A method for reinforcing by micro-pressure grouting and a grouting system

Abstract

The present invention discloses a micro-pressure grouting reinforcement method and a grouting system in the field of building construction technology, including a pile driver and a power frame. The power frame includes an installation frame and a support frame. The support frame is rotatably installed inside the installation frame. A group of grouting arms are slidably connected inside the support frame. Fixed chucks are installed on the inner sides of the grouting arms, and power heads are slidably connected thereto. The overall device of the present invention can make the most of the relatively limited space height, maximize the length of each drill pipe, thereby avoiding frequent rod connection, reducing the number of joints, maximizing the effective stroke of the power head, improving construction efficiency and quality. At the same time, it can adapt to various diameter rod bodies, meet various construction requirements, and is relatively flexible.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and specifically provides a micro-pressure grouting reinforcement method and a grouting system. Background Technique

[0002] The high-pressure rotary jet grouting MJS method (Metro Jet System) is based on the original high-pressure jet grouting method. By using a unique multi-hole pipe and a front-end forced slurry suction device, it realizes forced slurry discharge in the hole and in-situ pressure monitoring. By adjusting the forced slurry discharge volume, the in-situ pressure can be controlled, so that the deep mud discharge and the in-situ pressure are reasonably controlled, and the in-situ pressure is stabilized, which reduces the possibility of surface deformation during construction and greatly reduces the impact on the environment. The reduction of the in-situ pressure further ensures the pile forming diameter. Among the existing foundation reinforcement methods, the MJS method is widely used because of its excellent foundation reinforcement effect, wide application scenarios and less impact on the environment.

[0003] With the development of the urbanization process, more and more underground spaces are developed and utilized, such as the development and use of underground spaces such as tunnels and subways. In such scenarios, the space is often limited. The pile driver needs to be disassembled and transported to the site and then assembled for use. This method solves the problem of equipment transportation. However, in the actual construction process, the underground space is really limited, and the drill pipe can only be divided into shorter segments to be put into use, which requires frequent disassembly and assembly, which undoubtedly increases the construction duration and construction difficulty. Moreover, most of the connections of the new drill pipes in the existing technology are realized by hoisting. This requires a crane to first lift the drill pipe high and then insert it into the power head of the pile driver to achieve installation and docking. In order to meet the requirements of hoisting and docking, the length of the drill pipe is further restricted. And the space required by the crane is larger than that of the pile driver, which makes the height space of the pile driver unable to be utilized with the highest efficiency, greatly restricting the actual construction efficiency and quality.

[0004] Based on this, the present invention designs a micro-pressure grouting reinforcement method and a grouting system to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a micro-pressure grouting reinforcement method and a grouting system to solve the problems mentioned in the above background technique, that is, the underground space is really limited, and the drill pipe can only be divided into shorter segments to be put into use, which requires frequent disassembly and assembly, which undoubtedly increases the construction duration and construction difficulty, and greatly restricts the actual construction efficiency and quality.

[0006] To achieve the above object, the present invention provides the following technical solution: a micro-pressure grouting reinforcement system, including a pile driver and a power frame. The power frame includes a mounting frame and a support frame. The support frame is rotatably installed inside the mounting frame. A group of grouting arms are slidably connected inside the support frame. Fixed chucks and power heads are installed inside the grouting arms and slidably connected respectively.

[0007] The power head includes an outer frame and an inner frame. A telescopic cylinder is installed between the outer frame and the inner frame. Roller frames are fixedly connected to the top and bottom of the outside of the inner frame. A grouting roller is rotatably installed between the roller frames. A reversing frame is fixedly connected to the inside of the outer frame. A reversing gear is rotatably connected in the middle of the reversing frame. Clamping blocks are slidably connected to the top and bottom inside the outer frame. The clamping blocks are located on both sides of the roller frames. Reversing racks are fixedly connected to the opposite sides of the clamping blocks and the roller frames. The reversing gear is located between the clamping blocks and the roller frames and meshes with the reversing racks of both at the same time. A filling cavity is opened inside the outer frame. An upper pressing piece and a lower pressing piece are slidably connected in the filling cavity. The telescopic cylinder communicates with the filling cavity between the upper pressing piece and the lower pressing piece. Push cylinders are fixedly installed between the upper pressing piece and the lower pressing piece and the filling cavity respectively.

[0008] The fixed chuck is fixedly connected to the grouting arm through an adjusting cylinder. The fixed chuck includes a transverse member and lateral members. The lateral members are rotatably connected to both ends of the transverse member through top shafts. A middle rack is slidably connected to the top of the transverse member. Rotating gears are fixedly connected to the tops of the top shafts. The middle rack is located between the rotating gears and is used to drive the lateral members to rotate.

[0009] As a further solution of the present invention, two groups of support frames are provided and distributed at both ends of the grouting arm. A clamping slideway is opened inside the support frame. A clamping lead screw is rotatably installed in the clamping slideway. A moving block is fixedly connected to the side wall of the grouting arm. The moving block is located in the clamping slideway and the clamping lead screw passes through the moving block and is in threaded cooperation with it. A telescopic guide cylinder is connected between the grouting arm and the support frame.

[0010] As a further solution of the present invention, power push cylinders and guide rods are installed inside the support frames. Power blocks are fixedly connected to the outside of the power heads. The power blocks are slidably matched with the support frames. The power push cylinders are used to drive the power blocks to move. The guide rods pass through the power blocks and are in sliding cooperation with them.

[0011] As a further solution of the present invention, inner rods are fixedly connected to the rear ends of the roller frames and the clamping blocks. Holding sleeves are sleeved outside the inner rods. The rear end of the holding sleeve of the clamping block at the upper end is communicated with the holding sleeve of the roller frame at the lower end through an oil pipe. The rear end of the holding sleeve of the roller frame at the upper end is also communicated with the holding sleeve of the clamping block at the lower end through an oil pipe. Opening and closing valves are installed in the middle of the oil pipes.

[0012] As a further solution of the present invention, driving gears are fixedly connected to both the upper and lower ends of the roller shaft of the grouting roller. A double-headed gear is installed in the middle of the inner frame. The wheel body of the double-headed gear meshes with the driving gears. A driving motor is installed in the middle of the inner frame, and the driving motor is used to drive the double-headed gear to rotate.

[0013] As a further solution of the present invention, a holding cross bar is provided in the middle of the transverse member. Lateral holding rods are rotatably connected to both ends of the holding cross bar. A receiving groove is provided in the middle of the lateral member. Pulling grooves are provided at both the bottom end and the top end of the receiving groove. The lateral holding rods are slidably matched with the pulling grooves through sliding shafts fixedly connected to their ends. Holding balls are rotatably installed on the sides of both the lateral holding rods and the holding cross bar. A switching push cylinder is fixedly installed between the transverse member and the holding cross bar. The rotation connection between the holding cross bar and the lateral holding rods is coaxial with the rotation connection between the transverse member and the lateral member in the original state.

[0014] As a further solution of the present invention, a set of extension gears are rotatably connected to the top of the transverse member. The extension gears are located between the rotating gears and respectively mesh with the adjacent rotating gears. The middle rack is located between the extension gears and meshes with the extension gears on both sides. The middle rack is driven by a rack push cylinder installed on the top of the transverse member.

[0015] As a further solution of the present invention, it further includes a driving frame rotatably connected to the inner side of the support frame. The driving frame is L-shaped. The inner sides of the driving frames are fixedly connected to a pipe changing frame through support cylinders. A central frame is fixedly connected to the inner side of the pipe changing frame. The central frame is used to drive the pipe changing frame to move and clamp the grouting pipe through the support cylinders.

[0016] As a further solution of the present invention, adjustment sliding grooves are provided in the middle of the central frames. A positioning rod is slidably connected through the adjustment sliding grooves in common. Two positioning blocks are slidably connected in the positioning rod. An adjustment lead screw is rotatably installed in the adjustment sliding grooves. The adjustment lead screw passes through the positioning blocks and is in threaded cooperation with them.

[0017] A micro-pressure grouting reinforcement method includes the following steps:

[0018] Transport the pile driver and the power frame to the site, rotate the grouting arm to the vertical state, and first install an orifice sealing device at the construction position;

[0019] Install a drill pipe between the power heads of the grouting arm, clamp the drill pipe at the bottom through a fixed chuck, and drive the power heads to move through the grouting arm, thereby driving the drill pipe to drill through the orifice sealing device;

[0020] After the first drill pipe is drilled to an appropriate depth, the grouting arm is driven to separate, causing the power head to separate. The adjustment cylinders extend simultaneously to keep the fixed chuck in a clamped state. The new drill pipe is clamped by the center frame, and then the driving frame is rotated to a vertical state. The new drill pipe is sent between the grouting arms in a vertical state, located between the power heads and above the fixed chuck, and connected to the drilled drill pipe.

[0021] The new drill pipe is fixedly connected to the lower drilled drill pipe. The grouting arm is closed again, and at the same time, the adjustment cylinders contract accordingly. The power head re-clamps the new drill pipe and drills down again through the power head.

[0022] Repeat until the drilling reaches the designed depth. Then, connect the grouting system, push the inner frame forward and retract the clamping block so that the grouting roller clamps the drill pipe. Then, through the lifting of the power head and the rotation of the grouting roller, rotational spraying and lifting are achieved.

[0023] During the spraying and lifting process, the lower rod can be clamped by the center frame until the grouting is completed. Then, the hole mouth sealing device is removed and the hole is sealed.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The overall device can make the most of the relatively limited space height, maximize the length of each drill pipe, thereby avoiding frequent rod connection, reducing the number of joints, maximizing the effective stroke of the power head, improving the construction efficiency and quality, and at the same time adapting to various diameter rod bodies to meet various construction requirements, being relatively flexible.

[0026] The grouting roller can rotate reciprocally or circumferentially, thereby driving the grouting pipe to achieve swing grouting or circumferential grouting, so as to realize various grouting shapes and form pile foundations with different structures.

[0027] The grouting pipe or the drill pipe can smoothly move while being clamped and held by the cross bar and the lateral holding rod, thereby providing a holding and guiding function, which is beneficial to controlling the drilling direction of the drill pipe; it becomes the cross member and the lateral member to clamp the drill pipe, providing a stable and firm clamping, facilitating the docking and disassembly of the rod members. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic side view of the overall structure of the present invention;

[0029] Figure 2 It is a schematic front clamping drilling view of the overall structure of the present invention;

[0030] Figure 3 It is a schematic front view of the power frame of the present invention when the upper rod is open;

[0031] Figure 4 It is a schematic side view of the power frame of the present invention before the upper rod is inserted;

[0032] Figure 5 Schematic structural diagram of the front side view of the power rack of the present invention;

[0033] Figure 6 Schematic structural diagram of the rear side view of the power rack of the present invention;

[0034] Figure 7 Schematic structural diagram of the middle half-section of the power rack of the present invention;

[0035] Figure 8 Schematic structural diagram of the front half-section top view of the power head in the middle half-section of the power rack of the present invention;

[0036] Figure 9 Schematic structural diagram of the front side view stepped section of the fixed chuck of the present invention;

[0037] Figure 10 Schematic structural diagram of the corner section at the power head of the power rack of the present invention;

[0038] Figure 11 For the present invention Figure 10 Schematic enlarged structural diagram of part A in the middle;

[0039] Figure 12 Schematic structural diagram of the rear side view of the internal structure of the power head of the present invention;

[0040] Figure 13 Schematic structural diagram of the front side view of the internal structure of the power head of the present invention;

[0041] Figure 14 Schematic structural diagram of the top view half-section of the internal structure of the power head of the present invention.

[0042] In the drawings, the list of components represented by each reference numeral is as follows:

[0043] 1. Pile driver; 2. Installation frame; 3. Support frame; 4. Grouting arm; 5. Fixed chuck; 6. Power head; 7. Outer frame; 8. Inner frame; 9. Telescopic cylinder; 10. Roller frame; 11. Grouting roller; 12. Reversing frame; 13. Reversing gear; 14. Clamping block; 15. Reversing rack; 16. Filling cavity; 17. Upper pressing piece; 18. Lower pressing piece; 19. Pushing cylinder; 20. Transverse member; 21. Lateral member; 22. Middle rack; 23. Rotating gear; 24. Clamping slideway; 25. Clamping lead screw; 26. Moving block; 27. Telescopic guide cylinder; 28. Power pushing cylinder; 29. Guide rod; 30. Power block; 31. Inner rod; 32. Holding sleeve; 33. Oil pipe; 34. Opening and closing valve; 35. Driving gear; 36. Double-headed gear; 37. Driving motor; 38. Holding cross bar; 39. Lateral holding rod; 40. Accommodating groove; 41. Pulling groove; 42. Slide shaft; 43. Holding ball; 44. Switching pushing cylinder; 45. Extension gear; 46. Rack pushing cylinder; 47. Driving frame; 48. Support cylinder; 49. Pipe changing frame; 50. Center frame; 51. Adjusting slide groove; 52. Positioning rod; 53. Positioning block; 54. Adjusting lead screw; 55. Adjusting cylinder. Detailed implementation mode

[0044] Please refer to Figures 1-14 , the technical solution provided by the present invention is as follows:

[0045] A micro-pressure grouting reinforcement system includes a pile driver 1 and a power frame. The power frame includes an installation frame 2 and a support frame 3. The support frame 3 is rotatably installed inside the installation frame 2. A group of grouting arms 4 are slidably connected inside the support frame 3. Fixed chucks 5 are installed on the inner sides of the grouting arms 4, and power heads 6 are slidably connected thereto;

[0046] The power head 6 includes an outer frame 7 and an inner frame 8. A telescopic cylinder 9 is installed between the outer frame 7 and the inner frame 8. Roller frames 10 are fixedly connected to the top and bottom of the outer side of the inner frame 8. A grouting roller 11 is rotatably installed between the roller frames 10. A reversing frame 12 is fixedly connected to the inner side of the outer frame 7. A reversing gear 13 is rotatably connected in the middle of the reversing frame 12. Clamping blocks 14 are slidably connected to the inner top and inner bottom of the outer frame 7. The clamping blocks 14 are located on both sides of the roller frame 10. Reversing racks 15 are fixedly connected to the opposite sides of the clamping blocks 14 and the roller frame 10. The reversing gear 13 is located between the clamping blocks 14 and the roller frame 10 and meshes with the reversing racks 15 of both at the same time. A filling cavity 16 is formed inside the outer frame 7. An upper pressing piece 17 and a lower pressing piece 18 are slidably connected in the filling cavity 16. The telescopic cylinder 9 is communicated with the filling cavity 16 between the upper pressing piece 17 and the lower pressing piece 18. Pushing cylinders 19 are fixedly installed between the upper pressing piece 17 and the lower pressing piece 18 and the filling cavity 16;

[0047] The fixed chuck 5 is fixedly connected to the grouting arm 4 through the adjusting cylinder 55. The fixed chuck 5 includes a transverse member 20 and lateral members 21. The lateral members 21 are rotatably connected to both ends of the transverse member 20 through top shafts. A middle rack 22 is slidably connected to the top of the transverse member 20. Rotating gears 23 are fixedly connected to the tops of the top shafts. The middle rack 22 is located between the rotating gears 23 for driving the lateral members 21 to rotate.

[0048] The specific principle is as follows:

[0049] Please refer to Figures 1-6 , first install the orifice sealing device at the construction position, and transport the pile driver 1 and the power frame to the site. The pile driver 1 and the power frame can be two separate parts, which is convenient for transportation, and the power frame can be set on the ground to avoid occupying the upper space. After connecting the pile driver 1 and the power frame, rotate the grouting arm 4 to the vertical state through the motor inside the mounting frame 2 or through the hydraulic struts provided between the mounting frame 2 and the support frame 3, so that the fixed chuck 5 is located above the orifice sealing device. Then install the drill pipe between the power heads 6 of the grouting arm 4, drive the moving block 26 to move through the clamping lead screw 25, drive the grouting arm 4 and the power head 6 and the fixed chuck 5 inside it to move closer to the middle at the same time, and then clamp the drill pipe through the combination of the power heads 6. At the bottom, the fixed chuck 5 moves towards the middle to clamp the drill pipe by the elongation of the adjusting cylinder 55, and drive the power head 6 to move through the power push cylinder 28 inside the grouting arm 4, and then drive the drill pipe to drill through the orifice sealing device;

[0050] When the first drill pipe is drilled to the appropriate depth, drive the grouting arm 4 to separate so that the power heads 6 separate, and the adjusting cylinder 55 elongates at the same time so that the fixed chuck 5 remains in the clamping state. Clamp the new drill pipe through the center frame 50 when the driving frame 47 is in the horizontal state, and then rotate the driving frame 47 to the vertical state, send the new drill pipe to between the grouting arms 4 in the vertical state, and be located between the power heads 6 and above the fixed chuck 5 and connect with the drilled drill pipe;

[0051] This method of loading the drill pipe can make the length of each section of the drill pipe the longest, fully utilize the underground space, the new drill pipe is loaded from the side, and there is no need to specifically move the power head 6 to the lowest position, and the height of the power head 6 does not affect the length of the drill pipe, greatly improving the effective stroke of the power head 6, reducing the number of joints and the docking frequency, and at the same time improving the construction efficiency and quality; it can also be applicable to drill pipes of different diameters to meet the construction requirements of various environments.

[0052] Fix the new drill pipe and the drilled drill pipe below together, close the grouting arm 4 again, and at the same time the adjusting cylinder 55 follows and contracts. The fixed chuck 5 always remains in the clamping state during this period, which is convenient for the docking of the upper and lower drill pipes. The power head 6 re-clamps the new drill pipe and drills again through the power head 6;

[0053] Repeat the connecting rod until the drill reaches the designed depth. Then connect the grouting system, push the inner frame 8 forward and retract the clamping block 14 so that the grouting roller 11 clamps the drill pipe. Then, through the lifting of the power head 6 and the rotation of the grouting roller 11, the rotation and grouting lifting are realized. This method can achieve 360-degree grouting or swinging grouting at a certain angle, with a high degree of freedom and can complete pile foundations of various shapes;

[0054] During the grouting and lifting process, the rod body can be removed by clamping with the center frame 50 until the grouting is completed. Then, remove the hole sealing device at the orifice and seal the hole.

[0055] The overall device can make the best use of the relatively limited space height, maximize the length of each drill pipe, thereby avoiding frequent rod connection, reducing the number of joints, maximizing the effective stroke of the power head 6, improving the construction efficiency and quality. At the same time, it is adaptable to rod bodies of various diameters, meets various construction requirements, and is relatively flexible.

[0056] The opening and closing of the grouting arm 4 can drive the moving block 26 to move by rotating the clamping lead screw 25, thereby driving the grouting arm 4 to move, realizing the opening to both sides or the closing to the middle, and then driving the power head 6 to open and clamp. At the same time, the telescopic guide cylinder 27 follows to extend or shorten to strengthen the connection between the support frame 3 and the grouting arm 4; the up and down movement of the power head 6 is realized by means of the power push cylinder 28 or the lead screw. Then, on the premise that the power head 6 clamps the drill pipe, drilling or extraction can be realized.

[0057] The specific clamping process and principle of the power head 6:

[0058] Please refer to Figures 7-8 、 Figures 10-14 During the drilling process, the drill pipe is clamped by the clamping block 14, and the clamping is relatively stable and firm. During the drilling process, the lower fixed chuck 5 clamps the drill pipe by keeping the holding balls 43 inside the holding cross bar 38 and the lateral holding rod 39. At this time, the drill pipe can slide down under the holding of the holding cross bar 38 and the lateral holding rod 39, playing a role of guiding and supporting during the drilling process;

[0059] During the lifting grouting process, the front push of the telescopic cylinder 9 drives the inner frame 8 to move forward, so that the roller frame 10 together with the grouting roller 11 is pushed forward to clamp the drill pipe. At the same time, under the cooperation of the reversing rack 15 and the reversing gear 13, the clamping block 14 retracts; the rotation of the double-headed gear 36 is driven by the driving motor 37, and then the grouting roller 11 is driven to rotate through the meshing with the driving gear 35. All the driving motors 37 are connected and rotate in the same direction, and then drive the grouting pipes clamped therebetween to rotate, realizing the grouting method of rotating while lifting. The driving method of the driving motor 37 can make the grouting roller 11 rotate reciprocally or circumferentially, and then drive the grouting pipe to realize swinging grouting or circumferential grouting, so as to realize various grouting shapes and form pile foundations with different structures; the driving motor 37 can be a hydraulic motor, and then all the hydraulic motors can be uniformly controlled through a unified hydraulic pipeline, improving the synchronism and durability.

[0060] Please refer to Figures 10-11 、 Figure 13 Taking the front push of the telescopic cylinder 9 to move the inner frame 8 and make the roller frame 10 move towards the middle as an example, when the telescopic cylinder 9 pushes forward, all the opening and closing valves 34 are opened. When the roller frame 10 moves towards the center of the outer frame 7, the inner rod 31 at its rear moves forward, and the space between the holding sleeve 32 at its rear and the inner rod 31 becomes larger. Under the cooperation of the reversing rack 15 and the reversing gear 13, the clamping block 14 retracts, and the inner rod 31 at the rear of the clamping block 14 moves backward, and the space between the holding sleeve 32 at its rear and the inner rod 31 becomes smaller. Then, the hydraulic oil in the holding sleeve 32 behind the clamping block 14 connected by the oil pipe 33 enters the holding sleeve 32 behind the roller frame 10; when the telescopic cylinder 9 pushes the roller frame 10 until the grouting roller 11 clamps the grouting pipe, the telescopic cylinder 9 stops moving, and at the same time all the opening and closing valves 34 are closed. The amount of hydraulic oil in the holding sleeves 32 behind the roller frame 10 and the clamping block 14 cannot be changed, so the position of the holding sleeve 32 relative to the inner rod 31 is maintained, thus fixing the positions of the roller frame 10 and the clamping block 14. When the clamping block 14 extends forward to clamp, the force on the reversing gear 13 and the reversing rack 15 is avoided to maintain the positions of the roller frame 10 and the clamping block 14, so that the reversing gear 13 is only used as a transmission part rather than a stressed part, thus protecting the reversing gear 13 and making the relative positions of the roller frame 10 and the clamping block 14 relatively stable, and the clamping is more firm.

[0061] The pushing cylinder 19 drives the upper pressing piece 17 and the lower pressing piece 18 to move towards the middle together, and then the hydraulic oil in the filling cavity 16 is sent into the telescopic cylinder 9 together, so that all the telescopic cylinders 9 extend forward at the same time; the start is more synchronous and convenient to control.

[0062] The telescopic cylinder 9 drives the inner frame 8 to extend forward so that the grouting roller 11 clamps the grouting pipe. The telescopic cylinder 9 drives the inner frame 8 to retract, so that the clamping block 14 extends forward to clamp the drill pipe. During this process, the positions of the clamping block 14 and the grouting roller 11 are adjustable. Therefore, drill pipes or grouting pipes with different diameters can be clamped to meet different construction requirements.

[0063] The grouting arms 4 and the power head 6 are arranged in half, which can avoid the hoisting method for the drill pipe or grouting pipe. The limited space can be utilized to the greatest extent, and at the same time, the height of the power head 6 is reduced, so that the power head 6 has a longer effective stroke.

[0064] The specific use and principle of the fixed chuck 5

[0065] Please refer to Figures 7-9 , during the drilling or lifting process, the drill pipe or grouting pipe is clamped by maintaining the holding balls 43 on the sides of the cross bar 38 and the lateral holding rod 39. At this time, the grouting pipe or drill pipe can smoothly move under the clamping and holding of the cross bar 38 and the lateral holding rod 39, so as to provide a holding and guiding function, which is conducive to controlling the drilling direction of the drill pipe, etc.;

[0066] During the rod changing process, the push cylinder 44 is switched to pull the cross bar 38 to retract, and then the lateral holding rod 39 is pulled to move backward. The front end of the lateral holding rod 39 slides backward along the pulling groove 41 to be inclined, so that the cross bar 38 and the lateral holding rod 39 leave the surface of the drill pipe. At this time, the transverse member 20 and the lateral member 21 clamp the drill pipe, providing a stable and firm clamping, which is convenient for the docking and disassembly of the rods.

[0067] During clamping, the adjusting cylinder 55 drives the transverse member 20 to press against the drill pipe. The rack push cylinder 46 drives the middle rack 22 to move, and then drives the gears on both sides to rotate, so as to drive the lateral member 21 to rotate and clamp the drill pipe, realizing the clamping of drill pipes with different diameters. During this process, the rotation joints of the cross bar 38 and the lateral holding rod 39 are coaxial with the rotation joints of the transverse member 20 and the lateral member 21, and the two sets of components open or contract together.

[0068] By extending the gear 45, it can cooperate with the middle rack 22 to move earlier, so that the front end of the middle rack 22 has a larger movement space, which is convenient for controlling the expansion and contraction of the lateral member 21 to a greater extent and avoiding the middle rack 22 moving forward and hitting the drill pipe.

[0069] The specific use and principle of the drive frame 47

[0070] Please refer to Figures 1-4, in its original state, the driving frame 47 is horizontally stored in the mounting frame 2. When a new drill pipe is needed, the grouting arm 4 is moved to both sides to separate the power heads 6, and the new drill pipe is placed between the center frames 50. The bottom of the new drill pipe is positioned properly so that after the new drill pipe rotates and stands up, it can be connected to the previous drill pipe. Then, the support cylinder 48 drives the pipe changing frame 49 to move, so that the center frame 50 clamps the drill pipe. Then, the driving frame 47 is rotated and erected, driving the pipe changing frame 49 to rotate and stand up. At this time, the drill pipe clamped by the center frame 50 is just located in the middle of the two power heads 6 on both sides. At this time, closing the grouting arm 4 can clamp the new drill pipe through the power heads 6, and then the center frame 50 is released, and the driving frame 47 is rotated and laid down, thus realizing the feeding and docking of the new drill pipe. The side automatic feeding requires no upper space, so the requirement for the length of the drill pipe is relatively small, enabling the drill pipe to be as long as possible, thereby avoiding more joints and pipe changing frequencies.

[0071] The driving frame 47 is rotatably connected to the inner side of the support frame 3 or the inner side of the mounting frame 2. The driving frame 47 and the pipe changing frame 49 are separately arranged to avoid affecting the fixed chuck 5 when the driving frame 47 lies flat.

[0072] For drill pipes of different diameters, the position of the positioning rod 52 can be adjusted by adjusting the lead screw 54, so that when clamping drill pipes of different diameters, the center of the end of the center frame 50 can be clamped at the center position of the drill pipe, thus facilitating the docking of the drill pipes. For example, for a larger diameter, the positioning rod 52 is adjusted closer to the pipe changing frame 49, and for a smaller diameter, it is adjusted farther away.

Claims

1. A micro-pressure grouting reinforcement system, comprising a pile driver (1) and a power frame, characterized in that: The power frame comprises a mounting frame (2) and a support frame (3), wherein the support frame (3) is rotatably mounted on the inner side of the mounting frame (2), a group of grouting arms (4) are slidably connected inside the support frame (3), and a fixed chuck (5) and a power head (6) are slidably connected inside each of the grouting arms (4); The power head (6) comprises an outer frame (7) and an inner frame (8), a telescopic cylinder (9) is installed between the outer frame (7) and the inner frame (8), the outer top and bottom ends of the inner frame (8) are fixedly connected to roller frames (10), a grouting roller (11) is rotatably installed between the roller frames (10), a reversing frame (12) is fixedly connected to the inner side of the outer frame (7), a reversing gear (13) is rotatably connected in the middle of the reversing frame (12), a clamping block (14) is slidably connected to the inner top and bottom of the outer frame (7), the clamping block (14) is located on both sides of the roller frame (10), and the clamping block (14) The outer frame (7) has a reversing rack (15) fixedly connected to one side of the clamping block (14) and the roller frame (10), the reversing gear (13) is located between the clamping block (14) and the roller frame (10) and meshes with the reversing racks (15) of the two at the same time, a filling cavity (16) is provided inside the outer frame (7), an upper pressing plate (17) and a lower pressing plate (18) are slidably connected inside the filling cavity (16), the telescopic cylinder (9) is connected to the filling cavity (16) between the upper pressing plate (17) and the lower pressing plate (18), and a pushing cylinder (19) is fixedly installed between the upper pressing plate (17) and the lower pressing plate (18) and the filling cavity (16); The fixed chuck (5) is fixedly connected to the grouting arm (4) via an adjustment cylinder (55), and the fixed chuck (5) comprises a transverse member (20) and a lateral member (21), the lateral members (21) being rotatably connected to both ends of the transverse member (20) via a top shaft, a middle rack (22) being slidably connected to the top of the transverse member (20), a rotating gear (23) being fixedly connected to the top of the top shaft, and the middle rack (22) being located between the rotating gears (23) and used to drive the lateral members (21) to rotate.

2. A micro-pressure grouting reinforcement system according to claim 1, characterized in that: The support frame (3) is provided with two groups distributed at both ends of the grouting arm (4); a clamping slideway (24) is provided inside the support frame (3); a clamping screw (25) is rotatably installed inside the clamping slideway (24); a moving block (26) is fixedly connected to the side wall of the grouting arm (4); the moving block (26) is located in the clamping slideway (24) and the clamping screw (25) passes through the moving block (26) and is threadedly engaged with the moving block (26); a telescopic guide cylinder (27) is connected between the grouting arm (4) and the support frame (3).

3. A micro-pressure grouting reinforcement system according to claim 1, characterized in that: A power push cylinder (28) and a guide rod (29) are installed on the inner side of the support frame (3), and a power block (30) is fixedly connected to the outer side of the power head (6). The power block (30) is slidably matched with the support frame (3). The power push cylinder (28) is used to drive the power block (30) to move, and the guide rod (29) passes through the power block (30) and is slidably matched with it.

4. A micro-pressure grouting reinforcement system according to claim 1, characterized in that: The roller frame (10) and the clamping block (14) are both fixedly connected to the rear ends of an inner rod (31), and a retaining sleeve (32) is sleeved on the outer side of the inner rod (31). The rear end of the retaining sleeve (32) of the clamping block (14) at the upper end is connected to the retaining sleeve (32) of the roller frame (10) at the lower end through an oil pipe (33), and the rear end of the retaining sleeve (32) of the roller frame (10) at the upper end is also connected to the retaining sleeve (32) of the clamping block (14) at the lower end through an oil pipe (33). An opening and closing valve (34) is installed in the middle of the oil pipe (33).

5. The micro-pressure grouting reinforcement system according to claim 1 is characterized in that: The upper and lower ends of the roller shaft of the grouting roller (11) are fixedly connected to a driving gear (35); a double-headed gear (36) is installed in the middle of the internal frame (8); the wheel body of the double-headed gear (36) is meshed with the driving gear (35); a driving motor (37) is installed in the middle of the internal frame (8); and the driving motor (37) is used to drive the double-headed gear (36) to rotate.

6. A micro-pressure grouting reinforcement system according to claim 1, characterized in that: A retaining cross bar (38) is provided in the middle of the transverse member (20), and lateral retaining rods (39) are rotatably connected at both ends of the retaining cross bar (38). A receiving groove (40) is provided in the middle of the lateral member (21), and a pulling groove (41) is provided at the bottom and top of the receiving groove (40). The lateral retaining rod (39) is slidably matched with the pulling groove (41) via a sliding shaft (42) fixedly connected at the end. Retaining balls (43) are rotatably installed on the sides of the lateral retaining rod (39) and the retaining cross bar (38). A switching push cylinder (44) is fixedly installed between the transverse member (20) and the retaining cross bar (38), and the rotational connection between the retaining cross bar (38) and the lateral retaining rod (39) is coaxial with the rotational connection between the transverse member (20) and the lateral member (21) in the original state.

7. The micro-pressure grouting reinforcement system according to claim 1 is characterized in that: A group of extended gears (45) are rotatably connected to the top of the transverse member (20). The extended gears (45) are located between the rotating gears (23) and mesh with the rotating gears (23) adjacent thereto respectively. The middle rack (22) is located between the extended gears (45) and meshes with the extended gears (45) on both sides. The middle rack (22) is driven by a rack push cylinder (46) installed on the top of the transverse member (20).

8. The micro-pressure grouting reinforcement system according to claim 1 is characterized in that: It also includes a driving frame (47) rotatably connected to the inner side of the support frame (3), the driving frame (47) being L-shaped, the inner side of the driving frame (47) being fixedly connected to a pipe changing frame (49) via a supporting cylinder (48), the inner side of the pipe changing frame (49) being fixedly connected to a center frame (50), the center frame (50) being used to drive the pipe changing frame (49) to move and clamp the grouting pipe via the supporting cylinder (48).

9. A micro-pressure grouting reinforcement system according to claim 8, characterized in that: An adjustment slot (51) is provided in the middle of the center frame (50), a positioning rod (52) is slidably connected to the adjustment slot (51), two positioning blocks (53) are slidably connected to the positioning rod (52), an adjustment screw (54) is rotatably installed in the adjustment slot (51), and the adjustment screw (54) passes through the positioning block (53) and is threadedly engaged with the positioning block.

10. A micro-pressure grouting reinforcement method, comprising the grouting reinforcement system according to any one of claims 1 to 9, characterized in that The following steps are involved: S1: transporting the pile driver (1) and the power frame to the site, rotating the grouting arm (4) to a vertical state, and installing a hole sealing device at the construction location; S2: A drill rod is installed between the power head (6) of the grouting arm (4), the drill rod is clamped at the bottom by a fixed chuck (5), and the power head (6) is driven to move by the grouting arm (4), thereby driving the drill rod to pass through the hole sealing device and drill down; S3: When the first drill rod is drilled to a suitable depth, the grouting arms (4) are driven to separate so that the power head (6) is separated, and the adjustment cylinder (55) is extended at the same time so that the fixed chuck (5) remains in a clamped state, and a new drill rod is clamped by the center frame (50), and then the driving frame (47) is rotated to a vertical state, and the new drill rod is sent between the grouting arms (4) in a vertical state, and is located between the power head (6) and above the fixed chuck (5) to connect with the drilled drill rod; S4: The new drill rod is fixedly connected to the drill rod drilled below, the grouting arm (4) is closed again, and the adjustment cylinder (55) is contracted accordingly, the power head (6) re-clamps the new drill rod, and the drilling is started again through the power head (6); S5: Repeat S3-S4 until the drill reaches the designed depth, then connect the grouting system, push the internal frame (8) forward and retract the clamping block (14), so that the grouting roller (11) clamps the drill rod, and then realize the rotary grouting lifting by lifting the power head (6) and rotating the grouting roller (11); S6: During the process of grouting lifting, the lower rod can be clamped by the center frame (50) until the grouting is completed, and the hole sealing device is removed and the hole is sealed.

Images