A high-pressure jet grouting pile machine and its construction method

Abstract

This application relates to a high-pressure jet grouting pile machine and its construction method, belonging to the field of building construction technology. The high-pressure jet grouting pile machine includes a frame, a drill rod sliding on and off the frame, a drive device for driving the drill rod to move up and down, and a power device for driving the drill rod to rotate. The drill rod includes a first drill rod and a second drill rod, with the second drill rod sleeved outside the first drill rod. A positioning ring is coaxially fixed to the lower end of the first drill rod, and the positioning ring is threadedly connected to the inner wall of the second drill rod. A fixing ring is fixed to the upper end face of the second drill rod to prevent the positioning ring from detaching from the second drill rod. This application has the advantage of eliminating the need to replace the drill rod during deep hole drilling.

Description

Technical Field

[0001] This application relates to the field of construction equipment technology, and in particular to a high-pressure jet grouting pile machine and its construction method. Background Technology

[0002] High-pressure jet grouting piles are constructed by injecting cement grout into the soil layer through a high-pressure rotating nozzle, mixing it with the soil to form a continuously overlapping cement-reinforced structure. In modern high-rise building and subway projects, pile drivers are essential equipment, and high-pressure jet grouting piles are primarily constructed using long-auger pile drivers.

[0003] During use, the long spiral pile driver drills a hole to the required depth by lowering the drill rod, and then uses a concrete pump to send concrete into the hole to form the required pile.

[0004] The inventors discovered that although it can meet the requirements for pile foundation work in high-rise buildings and subway projects, it has shortcomings: it cannot drill to the bottom in one go, and the drill rod needs to be connected frequently during the drilling process. When pulling it out, the drill rod also needs to be disassembled section by section, which is labor-intensive and time-consuming, and the labor intensity of the operators is also very high. Moreover, the pile foundation can only be poured after all the drill rods have been pulled out, and the poured concrete cannot be compacted, resulting in unstable pile foundation quality. Summary of the Invention

[0005] To eliminate the need to replace drill rods during deep hole drilling, this application provides a high-pressure jet grouting pile machine and its construction method.

[0006] The high-pressure jet grouting pile machine provided in this application adopts the following technical solution:

[0007] A high-pressure jet grouting pile machine includes a frame, a drill rod sliding on and off the frame, a drive device for driving the drill rod to move up and down, and a power device for driving the drill rod to rotate. The drill rod includes a first drill rod and a second drill rod. The second drill rod is sleeved outside the first drill rod. A positioning ring is coaxially fixed at the lower end of the first drill rod. The positioning ring is threadedly connected to the inner wall of the second drill rod. A fixing ring is fixed on the upper end face of the second drill rod to prevent the positioning ring from detaching from the second drill rod.

[0008] By adopting the above technical solution, the jet grouting machine is moved to the designated position, and then acts on the drive device and power device to make the second drill rod move downward and drill a hole. During the drilling process, the total length of the second drill rod and the second drill pipe increases to meet the needs of drilling holes of different depths.

[0009] Optionally, the frame is provided with a mounting frame, the drive device includes a drive screw rotatably connected to the frame, the drive screw passes through the mounting frame and is threadedly connected to the mounting frame, a drive motor for driving the drive screw to rotate is fixed on the frame, the drill rod is rotatably connected to the mounting frame, and the power device is provided on the mounting frame.

[0010] By adopting the above technical solution, the drive motor drives the drive screw to rotate, and the drive screw drives the mounting frame threaded on the drive screw and the power device connected to the mounting frame to move up and down.

[0011] Optionally, the power unit includes a driven pulley fixed to the outer wall of the upper end of the first drill rod, a power motor fixed on the mounting frame, a main pulley fixed on the output shaft of the power motor, and a power belt connected to the driven pulley on the main pulley.

[0012] By adopting the above technical solution, the power motor drives the driven pulley to rotate through the power belt, thereby driving the first drill rod to rotate. At the same time, under the action of the drive device, the first drill rod and the second drill rod drill holes in the ground.

[0013] Optionally, the lower end of the second drill rod is open, and a dredging device is provided inside the drill rod to discharge soil from the upper end of the first drill rod. The dredging device includes two first spiral shafts rotatably connected to the mounting frame and passing through the first drill rod. The outer wall of the first spiral shaft is fixed with a first spiral blade. The two first spiral shafts are connected by meshing gears. A dredging motor that drives one of the first spiral shafts to rotate is fixed on the mounting frame. The dredging device also includes a dredging mechanism disposed inside the second drill rod and used to send the soil inside the second drill rod to the upper first drill rod.

[0014] By adopting the above technical solution, the soil enters the first and second drill rods and moves upward under the action of the first spiral blade and the dredging mechanism, which facilitates the removal of the soil.

[0015] Optionally, the dredging mechanism includes a second spiral shaft rotatably connected inside the second drill rod, a second spiral blade fixed to the outer wall of the second spiral shaft, and an opening at the upper end of the second spiral shaft for receiving two first spiral blades. The dredging mechanism also includes a dredging component that drives the second spiral shaft to rotate, and a mud discharge port is provided at the upper end of the first drill rod.

[0016] By adopting the above technical solution, the soil enters the second drill pipe and is transported upward by the action of the second spiral blade, and then sent into the first drill pipe. After being acted upon by the first spiral blade, the soil is discharged from the upper mud discharge port.

[0017] Optionally, the dredging assembly includes a toothed ring slidably disposed within a second spiral shaft. A synchronization groove is formed on the inner wall of the second spiral shaft along its length. A synchronization block is fixed on the outer wall of the toothed ring and slidably disposed within the synchronization groove. A disc connecting two first spiral shafts is rotatably connected to the lower end of the first spiral shaft. The disc is used to close the upper opening of the second spiral shaft and is rotatably connected to the toothed ring. One of the first spiral shafts passes through the disc and has a drive gear fixed at its lower end. The drive gear meshes with the inner teeth of the toothed ring.

[0018] By adopting the above technical solution, the first spiral shaft drives the drive gear to rotate, the drive gear drives the gear ring to rotate, thereby driving the second spiral shaft to rotate. In the initial stage, the soil may push the second spiral shaft upward. In the later drilling process, the second spiral blades gradually transport the soil upward and into the first drill rod, so that the first spiral blades can discharge the soil.

[0019] Optionally, a concrete pump and an air compressor are fixed on the frame, and a feeding pipe is connected to the concrete pump and the air compressor. The two feeding pipes pass through the two first spiral shafts and extend to the lower end of the second spiral shaft. The feeding pipes are rotatably connected to the first spiral shafts, and a switching mechanism is provided at the lower end of the second spiral shaft to facilitate the flow of concrete.

[0020] By adopting the above technical solution, under the action of air compressor and concrete pump, concrete is fed into the second spiral shaft through the feeding pipe and discharged from the switching mechanism to form a pile in the borehole.

[0021] Optionally, the switching mechanism includes an abutment drill bit that slides within a second spiral shaft, an anti-detachment ring fixed at the lower end of the second spiral shaft to prevent the abutment drill bit from detaching from the second spiral shaft, a discharge hole for facilitating concrete flow out on the abutment drill bit, an abutment spring fixed within the second spiral shaft to push the abutment drill bit against the anti-detachment ring, and a blocking rod fixed within the second spiral shaft to block the discharge hole during drilling.

[0022] By adopting the above technical solution, during the drilling stage, the soil pushes the abutting drill bit upward, and the blocking rod blocks the discharge hole to prevent soil from entering the second spiral shaft. As the second drill rod moves upward, the abutting spring drives the abutting drill bit downward, opening the discharge hole and facilitating the flow of concrete.

[0023] On the other hand, this application also provides a construction method using the above-mentioned high-pressure jet grouting machine, including the following steps:

[0024] S1. The jet grouting pile foundation is moved to the designated position, the second drill rod abuts the ground, the power device drives the first drill rod to rotate, the second drill rod moves downward, and at the same time, the second drill rod moves outward relative to the first drill rod until the drill rod is extended to its longest position, and the two drill rods rotate synchronously.

[0025] S2. During the drilling process, the soil enters the second drill rod and is discharged from the upper mud discharge port under the action of the second and first spiral blades.

[0026] S3. During the drilling process, the discharge hole is closed, the first drill rod rotates in the opposite direction, the second drill rod moves upward, the discharge hole opens, and the concrete is discharged from the discharge hole and formed inside the drill hole.

[0027] S4. The drive motor drives the mounting frame and drill rod to move upward, completing the entire drilling and grouting process.

[0028] By adopting the above technical solution, during the drilling process, the second drill rod moves relative to the first drill rod, so that a deep hole can be drilled without replacing the drill rod. Soil is discharged through the mud discharge port, and concrete enters the borehole from the discharge port to form a pile. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0030] Figure 2 This is a structural diagram of the drill pipe and power unit.

[0031] Figure 3 This is a cross-sectional view of the drill pipe.

[0032] Figure 4 This is a cross-sectional diagram of a dredging organization.

[0033] Explanation of reference numerals in the attached drawings: 1. Frame; 2. First drill rod; 3. Second drill rod; 4. Positioning ring; 5. Fixing ring; 6. Drive screw; 7. Mounting frame; 8. Driven pulley; 9. Power motor; 10. Main pulley; 11. Sludge discharge port; 12. First spiral shaft; 13. First spiral blade; 14. Dredging motor; 15. Gear ring; 16. Drive gear; 17. Second spiral shaft; 18. Second spiral blade; 19. Synchronization groove; 20. Synchronization block; 21. Disc; 22. Concrete pump; 23. Air compressor; 24. Discharge hole; 25. Abutment drill bit; 26. Abutment spring; 27. Blocking rod; 28. Power belt; 29. ​​Feeding pipe. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0035] Reference Figure 1A high-pressure jet grouting pile machine includes a frame 1, a drill rod slidably mounted on the frame 1, a drive device for driving the drill rod to move up and down, and a power device for driving the drill rod to rotate.

[0036] Reference Figure 2 and Figure 3 The drill rod includes a first drill rod 2 and a second drill rod 3. The second drill rod 3 and the second drill rod 3 are hollow inside. The second drill rod 3 is sleeved outside the first drill rod 2. A positioning ring 4 is coaxially fixed at the lower end of the first drill rod 2. The outer diameter of the positioning ring 4 is larger than the inner diameter of the second drill rod 3. The positioning ring 4 is threaded to the inner wall of the second drill rod 3. A fixing ring 5 is fixed at the upper end face of the second drill rod 3. The inner diameter of the fixing ring 5 is smaller than the inner diameter of the second drill rod 3. It is used to prevent the positioning ring 4 from detaching from the second drill rod 3. A spiral blade is fixed on the lower outer wall of the second drill rod 3.

[0037] Reference Figure 1 and Figure 2 The drive unit includes a drive screw 6 rotatably connected to the frame 1, the drive screw 6 being vertically arranged, a mounting frame 7 slidably mounted on the frame 1, the drive screw 6 passing through the mounting frame 7 and threadedly connected to the mounting frame 7, and a drive motor for rotating the drive screw 6 being fixed to the frame 1 by bolts. The power unit includes a driven pulley 8 coaxially fixed to the outer wall of the upper end of the first drill rod 2, a power motor 9 being fixed to the mounting frame 7 by bolts, a main pulley 10 coaxially fixed to the output shaft of the power motor 9, and a power belt 28 connected to the driven pulley 8 being provided on the main pulley 10.

[0038] The power motor 9 drives the driven pulley 8 to rotate via the power belt 28. The driven pulley 8 drives the first drill rod 2 and the second drill rod 3 to rotate. At the same time, the drive screw 6 rotates, causing the drill rod to move downwards, which facilitates drilling into the ground.

[0039] Reference Figure 2 and Figure 3 The lower end of the second drill rod 3 is open, and the upper side wall of the first drill rod 2 is provided with a mud discharge port 11. A dredging device is provided inside the drill rod to discharge mud from the upper end of the first drill rod 2. The dredging device includes two first spiral shafts 12 rotatably connected to the mounting frame 7, and two second spiral shafts 17 vertically arranged and passing through the first drill rod 2. The outer wall of the first spiral shaft 12 is fixed with a first spiral blade 13. The two first spiral shafts 12 are connected by meshing gears. A dredging motor 14 is fixed on the mounting frame 7 to drive one of the first spiral shafts 12 to rotate. Under the action of the first spiral blade 13, the mud is discharged from the mud discharge port 11.

[0040] Reference Figure 3 and Figure 4The dredging device also includes a dredging mechanism disposed within the second drill rod 3. This mechanism is used to transport the soil from the second drill rod 3 into the upper first drill rod 2. The dredging mechanism includes a second spiral shaft 17 rotatably connected within the second drill rod 3. A second spiral blade 18 is fixed to the outer wall of the second spiral shaft 17. The upper end of the second spiral shaft 17 is open, allowing the first spiral shaft 12 and the first spiral blade 13 to be housed within it. The dredging mechanism also includes a dredging assembly that drives the second spiral shaft 17 to rotate. This assembly includes a toothed ring 15 slidably disposed within the second spiral shaft 17. Several synchronous grooves 19 are formed along the length of the inner wall of the second spiral shaft 17. Synchronizing blocks 20 are fixed to the outer wall of the toothed ring 15 and slidably disposed within the corresponding synchronous grooves 19, allowing the toothed ring 15 to slide along the length of the spiral shaft within the second spiral shaft 17 and drive the spiral shaft to rotate.

[0041] Reference Figure 3 and Figure 4 A disk 21 is rotatably connected to the lower end of the first spiral shaft 12. The disk 21 is coaxial with the first spiral shaft 12 and connects two first spiral shafts 12. The two first spiral shafts 12 are rotatably connected to the disk 21. The disk 21 is used to close the upper opening of the second spiral shaft 17. The disk 21 is rotatably connected to the gear ring 15. One of the first spiral shafts 12 passes through the disk 21, and a drive gear 16 is coaxially fixed at the lower end of the first spiral shaft 12. The drive gear 16 meshes with the internal teeth of the gear ring 15.

[0042] The first spiral shaft 12 drives the drive gear 16 to rotate, the drive gear 16 drives the gear ring 15 to rotate, and the gear ring 15 drives the second spiral shaft 17 to rotate. During the rotation of the second spiral shaft 17, the second spiral blade 18 causes the soil to enter the first drill rod 2 and is discharged from the mud discharge port 11 under the action of the first spiral blade 13.

[0043] During the drilling process, the second helical blade 18 and the second helical shaft 17 may push the second helical blade 18 upward. Even if the second helical shaft 17 is completely inside the first drill rod 2, the soil can still be discharged from the mud discharge port 11 through the second helical blade 18, without affecting the output of the soil.

[0044] Reference Figure 1 and Figure 4A concrete pump 22 and an air compressor 23 are fixed on the frame 1. Feed pipes 29 are connected to the concrete pump 22 and the air compressor 23. The two feed pipes 29 pass through the two first spiral shafts 12 and extend to the lower end of the second spiral shaft 17. The two feed pipes 29 are rotatably connected to the two first spiral shafts 12. A switching mechanism is provided at the lower end of the second spiral shaft 17 to facilitate concrete flow. The lower end of the second spiral shaft 17 is open. The switching mechanism includes an abutment drill bit 25 that slides within the second spiral shaft 17. The abutment drill bit 25 is used to close the opening at the lower end of the second spiral shaft 17. An anti-detachment ring is fixed at the lower end of the second spiral shaft 17. The inner diameter of the anti-detachment ring is smaller than the inner diameter of the second spiral shaft 17 to prevent the abutment drill bit 25 from detaching from the second spiral shaft 17 during downward movement.

[0045] Reference Figure 1 and Figure 4 The abutment drill bit 25 is provided with a discharge hole 24 to facilitate the flow of concrete. The second spiral shaft 17 is fixed with an abutment spring 26 to push the abutment drill bit 25 downward. The abutment drill bit 25 abuts against the anti-disengagement ring under the action of the abutment spring 26. The second spiral shaft 17 is provided with a blocking rod 27 for blocking the discharge hole 24.

[0046] During the drilling process, the ground soil pushes the abutting drill bit 25 upward, and the blocking rod 27 seals the discharge hole 24 to prevent soil from entering the second spiral shaft 17. When the second drill rod 3 moves upward, the discharge hole 24 opens under the action of the abutting spring 26, which facilitates the flow of concrete.

[0047] This application also discloses a construction method for a high-pressure jet grouting pile machine, including the following steps:

[0048] S1. The jet grouting pile foundation is moved to the designated position, the second drill rod 3 abuts against the ground, the power motor 9 drives the first drill rod 2 to rotate, and the second drill rod 3 moves downward. During this process, the second drill rod 3 moves outward relative to the first drill rod 2 until the drill rod is extended to its longest position, and the two drill rods rotate synchronously.

[0049] S2. During the drilling process, the soil enters the second drill rod 3. Under the action of the second spiral blade 18, the soil moves towards the first drill rod 2 and is discharged from the upper mud discharge port 11 under the action of the first spiral blade 13.

[0050] S3. During the drilling process, the ground soil causes the abutting drill bit 25 to move upward, the blocking rod 27 closes the mud discharge port 11, the first drill rod 2 rotates in the opposite direction, the second drill rod 2 moves upward, and under the action of the abutting spring 26, the discharge hole 24 opens, and the concrete is discharged from the discharge hole 24 and formed in the borehole.

[0051] S4. The drive motor drives the mounting frame 7 and the drill rod to move upward, completing the entire drilling and grouting process.

[0052] The above are all preferred 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 high-pressure jet grouting pile machine, comprising a frame (1), a drill rod sliding on and off the frame (1), a drive device for driving the drill rod to move up and down, and a power device for driving the drill rod to rotate, characterized in that: The drill rod includes a first drill rod (2) and a second drill rod (3). The second drill rod (3) is sleeved outside the first drill rod (2). A positioning ring (4) is coaxially fixed at the lower end of the first drill rod (2). The positioning ring (4) is threadedly connected to the inner wall of the second drill rod (3). A fixing ring (5) is fixed on the upper end face of the second drill rod (3) to prevent the positioning ring (4) from detaching from the second drill rod (3). An installation frame (7) is provided on the frame (1). The driving device includes a drive screw (6) rotatably connected to the frame (1). The drive screw (6) passes through the installation frame (7) and is threadedly connected to the installation frame (7). A drive motor that drives the drive screw (6) to rotate is fixed on the frame (1). The drill rod is rotatably connected to the installation frame. (7) The power device is mounted on the mounting frame (7); the power device includes a driven pulley (8) fixed to the outer wall of the upper end of the first drill rod (2), a power motor (9) is fixed on the mounting frame (7), a main pulley (10) is fixed on the output shaft of the power motor (9), and a power belt (28) connected to the driven pulley (8) is provided on the main pulley (10); the lower end of the second drill rod (3) is open, and a dredging device is provided inside the drill rod to discharge mud from the upper end of the first drill rod (2). The dredging device includes two first spiral shafts (12) rotatably connected to the mounting frame (7) and passing through the first drill rod (2). First spiral blades are fixed on the outer wall of the first spiral shafts (12). (13) The two first spiral shafts (12) are engaged by meshing gears. A dredging motor (14) that drives one of the first spiral shafts (12) to rotate is fixed on the mounting frame (7). The dredging device also includes a dredging mechanism disposed in the second drill rod (3) and used to send the mud in the second drill rod (3) to the upper first drill rod (2). The dredging mechanism includes a second spiral shaft (17) rotatably connected in the second drill rod (3). A second spiral blade (18) is fixed on the outer wall of the second spiral shaft (17). The upper end of the second spiral shaft (17) is open and used to accommodate the two first spiral blades (13). The dredging mechanism also includes a dredging assembly that drives the second spiral shaft (17) to rotate. The first drill rod (12) is engaged by meshing gears. The upper end of the rod (2) is provided with a sludge discharge port (11); the dredging component includes a toothed ring (15) that is slidably disposed in the second spiral shaft (17), the inner wall of the second spiral shaft (17) is provided with a synchronization groove (19) along its length direction, the outer wall of the toothed ring (15) is fixed with a synchronization block (20) that is slidably disposed in the synchronization groove (19), the lower end of the first spiral shaft (12) is rotatably connected with a disc (21) that connects the two first spiral shafts (12), the disc (21) is used to close the upper opening of the second spiral shaft (17) and is rotatably connected to the toothed ring (15), wherein one of the first spiral shafts (12) passes through the disc (21) and the lower end is fixed with a drive gear (16), the drive gear (16) meshes with the inner teeth of the toothed ring (15).

2. The high-pressure jet grouting pile machine according to claim 1, characterized in that: A concrete pump (22) and an air compressor (23) are fixed on the frame (1). The concrete pump (22) and the air compressor (23) are connected to a feeding pipe (29). The two feeding pipes (29) pass through the two first spiral shafts (12) and extend to the lower end of the second spiral shaft (17). The feeding pipes (29) are rotatably connected to the first spiral shafts (12). The lower end of the second spiral shaft (17) is provided with a switching mechanism to facilitate the flow of concrete.

3. A high-pressure jet grouting pile machine according to claim 2, characterized in that: The switching mechanism includes an abutment drill bit (25) that slides inside a second spiral shaft (17). The lower end of the second spiral shaft (17) is fixed with an anti-detachment ring to prevent the abutment drill bit (25) from detaching from the second spiral shaft (17). The abutment drill bit (25) is provided with a discharge hole (24) to facilitate the flow of concrete. An abutment spring (26) is fixed inside the second spiral shaft (17) to push the abutment drill bit (25) against the anti-detachment ring. A blocking rod (27) is fixed inside the second spiral shaft (17) to block the discharge hole (24) during the drilling process.

4. The construction method using the high-pressure jet grouting pile machine as described in claim 3, characterized in that, Includes the following steps: S1. The jet grouting pile foundation is moved to the designated position, the second drill rod (3) abuts against the ground, the power device drives the first drill rod (2) to rotate, the second drill rod (3) moves downward, and at the same time, the second drill rod (3) moves outward relative to the first drill rod (2) until the drill rod is extended to its longest position, and the two drill rods rotate synchronously. S2. During the drilling process, the soil enters the second drill rod (3) and is discharged from the upper mud discharge port (11) under the action of the second spiral blade (18) and the first spiral blade (13). S3. During the drilling process, the discharge hole (24) is closed, the first drill rod (2) rotates in the opposite direction, the second rotating rod moves upward, the discharge hole (24) opens, and the concrete is discharged from the mud discharge port (11) and formed in the drill hole; S4. The drive motor drives the mounting frame (7) and drill rod to move upward, completing the entire drilling and grouting process.

Images