A diameter-expanded photovoltaic pile

Abstract

The present application relates to offshore pile foundation technical field, specifically relates to a kind of expanding photovoltaic pile.One kind of expanding photovoltaic pile, it includes: pile body main body;Expanding assembly, expanding assembly includes outer pile body and arc extension section, outer pile body is fixedly arranged on the outer surface of pile body main body, the first side of arc extension section is connected with outer pile body, the second side of arc extension section extends in the direction away from pile body main body.Arc extension section can increase the contact area of pile body main body and soil, in turn improve the frictional resistance with silt layer, outer pile body and arc extension section can simultaneously improve the bearing capacity of photovoltaic pile, outer pile body is used to fix arc extension section and provide support to arc extension section, effectively solve the problem of silt layer foundation bearing capacity deficiency.

Description

Technical Field

[0001] This invention relates to the field of marine pile foundation technology, specifically to an expanded diameter photovoltaic pile. Background Technology

[0002] In offshore photovoltaic (PV) engineering construction, the pile foundation, as a key structure supporting the photovoltaic panels, directly affects the stability and safety of the entire power generation system. The marine environment is complex, especially the silty sand foundation, which suffers from low bearing capacity and poor liquefaction resistance. Traditional smooth cylindrical or prismatic PV piles have limited friction with the soil in silty sand layers, making the pile-soil interface prone to slippage failure, resulting in insufficient pull-out strength and vertical bearing capacity. Furthermore, under dynamic loads such as waves and tides at sea, the silty sand layer is highly susceptible to liquefaction and particle rearrangement, triggering pile foundation settlement and threatening the structural safety of the photovoltaic panels. Summary of the Invention

[0003] This invention provides an expanded diameter photovoltaic pile to solve the problem that the traditional column type has limited friction with the soil in silty sand layers, resulting in insufficient pile foundation pull-out resistance and vertical bearing capacity, which threatens the structural safety of photovoltaic panels.

[0004] This invention provides an expanded diameter photovoltaic pile, comprising: Main body of the pile; The diameter expansion assembly includes an outer pile body and an arc-shaped extension section. The outer pile body is fixedly disposed on the outer surface of the main pile body. A first side of the arc-shaped extension section is connected to the outer pile body, and a second side of the arc-shaped extension section extends away from the main pile body.

[0005] Beneficial effects: The arc-shaped extension section can increase the contact area between the main body of the pile and the soil, thereby increasing the frictional resistance with the silty sand layer. The outer pile body and the arc-shaped extension section can simultaneously improve the bearing capacity of the photovoltaic pile. The outer pile body is used to fix the arc-shaped extension section and provide support for the arc-shaped extension section, effectively solving the problem of insufficient bearing capacity of the silty sand foundation.

[0006] In one alternative embodiment, a composite anchoring structure is provided on the top surface of the second side of the arc-shaped extension, the composite anchoring structure including a plurality of barbed protrusions, and graded sand and pebbles are provided between the barbed protrusions to form an embedded layer.

[0007] Beneficial effects: The composite anchoring structure significantly enhances the pull-out resistance and bearing capacity of expanded-diameter photovoltaic piles in silty sand layers. Through the synergistic effect of barbed ridges and graded sand and gravel, mechanical locking of the pile-soil interface is achieved, effectively solving the slippage failure problem of traditional pile types under complex geological conditions. Simultaneously, the compaction effect of the embedded layer improves the overall stability of the silty sand layer and reduces the risk of liquefaction, providing a reliable pile foundation solution for offshore photovoltaic projects.

[0008] In one alternative embodiment, a plurality of the barbed protrusions are spirally distributed on the top surface of the second side of the arc-shaped extension, the barbed protrusions having an angle of 45° with the top surface of the arc-shaped extension, and the barbed protrusions and the graded sand and gravel can be fixed by natural compaction or low-pressure grouting during the pile driving process.

[0009] Beneficial effects: The spirally distributed barbed ridges create a continuous pull-out resistance system around the pile body, forming a composite anchoring structure. Compared to a straight arrangement, the spiral layout disperses stress concentration and avoids localized failure. Simultaneously, the 45° angle design balances pile penetration force and pull-out resistance, maximizing anchoring effectiveness while ensuring construction efficiency. The natural compaction process utilizes the impact energy during pile driving to rearrange sand and gravel particles, forming a dense embedded layer; low-pressure grouting further enhances the overall structural integrity by injecting cement-based grout to fill pores.

[0010] In one optional embodiment, the second side of the arc-shaped extension is fixedly connected to the outer pile body via a support assembly. The support assembly includes a support member and a bottom reinforcement member disposed between the second side of the arc-shaped extension and the outer pile body. The support member is fixedly connected to the second side of the arc-shaped extension and the outer pile body respectively, and the bottom reinforcement member is fixedly connected to the outer pile body and the support member respectively.

[0011] Beneficial effects: The support members bear the load transmitted by the arc-shaped extension, and the bottom reinforcement further enhances the connection strength between the support members and the outer pile body, ensuring the stability of the entire structure. The support components provide stable lateral support for the arc-shaped extension and prevent it from deforming in complex marine environments.

[0012] In one optional embodiment, the support member has an L-shaped cross-section and has a vertical section and a horizontal section. One end of the vertical section is fixedly connected to one end of the horizontal section, and the other end of the vertical section is fixedly connected to the bottom surface of the second side of the arc-shaped extension section. The other end of the horizontal section is fixedly connected to the outer pile body. The support member is provided with reinforcing diagonal bars connecting the vertical section and the horizontal section.

[0013] Beneficial effects: The L-shaped support effectively disperses stress when subjected to bending moments, preventing structural damage caused by localized stress concentration. Secondly, the reinforcing diagonal ribs not only enhance the overall strength of the support, ensuring its stability even under complex stress environments, but the reaction support formed by the bottom reinforcement further improves the structural stability, ensuring effective load dispersion on the curved extension. These structural elements work together to significantly reduce the deformation of the curved extension, increasing its ultimate bearing capacity and providing a strong guarantee for the long-term stable operation of the photovoltaic pile.

[0014] In one optional embodiment, a reinforcing vertical rib is provided between the bottom side reinforcement and the support member, and the reinforcing vertical rib is fixedly connected to the bottom side reinforcement and the horizontal section respectively.

[0015] Beneficial effects: The reinforced vertical ribs not only enhance the connection strength between the bottom reinforcement and the support, but also effectively disperse the horizontal load borne by the pile through the triangular stabilization system. When facing external forces such as wind and water flow in complex marine environments, they can maintain better stability and durability, further improve the overall rigidity of the structure, reduce the deformation caused by load, and provide a reliable guarantee for the long-term safe operation of photovoltaic piles.

[0016] In one optional embodiment, a plurality of inner support members are provided between the arc-shaped extension section and the main body of the pile, and the two ends of the inner support members are fixedly connected to the arc-shaped extension section and the main body of the pile, respectively.

[0017] Beneficial effects: When the pile is subjected to vertical loads, the inner support members and the outer support components form a coordinated support system that effectively disperses stress and reduces local deformation. Under horizontal loads, the inner support members enhance the torsional stiffness of the pile body and improve overall stability, significantly improving the adaptability and durability of the expanded diameter photovoltaic pile in complex marine environments and providing effective support for offshore photovoltaic panels.

[0018] In one alternative embodiment, the inner support member is provided with water-permeable holes.

[0019] Beneficial effects: The permeable holes of the inner support members work together with the embedment layer to drain water and suppress pile settlement.

[0020] In one optional embodiment, the outer pile body is fixedly connected to the pile body body by a fastening member, the fastening member including a plurality of spiral hoops, the spiral hoops being clamped on the outer surface of the outer pile body so that the outer pile body is tightly attached to the pile body body.

[0021] Beneficial effects: The spiral stirrups not only enhance the connection strength between the outer pile and the main pile body, but also effectively disperse the load borne by the pile through circumferential restraint, improving the overall structural stability. Simultaneously, the spiral stirrups ensure the reliability of the arc-shaped extension section under complex loads. In complex marine environments, this tightening method effectively resists pile vibration and deformation caused by external forces such as wind and water flow, ensuring the long-term stable operation of the photovoltaic pile.

[0022] In one optional embodiment, the arc-shaped extension includes a plurality of petal-shaped structures, which are arranged along the circumference of the outer pile body. The sides of adjacent petal-shaped structures connected to the outer pile body are interconnected, and the sides of adjacent petal-shaped structures away from the outer pile body are spaced apart from each other.

[0023] Beneficial effects: The petal-shaped structure not only increases the contact area between the pile body and the soil, but also further improves the pile's bearing capacity by distributing the load. The spacing between the petal-shaped structures allows for better filling and embedding of the silt layer, enhancing the friction at the pile-soil interface. During pile driving, the petal-shaped structure can compress the surrounding soil, forming a denser embedment layer, improving the pile's pull-out resistance and torsional stiffness, enabling it to better resist the torque generated by wind and water flow in complex marine environments. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a cross-sectional view of an expanded diameter photovoltaic pile according to an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of part A in the diagram; Figure 3 This is a top view of an expanded diameter photovoltaic pile according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures: 1. Main pile body; 2. Diameter expansion component; 201. Outer pile body; 202. Arc-shaped extension section; 2021. Petal-shaped structure; 3. Composite anchoring structure; 301. Barbed protrusion; 302. Embedding layer; 4. Support component; 401. Support member; 402. Bottom side reinforcement member; 5. Reinforcing diagonal bar; 6. Reinforcing vertical bar; 7. Inner support member; 701. Water-permeable hole; 8. Hoop; 801. Spiral hoop. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The following is combined with Figures 1 to 3 The following describes embodiments of the present invention.

[0029] According to an embodiment of the present invention, an expanded diameter photovoltaic pile is provided, comprising: a pile body 1 and an expanded diameter assembly 2. The expanded diameter assembly 2 includes an outer pile body 201 and an arc-shaped extension section 202. The outer pile body 201 is fixedly disposed on the outer surface of the pile body 1. A first side of the arc-shaped extension section 202 is connected to the outer pile body 201, and a second side of the arc-shaped extension section 202 extends away from the pile body 1.

[0030] Specifically, the cross-section of the main pile body 1 is hexagonal. Compared to traditional circular piles, the hexagonal structure has better torsional resistance and can effectively resist the torque generated by complex ocean currents and wind forces. The outer pile body 201 is fixedly installed on the outer surface of the main pile body 1. Figure 1 In the middle, the side where the arc-shaped extension section 202 is connected to the outer pile body 201 is the first side, and the side of the arc-shaped extension section 202 away from the first side is the second side. The arc-shaped extension section 202 is located in the middle of the pile body 1. The arc-shaped extension section can avoid stress concentration. After the pile body 1 is installed, the arc-shaped extension section 202 is located in the silt layer.

[0031] In other alternative embodiments, the cross-section of the pile body 1 may be a regular pentagon or other polygonal structure.

[0032] The arc-shaped extension section 202 can increase the contact area between the main body of the pile 1 and the soil, thereby increasing the frictional resistance with the silty sand layer. The outer pile body 201 and the arc-shaped extension section 202 can simultaneously improve the bearing capacity of the photovoltaic pile. The outer pile body 201 is used to fix the arc-shaped extension section 202 and provide support for the arc-shaped extension section 202, effectively solving the problem of insufficient bearing capacity of the silty sand foundation.

[0033] In one embodiment, a composite anchoring structure 3 is provided on the top surface of the second side of the arc-shaped extension 202. The composite anchoring structure 3 includes a plurality of barbed protrusions 301, and graded sand and pebbles are provided between the barbed protrusions 301 to form an embedded layer 302.

[0034] Specifically, such as Figure 1 and Figure 2As shown, when the composite anchoring structure 3 is located within the silty sand layer and bears a vertical load, the sand and gravel, under the constraint of the barbed protrusions 301, interlock with the silty sand layer, forming multiple "micro-anchor piles," significantly increasing the shear resistance at the pile-soil interface. When the pile is pulled out, the sand and gravel generate a downward wedging force under the action of the barbed protrusions 301, similar to the principle of "expansion bolts," preventing the pile from being pulled up. The irregular particle size of the graded sand and gravel further enhances the interlocking force between particles, avoiding the "slippage failure" that is prone to occur in traditional smooth pile surfaces in silty sand layers. The barbed protrusions 301 and the graded sand and gravel can be fixed by natural compaction or low-pressure grouting during the pile driving process. This structure transforms the silty sand layer from a traditional "weakly supported medium" into a "cooperative bearing structure." The embedded layer 302 improves the density of the silty sand through compaction, accelerates the dissipation of pore water pressure, reduces the risk of liquefaction, and enhances the stability of the pile foundation in saturated silty sand. Preferably, the particle size of the graded sand and gravel is 5-20mm. The number of barbed ridges 301 can be determined according to the design requirements of the photovoltaic pile, and is not limited here.

[0035] The composite anchoring structure 3 significantly enhances the pull-out resistance and bearing capacity of the expanded-diameter photovoltaic piles in silty sand layers. Through the synergistic effect of the barbed ridges 301 and the graded sand and gravel, mechanical locking of the pile-soil interface is achieved, effectively solving the slippage failure problem of traditional pile types under complex geological conditions. At the same time, the compaction effect of the embedded layer 302 improves the overall stability of the silty sand layer and reduces the risk of liquefaction, providing a reliable pile foundation solution for offshore photovoltaic projects.

[0036] In one embodiment, a plurality of barbed protrusions 301 are spirally distributed on the top surface of the second side of the arc-shaped extension 202, and the barbed protrusions 301 and the top surface of the arc-shaped extension 202 have an angle of 45°. The barbed protrusions 301 and the graded sand and gravel can be fixed by natural compaction or low-pressure grouting during the pile driving process.

[0037] Specifically, such as Figure 1 and Figure 2 As shown, the 45° angle of the barbed ridges, combined with the graded sand and gravel, generates a downward wedging force, preventing the pile from being pulled up. Preferably, the height of the barbed ridges 301 is 30mm, and the spacing between adjacent barbed ridges 301 is 80mm, so that several barbed ridges 301 form a regular mechanical restraint array. During the pile driving process, the barbed ridges 301 forcibly compress the silt layer, and the sand and gravel form "micro-anchor piles" under the constraint of the ridges. Each barbed ridge unit 301 can provide 8-12kN of pull-out resistance. The mechanical restraint of the barbed ridges 301 and the frictional interlocking of the sand and gravel form a double anchoring. The barbed ridges 301 prevent radial displacement of the sand and gravel, and the sand and gravel transfer the load to the silt layer through the inter-particle interlocking force. The two work together to increase the shear strength of the pile-soil interface by 47%.

[0038] The spirally distributed barbed ridges 301 create a continuous pull-out resistance system around the pile body in the composite anchoring structure 3. Compared to a straight arrangement, the spiral layout disperses stress concentration and avoids localized failure. Simultaneously, the 45° angle design balances pile penetration force and pull-out resistance, maximizing anchoring effectiveness while ensuring construction efficiency. The natural compaction process utilizes the impact energy during pile driving to rearrange sand and gravel particles, forming a dense embedded layer 302; low-pressure grouting further enhances the overall structural integrity by injecting cement-based grout to fill pores.

[0039] In one embodiment, the second side of the arc-shaped extension 202 is fixedly connected to the outer pile 201 via a support assembly 4. The support assembly 4 includes a support member 401 and a bottom reinforcement member 402 disposed between the second side of the arc-shaped extension 202 and the outer pile 201. The support member 401 is fixedly connected to the second side of the arc-shaped extension 202 and the outer pile 201 respectively, and the bottom reinforcement member 402 is fixedly connected to the outer pile 201 and the support member 401 respectively.

[0040] Specifically, such as Figure 1 As shown, support component 4 provides stable lateral support for the arc-shaped extension 202, preventing deformation in complex marine environments. Support member 401 is made of high-strength steel, possessing sufficient rigidity and strength to withstand the loads transmitted by the arc-shaped extension 202. Bottom reinforcement member 402 further enhances the connection strength between support member 401 and the outer pile body 201, ensuring the stability of the entire structure.

[0041] In one embodiment, the cross-section of the support member 401 is L-shaped. The support member 401 has a vertical section and a horizontal section. One end of the vertical section is fixedly connected to one end of the horizontal section, and the other end of the vertical section is fixedly connected to the bottom surface of the second side of the arc-shaped extension section 202. The other end of the horizontal section is fixedly connected to the outer pile body 201. A reinforcing diagonal bar 5 connecting the vertical section and the horizontal section is provided inside the support member 401.

[0042] Specifically, such as Figure 1 As shown, the vertical and horizontal sections of the support member 401 are integrally formed. The upper end of the vertical section is welded and fixed to the bottom of the second side of the arc-shaped extension section 202, the lower end of the vertical section is fixedly connected to the left end of the horizontal section, and the right end of the horizontal section is connected to the outer pile body 201 through pre-embedded steel plate bolts. The two ends of the reinforcing diagonal rib 5 are respectively connected to the middle of the vertical and horizontal sections by through-hole plug welding, thereby strengthening the strength of the vertical and horizontal sections. The angle between the reinforcing diagonal rib 5 and the vertical and horizontal sections is 45°. The L-shaped support member 401 bears the bending moment, the reinforcing diagonal rib 5 resists the tensile force, and the bottom reinforcing member 402 forms a reaction force support. The three work together to distribute the load of the arc-shaped extension section 202 to the pile body 1, thereby effectively reducing the deformation of the arc-shaped extension section 202 and improving the ultimate bearing capacity of the arc-shaped extension section 202.

[0043] The L-shaped support 401 effectively disperses stress when subjected to bending moments, preventing structural damage caused by localized stress concentration. Secondly, the reinforcing diagonal ribs 5 not only enhance the overall strength of the support 401, but their 45° angle also optimizes tensile resistance, ensuring stability even under complex stress conditions. The reaction support formed by the bottom reinforcing member 402 further improves the structural stability, ensuring effective load dispersion on the arc-shaped extension 202. These structural elements work together to significantly reduce the deformation of the arc-shaped extension 202, increasing its ultimate bearing capacity and providing strong support for the long-term stable operation of the photovoltaic pile.

[0044] In one embodiment, a reinforcing rib 6 is provided between the bottom side reinforcement 402 and the support member 401, and the reinforcing rib 6 is fixedly connected to the bottom side reinforcement 402 and the horizontal section respectively.

[0045] Specifically, such as Figure 1 As shown, the bottom reinforcing member 402 is welded and fixed to the bottom of the horizontal section, with an angle of 45° between the bottom reinforcing member 402 and the horizontal section. The two ends of the reinforcing vertical rib 6 are welded and fixed to the bottom reinforcing member 402 and the middle of the horizontal section, respectively. The upper end of the reinforcing vertical rib 6 is opposite to the lower end of the reinforcing diagonal rib 5. The reinforcing vertical rib 6, the bottom reinforcing member 402, and the horizontal section form a triangular stable system. The reinforcing vertical rib 6, the bottom reinforcing member 402, and the support member 401 form a rigid node. When the pile body bears a horizontal load, the reinforcing vertical rib 6 transmits the pressure of the bottom reinforcing member 402 to the main pile body 1, avoiding stress concentration.

[0046] The reinforcing vertical rib 6 not only enhances the connection strength between the bottom reinforcing member 402 and the supporting member 401, but also effectively disperses the horizontal load borne by the pile through the triangular stabilization system. When facing external forces such as wind and water flow in complex marine environments, it can maintain better stability and durability, further improve the overall rigidity of the structure, reduce the deformation caused by load, and provide a reliable guarantee for the long-term safe operation of photovoltaic piles.

[0047] In one embodiment, a plurality of inner support members 7 are provided between the arc-shaped extension section 202 and the pile body 1, and the two ends of the inner support members 7 are fixedly connected to the arc-shaped extension section 202 and the pile body 1, respectively.

[0048] Specifically, such as Figure 1As shown, inner support members 7 are spaced apart circumferentially along the main pile body 1. The main pile body 1 has a hexagonal cross-section, with one inner support member 7 on each face. The two ends of the inner support members 7 are welded and fixed to the side of the main pile body 1 and the arc-shaped extension section 202, respectively, or can be connected using pre-embedded steel plate bolts. Preferably, the inner support member 7 has a diameter of 80mm and is prestressed and tensioned to the arc-shaped extension section 202 with a prestressing force of 50kN. The inner support members 7 provide support for the arc-shaped extension section 202 from within the pile body, further enhancing the structural strength of the connection between the arc-shaped extension section 202 and the main pile body 1. The inner support members 7 can be made of high-strength alloy steel, possessing sufficient rigidity and fatigue resistance to withstand the complex loads transmitted by the arc-shaped extension section 202.

[0049] When the pile is subjected to vertical loads, the inner support member 7 and the outer support component 4 form a coordinated support system that effectively disperses stress and reduces local deformation. Under horizontal loads, the inner support member 7 enhances the torsional stiffness of the main body 1 of the pile, improves the overall stability, and significantly improves the adaptability and durability of the expanded diameter photovoltaic pile in complex marine environments, providing effective support for offshore photovoltaic panels.

[0050] In one embodiment, the inner support member 7 has a water-permeable hole 701.

[0051] Specifically, such as Figure 1 As shown, the permeable holes 701 can accelerate the dissipation of excess pore water pressure in the silty sand layer around the pile. Especially under dynamic loads such as tides and waves at sea, it can reduce the strength loss of the soil caused by the increase in pore water pressure and improve the liquefaction resistance of the pile foundation in saturated silty sand. Preferably, the permeable holes 701 have a diameter of 20 mm and are distributed in a quincunx pattern with an adjacent hole spacing of 100 mm. Under wave loads, pore water is quickly discharged through the permeable holes 701, shortening the dissipation time of excess pore water pressure around the pile by 60%.

[0052] The permeable holes 701 of the inner support member 7 work together with the embedded layer 302 to drain water and suppress pile settlement. The plum blossom-shaped distribution of the permeable holes 701 not only increases the drainage area, but also avoids stress concentration that may be caused by the straight arrangement, further improving the stability of the structure.

[0053] In one embodiment, the outer pile body 201 is fixedly connected to the pile body 1 by a fastening member 8. The fastening member 8 includes a plurality of spiral hoops 801, which are clamped on the outer side of the outer pile body 201 so that the outer pile body 201 is tightly attached to the pile body 1.

[0054] Specifically, such as Figure 1As shown, the spiral stirrups 801 are attached to the outer side of the outer pile body 201. By applying a circumferential restraint force, the outer pile body 201 is tightly fitted to the pile body 1, preventing relative displacement between the two during the stress process. Several spiral stirrups 801 are arranged parallel to each other and located below the support component 4. This ensures effective restraint on the outer pile body 201 without affecting the normal operation of the support component 4.

[0055] The spiral stirrups 801 not only enhance the connection strength between the outer pile body 201 and the main pile body 1, but also effectively disperse the load borne by the pile body through circumferential restraint, improving the overall structural stability. Simultaneously, the spiral stirrups 801 ensure the reliability of the arc-shaped extension section 202 under complex loads. In complex marine environments, this tightening method can effectively resist pile vibration and deformation caused by external forces such as wind and water flow, ensuring the long-term stable operation of the photovoltaic pile.

[0056] Preferably, the clamping member 8 consists of three layers of Φ12mm spiral stirrups 801 with a pitch of 200mm, which are welded to the expanded diameter outer pile body 201. The circumferential restraint force generated by the spiral stirrups 801 controls the gap between the outer pile body 201 and the pile body 1 to within 2mm, forming an integral load-bearing structure. Finite element analysis shows that after setting the spiral stirrups 801, the radial deformation of the composite pile body is reduced by 62%, and the uniformity of the interface shear stress distribution is improved by 39%.

[0057] In one embodiment, the arc-shaped extension 202 includes a plurality of petal-shaped structures 2021, which are arranged along the circumferential surface of the outer pile body 201. The sides of adjacent petal-shaped structures 2021 connected to the outer pile body 201 are connected to each other, and the sides of adjacent petal-shaped structures 2021 away from the outer pile body 201 are spaced apart from each other.

[0058] Specifically, such as Figure 3 As shown, the arc-shaped extension section 202 includes six petal-shaped structures 2021. Each petal-shaped structure 2021 corresponds to one side of the pile body 1. The root of the petal-shaped structure 2021 is fixedly connected to the outer pile body 201, and the roots of adjacent petal-shaped structures 2021 are interconnected. The six petal-shaped structures 2021 are spaced apart from the outer pile body 201, forming six independent arc-shaped extension areas. Each petal-shaped structure 2021 corresponds to an inner support member 7, and the petal-shaped structure 2021 is fixedly connected to the pile body 1 through the inner support member 7.

[0059] The petal-shaped structure 2021 not only increases the contact area between the pile body 1 and the soil, but also further improves the bearing capacity of the pile by distributing the load. The spacing between the petal-shaped structures 2021 allows the silt layer to be better filled and embedded, enhancing the friction at the pile-soil interface. During pile driving, the petal-shaped structure 2021 can compress the surrounding soil, forming a denser embedded layer 302, improving the pull-out resistance of the pile foundation and also increasing its torsional stiffness, enabling it to better resist the torque generated by wind and water flow in complex marine environments.

[0060] The number and size of the petal-shaped structure 2021 can be adjusted according to actual engineering needs to adapt to different geological conditions and load requirements. By optimizing the geometric parameters of the petal-shaped structure 2021, such as arc length, width, and thickness, the bearing capacity and construction convenience of the pile foundation can be further balanced.

[0061] The working principle of this invention is as follows: Under vertical loads (such as the self-weight of photovoltaic panels and wind loads), the petal-shaped arc-shaped extension 202 increases the contact area between the pile and the silt layer. Simultaneously, the embedded layer 302 formed by the barbed protrusions 301 and the graded sand and gravel plays a crucial role. The mechanical restraint of the barbed protrusions 301 and the frictional interlocking between the graded sand and gravel particles form a composite anchor. Under the constraint of the barbed protrusions 301, the sand and gravel interlock with the silt layer, effectively forming multiple "micro-anchors" around the pile. This significantly increases the shear resistance at the pile-soil interface, thereby enhancing the vertical bearing capacity of the pile foundation. When the pile is subjected to upward pull-out force, the 45° inclination of the barbed protrusions 301 causes the sand and gravel to generate a downward wedging force, similar to the principle of an expansion bolt. The embedded layer 302 prevents the pile from being pulled up and enhances its pull-out resistance. Under dynamic loads (such as waves and tides), the embedded layer 302 increases the relative density of the silt layer through compaction, reducing its risk of liquefaction. The pores of the graded sand and gravel form natural drainage channels, accelerating the dissipation of excess pore water pressure and reducing the strength reduction of the soil caused by the increase of pore water pressure. At the same time, the stress diffusion effect of the embedded layer 302 transfers the pile load to a larger area of ​​soil, reducing local stress concentration. The permeable holes 701 of the inner support member 7 further assist in drainage and inhibit pile settlement. In addition, the rough surface formed by the combination of the barbed ridges 301 and the sand and gravel reduces the water flow velocity around the pile, reduces the risk of silt particles being washed away, and ensures the long-term stability of the pile foundation.

[0062] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An expanded diameter photovoltaic pile, characterized in that, include: Main body of the pile (1); The diameter expansion assembly (2) includes an outer pile body (201) and an arc-shaped extension section (202). The outer pile body (201) is fixedly disposed on the outer surface of the pile body (1). The first side of the arc-shaped extension section (202) is connected to the outer pile body (201), and the second side of the arc-shaped extension section (202) extends away from the pile body (1).

2. The expanded diameter photovoltaic pile according to claim 1, characterized in that, The top surface of the second side of the arc-shaped extension section (202) is provided with a composite anchoring structure (3), the composite anchoring structure (3) includes a plurality of barbed protrusions (301), and graded sand and pebbles are provided between the barbed protrusions (301) to form an embedded layer (302).

3. The expanded diameter photovoltaic pile according to claim 2, characterized in that, Several of the barbed protrusions (301) are spirally distributed on the top surface of the second side of the arc-shaped extension section (202). The barbed protrusions (301) have an angle of 45° with the top surface of the arc-shaped extension section (202). The barbed protrusions (301) and the graded sand and gravel can be fixed by natural compaction or low-pressure grouting during the pile driving process.

4. The expanded diameter photovoltaic pile according to any one of claims 1 to 3, characterized in that, The second side of the arc-shaped extension (202) is fixedly connected to the outer pile (201) via a support assembly (4). The support assembly (4) includes a support member (401) and a bottom reinforcement member (402) disposed between the second side of the arc-shaped extension (202) and the outer pile (201). The support member (401) is fixedly connected to the second side of the arc-shaped extension (202) and the outer pile (201) respectively, and the bottom reinforcement member (402) is fixedly connected to the outer pile (201) and the support member (401) respectively.

5. The expanded diameter photovoltaic pile according to claim 4, characterized in that, The cross-section of the support member (401) is L-shaped. The support member (401) has a vertical section and a horizontal section. One end of the vertical section is fixedly connected to one end of the horizontal section. The other end of the vertical section is fixedly connected to the bottom surface of the second side of the arc-shaped extension section (202). The other end of the horizontal section is fixedly connected to the outer pile body (201). The support member (401) is provided with reinforcing diagonal bars (5) that connect the vertical section and the horizontal section.

6. The expanded diameter photovoltaic pile according to claim 5, characterized in that, A reinforcing rib (6) is provided between the bottom side reinforcement (402) and the support (401), and the reinforcing rib (6) is fixedly connected to the bottom side reinforcement (402) and the horizontal section respectively.

7. The expanded diameter photovoltaic pile according to claim 1, characterized in that, Multiple inner support members (7) are provided between the arc-shaped extension section (202) and the pile body (1), and the two ends of the inner support members (7) are fixedly connected to the arc-shaped extension section (202) and the pile body (1) respectively.

8. The expanded diameter photovoltaic pile according to claim 7, characterized in that, The inner support member (7) has a water-permeable hole (701).

9. The expanded diameter photovoltaic pile according to claim 1, characterized in that, The outer pile body (201) is fixedly connected to the pile body (1) by a fastening member (8). The fastening member (8) includes a plurality of spiral stirrups (801). The spiral stirrups (801) are clamped on the outer side of the outer pile body (201) so that the outer pile body (201) is tightly attached to the pile body (1).

10. The expanded diameter photovoltaic pile according to claim 1, characterized in that, The arc-shaped extension section (202) includes a plurality of petal-shaped structures (2021), which are arranged along the circumference of the outer pile body (201). The sides of adjacent petal-shaped structures (2021) connected to the outer pile body (201) are connected to each other, and the sides of adjacent petal-shaped structures (2021) away from the outer pile body (201) are spaced apart from each other.

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