Self-drilling type hollow anchor rod pile photovoltaic support foundation for mountainous region
By adopting self-drilling hollow anchor pile photovoltaic support foundation in the foundation construction of mountainous areas of photovoltaic power stations, and using electric drilling machinery and cement grouting technology, the problems of drilling difficulties and large concrete usage are solved, achieving more efficient and safer construction results.
Patent Information
- Application Number
- CN202420642657.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-03-29
AI Technical Summary
The foundation construction of existing photovoltaic power stations in mountainous areas has problems such as drilling difficulties, large concrete usage, and difficulty in vibration, resulting in high construction difficulty, high cost and low efficiency.
The self-drilling hollow anchor pile photovoltaic support foundation is used to drill and grout through electric drilling machinery. The pressure of cement slurry is used to penetrate into the rock and soil, forming better bonding force, and reducing the transport and vibration of concrete.
A safer and more efficient construction process in foundation construction in mountainous areas has been achieved, reducing construction difficulty and cost, and improving project quality and efficiency.
Smart Images
Figure CN222594812U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of photovoltaic brackets, and in particular relates to a self-drilling hollow anchor pile photovoltaic bracket foundation for mountainous areas. Background Art
[0002] As the number of photovoltaic power stations increases year by year, land resources with sufficient sunshine, flat terrain and good construction conditions are decreasing, such as the Gobi Desert, deserts, grasslands and other areas. It has become a trend to build photovoltaic power stations in areas with poor construction conditions such as agriculture, animal husbandry, lakes, and mountains, and "mountain photovoltaic power stations" have gradually become one of the models of photovoltaic power stations.
[0003] Mountain photovoltaic power stations refer to photovoltaic power stations built under complex terrain conditions such as mountains and hills. The construction sites are mostly sandy, desert and rocky mountains. The surface is undulating, with different orientations, and some are accompanied by small gullies, steep slopes and other micro-topography. The installation area is different in size, relatively scattered, and the design and construction are difficult and costly. However, it has the advantages of low land cost, convenient management, and little disturbance to life. Mountain photovoltaics have good geological conditions, with exposed rock layers in some areas, good foundation bearing capacity, and high compression modulus; in soil areas, the mechanical properties of the soil are also good.
[0004] The concrete work of a single support foundation in a photovoltaic project is very small, but the number of supports and foundations in a photovoltaic power station system is huge. For example, in a 100MW photovoltaic project, a fixed support type is adopted, with a double-column support, about 10,000 sets of supports, and about 100,000 foundations. It can be concluded that the number of foundation holes drilled in a photovoltaic project is large, the amount of foundation embedded parts and concrete is large, and the foundation cost accounts for about 5% of the cost of the entire photovoltaic power station.
[0005] At present, the mainstream type of micro-porous cast-in-place piles in steep rocky areas is adopted: the first type is to use a borehole diameter ≥ 150mm, a depth greater than 1.2m, pre-buried steel pipes + steel connectors, and pouring and vibrating low-grade concrete; the second type is to use a borehole diameter of about 100mm, a depth less than 1.0m, pre-buried steel pipes, and pouring high-strength grouting materials. In steep rocky areas, it is difficult to form holes, embed parts, transport and vibrate concrete. Material transportation often requires people to carry camels, horses or cableways, which is difficult, costly and inefficient. The drilling machinery is heavy and requires a large air compressor as power, making construction difficult. The above two foundation types have an impact on the quality and construction period of the project, especially the first type, which does not fully utilize the characteristics of high strength and good bearing capacity of the rock layer, and requires a larger hole diameter and depth.
[0006] In summary, due to the shortcomings of the commonly used support foundation forms in steep rocky areas and the large number of support foundations in photovoltaic systems, in order to improve project quality and construction efficiency, it is necessary to optimize and improve the commonly used foundation forms. Utility Model Content
[0007] The technical problem to be solved by the utility model is to provide a self-drilling hollow anchor pile photovoltaic bracket foundation for mountainous areas, to make up for the shortcomings of existing foundation forms in steep terrain areas, such as difficulty in drilling, large amount of concrete, and difficulty in vibration, so as to achieve technical effects such as safer, more efficient, and flexible construction.
[0008] According to the technical solution of the utility model, the utility model provides a self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas, including a first hollow anchor located below the ground, a drill bit is provided at one end of the first hollow anchor away from the ground, and the other end of the first hollow anchor is extended toward the ground and connected with at least one second hollow anchor, and both ends of the second hollow anchor are connected with a connecting threaded sleeve; a photovoltaic support foundation column is connected above the top connecting threaded sleeve; the lower end of the photovoltaic support foundation column is located below the ground, and the upper end of the photovoltaic support foundation column is located above the ground; a concrete pouring part is provided on the outer side of the upper end of the top second hollow anchor, the outer side of the top connecting threaded sleeve and the outer side of the lower part of the photovoltaic support foundation column, and the upper end of the concrete pouring part is located above the ground; cement slurry grouting parts are provided inside and outside the first hollow anchor and the second hollow anchor below the concrete pouring part.
[0009] Furthermore, the first hollow anchor has external threads at least at the upper end, the second hollow anchor has external threads at least at both ends, and the connecting threaded sleeve has internal threads matching the external threads of the first hollow anchor and the second hollow anchor.
[0010] Furthermore, the outer side surface of the concrete pouring part is columnar as a whole, and the outer side surface of the part of the concrete pouring part located below the ground is in contact with the foundation.
[0011] Furthermore, the outer sides of the first hollow anchor rod, the second hollow anchor rod and the connecting threaded sleeve located below the concrete pouring part all have cement slurry grouting parts; the outer side surface of the cement slurry grouting part is columnar as a whole, and the outer side surface of the cement slurry grouting part fits with the foundation.
[0012] Furthermore, a pad is connected to the lower end of the photovoltaic support foundation column, and the pad is connected to the uppermost connecting threaded sleeve.
[0013] Furthermore, the number of the second hollow anchor rod is one, and the number of the connecting threaded sleeves is two.
[0014] Furthermore, the drill bit is a cross all-steel drill bit.
[0015] Furthermore, the height of the concrete pouring part below the ground is 300 mm±100 mm.
[0016] Furthermore, the distance between the upper end of the topmost connecting threaded sleeve and the lower end of the drill bit is greater than or equal to 2000mm; the height of the concrete pouring part is greater than or equal to 500mm; the height of the part of the concrete pouring part located above the ground is greater than or equal to 200mm; the height of the part of the photovoltaic bracket foundation column located below the ground is greater than or equal to 200mm; the width of the concrete pouring part is greater than or equal to 400mm; and the diameter of the drill bit is greater than or equal to 50mm.
[0017] Compared with the prior art, the beneficial technical effects of the utility model are as follows:
[0018] The utility model of the self-drilling hollow anchor pile photovoltaic support foundation used in mountainous areas does not require separate drilling. The self-drilling anchor is both a part of the foundation body and a drill bit and a drill rod. The electric drill used is small and light, easy to carry, less restricted by terrain conditions, can be operated by one person, safe and efficient; the drill rod and the surrounding rock and soil adopt the grouting process, and the cement slurry can be injected into any position in the field from the bottom of the mountain through a pipeline through pressure, which reduces the handling and eliminates the difficulty of transporting the cement slurry. There is a certain pressure during grouting, and the cement slurry will penetrate around the rock and soil, with a larger contact area and better bonding force. This foundation form does not use heavy machinery, and the on-site construction is flexible and convenient. Grouting is done at the same time as drilling, which simplifies the construction steps and improves the efficiency and quality of the project. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a structural schematic diagram according to an embodiment of the utility model.
[0020] Figure 2 yes Figure 1 A partial enlarged view of the lower end of the photovoltaic support foundation column.
[0021] Figure 3 It is a schematic diagram of various structural dimensions according to an embodiment of the utility model.
[0022] Description of reference numerals in the accompanying drawings:
[0023] 1. The first hollow anchor rod; 2. The second hollow anchor rod; 3. The drill bit; 4. The connecting threaded sleeve; 5. The photovoltaic bracket foundation column; 6. The concrete pouring part; 7. The cement slurry grouting part; 8. The pad. DETAILED DESCRIPTION
[0024] The utility model provides a self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas, which makes up for the shortcomings of existing foundation forms in steep terrain areas, such as difficulty in drilling, large amount of concrete consumption, and difficulty in vibration, and achieves technical effects such as safer, more efficient, and flexible construction.
[0025] See also Figure 1, a self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas according to one embodiment of the utility model includes a first hollow anchor rod 1 located below the ground, and the first hollow anchor rod 1 is, for example, vertically arranged. A drill bit 3 is provided at one end of the first hollow anchor rod 1 away from the ground, and at least one second hollow anchor rod 2 is connected to the other end of the first hollow anchor rod 1 extending toward the ground (for example, upward), and both ends of the second hollow anchor rod 2 are connected to a connecting threaded sleeve 4; in other words, two or more hollow anchor rods are connected to each other through connecting threaded sleeves to form an integral anchor rod of a required length, and the axes of the first hollow anchor rod 1 and the second hollow anchor rod 2 coincide.
[0026] The top of the top connection threaded sleeve 4 is connected with a photovoltaic support foundation column 5, the lower end of the photovoltaic support foundation column 5 is located below the ground, and the upper end of the photovoltaic support foundation column 5 is located above the ground. The photovoltaic support foundation column 5 is connected to the hollow anchor rod to support the photovoltaic support system, and the upper end of the photovoltaic support foundation column 5 has a connection structure such as a connection hole for connecting other components of the photovoltaic system.
[0027] A concrete pouring part 6 is provided on the outer side of the upper end of the second hollow anchor rod 2, the outer side of the uppermost connecting threaded sleeve 4, and the outer side of the lower part of the photovoltaic support foundation column 5, and the upper end of the concrete pouring part 6 is located above the ground. A cement grouting part 7 is provided inside and outside the first hollow anchor rod 1 and the second hollow anchor rod 2 below the concrete pouring part 6.
[0028] More specifically, Figure 1 , Figure 3 In the illustrated embodiment, there is one second hollow anchor rod 2 and two connecting threaded sleeves 4. It is understandable that the present invention is not limited thereto, and a plurality of second hollow anchor rods 2 can be connected in this manner as required.
[0029] The first hollow anchor rod 1 has an external thread at least at the upper end, the second hollow anchor rod 2 has an external thread at least at both ends, and the connecting threaded sleeve 4 has an internal thread matching the external threads of the first hollow anchor rod 1 and the second hollow anchor rod 2; and the external thread can also be connected to match the electric drill. The first hollow anchor rod 1 is preferably made of 40Cr. General hollow anchor rods are also called hollow anchor rods or hollow steel bars, etc., and the entire length of the outer side has external threads. The connecting threaded sleeve 4 is a through-tube shape, so that after the first hollow anchor rod 1 is connected to the second hollow anchor rod 2, the two are connected internally. The connecting threaded sleeve 4 can connect the two hollow anchor rods, and can also be used as a connection with the photovoltaic bracket foundation column 5.
[0030] The drill bit 3 is preferably a cross all-steel drill bit, for example. A through hole is provided on the drill bit 3, so that the lower end of the first hollow anchor rod 1 is connected to the outside world. When grouting is performed from the upper end of the first hollow anchor rod 1 (or the second hollow anchor rod 2), the slurry (cement slurry) can fill the inside of the anchor rod and pass through the drill bit 3 (through hole) to fill between the anchor rod and the foundation, forming a cement slurry grouting part 7. The foundation described in the present utility model refers to the soil or rock mass under the ground as a supporting foundation.
[0031] The first hollow anchor rod 1, the second hollow anchor rod 2 and the connecting threaded sleeve 4 located below the concrete pouring part 6 are provided with a cement grouting part 7 on their outer sides. The outer side of the cement grouting part 7 is columnar as a whole, and the outer side of the cement grouting part 7 fits the foundation. In other words, a borehole is formed in the foundation during the construction process, and the first hollow anchor rod 1, the second hollow anchor rod 2 and the connecting threaded sleeve 4 are located in the borehole and have cement grout between them and the inner wall of the borehole. Preferably, for example, the cement grout is M30 cement grout, which is prepared on site and poured into the hollow anchor rod and the foundation by pressure.
[0032] The outer side surface of the concrete casting part 6 is generally columnar (for example, the bottom surface is a circular or rectangular column), and the outer side surface of the part of the concrete casting part 6 located below the ground is in contact with the foundation. In other words, the ground has a drilled hole at the concrete casting part 6, in which concrete is poured to form the concrete casting part 6. Preferably, for example, the concrete is C30 concrete, which is mixed on site and used for hollow anchor rods and photovoltaic support column protective caps, and at the same time as a horizontal providing member; in other words, the half of the concrete casting part 6 located above the ground forms a protective cap that provides protection, and the half of the concrete casting part 6 located below the ground forms a structure that provides lateral horizontal force.
[0033] Figure 2 In the illustrated embodiment, a pad 8 is connected to the lower end of the photovoltaic support base column 5, and the pad 8 is connected to the uppermost connecting threaded sleeve 4; the connection at both ends of the pad 8 is, for example, welding fixation; this method is convenient for connection and fixation and the fixing effect is stable.
[0034] See also Figure 3In a preferred embodiment, the height of the concrete casting part 6 below the ground (the difference between L1 and L3) is 300mm±100mm; the distance L1 between the upper end of the uppermost connecting threaded sleeve 4 and the lower end of the drill bit 3 is greater than or equal to 2000mm; the height L4 of the concrete casting part 6 is greater than or equal to 500mm; the height L3 of the concrete casting part 6 above the ground is greater than or equal to 200mm; the height L2 of the photovoltaic support foundation column 5 below the ground is greater than or equal to 200mm; the width of the concrete casting part 6 is greater than or equal to 400mm (for example, the concrete casting part 6 is a cylinder, and its radius R1 is greater than or equal to 200mm); the diameter D (or drill hole diameter) of the drill bit 3 is greater than or equal to 50mm. The distance between the upper end of the photovoltaic support foundation column 5 and the upper end of the concrete casting part 6 is, for example, about 200mm, to ensure that the function of the connection structure on the photovoltaic support foundation column 5 is not affected.
[0035] The main design ideas of the utility model are as follows. Taking full advantage of the good geological conditions and high bearing capacity of steep mountainous areas, combined with the characteristics of electric drills that can be operated by one person and flexible and convenient construction, the pressure grouting process is adopted to eliminate the difficulty of concrete transportation. At the same time, the pressure can make the cement slurry penetrate and diffuse into the surrounding rock and soil, and the bonding force is better. After the embedded parts, steel bars and foundation at the bottom of the foundation have sufficient pull-out bearing capacity, a circular or rectangular concrete cap is used to provide lateral horizontal force and protect the embedded parts and steel bars.
[0036] In order to further demonstrate the beneficial technical effects of the present invention, a specific construction process of an embodiment is given below.
[0037] During the implementation process, the following principles should be followed: clearing weeds, trees, pumice and other objects from the foundation; drilling, grouting, connecting hollow anchor rods, grouting; pouring concrete protective caps. The construction sequence and method are as follows:
[0038] 1. First determine the location of the foundation centerline and position it according to the PV module layout diagram and the on-site terrain and geological conditions.
[0039] 2. Clean the soil and rock at the foundation until the bottom elevation of the protective cap is reached. The depth from the natural ground is the difference between L4 and L3, for example, 300mm. It also needs to be calculated and determined based on the stress conditions of the support columns and the geological conditions.
[0040] 3. The first hollow anchor rod 1 is connected to the drill bit of the electric drill and to the rotary grouting adapter on the drilling rig. After the slurry is connected, drilling begins until the end of the first hollow anchor rod 1 reaches the bottom elevation of the protective cap.
[0041] 4. Stop injecting cement slurry, install the connecting threaded sleeve 4 on the top of the first hollow anchor rod 1, and install the second hollow anchor rod 2. The lengths of the two anchor rods are calculated and determined based on the stress conditions of the column and the geological conditions.
[0042] 5. Continue grouting and drilling until the end of the second hollow anchor rod 2 reaches the bottom elevation of the protective cap.
[0043] 6. Repeat steps 3, 4, and 5 according to different projects.
[0044] 7. Install the photovoltaic support foundation column 5 with the pad 8 and the connecting threaded sleeve 4.
[0045] 8. When the slurry reaches the design requirements, pour the C30 concrete protective cap and cure it to the design requirements.
[0046] 9. Test the foundation's compressive, tensile and horizontal bearing capacity. If it meets the design requirements, proceed to the next step. If not, correct the anchor diameter and anchor length, and repeat steps 3, 4, 5, 6, 7, and 8 until the design bearing capacity requirements are met.
[0047] As a supplementary explanation, ordinary hollow grouting anchor rods are tension rods that transfer the load of the anchored structure or rock and soil to the stable stratum. Pressure grouting of the anchor rod is carried out through the hollow rod body to achieve the purpose of consolidating broken rock and soil, isolating groundwater and protecting the rod body from corrosion. It is currently mainly used in tunnels, mining, slope stabilization and support of underground projects. The hollow anchor rod is mainly composed of high-strength and toughness seamless pipes.
[0048] In summary, the beneficial effects of the utility model are as follows. This scheme is a self-drilling hollow anchor photovoltaic bracket foundation, which does not require separate drilling. The self-drilling anchor is both a part of the foundation body and a drill bit and drill rod. The electric drill used is small and light, easy to carry, and less restricted by terrain conditions. It can be operated by one person, which is safe and efficient. The drill rod and the surrounding rock and soil adopt the grouting process. The cement slurry can be injected into any position in the site from the bottom of the mountain through a pipeline through pressure, which reduces transportation and eliminates the difficulty of transporting cement slurry. There is a certain pressure during grouting, and the cement slurry will penetrate around the rock and soil, with a larger contact area and better adhesion. This form of foundation does not use heavy machinery, and on-site construction is flexible and convenient. Grouting is performed simultaneously while drilling, which simplifies the construction steps and improves engineering efficiency and quality.
Claims
1. A self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas, characterized in that: The invention comprises a first hollow anchor rod (1) located below the ground, wherein a drill bit (3) is provided at one end of the first hollow anchor rod (1) away from the ground, and the other end of the first hollow anchor rod (1) is connected to at least one second hollow anchor rod (2) extending toward the ground, and both ends of the second hollow anchor rod (2) are connected to connecting threaded sleeves (4); a photovoltaic support foundation column (5) is connected above the top connecting threaded sleeve (4); the lower end of the photovoltaic support foundation column (5) is located below the ground, and the upper end of the photovoltaic support foundation column (5) is located above the ground; a concrete pouring part (6) is provided on the outer side of the upper end of the top second hollow anchor rod (2), the outer side of the top connecting threaded sleeve (4) and the outer side of the lower part of the photovoltaic support foundation column (5), and the upper end of the concrete pouring part (6) is located above the ground; and cement grouting parts (7) are provided inside and outside the first hollow anchor rod (1) and the second hollow anchor rod (2) below the concrete pouring part (6).
2. The self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas according to claim 1 is characterized in that: The first hollow anchor rod (1) has an external thread at least at the upper end, the second hollow anchor rod (2) has an external thread at least at both ends, and the connecting threaded sleeve (4) has an internal thread matching the external threads of the first hollow anchor rod (1) and the second hollow anchor rod (2).
3. The self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas according to claim 1 is characterized in that: The outer side surface of the concrete pouring part (6) is columnar as a whole, and the outer side surface of the part of the concrete pouring part (6) located below the ground is in contact with the foundation.
4. The self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas according to claim 1, characterized in that: The first hollow anchor rod (1), the second hollow anchor rod (2) and the connecting threaded sleeve (4) located below the concrete pouring part (6) are all provided with cement slurry grouting parts (7) on their outer sides; the outer side surface of the cement slurry grouting part (7) is columnar as a whole, and the outer side surface of the cement slurry grouting part (7) is in contact with the foundation.
5. The self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas according to claim 1, characterized in that: The lower end of the photovoltaic support foundation column (5) is connected to a pad (8), and the pad (8) is connected to the uppermost connecting threaded sleeve (4).
6. The self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas according to claim 1, characterized in that: The number of the second hollow anchor rod (2) is one, and the number of the connecting threaded sleeves (4) is two.
7. The self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas according to any one of claims 1 to 6, characterized in that: The drill bit (3) is a cross all-steel drill bit.
8. The self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas according to any one of claims 1 to 6, characterized in that: The height of the concrete pouring part (6) below the ground is 300 mm ± 100 mm.
9. The self-drilling hollow anchor pile photovoltaic support foundation for mountainous areas according to any one of claims 1 to 6, characterized in that: The distance between the upper end of the topmost connecting threaded sleeve (4) and the lower end of the drill bit (3) is greater than or equal to 2000 mm; the height of the concrete pouring part (6) is greater than or equal to 500 mm; the height of the part of the concrete pouring part (6) located above the ground is greater than or equal to 200 mm; the height of the part of the photovoltaic support foundation column (5) located below the ground is greater than or equal to 200 mm; the width of the concrete pouring part (6) is greater than or equal to 400 mm; and the diameter of the drill bit (3) is greater than or equal to 50 mm.