixing nut; the double sleeve rod 6a is a V-shaped rod body, and the two end portions of its open side are provided with sleeves respectively sleeved on the two second fixing rods, and the closed side end is provided with a sleeve sleeved on the first fixing rod; wherein, the top ends of the two second fixing rods extend above the upper fixing plate, so that a rubber buffer pad is sleeved on the top ends of the second fixing rods, and then the top ends of the second fixing rods are welded and fixed on the bottom surfaces of the top corners of the two adjacent photovoltaic panel frames 5; the two sleeves on the double sleeve rod 6a that match the second fixing rods are respectively sleeved on the two second fixing rods, and the lower fixing plate and the fixing nut on each second fixing rod are respectively tightly pressed against the two ends of the sleeve.

[0028] See also Figure 6 The four-point support 8 is arranged in the middle of the photovoltaic module 1 and below the four adjacent photovoltaic panel frames 5. It is composed of a support platform connector and a third photovoltaic module connector; the support platform connector includes a first fixing rod and a limiting cap arranged at the top thereof; the first fixing rod is arranged vertically, and its bottom end is welded and fixed to the connection node of the support platform 3, and the limiting cap is threadedly connected and fixed to the top of the first fixing rod; the third photovoltaic module connector includes four sets of rods 8a and four second fixing rods, each of which is arranged vertically, and an upper fixing plate and a lower fixing plate are arranged and fixed on its top side from top to bottom, and its bottom side is threadedly connected A fixing nut is connected; the four rods 8a are cross-shaped rod bodies, and their four ends are provided with sleeves respectively sleeved on the four second fixing rods, and the center is provided with a sleeve sleeved on the first fixing rod; wherein, the top ends of the two second fixing rods extend above the upper fixing plate, so that rubber buffer pads are sleeved on the top ends of the second fixing rods, and then the top ends of the second fixing rods are welded and fixed on the bottom surfaces of the top corners of the four adjacent photovoltaic panel frames 5; the four sleeves on the four rods 8a that match the second fixing rods are respectively sleeved on the four second fixing rods, and the lower fixing plate and the fixing nut on each second fixing rod are respectively tightly pressed against the two ends of the sleeve.

[0029] When in use, firstly weld and fix the first fixing rod of each supporting platform connecting member to each designated position on the top surface of the supporting platform 3, and weld and fix the top end of the second fixing rod in each photovoltaic module connecting member to the bottom surface at the top corner of each photovoltaic panel frame 5 of the photovoltaic module 1; then, lower the photovoltaic module 1 to the supporting platform 3, and make the sleeves on the single sleeve rod 7a, double sleeve rod 6a and four sleeve rod 8a that match the first fixing rod be respectively sleeved on each first fixing rod; then, install the limit cap on the top end of each first fixing rod to complete the connection between the photovoltaic module 1 and the supporting platform 3. The above-mentioned assembly process can also be that after welding and fixing the first fixing rod of each supporting platform connecting member to each designated position on the top surface of the supporting platform 3, first sleeve one end sleeve of the sleeve rod in each photovoltaic module connecting member is sleeved and fixed on the first fixing rod, and then lower the photovoltaic module 1 connected with the second fixing rod and the components thereon to the supporting platform 3, sleeve the second fixing rod and the other end sleeve of the corresponding sleeve rod and connect and fix, and complete the connection between the photovoltaic module 1 and the supporting platform 3.

[0030] See also Figure 2 and Figure 3 The support platform 3 is composed of an upper platform layer, a connecting beam body and a lower platform layer connected in sequence from top to bottom; the upper platform layer and the lower platform layer are both planar structures formed by connecting multiple connecting beams, and the connecting beam body is a vertical structure with a flat or inclined top surface formed by connecting multiple connecting beams; wherein, in order to ensure that there is sufficient connection strength between the photovoltaic module 1 and the support platform 3, the upper platform layer is formed by connecting multiple connecting beams, and the connection points between the connecting beams are connection nodes adapted to the top angle positions of the photovoltaic panel frames 5; the connection points between the connecting beams are formed by increasing the diameter of the connection points (such as the diameter of the welding points at the connection points) to form a reinforced structure at the connection points; specifically, the support platform 3 includes but is not limited to steel structures, concrete structures and composite structural systems.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A purlinless photovoltaic support structure, characterized in that: The invention is composed of a photovoltaic assembly (1), a point support assembly (2) and a support platform (3) which are arranged in sequence from top to bottom; wherein the photovoltaic assembly (1) is a rectangular integral structure composed of a plurality of photovoltaic panel frames (5) and a plurality of photovoltaic panels (4) respectively mounted in each photovoltaic panel frame (5); the point support assembly (2) is composed of a plurality of single-point supports (7), a plurality of double-point supports (6) and at least one four-point support (8); the single-point support (7) is arranged at the top corner of the photovoltaic panel frame (5) located at the top corner of the photovoltaic assembly (1), and is composed of a support platform connector and a first photovoltaic assembly connector; the support platform connector includes a first fixed The first photovoltaic module connector comprises a single sleeve rod (7a) and a second fixed rod, the top side of the second fixed rod is sleeved and fixed with an upper fixed plate and a lower fixed plate at intervals from top to bottom, and the bottom side is threadedly connected with a fixing nut; the single sleeve rod (7a) is a rod body with sleeves at both ends, so that its two ends are respectively sleeved on the first fixed rod and the second fixed rod through the sleeves; the double-point support (6) is arranged at the top corners of two adjacent photovoltaic panel frames (5) on the edge of the photovoltaic module (1), and is composed of a support platform connector and a second photovoltaic module connector; the support platform connector comprises the first fixed rod and the limiting cap at the top end; the second photovoltaic module connector comprises A double sleeve rod (6a) and two second fixing rods, each second fixing rod having an upper fixing plate and a lower fixing plate sleeved and fixed thereto at intervals from top to bottom on the top side, and a fixing nut threadedly connected to the bottom side; the double sleeve rod (6a) is a V-shaped rod body, and both end portions of the open side thereof are provided with sleeves sleeved on the two second fixing rods respectively, and the closed side end portion thereof is provided with a sleeve sleeved on the first fixing rod; a four-point support (8) is arranged in the middle of the photovoltaic module (1) and is located at the top corners of four adjacent photovoltaic panel frames (5), and is composed of a support platform connector and a third photovoltaic module connector; the support platform connector includes a first fixing rod and a limiting cap at its top end; the third photovoltaic module connector The invention comprises four sets of rods (8a) and four second fixing rods, wherein an upper fixing plate and a lower fixing plate are sleeved and fixed at intervals from top to bottom on the top side of each second fixing rod, and a fixing nut is threadedly connected to the bottom side thereof; the four sets of rods (8a) are cross-shaped rod bodies, and sleeves sleeved on the four second fixing rods are provided at the four ends thereof, respectively, and a sleeve sleeved on the first fixing rod is provided at the center thereof; the first fixing rod of each supporting platform connecting member is connected to the supporting platform (3), and the second fixing rod of each photovoltaic module connecting member is connected to the bottom surface of the photovoltaic panel frame (5), so that the photovoltaic module (1) is detachably fixed at each connection node on the top surface of the supporting platform (3) through the point-type supporting assembly (2).

2. The purlinless photovoltaic support structure according to claim 1, characterized in that: The photovoltaic panel frame (5) is a rectangular frame capable of assembling one or more photovoltaic panels (4).

3. The purlinless photovoltaic support structure according to claim 1 or 2, characterized in that: An inner annular boss is formed extending from the lower side of the inner frame edge of each photovoltaic panel frame (5) toward the center of the frame, so that the photovoltaic panel (4) is embedded in the photovoltaic panel frame (5) by being pressed onto the inner annular boss.

4. The purlinless photovoltaic support structure according to claim 3, characterized in that: An axilla corner plate (5a) is provided at the four top corners of the top surface of each photovoltaic panel frame (5), and the axilla corner plate (5a) is fixed to the photovoltaic panel frame (5), or to the photovoltaic panel (4) and the photovoltaic panel frame (5) through an axilla corner plate connector.

5. The purlinless photovoltaic support structure according to claim 4, characterized in that: The armpit angle plate connecting piece is a screw or a buckle with a two-way spacing adjustment function.

6. The purlinless photovoltaic support structure according to claim 1, characterized in that: In the supporting platform connecting member, the first fixing rod (7g) is arranged vertically, and its bottom end is welded or threadedly fixed to the connecting node of the supporting platform (3); the limiting cap (7h) is welded or threadedly fixed to the top of the first fixing rod (7g).

7. The purlinless photovoltaic support structure according to claim 1, characterized in that: In each photovoltaic module connector, the second fixing rod is welded or threadedly fixed to the bottom surface of the photovoltaic panel frame (5); a sleeve at one end of the sleeve rod is sleeved on the second fixing rod, and the lower fixing plate (7d) and the fixing nut (7f) are respectively tightly pressed against the two ends of the sleeve.

8. The purlinless photovoltaic support structure according to claim 1, characterized in that: A buffer pad is also arranged on the top surface of the upper connecting plate of each supporting platform connecting member.

9. The purlinless photovoltaic support structure according to claim 1, characterized in that: The supporting platform (3) is composed of an upper platform layer, a connecting beam body and a lower platform layer which are connected in sequence from top to bottom; the upper platform layer and the lower platform layer are both planar structures formed by connecting a plurality of connecting beams, and the connecting beam body is a vertical structure formed by connecting a plurality of connecting beams with a flat or inclined top surface.

10. The purlinless photovoltaic support structure according to claim 9, characterized in that: The upper platform layer is a planar structure formed by connecting a plurality of connecting beams, and the connecting points between the connecting beams are connecting nodes adapted to the top angle positions of the photovoltaic panel frames (5); and a reinforcement structure is provided at the connecting points between the connecting beams.