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

Abstract

The utility model 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 stand column 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 utility model, the disturbance of a traditional pore-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, and meanwhile, the device has the characteristics of environmental protection, economy and practicability, is particularly suitable for complex geological conditions in the construction of a mountain photovoltaic power station, and has higher popularization value.

Description

Technical Field

[0001] This utility model relates to the field of cast-in-place pile foundation technology, and in particular to a self-propelled anchor double-column photovoltaic support foundation suitable for areas with collapsed gravel soil. Background Technology

[0002] Due to land use policy restrictions, the construction of photovoltaic power stations faces numerous limitations, especially for mountainous photovoltaic power stations, where land conditions are currently quite stringent. Land suitable for photovoltaic power station construction is mostly located in areas with steep slopes and complex geological conditions. During the construction of mountainous photovoltaic power stations, many projects currently encounter geological conditions such as gravelly soil and clay containing gravel. Because the areas where photovoltaic power stations are built are generally dry and receive little rainfall, the soil under these geological conditions is relatively dry and loose.

[0003] Currently, most photovoltaic support foundations use micro-grown pile foundations. Micro-grown piles are typically drilled using impact drills. Under the aforementioned geological conditions, impact drilling often results in issues such as borehole wall collapse, enlarged borehole diameter, drill bit jamming, and severe sediment buildup, which seriously affect the construction progress of photovoltaic power station foundations. In addition, due to issues such as enlarged borehole diameter, the amount of concrete used is increased compared to micro-grown piles with normal boreholes. Utility Model Content

[0004] The purpose of this invention is to overcome the problem that micro-grouted piles for photovoltaic supports cannot be drilled or that the drilled holes collapse severely in gravelly soil or geological conditions with high gravel content. It proposes a self-advancing anchor double-column photovoltaic support foundation suitable for gravelly soil areas with collapsed holes. This foundation can avoid the inability to drill holes and the disturbance to the soil during foundation construction, and has good economic efficiency and practicality.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A self-drilling anchor double-column photovoltaic support foundation suitable for areas with collapsed gravel and soil is provided. This foundation includes an upper support column pier and self-drilling anchors. The self-drilling anchors are drilled into the soil at a certain depth in the collapsed gravel and soil area. The anchors have grouting channels inside their shafts and grouting holes on their lower shafts to facilitate grout discharge. 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 within the concrete pier to the portion of the self-drilling anchor protruding above the collapsed gravel and soil area.

[0007] Furthermore, the self-drilling anchor rod is drilled into the soil of the collapsed gravel hole area to a certain depth. After grouting is carried out through the grouting channel and grouting hole, the cement grout is immersed in the soil around the collapsed gravel hole area to form a pile with a cylindrical structure.

[0008] Furthermore, the bottom of the photovoltaic support column is inserted or threadedly connected to the portion of the self-advancing anchor rod exposed above the soil in the collapsed area of ​​the gravel soil.

[0009] Furthermore, the concrete pier has a cylindrical structure with internal steel reinforcement.

[0010] Furthermore, a drill bit is installed at the bottom of the self-advancing anchor bolt.

[0011] Furthermore, the self-advancing anchor bolt is equipped with a grout stop plug, a steel plate gasket, and a gasket limiting nut; the grout stop plug, the steel plate gasket, and the gasket limiting nut are vertically coaxial and located inside the concrete pier.

[0012] Furthermore, the construction method for this self-propelled anchor bolt double-column photovoltaic support foundation is as follows:

[0013] Step 1: Install the self-drilling anchor on the handheld drill; start the handheld drill and drill the self-drilling anchor into the soil in the collapsed area of ​​the gravel soil until the designed depth is reached;

[0014] Step 2: Connect the grouting pump to the grouting channel of the self-propelled anchor bolt, and mix the cement grout according to the design ratio; after starting the grouting pump, the cement grout is pressurized and diffused into the soil around the collapsed gravel and soil hole area through the grouting channel and grouting hole.

[0015] Step 3: During the grouting process, steel plate gaskets and grout stop plugs are used to prevent cement grout from overflowing; after grouting is completed, wait for the cement grout to solidify and form a stable pile.

[0016] Step 4: Connect the photovoltaic support column to the part of the self-advancing anchor rod that is exposed above the soil in the collapsed area of ​​the gravel soil, and adjust the position of the photovoltaic support column to ensure that its verticality and horizontal position meet the design requirements.

[0017] Step 5: Tie the steel reinforcement cage inside the concrete pier, install the formwork and pour the concrete. Use a vibrator to compact the concrete, ensuring that the concrete fills the formwork and is tightly bonded to the self-propelled anchor photovoltaic support column.

[0018] The beneficial effects of this utility model are:

[0019] 1. Simplified construction process and improved construction efficiency: This utility model adopts a self-drilling anchor bolt that is directly drilled into the soil layer using a handheld drilling machine, avoiding the complicated process of drilling holes and then inserting anchor bars in traditional construction, and realizing the one-time completion of anchor bolt and drilling. This integrated construction method significantly improves construction efficiency and shortens the construction period, and is particularly suitable for foundation construction under complex geological conditions such as gravelly soil collapse areas.

[0020] 2. Reduced soil disturbance and protection of the ecological environment: Self-drilling anchors enter the soil layer through rotary drilling, eliminating the need for pre-drilling or the use of impact drills. This significantly reduces disturbance to the original soil, preventing soil erosion and surface damage. This feature is particularly suitable for mountainous photovoltaic power station construction scenarios with high environmental protection requirements, aligning with the concept of green construction.

[0021] 3. This invention avoids the problem of drilling holes in gravelly soil or soil with a high gravel content using conventional construction methods, thus improving construction efficiency: Conventional photovoltaic support foundation drilling typically uses auger drills or impact drills. However, if the gravel content is too high or the drawing of the drilling area is dry, these methods are unusable, making conventional concrete pouring impossible. This invention eliminates the need for drilling during construction, directly using self-drilling anchor bolts to form a stable and reliable support foundation.

[0022] 4. Optimized material utilization and reduced construction costs: Traditional cast-in-place piles lead to increased concrete consumption when the borehole collapses or the borehole diameter enlarges. However, this utility model, through grouting, allows the cement grout to fully integrate with the surrounding soil, effectively controlling material consumption and reducing construction costs. Furthermore, the self-drilling anchor integrates drilling and grouting functions, reducing equipment and manpower input and further improving economic efficiency.

[0023] 5. Enhanced load-bearing capacity and ensured structural stability: The cylindrical piles formed after grouting are tightly bonded to the surrounding soil, possessing high compressive and tensile bearing capacity, effectively bearing the vertical and horizontal loads transmitted by the photovoltaic support. Furthermore, the concrete piers firmly connect the upper support columns to self-advancing anchors, enhancing the overall structural stability and reliability, and meeting the safety requirements for long-term use of the photovoltaic support.

[0024] 5. Improve connection reliability and extend service life:

[0025] The base of the photovoltaic support column is connected within the concrete pier to the portion of the self-drilling anchor bolt exposed above the soil in the collapsed area of ​​the gravel soil, increasing the reliability of the connection. Steel plate gaskets and grout plugs are embedded in the pier during concrete pouring, further enhancing the connection strength between the self-drilling anchor bolt and the concrete pier, ensuring the stability of the foundation structure under long-term loads.

[0026] In summary, this utility model solves the foundation construction problem in the collapsed area of ​​gravelly soil by combining self-advancing anchor bolts with grouting technology. It has the advantages of convenient construction, good economy, strong bearing capacity, and environmental reliability. It provides an innovative and practical technical solution for the construction of photovoltaic support foundations under complex geological conditions and has broad application prospects. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the self-advancing anchor double-column photovoltaic support foundation of this utility model;

[0029] Figure 2 This is a split diagram of the self-advancing anchor bolt double-column photovoltaic support foundation of this utility model;

[0030] Figure 3 This is a schematic diagram showing the disassembled self-advancing anchor bolt of this utility model;

[0031] In the diagram, 1—self-propelled anchor bolt, 2—grouting channel, 3—grouting hole, 4—photovoltaic support column, 5—concrete pier, 6—pile body, 7—internal reinforcement, 8—drill bit, 9—grout stop plug, 10—steel plate gasket, 11—gasket limit nut. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0033] To address the problem that micro-grouted piles for photovoltaic supports cannot be drilled or suffer severe hole collapse after drilling in geological conditions such as gravelly soil or soil with high gravel content, this embodiment provides a self-advancing anchor double-column photovoltaic support foundation suitable for areas with collapsed holes in gravelly soil.

[0034] like Figure 1 and Figure 2 As shown, the self-advancing anchor bolt double-column photovoltaic support foundation includes an upper support column pier and self-advancing anchor bolts. Among them, as... Figure 1 As shown, the self-drilling anchor bolt 1 can be drilled to a certain depth into the soil in the collapsed area of ​​the gravel soil using a handheld drilling rig; as Figure 3 As shown, the self-drilling anchor bolt 1 has a grouting channel 2 inside its rod body, and grouting holes 3 on the lower part of the rod body that cooperate with the grouting channel 2 for grout discharge. The number and position of the grouting holes 3 are set according to actual needs; for example... Figure 1 and Figure 2As shown, the self-drilling anchor 1 is drilled into the soil of the collapsed gravel-soil area to a certain depth. After grouting is performed through the grouting channel 2 and the grouting hole 3, the cement grout seeps into the soil surrounding the collapsed gravel-soil area, forming a cylindrical pile 6. The self-drilling anchor 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 6, which is used to bear the load transmitted by the upper support. The pile 6 bears the vertical and horizontal loads transmitted by the photovoltaic support, has high compressive and tensile bearing capacity, and avoids disturbance to the original soil.

[0035] like Figure 1 and Figure 2 As 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 part of the self-drilling anchor 1 exposed above the soil in the collapsed area of ​​the gravel soil within the concrete pier 5. The connection method can be plug-in or threaded connection. 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 has a cylindrical structure with internal steel bars 7 to provide reliable fixing and force transmission functions, so that the load of the photovoltaic support column 4 can be effectively transferred to the pile body 6.

[0036] Furthermore, as a preferred technical solution in this embodiment, such as Figure 2 and Figure 3 As shown, in this embodiment, a drill bit 8 is installed at the bottom of the self-drilling anchor 1, allowing the self-drilling anchor 1 to quickly drill into the soil in the collapsed area of ​​the gravel soil using a handheld drilling rig. Furthermore, the self-drilling anchor 1 is equipped with a grout stop plug 9, a steel plate gasket 10, and a gasket limiting nut 11; the grout stop plug 9, steel plate gasket 10, and gasket limiting nut 11 are vertically coaxial and located within the concrete pier 5; the grout stop plug 9 is used to prevent cement grout from overflowing during grouting, and the steel plate gasket 10 further prevents cement grout from overflowing during grouting and increases the connection strength between the anchor and the concrete pier 5. The gasket limiting nut 11 is used to limit the position of the steel plate gasket 10.

[0037] Based on the aforementioned self-drilling anchor bolt double-column photovoltaic support foundation, a geological survey is required before construction. A detailed geological survey of the construction area is necessary to determine the thickness, distribution range, and soil characteristics of the gravelly soil layer, such as its looseness and moisture content. Based on the geological conditions and engineering requirements, the drilling depth, grouting pressure, and cement grout mix ratio of the self-drilling anchor bolt 1 are determined.

[0038] The specific construction steps are as follows:

[0039] Step 1: Install the self-drilling anchor bolt 1 onto the handheld drill rig; start the handheld drill rig and rotary drill the self-drilling anchor bolt 1 into the soil of the collapsed gravel-soil hole area until the designed depth is reached. The drilling depth of the self-drilling anchor bolt 1 into the soil of the collapsed gravel-soil hole area is determined according to geological conditions and engineering requirements; during drilling, pay attention to controlling the drilling speed and drilling pressure to avoid anchor bolt deviation or damage due to improper operation; observe the soil layer conditions during drilling, and if significant resistance or abnormal conditions are encountered, adjust the drilling rig parameters or replace the drill bit 8 in a timely manner.

[0040] Step 2: Connect the grouting pump to the grouting channel 2 of the self-propelled anchor 1, and mix the cement grout according to the design ratio. After starting the grouting pump, the cement grout, under pressure, diffuses into the soil surrounding the collapsed area of ​​the gravel-soil hole through the grouting channel 2 and the grouting hole 3. The grouting pressure should be adjusted according to the soil characteristics and design requirements to avoid excessive pressure causing soil disturbance or insufficient grout diffusion due to insufficient pressure. During the grouting process, the grouting volume and pressure changes should be continuously observed to ensure that the grout fully fills the soil voids.

[0041] Step 3: During the grouting process, steel plate gaskets 10 and grout stopper 9 are used to prevent cement grout from overflowing; after grouting is completed, wait 24 to 48 hours for the cement grout to solidify and form a stable pile body 6.

[0042] Step 4: Connect the photovoltaic support column 4 to the portion of the self-drilling anchor rod 1 that is exposed above the soil in the collapsed area of ​​the gravel and soil. Adjust the position of the photovoltaic support column 4 to ensure that its verticality and horizontal position meet the design requirements. The depth to which the upper support column is inserted into the concrete pier 5 should meet the design requirements to ensure a firm connection. At the same time, the connection length between the photovoltaic support column 4 and the self-drilling anchor rod 1 must meet the design specifications to enhance the reliability of the connection.

[0043] Step 5: Tie the reinforcing cage inside the concrete pier 5, install the formwork, and pour concrete. Use a vibrator to compact the concrete, ensuring it fills the formwork and is tightly bonded to the self-drilling anchor 1 and the photovoltaic support column 4. During pouring, avoid excessive vibration to prevent displacement of the self-drilling anchor 1 or the upper support column. Keep the concrete moist during curing to prevent cracking due to water loss. After the concrete pier 5 is poured, the grout stopper 9, steel plate gasket 10, and gasket limiting nut 11 are all located inside the concrete pier 5, further enhancing the connection strength between the self-drilling anchor 1 and the concrete pier 5, ensuring the stability of the foundation structure under long-term loads.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A self-advancing anchor rod double-column photovoltaic support foundation suitable for the collapsed hole area of a gravel soil, characterized in that: The self-advancing anchor rod double-column photovoltaic support foundation comprises an upper support column pier and a self-advancing anchor rod; the self-advancing anchor rod is drilled into the soil in a broken stone hole area to a certain depth, an internal grouting channel is arranged in the rod body of the self-advancing anchor rod, and a grouting hole for matching the grouting channel is arranged 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 with the part of the self-advancing anchor rod exposed above the soil in the broken stone hole area in the concrete pier.

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

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

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

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

6. The self-advancing anchor rod double column photovoltaic support foundation suitable for the collapsed hole area of the gravel soil according to claim 1, characterized in that: A grouting stopper, a steel plate gasket and a gasket limiting nut are installed on the self-advancing anchor rod; the grouting stopper, the steel plate gasket and the gasket limiting nut are vertically coaxial and located in the concrete pier.

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