Pile foundation injection device and injection method, photovoltaic power station pile foundation system

Abstract

This disclosure relates to the field of photovoltaic power plant technology, and more particularly to a pile foundation injection device and injection method, and a photovoltaic power plant pile foundation system. The pile foundation injection device includes a pile pipe, a first sealing member, and a second sealing member. The pile pipe has a first injection hole and a second injection hole on its wall. The first sealing member is inserted into the first injection hole and is configured to break or leave the first injection hole when the pressure inside the pile pipe is greater than or equal to a first pressure, allowing fluid inside the pile pipe to be injected into the ground through the first injection hole. The second sealing member is inserted into the second injection hole and is configured to break or leave the second injection hole when the pressure inside the pile pipe is greater than or equal to a second pressure, allowing fluid inside the pile pipe to be injected into the ground through the second injection hole. The first pressure is less than the second pressure. Embodiments of this disclosure can effectively improve the anchorage capacity of pile foundations.

Description

Technical Field

[0001] This disclosure relates to the field of photovoltaic power plant technology, and in particular to a pile foundation injection device and injection method, and a photovoltaic power plant pile foundation system. Background Technology

[0002] Against the backdrop of the rapid development of the global new energy industry, photovoltaic power generation, as an important form of clean and renewable energy, is constantly expanding its application scenarios to complex environments such as mountains, rocky desertification areas, lava fields, and abandoned mining areas.

[0003] In building photovoltaic power plants in the desert, the pile foundation system and support structure are the "backbone" supporting the entire power plant. They must not only bear the weight of the photovoltaic panels and their components, but also withstand the extreme conditions of the desert environment, such as strong winds, sandstorms, and moving sand dunes. The pile foundation system is mostly located underground and is usually invisible, while the support structure sits on top of the pile foundation system, and the photovoltaic panels are installed on the support structure.

[0004] The deepest point of the pile foundation system is typically located 2 to 4 meters underground to ensure penetration of the active sand layer and into the bearing layer, thereby resisting the horizontal thrust brought by wind and sand movement. The anchoring capacity of the pile foundation directly determines the wind resistance stability and settlement resistance performance of the photovoltaic modules. Summary of the Invention

[0005] This disclosure provides a pile foundation injection device and injection method, as well as a photovoltaic power station pile foundation system, which can effectively improve the anchoring capacity of the pile foundation.

[0006] According to a first aspect of this disclosure, a pile foundation injection apparatus is provided, comprising: The pile pipe has a first injection hole and a second injection hole on its pipe wall; A first sealing element is inserted into a first injection hole, and the first sealing element is configured to break or detach from the first injection hole when the pressure inside the pile tube is greater than or equal to a first pressure, so that fluid inside the pile tube can be injected into the ground through the first injection hole; and The second sealing element is sealed in the second injection hole, and the second sealing element is configured to break or leave the second injection hole when the pressure in the pile tube is greater than or equal to the second pressure, so that the fluid in the pile tube can be injected into the ground through the second injection hole. The first pressure is less than the second pressure.

[0007] In some embodiments, the pile foundation injection device further includes a third sealing member, a third injection hole is provided on the wall of the pile tube, the third sealing member is sealed in the third injection hole, and the third sealing member is configured to break or leave the third injection hole when the pressure in the pile tube is greater than or equal to the third pressure, so that the fluid in the pile tube can be injected into the ground through the third injection hole, where the second pressure is less than the third pressure.

[0008] In some embodiments, there are multiple first injection holes and multiple second injection holes, and the first injection holes and the second injection holes are arranged crosswise along the length of the pile pipe.

[0009] In some embodiments, the pile foundation injection device further includes a barrier that can be inserted into a predetermined position within the pile tube. The barrier is configured to prevent fluid located above the barrier within the pile tube from entering below the barrier, so that fluid within the pile tube is injected into the ground through a hole in the tube wall located above the barrier.

[0010] In some embodiments, the pile foundation injection device further includes a positioning element and an injection tube. The positioning element is disposed inside the pile tube, and the lower part of the pile tube is provided with an outlet hole. One end of the injection tube is connected to the positioning element, and the other end of the injection tube extends out from the outlet hole so that the fluid in the pile tube is injected into the ground through the injection tube.

[0011] In some embodiments, the injection tube is provided with a plurality of fourth injection holes arranged at intervals along the length of the injection tube.

[0012] In some embodiments, the positioning member has a spherical space inside, and one end of the injection tube includes a spherical connecting part, which is disposed within the spherical space.

[0013] In some embodiments, the spherical connector is provided with an inlet that communicates with the internal cavity of the injection tube, and the positioning member is provided with a connecting channel that connects the internal cavity of the pile tube and the inlet, so that the liquid in the pile tube can enter the injection tube.

[0014] In some embodiments, the pile foundation injection device further includes a guide member disposed inside the pile tube. The guide member has a guide channel, and the injection tube enters the guide channel from the inlet of the guide channel. The outlet of the guide channel is connected to the injection hole.

[0015] In some embodiments, the guide member is frustum-shaped, the area of ​​the upper end face of the guide member is smaller than the area of ​​the lower end face, and the guide channel extends downward at an angle along the side of the guide member.

[0016] In some embodiments, the pile foundation injection device further includes a push rod configured to push the positioning element and guide element from the upper end of the pile tube to the lower end of the pile tube.

[0017] In some embodiments, the end of the push rod is provided with a docking portion, the top of the positioning member is provided with a first docking groove, the top of the guide member is provided with a second docking groove, the docking portion can be inserted into the first docking groove or the second docking groove, and the docking portion, the first docking groove and the second docking groove are all configured to make the docking portion unable to rotate in the first docking groove or the second docking groove.

[0018] In some embodiments, the pile foundation injection device further includes a gathering plate with multiple gathering holes and multiple injection tubes, which are respectively inserted into the multiple gathering holes. The gathering plate is movably fitted onto the injection tubes so that the multiple injection tubes are gathered towards the center by the movement of the gathering plate relative to the injection tubes.

[0019] According to a second aspect of this disclosure, a photovoltaic power plant foundation system is provided, including the aforementioned foundation injection device.

[0020] According to a third aspect of this disclosure, an injection method based on the above-described pile foundation injection device is provided, comprising: Injecting a first liquid into the pile pipe at a pressure greater than or equal to the first pressure and less than the second pressure causes the first sealing element to break or detach from the first injection hole, allowing the first liquid to be injected into the ground through the first injection hole; and / or, A second liquid is injected into the pile pipe at a pressure greater than or equal to the second pressure, causing the second sealing element to break or leave the second injection hole, so that the second liquid can be injected into the ground through the second injection hole.

[0021] In some embodiments, the pile foundation injection device further includes a third sealing element, wherein a third injection hole is provided on the wall of the pile tube, the third sealing element is sealed in the third injection hole, and the third sealing element is configured to break or leave the third injection hole when the pressure inside the pile tube is greater than or equal to a third pressure, so that fluid inside the pile tube can be injected into the ground through the third injection hole, wherein the second pressure is less than the third pressure. The pressure at which the second liquid is injected is greater than or equal to the second pressure and less than the third pressure; Injection methods also include: A third liquid is injected into the pile pipe at a pressure greater than or equal to the third pressure, causing the third sealing element to break or leave the third injection hole, so that the third liquid can be injected into the ground through the third injection hole.

[0022] In some embodiments, the injection method includes: In the desert sand layer, a sand-fixing agent is injected into the pile pipe at a pressure greater than or equal to the first pressure and less than the second pressure, causing the first sealing component to break or leave the first injection hole, so that the sand-fixing agent can be injected into the ground through the first injection hole. In the clay layer, cement clay slurry is first injected into the pile pipe at a pressure greater than or equal to the first pressure and less than the second pressure, so that the first sealing element is broken or leaves the first injection hole, so that the cement clay slurry can be injected into the ground through the first injection hole. Then, inject cement and water glass double-liquid grout or microbial mineralization grout into the pile pipe at a pressure greater than or equal to the second pressure and less than the third pressure, so that the second sealing component breaks or leaves the second injection hole, and the cement and water glass double-liquid grout or microbial mineralization grout is injected into the ground through the second injection hole; In any soil layer, high-pressure water is injected into the pile pipe at a pressure greater than or equal to the third pressure, causing the third sealing element to break or leave the third injection hole, so that the high-pressure water can be injected into the ground through the third injection hole.

[0023] Based on the above technical solution, in this embodiment of the present disclosure, two types of holes, a first injection hole and a second injection hole, are provided on the wall of the pile pipe. These two types of holes are respectively sealed with a first sealing element and a second sealing element. Moreover, the first sealing element breaks or leaves the first injection hole when the pressure inside the pile pipe reaches a first pressure, and the second sealing element breaks or leaves the second injection hole when the pressure inside the pile pipe reaches a second pressure. The first pressure is less than the second pressure. Therefore, the pile foundation injection device embodiment provided by this disclosure can not only inject reinforcing agents into the ground to improve the anchoring capacity of the pile pipe by breaking or leaving the sealing element, but also use the different pressure tolerance of the two types of sealing elements in the two types of holes to open the two types of injection holes at different times, so as to inject different fluids according to different strata and improve the adaptability of the pile foundation to different strata. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of this disclosure and are used to explain this disclosure, but do not constitute an undue limitation of this disclosure. In the drawings: Figure 1 The diagram shows some embodiments of the pile foundation injection device provided in this disclosure.

[0025] Figure 2 Schematic diagrams of other embodiments of the pile foundation injection device provided in this disclosure.

[0026] Figure 3 This is a schematic diagram of the arrangement of the first injection hole in some embodiments of the pile foundation injection device provided in this disclosure.

[0027] Figure 4 This is a partial structural schematic diagram of the barrier element in some embodiments of the pile foundation injection device provided in this disclosure.

[0028] Figure 5 This is a schematic diagram of the barrier structure in some embodiments of the pile foundation injection device provided in this disclosure.

[0029] Figure 6 This is a partial structural schematic diagram of some embodiments of the pile foundation injection device provided in this disclosure.

[0030] Figure 7 This is a schematic diagram of the structure of the injection tube in some embodiments of the pile foundation injection device provided in this disclosure.

[0031] Figure 8 This is a top view of the injection tube in some embodiments of the pile foundation injection device provided in this disclosure.

[0032] Figure 9 Exploded views of the injection tube, positioning element, and collecting plate in some embodiments of the pile foundation injection device provided in this disclosure.

[0033] Figure 10 This is a schematic diagram of the structure of the injection tube, positioning element and collecting plate in some embodiments of the pile foundation injection device provided in this disclosure.

[0034] Figure 11 This is a schematic diagram of the structure of the first positioning part in some embodiments of the pile foundation injection device provided in this disclosure.

[0035] Figure 12 This is a top view of the first positioning part in some embodiments of the pile foundation injection device provided in this disclosure.

[0036] Figure 13 This is a bottom view of the first positioning part in some embodiments of the pile foundation injection device provided in this disclosure.

[0037] Figure 14 This is a cross-sectional view of the first positioning part in some embodiments of the pile foundation injection device provided in this disclosure.

[0038] Figure 15 This is a schematic diagram of the structure of the second positioning part in some embodiments of the pile foundation injection device provided in this disclosure.

[0039] Figure 16 This is a top view of the second positioning part in some embodiments of the pile foundation injection device provided in this disclosure.

[0040] Figure 17 This is a schematic diagram of the structure of the seal in some embodiments of the pile foundation injection device provided in this disclosure.

[0041] Figure 18 This is a top view of the seal in some embodiments of the pile foundation injection device provided in this disclosure.

[0042] Figure 19 This is a schematic diagram of the structure of the guide component in some embodiments of the pile foundation injection device provided in this disclosure.

[0043] Figure 20 The image shows a bottom view of the guide element in some embodiments of the pile foundation injection device provided in this disclosure.

[0044] Figure 21 This is a top view of the guide element in some embodiments of the pile foundation injection device provided in this disclosure.

[0045] Figure 22 This is a schematic diagram of the internal structure of the lower end of the pile tube in some embodiments of the pile foundation injection device provided in this disclosure.

[0046] Figure 23This is a schematic diagram of the push rod structure in some embodiments of the pile foundation injection device provided in this disclosure.

[0047] Figure 24 The image shows a bottom view of the push rod in some embodiments of the pile foundation injection device provided in this disclosure.

[0048] Figure 25 This is a schematic diagram of the structure of the injection tube in a retracted state in some embodiments of the pile foundation injection device provided in this disclosure.

[0049] Figure 26 This is a schematic diagram of the structure of the collecting disc in some embodiments of the pile foundation injection device provided in this disclosure.

[0050] Figure 27 The image shows a bottom view of the condenser plate in some embodiments of the pile foundation injection device provided in this disclosure.

[0051] Figure 28 This is a schematic diagram of the structure of the first sealing cap in some embodiments of the pile foundation injection device provided in this disclosure.

[0052] Figure 29 This is a schematic diagram of the structure of the second sealing cap in some embodiments of the pile foundation injection device provided in this disclosure.

[0053] Figure 30 This is a schematic diagram of the structure of the third sealing cap in some embodiments of the pile foundation injection device provided in this disclosure.

[0054] Figure 31 This is a partial structural schematic diagram of the pile foundation drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0055] Figure 32 This is a schematic diagram of the structure of the pile foundation drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0056] Figure 33 This is a schematic diagram of the structure of the hole-expanding wing retracting into the sleeve of the pile foundation drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0057] Figure 34 This is a schematic diagram of the structure of the hole-expanding wing of the pile foundation drilling device extending outside the sleeve in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0058] Figure 35 This is a schematic diagram of the connection structure of the hole-expanding wing and connecting plate of the pile foundation drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0059] Figure 36 This is a schematic diagram of the structure of the hole-expanding wing of the pile foundation drilling device in a retracted state in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0060] Figure 37 This is a schematic diagram of the structure of the hole-expanding wing of the pile foundation drilling device in the deployed state in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0061] Figure 38 This is a partial structural schematic diagram of the drive rod of the pile drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0062] Figure 39 This is a schematic diagram of the drill bit structure of the pile foundation drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0063] Figure 40 This is a schematic diagram of the internal structure of the drill bit connection part of the pile foundation drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0064] Figure 41 This is a perspective view of the drill bit of the pile foundation drilling device in some embodiments of the photovoltaic power plant pile foundation system provided in this disclosure.

[0065] Figure 42 This is a schematic diagram of the drive connection part of the pile foundation drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0066] Figure 43 This is a schematic diagram of the internal structure of the drive connection part of the pile foundation drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0067] Figure 44 This is a schematic diagram of the structure of the first screw of the pile drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0068] Figure 45 This is a schematic diagram of the structure of the centralizing ring of the pile foundation drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0069] Figure 46 This is a schematic diagram of the structure of the sleeve of the pile foundation drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0070] Figure 47 This is a cross-sectional view of the sleeve of the pile drilling device in some embodiments of the photovoltaic power plant pile foundation system provided in this disclosure.

[0071] Figure 48 This is a bottom view of the sleeve of the pile drilling device in some embodiments of the photovoltaic power plant pile foundation system provided in this disclosure.

[0072] Figure 49This is a schematic diagram of the sealing ring structure of the pile foundation drilling device in some embodiments of the photovoltaic power station pile foundation system provided in this disclosure.

[0073] In the picture: 100. Photovoltaic power station pile foundation system; 10. Pile foundation injection device; 101. Pile tube; 1010. Center hole; 1011. First injection hole; 1012. Second injection hole; 1013. Third injection hole; 1014. Exit hole; 1015. Limiting boss; 102. First sealing component; 103. Second sealing component; 104. Third sealing component; 105. Barrier component; 1051. Barrier component body; 1052. First mounting groove; 1053. First sealing ring; 106. Positioning component; 1061. First positioning part; 10611. First positioning hole; 10612. First mating groove; 10613. Second mounting groove; 10614. Second sealing ring; 10615. First connecting hole; 1062, Second positioning part; 10621, Second positioning hole; 10622, Second connecting hole; 1063, Seal; 10631, Third positioning hole; 10632, Third connecting hole; 1064. Connectors; 107. Injection tube; 1071. Fourth injection port; 108. Guide component; 1081. Guide channel; 1082. Upper end face; 1083. Lower end face; 1084. Side; 1085. Limiting groove; 1086. Second docking groove; 109. Push rod; 1091. Connecting part; 1092. Push rod body; 1093. Support ring; 110. Gathering plate; 1101. Gathering hole; 111. Mounting frame; 112. Rotary drilling rig with integrated fluid injection system; 113. Vibration damping pad; 114. Locking device; 115. Control device; 116. First sealing cover; 117. Second sealing cover; 1171. Injection hole; 118. Third sealing cover; 1181. Water injection hole; 20. Pile foundation drilling equipment; 151. Drill bit; 1511. Protrusion; 1512. Drill bit body; 1513. Drill bit connecting part; 1514. Cutting blade; 1515. Third cavity; 1516. Second through hole; 1517. Fourth cavity; 1518. Third through hole; 152. Enlarged aperture wing; 153. Connecting piece; 1531. Connecting piece body; 1532. Mounting part; 154. Drive rod; 1541. Recessed portion; 1542. First through hole; 1543. Second cavity; 155. Elastic components; 156. Drive shaft; 1561. First cavity; 1562. Drive shaft body; 1563. Sleeve; 1564. Telescopic hole; 1565. Sand baffle; 1566. Second internal thread; 1567. Drive connection part; 1568. First internal thread; 157. First screw; 1571. First hole; 1572. Second hole; 158. Straightening ring; 1581. Straightening hole; 159. Second screw; 160. Sealing ring; 1601. Fourth through hole; 161. First bearing; 162. Second bearing; 163. Third bearing. Detailed Implementation

[0074] The technical solutions in the embodiments of this disclosure will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0075] In the description of this disclosure, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure.

[0076] like Figure 1As shown, in some embodiments of the pile foundation injection device provided in this disclosure, the pile foundation injection device 10 includes a pile pipe 101, a first sealing member 102, and a second sealing member 103. The pipe wall of the pile pipe 101 is provided with a first injection hole 1011 and a second injection hole 1012. The first sealing member 102 is sealed in the first injection hole 1011, and the first sealing member 102 is configured to break or leave the first injection hole 1011 when the pressure in the pile pipe 101 is greater than or equal to a first pressure, so that the fluid in the pile pipe 101 can be injected into the ground through the first injection hole 1011. The second sealing member 103 is sealed in the second injection hole 1012, and the second sealing member 103 is configured to break or leave the second injection hole 1012 when the pressure in the pile pipe 101 is greater than or equal to a second pressure, so that the fluid in the pile pipe 101 can be injected into the ground through the second injection hole 1012. The first pressure is less than the second pressure.

[0077] The pile pipe 101 is a tubular structure that is hollow and has a central hole 1010. The pile pipe 101 is buried underground and is used to support the support structure of the desert photovoltaic power station, which in turn supports the photovoltaic panels.

[0078] In this embodiment, a first sealing member 102 is provided in the first injection hole 1011 on the wall of the pile pipe 101. In the initial state, the first sealing member 102 seals the first injection hole 1011, making the first injection hole 1011 closed, and the fluid in the pile pipe 101 cannot be discharged through the first injection hole 1011. When the pressure in the pile pipe 101 reaches the first pressure (i.e., the pressure in the pile pipe 101 is greater than or equal to the first pressure), the first sealing member 102 may break under the action of the first pressure, or it may be directly rushed out by the pressure and leave the first injection hole. Whether the perforation 1011 is broken or forced out by pressure, the result is that the first sealing element 102 leaves the first injection hole 1011, making the first injection hole 1011 open. At this time, the fluid in the pile pipe 101 can be discharged through the first injection hole 1011. After the fluid is discharged, it can be injected into the ground. When the fluid is a reinforcing agent, it can reinforce the pile pipe 101, making the pile pipe 101 more stable, improving the anchoring capacity of the pile pipe 101, and better resisting the test of the extreme desert environment. In turn, it can improve the wind resistance stability and anti-settlement performance of the support frame and the photovoltaic panels on the support frame supported by the pile pipe 101.

[0079] Correspondingly, a second sealing element 103 is provided in the second injection hole 1012 on the wall of the pile pipe 101. In the initial state, the second sealing element 103 seals the second injection hole 1012, keeping the second injection hole 1012 closed, and the fluid in the pile pipe 101 cannot be discharged through the second injection hole 1012. When the pressure in the pile pipe 101 reaches the second pressure (i.e., the pressure in the pile pipe 101 is greater than or equal to the second pressure), the second sealing element 103 may break under the action of the second pressure, or it may be directly pushed out by the pressure and leave the second injection hole. Whether it breaks or is forced out by pressure, the result is that the second sealing component 103 leaves the second injection hole 1012, making the second injection hole 1012 open. At this time, the fluid in the pile pipe 101 can be discharged through the second injection hole 1012. After the fluid is discharged, it can be injected into the ground. When the fluid is a reinforcing agent, it can reinforce the pile pipe 101, making the pile pipe 101 more stable, improving the anchoring capacity of the pile pipe 101, better resisting the test of the extreme desert environment, and thus improving the wind resistance stability and anti-settlement performance of the support frame and photovoltaic panels on the support frame supported by the pile pipe 101.

[0080] In the above embodiments, the wall of the pile pipe 101 is provided with two types of holes: a first injection hole 1011 and a second injection hole 1012. These two types of holes are respectively sealed with a first sealing member 102 and a second sealing member 103. Moreover, the first sealing member 102 breaks or leaves the first injection hole 1011 when the pressure inside the pile pipe 101 reaches a first pressure, and the second sealing member 103 breaks or leaves the second injection hole 1012 when the pressure inside the pile pipe 101 reaches a second pressure. The first pressure is less than the second pressure. Therefore, the pile foundation injection device 10 embodiment provided in this disclosure can not only inject reinforcing agents into the ground to improve the anchoring capacity of the pile pipe 101 by breaking or leaving the sealing member, but also use the different pressure tolerance of the two types of sealing members in the two types of holes to open the two types of injection holes at different times, so as to inject different fluids according to different strata and improve the adaptability of the pile foundation to different strata.

[0081] In some embodiments, the first sealing element 102 includes environmentally friendly foam, such as polyurethane foam.

[0082] The pressure at which the first sealing element 102 breaks or leaves the first injection hole 1011 is relatively small, making it suitable for injecting sand-fixing agents into sand layers or implementing low-pressure grouting in clay layers during construction.

[0083] In some embodiments, the first pressure is 0.5~1.0 MPa, such as 0.6~0.8 MPa. Specifically, it can be 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, 1.0 MPa, etc.

[0084] In some embodiments, the second sealing element 103 adopts a double-layer composite structure, with the outer layer comprising a biodegradable plastic film, such as a polyvinyl alcohol film (PVA film), and the inner layer comprising hardened gypsum or sintered ceramic.

[0085] The pressure of the second sealing component 103 breaking or leaving the second injection hole 1012 is relatively high, making it suitable for high-pressure fracturing grouting in clay layers during construction, or for ecological water replenishment or nutrient replenishment in sand layers during operation.

[0086] In some embodiments, the second pressure is 1.2~3.0 MPa. For example, when replenishing water or nutrient solution in sand layers, the second pressure can be 1.5~2.0 MPa, specifically 1.5 MPa, 1.6 MPa, 1.7 MPa, 1.8 MPa, 1.9 MPa, 2.0 MPa, etc.; when fracturing grouting in clay layers, the second pressure can be 2.0~2.5 MPa, specifically 2.0 MPa, 2.1 MPa, 2.2 MPa, 2.3 MPa, 2.4 MPa, 2.5 MPa, etc.

[0087] In some embodiments, there are multiple first injection holes 1011 and second injection holes 1012, and the first injection holes 1011 and second injection holes 1012 are arranged crosswise along the length direction of the pile pipe 101.

[0088] By setting multiple first injection holes 1011 and multiple second injection holes 1012 to be arranged crosswise along the length of the pile tube 101, the first injection holes 1011 and the second injection holes 1012 can be set at intervals along the length of the pile tube 101, which can meet the needs of injecting different fluids at different depths and also meet the different pressure bearing capacities of different strata at different depths, thus further improving the adaptability to different strata.

[0089] In some embodiments, along the length of the pile tube 101, a plurality of first regions and a plurality of second regions are provided at intervals on the pile tube 101, a plurality of first injection holes 1011 are provided in the first regions, and a plurality of second injection holes 1012 are provided in the second regions.

[0090] In some embodiments, along the length of the pile tube 101, a second region, a first region, a second region, a first region, and a second region are sequentially provided from top to bottom. The first region is provided with a plurality of first injection holes 1011, and the second region is provided with a plurality of second injection holes 1012.

[0091] like Figure 3 As shown, in some embodiments, a plurality of first injection holes 1011 are spirally distributed along the circumference of the pile pipe 101, which can make the plurality of first injection holes 1011 uniformly distributed in both the circumferential and axial directions, thereby improving the uniformity of grouting.

[0092] In some embodiments, the plurality of second injection holes 1012 are spirally distributed along the circumference of the pile pipe 101, so that the plurality of second injection holes 1012 are uniformly distributed in both the circumferential and axial directions, thereby improving the uniformity of grouting.

[0093] In some embodiments, a plurality of first injection holes 1011 in the first region are spirally distributed along the circumference of the pile pipe 101, so that the plurality of first injection holes 1011 are uniformly distributed in both the circumference and axial direction of the first region, thereby improving the uniformity of grouting.

[0094] In some embodiments, a plurality of second injection holes 1012 in the second region are spirally distributed along the circumference of the pile pipe 101, so that the plurality of second injection holes 1012 are uniformly distributed in both the circumference and axial direction of the second region, thereby improving the uniformity of grouting.

[0095] In some embodiments, after the first sealing member 102 leaves the first injection hole 1011, the opening and closing state of the first injection hole 1011 depends on the type of fluid injected through the first injection hole 1011. For example, when the fluid injected through the first injection hole 1011 is a sand-fixing agent, although the sand-fixing agent can be injected outside the pile pipe 101, it will also block the first injection hole 1011, causing the first injection hole 1011 to enter a long-term sealed state after use; of course, if the fluid injected through the first injection hole 1011 is a non-fixing agent such as water, the first injection hole 1011 can remain in a long-term open state after injection, and if necessary, a special sealing agent can be used to seal the first injection hole 1011.

[0096] In some embodiments, after the second sealing member 103 leaves the second injection hole 1012, the opening and closing state of the second injection hole 1012 depends on the type of fluid injected through the second injection hole 1012. For example, when the fluid injected through the second injection hole 1012 is cement-water glass slurry or microbial mineralization slurry, although the cement-water glass slurry or microbial mineralization slurry can be injected outside the pile pipe 101, it will also block the second injection hole 1012, causing the second injection hole 1012 to enter a long-term sealed state after use; of course, if the fluid injected through the second injection hole 1012 is water or other non-fixing agent, the second injection hole 1012 can remain in a long-term open state after injection, and if necessary, a special sealing agent can be used to seal the second injection hole 1012.

[0097] In some embodiments, the first injection port 1011 is configured to remain permanently closed after fluid is injected into the formation through the first injection port 1011. The second injection port 1012 is configured to remain permanently closed after fluid is injected into the formation through the second injection port 1012.

[0098] like Figure 2 As shown, in some embodiments, the pile foundation injection device 10 further includes a third sealing member 104. A third injection hole 1013 is provided on the wall of the pile pipe 101. The third sealing member 104 is sealed in the third injection hole 1013. The third sealing member 104 is configured to break or leave the third injection hole 1013 when the pressure in the pile pipe 101 is greater than or equal to the third pressure, so that the fluid in the pile pipe 101 can be injected into the ground through the third injection hole 1013. The second pressure is less than the third pressure.

[0099] A third sealing element 104 is provided in the third injection hole 1013 on the wall of the pile pipe 101. In the initial state, the third sealing element 104 seals the third injection hole 1013, making the third injection hole 1013 closed, and the fluid in the pile pipe 101 cannot be discharged through the third injection hole 1013. When the pressure in the pile pipe 101 reaches the third pressure (that is, the pressure in the pile pipe 101 is greater than or equal to the third pressure), the third sealing element 104 may break under the action of the third pressure, or it may be directly pushed out by the pressure and leave the third injection hole 1013. Whether it breaks or is pushed out by the pressure, the result is that the third sealing element 104 leaves the third injection hole 1013, making the third injection hole 1013 open. At this time, the fluid in the pile pipe 101 can be discharged through the third injection hole 1013, and the fluid can be injected into the ground after being discharged.

[0100] In the above embodiment, the pile pipe 101 is provided with three types of holes: a first injection hole 1011, a second injection hole 1012, and a third injection hole 1013. These three types of holes are respectively sealed with a first sealing member 102, a second sealing member 103, and a third sealing member 104. Moreover, the first sealing member 102 breaks or leaves the first injection hole 1011 when the pressure in the pile pipe 101 reaches the first pressure; the second sealing member 103 breaks or leaves the second injection hole 1012 when the pressure in the pile pipe 101 reaches the second pressure; and the third sealing member 104 breaks or leaves the third injection hole 1013 when the pressure in the pile pipe 101 reaches the third pressure. The first pressure is less than the second pressure, and the second pressure is less than the third pressure. Therefore, the pile foundation injection device 10 provided in this embodiment can use the different pressure tolerances of the three types of sealing members in the three types of holes to open the three types of injection holes at different times, so as to inject different fluids according to different strata, adapt to more types of strata, and further improve the adaptability of the pile foundation to different strata.

[0101] In some embodiments, the third sealing element 104 is made of a single-layer high-strength brittle material, such as tempered glass or sintered ceramic.

[0102] The pressure is greater when the third sealing component 104 breaks or leaves the third injection hole 1013, making it suitable for ecological water replenishment or nutrient replenishment during operation.

[0103] In some embodiments, the third pressure is 2.2~3.5 MPa, such as 2.5~3.0 MPa. Specifically, it can be 2.2 MPa, 2.3 MPa, 2.4 MPa, 2.5 MPa, 2.6 MPa, 2.7 MPa, 2.8 MPa, 2.9 MPa, 3.0 MPa, 3.1 MPa, 3.2 MPa, 3.3 MPa, 3.4 MPa, 3.5 MPa, etc.

[0104] In some embodiments, the third pressure is at least 0.5 MPa greater than the second pressure to ensure that the third injection port 1013 does not open prematurely.

[0105] In some embodiments, after the third sealing member 104 leaves the third injection hole 1013, the opening and closing state of the third injection hole 1013 depends on the type of fluid injected through the third injection hole 1013. For example, when the fluid injected through the third injection hole 1013 is water, the third injection hole 1013 can remain open for a long period after injection, and water can be continuously replenished into the formation through the third injection hole 1013 at any time. If necessary, a special sealing agent can also be used to seal the third injection hole 1013.

[0106] In some embodiments, the third injection hole 1013 is configured to remain open for an extended period after the third plugging member 104 leaves the third injection hole 1013, so that water can be replenished to the formation through the third injection hole 1013 as needed.

[0107] In some embodiments, there are multiple first injection holes 1011, second injection holes 1012 and third injection holes 1013, and the first injection holes 1011, second injection holes 1012 and third injection holes 1013 are arranged crosswise along the length direction of the pile pipe 101.

[0108] By setting multiple first injection holes 1011, multiple second injection holes 1012, and multiple third injection holes 1013 to be arranged crosswise along the length of the pile tube 101, the first injection holes 1011, the second injection holes 1012, and the third injection holes 1013 can be spaced apart along the length of the pile tube 101. This satisfies the need to inject different fluids at different depths and can also meet the different pressure-bearing capacities of different formations at different depths, further improving the adaptability to different formations.

[0109] In some embodiments, along the length of the pile tube 101, a plurality of first regions, a plurality of second regions and a plurality of third regions are provided at intervals on the pile tube 101. A plurality of first injection holes 1011 are provided in the first regions, a plurality of second injection holes 1012 are provided in the second regions, and a plurality of third injection holes 1013 are provided in the third regions.

[0110] In some embodiments, along the length of the pile tube 101, a third region, a first region, a second region, a third region, a first region, a second region, and a third region are provided sequentially from top to bottom. The first region is provided with a plurality of first injection holes 1011, the second region is provided with a plurality of second injection holes 1012, and the third region is provided with a plurality of third injection holes 1013.

[0111] In some embodiments, the plurality of third injection holes 1013 are spirally distributed along the circumference of the pile pipe 101, which can make the plurality of third injection holes 1013 uniformly distributed in both the circumferential and axial directions, thereby improving the uniformity of grouting.

[0112] In some embodiments, a plurality of third injection holes 1013 in the third region are spirally distributed along the circumference of the pile pipe 101, so that the plurality of third injection holes 1013 are uniformly distributed in both the circumference and axial direction of the third region, thereby improving the uniformity of grouting.

[0113] In some embodiments, the first sealing member 102 is interference-fitted with the first injection hole 1011, the second sealing member 103 is interference-fitted with the second injection hole 1012, and the third sealing member 104 is interference-fitted with the third injection hole 1013.

[0114] By setting the first sealing member 102 and the first injection hole 1011 to an interference fit, the first sealing member 102 can be stably sealed in the first injection hole 1011, preventing the first sealing member 102 from accidentally falling off and causing the first injection hole 1011 to open prematurely, thus affecting the injection position of the fluid.

[0115] By setting the second sealing member 103 and the second injection hole 1012 to an interference fit, the second sealing member 103 can be stably sealed in the second injection hole 1012, preventing the second sealing member 103 from accidentally falling off and causing the second injection hole 1012 to open prematurely, thus affecting the injection position of the fluid.

[0116] By setting the third sealing element 104 and the third injection hole 1013 to an interference fit, the third sealing element 104 can be stably sealed in the third injection hole 1013, preventing the third sealing element 104 from accidentally falling off and causing the third injection hole 1013 to open prematurely, thus affecting the injection position of the fluid.

[0117] It should be noted that before injecting fluid with a preset pressure into the pile tube 101 each time to allow the sealing element to leave the corresponding injection hole, if there is any fluid remaining in the pile tube 101, this fluid can be extracted and the pile tube 101 can be cleaned before injection. This is to prevent this fluid from mixing with the newly injected fluid and affecting the composition of the newly injected fluid; it can also prevent this fluid from affecting the pressure of the newly injected fluid, causing problems such as the corresponding sealing element failing to detach.

[0118] In some embodiments, the pile foundation injection device 10 further includes a barrier 105, which can be inserted into a preset position inside the pile tube 101. The barrier 105 is configured to prevent fluid located above the barrier 105 in the pile tube 101 from entering below the barrier 105, so that the fluid in the pile tube 101 is injected into the ground through a hole on the tube wall located above the barrier 105.

[0119] By setting the barrier 105, the internal space of the pile pipe 101 can be divided into an upper space and a lower space, and the fluid in the upper space can be prevented from entering the lower space, while the fluid in the upper space can be injected into the ground through the injection hole on the pipe wall located above the barrier 105.

[0120] In some embodiments, the insertion position of the barrier 105 is adjustable. That is, the height at which the barrier 105 is inserted into the pile tube 101 is adjustable. The height of the barrier 105 is adjustable along the length of the pile tube 101.

[0121] The advantage of this design is that the insertion position of the barrier 105 can be adjusted according to the injection location, thus meeting the injection needs of different locations.

[0122] For example, when liquid needs to be injected into the pile tube 101 at a depth of 1 / 3 or more from top to bottom, the barrier 105 can be sent to the 1 / 3 depth of the pile tube 101; when liquid needs to be injected into the pile tube 101 at a depth of 2 / 3 or more from top to bottom, the barrier 105 can be sent to the 2 / 3 depth of the pile tube 101, etc.

[0123] When the barrier 105 is inserted into a preset position inside the pile tube 101, the fluid inserted into the pile tube 101 can be nutrient solution or water.

[0124] There are several possible methods for inserting the barrier 105 into the preset position within the pile tube 101. For example, the push rod 109, which will be mentioned later, can be used to insert the barrier 105 into the preset position within the pile tube 101.

[0125] After the pile tube 101 is installed and fixed, if trees or flowers are planted near the pile tube 101, nutrient solution or water can be delivered to the outside of the pile tube 101 through the first injection hole 1011, the second injection hole 1012, or the third injection hole 1013 on the pile tube 101 to irrigate the vegetation and provide it with nutrients or water. At this time, pushing the barrier 105 into the inside of the pile tube 101 can control the delivery position of the nutrient solution or water, preventing the nutrient solution or water delivered into the pile tube 101 from directly reaching the bottom of the pile tube 101 and failing to reach the roots of the vegetation. As the vegetation grows year by year, its root system becomes deeper and deeper. The push rod 109 can continue to push the barrier 105 downwards to deliver the nutrient solution or water to a position closer to the roots of the vegetation.

[0126] After the barrier 105 is inserted into the pile tube 101, it can be placed inside the pile tube 101 for a long time. As the vegetation grows and the roots penetrate deeper, the barrier 105 can be gradually pushed downwards.

[0127] Of course, in some embodiments, hooks or pull ropes can be provided on the barrier 105 so that the barrier 105 can be removed from the pile pipe 101 when not in use.

[0128] There are several options for the specific structure of the barrier 105.

[0129] like Figure 4 and Figure 5 As shown, in some embodiments, the barrier 105 includes a barrier body 1051 and a first sealing ring 1053. The outer periphery of the barrier body 1051 is provided with a first mounting groove 1052, and the first sealing ring 1053 is installed in the first mounting groove 1052.

[0130] By setting a first sealing ring 1053 on the outer periphery of the barrier body 1051, the barrier 105 can make close contact with the pipe wall of the pile pipe 101, thereby achieving a sealing effect of the location of the barrier 105 on the pile pipe 101 and effectively preventing fluid from flowing downward to the barrier 105.

[0131] The first sealing ring 1053 can be made of rubber material. The rubber material is relatively soft, which makes it easy to install the barrier 105 into the pile tube 101 or remove the barrier 105 from the pile tube 101.

[0132] In some embodiments, the pile pipe 101 is a circular pipe, and the barrier 105 is cylindrical.

[0133] In some embodiments, the pile foundation injection device 10 further includes a positioning element 106 and an injection tube 107. The lower part of the pile tube 101 is provided with an outlet hole 1014. One end of the injection tube 107 is connected to the positioning element 106, and the other end of the injection tube 107 extends out from the outlet hole 1014 so that the fluid in the pile tube 101 is injected into the ground through the injection tube 107.

[0134] The positioning element 106 can be used to install and fix the injection tube 107.

[0135] By setting the injection tube 107, the fluid inside the pile tube 101 can be injected to a more distant location through the injection tube 107, which extends from the outlet hole 1014 at the bottom of the pile tube 101 to the outside of the pile tube 101. When the fluid inside the pile tube 101 is a sand-fixing agent, the sand-fixing agent can be injected to a location further away from the pile tube 101 through the injection tube 107, thereby expanding the sand-fixing range and further improving the anchoring capacity of the pile tube 101.

[0136] like Figure 6 As shown, in some embodiments, the positioning element 106 is detachably disposed within the pile tube 101. That is, the positioning element 106 can be installed inside the pile tube 101 or removed from the pile tube 101, so that the positioning element 106 is removed from the pile tube 101.

[0137] By setting the positioning element 106 to be detachably installed inside the pile tube 101, the positioning element 106 can be flexibly installed inside the pile tube 101 as needed, so that the injection tube 107 installed on the positioning element 106 can be used to send the fluid in the pile tube 101 to a farther place, thereby expanding the sand fixation range and improving the anchoring capacity; or, the positioning element 106 can be removed from the pile tube 101 to avoid the positioning element 106 affecting the flow of fluid in the entire pile tube 101, or affecting the installation or removal of other components in the pile tube 101.

[0138] like Figure 7 and Figure 8 As shown, in some embodiments, the injection tube 107 is provided with a plurality of fourth injection holes 1071 arranged at intervals along the length direction of the injection tube 107.

[0139] By setting multiple fourth injection holes 1071 on the injection tube 107, the fluid in the injection tube 107 can be discharged along the length of the injection tube 107, so that the fluid is not only discharged at the outlet at the end of the injection tube 107, but also discharged along the extension direction of the injection tube 107, so that the sand-fixing agent can be discharged along the extension direction of the injection tube 107, allowing the sand-fixing agent to extend and fix the stratum like tree roots, thereby improving the anchoring ability.

[0140] In some embodiments, there are multiple injection tubes 107, which extend radially away from the positioning member 106.

[0141] In some embodiments, the orifice diameter of the injection tube 107 can be 6-8 mm, and the injection tube 107 can be made of a relatively hard material such as stainless steel, so that the injection tube 107 can extend outward through the ejection hole 1014 on the pile tube 101 and extend into the formation.

[0142] In some embodiments, the opening and closing state of the fourth injection hole 1071 on the injection tube 107 depends on the type of fluid injected through the fourth injection hole 1071. For example, when the fluid injected through the fourth injection hole 1071 is a sand-fixing agent, although the sand-fixing agent can be injected outside the pile tube 101, it will also block the fourth injection hole 1071, causing the fourth injection hole 1071 to enter a long-term sealed state after use; of course, if the fluid injected through the fourth injection hole 1071 is a non-fixing agent such as water, the fourth injection hole 1071 can be kept in a long-term open state after injection. If necessary, a special sealing device can also be used to close the fourth injection hole 1071.

[0143] In some embodiments, the fourth injection port 1071 is configured to remain closed for an extended period after fluid is injected into the formation through the fourth injection port 1071.

[0144] like Figure 9 and Figure 10 As shown, in some embodiments, the positioning member 106 has a spherical space inside, and one end of the injection tube 107 includes a spherical connecting part, which is disposed in the spherical space.

[0145] By setting a spherical connector and a spherical space, the spherical connector can be stably wrapped by the spherical space, preventing the spherical connector from coming out of the spherical space and affecting the positioning effect of the injection tube 107 in the positioning member 106; the spherical characteristics can also be used to make the spherical connector rotatable within the spherical space, so that the injection tube 107 can rotate relative to the positioning member 106 when extending in different directions, adapting to the extension of the injection tube 107 at different angles, such as extending outwards.

[0146] In some embodiments, the positioning member 106 includes a first positioning part 1061 and a second positioning part 1062 connected to the first positioning part 1061. The first positioning part 1061 is provided with a first positioning hole 10611, and the second positioning part 1062 is provided with a second positioning hole 10621. The first positioning hole 10611 and the second positioning hole 10621 are joined to form a spherical space.

[0147] In some embodiments, the spherical connector is provided with an inlet that communicates with the internal cavity of the injection tube 107, and the positioning member 106 is provided with a connecting channel that connects the internal cavity of the pile tube 101 and the inlet, so that the liquid in the pile tube 101 can enter the injection tube 107.

[0148] By providing a connecting channel within the positioning element 106, the internal cavity of the pile tube 101 and the internal cavity of the injection tube 107 can be connected, allowing the liquid in the pile tube 101 to enter the injection tube 107 and be ejected from the pile tube 101 through the injection tube 107.

[0149] In some embodiments, the positioning member 106 further includes a sealing member 1063, which is disposed between the first positioning part 1061 and the second positioning part 1062. The sealing member 1063 is provided with a third positioning hole 10631, through which the spherical connecting part of the injection tube 107 passes.

[0150] By setting the sealing element 1063, the sealing effect of the positioning element 106 can be guaranteed, preventing fluid from leaking through the gap between the first positioning part 1061 and the second positioning part 1062.

[0151] like Figures 11 to 14 As shown, in some embodiments, the first positioning part 1061 is provided with a first docking groove 10612, the opening of the first docking groove 10612 facing away from the second positioning part 1062, and the first docking groove 10612 docks with the docking part 1091 on the push rod 109, which will be mentioned later. The first docking groove 10612 is in fluid communication with the first positioning hole 10611, so that fluid in the pile tube 101 can enter the injection tube 107 through the first docking groove 10612 and the first positioning hole 10611.

[0152] It is easy to understand that in some embodiments, the first docking groove 10612, the first positioning hole 10611, the third positioning hole 10631 and the second positioning hole 10621 on the positioning member 106 together form the aforementioned connecting channel to connect the internal cavity of the pile tube 101 and the internal cavity of the injection tube 107.

[0153] In some embodiments, a connecting hole section is further provided between the first docking groove 10612 and the first positioning hole 10611.

[0154] In some embodiments, the positioning member 106 further includes a connector 1064, through which the first positioning part 1061 and the second positioning part 1062 are connected and fixed.

[0155] In some embodiments, the first positioning part 1061 has a plurality of first connecting holes 10615 arranged circumferentially at intervals, the second positioning part 1062 has a plurality of second connecting holes 10622 arranged circumferentially at intervals, and the sealing member 1063 has a plurality of third connecting holes 10632 arranged circumferentially at intervals. The connecting member 1064 passes through the first connecting holes 10615, the third connecting holes 10632, and the second connecting holes 10622 sequentially from top to bottom to connect the first positioning part 1061, the sealing member 1063, and the second positioning part 1062. The connecting member 1064 may be a bolt or nut.

[0156] In some embodiments, the outer periphery of the first positioning part 1061 is provided with an annular second mounting groove 10613, and the second sealing ring 10614 is installed in the second mounting groove 10613.

[0157] By setting the second sealing ring 10614, a sealing effect can be achieved between the first positioning part 1061 and the pipe wall of the pile pipe 101.

[0158] like Figure 15 and Figure 16 As shown, in some embodiments, the second positioning part 1062 is provided with a plurality of second positioning holes 10621 and a plurality of second connecting holes 10622. In the radial direction, the second positioning holes 10621 are located inside the second connecting holes 10622.

[0159] like Figure 17 and Figure 18 As shown, in some embodiments, the seal 1063 is provided with a plurality of third positioning holes 10631 and a plurality of third connecting holes 10632, wherein in the radial direction, the third positioning holes 10631 are located inside the third connecting holes 10632.

[0160] In some embodiments, the pile foundation injection device 10 further includes a guide member 108, which is provided with a guide channel 1081. The injection tube 107 enters the guide channel 1081 from the inlet of the guide channel 1081, and the outlet of the guide channel 1081 is connected to the injection hole 1014.

[0161] By setting a guide member 108 and a guide channel 1081 on the guide member 108, the injection direction of the injection tube 107 can be guided, so that the injection tube 107 can extend out of the pile tube 101 more smoothly.

[0162] In some embodiments, the guide 108 is detachably disposed within the pile tube 101. That is, the guide 108 can be installed inside the pile tube 101 or removed from the pile tube 101, allowing the guide 108 to leave the pile tube 101.

[0163] By configuring the guide 108 to be detachably disposed within the pile tube 101, the guide 108 can be flexibly installed within the pile tube 101 as needed, so as to guide the extension of the injection tube 107 by utilizing the guide channel 1081 provided on the guide 108, thereby improving the smoothness of injection of the injection tube 107; or, the guide 108 can be removed from the pile tube 101 to avoid the guide 108 affecting the flow of fluid throughout the pile tube 101, or affecting the installation or removal of other components within the pile tube 101.

[0164] like Figure 19 As shown, in some embodiments, the guide channel 1081 has a groove-like structure and is open in the extending direction of the guide channel 1081. This open structure can guide the extending direction of the injection tube 107 without obstructing its extension, thus preventing the injection tube 107 from getting stuck in the guide channel 1081 and affecting its extension.

[0165] In some embodiments, the guide member 108 is frustum shaped, the area of ​​the upper end face 1082 of the guide member 108 is smaller than the area of ​​the lower end face 1083, and the guide channel 1081 extends obliquely downward along the side surface 1084 of the guide member 108.

[0166] By setting the guide 108 in the shape of a frustum, a downwardly inclined guide channel 1081 can be set on the inclined side 1084 of the guide 108. The inclined guide channel 1081 can then guide the injection tubes 107 that are gathered together to spread outward. This guiding direction is conducive to pushing the injection tubes 107 outward from the inside of the pile tube 101. After being ejected outward, they can extend radially outward like tree roots.

[0167] like Figure 19 and Figure 20 As shown, the bottom of the guide member 108 is provided with a limiting groove 1085, and the opening of the limiting groove 1085 faces downward.

[0168] like Figure 22 As shown, the bottom of the pile tube 101 is provided with a limiting boss 1015. After the guide member 108 is installed into the pile tube 101, the limiting boss 1015 is embedded in the limiting groove 1085 to keep the guide member 108 and the pile tube 101 relatively fixed in the circumferential direction, thereby ensuring that the outlet of the guide channel 1081 on the guide member 108 can be aligned with the ejection hole 1014 on the pile tube 101.

[0169] In some embodiments, the number of limiting grooves 1085 and limiting bosses 1015 can both be two. The guide 108 and the pile pipe 101 are positioned and limited by the two limiting grooves 1085 and the two limiting bosses 1015, which improves reliability.

[0170] like Figure 21 As shown, the top of the guide 108 is provided with a second docking groove 1086, which docks with the docking part 1091 on the push rod 109, which will be mentioned later.

[0171] In some embodiments, the pile foundation injection device 10 further includes a push rod 109 configured to push the positioning member 106 and the guide member 108 from the upper end of the pile tube 101 to the lower end of the pile tube 101.

[0172] By providing the push rod 109, a tool can be provided to push the positioning member 106 and the guide member 108 from the upper end of the pile tube 101 to the lower end of the pile tube 101. Using the push rod 109, the positioning member 106 and the guide member 108 can be pushed from the upper end of the pile tube 101 to the lower end of the pile tube 101 relatively conveniently.

[0173] like Figure 23 As shown, the push rod 109 includes a push rod body 1092 and a docking portion 1091 disposed at the lower end of the push rod body 1092. The docking portion 1091 can dock with the first docking groove 10612 disposed at the top of the first positioning portion 1061 of the positioning member 106. The docking portion 1091 is embedded in the first docking groove 10612, so that when the push rod 109 is pushed from top to bottom, the positioning member 106 can also be driven to move from top to bottom until the positioning member 106 is pushed to a preset position. The preset position can be the position where the injection tube 107 installed on the positioning member 106 extends out of the pile tube 101, and the position where the gathering plate 110, which will be mentioned later, contacts the guide member 108.

[0174] The docking part 1091 can also dock with the second docking groove 1086 provided on the top of the guide member 108. The docking part 1091 is embedded in the second docking groove 1086, so that when the push rod 109 moves from top to bottom, the guide member 108 can also be driven to move from top to bottom until the guide member 108 is pushed to a preset position. The preset position can be the position where the limiting boss 1015 in the pile pipe 101 enters the limiting groove 1085 on the guide member 108.

[0175] By providing docking grooves on both the positioning member 106 and the guide member 108 that can dock with the docking part 1091 of the push rod 109, the same push rod 109 can simultaneously have the ability to push the positioning member 106 and the guide member 108, achieving the effect of one item serving two purposes. This helps to reduce the total number of parts and also saves costs.

[0176] In some embodiments, the end of the push rod 109 is provided with a docking portion 1091, the top of the positioning member 106 is provided with a first docking groove 10612, and the top of the guide member 108 is provided with a second docking groove 1086. The docking portion 1091 can be inserted into the first docking groove 10612 or the second docking groove 1086. The docking portion 1091, the first docking groove 10612, and the second docking groove 1086 are all configured to prevent the docking portion 1091 from rotating in the first docking groove 10612 or the second docking groove 1086, so as to avoid the push rod 109 from rotating relative to the positioning member 106 or the guide member 108 and affecting the pushing effect.

[0177] The docking part 1091, the first docking groove 10612 and the second docking groove 1086 are all configured as non-rotational matching structures, so that the docking part 1091 cannot rotate relative to the first docking groove 10612 and the second docking groove 1086.

[0178] In some embodiments, the cross-sectional shape of the docking part 1091 can be a polygonal shape such as a triangle, quadrilateral or pentagon, so that the docking part 1091 cannot rotate in the docking groove, thereby preventing the push rod 109 from rotating relative to the positioning member 106 or the guide member 108 and affecting the pushing effect.

[0179] In some embodiments, the push rod 109 further includes a support ring 1093, which is connected between the push rod body 1092 and the docking portion 1091. The diameter of the support ring 1093 is larger than the diameter of the push rod body 1092, and the diameter of the support ring 1093 is slightly smaller than the diameter of the central hole 1010 of the pile tube 101.

[0180] The diameter of the push rod body 1092 is smaller than the diameter of the support ring 1093 and also smaller than the diameter of the central hole 1010 of the pile pipe 101, which can prevent the push rod 109 from getting stuck during the pushing process.

[0181] The diameter of the support ring 1093 is larger than the diameter of the push rod body 1092, and the diameter of the support ring 1093 is slightly smaller than the diameter of the central hole 1010 of the pile tube 101. During the pushing process, the support ring 1093 can keep the push rod 109 and the pile tube 101 coaxial, avoid the push rod 109 from tilting during the pushing process, and thus prevent jamming during the pushing process, which is beneficial to improving the pushing efficiency of the push rod 109.

[0182] In some embodiments, the pile foundation injection device 10 further includes a push rod 109 configured to push the barrier 105 from the upper end of the pile tube 101 to a preset position.

[0183] By pushing the barrier 105 from the top of the pile pipe 101 to the preset position using the push rod 109, the installation difficulty of the barrier 105 can be reduced.

[0184] The top of the barrier 105 can also be provided with a corresponding docking groove so as to dock with the push rod 109.

[0185] In some embodiments, the pile foundation injection device 10 further includes a gathering plate 110, which has a plurality of gathering holes 1101. A plurality of injection tubes 107 are inserted into the plurality of gathering holes 1101. The gathering plate 110 is movably fitted onto the injection tubes 107, so that the plurality of injection tubes 107 are gathered towards the center by the movement of the gathering plate 110 relative to the injection tubes 107. The movement of the gathering plate 110 relative to the injection tubes 107 achieves the central convergence and adaptation of the plurality of injection tubes 107.

[0186] Before inserting the injection tube 107 into the pile tube 101, the gathering plate 110 can be used to gather the multiple injection tubes 107 into a bundle towards the center, reducing the overall diameter of the multiple injection tubes 107, making it easier to insert the multiple injection tubes 107 into the pile tube 101, and also making it easier for the multiple injection tubes 107 to descend into the pile tube 101.

[0187] like Figure 26 and Figure 27 As shown, in some embodiments, the centerline of the convergence hole 1101 is inclined from the inside to the outside in the direction away from the positioning member 106, so that the injection tube 107 passing through the convergence hole 1101 can extend outward to increase the range covered by the injection tube 107 and further increase the anchoring area.

[0188] like Figure 28 As shown, in some embodiments, the pile foundation injection device 10 further includes a first sealing cap 116 for sealing the top of the pile tube 101. The top of the first sealing cap 116 is sealed.

[0189] After the pile pipe 101 is drilled into the ground and anchored, the pile pipe 101 can be sealed with the first sealing cap 116 after the construction period is completed to prevent debris or sand from entering the central hole 1010 of the pile pipe 101.

[0190] like Figure 29 As shown, in some embodiments, the pile foundation injection device 10 further includes a second sealing cap 117, which is used to seal the top of the pile tube 101. The top of the second sealing cap 117 is provided with an injection hole 1171.

[0191] During the grouting process, the pile pipe 101 can be sealed with the second sealing cap 117. At the same time, fluids such as sand-fixing agent can enter the central hole 1010 of the pile pipe 101 through the grouting hole 1171, and then the sand-fixing agent can be injected into the formation through the first injection hole 1011, the second injection hole 1012, the third injection hole 1013 on the pipe wall of the pile pipe 101 or the fourth injection hole 1071 on the injection pipe 107.

[0192] like Figure 30 As shown, in some embodiments, the pile foundation injection device 10 further includes a third sealing cap 118, which is used to seal the top of the pile tube 101. The top of the third sealing cap 118 is provided with a water injection hole 1181.

[0193] When it is necessary to inject water into the formation using the first injection hole 1011, the second injection hole 1012, the third injection hole 1013 on the pile pipe 101 or the fourth injection hole 1071 on the injection tube 107, the pile pipe 101 can be sealed with the third sealing cap 118. At the same time, water can enter the central hole 1010 of the pile pipe 101 through the water injection hole 1181, and then be injected into the formation through the first injection hole 1011, the second injection hole 1012, the third injection hole 1013 on the pipe wall of the pile pipe 101 or the fourth injection hole 1071 on the injection tube 107.

[0194] like Figure 1 and Figure 2 As shown, in some embodiments, the pile foundation injection device 10 further includes a mounting frame 111, a sealing cover, and a driving device. The mounting frame 111 is installed on the top of the pile tube 101. The mounting frame 111 is provided with a connection hole. The sealing cover is sealed and connected to the connection hole. The sealing cover is provided with an injection hole. The injection pipe of the driving device is in fluid communication with the pile tube 101 through the injection hole, so as to inject liquids such as sand-fixing agent, cement slurry, or water into the pile tube 101 through the driving device.

[0195] The mounting frame 111 includes a support plate and multiple stiffening plates. The support plate is a flat plate and is located on the top of the pile pipe 101. The multiple stiffening plates are connected between the support plate and the pile pipe 101.

[0196] The structure and operation of two embodiments of the pile foundation injection device 10 provided in this disclosure are described below: In such Figure 1 In the first embodiment shown, the pile foundation injection device 10 includes a pile pipe 101, a first sealing member 102, a second sealing member 103, a barrier member 105, a positioning member 106, an injection tube 107, a guide member 108, a push rod 109, a gathering plate 110, a mounting frame 111, and a driving device.

[0197] In such Figure 2In Embodiment 2, compared to Embodiment 1, Embodiment 2 has one more component, namely the third sealing component 104. Furthermore, in Embodiment 1, the pile tube 101 has two types of holes, namely the first injection hole 1011 and the second injection hole 1012; while in Embodiment 2, the pile tube 101 has three types of holes, namely the first injection hole 1011, the second injection hole 1012, and the third injection hole 1013. The structures of other components are basically the same.

[0198] In Embodiment 1, the pile tube 101 is provided with a plurality of first injection holes 1011 and a plurality of second injection holes 1012. Each first injection hole 1011 is provided with a first sealing element 102, and each second injection hole 1012 is provided with a second sealing element 103. In a top-to-bottom direction, the pile tube 101 is provided with a second region, a first region, a second region, a first region, and a second region in sequence, wherein the first region is provided with a plurality of spirally distributed first injection holes 1011, and the second region is provided with a plurality of spirally distributed second injection holes 1012.

[0199] In Embodiment 2, the pile pipe 101 is provided with a plurality of first injection holes 1011, a plurality of second injection holes 1012, and a plurality of third injection holes 1013. Each first injection hole 1011 is provided with a first sealing element 102, each second injection hole 1012 is provided with a second sealing element 103, and each third injection hole 1013 is provided with a third sealing element 104. In a top-to-bottom direction, there are three regions: a third region, a first region, a second region, a third region, a first region, a second region, and a third region. The first region is provided with a plurality of spirally distributed first injection holes 1011, the second region is provided with a plurality of spirally distributed second injection holes 1012, and the third region is provided with a plurality of spirally distributed third injection holes 1013.

[0200] The first sealing element 102 can be polyurethane foam. The second sealing element 103 adopts a double-layer composite structure, with the outer layer being a polyvinyl alcohol film and the inner layer being hardened gypsum or sintered ceramic. The third sealing element 104 can be tempered glass or sintered ceramic.

[0201] When it is necessary to replenish water or nutrient solution to different depths underground through the injection hole on the pile pipe 101, the barrier 105 can be installed in the pile pipe 101 at a preset height to control the depth of water or nutrient solution replenishment.

[0202] Before inserting the injection tube 107, the guide 108 can be pushed to the bottom of the pile tube 101 by the push rod 109, and the limiting groove 1085 on the guide 108 can be engaged with the limiting boss 1015 inside the pile tube 101. The guide channel 1081 on the guide 108 is aligned with the injection hole 1014 on the bottom side of the pile tube 101. Then, the injection tube 107 connected to the positioning member 106 is inserted into the pile tube 101 by the push rod 109, and the injection tube 107 first enters the guide channel 1081 on the guide 108, and then exits through the injection hole 1014 on the bottom side of the pile tube 101. Multiple injection tubes 107 extend radially in all directions like an umbrella. After the injection tube 107 is installed in place, the push rod 109 is removed.

[0203] After the pile foundation injection device 10 is assembled, the driving device sends the sand-fixing agent or water into the pile tube 101. According to the injection requirements, the liquid pressure in the pile tube 101 is adjusted to break or remove the first sealing member 102, the second sealing member 103 or the third sealing member 104, so that the liquid is sprayed out through the first injection hole 1011, the second injection hole 1012 or the third injection hole 1013.

[0204] In addition, the liquid can also flow into the injection tube 107 through the connection channel on the positioning member 106, and finally be injected into the ground through the fourth injection hole 1071 on the injection tube 107.

[0205] Based on the aforementioned pile foundation injection device 10, this disclosure also proposes a photovoltaic power station pile foundation system 100, which includes the aforementioned pile foundation injection device 10.

[0206] Based on the aforementioned pile foundation injection device 10, this disclosure also proposes an injection method based on the aforementioned pile foundation injection device 10, comprising: A first liquid is injected into the pile pipe 101 at a pressure greater than or equal to the first pressure and less than the second pressure, causing the first sealing element 102 to break or leave the first injection hole 1011, so that the first liquid can be injected into the ground through the first injection hole 1011; and / or, A second liquid is injected into the pile pipe 101 at a pressure greater than or equal to the second pressure, causing the second sealing element 103 to break or leave the second injection hole 1012, so that the second liquid can be injected into the ground through the second injection hole 1012.

[0207] In the above embodiments, the first liquid includes at least one of a sand-stabilizing agent and a cement-clay slurry. The second liquid includes at least one of clear water, a water-retaining agent, a nutrient solution, a cement-water glass two-component slurry, and a microbial mineralization slurry.

[0208] In some embodiments, the pile foundation injection device 10 further includes a third sealing member 104. A third injection hole 1013 is provided on the wall of the pile tube 101. The third sealing member 104 is sealed in the third injection hole 1013, and is configured to break or leave the third injection hole 1013 when the pressure inside the pile tube 101 is greater than or equal to a third pressure, so that fluid inside the pile tube 101 can be injected into the ground through the third injection hole 1013. The second pressure is less than the third pressure. The pressure at which the second liquid is injected is greater than or equal to the second pressure and less than the third pressure; Injection methods also include: A third liquid is injected into the pile pipe 101 at a pressure greater than or equal to the third pressure, causing the third sealing element 104 to break or leave the third injection hole 1013, so that the third liquid can be injected into the ground through the third injection hole 1013.

[0209] In the above embodiments, the third liquid includes water, a water-based water-retaining agent, or a vegetation nutrient solution.

[0210] In some embodiments, the injection method includes: In the desert sand layer, a sand-fixing agent is injected into the pile pipe 101 at a pressure greater than or equal to the first pressure and less than the second pressure, so that the first sealing member 102 is broken or leaves the first injection hole 1011, so that the sand-fixing agent is injected into the ground through the first injection hole 1011. In the clay layer, cement clay grout is first injected into the pile pipe 101 with a pressure greater than or equal to the first pressure and less than the second pressure, so that the first sealing member 102 is broken or leaves the first injection hole 1011, so that the cement clay grout is injected into the ground through the first injection hole 1011. Then, a cement and water glass double liquid grout or microbial mineralization grout is injected into the pile pipe 101 at a pressure greater than or equal to the second pressure and less than the third pressure, so that the second sealing element 103 is broken or leaves the second injection hole 1012, so that the cement and water glass double liquid grout or microbial mineralization grout is injected into the ground through the second injection hole 1012. In any soil layer, high-pressure water is injected into the pile pipe 101 at a pressure greater than or equal to the third pressure, causing the third sealing element 104 to break or leave the third injection hole 1013, so that the high-pressure water can be injected into the ground through the third injection hole 1013.

[0211] In some embodiments, the injection method includes a differentiated formation grouting process: Desert sand layer working conditions: inject sand-fixing agent with a pressure greater than or equal to the first pressure and less than the second pressure, and open the first injection hole to complete shallow sand-fixing reinforcement; Clay layer conditions: First, inject cement-clay grout in the first pressure zone to complete the reinforcement of the bottom foundation; then inject cement-water glass double-liquid grout or microbial mineralization grout in the second pressure zone to achieve deep and dense reinforcement. General soil conditions: High-pressure water is injected in the third pressure zone to complete the pre-loosening of the strata and the unblocking of pores.

[0212] In some embodiments, in a desert sand layer scenario During construction: pure cement slurry or bio-based sand-fixing agent can be injected at 0.6-0.8 MPa through the first injection hole 1011 on the pile pipe 101 and the fourth injection hole 1071 on the injection pipe 107 to form an umbrella-shaped enlarged head and a radial reinforcement zone.

[0213] During operation: Water can be added directly through the second injection port 1012 at 1.5-2.0 MPa.

[0214] In some embodiments, in the case of cohesive soil layers: During the construction period: cement-clay slurry (cement:clay:water = 1:2:3) can be injected at 0.6-0.8MPa through the first injection hole 1011 on the pile pipe 101 and the fourth injection hole 1071 on the injection pipe 107 for low-pressure impregnation, and left to stand for 30 minutes; then cement-water glass double liquid slurry (cement slurry:water glass = 1:0.3) can be injected through the second injection hole 1012 at 1.5-2.5MPa (increase the pressure in 2-3 stages, and stabilize the pressure for 2 minutes at each stage) for high-pressure fracturing grouting to form a fracturing network.

[0215] During operation: When replenishing water for the first time, the third injection hole 1013 can be opened by applying a high pressure of 2.5-3.0MPa through the water injection port at the top of the pile pipe 101. After that, the third injection hole 1013 is permanently open for replenishing water at normal pressure.

[0216] Note: The pressure range and other parameters mentioned above are preferred values. In practice, they can be adjusted within ±30% based on factors such as formation conditions and the viscosity of the sand-fixing agent, all of which fall within the protection scope of this disclosure. The components of this disclosure can be replaced by other functionally equivalent structures. For example, the third sealing component 104 can be opened by dissolving it in a solvent using a soluble material. These equivalent alternatives still fall within the protection scope of this disclosure.

[0217] This embodiment of the invention utilizes multiple sets of injection holes and sealing structures with different pressure thresholds set in the pile pipe wall. By leveraging the differentiated pressure opening characteristics of different sealing components, it achieves precise grouting at multiple levels, in different times, and in different layers. Compared to traditional single grouting structures, this solution can match different pressures and grouting fluids with different functions according to different geological conditions such as sandy soil, clay, and composite strata. This effectively solves the problems of weak targeting, poor stratum adaptability, and uneven anchoring effect of traditional pile foundation reinforcement, significantly improving the anchoring capacity, anti-slip performance, and overall structural stability of the pile foundation, and greatly enhancing the adaptability and service life of photovoltaic pile foundations in complex desert geology.

[0218] The positive technical effects of the pile foundation injection device 10 in the above embodiments are also applicable to the photovoltaic power station pile foundation system 100 and the injection method, and will not be repeated here.

[0219] In some embodiments, the photovoltaic power plant pile foundation system 100 further includes a pile drilling device 20, which is used to drive the pile pipe 101 into the ground.

[0220] like Figure 31 and Figure 32 As shown, the pile foundation drilling device 20 includes a drill bit 151 and a reaming wing 152. The drill bit 151 is configured to drill into the ground and drive the pile pipe 101 into the ground. The reaming wing 152 is telescopically disposed at the tail of the drill bit 151. The reaming wing 152 has an extended state and a retracted state. In the extended state, the reaming wing 152 extends away from the central axis of the drill bit 151 so that the drilling diameter of the reaming wing 152 is greater than the drilling diameter of the drill bit 151. In the retracted state, the reaming wing 152 retracts towards the central axis of the drill bit 151 so that the drilling diameter of the reaming wing 152 is smaller than the drilling diameter of the drill bit 151.

[0221] In some embodiments, in the deployed state, the drilling diameter of the reamer 152 is greater than the drilling diameter of the drill bit 151, and the pile foundation drilling device 20 uses both the reamer 152 and the drill bit 151 to drill; in the retracted state, the drilling diameter of the reamer 152 is less than the drilling diameter of the drill bit 151, the reamer 152 is in a non-working state, and the pile foundation drilling device 20 uses the drill bit 151 to drill.

[0222] In this embodiment, by installing a retractable reaming wing 152 at the tail of the drill bit 151, the reaming wing 152 can be deployed during drilling to increase the drilling diameter of the pile foundation drilling device 20, avoiding the shrinkage of the borehole diameter due to sand backflow caused by the flow of soft sand layers, which would affect the settlement of the pile pipe 101. When the pile pipe 101 is sent to the preset position and the drill bit 151 needs to be removed, the reaming wing 152 can be retracted to reduce the overall diameter of the pile foundation drilling device 20, reducing the difficulty of removing the reaming wing 152 and drill bit 151 from the pile pipe 101. It can also prevent the reaming wing 152 from interfering with the pile pipe 101 during the removal process, thus avoiding obstruction of the removal of the pile foundation drilling device 20, or causing the reaming wing 152 to rub against the pipe wall of the pile pipe 101, reducing the service life of the reaming wing 152 and the pile pipe 101.

[0223] In addition, after drilling in the clay layer of the desert, if the clay absorbs water, it will expand rapidly, which will cause the diameter of the hole drilled by the drill bit 151 to shrink. In this embodiment of the present disclosure, by setting a retractable hole-expanding wing 152, the hole diameter can be effectively enlarged, leaving room for the hole diameter to shrink due to the expansion of clay. Even if the hole diameter shrinks due to the expansion of clay by absorbing water, the hole diameter can still be guaranteed to be greater than the outer diameter of the pile pipe 101, ensuring that the pile pipe 101 can sink downward with the drill bit 151.

[0224] In this embodiment, by providing a retractable reaming wing 152, conditions can be provided for reducing the drilling diameter of the drill bit 151. That is, after providing the retractable reaming wing 152, the drilling diameter of the drill bit 151 can be smaller than the diameter of the pile pipe 101, as long as the drilling diameter of the reaming wing 152 is greater than the diameter of the pile pipe 101. Reducing the drilling diameter of the drill bit 151 helps to lower the drilling difficulty.

[0225] In some embodiments, the drilling diameter of the drill bit 151 is smaller than the diameter of the pile pipe 101, and when the reaming wing 152 is in the deployed state, the drilling diameter of the reaming wing 152 is larger than the diameter of the pile pipe 101.

[0226] Setting the drilling diameter of drill bit 151 to be smaller than the diameter of pile pipe 101 can reduce the drilling difficulty of drill bit 151.

[0227] Setting the drilling diameter of the reamer 152 to be larger than the diameter of the pile pipe 101 allows for a drilling allowance, preventing the pile pipe 101 from settling due to a reduction in the drilling diameter caused by soil loosening or expansion when the drilling diameter of the reamer 152 and the diameter of the pile pipe 101 are equal.

[0228] There are several ways to specifically implement the expansion wing 152 to have an expanded state and a retracted state.

[0229] like Figure 33 and Figure 34 As shown, in some embodiments, the pile foundation drilling device 20 further includes a connecting piece 153, the lower end of the reaming wing 152 is connected to the edge of the connecting piece 153, the connecting piece 153 has deformability, in the flat state before deformation, the connecting piece 153 drives the reaming wing 152 to retract, so that the reaming wing 152 is in a contracted state; in the bent state after deformation, the connecting piece 153 drives the reaming wing 152 to extend outward, so that the reaming wing 152 is in an unfolded state.

[0230] In the above embodiment, the expansion wing 152 is switched between the deployed and retracted states by the deformation of the connecting piece 153. This method is relatively easy to implement, and the structure is simple and convenient to arrange.

[0231] like Figure 35 As shown, in some embodiments, there are multiple enlargement wings 152, and all multiple enlargement wings 152 are connected to the connecting piece 153.

[0232] In this embodiment, the connecting piece 153 serves both to connect multiple expanding wings 152 and to allow the expanding wings 152 to switch between extended and retracted states through its own deformation. This dual function of the connecting piece 153 effectively reduces the total number of components in the pile foundation drilling device 20, simplifying the structural configuration.

[0233] In some embodiments, a plurality of enlarged aperture wings 152 are evenly spaced along the circumferential direction and connected to the edge of the connecting piece 153.

[0234] like Figure 35 As shown, in some embodiments, the enlarging wing 152 includes a connecting section and an enlarging section. The connecting section is connected to the connecting piece 153, and the enlarging section is connected to the connecting section. The connecting section is trapezoidal in shape, and the short side of the connecting section is connected to the connecting piece 153. The enlarging section is also roughly trapezoidal in shape, and the short side of the enlarging section is connected to the long side of the connecting section. The length of the short side of the enlarging section is greater than the length of the long side of the connecting section.

[0235] In some embodiments, a cutting portion is formed on the outer side of the enlarged section, and the cutting portion is inclined inward from top to bottom.

[0236] There are several ways to make the connecting piece 153 deform.

[0237] like Figure 36 , Figure 37 and Figure 38As shown, in some embodiments, the pile foundation drilling device 20 further includes a drive rod 154. The end of the drive rod 154 is provided with a tapered recess 1541, and the drill bit 151 is provided with a tapered protrusion 1511. The drive rod 154 is configured to drive the edge of the connecting piece 153 to bend and deform downward relative to the center of the connecting piece 153 when the protrusion 1511 enters the recess 1541, so as to drive the lower end of the reaming wing 152 to tilt inward through the edge of the connecting piece 153, thereby causing the upper end of the reaming wing 152 to extend outward, so that the reaming wing 152 enters the unfolded state.

[0238] By setting the drive rod 154, the connecting piece 153 can be driven to deform from a flat state to a bent state, thereby driving the expanding wing 152 to switch from a retracted state to an unfolded state.

[0239] Moreover, the way the drive rod 154 drives the connecting piece 153 to deform is that the drive rod 154 moves downward, causing the protrusion 1511 on the drill bit 151 to enter the recess 1541 at the lower end of the drive rod 154. The connecting piece 153 is deformed by downward pressure. This method fully meets the requirement that the pile foundation drilling device 20 only has vertical movement space, and can make reasonable use of existing conditions to realize the state switching function of the hole-expanding wing 152.

[0240] like Figure 36 and Figure 37 As shown, in some embodiments, the pile foundation drilling device 20 further includes an elastic element 155, which is disposed between the connecting piece 153 and the drill bit 151. The elastic element 155 is configured to assist the connecting piece 153 in restoring from a bent state to a flat state.

[0241] By setting the elastic element 155, the connecting piece 153 can be assisted in returning from a bent state to a flat state, thereby improving the ability of the connecting piece 153 to return from a bent state to a flat state and reducing the probability that the connecting piece 153 cannot return to a flat state.

[0242] like Figure 35 As shown, in some embodiments, the connecting piece 153 includes a connecting piece body 1531 and a mounting portion 1532. The mounting portion 1532 is connected to the side of the connecting piece body 1531 away from the enlarged wing 152, and the elastic member 155 is mounted on the mounting portion 1532.

[0243] By providing the mounting part 1532, the elastic element 155 can be installed and supported, thereby improving the stability and reliability of the elastic element 155 and effectively preventing the elastic element 155 from being misaligned or accidentally detached from its position.

[0244] In some embodiments, the mounting portion 1532 includes a cylindrical section and a snap-fit ​​section. The cylindrical section is connected to the connecting piece body 1531, and the snap-fit ​​section is connected to the cylindrical section. The diameter of the snap-fit ​​section is larger than the diameter of the cylindrical section. The elastic element 155 includes a spring, which is fitted onto the cylindrical section and the snap-fit ​​section. The diameter of the snap-fit ​​section is equal to or greater than the inner diameter of the spring, so as to limit the position of the spring through the snap-fit ​​section and prevent the spring from disengaging from the mounting portion 1532.

[0245] In some embodiments, the connecting piece body 1531 may be a thin sheet structure made of metal.

[0246] like Figure 38 As shown, in some embodiments, the drive rod 154 has a second cavity 1543 at its center, and the drive rod 154 also has a plurality of first through holes 1542 communicating with the second cavity 1543. The plurality of first through holes 1542 are arranged at intervals along the circumference of the drive rod 154.

[0247] like Figure 39 , Figure 40 and Figure 41 As shown, in some embodiments, the drill bit 151 includes a drill bit body 1512 and a drill bit connecting part 1513. The drill bit body 1512 is conical in shape, and a plurality of cutting wings 1514 are provided on the outer periphery of the drill bit body 1512. The drill bit connecting part 1513 is connected to the upper part of the drill bit body 1512 and is connected to the sleeve 1563 on the drive shaft 156, which will be mentioned later.

[0248] The drill bit connection part 1513 has a second external thread on its outer periphery, and the sleeve 1563 has a second internal thread 1566 inside. The drill bit connection part 1513 and the sleeve 1563 are connected by the second external thread and the second internal thread 1566.

[0249] like Figure 40 As shown, in some embodiments, the drill bit connection portion 1513 has a third cavity 1515 inside, a protrusion 1511 is disposed on the top surface of the drill bit body 1512, and the protrusion 1511 is located in the third cavity 1515.

[0250] like Figure 41 As shown, in some embodiments, the top surface of the drill bit body 1512 is provided with a plurality of second through holes 1516, the interior of the drill bit body 1512 is provided with a fourth cavity 1517, and the side surface of the drill bit body 1512 is provided with a plurality of third through holes 1518. The second through holes 1516 connect the third cavity 1515 and the fourth cavity 1517, and the third through holes 1518 connect the fourth cavity 1517.

[0251] Cooling water can be introduced into the second cavity 1543 of the drive rod 154. The cooling water can be discharged from the first through hole 1542 of the drive rod 154. The cooling water discharged from the first through hole 1542 enters the third cavity 1515 inside the drill bit connection part 1513. The cooling water in the third cavity 1515 can enter the third cavity 1515 inside the drill bit body 1512 through the second through hole 1516 on the top surface of the drill bit body 1512, and then be discharged through the third through hole 1518 on the side of the drill bit body 1512, and finally enter the formation. After the cooling water enters the drill bit body 1512, it can cool the drill bit 151, avoiding the heat generated by friction during the drilling process from causing the drill bit 151 to overheat and affecting the life of the drill bit 151.

[0252] In some embodiments, the pile foundation drilling device 20 further includes a drive shaft 156 connected to a drill bit 151, the drive shaft 156 being configured to transmit rotational power to the drill bit 151 so that the drill bit 151 drills into the ground during rotation.

[0253] By setting the drive shaft 156, the rotational power of the power unit can be transmitted to the drill bit 151, thereby driving the drill bit 151 and the reaming blade 152 to rotate, so that the drill bit 151 and the reaming blade 152 drill into the ground during the rotation, thereby causing the pile pipe 101 to sink downward.

[0254] In some embodiments, the center of the drive shaft 156 is provided with a first cavity 1561, and the drive rod 154 is disposed in the first cavity 1561.

[0255] By setting a first cavity 1561 at the center of the drive shaft 156, a space can be provided for the drive rod 154. This space allows the drive rod 154 to move in the vertical direction without affecting the drilling process of the drill bit 151.

[0256] like Figure 42 , Figure 43 and Figure 44 As shown, in some embodiments, the pile foundation drilling device 20 further includes a first screw 157. The outer periphery of the first screw 157 is provided with a first external thread, and the cavity wall of the first cavity 1561 is provided with a first internal thread 1568. The first screw 157 is connected to the drive shaft 156 through the first external thread and the first internal thread 1568. The first screw 157 is located above the drive rod 154 so that by rotating the first screw 157, the drive rod 154 can be driven to move along the axis of the drive shaft 156, thereby driving the connecting piece 153 to deform or enabling the connecting piece 153 to return to its original shape.

[0257] By setting the first screw 157, it can be threadedly engaged with the drive shaft 156. Since the first screw 157 is located above the drive rod 154, by rotating the first screw 157, the first screw 157 can move up and down relative to the drive shaft 156 along its axis, thereby driving the drive rod 154 to move up and down. Furthermore, the drive rod 154 drives the connecting piece 153 to deform or allows the connecting piece 153 to return to its original shape.

[0258] like Figure 44 As shown, in some embodiments, the first screw 157 is provided with a first hole 1571, which communicates with the first cavity 1561 of the drive shaft 156 so that cooling water can enter the first cavity 1561 through the first hole 1571.

[0259] In some embodiments, the first screw 157 is provided with a second hole 1572, and the first screw 157 can be connected to an operating tool through the second hole 1572 so that the first screw 157 can be screwed in by the operating tool.

[0260] There can be two second holes 1572. The first hole 1571 is located at the center of the first screw 157, and the two second holes 1572 are located on both sides of the first hole 1571.

[0261] like Figure 42 and Figure 43 As shown, in some embodiments, the drive shaft 156 includes a drive shaft body 1562 and a drive connection portion 1567 connected to the drive shaft body 1562. A first cavity 1561 is disposed inside the drive shaft body 1562 and inside the drive connection portion 1567, that is, the internal cavity of the drive shaft body 1562 and the internal cavity of the drive connection portion 1567 together form the first cavity 1561. A first internal thread 1568 is provided on the cavity wall of the internal cavity of the drive connection portion 1567, and a first screw 157 is installed in the internal cavity of the drive connection portion 1567. The first screw 157 and the drive connection portion 1567 of the drive shaft 156 are threadedly engaged.

[0262] The first internal thread 1568 has a certain length, so that the first screw 157 can have space to move up and down within the first cavity 1561.

[0263] With the drive shaft 156 stationary, rotating the first screw 157 causes it to move up and down along the axis of the drive shaft 156. When the first screw 157 moves downward, it drives the drive rod 154 located below it to move downward. The downward movement of the drive rod 154 drives the connecting piece 153 to deform from a flat state to a bent state, thus unfolding the expanding wing 152. When the first screw 157 moves upward, the pressure exerted by the first screw 157 on the drive rod 154 gradually disappears. Under the action of the elastic potential energy of the elastic element 155, the connecting piece 153 can overcome the gravity of the drive rod 154 and return from a bent state to a flat state, thereby causing the expanding wing 152 to retract.

[0264] In some embodiments, the outer periphery of the drive connection 1567 is configured as a hexahedron shape to facilitate connection with the rotary drilling and injection machine 112 that drives the drive shaft 156 to rotate, so as to drive the drive shaft 156 and the drill bit 151 connected to the drive shaft 156 to rotate through the rotary drilling and injection machine 112 to achieve the drilling purpose.

[0265] The rotary drilling rig with integrated fluid injection system 112 can drive the drive shaft 156 to rotate and vibrate simultaneously. The drive shaft 156, in turn, drives the drill bit 151 to rotate and vibrate simultaneously, achieving the drilling purpose of the drill bit 151. The rotary drilling rig with integrated fluid injection system 112 can also inject coolant (such as water) into the second cavity 1543 of the drive rod 154. The coolant can be discharged from the first through hole 1542 on the drive rod 154 and then enter the interior of the drill bit 151 to cool it, preventing the heat generated by friction during drilling from causing the drill bit 151 to overheat and affecting its lifespan.

[0266] In some embodiments, the pile foundation drilling device 20 further includes a straightening ring 158 disposed in a first cavity 1561, and a drive rod 154 passing through the straightening ring 158. The straightening ring 158 is configured to keep the drive rod 154 coaxial with the drive shaft 156.

[0267] By setting a centering ring 158 and inserting the drive rod 154 through the centering ring 158, the drive rod 154 can be kept coaxial with the transmission shaft 156, preventing the drive rod 154 from being misaligned and affecting its driving effect on the connecting piece 153.

[0268] like Figure 45 As shown, the center of the straightening ring 158 is provided with a straightening hole 1581, and the drive rod 154 can be inserted into the straightening hole 1581.

[0269] By setting the centering ring 158, the diameter of the drive rod 154 can be set to be smaller, so as to prevent the drive rod 154 from rubbing against the first cavity 1561 of the transmission shaft 156 during the axial movement relative to the transmission shaft 156, which also helps to improve the stability and reliability of the axial movement of the drive rod 154.

[0270] In some embodiments, there are multiple straightening rings 158, which are arranged at axial intervals along the drive shaft 156.

[0271] For example, there can be three straightening rings 158, which are respectively set at the upper, middle and lower positions of the drive rod 154.

[0272] like Figure 46 and Figure 47 As shown, in some embodiments, the pile foundation drilling device 20 further includes a drive shaft 156 connected to a drill bit 151. The drive shaft 156 is configured to transmit rotational power to the drill bit 151 so that the drill bit 151 drills into the ground during rotation. The drive shaft 156 includes a drive shaft body 1562 and a sleeve 1563 connected to the drive shaft body 1562. The sleeve 1563 is connected to the drill bit 151. The sleeve 1563 is provided with a telescopic hole 1564. In the retracted state, the reaming wing 152 is located inside the sleeve 1563; in the extended state, the reaming wing 152 extends out of the sleeve 1563 through the telescopic hole 1564.

[0273] By incorporating the sleeve 1563, the expanding wing 152 can be retracted into the sleeve 1563 in the retracted state, thus protecting the expanding wing 152 and preventing it from colliding with other components when not in operation, which could affect its service life. For example, during the process of inserting the pile foundation drilling device 20 into the pile pipe 101, retracting the expanding wing 152 into the sleeve 1563 can prevent the expanding wing 152 from scratching the pipe wall of the pile pipe 101 and also protect the expanding wing 152 from damage.

[0274] In some embodiments, the sleeve 1563 is cylindrical, and the diameter of the sleeve 1563 is larger than the diameter of the drive shaft body 1562. This arrangement allows the internal space of the sleeve 1563 to be sufficient to accommodate the enlarging wing 152.

[0275] It is understandable that the internal cavity of the sleeve 1563 is also part of the first cavity 1561, which includes the internal cavity of the sleeve 1563, the internal cavity of the drive shaft body 1562, and the internal cavity of the drive connection part 1567.

[0276] like Figure 47 and Figure 48As shown, in some embodiments, the drive shaft 156 further includes a sand deflector 1565 disposed at the telescopic hole 1564. The sand deflector 1565 is configured to allow the expansion wing 152 to pass through and to reduce the entry of wind and sand.

[0277] By setting a sand-blocking plate 1565 at the expansion hole 1564, it is possible to effectively prevent sand and other debris from entering the interior of the sleeve 1563 through the expansion hole 1564, and also to prevent sand and other debris from clogging the expansion hole 1564 and affecting the entry and exit of the expansion wing 152.

[0278] In some embodiments, the sand-blocking plate 1565 is configured such that the width of the telescopic hole 1564 gradually decreases from the inside to the outside. In the direction from the inside of the sleeve 1563 to the outside, the width of the telescopic hole 1564 gradually decreases, meaning the sand-blocking plate 1565 is flared. In the extending direction of the expanding wing 152, the inlet width is greater than the outlet width, thus allowing the expanding wing 152 to extend more smoothly. In the contracting direction of the expanding wing 152, the inlet width is smaller than the outlet width, effectively preventing sand and other debris from entering the interior of the sleeve 1563 and preventing sand and other debris from clogging the telescopic hole 1564.

[0279] In some embodiments, the sand-blocking plate 1565 may be made of a flexible material such as soft plastic, so that the sand-blocking plate 1565 can be slightly deformed during the extension and retraction of the hole-expanding wing 152, so as to avoid the hole-expanding wing 152 being stuck by the sand-blocking plate 1565 and unable to achieve normal extension and retraction.

[0280] like Figure 31 As shown, in some embodiments, the pile foundation drilling device 20 further includes a second screw 159. The outer periphery of the second screw 159 is provided with a third external thread, and the inner cavity wall of the drive connection part 1567 of the drive shaft 156 is provided with a first internal thread 1568. The second screw 159 and the drive connection part 1567 are connected by the third external thread and the first internal thread 1568. The drive connection part 1567 is located above the first screw 157. The second screw 159 is used to lock the first screw 157 to prevent the first screw 157 from accidentally loosening and causing the connecting piece 153 to accidentally return to its original shape.

[0281] By setting the second screw 159, the first screw 157 can be locked to prevent the first screw 157 from coming loose, causing the drive rod 154 to move upward, which in turn causes the connecting piece 153 to accidentally return to its original shape, causing the hole-expanding wing 152 to retract and affecting the drilling work.

[0282] like Figure 49As shown, in some embodiments, the pile foundation drilling device 20 further includes a sealing ring 160. The sealing ring 160 has a fourth through hole 1601 at its center. The diameter of the fourth through hole 1601 is larger than the diameter of the drive shaft body 1562 and smaller than the outer diameter of the pile pipe 101. The diameter of the fourth through hole 1601 is also smaller than the outer diameter of the sleeve 1563, so that the drive shaft body 1562 can pass through the fourth through hole 1601. The sealing ring 160 is then fitted between the pile pipe 101 and the sleeve 1563. The sealing ring 160 provides a sealing function, which can effectively prevent sand and dust from entering or liquid from leaking out.

[0283] In some embodiments, the sealing ring 160 may be made of highly elastic closed-cell foamed silicone material, which has good dustproof and sealing effects.

[0284] like Figure 32 As shown, in some embodiments, the pile foundation drilling device 20 further includes a first bearing 161, a second bearing 162, and a third bearing 163. The first bearing 161, the second bearing 162, and the third bearing 163 are arranged sequentially from bottom to top at the lower, middle, and upper parts of the drive shaft 156, and the first bearing 161, the second bearing 162, and the third bearing 163 are all arranged between the drive shaft 156 and the pile pipe 101, so that the drive shaft 156 can rotate relative to the pile pipe 101, maintaining the stability of the pile pipe 101 during the rotation of the drive shaft 156.

[0285] like Figure 31 and Figure 32 As shown, in some embodiments, the pile foundation drilling device 20 further includes a mounting frame 111 and a rotary drilling and injection machine 112. The mounting frame 111 is mounted on the top of the pile pipe 101, and the rotary drilling and injection machine 112 is mounted on the mounting frame 111.

[0286] The rotary drilling rig with integrated fluid injection 112 can serve as a power device to send the pile pipe 101 into the ground, provide driving force for the rotation of the drill bit 151, and also deliver coolant into the drill bit 151 to cool it.

[0287] In some embodiments, the power transmission unit of the rotary drilling rig 112 can be driven to connect with the drive connection 1567 of the drive shaft 156. The power of the rotary drilling rig 112 is transmitted to the drive shaft 156 through the drive connection 1567. The rotation of the drive shaft 156 can drive the reaming wing 152 and the drill bit 151 to rotate through the sleeve 1563, so as to achieve the drilling purpose through the reaming wing 152 and the drill bit 151 in the deployed state.

[0288] The mounting frame 111 includes a support plate and multiple stiffening plates. The support plate is a flat plate and is located on the top of the pile pipe 101. The multiple stiffening plates are connected between the support plate and the pile pipe 101.

[0289] In some embodiments, the pile foundation drilling device 20 further includes a vibration damping pad 113, which is disposed between the rotary drilling rig 112 and the mounting frame 111. The vibration damping pad 113 is used to buffer the vibration generated by the rotary drilling rig 112 during operation and minimize the vibration force transmitted to the pile pipe 101.

[0290] In some embodiments, the pile foundation drilling device 20 further includes a locking device 114, which is used to connect the rotary drilling rig 112, the vibration damping pad 113 and the mounting frame 111, so that the rotary drilling rig 112 and the vibration damping pad 113 are fixedly installed on the mounting frame 111.

[0291] In some embodiments, the pile foundation drilling device 20 further includes a control device 115, which is signal-connected to the rotary drilling rig 112 and is used to adjust the speed and direction of the rotary drilling rig 112 driving the drill bit 151 to rotate.

[0292] The structure and working process of one embodiment of the pile foundation drilling device provided in this disclosure are described below: like Figure 31 and Figure 32 As shown, the pile foundation drilling device 20 includes a drill bit 151, a reaming wing 152, a connecting piece 153, a drive rod 154, an elastic element 155, a drive shaft 156, a first screw 157, a straightening ring 158, a second screw 159, a sealing ring 160, a first bearing 161, a second bearing 162, a third bearing 163, a mounting frame 111, a rotary drilling and hydration machine 112, a vibration damping pad 113, a locking device 114, and a control device 115. The pile foundation drilling device 20 is used to drive the pile pipe 101 into the ground.

[0293] The drill bit 151 is threadedly connected to the lower sleeve 1563 of the drive shaft 156. Three reaming wings 152 are evenly spaced circumferentially on the connecting piece 153. The bottom of the connecting piece 153 has a mounting part 1532, and an elastic element 155 is mounted on the mounting part 1532. The elastic element 155 abuts against the drill bit 151. The drive rod 154 is installed in the first cavity 1561 of the drive shaft 156, and the recessed part 1541 at the end of the drive rod 154 is engaged with the protrusion 1511 inside the drill bit 151. The first screw 157 and the second screw 159 are threadedly connected to the upper drive connection part 1567 of the drive shaft 156. The first screw 157 abuts against the top of the drive rod 154, and the second screw 159 abuts against the top of the first screw 157. A centering ring 158 is fitted around the upper, middle, and lower outer peripheries of the drive rod 154 to keep the centering ring 158 aligned and coaxial with the drive shaft 156. The pile tube 101 is fitted onto the outside of the drive shaft 156. The drill bit 151 protrudes from the bottom of the pile tube 101. A sealing ring 160 is positioned between the bottom end of the pile tube 101 and the sleeve 1563 of the drive shaft 156. A first bearing 161, a second bearing 162, and a third bearing 163 are installed between the pile tube 101 and the drive shaft 156. A mounting bracket 111 is installed on the top of the pile tube 101, and the rotary drilling rig 112 and the vibration damping pad 113 are fixedly mounted on the mounting bracket 111 via a locking device 114. The power transmission unit of the rotary drilling rig 112 is drivenly connected to the upper drive connection part 1567 of the drive shaft 156. The opening and closing of the rotary drilling rig 112 can be adjusted by the control device 115, and the magnitude of the driving force can also be adjusted.

[0294] After the first screw 157 and the second screw 159 are installed in the inner cavity of the upper drive connection part 1567 of the drive shaft 156, the drive rod 154 moves downward by screwing the first screw 157 and the second screw 159. The drive connecting piece 153 is deformed from a flat state to a bent state, thereby driving the expanding wing 152 to extend out of the telescopic hole 1564 of the sleeve 1563, and the drilling diameter reaches the maximum (for example, the drilling diameter can be 82cm).

[0295] After the pile foundation drilling device 20 is assembled, the rotary drilling and injection machine 112 is started by the control device 115. The rotary drilling and injection machine 112 has both rotary drilling and vibration functions. The rotary drilling and injection machine 112 drives the transmission shaft 156 to rotate and vibrate relative to the pile pipe 101. The transmission shaft 156 drives the reaming wing 152 and the drill bit 151 to rotate. The reaming wing 152 and the drill bit 151 rotate and vibrate at the same time, driving the pile pipe 101 to drill into the ground.

[0296] After the pile pipe 101 is installed in place using the pile drilling device 20, the components of the pile drilling device 20 located inside the pile pipe 101 can be removed, and the mounting frame 111, rotary drilling and liquid injection machine 112, vibration damping pad 113, locking device 114 and control device 115 can be disassembled so that some components of the pile injection device 10 can be inserted into the pile pipe 101; then the mounting frame 111 and the drive device are installed, and liquid is injected into the pile pipe 101 through the drive device; after the injection is completed and the photovoltaic power station pile foundation system 100 is fixed, the photovoltaic power station pile foundation system 100 can be connected to the support structure supporting the photovoltaic modules through the mounting frame 111.

[0297] The pile foundation injection device embodiment provided in this disclosure integrates pressure-graded injection, umbrella-shaped enlarged head anchoring, and precise water replenishment in the root zone. It is applicable to multiple scenarios such as pile foundation anchoring for desert photovoltaic power stations, protection of desert highways, in-depth sand fixation and management, and ecological restoration of cohesive soil layers (Gobi and Loess hills).

[0298] The pile foundation injection device embodiment provided in this disclosure can achieve the temporal separation of sand fixation / reinforcement during construction and water replenishment during operation by setting three types of injection holes with pressure grading on the pile pipe, as well as the adaptation to the strata.

[0299] The pile foundation injection device embodiment provided in this disclosure can effectively improve the pull-out resistance of the pile foundation by setting three types of injection holes on the pile pipe and a fourth injection hole on the injection pipe. The graded design of the sealing component failure pressure in the three types of injection holes on the pile pipe can be applied to both sandy and cohesive soil layers. Moreover, after the sealing component in the injection hole is destroyed, it can be left open for a long time for subsequent ecological watering or nutrient solution replenishment. This replenishment method allows water or nutrient solution to naturally penetrate into the root zone of the vegetation, achieving precise watering of the root zone. Compared with surface irrigation, this can effectively improve water use efficiency and thus improve the survival rate of vegetation.

[0300] By setting sealing components with different pressure levels, the time sequence of sand fixation during construction, deep reinforcement during construction, and ecological intervention during operation can be achieved, and the number, location, and type of injection holes can be flexibly configured according to the strata.

[0301] The pile foundation system embodiment provided in this disclosure simultaneously functions as a support structure, dune anchoring, precise root zone water replenishment, and ecological restoration ring depth adjustment. The pile foundation system, buried underground, can serve for a long period, acting as both a support structure for photovoltaic supports and a channel for sand-fixing agent injection and ecological water replenishment. Furthermore, it employs a minimally invasive construction technique (drilling + vibration integration), allowing for pile foundation installation to be completed by two operators without the need for large machinery, effectively protecting the surface crust. Most construction tools are reusable, effectively reducing overall costs.

[0302] This disclosure addresses various construction defects in drilling through soft sand layers in deserts by incorporating a retractable reamer structure at the drill bit's tail. The reamer's dual-state switching between deployment and retraction effectively solves these problems. During drilling, the reamer expands the borehole diameter, effectively mitigating the shrinkage caused by sand flow and backflow, ensuring a stable borehole diameter and preventing insufficient diameter from affecting the normal lowering and settling of the pile. During drill bit retrieval, the reamer retracts, reducing the overall outer diameter of the device and significantly lowering the resistance of the drill bit and reamer. This effectively avoids interference, scraping, and jamming between components and the inner wall of the pile, reducing construction difficulty, improving efficiency, protecting the structural integrity of the pile and drilling components, and extending equipment lifespan. The pile foundation drilling device provided by this disclosure has a simple structure, reliable operation, and strong adaptability, making it particularly suitable for photovoltaic pile foundation drilling in loose geological formations such as deserts and Gobi.

[0303] In this document, the control device may be a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described herein.

[0304] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0305] Those skilled in the art will understand that, in the methods described in the specific embodiments, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0306] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and not to limit them; although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this disclosure or equivalent substitutions can still be made to some technical features without departing from the principles of this disclosure, and such modifications and equivalent substitutions should all be covered within the scope of the technical solutions claimed in this disclosure.

Claims

1. A pile foundation injection device (10), characterized in that, include: The pile pipe (101) has a first injection hole (1011) and a second injection hole (1012) on its pipe wall. A first sealing element (102) is inserted into the first injection hole (1011), and the first sealing element (102) is configured to break or exit the first injection hole (1011) when the pressure inside the pile tube (101) is greater than or equal to a first pressure, so that fluid inside the pile tube (101) can be injected into the ground through the first injection hole (1011); and The second sealing element (103) is sealed in the second injection hole (1012), and the second sealing element (103) is configured to break or leave the second injection hole (1012) when the pressure in the pile tube (101) is greater than or equal to the second pressure, so that the fluid in the pile tube (101) can be injected into the ground through the second injection hole (1012); Wherein, the first pressure is less than the second pressure.

2. The pile foundation injection device (10) according to claim 1, characterized in that, The pile foundation injection device (10) further includes a third sealing member (104). The pile tube (101) has a third injection hole (1013) on its wall. The third sealing member (104) is sealed in the third injection hole (1013). The third sealing member (104) is configured to break or leave the third injection hole (1013) when the pressure in the pile tube (101) is greater than or equal to the third pressure, so that the fluid in the pile tube (101) can be injected into the ground through the third injection hole (1013). The second pressure is less than the third pressure.

3. The pile foundation injection device (10) according to claim 1, characterized in that, There are multiple first injection holes (1011) and second injection holes (1012), and the first injection holes (1011) and second injection holes (1012) are arranged crosswise along the length direction of the pile pipe (101).

4. The pile foundation injection device (10) according to claim 1, characterized in that, The pile foundation injection device (10) further includes a barrier (105) that can be inserted into a preset position inside the pile tube (101). The barrier (105) is configured to block fluid located above the barrier (105) in the pile tube (101) from entering below the barrier (105), so that the fluid in the pile tube (101) is injected into the ground through a hole on the tube wall located above the barrier (105).

5. The pile foundation injection device (10) according to claim 1, characterized in that, The pile foundation injection device (10) further includes a positioning element (106) and an injection tube (107). The positioning element (106) is disposed inside the pile tube (101). The lower part of the pile tube (101) is provided with an outlet hole (1014). One end of the injection tube (107) is connected to the positioning element (106), and the other end of the injection tube (107) extends out from the outlet hole (1014) so ​​that the fluid in the pile tube (101) is injected into the ground through the injection tube (107).

6. The pile foundation injection device (10) according to claim 5, characterized in that, The injection tube (107) is provided with a plurality of fourth injection holes (1071) arranged at intervals along the length of the injection tube (107).

7. The pile foundation injection device (10) according to claim 5, characterized in that, The positioning component (106) has a spherical space inside, and one end of the injection tube (107) includes a spherical connecting part, which is disposed in the spherical space.

8. The pile foundation injection device (10) according to claim 7, characterized in that, The spherical connector is provided with an inlet, which communicates with the internal cavity of the injection tube (107). The positioning member (106) is provided with a connecting channel, which connects the internal cavity of the pile tube (101) and the inlet, so that the liquid in the pile tube (101) can enter the injection tube (107).

9. The pile foundation injection device (10) according to claim 5, characterized in that, The pile foundation injection device (10) further includes a guide (108), which is disposed inside the pile tube (101). The guide (108) is provided with a guide channel (1081). The injection tube (107) enters the guide channel (1081) from the inlet of the guide channel (1081), and the outlet of the guide channel (1081) is connected to the injection hole (1014).

10. The pile foundation injection device (10) according to claim 9, characterized in that, The guide (108) is in the shape of a frustum. The area of ​​the upper end face (1082) of the guide (108) is smaller than the area of ​​the lower end face (1083). The guide channel (1081) extends downward at an angle along the side (1084) of the guide (108).

11. The pile foundation injection device (10) according to claim 9, characterized in that, The pile foundation injection device (10) further includes a push rod (109) configured to push the positioning element (106), the injection tube (107) and the guide element (108) from the upper end of the pile tube (101) to the lower end of the pile tube (101).

12. The pile foundation injection device (10) according to claim 11, characterized in that, The end of the push rod (109) is provided with a docking part (1091), the top of the positioning member (106) is provided with a first docking groove (10612), and the top of the guide member (108) is provided with a second docking groove (1086). The docking part (1091) can be inserted into the first docking groove (10612) or the second docking groove (1086), and the docking part (1091), the first docking groove (10612) and the second docking groove (1086) are all constructed to make the docking part (1091) unable to rotate in the first docking groove (10612) or the second docking groove (1086).

13. The pile foundation injection device (10) according to claim 5, characterized in that, The pile foundation injection device (10) also includes a gathering plate (110), which has a plurality of gathering holes (1101). There are a plurality of injection tubes (107), which are respectively inserted into the plurality of gathering holes (1101). The gathering plate (110) is movably fitted onto the injection tubes (107) so that the plurality of injection tubes (107) are gathered toward the center by the movement of the gathering plate (110) relative to the injection tubes (107).

14. A photovoltaic power station pile foundation system (100), characterized in that, Includes the pile foundation injection device (10) as described in any one of claims 1 to 13.

15. An injection method based on the pile foundation injection device (10) as described in any one of claims 1 to 13, characterized in that, include: A first liquid is injected into the pile pipe (101) at a pressure greater than or equal to the first pressure and less than the second pressure, causing the first sealing element (102) to break or leave the first injection hole (1011), so that the first liquid is injected into the ground through the first injection hole (1011); and / or, A second liquid is injected into the pile pipe (101) at a pressure greater than or equal to the second pressure, causing the second sealing element (103) to break or leave the second injection hole (1012), so that the second liquid is injected into the ground through the second injection hole (1012).

16. The injection method according to claim 15, characterized in that, The pile foundation injection device (10) further includes a third sealing element (104). A third injection hole (1013) is provided on the wall of the pile pipe (101). The third sealing element (104) is sealed in the third injection hole (1013), and the third sealing element (104) is configured to break or leave the third injection hole (1013) when the pressure inside the pile pipe (101) is greater than or equal to a third pressure, so that fluid inside the pile pipe (101) can be injected into the ground through the third injection hole (1013). The second pressure is less than the third pressure. The pressure at which the second liquid is injected is greater than or equal to the second pressure and less than the third pressure; The injection method further includes: A third liquid is injected into the pile pipe (101) at a pressure greater than or equal to the third pressure, causing the third sealing element (104) to break or leave the third injection hole (1013), so that the third liquid is injected into the ground through the third injection hole (1013).

17. The injection method according to claim 16, characterized in that, The injection method includes: In the desert sand layer, a sand-fixing agent is injected into the pile pipe (101) at a pressure greater than or equal to the first pressure and less than the second pressure, so that the first sealing member (102) breaks or leaves the first injection hole (1011), so that the sand-fixing agent is injected into the ground through the first injection hole (1011); In the clay layer, cement clay slurry is first injected into the pile pipe (101) at a pressure greater than or equal to the first pressure and less than the second pressure, so that the first sealing member (102) breaks or leaves the first injection hole (1011), so that the cement clay slurry is injected into the ground through the first injection hole (1011); Then, a cement and water glass double-liquid grout or microbial mineralization grout is injected into the pile pipe (101) at a pressure greater than or equal to the second pressure and less than the third pressure, so that the second sealing element (103) breaks or leaves the second injection hole (1012), so that the cement and water glass double-liquid grout or microbial mineralization grout is injected into the ground through the second injection hole (1012); In any soil layer, water is injected into the pile pipe (101) at a pressure greater than or equal to the third pressure, causing the third sealing element (104) to break or leave the third injection hole (1013), so that the water is injected into the ground through the third injection hole (1013).

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