High-altitude mountain photovoltaic integrated pile foundation rapid construction method

Abstract

This invention discloses a rapid construction method for integrated photovoltaic (PV) pile foundations in high-altitude mountainous areas. The method involves conducting geological surveys of the high-altitude construction area to clarify geological conditions, and determining the pile foundation location, depth, and specifications of embedded parts based on the PV power station design scheme. Using GPS positioning, precise lines are laid out based on the measurement control points transferred by the surveying and design unit, and each pile foundation location is marked. Drilling is then performed using down-the-hole drills or rotary drilling rigs, depending on the geological conditions and pile foundation location markings. The beneficial effects of this invention are: the embedded parts are prefabricated in a factory, with hot-dip galvanized steel pipes welded to the reinforcing cage, significantly reducing the pressure on forest fire prevention in high-altitude mountainous areas, improving the safety of the construction process, and avoiding quality deviations in on-site welding, ensuring the connection strength of the embedded parts; the integrated embedded part design effectively avoids the sinking and displacement problems of the hot-dip galvanized steel pipes due to their own weight during concrete pouring.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic engineering construction technology, and in particular to a rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas. It is applicable to high-altitude, complex terrain, and harsh climate conditions in mountainous photovoltaic projects, and is especially suitable for pile foundation construction of grassland-solar complementary and pasture-solar complementary high-altitude mountainous photovoltaic power generation projects. Background Technology

[0002] In the construction of photovoltaic projects in high-altitude mountainous areas, the installation of photovoltaic pile foundations and supports is a core construction step. The high altitude and low oxygen environment in these areas negatively impacts construction efficiency.

[0003] Traditional photovoltaic pile foundation embedded parts mostly adopt a split design, which requires positioning and fixing in stages during installation. In complex mountainous terrain, positioning deviations are prone to occur, leading to difficulties in subsequent support installation. Furthermore, the connection stability between the embedded parts and the pile foundation is insufficient. Affected by environmental factors such as high-altitude strong winds and freeze-thaw cycles, problems such as loosening and displacement are likely to occur, affecting the overall structural safety of the photovoltaic system.

[0004] Therefore, it is necessary to propose a rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas to address the aforementioned technical problems. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a rapid construction method for photovoltaic integrated pile foundations in high-altitude mountainous areas, which effectively reduces the impact of reduced efficiency of manual and mechanical operations in high-altitude, low-oxygen, and low-temperature environments, reduces the frequency of on-site hot work, achieves adaptive matching between construction technology and complex mountainous terrain, and improves the efficiency, accuracy, and safety of pile foundation construction.

[0006] A rapid construction method for photovoltaic integrated pile foundations in high-altitude mountainous areas, comprising the following steps: S1. Before construction, conduct a geological survey of the high-altitude mountain construction area to clarify the geological conditions and determine the location, depth and specifications of the embedded parts of the pile foundation in conjunction with the photovoltaic power station design plan. S2. Based on the measurement control points handed over by the survey and design unit, GPS positioning is used for precise layout, and marks are made at the location of each pile foundation. S3. Based on the location markings of the pile foundations and the different geological conditions, drilling operations are carried out using down-the-hole drills or rotary drilling rigs. S4. Place the integrated photovoltaic pile foundation embedded parts into the drilled holes, pour concrete, and vibrate while pouring until the concrete slurry height is flush with the existing ground.

[0007] The integrated photovoltaic pile foundation embedded component includes a galvanized steel pipe and a reinforcing cage, wherein the galvanized steel pipe and the reinforcing cage are welded together.

[0008] The reinforcing cage is made of main bars, longitudinal bars and spiral bars lapped together; the main bars and spiral bars are fixed by spot welding, the main bars are evenly distributed along the outer surface of the hot-dip galvanized steel pipe, and the main bars are welded to the lower part of the hot-dip galvanized steel pipe.

[0009] The galvanized steel pipe is a cylindrical steel structure made of high-strength steel. The length of the hot-dip galvanized steel pipe is 1.5~3m, and the outer diameter is matched with the diameter of the pile foundation hole. The specification of the hot-dip galvanized steel pipe is 168×5.5mm.

[0010] The main reinforcement is Φ12mm steel bar, and the main reinforcement is evenly distributed on the outer surface of the hot-dip galvanized steel pipe; the spiral reinforcement is Φ6mm steel bar, and the spiral reinforcement is arranged at a spacing of 100mm.

[0011] The integrated photovoltaic pile foundation embedded parts are all prefabricated components in the factory. The welding of hot-dip galvanized steel pipes and steel cages is completed in the factory, and there is no cutting, welding or hot work during on-site construction.

[0012] The measurement data mentioned in step S2 includes the plane coordinate data (X, Y) and elevation data H of the pile foundation layout point. In the plane coordinates, X is the north-south coordinate and Y is the east-west coordinate.

[0013] The terrain angles mentioned in step S3 include the east-west terrain tilt angle α and the north-south terrain tilt angle β, which are calculated using an algorithm formula. The specific calculation formula is as follows: , in The east-west elevation difference between adjacent pile foundation layout points; For the layout points of adjacent pile foundations East-west planar distance; The north-south elevation difference between adjacent pile foundation layout points; For the sake of the prime minister The north-south plane distance between adjacent pile foundation layout points.

[0014] East-west plane distance between adjacent pile foundation layout points North-South Planar Distance ; Here are the plane coordinates of the first lofting point; The plane coordinates of the second stakeout point; the east-west elevation difference. North-South Elevation Difference , The elevation of the first stakeout point. The elevation of the second stakeout point.

[0015] The selection principle for drilling rigs in step S3 is as follows: down-the-hole drilling rigs are used when the geology is mainly rock and hard soil layers, and rotary drilling rigs are used when the geology is mainly soft soil and silty clay layers and there is no thick layer of frozen soil; the borehole diameter error is ≤5mm, and the deviation between the borehole depth and the designed depth of the pile foundation is ≤10mm; after the integrated photovoltaic pile foundation embedded parts are hoisted in step S4, the deviation between the top elevation and the designed elevation is ≤5mm; the concrete pouring adopts a layered vibration method, with each layer having a vibration thickness of 200~300mm, and vibration continues until there are no air bubbles on the concrete surface and the slurry is uniform, and the position of the embedded parts is monitored in real time during the concrete pouring process to avoid displacement or tilting.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The embedded pile foundation component of the present invention is a prefabricated integrated structure in the factory. The hot-dip galvanized steel pipe and the reinforcing cage are welded together. There is no cutting, welding or other open flame operations during on-site construction, which greatly reduces the pressure of forest fire prevention in high-altitude mountainous areas, improves the safety of the construction process, and avoids the quality deviation of on-site welding, ensuring the connection strength of the embedded component. 2. The integrated embedded part design effectively avoids the sinking and displacement of hot-dip galvanized steel pipes due to their own weight during concrete pouring, ensuring the installation elevation and verticality of the embedded part, providing a good foundation for the subsequent installation of photovoltaic brackets, and solving the problem of large positioning deviation of traditional split embedded parts. 3. This invention calculates the east-west and north-south tilt angles of mountainous terrain using algorithmic formulas, enabling adaptive matching of drilling equipment, construction technology, and complex terrain, effectively improving the accuracy of pile foundation construction and adapting to the diverse angles of high-altitude mountainous terrain. 4. The construction method adopts GPS precise layout, geological-adaptive drilling, and layered vibration pouring, etc., strictly controlling the error of each construction link. The photovoltaic pile foundation has strong structural stability and can resist the harsh environmental effects of strong winds and freeze-thaw cycles in high-altitude mountains, thus improving the overall reliability of the photovoltaic system. 5. Integrated embedded parts are prefabricated in the factory and directly installed on site, which greatly reduces on-site operation procedures, effectively reduces the impact of reduced efficiency of manpower and machinery in high-altitude and low-oxygen environments, speeds up construction progress, and improves project performance efficiency. It is suitable for various high-altitude mountain photovoltaic projects such as grassland-solar complementary and pasture-solar complementary projects. Attached Figure Description

[0017] Figure 1 This is a flowchart of the rapid construction method for pile foundations of the present invention; Figure 2 This is a structural diagram of the integrated photovoltaic pile foundation embedded component of the present invention. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0019] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0020] like Figure 1 and Figure 2 As shown, a rapid construction method for photovoltaic integrated pile foundations in high-altitude mountainous areas includes the following steps: S1. Before construction, conduct a geological survey of the high-altitude mountain construction area to clarify the geological conditions and determine the location, depth and specifications of the embedded parts of the pile foundation in conjunction with the photovoltaic power station design plan. S2. Based on the measurement control points handed over by the survey and design unit, GPS positioning is used for precise layout, and marks are made at the location of each pile foundation. S3. Based on the location markings of the pile foundations and the different geological conditions, drilling operations are carried out using down-the-hole drills or rotary drilling rigs. S4. Place the integrated photovoltaic pile foundation embedded parts into the drilled holes, pour concrete, and vibrate while pouring until the concrete slurry height is flush with the existing ground.

[0021] The integrated photovoltaic pile foundation pre-embedded component includes a galvanized steel pipe 1 and a reinforcing cage 2, wherein the galvanized steel pipe 1 and the reinforcing cage 2 are welded together.

[0022] The steel cage 2 is made of main bars, longitudinal bars and spiral bars lapped together; the main bars and spiral bars are fixed by spot welding, the main bars are evenly distributed along the outer surface of the hot-dip galvanized steel pipe, and the main bars are welded to the lower part of the hot-dip galvanized steel pipe.

[0023] Galvanized steel pipe 1 is a cylindrical steel structure made of high-strength steel. The length of the hot-dip galvanized steel pipe is 1.5~3m, and the outer diameter is matched with the diameter of the pile foundation hole. The specifications of the hot-dip galvanized steel pipe are 168×5.5mm.

[0024] The main reinforcement is Φ12mm steel bar, and the main reinforcement is evenly distributed on the outer surface of the hot-dip galvanized steel pipe; the spiral reinforcement is Φ6mm steel bar, and the spiral reinforcement is arranged at a spacing of 100mm.

[0025] The integrated photovoltaic pile foundation embedded parts are all prefabricated components in the factory. The welding of hot-dip galvanized steel pipes and steel cages is completed in the factory, and there is no cutting, welding or hot work during on-site construction.

[0026] The measurement data mentioned in step S2 includes the plane coordinate data (X, Y) and elevation data H of the pile foundation layout point. In the plane coordinates, X is the north-south coordinate and Y is the east-west coordinate.

[0027] The terrain angles mentioned in step S3 include the east-west terrain tilt angle α and the north-south terrain tilt angle β, which are calculated using an algorithm formula. The specific calculation formula is as follows: , in The east-west elevation difference between adjacent pile foundation layout points; For the layout points of adjacent pile foundations East-west planar distance; The north-south elevation difference between adjacent pile foundation layout points; For the sake of the prime minister The north-south plane distance between adjacent pile foundation layout points.

[0028] East-west plane distance between adjacent pile foundation layout points North-South Planar Distance ; Here are the plane coordinates of the first lofting point; The plane coordinates of the second stakeout point; the east-west elevation difference. North-South Elevation Difference , The elevation of the first stakeout point. The elevation of the second stakeout point.

[0029] The selection principle for drilling rigs in step S3 is as follows: down-the-hole drilling rigs are used when the geology is mainly rock and hard soil layers, and rotary drilling rigs are used when the geology is mainly soft soil and silty clay layers and there is no thick layer of frozen soil; the borehole diameter error is ≤5mm, and the deviation between the borehole depth and the designed depth of the pile foundation is ≤10mm; after the integrated photovoltaic pile foundation embedded parts are hoisted in step S4, the deviation between the top elevation and the designed elevation is ≤5mm; the concrete pouring adopts a layered vibration method, with each layer having a vibration thickness of 200~300mm, and vibration continues until there are no air bubbles on the concrete surface and the slurry is uniform, and the position of the embedded parts is monitored in real time during the concrete pouring process to avoid displacement or tilting.

[0030] Compared with the prior art, the present invention has the following advantages: 1. The embedded pile foundation component of the present invention is a prefabricated integrated structure in the factory. The hot-dip galvanized steel pipe and the reinforcing cage are welded together. There is no cutting, welding or other open flame operations during on-site construction, which greatly reduces the pressure of forest fire prevention in high-altitude mountainous areas, improves the safety of the construction process, and avoids the quality deviation of on-site welding, ensuring the connection strength of the embedded component. 2. The integrated embedded part design effectively avoids the sinking and displacement of hot-dip galvanized steel pipes due to their own weight during concrete pouring, ensuring the installation elevation and verticality of the embedded part, providing a good foundation for the subsequent installation of photovoltaic brackets, and solving the problem of large positioning deviation of traditional split embedded parts. 3. This invention calculates the east-west and north-south tilt angles of mountainous terrain using algorithmic formulas, enabling adaptive matching of drilling equipment, construction technology, and complex terrain, effectively improving the accuracy of pile foundation construction and adapting to the diverse angles of high-altitude mountainous terrain. 4. The construction method adopts GPS precise layout, geological-adaptive drilling, and layered vibration pouring, etc., strictly controlling the error of each construction link. The photovoltaic pile foundation has strong structural stability and can resist the harsh environmental effects of strong winds and freeze-thaw cycles in high-altitude mountains, thus improving the overall reliability of the photovoltaic system. 5. Integrated embedded parts are prefabricated in the factory and directly installed on site, which greatly reduces on-site operation procedures, effectively reduces the impact of reduced efficiency of manpower and machinery in high-altitude and low-oxygen environments, speeds up construction progress, and improves project performance efficiency. It is suitable for various high-altitude mountain photovoltaic projects such as grassland-solar complementary and pasture-solar complementary projects.

[0031] Example 1: Taking a grassland-type mountain photovoltaic project (grassland-solar complementary) at an altitude of 3500m as the construction background, this area is a low-oxygen and low-temperature environment with irregular terrain and strict forest fire prevention requirements. The integrated photovoltaic pile foundation pre-embedded parts and rapid construction method of this invention are used for photovoltaic pile foundation construction. The specific implementation details are as follows: I. Prefabrication of Integrated Photovoltaic Pile Foundation Embedded Components In this embodiment, the integrated photovoltaic pile foundation embedded parts are all processed and welded in the factory. The hot-dip galvanized steel pipe is made of Q355 high-strength steel with a specification of 168×5.5mm and a length of 2.5m determined according to the thickness of the frozen soil in the construction area (1.2m). The main reinforcement of the steel cage is made of Φ12mm HRB400 steel bars, a total of 6 bars, which are evenly distributed along the outer surface of the hot-dip galvanized steel pipe. The spiral reinforcement is made of Φ6mm HPB300 steel bars, with a spacing of 100mm (6@100). The main reinforcement and the spiral reinforcement are fixed by spot welding. The ends of the 6 main reinforcement bars are fixed to the lower part of the hot-dip galvanized steel pipe by single-sided welding. After welding, the hot-dip galvanized steel pipe is subjected to secondary galvanizing treatment to improve corrosion resistance. After the embedded parts are prefabricated as a whole, they are transported to the construction site without any hot work.

[0032] II. Specific Implementation of Rapid Construction of Photovoltaic Integrated Pile Foundations in High-Altitude Mountainous Areas Geological survey and parameter determination: A geological survey was conducted in the construction area, which determined that the surface layer of the area is 0.5m thick grassland humus soil, the lower layer is silty clay layer, the frozen soil thickness is 1.2m, and there is no obvious rock distribution; combined with the design load of photovoltaic support, the design depth of the pile foundation is determined to be 3m, the hole diameter is 200mm, and the above-mentioned 2.5m long integrated pre-embedded parts are matched.

[0033] GPS-based precise layout and measurement data acquisition utilize high-precision GPS positioning equipment (positioning accuracy ±2mm). Pile foundation layout is conducted based on the measurement control points handed over by the design unit, with steel stakes marked at each pile foundation location. Measurement data is collected from two adjacent pile foundation layout points: the first layout point (X1=38521.25m, Y1=12689.32m, H1=3502.15m), and the second layout point (X2=38522.50m, Y2=12688.86m, H2=3502.87m).

[0034] Terrain angle calculation and drilling operations: Calculate terrain angles based on measurement data: North-South horizontal distance. North-South Elevation Difference North-south terrain slope angle East-west planar distance East-west elevation difference East-west terrain slope angle Based on the geological conditions (silty clay layer + 1.2m frozen soil), a down-the-hole drill was selected for drilling operations. The borehole diameter was controlled at 200mm, and the borehole depth was controlled at 3m, with the error in both diameter and depth ≤3mm.

[0035] For the placement of embedded parts and the vibration of concrete pouring, a small electric hoisting device was used to lift the integrated embedded parts into the pile foundation hole. The verticality was corrected by a level and the top elevation was checked by an elevation ruler to ensure that the top elevation of the embedded parts deviated from the design elevation by 3mm and that there was no tilting. C30 antifreeze concrete was poured into the hole, and a layered vibration method was used, with each layer being 250mm thick. An immersion vibrator was used to vibrate until there were no air bubbles on the concrete surface. Pouring and vibration continued until the concrete slurry height was level with the ground. Real-time monitoring was carried out during the pouring process, and the embedded parts did not shift or sink.

[0036] After the concrete for pile foundation curing was poured, the pile foundation was fully covered with insulation cotton and plastic film for curing for 15 days. After curing, the concrete strength was tested and found to reach 105% of the C30 design strength. The pile foundation construction quality met the design requirements.

[0037] This embodiment achieves rapid construction of photovoltaic pile foundations in high-altitude mountainous areas through the construction method and integrated embedded parts of the present invention. The construction time of a single pile foundation is reduced by 60% compared with the traditional method. There is no hot work on site, and the positioning deviation of the pile foundation is ≤5mm. It effectively solves various technical problems in the construction of photovoltaic pile foundations in high-altitude mountainous areas, and the construction effect is remarkable.

[0038] The present invention relates to a rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas and an integrated pile foundation embedded component. The structure is reasonably designed, and the construction process is simple and precise. It is suitable for various construction requirements in high-altitude mountainous areas, such as low oxygen, low temperature, complex terrain, and forest fire prevention. It can realize standardized prefabrication in the factory and efficient on-site construction, which greatly improves the construction efficiency and quality of photovoltaic pile foundations in high-altitude mountainous areas, reduces construction safety risks, and is applicable to the pile foundation construction of various high-altitude mountainous photovoltaic projects. It has good industrial practicality and promotion and application value.

[0039] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A rapid construction method for photovoltaic integrated pile foundations in high-altitude mountainous areas, characterized in that: The method and steps are as follows: S1. Before construction, conduct a geological survey of the high-altitude mountain construction area to clarify the geological conditions and determine the location, depth and specifications of the embedded parts of the pile foundation in conjunction with the photovoltaic power station design plan. S2. Based on the measurement control points handed over by the survey and design unit, GPS positioning is used for precise layout, and marks are made at the location of each pile foundation. S3. Based on the location markings of the pile foundations and the different geological conditions, drilling operations are carried out using down-the-hole drills or rotary drilling rigs. S4. Place the integrated photovoltaic pile foundation embedded parts into the drilled holes, pour concrete, and vibrate while pouring until the concrete slurry height is flush with the existing ground.

2. The rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas as described in claim 1, characterized in that: The integrated photovoltaic pile foundation embedded component includes a galvanized steel pipe and a reinforcing cage, wherein the galvanized steel pipe and the reinforcing cage are welded together.

3. The rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas as described in claim 1, characterized in that: The reinforcing cage is made of main bars, longitudinal bars and spiral bars lapped together; the main bars and spiral bars are fixed by spot welding, the main bars are evenly distributed along the outer surface of the hot-dip galvanized steel pipe, and the main bars are welded to the lower part of the hot-dip galvanized steel pipe.

4. The rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas as described in claim 1, characterized in that: The hot-dip galvanized steel pipe is a cylindrical steel structure made of high-strength steel. The length of the hot-dip galvanized steel pipe is 1.5~3m, and the outer diameter is matched with the diameter of the pile foundation hole. The specification of the hot-dip galvanized steel pipe is 168×5.5mm.

5. The rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas as described in claim 1, characterized in that: The main reinforcement is Φ12mm steel bar, and the main reinforcement is evenly distributed on the outer surface of the hot-dip galvanized steel pipe; the spiral reinforcement is Φ6mm steel bar, and the spiral reinforcement is arranged at a spacing of 100mm.

6. The rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas as described in claim 1, characterized in that: The integrated photovoltaic pile foundation embedded parts are all prefabricated components in the factory. The welding of hot-dip galvanized steel pipes and steel cages is completed in the factory, and there is no cutting, welding or hot work during on-site construction.

7. The rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas as described in claim 1, characterized in that: The measurement data mentioned in step S2 includes the plane coordinate data (X, Y) and elevation data H of the pile foundation layout point. In the plane coordinates, X is the north-south coordinate and Y is the east-west coordinate.

8. The rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas as described in claim 1, characterized in that: The terrain angles mentioned in step S3 include the east-west terrain tilt angle α and the north-south terrain tilt angle β, which are calculated using an algorithm formula. The specific calculation formula is as follows: ， in The east-west elevation difference between adjacent pile foundation layout points; For the layout points of adjacent pile foundations East-west planar distance; The north-south elevation difference between adjacent pile foundation layout points; For the sake of the prime minister The north-south plane distance between adjacent pile foundation layout points.

9. The rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas as described in claim 1, characterized in that: East-west plane distance between adjacent pile foundation layout points North-South Planar Distance ; Here are the plane coordinates of the first lofting point; The plane coordinates of the second stakeout point; the east-west elevation difference. North-South Elevation Difference , The elevation of the first stakeout point. The elevation of the second stakeout point.

10. The rapid construction method for integrated photovoltaic pile foundations in high-altitude mountainous areas as described in claim 1, characterized in that: The selection principle for drilling rigs in step S3 is as follows: down-the-hole drilling rigs are used when the geology is mainly rock and hard soil layers, and rotary drilling rigs are used when the geology is mainly soft soil and silty clay layers and there is no thick layer of frozen soil; the borehole diameter error is ≤5mm, and the deviation between the borehole depth and the designed depth of the pile foundation is ≤10mm; after the integrated photovoltaic pile foundation embedded parts are hoisted in step S4, the deviation between the top elevation and the designed elevation is ≤5mm; the concrete pouring adopts a layered vibration method, with each layer having a vibration thickness of 200~300mm, and vibration continues until there are no air bubbles on the concrete surface and the slurry is uniform, and the position of the embedded parts is monitored in real time during the concrete pouring process to avoid displacement or tilting.

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