Construction method for pile foundation of photovoltaic support, pile foundation, and photovoltaic support

Abstract

The present invention relates to the field of photovoltaic apparatuses. Provided are a construction method for a pile foundation of a photovoltaic support, a pile foundation, and a photovoltaic support. The construction method for a pile foundation of a photovoltaic support comprises: performing a pull-out force test, so as to obtain the actual friction coefficient of an installation area; prefabricating an upright during or prior to the pull-out force test; prefabricating an auxiliary pile after the pull-out force test; and fixedly connecting the auxiliary pile to the upright, so as to enhance the pull-out force of the upright. The pile foundation comprises an upright and an auxiliary pile, wherein the upright has an embedment end capable of being embedded into the soil and a fitting end adapted for mounting a load-bearing body; and the auxiliary pile is mounted close to the embedment end of the upright, enabling the pull-out force of the upright to be enhanced. The photovoltaic support comprises the pile foundation. According to the construction method for a pile foundation of a photovoltaic support, the pile foundation, and the photovoltaic support provided in the present invention, an upright can be prefabricated during or prior to a pull-out force test, and the pull-out force of the upright can be enhanced by fixedly connecting an auxiliary pile to said upright after the pull-out force test, enabling the upright to meet the pull-out force test requirements, greatly shortening the construction period and reducing project costs.

Description

Photovoltaic support pile foundation construction method, pile foundation, and photovoltaic support Technical Field

[0001] The present invention relates to the field of photovoltaic equipment, and further relates to a photovoltaic support pile foundation construction method, a pile foundation, and a photovoltaic support. Background Art

[0002] In actual photovoltaic power station projects, it is necessary to conduct pull-out force tests and determine the buried depth of the columns, thereby determining the length of the columns. Before the pull-out force test results come out, the length of the columns cannot be determined. However, the pull-out force test is generally conducted by a third-party testing agency, and the cycle from commission to result is relatively long. In many photovoltaic power station projects, the upper structure of the columns is often determined, but the buried depth of the lower part of the columns cannot be determined. As a result, the construction of the photovoltaic power station project is temporarily stagnant, which greatly affects the overall project cycle of the photovoltaic power station project.

[0003] Summary of the Invention

[0004] In response to the above technical problems, the purpose of the present invention is to provide a photovoltaic bracket pile foundation construction method, pile foundation and photovoltaic bracket, which can prefabricate columns at the same time or before the pull-out force test, and increase the pull-out force of the columns by fixedly connecting auxiliary piles after the pull-out force test, so that the columns meet the pull-out force test requirements, greatly shorten the construction period, reduce the time required for the project, and reduce the project cost.

[0005] In order to achieve the above-mentioned object, the present invention provides a photovoltaic support pile foundation construction method, comprising: performing a pull-out force test to obtain an actual friction coefficient of the area to be installed;

[0006] Prefabricate the columns simultaneously with or before performing the pull-out test;

[0007] prefabricating secondary piles after performing the pull-out test;

[0008] The auxiliary pile is fixedly connected to the column to enhance the pulling force of the column.

[0009] In some embodiments, the fixedly connecting the auxiliary pile to the column includes: fixing the column and the auxiliary pile together and then burying them in the area to be installed, or separately burying the column and the auxiliary pile in the area to be installed and then fixing them together.

[0010] In some embodiments, before the auxiliary pile is fixedly connected to the column, the column and the auxiliary pile are tested, and the testing process includes:

[0011] Drive single piles, welded integral piles, and bolted integral piles respectively, and record the time required to drive to the same depth and the deformation of the pile heads;

[0012] Pull out the single pile, welded integral pile and bolted integral pile respectively, and record the actual minimum pulling force value.

[0013] In some embodiments, the design of the column specifically includes:

[0014] Preliminarily calculating the theoretical pull-out force of the column, and obtaining the contact area between the column and the soil based on the theoretical pull-out force; calculating the theoretical burial depth of the column based on the contact area between the column and the soil and the theoretical pull-out force of the column;

[0015] The actual burial depth of the column is determined according to the theoretical burial depth of the column, and the actual burial depth of the column is less than the theoretical burial depth.

[0016] In some embodiments, the design process of the secondary pile includes: determining an actual pull-out force of the column based on an actual buried depth of the column and an actual friction coefficient of the area to be installed;

[0017] Calculating the difference between the theoretical pull-out force and the actual pull-out force, i.e., the auxiliary pile pull-out force;

[0018] The contact area between the auxiliary pile and the soil is calculated based on the pull-out force of the auxiliary pile and the actual friction coefficient of the area to be installed.

[0019] According to another aspect of the present application, a pile foundation is further provided, comprising a column and an auxiliary pile, which are prefabricated at the same time as or before a pull-out force test, wherein the column has an embedded end and an assembly end, wherein the embedded end can be embedded in the soil to fix the column; the assembly end is suitable for installing a carrier; the auxiliary pile is prefabricated after the pull-out force test, and is installed on the column near the embedded end, and the auxiliary pile is at least partially embedded in the soil, and the auxiliary pile is fixedly connected to the column to increase the contact area between the column and the soil, thereby enhancing the pull-out force of the column.

[0020] In some embodiments, both the upright post and the auxiliary pile are provided with an open slot, and the open slot of the upright post and the open slot of the auxiliary pile are arranged opposite to or opposite to each other.

[0021] In some embodiments, the upright column and the secondary pile are fixed by fasteners or welding.

[0022] In some embodiments, the secondary pile at least partially coincides with the column.

[0023] In some embodiments, there is one auxiliary pile, which is fixedly installed on either side of the column.

[0024] In some embodiments, there are two or more auxiliary piles, which are fixedly installed on any two sides or the same side of the column.

[0025] In some embodiments, the cross-sections of the upright column and the auxiliary pile are any one of H-shaped, C-shaped, I-shaped, cross-shaped, L-shaped, T-shaped or rectangular.

[0026] According to another aspect of the present application, a photovoltaic support is further provided, comprising any one of the pile foundations of the above preferred embodiments.

[0027] Compared with the prior art, the photovoltaic support pile foundation construction method, pile foundation, and photovoltaic support provided by the present invention have the following beneficial effects:

[0028] 1. The present invention provides a photovoltaic support pile foundation construction method, which can prefabricate columns at the same time as or before the pull-out force test, and increase the pull-out force of the columns by fixedly connecting auxiliary piles after the pull-out force test, so that the columns meet the pull-out force test requirements, greatly shorten the construction period, reduce the time required for the project, and reduce the project cost.

[0029] 2. The pile foundation provided by the present invention can be produced in a standardized manner, which facilitates material preparation and speeds up project delivery. It is even possible to bury the columns in the installation area in advance and then assemble purlins, main shafts, photovoltaic modules and other supporting bodies on the assembly ends of the columns. After the pull-out force test results are available, auxiliary piles can be installed at the buried ends of the columns based on the difference between the theoretical pull-out force of the columns and the actual pull-out force of the columns, thereby greatly shortening the construction period and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0031] FIG1 is a flow chart of a photovoltaic support pile foundation construction method according to an embodiment;

[0032] FIG2 is a design flow chart of a column in one embodiment;

[0033] Fig. 3 is a design flow chart of a secondary pile in one embodiment;

[0034] FIG4 is an assembly diagram A of a column and a secondary pile in one embodiment;

[0035] FIG5 is a cross-sectional view A of a column and a secondary pile in one embodiment;

[0036] FIG6 is an assembly diagram B of a column and a secondary pile in another embodiment;

[0037] FIG7 is a cross-sectional view B of a column and a secondary pile in another embodiment;

[0038] Figure 8 is a diagram showing the positions of the columns and a single auxiliary pile;

[0039] FIG9 is a position diagram of a column and a plurality of auxiliary piles;

[0040] FIG10 is a schematic diagram of a column structure in an embodiment.

[0041] Description of the accompanying drawings: pile foundation 1, column 11, hole 110, embedded end 111, assembly end 112, auxiliary pile 12, fastener 13. DETAILED DESCRIPTION

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive work.

[0043] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0044] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0045] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0046] In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance. It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered within the scope of protection of the present invention.

[0047] Example 1:

[0048] In one embodiment, referring to FIG1 , the present application provides a photovoltaic support pile foundation construction method, comprising:

[0049] S100 performs a pull-out force test to obtain the actual friction coefficient of the area to be installed. In this embodiment, the pull-out force test is generally performed by a third-party testing agency to obtain the actual friction coefficient of the area to be installed.

[0050] It's worth noting that third-party pull-out force testing by testing agencies takes a long time and can seriously delay the overall project progress. Therefore, before the third-party pull-out force test results are available, you can first determine the theoretical friction coefficient of the installation area based on project experience data and historical soil property reports for the installation area. The soil properties of the installation area include soil particle size, moisture content, looseness, etc. The soil friction coefficient varies from installation area to installation area. Even within the same installation area, soil properties can vary at different locations, resulting in different friction coefficients. Therefore, when conducting a pull-out force test, it is necessary to sample and test multiple points in the installation area to determine the actual friction coefficient of the soil in the installation area. The friction coefficient can be tested by sampling in the laboratory, performing dynamic penetration tests directly in the installation area, performing static load tests, plate load tests, and drilling sampling. These tests can obtain actual data on the mechanical properties and friction coefficient of the soil in the field. The method for determining the friction coefficient is a relatively mature technology and a common technical means in this field, so it will not be elaborated here.

[0051] S101 prefabricates the columns 11 while or before the pull-out force test. In this embodiment, the pull-out force test time of the third party is generally longer. At the same time as or before the actual friction coefficient result of the area to be installed comes out, in order to save the overall project time, the columns 11 can be prefabricated according to the theoretical friction coefficient of the area to be installed, and the columns 11 can be buried in the area to be installed in advance and the purlins, main shafts and photovoltaic components and other carriers on the columns 11 can be assembled. The prefabrication of the columns 11 includes one or more processes such as design, production, procurement, material preparation, transportation, and embedment. There is no need to wait for the pull-out force test results to come out before starting to prefabricate the columns 11. This greatly shortens the construction period, reduces the time required for the project, and reduces the project cost. Specifically, with reference to Figure 2, the design of the column 11 includes:

[0052] S200 preliminarily calculates the theoretical pull-out force of the column 11, and obtains the contact area between the column 11 and the soil based on the theoretical pull-out force. Specifically, the theoretical pull-out force of the prefabricated column 11 needs to be determined based on the maximum annual wind speed in the area to be installed, combined with factors such as snow load, earthquake, temperature, and fixed load. The method for calculating the theoretical pull-out force of the column 11 is also a technical means commonly used by those skilled in the art, and will not be repeated here. The theoretical friction coefficient of the area to be installed and the theoretical pull-out force of the column 11 are both obtainable by those skilled in the art based on existing technology, and have a certain degree of practical reliability. The theoretical friction coefficient of the area to be installed is B1, the theoretical pull-out force of the column 11 is A1, and the contact area between the column 11 and the soil is S1, S1=A1 / B1.

[0053] S201 calculates the theoretical burial depth of column 11 based on the contact area between column 11 and the soil and the theoretical pull-out force of column 11. Specifically, when prefabricating column 11, columns 11 with different cross-sections can be selected based on project requirements. The cross-sections of column 11 can be H-shaped, C-shaped, I-shaped, cross-shaped, L-shaped, T-shaped, or rectangular, and the outer circumference of column 11 can also vary. The outer circumference of column 11 is C, and the theoretical burial depth of column 11 is H1, where H1 = S1 / C.

[0054] S202 determines the actual burial depth of column 11 based on the theoretical burial depth of column 11. The actual burial depth of column 11 is less than the theoretical burial depth. Specifically, under normal circumstances, the actual burial depth of column 11 is approximately 10-20% less than the theoretical burial depth of column 11. The actual burial depth of column 11 is H2. If the theoretical burial depth of column 11 is 2 meters, the actual burial depth is 1.6-1.8 meters. The actual burial depth of column 11 is the actual depth of column 11 buried in the soil.

[0055] S102 Prefabricate the auxiliary piles 12 after the pull-out force test. In this embodiment, there will be a slight deviation between the theoretical friction coefficient of the area to be installed and the actual friction coefficient of the area to be installed. The purpose of the auxiliary piles 12 is to increase the pull-out force of the column 11 so that it meets the actual needs of the project. The present invention focuses on the concept of adding auxiliary piles 12 to the column 11. The column 11 is prefabricated at the same time or before the pull-out force test, and the auxiliary piles 12 are prefabricated after the pull-out force test. Specifically, referring to Figure 3, the design of the auxiliary piles 12 includes:

[0056] S300 determines the actual pull-out force of column 11 based on the actual buried depth of column 11 and the actual friction coefficient of the area to be installed. Specifically, if the actual buried depth of column 11 is H2 and the actual friction coefficient of the area to be installed is B2, the actual pull-out force of column 11 is A2, where A2 = H2*B2.

[0057] S301 calculates the difference between the theoretical pull-out force and the actual pull-out force, i.e., the pull-out force of the auxiliary pile 12. The pull-out force of the auxiliary pile 12 is A3, where A3 = A2 - A1.

[0058] S302 calculates the contact area between the auxiliary pile 12 and the soil based on the pull-out force of the auxiliary pile 12 and the actual friction coefficient of the area to be installed. Specifically, the contact area between the auxiliary pile 12 and the soil is S2, where S2 = A3 / B2. The cross-section of the auxiliary pile 12 can also be selected according to project requirements. The cross-section of the auxiliary pile 12 also includes any one of an H-shape, a C-shape, an I-shape, a cross shape, an L-shape, a T-shape, or a rectangle. The cross-section of the auxiliary pile 12 can be consistent with or different from the cross-section of the column 11. The outer circumference of the auxiliary pile 12 can be obtained based on the cross-section of the auxiliary pile 12, and the buried depth of the auxiliary pile 12 can be calculated based on the outer circumference of the auxiliary pile 12. The outer circumference of the auxiliary pile 12 is C2, and the buried depth of the auxiliary pile 12 is H2, where H2 = B2 / C2.

[0059] S103 fixes the auxiliary pile 12 to the column 11 to enhance the pull-out force of the column 11. Specifically, fixed connection means that there is no relative movement between the column 11 and the auxiliary pile 12 after they are connected, and the fixed connection method includes detachable fixation by fasteners 13 or integral fixation by welding. Specifically, when the column 11 and the auxiliary pile 12 are detachably fixed by fasteners 13, holes 110 for the fasteners 13 to pass through are respectively provided on the column 11 and the auxiliary pile 12. As shown in Figure 10, a plurality of holes 110 for the fasteners to pass through are provided on the column 11, and the plurality of holes 110 are arranged in a diamond shape. The diamond arrangement makes the connection between the column 11 and the auxiliary pile 12 more stable. The present invention does not further limit the order in which the auxiliary pile 12 is fixedly connected to the column 11 and buried in the area to be installed. The column 11 and the auxiliary pile 12 can be fixedly connected and then buried together in the area to be installed, or the column 11 and the auxiliary pile 12 can be buried separately in the area to be installed and then fixedly connected.

[0060] At the same time, a more appropriate fixed connection method can also be selected based on the result time of the pull-out force test. In the case where the column 11 and the auxiliary pile 12 are determined simultaneously, compared with the form of a single column 11, the combination of the main and auxiliary piles 12 can reduce the burial depth of the column 11, shorten the piling time, and thus shorten the project period. In the case that the pull-out force test results come out later, the column 11 can be driven into the ground first, and then the auxiliary pile 12 can be driven in according to the pull-out force test results, and finally the column 11 and the auxiliary pile 12 are fixed. At this time, the auxiliary pile 12 needs to be partially exposed to the ground, and the hole 110 for accommodating the fastener 13 to pass through is set in the part of the auxiliary pile 12 exposed to the ground, so as to achieve a fixed connection with the column 11.

[0061] The fixed connection between the column 11 and the auxiliary pile 12 should also take into account the partial overlap of the column 11 and the auxiliary pile 12. The present invention does not further limit the fixing form of the auxiliary pile 12 and the column 11, as long as the total pull-out force of the column 11 and the auxiliary pile 12 can meet the pull-out force test requirements. If the column 11 and the auxiliary pile 12 are connected surface to surface, it is necessary to consider the influence of the overlapping area of ​​the column 11 and the auxiliary pile 12 on the pull-out force of the column 11 and the auxiliary pile 12, and the total buried area of ​​the column 11 and the auxiliary pile 12 can be calculated; the total buried area is equal to the sum of the actual buried area of ​​the column 11 and the buried area of ​​the auxiliary pile 12, minus the overlapping area of ​​the column 11 and the auxiliary pile 12. Alternatively, if the buried depth of column 11 and auxiliary pile 12 is the same, the total outer circumference of column 11 and auxiliary pile 12 can be calculated. The total outer circumference is equal to the sum of the circumferences of column 11 and auxiliary pile 12, minus the overlapping circumference of column 11 and auxiliary pile 12. If column 11 and auxiliary pile 12 are fixedly connected by a point-to-surface or point-to-point connection, the overlapping area of ​​column 11 and auxiliary pile 12 approaches zero and is therefore not considered.

[0062] It is noteworthy that the present invention focuses on the addition of the auxiliary pile 12 on the basis of the column 11. All the fixed connection methods and fixed connection sequences of the column 11 and the auxiliary pile 12 are included in the concept of the present invention.

[0063] Preferably, before the auxiliary pile 12 is fixedly connected to the column 11, the column 11 and the auxiliary pile 12 are tested to determine whether the selected auxiliary pile 12 meets the requirements and whether welding or bolting is more suitable. The testing process includes:

[0064] S400 drives a single pile, a welded integral pile, and a bolted integral pile, respectively, and records the time required to drive them to the same depth and the deformation of the pile head. Specifically, by recording the time required to drive them to the same depth and the deformation of the pile head, it is possible to determine the ease of driving a single pile, a welded integral pile, and a bolted integral pile, as well as the change in friction of the single pile, welded integral pile, and bolted integral pile after driving them to the same depth. Based on the recorded driving time and pile head deformation, it is possible to choose whether to securely connect the column 11 and the auxiliary pile 12 and then bury them together in the area to be installed, or to securely connect the column 11 and the auxiliary pile 12 and then bury them separately in the area to be installed.

[0065] S401 pulls out a single pile, a welded integral pile, and a bolted integral pile respectively, and records the actual minimum pulling force value of the pull-out. Specifically, the actual minimum pulling force value refers to the minimum pulling force used to pull out the test object such as a single pile, a welded integral pile, or a bolted integral pile from the soil. By recording the actual minimum pulling force value of the pull-out, the actual increase in the pulling force value after adding the auxiliary pile 12 can be obtained, thereby judging whether the pulling force of the pile foundation after adding the auxiliary pile 12 meets the design requirements, preventing a large difference between the theoretical pulling force and the actual pulling force, and increasing the reliability of the auxiliary pile 12. A single pile is a separate column 11, a welded integral pile is formed by welding the column 11 and the auxiliary pile 12; a bolted integral pile is formed by fixing the column 11 and the auxiliary pile 12 with fasteners 13 such as bolts. In addition, by testing the welded integral pile and the bolted integral pile respectively, it can be understood whether there is a difference in the actual pulling force of the pile foundation due to different fixing methods, thereby determining which fixing method can better meet the design requirements.

[0066] Embodiment 2: Referring to Figures 4 to 7, the present invention also provides a pile foundation 1, including a column 11 and an auxiliary pile 12. The column 11 is prefabricated at the same time as or before the pull-out force test. The column 11 has an embedded end 111 and an assembly end 112. The embedded end 111 can be buried in the soil to fix the column 11; the assembly end 112 is suitable for installing a bearing body; the auxiliary pile 12 is prefabricated after the pull-out force test is performed. The auxiliary pile 12 is installed on the column 11 near the embedded end 111, and the auxiliary pile 12 is at least partially buried in the soil. The auxiliary pile 12 is fixedly connected to the column 11 to increase the contact area between the column 11 and the soil, thereby enhancing the pull-out force of the column 11.

[0067] The pile foundation 1 in this embodiment is obtained by adopting the photovoltaic bracket pile foundation 1 construction method in any of the above embodiments. The auxiliary pile 12 can be fixedly connected to the column 11 and increase the pull-out force of the column 11. The auxiliary pile 12 and the column 11 together bear the upward force of the upper structure of the column 11 to meet the pull-out force requirements of different photovoltaic power stations. This makes it possible to prepare standardized production materials for the column 11 and process the column 11 in advance, which is convenient for material preparation and speeds up the project delivery progress. It is even possible to drive the column 11 into the installation area of ​​the project zone in advance, and assemble purlins, main shafts, photovoltaic components and other carriers on the assembly end 112 of the column 11. After the pull-out force test results come out, the auxiliary pile 12 is installed at the embedded end 111 of the column 11 according to the difference between the theoretical pull-out force of the column 11 and the actual pull-out force of the column 11, which greatly shortens the construction period, reduces the time required for the project, and reduces the project cost.

[0068] Specifically, the column 11 is prefabricated simultaneously with or before the pull-out force test, and the auxiliary pile 12 is prefabricated after the pull-out force test. The contact area and burial depth of the auxiliary pile 12 are determined according to the difference between the theoretical pull-out force and the actual pull-out force of the column 11. The auxiliary pile 12 can be partially inserted into the ground or fully inserted into the ground. The present invention does not further limit the fixed connection form between the auxiliary pile 12 and the column 11. It can be that the lower end of the auxiliary pile 12 is fixedly connected to the lower end of the column 11, or the upper end of the auxiliary pile 12 is fixedly connected to the lower end of the column 11, etc. As long as the auxiliary pile 12 can increase the pull-out force of the pile foundation 1.

[0069] Further, both the column 11 and the auxiliary pile 12 are provided with opening grooves, and the opening grooves of the column 11 are arranged opposite or back to the opening grooves of the auxiliary pile 12.

[0070] It should be noted that the pile foundations 1 on the market are generally divided into two types. One is the split type, where the column 11 is fixed on a cement precast pile or a helical ground pile. The other is the integral type, where the column 11 is the embedded pile. This design upgrades the existing embedded pile form. Without changing the original burial depth of the column 11, an auxiliary pile 12 is added to the column 11 to increase the pull-out force of the pile foundation 1 to meet the pull-out force test requirements, so as to meet the demand for standardized production of the column 11.

[0071] Further, referring to FIG. 7, both the column 11 and the auxiliary pile 12 are provided with opening grooves, and the opening grooves of the column 11 are arranged opposite or back to the opening grooves of the auxiliary pile 12.

[0072] In this embodiment, both the column 11 and the auxiliary pile 12 being provided with opening grooves can save the materials of the column 11 and the auxiliary pile 12 while increasing the contact area between the column 11 and the auxiliary pile 12 and the soil.

[0073] Specifically, when the opening grooves of the column 11 are arranged opposite to the opening grooves of the auxiliary pile 12, at least part of the groove wall of the column 11 abuts against the groove wall of the auxiliary pile 12. When the opening grooves of the column 11 are arranged back to the opening grooves of the auxiliary pile 12, at least part of the groove bottom of the column 11 abuts against the groove bottom of the auxiliary pile 12. It should be noted that the column 11 and the auxiliary pile 12 can also be "cross"-shaped cross-section piles, "square"-shaped, "I"-shaped, "well"-shaped, C-shaped, H-shaped cross-section piles, etc. As long as the column 11 and the auxiliary pile 12 can meet the project requirements and the pull-out force test. <00001Furthermore, the column 11 and the auxiliary pile 12 are fixed by fasteners 13 or welding. The fasteners 13 include fixing structures such as bolts, rivets, studs, and screws. Among them, the use of fasteners 13 to fix the column 11 and the auxiliary pile 12 is more flexible. The column 11 and the auxiliary pile 12 can be fixed and installed by fasteners 13 at the project site or in the production plant, and then the column 11 and the auxiliary pile 12 can be driven into the soil together; or the column 11 can be driven into the soil first, and then the auxiliary pile 12 can be driven into the soil, and then the column 11 and the auxiliary pile 12 can be fixedly connected with the fastener 13. The fixing methods of the column 11 and the auxiliary pile 12 in the present invention are not limited to these methods, as long as the column 11 and the auxiliary pile 12 can be fixedly connected and the auxiliary pile 12 can increase the pull-out force of the pile foundation 1.

[0075] Furthermore, the auxiliary pile 12 at least partially overlaps with the column 11. In this embodiment, the overlapping portion and the arrangement orientation of the auxiliary pile 12 and the column 11 are not further limited. The auxiliary pile 12 can be set on either side of the column 11, and the bottoms of the auxiliary pile 12 and the column 11 can be aligned or not aligned.

[0076] Furthermore, referring to Figure 8 , a single secondary pile 12 is fixedly mounted on either side of the column 11. In this embodiment, a single secondary pile 12 can be fixedly mounted on any sidewall of the column 11, depending on the contact area between the secondary pile 12 and the soil. If the required contact area of ​​the secondary pile 12 is large, the sidewall of the column 11 with the smallest area should be selected for attachment.

[0077] Further, referring to Figure 9, there are two or more auxiliary piles 12, which are fixedly installed on any two sides or the same side of the column 11. Specifically, there are multiple installation forms of two or more auxiliary piles 12 and the column 11. Two or more auxiliary piles 12 can be installed on any two sides of the column 11, or fixedly installed on the same side of the column 11. When two or more auxiliary piles 12 are located on the same side of the column 11, two or more auxiliary piles 12 can be fixedly connected to the same side wall of the column 11, or two or more auxiliary piles 12 can be connected in sequence. The specific number of auxiliary piles 12 can be selected according to the contact area between the auxiliary piles 12 and the soil and the project requirements. Even the sizes of multiple auxiliary piles 12 can be different, as long as the pull-out force of the column 11 and the auxiliary piles 12 meet the pull-out force test.

[0078] Preferably, the cross-sections of the upright column 11 and the auxiliary pile 12 are any one of H-shaped, C-shaped, I-shaped, cross-shaped, L-shaped, T-shaped or rectangular.

[0079] Embodiment 3: With reference to FIG. 4 to FIG. 9 , the present invention further provides a photovoltaic support, comprising the pile foundation 1 in any of the above embodiments.

[0080] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A photovoltaic support pile foundation construction method, characterized in that: include: Conduct pull-out force test to obtain the actual friction coefficient of the area to be installed; Prefabricate the columns simultaneously with or before carrying out the pull-out test; prefabricating secondary piles after performing the pull-out test; The auxiliary pile is fixedly connected to the column to enhance the pulling force of the column.

2. A photovoltaic support pile foundation construction method according to claim 1, characterized in that: The method of fixedly connecting the auxiliary pile to the column comprises: The upright column and the auxiliary pile are fixedly connected and buried together in the area to be installed, or the upright column and the auxiliary pile are buried separately in the area to be installed and then fixedly connected.

3. A photovoltaic support pile foundation construction method according to claim 1 or 2, characterized in that: Before the auxiliary pile is fixedly connected to the column, the column and the auxiliary pile are tested, and the testing process includes: Drive single piles, welded integrated piles and bolted integrated piles respectively, and record the time required for driving to the same depth and the deformation of the pile head; Pull out the single pile, welded integrated pile and bolted integrated pile respectively, and record the actual minimum pulling force value.

4. A photovoltaic support pile foundation construction method according to claim 1 or 2, characterized in that: The design of the column specifically includes: Preliminarily calculating the theoretical pull-out force of the column, and obtaining the contact area between the column and the soil according to the theoretical pull-out force; Based on the contact area between the column and the soil and the theoretical pull-out force of the column, the Theory buried deep; The actual burial depth of the column is determined according to the theoretical burial depth of the column, and the actual burial depth of the column is less than the theoretical burial depth.

5. A photovoltaic support pile foundation construction method according to claim 4, characterized in that: The design process of the secondary pile includes: Determining an actual pull-out force of the column based on an actual buried depth of the column and an actual friction coefficient of the area to be installed; Calculating the difference between the theoretical pull-out force and the actual pull-out force, i.e., the auxiliary pile pull-out force; The contact area between the auxiliary pile and the soil is calculated based on the pull-out force of the auxiliary pile and the actual friction coefficient of the area to be installed.

6. A pile foundation, characterized in that: include: A column is prefabricated at the same time or before the pull-out force test, and the column has an embedded end and an assembly end, the embedded end can be buried in the soil to fix the column; the assembly end is suitable for installing a bearing body; The auxiliary pile is prefabricated after the pull-out force test. The auxiliary pile is installed on the column near the embedded end, and the auxiliary pile is at least partially buried in the soil. The auxiliary pile is fixedly connected to the column to increase the contact area between the column and the soil, thereby enhancing the pull-out force of the column.

7. The pile foundation according to claim 6, characterized in that: The upright column and the auxiliary pile are both provided with an open slot, and the open slot of the upright column and the open slot of the auxiliary pile are arranged opposite to or opposite to each other.

8. The pile foundation according to claim 6, characterized in that: The upright column and the auxiliary pile are fixed by fasteners or welding.

9. The pile foundation according to any one of claims 6 to 8, characterized in that: The secondary pile at least partially overlaps with the column.

10. The pile foundation according to any one of claims 6 to 8, characterized in that: There is one auxiliary pile, and the auxiliary pile is fixedly installed on any side of the column.

11. The pile foundation according to any one of claims 6 to 8, characterized in that: There are two or more auxiliary piles, which are respectively fixedly installed on any two sides or the same side of the column.

12. The pile foundation according to any one of claims 6 to 8, characterized in that: The cross sections of the upright column and the auxiliary pile are any one of H-shaped, C-shaped, I-shaped, cross-shaped, L-shaped, T-shaped or rectangular.

13. A photovoltaic support, characterized in that: include: The pile foundation according to any one of claims 6 to 12.

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