Photovoltaic flexible support structure in soft soil area

Abstract

The utility model discloses a photovoltaic flexible support structure in a soft soil area, the photovoltaic flexible support structure comprises raft foundations, steel supports and inhaul cables, the two raft foundations are arranged at intervals in the first axis direction, and each raft foundation is provided with a plurality of steel supports in the second axis direction; the multiple steel supports located on the same raft foundation are connected together through a connecting beam, the inhaul cable extends in the first axis direction, and the two ends of the inhaul cable are connected to the steel supports on the two raft foundations respectively. Foundation piles are arranged in the foundation, and the raft foundation is supported on the foundation piles. The raft foundation structure is composed of the raft foundation, the pile structures and the steel supports and has the advantages of being large in rigidity, good in integrity and high in horizontal displacement control capacity. Due to the fact that the raft foundation is of a cast-in-place structure and has the advantages of being good in integrity, high in long-term stability and large in structural safety redundancy, anchor rods are omitted, the problem that the anchor rods extend out of a set area is avoided, the problem that side spans occupy extra space outwards is avoided, and the land utilization rate is increased.

Description

Technical Field

[0001] This utility model relates to a flexible photovoltaic support structure for soft soil regions. Background Art

[0002] To expand the use of solar energy, different types of areas are being developed in a comprehensive manner. Soft soil areas such as fish ponds and tidal flats are being used as photovoltaic sites without affecting fishery resources, and flexible supports are being used to install photovoltaic panels.

[0003] The photovoltaic flexible support system transfers the load to the side span structure through pre-tensioned cables. Due to the large prestress in the cables, the side span structure needs to bear both vertical and horizontal loads simultaneously, and the loads are dynamic loads, which requires high long-term stability of the structure.

[0004] Side span structures typically employ a single pile or a single pile plus anchor (cable) scheme. While a single pile can meet the vertical bearing capacity requirements, its large horizontal displacement makes it difficult to satisfy the deformation requirements of relevant codes. Larger diameter piles are needed to meet the horizontal deformation specifications, leading to higher construction difficulty and cost. The single pile plus anchor (cable) scheme utilizes pile foundations for vertical bearing capacity and inclined anchors for horizontal bearing capacity, leveraging the advantages of both. However, in this scheme, the piles and anchors bear loads independently, resulting in weak structural deformation control, poor overall integrity, and often long anchors that are difficult to control in terms of construction quality. Furthermore, the side span requires significant additional space, leading to low land utilization.

[0005] Given the above reasons, how to complete the side span structure of the photovoltaic flexible support with high quality remains a problem that needs to be solved. Utility Model Content

[0006] To address the issues of high construction costs and difficulty in quality control in existing technologies, this application first proposes a flexible photovoltaic support structure for soft soil regions. The structure includes a raft foundation, steel supports, and cables. Two raft foundations are spaced apart along a first axis. Several steel supports are installed on each raft foundation along a second axis. These steel supports on the same raft foundation are connected by a connecting beam. The cables extend along the first axis, with both ends connected to the steel supports on the two raft foundations. Foundation piles are present in the ground, and the raft foundations are supported on these piles. Both the first and second axes extend horizontally and are perpendicular to each other.

[0007] In this application, a raft foundation and pile structure are used at the bottom, and a steel structure support is used at the top, which has the advantages of high rigidity, good integrity, and strong ability to control horizontal displacement. The raft foundation, being a cast-in-place structure, has the advantages of good integrity, strong long-term stability, and large structural safety redundancy. This application eliminates anchor rods, avoiding the problem of anchor rods extending outwards into the designated area due to excessive length, and avoiding the problem of side spans occupying extra space, thus improving land utilization.

[0008] Specifically, at least one foundation pile includes a cement-soil pile and a precast pile inserted within the cement-soil pile. This design can ensure the strength of the pile body while increasing the end bearing capacity and the peripheral friction. In existing technologies, precast piles or cast-in-place piles are generally used as foundation piles. When using precast piles alone, the pile diameter is generally small. While this can meet the bearing capacity requirements in areas with harder soil, it is difficult to meet the bearing capacity requirements when constructing in soft soil areas such as tidal flats and fishponds, or when installing photovoltaic facilities using methods such as solar-fishery integration. Generally, large-diameter mixing piles are required as foundation piles. However, mixing piles have high construction costs and long construction periods. Furthermore, when constructing in soft soil areas such as tidal flats and fishponds, steel cylinders are required to prevent the pile hole from collapsing, leading to increased construction costs. In this application, cement-soil piles are used to ensure the outer diameter of the foundation pile, so that the foundation pile has a larger end bearing capacity and peripheral friction, while precast piles are used to ensure the strength of the foundation pile. Composite foundation piles formed by cement-soil piles and precast piles have advantages over cast-in-place piles of equal diameter or combined piles formed by multiple precast piles in terms of ease of construction and low cost. They can also reduce the soil squeezing effect caused by using only precast piles.

[0009] Preferably, the cement-soil pile is a cement-soil mixing pile or a cement-soil jet grouting pile; the precast pile is a PHC pipe pile or a steel pile.

[0010] Specifically, the steel support frame is triangular in shape and includes a first support column and a second support column. The lower ends of the first and second support columns are spaced apart along a first axis, and the top ends of the first and second support columns are fixed together. This triangular steel support frame reduces the amount of steel used while meeting strength requirements.

[0011] Furthermore, to facilitate the erection of the connecting beam, corbels are installed on the steel support to support the connecting beam.

[0012] Specifically, the steel supports on the two raft foundations are paired one-to-one, and the corresponding two steel supports form a support group. This design effectively prevents the steel supports from tilting or even collapsing due to the imbalance of the component forces in the second axis direction.

[0013] Specifically, there is a cable on each side of the second axis direction on both sides of the support group, or the two ends of the cable pass through two steel supports of the same support group respectively. Different cable arrangement methods are selected according to different load requirements.

[0014] Specifically, to ensure strong stability in soft soil areas, each raft foundation is provided with at least two rows of foundation piles along the first axis, and each row of foundation piles includes several foundation piles spaced apart along the second axis. Among the foundation piles corresponding to each raft foundation, the foundation piles facing the other raft foundation bear the compressive force, while the foundation piles away from the other raft foundation bear the tensile force. The foundation piles corresponding to the two raft foundations form a pile group structure, which jointly bears the horizontal load. The force transmission path is clear, the stress is well-defined, the structural redundancy is large, and the overall safety is high. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0016] Figure 2 yes Figure 1 A schematic diagram of the AA direction.

[0017] Figure 3 yes Figure 1 A schematic diagram of the BB direction.

[0018] Figure 4 yes Figure 2 Enlarged view of section C.

[0019] Figure 5 This is a schematic diagram of the first type of raft foundation.

[0020] Figure 6 This is the second schematic diagram of a raft foundation.

[0021] Figure 7 This is a schematic diagram of another embodiment of the present invention. DETAILED DESCRIPTION

[0022] See Figures 1-4 In the attached diagram, the first arrow X points to the direction of the first axis, and the second cylinder Y points to the direction of the second axis. Both the first and second axis directions extend horizontally and are perpendicular to each other.

[0023] A flexible photovoltaic support structure for soft soil regions includes a raft foundation, steel supports, and cables 50. Two raft foundations are spaced apart along a first axis; for ease of description, these two raft foundations are referred to as the first raft foundation 101 and the second raft foundation 102, respectively. Ten steel supports are installed on each of the two raft foundations along the second axis; for ease of description, the steel supports on the first raft foundation 101 are referred to as the first steel supports 201, and the steel supports on the second raft foundation 102 are referred to as the second steel supports 202. Figure 1 The diagram shows five steel supports on each raft foundation. In actual construction, the number of steel supports can be set according to specific requirements.

[0024] In this embodiment, the first steel support 201 and the second steel support 202 are in one-to-one correspondence, and the corresponding first steel support 201 and second steel support 202 form a support group. The first steel support 201 and the second steel support 202 in the same support group are spaced apart along the first axis. That is, the steel supports on the two raft foundations are in one-to-one correspondence, and the corresponding two steel supports form a support group.

[0025] It is understood that in other embodiments, the first steel bracket 201 and the second steel bracket 202 do not need to correspond one-to-one; please refer to the following for details. Figure 7 ,exist Figure 7 In the first axial direction, the first steel support 201 is positioned directly opposite the middle of two adjacent second steel supports 202.

[0026] In this embodiment, ten first steel supports located on the first raft foundation are connected together by a first connecting beam 311, and ten second steel supports located on the second raft foundation are connected together by a second connecting beam 312. It is understood that it is also possible to connect only two, five, or eight steel supports on the same raft foundation together by a single connecting beam. Of course, when there are fewer than or more than ten steel supports on each raft foundation, the number of steel supports connected by each connecting beam can be determined according to the specific circumstances.

[0027] The foundation has foundation piles 40 in the ground, and the raft foundation is supported on the foundation piles. In this embodiment, the foundation piles 40 include cement-soil mixing piles 41 and PHC pipe piles 42 inserted in the cement-soil mixing piles 41. It can be understood that in other embodiments, cement-soil jet grouting piles can be used instead of cement-soil jet grouting piles, and steel piles such as steel pipe piles and H-beam piles can be used instead of PHC pipe piles.

[0028] The first steel support 201 and the second steel support 202 have the same structure and are symmetrically arranged. The following description uses the first steel support 201 as an example to illustrate the specific structure of the steel support. Please refer to [link / reference]. Figure 2 and Figure 4The first steel support is triangular in shape and includes a first support column 21 and a second support column 22. The second support column 22 is located on the side of the first support column facing the second steel support. The first support column 21 is a vertically extending column, while the second support column 22 is inclined. The lower ends of the first and second support columns are spaced apart along the first axis, and their top ends are bolted together. To improve the stability of the first steel support, three connecting rods are provided between the first and second support columns: a first connecting rod 231, a second connecting rod 232, and a third connecting rod 233. The first connecting rod 231 extends vertically, the second connecting rod 232 extends inclinedly, and the third connecting rod 233 extends horizontally.

[0029] A steel bracket 24 is provided on the side of the first steel support 201 opposite to the second steel support 202. This steel bracket 24 is welded to the side of the first support column opposite to the second support column. Alternatively, in another embodiment, bolts can be used to connect the steel bracket 24 to the first support column. This steel bracket 24 supports the first connecting beam 311. The first connecting beam 311 is bolted to the side of the first support column opposite to the second support column, thus securely connecting the first connecting beam 311 to the first steel support. When installing the first connecting beam, it is first placed on the steel bracket, then its height is adjusted, and finally bolted to the first support column. In this embodiment, the first connecting beam is composed of two parallel H-beams, and a clamp-type anchor 32 is provided on the side of the first connecting beam opposite to the first steel support.

[0030] Please refer to the structure of the second steel support 202. Figure 3 I will not go into details. Figure 2 , Figure 3 The mark 100 in the diagram represents the ground.

[0031] The cable 50 extends along the first axis, and its two ends are locked to the first connecting beam and the second connecting beam via clamp-type anchors 32, respectively. That is, the two ends of the cable are respectively connected to the steel supports on the two raft foundations. In this embodiment, there is a cable on both sides of the second axis direction of each support group.

[0032] It is understood that, in another embodiment, the two ends of the cable can be passed through two steel supports of the same support group and locked by a clamp-type anchor. In this case, it is necessary to set a channel for passing the cable through the first steel support and the second steel support.

[0033] It is understood that, in another embodiment, the first support column 21 and the second support column 22 of the first steel bracket may both be inclined, with the first support column inclined toward the second support column and the second support column inclined toward the first support column. Alternatively, the second support column may be vertically positioned, and the first support column may be inclined toward the second support column.

[0034] In this embodiment, the two raft foundations have identical structures. The following description uses the first raft foundation 101 as an example to illustrate the raft foundation. Please refer to [link / reference]. Figure 5 The first raft foundation 101 includes a pile cap 11, a longitudinal ground beam 12, and a transverse ground beam 13. Two rows of foundation piles 40 are arranged along the first axis, each row of foundation piles 40 includes 10 foundation piles, and a pile cap 11 is poured on each foundation pile. Along the first axis, a transverse ground beam 13 is poured between two adjacent pile caps 11, and along the second axis, a longitudinal ground beam 12 is poured between two adjacent pile caps. A base slab 14 is poured within the space enclosed by the adjacent longitudinal ground beams 12 and transverse ground beams 13.

[0035] There is no specific requirement for the number of foundation piles; the number should be determined based on the load-bearing capacity of the photovoltaic flexible support structure. Please refer to [link / reference]. Figure 6 In the attached diagram, three rows of foundation piles are arranged along the first axis.

[0036] The construction method for the aforementioned flexible photovoltaic support structure is described below, and the method includes the following steps:

[0037] (1) Construction of foundation piles: Cement-soil mixing piles 41 are constructed at the set position using a mixing pile machine. Before the cement-soil mixing piles have completed their initial setting, PHC pipe piles 42 are inserted into the cement-soil mixing piles 41 to form foundation piles 40.

[0038] (2) Construction of raft foundation: First, pour the pile cap 11 on top of each foundation pile 40, then pour the bottom beam including the transverse ground beam and the longitudinal ground beam in sequence, and finally pour the bottom slab to complete the construction of the first raft foundation and the second valve disc foundation.

[0039] (3) Install the first steel bracket 201 on the first raft foundation and install the second steel bracket 202 on the second raft foundation.

[0040] (4) Install steel brackets on the first steel bracket and the second steel bracket respectively, and erect the first connecting beam and the second connecting beam.

[0041] (5) Install the cable.

Claims

1. A flexible photovoltaic support structure for soft soil regions, characterized in that, The system includes a raft foundation, steel supports, and cables. Two raft foundations are spaced apart along a first axis. Several steel supports are installed on each raft foundation along a second axis. The steel supports on the same raft foundation are connected together by a connecting beam. The cables extend along the first axis, and the two ends of the cables are connected to the steel supports on the two raft foundations respectively. The foundation has foundation piles in the ground, and the raft foundation is supported on the foundation piles. Both the first axis and the second axis extend horizontally and are perpendicular to each other.

2. The photovoltaic flexible support structure according to claim 1, characterized in that, At least one foundation pile includes a cement-soil pile and a precast pile inserted into the cement-soil pile.

3. The photovoltaic flexible support structure according to claim 2, characterized in that, The cement-soil pile is either a cement-soil mixing pile or a cement-soil jet grouting pile; the precast pile is either a PHC pipe pile or a steel pile.

4. The photovoltaic flexible support structure according to claim 1, characterized in that, The steel support is triangular in shape and includes a first support column and a second support column. The lower ends of the first support column and the second support column are spaced apart along the first axis, and the top ends of the first support column and the second support column are fixed together.

5. The photovoltaic flexible support structure according to claim 1, characterized in that, Brackets are installed on the steel frame to support the connecting beam.

6. The photovoltaic flexible support structure according to claim 1, characterized in that, The steel supports on the two raft foundations correspond one-to-one, and the two corresponding steel supports form a support group.

7. The photovoltaic flexible support structure according to claim 6, characterized in that, There is a cable on each side of the second axis direction on both sides of the support group, or the two ends of the cable pass through two steel supports of the same support group respectively.

8. The photovoltaic flexible support structure according to claim 1, characterized in that, For each raft foundation, at least two rows of foundation piles are provided along the first axis direction, and each row of foundation piles includes several foundation piles spaced apart along the second axis direction.

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