A whole-protecting-cylinder following-up process for a rotary digging pile machine hole-forming cast-in-place pile

Abstract

The application relates to the construction technology field of cast-in-place piles, and particularly discloses a full-protecting-cylinder following process for hole forming of a rotary digging pile machine cast-in-place pile, which comprises the following steps: determining a pile point, building a bearing platform, guiding a hole, drilling a hole, lowering a protecting cylinder, repeatedly drilling a hole and lowering a protecting cylinder until the pile hole reaches a design depth, lowering a reinforcing cage into the pile hole, pouring concrete, and finally pulling out the protecting cylinder. The application has the effects of reducing the possibility of collapse of the inner wall of the pile hole and cracks of the ground around the pile hole, reducing the flow of mud and the loss of concrete, and reducing the construction cost.

Description

Technical Field

[0001] This application relates to the field of cast-in-place pile construction technology, and in particular to a process for following up with a full casing of cast-in-place piles formed by a rotary drilling rig. Background Technology

[0002] Cast-in-place piles are piles constructed on-site by creating pile holes in the foundation soil using methods such as mechanical drilling, steel pipe extrusion, or manual excavation, then placing a reinforcing cage inside and pouring concrete. Depending on the drilling method, cast-in-place piles can be further classified into driven cast-in-place piles, bored cast-in-place piles, and excavated cast-in-place piles. Pile types constructed using rotary drilling rigs are officially called rotary drilled cast-in-place piles, and are simply referred to as rotary piles in engineering.

[0003] The traditional rotary drilling and grouting pile process includes: using a total station to lay out the construction site and locate the pile points, using a rotary drilling rig to drill holes at the pile points, lowering the reinforcing cage after drilling, pouring concrete, and removing the casing after the concrete pouring is completed.

[0004] Regarding the aforementioned technologies, when the soil in the construction area is backfill soil, the pile hole is prone to collapse and ground cracks during the construction of cast-in-place piles. This requires frequent maintenance of the pile hole and reinforcement of the area around the pile hole. Furthermore, the collapse and cracks can easily lead to mud loss and increased concrete consumption, resulting in resource waste, higher construction costs, and potential construction safety hazards. Summary of the Invention

[0005] To address the issues of high construction costs and ensure construction safety, this application provides a process for following up with full casing on bored piles formed by rotary drilling rigs.

[0006] The technical solution provided in this application for a full casing follow-up process for bored piles produced by rotary drilling rigs is as follows:

[0007] A process for the follow-up of full casing for bored piles formed by rotary drilling rigs includes the following steps:

[0008] S1. Clear obstacles, level the site, use a total station to lay out the site, and determine the stake points;

[0009] S2. Construct a support platform near the pile point. The support platform is used to support the bottom section casing, the standard section casing, the drill bit, and the casing connector.

[0010] S3. Use a rotary drilling rig to drill to a depth of 1m at the pile point;

[0011] S4. After lifting the drill rod, remove the drill bit, install the casing connector on the drill rod, and connect the casing connector to the bottom casing. Rotate and press the bottom casing into the pile hole through the drill rod. When the bottom casing enters the pile hole to a depth of 0.5m, use a spirit level to check the verticality of the bottom casing.

[0012] S5. Continue drilling the pile hole for another 3m using a rotary drilling rig;

[0013] S6. After lifting the drill rod, remove the drill bit, install the casing connector on the drill rod, and connect the casing connector to the standard casing section. Connect the standard casing section to the bottom casing section through the drill rod, lock the standard casing section to the bottom casing section, and rotate and press the bottom casing section into the pile hole through the drill rod. When the lower end of the bottom casing section enters the pile hole to a depth of 1.5m, use a spirit level to check the verticality of the bottom casing section.

[0014] S7. Repeat steps S4 and S5 until the designed depth of the pile hole is reached.

[0015] S8. Fabricate, hoist, and install the steel cage, connect the guide pipe, and lower the guide pipe into the pile hole;

[0016] S9. Pour concrete into the pile hole;

[0017] S10. After the concrete pouring is completed, remove the standard section casing and the bottom section casing.

[0018] By adopting the above technical solution, during the drilling process of the rotary drilling rig, a section of casing is lowered after each section of the pile hole is drilled, thereby achieving full casing follow-up pile hole. This allows the casing to protect and support the formed pile hole, reducing the possibility of pile hole collapse and surrounding ground cracks, reducing mud loss and concrete consumption during construction, thereby reducing construction costs and ensuring construction safety. By setting up a support platform, it is convenient for the rotary drilling rig to change drill bits or casing connectors, and it is also convenient to remove the casing for installation.

[0019] Optionally, the support platform is provided with a first support platform, a second support platform and a third support platform. The first support platform is used to support the drill bit, the second support platform is used to support the casing connector, and the third support platform is used to support the bottom section casing and multiple standard section casings. The first support platform, the second support platform and the third support platform are all rotatably connected to the support platform.

[0020] By adopting the above technical solution, after the rotary drilling rig completes one pile hole, it turns to the top of the bearing platform and places the drill bit on the first bearing platform. The operator disassembles the drill bit and drill rod. The rotary drilling rig continues to rotate, positioning the drill rod above the second bearing platform and connecting it to the casing connector. The operator then installs and locks the drill rod and casing connector. The drilling rig continues to drive the drill rod to the top of the third bearing platform. The bottom section or standard section casing on the third bearing platform is extracted through the casing connector and rotated down into the pile hole. The first, second, and third bearing platforms are all rotatably connected to the bearing platform, allowing the drill bit and casing connector to adjust their mating angles and rotate the casing connector to the docking position, thus facilitating docking with the drill rod.

[0021] Optionally, the third support platform is provided with a plurality of placement cylinders, which are used to place bottom section protective cylinders or standard section protective cylinders. The placement cylinders are rotatably connected to the third support platform, and the plurality of placement cylinders are distributed around the rotation axis of the third support platform.

[0022] By adopting the above technical solution, when the rotary drilling rig extracts the bottom section casing or the standard section casing, the third bearing platform is rotated to rotate the casing to be extracted to the docking position. The placement cylinder can rotate, so that the casing can be rotated and adjusted when docking with the casing connector, which facilitates the connection and locking of the casing and the casing connector.

[0023] Optionally, the first bearing platform, the second bearing platform, the pile hole, and one of the placement cylinders can be located on the same arc trajectory, and the center of the arc is on the rotation axis of the rotary drilling rig.

[0024] By adopting the above technical solution, when the rotary drilling rig switches positions between the drill bit, casing connector, and casing, since the axes of the drill bit, casing connector, and casing are on the same arc and the arc shape is on the rotation axis of the rotary drilling rig, the rotary drilling rig can switch back and forth between multiple positions without moving or adjusting its position, thereby improving construction efficiency.

[0025] Optionally, the standard section casing has an inner connecting ring coaxially arranged at the top and an outer connecting ring coaxially arranged at the top. The bottom section casing has an inner connecting ring coaxially arranged at the top. The inner connecting ring and the outer connecting ring have the same number and size of threaded holes. The outer diameter of the inner connecting ring is the same as the inner diameter of the outer connecting ring. The inner connecting ring can be inserted into the outer connecting ring.

[0026] By adopting the above technical solution, when connecting the standard section casing to the bottom section casing or another standard section casing, the outer connecting ring and the inner connecting ring are inserted to align the threaded holes on the outer connecting ring and the inner connecting ring. Then, bolts are used to connect the outer connecting ring and the inner connecting ring simultaneously to fix the outer connecting ring and the inner connecting ring, thereby achieving the splicing and locking of the two casings. The operation is simple and quick.

[0027] Optionally, the inner connecting ring is provided with a plurality of positioning blocks, and the outer connecting ring is provided with a plurality of first positioning grooves. The positions and shapes of the first positioning grooves and the positioning blocks are adapted to each other, and one first positioning groove corresponds to one positioning block.

[0028] By adopting the above technical solution, when the outer connecting ring and the inner connecting ring are inserted, the positioning block is inserted into the first positioning groove, and the threaded holes on the outer connecting ring and the inner connecting ring are quickly aligned, which facilitates installation.

[0029] Optionally, both the drill bit and casing connector are inserted into the drill pipe and locked by a pin.

[0030] By adopting the above technical solution and installing the drill bit or casing connector, the rotary drilling rig rotates the drill rod above the drill bit or casing connector, inserts the rotating rod into the drill bit or casing connector, and then the operator locks the drill bit or casing connector with a pin. When it is necessary to remove the drill bit or casing connector, simply pull out the pin. The operation is convenient and quick.

[0031] Optionally, the casing connector includes a mounting part and a connecting cylinder. The drill rod is inserted into the mounting part, and the connecting cylinder can be inserted into the inner connecting ring. The connecting cylinder has multiple second positioning grooves, the positions and shapes of which are adapted to the positioning blocks, and one second positioning groove corresponds to one positioning block. The connecting cylinder has multiple threaded holes of the same number and size as the inner connecting ring.

[0032] By adopting the above technical solution, when the casing connector is connected to the casing, the rotary drilling rig connects to the casing connector through the mounting part. The rotary drilling rig drives the casing connector to move, so that the connecting part is inserted into the inner connecting ring. The connecting part and the inner connecting ring are threadedly connected by fasteners such as bolts or threaded rods, thereby realizing the connection between the casing connector and the casing. This makes it easier to transfer the casing to the top of the pile hole and insert it into the pile hole in a relatively stable manner.

[0033] Optionally, the connecting cylinder is provided with a locking component, which is used to lock the connecting cylinder to the inner connecting ring, and the locking component is electrically driven.

[0034] By adopting the above technical solution, when connecting the connecting cylinder and the inner connecting ring, the locking component is driven by electricity to lock the connecting cylinder and the inner connecting ring, which can solve the problem that it is difficult for workers to manually connect the cylinder due to its excessive height, and can also improve the connection efficiency.

[0035] Optionally, the locking assembly includes a locking bolt, a driven gear, a drive gear, and a drive motor. The locking bolt is threadedly connected to the connecting cylinder. One end of the locking bolt can pass through the connecting cylinder and be threadedly connected to the inner connecting ring, while the other end is coaxially and fixedly connected to the driven gear. The drive gear is rotatably connected to the connecting cylinder. The driven gear meshes with and is slidably connected to the drive gear. The drive motor is mounted on the connecting cylinder and is used to drive the drive gear to rotate.

[0036] By adopting the above technical solution, when the locking assembly connects the connecting cylinder and the inner connecting ring, the drive motor drives the drive gear to rotate, which in turn drives the locking bolt to rotate, so that the locking bolt is threaded into the threaded hole of the inner connecting ring. The electric drive can ensure the efficiency and accuracy of the connection.

[0037] In summary, this application includes at least one of the following beneficial technical effects:

[0038] 1. By setting up a bearing platform, a first bearing platform, a second bearing platform, and a third bearing platform, during the construction of cast-in-place piles, the rotary drilling rig moves back and forth between the pile hole, the first bearing platform, the second bearing platform, and the third bearing platform, so that drilling, casing removal, and casing installation are carried out in turn, realizing the construction of the cast-in-place pile with the casing following up. This ensures that the hole wall is continuously supported by the casing, reducing the possibility of hole wall collapse or cracks, reducing the possibility of mud and concrete loss, and thus reducing construction costs.

[0039] 2. By setting an outer connecting part and an inner connecting part, as well as threaded holes, a first positioning groove, and a positioning block on the outer connecting part and the inner connecting part, when splicing the protective sleeve, the outer connecting part and the inner connecting part are inserted together. During the insertion process, the positioning block and the first positioning groove enable the outer connecting part and the inner connecting part to be quickly positioned, which facilitates the alignment of the threaded holes on the outer connecting part and the inner connecting part, so as to facilitate the locking of the outer connecting part and the inner connecting part.

[0040] 3. By setting a locking screw, driven gear, drive gear, and drive motor, when the connecting part is connected to the inner connecting ring, the drive motor drives the drive gear to rotate, which in turn drives the locking screw to rotate, so that the locking screw connects to the threaded hole on the inner connecting ring. Locking and unlocking of the inner connecting ring are both achieved by electricity, thereby solving the problem that it is difficult for workers to lock the connecting part to the inner connecting ring due to the excessive height of the protective sleeve. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0043] Figure 2 This is a schematic diagram of the structure of the standard section casing according to an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of the structure of the sleeve connector according to an embodiment of this application;

[0045] Figure 4 This is a schematic diagram of the casing extraction state according to an embodiment of this application;

[0046] Figure 5 This is a schematic diagram of the connection between the sleeve connector and the standard section sleeve according to an embodiment of this application;

[0047] Figure 6 This is a schematic diagram of the lower protective sleeve in an embodiment of this application;

[0048] Figure 7 This is a top view of an embodiment of this application.

[0049] Reference numerals: 1. Rotary drilling rig; 11. Drill rod; 111. Connecting part; 12. Drill bit; 2. Casing connector; 21. Mounting part; 211. Insertion hole; 212. Pin; 22. Connecting cylinder; 221. Second positioning groove; 23. Locking assembly; 231. Locking bolt; 232. Driven gear; 233. Drive gear column; 234. Drive motor; 235. Threaded cylinder; 3. Standard section casing; 31. Inner connecting ring; 311. Threaded hole; 312. Positioning block; 32. Outer connecting ring; 321. First positioning groove; 4. Bearing platform; 41. First bearing platform; 411. Clearance groove; 42. Second bearing platform; 421. Guide platform; 43. Third bearing platform; 431. Placement cylinder; 5. Pile hole. Detailed Implementation

[0050] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0051] This application discloses a process for the follow-up of full casing in the drilling and grouting of cast-in-place piles using a rotary drilling rig. (Refer to...) Figure 1 The process of using a rotary drilling rig to create a full casing for cast-in-place piles includes the following steps:

[0052] S1. Clear obstacles, level the site, use a total station to lay out the site, and determine the stake points;

[0053] S2. Construct a support platform near the pile point. The support platform 4 is used to support the bottom section casing, the standard section casing 3, the drill bit 12 and the casing connector 2.

[0054] S3. Use a rotary drilling rig to drill to a depth of 1m at one pair of pile points;

[0055] S4. After lifting the drill rod 11, remove the drill bit 12, install the casing connector 2 on the drill rod 11, and connect the casing connector 2 to the bottom casing. Rotate and press the bottom casing into the pile hole 5 through the drill rod 11. When the bottom casing enters the pile hole 5 to a depth of 0.5m, use a spirit level to check the verticality of the bottom casing.

[0056] S5. Use rotary drilling rig 1 to continue drilling 3m into pile hole 5;

[0057] S6. After lifting the drill rod 11, disassemble the drill bit 12, install the casing connector 2 on the drill rod 11, and connect the casing connector 2 to the standard casing section 3. Connect the standard casing section 3 to the bottom casing section through the drill rod 11, lock the standard casing section 3 to the bottom casing section, rotate and press the bottom casing section into the pile hole 5 through the drill rod 11, and when the lower end of the bottom casing section enters the pile hole 5 to a depth of 1.5m, use a spirit level to check the verticality of the bottom casing section.

[0058] S7. Repeat steps S4 and S5 until the designed depth of pile hole 5 is reached.

[0059] S8. Fabricate, hoist, and install the steel cage, connect the guide pipe, and lower the guide pipe into pile hole 5;

[0060] S9. Pour concrete into pile hole 5;

[0061] S10. After the concrete pouring is completed, remove the standard section casing 3 and the bottom section casing.

[0062] Reference Figure 1The support platform 4 is located on one side of the pile hole 5. The support platform 4 in the figure is only a schematic diagram. The support platform 4 can slide relative to the ground via rollers to facilitate movement to the vicinity of another pile hole. During the construction of the cast-in-place pile, the support platform 4 is fixedly connected to the ground via anchor bolts. The support platform 4 is equipped with a first support platform 41, a second support platform 42, and a third support platform 43. All three platforms are circular. The first and second support platforms 41 and 42 are rotatably connected to the support platform 4 and can rotate freely. The third support platform 43 is rotatably connected to the support platform 4 and requires a driving component to rotate. The driving component can be a motor or other mechanical drive structures such as gears or racks. In this embodiment, the third support platform is driven by a servo motor, which is located inside the support platform 4.

[0063] Before constructing the cast-in-place piles, after determining the pile points, the drill rod 11 of the rotary drilling rig 1 is aligned with the pile points to prepare for drilling. The casing connector 2 is placed on the second support platform 42, and the bottom casing section and multiple standard casing sections 3 are placed on the third support platform. After completing the preparation work, the rotary drilling rig 1 begins drilling. After completing one drilling, the rotary drilling rig 1 rotates the drill rod 11 to the top of the first support platform 41 and places the drill bit 12 on the first support platform 41. The operator unlocks the drill rod 11 from the drill bit 12. The rotary drilling rig 1 continues to rotate to the top of the second support platform 42 and drives the drill rod 11 to connect with the casing connector 2. The operator locks the drill rod 11 to the casing connector 2 to complete the installation of the casing connector 2. The rotary drilling rig 1 raises the drill rod 11 and continues to rotate until it is above the third support platform 43. Then, the drill rod 11 is lowered to connect the casing connector 2 with the bottom casing or standard casing 3. The bottom casing or standard casing 3 is then raised and rotated to be directly above the pile hole 5, and then rotated and pressed down into the pile hole 5. This process is repeated to achieve full casing follow-through drilling.

[0064] Specifically, refer to Figure 2 The standard section casing 3 has an inner connecting ring 31 at the top and an outer connecting ring 32 at the bottom. Both the inner connecting ring 31 and the outer connecting ring 32 are integrally formed with the standard section casing 3. The inner diameter of the inner connecting ring 31 is the same as the inner diameter of the standard section casing 3, and its outer diameter is smaller than the outer diameter of the standard section casing 3. The outer diameter of the outer connecting ring 32 is the same as the outer diameter of the standard section casing 3, and its inner diameter is larger than the inner diameter of the standard section casing 3. The bottom section casing has an inner connecting ring 31 at the top, which is not shown in the figure.

[0065] Reference Figure 2Both the inner connecting ring 31 and the outer connecting ring 32 have multiple threaded holes 311 evenly distributed along their circumference. In this embodiment, both the inner connecting ring 31 and the outer connecting ring 32 have ten threaded holes 311. The inner connecting ring 31 has multiple positioning blocks 312, which are evenly distributed along the circumference of the inner connecting ring 31. The positioning blocks 312 are arc-shaped plates that fit against the inner connecting ring 31. The side of the positioning block 312 away from the inner connecting ring 31 is flush with the outer wall of the standard section sleeve 3, and the end of the positioning block 312 away from the standard section sleeve 3 is set as a pointed cone. In this embodiment, the inner connecting ring 31 has five positioning blocks 312, which are located in the middle of two adjacent threaded holes 311. The outer connecting ring 32 has multiple first positioning grooves 321, the number and shape of which are the same as those of the positioning blocks 312.

[0066] When splicing the standard section casing 3 with the bottom section casing, or two standard section casings 3, the outer connecting ring 32 and the inner connecting ring 31 are inserted. During the insertion process, the positioning block 312 and the first positioning groove 321 are engaged, which enables the relative position of the outer connecting ring 32 and the inner connecting ring 31 to be quickly positioned, making it easy to align the threaded holes 311 on the outer connecting ring 32 and the inner connecting ring 31. The pointed conical end on the positioning block 312 facilitates the insertion and engagement of the positioning block 312 and the positioning groove 3221, thereby improving the splicing efficiency of the casing. After the outer connecting ring 32 and the inner connecting ring 31 are inserted, the threaded holes 311 on the outer connecting ring 32 and the inner connecting ring 31 are threaded together using hexagonal socket head cap screws, thereby locking the outer connecting ring 32 and the inner connecting ring 31.

[0067] Reference Figure 3 The bottom end of the drill rod 11 is welded with a connecting part 111, which is a rectangular block. The bottom of the connecting part 111 has a mounting hole. The top of the casing connector 2 and the drill bit 12 are both provided with mounting parts 21, which are also rectangular blocks. The top of the mounting part 21 has a socket 211, which is adapted to the shape of the connecting part 111. The top of the socket 211 has a chamfer to facilitate the insertion of the connecting part 111 into the socket 211. The bottom of the mounting part 21 has a mounting hole of the same size as the bottom of the connecting part 111. When the connecting part 111 is inserted into the bottom of the socket 211, the mounting holes on the connecting part 111 and the mounting part 21 are aligned.

[0068] When connecting the drill rod 11 or the casing connector 2 to the drill rod 11, first adjust the position of the drill rod 11 using a rotary drilling rig so that the connecting part 111 is above the mounting part 21, and insert the connecting part 111 into the insertion hole 211. The operator then inserts the pin 212 into the mounting holes of the connecting part 111 and the mounting part 21, thereby realizing the installation of the drill rod 11 or the casing connector 2.

[0069] Reference Figure 3The sleeve connector 2 also includes a connecting cylinder 22 and a locking assembly 23. The connecting cylinder 22 is a cylindrical tube with its opening facing downwards. Multiple sets of locking assemblies 23 are provided, evenly distributed along the circumference of the connecting cylinder 22. In this embodiment, five sets of locking assemblies 23 are provided. The connecting cylinder 22 has multiple threaded holes 311 of the same size as those on the inner connecting ring 31. Multiple second positioning grooves 221 are provided on the circumference of the connecting cylinder 22. The second positioning grooves 221 are the same shape and size as those on the positioning blocks 312, and the number of grooves is the same. In this embodiment, the connecting cylinder 22 has ten threaded holes 311 and five second positioning grooves 221.

[0070] Reference Figure 3 The locking assembly 23 includes a locking bolt 231, a driven gear 232, a drive gear 233, and a drive motor 234. A threaded cylinder 235 is welded to the threaded hole 311 on the connecting cylinder 22 near the locking assembly 23. The threaded cylinder 235 is threadedly connected to the threaded hole 311, and the locking bolt 231 is threadedly connected to the threaded cylinder 235. The driven gear 232 is fixed to the end of the locking bolt 231 away from the threaded cylinder 235. The drive gear 233 is rotatably connected to the connecting cylinder 22 and is always meshed with the driven gear 232. The driven gear 232 can slide along the length of the drive gear 233. The drive motor 234 is a servo motor. The drive motor 234 is fixedly connected to the connecting cylinder 22 by bolts, and the movable end of the drive motor 234 is coaxially fixedly connected to the drive gear 233.

[0071] When the sleeve connector 2 is connected to the standard section sleeve 3 or the bottom section sleeve, the connecting sleeve 22 is inserted into the inner connecting ring 31. During the insertion process, the positioning block 312 is inserted into the second positioning groove 221, so that the threaded sleeve 235 is aligned with the threaded hole 311 on the inner connecting ring 31. The drive motor 234 is started, so that the drive motor 234 drives the drive gear 233 to rotate, so that the driven gear 232 drives the locking bolt 231 to rotate. The locking bolt 231 gradually moves closer to the inner connecting ring 31 and is threadedly connected to the threaded hole 311 on the inner connecting ring 31, thereby connecting the inner connecting ring 31 with the connecting sleeve 22.

[0072] Reference Figure 4 After the rotary drilling rig 1 completes one drilling of the pile hole 5, the drill bit 12 is placed on the first support platform. The operator pulls out the pin 212 and removes the drill bit 12 from the drill rod 11. Then the rotary drilling rig transfers the drill rod 11 to the second support platform 42. The operator connects the casing connector 2 on the second support platform 42 to the drill rod 11. The rotary drilling rig 1 lifts the casing connector 2 above the standard section casing 3 or the bottom section casing to extract the casing.

[0073] Reference Figure 4 and Figure 5The first support platform 41 has a clearance groove 411, which can avoid the cutting edge at the bottom of the drill bit 12, so that the drill bit 12 can be placed stably on the first support platform 41. The second support platform 42 has a guide platform 421, which is frustum-shaped and coaxial with the second support platform. The outer diameter of the guide platform 421 is the same as the inner diameter of the connecting cylinder 22. When the protective sleeve connector 2 is placed on the second support platform 42, the guide platform 421 can guide the connecting cylinder 22, making it easier to position the protective sleeve connector 2 to the center of the second support platform 42.

[0074] Reference Figure 6 The third support platform 43 is provided with multiple placement cylinders 431. The placement cylinders 431 are cylindrical with their openings facing upwards. The inner diameter of the placement cylinders 431 is slightly larger than the diameter of the standard section protective cylinder 3. The multiple placement cylinders 431 are evenly distributed along the circumference of the third support platform 43. In this embodiment, there are five placement cylinders 431. The placement cylinders 431 are rotatably connected to the third support platform 43 so that when the protective cylinder connector 2 docks with the standard section protective cylinder 3 or the bottom section protective cylinder, the standard section protective cylinder 3 or the bottom section protective cylinder can adjust its own position under the pressure of the positioning block 312 and the second positioning groove 221.

[0075] Reference Figure 6 After the standard section casing 3 is removed from the third bearing platform 43, the rotary drilling rig 1 inserts the standard section casing 3 into the standard section casing 3 or bottom section casing inside the pile hole 5. The workers use hexagonal bolts to thread the threaded holes 311 on the inner connecting ring 31 and the outer connecting ring 32 to achieve the splicing of the standard section casing 3. The rotary drilling rig 1 then uses the drill rod 11 to rotate and press the standard section casing 3 down into the pile hole 5.

[0076] Reference Figure 7 The pile hole 5, the first bearing platform 41 and the second bearing platform 42 are located on the same arc line, and the arc line is located on the rotation center of the rotary drilling rig. The placement cylinder 431 on the third bearing platform 43, which is close to the second bearing platform 42, is also located on the same arc line. The rotary drilling rig 1 can control the rotation of the drill rod 11 to carry out the processes of drilling, disassembling the drill bit 12, installing the drill bit 12, disassembling the casing connector 2, installing the casing connector 2 and extracting the casing without moving the position of the rotary drilling rig 1, thereby improving the efficiency of the cast-in-place pile construction.

[0077] The implementation principle of the full casing follow-up process for bored piles using a rotary drilling rig in this application embodiment is as follows: After the rotary drilling rig 1 performs one drilling operation, the drill bit 12 is removed from the first support platform 41, the casing connector 2 is installed on the second support platform 42, the casing is extracted from the third support platform 43, and then the casing is spliced ​​with the pile hole 5. The casing is then rotated and pressed down to ensure full casing supply during the drilling process, thereby reducing the possibility of collapse of the inner wall of the pile hole 5 and ground cracks, thus reducing mud loss and concrete consumption, reducing maintenance costs, lowering construction costs, and ensuring construction safety.

[0078] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0079] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A process for following up with a full casing on bored cast-in-place piles using a rotary drilling rig, characterized in that: Includes the following steps: S1. Clear obstacles, level the site, use a total station to lay out the site, and determine the stake points; S2. Construct a support platform (4) near the pile point. The support platform (4) is used to support the bottom section casing, the standard section casing (3), the drill bit (12) and the casing connector (2). S3. Use a rotary drilling rig (1) to drill to a depth of 1m at the pile point; S4. After lifting the drill rod (11), remove the drill bit (12), install the casing connector (2) on the drill rod (11), and connect the casing connector (2) to the bottom casing. Rotate and press the bottom casing into the pile hole (5) through the drill rod (11). When the bottom casing enters the pile hole (5) to a depth of 0.5m, use a level to check the verticality of the bottom casing. S5. Use rotary drilling rig (1) to continue drilling 3m into pile hole (5); S6. After lifting the drill rod (11), remove the drill bit (12), install the casing connector (2) on the drill rod (11), and connect the casing connector (2) to the standard casing section (3). Connect the standard casing section (3) to the bottom casing section through the drill rod (11), lock the standard casing section (3) to the bottom casing section, rotate and press the bottom casing section into the pile hole (5) through the drill rod (11), and when the bottom casing section enters the pile hole (5) to a depth of 1.5m, use a level to check the verticality of the bottom casing section. S7. Repeat steps S5 and S6 until the designed depth of the pile hole (5) is reached; S8. Fabricate, hoist and install the steel cage, connect the guide pipe and lower the guide pipe into the pile hole (5); S9. Pour concrete into the pile hole (5); S10. After the concrete pouring is completed, remove the standard section casing (3) and the bottom section casing. The support platform (4) is provided with a first support platform (41), a second support platform (42) and a third support platform (43). The first support platform (41) is used to support the drill bit (12), the second support platform (42) is used to support the casing connector (2), and the third support platform (43) is used to support the bottom section casing and multiple standard section casings (3). The first support platform (41), the second support platform (42) and the third support platform (43) are all rotatably connected to the support platform (4). The third support platform (43) is provided with a plurality of placement cylinders (431). The placement cylinders (431) are used to place bottom section protective cylinders or standard section protective cylinders (3). The placement cylinders (431) are rotatably connected to the third support platform (43). The plurality of placement cylinders (431) are distributed around the rotation axis of the third support platform (43). The first bearing platform (41), the second bearing platform (42), the pile hole (5) and one of the placement cylinders (431) can be located on the same arc trajectory, and the center of the arc is on the rotation axis of the rotary drilling rig (1); The standard section sleeve (3) is provided with an inner connecting ring (31) on the top and an outer connecting ring (32) on the bottom. The bottom section sleeve is provided with an inner connecting ring (31) on the top. The inner connecting ring (31) and the outer connecting ring (32) are provided with the same number and size of threaded holes (311). The outer diameter of the inner connecting ring (31) is the same as the inner diameter of the outer connecting ring (32). The inner connecting ring (31) can be inserted into the outer connecting ring (32). The inner connecting ring (31) is provided with a plurality of positioning blocks (312), and the outer connecting ring (32) is provided with a plurality of first positioning grooves (321). The positions and shapes of the first positioning grooves (321) and the positioning blocks (312) are adapted to each other, and one first positioning groove (321) corresponds to one positioning block (312).

2. The process for follow-up installation of full casing for bored piles using a rotary drilling rig according to claim 1, characterized in that: Both the drill bit (12) and the casing connector (2) are inserted into the drill rod (11) and locked by a pin (212).

3. The process for follow-up installation of full casing for bored piles using a rotary drilling rig according to claim 2, characterized in that: The sleeve connector (2) includes a mounting part (21) and a connecting sleeve (22). The drill rod (11) is inserted into the mounting part (21). The connecting sleeve (22) can be inserted into the inner connecting ring (31). The connecting sleeve (22) has multiple second positioning grooves (221). The second positioning grooves (221) are adapted to the position and shape of the positioning block (312). One second positioning groove (221) corresponds to one positioning block (312). The connecting sleeve (22) has multiple threaded holes (311) of the same number and size as the inner connecting ring (31).

4. The process for follow-up installation of full casing for bored piles using a rotary drilling rig according to claim 3, characterized in that: The connecting cylinder (22) is provided with a locking component (23), which is used to lock the connecting cylinder (22) and the inner connecting ring (31). The locking component (23) is electrically driven.

5. The process for follow-up installation of full casing for bored piles using a rotary drilling rig according to claim 4, characterized in that: The locking assembly (23) includes a locking bolt (231), a driven gear (232), a drive pinion (233), and a drive motor (234). The locking bolt (231) is threadedly connected to the connecting cylinder (22). One end of the locking bolt (231) can pass through the connecting cylinder (22) and be threadedly connected to the inner connecting ring (31). The other end is coaxially fixedly connected to the driven gear (232). The drive pinion (233) is rotatably connected to the connecting cylinder (22). The driven gear (232) meshes with the drive pinion (233) and is slidably connected to the drive pinion (233). The drive motor (234) is mounted on the connecting cylinder (22) and is used to drive the drive pinion (233) to rotate.

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