Middle-mounted dual-drive synchronous rotary drilling rig for well drilling construction and construction method

Abstract

The invention relates to the technical field of drilling construction equipment, in particular to a middle-mounted dual-drive synchronous rotary drilling rig for drilling construction and a construction method. The ground supporting structure comprises a supporting component and a rotary excavating component, the rotary excavating component is installed on the supporting component in a sliding mode, a sleeve component is installed on the supporting component in a sliding mode, the rotary excavating component is sleeved with the sleeve component in a sliding mode, the sleeve component and the rotary excavating component rotate coaxially, and the working positions of the sleeve component and the rotary excavating component are arranged in the middle of the ground supporting structure. A central structure is adopted, the rotary excavating component and the sleeve component are both arranged at the central axis position of the supporting component, stress of the drilling machine in the construction process is more symmetrical, and therefore the perpendicularity and size precision of formed holes are remarkably improved, the rotary excavating component and the sleeve component are designed in a dual-drive synchronous rotary excavating mode, power output can be flexibly adjusted according to stratum conditions, and the drilling efficiency is improved. Efficient cutting and deslagging are achieved, and the drilling speed and the hole cleaning efficiency are greatly improved.

Description

Technical Field

[0001] This invention relates to the technical field of drilling equipment, and in particular to a centrally mounted dual-drive synchronous rotary drilling rig and its construction method for drilling operations. Background Technology

[0002] Drilling is a crucial construction step in projects such as deep foundation pits, underground passages, tunnels, pipe galleries, water wells, and offshore platform foundations. It is widely used in the construction and marine engineering fields. In the construction of urban subways, underground projects, deep foundations, and submarine pipelines, drilling is not only used for the entry and exit of personnel, equipment, and materials, but also serves as an important channel for water supply, drainage, ventilation, and emergency rescue. In marine engineering, drilling is also commonly used in the construction of submarine foundation piles, jacket structures, and submarine tunnels to ensure the safety and functional requirements of the project. Rotary drilling rigs have become one of the mainstream equipment in modern drilling construction due to their advantages such as fast hole-forming speed, high degree of mechanization, and low environmental disturbance. Rotary drilling rigs typically use a drill rod to drive the drill bit to rotate and cut the soil or rock to form a hole. Depending on the construction requirements, rotary drilling can be carried out with or without a casing.

[0003] Casingless rotary drilling is widely used in geological conditions with good soil layers and low groundwater levels due to its simple operation and high speed. However, in loose, saturated, or fluid plastic strata, the well wall is prone to collapse, diameter reduction, and other instability phenomena. Moreover, the drilling process is greatly affected by disturbances, making it difficult to guarantee the verticality and dimensional accuracy of the hole, which poses significant engineering risks. To ensure well wall stability, casing-assisted rotary drilling is often used. The casing plays a supporting and isolation role for the well wall during drilling, significantly improving well wall stability and hole quality. However, in practical applications, the gap between the casing and the drill string is small, making it difficult to smoothly lift drill cuttings to the surface, resulting in low hole cleaning efficiency and a lot of sediment at the bottom of the hole, which affects the smooth progress of subsequent procedures. When the casing sinks asynchronously with the drilling, it is easy to cause the casing to tilt, misalign, or get stuck, affecting the verticality of the hole and construction safety.

[0004] In addition, most common rotary drilling equipment currently has an offset structure, meaning that the drilling device or power head is set on one side of the equipment. This type of offset rotary drilling equipment experiences uneven force during drilling, has poor overall stability, and is prone to uneven loading and swaying, which in turn affects the verticality control of the drill rod, making it difficult to guarantee the verticality of the hole and affecting the structural accuracy and safety of drilling construction.

[0005] Publication No. CN120945876A discloses a vibratory compaction device, which includes a main body assembly, a sleeve-pulling device, and a vibratory compaction unit. In this device, the main body assembly has a column with a first guide rail; the sleeve-pulling device is vertically mounted on the first guide rail for pulling out sleeves; the vibratory compaction unit is vertically mounted on the first guide rail and works in conjunction with the sleeve-pulling device for vibratory compaction of the foundation. The sleeve-pulling device and the vibratory compaction unit work together. This patent technology discloses a dual-drive operating mechanism for the sleeve-pulling device and the vibratory compaction unit. Dual-drive operation results in significantly higher force than single-drive operation. However, in this technology, both drives are located on one side, which can easily lead to force imbalance or cause higher stress unevenness than in general pile foundation equipment. Summary of the Invention

[0006] To address the problems of unstable borehole walls and difficulty in ensuring verticality in casingless rotary drilling, and the difficulty in cleaning boreholes in casing-equipped rotary drilling, and to improve the stress stability and drilling verticality of the borehole, this invention provides a centrally mounted dual-drive synchronous rotary drilling rig and its construction method for well drilling.

[0007] On the one hand, the technical solution of the centrally mounted dual-drive synchronous rotary drilling rig for drilling operations provided by the present invention is as follows: A centrally mounted dual-drive synchronous rotary drilling rig for well drilling includes a support component and a rotary drilling component. The rotary drilling component is slidably mounted on the support component. The support component controls the switching between horizontal and vertical placement of the rotary drilling component by swinging. The rotary drilling component slides along the support component and drills downwards to form a hole. A sleeve component is slidably mounted on the support component. The sleeve component is slidably sleeved on the outside of the rotary drilling component, and the sleeve component and the rotary drilling component rotate coaxially. An actuating component is connected to the sleeve component and the rotary drilling component. The actuating component is used to control the movement process and direction of the sleeve component and the rotary drilling component. The working position of the sleeve component and the rotary drilling component is located at the middle position of the ground support structure.

[0008] The rig adopts a centrally located structure, with both the rotary drilling component and the sleeve component positioned at the central axis of the supporting structure. This ensures more symmetrical force distribution during drilling, significantly improving the overall stability of the equipment and effectively avoiding the swaying and off-center loading issues caused by uneven force distribution in traditional non-centrally located equipment. Consequently, it significantly improves the verticality and dimensional accuracy of the borehole. The rotary drilling component and the sleeve component employ a dual-drive synchronous rotary drilling design, allowing for flexible adjustment of power output according to formation conditions. This enables efficient cutting and slag removal, greatly increasing drilling speed and borehole cleaning efficiency. It is particularly suitable for drilling operations in complex or hard formations. The sleeve component rotates coaxially with the rotary drilling component, providing effective support to the wellbore during drilling to prevent wellbore collapse and diameter reduction. Simultaneously, it allows for synchronous casing sinking and drilling, effectively solving problems such as casing misalignment and jamming, ensuring borehole quality and construction safety. The actuation component controls the movement process and direction of the sleeve component and the rotary drilling component, enabling efficient switching of the drilling rig from horizontal transport to vertical operation.

[0009] Furthermore, the supporting component includes a supporting mast and a vehicle body. The supporting mast is sway-mounted on the vehicle body. The supporting mast includes a horizontally placed state one and a vertically upright state two. A slide rail is provided on one side of the supporting mast.

[0010] The support mast adopts a swingable structure, which can switch between horizontal and vertical placement on the vehicle body. In the horizontal placement state, the overall height of the equipment is reduced, which facilitates road transportation and layout in narrow construction sites, improving the mobility and relocation efficiency of the equipment. Through the swing mechanism of the support mast, the drilling rig can be quickly and smoothly switched from transportation mode to operation mode. In the vertical position, the support mast can provide a stable support foundation for the rotary drilling component. With the help of the slide rail, the rotary drilling component can be accurately guided and slide up and down, effectively ensuring the verticality of the equipment and the stability of operation during drilling, further improving the hole accuracy and construction safety. The combination of the swingable support mast and the slide rail guide structure optimizes the overall layout of the equipment and makes the integration of each core component higher.

[0011] Furthermore, a swing frame is provided at the bottom of the support mast, a luffing cylinder is hinged to one side of the top of the swing frame, and a lateral push cylinder is hinged to the bottom of the swing frame on the side opposite to the luffing cylinder. In state two, a diagonal brace is connected to the top of the support mast, and the bottom of the diagonal brace is supported on the edge of the vehicle body.

[0012] The combined design of the swing frame with the luffing cylinder and the lateral thrust cylinder enables the support mast to achieve rapid and precise swinging and luffing adjustments on the vehicle body. When vertically upright, the top of the support mast forms a triangular support structure with the edge of the vehicle body through the diagonal bracing, effectively distributing the working load and significantly improving the overall structural stability and anti-overturning ability, ensuring the safety and reliability of the drilling process. The reinforcement of the top of the support mast by the diagonal bracing provides additional lateral support for the equipment under high-intensity construction operations, reducing the safety risks caused by equipment instability. The luffing cylinder and the lateral thrust cylinder can be integrated with an automated drive and intelligent monitoring system to realize functions such as mechanized state conversion and precise angle adjustment, improving the level of construction automation.

[0013] Furthermore, the bottom of the vehicle body is provided with track wheels, the edge of the vehicle body is provided with outriggers that extend outward, and the middle of the vehicle body is provided with a U-shaped frame that is used to clamp and fix the bottom of the support mast in state two.

[0014] Tracked wheels are located at the bottom of the vehicle body, enabling the equipment to adapt to complex terrain and possess excellent off-road and passability capabilities. This facilitates flexible movement and relocation within and outside the construction site, expanding the equipment's operational application scenarios. Outriggers are located at the edge of the vehicle body and can extend outwards, unfolding before operation to effectively increase the support area and form a larger support base, significantly improving the machine's anti-tipping ability and operational stability. This provides safety assurance for high-intensity or high-precision operations. The extended outriggers not only enhance stability but also facilitate rapid leveling and positioning of the equipment under different ground conditions. The U-shaped frame located in the middle of the vehicle body can be snapped and fixed to the bottom of the vertical support mast, ensuring that the support mast will not shift or swing during operation, further improving the accuracy and safety of the equipment during operation. The snap-fit ​​design of the U-shaped frame simplifies the connection between the support mast and the vehicle body, enabling quick assembly and disassembly.

[0015] Furthermore, the rotary drilling component includes a first drive, a drill rod, and a first slider. The first drive is connected to the drill rod, which is a spiral drill rod. The first drive and the drill rod are mounted on the first slider and are slidably installed along the slide rail by the first slider.

[0016] The combination of the first drive and the auger drill rod enables efficient rotational drive of the drill rod, allowing for rapid and stable drilling operations. The auger drill rod structure facilitates continuous cutting and transport of soil or rock, improving drilling efficiency and hole quality. The cooperation between the first slider and the slide rail allows the entire rotary drilling component to move smoothly up and down along the slide rail. The sliding drive of the first slider enables convenient automatic lifting and lowering of the drill bit. The sliding installation along the slide rail facilitates on-site installation, disassembly, and maintenance. The stable sliding of the first slider along the slide rail effectively prevents the drill rod from shaking and shifting during drilling, ensuring the verticality of the borehole and operational safety.

[0017] Furthermore, the first drive transmission spindle is provided with a connecting seat at its end, the drill rod is provided with a connecting head at its top end, the drill rod is connected to the connecting seat through the connecting head and driven by transmission, the first slider is provided with an upper pulley on the contact surface with the slide rail, and the first slider is provided with an insertion block at its bottom.

[0018] By setting a connecting seat at the end of the first drive spindle and a connecting head at the top of the drill rod, a precise docking and stable connection is achieved between the drill rod and the drive device, ensuring efficient and stable power transmission to the drill rod and reducing energy loss and failure risks caused by loosening or poor connection. The modular design of the connecting head and connecting seat makes the installation and disassembly of the drill rod simpler and faster, which is conducive to quick replacement of the drill rod or maintenance on site. An upper pulley is set on the contact surface between the first slider and the slide rail, which effectively reduces the frictional resistance of the slider on the slide rail, making the slider move more smoothly and reducing jamming. A plug-in block is set at the bottom of the first slider, which can be plugged and fixed with related structures to reduce the slider's deviation or shaking during drilling or lifting, ensuring the verticality of the borehole and the construction accuracy.

[0019] Furthermore, the sleeve component includes a second drive, a sleeve, and a second slider. The second drive is connected to the sleeve via a transmission. The sleeve is rotatably installed along a vertical central axis. The second drive and the sleeve are mounted on the second slider and are slidably installed along a slide rail by the second slider.

[0020] The transmission connection between the second drive and the sleeve enables the sleeve to rotate stably along the vertical central axis, effectively meeting the needs of rotary drilling and other operations for sleeve rotation drive. The second drive and the sleeve are integrated and installed on the second slider. The second slider drives the sleeve and drive device to slide along the slide rail, allowing the sleeve to move flexibly between different working positions and meet the positioning requirements under various construction conditions. The sliding installation of the second slider along the slide rail effectively ensures the smooth movement and accurate positioning of the sleeve and drive device in the vertical direction, reduces construction errors caused by offset or shaking, and improves the control accuracy of drilling depth and verticality.

[0021] Furthermore, the second drive transmission is connected to the rotary seat, which drives the sleeve to rotate. The bottom of the sleeve is provided with cutting teeth. A lower pulley is provided on the contact surface between the second slider and the slide rail. A plug-in seat is provided on the top of the second slider. A discharge port is provided on one side of the plug-in seat. The plug-in seat and the plug-in block are matched in shape and plugged together.

[0022] The second drive rotates the sleeve via a rotary seat. Cutting teeth are installed at the bottom of the sleeve to efficiently transmit the driving force to the cutting end, enhancing the cutting ability of the formation and improving drilling speed and construction efficiency. A discharge port is provided on one side of the plug-in seat to effectively discharge soil chips, rock debris, and other materials generated during drilling, preventing blockage. The plug-in seat and plug-in block are shaped to improve the stability when connected, ensuring the stability of the sleeve and auger drill rod assembly. A sliding wheel is installed on the contact surface between the second slider and the slide rail to effectively reduce the frictional resistance between the slider and the slide rail, making the slider move more smoothly and steadily on the slide rail, reducing motion jamming, and improving positioning accuracy.

[0023] Furthermore, the actuating components include a winch device, which drives the drilling process of the sleeve component and the rotary drilling component. The winch device is connected to the sleeve component and the rotary drilling component via a drive cable, and controls the return and progress of the sleeve component and the rotary drilling component by pulling and releasing the drive cable. A pulley block is provided on the support component, and the drive cable is wound around the pulley block. A positioning sleeve is slidably provided at the bottom of the sleeve component and the rotary drilling component. The positioning sleeve is slidably installed by a sliding cylinder. A rotary pulley is provided on the contact surface between the positioning sleeve and the sleeve component and the rotary drilling component.

[0024] The winch system uses a drive cable to raise and lower the sleeve and rotary drilling components, enabling flexible and precise control of the drilling tool's return and progress. This allows for adjustments to drilling depth and speed under different working conditions. The drive cable winds through pulley blocks on the support components, effectively changing the direction of force, reducing cable friction and power loss, and improving power transmission efficiency. The pulley blocks also distribute the force on the cable, reducing the workload on the winch and cable. The positioning sleeve uses a sliding cylinder for precise sliding adjustment, enabling quick and accurate positioning of the sleeve and rotary drilling components. This ensures the stability of the drilling tool during operation, effectively preventing deviation and swaying, and improving drilling accuracy. Rotary pulleys are installed at the contact surfaces between the positioning sleeve and the sleeve and rotary drilling components, significantly reducing frictional resistance during relative movement and making the sliding between components smoother.

[0025] On the other hand, the drilling construction method provided by the present invention adopts the following technical solution: A drilling construction method includes the following specific construction steps: Select a suitable construction site and thoroughly clear the site, remove surface obstacles, use detection equipment to conduct geological surveys of the site, confirm the underground structure and soil conditions, ensure that there are no underground pipelines or other obstacles affecting construction, and accurately lay out and mark the drilling location according to the design drawings to ensure the accuracy of construction positioning. Transport the dedicated mid-mounted dual-drive synchronous rotary drilling rig to the construction site, conduct a preliminary inspection of the rig, select a suitable support position to ensure the machine body is stable, accurately position the rig according to the predetermined center point, adjust the outriggers to ensure the rig is vertical, connect the external power supply or the self-provided generator, check the power supply system to ensure that the equipment can operate safely and stably. The drilling rig is started, and a process of simultaneous casing drilling and rotary drilling is adopted. Casing drilling is used to determine the drilling diameter and drilling depth and to serve as wellhead support. Rotary drilling is used to break up and excavate the soil and rock inside the casing. During the drilling process, the direction and verticality of the drill bit are monitored in real time and adjusted in a timely manner through the equipment control system to ensure the vertical accuracy of the drilled well. During the drilling process, the drilling rig brings soil and rock debris to the surface. The excavated soil and rock are promptly removed from the wellhead and piled in a designated area or transported away using a combination of methods such as hoisting buckets, mechanical shovels, or manual labor. After drilling to the predetermined depth, gradually lift the rotary drilling tool and pull it out of the casing. Check whether there is any residual soil, rock, or debris inside the casing. Use a mud pump or manual cleaning to thoroughly clean it. After drilling and slag removal are completed, the entire construction site is thoroughly cleaned to remove any remaining construction waste, soil, rocks, and equipment oil stains. The surrounding environment is inspected, the site is restored to cleanliness, and the drilling rig and auxiliary equipment are inspected and maintained before being removed from the site.

[0026] By conducting thorough geological surveys and obstacle clearing before construction, potential risks such as underground pipelines and geological anomalies can be effectively avoided, ensuring the safety of the construction process and reducing the probability of accidents. Precise layout and marking, combined with the high-precision positioning and verticality adjustment of the centrally mounted dual-drive synchronous rotary drilling rig, ensure the drilling location and verticality, resulting in excellent well quality that meets the needs of subsequent projects. The combination of synchronous casing drilling and rotary drilling technology can effectively support the wellhead in complex strata such as soft, loose, and water-bearing formations, preventing collapse and improving the adaptability and safety of drilling construction. The use of a dedicated rotary drilling rig, with drilling and casing operations operating simultaneously, greatly improves drilling speed and overall construction efficiency, shortens the construction period, and saves manpower and machinery costs.

[0027] In summary, the present invention has the following beneficial technical effects: 1. The equipment adopts a centrally located structure, with all core components positioned on the central axis of the supporting components. This ensures that the equipment is subjected to uniform force during drilling and lifting, effectively preventing uneven loading and swaying, and significantly improving the overall stability and anti-overturning ability of the equipment.

[0028] 2. The centrally located layout, combined with the guide rail, makes the equipment's movement trajectory more stable during the drilling process, effectively preventing drill bit deviation, and significantly improving the verticality and dimensional accuracy of the hole, thus meeting the requirements of high-standard drilling operations.

[0029] 3. Both the rotary drilling component and the sleeve component adopt independent drive devices, and the power output can be adjusted synchronously or independently. The power can be flexibly distributed according to different formation conditions to achieve efficient cutting and slag removal, improve drilling efficiency, and is especially suitable for complex or hard formations.

[0030] 4. During the synchronous sinking process of drilling, the sleeve component provides effective support to the well wall, preventing well wall collapse and borehole diameter reduction, solving the problems of misalignment or jamming during the sinking of traditional casings, and ensuring drilling quality and construction safety.

[0031] 5. The support mast adopts a swingable structure, which can switch between horizontal and vertical operation modes on the vehicle body. The horizontal mode facilitates transportation and site layout, while the vertical mode improves operational stability and greatly enhances equipment mobility and relocation efficiency.

[0032] 6. The top of the support mast forms a triangular stable support with the edge of the vehicle body through diagonal bracing, which effectively distributes the load, improves the equipment's anti-overturning ability, ensures the safety of high-intensity construction operations, and reduces the risk of instability.

[0033] 7. The bottom track wheels give the equipment good off-road capability, and the outriggers can greatly expand the support area, enhance the stability and leveling ability of the equipment under various ground conditions, and adapt to complex terrain and diverse construction environments.

[0034] 8. The drill pipe and drive unit adopt a combination of connector and connector seat, which facilitates quick disassembly and maintenance. The contact surface between the slider and the slide rail is equipped with pulleys to effectively reduce frictional resistance and improve the smoothness and accuracy of drill lifting and positioning.

[0035] 9. The positioning sleeve is precisely adjusted by a sliding hydraulic cylinder, and the bottom contact surface is equipped with a rotary pulley to reduce frictional resistance, enabling rapid and stable positioning of the sleeve and rotary drilling components, improving drilling accuracy and automation level, effectively preventing deviation, and improving construction efficiency. Attached Figure Description

[0036] Figure 1 This is a flowchart of the drilling process of the present invention; Figure 2 This is a schematic diagram of the rotary drilling rig of the present invention in use. Figure 3 for Figure 1 A schematic diagram of the second-view structure; Figure 4 This is a side view of the structure of the present invention; Figure 5 This is a schematic diagram of the main structure of the present invention; Figure 6 for Figure 2 A partial schematic diagram of point A; Figure 7 for Figure 5 Another perspective partial schematic diagram; Figure 8 This is a partial schematic diagram of the positioning sleeve structure of the present invention.

[0037] Explanation of reference numerals in the attached figures: 1. Supporting components; 11. Support mast; 111. Slide rail; 112. Diagonal brace; 12. Vehicle body; 121. Track wheel; 122. Outrigger; 123. U-shaped frame; 13. Swing frame; 131. Luffing cylinder; 132. Lateral thrust cylinder; 2. Rotary drilling components; 21. First drive; 211. Connecting seat; 22. Drill rod; 221. Connecting head; 23. First slider; 231. Upper pulley. 232. Insert block; 3. Sleeve component; 31. Second drive; 311. Rotary seat; 32. Sleeve; 321. Cutting tooth; 33. Second slider; 331. Lower pulley; 332. Insert block; 333. Discharge port; 4. Actuating component; 41. Hoisting device; 411. Drive cable; 412. Pulley block; 42. Positioning sleeve; 421. Sliding cylinder; 422. Rotary pulley. Detailed Implementation

[0038] The following will be combined with the appendix Figures 1-8 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "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 invention, and are not intended to 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 of this invention.

[0040] Example 1: This invention discloses a centrally mounted dual-drive synchronous rotary drilling rig for well drilling operations, with reference to... Figure 2The system includes a support member 1 and a rotary drilling member 2. The rotary drilling member 2 is slidably mounted on the support member 1. The support member 1 controls the switching between horizontal and vertical placement of the rotary drilling member 2 by swinging. The rotary drilling member 2 slides along the support member 1 and drills downwards to form a hole. A sleeve member 3 is slidably mounted on the support member 1. The sleeve member 3 is slidably sleeved on the outside of the rotary drilling member 2, and the sleeve member 3 and the rotary drilling member 2 rotate coaxially. An actuating member 4 is connected to the sleeve member 3 and the rotary drilling member 2. The actuating member 4 is used to control the movement process and direction of the sleeve member 3 and the rotary drilling member 2. The working position of the sleeve member 3 and the rotary drilling member 2 is set in the middle of the ground support structure.

[0041] The support component 1 is securely installed in the middle of the ground support structure to ensure good stability of the equipment during construction. By controlling the swing of the support component 1, the rotary drilling component 2 is adjusted from a horizontal position to a vertical position and aligned with the predetermined drilling position.

[0042] Start the sleeve component 3, slide along the support component 1 and rotate downwards. At this time, the sleeve component 3 begins to drill a hole in the ground. The rotary drilling component 2 rotates coaxially and works in coordination with the sleeve component 3 to clear the soil and rocks inside the sleeve component 3, ensuring the stability and verticality of the drilling.

[0043] The motion component 4 controls the motion process and direction of the rotary drilling component 2 and the sleeve component 3 in real time to adapt to different geological conditions, monitor the operating status of the drilling rig, and ensure the smooth and efficient rotary drilling process.

[0044] After reaching the predetermined depth, stop the rotary drilling operation of the drilling rig, use the actuating component 4 to lift the rotary drilling component 2 to the initial position, and restore the equipment to its original state.

[0045] Example 2: Based on Example 1, the following is added: Reference Figures 2-5 The supporting member 1 includes a supporting mast 11 and a vehicle body 12. The supporting mast 11 is swayed and mounted on the vehicle body 12. The supporting mast 11 has a horizontally placed state and a vertically upright state. A slide rail 111 is provided on one side of the supporting mast 11.

[0046] Reference Figures 2-4 The bottom of the support mast 11 is provided with a swing frame 13. A luffing cylinder 131 is hinged to one side of the top of the swing frame 13. A horizontal push cylinder 132 is hinged to the bottom of the swing frame 13 on the side opposite to the luffing cylinder 131. The top of the support mast 11 in state two is connected to a diagonal brace 112. The bottom of the diagonal brace 112 is supported on the edge of the vehicle body 12.

[0047] Reference Figures 2-5The bottom of the vehicle body 12 is provided with track wheels 121, and the edge of the vehicle body 12 is provided with outriggers 122. The outriggers 122 extend outward. The middle of the vehicle body 12 is provided with a U-shaped frame 123, which is used to clamp and fix the bottom of the support mast 11 in state two.

[0048] The support mast 11 is the main support part of the equipment. It is designed to have two states: horizontal and vertical. The state can be switched by the swing frame 13. A slide rail 111 is provided on one side of the support mast 11, which is used for the rotary drilling component 2 to slide up and down along the slide rail, thereby realizing the drilling operation.

[0049] The bottom of the support mast 11 is connected to the vehicle body 12 via a swing frame 13. A variable amplitude cylinder 131 is hinged to the top side of the swing frame 13 to control the support mast 11 to swing from state one to state two, thus completing the switching between the horizontal and vertical states.

[0050] A horizontal push cylinder 132 is hinged to the bottom of the swing frame 13 on the side opposite to the luffing cylinder 131. The luffing cylinder 131 and the horizontal push cylinder 132 are used to fine adjust the swing angle of the support mast 11 to ensure the verticality of the support mast 11.

[0051] In state two, the top of the support mast 11 is connected to a diagonal brace 112, and the bottom of the diagonal brace 112 is supported on the edge of the vehicle body 12 to provide additional support and increase the stability of the equipment.

[0052] The bottom of the vehicle body 12 is equipped with track wheels 121 for moving the equipment and adapting to the needs of different construction sites. The edges of the vehicle body 12 are equipped with outriggers 122, which can extend outward to increase the support area of ​​the equipment, thereby improving the stability of the equipment and preventing it from tipping over. The middle of the vehicle body 12 is equipped with a U-shaped frame 123, which is used to engage and fix the bottom of the support mast 11 in state two, ensuring the stability of the support mast 11 in the vertical state.

[0053] After transporting the equipment to the construction site, the vehicle body 12 is first moved to the predetermined drilling position by the track wheels 121. The outriggers 122 are adjusted to extend outward and firmly support the ground, thereby improving the stability of the equipment. The connection of the swing frame 13, the luffing cylinder 131 and the transverse thrust cylinder 132 is checked to ensure that they are in normal working condition.

[0054] Start the luffing cylinder 131 and the transverse thrust cylinder 132 to control the support mast 11 to gradually swing from state one to state two. The transverse thrust cylinder 132 pushes the bottom of the support mast 11 to the U-shaped frame 123 for locking and fixing. The luffing cylinder 131 is used to fine adjust the swing angle of the support mast 11 during the state switching process to ensure the verticality of the support mast 11. When the support mast 11 is completely vertical, its bottom is fixed to the U-shaped frame 123 and connected to the diagonal brace 112 to enhance the stability of the support mast 11.

[0055] After drilling is completed, the support mast 11 is released from the U-shaped frame 123, and the support mast 11 is swung to a lateral position by the luffing cylinder 131. The outriggers 122 are retracted, and the track wheels 121 are used to move the equipment to the next construction position. The above operation is repeated.

[0056] Example 3: Based on Example 2, the following is added: Reference Figures 2-7 The rotary drilling component 2 includes a first drive 21, a drill rod 22 and a first slider 23. The first drive 21 is connected to the drill rod 22, which is a spiral drill rod. The first drive 21 and the drill rod 22 are mounted on the first slider 23 and are slidably mounted along the slide rail 111 by the first slider 23.

[0057] Reference Figures 2-7 The first drive 21 has a connecting seat 211 at the end of the transmission spindle, and the drill rod 22 has a connecting head 221 at the top. The drill rod 22 is connected to the connecting seat 211 through the connecting head 221 and driven by transmission. The first slider 23 has an upper pulley 231 on the contact surface with the slide rail 111, and the first slider 23 has an insertion block 232 at the bottom.

[0058] The rotary drilling component 2 is the core working part of the equipment, mainly including the first drive 21, the drill rod 22 and the first slider 23. The rotary drilling component 2 is slidably mounted on the slide rail 111 on one side of the support mast 11 through the first slider 23, and can move freely in the vertical direction on the slide rail 111.

[0059] The first drive 21 is used to provide power to drive the drill rod 22 to rotate, thereby realizing the drilling operation. The transmission spindle end of the first drive 21 is provided with a connecting seat 211 for connecting with the drill rod 22 and transmitting power.

[0060] The drill rod 22 is a spiral drill rod with a spiral-shaped drill bit, which can effectively break the formation and discharge drill cuttings out of the hole. The top of the drill rod 22 is provided with a connector 221, which matches the connector seat 211 and is connected to the first drive 21 through the connector 221.

[0061] The first slider 23 is a movable support structure of the rotary drilling component 2. The drill rod 22 slides up and down through the slide rail 111. An upper pulley 231 is provided on the contact surface between the first slider 23 and the slide rail 111 to reduce the friction generated during the sliding process and improve the operating efficiency of the rotary drilling component 2. A plug block 232 is provided at the bottom of the first slider 23. The plug block 232 is used to provide additional stability during the drilling process and prevent the slider from deviating.

[0062] Before construction, the first drive 21, drill rod 22 and first slider 23 are assembled to ensure that the connection between the connecting seat 211 and the connecting head 221 is tight and without looseness. The first slider 23 is installed on the slide rail 111 on one side of the support mast 11. The contact state between the upper pulley 231 and the slide rail 111 is adjusted to ensure smooth sliding.

[0063] The first drive 21 is started, and the driving power is transmitted to the drill rod 22 through the connecting seat 211, so that the drill rod 22 starts to rotate. While the drill rod 22 is rotating, the first slider 23 drives the rotary drilling component 2 to slide down along the slide rail 111, so that the auger drill rod 22 gradually enters the formation and completes the drilling operation. The auger structure of the drill rod 22 can effectively break the formation and discharge the drill cuttings out of the hole by rotating, keeping the hole clean.

[0064] During construction, the drilling depth of the drill rod 22 is precisely adjusted by controlling the power output of the first drive 21 and the sliding speed of the first slider 23. The plug block 232 plays a stabilizing role during drilling, ensuring the verticality of the drill rod 22 and preventing the drilling from deviating.

[0065] Once the borehole reaches the predetermined depth, the power output of the first drive 21 is stopped, causing the drill rod 22 to stop rotating. The first slider 23 is used to gradually lift the rotary drilling component 2 along the slide rail 111 to the initial position, and the drill rod 22 is cleaned and maintained.

[0066] Example 4: Based on Example 3, the following is added: Reference Figures 2-7 The sleeve component 3 includes a second drive 31, a sleeve 32, and a second slider 33. The second drive 31 is connected to the sleeve 32. The sleeve 32 is installed rotatably along the vertical central axis. The second drive 31 and the sleeve 32 are installed on the second slider 33 and are slidably installed along the slide rail 111 by the second slider 33.

[0067] Reference Figures 2-8The second drive 31 is connected to the rotary seat 311, which drives the sleeve 32 to rotate. The bottom of the sleeve 32 is provided with cutting teeth 321. The second slider 33 is provided with a sliding wheel 331 on the contact surface with the slide rail 111. The top of the second slider 33 is provided with a plug seat 332. The plug seat 332 is provided with a discharge port 333 on one side. The plug seat 332 and the plug block 232 are matched in shape and plugged together.

[0068] The sleeve component 3 mainly includes a second drive 31, a sleeve 32, and a second slider 33. It is designed to provide a cutting effect during the drilling process and assist in material discharge. The second drive 31 is connected to the rotary seat 311 through a transmission to provide power for the rotational movement of the sleeve 32. The effective connection between the second drive 31 and the rotary seat 311 ensures that the sleeve 32 can rotate along the vertical central axis, thereby realizing the cutting operation.

[0069] The sleeve 32 is mounted on a vertical central shaft and has cutting teeth 321 at the bottom. The cutting teeth 321 are used to cut the hole wall to enhance the forming quality of the hole. During operation, the rotation of the sleeve 32 is driven by the rotary seat 311, which allows it to rotate along the vertical central shaft to achieve the cutting effect.

[0070] The second slider 33 achieves the up-and-down sliding of the sleeve component 3 through the slide rail 111. A sliding wheel 331 is provided on the contact surface with the slide rail 111 to reduce the friction generated during the sliding process and improve the motion efficiency. A plug-in seat 332 is provided on the top of the second slider 33. The plug-in seat 332 and the plug-in block 232 are matched in shape and plugged in to ensure a stable connection between the two.

[0071] After assembling the second drive 31, sleeve 32 and second slider 33, ensure that the rotary seat 311 and sleeve 32 are tightly connected. Install the second slider 33 onto the slide rail 111 on one side of the support mast 11. Adjust the contact state between the lower pulley 331 and the slide rail 111 to ensure smooth sliding.

[0072] The second drive 31 is started, and the sleeve 32 is rotated through the rotary seat 311. The cutting teeth 321 begin to cut the hole wall. The rotational motion of the sleeve 32 causes the cutting teeth 321 to generate an effective cutting force on the hole wall, improving the smoothness and stability of the hole wall. During the construction process, the output power of the second drive 31 and the movement speed of the second slider 33 are adjusted in real time to precisely control the cutting depth of the sleeve 32.

[0073] The plug-in socket 332 provides stability during the cutting process, ensuring the perpendicularity of the sleeve component 3 and preventing skewing. The sleeve component 3 discharges the waste generated during cutting through the discharge port 333, keeping the hole clean. After the cutting operation is completed, the second slider 33 is used to lift the sleeve component 3 to the initial position, and the equipment is cleaned and maintained.

[0074] The construction method of the sleeve component 3 and the rotary drilling component 2 working together: Start the second drive 31 to make the rotary seat 311 drive the sleeve 32 to rotate, and the cutting teeth 321 begin to drill into the stratum. Control the second slider 33 to slide down along the slide rail 111 to gradually complete the drilling depth. According to the preset drilling depth, adjust the operating parameters of the second drive 31 to maintain the consistency between the cutting depth of the sleeve 32 and the soil layer.

[0075] The first drive 21 is started, and the drill rod 22 is rotated through the transmission connection to begin cleaning the soil and rocks inside the sleeve. The spiral structure of the drill rod 22 transports the soil and rocks inside the sleeve 32 upward to the ground surface, where they are discharged through the unloading device.

[0076] The sleeve 32 rotates in the opposite direction to the drill pipe 22.

[0077] While the sleeve component 3 is drilling, the rotary drilling component 2 continues to perform internal cleaning operations to ensure that no soil or rock accumulates during the drilling process. According to the actual site conditions, the power output of the first drive 21 and the second drive 31 is adjusted so that drilling and cleaning are carried out simultaneously.

[0078] Real-time monitoring of the operating status of sleeve 32 and drill rod 22 ensures stable equipment operation. Based on drilling progress and soil and rock clearing efficiency, the operating parameters of the equipment are adjusted in a timely manner to optimize the construction process. During construction, the equipment is inspected and maintained, especially the wear of cutting teeth 321 and drill rod 22 is monitored to ensure that safety measures at the construction site are in place and to prevent personnel from accidentally entering the equipment operating area.

[0079] After reaching the predetermined drilling depth, the operation of the second drive 31 and the first drive 21 is stopped. The second slider 33 is used to lift the sleeve component 3 to the initial position, and the equipment is cleaned and maintained.

[0080] Example 5: Based on Example 1, the following is added: Reference Figures 2-5The actuating component 4 includes a winch 41, which is used to drive the drilling process of the sleeve component 3 and the rotary drilling component 2. The winch 41 is connected to the sleeve component 3 and the rotary drilling component 2 via a drive cable 411, and controls the return and progress of the sleeve component 3 and the rotary drilling component 2 by pulling and releasing the drive cable 411. The support component 1 is provided with a pulley block 412, and the drive cable 411 is wound around the pulley block 412.

[0081] Reference Figure 8 The bottom of the sleeve component 3 and the rotary drilling component 2 is slidably provided with a positioning sleeve 42. The positioning sleeve 42 is slidably installed by a sliding cylinder 421. A rotary pulley 422 is provided on the contact surface between the positioning sleeve 42 and the sleeve component 3 and the rotary drilling component 2.

[0082] Drilling process operations: Start the hoisting equipment 41, and lower the line by driving the cable 411 to gradually lower the sleeve component 3 to the drilling position. Start the second drive 31 of the sleeve component 3 to drive the sleeve 32 to rotate, and use the cutting teeth 321 to drill the formation.

[0083] According to the target drilling depth, the lowering speed of the sleeve component 3 is controlled by the winch 41 pulling the drive cable 411, and the position of the positioning sleeve 42 is adjusted by the sliding cylinder 421 to ensure that the sleeve component 3 is aligned with the drilling center axis and to provide high-precision positioning.

[0084] While drilling the casing component 3, the first drive 21 of the rotary drilling component 2 is started, and the drill rod 22 is lowered into the casing 32 through the drive cable 411 to clear the soil and rocks. The drill rod 22 uses a spiral structure to transport the soil and rocks inside the casing to the ground surface, ensuring that there are no accumulations in the borehole.

[0085] The positioning sleeve 42 is adjusted in position by the sliding cylinder 421, so that the rotary drilling component 2 and the sleeve component 3 maintain good operational coordination. The slewing pulley 422 provides sliding support at the contact surface between the sleeve component 3 and the rotary drilling component 2, reducing frictional resistance during operation and improving equipment stability.

[0086] Drilling return operation: After the predetermined drilling depth is reached, the winch 41 is started, and the sleeve component 3 and the rotary drilling component 2 are pulled up by the drive cable 411. During the return stroke, the first drive 21 of the rotary drilling component 2 continues to run to complete the final stage of soil and rock removal, ensuring that the hole is clean and free of residue.

[0087] Example 6: This invention discloses a drilling construction method, referring to... Figure 1 The specific construction steps include the following: Select a suitable construction site and thoroughly clear the site, remove surface obstacles, use detection equipment to conduct geological surveys of the site, confirm the underground structure and soil conditions, ensure that there are no underground pipelines or other obstacles affecting construction, and accurately lay out and mark the drilling location according to the design drawings to ensure the accuracy of construction positioning. Transport the dedicated mid-mounted dual-drive synchronous rotary drilling rig to the construction site, conduct a preliminary inspection of the rig, select a suitable support position to ensure the machine body is stable, accurately position the rig according to the predetermined center point, adjust the outriggers to ensure the rig is vertical, connect the external power supply or the self-provided generator, check the power supply system to ensure that the equipment can operate safely and stably. The drilling rig is started, and a process of simultaneous casing drilling and rotary drilling is adopted. Casing drilling is used to determine the drilling diameter and drilling depth and to serve as wellhead support. Rotary drilling is used to break up and excavate the soil and rock inside the casing. During the drilling process, the direction and verticality of the drill bit are monitored in real time and adjusted in a timely manner through the equipment control system to ensure the vertical accuracy of the drilled well. During the drilling process, the drilling rig brings soil and rock debris to the surface. The excavated soil and rock are promptly cleared from the wellhead using methods such as hoisting buckets, mechanical shovels, or manual labor, and piled in designated areas or transported away. After drilling to the predetermined depth, gradually lift the rotary drilling tool and pull it out of the casing. Check whether there is any residual soil, rock, or debris inside the casing. Use a mud pump or manual cleaning to thoroughly clean it. After drilling and slag removal are completed, the entire construction site is thoroughly cleaned to remove any remaining construction waste, soil, rocks, and equipment oil stains. The surrounding environment is inspected, the site is restored to cleanliness, and the drilling rig and auxiliary equipment are inspected and maintained before being removed from the site.

[0088] More specific steps include first using manual labor and small machinery to clear debris, construction waste, vegetation, etc. from the site to ensure the ground is level, such as using small excavators and small bulldozers.

[0089] Non-destructive testing equipment such as ground-penetrating radar (GPR), electrical resistivity detectors, and shallow seismic reflectometers are used to conduct a comprehensive scan of the surface and subsurface. The electrical resistivity detectors utilize high-density resistivity meters.

[0090] By combining drilling and sampling, we can analyze the soil layer distribution, thickness, groundwater level, and presence of obstacles. Drilling and sampling involves drilling several shallow holes to obtain soil samples. Obstacles include old foundations, buried pipes, etc.

[0091] According to the design drawings, use a total station or GPS surveying instrument to accurately locate the position, and mark the ground with lime lines, wooden stakes, etc.

[0092] The centrally mounted dual-drive synchronous rotary drilling rig was transported to the site and hoisted and assembled in accordance with the equipment operating procedures. The hydraulic system, electrical system, and lubrication system of the drilling rig were inspected, and key components such as the drill bit and casing were thoroughly inspected.

[0093] Use a total station to assist in positioning the center point of the drilling rig, with the error controlled within ±5mm. Adjust the outriggers of the drilling rig to ensure that the level indicator is completely horizontal. If necessary, lay steel plates or sleepers under the base of the drilling rig to enhance stability. Use a three-phase 380V external power supply or equip a self-provided generator set of 200kW or above. Check the cable insulation and grounding protection.

[0094] The casing is made of steel and its diameter is 50-100mm larger than the designed well diameter. The initial drilling speed of the casing is controlled at 0.3-0.5m / min, and should be appropriately reduced when encountering hard soil or obstacles.

[0095] The operator monitors the drill bit's verticality in real time, with a vertical deviation of ≤1 / 300, and makes dynamic adjustments using the drill rig's built-in sensors and laser verticality meter.

[0096] Small tracked loaders can be deployed around the wellhead to assist in the removal of slag. When the amount of slag is small or during the fine cleaning stage, manual labor can be used to remove the residue and transport the slag to the designated spoil disposal area or load it onto trucks for off-site transport to prevent the accumulation of slag from affecting construction.

[0097] First, use a mud pump to remove residual mud and fine slag, then use a high-pressure water gun to wash the well wall, and finally manually inspect and clean the dead corners with a shovel. Use a depth measuring steel ruler or laser rangefinder to check the well depth to ensure that it meets the design requirements and that the bottom of the well is flat and free of residue.

[0098] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of the invention, and all such modifications and additions should fall within the protection scope of the present invention.

Claims

1. A centrally mounted dual-drive synchronous rotary drilling rig for well drilling, comprising a support member (1) and a rotary drilling member (2), wherein the rotary drilling member (2) is slidably mounted on the support member (1), and the support member (1) controls the switching between horizontal and vertical placement of the rotary drilling member (2) by swinging, wherein the rotary drilling member (2) slides along the support member (1) and drills downwards to form a hole, characterized in that: A sleeve component (3) is slidably installed on the support component (1). The sleeve component (3) is slidably sleeved on the outside of the rotary drilling component (2), and the sleeve component (3) and the rotary drilling component (2) rotate coaxially. An action component (4) is connected between the sleeve component (3) and the rotary drilling component (2). The action component (4) is used to control the movement process and direction of the sleeve component (3) and the rotary drilling component (2). The working position of the sleeve component (3) and the rotary drilling component (2) is set in the middle position of the ground support structure.

2. The centrally mounted dual-drive synchronous rotary drilling rig for drilling operations according to claim 1, characterized in that: The support member (1) includes a support mast (11) and a vehicle body (12). The support mast (11) is swayed and mounted on the vehicle body (12). The support mast (11) includes a horizontally placed state one and a vertically upright state two. A slide rail (111) is provided on one side of the support mast (11).

3. The centrally mounted dual-drive synchronous rotary drilling rig for drilling operations according to claim 2, characterized in that: The bottom of the support mast (11) is provided with a swing frame (13), and a luffing cylinder (131) is hinged to one side of the top of the swing frame (13). A horizontal push cylinder (132) is hinged to the bottom of the swing frame (13) on the side opposite to the luffing cylinder (131). The top of the support mast (11) in state two is connected to a diagonal brace (112), and the bottom of the diagonal brace (112) is supported on the edge of the vehicle body (12).

4. The centrally mounted dual-drive synchronous rotary drilling rig for drilling operations according to claim 2, characterized in that: The bottom of the vehicle body (12) is provided with track wheels (121), the edge of the vehicle body (12) is provided with outriggers (122), the outriggers (122) extend outward, and the middle of the vehicle body (12) is provided with a U-shaped frame (123), which is used to snap and fix the bottom of the support mast (11) in state two.

5. A centrally mounted dual-drive synchronous rotary drilling rig for drilling operations according to claim 2, characterized in that: The rotary drilling component (2) includes a first drive (21), a drill rod (22) and a first slider (23). The first drive (21) is connected to the drill rod (22) and the drill rod (22) is a spiral drill rod. The first drive (21) and the drill rod (22) are mounted on the first slider (23) and are driven by the first slider (23) to slide along the slide rail (111).

6. A centrally mounted dual-drive synchronous rotary drilling rig for drilling operations according to claim 5, characterized in that: The first drive (21) has a connecting seat (211) at the end of the transmission spindle, and a connecting head (221) at the top of the drill rod (22). The drill rod (22) is connected to the connecting seat (211) through the connecting head (221) and driven by transmission. The first slider (23) has an upper pulley (231) on the contact surface with the slide rail (111), and the first slider (23) has a plug block (232) at the bottom.

7. A centrally mounted dual-drive synchronous rotary drilling rig for drilling operations according to claim 6, characterized in that: The sleeve component (3) includes a second drive (31), a sleeve (32), and a second slider (33). The second drive (31) is connected to the sleeve (32) for transmission. The sleeve (32) is installed rotatably along the vertical central axis. The second drive (31) and the sleeve (32) are installed on the second slider (33) and are slidably installed along the slide rail (111) by the second slider (33).

8. A centrally mounted dual-drive synchronous rotary drilling rig for drilling operations according to claim 7, characterized in that: The second drive (31) is connected to the rotary seat (311), which drives the sleeve (32) to rotate. The bottom of the sleeve (32) is provided with cutting teeth (321). The second slider (33) is provided with a sliding wheel (331) on the contact surface with the slide rail (111). The top of the second slider (33) is provided with a plug seat (332). The plug seat (332) is provided with a discharge port (333) on one side. The plug seat (332) and the plug block (232) are matched in shape and plugged together.

9. A centrally mounted dual-drive synchronous rotary drilling rig for drilling operations according to claim 1, characterized in that: The actuating component (4) includes a winch (41), which is used to drive the drilling process of the sleeve component (3) and the rotary drilling component (2). The winch (41) is connected to the sleeve component (3) and the rotary drilling component (2) by a drive cable (411), and controls the return and progress of the sleeve component (3) and the rotary drilling component (2) by pulling and releasing the drive cable (411). A pulley block (412) is provided on the support component (1), and the drive cable (411) is wound around the pulley block (412). A positioning sleeve (42) is slidably provided at the bottom of the sleeve component (3) and the rotary drilling component (2). The positioning sleeve (42) is slidably installed by a sliding cylinder (421). A rotary pulley (422) is provided on the contact surface between the positioning sleeve (42) and the sleeve component (3) and the rotary drilling component (2).

10. A drilling construction method, using a centrally mounted dual-drive synchronous rotary drilling rig as described in any one of claims 1-9, characterized in that, The casing drilling and rotary drilling are carried out simultaneously, including the following specific construction steps: Select a construction site and thoroughly clear the site, remove surface obstacles, use detection equipment to conduct geological surveys of the site, confirm the underground structure and soil conditions, ensure that there are no underground pipelines or other obstacles affecting construction, and accurately lay out and mark the drilling positions according to the design drawings to ensure the accuracy of construction positioning. Transport the centrally mounted dual-drive synchronous rotary drilling rig to the construction site, conduct a preliminary inspection of the rig, select a support position to ensure the machine is stable, accurately position the rig according to the predetermined center point, adjust the outriggers to ensure the rig is vertical, connect the external power supply or the self-provided generator, check the power supply system to ensure the equipment can operate safely and stably. The drilling rig is started, and a process of simultaneous casing drilling and rotary drilling is adopted. Casing drilling is used to determine the drilling diameter and drilling depth and to serve as wellhead support. Rotary drilling is used to break and excavate the soil and rock inside the casing. During the drilling process, the direction and verticality of the drill bit are monitored in real time and adjusted in a timely manner through the equipment control system to ensure the vertical accuracy of the drilled well. During the drilling process, the drilling rig brings soil and rock debris to the surface. The excavated soil and rock are promptly removed from the wellhead and piled in a designated area or transported away using a combination of methods such as hoisting buckets, mechanical shovels, or manual labor. After drilling to the predetermined depth, gradually lift the rotary drilling tool and pull it out of the casing. Check whether there is any residual soil, rock, or debris inside the casing, and thoroughly clean it using a mud pump or manually. After drilling and slag removal are completed, the entire construction site is thoroughly cleaned to remove any remaining construction waste, soil, rocks, and equipment oil stains. The surrounding environment is inspected, the site is restored to cleanliness, and the drilling rig and auxiliary equipment are inspected and maintained before being removed from the site.

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