A device for treating and strengthening soft foundation of composite foundation

Abstract

The present invention relates to the field of foundation engineering technology, and specifically relates to a composite foundation soft foundation treatment and reinforcement device. It includes: a drill bit; a rod base coaxially and fixedly connected to the drill bit; two stirring rods symmetrically arranged and fixedly connected to the rod base; a drill pipe fixedly connected to the end of the rod base away from the drill bit and having a cavity formed inside; a material guiding pipe coaxially arranged inside the drill pipe and communicating with the two stirring rods; a reinforcement mechanism connected to the drill pipe, including a number of extrusion push plates and a number of extrusion rollers. The number of extrusion push plates is arranged at equal angles in the circumferential direction of the drill pipe, and a number of rows of extrusion rollers are rotatably arranged at equal intervals along the long side direction of the extrusion push plate; a speed matching spraying mechanism connected to the drill pipe, including a number of steel spikes, and the number of steel spikes are respectively arranged in the middle of a number of groups of extrusion rollers, and the steel spikes are slidably connected to the extrusion push plate. This device can ensure a reasonable ratio of soil and cement slurry, further improve the quality of the composite foundation, and prevent the collapse of holes.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation engineering, and specifically relates to a composite foundation soft foundation treatment and reinforcement device. Background Art

[0002] In the field of modern construction engineering, the treatment and reinforcement of composite foundation soft foundation is the core link to ensure the project quality and stability. With the rapid development of urbanization and the continuous advancement of infrastructure construction, the demand for soft soil foundation treatment in various construction projects has shown an explosive growth. However, a series of intractable problems have emerged in the actual construction process of traditional composite foundation soft foundation treatment and reinforcement devices.

[0003] Currently, the common reinforcement method mainly relies on the drill rod to stir the cement slurry in the hole to complete the operation. However, in actual operation, when the drill rod rotates, the soil on the hole wall is extremely easy to collapse due to being disturbed. When a large amount of soil mixes into the cement slurry, since soil is an inert material, too much soil will weaken the bonding force between cement particles. At the same time, the water contained in the soil will dilute the cement slurry, reducing its hardness, resulting in a significant decrease in the strength of the mixing pile, and seriously affecting the soft foundation reinforcement effect.

[0004] In addition, if the soil collapse occurs at the bottom of the hole, the consequences will be more serious. This will directly cause a fault in the cement slurry, and the upper and lower cement slurries cannot be effectively connected, reducing the overall strength of the cement pile and making it difficult to meet the design requirements. This not only weakens the improvement and fixation effect on the soft foundation, but also may cause safety hazards such as building foundation settlement and cracking, greatly increasing the later maintenance cost and safety risk.

[0005] It should be noted that when the soil content is too low, at this time, the cement slurry lacks sufficient filling and auxiliary materials, which will lead to an increase in cost. At the same time, due to the concentration of shrinkage stress, shrinkage cracking is likely to occur, and the mechanical properties difference from the surrounding soil increases, and the cooperative working ability becomes poor. As a result, the finally formed cement column and the hole cannot be well bonded. Summary of the Invention

[0006] Based on this, it is necessary to provide a composite foundation soft foundation treatment and reinforcement device for the problems of the existing technology.

[0007] To solve the problems of the existing technology, the technical solution adopted by the present invention is as follows:

[0008] A composite foundation soft foundation treatment and reinforcement device, comprising:

[0009] A drill bit;

[0010] A rod base, coaxially and fixedly connected to the drill bit;

[0011] Two stirring rods, in a symmetric state and fixedly connected to the rod base;

[0012] A drill pipe, fixedly connected to one end of the rod base away from the drill bit and having a cavity formed inside;

[0013] A material guiding pipe, coaxially arranged inside the drill pipe and communicating with two stirring rods;

[0014] A reinforcement mechanism, connected to the drill pipe, including a number of extrusion push plates and a number of extrusion rollers. The number of extrusion push plates is arranged at equal angles along the circumferential direction of the drill pipe, and a number of rows of extrusion rollers are rotatably arranged at equal intervals along the long side direction of the extrusion push plates;

[0015] A speed matching spraying mechanism, connected to the drill pipe, including a number of steel spikes. The number of steel spikes are respectively arranged in the middle of a number of groups of extrusion rollers, and the steel spikes are slidably connected to the extrusion push plates.

[0016] Further, a one-way nozzle is fixedly connected to one end of the stirring rod away from the rod base.

[0017] Further, the reinforcement mechanism further includes an extrusion head, a shaft disc, a number of top seats, a number of adapter pieces and a number of extrusion rods. The extrusion head is key-connected to one end of the drill pipe away from the drill bit. The shaft disc is arranged at one end of the extrusion head close to the drill bit and coaxially fixedly connected to the drill pipe. The number of top seats are arranged at equal angles along the circumferential direction of one end of the shaft disc away from the extrusion head, and the top seats are fixedly connected to the shaft disc. One ends of the number of adapter pieces are respectively hinged to the number of top seats, and the other ends are respectively hinged to the number of extrusion rods. The number of extrusion rods are the output ends of the reinforcement mechanism, and the number of extrusion rods drive the number of extrusion push plates to move during the movement process.

[0018] Further, the reinforcement mechanism further includes a number of wedge-shaped bottom blocks, a number of wedge-shaped sliders and a number of extrusion seats. The number of columns of wedge-shaped bottom blocks are arranged at equal angles along the circumferential direction of the drill pipe and fixedly connected to the outer wall of the drill pipe. The number of columns of wedge-shaped sliders are respectively fixedly connected to the output ends of the number of reinforcement mechanisms, and the number of wedge-shaped sliders are respectively slidably connected to the number of wedge-shaped bottom blocks. One ends of the number of extrusion seats are respectively fixedly connected to the number of wedge-shaped sliders, and the other ends are respectively fixedly connected to the corresponding extrusion push plates.

[0019] Further, the material guiding pipe includes a main pipe, a rotary connection pipe, a limit clamping plate and a sub-pipe. The sub-pipe is fixedly connected to the drill pipe and one end communicates with two stirring rods. One end of the rotary connection pipe is slidably connected to the sub-pipe, and the other end is slidably connected to the main pipe. The main pipe is coaxially fixedly connected to the drill pipe. The limit clamping plate is coaxially fixedly connected to the middle of the rotary connection pipe. A through hole is formed in the middle of the limit clamping plate. The rotary connection pipe is the movable end of the material guiding pipe, and the sub-pipe is the fixed end of the material guiding pipe.

[0020] Furthermore, the speed-matching spraying mechanism also includes a fixed pressure plate, a dynamic pressure plate, a current limiting spring and a plurality of positioning racks. The fixed pressure plate is fixedly connected to the fixed end of the material guide tube, the dynamic pressure plate is fixedly connected to the movable end of the material guide tube, the current limiting spring is coaxially sleeved on the outside of the material guide tube, one end of the current limiting spring is fixedly connected to the fixed pressure plate, and the other end is fixedly connected to the dynamic pressure plate. A plurality of positioning racks are arranged in an array at equal angles along the circumferential direction of the dynamic pressure plate, the positioning rack is fixedly connected to the dynamic pressure plate, and the positioning rack is the input end of the speed-matching spraying mechanism.

[0021] Furthermore, the speed-matching spraying mechanism also includes a plurality of positioning gears, a plurality of first bevel gears, a plurality of second bevel gears, a plurality of third bevel gears, a plurality of fourth bevel gears, a plurality of reversing gear sets and a plurality of transfer racks. The plurality of positioning gears are respectively connected to the input end of the speed-matching spraying mechanism in a transmission manner, the plurality of first bevel gears are respectively fixedly connected coaxially with the plurality of positioning gears, the plurality of second bevel gears are respectively meshed with the plurality of first bevel gears, the plurality of third bevel gears are respectively arranged on the outside of the drill rod and are respectively fixedly connected coaxially with the plurality of second bevel gears, the plurality of fourth bevel gears are respectively meshed with the plurality of third bevel gears, the input ends of the plurality of reversing gear sets are respectively fixedly connected coaxially with the plurality of fourth bevel gears, the plurality of transfer racks are respectively meshed with the output ends of the plurality of reversing gear sets, and the transfer racks are the output end of the speed-matching spraying mechanism.

[0022] Furthermore, the speed-matching spraying mechanism also includes a short adapter shaft and a protective cover. The protective cover is fixedly connected to the outer wall of the drill pipe. The short adapter shaft is slidably connected to the protective cover and one end is fixedly connected to the output end of the speed-matching spraying mechanism. After moving, the short adapter shaft pushes the corresponding steel spikes to extend out of the corresponding extrusion push plate. The short adapter shaft is the movable end of the speed-matching spraying mechanism.

[0023] Furthermore, the speed-matching spraying mechanism also includes a translation plate, a positioning plate and a limit spring. The positioning plate is fixedly connected to one end of the extrusion push plate close to the drill rod. The translation plate is arranged on the side of the positioning plate away from the extrusion push plate and is fixedly connected to the steel spike. The steel spike passes through the positioning plate and is slidingly connected to the extrusion push plate. The limit spring is coaxially sleeved on the outside of the steel spike. One end of the limit spring is fixedly connected to the translation plate, and the other end is fixedly connected to the positioning plate. The movable end of the speed-matching spraying mechanism corresponds to the translation plate.

[0024] Furthermore, the speed-controlled spraying mechanism also includes a bellows, one end of which is fixedly connected to the translation plate, and the other end of which is fixedly connected to the positioning plate.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] First: This device uses a combination of components such as an extrusion head, a shaft disc, a top seat, a transfer piece, and an extrusion rod. Driven by an external lifting power source, it can accurately move the extrusion push plate and the extrusion roller to the inner wall of the hole for rolling and ramming. At the same time, the cooperation of the wedge-shaped bottom block and the wedge-shaped slider provides limit and guidance for the movement of the extrusion rod, ensuring the accuracy and stability of the reinforcement action. This design can effectively enhance the density and bearing capacity of the inner wall of the hole and improve the reinforcement effect of soft foundation treatment;

[0027] Second: This device can automatically adjust the protrusion of the steel spikes according to the injection intensity of the cement slurry. When the soil content in the hole is too low and the flow rate of the cement slurry increases, the adapter tube of the material guide pipe moves, and through a series of transmissions, the steel spikes protrude to scrape the inner wall of the hole, generating more soil, ensuring a reasonable ratio of soil to cement slurry. This intelligent adjustment function makes the use of materials in the soft foundation treatment process more scientific and reasonable, further improving the quality of the composite foundation;

[0028] Third: This device is provided with two symmetrical stirring rods, which fully mix and stir the cement slurry and the soil driven by the drill pipe. The one-way nozzles on the stirring rods prevent the soil from flowing back, ensuring the smoothness of the cement slurry delivery channel, enabling the cement slurry to continuously and stably mix with the soil. This effectively avoids the fault phenomenon caused by uneven mixing, greatly improves the integrity and stability of the composite foundation, and thus improves the construction quality of soft foundation treatment and reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a three-dimensional structural schematic diagram of the embodiment;

[0030] Figure 2 is Figure 1 the enlarged view of the structure at A in

[0031] Figure 3 is Figure 1 the enlarged view of the structure at B in

[0032] Figure 4 is the front view of the embodiment;

[0033] Figure 5 is the front half-sectional view of the embodiment;

[0034] Figure 6 is Figure 5 the enlarged view of the structure at C in

[0035] Figure 7 is Figure 5 the enlarged view of the structure at D in

[0036] Figure 8 is Figure 5 the enlarged view of the structure at E in

[0037] Figure 9 It is a partial structural schematic diagram of the pacing spraying mechanism in the embodiment.

[0038] The reference numerals in the figure are:

[0039] 1. Drill bit; 2. Drill pipe; 3. Rod base; 5. Feeding pipe; 6. Main pipe; 7. Adapter pipe; 8. Limit clamping plate; 9. Sub-pipe; 10. Stirring rod; 11. One-way spray head; 12. Reinforcement mechanism; 13. Extrusion head; 14. Axial disc; 15. Top seat; 16. Adapter; 17. Wedge-shaped bottom block; 18. Extrusion rod; 19. Wedge-shaped slider; 20. Extrusion seat; 21. Extrusion push plate; 22. Extrusion roller; 23. Pacing spraying mechanism; 24. Steel thorn; 25. Translation plate; 26. Limit spring; 27. Positioning plate; 28. Corrugated cover; 29. Fixed pressure plate; 30. Moving pressure plate; 31. Flow-limiting spring; 32. Positioning rack; 33. Positioning gear; 34. First bevel gear; 35. Second bevel gear; 36. Third bevel gear; 37. Fourth bevel gear; 38. Reversing gear set; 39. Adapter rack; 40. Adapter short shaft; 41. Protective cover. Specific embodiments

[0040] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Refer to Figures 1 to 9 , a composite foundation soft ground treatment and reinforcement device, comprising:

[0042] Drill bit 1;

[0043] Rod base 3, fixedly connected coaxially with drill bit 1;

[0044] Two stirring rods 10, symmetrically arranged and fixedly connected with rod base 3;

[0045] Drill pipe 2, fixedly connected to the end of rod base 3 away from drill bit 1 and having a cavity formed inside;

[0046] Feeding pipe 5 (as shown in Figure 5 ), coaxially arranged inside drill pipe 2 and communicating with two stirring rods 10;

[0047] Reinforcement mechanism 12, connected to drill pipe 2, comprising a plurality of extrusion push plates 21 and a plurality of extrusion rollers 22, the plurality of extrusion push plates 21 are arranged at equal angles in the circumferential direction of drill pipe 2, and a plurality of rows of extrusion rollers 22 are rotatably arranged at equal intervals along the long side direction of extrusion push plate 21;

[0048] Pacing spraying mechanism 23, connected to drill pipe 2, comprising a plurality of steel thorns 24, the plurality of steel thorns 24 are respectively arranged in the middle of a plurality of groups of extrusion rollers 22, and steel thorn 24 is slidably connected to extrusion push plate 21.

[0049] When the device is in operation, when the drill pipe 2 is driven by an external rotary power source and approaches the construction position, the drill pipe 2 will rotate and drill the land through the drill bit 1. During this process, some of the soil formed in the drilling will be exported from the hole from bottom to top. After the drilling is formed, the cement slurry is sprayed out from the two stirring rods 10 through the material guiding pipe 5. At this time, the drill pipe 2 stops moving and only rotates, and the cement slurry will be mixed with the remaining soil in the hole after being sprayed out. The two stirring rods 10 will mix and stir the cement slurry and the soil to prevent the occurrence of fault phenomena due to uneven mixing. During this process, when the drilling reaches the predetermined depth, the drill pipe 2 stops moving axially into the hole and enters the stage of cement slurry injection and stirring. Although the drill bit 1 is still rotating at this stage, it should be clear that the hole formed during the drilling process is not a regular cylindrical shape, but under the action of the drill bit 1, a certain conical structure will be formed at the bottom of the hole. Therefore, when the drill pipe 2 stops advancing, due to the spatial structure characteristics of the drill bit 1 area, even if some soil has an upward movement trend driven by the rotation of the drill bit 1, under the action of gravity, these soils will fall back to the bottom of the hole. This kind of falling is not irregular, but will form a relatively stable accumulation state at the bottom of the hole, and will not cause the "hollowed out" phenomenon. In addition, during the injection process of the cement slurry, when the inner wall of the hole needs to be reinforced, the external lifting power source will drive a number of extrusion push plates 21 to move through the reinforcement mechanism 12 until a number of extrusion rollers 22 are pressed against the inner wall of the hole. Subsequently, when the drill pipe 2 rotates, the number of extrusion rollers 22 will roll and tamp the inner wall of the hole.

[0050] During the injection process of the cement slurry, when the inner wall of the hole needs to be reinforced, the external lifting power source will drive a number of extrusion push plates 21 to move through the reinforcement mechanism 12 until a number of extrusion rollers 22 are pressed against the inner wall of the hole. Subsequently, when the drill pipe 2 rotates, the number of extrusion rollers 22 will roll and tamp the inner wall of the hole.

[0051] At the same time, during the drilling process, the construction personnel need to observe the state and quantity of the excavated muck. If the amount of muck discharged is significantly less than the normal situation, and the muck is relatively dry, loose, without sufficient viscosity and humidity, this means that the soil content is too low. When the soil content in the hole is too low, the injection speed of the cement slurry increases. At this time, under the action of the speed-matching spraying mechanism 23, a number of steel spikes 24 extend out and scrape the inner wall of the hole to generate more soil, ensuring a reasonable ratio of soil to cement slurry (and during this process, the previously stopped drill pipe 2 needs to displace along the axis of the hole to facilitate the provision of more soil).

[0052] To prevent some soil from flowing back into the inside of the stirring rod 10 during the rotation of the stirring rod 10, the following features are specifically set:

[0053] A one-way nozzle 11 is fixedly connected to one end of the stirring rod 10 away from the rod base 3. During the process of the drill rod 2 driving the stirring rod 10 to rotate for mixing the cement slurry and the soil, the one-way nozzle 11 plays a key role. It only allows the cement slurry to spray out from the inside of the stirring rod 10 to the outside, while preventing the soil in the hole from flowing back into the inside of the stirring rod 10. This ensures the smoothness of the cement slurry conveying channel inside the stirring rod 10, avoids soil blockage of the stirring rod 10, and ensures that the cement slurry can continuously and stably spray out from the stirring rod 10 to mix with the soil, improving the reliability of the device operation and the effect of mixing and stirring.

[0054] To supplement the specific structure of the reinforcement mechanism 12, the following features are specifically set:

[0055] The reinforcement mechanism 12 further includes an extrusion head 13, a shaft disc 14, a plurality of top seats 15, a plurality of adapter pieces 16 and a plurality of extrusion rods 18. The extrusion head 13 is key-connected to one end of the drill rod 2 away from the drill bit 1. The shaft disc 14 is arranged at one end of the extrusion head 13 close to the drill bit 1 and is fixedly connected to the drill rod 2 coaxially. The plurality of top seats 15 are arranged at equal angles in the circumferential direction at one end of the shaft disc 14 away from the extrusion head 13. The top seats 15 are fixedly connected to the shaft disc 14. One ends of the plurality of adapter pieces 16 are respectively hinged to the plurality of top seats 15, and the other ends are respectively hinged to the plurality of extrusion rods 18. The plurality of extrusion rods 18 are the output ends of the reinforcement mechanism 12. During the movement of the plurality of extrusion rods 18, they drive the plurality of extrusion push plates 21 to move. When it is necessary to reinforce the inner wall of the hole, an external lifting power source acts on the extrusion head 13. Since the extrusion head 13 is key-connected to the drill rod 2, the movement of the extrusion head 13 will drive the shaft disc 14 to move. The top seats 15 on the shaft disc 14 move along with the shaft disc 14, and the force is transmitted to the extrusion rods 18 through the adapter pieces 16. The extrusion rods 18, as the output ends of the reinforcement mechanism 12, move under the drive of the adapter pieces 16, and then drive the connected extrusion push plates 21 to move, so that the extrusion rollers 22 on the extrusion push plates 21 can accurately press on the inner wall of the hole, realizing the reinforcement operation of the inner wall of the hole.

[0056] To limit the movement of the plurality of extrusion rods 18, the following features are specifically set:

[0057] The reinforcement mechanism 12 also includes a plurality of wedge-shaped bottom blocks 17, a plurality of wedge-shaped sliders 19 and a plurality of extrusion seats 20. A plurality of rows of wedge-shaped bottom blocks 17 are arranged at equal angles along the circumferential direction of the drill rod 2 and are fixedly connected to the outer wall of the drill rod 2. A plurality of rows of wedge-shaped sliders 19 are respectively fixedly connected to a plurality of extrusion rods 18. A plurality of wedge-shaped sliders 19 are respectively slidably connected to a plurality of wedge-shaped bottom blocks 17. One end of a plurality of extrusion seats 20 is respectively fixedly connected to a plurality of wedge-shaped sliders 19, and the other end is respectively fixedly connected to a corresponding extrusion push plate 21. In the process of the extrusion rod 18 moving and driving the extrusion push plate 21 to move, the cooperation between the wedge-shaped slider 19 and the wedge-shaped bottom block 17 plays a role of limiting and guiding. The wedge-shaped slider 19 slides on the wedge-shaped bottom block 17 to ensure that the extrusion rod 18 can only move in a specific direction, thereby ensuring that the extrusion push plate 21 can accurately approach or move away from the inner wall of the hole (at this time, the moving trajectory of the extrusion push plate 21 is an oblique movement). At the same time, the extrusion seat 20 connects the wedge-shaped slider 19 and the extrusion push plate 21, so that the movement of the wedge-shaped slider 19 can be stably transmitted to the extrusion push plate 21, ensuring the accuracy and stability of the action of the reinforcement mechanism 12.

[0058] In order to supplement the specific structure of the material guide tube 5, the following features are also specifically provided:

[0059] The guide pipe 5 includes a main pipe 6, a transfer pipe 7, a limit card plate 8 and a sub-pipe 9. The sub-pipe 9 is fixedly connected to the drill pipe 2 and one end of the sub-pipe is connected to the two stirring rods 10. One end of the transfer pipe 7 is slidably connected to the sub-pipe 9, and the other end is slidably connected to the main pipe 6. The main pipe 6 is coaxially fixed to the drill pipe 2. The limit card plate 8 is coaxially fixed to the middle part of the transfer pipe 7. A through hole is formed in the middle part of the limit card plate 8. The transfer pipe 7 is the movable end of the guide pipe 5, and the sub-pipe 9 is the fixed end of the guide pipe 5. During the cement slurry transportation process, the main pipe 6 plays a role in stabilizing the cement slurry transportation path to ensure that the cement slurry can flow smoothly to the stirring rods 10. As a movable end, the transfer pipe 7 can slide within a certain range to adapt to some changes during the operation of the device. When the cement slurry injection flow is fast, the fast-flowing cement slurry will generate a large pressure on the end of the transfer pipe 7 close to the main pipe 6, pushing the transfer pipe 7 to move toward the sub-pipe 9.

[0060] In order to supplement the specific structure of the speed-matching spraying mechanism 23, so that when the cement slurry injection intensity increases, the transfer tube 7 can move, thereby providing power for starting the speed-matching spraying mechanism 23, the following features are also specifically set:

[0061] The pacing spraying mechanism 23 further includes a fixed pressure plate 29, a moving pressure plate 30, a current-limiting spring 31 and a plurality of positioning racks 32. The fixed pressure plate 29 is fixedly connected to the secondary pipe 9, the moving pressure plate 30 is fixedly connected to the adapter pipe 7, the current-limiting spring 31 is coaxially sleeved outside the material guiding pipe 5, one end of the current-limiting spring 31 is fixedly connected to the fixed pressure plate 29, and the other end is fixedly connected to the moving pressure plate 30. The plurality of positioning racks 32 are arranged at equal angles in the circumferential direction of the moving pressure plate 30, and the positioning racks 32 are fixedly connected to the moving pressure plate 30. The positioning racks 32 are the input ends of the pacing spraying mechanism 23. When the injection strength of the cement slurry increases, the cement slurry generates a large pressure on the adapter pipe 7, and the adapter pipe 7, as the movable end of the material guiding pipe 5, will move. The moving pressure plate 30 moves along with the adapter pipe 7 and compresses the current-limiting spring 31. The current-limiting spring 31 plays a role in buffering and adjusting, preventing the moving pressure plate 30 from moving too fast and preparing for the reset of the adapter pipe 7. At the same time, the movement of the moving pressure plate 30 drives the positioning racks 32 to move. The positioning racks 32, as the input ends of the pacing spraying mechanism 23, convert the movement of the adapter pipe 7 into the power input for the subsequent actions of the pacing spraying mechanism 23, providing a prerequisite for the extension of the steel spikes 24.

[0062] To supplement the specific structure of the pacing spraying mechanism 23, the following features are specifically set:

[0063] The pacing spraying mechanism 23 further includes a plurality of positioning gears 33, a plurality of first bevel gears 34, a plurality of second bevel gears 35, a plurality of third bevel gears 36, a plurality of fourth bevel gears 37, a plurality of reversing gear sets 38 and a plurality of transfer racks 39. The plurality of positioning gears 33 are respectively meshed with the plurality of positioning racks 32, the plurality of first bevel gears 34 are respectively coaxially fixedly connected to the plurality of positioning gears 33, the plurality of second bevel gears 35 are respectively meshed with the plurality of first bevel gears 34, the plurality of third bevel gears 36 are respectively arranged outside the drill pipe 2 and coaxially fixedly connected to the plurality of second bevel gears 35, the plurality of fourth bevel gears 37 are respectively meshed with the plurality of third bevel gears 36, the input ends of the plurality of reversing gear sets 38 are respectively coaxially fixedly connected to the plurality of fourth bevel gears 37, and the plurality of transfer racks 39 are respectively meshed with the output ends of the plurality of reversing gear sets 38. The transfer racks 39 are the output ends of the pacing spraying mechanism 23. When the positioning racks 32 move, the positioning racks 32 drive the positioning gears 33 meshed with them to rotate. The rotation of the positioning gears 33 drives the first bevel gears 34 coaxially fixedly connected thereto to rotate. The first bevel gears 34 are meshed with the second bevel gears 35 to transmit power to the second bevel gears 35. The second bevel gears 35 drive the third bevel gears 36 coaxially fixedly connected thereto to rotate. The third bevel gears 36 are meshed with the fourth bevel gears 37 to transmit power to the fourth bevel gears 37. The fourth bevel gears 37 drive the transfer racks 39 to move through the reversing gear sets 38. The transfer racks 39, as the output ends of the pacing spraying mechanism 23, transmit power to the subsequent components to realize the extension action of the steel spikes 24.

[0064] To prevent the soil and cement slurry in the hole from interfering with the movement of the transfer rack 39, the following features are specifically set:

[0065] The speed-matching spraying mechanism 23 further includes a transfer short shaft 40 and a protective cover 41. The protective cover 41 is fixedly connected to the outer wall of the drill pipe 2. The transfer short shaft 40 is slidably connected to the protective cover 41 and fixedly connected to the transfer rack 39 at one end. After the transfer short shaft 40 moves, it pushes the corresponding steel thorn 24 to protrude from the corresponding extrusion push plate 21. The transfer short shaft 40 is the moving end of the speed-matching spraying mechanism 23. When the transfer rack 39 moves, the transfer rack 39 drives the transfer short shaft 40 fixedly connected to it to move. The protective cover 41 plays a role in protecting the transfer short shaft 40 and the transfer rack 39, preventing the soil and cement slurry in the hole from interfering with the movement of the transfer short shaft 40 and ensuring that the transfer short shaft 40 can move smoothly. As the moving end of the speed-matching spraying mechanism 23, after moving, the transfer short shaft 40 can accurately push the corresponding steel thorn 24 to protrude from the extrusion push plate 21, realizing the scraping operation on the inner wall of the hole.

[0066] To limit the movement of the steel thorn 24 and ensure that when several extrusion rollers 22 roll and extrude the inner wall of the hole, several steel thorns 24 will not scrape the inner wall of the hole, the following features are specifically set:

[0067] The speed-matching spraying mechanism 23 further includes a translation plate 25, a positioning plate 27 and a limiting spring 26. The positioning plate 27 is fixedly connected to one end of the extrusion push plate 21 close to the drill pipe 2. The translation plate 25 is arranged on the side of the positioning plate 27 away from the extrusion push plate 21 and fixedly connected to the steel thorn 24. The steel thorn 24 passes through the positioning plate 27 and is slidably connected to the extrusion push plate 21. The limiting spring 26 is coaxially sleeved outside the steel thorn 24. One end of the limiting spring 26 is fixedly connected to the translation plate 25, and the other end is fixedly connected to the positioning plate 27. Several transfer short shafts 40 correspond to several translation plates 25. Under normal circumstances, the limiting spring 26 is in a normal state, ensuring that when several extrusion rollers 22 roll and extrude the inner wall of the hole, several steel thorns 24 will not scrape the inner wall of the hole. When the transfer short shaft 40 moves to push the translation plate 25 (it should be noted that here the transfer short shaft 40 and the translation plate 25 are designed as separate parts and are in point-to-plane contact when contacting, so as to ensure that after the translation plate 25 moves with the extrusion push plate 21, the transfer short shaft 40 can still contact the translation plate 25 when moving), the translation plate 25 overcomes the elastic force of the limiting spring 26 and drives the steel thorn 24 to protrude from the extrusion push plate 21. The setting of the limiting spring 26 plays a role of limiting and buffering, ensuring the stable and reliable extension and retraction actions of the steel thorn 24.

[0068] To protect the steel thorn 24 and the limiting spring 26, the following features are specifically set:

[0069] The pacing spraying mechanism 23 further includes a corrugated cover 28. One end of the corrugated cover 28 is fixedly connected to the translation plate 25, and the other end is fixedly connected to the positioning plate 27. During the movement of the steel spikes 24 along with the translation plate 25, the corrugated cover 28 can protect the steel spikes 24 and the limiting spring 26. It can prevent the soil and cement slurry in the holes from entering the area where the steel spikes 24 and the limiting spring 26 are located, avoid the influence of soil and cement slurry on the sliding of the steel spikes 24 and the elastic performance of the limiting spring 26, extend the service life of the steel spikes 24 and the limiting spring 26, and ensure the normal operation of the pacing spraying mechanism 23.

[0070] The working principle of this device is that during the composite foundation soft foundation treatment and reinforcement operation, first, the drill pipe 2 of the device is driven by an external rotary power source. When the drill pipe 2 approaches the construction position, it starts to rotate, and the drill bit 1 installed at one end of the drill pipe 2 rotates accordingly and drills the land. During the drilling process, the drill bit 1 continuously breaks the soil, and part of the soil formed in the drill holes is exported from the holes from bottom to top. As the drilling progresses, when the appropriate depth is reached, the drilling operation is completed.

[0071] At this time, the cement slurry is transported through the material guiding pipe 5. The material guiding pipe 5 is composed of a main pipe 6, a rotary connecting pipe 7, a limiting clamping plate 8, and a sub-pipe 9. The cement slurry first enters the main pipe 6, then passes through the slidable rotary connecting pipe 7 and the sub-pipe 9, and finally sprays out from two stirring rods 10 communicating with the sub-pipe 9. A one-way nozzle 11 is fixedly connected to one end of the stirring rod 10 away from the rod seat 3 to ensure that the cement slurry can only spray out from the stirring rod 10 and prevent the soil from flowing back into the inside of the stirring rod 10. At the same time, the previously stopped drill pipe 2 needs to perform a displacement along the axis direction of the hole to provide more soil. The two stirring rods 10 drive by the drill pipe 2 mix and stir the sprayed cement slurry and the remaining soil in the hole to avoid the occurrence of fault phenomena due to uneven mixing.

[0072] When it is necessary to reinforce the inner wall of the hole, the external lifting power source comes into play. The extrusion head 13 in the reinforcement mechanism 12 is key-connected to the drill pipe 2, and the external lifting power source drives the extrusion head 13 to move, thereby driving the shaft disc 14 to move. The top seat 15 on the shaft disc 14 drives the extrusion rod 18 to move through the adapter 16. The extrusion rod 18, as the output end of the reinforcement mechanism 12, drives the extrusion push plate 21 connected to it to move. During the movement of the extrusion rod 18, the wedge-shaped slider 19 slides on the wedge-shaped base block 17, playing a role of limiting and guiding to ensure that the extrusion push plate 21 accurately approaches the inner wall of the hole, so that several extrusion rollers 22 on the extrusion push plate 21 are extruded on the inner wall of the hole. Subsequently, the rotation of the drill pipe 2 drives the extrusion rollers 22 to roll and compact the inner wall of the hole, enhancing the stability of the inner wall of the hole.

[0073] During the drilling process, construction workers need to observe the state and quantity of the excavated muck. If the muck output is significantly less than normal, and the muck is relatively dry, loose, without sufficient viscosity and humidity, it means that the soil content is too low. When the soil content in the hole is too low, the injection flow rate of the cement slurry needs to be increased. At this time, the pacing spraying mechanism 23 starts to work. The cement slurry generates a large pressure on the transfer pipe 7, and the transfer pipe 7, as the movable end of the material guiding pipe 5, moves, driving the movable pressure plate 30 to move and compress the current-limiting spring 31. The movement of the movable pressure plate 30 causes the positioning rack 32 to move, and the positioning rack 32 drives the positioning gear 33 to rotate, finally causing the transfer rack 39 to move. The transfer rack 39 drives the transfer short shaft 40 to slide in the protective cover 41, and the transfer short shaft 40 pushes the translation plate 25. The translation plate 25 overcomes the elastic force of the limit spring 26 and drives the steel spikes 24 to extend from the extrusion push plate 21. After the steel spikes 24 extend, they scrape the inner wall of the hole to generate more soil, ensuring a reasonable ratio of soil to cement slurry. At the same time, when the steel spikes 24 extend, the injection speed of the cement slurry will increase. At this time, the cement slurry will exert a large pressure and impact force on the hole wall in a short time, which poses a serious threat to the stability of the hole wall. The steel spikes 24 extending and scraping the inner wall of the hole can form a buffer layer on the inner wall surface of the hole, which is preliminarily mixed with loose soil and cement slurry. On the one hand, this buffer layer increases the internal friction of the soil on the inner wall of the hole and improves the shear strength of the soil; on the other hand, it can disperse the impact force when the cement slurry is injected, convert the concentrated stress into distributed stress, effectively reduce the risk of collapse of the inner wall of the hole, and provide a reliable guarantee for construction safety.

[0074] The above embodiments only represent one or several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

1. A composite foundation soft foundation treatment and reinforcement device, characterized in that: include: Drill bit (1); A rod seat (3) is coaxially fixedly connected to the drill bit (1); Two stirring rods (10) are symmetrical and fixedly connected to the rod base (3); A drill rod (2) is fixedly connected to an end of a rod seat (3) away from the drill bit (1) and has a cavity formed inside; A material guide pipe (5) is coaxially arranged inside the drill rod (2) and is connected to the two stirring rods (10); The reinforcement mechanism (12) is connected to the drill rod (2), and comprises a plurality of extrusion push plates (21) and a plurality of extrusion rollers (22). The plurality of extrusion push plates (21) are arranged in an array at equal angles along the circumference of the drill rod (2), and the extrusion push plates (21) are arranged to rotate at equal intervals along the long side direction with a plurality of rows of extrusion rollers (22); The speed-controlled spraying mechanism (23) is connected to the drill rod (2) and comprises a plurality of steel spikes (24). The plurality of steel spikes (24) are respectively arranged at the middle of a plurality of groups of squeezing rollers (22). The steel spikes (24) are slidably connected to the squeezing push plate (21); One end of the stirring rod (10) away from the rod seat (3) is fixedly connected to a one-way nozzle (11); The reinforcement mechanism (12) further comprises an extrusion head (13), an axis disk (14), a plurality of top seats (15), a plurality of adapters (16) and a plurality of extrusion rods (18); the extrusion head (13) is connected to an end of the drill rod (2) away from the drill bit (1); the axis disk (14) is arranged at an end of the extrusion head (13) close to the drill bit (1) and is fixedly connected to the drill rod (2) coaxially; the plurality of top seats (15) are arranged in an array at equal angles along the circumferential direction of the end of the axis disk (14) away from the extrusion head (13); the top seats (15) are fixedly connected to the axis disk (14); one end of the plurality of adapters (16) is respectively hinged to the plurality of top seats (15) and the other end is respectively hinged to the plurality of extrusion rods (18); the plurality of extrusion rods (18) are output ends of the reinforcement mechanism (12); and the plurality of extrusion rods (18) drive the plurality of extrusion push plates (21) to move during movement.

2. A composite foundation soft foundation treatment and reinforcement device according to claim 1, characterized in that: The reinforcement mechanism (12) further comprises a plurality of wedge-shaped bottom blocks (17), a plurality of wedge-shaped sliding blocks (19) and a plurality of extrusion seats (20); a plurality of rows of wedge-shaped bottom blocks (17) are arranged at equal angles along the circumferential direction of the drill rod (2) and are fixedly connected to the outer wall of the drill rod (2); a plurality of rows of wedge-shaped sliding blocks (19) are respectively fixedly connected to the output ends of the plurality of reinforcement mechanisms (12); a plurality of wedge-shaped sliding blocks (19) are respectively slidably connected to the plurality of wedge-shaped bottom blocks (17); one end of the plurality of extrusion seats (20) is respectively fixedly connected to the plurality of wedge-shaped sliding blocks (19) and the other end is respectively fixedly connected to the corresponding extrusion push plates (21).

3. The composite foundation soft foundation treatment and reinforcement device according to claim 1, characterized in that: The material guide pipe (5) comprises a main pipe (6), a transfer pipe (7), a limit clamping plate (8) and a secondary pipe (9). The secondary pipe (9) is fixedly connected to the drill rod (2) and one end of the secondary pipe is connected to the two stirring rods (10). One end of the transfer pipe (7) is slidably connected to the secondary pipe (9) and the other end is slidably connected to the main pipe (6). The main pipe (6) is coaxially fixedly connected to the drill rod (2). The limit clamping plate (8) is coaxially fixedly connected to the middle part of the transfer pipe (7). A through hole is formed in the middle part of the limit clamping plate (8). The transfer pipe (7) is the movable end of the material guide pipe (5), and the secondary pipe (9) is the fixed end of the material guide pipe (5).

4. The composite foundation soft foundation treatment and reinforcement device according to claim 1, characterized in that: The speed-matching spraying mechanism (23) further comprises a fixed pressure plate (29), a dynamic pressure plate (30), a current limiting spring (31) and a plurality of positioning racks (32); the fixed pressure plate (29) is fixedly connected to the fixed end of the material guide tube (5); the dynamic pressure plate (30) is fixedly connected to the movable end of the material guide tube (5); the current limiting spring (31) is coaxially sleeved on the outside of the material guide tube (5); one end of the current limiting spring (31) is fixedly connected to the fixed pressure plate (29) and the other end is fixedly connected to the dynamic pressure plate (30); a plurality of positioning racks (32) are arranged in an array at equal angles along the circumferential direction of the dynamic pressure plate (30); the positioning racks (32) are fixedly connected to the dynamic pressure plate (30); and the positioning racks (32) are the input end of the speed-matching spraying mechanism (23).

5. The composite foundation soft foundation treatment and reinforcement device according to claim 1, characterized in that: The speed-matching spraying mechanism (23) further comprises a plurality of positioning gears (33), a plurality of first bevel gears (34), a plurality of second bevel gears (35), a plurality of third bevel gears (36), a plurality of fourth bevel gears (37), a plurality of reversing gear sets (38) and a plurality of transfer racks (39). The plurality of positioning gears (33) are respectively connected to the input end of the speed-matching spraying mechanism (23) in a transmission manner, the plurality of first bevel gears (34) are respectively connected to the plurality of positioning gears (33) coaxially, and the plurality of second bevel gears (35) are respectively connected to the plurality of third bevel gears (36), a plurality of fourth bevel gears (37), a plurality of reversing gear sets (38) and a plurality of transfer racks (39). A plurality of third bevel teeth (36) are respectively arranged on the outside of the drill rod (2) and are coaxially fixedly connected to the plurality of second bevel teeth (35); a plurality of fourth bevel teeth (37) are respectively meshed with the plurality of third bevel teeth (36); the input ends of the plurality of reversing gear sets (38) are respectively coaxially fixedly connected to the plurality of fourth bevel teeth (37); a plurality of transfer racks (39) are respectively meshed with the output ends of the plurality of reversing gear sets (38); and the transfer racks (39) are the output ends of the speed-matching spraying mechanism (23).

6. The composite foundation soft foundation treatment and reinforcement device according to claim 1, characterized in that: The speed-matching spraying mechanism (23) further comprises a short adapter shaft (40) and a protective cover (41), wherein the protective cover (41) is fixedly connected to the outer wall of the drill rod (2), the short adapter shaft (40) is slidably connected to the protective cover (41) and one end of the short adapter shaft (40) is fixedly connected to the output end of the speed-matching spraying mechanism (23), and after the short adapter shaft (40) moves, it pushes the corresponding steel spike (24) to extend out from the corresponding extrusion push plate (21), and the short adapter shaft (40) is the movable end of the speed-matching spraying mechanism (23).

7. The composite foundation soft foundation treatment and reinforcement device according to claim 1, characterized in that: The speed-matching spraying mechanism (23) further comprises a translation plate (25), a positioning plate (27) and a limit spring (26). The positioning plate (27) is fixedly connected to one end of the extrusion push plate (21) close to the drill rod (2). The translation plate (25) is arranged on a side of the positioning plate (27) away from the extrusion push plate (21) and is fixedly connected to the steel spike (24). The steel spike (24) passes through the positioning plate (27) and is slidably connected to the extrusion push plate (21). The limit spring (26) is coaxially sleeved on the outside of the steel spike (24). One end of the limit spring (26) is fixedly connected to the translation plate (25), and the other end is fixedly connected to the positioning plate (27). The movable end of the speed-matching spraying mechanism (23) corresponds to the translation plate (25).

8. The composite foundation soft foundation treatment and reinforcement device according to claim 7, characterized in that: The speed-controlled spraying mechanism (23) further comprises a bellows (28), one end of which is fixedly connected to the translation plate (25) and the other end of which is fixedly connected to the positioning plate (27).

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