Volcanic sand gravel geology photovoltaic support foundation and construction method thereof

Abstract

The invention relates to the technical field of supporting structures of photovoltaic modules, and provides a volcanic sand gravel geology photovoltaic support foundation and a construction method thereof.The volcanic sand gravel geology photovoltaic support foundation comprises miniature steel piles; the miniature steel piles are vertically inserted into the sand gravel layer, steel pile bottom concrete wraps and is poured at the bottom ends of the miniature steel piles, pile periphery ground concrete wraps and is poured at the positions, located on the ground surface of the sand gravel layer, of the middle sections of the miniature steel piles, and the pile periphery ground concrete is flush with the upper surface of the ground surface. Temperature ribs are distributed on the surface layer of the top face of the pile periphery ground concrete and bent downwards from the side face of the pile periphery ground concrete. The invention further provides a volcanic sand gravel geology photovoltaic support foundation construction method. The problem of suitability of the micro steel pile in volcanic sand gravel geology can be effectively solved, especially in high-altitude remote areas, the problem that the difficulty of external material supply is large is solved, the material utilization amount can be properly reduced, and the construction difficulty is reduced.

Description

Technical Field

[0001] The invention relates to a volcanic gravel geological photovoltaic support foundation and a construction method thereof, belonging to the technical field of supporting structures of photovoltaic modules. Background Art

[0002] Solar energy is a clean and renewable energy source with abundant reserves. Solar photovoltaic power generation has fewer restrictions, is simple to develop, and has a pollution-free power generation process with little impact on the environment. The development of photovoltaic power generation is not only conducive to promoting the revolution in energy production and consumption, but also conducive to building a clean, low-carbon, safe and efficient energy system, which meets the development requirements of modern low-carbon economy and green economy.

[0003] The support foundation of the photovoltaic power plant currently under construction and operation does not involve volcanic gravel strata. The geological structure of the volcanic gravel layer is very complex. Under the seemingly flat gravel surface, there are many irregular basaltic hard boulders. In view of this, it is very inappropriate to use a single structural form for the photovoltaic support foundation. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a volcanic gravel geological photovoltaic support foundation and a construction method thereof. The volcanic gravel geological photovoltaic support foundation can effectively solve the problems of high cost, poor overall stability, and great construction difficulty existing in the prior art using a single pile type, especially under harsh construction conditions such as high altitudes and remote areas, and can better reflect the advantages of low difficulty, low cost, and high stability.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a volcanic gravel geological photovoltaic support foundation, comprising a micro steel pile; the micro steel pile is vertically inserted into the gravel layer, the bottom end of the micro steel pile is wrapped and cast with steel pile bottom concrete, the middle section of the micro steel pile is located at the ground surface of the gravel layer and is wrapped and cast with pile surrounding ground concrete, the pile surrounding ground concrete is flush with the upper surface of the ground surface, the top surface layer of the pile surrounding ground concrete is provided with temperature ribs and the temperature ribs are bent downward from the side of the pile surrounding ground concrete.

[0007] The gravel layer is interspersed with basaltic boulders.

[0008] The ground concrete around the piles and the concrete at the bottom of the steel piles are both C30 fine stone concrete.

[0009] The concrete at the bottom of the steel pile is in an inverted cone shape.

[0010] The temperature ribs are welded and fixed to the micro steel piles.

[0011] The present invention also provides a volcanic gravel geological photovoltaic support foundation construction method, which adopts the following steps to construct the volcanic gravel geological photovoltaic support foundation as described above:

[0012] S1. Positioning: Level the site according to the design drawing, and then mark the expected points according to GPS positioning;

[0013] S2. Drilling inspection: Use drilling equipment to drill holes at the expected points to the designed depth, and use fine steel bars to check the quality of the holes;

[0014] S3. Casting and hammering: Pour concrete at the bottom of the micro steel pile at the end of the micro steel pile. When the strength of the concrete at the bottom of the steel pile reaches a preset proportion of the design strength, hammer the micro steel pile to the design depth:

[0015] S4. Excavation: Excavate around the micro steel piles, and the excavation range should be consistent with the designed size of the ground concrete around the piles;

[0016] S5. Fixed pouring: Weld fixed temperature reinforcement on the micro steel pile, then pour the ground concrete around the pile, vibrate while pouring, and then maintain the ground concrete around the pile until it reaches the designed strength.

[0017] The temperature reinforcement is made of 8mm steel mesh, the depth of the top surface of the temperature reinforcement relative to the ground surface is 20mm, and the total height of the temperature reinforcement is 200mm.

[0018] In step S3, the pouring height of concrete at the bottom of the steel pile is 300 mm.

[0019] In step S3, the preset ratio is 50%.

[0020] In the step S1, the expected points are marked by using colored plastic labels and fixing them with nails.

[0021] The beneficial effects of the present invention are that it can effectively solve the problem of the suitability of micro steel piles in volcanic gravel geology, especially in remote areas at high altitudes, solve the problem of difficulty in external material supply, properly reduce material utilization, and reduce construction difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the structure of at least one embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of the ground concrete around the center pile.

[0024] In the figure: 1- micro steel pile, 2- ground surface, 3- temperature reinforcement, 4- gravel layer, 5- ground concrete around the pile, 6- concrete at the bottom of the steel pile. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0026] A first embodiment of the present invention relates to Figure 1 , Figure 2 A volcanic gravel geological photovoltaic support foundation shown in FIG. 1 includes a micro steel pile 1; the micro steel pile 1 is vertically inserted into a gravel layer 4, the bottom end of the micro steel pile 1 is wrapped and cast with steel pile bottom concrete 6, the middle section of the micro steel pile 1 is located at the ground surface 2 of the gravel layer 4 and is wrapped and cast with pile surrounding ground concrete 5, the pile surrounding ground concrete 5 is flush with the upper surface of the ground surface 2, the top surface layer of the pile surrounding ground concrete 5 is provided with temperature ribs 3 and the temperature ribs 3 are bent downward from the side of the pile surrounding ground concrete 5.

[0027] The second embodiment of the present invention is substantially the same as the first embodiment, mainly in that basaltic boulders are interspersed in the gravel layer 4 .

[0028] Furthermore, the ground concrete 5 around the pile and the concrete 6 at the bottom of the steel pile are both C30 fine stone concrete.

[0029] Furthermore, the concrete 6 at the bottom of the steel pile is in the shape of an inverted cone.

[0030] Furthermore, the temperature ribs 3 are welded and fixed to the micro steel piles 1 .

[0031] The third embodiment of the present invention relates to a volcanic gravel geological photovoltaic support foundation construction method, which is constructed by the following steps to obtain the first embodiment or the second embodiment:

[0032] S1. Positioning: Level the site according to the design drawing, and then mark the expected points according to GPS positioning;

[0033] S2. Drilling inspection: Use drilling equipment to drill holes at the expected points to the designed depth, and use fine steel bars to check the quality of the holes;

[0034] S3, pouring and hammering: pour concrete 6 at the bottom of the steel pile at the end of the micro steel pile 1. When the strength of the concrete 6 at the bottom of the steel pile reaches a preset proportion of the design strength, hammer the micro steel pile 1 to the design depth:

[0035] S4, excavation: excavation is carried out around the micro steel pile 1, and the excavation range is consistent with the designed size of the ground concrete 5 around the pile;

[0036] S5, fixed pouring: welding and fixing the temperature reinforcement 3 on the micro steel pile 1, and then pouring the ground concrete 5 around the pile, vibrating while pouring, and then curing the ground concrete 5 around the pile until it reaches the designed strength.

[0037] The fourth embodiment of the present invention is substantially the same as the first embodiment, mainly in that the temperature ribs 3 are made of 8 mm steel mesh, the depth of the top surface of the temperature ribs 3 relative to the ground surface 2 is 20 mm, and the total height of the temperature ribs 3 is 200 mm.

[0038] Furthermore, in step S3, the pouring height of the concrete 6 at the bottom of the steel pile is 300 mm.

[0039] Furthermore, in step S3, the preset ratio is 50%.

[0040] Furthermore, in step S1, the expected points are marked by using colored plastic labels and fixing them with nails.

[0041] The fifth implementation mode of the present invention is combined with the above implementation modes, and specifically distinguishes between the design stage and the construction stage, namely:

[0042] Phase 1: Support foundation design:

[0043] 1) The support foundation adopts a mixed form of concrete and micro steel piles. The concrete consists of two parts: the bottom of the micro steel pile and the ground part. The surface of the concrete in the ground part is equipped with temperature ribs to prevent concrete cracking, and the temperature ribs and micro steel piles are welded into one.

[0044] 2) The strength of micro steel piles is determined based on the specification analysis, and the form can be "C" or "H" or round or other forms of steel, which are selected by the local steel manufacturer's supply capacity, cost, etc.

[0045] 3) Determine the anti-corrosion plan for micro steel piles and steel plates based on the local regional environment.

[0046] 4) The diameter of the drill hole is smaller than the maximum side length or diameter of the micro steel pile, and the depth is the length of the micro steel pile. The length of the micro steel pile is determined according to the specifications.

[0047] 4) C30 fine stone concrete is used for concrete. The concrete height is 300mm. When the micro steel pile is driven in, the concrete is squeezed to form an inverted cone-shaped concrete body, which increases the friction between the micro steel pile and the gravel layer on both sides and improves the vertical pull-out bearing capacity of the micro steel pile.

[0048] 5) The size of the concrete is determined by calculation and analysis based on regional geology, wind speed and other conditions, and can also be determined by on-site pull-out tests. The surface layer is equipped with temperature reinforcement, the diameter of the reinforcement is 8mm, the reinforcement protection layer is 20mm, all are bent downward, and the anchor length is 200mm deep into the concrete.

[0049] 6) The diameter of the drill rod of the drilling equipment must be smaller than the maximum side length or diameter of the micro steel pile.

[0050] Phase 2: Micro steel pile construction:

[0051] 1) Level the site inside the photovoltaic string according to the detailed design requirements and the characteristics of the construction machinery.

[0052] 2) According to the detailed design requirements, the micro steel piles of the support foundation inside the photovoltaic string are positioned by GPS, the point coordinates are controlled according to the accuracy required by the design, and marked with colored plastic, which is fixed with nails.

[0053] 3) After the drilling equipment is in place, it must be flat and stable to ensure that it does not tilt or move during construction, and the verticality tolerance should be controlled according to the design requirements. In order to accurately control the drilling depth, a depth control scale should be made on the drilling equipment to facilitate observation and recording during the construction process.

[0054] 4) After each micro steel pile is drilled, C30 fine stone concrete is poured into the bottom in time, and the pouring height is controlled at 300mm.

[0055] 5) Before pouring the bottom concrete, first use a thin steel bar to check the quality of the hole.

[0056] 6) When the bottom concrete reaches 50% of the design strength, the micro steel piles are hammered in. The depth of the hammered piles is controlled by the design elevation of the micro steel.

[0057] 7) After the micro steel piles are driven in, gravel excavation is carried out on the ground around the micro steel piles. The excavation range meets the concrete size requirements of the detailed design.

[0058] 8) Make a steel mesh with a diameter of 8mm. The vertical and horizontal spacing and row spacing are appropriately determined according to the concrete size and the outer cross-section requirements of the micro steel pile. The reinforced concrete protective layer is controlled at 20mm, and the steel mesh production and anchorage length meet the design requirements.

[0059] 9) After the steel mesh is fixed according to the design requirements, pour C30 fine stone concrete on the ground around the micro steel pile. The pouring of concrete must be continuous and vibrated while pouring to ensure that the concrete is in full contact with the outer surface of the micro steel pile.

[0060] 10) The concrete on the ground shall be cured according to the design requirements until it reaches the design strength.

Claims

1. A volcanic gravel geological photovoltaic support foundation, comprising a micro steel pile (1), characterized in that: The micro steel pile (1) is vertically inserted into the gravel layer (4), the bottom of the micro steel pile (1) is wrapped and cast with steel pile bottom concrete (6), the middle section of the micro steel pile (1) is located at the ground surface (2) of the gravel layer (4) and is wrapped and cast with pile surrounding ground concrete (5), the pile surrounding ground concrete (5) is flush with the upper surface of the ground surface (2), the top surface layer of the pile surrounding ground concrete (5) is provided with temperature ribs (3), and the temperature ribs (3) are bent downward from the side of the pile surrounding ground concrete (5).

2. The volcanic gravel geological photovoltaic support foundation according to claim 1, characterized in that: The gravel layer (4) is interspersed with basaltic boulders.

3. The volcanic gravel geological photovoltaic support foundation according to claim 1, characterized in that: The ground concrete (5) around the pile and the concrete (6) at the bottom of the steel pile are both C30 fine stone concrete.

4. The volcanic gravel geological photovoltaic support foundation according to claim 1, characterized in that: The concrete (6) at the bottom of the steel pile is in an inverted cone shape.

5. The volcanic gravel geological photovoltaic support foundation according to claim 1, characterized in that: The temperature rib (3) is welded and fixed to the micro steel pile (1).

6. A volcanic gravel geological photovoltaic support foundation construction method, characterized in that: The volcanic gravel geological photovoltaic support foundation according to any one of claims 1 to 5 is constructed by the following steps: S1. Positioning: Level the site according to the design drawing, and then mark the expected points according to GPS positioning; S2. Drilling inspection: Use drilling equipment to drill holes at the expected points to the designed depth, and use fine steel bars to check the quality of the holes; S3, pouring and hammering: pouring concrete (6) at the bottom of the steel pile at the end of the micro steel pile (1), and when the strength of the concrete (6) at the bottom of the steel pile reaches a preset proportion of the design strength, hammering the micro steel pile (1) to the design depth: S4, excavation: excavation is performed around the micro steel pile (1), and the excavation range is consistent with the designed size of the ground concrete (5) around the pile; S5, fixed pouring: welding fixed temperature ribs (3) on the micro steel pile (1), then pouring the ground concrete (5) around the pile, vibrating while pouring, and then curing the ground concrete (5) around the pile until it reaches the designed strength.

7. The volcanic gravel geological photovoltaic support foundation according to claim 6, characterized in that: The temperature ribs (3) are made of 8 mm steel mesh, the depth of the top surface of the temperature ribs (3) relative to the ground surface (2) is 20 mm, and the total height of the temperature ribs (3) is 200 mm.

8. The volcanic gravel geological photovoltaic support foundation according to claim 6, characterized in that: In step S3, the pouring height of the concrete (6) at the bottom of the steel pile is 300 mm.

9. The volcanic gravel geological photovoltaic support foundation according to claim 6, characterized in that: In step S3, the preset ratio is 50%.

10. The volcanic gravel geological photovoltaic support foundation according to claim 6, characterized in that: In the step S1, the expected points are marked by using colored plastic labels and fixing them with nails.

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