Drilling and injecting integrated and layered grouting repair equipment and method for loose roadbed

Abstract

The application discloses a kind of roadbed loose drilling and injection integrated and layered grouting repair equipment and repair method, belong to road internal disease repair technical field.The equipment includes drilling and injection casing, slurry pumping system and power system;Wherein, drilling and injection casing includes outer tube, gear, several spiral blades, flywheel, inner tube, piston chamber and rack.Drilling and injection casing drops, drill bit contacts and breaks road surface, under the action of spiral blade, outer tube continues to drill to predetermined depth position, without extracting outer tube, rotates gear to drive inner tube outer wall rack vertical movement, so that piston chamber reaches the grouting hole position of disease, can start grouting.The application is combined by outer tube and inner tube, completes the combination of grouting pipe and drill pipe, realizes drilling and injection integrated, avoids the loose soil to scatter to the bottom of grouting hole after drilling is finished due to the pulling out of drill pipe, causes the drawback of hole collapse.

Description

Technical Field

[0001] This invention relates to a drilling and injection integrated and layered grouting repair equipment and method suitable for repairing loose roadbeds, belonging to the field of road internal defect repair technology. Background Technology

[0002] Loose roadbed on highways refers to a situation where the compaction, density, and soil particle content of certain areas of the roadbed are insufficient, ultimately resulting in insufficient local bearing capacity. This can lead to reflective damage such as localized pavement settlement, cracking, and breakage, affecting the driving experience. Under external vibration loads and flowing water, it can also easily form voids of varying sizes, eventually evolving into cavities and other defects. Existing highways that have been in service for many years are prone to this type of damage due to aging drainage facilities and repeated heavy-load compaction.

[0003] Currently, grouting is the most common method for repairing loose roadbeds. Grouting repair has advantages such as speed, avoiding large-scale excavation and filling, minimal impact on traffic, and the ability to effectively address internal roadbed defects, achieving a "comprehensive treatment" effect. However, the process of repairing loose roadbeds using grouting still has technical drawbacks, including the tendency for boreholes to collapse after drilling, making grouting difficult, the risk of grout leakage during the grouting process, and the complexity of layered grouting operations. These drawbacks affect the effectiveness and efficiency of grouting repair. Summary of the Invention

[0004] The purpose of this invention is to overcome the technical problem of "the hole is prone to collapse after drilling during the repair of loose roadbed using grouting repair methods" in the existing technology, and to provide a drilling and grouting integrated and layered grouting repair equipment and repair method suitable for loose roadbed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The equipment for repairing loose roadbeds by drilling and grouting in an integrated manner and by layered grouting is characterized by comprising: a drilling casing, a grout pumping system, and a power system; The drilling casing includes: The outer tube is open at the upper end and sealed at the lower end; the sealed end of the outer tube is a drill bit structure, and the drilling direction of the drill bit structure is along the length direction of the outer tube; grouting holes are opened on the tube wall of the outer tube. Several spiral blades are disposed on the outer surface of the outer tube; A gear is disposed at the open end of the outer tube; The flywheel is fitted onto the outer surface of the outer tube and is statically connected to the outer tube, located between the open end of the outer tube and the uppermost spiral blade. An inner tube, open at both ends, is fitted inside the outer tube, and its length direction is consistent with the length direction of the outer tube; A piston chamber is disposed inside the outer tube, located between the sealing ends of the inner tube and the outer tube; one end of the piston chamber is connected to one end of the inner tube, the other end is sealed, and its side is not sealed; the edges of the two end faces of the piston chamber are sealed to the inner wall of the outer tube; the distance between the two end faces of the piston chamber is greater than or equal to the diameter of the grouting outlet hole. A rack is disposed on the outer surface of the inner tube along the length of the inner tube, located at the other end of the inner tube, and meshes with the gear; The slurry pumping system has its outlet connected to the other end of the inner pipe to deliver slurry to the inner pipe, and the power system drives the flywheel to rotate about the center of the outer pipe along its length.

[0006] According to some embodiments disclosed in this invention, one end of the spiral blade is connected to the outer surface of the outer tube, and the other end is inclined towards the open end of the outer tube. The spiral blade forms an upward angle of less than 90° with the outer surface of the outer tube, which can bring soil out of the road surface during drilling, allowing the outer tube to reach the depth of the roadbed where the defect is located.

[0007] According to some embodiments disclosed in this invention, a plurality of the spiral blades are spirally distributed upward from the sealing end of the outer tube.

[0008] According to some embodiments of the present invention, a check valve is provided on the grouting outlet to prevent grout from flowing into the outer pipe. The check valve can control the grout to flow out only from the piston chamber, preventing the grout from flowing back into the piston chamber; at the same time, it can prevent soil from entering the outer pipe during drilling, causing blockage of the grouting outlet.

[0009] According to some embodiments disclosed in this invention, the piston chamber includes a first piston plate, a second piston plate, and a connecting member; the first piston plate has a through hole at its center, serving as one end face of the piston chamber; the second piston plate serves as the other end face of the piston chamber; the first piston plate and the second piston plate are connected by the connecting member.

[0010] According to some embodiments disclosed in this invention, the power system includes an engine; the lower end of the engine's power transmission rod is movably connected to the flywheel, and the engine drives the flywheel to rotate.

[0011] According to some embodiments disclosed in this invention, the drilling and grouting integrated repair equipment for loose roadbeds further includes a wedge-shaped annular rubber plug; the wedge-shaped annular rubber plug is sleeved on the outer surface of the outer tube, located between the flywheel and the uppermost spiral blade, and can move along the length of the outer tube; the outer diameter of the wedge-shaped annular rubber plug near the opening end of the outer tube is larger than the outer diameter of the other end.

[0012] According to some embodiments disclosed in this invention, the drilling and grouting integrated and layered grouting repair equipment for loose roadbeds also includes a rubber ring; the rubber ring is sleeved on the outer surface of the inner tube, and its outer edge contacts the inner wall of the outer tube.

[0013] According to some embodiments disclosed in this invention, the drilling and grouting integrated repair equipment for loose roadbeds further includes a lifting system, wherein the power system and the drilling and grouting casing are raised and lowered along the lifting system; the lifting system includes a lifting platform, a lifting rod, a rotating rod, and a top platform; the lifting platform and the top platform are provided with vertical threaded through holes in the middle, the rotating rod is provided with threads on its surface, and the rotating rod passes through the threaded through holes of the lifting platform and the top platform sequentially from bottom to top to form a threaded connection; the lifting rod passes through the lifting platform, and its top is statically connected to the top platform.

[0014] According to some embodiments disclosed in this invention, the drilling and grouting integrated and layered grouting repair equipment for loose roadbeds also includes a flatbed trolley; the lifting system is located at the rear of the flatbed trolley, and the grout pumping system is located at the front of the flatbed trolley.

[0015] The method for repairing loose roadbeds, using the aforementioned integrated drilling and grouting equipment, includes the following steps: S1: Locate the location and depth of the lesion, and fix the integrated drilling and grouting repair equipment at the location of the lesion; S2: Start the power system, which drives the drilling casing to begin drilling; when the drilling casing reaches the predetermined depth, shut off the power system. S3: Drive the inner tube to move up and down by rotating the gear, so that the piston chamber reaches the defect position and the side of the piston chamber faces at least one grouting outlet; connect the grout outlet of the grout pumping system to the other end of the inner tube and start grouting; stop grouting when the grouting volume reaches the expected index. S4: Disconnect the grout outlet of the grout pumping system from the other end of the inner pipe, start the power system, and the power system drives the drilling casing to rise; after the drilling casing is completely off the ground, shut off the power system, seal the grouting port, and complete the grouting.

[0016] The beneficial effects of this invention are: A drilling and grouting casing is used, with the outer casing replacing the drill rod to perform the drilling function. After drilling is completed, there is no need to remove the outer casing; grouting can be directly applied to loose areas of the roadbed by adjusting the position of the inner casing fitted inside the outer casing. The combination of the outer and inner casing integrates the grouting pipe and the drill rod, achieving integrated drilling and grouting. This avoids the drawback of loose soil scattering to the bottom of the grouting hole and causing collapse after drilling is completed due to the removal of the drill rod.

[0017] II. In existing technologies, drilling and grouting are performed separately. After inserting the grouting pipe, gaps may exist due to a lack of tight fit between the drilled hole and the grouting pipe. Traditional grouting involves pulling the grouting pipe to perform layered grouting, which can also lead to a lack of tight fit between the drilled hole and the grouting pipe, resulting in grout overflow. This invention solves the problem of needing to move the grouting pipe by integrating drilling and grouting and adjusting the position of the inner pipe for layered grouting. The drilled hole and the grouting pipe fit tightly together, and the gap between the outer pipe and the hole wall is sealed with a wedge-shaped annular rubber plug, thus solving the problem of grout overflow.

[0018] Third, in existing technologies, equipment is scattered and requires manual handling; drilling and grouting are performed separately, making the operation steps cumbersome; all of these factors affect the quality and effectiveness of grouting. This invention integrates grouting equipment onto a flatbed truck, eliminating the need for manual handling; it standardizes the drilling and grouting steps, simplifies the process, improves the efficiency and accuracy of grouting projects, and reduces labor input. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of grouting repair using the integrated drilling and injection and layered grouting repair equipment for loose roadbeds provided in this embodiment of the invention; Figure 2 This is a schematic cross-sectional view of the drilling casing of the integrated drilling and grouting and layered grouting repair equipment for loose roadbeds provided in this embodiment of the invention. Figure 3 This is a schematic diagram illustrating the use of the integrated drilling and grouting and layered grouting repair equipment for loose roadbeds provided in this invention to grout the lower layer of roadbed defects. Figure 4 This is a schematic diagram illustrating the use of the integrated drilling and grouting and layered grouting repair equipment for loose roadbeds provided in this embodiment of the invention for grouting repair of upper layer defects in highway subgrade. Among them, 1. internal thread, 2. rack, 3. gear, 5. positioning bearing, 6. drill bit, 7. flywheel. 8. Rubber ring; 9. Outer tube; 10. Spiral blade; 11. Grouting outlet; 12. Piston chamber; 13. Connecting rod; 14. Inner tube; 15. Wedge-shaped annular rubber plug; 16. Check valve; 17. Belt; 18. Fixing bolt; 19. Rotating handle; 20. Gear chamber; 21. Grouting hose connector; 22. Grouting hose; 23. Rotating rod handle; 24. Top platform; 25. Lifting rod; 26. Lifting platform; 27. Power system; 28. Motor; 32. Grouting pump; 35. Pressure control handle; 37. Grout outlet; 38. Pressure gauge; 39. Flatbed truck; 40. Universal wheel; 41. Wheel fixing device; 42. Handle; 43. Road surface layer; 44. Road base layer; 45. Road subbase layer; 46. Subgrade; 47. Subgrade defect area; 48. Roadbed. Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0022] like Figure 1 As shown, the drilling and grouting integrated repair equipment for loose roadbeds includes a drilling casing, a grout pumping system, and a power system 27.

[0023] like Figure 1 , 2 As shown. The drilling casing includes an outer tube 9, a gear 3, several spiral cutting blades 10, a flywheel 7, an inner tube 14, a piston chamber 12, and a rack 2.

[0024] like Figure 1 , 2 As shown. The outer tube 9 is a tubular structure with one open end and the other sealed. The top of the outer tube 9 is open, and the bottom of the outer tube 9 is a drill bit 6, with the drilling direction of the drill bit 6 pointing downwards along the length of the outer tube 9. The drill bit 6 at the bottom of the outer tube 9 can be a conical drill bit 6; the conical bottom (flat end) of the conical drill bit 6 is connected to the main body of the outer tube 9, and the conical apex (sharp end) of the conical drill bit 6 faces downwards. The drill bit 6 at the bottom of the outer tube 9 can be a solid structure. The dimensions of the outer tube 9 can be determined according to the actual working conditions, and the following dimensions can be adopted: outer diameter approximately 10 cm, inner diameter approximately 8 cm, and length approximately 180 cm.

[0025] like Figure 1 , 2As shown. Several helical blades 10 are provided on the surface of the outer tube 9. One end of each helical blade 10 is statically connected to the outer surface of the outer tube 9, and the other end of each helical blade 10 is inclined towards the open end of the outer tube 9. The connection point between the helical blade 10 and the outer surface of the outer tube 9 has a linear connection point, which is perpendicular to or at an angle to the centerline of the outer tube 9 along its length. The helical blades 10 form an upward angle of less than 90° with the outer surface of the outer tube 9, allowing soil to be carried out of the road surface during drilling, enabling the outer tube 9 to reach the depth of the roadbed where the defect is located. Several helical blades 10 are distributed spirally upwards along the outer surface of the outer tube 9, starting from the tip of the drill bit 6. The thickness of each helical blade 10 can be 0.5 cm.

[0026] like Figure 1 , 2 As shown, several grouting holes 11 are formed on the wall of the outer tube 9. The grouting holes 11 are through holes, connecting the inside and outside of the outer tube 9. The grouting holes 11 are distributed between the gaps of the spiral blades 10. The grouting holes 11 are evenly distributed on the wall of the outer tube 9. Four grouting holes 11 can be provided between the upper and lower layers of spiral blades 10, and the four grouting holes 11 are evenly distributed around the outer tube 9. The diameter of the grouting holes 11 can be 2 cm.

[0027] Grout enters the affected area through grouting outlet 11. To prevent the grout from flowing back into the grouting outlet 11 and to prevent soil from entering the grouting outlet 11, such as... Figure 1 , 2 As shown, a check valve 16 can be installed on the grout outlet 11. The check valve 16 can control the grout to flow out only from the grout outlet 11, preventing the grout from flowing back into the grout outlet 11.

[0028] like Figure 1 , 2 As shown. The flywheel 7 is fitted onto the outer surface of the outer tube 9 and is statically connected to the outer tube 9. The flywheel 7 is located between the open end of the outer tube 9 and the uppermost spiral blade 10. The surface of the flywheel 7 has a groove for mounting the belt 17, and the groove wraps around the outer tube 9. The flywheel 7 on the outer tube 9 is connected to the power system 27 via the belt 17. The power system 27 drives the flywheel 7 to rotate via the belt 17, which in turn drives the outer tube 9 to rotate (rotating around the center of the outer tube 9 along its length), thus realizing the drilling of the outer tube 9.

[0029] like Figure 1 , 2As shown. Gear 3 is located at the open end of the outer tube 9. Specifically, gear 3 can be configured via a transmission rod and gear chamber 20. One end of gear chamber 20 is fitted onto the top of the outer tube 9 and is statically connected to it; the other end of gear chamber 20 (opposite to the first end) has an opening through which the inner tube 14 can pass. The inner diameter of gear chamber 20 is larger than the outer diameter of outer tube 9. The transmission rod passes through the wall of gear chamber 20, one end of which is statically connected to gear 3, and the other end of which is connected to a rotating handle 19 on gear chamber 20. The rotation of the internal gear 3 is controlled by rotating the rotating handle 19.

[0030] To prevent grout from overflowing through the gap between the outer pipe 9 and the soil during drilling and grouting; such as Figure 1 , 2 As shown, a wedge-shaped annular rubber plug 15 can be installed on the outer tube 9. The wedge-shaped annular rubber plug 15 is fitted onto the outer surface of the outer tube 9, located between the flywheel 7 and the uppermost spiral blade 10; the wedge-shaped annular rubber plug 15 can move along the length of the outer tube 9; the outer diameter of the wedge-shaped annular rubber plug 15 near the opening of the outer tube 9 is larger than the outer diameter of the other end. During drilling, the wedge-shaped annular rubber plug 15 descends with the outer tube 9 and inserts into the gap between the borehole wall and the outer tube 9, preventing slurry from overflowing along the gap.

[0031] like Figure 1 , 2 As shown. The inner tube 14 is open at both ends and is fitted inside the outer tube 9. The length direction of the inner tube 14 is consistent with the length direction of the outer tube 9. The inner tube 14 has an upper end and a lower end. Relative to the upper end of the inner tube 14, the lower end of the inner tube 14 is close to the drill bit 6 end of the outer tube 9. An internal thread 1 can be provided on the inner wall of the upper end of the inner tube 14 for threaded connection with the grouting hose 22. The dimensions of the inner tube 14 can be determined according to the actual working conditions. Specifically, the following dimensions can be adopted: outer diameter approximately 7 cm, inner diameter 6 cm, and tube length approximately 200 cm.

[0032] To prevent the inner tube 14, which is installed inside the outer tube 9, from shaking, such as Figure 1 , 2 As shown, a rubber ring 8 can also be added. The rubber ring 8 is sleeved on the outer surface of the inner tube 14, and the outer edge of the rubber ring 8 contacts the inner wall of the outer tube 9. The outer edge of the rubber ring 8 abuts against the inner wall of the outer tube 9. The entire outer edge of the rubber ring 8 contacts the inner wall of the outer tube 9, or the outer edge of the rubber ring 8 has two or more contact points with the inner wall of the outer tube 9.

[0033] like Figure 1 , 2As shown. The rack 2 is disposed at the upper end of the inner tube 14 and on the outer surface of the inner tube 14. The rack 2 is disposed along the length direction of the inner tube 14. The rack 2 meshes with the gear 3 disposed at the open end of the outer tube 9; when the gear 3 rotates, it drives the inner tube 14 to move along the length direction of the inner tube 14 through the meshing rack 2, so as to realize the inner tube 14 entering and exiting the outer tube 9.

[0034] like Figure 1 , 2 As shown. The piston chamber 12 is disposed inside the outer tube 9, located between the lower end of the inner tube 14 and the sealed end of the outer tube 9, and connected to the lower end of the inner tube 14; that is, the piston chamber 12 is disposed between the end of the inner tube 14 near the bottom of the outer tube 9 and the bottom of the outer tube 9. One end of the piston chamber 12 communicates with one end (lower end) of the inner tube 14, the other end of the piston chamber 12 is sealed, and the side of the piston chamber 12 is not sealed. The edges of the two end faces of the piston chamber 12 (the end face communicating with the inner tube 14 and the end face of the sealed end) are sealed with the inner wall of the outer tube 9; the distance between these two end faces of the piston chamber 12 is greater than or equal to the diameter of the grouting outlet hole 11. The outer tube 9 is cut along a direction perpendicular to the center line of its length to form a cross-section; this cross-section is annular. The two end faces of the piston chamber 12 have the same shape and size as the inner ring of this annular cross-section. The distance between these two end faces of the piston chamber 12 can be 20 cm.

[0035] like Figure 1 , 2 As shown. One specific structure of the piston chamber 12 is as follows: The piston chamber 12 includes a first piston plate, a second piston plate, and a connecting member; the first piston plate has a through hole in its center, serving as one end face of the piston chamber 12; the through hole of the first piston plate communicates with the lower end opening of the inner tube 14. The second piston plate serves as the other end face of the piston chamber 12 (the end face of the sealed end). The first piston plate and the second piston plate are connected by a connecting member. The connecting member can be a connecting rod. The area between the first piston plate and the second piston plate forms the side of the piston chamber 12. The distance between the first piston plate and the second piston plate can be approximately 20 cm; the diameter of the first piston plate and the second piston plate can be 8 cm; the thickness of the first piston plate and the second piston plate can be 2 cm; the diameter of the hole in the center of the first piston plate can be 6 cm. The first piston plate and the second piston plate are tightly connected to the inner wall of the outer tube 9 to prevent slurry from overflowing into other parts of the outer tube 9.

[0036] The slurry pumping system's outlet 37 is connected to the upper end of the inner pipe 14, supplying slurry into the inner pipe 14. Specifically, as shown... Figure 1As shown, the grout pumping system may include a motor 28, a grout pump 32, a grout hose 22, a pressure control handle 35, a pressure gauge 38, etc. The motor 28 drives the grout pump 32 to deliver grout. The grout outlet 37 of the grout pump 32 is connected to the grout hose 22, which is threadedly connected to the inner tube 14. A pressure gauge is installed at the lower end of the grout outlet 37 of the grout pump 32, which can monitor the grouting pressure in real time and adjust the pressure via the pressure control handle 35.

[0037] The power system 27 drives the flywheel 7 to rotate around the center of the outer tube 9 along its length. Specifically, as shown... Figure 1 As shown, the power system 27 may include an engine; the lower end of the engine's power transmission rod is movably connected to the flywheel 7, and the engine drives the flywheel 7 to rotate. The lower end of the engine's power transmission rod and the flywheel 7 can be movably connected via a belt 17; the engine drives the power transmission rod to rotate, and the power transmission rod drives the flywheel 7 to rotate via the belt 17, and the flywheel 7 drives the outer tube 9 to rotate; thus realizing the drilling of the outer tube 9.

[0038] During the drilling process of the outer tube 9, the outer tube 9 moves downwards, and the flywheel 7 on the outer tube 9 moves downwards. Correspondingly, the power system 27 should move downwards. The power system 27 can move with the outer tube 9 via a lifting system. Specifically, as shown... Figure 1 As shown, the lifting system includes a lifting platform 26, a lifting rod 25, a rotating rod, and a top platform 24; the lifting platform 26 and the top platform 24 are provided with vertical threaded through holes in the middle, and the rotating rod is provided with threads on its surface. The rotating rod passes through the threaded through holes of the lifting platform 26 and the top platform 24 from bottom to top to form a threaded connection; the lifting rod 25 passes through the lifting platform 26, and its top is statically connected to the top platform 24.

[0039] For ease of transportation and construction, the drilling casing, grout pumping system, and power system 27 can be mounted on a flatbed truck 39; for example... Figure 1 As shown, the lifting system is located at the rear of the flatbed 39, and the slurry pumping system is located at the front of the flatbed 39. Example

[0040] like Figure 1 , 2 As shown. A drilling and grouting integrated and layered grouting repair device for loose roadbeds includes a drilling casing, a grout pumping system, a power system 27, a lifting system, and a flatbed trolley 39. The drilling casing is fixed to the front end of the lifting system, and the power system 27 is fixed to the other side of the lifting system. The drilling casing and the power system 27 are connected by a belt 17. The lifting system is fixed to the rear of the flatbed trolley 39, and the grout pumping system is fixed to the front of the trolley. The flatbed trolley 39 is manually pushed by a handle 42. Its wheels can be omnidirectional casters 40, and the wheels have wheel fixing devices 41 to fix the position of the flatbed trolley 39.

[0041] The drilling casing includes an outer tube 9, an inner tube 14, and a gear chamber 20. The lifting system includes a lifting platform 26, a lifting rod 25, a rotating rod, and a top platform 24.

[0042] The outer tube 9 has an outer diameter of 10 cm and an inner diameter of 8 cm. From bottom to top, it consists of a conical drill bit 6, a spiral blade 10, a wedge-shaped annular rubber plug 15, a flywheel 7, and a positioning bearing 5. The conical drill bit 6 is solid and 10 cm long. The spiral blade 10 is 0.5 cm thick. The spiral blade 10 spirals upwards from the conical drill bit 6 along the outer wall of the outer tube 9 to the wedge-shaped annular rubber plug 15. The wedge-shaped annular rubber plug is 5 cm high and 5 cm wide at the top. The flywheel 7 is 10 cm long and has two belt grooves 17. The positioning bearing 5 is located on both sides of the outer wall of the outer tube 9 and the gear chamber 20. The inner tube 14 has an outer diameter of 7 cm, an inner diameter of 6 cm, and a total length of 180 cm. At the bottom of the inner tube 14 is a piston chamber 12. The piston chamber 12 has two piston plates, each 20 cm apart, with a diameter of 8 cm and a thickness of 2 cm, and two connecting rods 13. The upper piston plate has a 6 cm diameter hole in its center. The two connecting rods 13 connect the upper and lower piston plates, and the piston plates are tightly connected to the inner wall of the outer tube 9. Above the piston chamber 12, between the inner and outer tubes 9, is a rubber ring 8 with an outer diameter of 8 cm, an inner diameter of 7 cm, and a thickness of 1 cm. The top of the inner tube 14 has an internal thread 1, which is threaded to the grouting hose 22. The upper outer wall of the inner tube 14 has a rack 2, which drives the inner tube 14 to slide up and down along the inner wall of the outer tube 9 under the control of a gear 3.

[0043] The gear chamber 20 is fixed to the lifting platform 26 by fixing bolts 18. The lower part is connected to the top of the outer tube 9 by positioning bearing 5. There are two rotating handles 19 on the outside of the gear chamber 20, which control the rotation of the internal double gear 3 through the transmission rod. The double gear 3 meshes tightly with the rack 2 on the outer wall of the inner tube 14, controlling the lifting and lowering of the inner tube 14. Drilling sleeves and power systems 27 are fixed on the left and right sides of the lifting platform 26, respectively. The lifting rod 25 passes through the holes on both sides of the lifting platform 26. The lifting platform 26, the lifting rod 25, and the top platform 24 form a portal structure. The rotating rod has threads on its surface and passes through the threaded hole in the middle of the lifting platform 26.

[0044] The power system 27 includes an engine and a frame that fixes the lifting platform 26. The engine includes a fuel tank, an air filter, a throttle, a choke, a gear control lever, and a power transmission lever. The lower end of the power transmission lever has a flywheel 7 and is connected to the outer tube 9 via a belt 17. The engine is fixed inside the frame.

[0045] The grout pumping system includes a motor 28, a grouting pump 32, a high-pressure tank, a pressure control handle 35, and a pressure gauge. The motor 28 drives the grouting pump 32 to pump grout via a belt 17. The grout outlet 37 is connected to a grouting hose 22, which is ultimately connected to the inner pipe 14. A pressure gauge is located at the lower end of the grout outlet 37, which can monitor the grouting pressure in real time and adjust the pressure via the pressure control handle 35.

[0046] The highway consists of the following layers from top to bottom: surface layer 43, base course 44, subbase course 45, subgrade 46, and roadbed 48; the subgrade loosening defect is present in subgrade 46. Methods for repairing subgrade loosening include... Figure 3 , 4 As shown, the following steps are included when using any of the above-mentioned drilling and grouting integrated and layered grouting repair equipment for loose roadbeds: S1: Locate the location and depth of the defect, and fix the integrated drilling and grouting repair equipment at the defect location. Specifically, use GPR technology to inspect the internal defects of the highway subgrade to determine the location and depth of the defects. Transport the integrated drilling and grouting repair equipment to the site, and use a mobile flatbed truck 39 to align the drilling casing with the road surface above the defect location. Lock the wheel fixing device 41 to secure the position of the truck.

[0047] S2: Start the power system 27, which drives the drilling casing to begin drilling; when the drilling casing reaches the predetermined depth, shut off the power system 27. Specifically, start the power system 27, which drives the flywheel 7 of the outer tube 9 to rotate clockwise via the belt 17, controls the rotating lever handle 23 to lower the lifting platform 26, lowers the drilling casing, the drill bit 6 contacts and breaks the road surface, the outer tube 9 rotates clockwise and lowers, and under the interaction of the spiral blade 10 and the road surface structure, the outer tube 9 continues to drill deeper. Observe the scale on the outer tube 9 of the drilling casing, the wedge-shaped annular rubber plug 15 descends with the outer tube 9, sealing between the hole wall and the outer tube 9, the drilling casing reaches the predetermined depth, and shut off the power system 27.

[0048] S3: The first power system 27 drives the inner tube 14 to move up and down, so that the piston chamber 12 reaches the location of the defect and the side of the piston chamber 12 faces at least one grouting outlet 11; the outlet 37 of the grout pumping system is connected to the other end of the inner tube 14 to start grouting; when the grouting volume reaches the expected target, grouting is stopped. Specifically, when the drilling casing reaches the predetermined depth, the rotating gear 3 rotates the handle 19, which drives the gear 3 in the gear chamber 20 to rotate, and the rack 2 on the outer wall of the inner tube 14 moves vertically. The scale on the outer wall of the inner tube 14 above the gear chamber 20 is observed, so that the piston chamber 12 reaches the grouting hole position of the lower defect. The gear 3 is locked and the rotating handle 19 is rotated. The grouting hose connector 21 and the threaded interface of the inner tube 14 are connected, the grouting pump 32 is started, the pressure gauge 38 is observed, and the grouting pressure is controlled by the pressure control handle 35. Once the grouting volume reaches the expected target, grouting is stopped. The locking mechanism of the rotating handle 19 on gear 3 is released. A check valve 16 at the grout outlet 11 of the outer pipe 9 prevents grout backflow. Rotating handle 19 raises the inner pipe 14, bringing the piston to the grouting hole position for the upper layer of the defect. The grouting pump 32 is then started. The pressure gauge 38 is observed, and the grouting pressure is controlled via the pressure control handle 35. Grouting is stopped once the expected grouting volume is reached.

[0049] S4: Disconnect the grout outlet 37 of the grout pumping system from the other end of the inner pipe 14, start the power system 27, and the power system 27 drives the drilling casing to rise; after the drilling casing is completely off the ground, shut off the power system 27, seal the grouting port, and complete the grouting. Specifically, disconnect the grouting hose 22 from the inner pipe 14, start the power system 27 to drive the flywheel 7 of the outer pipe 9 to rotate counterclockwise via the belt 17, control the rotating rod handle 23 to raise the lifting platform 26, and raise the drilling casing. After the drilling casing is completely off the ground, shut off the power system 27, seal the grouting port, and complete the grouting.

[0050] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A drilling and grouting integrated and layered grouting repair device for loose roadbeds, characterized in that, include: Drilling casing, grout pumping system, power system; The drilling casing includes: The outer tube is open at the upper end and sealed at the lower end; the sealed end of the outer tube is a drill bit structure, and the drilling direction of the drill bit structure is along the length direction of the outer tube; grouting holes are opened on the tube wall of the outer tube. Several spiral blades are disposed on the outer surface of the outer tube; A gear is disposed at the open end of the outer tube; The flywheel is fitted onto the outer surface of the outer tube and is statically connected to the outer tube, located between the open end of the outer tube and the uppermost spiral blade. An inner tube, open at both ends, is fitted inside the outer tube, and its length direction is consistent with the length direction of the outer tube; A piston chamber is disposed inside the outer tube, located between the sealed ends of the inner tube and the outer tube; one end of the piston chamber is connected to one end of the inner tube, the other end is sealed, and its side is not sealed; the edges of the two end faces of the piston chamber are sealed to the inner wall of the outer tube; the distance between the two end faces of the piston chamber is greater than or equal to the diameter of the grouting outlet hole. A rack is disposed on the outer surface of the inner tube along the length of the inner tube, located at the other end of the inner tube, and meshes with the gear; The slurry pumping system has its outlet connected to the other end of the inner pipe to deliver slurry to the inner pipe, and the power system drives the flywheel to rotate about the center of the outer pipe along its length.

2. The integrated drilling and grouting and layered grouting repair equipment for loose roadbeds according to claim 1, characterized in that, The grouting outlet is equipped with a check valve to prevent grout from flowing into the outer pipe.

3. The integrated drilling and grouting and layered grouting repair equipment for loose roadbeds according to claim 1, characterized in that, Several of the spiral blades are spirally distributed upwards from the sealed end of the outer tube.

4. The integrated drilling and grouting and layered grouting repair equipment for loose roadbeds according to claim 1, characterized in that, The piston chamber includes a first piston plate, a second piston plate, and a connector; the first piston plate has a through hole in its center, which serves as one end face of the piston chamber; the second piston plate serves as the other end face of the piston chamber; the first piston plate and the second piston plate are connected by the connector.

5. The integrated drilling and grouting and layered grouting repair equipment for loose roadbeds according to claim 1, characterized in that, The power system includes an engine; the lower end of the engine's power transmission rod is movably connected to the flywheel, and the engine drives the flywheel to rotate.

6. The integrated drilling and grouting and layered grouting repair equipment for loose roadbeds according to claim 1, characterized in that, It also includes a wedge-shaped annular rubber plug; the wedge-shaped annular rubber plug is sleeved on the outer surface of the outer tube, located between the flywheel and the uppermost spiral blade, and can move along the length of the outer tube; the outer diameter of the wedge-shaped annular rubber plug near the opening end of the outer tube is larger than the outer diameter of the other end.

7. The integrated drilling and grouting and layered grouting repair equipment for loose roadbeds according to claim 1, characterized in that, It also includes a rubber ring; the rubber ring is sleeved on the outer surface of the inner tube, and its outer edge contacts the inner wall of the outer tube.

8. The integrated drilling and grouting and layered grouting repair equipment for loose roadbeds according to claim 1, characterized in that, It also includes a lifting system, along which the power system and the drilling casing move up and down; the lifting system includes a lifting platform, a lifting rod, a rotating rod, and a top platform; the lifting platform and the top platform are provided with vertical threaded through holes in the middle, the rotating rod is provided with threads on its surface, and the rotating rod passes through the threaded through holes of the lifting platform and the top platform from bottom to top to form a threaded connection; the lifting rod passes through the lifting platform, and its top is statically connected to the top platform.

9. The integrated drilling and grouting and layered grouting repair equipment for loose roadbeds according to claim 8, characterized in that, It also includes a flatbed cart; the lifting system is located at the rear of the flatbed cart, and the slurry pumping system is located at the front of the flatbed cart.

10. A method for repairing loose roadbed, characterized in that, The method of using the integrated drilling and grouting and layered grouting repair equipment for loose roadbeds as described in any one of claims 1-9 includes the following steps: S1: Locate the location and depth of the lesion, and fix the integrated drilling and grouting repair equipment at the location of the lesion; S2: Start the power system, which drives the drilling casing to begin drilling; when the drilling casing reaches the predetermined depth, shut off the power system. S3: Drive the inner tube to move up and down by rotating the gear, so that the piston chamber reaches the defect position and the side of the piston chamber faces at least one grouting outlet; connect the grout outlet of the grout pumping system to the other end of the inner tube and start grouting; stop grouting when the grouting volume reaches the expected index. S4: Disconnect the grout outlet of the grout pumping system from the other end of the inner pipe, start the power system, and the power system drives the drilling casing to rise; after the drilling casing is completely off the ground, shut off the power system, seal the grouting port, and complete the grouting.

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