Miniature pile foundation for mountain photovoltaic support

Abstract

The utility model discloses a miniature pile foundation for a mountain photovoltaic support, relates to the technical field of pile foundations, and aims to solve the problem that an existing pile foundation is difficult to meet the stability requirement of the mountain photovoltaic support, a pile body is connected with a pile cap, the pile cap is connected with an anchoring part obliquely extending into a stratum, and the anchoring part is used for obliquely pulling to assist the pile body to be stable. And the local spiral pieces are arranged on the pile bodies, the pile bodies are correspondingly arranged in the shallow stratum, the embedding difficulty is reduced, the pulling resistance is improved, and the mountain engineering requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundations, in particular to a micro pile foundation for a mountain photovoltaic support. Background Art

[0002] In mountain projects, micro-cast piles or steel screw piles are often used as the foundation of photovoltaic brackets. The construction process of micro-cast pile foundations is relatively complicated. The upper bracket structure can only be constructed after the strength of the holes is reached from the drilling to the pouring of concrete. The steel screw pile foundation has constraints such as difficulty in screwing into the soil due to the fact that the screw is near the pile head and there are many broken stones in mountainous sites. The short depth of the pile foundation into the soil may lead to failure to meet the requirements of pull-out resistance and anti-overturning, so it is rarely used.

[0003] A Chinese patent (publication number: CN203498860U) discloses a photovoltaic module support with concrete block anchor foundation structure, which combines concrete blocks with steel anchors, and uses concrete blocks to increase the pull-out resistance and horizontal load resistance of steel anchors, thereby enhancing the stability of photovoltaic supports. It is suitable for supporting photovoltaic module supports in flat areas. For mountain projects, due to the existence of the mountain slope, after the steel anchor is placed in the stratum, there is a deviation in the stratum support effect on both sides, resulting in insufficient anti-overturning ability of the steel anchor as a photovoltaic support; in addition, after the steel anchor is removed from the spiral, although the difficulty of placement is reduced, its pull-out resistance also decreases, resulting in its pull-out resistance being difficult to meet the requirements when it is applied to photovoltaic projects in mountains. Utility Model Content

[0004] The purpose of the utility model is to provide a micro pile foundation for mountain photovoltaic brackets in response to the defects of the prior art. The pile cap is connected to the pile body, and the pile cap is connected with an anchor piece that extends obliquely into the stratum. The anchor piece is used to assist the pile body to improve the anti-overturning ability of the entire micro pile foundation. Local spiral sheets are arranged on the pile body, which are placed in shallow strata to reduce the difficulty of placement and improve the pull-out resistance to meet the needs of mountain engineering.

[0005] In order to achieve the above purpose, the following technical solutions are adopted:

[0006] A micro pile foundation for a mountain photovoltaic support, comprising:

[0007] The pile cap is a prism-shaped shell structure with a cavity formed inside. The bottom surface of the pile cap is provided with a through hole, the top surface is provided with a mounting hole, and the cavity is filled with concrete;

[0008] The pile body has one end inserted into the cavity through the through hole to form a butt end, and the other end extends outside the cavity. The pile body is fixedly connected to the pile cap, and an installation channel for the photovoltaic bracket to pass through is formed between the installation hole and the butt end. A spiral piece is provided on the end of the pile body located outside the cavity and close to the pile cap;

[0009] The anchor is distributed obliquely relative to the axis of the pile body. The anchoring section of the anchor is located outside the pile cap. The fixed section of the anchor passes through the side wall of the pile cap and extends into the cavity, and is fixed to the pile cap through an anchor connector to form an oblique pull.

[0010] Furthermore, the segment of the pile body located in the cavity is provided with an external thread, the external thread is matched with a clamping nut, and the clamping nut abuts against the inner wall of the cavity.

[0011] Furthermore, the butt end is a plug hole, and the via hole, the plug hole and the mounting hole are coaxially distributed.

[0012] Furthermore, the pile body is a steel pipe, and a conical pile tip is provided at one end of the pile body extending outside the cavity.

[0013] Furthermore, a groove is provided on the segment of the pile body outside the cavity, and the groove is located on the side wall of the pile body and penetrates the side wall of the pile body.

[0014] Furthermore, the pile cap is a regular tetrahedral structure, the top surface of the pile cap is a square top plate, the bottom surface of the pile cap is a square bottom plate, the through hole is located at the center of the bottom surface of the pile cap, and the installation hole is located at the center of the top surface of the pile cap.

[0015] Furthermore, the side length of the top plate is greater than the side length of the bottom plate, and the anchor connector is fixed on the side plate of the pile cap between the top plate and the bottom plate.

[0016] Furthermore, the top plate is provided with separate grouting holes and exhaust holes, and the grouting holes are used for connecting to external grouting pipes.

[0017] Furthermore, the top end of the spiral sheet abuts against the bottom surface of the bottom plate.

[0018] Furthermore, a plurality of ribs are provided on the top plate of the pile cap, and the ribs are distributed at intervals along the mounting hole in an annular direction, and are used to connect to a photovoltaic bracket that matches the mounting channel.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] In response to the problem that current pile foundations are difficult to meet the stability requirements of mountain photovoltaic brackets, the utility model adopts a pile body to connect the pile cap, and the pile cap is connected with an anchor that extends obliquely into the stratum. The anchor is used to assist the pile body in stabilizing the inclined pull, thereby improving the anti-overturning ability of the entire micro pile foundation. Local spiral blades are arranged on the pile body, which are placed in shallow strata to reduce the difficulty of placement and improve the pull-out resistance, thereby meeting the needs of mountain engineering.

[0021] In the utility model, a prism-shaped pile cap is provided, and after the pile cap is filled with concrete, it serves as a base structure, establishes a coordinated force-bearing structure among the photovoltaic support, the pile body and the anchor, and improves the overall stability.

[0022] In the utility model, through the synergistic effect of the pile cap, pile body and anchor, the micro pile foundation can provide stable foundation support in mountainous environments to resist the overturning and pulling out of the photovoltaic bracket. The spiral blade design on the pile body makes it easier for the pile body to be screwed into the stratum, reducing the construction difficulty and cost. It is suitable for mountainous environments with complex geological conditions and shallow soil layers, and has strong adaptability and scalability.

[0023] In the utility model, the cooperation between the external thread and the clamping nut can ensure a stable connection between the pile body and the pile cap, and the bottom plate of the pile cap is located between the spiral sheet and the clamping nut, thereby avoiding loosening or displacement and improving the stability of the entire micro pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a micro pile foundation for a mountain photovoltaic support in an embodiment of the utility model.

[0025] Figure 2 It is a schematic diagram of a pile cap in an embodiment of the utility model.

[0026] Figure 3 It is a schematic diagram of the cross section of the pile body in the embodiment of the utility model.

[0027] Figure 4 It is a schematic diagram of another cross section of the pile body in the embodiment of the utility model.

[0028] Explanation of the numbers (in order of first appearance): 1. Photovoltaic support, 2. Rib, 3. Pile cap, 4. Compression nut, 5. Spiral sheet, 6. Pile body, 7. Pile tip, 8. Anchor connector, 9. Anchor, 10. Through hole, 11. Grouting hole, 12. Exhaust hole. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0030] The mountain photovoltaic bracket 1 requires a stable foundation to resist overturning and pulling out, especially in mountain environments with complex geological conditions and shallow soil layers. In this regard, the present embodiment provides a micro-pile foundation for a mountain photovoltaic bracket, which utilizes the coordinated force of the pile body 6, the pile cap 3 and the anchor 9 to form a stable micro-pile foundation. An installation channel for installing the photovoltaic bracket 1 is formed in the pile cap 3, and the spiral blade 5 arranged on the pile body 6 can ensure the pull-out resistance and jointly maintain the stability of the entire micro-pile contact.

[0031] like Figure 1 As shown, the micro pile foundation for mountain photovoltaic support mainly includes a pile cap 3, a pile body 6 and an anchor 9.

[0032] The pile cap 3 adopts a prism-shaped shell structure with a cavity formed inside. After the cavity is filled with concrete, a stable pier joint can be formed. The pile cap 3 is arranged on the surface of the area and can provide stable support. At the same time, a through hole 10 is provided on the bottom surface of the pile cap 3 and an installation hole is provided on the top surface. The through hole 10 and the installation hole are used to assist the installation of the pile body 6 and the photovoltaic bracket 1.

[0033] One end of the pile body 6 is butted against the pile cap 3, and the other end extends into the stratum. As the pile body 6 extends downward in the stratum, the stability of the foundation is enhanced. The spiral blades 5 arranged on the pile body 6 are distributed on one end of the part of the pile body 6 outside the cavity close to the pile cap 3. Compared with the spiral blades 5 arranged along the axial length of the pile body 6, the shorter distribution position can be more easily screwed into the stratum, while improving the pull-out resistance.

[0034] It should be pointed out that the pile body 6 is constructed first, and the pile hole diameter is slightly smaller than the pipe diameter of the pile body 6 through driving construction. The pile body 6 has a pile diameter of 150mm to 300mm. After driving, a soil squeezing effect is formed, which increases the friction force of the side wall of the pile body 6 and increases the compressive and tensile bearing capacity of the entire micropile foundation.

[0035] When the pile body 6 is driven into the position of the spiral piece 5, a rotary pressing method is adopted for construction, so that the spiral piece 5 segment can be pressed into a shallower position, thereby assisting in improving the pull-out resistance of the pile body 6 itself.

[0036] The pile body 6 is fixedly connected to the pile cap 3, and an installation channel is formed between the installation hole and the docking end for the photovoltaic bracket 1 to pass through. During installation, the photovoltaic bracket 1 passes through the installation hole into the installation channel and is fixedly connected to the docking section to establish a stable connection between the photovoltaic bracket and the pile body 6, the pile cap 3 and the concrete inside the pile cap 3.

[0037] The anchor 9 is distributed obliquely relative to the axis of the pile body 6. The anchor 9 can be made of anchor rods, anchor cables, etc., and drilled in an inclined manner. Then, the anchoring section of the anchor 9 such as the anchor rod and anchor cable is deeply inserted into the drilled hole formed in the stratum, and then the drilled hole is grouted and anchored, so that the anchoring section of the anchor 9 is tightly anchored to the stratum. The fixed section of the anchor 9 is fixed to the pile cap 3 through the anchor connector 8 to form a diagonal structure, which effectively improves the anti-overturning ability of the entire micro pile foundation.

[0038] It is understandable that when constructing the anchor 9, the top of the pile cap 3 can be opened first, a through hole can be opened on the side wall of the pile cap 3, and then a drill hole can be formed. After the construction of the anchor 9 is completed, the anchor connector 8 can be installed. Before grouting the pile cap 3, the top of the pile cap 3 can be re-sealed and grouting can be performed.

[0039] The prism-shaped shell structure allows the pile cap 3 to have a certain degree of stability while maintaining strength. The concrete filled inside increases the load-bearing capacity and impact resistance of the pile cap 3. The fixed connection method between the pile body 6 and the pile cap 3 ensures the integrity of the structure. The spiral blade 5 on the pile body 6 makes it easier for the pile body 6 to penetrate the soil when it is screwed into the formation, while increasing the friction with the formation and enhancing the pull-out resistance. It is suitable for mountainous environments with complex geological conditions and shallow soil layers, and has the advantages of stable structure, simple construction and strong adaptability.

[0040] like Figure 1 As shown, in order to ensure a stable connection between the pile body 6 and the pile cap 3, an external thread is provided on the segment of the pile body 6 located in the cavity, and is used in conjunction with the clamping nut 4. A spiral piece 5 is provided on the end of the portion of the pile body 6 located outside the cavity close to the pile cap 3, and the top of the spiral piece 5 abuts against the bottom surface of the bottom plate, clamping the bottom plate of the pile cap 3 between the clamping nut 4 and the spiral piece 5. After the pile body 6 is inserted into the cavity of the pile cap 3, the clamping nut 4 is rotated to move downward along the axial direction of the external thread segment until the clamping nut 4 abuts against the inner wall of the cavity, thereby tightly fixing the pile body 6 and the pile cap 3.

[0041] Through the cooperation of the external thread and the compression nut 4, a stable connection between the pile body 6 and the pile cap 3 can be ensured to avoid loosening or displacement, thereby improving the stability of the entire micropile foundation. The external thread and the compression nut 4 generate friction through rotation, and this friction will produce a self-locking effect under static load, so that the nut will not loosen by itself when not subjected to external force. This self-locking property provides a reliable connection between the pile body 6 and the pile cap 3.

[0042] Since the clamping nut 4 can rotate and move on the external thread, the construction personnel can adjust the position of the clamping nut 4 as needed to ensure that the connection between the pile body 6 and the pile cap 3 is tight and gapless, and the adjustability makes the connection more flexible and reliable. The connection formed by the external thread and the clamping nut 4 can withstand large tensile and shear forces. In the application of the mountain photovoltaic bracket 1, it can ensure that the pile body 6 will not separate from the pile cap 3 when subjected to various external forces, thereby improving the stability of the entire micro pile foundation.

[0043] The butt end of the pile body 6 is designed as a plug-in hole, and is coaxially distributed with the through hole 10 and the mounting hole. The formed mounting channel can match the column structure of the external photovoltaic bracket 1, and the photovoltaic bracket 1 can be welded and fixed to the pile cap 3. The pile body 6 can be directly inserted into the cavity of the pile cap 3 through the through hole 10. After the subsequent pouring of concrete, a gripping effect is formed between the hardened concrete and the pile body 6, which improves the connection strength between the concrete and the pile cap 3. The plug-in hole can facilitate the subsequent installation of the photovoltaic bracket 1. Of course, it is understandable that the plug-in hole can also adopt other forms of structure, such as threaded holes, so that a detachable connection is formed between the external photovoltaic bracket 1 and the pile body 6.

[0044] In this embodiment, the pile body 6 is a steel pipe, which is selected as the material of the pile body 6, and a conical pile tip 7 is set at one end of the pile body 6 extending outside the cavity. The conical pile tip 7 can penetrate the soil more easily, reducing the difficulty of construction. The steel pipe as the pile body 6 has high strength and stability, and the conical pile tip 7 enhances the penetration ability, so that the micro pile foundation can be applied to the formation conditions in mountainous areas.

[0045] The section of the pile body 6 outside the cavity is provided with slots, and the slots are distributed in the local sections of the pile body 6. The cross section of the pile body 6 where the slots are provided is as follows: Figure 3 As shown, the cross section of the pile body 6 without slots is as follows Figure 4 As shown, the grooves increase the contact area between the pile body 6 and the soil, thereby increasing the friction between the pile body 6 and the soil and improving the pull-out resistance of the pile body 6.

[0046] It can be understood that the groove can also be used as a slurry outlet hole. After the pile body 6 is placed in the stratum, slurry can be injected into the pile body 6 from the top of the pile body 6, so that the slurry is discharged from the groove, thereby combining with the soil around the pile body 6 to solidify and harden, thereby improving the bonding effect between the pile body 6 and the surrounding strata and improving the stability of the pile body 6.

[0047] like Figure 2 As shown, the pile cap 3 is a regular tetrahedral structure, the top plate and the bottom plate are square, which has good stability, can withstand large loads, effectively support the pile body 6 and the photovoltaic bracket 1, and ensure the stability of the entire micro pile foundation. Compared with other irregular or flat shapes, the regular tetrahedral structure can better resist forces and moments from different directions, thereby maintaining overall stability.

[0048] Since the top plate and bottom surface of the regular tetrahedral pile cap 3 are both square, the top surface of the pile cap 3 is a square top plate, the bottom surface of the pile cap 3 is a square bottom plate, the through hole 10 is located at the center of the bottom surface of the pile cap 3, the mounting hole is located at the center of the top surface of the pile cap 3, and the pile body 6 passes through the center of the pile cap 3, so that the pile body 6 is evenly stressed. Uniform force distribution can avoid local stress concentration and reduce the risk of structural deformation and damage.

[0049] The pyramidal shape of the pile cap 3 makes its internal space larger, which can be filled with more concrete or other reinforcing materials, thereby improving its bearing capacity and compressive strength. The side wall and bottom surface of the pile cap 3 provide a stable support for the pile body 6 to prevent the pile body 6 from tilting or moving when subjected to external forces.

[0050] like Figure 1 As shown, fixing the anchoring connector 8 on the side plate of the pile cap 3 between the top plate and the bottom plate can ensure a firm connection between the anchoring connector 9 and the pile cap 3 to avoid loosening or displacement.

[0051] The side plates of the prism structure of the pile cap 3 have a certain thickness and strength, which can withstand the tension and shear force transmitted from the anchor 9, and effectively prevent the connection from loosening or breaking. The anchor connector 8 can be made of bolts, steel plates, etc., which have high strength and durability, and can ensure that the connection between the anchor 9 and the pile cap 3 has sufficient strength. When tightening the connector, the torque or pre-tightening force can be controlled to ensure that the connection is tight and gapless, further improving the strength and stability of the connection.

[0052] The anchor 9 is connected to the pile cap 3 through the connector on the side plate, which can evenly distribute the tension or shear force borne by the anchor 9 to the pile cap 3, avoiding damage caused by stress concentration and improving the bearing capacity and stability of the entire micropile foundation.

[0053] Grouting holes 11 and exhaust holes 12 are provided on the top plate. The grouting holes 11 are used to connect to the external grouting pipe to inject concrete into the cavity of the pile cap 3; the exhaust holes 12 are used to exhaust the air in the cavity during the pouring process, ensuring that the concrete is dense and free of bubbles, ensuring the pouring quality of the concrete in the pile cap 3, and improving the strength and stability of the entire micropile foundation.

[0054] like Figure 1 As shown, a plurality of ribs 2 are arranged on the top plate of the pile cap 3, and the ribs 2 are distributed in an annular direction along the mounting hole. The ribs 2 can be used to connect and fix the photovoltaic bracket 1 that matches the mounting channel. The number and size of the ribs 2 can be selected and configured according to the size of the installed photovoltaic bracket 1.

[0055] The design of the rib 2 provides a clear positioning and support point for the installation of the photovoltaic bracket 1, provides a stable fixed support for the photovoltaic bracket 1, increases the connection strength between the rib 2 and the pile cap 3, and ensures that the photovoltaic module is not easily displaced or deformed when subjected to natural forces such as wind and snow.

[0056] The strength and rigidity of the ribs 2 can be adjusted and optimized as needed to meet the installation requirements under different environmental conditions, such as using steel plates, galvanized steel plates, etc., to ensure that the photovoltaic bracket 1 can maintain stable performance under different geographical and climatic conditions. The ribs 2 can disperse stress and avoid damage to photovoltaic modules caused by stress concentration.

[0057] The above detailed description of the specific implementation of the utility model is only used as an example, and the utility model is not limited to the specific implementation described above. For those skilled in the art, any equivalent modification or substitution of the utility model is also within the scope of the utility model. Therefore, the equalization, modification, improvement, etc. made without departing from the spirit and principle of the utility model should be included in the scope of the utility model.

Claims

1. A micro pile foundation for mountain photovoltaic support, characterized in that: include: The pile cap is a prism-shaped shell structure with a cavity formed inside. The bottom surface of the pile cap is provided with a through hole, the top surface is provided with a mounting hole, and the cavity is filled with concrete; The pile body has one end inserted into the cavity through the through hole to form a butt end, and the other end extends outside the cavity. The pile body is fixedly connected to the pile cap, and an installation channel for the photovoltaic bracket to pass through is formed between the installation hole and the butt end. A spiral piece is provided on the end of the pile body located outside the cavity and close to the pile cap; The anchor is distributed obliquely relative to the axis of the pile body. The anchoring section of the anchor is located outside the pile cap. The fixed section of the anchor passes through the side wall of the pile cap and extends into the cavity, and is fixed to the pile cap through an anchor connector to form an oblique pull.

2. The micro pile foundation for mountain photovoltaic support according to claim 1, characterized in that: The segment of the pile body located in the cavity is provided with an external thread, the external thread is matched with a clamping nut, and the clamping nut abuts against the inner wall of the cavity.

3. The micro pile foundation for mountain photovoltaic support according to claim 2, characterized in that: The butt end is a plug hole, and the via hole, the plug hole and the mounting hole are coaxially distributed.

4. The micro pile foundation for mountain photovoltaic support according to claim 1, 2 or 3, characterized in that: The pile body is a steel pipe, and one end of the pile body extending outside the cavity is provided with a conical pile tip.

5. The micro pile foundation for mountain photovoltaic support according to claim 4, characterized in that: A groove is provided on the segment of the pile body located outside the cavity. The groove is located on the side wall of the pile body and penetrates through the side wall of the pile body.

6. The micro pile foundation for mountain photovoltaic support according to claim 1, characterized in that: The pile cap is a regular tetrahedral structure, the top surface of the pile cap is a square top plate, the bottom surface of the pile cap is a square bottom plate, the through hole is located at the center of the bottom surface of the pile cap, and the installation hole is located at the center of the top surface of the pile cap.

7. The micro pile foundation for mountain photovoltaic support according to claim 6, characterized in that: The side length of the top plate is greater than that of the bottom plate, and the anchor connector is fixed on the side plate of the pile cap between the top plate and the bottom plate.

8. The micro pile foundation for mountain photovoltaic support according to claim 6 or 7, characterized in that: The top plate is provided with separate grouting holes and exhaust holes, and the grouting holes are used for connecting with external grouting pipes.

9. The micro pile foundation for mountain photovoltaic support according to claim 8, characterized in that: The top end of the spiral sheet abuts against the bottom surface of the bottom plate.

10. The micro pile foundation for mountain photovoltaic support according to claim 6 or 7, characterized in that: A plurality of ribs are arranged on the top plate of the pile cap, and the ribs are distributed in an annular direction along the mounting hole at intervals, and are used for connecting the photovoltaic bracket matched with the mounting channel.

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