Long spiral drilling device for occluded cast-in-place pile and construction method

Abstract

The invention discloses an occlusion cast-in-place pile long spiral drilling device and a construction method in the technical field of drilling, the occlusion cast-in-place pile long spiral drilling device comprises a drill rod and a drill bit, the drill bit is fixedly installed at the lower end of the drill rod, the drill bit comprises a center rod and an inner drill column, and the bottom of the inner drill column is fixedly connected with a tip drill; the bottom end of the center rod is fixedly connected with a mounting disc, the circumference of the mounting disc is evenly in ball joint with a plurality of rotating drilling plates, one side of each rotating drilling plate is in ball joint with a connecting pull rod, the center rod is sleeved with a connecting ring, the connecting pull rods are all in ball joint with the connecting ring, and the connecting ring can vertically move and rotate along the center rod and drive the rotating drilling plates to rotate. Reinforcing drills are fixedly mounted on the small side surface and the large plate surface of the rotary drilling plate; a plurality of vibrating bars are mounted in the middle of the inner drill column; the soil breaking and cutting capacity of the drill bit is greatly enhanced, simple hole cleaning is achieved, then the hole forming quality is improved, and the stability of a subsequent concrete pile foundation is enhanced; vibration can be conducted along with lifting of the drill rod, the pile foundation quality is greatly improved, and air holes are reduced.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, specifically to a long spiral drilling device and construction method for interlocking cast-in-place piles. Background Technology

[0002] A long auger drilling rig is a dry drilling machine with helical blades. When operating, the auger drill cuts through the soil using the helical blades on the drill bit and drill rod, bringing the soil to the surface. Using a long auger drill allows for simultaneous drilling and pile formation, avoiding issues like incomplete penetration and borehole collapse. However, because concrete is injected simultaneously with the helical pile pipe extraction, there is no hole cleaning or vibration process. This results in the inability to remove and remove slag from the bottom of the hole, leading to poor pile foundation quality. Furthermore, air trapped in the injected concrete cannot escape, creating numerous pores during concrete solidification. These pores can cause leakage and affect pile strength. Current technologies often sacrifice drill bit excavation capacity to address these issues, making drilling by the weight of the drill rod itself more difficult and reducing drilling efficiency.

[0003] Based on this, the present invention designs a long spiral drilling device and construction method for interlocking cast-in-place piles to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a long spiral drilling device and construction method for interlocking cast-in-place piles, in order to solve the problems mentioned in the background art, such as the lack of hole cleaning and vibration processes, the inability to handle and remove floating slag at the bottom of the hole, poor quality of the bottom of the pile foundation, and the inability to expel air from the injected concrete, which will form a lot of air holes when the concrete pile solidifies, easily leading to leakage and affecting the strength of the pile foundation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: including a drill rod and a drill bit, the drill bit being fixedly installed at the lower end of the drill rod, the drill bit including a central rod and an inner drill column, the inner drill column being located inside the central rod and the two slidingly engaging, and a tip drill being fixedly connected to the bottom of the inner drill column; The bottom end of the central rod is fixedly connected to an installation plate. Multiple rotating drill plates are evenly spherically connected to the installation plate. A connecting rod is spherically connected to one side of each rotating drill plate. A connecting ring is sleeved on the central rod. All connecting rods are connected to the connecting ring. The connecting ring can move up and down and rotate along the central rod and drive the rotating drill plates to rotate. The rotating drill plate has reinforced drills fixedly installed on both its small side and large side. Multiple vibratory rods are installed in the middle of the inner drill string, and the vibratory rods are used to follow the up and down movement of the inner drill string to achieve vibration.

[0006] As a further embodiment of the present invention, the mounting plate is provided with mounting grooves evenly distributed around its circumference, a connecting ball is rotatably connected in the mounting groove, and an extension rod is fixedly connected to the inner side of the rotating drill plate, the extension rod being connected to the connecting ball through a ball head.

[0007] As a further embodiment of the present invention, the rotating drill plate is a fan-shaped plate, the horizontal unfolding diameter of the rotating drill plate matches the outer diameter of the spiral blade outside the drill rod, a ball joint is rotatably connected to the side of the rotating drill plate, a top ball is fixedly installed at the bottom of the connecting ring, and the connecting rod is ball-connected to the ball joint and the top ball at both ends through the ball heads at both ends respectively.

[0008] As a further embodiment of the present invention, the central rod is provided with an upper fixing ring and a lower fixing ring, a reversing gear is installed between the upper fixing ring and the lower fixing ring, a positioning plate is fixedly connected to the side of the upper fixing ring and the lower fixing ring, a drive motor is fixedly installed on the outside of the central rod, and the output end of the drive motor is fixedly connected to the upper fixing ring.

[0009] As a further embodiment of the present invention, a hollow motor is installed on the outer sleeve of the central rod, the output end of the hollow motor is fixedly connected to the connecting ring, and a telescopic cylinder is installed on the top of the hollow motor, the telescopic cylinder being installed inside the drill rod.

[0010] As a further embodiment of the present invention, a bottom plate is fixedly connected to the inner bottom end of the drill rod, the telescopic cylinder is installed at the bottom of the bottom plate, the bottom plate has a plurality of guide holes around its circumference, the bottom of the guide holes is connected to a guide tube, the bottom of the drill rod has an open flared mouth, and the guide tube extends following the shape of the flared mouth.

[0011] As a further embodiment of the present invention, an outer spiral blade matching the rotation of the rotating drill plate is fixedly connected to the outer side of the tip drill, a positioning post is fixedly connected to the top of the tip drill, and a fixing hole is opened at the bottom of the mounting plate, wherein the positioning post is matched and inserted into the fixing hole.

[0012] As a further embodiment of the present invention, mounting plates are provided on both sides of the top of the inner drill string, and drive screws are rotatably connected to both sides inside the central rod. The drive screws pass through the mounting plates and cooperate with them, and an elastic scraper ring is installed at the bottom of the central rod.

[0013] A method for constructing interlocking cast-in-place piles using long spiral drilling includes the following steps: S1: The pile driver lowers the drill rod at the measured position, and the pile driver drives the drill rod to rotate and drill vertically downwards; S2: The drill bit, which is composed of a tip drill and a rotating drill plate, achieves rotary cutting and vertical drilling. The drill cuttings are discharged through the spiral blades outside the drill rod until the drill reaches the designed height. S3: The rotating and lowering connecting ring pulls the rotating drill plate through the connecting rod to first rotate to the vertical state on the vertical surface, and then rotates to the horizontal unfolded state; S4: Repeatedly lifting the drill rod can cause the rotating drill plate to compact the soil and debris at the bottom of the hole; S5: Then retract the rotating drill plate to its original state, inject super-fluid concrete into the bottom of the hole through the middle of the drill rod, and lift the drill rod while injecting concrete, at the same time causing the inner drill string to move up and down, and use a vibrator to vibrate the injected concrete until the injection is complete. S6: Sink the woven steel cage into the hole.

[0014] Compared with the prior art, the beneficial effects of the present invention are: By rotating the outer and inner sides of the drill plate to reinforce the drill, the hole surface and rotation direction are cut, which greatly enhances the drill bit's soil breaking and cutting capabilities. Furthermore, the rotating drill plate can change the tilt angle and can rotate vertically, and has a certain amount of room for maneuver when necessary, which greatly reduces the probability of the drill getting stuck.

[0015] Multiple fan-shaped rotating drill plates have a circular unfolded surface. At this time, by repeatedly lifting and rotating the drill rod with the pile driver, the loose soil at the bottom of the hole can be compacted through the unfolded rotating drill plates to form a relatively dense bottom of the hole, realizing simple hole cleaning, thereby improving the quality of hole formation and helping to enhance the stability of subsequent concrete pile foundations.

[0016] Because the vibratory rod can vibrate along with the drill rod as it is lifted, the entire concrete pile can be vibrated, which greatly improves the quality of the pile foundation and reduces the occurrence of air bubbles. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a half-sectional view of the overall structure of the present invention from a frontal perspective; Figure 3 This is a schematic diagram of the front view structure of the drill bit part of the present invention; Figure 4 This is a top-view structural diagram of the drill bit portion of the present invention; Figure 5 This is a schematic diagram of the drill bit structure from an elevation view. Figure 6 This is a side-view half-section structural diagram of the drill bit portion of the present invention; Figure 7 This is a schematic diagram of the stepped cross-section structure of the drill bit at the front view of the overall structure of the present invention; Figure 8 This is a schematic diagram of the stepped cross-section structure of the drill bit part of the present invention from the front view. Figure 9 This is a schematic diagram of the drill bit in its initial state, showing its top and frontal views. Figure 10 This is a schematic diagram of the drill bit part of the present invention in a vertically unfolded state, viewed from a top angle and from a front angle. Figure 11 This is a schematic diagram of the drill bit of the present invention in a horizontally unfolded state, viewed from a top angle and from a front angle. Figure 12 This is a schematic diagram illustrating the use of the internal drill string for vibration compaction in this invention.

[0018] The attached diagram lists the components represented by each number as follows: 1. Drill rod; 2. Drill bit; 3. Center rod; 4. Inner drill string; 5. Tip drill; 6. Mounting plate; 7. Rotating drill plate; 8. Connecting rod; 9. Connecting ring; 10. Reinforcing drill; 11. Vibrating rod; 12. Mounting groove; 13. Connecting ball; 14. Extension rod; 15. Ball joint ring; 16. Top ball; 17. Upper fixing ring; 18. Lower fixing ring; 19. Positioning plate; 20. Drive motor; 21. Reversing gear; 22. Hollow motor; 23. Telescopic cylinder; 24. Bottom plate; 25. Guide hole; 26. Guide tube; 27. Trumpet mouth; 28. Outer rotating blade; 29. ​​Positioning post; 30. Fixing hole; 31. Mounting plate; 32. Drive screw; 33. Elastic scraper ring. Detailed Implementation

[0019] Please see Figure 1-12 The working principle of the technical solution provided by this invention is as follows: In the initial state, drill bit 2 is as follows Figure 9 The diagram shows the retracted state. In use, the drill bit 2 in its initial state is lowered by the pile driver and rotated vertically downwards. During drilling, the outer rotating edge 28 of the tip drill 5 effectively breaks the soil. The reinforced drills 10 on the outer and inner sides of the rotating drill plate 7 achieve cutting of the hole surface and rotation direction, greatly enhancing the soil breaking and cutting capabilities of the drill bit 2. Furthermore, the rotating drill plate 7 can change its tilt angle and rotate vertically, providing a certain amount of room for maneuver when necessary, greatly reducing the probability of the drill getting stuck. At the same time, the reinforced drills 10 can be selected and installed according to the soil conditions of the borehole, thereby expanding the overall applicability of the drill rod 1. If the reinforced drills 10 on the outer and inner sides of the rotating drill plate 7 are designed to move up and down along the surface of the rotating drill plate 7, the drilling and cutting capabilities can be further enhanced, greatly accelerating the progress of the project and improving efficiency.

[0020] After drilling is completed, (with) Figure 9 Taking the direction of rotation of the connecting rod 8 as a positive direction as an example, the connecting ring 9 is driven to rotate in the opposite direction and move upward appropriately, thereby causing the upper end of the connecting rod 8 to rotate around the axis of the central rod 3, until the originally tilted rotating drill plate 7 is pulled to a vertical position. At this time, the inner side of the rotating drill plate 7 is parallel to the axis of the central rod 3. Then the connecting ring 9 is moved downward, and the rotating drill plate 7 is lowered and opened up by the connecting rod 8. Figure 10As shown, during this process, the rotating drill plate 7 rotates in the vertical plane, first returning to the vertical state and then rotating again. This method minimizes rotational resistance and allows the rotating drill plate 7 to rotate smoothly.

[0021] Then the drive connecting ring 9 rotates forward and moves downward, thereby changing the rotating drill plate 7 as shown by the connecting rod 8. Figure 11 As shown in the horizontal unfolded state, multiple fan-shaped rotating drill plates 7 have circular unfolded surfaces, and the diameter of these circular unfolded surfaces can be slightly smaller than or equal to the diameter of the outer spiral blades of the drill rod 1. At this time, by repeatedly lifting and rotating the drill rod 1 with the pile driver, the loose soil at the bottom of the hole can be compacted through the unfolded rotating drill plates 7 to form a relatively dense bottom of the hole, achieving simple hole cleaning, thereby improving the hole formation quality and enhancing the stability of the subsequent concrete pile foundation.

[0022] After the bottom of the hole is compacted, the drive connecting ring 9 rotates in the opposite direction and rises, causing the rotating drill plate 7 to return to its original position. Figure 9 As shown in the diagram, the connecting ring 9 is then driven to rise, causing the rotating drill plate 7 to return to its inner side parallel to the axis of the central rod 3. The connecting ring 9 is then rotated forward and moved downward, and the connecting rod 8 pulls the rotating drill plate 7 to a certain angle, so that the rotation direction of the rotating drill plate 7 is the same as the rotation direction of the outer rotating blade 28. Thus, the two work together to achieve a smoother cutting and hole-forming effect.

[0023] like Figure 11 As shown, after this, superfluid concrete is injected through the middle of drill rod 1. While injecting concrete, the drill rod 1 is lifted by the pile driver, and it is lifted along with the rising concrete level. During this process, the drive screw 32 inside the vibrator 11 and the center rod 3 is rotated, which causes the mounting plate 31 to move the inner drill string 4 downward. During the downward movement, the drive screw 32 rotates at a relatively fast speed, which quickly sinks the inner drill string 4 into the concrete connected to the vibrator 11. Then, the drive screw 32 is driven at a slower speed to slowly lift the vibrator 11, so as to achieve fast insertion and slow withdrawal vibration, thereby effectively removing air from the concrete. Since the vibrator 11 can vibrate along with the lifting of the drill rod 1, the entire concrete pile can be vibrated, which greatly improves the quality of the pile foundation and reduces the occurrence of air holes.

[0024] During the upward movement of the inner drill string 4, it needs to pass through the elastic scraper ring 33 at the bottom of the mounting plate 6, which can scrape off the concrete on the surface of the vibrator 11, preventing a large amount of concrete from being brought into the cavity of the central rod 3, thus ensuring the stable operation of the drive screw 32 during vibration. At the same time, the end of the drive screw 32 can be set at the upper part of the bottom of the mounting plate 6, which can effectively prevent concrete from accumulating at the bottom and affecting the transmission. In addition, the drive screw 32 is set at a certain distance from the inner drill string 4, which can also greatly avoid contamination during use.

[0025] As drill rod 1 is lifted, grouting and vibration are carried out simultaneously, which is more efficient and convenient. It can save time and improve efficiency while achieving the same effect, and has a better effect on improving the quality of pile foundation.

[0026] Following the arrangement of plain piles and reinforced piles, depending on the type of pile foundation, decide whether to subsequently sink a reinforcing cage. Drill holes between two plain piles to form a pile foundation with a reinforcing cylinder. Repeat the above steps until all pile foundations are constructed, forming interlocking concrete pile foundations.

[0027] Specifically, in the initial state, the positioning plate 19 on the outer side of the upper fixing ring 17 and the lower fixing ring 18 clamps the rotating drill plate 7 between them, thereby stabilizing and reinforcing the rotating drill plate 7 when it rotates and drills a hole, avoiding excessive force on the connection of the extension rod 14 and the connection of the two ends of the connecting rod 8, thus protecting the joint and benefiting the service life of the drill bit 2; and when rotating and drilling, most of the connecting rod 8 and the connecting ring 9 are located in the space below the drill rod 1, thus better protecting the connecting rod 8 and the connecting ring 9 during the drilling process.

[0028] When the rotating drill plate 7 rotates from its initial state, the upper fixed ring 17 is directly driven to rotate by the drive motor 20. A reversing gear 21 meshes between the bottom surface of the upper fixed ring 17 and the top surface of the lower fixed ring 18. When the upper fixed ring 17 rotates, the lower fixed ring 18 rotates in the opposite direction at the same time, thereby causing the positioning plates 19 on the outer sides of the upper fixed ring 17 and the lower fixed ring 18 to move away from each other, thereby releasing the rotating drill plate 7 so that it can rotate.

[0029] When the rotating drill plate 7 retracts, the rotating drill plate 7 is located at Figure 10 In the state shown, the narrow inner surface of the rotating drill plate 7 is aligned with the gap between the positioning plate 19 of the upper fixing ring 17 and the lower fixing ring 18. At this time, the gap is relatively large, which is also very conducive to the retraction of the rotating drill plate 7. After the rotating drill plate 7 returns to the initial state, the upper fixing ring 17 is reversed by the drive motor 20, which causes the positioning plate 19 of the upper fixing ring 17 and the lower fixing ring 18 to move closer to each other, and the rotating drill plate 7 can be clamped and fixed again.

[0030] In the initial state, the positioning pin 29 of the tip drill 5 is inserted into the fixing hole 30 of the mounting plate 6, so that the rotational force during the drilling process of the tip drill 5 can be effectively transmitted, and at the same time the drive component of the inner drill string 4 is protected.

Claims

1. A long spiral drilling device for an interlocking cast-in-place pile, comprising a drill rod (1) and a drill bit (2), wherein the drill bit (2) is fixedly mounted on the lower end of the drill rod (1), and characterized in that: The drill bit (2) comprises a center rod (3) and an inner drill column (4), wherein the inner drill column (4) is located inside the center rod (3) and the two are slidably matched, and a tip drill (5) is fixedly connected to the bottom of the inner drill column (4); The bottom end of the center rod (3) is fixedly connected to a mounting plate (6), and a plurality of rotating drill plates (7) are evenly ball-connected on the circumference of the mounting plate (6). A connecting rod (8) is ball-connected on one side of the rotating drill plate (7). A connecting ring (9) is provided on the outer sleeve of the center rod (3), and the connecting rods (8) are ball-connected to the connecting ring (9). The connecting ring (9) can move up and down and rotate along the center rod (3) and drive the rotating drill plate (7) to rotate; A reinforcement drill (10) is fixedly mounted on the small side surface and the large plate surface of the rotating drill plate (7); A plurality of vibrating rods (11) are installed in the middle of the inner drill string (4), and the vibrating rods (11) are used to achieve vibration following the up and down movement of the inner drill string (4).

2. The device for drilling long spiral holes for occlusal cast-in-place piles according to claim 1, characterized in that: The mounting plate (6) is evenly provided with mounting grooves (12) on its circumference, a connecting ball (13) is rotatably connected in the mounting groove (12), an extension rod (14) is fixedly connected to the inner side of the rotating drill plate (7), and the extension rod (14) is spherically connected to the connecting ball (13) via a ball head.

3. The device for drilling long spiral holes for occlusal cast-in-place piles according to claim 1, characterized in that: The rotating drill plate (7) is a fan-shaped plate, the horizontal expansion diameter of the rotating drill plate (7) matches the outer diameter of the spiral blade outside the drill rod (1), the rotating drill plate (7) is rotatably connected to a ball joint ring (15) on the side, the bottom of the connecting ring (9) is fixedly mounted with a top ball (16), and the connecting rod (8) is respectively ball-connected to the ball joint ring (15) and the top ball (16) through ball heads at both ends.

4. The device for drilling long spiral holes for occlusal cast-in-place piles according to claim 1, characterized in that: An upper fixing ring (17) and a lower fixing ring (18) are provided on the outer shell of the center rod (3); a reversing gear (21) is installed between the upper fixing ring (17) and the lower fixing ring (18); positioning plates (19) are fixedly connected to the sides of the upper fixing ring (17) and the lower fixing ring (18); a driving motor (20) is fixedly installed outside the center rod (3); and an output end of the driving motor (20) is fixedly connected to the upper fixing ring (17).

5. The device for drilling long spiral holes for occlusal cast-in-place piles according to claim 1, characterized in that: The outer shell of the central rod (3) is provided with a hollow motor (22), the output end of the hollow motor (22) is fixedly connected to the connecting ring (9), the top of the hollow motor (22) is provided with a telescopic cylinder (23), and the telescopic cylinder (23) is installed in the drill rod (1).

6. The device for drilling long spiral holes for occlusal cast-in-place piles according to claim 5, characterized in that: The inner bottom end of the drill rod (1) is fixedly connected to a bottom plate (24), the telescopic cylinder (23) is mounted on the bottom of the bottom plate (24), a plurality of guide holes (25) are provided on the circumference of the bottom plate (24), the bottom of the guide holes (25) are connected to a guide tube (26), the bottom of the drill rod (1) is provided with an open bell mouth (27), and the guide tube (26) extends along the shape of the bell mouth (27).

7. The device for drilling long spiral holes for occlusal cast-in-place piles according to claim 1, characterized in that: An external rotating blade (28) matching the rotation of the rotating drill plate (7) is fixedly connected to the outside of the tip drill (5), a positioning column (29) is fixedly connected to the top of the tip drill (5), a fixing hole (30) is provided at the bottom of the mounting plate (6), and the positioning column (29) is matched and plugged into the fixing hole (30).

8. The device for drilling long spiral holes for occlusal cast-in-place piles according to claim 1, characterized in that: The top of the inner drill column (4) is symmetrically provided with mounting plates (31) on both sides, and the inside of the center rod (3) is rotatably connected with driving screws (32) on both sides. The driving screws (32) pass through the mounting plates (31) and cooperate with them. The bottom end of the center rod (3) is installed with an elastic scraper ring (33).

9. A method for constructing a long spiral drilling hole for a occlusal cast-in-place pile, comprising the drilling device according to any one of claims 1 to 8, characterized in that The following steps are involved: S1: A pile driver is used to drill a drill rod (1) at a measured position, and the pile driver drives the drill rod (1) to rotate and drill vertically; S2: The drill bit (2) composed of a tip drill (5) and a rotating drill plate (7) is used to perform rotary cutting and vertical drilling, and the drill cuttings are discharged through the spiral blades outside the drill rod (1) until the drill reaches the designed height; S3: rotating and moving the connecting ring (9) downward to pull and rotate the drill plate (7) through the connecting pull rod (8) to first rotate it to a vertical state and then rotate it to a horizontal unfolded state; S4: By repeatedly lifting the drill rod (1), the drill plate (7) can be rotated to compact the soil residue at the bottom of the hole; S5: Then, the rotating drill plate (7) is retracted to its original state, and superfluid concrete is injected into the bottom of the hole through the middle of the drill rod (1). The drill rod (1) is lifted while the concrete is injected, and at the same time, the inner drill column (4) is moved up and down, and the injected concrete is vibrated by the vibrating rod (11) until the injection is completed; S6: Sink the braided steel cage into the hole.

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