Adaptive fence type anchor foundation for offshore floating photovoltaic projects and its application method

Abstract

The present invention relates to the field of marine engineering and foundation engineering technology, and discloses an adaptive fence-type anchor foundation for an offshore floating photovoltaic project, comprising a non-perforated system, wherein the inner wall of the non-perforated system is rotatably connected with a plurality of rotation systems, both sides of the outer wall of the rotation system are fixedly connected with a self-weight penetration system, one side of the outer wall of the rotation system is rotatably connected with a fence system, the non-perforated system comprises positioning pins, wherein a plurality of the positioning pins are fixedly connected to the upper and lower ends of the inner wall of the non-perforated system, and the self-weight penetration system comprises iron nails, wherein a plurality of the iron nails are fixedly connected to the four corners of one side of the self-weight penetration system. The foundation fence structure is rotated, so that when the foundation generates the risk of anchoring under the action of the ultimate load, the soil can be stimulated to generate a downward force on the anchor foundation, so that the foundation can automatically generate a downward penetration load when horizontal displacement occurs, thereby ensuring the overall stability of the project when encountering extreme working conditions.

Description

Technical Field

[0001] The present invention relates to the fields of marine engineering and foundation engineering technology, and in particular to an adaptive fence-type anchoring foundation for an offshore floating photovoltaic project and an application method thereof. Background Art

[0002] Entering the 21st century, the energy crisis has become increasingly prominent. As a new type of offshore energy development method, offshore floating photovoltaic power generation systems are gradually attracting people's attention and attention. As an important guarantee for the safe and stable operation of offshore floating photovoltaic power generation systems, the design, manufacturing and installation technology of anchor foundations have a vital impact on the stability, safety and life of the entire system.

[0003] According to the current development status of offshore floating projects, gravity anchor foundation is a kind of anchor foundation with good technical and economic performance in offshore floating photovoltaic projects. However, due to its own structural characteristics, this foundation form still has the following key problems to be solved:

[0004] 1. The anchoring bearing capacity that the foundation can provide has limitations: The penetration depth of the traditional gravity anchoring foundation during installation is relatively greatly affected by the strength of the marine bottom soil. When the strength of the bottom soil is low, the foundation can reach a greater penetration depth under the action of its own weight during installation, but due to the strength of the marine bottom soil, the anchoring bearing capacity of the foundation is greatly limited; and when the strength of the bottom soil is high, the penetration resistance during foundation installation is relatively large, so it is difficult for the foundation to reach a greater penetration depth during installation. Therefore, the ultimate anchoring bearing capacity that the anchoring foundation can provide is also difficult to reach a high level, and it is difficult to meet the current design requirements of offshore floating photovoltaic projects.

[0005] 2. The safety reserve of the design bearing capacity is limited: In order to solve the above problems more technically and economically, the current marine floating photovoltaic gravity anchor foundation adopts an open hole design. Since its top surface area has been reduced to a certain extent, its penetration resistance in the marine soil has also been reduced accordingly, and it is easier to penetrate to the predetermined depth during the installation process. However, due to the reduction of its top surface area, its anchor bearing capacity, especially the horizontal bearing capacity, has also been reduced to a certain extent. At the same time, when this type of anchor foundation is subjected to extreme loads exceeding the design, the safety reserve of the foundation bearing capacity is relatively low, and it cannot provide more resistance when the foundation is displaced. Therefore, it is more likely to cause accidents such as anchor dragging that endanger the overall safety of offshore floating projects.

[0006] To this end, those skilled in the art provide an adaptive fence-type anchoring foundation for offshore floating photovoltaic projects and an application method thereof to solve the problems raised. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides an adaptive fence-type anchor foundation for an offshore floating photovoltaic project and an application method thereof, which solves the problems of limited bearing capacity and limited safety reserve in the prior art.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: an adaptive fence-type anchor foundation for an offshore floating photovoltaic project, comprising a non-perforated system, the inner wall of the non-perforated system is rotatably connected to multiple rotation systems, both sides of the outer wall of the rotation system are fixedly connected to a self-weight penetration system, and one side of the outer wall of the rotation system is rotatably connected to a fence system.

[0009] Preferably, the non-perforated system includes positioning pins, and a plurality of the positioning pins are fixedly connected to the upper and lower ends of the inner wall of the non-perforated system.

[0010] Preferably, the self-weight penetration system includes iron nails, and a plurality of the iron nails are fixedly connected to the four corners of one side of the self-weight penetration system.

[0011] Preferably, a plurality of the self-weight penetration systems are fixedly connected to both sides of the outer wall of the non-perforated system.

[0012] Preferably, the fence system is slidably connected to one side of a plurality of positioning pins.

[0013] The application method of the adaptive fence type anchor foundation of an offshore floating photovoltaic project, according to the adaptive fence type anchor foundation of an offshore floating photovoltaic project according to claims 1-5, is characterized by comprising the following steps:

[0014] S1. First, the foundation is customized on land. The concrete part above the foundation is customized using a dedicated mold. The mixed concrete is poured into the mold and demoulded after reaching the use strength. At the same time, the fence structure is customized with steel materials. According to the design requirements of the drawings, the strength of the material is guaranteed to be sufficient.

[0015] S2. Use a steel plate punch to cut the fence structure. The opening should correspond to the upper concrete structure without misalignment. Use an angle grinder to grind the holes. Install the rotating system at the center of the fence structure and connect it with the non-opening system and the self-weight penetration system in sequence. Add anti-corrosion materials to the welding part below the self-weight penetration system. Pay attention to the structural strength of the nails and select the appropriate length, width and height. At the same time, weld the positioning pins inside the non-opening system structure.

[0016] S3. Multiple customized structures are hoisted to the target sea area, and the structures are welded as a whole on the hoisting ship. After the above is completed, they are sunk in the target sea area. After the foundation is stably in contact with the mud surface, the hoisting cable is released. The foundation will penetrate to the designed depth under the action of its own weight or counterweight, and the anchor foundation officially begins to work, providing the corresponding anchor bearing capacity for the floating photovoltaic system;

[0017] S4. Under the action of mooring load, the foundation will produce horizontal movement or corresponding movement trend, and interact with the marine soil. Under the action of soil pressure, the fence system will rotate in the opposite direction to the movement trend of the foundation. After rotating to a predetermined angle, it will contact the positioning pin and stop rotating. At this time, the foundation will continue to move horizontally, but because the fence system has a certain angle with the mud surface, it will stimulate the surrounding soil to exert a downward force on the foundation, causing the foundation to have a downward movement trend, causing the foundation to further penetrate into the soil; when the foundation is subjected to mooring load, the fence system does not rotate 360°. When facing external extreme mooring loads, the rotation angle of the fence system becomes larger, but due to the presence of positioning pins, the rotation angle of the fence system will be limited to ensure that it maximizes the foundation penetration depth when facing extreme mooring loads and ensure the overall safety of the project.

[0018] Working principle: Use an angle grinder to grind the punched holes, install the rotating system in the center of the fence structure, and connect it with the non-perforated system and the self-weight penetration system in turn. Add anti-corrosion materials to the welding points below the self-weight penetration system, and hoist the customized multiple structures to the target sea area. Weld the structure as a whole on the hoisting ship. After the above is completed, sink it in the target sea area, and release the cable after the foundation stably contacts the mud surface. The foundation will penetrate to the designed depth under the action of its own weight or counterweight, and the anchor foundation will officially start to work. Under the action of the mooring load, the foundation will have horizontal movement or corresponding movement trend, and interact with the marine soil, prompting the fence system to develop under the action of soil pressure. The fence system rotates in the opposite direction to the movement trend of the foundation. After rotating to a predetermined angle, it contacts the positioning pin and stops rotating. At this time, the foundation will continue to move horizontally, but because the fence system has a certain angle with the mud surface, it will stimulate the surrounding soil to exert a downward force on the foundation, prompting the foundation to have a downward movement trend, causing the foundation to further penetrate into the soil; when the foundation is subjected to mooring loads, the fence system does not rotate 360°. When facing external extreme mooring loads, the rotation angle of the fence system becomes larger, but due to the presence of the positioning pin, the rotation angle of the fence system will be limited to ensure that it maximizes the foundation penetration depth when facing extreme mooring loads and ensure the overall safety of the project.

[0019] The present invention provides an adaptive fence-type anchor foundation for offshore floating photovoltaic projects and an application method thereof. It has the following beneficial effects:

[0020] The present invention rotates the foundation fence structure, so that when the foundation is at risk of dragging anchor under the action of the extreme load, the soil can be stimulated to generate a downward force on the anchor foundation, prompting the foundation to automatically generate a downward penetration load when it is horizontally displaced, ensuring the overall stability of the project when encountering extreme working conditions, and to a certain extent guaranteeing the motion displacement response of the floating structure, ensuring that the project will not produce uncontrollable subsequent disasters, and reducing the risk of offshore floating photovoltaic projects. At the same time, hierarchical customization increases the customization rate of the foundation, making it easier to transport, install, migrate, recycle and reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a front view of the non-opening system of the present invention;

[0023] Figure 3 A top view of the fence system of the present invention;

[0024] Figure 4 It is a side view of the self-weight penetration system of the present invention;

[0025] Figure 5 It is a three-dimensional diagram of the self-weight penetration system of the present invention;

[0026] Figure 6 It is a three-dimensional schematic diagram of the non-opening system of the present invention;

[0027] Figure 7 A three-dimensional schematic diagram of the force rotation of the fence system of the present invention;

[0028] Figure 8 It is a three-dimensional schematic diagram of the installation of the fence removal system of the present invention.

[0029] Among them, 1. Non-perforated system; 2. Fence system; 3. Self-weight penetration system; 4. Rotation system; 101. Positioning pin; 301. Iron nail. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] Please see attached Figure 1 -Attached Figure 3An embodiment of the present invention provides an adaptive fence-type anchoring foundation for an offshore floating photovoltaic project, including a non-perforated system 1, the inner wall of the non-perforated system 1 is rotatably connected to a plurality of rotating systems 4, both sides of the outer wall of the rotating system 4 are fixedly connected to a self-weight penetration system 3, one side of the outer wall of the rotating system 4 is rotatably connected to a fence system 2, the non-perforated system 1 includes a positioning pin 101, and the plurality of positioning pins 101 are fixedly connected to the upper and lower ends of the inner wall of the non-perforated system 1, and the self-weight penetration system 3 includes an iron nail 301, and the plurality of iron nails 301 are fixedly connected to the four corners of one side of the self-weight penetration system 3.

[0033] A mold that conforms to the design drawings is used to make an anchor shallow foundation, and concrete is placed in the mold. After the concrete hardens in the mold, it can be cured with a relevant curing liquid. After the mold is formed, a laser cutting machine is used to make the non-perforated system 1, and steel materials are used to make the fence system 2, the self-weight penetration system 3 and the rotation system 4 according to the drawings to ensure that the fence system 2 rotates smoothly. Among them, the length of the rotation system 4 should be consistent with the width of the self-weight penetration system 3 and the non-perforated system 1 assembled together to achieve the purpose of saving materials.

[0034] The positioning pin 101 is welded at the relevant position of the non-perforated system 1 according to the drawing. The bottom surface of the self-weight penetration system 3 is made of steel material, and the iron nail 301 is welded to increase the foundation sinking depth. Then assemble on the platform, first pass the steering rod through the non-perforated system 1, the fence system 2 and the self-weight penetration system 3, weld the self-weight penetration system 3-1 and the steering rod to prevent the steering rod from rotating, and then weld the self-weight penetration system 3 and the non-perforated system 1 to ensure that the rotation system 4 is used as a fixed shaft to rotate the fence system 2 to ensure the integrity of the foundation as a whole.

[0035] Please see attached Figure 4 -Attached Figure 5 A plurality of self-weight penetration systems 3 are fixedly connected to both sides of the outer wall of the non-perforated system 1 , and the self-weight penetration systems 3 on both sides are connected and locked, thereby ensuring that the fence system 2 can stably rotate in the non-perforated system 1 .

[0036] Please see attached Figure 2 -Attached Figure 3 The fence system 2 is slidably connected to one side of a plurality of positioning pins 101 , and the positioning pins 101 are used to fully limit the rotatable range of the fence system 2 .

[0037] Embodiment 2:

[0038] Please see attached Figure 6 -Attached Figure 8 Based on the first embodiment, this embodiment provides an application method of an adaptive fence type anchor foundation for an offshore floating photovoltaic project, comprising the following steps:

[0039] S1. First, the foundation is customized on land. The concrete part above the foundation is customized using a dedicated mold. The mixed concrete is poured into the mold and demoulded after reaching the use strength. At the same time, the fence structure is customized with steel materials. According to the design requirements of the drawings, the strength of the material is guaranteed to be sufficient.

[0040] S2. Use a steel plate punch to cut the fence structure. The opening should correspond to the upper concrete structure without misalignment. Use an angle grinder to grind the opening. Install the rotating system 4 at the center of the fence structure and connect it with the non-opening system 1 and the self-weight penetration system 3 in sequence. Add anti-corrosion materials to the welding part below the self-weight penetration system 3. Pay attention to the structural strength of the nail 301 and select the appropriate length, width and height. At the same time, weld the positioning pin 101 inside the non-opening system 1 structure.

[0041] S3. Multiple customized structures are hoisted to the target sea area, and the structures are welded as a whole on the hoisting ship. After the above is completed, they are sunk in the target sea area. After the foundation is stably in contact with the mud surface, the hoisting cable is released. The foundation will penetrate to the designed depth under the action of its own weight or counterweight, and the anchor foundation officially begins to work, providing the corresponding anchor bearing capacity for the floating photovoltaic system;

[0042] S4. Under the action of the mooring load, the foundation will produce horizontal movement or a corresponding movement trend, and interact with the marine soil. Under the action of soil pressure, the fence system 2 is prompted to rotate in the opposite direction to the movement trend of the foundation. After rotating to a predetermined angle, it contacts the positioning pin 101 and stops rotating. At this time, the foundation will continue to move horizontally, but because the fence system 2 has a certain angle with the mud surface, it will stimulate the surrounding soil to exert a downward force on the foundation, prompting the foundation to have a downward movement trend, causing the foundation to further penetrate into the soil; when the foundation is subjected to the mooring load, the fence system 2 does not rotate 360°. When facing external extreme mooring loads, the rotation angle of the fence system 2 becomes larger, but due to the presence of the positioning pin 101, the rotation angle of the fence system 2 will be limited to ensure that it maximizes the foundation penetration depth when facing extreme mooring loads, thereby ensuring the overall safety of the project.

[0043] When placed on the seabed, the foundation will first reach the expected penetration depth through its own deadweight and deadweight penetration system 3. At this time, the mooring load generated by the floating photovoltaic system will act on the foundation, causing the foundation to have a horizontal movement trend. Due to the effect of the mooring load, it is difficult for the foundation to maintain a corresponding balance at the penetration position, causing the foundation to interact with the marine soil, causing the fence system 2 to rotate. Since the foundation is subject to the mooring load and has a horizontal movement trend, it interacts with the mooring load direction of the soil system in front during the movement, generating a resistance in the opposite direction of the movement on the foundation, causing the fence system 2 of the foundation to rotate in the opposite direction of the mooring load, but the rotation is not 360° unlimited rotation. The presence of the positioning pin 101 limits the rotation angle, preventing the fence system 2 from rotating without limit, reducing the overall safety of the project. The fence system 2 acts on the surrounding soil, stimulating the soil to exert a downward force on the foundation, causing the foundation to have a downward movement trend.

[0044] At present, gravity-anchored shallow foundations are generally penetrated by self-weight. In sea areas with low soil strength, the foundation will increase the overall penetration and sinking depth of the foundation through the above-mentioned stress conditions, indirectly improving the overall stability of the project; in sea areas with high soil strength, the foundation is penetrated by self-weight, which will result in a limited penetration depth of the foundation into the soil, and there is a risk of anchor dragging, making it difficult to ensure the overall bearing performance of the project. If the foundation passes the above-mentioned stress conditions, then in sea areas with high soil strength, the foundation will first be penetrated to a stable state by self-weight. At this time, when subjected to horizontal loads, the stable foundation will be penetrated again to improve the overall bearing performance of the foundation.

[0045] When the foundation is subjected to extreme mooring loads, the current anchored shallow foundation adopts an open hole design, which reduces the penetration resistance between the marine soil, but the bearing capacity of the foundation is also reduced to a certain extent. As a result, safety accidents are very likely to occur when the foundation is subjected to extreme mooring loads. When the foundation adopts the above-mentioned stress conditions, in the face of extreme mooring loads, the foundation has a downward movement trend, which improves the bearing capacity of the foundation and ensures the safety of the project.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adaptive fence-type anchor foundation for an offshore floating photovoltaic project, comprising a non-perforated system (1), characterized in that: The inner wall of the non-perforated system (1) is rotatably connected to a plurality of rotating systems (4), both sides of the outer wall of the rotating system (4) are fixedly connected to self-weight penetration systems (3), and one side of the outer wall of the rotating system (4) is rotatably connected to a fence system (2); The non-perforated system (1) comprises positioning pins (101), and a plurality of the positioning pins (101) are fixedly connected to the upper and lower ends of the inner wall of the non-perforated system (1); The fence system (2) is slidably connected to one side of a plurality of positioning pins (101).

2. The adaptive fence type anchor foundation for offshore floating photovoltaic engineering according to claim 1 is characterized in that: The self-weight penetration system (3) comprises iron nails (301), and a plurality of the iron nails (301) are fixedly connected to four corners of one side of the self-weight penetration system (3).

3. The adaptive fence type anchor foundation for offshore floating photovoltaic engineering according to claim 1 is characterized in that: A plurality of the self-weight penetration systems (3) are fixedly connected to both sides of the outer wall of the non-opening system (1).

4. An application method of an adaptive fence type anchor foundation for an offshore floating photovoltaic project, according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. First, the foundation is customized on land. The concrete part above the foundation is customized using a dedicated mold. The mixed concrete is poured into the mold and demoulded after reaching the use strength. At the same time, the fence structure is customized with steel materials. According to the design requirements of the drawings, the strength of the material is guaranteed to be sufficient. S2. Use a steel plate punch to cut the fence structure. The opening should correspond to the upper concrete structure without misalignment. Use an angle grinder to grind the opening. Install the rotating system (4) at the center of the fence structure and connect it to the non-opening system (1) and the self-weight penetration system (3) in sequence. Add anti-corrosion materials to the welding part below the self-weight penetration system. Pay attention to the structural strength of the iron nail (301) and select the appropriate length, width and height. At the same time, weld the positioning pin (101) inside the non-opening system (1) structure. S3. Multiple customized structures are hoisted to the target sea area, and the structures are welded as a whole on the hoisting ship. After the above is completed, they are sunk in the target sea area. After the foundation is stably in contact with the mud surface, the hoisting cable is released. The foundation will penetrate to the designed depth under the action of its own weight or counterweight, and the anchor foundation officially begins to work, providing the corresponding anchor bearing capacity for the floating photovoltaic system; S4. Under the action of the mooring load, the foundation will generate horizontal movement or a corresponding movement trend, and interact with the marine soil. Under the action of the soil pressure, the fence system (2) will rotate in the opposite direction to the movement trend of the foundation. After rotating to a predetermined angle, it will contact the positioning pin (101) and stop rotating. At this time, the foundation will continue to move horizontally, but because the fence system (2) and the mud surface have a certain angle, it will stimulate the surrounding soil to exert a downward force on the foundation, causing the foundation to generate a downward movement trend, resulting in the foundation further penetrating into the soil. When the foundation is subjected to the mooring load, the fence system (2) does not rotate 360 ​​degrees. When facing the external extreme mooring load, the rotation angle of the fence system (2) becomes larger. However, due to the presence of the positioning pin (101), the rotation angle of the fence system (2) will be limited, ensuring that the foundation penetration depth is maximized when facing the extreme mooring load, thereby ensuring the overall safety of the project.

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