Photovoltaic support foundation construction method

Abstract

The present application is directed to the field of photovoltaic power generation technology, and provides a photovoltaic support foundation construction method, comprising the following steps: S1. Leveling the site; S2. GPS positioning: according to the requirements of the construction drawing, the micro prefabricated steel pile position of the photovoltaic component inner support foundation is positioned by GPS; S3. Piling; S4. Inclined drilling: while the air drilling machine drills the boulder, the micro prefabricated steel pile can be hit by the pile driver at any time; S5. Shifting and again inclined drilling: if there is a large-diameter boulder in front of the micro prefabricated steel pile, the air drilling machine is translated 300mm away from the pile position, and step 4 is cycled; S6. Reaching the burial depth. The present application effectively solves the situation that the micro prefabricated steel pile cannot be hit through when encountering a boulder during the hammering process, does not need to change the geological soil layer structure of the pile position, does not reduce the frictional resistance on both sides of the pile, ensures the stability of the foundation, reduces the construction difficulty, protects the interests of the owner and the contractor, and is very popular.

Description

Technical Field

[0001] This invention relates to a construction method for photovoltaic support foundations, belonging to the field of photovoltaic power generation technology. Background Technology

[0002] Solar energy is a clean and renewable energy source with abundant reserves. Solar photovoltaic power generation has few restrictions, is simple to develop, and produces no pollution, resulting in minimal environmental impact. Developing photovoltaic power generation not only promotes a revolution in energy production and consumption but also contributes to building a clean, low-carbon, safe, and efficient energy system, aligning with the development requirements of a modern low-carbon and green economy.

[0003] According to regulations, if a pile location encounters a boulder or other hard structure, it should be cleared before pile driving. A typical example is Chinese invention patent CN201210017378.3, which discloses a support foundation for a solar photovoltaic power station and its on-site construction method, which involves clearing the space before pouring concrete; or pre-drilling holes, pre-drilling holes 1 / 3 to 1 / 2 of the pile length before driving; a typical example is Chinese invention patent CN201610516961.7, which discloses a rock anchor foundation structure and its construction method for mountain photovoltaic modules, which involves drilling holes in the rock slope before construction.

[0004] However, the inventors of this invention patent discovered the following problems with the existing technology: Currently constructed and operating photovoltaic power plants do not utilize volcanic gravel strata for their support foundations. The geological structure of volcanic gravel layers is extremely complex, with numerous irregularly distributed, hard basaltic boulders beneath the seemingly flat gravel surface. Photovoltaic power generation module support foundations primarily use micropiles. Removing these boulders requires compaction and backfilling of the removed area, and the soil compaction must reach a certain density to ensure the stability of the steel piles. This inevitably increases the investment in equipment and raw materials. Even without increasing the amount of steel used, using concrete for reinforcement would also increase the investment in equipment and raw materials. If pre-drilling is used, the maximum pre-drilling depth can reach 700mm, but boulders are generally less than 800mm deep. For friction piles, increasing the pre-drilling depth cannot ensure pile stability. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a photovoltaic support foundation construction method that ensures foundation stability, reduces construction difficulty, and saves construction costs.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides a method for constructing a photovoltaic support foundation, comprising the following steps: S1. Site leveling: For photovoltaic modules located in areas with gentle geological conditions and volcanic gravel deposits on the surface, site leveling construction will be carried out. S2. GPS positioning: Locates the preset position of the miniature precast steel pile; S3. Piling: After positioning the piling machine, control the verticality of the micro precast steel piles within the allowable deviation range; operate the piling machine to drive the piles according to the design penetration requirements until an isolated boulder is encountered and then stop. S4. Inclined drilling: An air drilling rig is used to drill at an angle of 1.0±0.2m in the direction of force of the micro precast steel pile to break the boulder encountered at the front end of the micro precast steel pile; while the air drilling rig is drilling the boulder, a pile driver is used to drive the micro precast steel pile. S5. Displace and re-drill at an angle: If there is a large-diameter boulder at the front end of the micro precast steel pile, move the air drilling machine 300mm away from the pile position and repeat step S4 until the front end of the micro precast steel pile passes through the boulder or reaches the designed burial depth. S6. Reaching the burial depth: After the micro precast steel pile penetrates the front boulder, if the bottom of the micro precast steel pile has not reached the designed burial depth, the pile driving is repeated until the burial depth of the pile reaches the designed depth.

[0008] In step S1, large-diameter boulders are distributed in the lower part of the volcanic gravel site at a depth of 800mm to 1000mm.

[0009] The large-diameter boulders are boulders with a side length or maximum diameter of 300 mm or more.

[0010] The coordinates of the points in step S2 are marked with colored plastic, and the colored plastic is fixed with nails.

[0011] The micro precast steel piles in step S2 are friction piles, with a length of 1600mm, a designed burial depth of 1400mm, and 200mm exposed; the cross-section is "C", "H", or "I".

[0012] The miniature precast steel piles are treated for corrosion protection according to environmental humidity, temperature and light conditions.

[0013] In step S3, the piling machine is positioned when it reaches the preset position and is level and stable.

[0014] In step S3, a scale indicating the pile driving depth is set on the pile driving machine during pile driving. The pile driving depth is observed, recorded and controlled by the scale during the pile driving process.

[0015] In step S4, when drilling at an angle, the angle between the air drilling rig rod and the surface of the volcanic gravel site is 40°.

[0016] The penetration depth of the pile driving in steps S3 to S6 is 50mm / 10 blows.

[0017] The beneficial effects of this invention are as follows: it effectively solves the problem of micro precast steel piles being unable to penetrate isolated rocks during the hammering process, without changing the geological soil structure at the pile location, without reducing the frictional resistance on both sides of the pile, thus ensuring the stability of the foundation. It enables the micro precast steel piles to reach the design depth and pass the static load test on site, while also reducing the construction difficulty on the basis of foundation stability, protecting the interests of the owner and contractor, and is highly worthy of promotion. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the cross-section of the front end of the precast steel pile of the photovoltaic module support foundation encountering a boulder, as shown in this invention. Figure 2 This is a schematic diagram of the front end of the miniature precast steel pile shown in this invention before it penetrates the boulder; Figure 3 This is a schematic diagram of the miniature precast steel pile after the front end penetrates the boulder as shown in this invention; In the diagram: 1-Miniature precast steel pile, 2-Volcanic gravel site, 3-Air drill, 4-Layer of isolated boulders and gravel containing basalt, 5-Large-diameter isolated boulder. Detailed Implementation

[0019] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0020] The first embodiment of the present invention relates to a construction method for photovoltaic support foundations, such as... Figures 1 to 3 As shown, it includes the following steps: S1. Site leveling: Based on the detailed design requirements and the characteristics of the construction machinery, the surface of the volcanic gravel site 2 inside the photovoltaic modules will be leveled to facilitate the entry of construction machinery for construction. S2. GPS Positioning: According to the construction drawings, GPS positioning is performed on the micro precast steel pile 1 of the photovoltaic module internal support foundation. The accuracy of the positioning coordinates is controlled according to the accuracy required by the construction drawings. GPS positioning can accurately find the coordinates of micro precast steel pile 1. The accuracy of the coordinates must meet the design requirements, otherwise it will cause cumulative errors in the later stages. S3. Piling: After the piling machine is in place, the allowable deviation of the verticality of the micro precast steel pile 1 is controlled according to the design requirements; piling work is carried out normally according to the design penetration requirements. When encountering a boulder, piling is stopped. The verticality deviation is very important, as it relates to whether the micro precast steel pile 1 will be driven off-center, affecting the installation of photovoltaic modules later; when encountering a boulder, piling is stopped, and preparation is made to use the air drilling machine 3 to perform inclined drilling. S4. Inclined Drilling: An air drilling rig 3 is used to drill an inclined hole at a distance of approximately 1.0m in the direction of force application of the micro precast steel pile 1 to break through the boulder encountered at the front end of the micro precast steel pile 1. While the air drilling rig 3 is drilling the boulder, the pile driver can be used to drive the micro precast steel pile 1 at any time. The inclined drilling can break through the boulder from another direction, and the distance of the inclined drilling is adjusted according to the size of the boulder. The simultaneous drilling of the boulder by the air drilling rig 3 and the pile driver increases the possibility of breaking the boulder. S5. Displace and re-drill at an angle: If there is a large-diameter boulder 5 at the front end of the micro precast steel pile 1, move the air drilling machine 3300mm away from the pile position and repeat step 4 until the front end of the micro precast steel pile 1 passes through the boulder or reaches the design depth; if a large-diameter boulder is encountered, the distance of the air drilling machine 3 will be adjusted. S6. Reaching the embedment depth: After the micro precast steel pile 1 penetrates the front boulder 5, if the bottom of the micro precast steel pile 1 has not yet reached the designed embedment depth, the pile driving operation continues until the embedment depth of the pile reaches the designed depth of 1400mm, with the designed depth of 1400mm as the final goal.

[0021] The second embodiment of the present invention is largely the same as the first embodiment, except that in step S1, large-diameter boulders 5 are distributed in the lower 800mm to 1000mm depth range of the volcanic gravel site 2. The construction technique that can pre-drill to a maximum depth of 700mm cannot be implemented in the environment of the volcanic gravel site 2, and a new construction technique needs to be found.

[0022] Furthermore, the large-diameter boulder 5 is a boulder with a side length or maximum diameter of 300mm or more. Boulders of this diameter are harder, and the miniature precast steel pile 1 is difficult to penetrate the boulder when driven by the pile driver alone. It is necessary to use the air drilling machine 3 to drill and break through the boulder from another direction.

[0023] Furthermore, the coordinates of the points in step S2 should be marked with colored plastic, and the colored plastic should be fixed with nails. The colored plastic markings are eye-catching and easy to identify, and fixing them with nails can prevent the colored plastic markings from changing position due to strong winds or other factors, which would affect the accuracy of subsequent construction.

[0024] Furthermore, in step S2, the miniature precast steel pile 1 is a friction pile with a length of 1600mm, a designed burial depth of 1400mm, and an exposed length of 200mm; the cross-section is "C", "H", or "I". The choice of which cross-section the miniature precast steel pile 1 has is determined by the local steel manufacturer's supply capacity, cost, etc., and the strength must meet the requirements of the specification analysis.

[0025] Furthermore, the anti-corrosion scheme of the micro precast steel pile 1 is determined according to the humidity, temperature and light of the local environment, which can effectively ensure that the micro precast steel pile 1 will not corrode for a long time in the local environment and increase its service life.

[0026] The third embodiment of the present invention is largely the same as the first embodiment, except that in step S3, the position of the pile driver equipment after it is in place must be level and stable to ensure that it does not tilt or move during construction. Otherwise, the micro precast steel pile 1 will be driven crooked or off-center, failing to meet the construction accuracy requirements and wasting time and effort.

[0027] Furthermore, in step S3, when driving piles, a scale for controlling the depth should be set on the pile driving machine. During the pile driving process, the penetration depth of the control pile should be observed and recorded. This facilitates real-time observation of the driving depth of the micro precast steel pile 1, ensuring that the pile driving depth is not too deep to cause waste, nor too shallow to meet the construction requirements.

[0028] Furthermore, during the inclined drilling in step S4, the angle between the drill rod of the air drill 3 and the surface of the volcanic gravel site 2 is 40°. Theoretically, when the angle is 40°, the boulder is subjected to the greatest force and is most prone to cracking, and this has been verified by a large number of practical experiments.

[0029] Furthermore, the piling process in steps S3 to S6 is controlled by the penetration depth, which is controlled at 50mm / 10 blows. The penetration depth refers to the depth to which the penetrator enters the soil when it is driven by gravity, that is, to ensure that the micro precast steel pile 1 descends by 5mm with each blow of the piling machine.

Claims

1. A method for constructing a photovoltaic support foundation, characterized in that, Includes the following steps: S1. Site leveling: For photovoltaic module volcanic gravel sites (2) with gentle geological conditions and volcanic lava deposits on the surface, site leveling construction shall be carried out; S2. GPS positioning: Positioning the micro precast steel pile (1) at the preset location; S3. Piling: After the piling machine is in place, control the verticality of the micro precast steel pile (1) within the allowable deviation range; operate the piling machine to drive the pile according to the design penetration requirements until it encounters a boulder and stops. S4. Inclined drilling: An air drilling machine (3) is used to drill an inclined hole at a distance of 1.0±0.2m to the side of the micro precast steel pile (1) to break the boulder encountered at the front end of the micro precast steel pile (1); while drilling the boulder, the air drilling machine (3) is used to drive the micro precast steel pile (1) with a pile driver. S5. Displace and drill again at an angle: If there is a boulder (5) at the front end of the micro precast steel pile (1), move the air drilling machine (3) 300mm away from the pile position and repeat step S4 until the front end of the micro precast steel pile (1) passes through the boulder or reaches the designed burial depth. S6. Reaching the burial depth: After the micro precast steel pile (1) penetrates the front boulder (5), if the bottom of the micro precast steel pile (1) has not reached the designed burial depth, the pile driving is repeated until the burial depth of the pile reaches the designed depth.

2. The photovoltaic support foundation construction method as described in claim 1, characterized in that: In step S1, isolated boulders (5) are distributed in the lower 800mm to 1000mm depth range of the volcanic gravel site (2).

3. The photovoltaic support foundation construction method as described in claim 2, characterized in that: The solitary rock (5) is a solitary rock with a side length or maximum diameter of 300 mm or more.

4. The photovoltaic support foundation construction method as described in claim 1, characterized in that: The coordinates of the points in step S2 are marked with colored plastic, and the colored plastic is fixed with nails.

5. The photovoltaic support foundation construction method as described in claim 1, characterized in that: In step S2, the micro precast steel pile (1) is a friction pile with a length of 1600mm, a designed burial depth of 1400mm, and an exposed length of 200mm; the cross-section is "C", "H", or "I".

6. The photovoltaic support foundation construction method as described in claim 5, characterized in that: The micro precast steel piles (1) are subjected to anti-corrosion treatment according to environmental humidity, temperature and light conditions.

7. The photovoltaic support foundation construction method as described in claim 1, characterized in that: In step S3, the piling machine is positioned when it reaches the preset position and is level and stable.

8. The photovoltaic support foundation construction method as described in claim 1, characterized in that: In step S3, a scale indicating the pile driving depth is set on the pile driving machine during pile driving. The pile driving depth is observed, recorded and controlled by the scale during the pile driving process.

9. The photovoltaic support foundation construction method as described in claim 1, characterized in that: In step S4, when drilling at an angle, the drill rod of the air drill (3) is at an angle of 40° to the surface of the volcanic gravel site (2).

10. The photovoltaic support foundation construction method as described in claim 1, characterized in that: The penetration depth of the pile driving in steps S3 to S6 is 50mm / 10 blows.

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