Large-span photovoltaic support arranged on steep collapsible loess slope

Abstract

The application discloses a large-span photovoltaic support arranged on a steep collapsible loess mountain slope, and solves the problem of how to construct a support pile foundation system suitable for the collapsible loess mountain slope; a slope bottom PVC corrugated pipe pile is arranged at the slope bottom of the collapsible loess mountain slope (1), and a truss is hoisted on the slope bottom corrugated pipe pile, a middle pile foundation and the slope top corrugated pipe pile; the lower end of the truss is connected to a first triangular connecting piece (9), the upper end of the truss is connected to a second triangular connecting piece (16), and a middle triangular connecting piece (22) is connected to a large-span photovoltaic support body (24) through two clamping plates (23); X-shaped arrangement of a cable-stayed anchor cable is arranged between two adjacent trusses, and an inclined cable-stayed anchor cable is arranged between each pile foundation and the top end of the truss opposite to the foundation; and the X-shaped arrangement of the cable-stayed anchor cable and the inclined cable-stayed anchor cable enable the whole large-width support to form a stable box frame structure.

Description

Technical Field

[0001] This invention relates to a photovoltaic support structure, and more particularly to a large-span photovoltaic support structure installed on steep, collapsible loess slopes. Background Technology

[0002] With the rapid development of photovoltaic power generation, the construction of large-scale photovoltaic power stations in mountainous areas is in full swing. However, due to restrictions on protecting arable land and controlling land acquisition costs, many photovoltaic power generation companies are turning their attention to barren hillsides in order to make full use of limited mountain land resources and keep construction costs low. Therefore, the northern mountainous areas with poor vegetation have become the preferred sites for deploying large-scale photovoltaic power stations. These mountainous areas have undulating terrain with large gullies, irregular topography, and chaotic topography, and are mostly unsuitable for cultivation with low tree survival rates. These are low, barren slopes; these areas are characterized by small diurnal temperature variations, good air quality, and ample sunshine; these steep slopes are mostly composed of collapsible loess, a special type of soil characterized by fine particles, small pores, low water content, and poor permeability; macroporosity is one of the most important characteristics of collapsible loess, including intergranular pores, inter-aggregate pores, intra-aggregate pores, and particle-aggregate pores, with pore sizes generally ranging from 1 to 0.002 mm; in its natural state, collapsible loess exhibits weak plasticity and a liquid limit generally around 23%. -33%, plastic limit 15%-20%, plasticity index mostly 8-13, low water content, natural water content generally 10%-25%, often in a semi-solid or hard plastic state, saturation generally 30%-70%, very poor compaction, large pores, high porosity, often 45%-55%, void ratio 0.8-1.1, dry density often 1.3-1.5 g / cm³, weak water resistance, strong disintegration upon contact with water, small expansion, but significant shrinkage upon water loss, significant sinking upon contact with water, high permeability, due to the development of large pores and vertical joints, therefore... The soil exhibits significantly higher permeability and anisotropy than ordinary cohesive soil, along with high strength. Despite its high porosity, its compressibility remains moderate, and it possesses high shear strength. A key challenge is how to deploy photovoltaic (PV) supports on the steep slopes of collapsible loess. This is particularly true when setting up PV power stations in steep mountain valleys, where winding roads prevent access for large transport equipment and make concrete delivery difficult. Achieving a small volume of concrete for pile foundation pouring and obtaining a stable pile foundation has become a critical challenge to overcome on-site. Summary of the Invention

[0003] This invention provides a large-span photovoltaic support structure for steep, collapsible loess slopes, solving the technical problem of how to construct a support pile foundation system suitable for collapsible loess slopes.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] A large-span photovoltaic support system for steep, collapsible loess slopes includes a collapsible loess slope. At the bottom of the slope, there are PVC corrugated pipe pile foundation pits. Three micro-hole cast-in-place pile holes are arranged in a triangular pattern at the bottom of the PVC corrugated pipe pile foundation pits. Micro-hole cast-in-place pile reinforcement cages are installed in the pile holes. A PVC corrugated pipe is installed in the PVC corrugated pipe foundation pit, and a reinforcement cage is installed inside the PVC corrugated pipe. The reinforcement cage inside the PVC corrugated pipe is welded to the reinforcement cage of the micro-hole cast-in-place piles. Concrete is cast-in-place inside the PVC corrugated pipe and the pile holes. A pre-embedded steel plate is installed in the top concrete of the PVC corrugated pipe. A PVC corrugated pipe is installed at the top of the collapsible loess slope. The foundation pit for the pipe piles has three micro-hole cast-in-place pile holes arranged in a triangular pattern at the bottom of the pit. Reinforcing cages for the micro-hole cast-in-place piles are installed in these holes. A PVC corrugated pipe is installed in the foundation pit, and a reinforcing cage is installed inside the PVC corrugated pipe. The reinforcing cage inside the PVC corrugated pipe is welded to the reinforcing cage of the micro-hole cast-in-place piles. Concrete is poured into the PVC corrugated pipe and the micro-hole cast-in-place pile holes. A second embedded steel plate is installed in the top concrete of the PVC corrugated pipe. A first triangular connector is fixedly connected to the embedded steel plate, and a second triangular connector is fixedly connected to the second embedded steel plate. A large-span photovoltaic support structure is connected between the first and second triangular connectors.

[0006] A first bored pile and a second bored pile are installed side by side in the middle of the collapsible loess slope. A crushed stone cushion layer is set on the slope above the two bored piles. A concrete foundation is cast in place on the crushed stone cushion layer. A central steel plate is pre-embedded at the top of the concrete foundation. The tops of the first bored pile and the tops of the second bored pile are set in the concrete foundation. A central triangular connector is welded to the central steel plate. The central triangular connector is connected to the large-span photovoltaic support structure through two clamps.

[0007] The large-span support structure consists of 4-6 trusses. Each truss is a rectangular frame composed of a lower chord, upper chord, vertical struts, and diagonal struts. Adjacent rectangular frames are connected by X-shaped horizontal connecting rods. Purlin connecting bolts are fixedly connected to the top surface of the rectangular frames. C-shaped purlins are connected to the purlin connecting bolts, and photovoltaic modules are connected to the C-shaped purlins. Cat rod connecting angle steel seats are hinged to the lower chord.

[0008] A method for deploying a large-span photovoltaic support system on a steep hillside, characterized by the following steps:

[0009] The first step involves excavating a PVC corrugated pipe pile foundation pit at the bottom of a collapsible loess slope. The pit should have a diameter greater than 800 mm and a depth of 1000-1500 mm. Three micro-hole cast-in-place pile holes are drilled at the bottom of the pit in a triangular arrangement. Reinforcing cages for the micro-hole cast-in-place piles are installed in the holes. A PVC corrugated pipe is then installed in the foundation pit, with its top end 200 mm above the slope surface. A reinforcing cage is installed inside the PVC corrugated pipe and welded to the micro-hole cast-in-place pile reinforcing cage. A pre-embedded steel plate is tied to the top of the reinforcing cage. Finally, concrete is poured to form the PVC corrugated pipe pile.

[0010] The second step involves excavating a PVC corrugated pipe pile foundation pit at the top of the collapsible loess slope. The pit should have a diameter greater than 800 mm and a depth of 1000-1500 mm. Three micro-hole cast-in-place pile holes are drilled at the bottom of the pit, arranged in a triangular pattern. A reinforcing cage for the micro-hole cast-in-place pile is installed in each of these holes. A PVC corrugated pipe is then installed in the foundation pit, with its top end 200 mm above the slope surface. A reinforcing cage is installed inside the PVC corrugated pipe and welded to the micro-hole cast-in-place pile reinforcing cage. A second pre-embedded steel plate is then tied to the top of the micro-hole cast-in-place pile reinforcing cage, and concrete is poured to form the corrugated pipe pile.

[0011] The third step involves setting up the first and second bored piles side by side in the middle of the collapsible loess slope. A crushed stone cushion layer is set on the slope above the two bored piles. A concrete foundation is cast in place on the crushed stone cushion layer. A central steel plate is pre-embedded at the top of the concrete foundation. The tops of the first and second bored piles are set in the concrete foundation to form the central pile foundation.

[0012] Step 4: Weld the first triangular connector to the pre-embedded steel plate; weld the second triangular connector to the second pre-embedded steel plate; weld the middle triangular connector to the middle steel plate.

[0013] Step 5: Hoist a truss onto the corrugated pipe piles at the bottom of the slope, the pile foundation in the middle, and the corrugated pipe piles at the top of the slope; the lower end of a truss is connected to the first triangular connector, the upper end of a truss is connected to the second triangular connector, and the middle triangular connector is connected to the large-span photovoltaic support body through two clamps.

[0014] Step 6: Repeat steps 1 to 5 to complete the installation of each truss that is set up in parallel.

[0015] Step 7: Install X-shaped inclined anchor cables between two adjacent trusses. The ends of the inclined anchor cables are connected to the trusses by L-shaped angle steel, which is hinged to the lower chord of the truss by a pin.

[0016] Step 8: Install inclined tie anchors between each pile foundation and the top of the truss diagonally opposite the foundation. Install turnbuckles in the inclined tie anchors. Through the X-shaped arrangement of tie anchors and inclined tie anchors, the entire wide support forms a stable box frame structure.

[0017] Step 9: Fix the purlin connecting bolts to the top surface of the rectangular frame, connect the C-shaped purlins to the purlin connecting bolts, and install the photovoltaic modules on the C-shaped purlins.

[0018] To more effectively utilize mountainous terrain, this invention constructs a support frame for large-span photovoltaic modules using multiple trusses arranged in parallel. Large-diameter corrugated pipes are used as formwork for the pipe piles, combining them with micro-hole cast-in-place piles. This significantly reduces the amount of concrete poured for the pile foundation, solving the problem of difficult concrete transportation in steep mountainous terrain. The large-diameter corrugated pipe pile foundation uses three micro-hole cast-in-place piles as anchor bars, extending into the rock of the bearing layer, achieving stable installation of the large-span support and providing wind uplift resistance, ensuring the safe operation of the photovoltaic modules. Adjacent trusses are connected by X-shaped anchor rods and diagonal anchor cables, forming a stable box-frame structure that effectively resists wind uplift. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the structure of the present invention;

[0020] Figure 2 is a schematic diagram of the PVC corrugated pipe pile foundation pit 3 at the bottom of the slope according to the present invention;

[0021] Figure 3 is a schematic diagram of the structure of a truss of the present invention in a side view;

[0022] Figure 4 is a schematic diagram of the structure of one truss of the present invention in a top view;

[0023] Figure 5 This is a schematic diagram of the structure of the X-shaped horizontal connecting rod 32 that connects two adjacent rectangular frames. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings:

[0025] A large-span photovoltaic support system for steep, collapsible loess slopes includes a collapsible loess slope 1, a PVC corrugated pipe pile foundation pit 3 at the bottom of the slope 1, three micro-hole cast-in-place pile holes 4 (or four or more) at the bottom of the PVC corrugated pipe pile foundation pit 3, arranged in a triangular pattern, with a micro-hole cast-in-place pile reinforcement cage 5 installed in each hole 4, and a PVC corrugated pipe 6 installed in the PVC corrugated pipe pile foundation pit 3. A reinforcing cage 7 is installed inside the corrugated pipe 6 at the bottom of the slope, and is welded to the reinforcing cage 5 of the micro-hole cast-in-place pile. Concrete is poured in place inside the PVC corrugated pipe 6 at the bottom of the slope and in the pile hole 4 of the micro-hole cast-in-place pile. A pre-embedded steel plate 8 is installed in the top concrete inside the PVC corrugated pipe 6 at the bottom of the slope, thus constructing a large reinforced concrete pile foundation set in collapsible loess. The pile foundation is about 1 meter high and is connected to the bearing layer or rock below by three micro-hole cast-in-place piles at the lower end, thereby saving concrete pouring. The construction volume was increased, and the stability of the pile foundation was achieved. A PVC corrugated pipe pile foundation pit 10 was set at the top of the collapsible loess slope 1. Three micro-hole cast-in-place pile holes 11 were set at the bottom of the PVC corrugated pipe pile foundation pit 3, arranged in a triangular pattern. A micro-hole cast-in-place pile reinforcement cage 12 was installed in each of the micro-hole cast-in-place pile holes 11. A PVC corrugated pipe 13 was installed in the PVC corrugated pipe pile foundation pit 10, and reinforcement bars were installed inside the PVC corrugated pipe 13. The steel cage 14 inside the PVC corrugated pipe at the top of the slope is welded together with the steel cage 12 of the micro-hole cast-in-place pile at the top of the slope. Concrete is poured in place inside the PVC corrugated pipe 13 at the top of the slope and in the pile hole 11 of the micro-hole cast-in-place pile at the top of the slope. A second embedded steel plate 15 is set in the concrete at the top of the PVC corrugated pipe 13 at the top of the slope. A first triangular connector 9 is fixedly connected to the embedded steel plate 8, and a second triangular connector 16 is fixedly connected to the second embedded steel plate 15. A large-span photovoltaic support body 24 is connected between the first triangular connector 9 and the second triangular connector 16.

[0026] A first bored pile 17 and a second bored pile 18 are installed side by side in the middle of the collapsible loess slope 1. A crushed stone cushion layer 19 is set on the slope above the two bored piles. A concrete foundation 20 is cast in place on the crushed stone cushion layer 19. A central steel plate 21 is pre-embedded at the top of the concrete foundation 20. The tops of the first bored pile 17 and the tops of the second bored pile 18 are set in the concrete foundation 20. A central triangular connector 22 is welded to the central steel plate 21. The central triangular connector 22 is connected to the large-span photovoltaic support body 24 through two clamps 23.

[0027] The large-span support structure 24 is composed of 4-6 trusses. Each truss is a rectangular frame consisting of a lower chord 28, an upper chord 29, vertical struts 31, and diagonal struts 30. Adjacent rectangular frames are connected by X-shaped horizontal connecting rods 32. Purlin connecting bolts 25 are fixedly connected to the top surface of the rectangular frames. C-shaped purlins 26 are connected to the purlin connecting bolts 25, and photovoltaic modules 27 are connected to the C-shaped purlins 26. Cat rod connecting angle steel seats 2 are hinged to the lower chord 28. The angle of the anchor rods can be easily adjusted through the hinged cat rod connecting angle steel seats 2 to achieve the tensioning of the anchor rods on the two trusses. In particular, the diagonal anchor cables are set on the diagonal of the box frame, which plays a crucial role in the stability of the box frame. The turnbuckles on them facilitate the tensioning adjustment of the anchor cables.

[0028] A method for deploying a large-span photovoltaic support system on a steep hillside, characterized by the following steps:

[0029] Step 1: Excavate a PVC corrugated pipe pile foundation pit 3 at the bottom of the slope of the collapsible loess hillside 1. The diameter of the PVC corrugated pipe pile foundation pit 3 is greater than 800 mm and the depth is 1000-1500 mm. Drill three micro-hole cast-in-place pile holes 4 at the bottom of the pit. The three micro-hole cast-in-place pile holes 4 are arranged in a triangle. Install micro-hole cast-in-place pile reinforcement cages 5 in the micro-hole cast-in-place pile holes 4. Install a PVC corrugated pipe 6 at the bottom of the slope in the PVC corrugated pipe pile foundation pit 3. Make the top of the PVC corrugated pipe 6 200 mm higher than the slope surface. Install a reinforcement cage 7 inside the PVC corrugated pipe 6. Weld the reinforcement cage 7 inside the PVC corrugated pipe 6 to the reinforcement cage 5 of the micro-hole cast-in-place pile. Tie a pre-embedded steel plate 8 to the top of the reinforcement cage 7 inside the PVC corrugated pipe 6. Finally, pour concrete to form the PVC corrugated pipe pile at the bottom of the slope.

[0030] The second step involves excavating a PVC corrugated pipe pile foundation pit 10 at the top of the collapsible loess slope 1. The pit 10 has a diameter greater than 800 mm and a depth of 1000-1500 mm. Three micro-hole cast-in-place pile holes 11 are drilled at the bottom of the pit, arranged in a triangular pattern. Reinforcing cages 12 for the micro-hole cast-in-place piles are installed within these holes 11. Finally, the PVC corrugated pipe piles are installed... A PVC corrugated pipe 13 is installed in the foundation pit 10, with the top of the PVC corrugated pipe 13 being 200 mm above the slope surface. A steel cage 14 is installed inside the PVC corrugated pipe 13. The steel cage 14 is welded to the steel cage 12 of the micro-hole cast-in-place pile. A second pre-embedded steel plate 15 is tied to the top of the steel cage 12 of the micro-hole cast-in-place pile. Concrete is then poured to form a corrugated pipe pile.

[0031] The third step involves setting up a first bored pile 17 and a second bored pile 18 side by side in the middle of the collapsible loess slope 1. A crushed stone cushion layer 19 is set on the slope above the two bored piles. A concrete foundation 20 is cast in place on the crushed stone cushion layer 19. A central steel plate 21 is pre-embedded at the top of the concrete foundation 20. The tops of the first bored pile 17 and the tops of the second bored pile 18 are set in the concrete foundation 20 to form a central pile foundation.

[0032] Step 4: Weld the first triangular connector 9 onto the pre-embedded steel plate 8; weld the second triangular connector 16 onto the second pre-embedded steel plate 15; weld the middle triangular connector 22 onto the middle steel plate 21.

[0033] Step 5: Hoist a truss onto the corrugated pipe piles at the bottom of the slope, the pile foundation in the middle, and the corrugated pipe piles at the top of the slope; the lower end of the truss is connected to the first triangular connector 9, the upper end of the truss is connected to the second triangular connector 16, and the middle triangular connector 22 is connected to the large-span photovoltaic support body 24 through two clamps 23.

[0034] Step 6: Repeat steps 1 to 5 to complete the installation of each truss that is set up in parallel.

[0035] Step 7: Install X-shaped inclined anchor cables between two adjacent trusses. The ends of the inclined anchor cables are connected to the trusses by L-shaped angle steel 2. The L-shaped angle steel 2 is hinged to the lower chord 28 of the truss by a pin.

[0036] Step 8: Install inclined tie anchors between each pile foundation and the top of the truss diagonally opposite the foundation. Install turnbuckles in the inclined tie anchors. Through the X-shaped arrangement of tie anchors and inclined tie anchors, the entire wide support forms a stable box frame structure.

[0037] Step 9: Fix the purlin connecting bolts 25 to the top surface of the rectangular frame, connect the C-shaped purlins 26 to the purlin connecting bolts 25, and install the photovoltaic modules 27 on the C-shaped purlins 26.

Claims

1. A large-span photovoltaic support structure for installation on steep, collapsible loess slopes, comprising a collapsible loess slope (1), characterized in that, At the bottom of a collapsible loess hillside (1), a PVC corrugated pipe pile foundation pit (3) is set up. At the bottom of the PVC corrugated pipe pile foundation pit (3), three micro-hole cast-in-place pile holes (4) are set up. The three micro-hole cast-in-place pile holes (4) are arranged in a triangular pattern. A micro-hole cast-in-place pile reinforcement cage (5) is set up in the micro-hole cast-in-place pile hole (4). A PVC corrugated pipe (6) is set up in the PVC corrugated pipe pile foundation pit (3). A PVC corrugated pipe (6) is set up in the PVC corrugated pipe (6). The steel cage (7) inside the PVC corrugated pipe at the bottom of the slope is welded together with the steel cage (5) of the micro-hole cast-in-place pile. Concrete is poured in the PVC corrugated pipe (6) at the bottom of the slope and in the pile hole (4) of the micro-hole cast-in-place pile. A pre-embedded steel plate (8) is set in the concrete at the top of the PVC corrugated pipe (6) at the bottom of the slope. A PVC corrugated pipe pile foundation pit (10) is set at the top of the slope of the collapsible loess hillside (1). Three micro-hole cast-in-place piles are set at the bottom of the PVC corrugated pipe pile foundation pit (10) at the top of the slope. Three micro-hole cast-in-place pile holes (11) are arranged in a triangular pattern. A micro-hole cast-in-place pile reinforcement cage (12) is installed in the micro-hole cast-in-place pile hole (11). A PVC corrugated pipe (13) is installed in the PVC corrugated pipe pile pit (10) at the top of the slope. A reinforcement cage (14) is installed inside the PVC corrugated pipe (13). The reinforcement cage (14) inside the PVC corrugated pipe is welded to the micro-hole cast-in-place pile reinforcement cage (12). Together, concrete is poured in the PVC corrugated pipe (13) at the top of the slope and in the pile hole (11) of the micro-hole grouting pile at the top of the slope. A second pre-embedded steel plate (15) is set in the concrete at the top of the PVC corrugated pipe (13) at the top of the slope. A first triangular connector (9) is fixedly connected to the pre-embedded steel plate (8), and a second triangular connector (16) is fixedly connected to the second pre-embedded steel plate (15). A large-span photovoltaic support body (24) is connected between the first triangular connector (9) and the second triangular connector (16).

2. A large-span photovoltaic support structure for installation on steep, collapsible loess slopes, as described in claim 1, is characterized in that... A first bored pile (17) and a second bored pile (18) are set up side by side in the middle of the collapsible loess hillside (1). A crushed stone cushion layer (19) is set on the slope above the two bored piles. A concrete foundation (20) is cast in place on the crushed stone cushion layer (19). A central steel plate (21) is pre-embedded at the top of the concrete foundation (20). The top of the first bored pile (17) and the top of the second bored pile (18) are set in the concrete foundation (20). A central triangular connector (22) is welded to the central steel plate (21). The central triangular connector (22) is connected to the large-span photovoltaic support body (24) through two clamps (23).

3. A large-span photovoltaic support structure for installation on steep, collapsible loess slopes, as described in claim 2, is characterized in that... The large-span support structure (24) is composed of 4-6 trusses. Each truss is a rectangular frame composed of a lower chord (28), an upper chord (29), a vertical strut (31), and a diagonal strut (30). An X-shaped horizontal connecting rod (32) connects adjacent rectangular frames. A purlin connecting bolt (25) is fixedly connected to the top surface of the rectangular frame. A C-shaped purlin (26) is connected to the purlin connecting bolt (25). A photovoltaic module (27) is connected to the C-shaped purlin (26). A cat rod connecting angle steel seat (2) is hinged to the lower chord (28).

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