Self-propelled anchor rod double-stand-column photovoltaic support foundation suitable for gravelly soil hole collapse area

Abstract

The invention discloses a self-propelled anchor rod double-stand-column photovoltaic support foundation suitable for a gravelly soil hole collapse area, relates to the technical field of cast-in-place pile foundations, and aims to solve the problems that a traditional miniature cast-in-place pile is difficult in hole forming and serious in hole collapse under the complex geological conditions of gravelly soil or gravel-containing clay and the like. The foundation comprises an upper support concrete abutment and a lower self-propelled anchor rod. The self-propelled anchor rod rotary drill enters a soil layer, cement paste is injected through the built-in grouting channel and the side wall grouting holes, and the cement paste is combined with the surrounding soil body to form a cylindrical pile body to bear the load of the photovoltaic support; the upper support stand column is connected with the anchor rod through the concrete abutment, and structural stability and reliability are ensured. According to the method, disturbance of a traditional hole forming process to a soil body is avoided, the construction process is simplified, the material cost is reduced, the construction efficiency and the bearing capacity are improved, meanwhile, the method has the advantages of being environmentally friendly, economical and practical, is particularly suitable for complex geological conditions in mountain photovoltaic power station construction, and has high popularization value.

Description

Technical Field

[0001] The invention relates to the technical field of cast-in-place pile foundations, and in particular to a self-advanced anchor rod double-column photovoltaic support foundation suitable for gravel soil collapse areas. Background Art

[0002] The construction of photovoltaic power stations has many restrictions on land use due to restrictions in land use policies, especially for mountain photovoltaic power stations, where the current land use conditions are relatively harsh. The land available for photovoltaic power station construction is mostly located in areas with large terrain slopes and complex geological conditions. In the construction of mountain photovoltaic power stations, many projects currently encounter geological conditions such as gravel soil and clay containing gravel. Since the construction areas of photovoltaic power stations are generally dry and rainy, the soil under the above geological conditions is relatively dry and loose.

[0003] Most photovoltaic support foundations currently use micro bored pile foundations. Micro bored pile holes are generally drilled using impact drills. Under the above geological conditions, hole wall collapse, hole diameter expansion, drill clamping, and severe sedimentation often occur during the impact drilling construction process, which has a serious impact on the construction progress of the photovoltaic power station foundation. At the same time, due to problems such as hole diameter expansion, the amount of concrete used in micro bored piles compared to normal drilling increases. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem that micro-cast-in-place piles of photovoltaic brackets cannot be drilled or the holes collapse seriously after drilling under geological conditions of gravel soil or high gravel content. A self-advanced anchor rod double-column photovoltaic bracket foundation suitable for gravel soil collapse areas is proposed, which can avoid the inability to drill holes and the disturbance to the soil during the foundation construction process, and has good economy and practicality.

[0005] The technical solution adopted by the present invention is: A self-advanced anchor rod double-column photovoltaic support foundation suitable for gravel soil collapse hole areas, the self-advanced anchor rod double-column photovoltaic support foundation comprises an upper support column pier and a self-advanced anchor rod; the self-advanced anchor rod is drilled into the soil of the gravel soil collapse hole area to a certain depth, a grouting channel is provided inside the rod body, and a grouting hole for grouting through the grouting channel is provided on the lower rod body; the upper support column comprises a photovoltaic support column and a concrete pier, the photovoltaic support column is fixedly installed on the concrete pier, and the bottom of the photovoltaic support column is connected to the part of the self-advanced anchor rod exposed above the soil of the gravel soil collapse hole area in the concrete pier.

[0006] Furthermore, the self-propelled anchor rod is drilled into the soil of the gravel soil collapse hole area to a certain depth, and after grouting through the grouting channel and the grouting hole, cement slurry penetrates into the soil around the gravel soil collapse hole area to form a pile body with a cylindrical structure.

[0007] Furthermore, the bottom of the photovoltaic support column is plugged or threadedly connected to the part of the self-advancing anchor rod exposed above the soil in the gravel soil collapse hole area.

[0008] Furthermore, the concrete pier is in a cylindrical structure, in which internal steel bars are arranged.

[0009] Furthermore, a drill bit is installed at the bottom of the self-advancing anchor rod.

[0010] Furthermore, a grout stopper, a steel plate gasket and a gasket limiting nut are installed on the self-advancing anchor rod; the grout stopper, the steel plate gasket and the gasket limiting nut are vertically coaxial and located in the concrete pier.

[0011] Furthermore, the construction method of the self-advanced anchor rod double-column photovoltaic support foundation is as follows: Step 1, install the self-propelled anchor rod on the handheld drilling rig; start the handheld drilling rig, and rotate the self-propelled anchor rod into the soil in the area where the gravel soil cannot be drilled until the designed depth is reached; Step 2: connect the grouting pump to the grouting channel of the self-propelled anchor rod, and mix the cement slurry according to the designed proportion; start the grouting pump to allow the cement slurry to be pressurized and diffused into the soil around the gravel soil collapse hole area through the grouting channel and the grouting hole; Step 3: During the grouting process, the cement slurry is prevented from overflowing by using steel plate gaskets and grout stoppers; after the grouting is completed, the cement slurry is waited to solidify to form a stable pile body; Step 4: Connect the photovoltaic support column to the part of the self-propelled anchor rod that is exposed above the soil in the gravel soil collapse hole area, and adjust the position and height of the photovoltaic support column to ensure that its verticality and horizontal position meet the design requirements; Step 5: Tie up the steel cage inside the concrete pier, install the formwork and pour the concrete, and use a vibrator to compact it to ensure that the concrete fills the formwork and is tightly combined with the self-propelled anchor photovoltaic bracket column.

[0012] The beneficial effects of the present invention are: 1. Simplify the construction process and improve construction efficiency: The present invention uses a self-propelled anchor rod to directly drill into the soil layer through a handheld drill, avoiding the complex process of drilling holes first and then placing anchor bars in traditional construction, and achieving the one-time completion of anchor rods and drilling holes. This integrated construction method significantly improves construction efficiency and shortens construction period, and is particularly suitable for foundation construction under complex geological conditions such as gravel soil collapse areas.

[0013] 2. Reduce soil disturbance and protect the ecological environment: The self-propelled anchor rod enters the soil layer by rotary drilling, without pre-drilling or using impact drilling to make holes, which greatly reduces the disturbance of the original soil and avoids soil erosion and surface damage. This feature is especially suitable for scenes with high environmental protection requirements in the construction of mountain photovoltaic power stations, which is in line with the concept of green construction.

[0014] 3. Avoid the problem of being unable to drill holes in gravel soil or soil with high gravel content using conventional construction schemes, and improve construction efficiency: Conventional photovoltaic bracket foundation drilling generally uses spiral drills or impact drills. If the gravel content is too high and the drilling area is dry, the above method cannot drill holes and conventional concrete pouring construction cannot be carried out. The present invention can avoid the work of drilling holes during construction, and directly use self-propelled anchor rods to drill into the soil to form a stable and reliable bracket foundation form.

[0015] 4. Optimize material utilization and reduce construction costs: Traditional cast-in-place piles will increase the amount of concrete when the hole collapses or the hole diameter expands. However, the pile body formed by grouting in the present invention allows the cement slurry to fully combine with the surrounding soil, effectively controlling the amount of materials and reducing construction costs. At the same time, the self-propelled anchor integrates the functions of drilling and grouting, reducing equipment and manpower investment, and further improving economic efficiency.

[0016] 5. Enhanced bearing capacity and ensured structural stability: The cylindrical pile formed after grouting is closely integrated with the surrounding soil, has high compressive and tensile bearing capacity, and can effectively bear the vertical and horizontal loads transmitted by the photovoltaic bracket. In addition, the concrete pier firmly connects the upper bracket column with the self-propelled anchor rod, which enhances the stability and reliability of the overall structure and meets the safety requirements of the long-term use of the photovoltaic bracket.

[0017] 6. Improve connection reliability and extend service life: The bottom of the photovoltaic support column is connected to the part of the self-propelled anchor rod exposed above the soil in the gravel soil collapse area in the concrete pier, which increases the reliability of the connection. The steel plate gasket and grout stopper are buried in the pier when pouring concrete, which further enhances the connection strength between the self-propelled anchor rod and the concrete pier, ensuring that the foundation structure remains stable under long-term load.

[0018] To sum up, the present invention solves the foundation construction problem in the gravel soil collapse area through the combination of self-advanced anchor rods and grouting technology. It has the advantages of convenient construction, good economy, strong bearing capacity, and environmental protection and reliability. It provides an innovative and practical technical solution for the foundation construction of photovoltaic brackets under complex geological conditions, and has broad prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the self-advanced anchor rod double-column photovoltaic support foundation of the present invention; Figure 2 It is a schematic diagram of the disassembly of the foundation of the self-advanced anchor rod double-column photovoltaic support of the present invention; Figure 3 It is a schematic diagram of the disassembly of the self-advancing anchor rod of the present invention; In the figure, 1 is a self-advanced anchor rod, 2 is a grouting channel, 3 is a grouting hole, 4 is a photovoltaic support column, 5 is a concrete pier, 6 is a pile body, 7 is an internal steel bar, 8 is a drill bit, 9 is a grouting plug, 10 is a steel plate gasket, and 11 is a gasket limit nut. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In order to solve the problem that micro bored piles of photovoltaic brackets cannot be drilled or the holes collapse seriously after drilling under geological conditions of gravel soil or high gravel content, this embodiment provides a self-advanced anchor rod double-column photovoltaic bracket foundation suitable for gravel soil collapse areas.

[0023] like Figure 1 and Figure 2 As shown, the self-propelled anchor rod double column photovoltaic support foundation includes an upper support column pier and a self-propelled anchor rod. Figure 1 As shown, the self-propelled anchor rod 1 can be drilled into the soil of the gravel soil collapse area to a certain depth by a handheld drill; Figure 3 As shown, a grouting channel 2 is provided inside the rod body of the self-advancing anchor rod 1, and a grouting hole 3 for grouting the grouting channel 2 is provided on the lower rod body of the self-advancing anchor rod 1. The number and position of the grouting holes 3 are set according to actual needs; Figure 1 and Figure 2 As shown, the self-propelled anchor rod 1 is drilled into the soil of the gravel soil collapse hole area to a certain depth. After grouting through the grouting channel 2 and the grouting hole 3, the cement slurry is immersed in the soil around the gravel soil collapse hole area to form a cylindrical pile body 6. The self-propelled anchor rod 1 drills into the soil layer and forms a pile foundation. Through grouting, it combines with the surrounding soil to form a high-bearing-capacity pile body 6 to bear the load transmitted by the upper bracket. The pile body 6 bears the vertical load and horizontal load transmitted by the photovoltaic bracket, has a high compressive and tensile bearing capacity, and avoids disturbance of the original soil.

[0024] like Figure 1 and Figure 2As shown, the upper support column in this embodiment includes a photovoltaic support column 4 and a concrete pier 5; the photovoltaic support column 4 is fixedly installed on the concrete pier 5, and the bottom of the photovoltaic support column 4 is connected to the self-propelled anchor rod 1 exposed above the soil body in the gravel soil collapse hole area in the concrete pier 5, and the connection method can be plug-in or threaded connection. Among them, the upper support column is used to support the photovoltaic module and transfer the load of the photovoltaic module to the concrete pier 5; the concrete pier 5 is a cylindrical structure, and internal steel bars 7 are arranged inside it to provide reliable fixing and force transmission functions, so that the force load of the photovoltaic support column 4 can be effectively transferred to the pile body 6.

[0025] Further, as a preferred technical solution of this embodiment, Figure 2 and Figure 3 As shown, a drill bit 8 is installed at the bottom of the self-advancing anchor rod 1 in this embodiment, so that the self-advancing anchor rod 1 can be quickly drilled into the soil in the gravel soil collapse area through a handheld drill. In addition, a grouting plug 9, a steel plate gasket 10 and a gasket limiting nut 11 are installed on the self-advancing anchor rod 1; the grouting plug 9, the steel plate gasket 10 and the gasket limiting nut 11 are vertically coaxial and located in the concrete pier 5; wherein, the grouting plug 9 is used to prevent the cement slurry from overflowing during the grouting process, and the steel plate gasket 10 can further prevent the cement slurry from overflowing during the grouting process, and increase the connection strength between the anchor rod and the concrete pier 5. The gasket limiting nut 11 is used to limit the position of the steel plate gasket 10.

[0026] Based on the above self-propelled anchor double-column photovoltaic support foundation, a geological survey is required before construction. A detailed geological survey of the construction area is required to clarify the thickness, distribution range and soil properties of the gravel soil layer, such as looseness, water content, etc. According to geological conditions and engineering requirements, the drilling depth, grouting pressure and cement slurry ratio of the self-propelled anchor 1 are determined.

[0027] The specific construction steps are as follows: Step 1, install the self-propelled anchor rod 1 on the handheld drilling rig; start the handheld drilling rig, and rotate the self-propelled anchor rod 1 into the soil in the gravel soil area where the hole cannot be drilled until the designed depth is reached. The depth of the self-propelled anchor rod 1 drilled into the soil in the gravel soil collapse area is determined according to geological conditions and engineering requirements; pay attention to controlling the drilling speed and drilling pressure during drilling to avoid anchor rod deflection or damage due to improper operation; observe the soil layer during drilling, and if encountering large resistance or abnormal conditions, adjust the drilling rig parameters or replace the drill bit 8 in time.

[0028] Step 2: Connect the grouting pump to the grouting channel 2 of the self-propelled anchor 1, and mix the cement slurry according to the designed proportion; start the grouting pump, and the cement slurry will be pressurized and diffused into the soil around the gravel soil collapse hole area through the grouting channel 2 and the grouting hole 3. The grouting pressure should be adjusted according to the soil layer characteristics and design requirements to avoid soil disturbance caused by excessive pressure or insufficient slurry diffusion caused by too low pressure; the grouting volume and pressure changes should be continuously observed during the grouting process to ensure that the slurry fully fills the soil voids.

[0029] Step 3: During the grouting process, the steel plate gasket 10 and the grout stopper 9 are used to prevent the cement slurry from overflowing; after the grouting is completed, wait for 24 to 48 hours for the cement slurry to solidify to form a stable pile body 6.

[0030] Step 4: Connect the photovoltaic support column 4 with the part of the self-propelled anchor 1 that is reserved and exposed above the soil in the gravel soil collapse area, and adjust the position and height of the photovoltaic support column 4 to ensure that its verticality and horizontal position meet the design requirements. The depth of the upper support column inserted into the concrete pier 5 should meet the design requirements to ensure a firm connection; at the same time, the connection length of the photovoltaic support column 4 and the self-propelled anchor 1 must meet the design specifications to enhance the reliability of the connection.

[0031] Step 5, tie the steel cage inside the concrete pier 5, install the formwork and pour the concrete, use a vibrator to vibrate and compact the concrete, ensure that the concrete fills the formwork and is tightly combined with the self-propelled anchor rod 1 and the photovoltaic support column 4. During the pouring process, excessive vibration should be avoided to prevent the self-propelled anchor rod 1 or the upper support column from displacement; during the curing period, the concrete should be kept moist to avoid cracking due to water loss; after the concrete pier 5 is poured, the grout stopper 9, the steel plate gasket 10 and the gasket limit nut 11 are all located in the concrete pier 5, which further enhances the connection strength between the self-propelled anchor rod 1 and the concrete pier 5, ensuring that the foundation structure remains stable under long-term load.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Self-propelled anchor double-column photovoltaic support foundation suitable for gravel soil collapse area, characterized by: The self-advanced anchor rod double-column photovoltaic support foundation includes an upper support column pier and a self-advanced anchor rod; the self-advanced anchor rod is drilled into the soil of the gravel soil collapse hole area to a certain depth, and a grouting channel is provided inside the rod body, and a grouting hole is provided on the lower rod body for grouting out of the grouting channel; the upper support column includes a photovoltaic support column and a concrete pier, the photovoltaic support column is fixedly installed on the concrete pier, and the bottom of the photovoltaic support column is connected to the part of the self-advanced anchor rod exposed above the soil of the gravel soil collapse hole area in the concrete pier.

2. The self-advanced anchor rod double-column photovoltaic support foundation suitable for gravel soil collapse area according to claim 1 is characterized by: The self-propelled anchor rod is drilled into the soil of the gravel soil collapse hole area to a certain depth, and after grouting through the grouting channel and the grouting hole, cement slurry is immersed in the soil around the gravel soil collapse hole area to form a pile body with a cylindrical structure.

3. The self-advanced anchor rod double-column photovoltaic support foundation suitable for gravel soil collapse area according to claim 1, characterized in that: The bottom of the photovoltaic support column is plugged or threadedly connected to the part of the self-advancing anchor rod exposed above the soil in the gravel soil collapse hole area.

4. The self-advanced anchor rod double-column photovoltaic support foundation suitable for gravel soil collapse area according to claim 1, characterized in that: The concrete pier is in a cylindrical structure, in which internal steel bars are arranged.

5. The self-advanced anchor rod double-column photovoltaic support foundation suitable for gravel soil collapse area according to claim 1, characterized in that: A drill bit is installed at the bottom of the self-advancing anchor rod.

6. The self-advanced anchor rod double-column photovoltaic support foundation suitable for gravel soil collapse area according to claim 1, characterized in that: The self-advancing anchor rod is provided with a grout stopper, a steel plate gasket and a gasket limiting nut; the grout stopper, the steel plate gasket and the gasket limiting nut are vertically coaxial and are located in the concrete pier.

7. The self-propelled anchor rod double-column photovoltaic support foundation suitable for gravel soil collapse area according to claim 1, characterized in that: The construction method of the self-propelled anchor double-column photovoltaic support foundation is as follows: Step 1, install the self-propelled anchor rod on the handheld drilling rig; start the handheld drilling rig, and rotate the self-propelled anchor rod into the soil in the area where the gravel soil cannot be drilled until the designed depth is reached; Step 2, connecting the grouting pump to the grouting channel of the self-propelled anchor, and mixing the cement slurry according to the designed proportion; Start the grouting pump to spread the pressurized cement slurry through the grouting channel and grouting holes into the soil around the gravel soil collapse hole area; Step 3: During the grouting process, the cement slurry is prevented from overflowing by using steel plate gaskets and grout stoppers; after the grouting is completed, the cement slurry is waited to solidify to form a stable pile body; Step 4: Connect the photovoltaic support column to the part of the self-propelled anchor rod that is exposed above the soil in the gravel soil collapse hole area, and adjust the position and height of the photovoltaic support column to ensure that its verticality and horizontal position meet the design requirements; Step 5: Tie the steel cage inside the concrete pier, install the formwork and pour the concrete, and use a vibrator to compact it to ensure that the concrete fills the formwork and is tightly combined with the self-propelled anchor photovoltaic bracket column.

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