A construction method for photovoltaic support foundation

Abstract

The present invention discloses a construction method for a photovoltaic support foundation, which includes the following steps: S1, laying out and positioning; S2, drilling; S3, cleaning holes; S4, making a steel cage: the steel cage includes a first hoop cage and a second hoop cage, the second hoop cage is set on the top of the first hoop cage and fixed, the first hoop cage and the second hoop cage are formed with installation openings on the top, and the embedded steel pipe is vertically installed in the installation opening; S5, steel cage installation: the steel cage is placed in the drilled hole; S6, concrete pouring. The present invention can effectively reduce the risk of settlement caused by uneven foundation through the fine construction of drilling, cleaning holes, making, installing steel cages and pouring concrete. At the same time, through the joint action of the steel cage and the concrete pile foundation, the weight of the photovoltaic support and its components can be effectively dispersed into the foundation, while resisting the influence of external loads such as wind and snow loads, ensuring the safe and stable operation of the photovoltaic power station.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic power generation, and in particular to a construction method for a photovoltaic support foundation. Background Art

[0002] Solar energy is a clean and renewable energy source with abundant reserves. Solar photovoltaic power generation has fewer restrictions, is simple to develop, and has a pollution-free power generation process with little impact on the environment. The development of photovoltaic power generation is not only conducive to promoting the revolution in energy production and consumption, but also conducive to building a clean, low-carbon, safe and efficient energy system, which meets the development requirements of modern low-carbon economy and green economy.

[0003] When setting up a photovoltaic power station, an on-site survey should be conducted to comprehensively analyze the distribution relationship of the layers of the foundation, the bearing capacity characteristics, the compression deformation characteristics and other factors of the rock and soil layers, and consider the design of the photovoltaic support foundation in combination with the building load characteristics. If the photovoltaic power station site is wide and the granite weathering on the site is uneven, it may lead to differences in the bearing capacity of the foundation. This unevenness may cause the photovoltaic support to become unstable during the installation process, thereby affecting the structural safety of the entire photovoltaic power station. Therefore, the uneven foundation should be considered during the construction of the photovoltaic support foundation. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method for a photovoltaic support foundation to solve the problems mentioned in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides a construction method of a photovoltaic support foundation, which comprises the following steps:

[0006] S1. Laying out and positioning: Determine the specific installation location of the photovoltaic bracket and its components;

[0007] S2. Drilling: Use a drilling machine to drill holes according to the designed hole diameter, depth and verticality;

[0008] S3. Hole cleaning: Use hole cleaning equipment to clean the soil, gravel, etc. in the hole to ensure that the hole wall is smooth and free of debris;

[0009] S4, manufacturing a steel cage: the steel cage includes a first hoop cage and a second hoop cage, the second hoop cage is sleeved on the top of the first hoop cage and fixed, the tops of the first hoop cage and the second hoop cage are formed with installation openings, and the embedded steel pipes are vertically installed in the installation openings;

[0010] S5. Installation of steel cage: Place the steel cage into the drilled hole and ensure that the position of the steel cage is correct and the verticality meets the requirements;

[0011] S6. Concrete pouring: Use a delivery pump or manual method to deliver the mixed concrete to the drill hole, and use a vibrator to vibrate the concrete to ensure that the concrete is dense and has no voids to form a pile foundation.

[0012] Furthermore, the first stirrups include a plurality of longitudinal stirrups and a plurality of transverse stirrups, the plurality of longitudinal stirrups are arranged in a ring-shaped manner, and the plurality of transverse stirrups are arranged in a longitudinal manner, and are used to tie the plurality of longitudinal stirrups to form the first stirrup cage.

[0013] Furthermore, the second stirrup cage includes a plurality of basic stirrups and a plurality of spiral bars, the plurality of basic stirrups are longitudinally arranged and distributed in an annular manner, and the plurality of spiral bars are used to bind the plurality of basic stirrups to form the second stirrup cage.

[0014] Furthermore, after the concrete pouring in step S6 is completed, the surface of the pile foundation should be kept moist until the pile foundation hardens.

[0015] Furthermore, in step S6, after the pile foundation is hardened, the quality of the pile foundation is inspected according to the principle that the number of random inspections shall not be less than 1% of the total number and shall not be less than 6.

[0016] Furthermore, according to the stratigraphic composition of each area, a number of typical areas covering various rock formations were selected for pile testing, with three test piles used in each area.

[0017] Furthermore, the pile top of the pile foundation is higher than the ground.

[0018] Furthermore, the pile foundation uses C30 concrete, and each photovoltaic bracket uses four pile foundations.

[0019] The beneficial effects of the present invention are as follows: the present invention can effectively reduce the risk of settlement caused by uneven foundation through the fine construction of drilling, hole cleaning, making, installing steel cages and pouring concrete. At the same time, through the combined action of the steel cages and the concrete pile foundation, the weight of the photovoltaic bracket and its components can be effectively dispersed into the foundation, while resisting the influence of external loads such as wind and snow loads, ensuring the safe and stable operation of the photovoltaic power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0021] Among them: 1. The first stirrup cage; 2. The second stirrup cage; 3. Embedded steel pipe; 4. Photovoltaic support column.

[0022] 11. Longitudinal stirrups; 12. Transverse stirrups; 21. Foundation stirrups; 22. Spiral reinforcement. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiment is only one embodiment of the present invention, not all 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 protection scope of the present invention.

[0024] In order to make the objectives, technical solutions and advantages of the present application more clear, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] In the following description, references to "one embodiment", "an embodiment", "an example", "an example", etc. indicate that the embodiment or example described in this way may include specific features, structures, characteristics, properties, elements or limitations, but not every embodiment or example necessarily includes the specific features, structures, characteristics, properties, elements or limitations. In addition, repeated use of the phrase "according to one embodiment of the present application" may refer to the same embodiment, but does not necessarily refer to the same embodiment.

[0026] like Figure 1 As shown, the present invention discloses a construction method of a photovoltaic support foundation, which comprises the following steps:

[0027] S1. Laying out and positioning: Determine the specific installation location of the photovoltaic bracket and its components; through accurate laying out and positioning, ensure that the photovoltaic bracket is installed in the best and most stable position, which helps to evenly distribute the load and reduce the risk of settlement and tilting caused by uneven foundation.

[0028] S2. Drilling: Use a drilling machine to drill holes according to the designed hole diameter, depth and verticality; ensure that the pile foundation can penetrate possible soft soil layers and reach rock or soil layers with higher bearing capacity.

[0029] S3. Hole cleaning: Use hole cleaning equipment to clean the soil, gravel, etc. in the hole to ensure that the hole wall is smooth and free of debris; clean the debris in the hole to ensure good contact between the concrete and the soil to prevent impurities from affecting the bearing capacity of the foundation, thereby improving the foundation's ability to withstand loads on uneven foundations.

[0030] S4, making a steel cage: the steel cage includes a first hoop cage 1 and a second hoop cage 2, the second hoop cage 2 is sleeved on the top of the first hoop cage 1 and fixed, the first hoop cage 1 and the second hoop cage 2 are formed with installation openings on the top, and the embedded steel pipe 3 is vertically installed in the installation openings;

[0031] That is, the length of the first hoop cage 1 is longer than that of the second hoop cage 2. The second hoop cage 2 is mounted on the top of the first hoop cage 1 and fixed, which helps to resist uneven settlement of the foundation and enhance the tensile and compressive resistance of the foundation, especially on foundations with weak bearing capacity or insufficient consolidation, which helps to disperse the load and enhance the integrity and stability of the pile foundation. The embedded steel pipe 3 is vertically installed in the installation opening of the steel cage, providing a reliable connection point for the photovoltaic bracket. Through the embedded steel pipe 3, the photovoltaic bracket can be more firmly connected to the pile foundation to form an integral structure.

[0032] S5. Steel cage installation: Place the steel cage into the drilled hole to ensure that the position of the steel cage is correct and the verticality meets the requirements; avoid uneven stress distribution caused by construction errors and effectively improve the overall stability of the foundation.

[0033] S6. Concrete pouring: Use a delivery pump or manual method to deliver the mixed concrete to the drill hole, and use a vibrator to vibrate the concrete to ensure that the concrete is dense and has no voids to form a pile foundation. This can effectively resist the force and uneven stress distribution caused by foundation deformation, and improve the stability of the support foundation under different geological conditions.

[0034] The present invention can effectively reduce the risk of settlement caused by uneven foundation through the fine construction of drilling, hole cleaning, making, installing steel cage and pouring concrete. At the same time, through the joint action of steel cage and concrete pile foundation, the weight of photovoltaic bracket and its components can be effectively dispersed into the foundation, while resisting the influence of external loads such as wind force and snow load, ensuring the safe and stable operation of photovoltaic power station.

[0035] In one embodiment, the first stirrups include a plurality of longitudinal stirrups 11 and a plurality of transverse stirrups 12. The plurality of longitudinal stirrups 11 are arranged at intervals in a ring shape, and the plurality of transverse stirrups 12 are arranged at intervals in the longitudinal direction, and are used to bind the plurality of longitudinal stirrups 11 to form a first stirrup cage 1. That is, the plurality of longitudinal stirrups 11 are the main bearing structure, and usually steel bars of a certain diameter (such as HRB300 or HRB400, etc.) are used. These steel bars are arranged vertically in the foundation hole to form a cylindrical support structure. The transverse stirrups 12 are arranged at intervals in the longitudinal direction, and are used to bind the longitudinal stirrups 11 together to form an integrally stable first stirrup cage 1, which can withstand a large vertical load and improve the bending and shearing resistance of the structure.

[0036] In one embodiment, the second hoop cage 2 includes a plurality of basic hoop bars 21 and a plurality of spiral bars 22. The plurality of basic hoop bars 21 are longitudinally arranged and distributed in annular intervals. The plurality of spiral bars 22 are used to bind the plurality of basic hoop bars 21 to form the second hoop cage 2. The plurality of basic hoop bars 21 are arranged vertically in the foundation hole to form a cylindrical support structure. Like a wire ring, a large number of spiral bars 22 are wound around the basic hoop bars 21 to play a role of binding and reinforcement. The configuration of the spiral bars 22 is usually arranged in a spiral shape, which can enhance the integrity of the hoop cage in the transverse and longitudinal directions.

[0037] The first hoop cage 1 is concise and clear, forming a relatively concise and effective network structure suitable for bearing large vertical loads; the second hoop cage 2 makes the entire structure more stable under static and dynamic loads, significantly improving the overall shear resistance, bending resistance and seismic toughness. The combination of the two can significantly improve the bearing capacity and durability of the pile foundation.

[0038] Second stirrup cage 2: The addition of spiral reinforcement 22 makes the second stirrup cage 2 have better bearing performance in multiple directions, especially in terms of shear resistance and bending resistance. Spiral tying can provide a greater structural stress dispersion effect.

[0039] In one embodiment, after the concrete pouring is completed in step S6, the surface of the pile foundation should be kept moist until the pile foundation hardens. That is, after the concrete pouring is completed, maintenance work should be carried out. During the maintenance period, the pile body needs to be kept moist to avoid the phenomenon of concrete cracking. The maintenance time is generally not less than 14 days.

[0040] In one embodiment, in step S6, after the pile foundation is hardened, the pile foundation is quality inspected according to the principle that the number of random inspections is not less than 1% of the total number, and should not be less than 6, to ensure the adequacy and effectiveness of the quality assessment. When conducting the quality inspection of the pile foundation, a commonly used detection method can be to use an ultrasonic detection instrument to check whether there are defects (such as cracks, cavities, etc.) inside the pile body. Or drill core samples from the pile foundation to measure the strength and quality of the concrete. Evaluate the performance of the pile foundation to ensure the overall stability and safety of the project. In addition, when encountering obvious weakness in the local stratum, the number of random inspections should be appropriately increased.

[0041] In one embodiment, according to the stratum composition of each region, multiple typical regions covering various rock formations are selected for trial piles, and three trial piles are used in each region. The influence of different strata on pile foundation performance can be effectively evaluated, providing important theoretical and data support for the design and construction of pile foundations. This process is the basis for ensuring the quality and safety of the project, and must be strictly implemented and the data must be comprehensively analyzed to ensure the smooth progress of the project.

[0042] That is, before carrying out the test pile work, it is necessary to first conduct a detailed analysis of the stratum composition of the construction area, including soil type, rock layer distribution, water level changes, etc., in order to select representative areas for test piles. According to the geological survey report, select multiple typical areas covering various rock layers (such as sand, clay, pebble layers, rocks, etc.). These areas should reflect the geological characteristics and changes of the selected sections as much as possible to improve the representativeness of the test piles. At least three test piles should be used in each selected typical area. This can provide sufficient data to analyze the pile foundation behavior under different strata. After passing the test, the photovoltaic bracket foundation construction of the entire area can be carried out.

[0043] In one embodiment, the top of the pile foundation is higher than the ground. In areas with high water levels or flood risk, the top of the pile is higher than the ground to prevent the pile foundation from being submerged by water, ensuring the stability and safety of the structure. Or in some areas, the ground may rise due to factors such as settlement, soil deformation or engineering changes. Keeping the top of the pile higher than the ground can prevent the pile from being buried underground.

[0044] In one embodiment, the pile foundation uses C30 concrete, and each photovoltaic bracket uses four pile foundations. C30 concrete is suitable for pile foundations that bear large loads and has good bearing capacity and durability. It has good plasticity during construction, which is conducive to ensuring the accuracy of the shape and size of the pile body during the construction process. At the same time, it usually has good impermeability, frost resistance and durability, and is suitable for long-term use under changeable climatic conditions. Each photovoltaic bracket uses four pile foundations. Such a design can evenly distribute the load and improve the stability and anti-overturning ability of the structure.

[0045] The embodiments of the present invention are as follows:

[0046] According to topographic survey, the planned site of the photovoltaic power generation project in this embodiment is between 2300m and 2600m above sea level. The terrain is steep in some areas. It belongs to the plateau landform type, and the surface is mainly reclaimed land, does not involve basic farmland, and has a small amount of shrub woodland. The vegetation is relatively developed, mainly miscellaneous trees, shrubs, bamboo forests and weeds. Silty clay, fully weathered, strongly weathered and moderately weathered granite are distributed in the new site, and the stratigraphic composition of each area is similar. Therefore, it is initially planned to test 9 piles, select three typical areas for test piles, and use 3 test piles in each area.

[0047] After the test pile is completed and qualified, the formal pile foundation construction will be carried out, firstly, the positioning, drilling and hole cleaning operations will be carried out. At the same time, the first hoop cage 1 and the second hoop cage 2 are tied and installed on site into the drilled hole. Finally, the C30 reinforced concrete poured on site has a pile diameter of 250mm. Each photovoltaic bracket uses 4 piles. Considering the influence of the terrace terrain and vegetation, the average pile length is 2500mm, and the pile top is 500mm above the ground.

[0048] Usually, curing begins within 6 to 18 hours after concrete pouring, depending on the degree of concrete solidification and construction conditions. In hot seasons, depending on the degree of concrete solidification, the curing time may be advanced. Use plastic film or other moisturizing materials to cover the concrete surface to reduce water evaporation and keep the concrete surface moist. Or arrange for special personnel to regularly sprinkle water for maintenance to ensure that the concrete surface is always moist. The frequency and amount of watering should be adjusted according to weather conditions and the specific conditions of the concrete.

[0049] After the pile foundation is hardened, the quality inspection of the pile foundation is carried out according to the principle that the number of random inspections shall not be less than 1% of the total number, and shall not be less than 6 piles, to ensure the adequacy and effectiveness of the quality assessment. When conducting pile foundation quality inspection, the commonly used inspection method can be to use ultrasonic detection equipment to check whether there are defects (such as cracks, voids, etc.) inside the pile body. Or drill core samples from the pile foundation to measure the strength and quality of the concrete. Evaluate the performance of the pile foundation to ensure the overall stability and safety of the project. After the random inspection is qualified, the photovoltaic bracket column 4 can be installed.

[0050] The present invention can effectively reduce the risk of settlement caused by uneven foundation through the fine construction of drilling, hole cleaning, making, installing steel cage and pouring concrete. At the same time, through the joint action of steel cage and concrete pile foundation, the weight of photovoltaic bracket and its components can be effectively dispersed into the foundation, while resisting the influence of external loads such as wind force and snow load, ensuring the safe and stable operation of photovoltaic power station.

[0051] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A construction method for a photovoltaic support foundation, characterized in that: The following steps are involved: S1. Laying out and positioning: Determine the specific installation location of the photovoltaic bracket and its components; S2. Drilling: Use a drilling machine to drill holes according to the designed hole diameter, depth and verticality; S3. Hole cleaning: Use hole cleaning equipment to clean the soil, gravel, etc. in the hole to ensure that the hole wall is smooth and free of debris; S4, manufacturing a steel cage: the steel cage includes a first hoop cage and a second hoop cage, the second hoop cage is sleeved on the top of the first hoop cage and fixed, the tops of the first hoop cage and the second hoop cage are formed with installation openings, and the embedded steel pipes are vertically installed in the installation openings; S5. Installation of steel cage: Place the steel cage into the drilled hole and ensure that the position of the steel cage is correct and the verticality meets the requirements; S6. Concrete pouring: Use a delivery pump or manual method to deliver the mixed concrete to the drill hole, and use a vibrator to vibrate the concrete to ensure that the concrete is dense and has no voids to form a pile foundation.

2. A photovoltaic support foundation construction method according to claim 1, characterized in that: The first stirrups include a plurality of longitudinal stirrups and a plurality of transverse stirrups. The plurality of longitudinal stirrups are arranged in a ring-shaped manner, and the plurality of transverse stirrups are arranged in a longitudinal manner, and are used to bind the plurality of longitudinal stirrups to form the first stirrup cage.

3. A photovoltaic support foundation construction method according to claim 2, characterized in that: The second stirrup cage includes a plurality of basic stirrups and a plurality of spiral bars. The plurality of basic stirrups are longitudinally arranged and distributed in an annular manner. The plurality of spiral bars are used to bind the plurality of basic stirrups to form the second stirrup cage.

4. The construction method of a photovoltaic support foundation according to claim 1, characterized in that: After the concrete pouring in step S6 is completed, the surface of the pile foundation should be kept moist until the pile foundation hardens.

5. The construction method of a photovoltaic support foundation according to claim 1, characterized in that: In step S6, after the pile foundation is hardened, the quality of the pile foundation is inspected according to the principle that the number of random inspections shall not be less than 1% of the total number and shall not be less than 6.

6. The construction method of a photovoltaic support foundation according to claim 1, characterized in that: In step S6, multiple typical areas covering various rock formations are selected for pile testing according to the formation composition of each area, and three test piles are used in each area.

7. The construction method of a photovoltaic support foundation according to claim 1, characterized in that: The pile top of the pile foundation is higher than the ground.

8. The construction method of a photovoltaic support foundation according to claim 1, characterized in that: The pile foundation uses C30 concrete, and each photovoltaic bracket uses four pile foundations.

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