Wear-resistant and corrosion-resistant screw pile

Abstract

The utility model belongs to the technical field of photovoltaic support installation equipment, and particularly relates to a wear-resistant and corrosion-resistant screw pile. Comprising a pile body, a cone is arranged at the insertion end of the pile body, and spiral blades are arranged on the pile body; a first coating is arranged on the surface of the pile body, and a second coating is arranged on the outer surface of the first coating. The first coating is a zinc coating, and the second coating is a polyvinylidene fluoride coating. The wear-resisting and corrosion-resisting performance of the screw pile can be improved, and the service life of the screw pile is prolonged. Meanwhile, the metal surface of the pile body can be protected, the conductivity is prevented from being reduced, the grounding performance is stable, and safe operation of a photovoltaic system is guaranteed. The maintenance cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of photovoltaic bracket installation equipment, specifically relating to a wear-resistant and corrosion-resistant spiral pile. Background Technology

[0002] With the continuous growth of energy demand and the increasing awareness of environmental protection, renewable energy has become a mainstream trend. Solar energy, as a clean and renewable energy source, has received widespread attention and application. Solar power generation requires the installation of photovoltaic (PV) brackets. PV brackets typically require helical piles for support; the helical piles are inserted into the ground, and their upper ends are connected to the PV bracket. For example, the prior art CN207891882U discloses a special helical grounding pile for PV brackets, which includes a pile body with two or more helical blades, a cone at the insertion end of the pile body, and at least one bolt hole at the outer end of the pile body opposite to the insertion end.

[0003] However, with the increasing demand for energy, solar energy needs to be installed and used in more complex geological conditions. For example, in acidic or alkaline soils where crops are not very valuable, soils with a high content of gravel, or in harder rocky geological conditions, solar energy can be installed without occupying additional land resources and can make full use of the space in acidic or alkaline soils.

[0004] Existing helical pile technology has significant shortcomings in acid- and alkaline corrosive soils and ground surfaces with high gravel content. In acid- and alkaline corrosive soils, corrosion is a primary concern; high concentrations of salt and corrosive substances in the soil severely erode the metal components of the helical pile, reducing its service life and load-bearing capacity. Secondly, the loose structure of acid- and alkaline corrosive soils, coupled with alternating wet and dry periods and salt crystallization, alters the soil's physical properties, leading to decreased stability of the helical pile. Furthermore, acid- and alkaline corrosive soils increase construction difficulty and cost.

[0005] In areas with high gravel content, drilling with helical piles is difficult, requiring greater drilling force and power, which can easily cause wear and damage to construction equipment. The pile body is also easily damaged during forced drilling, resulting in deformation and cracking, affecting its bearing capacity and service life. Even if drilling is successful, the limited soil friction and support force may prevent the bearing capacity from meeting design requirements, necessitating other measures to improve it. These shortcomings restrict the application of helical piles under specific geological conditions.

[0006] Therefore, there is an urgent need to provide a wear-resistant and corrosion-resistant helical pile. Utility Model Content

[0007] To address the technical problem of short service life of existing spiral piles in complex geological conditions, this utility model provides a wear-resistant and corrosion-resistant spiral pile.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows:

[0009] A wear-resistant and corrosion-resistant spiral pile includes a pile body, an insertion end of which is provided with a cone, and spiral blades are provided on the pile body; a first coating is provided on the surface of the pile body, and a second coating is provided on the outer surface of the first coating.

[0010] Furthermore, the first coating is a zinc plating layer, and the second coating is a polyvinylidene fluoride coating.

[0011] Furthermore, the zinc plating layer has a thickness of 65μm-85μm; the polyvinylidene fluoride coating has a thickness of 1.5mm-2.5mm; preferably 2mm.

[0012] Furthermore, the outer surface of the spiral blade is also provided with a zinc plating layer, and the outer surface of the zinc plating layer of the spiral blade is provided with a polyvinylidene fluoride coating.

[0013] Furthermore, a first groove is provided on the outer surface of the pile body, the first groove extending along the length direction of the pile body; and / or, a second groove is provided on the upper surface of the helical blade, the second groove extending radially along the helical blade; and / or, a third groove is provided on the lower surface of the helical blade, the third groove extending radially along the helical blade.

[0014] Furthermore, the first groove has a square cross-section, a width of 1 mm, and a depth of 1 mm; the first grooves are arranged in an array along the outer circumferential surface of the pile, and the interval between adjacent first grooves is 30°.

[0015] Furthermore, the second groove has a square cross-section, a width of 1 mm, and a depth of 1 mm; the interval between adjacent second grooves is 30°.

[0016] Furthermore, the cross-section of the third groove is square, the width of the third groove is 1mm, and the depth is 1mm; the interval between adjacent third grooves is 30°.

[0017] Furthermore, the cone angle of the cone is less than 40°, preferably 32°.

[0018] Furthermore, the outer diameter of the pile is 90 mm and the wall thickness is 4 mm.

[0019] Furthermore, the number of helical blades is three, and the three helical blades are equidistantly distributed, with a spacing of 600mm between two adjacent helical blades.

[0020] Furthermore, the thickness of the helical blade is 5 mm, and the outer diameter of the helical blade decreases from the outer end to the insertion end.

[0021] Furthermore, the outer end of the pile body opposite to the insertion end is provided with a bolt hole.

[0022] Furthermore, the number of bolt holes is three, and the three bolt holes are evenly distributed along the cross-section of the pile body; two bolt holes are located on the same cross-section, and the other bolt hole is located on a different cross-section.

[0023] Furthermore, each of the bolt holes has a steel plate at its end.

[0024] Furthermore, a channel steel is also provided at the outer end of the pile body.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This utility model provides a wear-resistant and corrosion-resistant helical pile with two coatings on the outer surface of the pile body and the helical blades. The outer surface of the conical outer surface can also have the same two coatings as the pile body. The outermost layer is a polyvinylidene fluoride (PVDF) coating, and the next outermost layer is a galvanized layer. The corrosion-resistant coating forms a protective film, blocking corrosive media and slowing down the corrosion rate, thereby increasing the wear and corrosion resistance of the helical pile and extending its service life. It also protects the metal surface of the pile body, preventing a decrease in conductivity, ensuring stable grounding performance, and guaranteeing the safe operation of the photovoltaic system. It can adapt to various corrosive factors in different geographical environments, providing universal protection for helical piles. Furthermore, it reduces costs, minimizes maintenance and repair work, saves manpower, material resources, and financial resources, reduces downtime, and improves the economic efficiency of the power station. It also improves the safety performance of the helical pile, protects the structural integrity of the pile body, improves load-bearing and impact resistance, reduces safety risks, stabilizes grounding performance, and prevents electrical accidents. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the wear-resistant and corrosion-resistant spiral pile provided by this utility model. The structure of the first groove is shown to illustrate its position.

[0028] Figure 2 This is a schematic diagram of the spiral blade structure of the wear-resistant and corrosion-resistant spiral pile provided by this utility model. The first coating and the second coating are hidden to show the position of the second groove.

[0029] Figure 3 This is a schematic diagram of the outer end structure of the wear-resistant and corrosion-resistant spiral pile of this utility model. The first coating and the second coating are hidden to show the position of the first groove.

[0030] Figure 4 This is a schematic diagram of the cross-sectional structure of the pile.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Pile body, 2. Cone, 3. Helical blade, 4. First coating, 5. Second coating, 6. First groove, 7. Second groove, 8. Bolt hole, 9. Channel steel. Detailed Implementation

[0033] The technical solution of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical expressions of the components and steps described in these embodiments should not be construed as limiting the scope of this utility model.

[0035] The following description of exemplary embodiments is merely illustrative and is not intended to limit the present invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0036] This utility model provides a wear-resistant and corrosion-resistant helical pile, such as Figure 1 As shown, the pile includes a pile body 1, with a cone 2 at the insertion end and a helical blade 3 on the pile body 1. A first coating 4 is applied to the surface of the pile body 1, and a second coating 5 is applied to the outer surface of the first coating 4. The combination of the two coatings forms a stronger protective system, enhancing the wear and corrosion resistance of the helical pile, extending its service life, and improving its utilization rate in acidic and alkaline soils.

[0037] The first coating 4 is a galvanized layer, and the second coating 5 is a polyvinylidene fluoride (PVDF) coating. The galvanized layer has excellent corrosion resistance, effectively protecting the pile from various corrosive substances in the soil and extending its service life. Outside the galvanized layer, the outermost coating uses PVDF, a material with excellent weather resistance, corrosion resistance, and wear resistance. In terms of protection, in high-humidity environments, the low water absorption of PVDF, combined with the galvanized layer, effectively blocks moisture penetration and prevents internal structure erosion. In highly corrosive soils, the resistance of PVDF to acids, alkalis, and salts works synergistically with the galvanized layer to create a robust protective barrier for the helical pile. The combined composite coating exhibits strong protection in harsh environments, significantly reducing the risk of corrosion to the helical pile. It also reduces the frequency of maintenance and replacement, effectively lowering overall costs. Frequent maintenance and replacement not only consume manpower, material resources, and financial resources but also affect project progress. This composite coating ensures the stability and safety of the helical pile under harsh conditions.

[0038] The zinc plating layer has a thickness of 65μm-85μm, preferably 85μm, and the coating thickness should be as uniform as possible. Figure 4 As shown, the thickness of the polyvinylidene fluoride coating is 1.5mm-2.5mm; preferably 2mm. The polyvinylidene fluoride coating is formed by high-temperature baking and cooling crystallization, and has very good corrosion resistance and a certain degree of wear resistance.

[0039] In addition to the pile body 1, the outer surface of the helical blade 3 is also provided with a galvanized layer, and the outer surface of the galvanized layer of the helical blade 3 is coated with polyvinylidene fluoride. Alternatively, the outer surface of the cone 2, which is integrally connected to the pile body 1, can also be provided with a galvanized layer, and the outer surface of the galvanized layer of the cone 2 can be coated with polyvinylidene fluoride. The coating thicknesses of the outer surfaces of the pile body 1, the helical blade 3, and the cone 2 can be set to be the same.

[0040] The outer surface of the pile body 1 is provided with a first groove 6, which extends along the length direction of the pile body 1; and / or, the upper surface of the helical blade 3 is provided with a second groove 7, which extends radially along the helical blade 3; and / or, the lower surface of the helical blade 3 is provided with a third groove, which extends radially along the helical blade 3. In this embodiment, the outer surface of the pile body 1 is provided with a first groove 6, the upper surface of the helical blade 3 is provided with a second groove 7, and the lower surface of the helical blade 3 is provided with a third groove.

[0041] The first groove 6 has a square cross-section, a width of 1 mm, and a depth of 1 mm. The first grooves 6 are arranged in an array along the outer periphery of the pile body 1, with an interval of 30° between adjacent first grooves 6. The second groove 7 has a square cross-section, a width of 1 mm, and a depth of 1 mm; the interval between adjacent second grooves 7 is 30°. The third groove (not shown in the figure) has a square cross-section, a width of 1 mm, and a depth of 1 mm; the interval between adjacent third grooves is 30°. Figure 2 As shown, the second groove 7 and the third groove are provided correspondingly, both extending from the innermost side of the spiral blade 3 to the outermost side.

[0042] The outer surface of the helical pile is secured with a square shallow groove for coating fixation. From an adhesion perspective, the shallow groove provides embedding sites for the polyvinylidene fluoride (PVDF) and galvanized layers, increasing the contact area and friction, ensuring a tight bond between the coating and the pile body, and preventing easy coating detachment. Regarding friction management, the friction generated during construction is dispersed to the groove walls and bottom. Unlike smooth surfaces where concentrated stress easily leads to coating damage, the shallow groove design reduces the risk of coating scraping and peeling due to friction, ensuring coating integrity during construction. This plays a crucial role in the subsequent protection of the helical pile and facilitates its long-term stable use.

[0043] A cone 2 is provided at the insertion end of the pile body 1 to reduce the resistance when the helical pile is driven into the ground, making construction more convenient and efficient. The cone angle of the cone 2 is less than 40°, preferably 32°. The cone angle can be adjusted according to the length and diameter of the pile body 1.

[0044] In this embodiment, the pile body 1 has an outer diameter of 90mm and a wall thickness of 4mm. Pile body 1 is made of Q345B steel and has a total length of 2300mm. The use of Q345B steel in the pile body 1 ensures its mechanical properties and guarantees the stability of the helical pile under complex geological conditions and high loads. Whether bearing heavy pressure in hard soil layers or dealing with impacts from obstacles encountered during construction, it maintains structural integrity. Simultaneously, its good toughness effectively resists dynamic load impacts and torsional forces during construction, reducing the risk of brittle fracture during piling and preventing breakage during earthquakes as the foundation deforms. In terms of corrosion resistance, it can resist corrosive media in complex underground environments, significantly extending the service life of the helical pile, reducing maintenance frequency and costs, and ensuring long-term foundation stability. This steel material optimizes the helical pile manufacturing process. Cutting operations are more precise, welding strength is enhanced, and cracks are less likely to occur during cold bending, effectively improving product quality and production efficiency.

[0045] Preferably, in this embodiment, there are three helical blades 3, which are equidistantly distributed, with a spacing of 600 mm between adjacent helical blades 3. Furthermore, the three helical blades 3 rotate in the same direction. Figure 2 As shown, the outer diameter of the spiral blade 3 decreases from the insertion end to the outer end, the maximum outer diameter of the spiral blade 3 is 304 mm, and the thickness of the spiral blade 3 is 5 mm.

[0046] like Figure 3 As shown, the outer end of the pile body 1 opposite to the insertion end is provided with bolt holes 8. There are three bolt holes 8, evenly distributed along the cross-section of the pile body 1; two bolt holes 8 are located on the same cross-section, and the third bolt hole 8 is located on a different cross-section. The bolt holes 8 are used for connection with the photovoltaic support, thereby ensuring the stability of the connection between the helical pile and the photovoltaic support, and also reasonably distributing the stress. A steel plate is provided at one end of each bolt hole 8, further enhancing the strength and reliability of the bolt connection.

[0047] The outer end of the pile body 1 is also provided with a channel steel 9. The channel steel 9 is welded to the pile body 1 and is used to connect the grounding wire to ensure the grounding safety of the photovoltaic support. The outermost end of the pile body 1 also has an end head, the diameter of which is larger than the diameter of the pile body.

[0048] This utility model provides wear-resistant and corrosion-resistant helical piles that can be applied to soils with a pH between 4.5 and 9. Before construction, it is necessary to explore the geological conditions and select a fixed point with minimal ground disturbance. The helical piles are then installed on the pile driver, and a high-precision level is used to precisely control the height of the helical piles entering the ground and the verticality of the piles. The insertion depth of the helical piles is controlled at approximately 2000 mm. After all the helical piles have passed inspection, photovoltaic panels are installed on top of them.

[0049] The above specific embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A wear-resistant and corrosion-resistant screw pile, comprising a pile body, a conical body is arranged at an insertion end of the pile body, and a spiral blade is arranged on the pile body; characterized in that, The pile body is provided with a first coating layer, and an outer surface of the first coating layer is provided with a second coating layer. An outer surface of the pile body is provided with a first groove extending along a length direction of the pile body; and / or, an upper surface of the spiral blade is provided with a second groove extending along a radial direction of the spiral blade; and / or, a lower surface of the spiral blade is provided with a third groove extending along a radial direction of the spiral blade.

2. The abrasion and corrosion resistant screw pile of claim 1, wherein, The first coating layer is a galvanized layer, and the second coating layer is a polyvinylidene fluoride coating layer.

3. The abrasion and corrosion resistant screw pile of claim 2, wherein, The thickness of the galvanized layer is 65 µm-85 µm; and the thickness of the polyvinylidene fluoride coating layer is 1.5 mm-2.5 mm.

4. The abrasion and corrosion resistant screw pile according to claim 2 or 3, characterized in that, An outer surface of the spiral blade is also provided with a galvanized layer, and an outer surface of the galvanized layer of the spiral blade is provided with a polyvinylidene fluoride coating layer.

5. The abrasion and corrosion resistant screw pile of claim 1, wherein, A cross section of the first groove is square, the width of the first groove is 1 mm, and the depth is 1 mm; the first grooves are arrayed along an outer circumferential surface of the pile body, and adjacent first grooves are spaced apart by 30°; A cross section of the second groove is square, the width of the second groove is 1 mm, and the depth is 1 mm; adjacent second grooves are spaced apart by 30°; A cross section of the third groove is square, the width of the third groove is 1 mm, and the depth is 1 mm; adjacent third grooves are spaced apart by 30°.

6. The abrasion and corrosion resistant screw pile of claim 1, wherein, The number of the spiral blades is 3, and an outer diameter of the spiral blades decreases from an insertion end to an outer end.

7. The abrasion and corrosion resistant screw pile of claim 1, wherein, The pile body is provided with bolt holes at an outer end opposite to the insertion end.

8. The abrasion and corrosion resistant screw pile of claim 7, wherein, The number of the bolt holes is 3, and the three bolt holes are uniformly distributed along a transverse cross section of the pile body; two of the bolt holes are arranged on the same transverse cross section, and the other bolt hole is arranged on a different transverse cross section. A steel plate is arranged at a hole end of each of the bolt holes.

9. The abrasion and corrosion resistant screw pile of claim 7, wherein, The outer end of the pile body is also provided with a channel steel.

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