Slurry mixing mechanism and complete equipment for grouting and mixing reinforcement of highway subgrade soft soil foundation

Abstract

The present application relates to a kind of slurry mixing mechanism and highway subgrade soft soil foundation grouting stirring reinforcement complete equipment, it is applicable to grouting equipment technical field.The present application provides a kind of slurry mixing mechanism, including mixing cylinder, the central position of mixing cylinder is rotationally arranged with center stirring shaft, the upper end of center stirring shaft is connected with the stirring drive mechanism for driving its rotation;The bottom of center stirring shaft is fixed with helical blade, and the material in cylinder is formed longitudinal convection circulation when helical blade rotates with center stirring shaft;Center stirring shaft is also provided with floating stirring mechanism, floating stirring mechanism revolves synchronously with center stirring shaft, and can produce autorotation in revolution process, and forms shear disturbance to material.The present application adopts longitudinal forced convection+revolving autorotation composite stirring multiple mixing structure, cooperates with jet auxiliary disturbance, and slurry homogenization speed is fast, uniformity is good, can effectively guarantee that soil solidification strength is consistent after grouting, improves reinforcement quality.

Description

Technical Field

[0001] This invention relates to a slurry mixing mechanism and a complete set of equipment for grouting and mixing to reinforce soft soil foundations for highway subgrades. It falls within the technical field of grouting equipment. Background Technology

[0002] In highway subgrade construction and maintenance projects, soft soil foundations are prone to problems such as insufficient soil density, internal voids, and uneven settlement, which directly affect the stability of the subgrade and driving safety. Usually, grouting and mixing reinforcement technology is required for treatment.

[0003] Existing grouting reinforcement equipment and processes generally suffer from the following technical defects: First, the mixing efficiency of the slurry is low and the uniformity is poor: Traditional mixing devices rely solely on the rotation of a fixed mixing plate for mixing. The slurry tends to move synchronously with the mixing plate in a circular motion, making it difficult to form longitudinal convection and shear disturbance. This results in dead zones in the mixing, leading to uneven slurry ratios and inconsistent curing strength, which affects the reinforcement effect.

[0004] Second, drilling and grouting are carried out in separate sections, resulting in low efficiency: existing equipment mostly adopts a separate construction method for drilling and grouting, which requires drilling to be completed first and then transferring the equipment for grouting. This results in a long construction cycle and complicated point alignment, making it difficult to meet the needs of continuous construction along highways.

[0005] Third, the equipment is prone to clogging and has high maintenance costs: the slurry easily adheres to the cylinder wall and pipeline, and is difficult to clean after solidification, which can easily cause clogging of the nozzle and pipeline, affecting continuous construction and increasing equipment failure rate and maintenance costs. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a slurry mixing mechanism and a complete set of equipment for grouting, mixing and reinforcing soft soil foundations of highway subgrade, in view of the above-mentioned problems.

[0007] The technical solution adopted in this invention is: In a first aspect, the present invention provides a slurry mixing mechanism, including a mixing cylinder, wherein a central stirring shaft is rotatably disposed at the center of the mixing cylinder, and a stirring drive mechanism for driving the central stirring shaft to rotate is connected to the upper end of the central stirring shaft. The bottom of the central stirring shaft is fixed with helical blades, which push the material inside the cylinder to form a longitudinal convection circulation when the central stirring shaft rotates. A floating stirring mechanism is also provided on the central stirring shaft. The floating stirring mechanism revolves synchronously with the central stirring shaft and can rotate on its own axis during the revolution, thereby creating shear disturbance to the material.

[0008] Through the above-mentioned technical means, the spiral blades are used to force the material to form vertical convection, breaking the flow state of traditional mixing which only has circular motion and eliminating vertical mixing dead corners. At the same time, the floating mixing mechanism forms multi-level shear disturbance on the slurry with the combined action of revolution and rotation, which enhances the mixing effect from both longitudinal and radial dimensions. This fundamentally solves the problems of uneven mixing and mixing dead corners in traditional mixing devices, significantly improves the uniformity and efficiency of slurry mixing, and ensures consistent slurry ratio and stable curing strength.

[0009] In some embodiments, the floating stirring mechanism includes a drive disk fixedly sleeved on the outside of a central stirring shaft. The drive disk is circumferentially hinged with a plurality of rotating arms, and each rotating arm is rotatably mounted with a driven stirring shaft. Stirring blades are distributed on the outer surface of the driven stirring shaft. The inner wall of the mixing cylinder is provided with a friction transmission component. When the driven stirring shaft revolves with the drive disk, the friction transmission component drives the driven stirring shaft to rotate around its own axis.

[0010] Through the above-mentioned technical means, the drive disc drives multiple sets of driven stirring shafts to revolve in a circular motion, realizing large-scale radial material gathering and mixing inside the cylinder; at the same time, with the help of friction transmission components, without the need for additional drive motors and wiring, the revolution can be used to drive the driven stirring shafts to rotate at high speed, forming a dual stirring effect of revolution material gathering + rotation shearing, which enhances the shearing and crushing effect on the slurry.

[0011] In some embodiments, the friction drive includes a mounting ring fixedly disposed on the inner wall of the mixing cylinder, and a continuous friction surface is provided on the inner side of the mounting ring; a drive wheel is fixedly disposed at the upper end of the driven stirring shaft, and the drive wheel abuts against the friction surface, thereby driving the driven stirring shaft to rotate by friction.

[0012] By using the above-mentioned technical means, the friction surface fixed on the cylinder wall cooperates with the transmission wheel at the end of the driven stirring shaft, and the transmission of rotational force is realized through contact friction. The transmission structure is simple and reliable, and no additional power input is required, so that the rotational driving force can be obtained synchronously during the revolution.

[0013] In some embodiments, the inner side of the mounting ring is further provided with a plurality of protrusions arranged in an array, and the surface of the protrusions is provided with a friction surface that is continuous with the inner side of the mounting ring. An elastic rod assembly is connected between the rotating arm and the drive disc. The elastic rod assembly provides outward elastic support force to the rotating arm, so that the transmission wheel always abuts against the friction surface. As the drive wheel revolves and passes the protrusion, it is radially squeezed by the protrusion, which pushes the rotating arm to swing inward, thus achieving a periodic dynamic change in the stirring radius.

[0014] By employing the aforementioned technical means, the stirring radius of the driven stirring shaft changes dynamically with its revolution, and the stirring trajectory changes continuously. This completely eliminates the annular stirring blind zone formed by fixed-radius stirring, allowing the slurry in all radial areas of the cylinder to be fully disturbed, further improving the mixing uniformity. At the same time, the elastic rod assembly can absorb rigid impacts, ensuring smooth and stable diameter-changing action.

[0015] In some embodiments, the elastic rod assembly includes an elastic sleeve and an elastic slide rod slidably passing through the elastic sleeve, with a spring assembly provided between the elastic slide rod and the inner wall of the elastic sleeve; the end of the elastic sleeve is hinged to the surface of the drive disk, and the end of the elastic slide rod is hinged to the side of the rotating arm.

[0016] In some embodiments, the central stirring shaft is a hollow shaft structure, and multiple stirring racks are arrayed on the lower outer side of the central stirring shaft. The inner cavity of the stirring rack is connected to the inner cavity of the central stirring shaft, and multiple injection holes are distributed on the surface of the stirring rack. The upper end of the central stirring shaft is connected to a water supply mechanism, and pressurized water is sprayed out from the spray hole after passing through the central stirring shaft and the stirring frame.

[0017] Through the above-mentioned technical means, pressurized water is sprayed out from the rotating jet hole during the mixing process, forming multiple high-speed jets that generate hydraulic impact disturbance on the slurry, accelerate the dissolution and dispersion of powder, and help enhance the mixing effect; at the same time, the rotating water column can continuously flush the inner wall of the mixing cylinder, preventing the slurry from adhering and forming a layer. After the construction is completed, the inside of the cylinder and the subsequent conveying pipeline can also be thoroughly cleaned to avoid the slurry solidifying and clogging.

[0018] In some embodiments, the water supply mechanism includes a rotary joint, a water supply pipe, and a water pump. The rotary joint is rotatably connected to the upper end of the central stirring shaft, and the rotary joint is connected to the outlet end of the water pump through the water supply pipe.

[0019] In some embodiments, the stirring drive mechanism includes a stirring motor, a drive gear, and a driven gear. The driven gear is fixedly sleeved on the outside of the central stirring shaft, and the drive gear is fixedly disposed at the output end of the stirring motor. The drive gear and the driven gear mesh with each other.

[0020] In some embodiments, a feeding mechanism is provided on one side of the upper end of the mixing cylinder. The feeding mechanism includes a feeding box, which is fixed to the side wall of the mixing cylinder by a positioning frame. The bottom of the feeding box is connected to the inside of the mixing cylinder through a discharge channel, and a discharge valve is provided in the discharge channel.

[0021] Secondly, the present invention provides a complete set of equipment for grouting and mixing reinforcement of soft soil foundation for highway subgrade, including a vehicle body, on which the grout mixing mechanism is provided, and at the rear of the vehicle body a drilling and grouting assembly is provided. The drilling and grouting assembly includes a drill rod with an internal material conveying channel. A drill bit is provided at the lower end of the drill rod, and a spray hole connected to the material conveying channel is provided on the side wall of the drill rod near the drill bit. The upper end of the drill rod is connected to the bottom outlet of the mixing cylinder through a conveying pipeline. A feeding pump is provided on the conveying pipeline to realize synchronous and continuous drilling and grouting operations.

[0022] By employing the aforementioned technical means, the drilling and grouting functions are integrated into an integrated drill rod structure. Grout injection can be completed simultaneously during the drilling process, merging the traditional separate drilling and grouting processes into a synchronous continuous operation. This eliminates intermediate steps such as first lifting the drill, changing the grouting pipe, and lowering the grouting pipe, significantly shortening the construction cycle at a single point and improving the efficiency of roadbed reinforcement operations.

[0023] In some embodiments, the bottom of the vehicle body is provided with a detection mechanism for detecting the location of underground cavities and loose areas in the roadbed.

[0024] In some embodiments, the detection mechanism includes a detection module and a detection push rod. The lower end of the detection module has multiple detection seats arranged in an array. The output end of the detection push rod is connected to the upper end of the detection module and is used to drive the detection module to move up and down in the vertical direction, so that the detection seats are close to or away from the ground.

[0025] Through the above technical means, the detection module is lowered during testing to bring the detection base closer to the ground, reducing the attenuation of the detection signal and improving the detection depth and positioning accuracy; the detection module is raised during relocation to avoid damage to the detection components, thus balancing the requirements of detection accuracy and equipment protection.

[0026] In some embodiments, the drilling and grouting assembly further includes a transverse slide and a lifting seat. The transverse slide is slidably mounted on a transverse slide rail at the upper end of the vehicle body and is driven to move laterally by a transverse screw drive mechanism. Multiple drilling guide rods are vertically arranged on the transverse sliding block. The lifting block is slidably sleeved on the drilling guide rods and is driven to rise and fall along the guide rods by a vertical telescopic rod. The drill rod is rotatably mounted on the lifting block through a bearing seat.

[0027] In some embodiments, a drilling motor is fixedly mounted on the lifting seat, a second drilling gear is fixedly mounted on the output end of the drilling motor, and a first drilling gear is fixedly mounted on the drill rod. The first drilling gear and the second drilling gear mesh with each other to drive the drill rod to rotate and drill.

[0028] The beneficial effects of this invention are: This invention adopts a multi-mixing structure of longitudinal forced convection + revolution and rotation composite mixing, combined with jet-assisted disturbance, which fundamentally solves the problems of synchronous rotation of materials, uneven mixing and the existence of mixing dead corners in traditional mixing. The slurry homogenization speed is fast and the uniformity is good, which can effectively ensure the consistent solidification strength of the soil after grouting and improve the reinforcement quality.

[0029] This invention integrates foundation detection, grout preparation, and drilling and grouting functions into one unit. With the integrated drilling and grouting drill rod structure, drilling and grouting can be carried out simultaneously and continuously, eliminating the multiple steps of traditional processes such as drilling first, moving the machine, and then grouting. At the same time, it can detect and locate defect points in real time, eliminating the need for manual advance surveying and marking, realizing streamlined continuous construction and significantly shortening the construction cycle.

[0030] This invention utilizes a hollow shaft frame spray structure to construct a full-channel self-cleaning system, which can automatically flush the inner wall of the mixing cylinder, the conveying pipeline, and the drill pipe channel throughout the entire process. This effectively avoids pipeline and nozzle blockage caused by slurry residue solidification, extends the service life of the equipment, and significantly reduces the difficulty and cost of manual cleaning and maintenance.

[0031] This invention integrates all functions into a single mobile vehicle, making it highly mobile and flexible, capable of continuous operation along highways; it features a high degree of robotic operation, reducing human intervention, and strong construction standardization and reliability, adapting to complex soft soil foundation conditions along highways, and possessing outstanding engineering practicality and promotional value. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of one side of the complete set of equipment of the present invention; Figure 2 This is a schematic diagram of the bottom structure of the complete set of equipment of the present invention; Figure 3 This is a schematic diagram of the detection mechanism of the present invention; Figure 4 This is a schematic diagram of one side of the floating stirring mechanism of the present invention; Figure 5 This is a schematic diagram of the other side of the floating stirring mechanism of the present invention; Figure 6 This is a schematic diagram of the drilling and grouting assembly of the present invention; Figure 7 This is a schematic diagram of the elastic rod assembly of the present invention.

[0033] In the picture: vehicle body 100, wheel assembly 101; Mixing cylinder 200, feeding pump 201, stirring motor 202, drive gear 203, driven gear 204, feeding box 205, positioning frame 206, fixing ring 207, water supply pipe 208, stirring shaft 209; Mounting ring 210, protrusion 211, stirring shaft 212, stirring blade 213, spiral blade 214, spray hole 215, stirring frame 216, drive disk 217, elastic rod assembly 218, rotating arm 219, friction surface 220, elastic slide bar 221, transmission wheel 222, elastic sleeve 223; Water pump 300, water tank 301, connecting riser pipe 302; Drilling and grouting assembly 400, mounting base 401, vertical telescopic rod 402, auxiliary outer frame 403, first drilling gear 404, bearing seat 405, drilling guide rod 406, guide sleeve 407, bearing seat 408, drill rod 409, spray hole 410, drill bit 411, transverse slide rail 412, transverse motor 413, transverse screw 414, transverse sliding block 415, lifting seat 416, drilling motor 417, positioning column 418, second drilling gear 419; Detection seat 500, detection module 501, detection push rod 502. Detailed Implementation

[0034] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0035] like Figures 1-7 As shown in the figure, this embodiment provides a complete set of equipment for grouting and mixing reinforcement of soft soil foundation for highway subgrade, including a vehicle body 100. The vehicle body 100 is equipped with wheel sets 101 on its side, allowing it to move along the highway surface. A slurry mixing mechanism is integrated at the upper end of the vehicle body 100, a detection mechanism is installed at the bottom of the vehicle body 100, and a drilling and grouting assembly 400 is installed at the rear of the vehicle body 100. The entire set of equipment can independently complete the entire process of subgrade defect detection, slurry preparation, and drilling and grouting reinforcement.

[0036] In this embodiment, the slurry mixing mechanism includes a mixing cylinder 200, a feeding mechanism is provided on one side of the upper end of the mixing cylinder 200, and a central stirring shaft 209 is rotatably provided at the center of the mixing cylinder 200. The upper end of the central stirring shaft 209 is connected to a stirring drive mechanism for driving the central stirring shaft 209 to rotate.

[0037] In this example, the stirring drive mechanism includes a stirring motor 202, a drive gear 203, and a driven gear 204. The driven gear 204 is fixedly sleeved on the upper outer side of the central stirring shaft 209, and the drive gear 203 is fixedly mounted on the output end of the stirring motor 202. The drive gear 203 and the driven gear 204 mesh with each other. The stirring motor 202 is fixedly mounted on the upper end face of the mixing drum 200. During operation, the stirring motor 202 drives the drive gear 203 to rotate, and through gear meshing, drives the driven gear 204 to rotate synchronously with the central stirring shaft 209, providing rotational power for the mixing operation.

[0038] In this embodiment, a spiral blade 214 is fixedly installed at the bottom of the central stirring shaft 209. When the spiral blade 214 rotates synchronously with the central stirring shaft 209, it generates a continuous axial upward thrust on the slurry at the bottom of the cylinder, forcing the bottom material to move upward and the upper material to backfill downward, forming a stable vertical circulation flow in the mixing cylinder 200. This breaks the laminar flow state where the slurry rotates synchronously with the stirring components, and eliminates the vertical stirring dead angle.

[0039] Multiple mixing racks 216 are arrayed on the outer side of the lower end of the central mixing shaft 209. These racks 216 revolve around the central mixing shaft 209, performing primary radial shear mixing of the slurry. Both the central mixing shaft 209 and the mixing racks 216 are hollow structures. The inner cavity of the mixing racks 216 is connected to the inner cavity of the central mixing shaft 209, and multiple injection holes 215 are distributed on the surface of the mixing racks 216. A water supply mechanism is connected to the upper end of the central mixing shaft 209. Pressurized water can enter the mixing racks 216 through the inner cavity of the central mixing shaft 209 and finally be ejected radially from the injection holes 215. During the mixing process, the high-speed water jet from the rotating jet can create jet turbulence, accelerating the dissolution and dispersion of powder and enhancing the mixing effect. Simultaneously, the water jet continuously washes the inner wall of the mixing cylinder 200, preventing the slurry from adhering and forming a layer. After construction, pressurized water can thoroughly flush the entire slurry contact channel to prevent slurry solidification and blockage.

[0040] In this example, the water supply mechanism includes a water pump 300, a water tank 301, a water delivery pipe 208, and a connecting vertical pipe 302. The connecting vertical pipe 302, acting as a rotary joint, is rotatably mounted on the upper end of the central stirring shaft 209. A fixing ring 207 is fixedly installed on the outer side of the connecting vertical pipe 302, and the fixing ring 207 is connected and fixed to the inner wall of the mixing cylinder 200 via a side rod, keeping the connecting vertical pipe 302 stationary. The upper end of the connecting vertical pipe 302 is connected to the water delivery pipe 208, and the other end of the water delivery pipe 208 is connected to the outlet end of the water pump 300. The suction end of the water pump 300 extends into the water tank 301, which is fixedly installed on the upper end of the vehicle body 100 for storing reserve water. This structure enables stable and sealed water delivery from a fixed pipeline to the rotating shaft while the central stirring shaft 209 continues to rotate.

[0041] The feeding mechanism includes a feeding box 205. The outer side of the feeding box 205 is connected and fixed to the side wall of the mixing cylinder 200 via a positioning frame 206. The bottom of the feeding box 205 is connected to the interior of the mixing cylinder 200 via a discharge channel, which is equipped with a discharge valve. During operation, the grouting powder is stored in the feeding box 205. By controlling the opening of the discharge valve, the feeding speed and amount can be precisely controlled, thereby achieving precise control of the grout ratio.

[0042] In this embodiment, a floating stirring mechanism is also provided on the outside of the central stirring shaft 209, which can revolve synchronously with the central stirring shaft 209 and generate its own rotation during the revolution, thus creating shear disturbance to the material.

[0043] In this example, the floating stirring mechanism includes a drive disk 217 fixedly sleeved on the outside of the central stirring shaft 209. Multiple rotating arms 219 are arranged in a circumferential array on the drive disk 217, with the inner ends of the rotating arms 219 hinged to the drive disk 217. Each rotating arm 219 is rotatably mounted with a driven stirring shaft 212. Multiple stirring blades 213 are distributed on the surface of the driven stirring shaft 212, and the stirring blades 213 on the multiple driven stirring shafts 212 are staggered to avoid shear dead angles. An elastic rod assembly 218 connects the rotating arms 219 to the drive disk 217, providing outward elastic support for the rotating arms 219.

[0044] The inner wall of the mixing cylinder 200 is provided with a friction drive component for driving the driven stirring shaft 212 to rotate. The friction drive component includes a mounting ring 210 fixedly mounted on the inner wall of the mixing cylinder 200, with a continuous friction surface 220 on the inner side of the mounting ring 210; the inner side of the mounting ring 210 also has a plurality of protrusions 211 arranged in an array, the surfaces of which are provided with friction surfaces 220 that are continuous with the inner side of the mounting ring 210. A drive wheel 222 is fixed to the upper end of the driven stirring shaft 212, and the drive wheel 222, supported by an elastic rod assembly 218, always abuts against the friction surface 220.

[0045] As the drive disc 217 revolves with the central stirring shaft 209, the transmission wheel 222 rolls along the friction surface 220, driving the driven stirring shaft 212 to rotate at high speed around its own axis by contact friction, thus forming a composite stirring effect of "revolutionary material gathering + rotational shearing". Simultaneously, when the transmission wheel 222 revolves past the protrusion 211, it is radially compressed by the protrusion 211, pushing the rotating arm 219 to swing inward, reducing the stirring radius; after leaving the protrusion 211, the elastic force of the elastic rod assembly 218 pushes the rotating arm 219 to return to its original position, restoring the stirring radius. Therefore, the stirring radius changes periodically and dynamically with revolution, and the stirring trajectory constantly changes, completely eliminating the annular blind zone formed by fixed-radius stirring.

[0046] In this embodiment, the elastic rod assembly 218 includes an elastic sleeve 223 and an elastic slide rod 221. The elastic slide rod 221 slides through the output end of the elastic sleeve 223, and the elastic slide rod 221 is connected to the inner wall of the elastic sleeve 223 by a spring assembly. The end of the elastic sleeve 223 is hinged to the surface of the drive disc 217 by a pin, and the other end of the elastic slide rod 221 is hinged to the side of the rotating arm 219 by a pin. The spring assembly provides a continuous outward elastic force, which ensures that the transmission wheel 222 and the friction surface 220 are in close contact to transmit frictional force, and can also adaptively contract when compressed, driving the rotating arm 219 to swing smoothly and absorb rigid impacts.

[0047] In this embodiment, the detection mechanism is located at the bottom of the vehicle body 100 to obtain the location of underground cavities and loose areas in the roadbed. The detection mechanism includes a detection module 501, which is a ground-penetrating radar detection module with a built-in high-frequency electromagnetic wave transmitting and receiving unit, enabling non-contact, non-destructive testing of underground soil density, cavities, and loose areas. Multiple detection seats 500 are arrayed at the lower end of the detection module 501. Each detection seat 500 has a built-in signal enhancement sensor for transmitting detection signals downwards and receiving reflected underground waves, improving the accuracy of cavity location.

[0048] The upper end of the detection module 501 is connected to a detection push rod 502, which can be an electric push rod or a hydraulic push rod, and can drive the detection module 501 to move up and down in the vertical direction. During the detection operation, the detection push rod 502 pushes the detection module 501 down, so that the detection seat 500 is close to the ground, reducing signal attenuation and improving detection depth and accuracy; when moving between sites, the detection push rod 502 drives the detection module 501 up and retracts, avoiding damage to the detection components from impacts.

[0049] In this embodiment, the drilling and grouting assembly 400 is located at the rear of the vehicle body 100 and is used to complete drilling and grouting operations. The drilling and grouting assembly 400 includes a drill rod 409, which has a material conveying channel inside. A drill bit 411 is fixedly installed at the lower end of the drill rod 409. A spray hole 410 is opened on the side wall of the drill rod 409 near the drill bit 411, and the spray hole 410 communicates with the material conveying channel inside the drill rod 409. A conveying pipe is rotatably connected to the upper end of the drill rod 409. An auxiliary outer frame 403 is fixedly installed at the end of the conveying pipe. The outer side of the auxiliary outer frame 403 is connected and fixed to the lifting seat 416 through a truss. The other end of the conveying pipe is connected to the discharge end of the feeding pump 201. The feeding pump 201 is installed at the upper end of the vehicle body 100, and the suction end of the feeding pump 201 communicates with the bottom discharge port of the mixing cylinder 200. This structure enables the fixed delivery pipe to deliver sealing grout into the rotating drill rod while the drill rod 409 is continuously rotating, ensuring continuous and stable grouting during drilling and injection operations.

[0050] The drill rod 409 is rotatably mounted on the lifting seat 416 via the bearing seat 405. The lifting seat 416 is connected to a position adjustment component, which can drive the drill rod 409 to achieve horizontal position adjustment and vertical feed adjustment.

[0051] In this embodiment, the position adjustment component includes a transverse slide block 415. A transverse slide rail 412 is provided at the upper end of the vehicle body 100, and the transverse slide block 415 is slidably mounted on the transverse slide rail 412. A threaded block is fixed to the side of the transverse slide block 415, and a transverse screw 414 is fitted onto the threaded block. One end of the transverse screw 414 is rotatably connected to a fixed block on the vehicle body 100, and the other end is connected to a transverse motor 413. When the transverse motor 413 drives the transverse screw 414 to rotate, the transverse slide block 415 is driven to slide left and right along the transverse slide rail 412 through threaded transmission, thereby realizing fine adjustment of the transverse position of the drill rod 409.

[0052] The upper end of the transverse slide 415 is connected to the mounting base 401 via multiple positioning pins 418. Multiple drilling guide rods 406 are also vertically mounted on the transverse slide 415. The lifting seat 416 is slidably fitted onto the drilling guide rods 406. A vertical telescopic rod 402 is fixedly mounted on the mounting base 401. The output end of the vertical telescopic rod 402 is connected to the lifting seat 416, which can push the lifting seat 416 to slide up and down along the drilling guide rods 406, thereby achieving vertical drilling feed of the drill rod 409.

[0053] A bearing seat 408 is also fixed on the transverse slide block 415. A guide sleeve 407 is rotatably mounted on the inner side of the bearing seat 408, and the drill rod 409 slides through the guide sleeve 407. The guide sleeve 407 can rotate synchronously with the drill rod 409 and allows the drill rod 409 to slide axially, thereby radially limiting and straightening the lower part of the drill rod 409, suppressing radial sway during high-speed rotation, and improving drilling stability and hole straightness.

[0054] In this embodiment, a drilling drive is provided on the lifting base 416 to drive the drill rod 409 to rotate and drill. The drilling drive includes a drilling motor 417 fixedly mounted on the lifting base 416. A second drilling gear 419 is fixedly mounted on the output end of the drilling motor 417, and a first drilling gear 404 is fixedly sleeved on the drill rod 409. The first drilling gear 404 and the second drilling gear 419 mesh with each other. When the drilling motor 417 is working, it drives the drill rod 409 to rotate through gear meshing, providing power for drilling and cutting.

[0055] The working principle of this device is as follows: Slurry mixing process: The grouting powder is added to the feeding box 205, and the powder is fed into the mixing cylinder 200 through the feeding valve; the stirring motor 202 is started, driving the central stirring shaft 209 to rotate, and the bottom spiral blades 214 push the slurry to form longitudinal convection, and the stirring frame 216 performs primary radial mixing; at the same time, the floating stirring mechanism revolves with the shaft, and the transmission wheel 222 rolls along the friction surface 220 to drive the driven stirring shaft 212 to rotate at high speed, performing shearing and stirring of the slurry, and the stirring radius changes periodically with the protrusion 211 to eliminate the stirring blind zone; during the mixing process, the water pump 300 is started, and pressurized water is sprayed out from the injection hole 215 through the hollow shaft to form a jet to assist mixing, and at the same time to flush the cylinder wall to prevent material adhesion.

[0056] Detection and positioning process: When the vehicle body 100 travels along the roadbed, the detection push rod 502 drives the detection module 501 to descend and get close to the ground. The detection seat 500 emits and receives electromagnetic wave signals, scans the underground soil condition in real time, and identifies the location of cavities and loose areas. After locating the defect point, the vehicle body stops on the spot, and the transverse motor 413 drives the transverse sliding seat 415 to move, and the fine-tuning drill rod 409 is aligned with the defect point.

[0057] Drilling and grouting process: The drilling motor 417 starts and drives the drill rod 409 to rotate. The vertical telescopic rod 402 pushes the lifting seat 416 down, and the drill bit 411 cuts the soil and drills. When the design depth is reached or during the drilling process, the feeding pump 201 starts and pumps the slurry mixed in the mixing cylinder 200 into the conveying channel of the drill rod 409. Finally, it is injected into the soil around the hole from the spray hole 410, realizing the synchronous and continuous operation of drilling and grouting, and completing the reinforcement of roadbed defects.

[0058] Self-cleaning process: After construction, the water pump 300 continuously supplies water, and clean water is sprayed out through the spray hole 215 to thoroughly rinse the inner wall of the mixing drum 200, the mixing components, and all slurry contact parts inside the drum; at the same time, clean water enters the inner cavity of the drill rod 409 through the feed pump 201 and the conveying pipe, and is discharged from the spray hole 410 to flush the entire slurry conveying pipeline and drill rod channel, remove residual slurry, and prevent solidification and blockage.

[0059] The above description is only a preferred embodiment of the present invention and is 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 slurry mixing mechanism, characterized in that, It includes a mixing cylinder, and a central stirring shaft is rotatably mounted at the center of the mixing cylinder. The upper end of the central stirring shaft is connected to a stirring drive mechanism for driving its rotation. The bottom of the central stirring shaft is fixed with helical blades, which push the material inside the cylinder to form a longitudinal convection circulation when the central stirring shaft rotates. A floating stirring mechanism is also provided on the central stirring shaft. The floating stirring mechanism revolves synchronously with the central stirring shaft and can rotate on its own axis during the revolution, thereby creating shear disturbance to the material.

2. The slurry mixing mechanism according to claim 1, characterized in that, The floating stirring mechanism includes a drive disk fixedly sleeved on the outside of the central stirring shaft. The drive disk is circumferentially hinged with multiple rotating arms, and each rotating arm is rotatably equipped with a driven stirring shaft. The outer surface of the driven stirring shaft is distributed with stirring blades. The inner wall of the mixing cylinder is provided with a friction transmission component. When the driven stirring shaft revolves with the drive disk, the friction transmission component drives the driven stirring shaft to rotate around its own axis.

3. The slurry mixing mechanism according to claim 2, characterized in that, The friction transmission component includes a mounting ring fixedly disposed on the inner wall of the mixing cylinder, and a continuous friction surface is provided on the inner side of the mounting ring; a transmission wheel is fixedly disposed at the upper end of the driven stirring shaft, and the transmission wheel abuts against the friction surface, thereby driving the driven stirring shaft to rotate by friction.

4. The slurry mixing mechanism according to claim 3, characterized in that, The inner side of the mounting ring is also provided with a plurality of protrusions arranged in an array, and the surface of the protrusions is provided with a friction surface that is continuous with the inner side of the mounting ring. An elastic rod assembly is connected between the rotating arm and the drive disc. The elastic rod assembly provides outward elastic support force to the rotating arm, so that the transmission wheel always abuts against the friction surface. As the drive wheel revolves and passes the protrusion, it is radially squeezed by the protrusion, which pushes the rotating arm to swing inward, thus achieving a periodic dynamic change in the stirring radius.

5. The slurry mixing mechanism according to claim 4, characterized in that, The elastic rod assembly includes an elastic sleeve and an elastic slide rod that slides through the elastic sleeve. A spring assembly is provided between the elastic slide rod and the inner wall of the elastic sleeve. The end of the elastic sleeve is hinged to the surface of the drive disk, and the end of the elastic slide rod is hinged to the side of the rotating arm.

6. The slurry mixing mechanism according to claim 1, characterized in that, The central stirring shaft has a hollow shaft structure. Multiple stirring racks are arranged in an array on the lower outer side of the central stirring shaft. The inner cavity of the stirring rack is connected to the inner cavity of the central stirring shaft. Multiple injection holes are distributed on the surface of the stirring rack. The upper end of the central stirring shaft is connected to a water supply mechanism, and pressurized water is sprayed out from the spray hole after passing through the central stirring shaft and the stirring frame.

7. The slurry mixing mechanism according to claim 6, characterized in that, The water supply mechanism includes a rotary joint, a water supply pipe, and a water pump. The rotary joint is rotatably connected to the upper end of the central stirring shaft, and the rotary joint is connected to the outlet end of the water pump through the water supply pipe.

8. The slurry mixing mechanism according to claim 1, characterized in that, The stirring drive mechanism includes a stirring motor, a drive gear, and a driven gear. The driven gear is fixedly sleeved on the outside of the central stirring shaft, and the drive gear is fixedly installed at the output end of the stirring motor. The drive gear and the driven gear mesh with each other.

9. The slurry mixing mechanism according to claim 1, characterized in that, A feeding mechanism is provided on one side of the upper end of the mixing cylinder. The feeding mechanism includes a feeding box, which is fixed to the side wall of the mixing cylinder by a positioning frame. The bottom of the feeding box is connected to the inside of the mixing cylinder through a discharge channel, and a discharge valve is provided in the discharge channel.

10. A complete set of equipment for grouting and mixing reinforcement of soft soil foundation for highway subgrade, characterized in that, The vehicle body includes a slurry mixing mechanism as described in any one of claims 1 to 9, and a drilling and grouting assembly is provided at the rear of the vehicle body. The drilling and grouting assembly includes a drill rod with an internal material conveying channel. A drill bit is provided at the lower end of the drill rod, and a spray hole connected to the material conveying channel is provided on the side wall of the drill rod near the drill bit. The upper end of the drill rod is connected to the bottom outlet of the mixing cylinder through a conveying pipeline. A feeding pump is provided on the conveying pipeline to realize synchronous and continuous drilling and grouting operations.

11. The complete set of equipment for grouting and mixing reinforcement of soft soil foundation for highway subgrade according to claim 10, characterized in that, The bottom of the vehicle body is equipped with a detection mechanism for detecting the location of underground cavities and loose areas in the roadbed.

12. The complete set of equipment for grouting and mixing reinforcement of soft soil foundation for highway subgrade according to claim 11, characterized in that, The detection mechanism includes a detection module and a detection push rod. The lower end of the detection module has multiple detection seats arranged in an array. The output end of the detection push rod is connected to the upper end of the detection module and is used to drive the detection module to move up and down in the vertical direction, so that the detection seats are close to or away from the ground.

13. The complete set of equipment for grouting and mixing reinforcement of soft soil foundation for highway subgrade according to claim 10, characterized in that, The drilling and grouting assembly also includes a transverse sliding block and a lifting block. The transverse sliding block is slidably mounted on a transverse slide rail at the upper end of the vehicle body and is driven to move laterally by a transverse screw drive mechanism. Multiple drilling guide rods are vertically arranged on the transverse sliding block. The lifting block is slidably sleeved on the drilling guide rods and is driven to rise and fall along the guide rods by a vertical telescopic rod. The drill rod is rotatably mounted on the lifting block through a bearing seat.

14. The complete set of equipment for grouting and mixing reinforcement of soft soil foundation for highway subgrade according to claim 13, characterized in that, A drilling motor is fixedly installed on the lifting base. A second drilling gear is fixedly installed at the output end of the drilling motor. A first drilling gear is fixedly sleeved on the drill rod. The first drilling gear and the second drilling gear mesh with each other to drive the drill rod to rotate and drill.

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