Offshore photovoltaic combined pile and construction method thereof

Abstract

The offshore photovoltaic combined pile and the construction method thereof are provided, which comprise coaxially arranged upper and lower pile sections, the upper and lower pile sections are connected, the diameter of the upper pile section is smaller than that of the lower pile section, and an interface structure for positioning and cooperation with a piling auxiliary tool is formed between the upper and lower pile sections; the lower pile section comprises a high-strength prestressed concrete pipe pile for implanting into a seabed to provide a bearing foundation; and the upper pile section comprises a steel pipe pile extending above the water surface for connecting a photovoltaic component. The present application adopts the design of two upper and lower sections to effectively reduce the project construction cost under the premise of ensuring the safety of the overall structure, aiming at the problem that a single pile type cannot balance the structural safety and the project construction economy.

Description

Technical Field

[0001] This invention relates to the field of marine photovoltaic pile foundation engineering technology, specifically to a nearshore photovoltaic composite pile and its construction method, which is particularly suitable for marine environments with soft foundations and significant wave action. Background Technology

[0002] my country continues to advance its goals of "carbon peaking" and "carbon neutrality," but land resources are becoming increasingly scarce. Due to their vast space and good sunlight conditions, offshore photovoltaics is gradually becoming an emerging development direction in the photovoltaic field.

[0003] However, the geological conditions in nearshore areas are complex, with deep silt foundations and extremely low bearing capacity. To meet the requirements of load-bearing and deformation coordination for the upper photovoltaic array, the pile diameter and wall thickness of the foundation are often large. Furthermore, the seawater salinity reaches 28-32‰, and the chloride ion concentration exceeds 18000 mg / L, placing the foundation structure in a highly corrosive environment for extended periods, requiring the pile materials to possess high corrosion resistance. Using a single foundation type presents the following problems: the construction and corrosion protection costs of large-diameter steel pipe piles are high; large-diameter concrete pipe piles bear large bending moments caused by wave current loads, but their bending resistance is weak. Combining the advantages of large-diameter concrete piles (low cost and large vertical and horizontal bearing capacity) with small-diameter steel pipe piles (smaller bending moments and lower horizontal forces caused by wave current loads) would be of great benefit to the sustainable development of the nearshore photovoltaic economy. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a near-shore photovoltaic composite pile. This invention addresses the problem that a single pile type cannot balance structural safety and project construction economy by employing two segmented designs (upper and lower sections), effectively reducing project construction costs while ensuring overall structural safety.

[0005] In a first aspect, the present invention provides an offshore photovoltaic composite pile, comprising an upper pile segment and a lower pile segment coaxially arranged, the upper pile segment and the lower pile segment being connected, the diameter of the upper pile segment being smaller than the diameter of the lower pile segment, and the upper pile segment and the lower pile segment being fitted together to form an interface structure for positioning and cooperating with piling auxiliary tools; the lower pile segment comprises a high-strength prestressed concrete pipe pile for implanting into the seabed to provide a load-bearing foundation; the upper pile segment comprises a steel pipe pile extending above the water surface for connecting photovoltaic modules.

[0006] As a preferred embodiment of the present invention: the upper pile segment includes a steel pipe pile and a connecting steel plate connected to the bottom of the steel pipe pile; the lower pile segment includes a high-strength prestressed concrete pipe pile and an end plate connected to the top of the high-strength prestressed concrete pipe pile; the connecting steel plate is mechanically connected to the end plate; and the outer edge of the top surface of the connecting steel plate, the side surface of the end plate, and the upper side surface of the high-strength prestressed concrete pipe pile cooperate to form an interface structure that is positioned and cooperates with the pile driving auxiliary tooling.

[0007] As a preferred embodiment of the present invention: both the connecting steel plate and the end plate are circular, and the diameters of the connecting steel plate and the end plate are the same as those of the high-strength prestressed concrete pipe pile. The connecting steel plate, the steel pipe pile, the end plate, and the high-strength prestressed concrete pipe pile are coaxially arranged.

[0008] As a preferred technical solution of the present invention: the connecting steel plate and the end plate are connected by a plurality of high-strength bolts, the plurality of high-strength bolts being circumferentially located on the inner edge of the top surface of the connecting steel plate, the inner edge being located on the inner side of the outer edge and the outer side of the steel pipe pile.

[0009] As a preferred embodiment of the present invention: multiple stiffening plates are connected between the side of the steel pipe pile and the top surface of the connecting steel plate, and the multiple stiffening plates are arranged at intervals around the outer periphery of the steel pipe pile.

[0010] Secondly, a second objective of this invention is to provide a construction method for offshore photovoltaic composite piles, wherein the various components of the aforementioned offshore photovoltaic composite piles are prefabricated, and the construction method includes the following steps:

[0011] S1. After transporting each prefabricated component of the nearshore photovoltaic composite pile to the construction sea area, the high-strength prestressed concrete pipe pile of the lower pile section is sunk into the seabed to the preset depth at the preset pile position, and the top of the pipe pile is made to be above the water surface.

[0012] S2. Connect the connecting steel plate of the upper pile segment to the end plate with high-strength bolts to form a composite pile;

[0013] S3. Lifting the pile driving auxiliary tool, placing the pile driving auxiliary tool on the outside of the combined pile, and matching the lower connecting part of the pile driving auxiliary tool with the interface structure so that the steel pipe pile is placed in the cavity of the pile driving auxiliary tool.

[0014] S4. Continue driving piles, treating the pile driving auxiliary tool and the combined pile as one unit, and hammer the pile driving working surface on the top surface of the pile driving auxiliary tool to continue driving the pile to the design depth.

[0015] S5: Remove the pile driving auxiliary tooling.

[0016] As a preferred technical solution of the present invention: in step S3, the connecting part includes a first connecting part and a second connecting part, the first connecting part is connected to the outer edge, and the second connecting part is connected to the side of the end plate and the upper side of the high-strength prestressed concrete pipe pile.

[0017] As a preferred technical solution of the present invention: the piling auxiliary tooling includes a sleeve, the sleeve having a cavity for accommodating steel pipe piles; the lower part of the sleeve is provided with a connection part that cooperates with the interface structure, the top end face of the sleeve forms a piling working surface, and the outer side wall of the sleeve is provided with lifting lugs for lifting operations.

[0018] As a preferred technical solution of the present invention: the outer wall of the sleeve is provided with scale lines, and in step S4, the pile driving depth is controlled by observing the scale lines on the outer wall of the sleeve.

[0019] The beneficial effects provided by this invention are as follows:

[0020] 1. This invention reduces project construction costs. The composite pile adopts a structure of upper steel and lower concrete, which makes full use of the material advantages of concrete and steel respectively, and achieves structural function with the optimal material combination. Compared with the all-steel pipe pile scheme, it can significantly reduce raw material and anti-corrosion costs. Compared with the all-concrete pipe pile scheme, it can significantly reduce material usage and wave load on the structure.

[0021] 2. Reduce project construction and operation and maintenance costs. The mechanical connection between the upper and lower pile sections is made by bolts, which reduces the time spent at sea and the reliance on special operation equipment, improves overall construction efficiency, and reduces installation costs.

[0022] 3. The structure of this invention is safe and reliable. The lower concrete pipe piles provide strong vertical bearing capacity and horizontal resistance; the upper steel pipe piles provide bending stiffness while reducing wave and current forces under the combined action of wind, waves, and currents, thus ensuring the overall stability and deformation control of the foundation under the combined action of wind, waves, and currents. Furthermore, the bolted connection nodes can be prefabricated in the factory, ensuring controllable quality and clear mechanical properties, avoiding defects that may occur during on-site welding, and improving the reliability of the node connections.

[0023] 4. This invention offers convenient and efficient construction, aligning with green construction principles. The use of bolted mechanical connections avoids the technically demanding and environmentally sensitive offshore welding operations, simplifying the construction process and clarifying quality control points. The specialized piling auxiliary equipment used in the construction method ensures pile protection and depth control during the pile driving process, improving overall construction quality. The reusability of the piling auxiliary equipment conforms to green construction principles, reducing resource consumption and engineering waste. Attached Figure Description

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

[0025] Figure 1 This is a three-dimensional structural diagram of a near-shore photovoltaic composite pile provided in an embodiment of the present invention;

[0026] Figure 2 An elevation view of a near-shore photovoltaic composite pile provided in an embodiment of the present invention;

[0027] Figure 3 A top view of a high-strength prestressed concrete pipe pile provided in an embodiment of the present invention;

[0028] Figure 4 This is a top view of an offshore photovoltaic composite pile provided in an embodiment of the present invention;

[0029] Figure 5 An elevation view of the piling auxiliary tooling provided in an embodiment of the present invention;

[0030] Figure 6 This is an elevation view of the nearshore photovoltaic composite pile driving process provided in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the piling auxiliary tooling and the positioning state of the near-shore photovoltaic combined pile provided in an embodiment of the present invention;

[0032] Figure 8 This is an elevation view of the completed marine photovoltaic combined pile driving according to an embodiment of the present invention.

[0033] Reference numerals in the attached drawings: 1-steel pipe pile, 2-stiffening plate, 3-steel plate, 31-first bolt hole, 4-high-strength bolt, 5-end plate, 51-second bolt hole, 6-high-strength prestressed concrete pipe pile, 7-pile driving auxiliary tooling, 71-sleeve, 711-pile driving working surface, 72-connection part, 721-first connection part, 722-second connection part, 8-lifting lug, 9-scale line. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0036] like Figures 1 to 4 As shown, a near-shore photovoltaic composite pile includes an upper pile segment and a lower pile segment arranged coaxially. The coaxial arrangement ensures axial load bearing and prevents eccentric loads. The upper pile segment and the lower pile segment are connected, and the diameter of the upper pile segment is smaller than the diameter of the lower pile segment. The upper pile segment and the lower pile segment are fitted together to form an interface structure for positioning and engaging with a piling auxiliary tool 7. The lower pile segment includes a high-strength prestressed concrete pipe pile 6 for implantation into the seabed to provide a load-bearing foundation. The upper pile segment includes a steel pipe pile 1 extending above the water surface for connecting photovoltaic modules.

[0037] In the nearshore waters, where there is a thick layer of silty soil, large-diameter high-strength prestressed concrete pipe piles 6 are used to resist the vertical and horizontal loads transmitted from the upper part of the photovoltaic support structure. Above the mud surface, to reduce the influence of wave and current loads, small-diameter steel pipe piles 1 are selected, and steel pipes of the same diameter have stronger bending and shear resistance than concrete piles.

[0038] The upper pile segment includes a steel pipe pile 1 and a connecting steel plate 3 connected to the bottom of the steel pipe pile 1. The lower pile segment includes a high-strength prestressed concrete pipe pile 6 and an end plate 5 connected to the top of the high-strength prestressed concrete pipe pile 6. The connecting steel plate 3 is mechanically connected to the end plate 5, and the outer edge of the top surface of the connecting steel plate 3, the side surface of the end plate 5, and the upper side surface of the high-strength prestressed concrete pipe pile 6 cooperate to form an interface structure that is positioned and cooperates with the pile driving auxiliary tooling 7.

[0039] In this embodiment, the upper steel pipe pile 1 and the lower high-strength prestressed concrete pipe pile 6 are selected with appropriate anti-corrosion methods to adapt to different environmental conditions. The steel pipe pile 1 in seawater is coated with a heavy anti-corrosion coating, while the high-strength prestressed concrete pipe pile 6 under the mud surface is coated with anti-corrosion paint and an anti-seepage agent is added. Both structures have good corrosion resistance and durability, reducing the later maintenance costs.

[0040] Both the connecting steel plate 3 and the end plate 5 are circular, and the diameters of the connecting steel plate 3 and the end plate 5 are the same as those of the high-strength prestressed concrete pipe pile 6. The connecting steel plate 3, the steel pipe pile 1, the end plate 5, and the high-strength prestressed concrete pipe pile 6 are coaxially arranged.

[0041] The connecting steel plate 3 and the end plate 5 are connected by a plurality of high-strength bolts 4. The plurality of high-strength bolts 4 are arranged circumferentially on the inner edge of the top surface of the connecting steel plate 3, and the inner edge is located on the inner side of the outer edge and the outer side of the steel pipe pile 1.

[0042] In this embodiment, the connecting steel plate is provided with a plurality of first bolt holes 31, and the end plate is provided with a plurality of second bolt holes 51. The number and center position of the first bolt holes 31 on the steel plate 3 are consistent with the second bolt holes 51 on the end plate 5, ensuring that the upper pile segment and the lower pile segment can be mechanically connected by a plurality of high-strength bolts 4.

[0043] This invention uses bolted connections to replace traditional offshore welding, enabling rapid and reliable assembly of the upper steel pipe pile 1 and the lower high-strength prestressed concrete pipe pile 6 in the construction sea area. This avoids the quality risks, reliance on complex working conditions, and damage to the anti-corrosion layer caused by welding, greatly simplifies the offshore construction process, reduces construction risks, and improves construction efficiency.

[0044] Multiple stiffening plates 2 are connected between the side of the steel pipe pile 1 and the top surface of the connecting steel plate 3, and the multiple stiffening plates 2 are arranged at intervals around the outer periphery of the steel pipe pile 1.

[0045] like Figures 6-8 As shown, the present invention also provides a construction method for offshore photovoltaic composite piles, wherein the various components of the offshore photovoltaic composite piles described above are prefabricated, and the construction method includes the following steps:

[0046] S1. After transporting each prefabricated component of the nearshore photovoltaic composite pile to the construction sea area, the high-strength prestressed concrete pipe pile 6 of the lower pile section is sunk into the seabed to the preset depth at the preset pile position, and the top of the pipe pile is made to be above the water surface.

[0047] S2. Connect the connecting steel plate 3 of the upper pile segment to the end plate 5 using high-strength bolts 4 to form a combined pile;

[0048] S3. Lifting the pile driving auxiliary tool 7, placing the pile driving auxiliary tool 7 on the outside of the combined pile, and cooperating the lower connecting part 72 of the pile driving auxiliary tool 7 with the interface structure so that the steel pipe pile 1 is placed in the cavity of the pile driving auxiliary tool 7.

[0049] Among them, such as Figure 5As shown, the piling auxiliary tool 7 includes a sleeve 71, which has a cavity for accommodating the steel pipe pile 1; the lower part of the sleeve 71 is provided with a connection part 72 that cooperates with the interface structure, the top end face of which forms a piling operation surface 711, and the outer side wall of which is provided with a lifting lug 8 for lifting operation, for lifting, installation and recycling of the piling auxiliary tool 77.

[0050] In step S3, the connecting part 72 includes a first connecting part 721 and a second connecting part 722. The first connecting part 721 is connected to the outer edge, and the second connecting part 722 is connected to the side of the end plate 5 and the upper side of the high-strength prestressed concrete pipe pile 6.

[0051] The first connecting part 721 is configured as an annular steel plate, the inner diameter of which is the same as the bottom diameter of the sleeve 71, and the outer diameter is the same as the diameter of the high-strength prestressed concrete pipe pile 6. The second connecting part 722 is a steel pipe, and the first connecting part 721 and the second connecting part 722 cooperate to form a stepped structure to achieve the guiding and positioning of the composite pile during the pile driving process.

[0052] S4. Continue driving piles, treating the pile driving auxiliary tool 7 and the combined pile as one unit, and hammer the pile driving working surface 711 on the top surface of the pile driving auxiliary tool 7 to continue driving the pile to the design depth.

[0053] The sleeve 71 has a scale line 9 on its outer side wall. In step S4, the pile driving depth is controlled by observing the scale line 9 on the outer side wall of the sleeve 71, thereby ensuring that the combined pile is successfully constructed to the designed depth.

[0054] S5: Remove the pile driving auxiliary tool 7.

[0055] The construction method of the near-shore photovoltaic composite pile of this invention uses a reusable piling auxiliary tool 77 to achieve the piling and positioning of the composite pile. This tool serves as both a carrier for transmitting piling force and allows for intuitive control of the piling depth through the side wall scale lines 910. Its "insertion-type" design enables rapid connection and separation with the composite pile, and it can be reused, significantly improving construction efficiency and accuracy.

[0056] Based on the description and accompanying drawings of this invention, those skilled in the art can easily manufacture or use the near-shore photovoltaic composite pile and its construction method as described in this invention, and can achieve the positive effects described in this invention.

[0057] Unless otherwise specified, in this invention, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this invention are for illustrative purposes only and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0058] Unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A near-shore photovoltaic composite pile, characterized in that: The system includes an upper pile segment and a lower pile segment arranged coaxially and connected to each other. The diameter of the upper pile segment is smaller than that of the lower pile segment. The upper and lower pile segments are fitted together to form an interface structure for positioning with piling auxiliary tools. The lower pile segment includes a high-strength prestressed concrete pipe pile for implantation into the seabed to provide a load-bearing foundation. The upper pile segment includes a steel pipe pile extending above the water surface for connection to the upper photovoltaic support structure.

2. The offshore photovoltaic composite pile according to claim 1, characterized in that: The upper pile segment includes a steel pipe pile and a connecting steel plate connected to the bottom of the steel pipe pile. The lower pile segment includes a high-strength prestressed concrete pipe pile and an end plate connected to the top of the high-strength prestressed concrete pipe pile. The connecting steel plate is mechanically connected to the end plate, and the outer edge of the top surface of the connecting steel plate, the side surface of the end plate, and the upper side surface of the high-strength prestressed concrete pipe pile work together to form an interface structure that cooperates with the positioning of the pile driving auxiliary tooling.

3. The near-shore photovoltaic composite pile according to claim 2, characterized in that: Both the connecting steel plate and the end plate are circular, and the diameter of the connecting steel plate and the end plate is the same as that of the high-strength prestressed concrete pipe pile. The connecting steel plate, the steel pipe pile, the end plate, and the high-strength prestressed concrete pipe pile are coaxially arranged.

4. The offshore photovoltaic composite pile according to claim 3, characterized in that: The connecting steel plate and the end plate are connected by a plurality of high-strength bolts. The plurality of high-strength bolts are circumferentially located on the inner edge of the top surface of the connecting steel plate, and the inner edge is located on the inner side of the outer edge and the outer side of the steel pipe pile.

5. The offshore photovoltaic composite pile according to claim 2, characterized in that: Multiple stiffening plates are connected between the side of the steel pipe pile and the top surface of the connecting steel plate, and the multiple stiffening plates are arranged at intervals around the outer periphery of the steel pipe pile.

6. A construction method for near-shore photovoltaic composite piles, characterized in that, The construction method, which involves prefabricating the various components of the near-shore photovoltaic composite pile as described in claims 1-5, includes the following steps: S1. After transporting each prefabricated component of the nearshore photovoltaic composite pile to the construction sea area, the high-strength prestressed concrete pipe pile of the lower pile section is sunk into the seabed to the preset depth at the preset pile position, and the top of the pipe pile is made to be above the water surface. S2. Connect the connecting steel plate of the upper pile segment to the end plate with high-strength bolts to form a composite pile; S3. Lifting the pile driving auxiliary tool, placing the pile driving auxiliary tool on the outside of the combined pile, and matching the lower connecting part of the pile driving auxiliary tool with the interface structure so that the steel pipe pile is placed in the cavity of the pile driving auxiliary tool. S4. Continue driving piles, treating the pile driving auxiliary tool and the combined pile as one unit, and hammer the pile driving working surface on the top surface of the pile driving auxiliary tool to continue driving the pile to the design depth. S5: Remove the pile driving auxiliary tooling.

7. The construction method for near-shore photovoltaic composite piles according to claim 6, characterized in that: In step S3, the connection part includes a first connection part and a second connection part. The first connection part is connected to the outer edge, and the second connection part is connected to the side of the end plate and the upper side of the high-strength prestressed concrete pipe pile.

8. A method for constructing near-shore photovoltaic composite piles according to claim 6, characterized in that: The piling auxiliary tooling includes a sleeve, which has a cavity for accommodating steel pipe piles; the lower part of the sleeve is provided with a connection part that cooperates with the interface structure, the top end face of which forms a piling working surface, and the outer side wall of which is provided with lifting lugs for lifting operations.

9. A method for constructing near-shore photovoltaic composite piles according to claim 8, characterized in that: The outer wall of the sleeve is provided with scale lines. In step S4, the pile driving depth is controlled by observing the scale lines on the outer wall of the sleeve.

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