Bridge pile foundation rotary drilling and grouting device and construction method

Abstract

This invention belongs to the field of bridge pile foundation construction technology, and particularly relates to a rotary drilling grouting device and construction method for bridge pile foundations. The grouting device includes: a support frame, disposed above the pile hole; a funnel, fixedly connected to the top of the support frame; a bidirectional mixing mechanism, fixedly connected to the top of the support frame, with the mixing end of the bidirectional mixing mechanism located inside the funnel; a lifting guide tube, sealed and slidably connected to the bottom of the funnel, with the top of the lifting guide tube movably connected to the bottom of the mixing end of the bidirectional mixing mechanism, and multiple grout inlet holes opened on the top of the side wall of the lifting guide tube; a mode conversion mechanism, movably disposed at the top of the lifting guide tube; multiple connecting guide tubes, detachably connected end-to-end to the bottom of the lifting guide tube; a limiting mechanism, fixedly connected to the bottom of the support frame, used to limit and stabilize the connecting guide tubes; and a control box, fixedly connected to the bottom of the support frame, electrically connected to a height sensor, and electrically connected to the bidirectional mixing mechanism and the limiting mechanism.

Description

Technical Field

[0001] This invention belongs to the field of bridge pile foundation construction technology, and particularly relates to a rotary drilling and grouting device and construction method for bridge pile foundations. Background Technology

[0002] Bridge pile foundation construction is a crucial step in large-scale infrastructure projects, and its technology is constantly evolving with urbanization. Rotary drilling rigs use mud slurry to efficiently form holes, followed by concrete pouring, which requires a guide pipe. Concrete is injected into the bottom of the hole through the guide pipe, which is then gradually raised and removed as the pouring progresses, with the guide pipe's depth strictly controlled between 2 and 6 meters. However, in traditional construction, each removal of the guide pipe necessitates the removal and recalibration of a large hopper, a cumbersome and inefficient process that hinders continuous operation. Furthermore, air easily gets trapped in the concrete within the hopper, and during pouring, the concrete relies on its own weight to be pushed upwards, leading to uneven diffusion, the formation of slurry, or the settling of aggregate at the bottom, ultimately affecting the overall quality of the pile.

[0003] Therefore, it is necessary to design a rotary drilling and grouting device and construction method for bridge pile foundations to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a rotary drilling and grouting device and construction method for bridge pile foundations, so as to solve the above-mentioned problems and improve the construction efficiency and quality of piles.

[0005] To achieve the above objectives, the present invention provides the following solution: a rotary drilling and grouting device for bridge pile foundations, comprising: The support frame is installed above the pile hole; A funnel, fixedly connected to the top of the support frame, is used to store slurry; A bidirectional stirring mechanism is fixedly connected to the top of the support frame, and the stirring end of the bidirectional stirring mechanism is located inside the funnel; A lifting guide tube is slidably and sealed to the bottom of the funnel. The top of the lifting guide tube is movably connected to the bottom of the stirring end of the bidirectional stirring mechanism. Multiple slurry inlet holes are provided on the top of the side wall of the lifting guide tube. A mode conversion mechanism is movably disposed at the top of the lifting guide tube. When the bidirectional stirring mechanism rotates in the forward direction, the mode conversion mechanism is used to drive the lifting guide tube to rotate relative to the bidirectional stirring mechanism. When the bidirectional stirring mechanism rotates in the reverse direction, the mode conversion mechanism is used to drive the lifting guide tube to rise relative to the bidirectional stirring mechanism. Multiple connecting conduits are detachably connected end-to-end to the bottom of the lifting conduit. A limiting mechanism is fixedly connected to the bottom end of the support frame, and the limiting mechanism is used to limit and stabilize the connecting conduit; The control box is fixedly connected to the bottom end of the support frame. The control box is electrically connected to a height sensor and is electrically connected to the bidirectional stirring mechanism and the limiting mechanism.

[0006] According to the present invention, a rotary drilling and grouting device for bridge pile foundations includes a bidirectional mixing mechanism comprising a first support plate, the first support plate being fixedly connected to the top end of a support frame, a first motor being fixedly connected to the top end of the first support plate, a drive sprocket being coaxially fixedly connected to the output shaft of the first motor, a driven sprocket being connected to the drive sprocket via chain drive, and a mixing part being coaxially fixedly connected inside the driven sprocket, the mixing part being located inside the funnel.

[0007] According to the present invention, a rotary drilling and grouting device for bridge pile foundations includes a mixing section comprising a hollow rotating rod. The top end of the hollow rotating rod is coaxially and fixedly connected to the inside of the driven sprocket. A horizontal plate is rotatably connected to the middle of the outer wall of the hollow rotating rod via a bearing. The horizontal plate is fixedly connected to the top end of the support frame. Multiple mixing rods are fixedly connected to the bottom of the outer wall of the hollow rotating rod. The multiple mixing rods are equally spaced along the circumference and axial direction of the outer wall of the hollow rotating rod. A threaded portion is provided on the inner wall of the hollow rotating rod. The top end of the lifting guide tube is movably disposed inside the bottom end of the hollow rotating rod. The mode conversion mechanism is in transmission cooperation with the threaded portion.

[0008] According to the present invention, a rotary drilling and grouting device for bridge pile foundation is provided, wherein the threaded part includes an annular groove and a spiral groove. The annular groove is opened at the bottom of the inner side wall of the hollow rotating rod and is horizontally arranged, and the spiral groove is opened at the inner side wall of the hollow rotating rod and its bottom end communicates with the annular groove.

[0009] According to the present invention, a rotary drilling and grouting device for bridge pile foundations includes a mode conversion mechanism comprising a connecting shaft rotatably connected to the top end of a lifting guide tube. A torsion spring is sleeved on the outer side of the connecting shaft and located inside the lifting guide tube. One end of the torsion spring is fixedly connected to the outer wall of the connecting shaft, and the other end of the torsion spring is fixedly connected to the inner wall of the lifting guide tube. A guide block is fixedly connected to one end of the connecting shaft and located outside the lifting guide tube. The guide block slides in cooperation with the annular groove and the spiral groove.

[0010] According to the present invention, a rotary drilling grouting device for bridge pile foundation is provided, wherein a limiting ring is fixedly connected to the top of the outer side wall of the connecting guide pipe.

[0011] According to the present invention, a rotary drilling and grouting device for bridge pile foundations includes a limiting mechanism comprising two second support plates, the second support plates being fixedly connected to the bottom end of a support frame, a second motor being fixedly connected to one top end of one second support plate, and a bidirectional lead screw being coaxially fixedly connected to one end of the output shaft of the second motor, the two ends of the bidirectional lead screw having opposite thread directions, the other end of the bidirectional lead screw being rotatably connected to a first fixed seat, the first fixed seat being fixedly connected to one top end of the other second support plate, both ends of the bidirectional lead screw being threadedly connected to a limiting plate, and the ends of the two limiting plates away from the bidirectional lead screw being slidably connected to a guide rod, the guide rod being fixedly connected to the top end of the second support plate through a second fixed seat.

[0012] According to the present invention, a bridge pile foundation rotary drilling and grouting device is provided, wherein a third support plate is fixedly connected to the bottom end of the support frame, and a control box is fixedly connected to the top end of the third support plate.

[0013] According to the present invention, a rotary drilling and grouting device for bridge pile foundation is provided, wherein two connecting blocks are fixedly connected to the outer wall of the funnel, the two connecting blocks are symmetrically arranged on both sides of the funnel, and the connecting blocks are fixedly connected to the top of the support frame through a fixing plate.

[0014] A method for rotary drilling and grouting construction of bridge pile foundations includes the following steps: Step 1: Install a fixed support frame above the pile hole, connect multiple connecting pipes end to end, connect the first connecting pipe to the lifting pipe, extend the last connecting pipe to the predetermined position at the bottom of the pile hole, calibrate the relative position of the connecting pipe and the pile hole, and activate the limiting mechanism to fix and clamp the connecting pipe. Step 2: Inject slurry into the funnel, start the bidirectional mixing mechanism to rotate forward and mix the slurry. At the same time, the slurry enters the lifting guide pipe through the slurry inlet hole and is finally injected into the pile hole through the connecting pipe. Step 3: When the grout in the pile hole rises to the predetermined height, release the limiting mechanism from fixing the connecting pipe, then drive the bidirectional mixing mechanism to rotate in the opposite direction, causing the lifting pipe and connecting pipe to rise. Then remove the first connecting pipe and reconnect the remaining connecting pipes to the lifting pipe. Then drive the bidirectional mixing mechanism to rotate in the forward direction again to lower the lifting pipe and connecting pipe to the installation height. Reactivate the limiting mechanism to fix the connecting pipe, and then continue grouting. Step 4: Repeat step 3 until the pile body is poured.

[0015] Compared with the prior art, the present invention has the following advantages and technical effects: This invention integrates mixing, grouting, and guide pipe lifting functions into one unit, effectively solving problems such as cumbersome repeated hopper relocation, concrete segregation, and discontinuous grouting in traditional processes. When the mixing mechanism rotates forward, it not only prevents concrete segregation within the mixing funnel but also drives the lifting guide pipe to rotate via a mode-switching mechanism, allowing concrete to enter the guide pipe more evenly through the inlet hole, reducing air ingress and improving flow uniformity. When rotating in the reverse direction, the mode-switching mechanism drives the lifting guide pipe and the connecting guide pipe below to rise as a whole, creating conditions for dismantling the uppermost section of the guide pipe. This invention eliminates the need to remove the hopper; simply lift the guide pipe and dismantle it under the reverse drive of the mixing mechanism, then lower it back to its original position under forward drive, and re-secure it via a limiting mechanism. This significantly simplifies the guide pipe assembly and disassembly process, enables continuous grouting operations, and significantly improves construction efficiency and pile quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall invention.

[0018] Figure 2 This is a schematic diagram of the structure of the present invention after the support frame is removed.

[0019] Figure 3 This is a schematic diagram of the lifting guide tube of the present invention.

[0020] Figure 4 This is a cross-sectional view of the hollow rotating rod of the present invention.

[0021] The components are as follows: 1. Pile hole; 2. Support frame; 3. Funnel; 4. First support plate; 5. First motor; 6. Drive sprocket; 7. Chain; 8. Driven sprocket; 9. Hollow rotating rod; 10. Mixing rod; 11. Lifting guide pipe; 12. Connecting guide pipe; 13. Limiting ring; 14. Second support plate; 15. Second motor; 16. Bidirectional lead screw; 17. First fixed seat; 18. Guide rod; 19. Second fixed seat; 20. Limiting plate; 21. Third support plate; 22. Control box; 23. Height sensor; 24. Grout inlet; 25. Connecting shaft; 26. Torsion spring; 27. Guide block; 28. Annular groove; 29. ​​Spiral groove; 30. Connecting block; 31. Fixed plate; 32. Horizontal plate. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Reference Figures 1 to 4 As shown, the present invention provides a rotary drilling grouting device for bridge pile foundations, comprising: Support frame 2 is installed above pile hole 1; Funnel 3 is fixedly connected to the top of support frame 2 and is used to store slurry; A bidirectional stirring mechanism is fixedly connected to the top of the support frame 2, and the stirring end of the bidirectional stirring mechanism is located inside the funnel 3; The lifting guide tube 11 is sealed and slidably connected to the bottom end of the funnel 3. The top end of the lifting guide tube 11 is movably connected to the bottom of the stirring end of the bidirectional stirring mechanism. Multiple slurry inlet holes 24 are opened on the top side wall of the lifting guide tube 11. The mode conversion mechanism is movably set at the top of the lifting guide tube 11. When the bidirectional stirring mechanism rotates in the forward direction, the mode conversion mechanism is used to drive the lifting guide tube 11 to rotate relative to the bidirectional stirring mechanism. When the bidirectional stirring mechanism rotates in the reverse direction, the mode conversion mechanism is used to drive the lifting guide tube 11 to rise relative to the bidirectional stirring mechanism. Multiple connecting conduits 12 are detachably connected end-to-end to the bottom of the lifting conduit 11; The limiting mechanism is fixedly connected to the bottom end of the support frame 2. The limiting mechanism is used to limit and stabilize the connecting conduit 12. The control box 22 is fixedly connected to the bottom of the support frame 2. The control box 22 is electrically connected to the height sensor 23. The control box 22 is also electrically connected to the bidirectional stirring mechanism and the limit mechanism.

[0025] Furthermore, the bidirectional stirring mechanism includes a first support plate 4, which is fixedly connected to the top of the support frame 2. A first motor 5 is fixedly connected to the top of the first support plate 4. The output shaft of the first motor 5 is coaxially fixedly connected to a drive sprocket 6. The drive sprocket 6 is driven by a chain 7 and connected to a driven sprocket 8. A stirring part is coaxially fixedly connected inside the driven sprocket 8, and the stirring part is located inside the funnel 3.

[0026] Furthermore, the stirring section includes a hollow rotating rod 9, the top end of which is coaxially fixedly connected to the inside of the driven sprocket 8. A horizontal plate 32 is rotatably connected to the middle of the outer wall of the hollow rotating rod 9 via a bearing. The horizontal plate 32 is fixedly connected to the top end of the support frame 2. Multiple stirring rods 10 are fixedly connected to the bottom of the outer wall of the hollow rotating rod 9. The multiple stirring rods 10 are equally spaced along the circumference and axial direction of the outer wall of the hollow rotating rod 9. A threaded part is provided on the inner wall of the hollow rotating rod 9. The top end of the lifting guide tube 11 is movably disposed inside the bottom end of the hollow rotating rod 9. The mode conversion mechanism is driven and cooperates with the threaded part.

[0027] Furthermore, the threaded portion includes an annular groove 28 and a spiral groove 29. The annular groove 28 is formed at the bottom of the inner wall of the hollow rotating rod 9 and is horizontally arranged. The spiral groove 29 is formed at the inner wall of the hollow rotating rod 9 and its bottom end communicates with the annular groove 28.

[0028] Furthermore, the mode conversion mechanism includes a connecting shaft 25, which is rotatably connected to the top end of the lifting guide tube 11. A torsion spring 26 is sleeved on the outside of the connecting shaft 25. The torsion spring 26 is located inside the lifting guide tube 11. One end of the torsion spring 26 is fixedly connected to the outer wall of the connecting shaft 25, and the other end of the torsion spring 26 is fixedly connected to the inner wall of the lifting guide tube 11. A guide block 27 is fixedly connected to one end of the connecting shaft 25. The guide block 27 is located outside the lifting guide tube 11 and slides with the annular groove 28 and the spiral groove 29.

[0029] When the first motor 5 rotates in the forward direction, it drives the hollow rotating rod 9 and the stirring rod 10 to rotate in the forward direction through the driving sprocket 6, chain 7, and driven sprocket 8, stirring the slurry in the funnel 3. When the hollow rotating rod 9 rotates in the forward direction, the guide block 27 slides with the annular groove 28, keeping the lifting guide tube 11 at a certain height in the vertical direction. The torsion spring 26 is in a compressed state. At this time, the bottom of the slurry inlet hole 24 is located above the bottom of the funnel 3. The slurry in the funnel 3 enters the lifting guide tube 11 through the slurry inlet hole 24 and is finally injected into the pile hole 1 through the connecting guide tube 12. When the slurry injected into the pile hole 1 reaches the preset height, the control box 22 controls the first motor 5 to rotate in the reverse direction. The first motor 5 drives the hollow rotating rod 9 to rotate in the reverse direction. When the hollow rotating rod 9 rotates to the annular groove... When the connection point of the annular groove 28 and the spiral groove 29 contacts the guide block 27, the torsion spring 26 drives the guide block 27 from the annular groove 28 into the spiral groove 29 by restoring its original state. The hollow rotating rod 9 continues to rotate and drives the lifting guide tube 11 and the connecting guide tube 12 to rise vertically through the spiral groove 29 until the grout inlet hole 24 on the lifting guide tube 11 is completely blocked by the hollow rotating rod 9. At this time, no more grout enters the lifting guide tube 11 and the connecting guide tube 12. Then, the workers remove the first section of the connecting guide tube 12 and connect the remaining connecting guide tube 12 to the lifting guide tube 11. The first motor 5 is started again to rotate in the forward direction. The lifting guide tube 11 and the remaining connecting guide tube 12 descend to their original height. The grout inlet hole 24 opens again and continues to inject grout into the pile hole 1.

[0030] Furthermore, a limiting ring 13 is fixedly connected to the top of the outer wall of the connecting conduit 12.

[0031] Furthermore, the limiting mechanism includes two second support plates 14, which are fixedly connected to the bottom of the support frame 2. A second motor 15 is fixedly connected to one top end of one second support plate 14. The output shaft of the second motor 15 is coaxially fixedly connected to one end of a bidirectional lead screw 16. The threads at both ends of the bidirectional lead screw 16 have opposite directions. The other end of the bidirectional lead screw 16 is rotatably connected to a first fixed seat 17. The first fixed seat 17 is fixedly connected to one top end of the other second support plate 14. Both ends of the bidirectional lead screw 16 are threadedly connected to limit plates 20. The ends of the two limit plates 20 away from the bidirectional lead screw 16 are slidably connected to a guide rod 18. The guide rod 18 is fixedly connected to the top end of the second support plate 14 through a second fixed seat 19.

[0032] During the grouting process, the two limiting plates 20 are close to each other and attached to the outer wall of the connecting conduit 12, forming a fixed clamping on the connecting conduit 12. When it is necessary to raise the lifting conduit 11 and the connecting conduit 12 and remove the first section of the connecting conduit 12, the two limiting plates 20 are first moved away from each other to fix the connecting conduit 12. Then, the lifting conduit 11 and the connecting conduit 12 are driven to rise and the first section of the connecting conduit 12 is removed. After the removal is completed and the lifting conduit 11 and the remaining connecting conduit 12 are lowered back to their original height, the two limiting plates 20 are brought close to each other again to fix the connecting conduit 12.

[0033] Furthermore, a third support plate 21 is fixedly connected to the bottom of the support frame 2, and the control box 22 is fixedly connected to the top of the third support plate 21.

[0034] Furthermore, two connecting blocks 30 are fixedly connected to the outer wall of the funnel 3. The two connecting blocks 30 are symmetrically arranged on both sides of the funnel 3. The connecting blocks 30 are fixedly connected to the top of the support frame 2 through the fixing plate 31.

[0035] A construction method for a rotary drilling grouting device for bridge pile foundations includes the following steps: Step 1: Install a fixed support frame 2 above the pile hole 1, connect multiple connecting pipes 12 end to end, connect the first connecting pipe 12 to the lifting pipe 11, extend the last connecting pipe 12 to the predetermined position at the bottom of the pile hole 1, calibrate the relative position of the connecting pipe 12 and the pile hole 1, and activate the limiting mechanism to fix and clamp the connecting pipe 12. Step 2: Inject slurry into funnel 3, start the bidirectional stirring mechanism to rotate forward and stir the slurry. At the same time, the slurry enters the lifting guide pipe 11 through the slurry inlet hole 24, and is finally injected into the pile hole 1 through the connecting guide pipe 12. Step 3: When the grout in pile hole 1 rises to the predetermined height, release the limiting mechanism from fixing the connecting pipe 12, then drive the bidirectional mixing mechanism to rotate in the opposite direction, causing the lifting pipe 11 and connecting pipe 12 to rise. Then remove the first connecting pipe 12 and reconnect the remaining connecting pipe 12 to the lifting pipe 11. Then drive the bidirectional mixing mechanism to rotate in the forward direction again to lower the lifting pipe 11 and connecting pipe 12 to the installation height. Reactivate the limiting mechanism to fix the connecting pipe 12, and then continue grouting. Step 4: Repeat step 3 until the pile body is poured.

[0036] The specific working process of this invention is as follows: First, the support frame 2 is securely set above the pile hole 1. Then, multiple connecting conduits 12 are connected end to end to form a grouting channel, and the uppermost connecting conduit 12 is connected to the bottom end of the lifting conduit 11. The entire set of conduits is adjusted so that the connecting conduit 12 at its end extends into the predetermined position at the bottom of the pile hole. After the initial positioning is completed, the limiting mechanism is activated to securely clamp the conduit. This mechanism is driven by the second motor 15 to rotate the bidirectional lead screw 16. Since the threads at both ends of the lead screw rotate in opposite directions, the two limiting plates 20 move synchronously towards each other along the guide rod 18, thereby clamping the outer wall of the connecting conduit 12 and ensuring the verticality and stability of the conduit during the subsequent grouting process. At the same time, the control box 22 located on the third support plate 21 at the bottom of the support frame 2, through electrical connection with the height sensor 23, begins to monitor the rise height of the concrete surface inside the pile hole in real time.

[0037] The grouting operation begins. Concrete slurry is continuously injected into the funnel 3 fixed to the top of the support frame 2. The operator issues a command through the control box 22 to start the bidirectional mixing mechanism. Specifically, the control box 22 controls the first motor 5 to rotate clockwise, for example. The first motor 5 drives the drive sprocket 6 to rotate, and transmits the power to the driven sprocket 8 through the chain 7, which in turn drives the hollow rotating rod 9, which is coaxially fixed to the driven sprocket, to rotate clockwise. Multiple mixing rods 10, which are evenly spaced circumferentially and axially on the outer wall of the hollow rotating rod 9, rotate within the funnel 3 to continuously mix the stored concrete.

[0038] While stirring, the pouring is carried out simultaneously. Since the top of the lifting conduit 11 is movably connected to the bottom of the rotating hollow rod 9 via a mode conversion mechanism, this mechanism determines the motion state of the lifting conduit 11. A key component of the mode conversion mechanism is a guide block 27, which is fixed to a connecting shaft 25. The connecting shaft 25 is rotatably connected to the top of the lifting conduit 11, and a torsion spring 26 is provided between them. When the hollow rod 9 rotates forward, the threaded portion at the bottom of its inner wall comes into play. The threaded portion consists of a horizontal annular groove 28 and a spiral groove 29 communicating with it. During forward rotation, the guide block 27, under the preload of the torsion spring 26, always slides within the horizontal annular groove 28. This engagement ensures that the lifting conduit 11 does not rise or fall with the rotation of the hollow rod 9, but remains at its initial vertical height. At this time, the bottoms of the multiple slurry inlets 24 located at the top of the side wall of the lifting conduit 11 are precisely above the bottom outlet of the funnel 3 and are in an open state. Under the influence of gravity, the mixed concrete slurry flows into the lifting guide pipe 11 through these slurry inlet holes 24, and is then poured into the bottom of the pile hole through the connecting guide pipe 12 connected in series below, starting to fill the pile hole from bottom to top.

[0039] As the grouting continues, the concrete level inside the pile hole rises steadily. When the control box 22 receives a signal from the height sensor 23 confirming that the concrete has reached the predetermined height for removing a section of the guide pipe, the system automatically enters the guide pipe lifting and removal cycle. First, the control box 22 instructs the second motor 15 of the limit mechanism to reverse, driving the two limit plates 20 to move in opposite directions, releasing the clamp on the connecting guide pipe 12. Immediately afterwards, the control box 22 controls the first motor 5 of the bidirectional mixing mechanism to rotate counterclockwise in the opposite direction.

[0040] The reverse rotation of the first motor 5 drives the hollow rotating rod 9 to rotate in the opposite direction via chain drive. This change in rotation direction triggers the function switch of the mode switching mechanism. Initially, the guide block 27 is still within the annular groove 28. When the hollow rotating rod 9 rotates in the opposite direction to a specific position, aligning the connection between the annular groove 28 and the spiral groove 29 with the guide block 27, the compressed torsion spring 26 releases its stored elastic potential energy, generating a momentary torque that pushes the connecting shaft 25 and the guide block 27 to undergo a slight angular displacement. It is this action that causes the guide block 27 to slide from the annular groove 28 and engage with the starting end of the spiral groove 29.

[0041] Once the guide block 27 enters the spiral groove 29, the continued reverse rotation of the hollow rotating rod 9 passes through the inclined surface of the spiral groove 29, forcing the guide block 27 to drive the entire lifting guide pipe 11 to rise vertically. The rise of the lifting guide pipe 11 simultaneously lifts all the connected guide pipes 12 below it. This lifting process continues until the lifting guide pipe 11 rises to a sufficient height so that the grout inlet 24 on its side wall is completely blocked and sealed by the inner wall of the hollow rotating rod 9, at which point the concrete stops flowing into the guide pipe system. The rising height also ensures that the connection part of the uppermost connecting guide pipe 12 is fully exposed.

[0042] At this point, construction workers can easily dismantle the conduits. The first connecting conduit 12 is removed from the series. After dismantling, the top of the remaining connecting conduit 12 is reconnected to the bottom of the lifting conduit 11. Then, the first motor 5 is restarted in the forward direction via the control box 22. The hollow rotating rod 9 resumes forward rotation, and the guide block 27, guided by the spiral groove 29, lowers the lifting conduit 11 and the remaining connecting conduits 12 as a whole until they return to their initial installation height. During this process, when the guide block 27 reaches the connection between the spiral groove 29 and the annular groove 28, it slides back into the annular groove 28, and the system returns to the "forward rotation - mixing and pouring only" mode. Simultaneously, the grout inlet 24 reopens. Immediately afterward, the second motor 15 of the limiting mechanism rotates forward, driving the limiting plate 20 to clamp the uppermost connecting conduit 12 again, re-fixing the entire conduit system. After these steps are completed, concrete is added to the funnel 3, and the system immediately resumes continuous mixing and pouring operations.

[0043] Step three of the above-mentioned "pouring-lifting and demolition-resetting" process can be coordinated and controlled by the control box 22 to be executed cyclically based on the feedback from the height sensor 23 until the concrete pouring of the pile body reaches the design elevation, thus completing step four of the entire pile foundation construction.

[0044] This invention achieves intelligent switching between two functions of a single power source, the first motor 5, through the ingenious combination of a bidirectional mixing mechanism, a first motor 5, a sprocket and chain drive, a hollow rotating rod 9, a mixing rod 10, and a mode conversion mechanism guide block 27, a connecting shaft 25, a torsion spring 26, an annular groove 28, and a spiral groove 29. When rotating forward, it drives the mixing and keeps the conduit stationary for grouting; when rotating in reverse, it automatically switches to a conduit lifting mode, creating conditions for dismantling the conduit. This not only completely avoids the heavy labor of repeatedly hoisting and calibrating the large hopper (in this case, a fixed funnel 3) in traditional construction, but also achieves rapid and seamless connection between conduit dismantling and grouting operations, greatly improving construction efficiency and continuity. Furthermore, the fixed funnel 3 combined with continuous mixing by the mixing rod 10 effectively maintains the workability of the concrete, reducing the risk of laitance and aggregate segregation. Simultaneously, the feeding through the grout inlet 24 and the reasonable embedment depth control of the conduit in the concrete promotes more uniform diffusion and rising of the concrete within the pile hole. With the assistance of the control box 22 and the second motor 15, bidirectional lead screw 16, and limit plate 20 of the limit mechanism, the entire process achieves higher automation and controllability, thereby significantly improving the mechanization level, work efficiency and pile quality of bridge pile foundation grouting construction.

[0045] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0046] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. A rotary drilling and grouting device for bridge pile foundations, characterized in that, include: Support frame (2) is set above pile hole (1); A funnel (3) is fixedly connected to the top of the support frame (2), and the funnel (3) is used to store slurry; A bidirectional stirring mechanism is fixedly connected to the top of the support frame (2), and the stirring end of the bidirectional stirring mechanism is located inside the funnel (3); The lifting guide tube (11) is sealed and slidably connected to the bottom end of the funnel (3). The top end of the lifting guide tube (11) is movably connected to the bottom of the stirring end of the bidirectional stirring mechanism. Multiple slurry inlet holes (24) are opened on the top side wall of the lifting guide tube (11). The mode conversion mechanism is movably disposed at the top of the lifting guide tube (11). When the bidirectional stirring mechanism rotates in the forward direction, the mode conversion mechanism is used to drive the lifting guide tube (11) to rotate relative to the bidirectional stirring mechanism. When the bidirectional stirring mechanism rotates in the reverse direction, the mode conversion mechanism is used to drive the lifting guide tube (11) to rise relative to the bidirectional stirring mechanism. Multiple connecting conduits (12) are detachably connected end to end to the bottom of the lifting conduit (11); A limiting mechanism is fixedly connected to the bottom end of the support frame (2), and the limiting mechanism is used to limit and stabilize the connecting conduit (12); The control box (22) is fixedly connected to the bottom of the support frame (2). The control box (22) is electrically connected to a height sensor (23). The control box (22) is electrically connected to the bidirectional stirring mechanism and the limiting mechanism.

2. The bridge pile foundation rotary drilling and grouting device according to claim 1, characterized in that, The bidirectional stirring mechanism includes a first tray (4), which is fixedly connected to the top of the support frame (2). A first motor (5) is fixedly connected to the top of the first tray (4). The output shaft of the first motor (5) is coaxially fixedly connected to a drive sprocket (6). The drive sprocket (6) is driven by a driven sprocket (8) via a chain (7). A stirring part is coaxially fixedly connected inside the driven sprocket (8). The stirring part is located inside the funnel (3).

3. The bridge pile foundation rotary drilling and grouting device according to claim 2, characterized in that, The stirring part includes a hollow rotating rod (9), the top end of which is coaxially fixedly connected to the inside of the driven sprocket (8). A horizontal plate (32) is rotatably connected to the middle of the outer wall of the hollow rotating rod (9) through a bearing. The horizontal plate (32) is fixedly connected to the top end of the support frame (2). A plurality of stirring rods (10) are fixedly connected to the bottom of the outer wall of the hollow rotating rod (9). The plurality of stirring rods (10) are equally spaced along the circumferential and axial directions of the outer wall of the hollow rotating rod (9). A threaded part is provided on the inner side wall of the hollow rotating rod (9). The top end of the lifting guide tube (11) is movably disposed inside the bottom end of the hollow rotating rod (9). The mode conversion mechanism is driven and cooperated with the threaded part.

4. The bridge pile foundation rotary drilling and grouting device according to claim 3, characterized in that, The threaded portion includes an annular groove (28) and a spiral groove (29). The annular groove (28) is formed at the bottom of the inner wall of the hollow rotating rod (9) and is horizontally arranged. The spiral groove (29) is formed at the inner wall of the hollow rotating rod (9) and its bottom end is connected to the annular groove (28).

5. A bridge pile foundation rotary drilling and grouting device according to claim 4, characterized in that, The mode conversion mechanism includes a connecting shaft (25), which is rotatably connected to the top end of the lifting guide tube (11). A torsion spring (26) is sleeved on the outside of the connecting shaft (25). The torsion spring (26) is located inside the lifting guide tube (11). One end of the torsion spring (26) is fixedly connected to the outer wall of the connecting shaft (25), and the other end of the torsion spring (26) is fixedly connected to the inner wall of the lifting guide tube (11). A guide block (27) is fixedly connected to one end of the connecting shaft (25). The guide block (27) is located outside the lifting guide tube (11), and the guide block (27) slides in cooperation with the annular groove (28) and the spiral groove (29).

6. A bridge pile foundation rotary drilling and grouting device according to claim 1, characterized in that, A limiting ring (13) is fixedly connected to the top of the outer wall of the connecting conduit (12).

7. A bridge pile foundation rotary drilling and grouting device according to claim 1, characterized in that, The limiting mechanism includes two second support plates (14), which are fixedly connected to the bottom end of the support frame (2). A second motor (15) is fixedly connected to one top end of one second support plate (14). The output shaft of the second motor (15) is coaxially fixedly connected to one end of a bidirectional lead screw (16). The threads of the two ends of the bidirectional lead screw (16) are opposite. The other end of the bidirectional lead screw (16) is rotatably connected to a first fixed seat (17). The first fixed seat (17) is fixedly connected to one top end of the other second support plate (14). Both ends of the bidirectional lead screw (16) are threadedly connected to limit plates (20). The ends of the two limit plates (20) away from the bidirectional lead screw (16) are slidably connected to a guide rod (18). The guide rod (18) is fixedly connected to the top end of the second support plate (14) through a second fixed seat (19).

8. A bridge pile foundation rotary drilling and grouting device according to claim 1, characterized in that, The support frame (2) is fixedly connected to the bottom end of the third support plate (21), and the control box (22) is fixedly connected to the top end of the third support plate (21).

9. A bridge pile foundation rotary drilling and grouting device according to claim 1, characterized in that, Two connecting blocks (30) are fixedly connected to the outer wall of the funnel (3). The two connecting blocks (30) are symmetrically arranged on both sides of the funnel (3). The connecting blocks (30) are fixedly connected to the top of the support frame (2) through the fixing plate (31).

10. A method for rotary drilling and grouting construction of bridge pile foundations, characterized in that, Based on the bridge pile foundation rotary drilling grouting device according to any one of claims 1-9, the method includes the following steps: Step 1: Install a fixed support frame (2) above the pile hole (1), connect multiple connecting pipes (12) end to end, connect the first connecting pipe (12) with the lifting pipe (11), extend the end connecting pipe (12) into the predetermined position at the bottom of the pile hole (1), calibrate the relative position of the connecting pipe (12) and the pile hole (1), and start the limiting mechanism to fix and clamp the connecting pipe (12); Step 2: Inject slurry into the funnel (3), start the bidirectional stirring mechanism to rotate in the forward direction to stir the slurry, and at the same time, the slurry enters the lifting guide pipe (11) through the slurry inlet hole (24), and finally enters the pile hole (1) through the connecting guide pipe (12); Step 3: When the grout in the pile hole (1) rises to the predetermined height, release the limiting mechanism from fixing the connecting pipe (12), then drive the bidirectional mixing mechanism to rotate in the opposite direction, causing the lifting pipe (11) and connecting pipe (12) to rise. Then remove the first connecting pipe (12) and connect the remaining connecting pipe (12) back to the lifting pipe (11). Then drive the bidirectional mixing mechanism to rotate in the forward direction again to lower the lifting pipe (11) and connecting pipe (12) to the height at which they were installed. Then start the limiting mechanism again to fix the connecting pipe (12) and continue grouting. Step 4: Repeat step 3 until the pile body is poured.

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