A foldable ladder structure system suitable for offshore photovoltaic facility maintenance

Abstract

The utility model discloses a kind of foldable ladder structure system suitable for offshore photovoltaic facility maintenance, belong to offshore photovoltaic power generation technical field, including being set on the fixed section of steel pipe pile, the folding section below fixed section and being folded upwards and the connecting node of the connecting fixed section and folding section, fixed section and folding section are all through bolt and the detachable connection of offshore photovoltaic facility's steel pipe pile;Connecting node includes the node plate welded on steel pipe pile, the second connecting angle steel of folding section top, the angle steel support welded on steel pipe pile and the round steel with hook welded on steel pipe pile;Wherein, node plate is reserved with bolt hole, oval hole is opened in second connecting angle steel along vertical direction, oval hole is threaded with the rotating bolt for connecting fixed section and folding section is set in.This utility model is especially suitable for offshore photovoltaic power station in shallow sea and deep sea area, for the auxiliary structure that maintenance personnel lands photovoltaic facility from ship and carries out maintenance operation.

Description

Technical Field

[0001] This utility model belongs to the field of offshore photovoltaic power generation technology, specifically relating to a foldable ladder structure system suitable for the maintenance of offshore photovoltaic facilities. Background Technology

[0002] As photovoltaic power generation becomes a technologically mature and widely used form of renewable energy, it is gradually breaking through the limitations of land areas and expanding into shallow and even deep-sea areas with richer resources.

[0003] Unlike traditional terrestrial photovoltaic systems, offshore photovoltaic (PV) facilities operate in a complex and harsh marine environment, presenting numerous unique challenges to their operation and maintenance. Maintenance personnel must reach the vicinity of the PV facilities by vessel and then use ladders to access the platform for inspection and repair. Currently, the traditional fixed ladder structures commonly used in the industry have significant drawbacks: the bottom of the ladder is constantly near sea level, subject to seawater immersion, wave impact, and salt spray erosion, resulting in extremely rapid corrosion. Furthermore, a large number of shellfish, algae, and other organisms in the marine environment easily adhere to and multiply on the ladder surface, further exacerbating corrosion and causing the ladder steps to become rough, uneven, and clogged.

[0004] Because offshore photovoltaic power plants have a design and operation cycle of up to 25 years, traditional fixed ladders are prone to corrosion and damage at the bottom structure, as well as loose steps, after long-term use. This not only seriously affects the safety of maintenance personnel landing, but may even lead to structural failure and inability to meet normal operation and maintenance needs. Furthermore, traditional ladders are mostly connected to steel pipe piles by on-site welding, resulting in low construction efficiency, difficulty in quality control, and difficulty in replacement when damaged, significantly increasing operation and maintenance costs and safety risks. Therefore, there is an urgent need for a new ladder structure system that can adapt to the harsh offshore environment and meet long-term operation and maintenance requirements. Utility Model Content

[0005] To address the problems of rust and damage to the bottom structure and loose steps of traditional fixed ladders, and to overcome the low construction efficiency, difficult quality control, and difficulty in replacement when damaged, which are often connected to steel pipe piles by on-site welding, this invention provides a foldable ladder structure system suitable for the maintenance of offshore photovoltaic facilities. It is particularly suitable for offshore photovoltaic power plants in shallow and deep sea areas, serving as an auxiliary structure for maintenance personnel to access the photovoltaic facilities from the vessel for maintenance work.

[0006] The technical solution adopted by this utility model for a foldable ladder structure system suitable for the maintenance of offshore photovoltaic facilities is as follows: A foldable ladder structure system suitable for the maintenance of offshore photovoltaic facilities includes a fixed section installed on a steel pipe pile, a folding section located below the fixed section and foldable upward, and a connecting node connecting the fixed section and the folding section. Both the fixed section and the folding section are detachably connected to the steel pipe pile of the offshore photovoltaic facility by bolts. The connection node includes a node plate welded to the steel pipe pile, a connecting angle steel located at the top of the folded section, an angle steel support welded to the steel pipe pile, and a round steel bar with a folded hook welded to the steel pipe pile; wherein, the node plate is provided with bolt holes, the connecting angle steel is provided with elliptical holes along the vertical direction, and a rotating bolt for connecting the fixed section and the folded section passes through the elliptical holes.

[0007] A further improvement of the present invention is that the fixing section includes two parallel first angle steel columns and multiple spaced first round steel steps, the two ends of the first round steel steps being welded and fixed to the two first angle steel columns respectively; the fixing section is bolted to the steel pipe pile through a first connecting angle steel.

[0008] A further improvement of the present invention is that the folding section includes two parallel second angle steel columns and multiple spaced second round steel steps, the two ends of which are welded and fixed to the two second angle steel columns respectively; the bottom of the folding section is provided with second angle steel legs, and the folding section is bolted to the steel pipe pile through second connecting angle steel.

[0009] A further improvement of this utility model is that the second angle steel leg is adapted to the angle steel support, and when the folded section is in the unfolded state, the second angle steel leg is supported on the steel pipe pile.

[0010] A further improvement of this utility model is that the rotating bolt includes a bolt head, a threaded section, and a rotating section located between the bolt head and the threaded section, wherein the rotating section has a smooth circular structure and no threads.

[0011] A further improvement of this utility model is that when the folded section is in a folded state, the folded section flips upward and is fixed to the steel pipe pile by the round steel with the folding hook.

[0012] A further improvement of this utility model is that the connection between the fixed section, the folding section and the steel pipe pile is achieved by bolts at the offshore construction site.

[0013] Due to the adoption of the above technical solution, the technical progress achieved by this utility model includes: This invention employs a foldable structure combining a fixed section and a folding section. During maintenance operations, the folding section is lowered for personnel to access the ladder; after the operation is completed, the folding section is flipped upwards and secured. This design allows the folding section to be removed from seawater immersion when not in use, fundamentally reducing the chance of seawater corrosion and marine organism attachment, effectively extending the ladder's service life, and solving the safety hazards caused by long-term corrosion of traditional fixed ladders.

[0014] In this invention, all welded components of the fixed and folding sections are standardized and manufactured in the factory. At the offshore construction site, assembly and connection are only required using bolts, eliminating the need for complex on-site welding. This not only improves construction efficiency and shortens the construction period but also ensures the stability of the structural processing quality. Furthermore, the bolted connection method allows for individual disassembly and replacement of each ladder component in case of later damage, significantly reducing maintenance costs.

[0015] This utility model uses connecting angle steel with elliptical holes and rotating bolts at the connection nodes. The smooth rotating section of the rotating bolt ensures that the folding section can be flipped flexibly and smoothly, while the elliptical hole design provides ample space for the folding section to flip. The angle steel legs at the bottom of the folding section are compatible with the steel pipe piles, providing stable support for the folding section in the unfolded state and preventing swaying when personnel climb up. In the folded state, it is fixed by round steel with folding hooks to prevent the folding section from swinging freely due to wind and waves, ensuring the structural stability of the ladder in both the use and non-use states and the safety of maintenance personnel when climbing up. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the installation structure of a foldable ladder structure system for the maintenance of offshore photovoltaic facilities on an offshore photovoltaic platform. Figure 2 This is a front view of the unfolded foldable ladder structure system for the maintenance of offshore photovoltaic facilities according to this utility model; Figure 3 This is a front view of a foldable ladder structure system for the maintenance of offshore photovoltaic facilities according to this utility model after folding. Figure 4 This is a side view of a foldable ladder structure system for the maintenance of offshore photovoltaic facilities, as described in this utility model, after being folded. Figure 5 and Figure 6 This is a structural schematic diagram of the fixed section of a foldable ladder structure suitable for the maintenance of offshore photovoltaic facilities according to this utility model. Figure 7 and Figure 8 This is a schematic diagram of the folding section of a foldable ladder structure suitable for the maintenance of offshore photovoltaic facilities according to this utility model. Figure 9This is a schematic diagram of a foldable ladder structure rotating bolt suitable for the maintenance of offshore photovoltaic facilities according to this utility model.

[0017] In the attached diagram: 1. Fixed section; 11. First angle steel column; 12. First round steel step; 13. First connecting angle steel; 2. Folding section; 21. Second angle steel column; 22. Second round steel step; 23. Second angle steel leg; 24. Second connecting angle steel; 3. Connection node; 31. Node plate; 32. Angle steel support; 33. Round steel with hook; 34. Elliptical hole; 4. Rotary bolt; 41. Bolt head; 42. Threaded section; 43. Rotary section; 5. Steel pipe piles. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments. In the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of this utility model.

[0019] Example 1 like Figures 1-4 As shown, this embodiment provides a foldable ladder structure system suitable for the maintenance of offshore photovoltaic facilities. It mainly consists of three parts: a fixed section 1, a folding section 2, and a connecting node 3. The overall structure is detachably connected to the steel pipe piles 5 of the offshore photovoltaic facility by bolts, so as to realize structural fixation and functional adjustment.

[0020] like Figures 1-6 As shown, in this embodiment, the fixed section 1 serves as the upper fixed structure of the ladder, mainly including two first angle steel columns 11 and multiple first round steel steps 12. The two first angle steel columns 11 are arranged in parallel, with a spacing consistent with the standard ladder width, ensuring convenient access for maintenance personnel. The spacing between adjacent steps is strictly controlled at 300mm to avoid discomfort caused by excessively large or small strides when climbing.

[0021] During the factory processing stage, the two ends of the first round steel step 12 are welded and fixed to the two first angle steel columns 11 respectively. The connection between the fixed section 1 and the steel pipe pile 5 is achieved through the first connecting angle steel 13, both ends of which have pre-drilled bolt holes in the factory. During offshore installation, the fixed section 1 is hoisted to the preset position of the steel pipe pile 5, and high-strength bolts are passed through the bolt holes of the first connecting angle steel 13 and fastened to the pre-embedded connectors on the steel pipe pile 5. At the same time, the first connecting angle steel 13 is also fastened to the fixed section 1 with high-strength bolts, thus firmly connecting the fixed section 1 to the steel pipe pile 5.

[0022] like Figure 7 and Figure 8 As shown, in this embodiment, the folding section 2 serves as the movable part of the ladder, including two second angle steel columns 21, multiple second round steel steps 22, and second angle steel support legs 23 at the bottom. The second angle steel columns 21 have the same specifications as the first angle steel columns 11, and the spacing between the second round steel steps 22 is also 300mm, maintaining the same arrangement density as the steps in the fixed section 1, ensuring smooth transition for personnel going up and down.

[0023] During factory processing, the welding process between the second round steel step 22 and the second angle steel column 21 is the same as that of the fixed section 1. A second angle steel leg 23 is welded to the lower end of each of the two second angle steel columns 21 at the bottom of the folding section 2. The length of the second angle steel leg 23 is determined according to the position of the angle steel support 32 on the steel pipe pile 5, ensuring that the second angle steel leg 23 can accurately support the angle steel support 32 when the folding section 2 is unfolded. The folding section 2 is bolted to the steel pipe pile 5 via a second connecting angle steel 24.

[0024] like Figures 4-9 As shown, in this embodiment, the connecting node 3 is the core part that realizes the connection and folding function between the fixed section 1 and the folding section 2. It mainly includes a node plate 31, a connecting angle steel, a rotating bolt 4, an angle steel support 32, and a round steel with a folding hook 33.

[0025] The node plate 31 is pre-welded to the connection position between the fixed section 1 and the folding section 2 in the steel pipe pile 5 processing plant. Two bolt holes are reserved on the node plate 31 for connection with the first connecting angle steel 13 or the second connecting angle steel 24. The second connecting angle steel 24 at the top of the folding section 2 has an elliptical hole 34 vertically. The major axis of the elliptical hole 34 is vertical, providing a margin of movement for the folding section 2 to flip.

[0026] The rotating bolt 4 is a high-strength bolt, and its structure includes a bolt head 41, a threaded section 42, and a rotating section 43 located between the two. The surface of the rotating section 43 is polished to form a smooth round structure without threads, ensuring that the folded section 2 rotates smoothly and without obstruction around the bolt. During installation, the rotating bolt 4 passes through the elliptical hole 34 of the second connecting angle steel 24 and the bolt hole of the node plate 31, and is tightened with a nut. A spring washer is installed between the nut and the second connecting angle steel 24 to prevent loosening.

[0027] Angle steel support 32 is welded and fixed at the position of the second angle steel leg 23 at the bottom of the folded section 2 of the steel pipe pile 5. The top surface of angle steel support 32 remains horizontal. When the folded section 2 is unfolded, the second angle steel leg 23 is just supported on the support, forming a stable force support point and distributing the vertical load borne by the folded section 2. One end of the round steel bar 33 with a folding hook is welded to the fixed position of the folded section 2 after it is flipped upwards, and the other end is bent upwards to form a folding hook. When the folded section 2 is flipped upwards, the second round steel step 22 of the folded section 2 can be inserted into the folding hook to achieve reliable fixation of the folded section 2.

[0028] In this embodiment, during installation and use, the first angle steel column 11, the first round steel step 12, and the first connecting angle steel 13 of the fixed section 1 are first processed according to the design dimensions, and the second angle steel column 21, the second round steel step 22, the second angle steel leg 23, and the second connecting angle steel 24 of the folding section 2 are processed. At the same time, the rotating bolts 4 required for the connecting node 3 are processed. In the steel pipe pile 5 processing plant, the node plate 31, the angle steel support 32, and the round steel with hook 33 are welded to the preset position of the steel pipe pile 5, and all welded nodes are treated with anti-corrosion.

[0029] Then, the finished fixed section 1, folding section 2 and related connectors are transported to the dock for pre-assembly inspection. All components are transported to the offshore construction site by transport ship. The fixed section 1 is hoisted to the corresponding height of the steel pipe pile 5 by crane and fastened to the node plate 31 by bolts. Subsequently, the folding section 2 is hoisted, and its top connecting angle steel is connected to the fixed section 1 by rotating bolts 4. The bottom second angle steel support leg 23 is aligned with the angle steel support 32 to complete the overall installation.

[0030] When maintenance work is required, maintenance personnel arrive at the site by boat, unfasten the round steel bar 33 with folding hooks that secures the folding section 2, and flip the folding section 2 downwards around the rotating bolt 4 until the second angle steel leg 23 is supported on the angle steel support 32. At this time, the folding section 2 is in the unfolded state, allowing personnel to disembark from the boat onto the photovoltaic facility. After the maintenance work is completed, personnel evacuate to the boat, flip the folding section 2 upwards, and then secure the folding section 2 again with the round steel bar 33 with folding hooks to complete the folding and storage.

[0031] In the above embodiments, this utility model provides a foldable ladder structure system suitable for the maintenance of offshore photovoltaic facilities. This utility model adopts a foldable structure combining a fixed section and a folding section. During maintenance operations, the folding section is lowered for personnel to access the site; after the work is completed, the folding section is flipped upwards and fixed. This design allows the folding section to be removed from the seawater immersion range when not in use, fundamentally reducing the chance of seawater corrosion and marine organism attachment, effectively extending the service life of the ladder, and solving the safety hazards caused by long-term corrosion of traditional fixed ladders. All welded components of the fixed and folding sections in this utility model are standardized and manufactured in the factory; at the offshore construction site, only bolts are needed for assembly and connection, eliminating the need for complex on-site welding operations. This design not only improves construction efficiency and shortens the construction period, but also ensures the stability of structural processing quality. Simultaneously, the bolted connection method allows for individual disassembly and replacement of each ladder component in case of later damage, significantly reducing maintenance costs. The connection nodes utilize connecting angle steel with elliptical holes in conjunction with rotating bolts. The smooth, round rotating section of the rotating bolt ensures smooth and flexible folding of the folding section, while the elliptical hole design provides ample space for this folding section's rotation. The angle steel legs at the bottom of the folding section are compatible with the steel pipe piles, providing stable support for the folding section in its unfolded state and preventing swaying when personnel climb it. In its folded state, it is fixed by round steel with folding hooks to prevent the folding section from swinging arbitrarily due to wind and waves, ensuring the structural stability of the ladder in both in-use and out-of-use states and the safety of maintenance personnel when climbing.

[0032] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A foldable ladder structure system suitable for the maintenance of offshore photovoltaic facilities, characterized in that: It includes a fixed section (1) set on the steel pipe pile (5), a folding section (2) located below the fixed section (1) and foldable upward, and a connecting node (3) connecting the fixed section (1) and the folding section (2). The fixed section (1) and the folding section (2) are detachably connected to the steel pipe pile (5) of the offshore photovoltaic facility by bolts. The connecting node (3) includes a node plate (31) welded to the steel pipe pile (5), a second connecting angle steel (24) provided on the top of the folded section (2), an angle steel support (32) welded to the steel pipe pile (5), and a round steel with a folded hook (33) welded to the steel pipe pile (5); wherein, the node plate (31) is provided with bolt holes, and the second connecting angle steel (24) is provided with an elliptical hole (34) in the vertical direction, and a rotating bolt (4) for connecting the fixed section (1) and the folded section (2) is provided in the elliptical hole (34).

2. The foldable ladder structure system for maintenance of offshore photovoltaic facilities according to claim 1, characterized in that: The fixed section (1) includes two parallel first angle steel columns (11) and multiple spaced first round steel steps (12). The two ends of the first round steel steps (12) are welded and fixed to the two first angle steel columns (11) respectively. The fixed section (1) is bolted to the steel pipe pile (5) through a first connecting angle steel (13).

3. A foldable ladder structure system for the maintenance of offshore photovoltaic facilities according to claim 1, characterized in that: The folding section (2) includes two parallel second angle steel columns (21) and multiple spaced second round steel steps (22). The two ends of the second round steel steps (22) are welded and fixed to the two second angle steel columns (21) respectively. The bottom of the folding section (2) is provided with second angle steel legs (23). The folding section (2) is bolted to the steel pipe pile (5) through second connecting angle steel (24).

4. A foldable ladder structure system for the maintenance of offshore photovoltaic facilities according to claim 3, characterized in that: The second angle steel leg (23) is adapted to the angle steel support (32). When the folding section (2) is in the unfolded state, the second angle steel leg (23) is supported on the angle steel support (32).

5. A foldable ladder structure system for the maintenance of offshore photovoltaic facilities according to claim 1, characterized in that: The rotating bolt (4) includes a bolt head (41), a threaded section (42), and a rotating section (43) located between the bolt head (41) and the threaded section (42). The rotating section (43) is a smooth round structure and has no threads.

6. A foldable ladder structure system for the maintenance of offshore photovoltaic facilities according to claim 1, characterized in that: When the folded section (2) is in a folded state, the folded section (2) flips upward and is fixed to the steel pipe pile (5) by the round steel with folding hook (33).

7. A foldable ladder structure system for maintenance of offshore photovoltaic facilities according to any one of claims 1-6, characterized in that: The connection between the fixed section (1), the folded section (2) and the steel pipe pile (5) is achieved by bolts at the offshore construction site.

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