Integrated tidal flat photovoltaic power station support foundation structure and construction method

Abstract

This invention discloses an integrated tidal flat photovoltaic power station support foundation structure and its construction method, comprising a root pile foundation and a support structure. The main beam of the support structure is installed on top of a pair of columns and reinforced by diagonal bracing. A gap is left between the pair of columns, and the sleeve and collar are installed in the gap, with the sleeve on top and the collar on the bottom. The sleeve sidewall has multiple insertion holes arranged sequentially from top to bottom. The root pile foundation includes, from top to bottom, a pile top, a bamboo-shaped main pile, and a cross plate at the pile bottom. A tubular auxiliary pile is installed outside the bamboo-shaped main pile. The sleeve and collar of the support structure are respectively installed on the pile top and the bamboo-shaped main pile. The pile top has a corresponding waist-shaped hole, which is fixed to the sleeve by pins. This invention is simple to construct, requires less labor, and has strong structural durability. It is suitable for coastal intertidal tidal flat areas with poor foundation bearing capacity, strong environmental corrosivity, large tidal fluctuations, and significant extreme wind loads.

Description

Technical Field

[0001] This invention relates to the field of civil engineering, specifically to the integrated support foundation structure and construction method of a tidal flat photovoltaic power station. Background Technology

[0002] Renewable energy power generation is a crucial component of the energy supply system and has become a major strategic initiative for global energy transition and achieving climate change mitigation goals. Except for barren mountains and deserts lacking development value, most photovoltaic (PV) power plants must be developed using agricultural PV models. However, tidal flats present challenges due to their weak foundation bearing capacity and highly corrosive environment. Furthermore, construction on tidal flats is affected by tidal fluctuations, making construction difficult and resulting in high costs for customized foundations and construction. Traditional tidal flat PV power plant foundations often employ deep foundations such as precast reinforced concrete piles or prestressed pipe piles. These foundation types suffer from long construction cycles, high construction difficulty, and susceptibility to the intertidal environment, significantly impacting economic efficiency and construction convenience. This hinders the rapid development of PV construction in tidal flats, necessitating the research and development of new foundation types for tidal flat PV power plants to support the efficient development of future tidal flat PV power plants for the company.

[0003] Chinese patent CN201710891609.6 discloses a construction method for a tidal flat photovoltaic power station, including: 1) leveling the tidal flat area into sections; 2) determining the required length of the support foundation for each section based on the elevation difference between the leveled sections and the design flood level; and 3) drilling holes in each leveled section and then inserting steel sections into the holes to cast the support foundation in place for each section. This method uses cast-in-place foundations for construction, resulting in a long construction period, which is difficult to meet the schedule requirements of tidal flat photovoltaic power stations.

[0004] Chinese patent CN201320530175.4 provides a photovoltaic support foundation structure suitable for tidal flat photovoltaic power stations. It includes a foundation on the ground, on which the photovoltaic support is set. The photovoltaic support includes a front column and a rear column, which are set on different foundations. This structure has a small distance between the photovoltaic support and the ground, and is suitable for non-seawater flooded areas. However, the tidal range of intertidal flats is about 3 to 5 meters, and the distance between the photovoltaic panels and the support and the ground needs to be more than 5 meters. Therefore, this structure cannot meet the construction requirements of photovoltaic power stations on intertidal flats.

[0005] Chinese patent CN201720936196.4 discloses a support structure suitable for photovoltaic panels on coastal mudflats, including a photovoltaic panel for energy storage; two support columns connected by rollers and a track groove; a vacuum-sealed pontoon fixed to support column A; a spring fixed to the base of support column A; and support column B inserted into the mudflat. The photovoltaic panel, pontoon, support columns, track groove, rollers, springs, baffles, and support columns are all coated with an anti-corrosion coating. While this structure is novel and ingeniously designed, prolonged immersion in seawater can easily cause the pulleys to jam, leading to damage to the photovoltaic panel from seawater submersion.

[0006] As mentioned above, existing design schemes for the support foundations of photovoltaic power stations in coastal mudflats have significant limitations, especially in addressing the issue of seawater inundation during high tide. Therefore, researching support foundation structures and construction methods suitable for photovoltaic power station construction in coastal mudflat areas is of great significance. Summary of the Invention

[0007] The purpose of this invention is to provide an integrated support foundation structure for tidal flat photovoltaic power stations and its construction method, so as to solve the above-mentioned defects caused by the prior art.

[0008] The integrated tidal flat photovoltaic power station support foundation structure includes a root pile foundation and a support structure. The root pile foundation is inserted into the tidal flat foundation, the support structure is fixed on the root pile foundation, and the photovoltaic panels are installed on the support structure.

[0009] The support structure includes a main beam, diagonal braces, columns, sleeves, collars, and pins. The main beam is installed on top of a pair of columns and reinforced by diagonal braces; a gap is left between the pair of columns, and the sleeves and collars are installed in the gap, with the sleeves on top and the collars on the bottom; the side wall of the sleeve is provided with multiple insertion holes from top to bottom;

[0010] The root pile foundation consists of, from top to bottom, a pile top, a bamboo-shaped main pile, and a cross plate at the pile bottom; a tubular secondary pile is installed outside the bamboo-shaped main pile.

[0011] The sleeve and collar of the support section are respectively installed on the top of the pile and the bamboo-shaped main pile. The top of the pile has a corresponding waist-shaped hole, which is fixed to the sleeve by a pin. The height between the support section and the tree root pile foundation section can be adjusted by the position of the sleeve and the insertion holes of different heights on the sleeve.

[0012] The sleeve has an inverted cylindrical structure, and its inner diameter is the same as the outer diameter of the pile top. The diameter of the insertion hole on the sleeve is the same as the diameter of the pin.

[0013] The oblong holes on the top of the pile are distributed horizontally, with the shorter side length in the vertical direction being the same as the pin diameter, and the longer side length in the horizontal direction being greater than the pin diameter. This allows for fine-tuning in the horizontal angle to ensure that the photovoltaic support structure is aligned.

[0014] Each pair of columns has a longitudinal groove on its inner side. The groove has an arc-shaped cross-section and a length greater than the height of the sleeve. The sidewall of the sleeve is installed in the groove and can slide up and down along the groove within a small range.

[0015] The bamboo-shaped main pile is a hollow tubular structure with an annular protrusion at intervals on the outer wall. The inside of the bamboo-shaped main pile is equipped with horizontal and vertical reinforcing meshes, and the top of the reinforcing meshes is connected to the top of the pile.

[0016] The aforementioned cross-shaped plate consists of two plates intersecting in a cross shape. The upper part of each plate is rectangular, and the lower part is a trapezoid that is wider at the top and narrower at the bottom. It is used for precise positioning and directional control of the tree root pile foundation, while also making it easier for the tree root pile foundation to penetrate into the tidal flat foundation.

[0017] The tubular auxiliary piles are installed at the junction of the bamboo-shaped main pile and the ground. Several tubular auxiliary piles are evenly arranged around the bamboo-shaped main pile and at a certain angle α with the main pile. The angle and number of auxiliary piles can be adjusted according to the bearing capacity requirements and material strength.

[0018] The sleeve and collar of the support structure are respectively installed on the top of the root pile foundation and the bamboo-shaped main pile, and are fixed with pins. The sleeve and collar work together to bear the force, so that the support structure is firmly connected to the root pile foundation. The pins are used to prevent the support structure from being pulled off the root pile foundation when subjected to reverse wind loads.

[0019] Preferably, the height of the support structure and the root pile foundation can be adjusted via a circular hole on the sleeve, and the height and angle can be finely adjusted via a groove on the column and an elongated hole at the top of the pile. The support structure is made of corrosion-resistant materials such as carbon fiber, fiber-reinforced organic composite materials, and aluminum alloy.

[0020] The sleeve is made of corrosion-resistant materials such as carbon fiber, fiber-reinforced organic composite materials, and aluminum alloy.

[0021] Preferably, the collar is welded to the column, and its inner diameter is the same as the outer diameter of the pile body of the tree root pile foundation. It can be tightly fixed to the bamboo-shaped main pile. The collar is made of corrosion-resistant materials such as stainless steel and aluminum alloy.

[0022] Preferably, one end of the pin is enlarged into a nail head, and the other end of the pin head has a built-in metal spring. After the pin passes through the sleeve and the top of the pile, the metal spring at the nail head end springs open, so that the sleeve and the top of the pile are firmly connected.

[0023] Preferably, the bearing capacity of the root pile foundation can be calculated according to the following formula:

[0024] Vertical bearing capacity:

[0025]

[0026] In the formula: Vertical bearing capacity of tree root piles; Vertical bearing capacity of the main pile; This refers to the vertical bearing capacity of the secondary piles; This refers to the horizontal bearing capacity of the auxiliary piles; The angle between the main pile and the secondary pile.

[0027] When the horizontal load direction is parallel to one of the auxiliary piles, the horizontal bearing capacity is:

[0028]

[0029] In the formula: The horizontal bearing capacity of the tree root pile; The horizontal bearing capacity of the main pile; Represents the vertical bearing capacity of the secondary pile; This refers to the horizontal bearing capacity of the auxiliary piles; This refers to the pull-out bearing capacity of the secondary piles; The angle between the main pile and the secondary pile; Let be the angle between the i-th auxiliary pile on the plane and the horizontal load.

[0030] When the direction of the horizontal load is parallel to the bisectors of two of the auxiliary piles, the horizontal bearing capacity is:

[0031]

[0032] In the formula: The horizontal bearing capacity of the tree root pile; The horizontal bearing capacity of the main pile; Represents the vertical bearing capacity of the secondary pile; This refers to the horizontal bearing capacity of the auxiliary piles; This refers to the pull-out bearing capacity of the secondary piles; The angle between the main pile and the secondary pile; Let be the angle between the i-th auxiliary pile on the plane and the horizontal load.

[0033] Pull-out bearing capacity:

[0034]

[0035] In the formula: For the uplift bearing capacity of tree root piles; The pull-out bearing capacity of the main pile; This refers to the pull-out bearing capacity of the secondary piles; This refers to the horizontal bearing capacity of the auxiliary piles; The angle between the main pile and the secondary pile.

[0036] Preferably, the construction method for the integrated tidal flat photovoltaic power station support foundation structure is characterized by including the following steps:

[0037] S1. Material arrival: The precast root pile foundation will be transported by land or sea to the storage area near the photovoltaic power station and stacked according to the construction sequence and specifications of the piles.

[0038] S2. Measurement and layout: Use the rectangular coordinate method to determine the main axis, and combine it with the pile location plan to measure the axis of all pile locations and mark the center point of the hole location.

[0039] S3. Static pressure root pile foundation: The root pile foundation is transported to the vicinity of the pile location and driven into the tidal flat foundation using a crawler-mounted pile driver. Before driving, positioning, direction control, and verticality control are performed, and the verticality is corrected again when the pile is driven 1m in. Piles that do not meet the requirements are pulled out and re-driven.

[0040] S4. Frame construction: After the tree root pile foundation is completed, install the frame and photovoltaic modules. Put the frame sleeve and collar onto the top of the tree root pile foundation, lift the frame and correct its position and direction, and insert the pin to complete the frame installation.

[0041] The advantages of this invention are: the integrated tidal flat photovoltaic power station support foundation structure:

[0042] (1) The structure is lightweight, strong, and has high friction with the foundation, making it suitable for tidal flat foundations with extremely low bearing capacity;

[0043] (2) The structure is simple and easy to install. No bolt connection or reinforcement is required, which can reduce the amount of on-site construction work, especially the amount of manual work, thereby greatly speeding up the construction progress.

[0044] (3) During the installation process, the height and angle of the structure can be finely adjusted, which improves the accuracy of the structure installation. Attached Figure Description

[0045] Figure 1 A three-dimensional diagram of the support foundation for an integrated tidal flat photovoltaic power station;

[0046] Figure 2 This is a 3D view of the support structure.

[0047] Figure 3 This is a cross-sectional view of the support structure.

[0048] Figure 4 A three-dimensional view of the tree root pile foundation;

[0049] Figure 5 This is a cross-sectional view of the tree root pile foundation.

[0050] Figure 6 This is a schematic diagram of the groove in the support section;

[0051] Figure 7 A 3D diagram of the pin;

[0052] Figure 8 This is a schematic diagram of the installation of the present invention. Detailed Implementation

[0053] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0054] like Figure 1 As shown, the integrated tidal flat photovoltaic power station support foundation structure includes a root pile foundation part 2 and a support part 1. The root pile foundation part 2 is inserted into the tidal flat foundation, and the support part 1 is fixed on the root pile foundation part 2. The photovoltaic panels are installed on the support. The support part 1 includes a main beam 3, diagonal braces 4, columns 5, sleeves 6, collars 7, and pins 8. The root pile foundation part 2 includes a pile top 9 and a bamboo-shaped main pile 10.

[0055] like Figure 2 As shown, the three-dimensional view of the support section 1 includes a main beam 3, diagonal braces 4, columns 5, sleeves 6, collars 7, and pins 8. The main beam 3, diagonal braces 4, and columns 5 constitute the load-bearing structure of the support section 1, and are fixed by bolts or welded, forming a prefabricated structure.

[0056] like Figure 3 As shown in the cross-sectional view of the support section 1, the sleeve 6 is an inverted cylindrical structure, embedded between two columns 5. The inner side of the column 5 is grooved, and the length of the groove is slightly greater than the height of the sleeve 6, allowing for fine adjustment of the sleeve 6 in the height direction. The inner diameter of the sleeve 6 is the same as the outer diameter of the top 9 of the root pile foundation section 2. The diameter of the through hole on the sleeve 6 is the same as the diameter of the pin 8. The sleeve 6 is made of corrosion-resistant materials such as carbon fiber, fiber-reinforced organic composite materials, and aluminum alloy. The collar 7 is welded to the column 5, and its inner diameter is the same as the outer diameter of the root pile foundation section 2, allowing for tight fixation to the bamboo-shaped main pile 10. The collar 7 is made of corrosion-resistant materials such as stainless steel and aluminum alloy.

[0057] like Figure 4 As shown in the diagram, the three-dimensional view of the root pile foundation 2 shows that the top 9 of the pile has an elongated hole. The shorter side of the elongated hole in the vertical direction is the same as the diameter of the pin 8, and the length in the horizontal direction is slightly larger than the diameter of the pin 8, allowing for fine-tuning in the horizontal angle to ensure the photovoltaic support is aligned. A cross plate 12 is welded to the bottom of the bamboo-shaped main pile 10. The upper part of the cross plate 12 is rectangular, and the lower part is a trapezoid, wider at the top and narrower at the bottom, used for precise positioning and directional control of the root pile foundation 2, while also making it easier for the root pile foundation 2 to penetrate into the tidal flat foundation.

[0058] like Figure 5The cross-sectional view of the tree root pile foundation 2 shows that the bamboo-shaped main pile 10 is a hollow tubular structure, generally made of concrete, which is inexpensive. The pile body has transverse and longitudinal reinforcing meshes inside, and the reinforcing materials can be steel bars or new fiber-reinforced organic composite materials. The top of the reinforcing mesh is welded to the pile top 9, thus making the tree root pile foundation 2 a solid whole.

[0059] like Figure 6 As shown in the schematic diagram of the groove in the bracket part 1, preferably, the inner side of the column 5 of the bracket part 1 has an arc-shaped groove, and the sleeve 6 can slide up and down along the groove on the inner side of the column 5 within a small range, so that the height of each photovoltaic bracket can be consistent.

[0060] like Figure 7 As shown in the perspective view of pin 8, the sleeve 6 and collar 7 of the support part 1 are respectively installed on the pile top 9 and pile body of the tree root pile foundation part 2, and are fixed by pin 8. Preferably, one end of the pin 8 is enlarged into a nail head, and the other end of the nail head has a built-in metal spring. After the pin 8 passes through the sleeve 6 and the pile top 9, the metal spring at the nail head end springs open, so that the sleeve 6 and the pile top 9 are firmly connected. The pin 8 is made of high-strength, easy-to-process, and corrosion-resistant materials such as stainless steel and aluminum alloy.

[0061] like Figure 8 As shown, the root pile foundation part 2 is inserted into the tidal flat foundation, the support part 1 is fixed on the root pile foundation part 2, and the photovoltaic panel is installed on the support part 1.

[0062] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. An integrated support and foundation structure for a tidal flat photovoltaic power station, characterized in that, Includes the root pile foundation (2) and the support structure (1); The support section (1) includes a main beam (3), diagonal braces (4), columns (5), sleeves (6), collars (7), and pins (8); the main beam (3) is installed on the top of a pair of columns (5) and reinforced by diagonal braces (4); a gap is left between the pair of columns (5), and the sleeves (6) and collars (7) are installed in the gap, with the sleeves (6) on top and the collars (7) on the bottom; the side wall of the sleeves (6) is provided with multiple insertion holes from top to bottom; The inner side of each pair of columns (5) is provided with a longitudinal groove. The cross-section of the groove is arc-shaped. The length of the groove is greater than the height of the sleeve (6). The side wall of the sleeve (6) is installed in the groove and can slide up and down along the groove in a small range. The root pile foundation (2) includes, from top to bottom, a pile top (9), a bamboo-shaped main pile (10), and a cross plate (12) at the pile bottom; a tubular secondary pile (11) is installed outside the bamboo-shaped main pile (10). The sleeve (6) and collar (7) of the support part (1) are respectively installed on the pile top (9) and the bamboo-shaped main pile (10). The pile top (9) has a corresponding waist-shaped hole, which is fixed to the sleeve (6) by a pin (8). The height between the support part (1) and the tree root pile foundation part (2) can be adjusted by the position of the sleeve (6) and the insertion holes of different heights on the sleeve (6).

2. The integrated tidal flat photovoltaic power station support foundation structure according to claim 1, characterized in that: The sleeve (6) is an inverted cylindrical structure, and its inner diameter is the same as the outer diameter of the pile top (9). The diameter of the insertion hole on the sleeve (6) is the same as the diameter of the pin (8). The waist-shaped holes on the top of the pile (9) are distributed horizontally. The length of the short side in the vertical direction is the same as the diameter of the pin (8), and the length in the horizontal direction is greater than the diameter of the pin (8).

3. The integrated tidal flat photovoltaic power station support foundation structure according to claim 1, characterized in that: The bamboo-shaped main pile (10) is a hollow tubular structure with an annular protrusion at intervals on the outer wall. The bamboo-shaped main pile (10) has a horizontal and vertical reinforcing mesh inside the pile body, and the top of the reinforcing mesh is connected to the pile top (9).

4. The integrated tidal flat photovoltaic power station support foundation structure according to claim 1, characterized in that: The cross plate (12) is composed of two plates intersecting in a cross shape. The upper part of each plate is rectangular and the lower part is a trapezoid that is wider at the top and narrower at the bottom.

5. The integrated tidal flat photovoltaic power station support foundation structure according to claim 1, characterized in that: The tubular secondary piles (11) are set at the junction of the bamboo-shaped main pile (10) and the ground. Several tubular secondary piles (11) are evenly arranged around the bamboo-shaped main pile (10) and at a certain angle α with the bamboo-shaped main pile (10).

6. The integrated tidal flat photovoltaic power station support foundation structure according to claim 1, characterized in that: One end of the pin (8) is enlarged into a nail head, and the other end of the nail head has a built-in metal spring. After the pin (8) passes through the sleeve (6) and the pile top (9), the metal spring at the nail head end springs open, so that the sleeve (6) and the pile top (9) are firmly connected.

7. The construction method of the integrated tidal flat photovoltaic power station support foundation structure according to any one of claims 1 to 6, characterized in that: Includes the following steps: S1. Materials arrive on site. The precast root pile foundation (2) is transported by land or sea to the storage area near the photovoltaic power station and stacked according to the construction sequence and specifications of the piles. S2. Surveying and setting out: Use the rectangular coordinate method to determine the main axis, and combine it with the pile location plan to measure the axis of all pile locations and mark the center point of the hole location; S3, Static pressure tree root pile foundation part (2), transport the tree root pile foundation part (2) to the vicinity of the pile position, and use a crawler pile driver to press it into the tidal flat foundation. Before pressing the pile, position, direction control and verticality control are carried out, and the verticality is corrected again when the pile is pressed into the ground for 1m; for piles that do not meet the requirements, pull them out and press them again. S4. Frame construction: After the pile foundation is completed, install the frame and photovoltaic modules. Put the frame sleeve (6) and collar (7) onto the top (9) of the root pile foundation part (2), lift the frame and correct its position and direction, and insert the pin (8) to complete the frame installation.

Images