Photovoltaic support microporous cast-in-place pile foundation

Abstract

This utility model belongs to the field of pile foundation technology, specifically a micro-hole cast-in-place pile foundation for photovoltaic supports. Pit holes are drilled in the ground, and concrete is poured into the holes to form piles. A vertically installed steel reinforcement cage, the same depth as the pile hole, is installed inside the pile hole. A pre-embedded steel pipe is embedded in the top of the pile, penetrating the top of the pile and extending into the foundation. Three evenly distributed anchoring steel bars are welded to the bottom of the pre-embedded steel pipe, with their bottoms contracted and welded together to form a triangle. This foundation replaces the conventional micro-hole cast-in-place pile foundation with a variable cross-section pile. The above-ground pile size is larger than the underground pile size, and it is integrally formed, reducing pile hole collapse and improving the pouring efficiency of the micro-hole cast-in-place pile foundation. Furthermore, the triangular connection of the anchoring steel bars in the pre-embedded steel pipe fully utilizes the concrete core area, effectively eliminating the problem of weak pull-out resistance of the pre-embedded steel pipe in the micro-hole cast-in-place pile foundation, thus ensuring the reliability of the pre-embedded steel pipe and providing a safety guarantee for photovoltaic power generation.

Description

Technical Field

[0001] This utility model belongs to the field of pile foundation technology, specifically relating to a micro-pore cast-in-place pile foundation for photovoltaic brackets. Background Technology

[0002] Micro-hole cast-in-place piles are often used as photovoltaic (PV) support foundations due to their advantages such as small cross-section, low material consumption, minimal excavation, rapid construction, and minimal vegetation damage. However, in photovoltaic projects with integrated farming and solar power, the high height of the modules and the large size of the embedded steel pipes make it crucial to secure these pipes within the micro-hole cast-in-place piles, given their fixed dimensions. As the connection between the PV support and the foundation, the pre-embedded steel pipes in the micro-hole pile foundation are vital; their instability will affect the stability of the upper support structure. Utility Model Content

[0003] The purpose of this invention is to propose a microporous cast-in-place pile foundation for photovoltaic supports, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A photovoltaic support micro-hole cast-in-place pile foundation includes a ground surface, on which pile holes 1 are drilled, and concrete is poured into the pile holes 1 to form a pile body; a pile reinforcement cage 2 of the same depth as the pile hole is vertically arranged in the pile hole 1.

[0006] A pre-embedded steel pipe 3 is pre-embedded at the top of the pile body. The pre-embedded steel pipe 3 penetrates the top of the pile body and extends into the foundation. Three anchoring steel bars 4 are welded to the bottom of the pre-embedded steel pipe 3 in a circumferentially evenly distributed manner. The bottom of the three anchoring steel bars 4 is contracted and welded together to form a triangular body.

[0007] Furthermore, the pile body includes an above-ground pile body and an underground pile body, both of which are cylindrical.

[0008] Furthermore, the diameter of the above-ground pile is larger than the diameter of the underground pile, and the above-ground pile and the underground pile are integrally formed.

[0009] Furthermore, the depth of the pile hole 1 is 2 to 3 m.

[0010] Furthermore, the pile reinforcement cage 2 includes main reinforcement 2-1 and stirrups 2-2, with the stirrups 2-2 spirally welded to the main reinforcement 2-1.

[0011] Furthermore, the number of main reinforcing bars 2-1 is 4 to 6.

[0012] Furthermore, the diameter of the main reinforcing bar 2-1 is 10mm or 12mm.

[0013] Furthermore, the diameter of the stirrup 2-1 is 6mm, and the stirrup spacing is 100-250mm.

[0014] Furthermore, the diameter of the anchoring steel bar 4 is 10mm.

[0015] Furthermore, the length of the anchoring steel bar 4 is 900-1000 mm.

[0016] Compared with the prior art, the support steel pipe of this utility model has the following advantages:

[0017] (1) This utility model changes the conventional micro-hole cast-in-place pile foundation into a variable cross-section pile body. The above-ground pile body is larger than the underground pile body, and is integrally formed, which reduces pile hole collapse and improves the pouring efficiency of micro-hole cast-in-place pile foundation.

[0018] (2) The anchoring steel bars of the pre-embedded steel pipe of the micro-hole cast-in-place pile foundation are connected in a triangular shape. The interconnected anchoring steel bars are no longer independent individuals. They make full use of the core area of ​​the concrete and effectively eliminate the influence of the weak pull-out resistance of the pre-embedded steel pipe of the micro-hole cast-in-place pile foundation, thereby ensuring the reliability of the pre-embedded steel pipe of the micro-hole cast-in-place pile foundation and providing a safety guarantee for photovoltaic power generation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the elevation of a photovoltaic support micro-hole grouting pile foundation according to this utility model;

[0020] Figure 2 This is a schematic cross-sectional view of a micro-hole grouting pile foundation for a photovoltaic support according to this utility model;

[0021] Among them: 1. Pile hole, 2. Pile body reinforcement cage, 2-1. Main reinforcement, 2-2. Stirrups, 3. Embedded steel pipe, 4. Anchor reinforcement. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0023] Example

[0024] like Figure 1As shown, this utility model proposes a micro-hole cast-in-place pile foundation for a photovoltaic support, including a ground surface, on which a pile hole 1 is drilled, the depth of which is 2-3m, and concrete is poured into the pile hole 1 to form a pile body; a pile reinforcement cage 2 of the same depth as the pile hole is vertically arranged in the pile hole 1.

[0025] The pile reinforcement cage 2 includes main bars 2-1 and stirrups 2-2. The stirrups 2-2 are spirally welded to the main bars 2-1. The number of main bars 2-1 is 4 to 6, and the diameter is 10 mm or 12 mm. The diameter of the stirrups 2-1 is 6 mm, and the spacing between the stirrups is 100 to 250 mm. The material is HPB300 and HRB400. The main bars and stirrups are spirally welded on site. Its size is slightly smaller than the pile body, and it forms a reinforced concrete structure with the pile body to better bear the load of the upper photovoltaic support.

[0026] An embedded steel pipe 3 is pre-embedded at the top of the pile body, mainly serving as the connection between the pile foundation and the upper support. It is usually a steel pipe. The embedded steel pipe 3 penetrates the top of the pile body and extends into the foundation. Three anchoring steel bars 4 are welded to the bottom of the embedded steel pipe 3 in a circumferentially evenly distributed manner. The diameter of the anchoring steel bars 4 is 10mm and the length of the anchoring steel bars 4 is 900-1000mm. The bottom of the three anchoring steel bars 4 is contracted and welded together to form a triangular body, which is mainly used to fix the embedded steel pipe in the pile body. Compared with the traditional straight anchor, it has better stress resistance, and the embedded steel pipe is easier to put into the concrete and is less likely to cause the anchoring steel bars to bend.

[0027] The pile body includes an above-ground pile body and an underground pile body, both of which are cylindrical. The diameter of the above-ground pile body is larger than that of the underground pile body, and the above-ground pile body and the underground pile body are integrally formed. This design not only facilitates concrete pouring, but also reduces pile hole collapse and improves the pouring efficiency of micro-hole cast-in-place pile foundations.

[0028] On-site binding of the pile reinforcement cage 2, placement of the pile reinforcement cage 2 into the drilled pile hole, pouring half of the pile body into the drilled pile hole, welding the anchor reinforcement 4 to the pre-embedded steel pipe 3, placing the welded pre-embedded steel pipe into the pile hole, and pouring the complete pile body.

[0029] The specific structure of the micro-porous cast-in-place pile foundation for the photovoltaic support of this utility model is as follows:

[0030] The first step is to excavate the concrete pile hole at the designated location using a rotary drilling machine. The depth of the concrete pile hole is set according to the design requirements.

[0031] The second step is to fabricate the steel cage. The main reinforcement bars of the steel cage can usually be Ф10 or Ф12, and the number of main reinforcement bars is usually 4 to 6. The stirrups of the steel cage are usually Ф6, and the stirrup spacing is usually 100mm to 250mm.

[0032] The third step is to fabricate the pre-embedded steel pipe 3 and weld the anchoring steel bar 4 at the bottom of the pre-embedded steel pipe. The anchoring steel bar can usually be Ф10 or Ф12. The ends of the anchoring steel bar are contracted and welded together to form a triangular body, which is better than the traditional straight anchor in terms of stress. Moreover, it is easier to put the pre-embedded steel pipe into the concrete and it is less likely to cause the anchoring steel bar to bend.

[0033] The fourth step involves placing the pre-fabricated reinforcing cage into the drilled pile hole, pouring half of the mixed concrete into the hole, inserting the pre-embedded steel pipe into the hole, and then pouring the remaining concrete into the hole. The diameter of the portion protruding above ground is then increased by 50-100mm to facilitate formwork and prevent pile hole collapse. After pouring and foundation curing are complete, the formwork is removed, forming the concrete pile.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A photovoltaic support micro-hole cast-in-place pile foundation, comprising a ground surface, characterized in that: A pile hole (1) is drilled in the ground, and concrete is poured into the pile hole to form a pile body; a pile reinforcement cage (2) with the same depth as the pile hole is vertically installed in the pile hole (1); The top of the pile is pre-embedded with a pre-embedded steel pipe (3), which penetrates the top of the pile and extends into the foundation. The bottom of the pre-embedded steel pipe (3) is welded with three anchoring steel bars (4) that are evenly distributed in a circle. The bottom of the three anchoring steel bars (4) is contracted and welded together to form a triangular body.

2. The photovoltaic support micro-hole cast-in-place pile foundation according to claim 1, characterized in that: The pile body includes an above-ground pile body and an underground pile body, both of which are cylindrical.

3. The photovoltaic support micro-hole cast-in-place pile foundation according to claim 2, characterized in that: The diameter of the above-ground pile is larger than that of the underground pile, and the above-ground pile and the underground pile are integrally formed.

4. The photovoltaic support micro-hole cast-in-place pile foundation according to claim 1, characterized in that: The depth of the pile hole (1) is 2 to 3 m.

5. A photovoltaic support micro-hole cast-in-place pile foundation according to claim 1, characterized in that: The pile reinforcement cage (2) includes main reinforcement (2-1) and stirrups (2-2), with the stirrups (2-2) spirally welded to the main reinforcement (2-1).

6. A photovoltaic support micro-hole cast-in-place pile foundation according to claim 5, characterized in that: The number of main reinforcing bars (2-1) is 4 to 6.

7. A photovoltaic support micro-hole cast-in-place pile foundation according to claim 5, characterized in that: The diameter of the main reinforcement (2-1) is 10mm or 12mm.

8. A photovoltaic support micro-hole cast-in-place pile foundation according to claim 5, characterized in that: The diameter of the stirrup (2-2) is 6mm, and the stirrup spacing is 100-250mm.

9. A photovoltaic support micro-hole cast-in-place pile foundation according to claim 1, characterized in that: The diameter of the anchoring steel bar (4) is 10 mm.

10. A photovoltaic support micro-hole cast-in-place pile foundation according to claim 1, characterized in that: The length of the anchoring steel bar (4) is 900-1000 mm.

Images