Grouting anchoring type photovoltaic pile foundation structure and construction method thereof

Abstract

The invention provides a grouting anchoring type photovoltaic pile foundation structure and a construction method thereof.The grouting anchoring type photovoltaic pile foundation structure comprises a hollow pile body, a pile head is arranged at the lower end of the hollow pile body, a pile top connecting part is arranged at the upper end of the hollow pile body, a plurality of grouting hole channels are formed in the peripheral side of the pile head, and an auxiliary grouting pipe is arranged in the hollow pile body; the auxiliary grouting pipe comprises a grouting main pipe and a plurality of grouting branch pipes which are communicated, the grouting branch pipes and the grouting hole channels are connected in an inserted mode in a one-to-one correspondence mode, a tree-root-shaped anchoring body formed through the grouting branch pipes is arranged in the stratum on the periphery of the pile head, the tree-root-shaped anchoring body can be formed on the pile head, the pile-soil contact area is greatly increased, the occlusion effect is greatly improved, and the service life of the pile head is prolonged. The anti-overturning and anti-pulling capabilities of the photovoltaic pile foundation are enhanced, and the stability of the pile foundation is improved.

Description

Technical Field

[0001] This invention relates to the field of onshore photovoltaic power generation technology, and in particular to a grouting anchored photovoltaic pile foundation structure and its construction method. Background Technology

[0002] As a crucial component of renewable energy development, photovoltaic (PV) power generation is showing a general trend of simultaneous advancement from east to west and from centralized to distributed systems. Regions rich in unused land resources, such as deserts, Gobi deserts, and desertified lands, possess favorable physical conditions and land advantages for developing large-scale PV bases, and are gradually becoming key areas for large-scale PV power plant development and construction. Despite the significant advantages of desert regions at the macro-resource level, the following technical challenges remain in the specific civil engineering design and construction process: 1. The foundations in desert areas are mostly composed of aeolian sand, silt, gravel interlayers, and saline soil, which have poor gradation, low compaction, and insufficient bearing capacity, making it difficult to directly meet the requirements for pile foundation bearing capacity and deformation control. 2. Desert areas have high wind speeds year-round, and extreme wind loads place stringent requirements on the stability of photovoltaic support systems. The foundation structure must have good anti-overturning and anti-uplift properties. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a grouting anchored photovoltaic pile foundation structure that can solve the problem of insufficient anti-overturning performance of photovoltaic pile foundation structures in soft geological conditions such as deserts.

[0004] Therefore, the present invention adopts the following technical solution: A grouting anchored photovoltaic pile foundation structure includes a hollow pile body, a pile head at the lower end of the hollow pile body, a pile top connection at the upper end of the hollow pile body, multiple grouting channels around the pile head, an auxiliary grouting pipe inside the hollow pile body, the auxiliary grouting pipe including a main grouting pipe and multiple branch grouting pipes, the branch grouting pipes being inserted into the grouting channels one by one, and a root-like anchor body formed by the branch grouting pipes in the stratum around the pile head.

[0005] Based on the above technical solutions, the present invention may also employ the following further technical solutions, or combine these further technical solutions: The hollow pile body has several protrusions distributed along its axial direction.

[0006] The protrusion is shaped like a bamboo joint.

[0007] The pile head is conical, and the grouting channel is opened circumferentially downward along the conical surface of the pile head.

[0008] The auxiliary grouting pipe is equipped with a pusher, the shape of which is adapted to the auxiliary grouting pipe. The upper part of the pusher is connected to an elastic reset member, and the lower part of the pusher is inserted into the grouting branch pipe. One end of the lower part of the pusher is connected to a sealing plate, which can seal the port of the grouting branch pipe.

[0009] The upper end of the grouting main pipe is connected to a support plug, which is in communication with the grouting main pipe. The upper end of the jacking member is connected to the lower part of the support plug, and the elastic reset member is located between the support plug and the auxiliary grouting pipe.

[0010] The connection at the top of the pile is a flange.

[0011] Another objective of this invention is to overcome the shortcomings of the prior art and provide a construction method for a grouting anchored photovoltaic pile foundation structure, which can solve the problem of insufficient overturning resistance of photovoltaic pile foundation structures in soft geological conditions such as deserts.

[0012] Therefore, the present invention adopts the following technical solution: A construction method for a grouting anchored photovoltaic pile foundation structure includes the following steps: Step 1: Assemble the hollow pile body and auxiliary grouting pipe; Step 2: Connect the upper end of the hollow pile to the auxiliary limiting device, insert the hollow pile into the preset pile position, insert the grouting pipe into the hollow pile through the auxiliary limiting device, and insert the lower end of the grouting pipe into the bearing plug and connect it with the auxiliary grouting pipe. Step 3: Press down the grouting pipe, which will drive the jacking component to move downward. At this time, the elastic reset component is compressed, and the sealing plate is pushed open, so that the grouting branch pipe is connected to the outside. Step 4: Connect the grouting pipe to the grouting equipment through the grout delivery pipe, start the grouting equipment to perform an air pressure test, and observe the pressure gauge on the output side of the grout delivery pipe. If the pressure gauge reading rises to a certain level and then stabilizes, it is determined that the grouting branch pipe is unobstructed. If the pressure gauge reading continues to rise to the set value, the grouting equipment must be shut down and Step 3 must be repeated until the pressure gauge can read stably and the grouting branch pipe is unobstructed. Step 5: Inject grout into the soil around the pile head through the grout delivery pipe, grouting pipe, and auxiliary grouting pipe to form a root-like anchor body; Step 6: After the grout has solidified, remove the auxiliary limiting components, grout delivery pipe, and grout injection pipe, and install the photovoltaic support.

[0013] Based on the above technical solutions, the present invention may also employ the following further technical solutions, or combine these further technical solutions: Step 5 grouting is carried out in stages and intermittently, depending on the geological conditions. First, the initial grouting is carried out. After the grout reaches the initial setting time, one or more subsequent groutings are carried out. After the last grouting is completed, the grouting equipment is required to continue to run and inject air at the current pressure value. Grouting is stopped after the initial setting time of the grout is reached to ensure that the grout does not flow back and block the grouting pipe.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: it can form a root-like anchor body at the pile head, which greatly increases the contact area and interlocking effect between the pile and the soil, enhances the overturning and pull-out resistance of the photovoltaic pile foundation, and improves the stability of the pile foundation. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the grouting cross-sectional structure of the present invention.

[0017] Figure 3 This is a schematic diagram of the cross-sectional structure of the hammer pile of the present invention.

[0018] Figure 4 This is a detailed structural diagram of the auxiliary grouting pipe and pile head of the present invention.

[0019] Figure 5 This is a schematic diagram showing the connection between the sealing plate and the grouting pipe of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote elements with the same or similar functions throughout. However, it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present invention. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0022] The present invention provides a grouting anchored photovoltaic pile foundation structure, including a hollow pile body 1, a pile head 104 at the lower end of the hollow pile body 1, a pile top connection part 101 at the upper end of the hollow pile body 1, a plurality of grouting channels 105 on the periphery of the pile head 104, an auxiliary grouting pipe 107 inside the hollow pile body 1, the auxiliary grouting pipe 107 including a main grouting pipe and a plurality of branch grouting pipes, the branch grouting pipes being inserted into the grouting channels 105 one by one, and a root-like anchor body formed by the branch grouting pipes in the stratum around the pile head 104.

[0023] To facilitate the design and manufacturing of pile foundations, segmented assembly and welding can be carried out. Specifically, the pile head 104 and the auxiliary grouting pipe 107 are aligned with the grouting channel 105 and welded together. Then, the pile head 104 and the hollow pile body 1 are spliced ​​together and welded together.

[0024] In this embodiment, the hollow pile body 1 is a steel pile body.

[0025] The hollow pile body 1 has several protrusions 103 distributed along its axial direction.

[0026] The protrusion 103 is shaped like a bamboo joint.

[0027] In this embodiment, the hollow pile 1 has a smooth variable cross-section, such as... Figure 1 As shown, two bamboo-shaped protrusions 103 are equally distributed on the pile body of the hollow pile 1.

[0028] The pile head 104 is conical, and the grouting channel 105 is opened circumferentially downward along the conical surface of the pile head 104.

[0029] The auxiliary grouting pipe 107 is provided with a pusher 1071. The shape of the pusher 1071 is adapted to the auxiliary grouting pipe 107. An elastic reset member 1072 is connected to the upper part of the pusher 1071. The lower part of the pusher 1071 is inserted into the grouting branch pipe. A sealing piece 1074 is connected to one end of the lower part of the pusher 1071. The sealing piece 1074 can seal the port of the grouting branch pipe.

[0030] In this embodiment, the pusher 1071 is made of a cylindrical steel bar.

[0031] The upper end of the grouting main pipe is connected to the support plug 1073, which is connected to the grouting main pipe. The upper end of the pusher 1071 is connected to the lower end of the support plug 1073. The elastic reset member 1072 is located between the support plug 1073 and the auxiliary grouting pipe 107.

[0032] The connection part 101 at the top of the pile is a flange.

[0033] The present invention provides a construction method for a grouting anchored photovoltaic pile foundation structure, comprising the following steps: Step 1: Assemble the hollow pile body 1 and the auxiliary grouting pipe 107; Step 2: Connect the upper end of the hollow pile 1 to the auxiliary limiting piece 2, and insert the hollow pile 1 into the preset pile position. Before driving the pile, check whether the sealing piece 1074 seals the port of the grouting pipe. The grouting pipe 301 is inserted into the hollow pile 1 through the auxiliary limiting piece 2. The lower end of the grouting pipe 301 is inserted into the bearing piece 1073 and connected to the auxiliary grouting pipe 107. Step 3: Press down the grouting pipe 301, which drives the pusher 1071 to move downward. At this time, the elastic reset member 1072 is compressed, and the sealing piece 1074 is pushed open, so that the grouting branch pipe is connected to the outside. Step 4: The grouting pipe 301 is connected to the grouting equipment through the grout delivery pipe 3. The grouting equipment is started to perform an air pressure test. The pressure gauge 302 on the output side of the grout delivery pipe is observed. If the reading of the pressure gauge 302 rises to a certain level and then stabilizes, it is determined that the grouting branch pipe is unobstructed. If the reading of the pressure gauge 302 continues to rise to the set value, the grouting equipment needs to be shut down and Step 3 is repeated until the pressure gauge 302 can read stably and the grouting branch pipe is unobstructed. Step 5: Inject grout into the soil around the pile head 104 through grout delivery pipe 3, grouting pipe 301, and auxiliary grouting pipe 107 to form a root-like anchor body; Step 6: After the slurry has solidified, remove the auxiliary limiting component 2, the slurry delivery pipe 3, and the grouting pipe 301, and install the photovoltaic bracket.

[0034] Step 5 grouting adopts a step-by-step intermittent grouting method according to geological conditions. First, the initial grouting is carried out. After the grout reaches the initial setting time, one or more subsequent groutings are carried out. After the last grouting is completed, the grouting equipment is required to continue to run and inject air at the current pressure value. Grouting is stopped after the initial setting time of the grout is reached to ensure that the grout does not flow back and block the grouting pipe 301.

[0035] In this embodiment, the grouting material is a low-viscosity, highly penetrating, and fast-curing material such as resin.

[0036] In this embodiment, as Figure 1 As shown, the flange 101 has multiple bolt holes 102 circumferentially arranged, such as... Figure 2 As shown, the flange 101 and the auxiliary limiting member 2 are detachably connected by multiple bolts passing through the bolt holes 102, as... Figure 3 As shown, a rubber gasket 106 is also provided between the flange 101 and the auxiliary limiting component 2, which plays a role in preventing loosening and resisting vibration during piling.

[0037] In this embodiment, the grouting pipe 301 is tightly connected to the bearing plug 1073 by threads.

[0038] In this embodiment, as Figure 5As shown, the sealing piece 1074 is disposed on the outer wall of the grouting channel 105, with its lower end hinged to the port of the grouting channel 105. The sealing piece 1074 can rotate around the hinge. Since the rotation point of the sealing piece 1074 is located at the lower end, and the area of ​​the sealing piece 1074 is slightly larger than the cross-sectional area of ​​the grouting channel 105, during pile driving, the sealing piece 1074 is tightly attached to the grouting channel 105 to prevent soil from entering and blocking the grouting channel 105 during pile driving.

[0039] Based on the description and accompanying drawings of this invention, those skilled in the art can easily manufacture or use the grouting anchored photovoltaic pile foundation structure and its construction method of this invention, and can achieve the positive effects described in this invention.

[0040] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "installed," "set," "equipped with," "connected," "linked," and "sleeve" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral construction; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two mechanisms, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In the description of this invention, it should be understood that the terms "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

[0042] Furthermore, in practicing the claims of this invention, those skilled in the art can understand and influence variations to the disclosed embodiments through a study of the drawings, the disclosure, and the appended claims. Additionally, in the claims and description, words such as "comprising" and "containing" do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes and modifications made in accordance with the present invention are covered by the scope of the claims of the present invention, and will not be listed here.

Claims

1. A grouting anchored photovoltaic pile foundation structure, characterized in that, The system includes a hollow pile body (1), a pile head (104) at the lower end of the hollow pile body (1), a pile top connection part (101) at the upper end of the hollow pile body (1), a plurality of grouting channels (105) on the periphery of the pile head (104), an auxiliary grouting pipe (107) inside the hollow pile body (1), the auxiliary grouting pipe (107) including a main grouting pipe and a plurality of branch grouting pipes, the branch grouting pipes being inserted into the grouting channels (105) one by one, and a root-like anchor body formed by the branch grouting pipes in the stratum around the pile head (104).

2. The grouting anchored photovoltaic pile foundation structure as described in claim 1, characterized in that, The hollow pile body (1) has several protrusions (103) distributed along its axial direction.

3. The grouting anchored photovoltaic pile foundation structure as described in claim 2, characterized in that, The protrusion (103) is shaped like a bamboo joint.

4. The grouting anchored photovoltaic pile foundation structure as described in claim 1, characterized in that, The pile head (104) is conical, and the grouting channel (105) is opened circumferentially downward along the conical surface of the pile head (104).

5. The grouting anchored photovoltaic pile foundation structure as described in claim 1, characterized in that, The auxiliary grouting pipe (107) is provided with a pusher (1071), the shape of which is adapted to the auxiliary grouting pipe (107). An elastic reset member (1072) is connected to the upper part of the pusher (1071), and the lower part of the pusher (1071) is inserted into the grouting branch pipe. A sealing plate (1074) is connected to one end of the lower part of the pusher (1071), and the sealing plate (1074) can seal the port of the grouting branch pipe.

6. The grouting anchored photovoltaic pile foundation structure as described in claim 5, characterized in that, The upper end of the grouting main pipe is connected to a support plug (1073), the support plug (1073) is connected to the grouting main pipe, the upper end of the pusher (1071) is connected to the lower part of the support plug (1073), and the elastic reset member (1072) is located between the support plug (1073) and the auxiliary grouting pipe (107).

7. The grouting anchored photovoltaic pile foundation structure as described in claim 1, characterized in that, The pile top connection (101) is a flange.

8. A construction method for a grouting anchored photovoltaic pile foundation structure, characterized in that, Includes the following steps: Step 1: Assemble the hollow pile body (1) and the auxiliary grouting pipe (107). Step 2: Connect the upper end of the hollow pile body (1) to the auxiliary limiting component (2), insert the hollow pile body (1) into the preset pile position, insert the grouting pipe (301) into the hollow pile body (1) through the auxiliary limiting component (2), and insert the lower end of the grouting pipe (301) into the bearing component (1073) and connect it with the auxiliary grouting pipe (107). Step 3: Press down the grouting pipe (301) to drive the pusher (1071) to move downward. At this time, the elastic reset piece (1072) is compressed, and the sealing piece (1074) is pushed open, and the grouting branch pipe is connected to the outside. Step 4: The grouting pipe (301) is connected to the grouting equipment through the grout delivery pipe (3). The grouting equipment is started to perform an air pressure test. The pressure gauge (302) on the output side of the grout delivery pipe is observed. If the reading of the pressure gauge (302) rises to a certain level and then stabilizes, it is determined that the grouting branch pipe is unobstructed. If the reading of the pressure gauge (302) continues to rise to the set value, the grouting equipment needs to be shut down and Step 3 is repeated until the pressure gauge (302) can read stably and the grouting branch pipe is unobstructed. Step 5: The grouting liquid is injected into the strata around the pile head (104) through the grouting pipe (3), the grouting pipe (301), and the auxiliary grouting pipe (107) to form a root-like anchor body; Step 6: After the slurry has solidified, remove the auxiliary limiting component (2), slurry delivery pipe (3), and grouting pipe (301), and install the photovoltaic bracket.

9. The construction method of a grouting anchored photovoltaic pile foundation structure as described in claim 8, characterized in that, Step 5 grouting is carried out in stages and intermittently, depending on the geological conditions. First, the initial grouting is carried out. After the grout reaches the initial setting time, one or more subsequent groutings are carried out. After the last grouting is completed, the grouting equipment is required to continue to run and inject air at the current pressure value. Grouting is stopped after the initial setting time of the grout is reached to ensure that the grout does not flow back and block the grouting pipe (301).

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