Construction equipment and method for micropore cast-in-place pile foundation

Abstract

The invention belongs to the technical field of cast-in-place pile hole forming, and relates to construction equipment and method for a micropore cast-in-place pile foundation. The movable hole-forming drilling machine serves as a bearing platform of whole construction equipment, provides mounting positions for the vibrator, the hollow drill rod and other components, and has a moving function. In the construction process, the valve drill bit crushes a soil body under the vibration effect of the vibrator, and a pile hole is formed. The perpendicularity control system is used for monitoring the perpendicularity of the hollow drill rod in real time and is matched with the movable hole forming drilling machine to adjust the perpendicularity of the hollow drill rod, and it is ensured that the hole forming perpendicularity meets the design requirement. The hollow drill rod serves as a slurry conveying channel, continuous operation of hole forming and pouring is achieved, the conversion time of construction procedures is shortened, and the construction efficiency is improved. And the pressure control system is used for controlling the slurry conveying pumping pressure of the high-pressure pump truck. And the flow control system is used for controlling the slurry conveying pumping flow of the high-pressure pump truck. The hole forming efficiency is improved, and the hole forming quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bored pile hole forming, and relates to a construction equipment and method of a micro-hole bored pile foundation. BACKGROUND

[0002] Solar photovoltaic power generation is one of the main energy forms of new energy. A land solar photovoltaic power generation system mainly comprises a photovoltaic module, a controller, a photovoltaic support and a photovoltaic support foundation, etc. The micro-hole bored pile is one of the main forms of the photovoltaic support foundation.

[0003] At present, the traditional micro-hole bored pile construction follows three procedures of hole forming, steel reinforcement cage (or steel pipe) hoisting and pouring. However, in the procedures of hole forming and steel reinforcement cage (or steel pipe) installation, problems such as hole collapse, necking and excessive thickness of hole bottom sediment often occur. Meanwhile, due to the small hole diameter of the photovoltaic support micro-hole bored pile, the hole cleaning work is difficult, and the hole forming quality often fails to meet the design standard.

[0004] In addition, due to the hole diameter limitation, after the steel reinforcement cage (or steel pipe) is hoisted, the concrete pouring space is limited, the middle and lower part of the concrete is difficult to vibrate, and the pouring vibration is easy to cause the hole wall to collapse, resulting in the hollowing of the concrete pile body or even the pile breaking. Furthermore, the traditional concrete pouring is in a manual mode, the pouring volume is unclear, and it is difficult to accurately calculate the filling coefficient of each pile, so the hole forming quality control is relatively rough.

[0005] Therefore, the quality of the traditional photovoltaic support micro-hole bored pile is not uniform, and a large amount of pile supplement or deepening treatment is often required, thereby causing the investment cost to increase substantially. SUMMARY

[0006] The present application aims to provide a construction equipment and method of a micro-hole bored pile foundation to solve the technical problems in the traditional micro-hole bored pile construction, such as hole collapse, necking, excessive thickness of hole bottom sediment, difficulty in hole cleaning, difficulty in vibrating the middle and lower part of the concrete of the micro-hole bored pile, and unclear pouring volume.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions: The present application discloses a construction equipment of a micro-hole bored pile foundation, comprising: a mobile hole forming drilling machine; a vibrator suspended on the mobile hole forming drilling machine; a conversion joint connected to the output end of the vibrator; a hollow drill rod detachably and fixedly connected to the conversion joint, the hollow drill rod having a communicating inlet end and an outlet end; a perpendicularity control system for real-time monitoring of the perpendicularity of the hollow drill rod; and a flap drill bit fixedly arranged at the outlet end of the hollow drill rod. A high-pressure pump truck has a pumping outlet connected to the inlet end of the hollow drill pipe through a high-pressure slurry conveying pipe; A pressure control system and a flow control system are arranged on the high-pressure pump truck, the pressure control system is used to control the slurry conveying pumping pressure of the high-pressure pump truck, and the flow control system is used to control the slurry conveying pumping flow of the high-pressure pump truck.

[0008] Further, the verticality control system comprises: At least one verticality sensor is installed on the vibrator and is used to detect the verticality of the hollow drill pipe in real time; A data processing module is in communication connection with the verticality sensor, is used to receive the verticality detected by the verticality sensor, and compare the verticality with a preset range; A display module is in communication connection with the data processing module, and is used to display the verticality; An alarm module is in communication connection with the data processing module, and sends an alarm signal when the verticality of the hollow drill pipe exceeds the preset range.

[0009] Further, the pressure control system comprises: A pressure sensor is arranged at the pumping outlet and is used to detect the slurry conveying pumping pressure in real time; A pressure regulating valve is arranged on the slurry conveying pipeline of the high-pressure pump truck and is used to adjust the slurry conveying pumping pressure; A pressure controller is in communication connection with the pressure sensor and the pressure regulating valve respectively, receives the slurry conveying pumping pressure detected by the pressure sensor, compares the slurry conveying pumping pressure with a preset pressure value, and sends a control signal to the pressure regulating valve to adjust the opening degree of the pressure regulating valve when there is a deviation between the detected slurry conveying pumping pressure and the preset pressure value, so as to control the slurry conveying pumping pressure of the high-pressure pump truck to reach the preset pressure value.

[0010] Further, the flow control system comprises: A flow sensor is arranged at the pumping outlet and is used to detect the slurry conveying pumping flow in real time; A flow regulating valve is arranged on the slurry conveying pipeline of the high-pressure pump truck and is used to adjust the slurry conveying pumping flow; A flow controller is connected with the flow sensor and the flow regulating valve respectively, and receives the detected flow of the slurry pump and compares the flow with a preset flow value, and sends a control signal to the flow regulating valve to adjust the opening of the flow regulating valve to control the flow of the slurry pump to reach the preset flow value when the detected flow deviates from the preset flow value.

[0011] Further, the mobile hole-forming drilling machine comprises: A mobile vehicle-mounted mechanism; A horizontal rotating mechanism arranged on the mobile vehicle-mounted mechanism; A telescopic arm assembly arranged on the horizontal rotating mechanism and rotationally connected with the horizontal rotating mechanism, and the vibrator is hung on the telescopic arm assembly; A hydraulic pull rod assembly movably connected with the horizontal rotating mechanism and the telescopic arm assembly respectively; The mobile vehicle-mounted mechanism, the horizontal rotating mechanism, the telescopic arm assembly and the hydraulic pull rod assembly are connected with the verticality control system, and when the verticality control system monitors that the verticality of the hollow drill rod exceeds a preset range, the verticality control system adjusts the verticality of the hollow drill rod through the mobile vehicle-mounted mechanism, the horizontal rotating mechanism, the telescopic arm assembly and the hydraulic pull rod assembly.

[0012] Further, the conversion joint is threadedly connected with the hollow drill rod; The conversion joint is provided with a clamp, which is used for clamping and fixing the hollow drill rod, and after the grouting with the hollow drill rod is completed, the hollow drill rod is disassembled, and the reinforcement cage is clamped and fixed through the clamp; A plurality of bolt holes are formed in the conversion joint, the conversion joint is separated from the vibrator after the concrete is poured, the conversion joint is retained on the reinforcement cage, and the bolt holes are used for installing a solar photovoltaic panel support.

[0013] The application further discloses a construction method of the micro-hole cast-in-place pile foundation based on the construction equipment of the micro-hole cast-in-place pile foundation, and comprises the following steps: The position of the pile hole is determined, and the position of the mobile hole-forming drilling machine is adjusted so that the valve drill bit is aligned with the position of the pile hole; The verticality of the hollow drill rod is monitored in real time through the verticality control system, the vibrator is started to press the valve drill bit into the stratum until the designed depth is reached to form a pile hole, and during the process, if the verticality control system monitors that the verticality of the hollow drill rod exceeds a preset range, the verticality control system alarms; After the pile hole is formed, the high-pressure pump truck pumps concrete into the pile hole through the high-pressure slurry conveying pipe, the hollow drill rod and the valve bit, while the mobile hole-forming drilling machine uniformly lifts the valve bit; When the valve bit is lifted to a set distance below the ground, the lifting of the valve bit is stopped, and after a set time of concrete pumping, the valve bit is lifted to the ground surface, and the concrete pumping is stopped; During the concrete pumping process, the pressure control system is used to real-time control the slurry pumping pressure of the high-pressure pump truck, and the flow control system is used to real-time control the slurry pumping flow of the high-pressure pump truck; After the concrete pouring is completed, the hollow drill rod is disassembled, the reinforcement cage or steel pipe is hung on the conversion joint, the post-insertion reinforcement technology is used to bury the reinforcement cage or steel pipe into the concrete of the pile hole, and the verticality control system is used to monitor the centring and verticality during the insertion of the reinforcement cage or steel pipe; After the reinforcement cage or steel pipe is lowered, the conversion joint is retained on the reinforcement cage, the pile hole is cleaned, the pile top is sealed, and the solar photovoltaic panel support is installed on the conversion joint.

[0014] Further, the pressure control system is used to real-time control the slurry pumping pressure of the high-pressure pump truck, and the slurry pumping pressure ranges from 2 MPa to 4 MPa; The set distance is 0.5 m.

[0015] Further, the mobile hole-forming drilling machine uniformly lifts the valve bit, and during the lifting process, the valve bit is vibrated by a vibrator for 5-10 seconds every 0.5-1.0 m of lifting, and then the lifting of the valve bit is resumed.

[0016] Further, the mobile hole-forming drilling machine includes a mobile vehicle-mounted mechanism, a horizontal rotation mechanism, a telescopic arm assembly and a hydraulic pull rod assembly, the horizontal rotation mechanism is arranged on the mobile vehicle-mounted mechanism, the telescopic arm assembly is arranged on the horizontal rotation mechanism and rotationally connected with the horizontal rotation mechanism, the hydraulic pull rod assembly is movably connected with the horizontal rotation mechanism and the telescopic arm assembly, respectively, and the verticality control system includes at least one verticality sensor, a data processing module and an alarm module, and further includes the following steps: The verticality of the hollow drill rod is real-time acquired by using the verticality sensor; The data processing module is used to compare the acquired perpendicularity with a preset range in real time, if the acquired perpendicularity exceeds the preset range, the mobile vehicle-mounted mechanism is controlled to adjust the position, the horizontal rotating mechanism is controlled to drive the hollow drill rod to rotate horizontally, the height of the hollow drill rod is adjusted by the telescopic arm assembly, the telescopic arm assembly is driven by the hydraulic pull rod assembly to adjust the angle in the vertical plane, until the perpendicularity of the hollow drill rod is less than or equal to the preset range, and the flap drill bit is aligned with the pile hole position. Further comprising: if the acquired perpendicularity exceeds the preset range, the alarm module sends an alarm signal, and when the perpendicularity of the hollow drill rod is less than or equal to the preset range, the alarm module stops sending the alarm signal.

[0017] Compared with the prior art, the present application has the following beneficial effects: The mobile hole-forming drilling machine of the present application serves as a bearing platform of the entire construction equipment, provides installation positions for the vibrator, hollow drill rod and other components, and has a moving function, facilitating operation at different construction positions and improving the flexibility and applicability of the equipment. In the construction process, the vibrator can generate vibration, which helps the valve bit to better break the soil during hole forming, improving the hole forming efficiency. The conversion joint is conducive to the quick disassembly and assembly of the hollow drill rod and the reinforcement cage, and is also used for the installation of the solar photovoltaic panel support. The perpendicularity control system is used for real-time monitoring of the perpendicularity of the hollow drill rod and adjusting the perpendicularity of the hollow drill rod in cooperation with the mobile hole-forming drilling machine, so as to ensure that the hole forming perpendicularity meets the design requirements and improve the pile forming quality of the micro-hole cast-in-place pile. In the hole forming process, the valve bit breaks the soil under the vibration of the vibrator to form a pile hole. The valve structure of the valve bit is closed during drilling to extrude the soil and form a pile hole, and after the hole forming is completed, the valve is opened to facilitate the injection of concrete, which can prevent the hole wall from collapsing and reduce the generation of hole bottom sediment, helping to improve the hole forming quality. After the hole forming is completed, the high-pressure pump truck delivers the concrete slurry into the pile hole at a certain pressure and flow rate. The hollow drill rod serves as a channel for slurry delivery, realizing continuous operation of hole forming and grouting, reducing the conversion time of construction procedures and improving the construction efficiency. The pressure control system is used for controlling the slurry pumping pressure of the high-pressure pump truck, which can ensure the uniform distribution of the concrete slurry in the pile hole, avoid problems such as hole wall rupture caused by excessive pressure or grouting not dense enough caused by insufficient pressure, and improve the strength and stability of the pile. The flow control system is used for controlling the slurry pumping flow rate of the high-pressure pump truck. By accurately controlling the flow rate, the concrete grouting amount of each pile can be accurately calculated, and then the filling coefficient can be accurately calculated to realize fine control of the hole forming quality. Through the cooperative work of various components, the present application effectively solves the problems prone to occur in the construction of traditional micro-hole cast-in-place piles. In the hole forming stage, the vibrator cooperates with the valve bit to improve the hole forming efficiency, ensure the hole forming quality, and reduce the occurrence of phenomena such as hole collapse, necking and excessive thickness of hole bottom sediment; the perpendicularity control system monitors and adjusts the perpendicularity of the hollow drill rod in real time to ensure that the hole forming perpendicularity meets the design requirements. In the grouting stage, the high-pressure pump truck cooperates with the pressure control system and the flow control system to accurately control the pumping pressure and flow rate of the concrete slurry, so that the concrete uniformly and densely fills the pile hole, solves the problem of difficult vibration of the middle and lower part of the concrete, and accurately calculates the filling coefficient to realize fine control of the hole forming quality.

[0018] The verticality control system can monitor the verticality of the hollow drill rod in real time, and can find the verticality deviation in the hole forming process in time, so that the verticality of the hole forming can meet the design requirements. The valve structure of the valve drill bit is closed during drilling, and is used for extruding the soil to form a pile hole. After the hole forming is completed, the valve is opened, the concrete is injected, the hole wall collapse is prevented, the production of the hole bottom sediment is reduced, and the hole forming quality is improved. After the pile hole is formed, the high-pressure pump truck pumps the concrete into the pile hole through the high-pressure slurry conveying pipe, the hollow drill rod and the valve drill bit, and simultaneously, the valve drill bit is uniformly lifted by the mobile hole forming drilling machine. The concrete is uniformly filled in the pile hole at a certain pressure and speed, and problems such as non-dense pouring or local accumulation are avoided. When the valve drill bit is lifted to a set distance below the ground, the lifting of the valve drill bit is stopped, and after a set time of concrete pumping, the concrete in a certain range at the top of the pile hole is more dense, and quality problems such as holes or looseness of the top concrete caused by too fast lifting of the drill bit are avoided. During the concrete pumping process, the slurry pumping pressure of the high-pressure pump truck is adjusted in real time through the pressure control system, so that problems such as hole wall rupture caused by too large pressure or non-dense pouring caused by too small pressure are avoided. The slurry pumping flow of the high-pressure pump truck is adjusted in real time through the flow control system, so that the concrete pouring amount of each pile can be accurately calculated. After the concrete pouring is completed, the conversion joint is connected to the output end of the vibrator, the reinforcement cage or the steel pipe is hung on the conversion joint, and the post-insertion reinforcement technology is used to bury the reinforcement cage or the steel pipe in the concrete in the pile hole. The construction process of the photovoltaic support micro-hole cast-in-place pile is obviously reduced and simplified by adopting the hole forming and pouring combined construction process and combining the post-insertion reinforcement technology, and the construction efficiency is improved. At the same time, the hole forming and pouring combined construction process reduces the disturbance to the hole wall, and eliminates the adverse effects of manual operation in the pouring process. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole structure schematic diagram of an embodiment of the present application; Figure 2 It is a module connection diagram of the verticality control system of an embodiment of the present application; Figure 3 It is a module connection diagram of the pressure control system of an embodiment of the present application; Figure 4 It is a module connection diagram of the flow control system of an embodiment of the present application; Figure 5 It is a working state schematic diagram of the use of the conversion joint to lower the reinforcement cage of an embodiment of the present application; Figure 6 It is a method flowchart of an embodiment of the present application; Figure 7 It is a state diagram of the valve drill bit drilling of an embodiment of the present application; Figure 8 This is a state diagram of concrete pouring through a flap drill bit according to an embodiment of the present invention; Figure 9 This is a diagram showing the state of the reinforcing cage entering the pile hole according to an embodiment of the present invention; Figure 10 This is a diagram showing the state of the reinforcing cage after it enters the pile hole according to an embodiment of the present invention; Figure 11 This is a top view of the adapter clamping the hollow drill pipe according to an embodiment of the present invention; Figure 12 This is a front view of the adapter clamping the hollow drill pipe according to an embodiment of the present invention; Figure 13 This is a top view of the conversion joint clamping the reinforcing cage according to an embodiment of the present invention; Figure 14 This is a front view of the conversion joint clamping the reinforcing cage according to an embodiment of the present invention.

[0020] The components include: 1. Solar photovoltaic panel; 2. Reinforcing cage; 3. Vibrator; 4. Verticality control system; 5. Hollow drill rod; 6. Solar photovoltaic panel bracket; 7. Valve drill bit; 8. Converter joint; 9. Mobile drilling rig; 901. Mobile vehicle-mounted mechanism; 902. Horizontal rotation mechanism; 903. Telescopic boom assembly; 904. Hydraulic tie rod assembly; 10. High-pressure grout delivery pipe; 11. Pressure control system; 12. High-pressure pump truck; 13. Flow control system; 14. Soft soil layer; 15. Hard soil layer; 16. Bearing layer; 17. Clamp; 18. Bolt hole. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first," "second," etc., in the specification and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 This invention discloses a construction equipment for micro-hole cast-in-place pile foundations, including: a vibrator 3, a hollow drill rod 5, a verticality control system 4, a valve drill bit 7, a mobile drilling rig 9, a high-pressure pump truck 12, a pressure control system 11, and a flow control system 13.

[0024] The mobile drilling rig 9 serves as the platform for the entire construction equipment, providing installation positions for components such as the vibrator 3 and the hollow drill rod 5. It also has a mobile function, facilitating operation in different construction locations, improving the flexibility and applicability of the equipment, and reducing the time and cost of equipment handling and reinstallation.

[0025] See Figure 1 In a preferred embodiment of the present invention, the mobile drilling rig 9 includes: a mobile vehicle-mounted mechanism 901, a horizontal rotation mechanism 902, a telescopic arm assembly 903, and a hydraulic tie rod assembly 904.

[0026] The horizontal rotation mechanism 902 is arranged on the mobile vehicle-mounted mechanism 901. The horizontal rotation mechanism 902 can rotate around the rotation center in the horizontal plane, driving the vibrator 3 to rotate.

[0027] The telescopic arm assembly 903 is arranged on and rotatably connected to the horizontal rotation mechanism 902, and the vibrator 3 is suspended on the telescopic arm assembly 903. The telescopic arm assembly 903 has a telescopic function for raising or lowering the vibrator 3.

[0028] The hydraulic tie rod assembly 904 is movably connected to the horizontal rotation mechanism 902 and the telescopic arm assembly 903 respectively. During the extension and retraction of the hydraulic tie rod assembly 904, it can drive the telescopic arm assembly 903 to rotate in the vertical plane around the connection between the telescopic arm assembly 903 and the horizontal rotation mechanism 902.

[0029] The mobile vehicle-mounted mechanism 901, the horizontal rotation mechanism 902, the telescopic arm assembly 903, and the hydraulic tie rod assembly 904 are all connected to the verticality control system 4. When the verticality control system 4 detects that the verticality of the hollow drill rod 5 exceeds the preset range, the verticality control system 4 adjusts the verticality of the hollow drill rod 5 through the mobile vehicle-mounted mechanism 901, the horizontal rotation mechanism 902, the telescopic arm assembly 903, and the hydraulic tie rod assembly 904.

[0030] See Figure 1 The vibrator 3 is suspended on the mobile drilling rig 9 and can generate vibration during construction, which helps the valve drill bit 7 to better break the soil during the drilling process and improve the drilling efficiency.

[0031] See Figure 1 The output end of the vibrator 3 is connected to a conversion connector 8, which facilitates the quick assembly and disassembly of the hollow drill rod and the reinforcing cage, as well as the installation of the solar photovoltaic panel support 6. During the drilling and grouting stages, the conversion connector 8 is used to connect the hollow drill rod 5. See also... Figure 5 After the concrete is poured, the conversion joint 8 is used to connect the reinforcing cage 2 or the steel pipe. Finally, the conversion joint 8 is left on the reinforcing cage 2 for the installation of the solar photovoltaic panel bracket 6.

[0032] See Figure 1 The hollow drill rod 5 is detachably and fixedly connected to the conversion joint 8. The hollow drill rod 5 has a connected inlet end and outlet end. The hollow drill rod 5 serves as a channel for grout transportation. After the hole is formed, concrete grout can be injected into the hole through the hollow drill rod 5, realizing continuous operation of hole forming and grouting, reducing the construction process conversion time and improving construction efficiency.

[0033] In a preferred embodiment of the present invention, the adapter 8 is connected to the hollow drill rod 5 by a thread.

[0034] See Figure 11 In a preferred embodiment of the present invention, the adapter 8 is provided with a clamp 17. See also... Figure 12 The clamp 17 is used to clamp and fix the hollow drill rod 5, further improving the stability of the connection between the adapter 8 and the hollow drill rod 5. After grouting is completed using the hollow drill rod 5, the hollow drill rod 5 is disassembled, and the reinforcing cage 2 is clamped and fixed using the clamp 17. See [link to relevant documentation]. Figure 13 and Figure 14 .

[0035] See Figures 11 to 14In a preferred embodiment of the present invention, the conversion joint 8 is provided with a plurality of bolt holes 18. After the concrete is poured, the conversion joint 8 is separated from the vibrator 3. The conversion joint 8 is retained on the reinforcing cage 2. The bolt holes 18 are used to install the solar photovoltaic panel bracket 6.

[0036] See Figure 1 The verticality control system 4 is used to monitor the verticality of the hollow drill rod 5 in real time. By acquiring verticality data in real time and comparing it with a preset range, an alarm signal can be issued in time when the verticality exceeds the preset range. It can also work with the mobile drilling rig 9 to adjust the verticality of the hollow drill rod 5 to ensure that the hole verticality meets the design requirements, improve the pile quality of micro-hole cast-in-place piles, and avoid problems such as uneven pile stress caused by verticality deviation.

[0037] See Figure 2 In a preferred embodiment of the present invention, the verticality control system 4 includes: at least one verticality sensor, a data processing module, a display module, and an alarm module.

[0038] A verticality sensor is mounted on the vibrator 3 to detect the verticality of the hollow drill rod 5 in real time. The verticality sensor is selected based on its shock resistance, and shock-absorbing components such as rubber damping pads are added between the verticality sensor and the vibrator 3 to reduce the influence of the vibrator 3 on the verticality sensor.

[0039] The data processing module is communicatively connected to the verticality sensor, and is used to receive the verticality detected by the verticality sensor and compare the verticality with a preset range.

[0040] The display module is communicatively connected to the data processing module and is used to display the verticality so that operators can intuitively understand the verticality of the hollow drill rod 5.

[0041] The alarm module is communicatively connected to the data processing module. When the verticality of the hollow drill rod 5 exceeds the preset range, the alarm module issues an alarm signal to remind the operator to adjust the verticality of the hollow drill rod 5 in a timely manner.

[0042] See Figure 1 The hinged drill bit 7 is fixed at the outlet end of the hollow drill rod 5. During the drilling process, the hinged drill bit 7 breaks the soil under the vibration of the vibrator 3 to form a pile hole. See also Figure 7 The flap structure of the flap drill bit 7 closes during drilling to compress the soil and form a pile hole. See also Figure 8 After the hole is formed, the flap opens to facilitate concrete injection, which can prevent the hole wall from collapsing, reduce the generation of sediment at the bottom of the hole, and help improve the quality of hole formation.

[0043] SeeFigure 1 The high-pressure pump truck 12 has a pumping outlet, which is connected to the inlet end of the hollow drill rod 5 via a high-pressure grouting pipe 10, delivering concrete grout into the pile hole at a certain pressure and flow rate. The pumping capacity of the high-pressure pump truck 12 ensures that the concrete grout can smoothly fill the pile hole, improving grouting efficiency. At the same time, its pressure and flow rate are adjustable, allowing for flexible adjustments according to different geological conditions and construction requirements, ensuring grouting quality.

[0044] The pressure control system 11 and the flow control system 13 are arranged on the high-pressure pump truck 12. The pressure control system 11 is used to control the grouting pumping pressure of the high-pressure pump truck 12, which can ensure the uniform distribution of concrete grout in the pile hole, avoid problems such as hole wall rupture due to excessive pressure or insufficient grouting due to insufficient pressure, and improve the strength and stability of the pile body.

[0045] See Figure 3 In a preferred embodiment of the present invention, the pressure control system 11 includes: a pressure sensor, a pressure regulating valve, and a pressure controller.

[0046] A pressure sensor is located at the pump outlet to detect the slurry pumping pressure in real time.

[0047] The pressure regulating valve is installed on the slurry delivery pipeline of the high-pressure pump truck 12 to regulate the slurry pumping pressure.

[0048] The pressure controller is communicatively connected to the pressure sensor and the pressure regulating valve. The pressure controller receives the slurry pumping pressure detected by the pressure sensor and compares the slurry pumping pressure with a preset pressure value. When there is a deviation between the detected slurry pumping pressure and the preset pressure value, the pressure controller sends a control signal to the pressure regulating valve to adjust the opening of the pressure regulating valve so as to control the slurry pumping pressure of the high-pressure pump truck 12 to reach the preset pressure value.

[0049] The flow control system 13 is used to control the grout pumping flow rate of the high-pressure pump truck 12. By precisely controlling the flow rate, the concrete injection volume of each pile can be accurately calculated, thereby accurately calculating the filling coefficient and achieving precise control over the quality of the borehole.

[0050] See Figure 4 In a preferred embodiment of the present invention, the flow control system 13 includes: a flow sensor, a flow regulating valve, and a flow controller.

[0051] A flow sensor is positioned at the pump outlet to detect the slurry pump flow rate in real time.

[0052] A flow regulating valve is installed on the slurry delivery pipeline of the high-pressure pump truck 12 to regulate the slurry pumping flow rate.

[0053] The flow controller is communicatively connected to the flow sensor and the flow regulating valve. The flow controller receives the slurry pumping flow detected by the flow sensor and compares the slurry pumping flow with a preset flow value. When there is a deviation between the detected slurry pumping flow and the preset flow value, the flow controller sends a control signal to the flow regulating valve to adjust the opening of the flow regulating valve so as to control the slurry pumping flow of the high-pressure pump truck 12 to reach the preset flow value.

[0054] This invention effectively solves the problems that easily occur in the construction of traditional micro-hole cast-in-place piles through the coordinated work of its components. During the hole-forming stage, the vibrator 3 works in conjunction with the hinged drill bit 7 to improve hole-forming efficiency, ensure hole quality, and reduce phenomena such as hole collapse, necking, and excessive sediment buildup at the bottom of the hole. The verticality control system 4 monitors and adjusts the verticality of the hollow drill rod 5 in real time to ensure that the verticality of the hole meets design requirements. During the grouting stage, the high-pressure pump truck 12, in conjunction with the pressure control system 11 and the flow control system 13, can precisely control the pumping pressure and flow rate of the concrete slurry, ensuring that the concrete fills the pile hole uniformly and densely, solving the problem of difficulty in vibrating the lower and middle parts of the concrete. Simultaneously, it accurately calculates the filling coefficient, achieving precise control over the hole-forming quality. Overall, the construction equipment of this invention improves the pile quality of micro-hole cast-in-place piles, reduces subsequent work such as pile reinforcement or deepening treatment, lowers investment costs, and has high construction efficiency and quality reliability.

[0055] See Figure 6 This invention discloses a construction method for micro-hole cast-in-place pile foundations, based on construction equipment for micro-hole cast-in-place pile foundations, comprising the following steps: S1. Determine the location of the pile hole and adjust the position of the mobile drilling machine 9 so that the valve drill bit 7 is aligned with the location of the pile hole.

[0056] S2, see S2. Figure 7 The verticality control system 4 monitors the verticality of the hollow drill rod 5 in real time, enabling timely detection of verticality deviations during the drilling process and ensuring that the verticality of the drilled hole meets design requirements. The vibrator 3 is activated to press the valve drill bit 7 into the ground until the designed depth is reached, forming a pile hole. During this process, if the verticality control system 4 detects that the verticality of the hollow drill rod 5 exceeds a preset range, an alarm is triggered. The valve structure of the valve drill bit 7 closes during drilling to compress the soil and form the pile hole. After drilling is completed, the valve opens to facilitate concrete injection, prevent hole wall collapse, reduce sediment generation at the bottom of the hole, and contribute to improving the quality of the drilled hole.

[0057] In a preferred embodiment of the present invention, the mobile drilling rig 9 includes a mobile vehicle-mounted mechanism 901, a horizontal rotation mechanism 902, a telescopic arm assembly 903, and a hydraulic tie rod assembly 904. The horizontal rotation mechanism 902 is arranged on the mobile vehicle-mounted mechanism 901, the telescopic arm assembly 903 is arranged on the horizontal rotation mechanism 902 and rotatably connected to the horizontal rotation mechanism 902, and the hydraulic tie rod assembly 904 is movably connected to the horizontal rotation mechanism 902 and the telescopic arm assembly 903 respectively. The verticality control system 4 includes at least one verticality sensor, a data processing module, and an alarm module, and further includes the following steps: The verticality of the hollow drill rod 5 is obtained in real time using the verticality sensor.

[0058] The data processing module compares the acquired verticality with a preset range in real time. If the acquired verticality exceeds the preset range, the mobile vehicle-mounted mechanism 901 is controlled to adjust its position, the horizontal rotation mechanism 902 is controlled to drive the hollow drill rod 5 to rotate horizontally, the telescopic arm assembly 903 is controlled to adjust the height of the hollow drill rod 5, and the hydraulic tie rod assembly 904 drives the telescopic arm assembly 903 to adjust its angle in the vertical plane until the verticality of the hollow drill rod 5 is less than or equal to the preset range, and the valve drill bit 7 is aligned with the pile hole position.

[0059] In a preferred embodiment of the present invention, the method further includes: if the obtained verticality exceeds a preset range, the alarm module issues an alarm signal; and when the verticality of the hollow drill rod 5 is less than or equal to the preset range, the alarm module stops issuing alarm signals.

[0060] S3, see S3. Figure 8 After the pile hole is formed, the high-pressure pump truck 12 pumps concrete into the pile hole through the high-pressure grouting pipe 10, the hollow drill rod 5, and the valve drill bit 7. Simultaneously, the mobile drilling rig 9 uniformly lifts the valve drill bit 7 at a speed ranging from 1 m / min to 2 m / min. This ensures that the concrete fills the pile hole evenly with a certain pressure and speed, avoiding problems such as incomplete filling or localized accumulation.

[0061] In a preferred embodiment of the present invention, during the lifting process, the valve drill bit 7 is vibrated for 5s to 10s by the vibrator 3 every 0.5m to 1.0m of lifting before the lifting of the valve drill bit 7 begins again.

[0062] S4, when the valve drill bit 7 is raised to a set distance below the ground, the raising of the valve drill bit 7 is stopped. After the concrete pumping is maintained for a set time, the valve drill bit 7 is raised to the ground surface and the concrete pumping is turned off. This ensures that the concrete in a certain range at the top of the pile hole is more compact and avoids quality problems such as voids or looseness in the top concrete caused by the drill bit being raised too quickly.

[0063] In a preferred embodiment of the present invention, the set distance is 0.5m.

[0064] S5, during the concrete pumping process, the pressure control system 11 adjusts the grouting pumping pressure of the high-pressure pump truck 12 in real time. The grouting pumping pressure ranges from 2MPa to 4MPa to avoid problems such as borehole wall rupture due to excessive pressure or insufficient grouting due to insufficient pressure. The flow control system 13 adjusts the grouting pumping flow rate of the high-pressure pump truck 12 in real time, allowing for accurate calculation of the concrete pouring volume for each pile, and thus precise calculation of the filling coefficient. This enables precise control over the borehole quality, ensuring that the strength and stability of the pile body meet design requirements.

[0065] S6, see S6. Figure 5 , Figure 9 and Figure 10 After the concrete pouring is completed, the hollow drill rod 5 is disassembled, and the reinforcing cage 2 or steel pipe is suspended on the conversion joint 8. The reinforcing cage 2 or steel pipe is then embedded into the concrete of the pile hole using a post-insertion reinforcement technique. A verticality control system 4 monitors the alignment and verticality of the reinforcing cage 2 or steel pipe during insertion. This integrated drilling and pouring construction process, combined with post-insertion reinforcement technology, significantly reduces and simplifies the construction procedures for photovoltaic support micro-hole cast-in-place piles, improving construction efficiency. Furthermore, combining drilling and pouring into one process reduces disturbance to the borehole wall and eliminates the adverse effects of manual labor during pouring.

[0066] S7. After the steel cage 2 or steel pipe is lowered, the conversion joint 8 is left on the steel cage 2, the pile hole is cleaned, the pile top is sealed, and the solar photovoltaic panel bracket 6 is installed on the conversion joint 8.

[0067] This invention, through the coordinated operation of the above steps, effectively solves problems commonly encountered in traditional micro-hole cast-in-place pile construction, such as hole collapse, necking, excessive sediment at the bottom of the hole, difficulty in vibrating the concrete in the middle and lower parts, and unclear pouring volume. From precise verticality control during hole formation to fine-tuning of pressure and flow rate during concrete pouring, and the rational application of post-insertion reinforcement technology, each step works in close coordination to ensure the quality of micro-hole cast-in-place piles, while optimizing the process and improving construction efficiency. This invention significantly improves the strength, stability, and bearing capacity of the pile, reduces subsequent work such as pile reinforcement or deepening, lowers investment costs, and improves construction efficiency, providing reliable technical support for solar photovoltaic support foundations.

[0068] Example 2: See Figure 6 To address common quality issues in the formation of micro-hole cast-in-place piles for photovoltaic (PV) systems, such as hole collapse, necking, and excessive sediment buildup, as well as to resolve issues like hollow areas and pile breakage during concrete pouring, and to improve the monitoring of hole formation quality, this invention discloses a construction method for foundation micro-hole cast-in-place piles. This method aims to solve the quality problems existing in traditional micro-hole cast-in-place piles for PV systems in solar power plants, and includes the following steps: S10, Measure the pile position, determine the pile hole location, and put the equipment in place. The equipment includes a mobile drilling rig 9 and a high-pressure pump truck 12.

[0069] S20, adjust the position of the mobile drilling rig 9, control the verticality of the hollow drill rod 5 and the valve drill bit 7 through the verticality control system 4, start the vibrator 3 to press the valve drill bit 7 into the formation, and continuously adjust the verticality of the valve drill bit 7 through the verticality control system 4 until the valve drill bit 7 reaches the design depth to form a pile hole.

[0070] S30. After the valve drill bit 7 reaches the designed depth, it starts pumping concrete. The concrete is pumped through the high-pressure grouting pipe 10, the hollow drill rod 5 and the drill bit valve of the valve drill bit 7. The pumping pressure opens the drill bit valve and the drill is lifted at the same time. The pressure control system 11 is used to maintain the pumping pressure at 2MPa~4MPa and the lifting speed of the hollow drill rod 5 is controlled at 1m / min~2m / min.

[0071] S40, when the valve drill bit 7 is raised to 0.5m below the ground, stop raising the drill bit and continue pumping until the concrete flowing out of the ground is fresh and free of impurities. Then, raise the drill bit to the ground and stop pumping. When pumping concrete, monitor the concrete pouring volume through the flow control system 13 until pumping ends, and record the pouring volume of each micro-hole cast-in-place pile.

[0072] S50, the welded steel cage 2 or steel pipe is embedded into the pile hole concrete using the post-insertion technique, and the verticality control system 4 is used to monitor the centering and verticality of the steel cage 2 or steel pipe during the insertion process. S60. After the steel cage 2 or steel pipe is lowered, clean the hole opening, seal the top of the pile, and move the pile driver to the next hole according to the construction sequence. Repeat steps S20 to S60 until the construction process of all micro-hole cast-in-place piles is completed.

[0073] This invention employs a mobile drilling rig 9 and a concrete pouring system. Compared with the mobile drilling rig 9, mixer, and a large amount of manual operation required in traditional construction processes, it significantly simplifies the construction process, makes the construction environment cleaner and more efficient, greatly reduces manual operation links, achieves a high degree of intensive and information-based management and control, and performs excellently in terms of safety assurance, providing reliable quality assurance for the construction process.

[0074] This invention employs a combined drilling and grouting construction process, combined with post-insertion reinforcement technology, significantly reducing and simplifying the construction procedures for photovoltaic support micro-hole cast-in-place piles, thus improving construction efficiency. Simultaneously, the combined drilling and grouting process minimizes disturbance to the borehole wall and eliminates the adverse effects of manual labor during grouting. Furthermore, the verticality of the borehole, the concrete grouting volume, and the vertical alignment of the reinforcing cage 2 are effectively controlled through the verticality control system 4, pressure control system 11, and flow control system 13, thereby effectively controlling the quality of drilling and pile formation.

[0075] The construction method of this invention eliminates secondary pouring, saves on foundation formwork, anchor bolts, grouting materials and manual secondary treatment, simplifies the process, saves construction time, reduces the overall cost of a single pile, and improves quality assurance; at the same time, the column and the pile body steel cage are anchored as a whole, which improves the pull-out resistance, shear resistance and seismic resistance, and greatly improves its engineering applicability.

[0076] Furthermore, this invention employs static pressure compaction and vibration compaction to form holes. By squeezing the soil outwards to form holes, it is a non-soil-extraction process. During the hole-forming process, the soil around the pile and at the pile bottom is compacted, which improves the engineering performance of the soil around the pile and further enhances the bearing capacity of the micro-hole cast-in-place pile.

[0077] The concrete grouting of the micro-hole cast-in-place pile of this invention adopts pump-pressure grouting, which maintains stable pressure during the grouting process to prevent necking of the pile hole. At the same time, controlling the lifting speed can also effectively reduce the hollow phenomenon in the pile concrete. The verticality control system 4, pressure control system 11 and flow control system 13 are adopted to effectively monitor and control the verticality and filling coefficient during the pile formation process, further improving the integrity and bearing capacity of the pile body, and effectively avoiding quality problems such as hollowness and pile breakage.

[0078] This invention solves the problems of hole collapse, necking, hollowing, pile breakage, and excessive sediment at the bottom of the hole that often occur in traditional construction processes through a series of comprehensive guarantee measures, and the quality of hole formation and pile formation is significantly and beneficially improved.

[0079] Example 3: See Figure 1 The solar photovoltaic power generation system consists of solar photovoltaic panels 1, solar photovoltaic panel supports 6, and solar photovoltaic support foundations.

[0080] Reference Figure 6 This invention discloses a construction method for foundation micro-hole cast-in-place piles, comprising the following steps: S10, first level the site, remove surface debris, and perform simple compaction of the soft soil layer 14 to ensure that the bearing capacity of the working face of the mobile drilling rig 9 meets the requirements. Then, use pile location marking to determine the location of the pile hole and place the equipment.

[0081] S20, adjust the positions of the mobile drilling rig 9 and the high-pressure pump truck 12, adjust the verticality of the valve drill bit 7 through the verticality control system 4, and start the vibrator 3 to press the valve drill bit 7 to the designed depth. See below. Figure 7 In this embodiment, the flap drill bit 7 passes through the soft soil layer 14, the hard soil layer 15 and the bearing layer 16 in sequence to reach the designed depth. During the drilling process, the verticality of the flap drill bit 7 is continuously monitored and adjusted by the verticality control system 4 until the pile hole is formed.

[0082] After the valve drill bit 7 reaches the designed depth, the high-pressure pump truck 12 begins pumping concrete through the high-pressure grouting pipe 10. The pumping pressure opens the valve of the valve drill bit 7, simultaneously lifting it. The pumping pressure is controlled by the pressure control system 11, maintaining it at 2MPa~4MPa. The lifting speed of the hollow drill rod 5 should be controlled at 1m / min~2m / min in hard soil layer 15 and at 0.6m / min~0.8m / min in soft soil layer 14. The flow control system 13 monitors the flow rate changes and the amount of concrete poured into each pile in real time during the concrete pumping process to ensure that the amount of concrete poured meets the theoretical design requirements. During the concrete pumping process, every 0.5m~1.0m of lifting, the vibrator 3 vibrates for 5s~10s before lifting the hollow drill rod 5 again. This process is repeated until the hollow drill rod 5 is completely pulled out, and the intermittent vibration ensures the compactness of the concrete.

[0083] S40, when the valve drill bit 7 is raised to 0.5m below the ground, stop raising the valve drill bit 7 and continue pumping concrete until the concrete flowing out of the ground is fresh and free of impurities. Vibrate for 5s~10s and then raise the valve drill bit 7 to the ground surface and turn off the pump.

[0084] S50, close and disassemble the valve drill bit 7, connect the welded steel cage 2 to the vibrator 3 and the verticality control system 4 through the conversion joint 8, and use the rear insertion technique to embed the steel cage 2 into the pile hole concrete; when lifting, the lifting points of the steel cage 2 should be reasonably arranged, and the bottom of the steel cage 2 should be manually lifted while the head of the steel cage 2 is lifted; if the sinking resistance is too great when the steel cage 2 is lowered, the steel cage 2 should be pulled out in time, and the hole should be re-drilled and inserted. When the steel cage 2 sinks until it is less than 1m above the ground, the end can be vibrated and pressed in with the vibrator 3.

[0085] S60, clean the borehole opening, seal the top of the pile, and move the mobile drilling rig 9 to the next hole position according to the construction sequence. Repeat steps S20 to S60 until the construction process of all micro-hole cast-in-place piles is completed.

[0086] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of this invention.

Claims

1. Construction equipment for micro-hole cast-in-place pile foundations, characterized in that, include: Mobile drilling rig (9); The vibrator (3) is suspended on the mobile drilling rig (9); The adapter (8) is connected to the output end of the vibrator (3); Hollow drill rod (5) is detachably and fixedly connected to the conversion joint (8), and the hollow drill rod (5) has a connected inlet end and an outlet end; A verticality control system (4) is used to monitor the verticality of the hollow drill rod (5) in real time; A flap drill bit (7) is fixed at the outlet end of the hollow drill rod (5); The high-pressure pump truck (12) has a pumping outlet, which is connected to the inlet end of the hollow drill rod (5) via a high-pressure grouting pipe (10); A pressure control system (11) and a flow control system (13) are arranged on the high-pressure pump truck (12). The pressure control system (11) is used to control the slurry pumping pressure of the high-pressure pump truck (12), and the flow control system (13) is used to control the slurry pumping flow of the high-pressure pump truck (12).

2. The construction equipment for micro-hole cast-in-place pile foundations according to claim 1, characterized in that, The verticality control system (4) includes: At least one verticality sensor is installed on the vibrator (3) for real-time detection of the verticality of the hollow drill rod (5); The data processing module is communicatively connected to the verticality sensor and is used to receive the verticality detected by the verticality sensor and compare the verticality with a preset range. The display module is communicatively connected to the data processing module and is used to display the verticality. The alarm module is connected in communication with the data processing module. When the verticality of the hollow drill rod (5) exceeds the preset range, the alarm module issues an alarm signal.

3. The construction equipment for micro-hole cast-in-place pile foundations according to claim 1, characterized in that, The pressure control system (11) includes: A pressure sensor is located at the pump outlet to detect the slurry pumping pressure in real time. A pressure regulating valve is installed on the slurry delivery pipeline of the high-pressure pump truck (12) to regulate the slurry pumping pressure; The pressure controller is communicatively connected to the pressure sensor and the pressure regulating valve respectively. The pressure controller receives the slurry pumping pressure detected by the pressure sensor and compares the slurry pumping pressure with a preset pressure value. When there is a deviation between the detected slurry pumping pressure and the preset pressure value, the pressure controller sends a control signal to the pressure regulating valve to adjust the opening of the pressure regulating valve so as to control the slurry pumping pressure of the high-pressure pump truck (12) to reach the preset pressure value.

4. The construction equipment for micro-hole cast-in-place pile foundations according to claim 1, characterized in that, The flow control system (13) includes: A flow sensor is arranged at the pump outlet to detect the slurry pump flow rate in real time; A flow regulating valve is installed on the slurry delivery pipeline of the high-pressure pump truck (12) to regulate the slurry pumping flow rate; The flow controller is communicatively connected to the flow sensor and the flow regulating valve respectively. The flow controller receives the slurry pumping flow detected by the flow sensor and compares the slurry pumping flow with a preset flow value. When there is a deviation between the detected slurry pumping flow and the preset flow value, the flow controller sends a control signal to the flow regulating valve to adjust the opening of the flow regulating valve so as to control the slurry pumping flow of the high-pressure pump truck (12) to reach the preset flow value.

5. The construction equipment for micro-hole cast-in-place pile foundations according to claim 1, characterized in that, The mobile drilling rig (9) includes: Mobile vehicle-mounted mechanism (901); A horizontal rotation mechanism (902) is arranged on the mobile vehicle-mounted mechanism (901); The telescopic arm assembly (903) is arranged on the horizontal rotation mechanism (902) and rotatably connected to the horizontal rotation mechanism (902), and the vibrator (3) is suspended on the telescopic arm assembly (903); The hydraulic tie rod assembly (904) is movably connected to the horizontal rotation mechanism (902) and the telescopic arm assembly (903). The mobile vehicle-mounted mechanism (901), the horizontal rotation mechanism (902), the telescopic arm assembly (903), and the hydraulic tie rod assembly (904) are all connected to the verticality control system (4). When the verticality control system (4) detects that the verticality of the hollow drill rod (5) exceeds the preset range, the verticality control system (4) adjusts the verticality of the hollow drill rod (5) through the mobile vehicle-mounted mechanism (901), the horizontal rotation mechanism (902), the telescopic arm assembly (903), and the hydraulic tie rod assembly (904).

6. The construction equipment for micro-hole cast-in-place pile foundations according to claim 1, characterized in that, The adapter (8) is connected to the hollow drill rod (5) by a thread; The adapter (8) is provided with a clamp (17), which is used to clamp and fix the hollow drill rod (5), and after the grouting is completed using the hollow drill rod (5), the hollow drill rod (5) is disassembled and the steel cage (2) is clamped and fixed by the clamp (17). The adapter (8) has several bolt holes (18) for installing solar photovoltaic panel brackets (6).

7. A construction method for micro-hole cast-in-place pile foundations, based on the construction equipment for micro-hole cast-in-place pile foundations as described in claim 1, characterized in that, Includes the following steps: Determine the location of the pile hole, adjust the position of the mobile drilling rig (9) so that the valve drill bit (7) is aligned with the location of the pile hole; The verticality of the hollow drill rod (5) is monitored in real time by the verticality control system (4), and the vibrator (3) is started to press the valve drill bit (7) into the stratum until the design depth is reached to form a pile hole. During this period, if the verticality of the hollow drill rod (5) is detected by the verticality control system (4) to exceed the preset range, an alarm is triggered by the verticality control system (4). After the pile hole is formed, the high-pressure pump truck (12) pumps concrete into the pile hole through the high-pressure grouting pipe (10), the hollow drill rod (5), and the valve drill bit (7). At the same time, the valve drill bit (7) is lifted at a constant speed by the mobile drilling machine (9). When the valve drill bit (7) is raised to a set distance below the ground, the raising of the valve drill bit (7) is stopped. After the concrete pumping is maintained for a set time, the valve drill bit (7) is raised to the ground surface and the concrete pumping is turned off. During the concrete pumping process, the grouting pumping pressure of the high-pressure pump truck (12) is adjusted in real time by the pressure control system (11), and the grouting pumping flow rate of the high-pressure pump truck (12) is adjusted in real time by the flow control system (13). After the concrete is poured, the hollow drill rod (5) is disassembled, and the reinforcing cage (2) or steel pipe is suspended on the conversion joint (8). The reinforcing cage (2) or steel pipe is buried in the concrete of the pile hole using the post-insertion technique. The verticality control system (4) is used to monitor the alignment and verticality of the reinforcing cage (2) or steel pipe during the insertion process. After the steel cage (2) or steel pipe is lowered, the conversion joint (8) is left on the steel cage (2), the pile hole is cleaned, the top of the pile is sealed, and the solar photovoltaic panel bracket (6) is installed on the conversion joint (8).

8. The construction method for micro-hole cast-in-place pile foundation according to claim 7, characterized in that, The pressure control system (11) controls the slurry pumping pressure of the high-pressure pump truck (12) in real time, and the range of the slurry pumping pressure is 2MPa~4MPa. The set distance is 0.5m.

9. The construction method for micro-hole cast-in-place pile foundation according to claim 7, characterized in that, The movable drilling machine (9) lifts the valve drill bit (7) at a constant speed. During the lifting process, the valve drill bit (7) is vibrated for 5s to 10s by a vibrator (3) every 0.5m to 1.0m. The valve drill bit (7) is then lifted again.

10. The construction method of micro-hole cast-in-place pile foundation according to claim 7, wherein the mobile drilling rig (9) comprises a mobile vehicle-mounted mechanism (901), a horizontal rotation mechanism (902), a telescopic arm assembly (903), and a hydraulic tie rod assembly (904), wherein the horizontal rotation mechanism (902) is arranged on the mobile vehicle-mounted mechanism (901), the telescopic arm assembly (903) is arranged on the horizontal rotation mechanism (902) and rotatably connected to the horizontal rotation mechanism (902), and the hydraulic tie rod assembly (904) is movably connected to the horizontal rotation mechanism (902) and the telescopic arm assembly (903), and the verticality control system (4) comprises at least one verticality sensor, a data processing module, and an alarm module, characterized in that, It also includes the following steps: The verticality of the hollow drill rod (5) is obtained in real time using the verticality sensor. The data processing module compares the acquired verticality with the preset range in real time. If the acquired verticality exceeds the preset range, the mobile vehicle mechanism (901) is controlled to adjust its position, the horizontal rotation mechanism (902) is controlled to drive the hollow drill rod (5) to rotate horizontally, the telescopic arm assembly (903) is controlled to adjust the height of the hollow drill rod (5), and the telescopic arm assembly (903) is driven by the hydraulic tie rod assembly (904) to adjust the angle in the vertical plane until the verticality of the hollow drill rod (5) is less than or equal to the preset range, and the valve drill bit (7) is aligned with the pile hole position. It also includes: if the obtained verticality exceeds the preset range, the alarm module issues an alarm signal; when the verticality of the hollow drill rod (5) is less than or equal to the preset range, the alarm module stops issuing alarm signals.

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