Precast pile local grouting reinforcement construction device

Abstract

The invention provides a precast pile local grouting reinforcement construction device which comprises a sliding seat and further comprises a grouting connecting assembly, an extension communicating assembly, a stirring drill bit assembly and a rotary driving assembly. In the drilling process, in the process that the rotary driving assembly is used for driving and the stirring drill bit assembly rotates in the first direction for drilling, an expanding drill bit part of the stirring drill bit assembly is in a storage state, drilling and hole drilling are conducted on the ground, and when hole expanding is needed, the driving direction is changed through the rotary driving assembly; in the process that the stirring drill bit assembly rotates in the second direction opposite to the first direction to conduct reaming, the reaming drill bit part of the stirring drill bit assembly is in the reaming state, automatic reaming is conducted on the local position deep in the hole, the working state of the reaming component is adjusted according to needs, reaming is conducted on the local position of the hole, and the reaming efficiency is improved. The reaming mode of the stirring drill bit assembly is enriched, and the application range of the stirring drill bit assembly is widened.

Description

Technical Field

[0001] This invention belongs to the field of pile foundation reinforcement construction, and in particular relates to a precast pile local grouting reinforcement construction device. Background Technology

[0002] Single pile type and foundation treatment technology are difficult to achieve ideal economic and technical results. However, rigid composite pile is a new foundation treatment technology in recent years. It is a composite pile type formed by inserting a high-strength concrete core pile into the center of the cement-soil mixing pile after the cement-soil mixing pile is formed and before the cement-soil initially sets.

[0003] Based on the principle of long-core stiff composite pile technology, cement-soil reinforcement measures can be adopted in local sections of the pile body for existing pile foundations that have met the vertical bearing capacity design requirements. By improving the bending stiffness and lateral resistance of the pile body, the bearing capacity requirements of the elevated platform basement structure for horizontal loads can be met without the need to increase the number of pile foundations.

[0004] In the process of local grouting reinforcement of precast piles, holes are first drilled using a cement-soil mixing drill bit assembly. Then, holes are drilled in the ground, and materials such as cement, fly ash, and bentonite are mixed into a paste-like slurry. The paste-like slurry is injected into the hole through the cement-soil mixing drill bit. Finally, the precast pile is implanted into the hole containing the paste-like slurry. However, in the mixing drilling process, the drilling method of the mixing drill bit is singular, which makes it inconvenient to expand and reinforce local areas within the hole as needed, thus limiting the application range of the cement-soil mixing drill bit assembly. Summary of the Invention

[0005] In view of this, the present invention aims to propose a precast pile local grouting reinforcement construction device to solve the technical problem that, in the process of mixing drilling, the drilling method of the mixing drill bit is singular, which makes it inconvenient to enlarge and reinforce local parts of the hole as needed, thus limiting the application range of cement-soil mixing drill bit components.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A precast pile partial grouting reinforcement construction device includes a sliding seat, a grouting connection assembly, an extension connection assembly, a mixing drill bit assembly, and a rotary drive assembly. The grouting connection assembly is rotatably mounted on the sliding seat. The grouting connection assembly and the mixing drill bit assembly are connected through the extension connection assembly. The grouting connection assembly is used to guide grout into the extension connection assembly, and then the extension connection assembly guides the grout to the mixing drill bit assembly. The mixing drill bit assembly includes a fixed drill bit and an enlarging drill bit. The mixing drill bit assembly injects grout into the drilled hole. During drilling, when the mixing drill bit assembly rotates in a first direction, the enlarging drill bit of the mixing drill bit assembly is in a retracted state. When the mixing drill bit assembly rotates in a second direction opposite to the first direction to enlarge the hole, the enlarging drill bit of the mixing drill bit assembly is in an enlarging state. The rotary drive assembly is mounted on the sliding seat and is used to drive the grouting connection assembly to rotate.

[0008] Furthermore, the grouting connection assembly includes a first connecting pipe, which is rotatably connected to the slide block. A connecting pipe is fixedly connected to the top end of the first connecting pipe, and a first external connecting pipe is rotatably connected to the top end of the connecting pipe.

[0009] Furthermore, the stirring drill assembly includes a second connecting pipe, the fixing drill bit is fixedly connected to the bottom end of the second connecting pipe, the enlarging drill bit is sleeved on the surface of the second connecting pipe, and the second connecting pipe and the first connecting pipe are connected by an extension connecting assembly.

[0010] Furthermore, the extended communication component includes a third communication tube, the two ends of which are fixedly connected to the bottom end of the first communication tube and the top end of the second communication tube, respectively.

[0011] Furthermore, the enlarged drill bit assembly includes a hydraulic pump connecting assembly, an annular seat, three piston plates, and a sleeve. The annular seat is fixedly fitted onto the surface of the second connecting pipe, and a first annular cavity is formed at the bottom of the annular seat.

[0012] The sleeve is fitted onto the surface of the second connecting pipe. Three connecting cavities are fixedly connected to the surface of the sleeve. A second annular cavity is opened at the top of the sleeve. The top of the sleeve is fixed to the annular seat by screws. The second annular cavity is connected to the first annular cavity. The second annular cavity is connected to the top of the three connecting cavities through a first connecting channel. The three piston plates are slidably disposed inside the three connecting cavities. A connecting post is fixedly connected to the bottom of the piston plate. A moving ring is fixedly connected between the bottoms of the three connecting posts. The moving ring is fitted onto the surface of the second connecting pipe. Three inclined connecting frames are rotatably connected to the surface of the moving ring. A first cutting tooth is fixedly connected to the connecting frame. A mounting frame is rotatably connected to the top of each of the three connecting frames. The mounting frame has a clearance cavity. An annular frame is slidably disposed in the clearance cavity of the three mounting frames. Three supports are fixedly connected to the inner ring wall of the annular frame. The three supports pass through the three connecting frames respectively. A connecting ring is fixedly connected between the ends of the three supports. The connecting ring is fixedly connected to the surface of the second connecting pipe.

[0013] The top of the mounting bracket is rotatably provided with an enlarged hole component, and the hydraulic pump connecting assembly is used to connect the first annular cavity to an external hydraulic pump.

[0014] Furthermore, the hydraulic pump connection assembly includes a first oil passage, a second oil passage, a third oil passage, and an annular groove. The first oil passage is located at the top end of the first connecting pipe. The annular groove is fixedly connected to the top end of the first connecting pipe and communicates with the first oil passage. An annular cover is slidably connected to the top opening of the annular groove. A second external pipe is fixedly connected to the top of the annular cover. The second oil passage is located at the top end of the second connecting pipe. A first connecting hole is provided on the inner sidewall of the first annular cavity. The first connecting hole penetrates the second connecting pipe and extends into the second oil passage. The third oil passage is located at the top of the third connecting pipe. Both ends of the third oil passage are respectively connected to the first oil passage and the second oil passage.

[0015] Furthermore, the hole-expanding component includes a support shaft, which is rotatably connected to the top of the connecting frame. An adjusting frame is fixedly connected to the top of the support shaft. Hole-expanding teeth are fixedly connected to the outer end of the adjusting frame, and blades are fixedly connected to the inner end of the adjusting frame. A limit rod is also fixedly connected to the inner end of the adjusting frame.

[0016] Furthermore, the rotary drive assembly includes a first follower gear and a motor. The first follower gear is fixedly connected to the surface of the first connecting pipe, the motor is fixedly connected to the top of the slide, and a drive gear is fixedly connected to the output end of the motor. The drive gear meshes with the first follower gear.

[0017] Furthermore, a second stirring blade is fixedly connected to the surface of the second connecting pipe, and a third stirring blade is fixedly connected to the surface of the third connecting pipe.

[0018] Furthermore, a support base is fixedly connected to the top of the slide, and a pulley is rotatably connected to the top of the support base.

[0019] Compared with existing technologies, the precast pile local grouting reinforcement construction device of the present invention has the following beneficial effects:

[0020] (1) In the drilling process, the present invention is driven by a rotary drive assembly. During the drilling process, the stirring drill bit assembly rotates in the first direction and the enlarged drill bit of the stirring drill bit assembly is in the storage state. Drilling is carried out on the ground and a hole is drilled. When the hole needs to be enlarged, it is in the grouting state. The driving direction is changed by the rotary drive assembly. During the hole enlargement process, the stirring drill bit assembly rotates in the second direction opposite to the first direction and the enlarged drill bit of the stirring drill bit assembly is in the hole enlargement state. Automatic hole enlargement is performed for local positions deep in the hole. The working state of the hole enlargement component can be adjusted as needed to meet the needs of hole enlargement at local positions in the hole. This makes the hole enlargement method of the stirring drill bit assembly richer and expands the application range of the stirring drill bit assembly.

[0021] (2) In the process of the hydraulic pump pumping hydraulic oil, the hydraulic oil is pumped through the hydraulic pump connecting component by an external hydraulic pump, so that the hydraulic oil flows inside the first annular cavity, the second annular cavity, the first connecting channel and the connecting cavity, generating negative pressure. The external atmospheric pressure will push the piston plate, and the piston plate will adjust the position of the moving ring by moving upward through the connecting column, reducing the distance between the moving ring and the connecting ring. The connecting frame will push the mounting frame to move on the support body, and the mounting frame will simultaneously drive the hole-expanding component to move to the outer edge of the annular frame, increasing the hole-expanding range.

[0022] During the process of the hydraulic pump pumping and injecting hydraulic oil, the external hydraulic pump pumps the hydraulic oil through the hydraulic pump connecting assembly, so that the hydraulic oil flows inside the first annular cavity, the second annular cavity, the first connecting channel and the connecting cavity. The hydraulic oil pushes the piston plate, and the piston plate adjusts the position of the moving ring downward through the connecting column, increasing the distance between the moving ring and the connecting ring. The connecting frame pushes the mounting frame to move on the support body, and the mounting frame synchronously drives the hole-expanding component to move, reducing the hole-expanding range.

[0023] During the drilling process in the first direction, when the mixing drill bit assembly is in the grouting state, the grout resistance will push the blades to rotate automatically to the retracted state. At this time, the limit rod will abut against the protruding section to limit the state of the adjusting frame.

[0024] During the drilling process when the mixing drill bit assembly rotates in the second direction, it is in the grouting state. The grout resistance will push the blades to rotate automatically to the hole enlargement state. At this time, the limit rod will abut against the surface of the mounting frame to limit the state of the adjustment frame. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a schematic diagram of the first overall structure of a precast pile local grouting reinforcement construction device according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 Enlarged view of section A:

[0028] Figure 3 for Figure 1 Enlarged view of section B;

[0029] Figure 4 This is a schematic diagram of the mixing drill bit assembly of a precast pile local grouting reinforcement construction device according to an embodiment of the present invention;

[0030] Figure 5 This is a first cross-sectional view of the connecting frame, mounting frame, support shaft, adjusting frame, hole enlarging teeth, and blades of a precast pile local grouting reinforcement construction device according to an embodiment of the present invention;

[0031] Figure 6 This is a first cross-sectional view of the mixing drill bit assembly of a precast pile local grouting reinforcement construction device according to an embodiment of the present invention;

[0032] Figure 7 for Figure 6 Enlarged view of section C;

[0033] Figure 8 for Figure 6 Enlarged view of section D in the middle;

[0034] Figure 9 This is a second cross-sectional view of the mixing drill bit assembly of a precast pile local grouting reinforcement construction device according to an embodiment of the present invention;

[0035] Figure 10 for Figure 9 Enlarged view of section E in the middle;

[0036] Figure 11 This is a cross-sectional view of the sliding seat, first connecting pipe, second connecting pipe and third connecting pipe of a precast pile local grouting reinforcement construction device according to an embodiment of the present invention;

[0037] Figure 12 for Figure 11 Enlarged view of section F in the middle;

[0038] Figure 13 for Figure 11 Enlarged view of section G in the middle;

[0039] Figure 14 for Figure 11 Enlarged view of section H in the middle.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1-Slide seat; 2-First connecting pipe; 3-Connecting pipe; 4-First external connecting pipe; 5-First follower gear; 6-Motor; 7-Drive gear; 8-Second connecting pipe; 9-Grouting port; 10-Third connecting pipe; 11-Sleeve; 12-Annular seat; 13-First annular cavity; 14-Connecting cavity; 15-Second annular cavity; 16-First connecting channel; 17-Piston plate; 18-Connecting column; 19-Moving ring; 20-Connecting frame; 21-Limiting rod; 22-Second stirring blade; 23-Third stirring blade 24-First oil passage; 25-Second oil passage; 26-Third oil passage; 27-Annular groove; 28-Annular cover; 2801-Second external pipe; 29-First connecting hole; 30-First cutting tooth; 31-Mounting bracket; 3101-Relief cavity; 3102-Protruding section; 32-Annular frame; 33-Support body; 34-Fixing drill bit component; 35-Connecting ring; 36-Support seat; 37-Pulley; 38-Support shaft; 39-Adjusting bracket; 40-Enlarging tooth; 41-Blade. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not 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 the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] like Figures 1 to 14 As shown, in one embodiment, a precast pile local grouting reinforcement construction device includes a sliding seat 1, a grouting connection assembly, an extension connection assembly, a mixing drill bit assembly, and a rotary drive assembly. The grouting connection assembly is rotatably mounted on the sliding seat 1. The grouting connection assembly and the mixing drill bit assembly are connected through the extension connection assembly. The grouting connection assembly is used to guide grout into the extension connection assembly, and then the extension connection assembly guides the grout to the mixing drill bit assembly. The mixing drill bit assembly includes a fixed drill bit 34 and a rotary adjustable enlarging drill bit. The mixing drill bit assembly injects grout into the drilled hole. During the drilling process, when the mixing drill bit assembly rotates in the first direction a to drill, the enlarging drill bit of the mixing drill bit assembly is in a retracted state. When the mixing drill bit assembly rotates in the second direction b, which is opposite to the first direction a, to enlarge the hole, the enlarging drill bit of the mixing drill bit assembly is in an enlarging state. The rotary drive assembly is mounted on the sliding seat 1 and is used to drive the grouting connection assembly to rotate.

[0047] A support base 36 is fixedly connected to the top of the slide 1, and a pulley 37 is rotatably connected to the top of the support base 36.

[0048] It should be understood that during the reinforcement construction process, the traction rope of the traction equipment is connected to the pulley 37, and the slide block 1 is lifted by winding the traction rope. By releasing the traction rope, the slide block 1 will descend under the action of gravity. The slide block 1, the grouting connection assembly, the extension connection assembly, the mixing drill bit assembly and the rotary drive assembly will descend as a whole. The slide block 1 is slidably connected to the tilting frame of the traction equipment.

[0049] The specific grouting method is as follows;

[0050] Step 1: The rope is released through the external traction device. Under the action of gravity, the slide block 1 will descend. The slide block 1, grouting connection assembly, extension connection assembly, mixing drill bit assembly and rotary drive assembly will descend to contact the ground. Driven by the rotary drive assembly, the grouting connection assembly, extension connection assembly and mixing drill bit assembly will rotate in the first direction a. The enlarged drill bit of the mixing drill bit assembly is in the retracted state. The mixing drill bit assembly will drill a hole in the soil layer and stir the inside during the drilling process. After drilling the hole to the required depth, the mixing drill bit assembly is pulled to a local position in the hole as needed. Then, the driving direction is changed by the rotary drive assembly. The mixing drill bit assembly rotates in the second direction b, which is opposite to the first direction a. The enlarged drill bit of the mixing drill bit assembly is in the hole-enlarging state. During the rotation, the enlarged drill bit will enlarge a local position in the hole. Then, the mixing drill bit assembly is pulled to move and adjust the hole-enlarging position.

[0051] Step 2: Mix cement, fly ash, bentonite and other materials into a paste-like slurry. Then, use a pump to inject the paste-like slurry into the grouting connection component through a hose. The paste-like slurry flows down the extension connection component to the mixing drill bit component and is discharged through the grouting port 9 on the mixing drill bit to achieve grouting.

[0052] Step 3: After hole enlargement and grouting, the precast pile is inserted into the grouted hole, providing support around the pile through a mixture of paste-like grout and soil. It should be understood that by enlarging the hole, a localized area is enlarged, and the resulting paste-like grout and soil mixture in the enlarged area reinforces the precast pile in that specific section, thereby increasing its bending stiffness and lateral resistance.

[0053] The grouting connection assembly includes a first connecting pipe 2, which is rotatably connected to a slide block 1. A connecting pipe 3 is fixedly connected to the top end of the first connecting pipe 2, and a first external connecting pipe 4 is rotatably connected to the top end of the connecting pipe 3. It should be understood that the first external connecting pipe 4 is connected to an external pump via a flexible hose. The pump delivers the paste-like grout into the flexible hose, and then the paste-like grout passes through the first external connecting pipe 4 and sequentially enters the connecting pipe 3 and the first connecting pipe 2. The first connecting pipe 2 rotates under the action of the rotational drive assembly. The rotational connection between the connecting pipe 3 and the first external connecting pipe 4 provides a degree of freedom, preventing interference.

[0054] The rotary drive assembly includes a first follower gear 5 and a motor 6. The first follower gear 5 is fixedly connected to the surface of the first connecting pipe 2, and the motor 6 is fixedly connected to the top of the slide 1. A drive gear 7 is fixedly connected to the output end of the motor 6, and the drive gear 7 meshes with the first follower gear 5. It should be understood that when it is necessary to drive the stirring drill assembly to rotate, the motor 6 is started, the motor 6 drives the drive gear 7 to rotate, the drive gear 7 transmits the first follower gear 5, the first follower gear 5 drives the first connecting pipe 2 to rotate, and the first connecting pipe 2 drives the extended connecting assembly and the stirring drill assembly to rotate synchronously.

[0055] The mixing drill bit assembly includes a second connecting pipe 8, a fixed drill bit component 34 fixedly connected to the bottom end of the second connecting pipe 8, an enlarged drill bit component sleeved on the surface of the second connecting pipe 8, the second connecting pipe 8 and the first connecting pipe 2 are connected by an extension connecting component, and a grouting port 9 is provided at the bottom end of the surface of the second connecting pipe 8.

[0056] The extended communication component includes a third communication pipe 10, the two ends of which are respectively bolted to the bottom end of the first communication pipe 2 and the top end of the second communication pipe 8, and the two ends of the third communication pipe 10 are respectively connected to the bottom end of the first communication pipe 2 and the top end of the second communication pipe 8.

[0057] It should be understood that the paste-like slurry passing through the first connecting pipe 2 will enter the second connecting pipe 8 under the guidance of the third connecting pipe 10, and will be injected into the drilled hole through the grouting port 9.

[0058] like Figure 1 , 3 , Figures 4 to 14 As shown, in one embodiment, the enlarged drill bit assembly includes a hydraulic pump connecting assembly, an annular seat 12, three piston plates 17 and a sleeve 11. The annular seat 12 is fixedly sleeved on the surface of the second connecting pipe 8, and a first annular cavity 13 is formed at the bottom of the annular seat 12.

[0059] A sleeve 11 is fitted onto the surface of the second connecting pipe 8. Three connecting cavities 14 are fixedly connected to the surface of the sleeve 11. A second annular cavity 15 is formed at the top of the sleeve 11. The top of the sleeve 11 is fixed to the annular seat 12 by screws. The second annular cavity 15 is connected to the first annular cavity 13. The second annular cavity 15 is connected to the top of each of the three connecting cavities 14 through a first connecting channel 16. Three piston plates 17 are slidably disposed inside the three connecting cavities 14. A connecting post 18 is fixedly connected to the bottom of the piston plate 17. A moving ring 19 is fixedly connected between the bottoms of the three connecting posts 18. Three inclined connecting frames 20 are rotatably connected to the surface of the moving ring 19 on the surface of the second connecting pipe 8. A first cutting tooth 30 is fixedly connected to the connecting frame 20. A mounting frame 31 is rotatably connected to the top of each of the three connecting frames 20. The mounting frame 31 has a relief cavity 3101. A ring frame 32 is slidably arranged in the relief cavity 3101 of the three mounting frames 31. Three supports 33 are fixedly connected to the inner ring wall of the ring frame 32. The three supports 33 pass through the three connecting frames 20 respectively. A connecting ring 35 is fixedly connected between the ends of the three supports 33. The connecting ring 35 is fixedly connected to the surface of the second connecting pipe 8.

[0060] The top of the mounting bracket 31 is rotatably provided with an enlarged hole component, and the hydraulic pump connection assembly is used to connect the first annular cavity 13 to an external hydraulic pump.

[0061] A second stirring blade 22 is fixedly connected to the surface of the second connecting pipe 8, and a third stirring blade 23 is fixedly connected to the surface of the third connecting pipe 10.

[0062] It should be understood that during the drilling process, hydraulic oil is pumped into the hydraulic pump through the hydraulic pump connecting assembly by an external hydraulic pump, so that the hydraulic oil flows inside the first annular cavity 13, the second annular cavity 15, the first connecting channel 16 and the connecting cavity 14, thereby pushing the piston plate 17. The piston plate 17 adjusts the position of the moving ring 19 through the connecting column 18.

[0063] When the moving ring 19 is stationary, the hydraulic oil is stopped pumping and the hydraulic oil flow space is closed. Under the action of hydraulic pressure, the piston plate 17 is stationary in the connecting cavity 14. The piston plate 17 supports the position of the connecting column 18 and the moving ring 19. The moving ring 19 supports the state of the three inclined connecting frames 20. The connecting frames 20 support the position of the mounting frame 31. The mounting frame 31 supports the position of the reaming mechanism. During the drilling process, the rotating drive assembly drives the drilling. During the drilling process, the reaming component automatically rotates and is in a retracted state while the stirring drill bit assembly rotates in the first direction a. Drilling is performed on the ground to create a hole. When reaming is required, the rotating drive assembly changes the driving direction. During the reaming process, the stirring drill bit assembly rotates in the second direction b, which is opposite to the first direction a. The reaming component automatically rotates and is in a reaming state, automatically reaming the hole in a local position deep in the hole. This realizes the ability to adjust the working state of the reaming component as needed to meet the requirements of reaming in a local position of the hole.

[0064] When it is necessary to adjust the position of the hole-reaming component to adjust the hole-reaming range, hydraulic oil is pumped and injected.

[0065] During the process of the hydraulic pump drawing hydraulic oil, the external hydraulic pump draws the hydraulic oil through the hydraulic pump connecting assembly, causing the hydraulic oil to flow inside the first annular cavity 13, the second annular cavity 15, the first connecting channel 16, and the connecting cavity 14, generating negative pressure. The external atmospheric pressure pushes the piston plate 17, and the piston plate 17 adjusts the position of the moving ring 19 upward through the connecting column 18, reducing the distance between the moving ring 19 and the connecting ring 35. The connecting frame 20 pushes the mounting frame 31 to move on the support body 33, and the mounting frame 31 simultaneously drives the hole-expanding component to move towards the outer edge of the annular frame 32, increasing the hole-expanding range.

[0066] During the process of the hydraulic pump pumping and injecting hydraulic oil, the hydraulic oil is pumped and injected through the hydraulic pump connecting component by the external hydraulic pump, so that the hydraulic oil flows inside the first annular cavity 13, the second annular cavity 15, the first connecting channel 16 and the connecting cavity 14. The hydraulic oil pushes the piston plate 17, and the piston plate 17 adjusts the position of the moving ring 19 downward through the connecting column 18, thereby increasing the distance between the moving ring 19 and the connecting ring 35. The connecting frame 20 pushes the mounting frame 31 to move on the support body 33. The mounting frame 31 simultaneously drives the hole-expanding component to move, thereby reducing the hole-expanding range.

[0067] like Figures 6 to 14As shown, in one embodiment, the hydraulic pump connection assembly includes a first oil passage 24, a second oil passage 25, a third oil passage 26, and an annular groove 27. The first oil passage 24 is opened at the top end of the first connecting pipe 2. The annular groove 27 is fixedly connected to the top end of the first connecting pipe 2 and communicates with the first oil passage 24. An annular cover 28 is slidably connected to the top opening of the annular groove 27. A second outer pipe 2801 is fixedly connected to the top of the annular cover 28. The second oil passage 25 is opened at the top end of the second connecting pipe 8. A first connecting hole 29 is opened on the inner side wall of the first annular cavity 13. The first connecting hole 29 passes through the second connecting pipe 8 and extends into the second oil passage 25. The third oil passage 26 is opened through the top of the third connecting pipe 10. The two ends of the third oil passage 26 are respectively connected to the first oil passage 24 and the second oil passage 25. It should be understood that during the hole enlargement process, the external hydraulic pump is connected to the second external pipe 2801 through a hose. During the rotation drive of the first connecting pipe 2 by the rotation drive assembly, the sliding connection between the annular cover 28 and the top opening of the annular groove 27 provides the degree of freedom to avoid interference.

[0068] Hydraulic oil flows inside the first oil passage 24, the third oil passage 26, the second oil passage 25, the first annular cavity 13, the second annular cavity 15, the first connecting passage 16, and the connecting cavity 14.

[0069] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the hole-reaming component includes a support shaft 38, which is rotatably connected to the top of the connecting frame 20. An adjusting frame 39 is fixedly connected to the top of the support shaft 38. A hole-reaming tooth 40 is fixedly connected to the outer end of the adjusting frame 39, and a blade 41 is fixedly connected to the inner end of the adjusting frame 39. A limiting rod 21 is also fixedly connected to the inner end of the adjusting frame 39. The mounting frame 31 has a protruding section 3102. It should be understood that during the drilling process, as the drilling bit assembly rotates in the first direction a, the slurry resistance will push the blade 41 to automatically rotate to a retracted state. At this time, the limiting rod 21 will abut against the protruding section 3102, limiting the state of the adjusting frame 39.

[0070] During the drilling process, the grout resistance will push the blade 41 to rotate automatically to the hole enlargement state. At this time, the limit rod 21 will abut against the surface of the mounting frame 31 to limit the state of the adjusting frame 39.

[0071] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precast pile local grouting reinforcement construction device, comprising a sliding seat (1), characterized in that: It also includes a grouting connection assembly, an extension communication assembly, a mixing drill bit assembly and a rotary drive assembly. The grouting connection assembly is rotatably mounted on the slide (1). The grouting connection assembly and the mixing drill bit assembly are connected through the extension communication assembly. The mixing drill bit assembly includes a fixed drill bit (34) and an enlarged drill bit. The rotary drive assembly is mounted on the slide (1) and is used to drive the grouting connection assembly to rotate. The stirring drill bit assembly includes a second connecting pipe (8), and the enlarged drill bit assembly includes a hydraulic pump connecting assembly, an annular seat (12), three piston plates (17), and a sleeve (11). The annular seat (12) is fixedly fitted onto the surface of the second connecting pipe (8), and a first annular cavity (13) is opened at the bottom of the annular seat (12). The sleeve (11) is fitted onto the surface of the second connecting pipe (8), and three connecting cavities (14) are fixedly connected to the surface of the sleeve (11). A second annular cavity (15) is opened at the top of the sleeve (11), and the second annular cavity (15) is connected to the first annular cavity (13) and to the three connecting cavities (14). The three piston plates (17) are slidably disposed inside the three connecting cavities (14), and a connecting post (18) is fixedly connected to the bottom of the piston plate (17). A movable ring (19) is fixedly connected between the bottoms of the three connecting posts (18). The movable ring (19) is sleeved on the surface of the second connecting pipe (8). Three connecting frames (20) are rotatably connected to the surface of the movable ring (19). A first cutting tooth (30) is fixedly connected to the connecting frame (20). The top of each of the three connecting frames (20) is rotatably connected to a mounting frame (31). The mounting frame (31) has a relief cavity (3101). An annular frame (32) is slidably arranged in the relief cavity (3101) of the three mounting frames (31). Three supports (33) are fixedly connected to the inner annular wall of the annular frame (32). The three supports (33) pass through the three connecting frames (20) respectively. A connecting ring (35) is fixedly connected between the ends of the three supports (33). The connecting ring (35) is fixedly connected to the surface of the second connecting pipe (8). A hole-expanding component is rotatably arranged at the top of the mounting frame (31). The hydraulic pump connecting assembly is used to connect the first annular cavity (13) with an external hydraulic pump.

2. The precast pile local grouting reinforcement construction device according to claim 1, characterized in that: The grouting connection assembly includes a first connecting pipe (2), which is rotatably connected to a slide (1). The top end of the first connecting pipe (2) is fixedly connected to a connecting pipe (3), and the top end of the connecting pipe (3) is rotatably connected to a first external connecting pipe (4).

3. The precast pile local grouting reinforcement construction device according to claim 2, characterized in that: The fixed drill bit component (34) is fixedly connected to the bottom end of the second connecting pipe (8), and the enlarged drill bit component is sleeved on the surface of the second connecting pipe (8). The second connecting pipe (8) and the first connecting pipe (2) are connected by an extension connecting component.

4. The precast pile local grouting reinforcement construction device according to claim 3, characterized in that: The extended communication component includes a third communication tube (10), the two ends of which are fixedly connected to the bottom end of the first communication tube (2) and the top end of the second communication tube (8), respectively.

5. The precast pile local grouting reinforcement construction device according to claim 4, characterized in that: The hydraulic pump connecting assembly includes a first oil passage (24), a second oil passage (25), a third oil passage (26), and an annular groove (27). The first oil passage (24) is located at the top of the first connecting pipe (2). The annular groove (27) is fixedly connected to the top of the first connecting pipe (2) and communicates with the first oil passage (24). An annular cover (28) is slidably connected to the top opening of the annular groove (27). The top of the annular cover (28) is fixedly connected to... The second external pipe (2801) and the second oil passage (25) are opened at the top of the second connecting pipe (8). The first connecting hole (29) is opened on the inner side wall of the first annular cavity (13). The first connecting hole (29) passes through the second connecting pipe (8) and extends into the second oil passage (25). The third oil passage (26) is opened through the top of the third connecting pipe (10). The two ends of the third oil passage (26) are connected to the first oil passage (24) and the second oil passage (25) respectively.

6. The precast pile local grouting reinforcement construction device according to claim 4, characterized in that: The hole-expanding component includes a support shaft (38), which is rotatably connected to the top of the connecting frame (20). An adjusting frame (39) is fixedly connected to the top of the support shaft (38). A hole-expanding tooth (40) is fixedly connected to the outer end of the adjusting frame (39). A blade (41) is fixedly connected to the inner end of the adjusting frame (39). A limit rod (21) is also fixedly connected to the inner end of the adjusting frame (39).

7. A precast pile local grouting reinforcement construction device according to any one of claims 2 to 6, characterized in that: The rotary drive assembly includes a first follower gear (5) and a motor (6). The first follower gear (5) is fixedly connected to the surface of the first connecting pipe (2), and the motor (6) is fixedly connected to the top of the slide (1). The output end of the motor (6) is fixedly connected to a drive gear (7), which meshes with the first follower gear (5).

8. The precast pile local grouting reinforcement construction device according to claim 4, characterized in that: A second stirring blade (22) is fixedly connected to the surface of the second connecting pipe (8), and a third stirring blade (23) is fixedly connected to the surface of the third connecting pipe (10).

9. The precast pile local grouting reinforcement construction device according to claim 1, characterized in that: The top of the slide (1) is fixedly connected to a support (36), and the top of the support (36) is rotatably connected to a pulley (37).

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