Offshore photovoltaic large-diameter combined pile and construction method thereof

Abstract

The invention provides an offshore photovoltaic large-diameter combined pile and a construction method thereof, and belongs to the technical field of pile foundation engineering. The supporting truss is connected to the concrete precast pile section in a sleeving mode, the limiting truss and the supporting truss are in butt joint in the axial direction of the concrete precast pile section, the periphery of the supporting truss is covered with a circle of cylinder cover part, and a suction cylinder is formed; the combined pile has the beneficial effects that the concrete precast pile section is matched with the suction barrel, so that the contact area between the combined pile and a soil body is increased, and the anti-overturning performance and the bending resistance are greatly enhanced; the pile diameter and the steel bar consumption can be reduced; water in the suction barrel is pumped through the water pump so as to control sinking of the combined pile, and the requirement for using a professional pile driving barge is omitted.

Description

Technical Field

[0001] The present invention belongs to the technical field of pile foundation engineering and relates to an offshore photovoltaic large-diameter composite pile and a construction method thereof. Background Art

[0002] Piles, with their high bearing capacity and minimal settlement, are widely used in various geological engineering projects and are particularly suitable for construction on soft soils. As the core support structure for photovoltaic systems, prestressed concrete photovoltaic pile foundations, composed of steel pipes, reinforcement, concrete, and end plates, combine high strength, durability, wind load resistance, and economic efficiency, significantly improving construction efficiency.

[0003] Traditional photovoltaic piles utilize prestressed, high-strength concrete tubular piles with a uniform cross-section. In tidal flats and offshore environments, wave and current forces exert a maximum bending moment at a point 3-4 times the pile diameter below the mud surface. Due to this uniform cross-section, the entire length of the pile must be reinforced to meet the maximum bending moment, resulting in redundant material. Furthermore, while increasing the pile diameter improves bending capacity, wave and current forces are positively correlated with pile diameter, exacerbating structural stresses and creating a paradox where increasing diameter increases load.

[0004] The transportation and construction of offshore photovoltaic piles are difficult, requiring the use of large ships and professional piling ships. The equipment rental costs are high (for example, the daily rental of a piling ship can reach hundreds of thousands of yuan), resulting in overall construction costs much higher than onshore projects. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose an offshore photovoltaic large-diameter composite pile and a construction method thereof.

[0006] The purpose of the present invention can be achieved through the following technical solutions: An offshore photovoltaic large-diameter composite pile, comprising:

[0007] A precast concrete pile segment; a supporting truss, the supporting truss being sleeved on the precast concrete pile segment, the outer periphery of the supporting truss being covered with a circle of tube cover portion and the two being combined to form a suction cylinder, a through hole being provided at the center of the tube cover portion for the precast concrete pile segment to pass through, and the inner edge of the tube cover portion corresponding to the through hole is sealed and fitted with the outer peripheral surface of the precast concrete pile segment.

[0008] Preferably, it also includes a limiting truss, which is sleeved on the precast concrete pile segment, and the limiting truss and the supporting truss are connected in the axial direction of the precast concrete pile segment, and the combination formed by the limiting truss and the supporting truss is axially fixedly connected to the precast concrete pile segment.

[0009] Preferably, the precast concrete pile section is provided with a bamboo section protruding along its radial direction, and non-prestressed bent steel bars are embedded in the bamboo section. The limiting truss is sleeved on one end of the bamboo section, and the supporting truss is sleeved on the other end of the bamboo section. The combination formed by the limiting truss and the supporting truss is clamped with the bamboo section.

[0010] Preferably, a first protective plate is provided between the limiting truss and the bamboo section, a second protective plate is provided between the supporting truss and the bamboo section, and a third protective plate is provided between the part of the precast concrete pile section located inside the suction cylinder and the supporting truss.

[0011] Preferably, the limiting truss includes a plurality of limiting ribs, each of which is evenly arranged around the circumference of the precast concrete pile segment, and the supporting truss includes a plurality of supporting ribs, each of which is evenly arranged around the circumference of the precast concrete pile segment.

[0012] Preferably, the two ends of the bamboo node are provided with a conical transition structure which gradually narrows toward the end, and the circumferential surfaces of the two ends of the bamboo node are respectively provided with a first conical surface portion and a second conical surface portion; the inner side surface of the limiting rib is provided with a first inclined surface portion which is complementary to the contour of the first conical surface portion, and the first inclined surface portion is fitted with the first conical surface portion; the inner side surface of the supporting rib is provided with a second inclined surface portion which is complementary to the contour of the second conical surface portion, and the second inclined surface portion is fitted with the second conical surface portion.

[0013] Preferably, the number of the limiting ribs and the supporting ribs is the same and they are arranged in one-to-one correspondence, the bottom of the limiting ribs is fixedly connected to the top of the supporting ribs, and the inner side surfaces of the limiting ribs and the inner side surfaces of the supporting ribs are combined to complement the outer peripheral contour of the bamboo node.

[0014] Preferably, each of the supporting ribs divides the interior of the suction cylinder into a plurality of silos, and each of the silos is distributed along the circumference of the precast concrete pile segment.

[0015] Preferably, it further comprises a water pumping pipe, the number of the water pumping pipes is consistent with the number of the silos and is arranged in a one-to-one correspondence, and one end of the water pumping pipe passes through the silo cover and penetrates into the silo.

[0016] A method for constructing large-diameter composite offshore photovoltaic piles comprises the following steps:

[0017] S1: Weld the non-prestressed bent steel bars and the steel cage together, and then centrifugally cast the precast concrete pile segments.

[0018] S2: Install a first protective plate inside the limiting truss, install a second protective plate inside the supporting truss, then insert the limiting truss from one end of the precast concrete pile segment, one end of the bamboo section on the precast concrete pile segment clamps the limiting truss, and the first protective plate is cushioned between the outer circumference of the precast concrete pile segment and the limiting truss. Then, insert the suction cylinder from the other end of the precast concrete pile segment, the other end of the bamboo section on the precast concrete pile segment clamps the supporting truss, and the second protective plate is cushioned between the outer circumference of the precast concrete pile segment and the supporting truss.

[0019] S3: Splice the limiting truss and the supporting truss together so that the suction cylinder and the precast concrete pile segment are locked in the axial direction, thereby obtaining a composite pile;

[0020] S4: Use a lifting vessel to lift the modular pile to the designated location, then insert multiple pumping pipes into the various silos of the suction cylinder, and then pump water through each pumping pipe to sink the modular pile below the mud surface;

[0021] S5: Adjust the pumping state of each pumping pipe according to the verticality of the combined pile. When the combined pile reaches the set depth, pull out each pumping pipe and seal the hole on the suction cylinder.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The combination of precast concrete pile segments and suction cylinders increases the contact area between the composite pile and the soil, and greatly enhances the anti-overturning performance and bending resistance. The limiting trusses and supporting trusses provide support points for the precast concrete pile segments, further enhancing the bending bearing capacity of the pile segments, and can reduce the pile diameter and the amount of steel bars used.

[0024] 2. The concrete precast pile segments are sunk to the seabed surface under their own weight. A water pump is then activated to extract water from the suction cylinder, creating a pressure differential between the inside and outside. This negative pressure forces the concrete precast pile segments to continuously penetrate the mud surface. The pump extracts water from the suction cylinder, controlling the sinking of the composite piles and eliminating the need for specialized piling vessels. This process requires no vibration or hammering, eliminating the need to rent a piling vessel and saving on piling costs. Only a transport vessel and a crane vessel are required.

[0025] 3. The purpose of providing the bamboo section is to increase the local diameter of the precast concrete pile section, thereby enhancing the bending resistance of the corresponding part of the precast concrete pile section. The bamboo section is located at the position where the precast concrete pile section is subjected to the maximum bending moment, and the suction cylinder is clamped with the bamboo section, so that the suction cylinder is also located at the position where the precast concrete pile section is subjected to the maximum bending moment, further improving the bending resistance of the corresponding position.

[0026] 4. The bamboo section can limit the downward sliding of the limit truss, and the bamboo section can limit the upward sliding of the support truss. When the limit truss and the support truss are spliced ​​together, the structure formed by the two is clamped together with the bamboo section, so that the suction cylinder is fixedly connected to the bamboo section in the circumferential direction.

[0027] 5. Each silo can independently control the pumping rate and negative pressure value, dynamically adjust the sinking force according to different soil types, avoid uneven settlement caused by overall pumping, and greatly improve the verticality of the pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the internal structure of the combined pile of the present invention.

[0029] Figure 2 It is a structural exploded view of the combined pile of the present invention.

[0030] Figure 3 It is a schematic diagram of the connection relationship between the limiting truss and the supporting truss of the present invention.

[0031] Figure 4 It is a structural schematic diagram of the bamboo node part of the present invention.

[0032] Figure 5 It is a structural schematic diagram of the suction cylinder of the present invention.

[0033] In the figure, 100, precast concrete pile segment; 110, bamboo joint; 111, first conical surface; 112, second conical surface; 120, non-prestressed bent steel bar; 130, third protection plate; 200, limiting truss; 210, first protection plate; 220, limiting rib; 221, first inclined surface; 300, suction cylinder; 310, silo; 320, pumping pipe; 400, supporting truss; 410, second protection plate; 420, supporting rib; 421, second inclined surface; 500, cylinder cover. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0035] like Figures 1 to 5 As shown, an offshore photovoltaic large-diameter combined pile includes:

[0036] Precast concrete pile segment 100;

[0037] The support truss 400 is sleeved on the precast concrete pile segment 100. The outer periphery of the support truss 400 is covered with a circle of tube cover 500 and the two are combined to form a suction tube 300. A through hole is provided in the center of the tube cover 500, and the precast concrete pile segment 100 passes through the through hole, and the inner edge of the tube cover 500 corresponding to the through hole is sealed and fitted with the outer peripheral surface of the precast concrete pile segment 100.

[0038] On the basis of the above embodiment, it also includes a limiting truss 200, which is sleeved on the precast concrete pile segment 100, and the limiting truss 200 and the supporting truss 400 are connected in the axial direction of the precast concrete pile segment 100, and the combination formed by the limiting truss 200 and the supporting truss 400 is axially fixedly connected to the precast concrete pile segment 100.

[0039] The precast concrete pile segment 100 serves as the vertical load-bearing body of the overall structure, bearing the load of the upper photovoltaic array and the lateral forces of the marine environment (wind, waves, and ocean currents). The precast concrete pile segment 100 is hollow inside to reduce its own weight. The suction cylinder 300 is composed of a support truss 400 and a cylinder cover 500. The cylinder cover 500 is similar to a skin structure. The edge of the through hole of the cylinder cover 500 is sealed with the outer peripheral surface of the precast concrete pile segment 100, so that the cylinder cover 500 and the seabed or soil surface are enclosed to form a closed cavity. The water in the sealed cavity can be pumped out by a water pump to form a negative pressure chamber.

[0040] During the installation of the composite pile, the concrete precast pile segment 100 is sunk to the seabed surface by its own weight, and then the water pump is started to extract the water in the suction cylinder 300 to form an internal and external pressure difference, thereby forcing the concrete precast pile segment 100 to continuously penetrate the mud surface through negative pressure. This process does not require vibration or hammering, eliminates the need to rent a pile-driving ship, and saves pile driving costs. Only a transport ship and a lifting ship are required.

[0041] The precast concrete pile segment 100 cooperates with the suction cylinder 300 to increase the contact area between the composite pile and the soil, and greatly enhances the anti-overturning performance and bending resistance. The limiting truss 200 and the supporting truss 400 provide support points for the precast concrete pile segment 100, further enhancing the bending bearing capacity of the pile segment, and can reduce the pile diameter and the amount of steel bars used. The water in the suction cylinder 300 is extracted by a water pump to control the sinking of the composite pile, eliminating the need for a professional pile-driving ship.

[0042] Based on the above embodiment, the precast concrete pile segment 100 is provided with a bamboo section 110 protruding along its radial direction, and non-prestressed bent steel bars 120 are buried inside the bamboo section 110. The combination formed by the limiting truss 200 and the supporting truss 400 is clamped with the bamboo section 110.

[0043] The purpose of providing the bamboo section 110 is to increase the local diameter of the precast concrete pile segment 100, so as to enhance the bending resistance of the corresponding part of the precast concrete pile segment 100. The bamboo section 110 is located at the position where the precast concrete pile segment 100 is subjected to the maximum bending moment, and the suction cylinder 300 is engaged with the bamboo section 110, so that the suction cylinder 300 is also located at the position where the precast concrete pile segment 100 is subjected to the maximum bending moment, further improving the bending resistance of the corresponding position.

[0044] Since the bamboo node 110 is a radially protruding structure, the bamboo node 110 can limit the limiting truss 200 from sliding downward, and the bamboo node 110 can limit the supporting truss 400 from sliding upward. When the limiting truss 200 and the supporting truss 400 are spliced ​​together, the structure formed by the two is clamped together with the bamboo node 110, so that the suction cylinder 300 is fixedly connected to the bamboo node 110 in a circumferential direction.

[0045] During actual construction, the suction force generated by pumping water causes the cylinder to sink below the mud surface. At the same time, the combination formed by the limiting truss 200 and the supporting truss 400 clamps the bamboo section 110 of the pile body, driving the combined pile to sink below the mud surface together, and the force transmission effect is reliable; in addition, the non-prestressed bent steel bars 120 help to improve the shear resistance of the pile body.

[0046] On the basis of the above embodiment, the limiting truss 200 is sleeved on one end of the bamboo section 110, the supporting truss 400 is sleeved on the other end of the bamboo section 110, a first protective plate 210 is provided between the limiting truss 200 and the bamboo section 110, a second protective plate 410 is provided between the supporting truss 400 and the bamboo section 110, and a third protective plate 130 is provided between the part of the precast concrete pile section 100 located inside the suction cylinder 300 and the supporting truss 400.

[0047] The first and second protective plates 210 and 410 are made of polytetrafluoroethylene (PTFE), ensuring a tight fit between the pile and the truss. The use of PTFE not only ensures a more even distribution of stress across the structure, effectively distributing the load, but also significantly reduces localized stress concentrations caused by bumps and other impacts, thereby preventing potential structural damage.

[0048] The third protective plate 130 is a polytetrafluoroethylene (PTFE) plate. The third protective plate 130 serves as a flexible buffer layer between the horizontal rod portion of the support truss 400 and the concrete pile section, playing a protective role, dispersing local concentrated stress, avoiding concrete surface crushing or microcrack expansion, and significantly improving the fatigue resistance of the node.

[0049] like Figures 1 to 3As shown, based on the above embodiment, the limiting truss 200 includes a plurality of limiting ribs 220, and each limiting rib 220 is evenly arranged around the circumference of the precast concrete pile segment 100, and the supporting truss 400 includes a plurality of supporting ribs 420, and each supporting rib 420 is evenly arranged around the circumference of the precast concrete pile segment 100.

[0050] A protective plate (such as a polytetrafluoroethylene plate) is installed between the ribs and the pile body, forming a composite interface of "rigid support and flexible buffering." This not only enhances the pile's bending resistance but also prevents localized damage caused by stress concentration. This design is particularly suitable for the long-term effects of complex alternating loads such as waves and currents in marine environments.

[0051] like Figures 1 to 4 As shown, on the basis of the above embodiment, the two ends of the bamboo joint portion 110 are provided with a conical transition structure that gradually narrows toward the end direction, and the circumferential surfaces of the two ends of the bamboo joint portion 110 are respectively provided with a first conical portion 111 and a second conical portion 112; the inner side surface of the limiting rib 220 is provided with a first inclined portion 221 that is complementary to the contour of the first conical portion 111, and the first inclined portion 221 is fitted with the first conical portion 111; the inner side surface of the supporting rib 420 is provided with a second inclined portion 421 that is complementary to the contour of the second conical portion 112, and the second inclined portion 421 is fitted with the second conical portion 112.

[0052] Because the bamboo section 110 has a tapered transition structure at both ends, it forms a first tapered surface 111 and a second tapered surface 112. These first tapered surface 111 and second tapered surface 112, respectively, form axial restraints with the first sloped surface 221 and second sloped surface 421, preventing the restraining truss 200 from sliding downward and the supporting truss 400 from sliding upward. During installation, the sliding contact between the tapered and sloped surfaces automatically corrects any misalignment between the truss and the pile axis.

[0053] On the basis of the above embodiment, the number of the limiting ribs 220 and the supporting ribs 420 is the same and they are arranged in one-to-one correspondence. The bottom of the limiting ribs 220 is fixedly connected to the top of the supporting ribs 420. The inner side surfaces of the limiting ribs 220 and the inner side surfaces of the supporting ribs 420 are combined to complement the outer peripheral surface contour of the bamboo node portion 110, thereby making the combination snap-fitted to the bamboo node portion 110.

[0054] like Figure 1 As shown, based on the above embodiment, each supporting rib 420 divides the interior of the suction cylinder 300 into a plurality of silos 310 , and each silo 310 is distributed along the circumference of the precast concrete pile segment 100 .

[0055] Each silo 310 can independently control the pumping rate and negative pressure value, dynamically adjust the sinking force according to different soil types, avoid uneven settlement caused by overall pumping, and significantly improve the verticality of the pile.

[0056] On the basis of the above embodiment, it further includes a water pumping pipe 320 , the number of which is consistent with the number of silos 310 and is arranged in a one-to-one correspondence, and one end of the water pumping pipe 320 passes through the silo cover 500 and penetrates into the silo 310 .

[0057] Each silo 310 independently controls the drainage rate and negative pressure value through a dedicated pumping pipe 320. During the pumping process, the pumping situation of the corresponding silo 310 can be controlled according to the settlement of the pile body, thereby improving the vertical accuracy of the pile body.

[0058] like Figures 1 to 5 As shown, a method for constructing large-diameter composite piles for offshore photovoltaic power generation includes the following steps:

[0059] S1: Welding the non-prestressed bent steel bars 120 and the steel cage together, and then centrifugally pouring the precast concrete pile segment 100;

[0060] S2: Install a first protective plate 210 inside the limiting truss 200, and install a second protective plate 410 inside the supporting truss 400. Then, insert the limiting truss 200 from one end of the precast concrete pile segment 100, and clamp one end of the bamboo section 110 on the precast concrete pile segment 100 to the limiting truss 200. The first protective plate 210 is padded between the outer circumference of the precast concrete pile segment 100 and the limiting truss 200. Then, insert the suction cylinder 300 from the other end of the precast concrete pile segment 100, and clamp the other end of the bamboo section 110 on the precast concrete pile segment 100 to the supporting truss 400. The second protective plate 410 is padded between the outer circumference of the precast concrete pile segment 100 and the supporting truss 400.

[0061] S3: Splicing the limiting truss 200 and the supporting truss 400 together, so that the suction cylinder 300 and the precast concrete pile segment 100 are locked in the axial direction, thereby obtaining a combined pile;

[0062] S4: The assembled pile is hoisted to the designated location using a lifting vessel, and then a plurality of pumping pipes 320 are respectively inserted into the respective silos 310 of the suction cylinder 300 . Water is then pumped through the respective pumping pipes 320 to sink the assembled pile below the mud surface.

[0063] S5: Adjust the pumping state of each pumping pipe 320 according to the verticality of the combined pile. When the combined pile reaches the set depth, pull out each pumping pipe 320 and seal the hole on the suction cylinder 300.

[0064] After welding the non-prestressed bent steel bars 120 to the steel cage, a centrifugal casting process is used to produce a concrete pile segment with bamboo sections 110, ensuring structural density and crack resistance. The limiting truss 200 (including the first protective plate 210) and the suction cylinder 300 (including the second protective plate 410) are pre-installed on land. The bamboo sections 110 securely connect the suction cylinder 300 to the concrete pile segment axially. This design allows for assembly and facilitates mass production and installation. The lifting vessel lowers the entire structure into the target sea area, independently pumping water through multiple silos 310, using negative pressure to steadily sink the pile, and adjusting its verticality in real time until it reaches the designed elevation.

[0065] The suction cylinder 300's negative pressure sinking replaces traditional piling vessels, eliminating the need for expensive specialized vessels. The truss and suction cylinder 300 are pre-assembled on land, and offshore installation requires only hoisting and pumping. This streamlines the process and provides strong all-weather adaptability. The limiting truss 200 and supporting truss 400 provide support points, while the bamboo sections 110 and truss work together to resist bending. The suction cylinder 300 and concrete piles work together to resist horizontal loads.

[0066] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0067] In addition, terms such as "first," "second," and "an" in the present invention are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly specified and limited.

[0069] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. An offshore photovoltaic large-diameter composite pile, characterized in that: include: A precast concrete pile segment (100); a support truss (400), wherein the support truss (400) is sleeved on the precast concrete pile segment (100); the outer periphery of the support truss (400) is covered with a circle of cylinder cover (500), and the two are combined to form a suction cylinder (300); a through hole for the precast concrete pile segment (100) to pass through is provided at the center of the cylinder cover (500); and the inner edge of the cylinder cover (500) corresponding to the through hole is sealed and fitted with the outer peripheral surface of the precast concrete pile segment (100).

2. The offshore photovoltaic large-diameter composite pile according to claim 1, characterized in that: The invention also includes a limiting truss (200), wherein the limiting truss (200) is sleeved on the precast concrete pile segment (100), the limiting truss (200) and the supporting truss (400) are butted together in the axial direction of the precast concrete pile segment (100), and the assembly formed by the limiting truss (200) and the supporting truss (400) is axially fixedly connected to the precast concrete pile segment (100).

3. The offshore photovoltaic large-diameter composite pile according to claim 2, characterized in that: The concrete prefabricated pile section (100) is provided with a bamboo section (110) protruding along its radial direction, and a non-prestressed bent steel bar (120) is embedded in the bamboo section (110). The limiting truss (200) is sleeved on one end of the bamboo section (110), and the supporting truss (400) is sleeved on the other end of the bamboo section (110). The assembly formed by the limiting truss (200) and the supporting truss (400) is clamped with the bamboo section (110).

4. The offshore photovoltaic large-diameter composite pile according to claim 3, characterized in that: A first protective plate (210) is provided between the limiting truss (200) and the bamboo joint (110), a second protective plate (410) is provided between the supporting truss (400) and the bamboo joint (110), and a third protective plate (130) is provided between the portion of the precast concrete pile section (100) located inside the suction cylinder (300) and the supporting truss (400).

5. The offshore photovoltaic large-diameter composite pile according to claim 3, characterized in that: The limiting truss (200) includes a plurality of limiting ribs (220), each of which is evenly arranged around the circumference of the precast concrete pile segment (100); and the supporting truss (400) includes a plurality of supporting ribs (420), each of which is evenly arranged around the circumference of the precast concrete pile segment (100).

6. The offshore photovoltaic large-diameter composite pile according to claim 5, characterized in that: The two ends of the bamboo joint (110) are provided with a conical transition structure that gradually narrows toward the end, and the circumferential surfaces of the two ends of the bamboo joint (110) are respectively provided with a first conical portion (111) and a second conical portion (112); the inner side surface of the limiting rib (220) is provided with a first inclined portion (221) that is complementary to the outline of the first conical portion (111), and the first inclined portion (221) is fitted with the first conical portion (111); the inner side surface of the supporting rib (420) is provided with a second inclined portion (421) that is complementary to the outline of the second conical portion (112), and the second inclined portion (421) is fitted with the second conical portion (112).

7. The offshore photovoltaic large-diameter composite pile according to claim 6, characterized in that: The number of the limiting ribs (220) and the supporting ribs (420) is the same and they are arranged in a one-to-one correspondence. The bottom of the limiting ribs (220) is fixedly connected to the top of the supporting ribs (420). The inner side surfaces of the limiting ribs (220) and the inner side surfaces of the supporting ribs (420) are combined to complement the outer peripheral surface contour of the bamboo section (110).

8. The offshore photovoltaic large-diameter composite pile according to claim 5, characterized in that: Each of the supporting ribs (420) divides the interior of the suction cylinder (300) into a plurality of silos (310), and each of the silos (310) is distributed along the circumference of the precast concrete pile segment (100).

9. The offshore photovoltaic large-diameter composite pile according to claim 8, characterized in that: It also includes a water pumping pipe (320), the number of which is consistent with the number of the silos (310) and is arranged in a one-to-one correspondence, and one end of the water pumping pipe (320) passes through the silo cover (500) and penetrates into the silo (310).

10. A method for constructing offshore photovoltaic large-diameter composite piles according to any one of claims 1 to 9, characterized in that: The steps are as follows: S1: welding the non-prestressed bent steel bars (120) and the steel cage together, and then centrifugally pouring the precast concrete pile segments (100); S2: Install a first protective plate (210) inside the limiting truss (200), install a second protective plate (410) inside the supporting truss (400), then insert the limiting truss (200) from one end of the concrete precast pile segment (100), one end of the bamboo section (110) on the concrete precast pile segment (100) clamps the limiting truss (200), and the first protective plate (210) is padded between the outer circumference of the concrete precast pile segment (100) and the limiting truss (200), then insert the suction cylinder (300) from the other end of the concrete precast pile segment (100), the other end of the bamboo section (110) on the concrete precast pile segment (100) clamps the supporting truss (400), and the second protective plate (410) is padded between the outer circumference of the concrete precast pile segment (100) and the supporting truss (400); S3: splicing the limiting truss (200) and the supporting truss (400) together, so that the suction cylinder (300) and the precast concrete pile segment (100) are locked in the axial direction, thereby obtaining a combined pile; S4: Using a lifting vessel to lift the combined pile to a designated location, and then inserting a plurality of pumping pipes (320) into each silo (310) of the suction cylinder (300), and then pumping water through each pumping pipe (320) to sink the combined pile below the mud surface; S5: adjusting the pumping state of each pumping pipe (320) according to the verticality of the combined pile, and when the combined pile reaches the set depth position, pulling out each pumping pipe (320) and sealing the hole on the suction cylinder (300).

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