Photovoltaic anchor pile device for improving the stability of silt soil

Abstract

This invention relates to a photovoltaic anchor pile device for improving the stability of silty soil burial, belonging to the field of photovoltaic anchor technology. It includes an outer steel cage with a central placement cavity inside. An inner grouting rod is installed inside the central placement cavity. The central placement cavity includes a top guide ring, with multiple sets of assembly auxiliary rings installed at its lower end. The lowest assembly auxiliary ring is fixedly connected to the bottom of the outer steel cage. Multiple gripping rods are slidably inserted into each set of assembly auxiliary rings. Each gripping rod has a resilient, expandable wing at both ends and a grouting channel inside. The inner grouting rod has a grouting channel inside, a top cone at its lower end, grouting holes on its sidewall, and a mounting base fixedly installed at its upper end. This invention solves the problems of current photovoltaic anchor pile foundations easily shifting in silty soil and being unable to adapt to pile foundation pits of different depths and different types of photovoltaic supports.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic anchor technology, specifically relating to a photovoltaic anchor pile device that improves the stability of burying in silty soil. Background Technology

[0002] There is a large demand for photovoltaic projects in the Loess Plateau and surrounding mountainous areas of my country, with broad application prospects. The soil in this geological area is mostly silt, which is a type of fine-grained soil between sand and clay. In engineering, it specifically refers to soil with a particle size > 0.075mm ≤ 50% and a plasticity index Ip ≤ 10.

[0003] When constructing photovoltaic anchor pile foundations in silty soil, the traditional pile foundations are prone to vertical settlement and horizontal displacement after construction due to the characteristics of silty soil (softening when exposed to water, weak cohesion, low shear strength, and easy corrosion). This results in the photovoltaic anchor pile foundation construction being significantly affected by accuracy.

[0004] When constructing photovoltaic anchor pile foundations in different types of silty soil, the required depth of the pile foundation pit varies. Existing photovoltaic anchor pile foundations will weld the main steel reinforcement structure according to the depth of the pit and apply an anti-corrosion coating in advance. However, the internal mechanism for gripping the silty soil pit wall is mostly irregular in shape, which makes it inconvenient to weld and install according to the site, thus limiting its use.

[0005] The existing photovoltaic support brackets are of different models. After the photovoltaic anchor pile foundation is grouted, the fixed photovoltaic support bracket is installed, resulting in poor versatility. It is impossible to adjust according to the actual photovoltaic support bracket model, resulting in incompatibility with different photovoltaic support bracket models. Summary of the Invention

[0006] This invention overcomes the shortcomings of existing technologies and proposes a photovoltaic anchor pile device to improve the stability of photovoltaic anchor pile installation in silty soil. It solves the problems that current photovoltaic anchor pile foundations are prone to displacement in silty soil and cannot adapt to pile foundation pits of different depths and different types of photovoltaic supports.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0008] A photovoltaic anchor pile device for improving the stability of silty soil burial includes an outer steel cage, a central placement cavity inside the outer steel cage, and an inner grouting rod inside the central placement cavity. The central placement cavity includes a top guide ring, with multiple sets of assembly auxiliary rings installed at the lower end of the top guide ring. The lowermost assembly auxiliary ring is fixedly connected to the bottom of the outer steel cage. Multiple gripping rods are slidably inserted inside each set of assembly auxiliary rings. Each end of the gripping rod has a resilient unfolding wing, and a grouting channel is provided inside the gripping rod. The inner grouting rod has a grouting channel inside, a top cone at the lower end of the inner grouting rod, grouting holes on the side wall of the inner grouting rod, and a mounting base fixedly installed at the upper end of the inner grouting rod.

[0009] Furthermore, the outer steel cage includes straight steel bars, spiral steel bars, and a base. Six vertical straight steel bars are fixedly installed at the outer edge of the upper surface of the base, and spiral steel bars are fixedly installed outside the six straight steel bars. Two slots are provided on the base.

[0010] Furthermore, the central placement cavity also includes a guide ring and arc-shaped cards; the lower end of the top guide ring is fixedly connected to the uppermost set of assembly auxiliary rings, and any two adjacent sets of assembly auxiliary rings are fixedly connected by a guide ring; the lower end of the lowermost assembly auxiliary ring is fixedly provided with two arc-shaped cards, which are respectively inserted into the two slots on the base.

[0011] Furthermore, each set of assembly auxiliary rings includes six auxiliary ring units stacked one on top of the other. Each auxiliary ring unit is provided with a C-shaped through groove and an internally and externally connected mounting groove. The outer openings of the mounting grooves on the six auxiliary ring units face the six straight steel bars respectively.

[0012] Furthermore, a C-shaped retaining ring is fixedly installed at both the upper and lower ends of the guide ring. The retaining ring at the upper end of the guide ring engages with the C-shaped through groove of the lowest auxiliary ring unit in the upper group of assembly auxiliary rings, and the retaining ring at the lower end of the guide ring engages with the C-shaped through groove of the highest auxiliary ring unit in the lower group of assembly auxiliary rings. A C-shaped retaining ring is also fixedly installed on the lower end face of the top guide ring, and the retaining ring at the lower end of the top guide ring engages with the C-shaped through groove of the highest auxiliary ring unit in the uppermost group of assembly auxiliary rings.

[0013] Furthermore, two arc-shaped cards are fixedly installed at the lower end of the lowest auxiliary ring unit in the lowest set of assembly auxiliary rings. Each arc-shaped card has a row of anti-slip buckles on its inner and outer sides from top to bottom. When the two arc-shaped cards are respectively inserted into the two slots on the base, the anti-slip buckles on the inner and outer sides of the arc-shaped cards are engaged with the lower opening of the slot.

[0014] Furthermore, the clamping rod is a V-shaped rod structure. The pointed end of the clamping rod in the middle extends through the mounting groove into the interior of the auxiliary ring unit, and both ends of the clamping rod extend through the mounting groove to the outside of the auxiliary ring unit. The V-shaped opening of the clamping rod faces the corresponding straight steel bar. A four-sided pyramidal top block is fixedly installed on the outside of the pointed end in the middle of the clamping rod. A grout inlet is provided on the top block. Grouting ports are arranged on the inner side of the clamping rod and at both ends of the clamping rod. The grout inlet and grouting ports are connected to the grout passage inside the clamping rod.

[0015] Furthermore, a stop block is fixedly installed on the outer side of each end of the gripping rod. Each stop block has a deployable wing rotatably mounted on it via a first pivot. A V-shaped spring is installed between the gripping rod and each deployable wing. The two ends of the spring are hinged to the inner side of the deployable wing and the outer side of the gripping rod via a second pivot. A V-shaped push-out spring is installed in the middle of the inner side of the spring. Two symmetrical fixed sleeves are fixedly installed on the inner side of the spring. The two ends of the push-out spring are hinged to the two fixed sleeves. A through shaft is rotatably mounted in the middle of the push-out spring. Both ends of the through shaft are fixedly connected to the middle of the spring.

[0016] Furthermore, the inner grouting rod is composed of multiple sets of baffles, with any two adjacent sets of baffles fixedly connected to each other; each set includes multiple baffles arranged in a circular array, and any two adjacent baffles in each set form a slot, which is connected to the grouting channel inside the inner grouting rod, and the slot forms the grouting hole.

[0017] Furthermore, a top ring is fixedly installed at the upper end of the inner grouting rod, and an outer pile is fixedly installed at the upper end of the top ring. An overflow port is provided at the connection between the outer pile and the top ring, and the overflow port is connected to the grouting channel. An installation base is fixedly installed on the top of the outer pile, and the installation base is used to fix and install the photovoltaic bracket.

[0018] The beneficial effects of this invention compared to the prior art are as follows: (1) The middle placement cavity is used to cooperate with the outer steel cage, and the grabbing rod in the assembly auxiliary ring is pushed out during the installation of the inner grouting rod. The grabbing rod passes through the straight steel bar and pushes into the inner wall of the foundation pit to grab the soil. At the same time, the grouting channel evenly distributed in the grabbing rod injects the concrete slurry into the inserted silty soil. After solidification, it increases the pouring strength of the outer steel cage and ensures the stability of the outer steel cage after installation in the silty soil foundation pit.

[0019] (2) The springs on both sides of the clamping rod can push the unfolding wing to unfold quickly when it loses its limit. When unfolding, the sharp corner structure on the side of the unfolding wing is pushed into the silt under the impact force of the pop-out, so as to grasp the soil layer, increase the area of ​​silt soil grasping, and increase the strength of soil grasping. After the outer steel cage is poured, if the silt soil undergoes geological changes, the unfolding of the unfolding wing can greatly improve the grasping force after the photovoltaic anchor pile is formed.

[0020] (3) By assembling the auxiliary ring and the guide ring, the central placement cavity can be formed on-site according to the depth of the photovoltaic pile foundation. During installation, the corresponding number of clamping rods can be selected to ensure flexible assembly and installation between the clamping rods and the auxiliary ring, thereby improving the assembly flexibility of the central placement cavity.

[0021] (4) By pushing down the top cone of the inner grouting rod, the grabbing rod can be quickly deployed in conjunction with the middle placement cavity. When the inner grouting rod is lowered, the top cone at its lower end will hit the top block to achieve the overall ejection of the grabbing rod. When ejecting, the ejection length of the grabbing rod is limited by straight steel bars. When the inner grouting rod gradually moves downward, all the pre-installed grabbing rods are ejected and installed. At the same time, the hollow rod formed by the interlacing of the baffle and the slot fully and evenly injects the concrete grout after installation. The inner grouting rod, the middle placement cavity and the outer steel cage are poured and fixed in the foundation pit. The concrete grout overflowing during pouring overflows at the grout outlet. When installing, the auxiliary mounting seat is used to adapt it to the photovoltaic bracket so that the photovoltaic bracket can be flexibly assembled and installed on this device. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure after the photovoltaic anchor pile device is installed in the pile foundation pit; Figure 2 This is a structural schematic diagram of the process of installing the photovoltaic anchor pile device into the pile foundation pit; Figure 3 This is a schematic diagram of the assembled photovoltaic anchor pile device; Figure 4 This is a schematic diagram of the structure before the inner grouting rod is inserted into the middle placement cavity; Figure 5 This is a schematic diagram of the structure before the central placement cavity is inserted into the outer steel cage; Figure 6 This is a schematic diagram of the structure before the bottom of the central placement cavity is connected to the base of the outer steel cage; Figure 7 This is a schematic diagram of the structure after the bottom of the central placement cavity is connected to the base of the outer steel cage; Figure 8This is a schematic diagram of the structure in which the unfolded wings on both sides of the gripping rod detach from the mounting groove of the auxiliary ring unit; Figure 9 This is a schematic diagram of the structure when the guide ring and the assembly auxiliary ring are connected; Figure 10 This is a schematic diagram of the structure when the unfolded wings on both sides of the gripping rod are inside the mounting groove of the auxiliary ring unit; Figure 11 This is a structural diagram showing the connection between the clamping rod and the auxiliary ring unit; Figure 12 This is a schematic diagram showing the connection between the gripping rod and the deploying wing; Among them, 1 is the outer steel cage, 11 is the straight steel bar, 12 is the spiral steel bar, 13 is the base, and 14 is the slot; 2 is the central placement cavity, 21 is the top guide ring, 22 is the assembly auxiliary ring, 220 is the auxiliary ring unit, 221 is the mounting platform, 222 is the mounting groove, 23 is the guide ring, 231 is the retaining ring, 24 is the gripping rod, 241 is the top block, 242 is the grouting port, 243 is the stop block, 244 is the first rotating shaft, 245 is the unfolding wing, 246 is the spring piece, 2461 is the second rotating shaft, 2462 is the push-out spring, 2463 is the fixing sleeve, 2464 is the through shaft, 25 is the arc-shaped card, and 251 is the anti-slip buckle strip; 3 is the inner grouting rod, 31 is the top ring, 32 is the outer pile, 33 is the overflow port, 34 is the mounting base, 35 is the baffle, 36 is the groove, and 37 is the top cone. Detailed Implementation

[0023] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0024] like Figure 1As shown in Figure 12, this invention provides a photovoltaic anchor pile device for improving the stability of silty soil burial, including an outer steel cage 1, a central placement cavity 2 inside the outer steel cage 1, and an inner grouting rod 3 inside the central placement cavity 2. The central placement cavity 2 includes a top guide ring 21, and multiple sets of assembly auxiliary rings 22 are installed at the lower end of the top guide ring 21. The lowermost assembly auxiliary ring 22 is fixedly connected to the bottom end inside the outer steel cage 1. Multiple gripping rods 24 are slidably inserted inside each set of assembly auxiliary rings 22. A resilient unfolding wing 245 is rotatably provided at both ends of the gripping rod 24. A grouting channel is provided inside the gripping rod 24. A grouting channel is provided inside the inner grouting rod 3. A top cone 37 is provided at the lower end of the inner grouting rod 3. Grouting holes are provided on the side wall of the inner grouting rod 3. An installation seat 34 is fixedly provided at the upper end of the inner grouting rod 3.

[0025] The outer steel cage 1 includes straight steel bars 11, spiral steel bars 12, and a base 13. The base 13 is a horizontally arranged circular plate structure. A ring of vertical straight steel bars 11 is fixedly installed at the outer edge of the upper surface of the base 13. The six straight steel bars 11 inside the ring are arranged in a circular array around the axis of the base 13. Spiral steel bars 12 are fixedly installed outside the ring of straight steel bars 11. Two symmetrical, vertically connected arc-shaped slots 14 are provided on the base 13.

[0026] The straight reinforcing bar 11 is a high-strength threaded reinforcing bar made of high-strength alloy steel. The surface of the straight reinforcing bar 11 is coated with a composite anti-corrosion coating. The composite anti-corrosion coating adopts a three-layer structure of "zinc layer, epoxy resin layer and wear-resistant layer". The zinc layer provides cathodic protection, the epoxy resin layer isolates moisture and salt, and the wear-resistant layer prevents the coating from falling off during construction, which greatly improves the durability of the anchored reinforcing bar, adapts to the corrosive environment of silty soil, and extends its service life.

[0027] The central placement cavity 2 also includes a guide ring 23 and an arc-shaped card 25.

[0028] The top guide ring 21 is a cylindrical structure with openings at both the top and bottom. The lower end of the top guide ring 21 is fixedly connected to the uppermost set of assembly auxiliary rings 22, and any two adjacent sets of assembly auxiliary rings 22 are fixedly connected by a guide ring 23. Two symmetrical arc-shaped clips 25 are fixedly installed at the lower end of the lowermost assembly auxiliary ring 22, and the two arc-shaped clips 25 are respectively inserted into the two slots 14 on the base 13. The outer diameters of the top guide ring 21, assembly auxiliary rings 22, and guide ring 23 are equal.

[0029] Each set of auxiliary rings 22 comprises six auxiliary ring units 220 stacked vertically, with any two adjacent auxiliary ring units 220 fixedly connected. Each auxiliary ring unit 220 is a horizontally arranged circular structure, with a vertically penetrating C-shaped groove on each unit. A mounting platform 221 is located at the opening of the C-shaped groove on each auxiliary ring unit 220, and an internally and externally connected mounting groove 222 is provided on the mounting platform 221, arranged radially along the auxiliary ring unit 220. The mounting grooves 222 on the six auxiliary ring units 220 within a set are arranged in a circular array around the axis of the auxiliary ring unit 220, meaning that any two adjacent auxiliary ring units 220 have mounting grooves 222 spaced 60° apart. The outer openings of the mounting grooves 222 on the six auxiliary ring units 222 respectively face six straight reinforcing bars 11.

[0030] The guide ring 23 is a horizontally arranged circular structure. A C-shaped retaining ring 231 is fixedly provided at both the upper and lower ends of the guide ring 23. The retaining ring 231 at the upper end of the guide ring 23 engages with the C-shaped groove of the lowermost auxiliary ring unit 220 in the upper group of assembly auxiliary rings 22. The retaining ring 231 at the lower end of the guide ring 23 engages with the C-shaped groove of the uppermost auxiliary ring unit 220 in the lower group of assembly auxiliary rings 22.

[0031] A C-shaped retaining ring 231 is also fixedly provided on the lower end face of the top guide ring 21. The retaining ring 231 at the lower end of the top guide ring 21 is engaged with the C-shaped groove of the uppermost auxiliary ring unit 220 in the uppermost set of assembly auxiliary rings 22.

[0032] A raised strip structure is fixedly provided on both the inner and outer sides of all retaining rings 231, and a groove structure is provided on the inner wall of all C-shaped through grooves. When the retaining ring 231 is engaged in the corresponding C-shaped through groove, the raised strip structure and the groove structure engage, increasing the tightness of the connection between the retaining ring 231 and the C-shaped through groove, thereby ensuring a stable connection between the top guide ring 21, the assembly auxiliary ring 22, and the guide ring 23.

[0033] The assembly auxiliary ring 22 and the guide ring 23 are spaced apart. By increasing or decreasing the number of assembly auxiliary rings 22, the length of the middle placement cavity 2 can be adjusted to better meet the needs of the site.

[0034] Two symmetrical arc-shaped cards 25 are fixedly mounted on the lower end face of the lowest auxiliary ring unit 220 in the lowest set of assembly auxiliary rings 22. Each arc-shaped card 25 has a row of anti-slip strips 251 on its inner and outer sides from top to bottom. The anti-slip strips 251 have an inverted triangular structure and are made of rubber. When the two arc-shaped cards 25 are respectively inserted into the two slots 14 on the base 13, the anti-slip strips 251 on the inner and outer sides of the arc-shaped cards 25 engage with the lower opening of the slots 14, thereby preventing the arc-shaped cards 25 from accidentally coming out of the slots 14.

[0035] The clamping rod 24 is a V-shaped rod structure. The pointed end of the clamping rod 24 passes through the mounting groove 222 and extends into the interior of the auxiliary ring unit 220. Both ends of the clamping rod 24 pass through the mounting groove 222 and extend to the outside of the auxiliary ring unit 220. The V-shaped opening of the clamping rod 24 faces the corresponding straight steel bar 11.

[0036] A top block 241 with a four-sided pyramid structure is fixedly installed on the outer side of the pointed end in the middle of the gripping rod 24. A grout inlet is provided on each of the four outer surfaces of the top block 241. Grouting ports 242 are arranged on the inner side of the gripping rod 24 and at both ends of the gripping rod 24. The grout inlets and grouting ports 242 are connected to the grout passage inside the gripping rod 24. When concrete grout flows in from the grout inlet, it can flow out through the grout passage from multiple grouting ports 242.

[0037] A stop block 243 is fixedly installed on the outer sides of both ends of the gripping rod 24. Each stop block 243 has a deployable wing 245 rotatably mounted on it via a first pivot 244. The deployable wings 245 on both sides and the gripping rod 24 in the middle together form a "W" shape structure, with the end of the deployable wing 245 away from the gripping rod 24 having a pointed angle. A V-shaped spring piece 246 is provided between the gripping rod 24 and each deployable wing 245. The two ends of the spring piece 246 are respectively hinged to the inner side of the deployable wing 245 and the outer side of the gripping rod 24 via a second pivot 2461. A V-shaped push-out spring 2462 is provided in the middle of the inner side of the spring piece 246. Two symmetrical fixing sleeves 2463 are fixedly installed on the inner side of the spring piece 246, and the two ends of the push-out spring 2462 are respectively hinged to the two fixing sleeves 2463. A through shaft 2464 is rotatably provided in the middle of the spring 2462, and both ends of the through shaft 2464 are fixedly connected to the middle of the spring piece 246.

[0038] When the gripping rod 24 is inside the mounting slot 222, the rebound force of the push-out spring 2462 pushes the two ends of the spring piece 246 to gradually open. The two ends of the spring piece 246 push the corresponding unfolding wings 245 to rotate away from the gripping rod 24, so that the outer surface of the unfolding wings 245 abuts against the inner wall of the mounting slot 222. When the gripping rod 24 is disengaged from the mounting slot 222, the rebound force of the push-out spring 2462 causes the unfolding wings 245 to continue to rotate away from the gripping rod 24. The maximum rotation angle of the unfolding wings 245 is limited by the stop block 243.

[0039] The inner grouting rod 3 is composed of multiple sets of baffles 35 distributed along its axis. Each set contains three baffles 35 arranged in a circular array, and any two adjacent sets of baffles 35 are fixedly connected to each other. The baffles 35 have a square structure, and any two adjacent baffles 35 in each set form a square slot 36. The slot 36 is connected to the grouting channel inside the inner grouting rod 3, and the slot 36 constitutes the grouting hole.

[0040] A top ring 31 is fixedly installed at the upper end of the inner grouting rod 3, and an outer pile 32 is fixedly installed at the upper end of the top ring 31. An overflow port 33 is provided at the connection between the outer pile 32 and the top ring 31, and the overflow port 33 is connected to the grouting channel. A mounting base 34 is fixedly installed on the top of the outer pile 32, and the mounting base 34 is used to fix and install the photovoltaic bracket.

[0041] The top cone 37 is a hollow conical structure that is thicker at the top and thinner at the bottom. The upper end of the top cone 37 is fixedly connected to a set of baffles 35 on the lowest side of the inner grouting rod 3.

[0042] The working principle of this invention is as follows: Step 1, component processing After the depth of the pile foundation pit is set, the corresponding equipment components are pre-processed and manufactured. Two straight high-strength alloy steel bars 11 are welded to the outer edge of the upper surface of the base 13. Spiral steel bars 12 are wrapped around the outside of the six straight steel bars 11, and then the spiral steel bars 12 are welded to the six straight steel bars 11 as a whole. Subsequently, the outer steel cage 1 is sprayed with a composite anti-corrosion coating, and after the coating is formed, the outer steel cage 1 is protected with packaging (using low-cost and recyclable cardboard boxes, foam paper, etc.) to prevent the coating of the outer steel cage 1 from being damaged during transportation. At the same time, the inner grouting rods 3 of corresponding length are processed according to the depth of the pit. After each grabbing rod 24 and its outer unfolding wings 245 are processed and installed, the unfolding wings 245 on both sides of the grabbing rod 24 are folded and tied with cable ties, which reduces the footprint of the grabbing rod 24 and prevents damage to the unfolding wings 245 during transportation.

[0043] The second step is on-site installation. After the pile foundation is completed, the outer steel cage 1 is placed inside the pre-set pile foundation pit, and the middle placement cavity 2 is assembled according to the depth of the pile foundation pit. During assembly, first, snap the retaining ring 231 at the lower end of the top guide ring 21 into the C-shaped groove of the uppermost auxiliary ring unit 220 in the first set of assembly auxiliary rings 22. Then, snap the retaining ring 231 at the upper end of the guide ring 23 into the C-shaped groove of the lowermost auxiliary ring unit 220 in the first set of assembly auxiliary rings 22. Next, snap the retaining ring 231 at the lower end of the guide ring 23 into the C-shaped groove of the uppermost auxiliary ring unit 220 in the second set of assembly auxiliary rings 22. Connect the assembly auxiliary rings 22 and guide rings 23 in sequence according to the process until the middle placement cavity 2 reaches the corresponding length. At this time, snap the C-shaped groove of the uppermost auxiliary ring unit 220 of the assembly auxiliary ring 22, which has the arc-shaped card 25 installed at the lower end, into the retaining ring 231 at the lower end of the lowermost guide ring 23.

[0044] After the frame of the central placement cavity 2 is installed, remove the gripping rods 24 and insert the gripping rods 24, which are bound with cable ties, into the six mounting slots 222 of each set of assembly auxiliary rings 22. This ensures that the main body of the gripping rods 24 and the unfolding wings 245 on both sides are located inside the auxiliary ring unit 220, so as not to affect the later insertion of the central placement cavity 2 into the outer steel cage 1. After all the gripping rods 24 are installed, before placing the central placement cavity 2 into the outer steel cage 1, cut all the cable ties on each gripping rod 24. This can minimize the pre-damage to the gripping rods 24. At this time, under the rebound force of the push-out spring 2462, the unfolding wings 245 on both sides abut against the inner walls of the mounting slots 222.

[0045] At this point, the central placement cavity 2 is in a fully prepared state. Adjust the angle of the central placement cavity 2 so that the six gripping rods 24 on each set of assembly auxiliary rings 22 are respectively facing the six straight steel bars 11. Then, place the central placement cavity 2 vertically downward inside the outer steel cage 1. When the central placement cavity 2 is placed at the bottom of the outer steel cage 1, the two arc-shaped clips 25 on the bottom set of assembly auxiliary rings 22 are respectively inserted into the two slots 14 on the base 13. The anti-slip buckles 251 on the inner and outer sides of the arc-shaped clips 25 engage with the lower opening of the slots 14 to achieve obstruction, which can prevent relative displacement between the central placement cavity 2 and the outer steel cage 1 after installation.

[0046] After inserting the central placement cavity 2 into the outer steel cage 1, remove the corresponding inner grouting rod 3. Insert one end of the top cone 37 vertically downward into the central placement cavity 2. The conical top cone 37 contacts the four-sided pyramidal top block 241, generating an outward pushing force on the gripping rod 24, thus pushing all the gripping rods 24 outward from top to bottom into the corresponding mounting slots 222. During the process of pushing the gripping rods 24 outward from the mounting slots 222, both ends of the gripping rods 24 gradually extend to both sides of the corresponding straight reinforcing bars 11 until the inner middle of the gripping rods 24 abuts against the corresponding straight reinforcing bars 11, thereby limiting the maximum extension length of the gripping rods 24. As the gripping rod 24 is pushed outward from the mounting slot 222, the unfolding wings 245 on both sides of the gripping rod 24 gradually disengage from the mounting slot 222. At this time, under the rebound force of the push-out spring 2462, the unfolding wings 245 on both sides rotate away from the gripping rod 24 until both sides of the unfolding wings 245 contact the stop block 243 on the same side and reach the maximum unfolding angle. The stop block 243 prevents the unfolding wings 245 from over-rotating. During the unfolding process of the unfolding wings 245 on both sides, the sharp corner structure at the end of the unfolding wing 245 away from the gripping rod 24 inserts into the silt under the impact force of the ejection, realizing the gripping of the soil layer, increasing the area of ​​gripping silt, and improving the gripping strength.

[0047] The third step is casting and shaping. Take out the mixed concrete grout, connect the grouting pipe to the grouting channel inside the inner grouting rod 3, and start the grouting mechanism to inject concrete into the grouting channel inside the inner grouting rod 3. The concrete grout enters the middle placement cavity 2 through the slot 36, and then overflows outward through the installation slot 222 on the middle placement cavity 2 to the outer steel cage 1 and the inside of the pile foundation pit. At the same time, the concrete grout at the installation slot 222 enters the grout passage inside the gripping rod 24 through the grout inlet, and then outputs outward from the grouting port 242, thus reinforcing the gripping rod 24 as a whole. When the grout overflows from the overflow port 33, it indicates that the grouting inside the pile foundation pit is complete, and grouting can be stopped.

[0048] Step 4: Install photovoltaic support brackets During the aforementioned component processing and on-site installation phases, the model of the bottom end of the photovoltaic bracket is processed and installed. During the pouring process, according to the model of the photovoltaic bracket to be installed, a corresponding installation square rod is reserved in the inner cavity of the mounting base 34 to improve the installation stability of the photovoltaic bracket. The bottom end of the photovoltaic bracket is then fixed to the top ring 31 and the mounting base 34 to complete the fixed assembly, thus realizing the flexible assembly and installation of the photovoltaic bracket on this device.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A photovoltaic anchor pile device for improving the stability of silty soil burial, characterized in that: The system includes an outer steel cage (1), a central placement cavity (2) is provided inside the outer steel cage (1), and an inner grouting rod (3) is provided inside the central placement cavity (2). The central placement cavity (2) includes a top guide ring (21), and multiple sets of assembly auxiliary rings (22) are installed at the lower end of the top guide ring (21). The lowest assembly auxiliary ring (22) is fixedly connected to the bottom end of the outer steel cage (1). Multiple gripping rods (24) are slidably inserted inside each set of assembly auxiliary rings (22). A resilient unfolding wing (245) is rotatably provided at both ends of the gripping rod (24). A grouting channel is provided inside the gripping rod (24). A grouting channel is provided inside the inner grouting rod (3). A top cone (37) is provided at the lower end of the inner grouting rod (3). A grouting hole is provided on the side wall of the inner grouting rod (3). An installation seat (34) is fixedly provided at the upper end of the inner grouting rod (3).

2. The photovoltaic anchor pile device for improving the stability of silty soil burial as described in claim 1, characterized in that: The outer steel cage (1) includes straight steel bars (11), spiral steel bars (12), and a base (13). Six vertical straight steel bars (11) are fixedly installed at the outer edge of the upper end face of the base (13), and spiral steel bars (12) are fixedly installed on the outside of the six straight steel bars (11). Two slots (14) are provided on the base (13).

3. The photovoltaic anchor pile device for improving the stability of silty soil burial as described in claim 2, characterized in that: The middle placement cavity (2) also includes a guide ring (23) and an arc-shaped card (25); the lower end of the top guide ring (21) is fixedly connected to the uppermost set of assembly auxiliary rings (22), and any two adjacent sets of assembly auxiliary rings (22) are fixedly connected by a guide ring (23); the lower end of the lowermost assembly auxiliary ring (22) is fixedly provided with two arc-shaped cards (25), and the two arc-shaped cards (25) are respectively inserted into the two slots (14) on the base (13).

4. The photovoltaic anchor pile device for improving the stability of silty soil burial as described in claim 3, characterized in that: Each set of auxiliary rings (22) includes six auxiliary ring units (220) stacked one above the other. Each auxiliary ring unit (220) has a groove and an internal and external connected mounting groove (222). The outer openings of the mounting grooves (222) on the six auxiliary ring units (220) face the six straight steel bars (11).

5. A photovoltaic anchor pile device for improving the stability of silty soil burial according to claim 4, characterized in that: A retaining ring (231) is fixedly provided at both the upper and lower ends of the guide ring (23). The retaining ring (231) at the upper end of the guide ring (23) is engaged in the groove of the lowest auxiliary ring unit (220) in the upper group of assembly auxiliary rings (22). The retaining ring (231) at the lower end of the guide ring (23) is engaged in the groove of the highest auxiliary ring unit (220) in the lower group of assembly auxiliary rings (22). A retaining ring (231) is also fixedly provided on the lower end face of the top guide ring (21). The retaining ring (231) at the lower end of the top guide ring (21) is engaged in the groove of the highest auxiliary ring unit (220) in the uppermost group of assembly auxiliary rings (22).

6. A photovoltaic anchor pile device for improving the stability of silty soil burial according to claim 4, characterized in that: Two curved cards (25) are fixedly set at the lower end of the auxiliary ring unit (220) of the lowest set of assembly auxiliary rings (22). Each curved card (25) has a row of anti-slip buckles (251) on its inner and outer sides from top to bottom. When the two curved cards (25) are respectively inserted into the two slots (14) on the base (13), the anti-slip buckles (251) on the inner and outer sides of the curved card (25) are engaged with the lower opening of the slot (14).

7. A photovoltaic anchor pile device for improving the stability of silty soil burial according to claim 4, characterized in that: The gripping rod (24) is a V-shaped rod structure. The pointed end of the gripping rod (24) passes through the mounting groove (222) and extends into the auxiliary ring unit (220). The two ends of the gripping rod (24) pass through the mounting groove (222) and extend to the outside of the auxiliary ring unit (220). The V-shaped opening of the gripping rod (24) faces the corresponding straight steel bar (11). A top block (241) with a four-sided pyramid structure is fixedly installed on the outside of the pointed end of the gripping rod (24). A grout inlet is provided on the top block (241). Grouting ports (242) are arranged on the inner side of the gripping rod (24) and at both ends of the gripping rod (24). The grout inlet and the grouting port (242) are connected to the grout passage inside the gripping rod (24).

8. A photovoltaic anchor pile device for improving the stability of silty soil burial according to claim 7, characterized in that: A stop block (243) is fixedly installed on the outer side of each end of the gripping rod (24). Each stop block (243) has a deployable wing (245) rotatably mounted on it via a first pivot (244). A V-shaped spring piece (246) is provided between the gripping rod (24) and each deployable wing (245). The two ends of the spring piece (246) are respectively connected to the inner side of the deployable wing (245) and the outer side of the gripping rod (24) via a second pivot (2461). The spring (246) is hinged to the surface. A V-shaped push-out spring (2462) is provided in the middle of the inner side of the spring (246). Two symmetrical fixed sleeves (2463) are fixedly provided on the inner side of the spring (246). The two ends of the push-out spring (2462) are respectively hinged to the two fixed sleeves (2463). A through shaft (2464) is rotatably provided in the middle of the push-out spring (2462). Both ends of the through shaft (2464) are fixedly connected to the middle of the spring (246).

9. A photovoltaic anchor pile device for improving the stability of silty soil burial according to claim 1, characterized in that: The inner grouting rod (3) is composed of multiple sets of baffles (35), and any two adjacent sets of baffles (35) are fixedly connected to each other; each set includes multiple baffles (35) arranged in a circular array, and any two adjacent baffles (35) in each set form a slot (36), which is connected to the grouting channel inside the inner grouting rod (3), and the slot (36) constitutes the grouting hole.

10. A photovoltaic anchor pile device for improving the stability of silty soil burial according to claim 1, characterized in that: A top ring (31) is fixedly installed at the upper end of the inner grouting rod (3), and an outer pile (32) is fixedly installed at the upper end of the top ring (31). An overflow port (33) is provided at the connection between the outer pile (32) and the top ring (31), and the overflow port (33) is connected to the grouting channel. An installation seat (34) is fixedly installed on the top of the outer pile (32), and the installation seat (34) is used to fix and install the photovoltaic bracket.

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