Rotary drilling hole-forming high-pressure jet grouting bottom-expanding cast-in-place pile and using method

Abstract

The invention relates to a rotary digging hole-forming high-pressure rotary spraying bottom-expanding cast-in-place pile and a using method, and belongs to the technical field of cast-in-place piles. The rotary digging hole-forming high-pressure rotary spraying bottom-expanding cast-in-place pile comprises a pile hole, a cast-in-place pile body is arranged in the pile hole, a bottom plate is fixedly installed at the bottom in the pile hole, and a base is fixedly connected to the center of the top of the bottom plate; arc-shaped supporting plates are arranged at the positions, close to the bottom, of the two sides of the cast-in-place pile body correspondingly, and side end plates are fixedly connected to the two sides, corresponding to the two sides of the base, of the top of the bottom plate correspondingly. According to the rotary digging hole-forming high-pressure rotary spraying expanded-base cast-in-place pile and the using method thereof, controllable expansion of the bottom of the cast-in-place pile body is achieved by introducing the combination of the two-way threaded rod and the arc-shaped supporting plate, a firm expanded-base structure is formed, the contact area between the pile and a soil body is effectively increased through the structure, the bearing capacity and the anti-settling capacity of the pile bottom are remarkably improved, and the construction period is shortened. The arc-shaped supporting plates are fixedly connected through the two-way threaded rods, so that the stability and integrity of the expanded base structure are ensured, and the expanded base structure can bear larger vertical load and horizontal force.

Description

Technical Field

[0001] This invention belongs to the field of cast-in-place pile technology, specifically relating to a rotary drilling high-pressure jet grouting expanded-base cast-in-place pile and its application method. Background Technology

[0002] Cast-in-place piles are piles made by drilling holes in place and pouring in concrete or reinforced concrete. They are often used to reinforce construction areas with poor geological conditions.

[0003] High-pressure jet grouting piles use high-pressure rotating nozzles to inject cement grout into the soil layer and mix it with the soil to form a continuous, overlapping cement-reinforced structure. Construction requires less land, produces less vibration, and generates less noise.

[0004] Traditional rotary-drilled cast-in-place piles typically employ a flat or simply enlarged head design at the pile bottom. When dealing with deep soft soil layers, karst areas, or highly compressible soil layers, they often fail to provide sufficient bearing capacity. Insufficient pile bottom bearing capacity directly leads to excessive settlement of the superstructure, affecting the overall stability and safety of the structure. This is particularly true in high-rise buildings, where the bearing capacity requirements for pile foundations increase with the number of stories, a requirement that traditional cast-in-place piles struggle to meet. (Invention Content)

[0005] The technical problem to be solved by the present invention is to provide a rotary drilling high-pressure jet grouting expanded-base cast-in-place pile and its usage method to solve some of the problems mentioned in the background art or achieve better technical effects.

[0006] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention. This invention discloses a rotary-drilled high-pressure jet grouting expanded-base cast-in-place pile, including a pile hole, inside which a cast-in-place pile body is disposed. A base plate is fixedly installed at the bottom of the pile hole, and a base is fixedly connected to the center of the top of the base plate. Arc-shaped support plates are disposed on both sides of the cast-in-place pile body near the bottom. Side end plates are fixedly connected to both sides of the top of the base plate corresponding to both sides of the base. Connecting plates are disposed on opposite sides of the two arc-shaped support plates. Load-bearing seats are fixedly connected to both sides of the top of the base plate corresponding to the opposite sides of the two side end plates. A movable groove is formed near the top of the side end plate, and a movable column is slidably connected inside the movable groove. One side of the moving column is fixedly connected to the connecting plate. Two movable grooves are provided on the inner side of the opposite end of the two arc-shaped support plates. A sliding block is provided inside the movable groove. Limiting grooves are provided on the front and rear sides of the movable grooves corresponding to the two movable grooves. The front and rear sides of the sliding block pass through the two limiting grooves and are slidably connected to them. An extension plate is fixedly connected between the two sliding blocks in the two movable grooves. Threaded grooves are provided on the outer side of the opposite end of the two arc-shaped support plates. A two-way threaded rod is threaded between the two threaded grooves. Nuts are threaded on both sides of the two-way threaded rod. The opposite side of the two nuts is fixedly connected to the opposite end of the two arc-shaped support plates.

[0007] Preferably, each of the four corners of one end of the connecting plate is threaded with a fixing bolt. One side of the fixing bolt penetrates into the interior of the arc-shaped support plate and is threadedly connected to the arc-shaped support plate. The other side of the movable column penetrates into the exterior of the side end plate and is fixedly connected with a limit plate.

[0008] Preferably, the top of the base has movable slots on both sides, a support rod is fixedly connected to the center of the movable slot, a movable plate is slidably connected inside the movable slot, the movable plate is sleeved and slidably connected to the support rod, a positioning slot is opened at the center of the top of the movable plate, and a positioning block is fixedly connected to the bottom of the arc-shaped support plate, the bottom of the positioning block penetrates into the interior of the positioning slot and engages with the positioning slot.

[0009] Preferably, a magnetic block is fixedly connected to the bottom of the positioning groove, and an iron sheet is fixedly connected to the bottom of the positioning block. The bottom of the iron sheet is magnetically connected to the top of the magnetic block.

[0010] Preferably, a support spring is sleeved on the outer side of the movable column, and the two sides of the support spring are fixedly connected to the side end plate and the connecting plate, respectively.

[0011] Preferably, a knob is fixedly connected to one side of the bidirectional threaded rod, and a limiting spring is sleeved between the two arc-shaped support plates on the outer side of the bidirectional threaded rod, with the two ends of the limiting spring contacting the opposite sides of the two arc-shaped support plates respectively.

[0012] This invention also discloses a method for using rotary drilling high-pressure jet grouting expanded-base cast-in-place piles, comprising the following steps:

[0013] Step 1: Use a rotary drilling rig to excavate the pile hole, ensuring that the depth and diameter of the pile hole meet the requirements. Install the base plate at the bottom of the pile hole using a fixed method, ensuring that the base plate is stable and does not shake. Fix the base at the center of the top of the base plate to prepare for the support of the subsequent cast-in-place pile body. Place two arc-shaped support plates on both sides of the cast-in-place pile body near the bottom, ready to connect with the structure on the base plate. Fix the side end plates on both sides of the top of the base plate, corresponding to the two sides of the base, to provide a support frame for the arc-shaped support plates.

[0014] Step 2: Install connecting plates on opposite sides of the two arc-shaped support plates and use fixing bolts to secure the connecting plates to the arc-shaped support plates. Slide the movable column through the movable groove on the side end plate and ensure that a limit plate is fixedly connected to the other side of the movable column to prevent the movable column from completely coming off.

[0015] Step 3: Adjust the position of the moving plate by sliding it along the support rod in the moving groove so that the positioning groove is aligned with the positioning block at the bottom of the arc-shaped support plate. Use the magnetic connection between the magnetic block and the iron sheet to make the positioning block firmly inserted into the positioning groove, thus achieving the initial positioning of the arc-shaped support plate.

[0016] Step four: Threaded grooves are made on the outer side of the opposite ends of the two arc-shaped support plates. A double-threaded rod is then passed through the two threaded grooves, and nuts are tightened on both sides to ensure that the double-threaded rod is firmly connected to the two arc-shaped support plates. Rotating the knob causes the double-threaded rod to rotate. As the two arc-shaped support plates move towards each other, the bottom of the cast-in-place pile body expands outward, forming an enlarged base structure. Sliding blocks are installed in the movable grooves of the two arc-shaped support plates, and the sliding blocks are made to slide smoothly by limiting the sliding grooves. An extension plate is used to connect the two sliding blocks. With the adjustment of the double-threaded rod, the extension plate will enhance the stability and load-bearing capacity of the enlarged base structure.

[0017] Step 5: Install a support spring on the outside of the movable column and ensure that its two ends are fixedly connected to the side end plate and the connecting plate respectively to provide additional elastic support. On the outside of the bidirectional threaded rod, install a limiting spring between the two arc-shaped support plates to ensure that the arc-shaped support plates can move smoothly and evenly during the adjustment of the bidirectional threaded rod.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This rotary-drilled high-pressure jet grouting expanded-base cast-in-place pile achieves controllable expansion of the pile body's bottom through the introduction of a combination of bidirectional threaded rods and arc-shaped support plates, forming a robust expanded-base structure. This structure effectively increases the contact area between the pile and the soil, significantly improving the pile's bearing capacity and anti-settlement ability. The arc-shaped support plates, securely connected by bidirectional threaded rods, ensure the stability and integrity of the expanded-base structure, enabling it to withstand greater vertical loads and horizontal forces, and adapting to the needs of high-rise buildings and complex geological conditions. By rotating the bidirectional threaded rods via a knob, the relative movement distance of the arc-shaped support plates can be precisely controlled, thus achieving precise control of the expanded-base dimensions. This control method effectively avoids the problem of uneven diameter expansion in traditional methods, improving the overall stability of the pile body. The support springs on the outside of the movable column and the limit springs on the outside of the bidirectional threaded rods provide additional elastic support and buffer protection, effectively reducing impact and vibration during adjustment, protecting the pile body and surrounding soil from damage, and improving safety during construction. Connecting two sliding blocks through an extension plate enhances the overall strength and rigidity of the expanded-base structure, enabling it to better resist deformation and damage under long-term loads. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 For the present invention Figure 1 A magnified view of part A in the diagram;

[0023] Figure 3 This is a top view cross-sectional diagram of the arc-shaped support plate of the present invention.

[0024] Figure 4 For the present invention Figure 3 A magnified view of part B in the diagram;

[0025] Figure 5 This is a three-dimensional structural view of the base of the present invention;

[0026] Figure 6 This is a three-dimensional view of the arc-shaped support plate of the present invention.

[0027] In the diagram: 1. Pile hole; 2. Cast-in-place pile body; 3. Base plate; 4. Base; 5. Side end plate; 6. Moving groove; 7. Arc-shaped support plate; 8. Support rod; 9. Moving plate; 10. Positioning groove; 11. Magnetic block; 12. Positioning block; 13. Iron sheet; 14. Load-bearing seat; 15. Moving groove one; 16. Moving column; 17. Connecting plate; 18. Support spring; 19. Fixing bolt; 20. Limiting plate; 21. Moving groove two; 22. Limiting slide groove; 23. Sliding block; 24. Extension plate; 25. Threaded groove; 26. Two-way threaded rod; 27. Limiting spring; 28. Nut; 29. ​​Knob. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] Please see Figure 1-6 A rotary-drilled high-pressure jet grouting enlarged-base cast-in-place pile includes a pile hole 1, a cast-in-place pile body 2 disposed inside the pile hole 1, a base plate 3 fixedly installed at the bottom inside the pile hole 1, a base 4 fixedly connected to the center of the top of the base plate 3, arc-shaped support plates 7 disposed on both sides near the bottom of the cast-in-place pile body 2, side end plates 5 fixedly connected to both sides of the top of the base plate 3 corresponding to both sides of the base 4, a connecting plate 17 disposed on the opposite side of the two arc-shaped support plates 7, a load-bearing seat 14 fixedly connected to both sides of the top of the base plate 3 corresponding to the opposite side of the two side end plates 5, a movable groove 15 opened near the top of the side end plates 5, a movable column 16 slidably connected inside the movable groove 15, one side of the movable column 16 fixedly connected to the connecting plate 17, and the inner side of the opposite end of the two arc-shaped support plates 7 Each side has a movable groove 21, and a sliding block 23 is provided inside the movable groove 21. The front and rear sides of the arc-shaped support plate 7 are respectively provided with limiting grooves 22. The front and rear sides of the sliding block 23 pass through the interior of the two limiting grooves 22 and are slidably connected to the limiting grooves 22. An extension plate 24 is fixedly connected between the two sliding blocks 23 provided in the two movable grooves 21 on the left and right. A threaded groove 25 is provided on the outer side of the opposite end of the two arc-shaped support plates 7. A two-way threaded rod 26 is threadedly connected between the two threaded grooves 25 on the left and right. Nuts 28 are threadedly connected on both sides of the two-way threaded rod 26. The opposite side of the two nuts 28 is fixedly connected to the opposite end of the two arc-shaped support plates 7.

[0032] Each of the four corners of one end of the connecting plate 17 is threaded with a fixing bolt 19. One side of the fixing bolt 19 extends into the interior of the arc-shaped support plate 7 and is threadedly connected to the arc-shaped support plate 7. The other side of the movable column 16 extends into the exterior of the side end plate 5 and is fixedly connected with a limit plate 20.

[0033] The top of the base 4 has movable grooves 6 on both sides. A support rod 8 is fixedly connected to the center of the movable groove 6. A movable plate 9 is slidably connected inside the movable groove 6. The movable plate 9 is sleeved and slidably connected to the support rod 8. A positioning groove 10 is opened at the center of the top of the movable plate 9. A positioning block 12 is fixedly connected to the bottom of the arc-shaped support plate 7. The bottom of the positioning block 12 penetrates into the interior of the positioning groove 10 and engages with the positioning groove 10.

[0034] A magnetic block 11 is fixedly connected to the bottom of the positioning groove 10, and an iron sheet 13 is fixedly connected to the bottom of the positioning block 12. The bottom of the iron sheet 13 is magnetically connected to the top of the magnetic block 11.

[0035] A support spring 18 is fitted on the outside of the movable column 16, and the two sides of the support spring 18 are fixedly connected to the side end plate 5 and the connecting plate 17, respectively.

[0036] A knob 29 is fixedly connected to one side of the bidirectional threaded rod 26. A limiting spring 27 is sleeved between the two arc-shaped support plates 7 on the outer side of the bidirectional threaded rod 26. The two ends of the limiting spring 27 are in contact with the opposite sides of the two arc-shaped support plates 7, respectively.

[0037] Example 2

[0038] A method for using rotary drilling high-pressure jet grouting expanded-base cast-in-place piles includes the following steps:

[0039] Step 1: Use a rotary drilling rig to excavate pile hole 1, ensuring that the depth and diameter of pile hole 1 meet the requirements. Install the base plate 3 at the bottom of pile hole 1 by fixing it in place, ensuring that the base plate 3 is stable and does not shake. Fix the base 4 at the center of the top of the base plate 3 to prepare for the support of the subsequent cast-in-place pile body 2. Place two arc-shaped support plates 7 on both sides of the bottom of the cast-in-place pile body 2, ready to connect with the structure on the base plate 3. Fix the side end plates 5 on both sides of the top of the base plate 3, corresponding to the two sides of the base 4, to provide a support frame for the arc-shaped support plates 7.

[0040] Step 2: Install connecting plates 17 on opposite sides of the two arc-shaped support plates 7, and use fixing bolts 19 to fasten the connecting plates 17 to the arc-shaped support plates 7. Slide the movable column 16 through the movable groove 15 on the side end plate 5, and ensure that the other side of the movable column 16 is fixedly connected to the limit plate 20 to prevent the movable column 16 from completely coming off.

[0041] Step 3: The position of the moving plate 9 is adjusted by sliding the moving plate 9 along the support rod 8 in the moving groove 6, so that the positioning groove 10 is aligned with the positioning block 12 at the bottom of the arc-shaped support plate 7. The magnetic connection between the magnetic block 11 and the iron sheet 13 is used to make the positioning block 12 firmly inserted into the positioning groove 10, thus achieving the initial positioning of the arc-shaped support plate 7.

[0042] Step four: Threaded grooves 25 are made on the outer side of the opposite ends of the two arc-shaped support plates 7, and a double-threaded rod 26 is passed through the two threaded grooves 25. Nuts 28 are tightened on both sides to ensure that the double-threaded rod 26 is firmly connected to the two arc-shaped support plates 7. Rotating the knob 29 drives the double-threaded rod 26 to rotate. As the two arc-shaped support plates 7 move towards each other, the bottom of the cast-in-place pile body 2 expands outward to form an enlarged bottom structure. Sliding blocks 23 are installed in the movable grooves 21 of the two arc-shaped support plates 7, and the sliding blocks 23 are made to slide smoothly by the limiting grooves 22. The two sliding blocks 23 are connected by an extension plate 24. With the adjustment of the double-threaded rod 26, the extension plate 24 will enhance the stability and load-bearing capacity of the enlarged bottom structure.

[0043] Step 5: Install a support spring 18 on the outside of the movable column 16 and ensure that its two ends are fixedly connected to the side end plate 5 and the connecting plate 17 respectively to provide additional elastic support. On the outside of the bidirectional threaded rod 26, install a limiting spring 27 between the two arc-shaped support plates 7 to ensure that the arc-shaped support plates 7 can move smoothly and evenly during the adjustment of the bidirectional threaded rod 26.

[0044] This application describes a rotary-drilled high-pressure jet grouting pile with expanded base. By introducing a combination of a bidirectional threaded rod 26 and an arc-shaped support plate 7, controllable expansion of the bottom of the pile body 2 is achieved, forming a robust expanded base structure. This structure effectively increases the contact area between the pile and the soil, significantly improving the bearing capacity and settlement resistance of the pile bottom. The arc-shaped support plate 7, securely connected by the bidirectional threaded rod 26, ensures the stability and integrity of the expanded base structure, enabling it to withstand greater vertical loads and horizontal forces, thus meeting the needs of high-rise buildings and complex geological conditions. The arc-shaped support plate 7 can be precisely controlled by rotating the knob 29 to drive the bidirectional threaded rod 26. The opposing movement distance enables precise control of the enlarged base size. This control method effectively avoids the problem of uneven enlargement in traditional methods and improves the overall stability of the pile body. The support spring 18 on the outside of the movable column 16 and the limiting spring 27 on the outside of the bidirectional threaded rod 26 provide additional elastic support and buffer protection. During the adjustment process, it can effectively reduce impact and vibration, protect the pile body and surrounding soil from damage, and improve the safety during construction. The extension plate 24 connects the two sliding blocks 23, which enhances the overall strength and rigidity of the enlarged base structure, enabling it to better resist deformation and damage under long-term load.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rotary-drilled high-pressure jet grouting expanded-base cast-in-place pile, comprising a pile hole (1), characterized in that: The pile hole (1) is equipped with a cast-in-place pile body (2). A base plate (3) is fixedly installed at the bottom of the pile hole (1). A base (4) is fixedly connected to the center of the top of the base plate (3). Arc-shaped support plates (7) are provided on both sides of the bottom of the cast-in-place pile body (2). Side end plates (5) are fixedly connected to both sides of the top of the base plate (3) corresponding to both sides of the base (4). A connecting plate (17) is provided on the opposite side of the two arc-shaped support plates (7). A load-bearing seat (14) is fixedly connected to both sides of the top of the base plate (3) corresponding to the opposite side of the two side end plates (5). The side end plates (5) are fixedly connected to the top of the base plate (3). A movable groove (15) is provided at the part position. A movable column (16) is slidably connected inside the movable groove (15). One side of the movable column (16) is fixedly connected to the connecting plate (17). A movable groove (21) is provided on the inner side of the opposite end of the two arc-shaped support plates (7). A sliding block (23) is provided inside the movable groove (21). A limiting groove (22) is provided on the front and rear sides of the arc-shaped support plate (7) corresponding to the movable groove (21). The front and rear sides of the sliding block (23) respectively penetrate into the interior of the two limiting grooves (22) and are slidably connected to the limiting grooves (22).

2. The rotary drilling high-pressure jet grouting expanded-base cast-in-place pile according to claim 1, characterized in that: An extension plate (24) is fixedly connected between two sliding blocks (23) set in the two movable slots (21) on the left and right sides. Threaded grooves (25) are opened on the outer side of the opposite end of the two arc-shaped support plates (7). A two-way threaded rod (26) is threaded between the two threaded grooves (25) on the left and right sides. Nuts (28) are threaded on both sides of the two-way threaded rod (26). The opposite side of the two nuts (28) is fixedly connected to the opposite end of the two arc-shaped support plates (7).

3. The rotary drilling high-pressure jet grouting expanded-base cast-in-place pile according to claim 2, characterized in that: The four corners of one end of the connecting plate (17) are threaded with fixing bolts (19). One side of the fixing bolt (19) penetrates into the interior of the arc-shaped support plate (7) and is threadedly connected to the arc-shaped support plate (7). The other side of the movable column (16) penetrates into the exterior of the side end plate (5) and is fixedly connected with the limit plate (20).

4. The rotary drilling high-pressure jet grouting expanded-base cast-in-place pile according to claim 3, characterized in that: The base (4) has movable grooves (6) on both sides of its top. A support rod (8) is fixedly connected to the center of the movable groove (6). A movable plate (9) is slidably connected inside the movable groove (6). The movable plate (9) is sleeved and slidably connected to the support rod (8). A positioning groove (10) is opened at the center of the top of the movable plate (9). A positioning block (12) is fixedly connected to the bottom of the arc-shaped support plate (7). The bottom of the positioning block (12) penetrates into the interior of the positioning groove (10) and engages with the positioning groove (10).

5. A rotary-drilled high-pressure jet grouting expanded-base cast-in-place pile according to claim 4, characterized in that: A magnetic block (11) is fixedly connected to the bottom of the positioning groove (10), and an iron sheet (13) is fixedly connected to the bottom of the positioning block (12). The bottom of the iron sheet (13) is magnetically connected to the top of the magnetic block (11).

6. A rotary-drilled high-pressure jet grouting expanded-base cast-in-place pile according to claim 5, characterized in that: A support spring (18) is sleeved on the outside of the movable column (16), and the two sides of the support spring (18) are fixedly connected to the side end plate (5) and the connecting plate (17) respectively.

7. A rotary-drilled high-pressure jet grouting expanded-base cast-in-place pile according to claim 6, characterized in that: A knob (29) is fixedly connected to one side of the bidirectional threaded rod (26). A limiting spring (27) is sleeved between the two arc-shaped support plates (7) on the outer side of the bidirectional threaded rod (26). The two ends of the limiting spring (27) are respectively in contact with the opposite side of the two arc-shaped support plates (7).

8. The method of using a rotary drilling high-pressure jet grouting expanded-base cast-in-place pile according to claim 7, characterized in that, Includes the following steps: Step 1: Use a rotary drilling rig to excavate the pile hole (1) to ensure that the depth and diameter of the pile hole (1) meet the requirements. Install the base plate (3) at the bottom of the pile hole (1) by fixing it to ensure that the base plate (3) is stable and does not shake. Fix the base (4) at the center of the top of the base plate (3) to prepare for the support of the subsequent cast-in-place pile body (2). Place two arc-shaped support plates (7) on the bottom side of the cast-in-place pile body (2) to prepare for connection with the structure on the base plate (3). Fix the side end plates (5) on the top side of the base plate (3) corresponding to the two sides of the base (4) to provide a support frame for the arc-shaped support plates (7). Step 2: Install connecting plates (17) on the opposite sides of the two arc-shaped support plates (7), and use fixing bolts (19) to fasten the connecting plates (17) to the arc-shaped support plates (7). Slide the movable column (16) through the movable groove (15) on the side end plate (5), and ensure that the other side of the movable column (16) is fixedly connected to the limit plate (20) to prevent the movable column (16) from completely coming out. Step 3: The position of the moving plate (9) is adjusted by sliding the moving plate (9) along the support rod (8) in the moving groove (6) so that the positioning groove (10) is aligned with the positioning block (12) at the bottom of the arc-shaped support plate (7). The magnetic block (11) and the iron sheet (13) are connected by magnetic force so that the positioning block (12) is firmly inserted into the positioning groove (10) to achieve the initial positioning of the arc-shaped support plate (7).

9. The method of using a rotary-drilled high-pressure jet grouting expanded-base cast-in-place pile according to claim 8, characterized in that, Includes the following steps: Step 4: Open threaded grooves (25) on the outer side of the opposite end of the two arc-shaped support plates (7), and use a double-threaded rod (26) to pass through the two threaded grooves (25). Tighten nuts (28) on both sides to ensure that the double-threaded rod (26) is firmly connected to the two arc-shaped support plates (7). Turn the knob (29) to drive the double-threaded rod (26) to rotate. As the two arc-shaped support plates (7) will move towards each other, push the bottom of the grouting pile body (2) to expand outward to form an enlarged bottom structure. Install sliding blocks (23) in the two arc-shaped support plates (7) respectively in the movable groove (21), and ensure the smooth sliding of the sliding blocks (23) through the limiting sliding groove (22). Use an extension plate (24) to connect the two sliding blocks (23). With the adjustment of the double-threaded rod (26), the extension plate (24) will enhance the stability and bearing capacity of the enlarged bottom structure. Step 5: Install a support spring (18) on the outside of the movable column (16) and ensure that its two ends are fixedly connected to the side end plate (5) and the connecting plate (17) respectively to provide additional elastic support. On the outside of the double-threaded rod (26), install a limiting spring (27) between the two arc-shaped support plates (7) to ensure that the arc-shaped support plates (7) can move smoothly and evenly during the adjustment of the double-threaded rod (26).

Images