Offshore floating type photovoltaic tensioning type anchoring foundation structure

Abstract

The invention provides an offshore floating type photovoltaic tensioning type anchoring foundation structure, and relates to the technical field of offshore floating type photovoltaics, the offshore floating type photovoltaic tensioning type anchoring foundation structure comprises a suction pile foundation, a foundation top cover, a connecting rod, an anchor eye, a high-strength spring, a first positioning bolt, a piston, a second positioning bolt, a connecting rod base, an annular fixing clamping groove, a filtering baffle and a negative pressure hole; according to the invention, the suction pile structure is combined with the negative pressure damping device, all accessories are in assembly type modular construction design, the corresponding size can be adjusted according to pile foundation design parameters, and a one-anchor multi-chain connection mode is adopted, so that on the premise of ensuring the overall safety of the offshore photovoltaic power station, the overall safety of the offshore photovoltaic power station is ensured. The construction cost of an offshore photovoltaic anchoring system is greatly reduced; the position of the anchor point is indirectly adjusted through the negative pressure damping device, meanwhile, the high-strength spring is extruded to generate counter force, under the combined action of the negative pressure damping device and the high-strength spring, the load borne by the suction pile is reduced, the bearing capacity of the foundation is improved, the acting time of sudden change tension on the anchoring foundation is prolonged, and a buffering area is provided.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore floating photovoltaics, and in particular relates to a tensioned anchoring foundation structure for offshore floating photovoltaics. Background Art

[0002] With the rapid increase in global demand for renewable energy, especially solar energy, a clean and renewable energy form, it has become an important direction for energy transformation in various countries. Under the guidance of the "carbon peak and carbon neutrality" goals, my country is accelerating the development of offshore wind and solar resources, and the development of offshore photovoltaics has gradually become a hot topic.

[0003] Compared with onshore photovoltaic power generation, offshore photovoltaic platforms not only have a wider area and longer sunshine time, but also can effectively avoid the occupation of land resources and the damage to the ecological environment. In addition, offshore photovoltaic platforms can also complement other marine energy projects such as offshore wind power to improve the overall energy utilization efficiency.

[0004] However, offshore photovoltaic platforms operate in complex marine environments for a long time and are subject to a variety of complex environmental loads such as wind and waves. The mooring system is the key to ensuring the reliable installation and normal operation of the power station. The traditional catenary mooring consists of a single steel chain, and its huge weight causes a significant reduction in the bearing capacity of the upper floating structure. Therefore, tensioned mooring systems are often used in deep water. However, tensioned mooring is very easy to deviate from the initial position under harsh environmental conditions, causing the mooring line to be in a cyclical state of tension-relaxation; this cyclic low-frequency mutation tension affects the full contact between the anchor foundation and the seabed, reduces the overall bearing capacity of the foundation, and shortens the service life of the anchor foundation.

[0005] Therefore, in order to cope with the problems of reduced bearing capacity of the anchor foundation and foundation failure caused by excessive tension changes in the tensioned mooring system under harsh environmental conditions, it is very necessary to invent a tensioned anchor foundation structure for offshore floating photovoltaics. Summary of the invention

[0006] To solve the above technical problems, the present invention provides a tensioned mooring foundation structure for floating photovoltaic systems at sea, aiming to address the issue that in harsh environmental conditions, the tensioned mooring is extremely prone to deviating from its initial position, resulting in a cyclic state of tension and relaxation of the mooring line. This cyclic low-frequency sudden change in tension affects the full contact between the anchoring foundation and the seabed, reduces the overall bearing capacity of the foundation, and shortens the service life of the anchoring foundation. To address the problems of reduced bearing capacity of the anchoring foundation and foundation failure caused by excessive tension changes in the tensioned mooring system under harsh environmental conditions. A tensioned mooring foundation structure for floating photovoltaic systems at sea includes a suction pile foundation, a filter baffle, a foundation top cover, and a negative pressure shock absorption device. The main parts of the filter baffle and the negative pressure shock absorption device are installed inside the suction pile foundation. Two negative pressure holes are arranged on both sides of the suction pile foundation below the installation position of the filter baffle. The negative pressure holes are used for negative pressure sinking of the foundation. The foundation top cover is installed on the upper side of the suction pile foundation.

[0007] The negative pressure shock absorption device includes an anchor eye, a connecting rod, a first positioning bolt, a high-strength spring, a second positioning bolt, a piston, and a connecting rod base. The anchor eye is installed at the top of the connecting rod, and the anchor eye is used to install the anchor chain to connect the anchor chain with the offshore photovoltaic structure. The connecting rod base is connected to the bottom of the connecting rod by high-strength bolts. The connecting rod and the connecting rod base are connected by welding to form an integral body. The bottom surface of the piston is connected to the connecting rod base by four bolts, and the top surface of the piston is connected to the second positioning bolt. The first positioning bolt is installed at the lower end of the foundation top cover. The high-strength spring is installed outside the connecting rod and is located between the first positioning bolt and the second positioning bolt.

[0008] Furthermore, the foundation top cover includes a skirt plate and a top plate. The top plate has a central opening, and the diameter of the opening in the top plate is the same as the diameter of the connecting rod. The inner diameter of the skirt plate is the same as the outer diameter of the suction pile foundation. The height of the skirt plate is the same as the radius of the central opening of the top plate.

[0009] Furthermore, the connection between the skirt plate and the top plate is welded to form an integral body. The connection between the inner wall of the foundation top cover and the outer wall of the suction pile foundation is welded. The filter baffle is installed at the bottom of the negative pressure shock absorption device, and the filter baffle is connected to the suction pile foundation through a side annular fixed slot. The maximum diameters of the piston and the first positioning bolt are the same as the inner diameter of the suction pile foundation.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. In the present invention, the suction pile structure is combined with the negative pressure shock absorption device. The structural form is simple, and all accessories are designed for prefabricated modular construction. The corresponding size can be adjusted according to the pile foundation design parameters, making manufacturing and installation more convenient. Moreover, the connection method of one anchor with multiple chains is adopted, which greatly reduces the construction cost of the offshore photovoltaic anchoring system on the premise of ensuring the overall safety of the offshore photovoltaic power station.

[0012] 2. In the present invention, the anchor point position is not fixed. When the mooring line is subjected to a sudden tension, the position of the anchor point can be indirectly adjusted by using the negative pressure shock absorption device, and the length of the mooring line can be adjusted, effectively controlling the magnitude of the mooring line tension. At the same time, an additional negative pressure is generated inside the suction pile, and the high-strength spring is compressed to generate a reaction force. Under the combined action of the two, the load on the suction pile is reduced, the foundation bearing capacity is improved, and the time for the sudden tension to act on the anchoring foundation is extended, providing a buffer interval, solving the problem that the suction pile foundation fails due to fatigue under the cyclic sudden load of the mooring line in a harsh weather environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic plan view of the structure of the present invention.

[0014] Figure 2 It is a schematic view of the interior of the present invention.

[0015] Figure 3 It is a three-dimensional schematic view of the overall structure and each component of the present invention.

[0016] Figure 4 It is a schematic view of the foundation top cover size.

[0017] Figure 5 It is a schematic view of the first positioning bolt.

[0018] Figure 6 It is a top view of the first positioning bolt.

[0019] Figure 7 It is a schematic view of the high-strength spring.

[0020] Figure 8 It is a top view of the high-strength spring.

[0021] Figure 9 It is a schematic view of the second positioning bolt.

[0022] Figure 10 It is a top view of the second positioning bolt.

[0023] Figure 11 It is a schematic view of the piston.

[0024] Figure 12 It is a top view of the piston.

[0025] Figure 13 Schematic diagram of the connecting rod base

[0026] Figure 14 Schematic diagram of another perspective of the connecting rod base

[0027] Figure 15 Schematic diagram of the filter baffle

[0028] Figure 16 Schematic diagram of another perspective of the filter baffle

[0029] Figure 17 Schematic diagram of the in-service state of the anchoring foundation

[0030] In the figure:

[0031] 1. Suction pile foundation; 2. Foundation top cover; 3. Connecting rod; 4. Anchor eye; 5. High-strength spring; 6. First positioning bolt; 7. Piston; 8. Second positioning bolt; 9. Connecting rod base; 10. Annular fixed card slot; 11. Filter baffle; 12. Negative pressure hole; 13. Photovoltaic structure; 14. Anchor chain Specific implementation mode

[0032] The following further describes the present invention in conjunction with the attached drawings:

[0033] Embodiment:

[0034] As Figures 1-17 shown, the present invention provides a tension-type anchoring foundation structure for offshore floating photovoltaic, including a suction pile foundation 1, a filter baffle 11, a foundation top cover 2 and a negative pressure damping device. The filter baffle 11 and the main part of the negative pressure damping device are installed inside the suction pile foundation 1; two negative pressure holes 12 are arranged on both sides of the suction pile foundation 1 below the installation position of the filter baffle 11; the negative pressure holes 12 are used for the negative pressure sinking of the foundation; the foundation top cover 2 is installed on the upper side of the suction pile foundation 1;

[0035] The negative pressure damping device includes an anchor eye 4, a connecting rod 3, a first positioning bolt 6, a high-strength spring 5, a second positioning bolt 8, a piston 7 and a connecting rod base 9; the anchor eye 4 is installed at the top of the connecting rod 3, and the anchor eye 4 is used for installing the anchor chain 14 to connect the anchor chain 14 with the offshore photovoltaic structure 13; the connecting rod base 9 is connected to the bottom of the connecting rod 3 by high-strength bolts; the connecting rod 3 and the connecting rod base 9 are connected by welding to make the connecting rod 3 and the connecting rod base 9 an integral body; the bottom surface of the piston 7 is connected to the connecting rod base 9 by four bolts, and the top surface of the piston 7 is connected to the second positioning bolt 8. The first positioning bolt 6 is installed at the lower end of the foundation top cover 2; the high-strength spring 5 is installed outside the connecting rod 3, and the high-strength spring 5 is located between the first positioning bolt 6 and the second positioning bolt 8.

[0036] Furthermore, the basic top cover 2 includes a skirt plate and a top plate; a hole is opened in the center of the top plate, and the diameter of the hole in the top plate is the same as the diameter of the connecting rod 3; the inner diameter of the skirt plate is the same as the outer diameter of the suction pile foundation 1; the height of the skirt plate is the same as the radius of the central hole in the top plate.

[0037] Furthermore, the connection between the skirt plate and the top plate is welded to make the skirt plate and the top plate an integral body; the connection between the inner wall of the basic top cover 2 and the outer wall of the suction pile foundation 1 is welded; the filter baffle 11 is installed at the bottom of the negative pressure shock absorption device, and the filter baffle 11 is connected to the suction pile foundation 1 through the side annular fixed card slot 10; the maximum diameters of the piston 7 and the first positioning bolt 6 are the same as the inner diameter of the suction pile foundation 1.

[0038] Shock-absorbing spacers are provided between the connecting rod base 9 and the piston 7, between the piston 7 and the second positioning bolt 8, and between the first positioning bolt 9 and the high-strength spring 5. For the purpose of clearly showing the sample diagrams of each component, no details of the spacers are described. In addition, due to the display effect, the detailed details of each layer of the baffle are not shown in the figure for the filter baffle 11.

[0039] In Figure 4 the dimensions shown, D1 represents the inner diameter of the top plate, the inner diameter of the top plate is the same as the outer diameter of the suction pile foundation 1, t1 is the thickness of the skirt plate, and d is the diameter of the connecting rod 3.

[0040] In Figures 5-6 the dimensions shown, D2 represents the diameter of the top layer of the first positioning bolt 6, which is the same as the inner diameter of the suction pile foundation 1, D3 represents the diameter of the middle layer of the first positioning bolt 6, D4 represents the diameter of the bottom layer of the first positioning bolt 6, h1 represents the thickness of the top layer of the first positioning bolt 6, h2 represents the thickness of the middle layer of the first positioning bolt 6, and h3 represents the thickness of the bottom layer of the first positioning bolt 6.

[0041] In Figures 7-8 the dimensions shown, D4 represents the outer diameter of the high-strength spring 5, the diameter of the high-strength spring 5 is 0.1d, the spiral pitch of the high-strength spring 5 is 0.5d, and the total height of the high-strength spring 5 is 4d.

[0042] In Figures 9-10 the dimensions shown, D3 represents the diameter of the top layer of the second positioning bolt 8, D4 represents the diameter of the bottom layer of the second positioning bolt 8, the thickness of the top layer of the second positioning bolt 8 is h3, and the thickness of the bottom layer of the second positioning bolt 8 is h2.

[0043] In Figures 11-12 the dimensions shown, D2 represents the diameter of the middle layer of the piston 7, which is the same as the inner diameter of the suction pile foundation 1, D3 represents the diameters of the second and fourth layers of the piston 7, D4 represents the diameters of the top and bottom layers, the thickness of the middle layer is h4, and the thicknesses of the other four layers are all h2.

[0044] InFigures 13-14 Among the dimensions that appear, D3 represents the diameter of the middle layer of the connecting rod base 9, D4 represents the diameter of the top layer of the connecting rod base 9, the bottom layer diameter is 0.5d, the top layer thickness is h2, the middle layer and the bottom layer thickness is h3, the bolt hole spacing of the symmetric distribution is 1.2d, and the groove depth connected to the connecting rod 3 is 0.1d.

[0045] Among Figures 15-16 Among the dimensions that appear, D2 represents the outer diameter of the top layer and the second layer of the filter baffle 11, D3 represents the inner diameter of the second layer of the filter baffle 11, the diameter of the annular fixed card slot 10 is 0.1d, the top baffle thickness is 0.1d, the second baffle thickness is h2, the height spacing between the second layer and the third layer of the baffle is 0.3d, the spacing between the third layer and the bottom layer of the baffle is 0.3d, the diameter of the third layer of the baffle is 1.2d, and the diameter of the bottom layer of the baffle is 0.5d.

[0046] Working principle

[0047] In the present invention, the suction pile foundation 1, the foundation top cover 2, the filter baffle 11 and the negative pressure shock absorption device are pre-assembled on land in advance, and then the suction pile structure is lifted by a crane and slowly sunk to the seabed at a preset position. First, it sinks by the self-weight of the suction pile structure, and then the water is pumped out through the negative pressure holes 12 on both sides of the suction pile foundation 1 to make the inside of the suction pile foundation 1 in a negative pressure state and continue to sink until it reaches the designed specified depth, and then the negative pressure holes are closed; finally, the floating body structure on the sea surface is towed to the preset position, and then the floating body structure is flexibly connected through the connecting piece to form a photovoltaic array, so as to complete the installation of the entire mooring system. When the foundation is subjected to a sudden tensile force, the pull rod 3 will drive the piston 7 to move upward, generating a negative pressure in the suction pile foundation 1. At the same time, the high-strength spring 5 is compressed to generate a reaction force. The combined action of the two shares a large part of the load for the foundation, achieving the effect of improving the bearing capacity of the foundation; when the sudden tension disappears, the negative pressure gradually disappears, and the pull rod gradually returns to its original position under the action of the high-strength spring;

[0048] The usage method of the present invention is as follows:

[0049] Determine the structural parameters and installation position of the suction pile foundation 1, and prefabricate each component of the suction pile foundation 1, the foundation top cover 2, the filter baffle 11 and the negative pressure shock absorption device based on the structural parameters. It should be noted that the suction pile foundation 1 needs to reserve an additional overall height for the negative pressure shock absorption device for subsequent installation.

[0050] Before the foundation is put into water, the filter baffle 11 is installed on the suction pile foundation 1 through the annular fixing groove 10, and the suction pile foundation 1, the negative pressure shock absorbing device and the foundation top cover 2 are assembled in advance to form a whole, and then the suction pile foundation 1 is slowly sunk to the seabed surface by using the offshore lifting platform. The suction pile structure will fall and penetrate into the soil under the action of its own weight. After the suction pile structure has completed sinking due to its own weight, the negative pressure holes 12 on both sides of the suction pile foundation 1 are used to pump water outward, so that the inside of the suction pile foundation 1 is in a negative pressure state and continues to sink until it reaches the designed specified depth.

[0051] When the foundation is subjected to a sudden tensile force, the pull rod 3 will drive the piston 6 to move upward, generating negative pressure under the suction pile foundation 1. At the same time, the high-strength spring 5 is squeezed to generate a reaction force. The combined effect of the two allows the foundation to share a larger part of the load and delays the action time of the sudden tension, thereby alleviating the impact of the sudden load on the foundation. When the sudden tension disappears, the negative pressure gradually disappears, and the pull rod 3 gradually returns to its original position under the action of the high-strength spring 1.

[0052] Utilizing the technical solution of the present invention, or those skilled in the art designing similar technical solutions inspired by the technical solution of the present invention to achieve the above-mentioned technical effects, all fall within the protection scope of the present invention.

Claims

1. A tensioned anchoring foundation structure for an offshore floating photovoltaic system, characterized in that: It includes a suction pile foundation (1), a filter baffle (11), a foundation top cover (2) and a negative pressure shock absorption device. The filter baffle (11) and the main part of the negative pressure shock absorption device are installed inside the suction pile foundation (1); two negative pressure holes (12) are arranged below the installation positions of the filter baffle (11) on both sides of the suction pile foundation (1); the foundation top cover (2) is installed on the upper side of the suction pile foundation (1). The negative pressure shock absorption device includes an anchor eye (4), a connecting rod (3), a first positioning bolt (6), a high-strength spring (5), a second positioning bolt (8), a piston (7) and a connecting rod base (9); the anchor eye (4) is installed at the top of the connecting rod (3); the connecting rod base (9) is connected to the bottom of the connecting rod (3) by high-strength bolts; the connecting rod (3) and the connecting rod base (9) are connected by welding to make the connecting rod (3) and the connecting rod base (9) an integral body; the bottom surface of the piston (7) is connected to the connecting rod base (9) by four bolts, and the top surface of the piston (7) is connected to the second positioning bolt (8). The first positioning bolt (6) is installed at the lower end of the foundation top cover (2); the high-strength spring (5) is installed outside the connecting rod (3), and the high-strength spring (5) is located between the first positioning bolt (6) and the second positioning bolt (8).

2. The tension-type anchoring foundation structure for offshore floating photovoltaic according to claim 1, wherein: The negative pressure hole (12) is used for the negative pressure sinking of the foundation.

3. The tensioned anchoring foundation structure for offshore floating photovoltaic according to claim 1, wherein: The anchor eye (4) is used for installing an anchor chain (14) to connect the anchor chain (14) to the offshore photovoltaic structure (13).

4. The tensioned anchoring foundation structure for offshore floating photovoltaic according to claim 1, characterized in that: The foundation top cover (2) includes a skirt plate and a top plate; a hole is opened in the center of the top plate, and the diameter of the hole in the top plate is the same as the diameter of the connecting rod (3); the inner diameter of the skirt plate is the same as the outer diameter of the suction pile foundation (1); the height of the skirt plate is the same as the radius of the central hole in the top plate.

5. The tensioned anchoring foundation structure for offshore floating photovoltaic according to claim 4, wherein: The joint between the skirt plate and the top plate is connected by welding to make the skirt plate and the top plate an integral body.

6. The tension-type anchoring foundation structure for offshore floating photovoltaic according to claim 1, characterized in that: The joint between the inner wall of the foundation top cover (2) and the outer wall of the suction pile foundation (1) is connected by welding.

7. The tension-type anchoring foundation structure for offshore floating photovoltaic according to claim 1, characterized in that: The filter baffle (11) is installed at the bottom of the negative pressure shock absorption device, and the filter baffle (11) is connected to the suction pile foundation (1) through a side annular fixing slot (10).

8. The tensioned anchoring foundation structure for offshore floating photovoltaic according to claim 1, characterized in that: The maximum diameters of the piston (7) and the first positioning bolt (6) are the same as the inner diameter of the suction pile foundation (1).

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