Construction method of photovoltaic support micro pile suitable for karst site with local collapse risk

Abstract

The invention discloses a construction method of a photovoltaic support micro pile suitable for a karst site with a local collapse risk. The method comprises the steps that 1, data are collected, and a model is built; step 2, risk assessment; step 3, construction preparation; step 4, leveling the field; step 5, measuring and positioning; and 6, drilling construction is conducted. 7, casing grouting is conducted; eighthly, ground anchor piles are installed; 9, concrete is poured; step 10, vibrating and tamping; and 11, grouting is conducted after the pile is formed. The method has the beneficial effects of reducing collapse risks and guaranteeing construction safety. The method is suitable for rugged topography. And the galvanized steel pipe can play a tensile role to a certain extent, the number of lower steel bars can be reduced, and construction materials are reduced. The influence on the local environment is reduced to a certain extent, and the ecological environment is effectively protected.

Description

Technical Field

[0001] The present invention relates to a construction method for a photovoltaic support micropile, and in particular to a construction method for a photovoltaic support micropile suitable for a karst site with a risk of local collapse. Background Art

[0002] Currently, with the rapid growth of global demand for renewable energy, photovoltaic power generation, as an important component of clean energy, has become a key direction for energy transformation through large-scale construction. Photovoltaic power stations typically require large-scale pile foundations to support the photovoltaic module mounting system. However, in areas with widespread karst landforms, photovoltaic projects often face complex geological challenges. The widespread development of caves, soil holes, cracks, and loose overburden in karst strata can easily lead to local collapse and insufficient bearing capacity during or after pile foundation construction, seriously threatening the safety and economic viability of the project. Therefore, a new pile foundation construction method that integrates refined exploration and adaptive construction technology is urgently needed to ensure the safety, economy, and construction efficiency of photovoltaic pile foundations in karst areas. Summary of the Invention

[0003] The main purpose of the present invention is to solve the problems of caves, soil holes, cracks and loose covering layers that are widely developed in karst strata, which can easily lead to local collapse and insufficient bearing capacity during or in the later stage of pile foundation construction, seriously threatening the safety and economy of the project. A construction method for photovoltaic support micropiles suitable for karst sites with local collapse risks is provided.

[0004] The present invention provides a method for constructing photovoltaic support micropiles suitable for karst sites with local collapse risks, and the method comprises the following steps:

[0005] Step 1: Data collection and model construction: Data collection is carried out at the construction site, and the obtained data is used to construct a three-dimensional model through software;

[0006] Step 2: Risk assessment: Extract features from the 3D model obtained in step 1 and generate a risk zoning map by overlaying geological maps and hydrological data.

[0007] Step 3, Construction Preparation: Remove any debris that may affect the construction and place the anchor piles at the designated location. The anchor piles consist of a steel sleeve and a steel cage. The steel sleeve is a galvanized steel pipe mounted on top of the steel cage, and the steel cage is surrounded by three longitudinal main bars and six stirrups.

[0008] Step 4: Level the site: Level and compact the site according to the actual situation on site;

[0009] Step 5: Measurement and positioning: According to the on-site measurement control network and the pile position map of the test pile, the pile position is placed, and a positioning pile is driven into the center of the measured pile position as a mark;

[0010] Step 6: Drilling construction: Align the center of the drilling tool of the drilling machine with the positioning pile and start the drill bit to operate.

[0011] Step 7: Casing grouting: For construction sites with medium or high risk assessment levels, casing is installed inside the anchor piles, and removable grouting pipes are pre-buried on the outside. After the pile body is installed, cement slurry is injected through the grouting pipe to form a pile-soil synergistic reinforcement layer;

[0012] Step 8: Install the anchor pile: First, place the steel cage that makes up the anchor pile in the center of the pile hole, then assemble the galvanized steel pipe that makes up the anchor pile on the top of the steel cage and use the positioning device to fix the galvanized steel pipe in the center of the pile hole;

[0013] Step 9: Pouring concrete: straighten the anchor piles and pour concrete evenly around the anchor piles;

[0014] Step 10: Vibration: Use an inserted vibrating rod to compact the material;

[0015] Step 11: Grouting after pile formation: For construction sites with medium and high risk assessment levels, after the pile concrete hardens, high-pressure grouting is performed on the soil around the pile through pre-buried grouting pipes.

[0016] The specific process of data collection and model construction in step 1 is as follows:

[0017] GCPs were evenly distributed according to the size of the construction site, and routes were planned for the construction site, with a heading overlap of 80% and a lateral overlap of 75%. Drone oblique photography was used to capture all-around footage of the construction site, obtaining accurate photos, POS data, and GCP coordinates. This data was then imported into ContextCapture software for aerial triangulation and precision optimization to construct a 3D model, resulting in DSM and DOM data.

[0018] The specific process of risk assessment in step 2 is as follows:

[0019] The obtained three-dimensional model and DSM / DOM data are used to extract the characteristics of slope, curvature and elevation through ArcGIS software. By overlaying geological maps and hydrological data, the comprehensive risk of the construction site is divided into low, medium and high levels, and a risk zoning map is generated.

[0020] The specific process of installing the anchor piles in step 8 is as follows:

[0021] First, place the steel cage that makes up the anchor pile in the center of the pile hole, then assemble the galvanized steel pipe that makes up the anchor pile on the top of the steel cage, and then use the positioning device to fix the galvanized steel pipe in the center of the pile hole. The positioning device includes a pile position fixing plate, a clamping mechanism and a driving mechanism. First, place the customized pile position fixing plate at the position of the pile hole. After determining the position of the pile hole, connect the clamping plate on the fixed baffle of the clamping mechanism with the protrusion on the top of the pile position fixing plate, and then fix the fixed baffle to the ground through the fixing nails at the bottom of the slide rails on both sides of the clamping mechanism, and then fix the pile position. After the plate is taken out, the support on the driving mechanism is placed on the ground, the telescopic rod on the driving mechanism is assembled on the support, and then the top rod on the telescopic rod is aligned with the driving port on the clamping mechanism by observing the level bubble on the telescopic rod and the telescopic rod is adjusted to keep it level. The start button of the RF remote control that controls the electric device is pressed, and the flow of liquid in the hydraulic pipe and hydraulic cylinder on the driving mechanism pushes the top rod at the top of the telescopic rod to extend and retract, thereby driving the slide on the clamping mechanism to move forward along the slide rail until the galvanized steel pipe that needs to be embedded on the anchor pile is clamped and fixed.

[0022] Beneficial effects of the present invention:

[0023] The construction method of photovoltaic support micro-piles provided by the present invention, which is suitable for karst sites with local collapse risks, generates a risk zoning map by constructing a three-dimensional model, and performs special treatment on medium and high-risk areas to reduce the risk of collapse and ensure construction safety. The present invention fixes the galvanized steel pipe by a fixing device to ensure that the galvanized steel pipe always remains vertical and is located in the center of the hole during construction, thereby ensuring the thickness of the steel bar protective layer and improving the construction quality. It can also better connect with the upper photovoltaic support by adjusting the height of the anchor pile, and is suitable for undulating terrain. In addition, the galvanized steel pipe can play a tensile role to a certain extent, can reduce the number of lower steel bars, and reduce construction materials. The present invention will backfill and maintain the soil after pile formation, which reduces the impact on the local environment to a certain extent and effectively protects the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a flow chart of the construction method of the photovoltaic support micro pile according to the present invention.

[0025] Figure 2 This is a schematic diagram of the anchor pile structure of the present invention.

[0026] Figure 3 This is a schematic diagram of the arrangement of the ground anchor piles described in the present invention.

[0027] Figure 4 It is a schematic diagram of the overall structure of the positioning device described in the present invention.

[0028] Figure 5 This is a schematic structural diagram of the pile position fixing plate described in the present invention.

[0029] The annotations in the image above are as follows:

[0030] 1. Galvanized steel pipe 2. Steel cage 3. Pile fixing plate 4. Fixed baffle

[0031] 5. Clamp 6. Protrusion 7. Slide rail 8. Fixing nail 9. Support

[0032] 10. Telescopic rod 11. Level bubble 12. Drive port 13. Electric device

[0033] 14. RF remote control 15. Hydraulic pipe 16. Hydraulic cylinder 17. Slide plate. DETAILED DESCRIPTION

[0034] See also Figures 1 to 5 As shown:

[0035] The present invention provides a method for constructing photovoltaic support micropiles suitable for karst sites with local collapse risks, and the method comprises the following steps:

[0036] Step 1: Data collection and model construction: Data collection is carried out at the construction site, and the obtained data is used to construct a three-dimensional model through software;

[0037] Step 2: Risk assessment: Extract features from the 3D model obtained in step 1 and generate a risk zoning map by overlaying geological maps and hydrological data.

[0038] Step 3, construction preparation: remove the debris that affects the construction, and place the anchor piles in the designated location. The anchor piles are composed of a steel sleeve and a steel cage 2. The steel sleeve is assembled on the upper part of the steel cage 2. The steel sleeve is a galvanized steel pipe 1. The steel cage 2 is surrounded by three longitudinal main bars and six stirrups.

[0039] Step 4: Level the site: Level and compact the site according to the actual situation on site;

[0040] Step 5: Measurement and positioning: According to the on-site measurement control network and the pile position map of the test pile, the pile position is placed, and a positioning pile is driven into the center of the measured pile position as a mark;

[0041] Step 6: Drilling construction: Align the center of the drilling tool of the drilling machine with the positioning pile and start the drill bit to operate.

[0042] Step 7: Casing grouting: For construction sites with medium or high risk assessment levels, casing is installed inside the anchor piles, and removable grouting pipes are pre-buried on the outside. After the pile body is installed, cement slurry is injected through the grouting pipe to form a pile-soil synergistic reinforcement layer;

[0043] Step 8: Install the anchor pile: first place the steel cage 2 that makes up the anchor pile in the center of the pile hole, then assemble the galvanized steel pipe 1 that makes up the anchor pile on the top of the steel cage 2, and then use the positioning device to fix the galvanized steel pipe 1 in the center of the pile hole;

[0044] Step 9: Pouring concrete: straighten the anchor piles and pour concrete evenly around the anchor piles;

[0045] Step 10: Vibration: Use an inserted vibrating rod to compact the material.

[0046] Step 11: Grouting after pile formation: For construction sites with medium and high risk assessment levels, after the pile concrete hardens, high-pressure grouting is performed on the soil around the pile through pre-buried grouting pipes.

[0047] The specific process of data collection and model construction in step 1 is as follows:

[0048] GCPs were evenly distributed according to the size of the construction site, and routes were planned for the construction site, with a heading overlap of 80% and a lateral overlap of 75%. Drone oblique photography was used to capture all-around footage of the construction site, obtaining accurate photos, POS data, and GCP coordinates. This data was then imported into ContextCapture software for aerial triangulation and precision optimization to construct a 3D model, resulting in DSM and DOM data.

[0049] The specific process of risk assessment in step 2 is as follows:

[0050] The obtained three-dimensional model and DSM / DOM data are used to extract the characteristics of slope, curvature and elevation through ArcGIS software. By overlaying geological maps and hydrological data, the comprehensive risk of the construction site is divided into low, medium and high levels, and a risk zoning map is generated.

[0051] The specific process of installing the anchor piles in step 8 is as follows:

[0052] First, place the steel cage 2 that makes up the anchor pile in the center of the pile hole, then assemble the galvanized steel pipe 1 that makes up the anchor pile on the top of the steel cage 2, and then use the positioning device to fix the galvanized steel pipe 1 at the center of the pile hole. The positioning device includes a pile position fixing plate 3, a clamping mechanism and a driving mechanism. First, place the customized pile position fixing plate 3 at the position of the pile hole, and after determining the position of the pile hole, connect the clamping plate 5 on the fixed baffle 4 on the clamping mechanism with the protrusion 6 at the top of the pile position fixing plate 3, and then fix the fixed baffle 4 to the ground through the fixing nails 8 at the bottom of the slide rails 7 on both sides of the clamping mechanism, and then take out the pile position fixing plate 3. Place the support 9 on the driving mechanism on the ground, assemble the telescopic rod 10 on the driving mechanism on the support 9, and then align the top rod on the telescopic rod 10 with the driving port 12 on the clamping mechanism by observing the level bubble 11 on the telescopic rod 10 and adjust the telescopic rod 10 to keep it horizontal. Press the start button of the RF remote control 14 that controls the electric device 13, and the flow of liquid in the hydraulic pipe 15 and the hydraulic cylinder 16 on the driving mechanism pushes the top rod at the top of the telescopic rod 10 to extend and retract, thereby driving the slide 17 on the clamping mechanism to move forward along the slide rail 7 until the galvanized steel pipe 1 that needs to be embedded on the anchor pile is clamped and fixed.

Claims

1. A method for constructing photovoltaic support micropiles suitable for karst sites with local collapse risks, characterized by: The method includes the following steps: Step 1: Data collection and model construction: Data collection is carried out at the construction site, and the obtained data is used to construct a three-dimensional model through software; Step 2: Risk assessment: Extract features from the 3D model obtained in step 1 and generate a risk zoning map by overlaying geological maps and hydrological data. Step 3, Construction Preparation: Remove any debris that may affect the construction and place the anchor piles at the designated location. The anchor piles consist of a steel sleeve and a steel cage. The steel sleeve is a galvanized steel pipe mounted on top of the steel cage, and the steel cage is surrounded by three longitudinal main bars and six stirrups. Step 4: Level the site: Level and compact the site according to the actual situation on site; Step 5: Measurement and positioning: According to the on-site measurement control network and the pile position map of the test pile, the pile position is placed, and a positioning pile is driven into the center of the measured pile position as a mark; Step 6: Drilling: Align the center of the drilling tool of the drilling machine with the positioning pile and start the drill bit to operate; Step 7: Casing grouting: For construction sites with medium or high risk assessment levels, casing is installed inside the anchor piles, and removable grouting pipes are pre-buried on the outside. After the pile body is installed, cement slurry is injected through the grouting pipe to form a pile-soil synergistic reinforcement layer; Step 8: Install the anchor pile: First, place the steel cage that makes up the anchor pile in the center of the pile hole, then assemble the galvanized steel pipe that makes up the anchor pile on the top of the steel cage and use the positioning device to fix the galvanized steel pipe in the center of the pile hole; Step 9: Pouring concrete: straighten the anchor piles and pour concrete evenly around the anchor piles; Step 10: Vibration: Use an inserted vibrating rod to compact the material. Step 11: Grouting after pile formation: For construction sites with medium and high risk assessment levels, after the pile concrete hardens, high-pressure grouting is performed on the soil around the pile through pre-buried grouting pipes.

2. The method for constructing photovoltaic support micropiles suitable for karst sites with local collapse risks according to claim 1, characterized in that: The specific process of data collection and model construction in step 1 is as follows: GCPs were evenly distributed according to the size of the construction site, and routes were planned for the construction site, with a heading overlap of 80% and a lateral overlap of 75%. Drone oblique photography was used to capture all-around footage of the construction site, obtaining accurate photos, POS data, and GCP coordinates. This data was then imported into ContextCapture software for aerial triangulation and precision optimization to construct a 3D model, resulting in DSM and DOM data.

3. The method for constructing photovoltaic support micropiles suitable for karst sites with local collapse risks according to claim 1, characterized in that: The specific process of risk assessment in step 2 is as follows: The obtained three-dimensional model and DSM / DOM data are used to extract the characteristics of slope, curvature and elevation through ArcGIS software. By overlaying geological maps and hydrological data, the comprehensive risk of the construction site is divided into low, medium and high levels, and a risk zoning map is generated.

4. The method for constructing photovoltaic support micropiles suitable for karst sites with local collapse risks according to claim 1, characterized in that: The specific process of installing the anchor pile in step 8 is as follows: First, place the steel cage that makes up the anchor pile in the center of the pile hole, then assemble the galvanized steel pipe that makes up the anchor pile on the top of the steel cage, and then use the positioning device to fix the galvanized steel pipe in the center of the pile hole. The positioning device includes a pile position fixing plate, a clamping mechanism and a driving mechanism. First, place the customized pile position fixing plate at the position of the pile hole. After determining the position of the pile hole, connect the clamping plate on the fixed baffle of the clamping mechanism with the protrusion on the top of the pile position fixing plate, and then fix the fixed baffle to the ground through the fixing nails at the bottom of the slide rails on both sides of the clamping mechanism, and then fix the pile position. After the plate is taken out, the support on the driving mechanism is placed on the ground, the telescopic rod on the driving mechanism is assembled on the support, and then the top rod on the telescopic rod is aligned with the driving port on the clamping mechanism by observing the level bubble on the telescopic rod and the telescopic rod is adjusted to keep it level. The start button of the RF remote control that controls the electric device is pressed, and the flow of liquid in the hydraulic pipe and hydraulic cylinder on the driving mechanism pushes the top rod at the top of the telescopic rod to extend and retract, thereby driving the slide on the clamping mechanism to move forward along the slide rail until the galvanized steel pipe that needs to be embedded on the anchor pile is clamped and fixed.

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