Photovoltaic power station foundation structure suitable for fly ash foundation

Abstract

The utility model relates to a photovoltaic power station foundation structure suitable for a coal ash foundation, and relates to the technical field of construction of coal ash foundations. The reinforcing layer, the buffer layer and the concrete layer are sequentially arranged from bottom to top in the foundation pit, side blocking ribs and extending baffles are arranged on the side walls of the foundation pit, and extending grooves are formed in the bottom of the foundation pit; ground piles and mounting cones are arranged in the reinforcing layer, the bottoms of the ground piles extend out of the reinforcing layer and are in threaded connection with the mounting sleeves, and mounting caps are arranged at the tops of the ground piles and can be grouted; the buffer layer is a mixture of grit and fly ash, and a steel bar net rack is arranged in the side retaining ribs. The effects of improving the stability of the foundation, enhancing the anti-pressure capability and prolonging the service life are achieved.

Description

Technical Field

[0001] This application relates to the field of foundation structure technology, and in particular to a foundation structure for photovoltaic power plants suitable for fly ash foundations. Background Technology

[0002] The foundation structure is a critical component ensuring the stability and durability of a building. Its design and construction must consider various factors, including soil type, groundwater level, load conditions, and environmental factors. A foundation structure typically consists of several main layers, each serving a specific function.

[0003] In related technologies, a foundation structure is typically set within a pre-excavated pit, with a reinforcement layer, a buffer layer, and a concrete layer arranged sequentially from bottom to top inside the pit. The reinforcement layer, used to improve the bearing capacity and stability of the foundation, incorporates reinforcing materials such as steel bars, geogrids, or chemical reinforcing agents. This layer enhances the overall performance of the foundation, reduces settlement, and improves seismic resistance. The buffer layer, usually composed of crushed stone, sand, or other coarse-grained materials, improves drainage, reduces soil compressibility, and provides a uniform support surface to minimize uneven settlement. The concrete layer directly bears the building load, facilitating subsequent construction.

[0004] The aforementioned technologies have the following drawbacks: the foundation pit is usually square in actual excavation, and its sidewalls are usually set vertically. Therefore, the bottom reinforcement layer is also square in actual construction, such as after concrete pouring. Although this reinforcement layer has strong stability in the lateral direction, its stability in the longitudinal direction needs to be improved. Utility Model Content

[0005] To further improve the longitudinal stability of the foundation, this application provides a photovoltaic power station foundation structure suitable for fly ash foundations.

[0006] A foundation structure for a photovoltaic power station on a fly ash foundation includes a reinforcement layer, a buffer layer, and a concrete layer arranged sequentially from bottom to top inside the foundation pit. Side retaining bars are provided on the sidewall of the foundation pit at the depth of the reinforcement layer. An extension baffle is provided on the outer sidewall of the bottom of the side retaining bars. An extension groove is provided circumferentially at the bottom of the foundation pit, and the extension baffle extends into the extension groove.

[0007] By adopting the above technical solution, the foundation structure can significantly improve longitudinal stability. Specifically, the side retaining bars and their extended baffles on the pit sidewalls extend into the extension trench at the bottom of the pit, effectively preventing the collapse of the pit sidewalls and bottom, and improving the stability of the entire foundation structure. This unique design not only enhances the longitudinal compressive and deformation resistance of the reinforcement layer, but also provides a more reliable support foundation for subsequent construction. The protruding design at the bottom of the reinforcement layer increases the contact area with the natural soil layer, further improving the longitudinal stability of the foundation.

[0008] Preferably, a ground pile is provided inside the reinforcement layer, and an installation cone is provided at the bottom of the ground pile, with the bottom of the ground pile extending out of the reinforcement layer.

[0009] By adopting the above technical solution, the piles installed inside the reinforcement layer can significantly improve the lateral stability of the foundation. The installation cone at the bottom of the piles facilitates rapid installation by pushing the piles downward through the soil layer, and the piles, after extending out of the reinforcement layer, are inserted into the natural soil layer, further enhancing the overall stability of the foundation, reducing uneven settlement of the foundation, and improving seismic resistance.

[0010] Preferably, the maximum diameter of the mounting cone is greater than the diameter of the ground pile.

[0011] By adopting the above technical solution, the design of having a maximum diameter of the installation cone larger than that of the pile ensures greater stability when the installation cone is inserted into the soil. After the installation cone breaks through the soil layer and completes its installation, the soil layer can be compacted again, thereby using the natural soil layer to fill the gaps on the sides of the pile and further improving the longitudinal stability of the foundation.

[0012] Preferably, the mounting cone is a hollow cone and an mounting sleeve is provided inside the mounting cone, and the bottom of the ground pile is threadedly connected to the mounting sleeve.

[0013] By adopting the above technical solution, the mounting cone is a hollow cone with an internal mounting sleeve, and the bottom of the pile is threadedly connected to the mounting sleeve. This not only improves the convenience of transportation but also enhances the connection strength between the pile and the reinforcement layer. Specifically, the hollow cone design allows the mounting sleeves to be stacked during transportation, and the piles can be stacked parallel, reducing transportation space and costs. At the same time, the threaded connection simplifies the installation operation of the piles, ensuring their stability after insertion into the natural soil layer, thereby further improving the overall stability and bearing capacity of the foundation.

[0014] Preferably, the top of the ground pile has a mounting cap.

[0015] By adopting the above technical solution, the installation cap can improve the structural strength of the top of the ground pile. When the ground pile is buried, the installation cap can be struck to promote the installation of the ground pile. Therefore, the installation cap helps to maintain the structural stability of the top of the ground pile.

[0016] Preferably, the pile is hollow inside and has seepage holes through its sidewalls, and the mounting cap has a grouting port.

[0017] By adopting the above technical solution, the pile is hollow inside and has seepage holes running through its sidewalls, and the cap has a grouting port. When pouring the reinforcement layer, concrete can be injected into the pile through the grouting port, and then the concrete seeps out from several seepage holes and finally fills the reinforcement layer, thus completing the reinforcement layer pouring construction. This makes the connection strength between the pile and the reinforcement layer higher, improving the overall stability and bearing capacity of the foundation.

[0018] Preferably, the buffer layer is a layer structure consisting of a mixture of gravel and fly ash.

[0019] By adopting the above technical solution, the structure of the buffer layer using a mixture of gravel and fly ash can better fill the gaps between the gravel, reduce the compressibility of the buffer layer, provide a more uniform support surface, and effectively reduce uneven settlement of the foundation.

[0020] Preferably, a steel mesh is provided inside the side retaining rib, and the steel mesh is located inside the reinforcement layer.

[0021] By adopting the above technical solution, a steel mesh is installed inside the side retaining bars, and the steel mesh is located inside the reinforcement layer. This not only enhances the structural strength of the side retaining bars, but also further improves the bearing capacity and stability of the entire reinforcement layer, reduces the risk of foundation settlement, and enhances the overall performance and seismic resistance of the foundation.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By setting side retaining bars and extended baffles on the sidewalls of the foundation pit, and setting extended grooves along the circumferential direction at the bottom of the foundation pit, the collapse of the sidewalls and bottom of the foundation pit is effectively prevented, and the longitudinal stability of the foundation is improved.

[0024] 2. The ground piles and their mounting cone structures installed inside the reinforcement layer not only enhance the lateral stability of the foundation, but also further improve the overall bearing capacity and compressive strength of the foundation.

[0025] 3. The buffer layer adopts a layer structure of mixed gravel and fly ash, which reduces the compressibility of the buffer layer, provides a more uniform support surface, and helps to reduce uneven settlement of the foundation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0027] Figure 2 This is a structural schematic diagram illustrating the connection relationship between the side retaining bars and the steel mesh after the reinforcement layer is hidden in an embodiment of this application.

[0028] Figure 3 This is a structural schematic diagram used in the embodiments of this application to illustrate the connection relationship between the ground pile and the installation cone;

[0029] Figure 4 This is a structural diagram illustrating the connection between the ground pile and the mounting cap in an embodiment of this application.

[0030] In the picture:

[0031] 1. Excavation pit; 11. Reinforcement layer; 12. Buffer layer; 13. Concrete layer;

[0032] 2. Side reinforcing bars; 21. Steel mesh frame; 22. Extension baffle; 23. Extension groove;

[0033] 3. Ground pile; 31. Installation cone; 32. Installation sleeve; 33. Installation cap; 34. Exudation hole; 35. Grouting port. Detailed Implementation

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of the present invention and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of the present invention without creative effort, and these embodiments are also within the protection scope of the present invention.

[0035] The inventors of this application discovered that the foundation structure lacks longitudinal stability. Therefore, this application mainly adopts the following photovoltaic power station foundation structure suitable for fly ash foundations, which achieves the purpose of improving the longitudinal stability of the foundation by adding side retaining bars and extending baffles.

[0036] The following is a further detailed description of this application.

[0037] Reference Figure 1 The photovoltaic power station foundation structure suitable for fly ash foundations provided in this application includes a reinforcement layer 11, a buffer layer 12, and a concrete layer 13 arranged sequentially from bottom to top inside the foundation pit 1. Side retaining bars 2 are provided on the sidewall of the foundation pit 1 at the depth of the reinforcement layer 11. The side retaining bars 2 can be made of high-strength steel wire, carbon fiber composite materials, etc., which can provide higher strength while maintaining lightweight design. The side retaining bars 2 are closely fitted to the sidewall of the foundation pit 1, and their installation position should be close to the sidewall of the foundation pit 1 to maximize their enclosure function. For example, to ensure the stability of the side retaining bars 2, a set of anchors can be installed at the top and bottom of the side retaining bars 2 to firmly fix them to the sidewall of the foundation pit 1. The anchors can be pre-embedded expansion bolts or chemical anchoring agents, which can provide reliable fixing effects under various geological conditions.

[0038] Reference Figure 2 The side retaining ribs 2 are cylindrical structures with an internal steel mesh 21. The steel mesh 21 is located inside the reinforcement layer 11. The main function of the steel mesh 21 is to improve the overall load-bearing capacity and crack resistance of the reinforcement layer 11. The steel mesh 21 can be arranged in single or double layers, with a mesh spacing of 100-200mm between each layer. The steel mesh 21 should be made of high-strength steel bars with a yield strength not less than 400MPa. The steel mesh 21 can significantly improve the stiffness and compressive strength of the side retaining ribs 2. The steel mesh 21 and the main body of the side retaining ribs 2 can be fixed together by welding, bolting, or wire binding to ensure their stability.

[0039] Reference Figure 2 An extension groove 23 is provided circumferentially at the bottom of the foundation pit 1, and an extension baffle 22 is provided on the outer wall of the bottom of the side retaining ribs 2. The extension baffle 22 is made of steel plate and has good wear resistance and corrosion resistance. The thickness of the steel plate can be selected according to actual needs, and it is generally recommended to use 8-12mm thick steel plate to ensure sufficient strength and durability. The extension baffle 22 extends into the extension groove 23. This design can effectively improve the longitudinal stability of the foundation, prevent the collapse of the side walls and bottom of the foundation pit 1, and ensure the overall performance of the foundation. The connection between the extension baffle 22 and the side retaining ribs 2 can be achieved by welding, bolting, or embedded connection, etc., depending on the actual conditions and technical requirements of the construction site.

[0040] The fit between the side retaining rib 2 and the extension baffle 22 is also crucial. The extension baffle 22 is designed to protect the top of the extension groove 23 and prevent it from collapsing. Therefore, the length of the extension baffle 22 should be sufficient to cover the entire perimeter of the bottom of the pit 1, and its width should be slightly larger than the width of the extension groove 23 to ensure complete insertion into the extension groove 23. The connection point between the extension baffle 22 and the side retaining rib 2 should be as close as possible to the bottom of the pit 1 to reduce stress concentration in the horizontal direction.

[0041] Reference Figure 1 The reinforcement layer 11 contains ground piles 3, the bottom of which extends out of the reinforcement layer 11 and into the natural soil layer. The function of the ground piles 3 is to further improve the lateral bearing capacity and stability of the foundation. The ground piles 3 can be of different types, such as precast reinforced concrete piles, steel pipe piles, or prestressed concrete pipe piles, each with its own unique advantages and disadvantages. For example, precast reinforced concrete piles have lower costs but longer construction periods; steel pipe piles have faster construction speeds but higher costs; prestressed concrete pipe piles combine the advantages of both and are suitable for large-scale applications.

[0042] Reference Figure 3The bottom of the ground pile 3 is provided with an installation cone 31, with the tip of the installation cone 31 facing downwards. The maximum diameter of the installation cone 31 is larger than the diameter of the ground pile 3, which helps the ground pile 3 to penetrate the soil layer more easily during installation. The installation cone 31 can be in the form of a solid cone or a hollow cone. The former is more suitable for hard soil, while the latter is more suitable for soft soil layers. Regardless of the form, the surface of the installation cone 31 should be smooth and burr-free to reduce frictional resistance and improve installation efficiency.

[0043] In this embodiment, the mounting cone 31 is a hollow cone, and a mounting sleeve 32 is fixedly welded inside the mounting cone 31. The ground pile 3 and the mounting sleeve 32 can be connected by thread, welding, or snap-fit, depending on the on-site construction conditions and technical requirements. During transportation, the mounting sleeves 32 can be stacked sequentially, and the ground piles 3 can also be stacked and placed parallel to each other, improving the convenience of transportation.

[0044] Reference Figure 4 The top of the ground pile 3 is equipped with a mounting cap 33, which is usually made of metal materials such as cast iron or steel. These materials have high hardness and toughness, can withstand greater impact forces, and serve to protect the head of the ground pile 3 and facilitate installation. The shape of the mounting cap 33 can be circular, square, or polygonal, depending on the cross-sectional shape of the ground pile 3. The mounting cap 33 can be connected to the ground pile 3 by means of threaded connection, welding, or riveting to ensure its firmness and reliability.

[0045] Furthermore, the pile 3 is hollow inside with seepage holes 34 penetrating its sidewalls, and correspondingly, a grouting port 35 is penetrating the center of the cap 33. This design aims to improve the connection strength between the pile 3 and the reinforcement layer 11. During the pouring of the reinforcement layer 11, concrete can be injected into the pile 3 through the grouting port 35 and then evenly distributed into the soil surrounding the pile 3 through the seepage holes 34, thus forming a dense reinforcement area. The diameter and spacing of the seepage holes 34 should be designed reasonably according to the actual situation; generally, a diameter of 10-20 mm and a spacing of 100-200 mm are recommended. The grouting port 35 should be designed for easy operation by construction personnel and preferably equipped with a leak-proof device to prevent concrete leakage.

[0046] Buffer layer 12 is a layer structure composed of a mixture of gravel and fly ash. This mixture has excellent permeability and air permeability, effectively improving the drainage conditions of the foundation and reducing the risk of settlement caused by moisture accumulation. The gravel should be selected in accordance with national standards, with a particle size preferably controlled within the range of 5-20mm to ensure good gradation characteristics. The fly ash content should be between 10% and 30%; too much will affect the mechanical properties of buffer layer 12, while too little will not fully realize its filling effect. The laying thickness of buffer layer 12 is generally 100-200mm, and the specific value should be determined according to the project requirements.

[0047] The implementation principle of this embodiment is as follows: by setting side retaining bars 2 on the sidewalls of the foundation pit 1 and extending baffles 22 at the bottom of the foundation pit 1, the longitudinal stability problem of the traditional square foundation pit 1 is effectively solved. The side retaining bars 2 and extending baffles 22 together constitute a three-dimensional protection system, which not only prevents the collapse of the sidewalls of the foundation pit 1, but also protects the structural integrity of the bottom of the foundation pit 1. At the same time, by setting ground piles 3 and installing cones 31 inside the reinforcement layer 11, the bearing capacity and stability of the foundation are further improved. In addition, the grouting design in the ground piles 3 makes the connection between the ground piles 3 and the reinforcement layer 11 tighter, enhancing the rigidity and seismic resistance of the overall structure. The optimized design of the buffer layer 12 also greatly reduces the uneven settlement of the foundation and improves the overall performance of the foundation. In summary, this embodiment provides an economical, efficient, safe and reliable foundation structure solution, which is particularly suitable for the construction of photovoltaic power stations on fly ash foundations.

[0048] Furthermore, during actual construction, the ground piles 3 can also be installed at an angle to further improve the overall stability of the foundation. Specifically, the angle of the inclined ground piles 3 is generally 15°-30°, and the length and diameter should be selected according to actual needs. The installation method of the inclined ground piles 3 is similar to that of the upright ground piles 3, which is also to drive them deep into the foundation through drilling or a pile driver. The difference is that the installation direction of the inclined ground piles 3 is at a certain angle, which helps to distribute the load on the foundation, reduce local pressure, and improve the overall stability of the foundation. The number and spacing of the inclined ground piles 3 should be reasonably designed according to the project requirements. It is generally recommended to install one inclined ground pile 3 approximately every 1.5 meters to ensure their uniform distribution.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A photovoltaic power station foundation structure suitable for fly ash foundation, comprising a reinforcing layer (11), a buffer layer (12) and a concrete layer (13) arranged in turn from bottom to top inside a foundation pit (1), characterized in that: The side wall of the foundation pit (1) at the depth of the reinforcing layer (11) is provided with a side retaining rib (2), the outer side wall of the bottom of the side retaining rib (2) is provided with an extension baffle (22), the bottom of the foundation pit (1) is provided with an extension groove (23) in the circumferential direction, and the extension baffle (22) extends into the inside of the extension groove (23).

2. The photovoltaic plant foundation structure suitable for fly ash foundation according to claim 1, characterized in that: The inside of the reinforcing layer (11) is provided with a ground pile (3), the bottom of the ground pile (3) is provided with a mounting cone (31), and the bottom of the ground pile (3) extends out of the reinforcing layer (11).

3. The photovoltaic plant foundation structure suitable for fly ash foundation according to claim 2, characterized in that: The maximum diameter of the mounting cone (31) is greater than the diameter of the ground pile (3).

4. The photovoltaic plant foundation structure suitable for fly ash foundation according to claim 3, characterized in that: The mounting cone (31) is a hollow cone, and the inside of the mounting cone (31) is provided with a mounting sleeve (32), and the bottom of the ground pile (3) is threadedly connected with the mounting sleeve (32).

5. The photovoltaic power plant foundation structure suitable for fly ash foundation according to claim 2, characterized in that: The top of the ground pile (3) is provided with a mounting cap (33).

6. The photovoltaic plant foundation structure suitable for fly ash foundation according to claim 5, characterized in that: The inside of the ground pile (3) is hollow, and the side wall is provided with a seepage hole (34) penetrating through, and the mounting cap (33) is provided with a grouting port (35).

7. The photovoltaic power plant foundation structure suitable for fly ash foundation according to claim 1, characterized in that: The inside of the side retaining rib (2) is provided with a steel mesh frame (21), and the steel mesh frame (21) is located in the inside of the reinforcing layer (11).

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