Reinforcement treatment construction method for muddy silty clay roadbed in coastal section

Abstract

The invention discloses a coastal section mucky silty clay roadbed reinforcement treatment construction method, and relates to the technical field of building construction, and the method comprises the following steps: S1, detecting a foundation; s2, planning the initial shape of the pile hole of the cement mixing pile according to the detection result; s3, constructing a corresponding digital model according to the structure and the material of the drilling tool; s4, combining the initial shape of the pile hole of the cement mixing pile with the digital model of the drilling tool to obtain a construction route and a construction rule of the drilling tool in the foundation; and S5, the formed cement mixing pile is constructed according to the construction route and the construction rule. According to the construction method, constructors can conveniently and efficiently construct and form the cement mixing pile with the matched reinforcing effect according to the distribution condition of the muddy silty clay of the coastal section.

Description

Technical Field

[0001] This application relates to the technical field of building construction, and in particular to a construction method for reinforcing silty clay subgrade in coastal sections. Background Technology

[0002] The silty clay soil in coastal areas is a type of soft soil foundation, formed by long-term erosion from seawater erosion. It is abundant within islands and is widely distributed and deep. This type of soft soil foundation has poor permeability, high silt content, large plastic deformation, and strong instability. Furthermore, coastal areas are affected by tidal water, leading to significant roadbed settlement. Therefore, road construction on silty clay soil sometimes requires reinforcement design for this type of soft soil roadbed.

[0003] Existing soft soil foundation reinforcement technologies typically include dynamic compaction, grouting, replacement, pile treatment, and mixing with inorganic binders. Due to the high price of lime in coastal areas, cement mixing pile reinforcement is usually the preferred option. Cement mixing pile reinforcement technology mixes cement slurry with soil to form a high-strength composite foundation, which can effectively improve the bearing capacity and stability of soft soil foundations.

[0004] However, due to the irregular distribution of silty clay in the coastal section, the reinforcement effect of cement mixing piles constructed in the same way on soft soil foundations will be different, and there may be cases where the reinforcement effect of cement mixing piles cannot be met.

[0005] Therefore, there is an urgent need for a more efficient and effective construction method for reinforcing silty clay subgrades in coastal sections. Summary of the Invention

[0006] This application provides a construction method for reinforcing silty clay subgrade in coastal sections, which enables construction personnel to efficiently construct cement mixing piles with matching reinforcement effects based on the distribution of silty clay in coastal sections.

[0007] This application provides a construction method for reinforcing silty clay subgrade in coastal sections, employing the following technical solution: A construction method for reinforcing silty clay subgrade in coastal sections includes the following steps: S1, Detecting the foundation; S2. Based on the detection results, plan the preliminary shape of the cement mixing pile hole; S3. Construct a corresponding digital model based on the structure and material of the drill bit; S4. Combine the preliminary shape of the cement mixing pile hole with the digital model of the drilling tool to obtain the construction route and construction rules of the drilling tool in the foundation. S5. Construct and shape cement mixing piles according to the construction route and construction rules; Among them, the radial dimensions of cement mixing piles vary at different locations after they are constructed and formed, and the drilling tools include drill rods and multiple mixing devices; Multiple stirring devices are spaced apart on the drill rod along the axial direction of the drill rod, and each stirring device includes multiple adjustable stirring blades and an adjustment assembly for adjusting the multiple stirring blades; One end of the stirring blade is rotatably connected to the drill rod, and its rotation axis is parallel to the axis of the drill rod, and the adjustment component is disposed inside the drill rod.

[0008] By adopting the above technical solution, construction personnel can efficiently and effectively complete the forming of cement mixing pile holes according to the distribution of silty clay in the coastal section of the foundation. This enables efficient and high-quality construction of cement mixing piles with matching reinforcement effects, thereby effectively improving the reinforcement effect on the silty clay foundation in the coastal section.

[0009] Optionally, the adjustment assembly includes a drive wheel and a first drive element; The drive wheel is rotatably connected to the drill rod, and its rotation axis coincides with its own axis and the axis of the drill rod. The first driving member is used to drive the drive wheel to rotate. The stirring blade has a driven wheel at one end near the drill rod. The driven wheel meshes with the driving wheel, and the axis of the driven wheel coincides with the rotation axis of the stirring blade.

[0010] By adopting the above technical solution, construction personnel can easily adjust and control the radial dimensions of the pile hole during the construction and forming of cement mixing piles, thereby improving the quality of cement mixing pile construction and forming.

[0011] Optionally, the drill rod has a plurality of bosses extending radially on its outer side, and the plurality of bosses correspond one-to-one with the plurality of stirring blades; The boss has a cavity formed in the radial direction of the drill rod, and the cavity has an opening on the side of the boss away from the drill rod; the driven wheel is partially located inside the drill rod and partially located in the cavity; the stirring blade has a stirring part at the end away from the driven wheel, and the stirring part is located on the side of the boss away from the drill rod.

[0012] By adopting the above technical solution, the boss can provide protection for the gap between the driving wheel and the driven wheel, reducing the probability of cement and soil entering and affecting the normal use of the adjustment component.

[0013] Optionally, the stirring blade has a baffle between the stirring section and the driven wheel; The baffle is fitted against the side of the boss away from the drill rod, and the baffle remains to cover the opening of the cavity during the rotation of the stirring blade.

[0014] By adopting the above technical solution, the baffle can effectively prevent cement and soil from entering the cavity, thereby further reducing the probability of cement and soil entering and affecting the normal use of the regulating component.

[0015] Optionally, the drill rod has a plurality of corresponding collection troughs and a plurality of discharge ports inside, and the plurality of collection troughs correspond one-to-one with the plurality of stirring devices; The collecting trough is located below the driving wheel, and the top of the collecting trough is connected to the gap between the driving wheel and the driven wheel; one end of the discharge port is connected to the collecting trough and the other end passes through the drill rod to form an opening, and the end of the discharge port away from the collecting trough is controllable in opening and closing.

[0016] By adopting the above technical solution, cement and soil entering the gap between the driving wheel and the driven wheel can flow into the collection tank under their own gravity and be collected. At the same time, it is convenient for subsequent construction personnel to clean the materials in the collection tank, thereby effectively reducing the probability that cement and soil will remain in the gap for a long time and solidify, which will affect the normal use of the adjustment component.

[0017] Optionally, the stirring device further includes a cleaning component for cleaning the gap between the driving wheel and the driven wheel; The cleaning assembly is located inside the drill pipe and above the collection trough, and includes a movable part, a second drive part, and a cleaning component; The movable component is movably connected to the drill rod, and its direction of movement is parallel to the axis of the drill rod. The second driving component is used to drive the movable component to move. The cleaning component is disposed on the side of the movable component near the collection groove, and the projection of the cleaning component toward the collection groove falls within the gap between the driving wheel and the driven wheel.

[0018] By adopting the above technical solution, when cement and soil enter the gap between the driving wheel and the driven wheel, the control cleaning component can clean them, thereby ensuring the stability and reliability of the adjustment component.

[0019] Optionally, the cleaning component includes a plurality of soft, fixed bristles; During the movement of the movable component, the positions of both the driving wheel and the driven wheel near the meshing point remain in contact with the fixed bristles.

[0020] By adopting the above technical solution, during the process of adjusting the rotation of the stirring blades by the adjusting component, both the driving wheel and the driven wheel will come into contact with the fixed bristles, so that the fixed bristles can remove the mud and soil adhering to their surfaces, and the removed mud and soil will also enter the collection tank for collection under their own gravity.

[0021] Optionally, the cleaning component includes a plurality of stiff, movable bristles; The movable bristles are movably connected to the movable component, and their direction of movement is parallel to that of the movable component. The movable bristles also tend to move to their limit position in a direction away from the movable component. When the movable part moves to its limit position away from the drive wheel, the movable bristles maintain a distance from the drive wheel; when the movable part moves to its limit position closer to the drive wheel, the movable bristles pass through the gap at the meshing point of the drive wheel and the driven wheel, and the fixed bristle portion extends into the collection groove.

[0022] By adopting the above technical solution, the cleaning component can clean the gap between the driving wheel and the driven wheel through multiple movable bristles when the adjusting component does not rotate the mixing blades, thereby removing cement and soil from the gap.

[0023] Optionally, during the drilling process in step S5, the pile hole of the cement mixing pile is gradually formed by multiple mixing devices, and the forming effect of the multiple mixing devices on the pile hole gradually increases from bottom to top.

[0024] By adopting the above technical solutions, the difficulty of constructing cement mixing pile holes with varying radial dimensions can be reduced, and the probability of pile hole deformation or even collapse due to one-time construction during the construction process can be effectively reduced.

[0025] Optionally, after drilling is completed in step S5, during the process of the drill bit rising, multiple mixing devices reinforce the pile hole of the cement mixing pile again.

[0026] By adopting the above technical solutions, the shape stability of the cement mixing pile hole can be further consolidated, thereby further improving the quality of subsequent cement mixing pile construction.

[0027] In summary, this application includes at least one of the following beneficial effects: 1. It enables construction personnel to efficiently construct and shape cement mixing piles that match the reinforcement effect based on the distribution of silty clay in the coastal section; 2. It can effectively reduce the impact of cement and protrusions on the construction and forming of cement mixing piles, and improve the stability and reliability of construction personnel in adjusting the radial dimensions of cement mixing pile holes by adjusting the components; 3. It can improve the efficiency and effectiveness of cement mixing pile hole construction, thereby effectively improving the quality of the final cement mixing pile after construction. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the drill string structure in Example 1; Figure 2 This is a cross-sectional view of the drill string in Example 1; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the drill string structure in Example 2; Figure 5 This is a cross-sectional view of the drill string in Example 2; Figure 6 yes Figure 5 Enlarged view of point B in the middle; Figure 7 This is a partial structural diagram of the drill pipe interior in Example 2; Figure 8 This is a cross-sectional view of the drill pipe in Example 2.

[0029] Explanation of reference numerals in the attached drawings: 1. Drill rod; 11. Boss; 111. Cavity; 12. Collection trough; 13. Discharge port; 2. Agitator; 21. Agitator blade; 211. Agitator section; 212. Driven wheel; 213. Baffle; 22. Adjustment assembly; 221. Drive wheel; 222. First drive component; 23. Cleaning assembly; 231. Moving component; 232. Second drive component; 233. Cleaning component; 2331. Fixed bristles; 2332. Moving bristles; 234. Elastic component. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0031] Example 1: Reference Figure 1 and Figure 2 This application discloses a construction method for reinforcing silty clay subgrade in coastal sections, used for the efficient and high-quality construction of cement mixing piles with matching reinforcement effects on soft soil foundations containing silty clay in coastal sections. The method includes the following steps: S1, Detecting the foundation.

[0032] The foundation was surveyed using a detection instrument to obtain the distribution of different types of soil, such as silty clay and muddy clay, in the coastal section of the foundation. In this embodiment, since the detection instrument with the above-mentioned functions is existing technology in the field, it is not further limited here, nor is it described in detail.

[0033] S2. Based on the detection results, plan the preliminary shape of the cement mixing pile hole.

[0034] Based on the results of the foundation exploration, the distribution interval and number of cement mixing piles in the foundation construction were planned, as well as the radial dimensions of different cement mixing piles at different underground depths, resulting in the preliminary shape and distribution pattern of multiple cement mixing pile holes.

[0035] S3. Construct a corresponding digital model based on the structure and material of the drill bit.

[0036] Collect data on the structure (shape, size, etc.) and material of the drilling tools used, and use the collected data to create a digital model of the corresponding components for subsequent simulation.

[0037] S4. Combine the preliminary shape of the cement mixing pile hole with the digital model of the drilling tool to obtain the construction route and construction rules of the drilling tool in the foundation.

[0038] The preliminary shapes of multiple planned cement mixing pile holes are combined with the digital model of the drilling tools to simulate the construction route (construction depth, etc.) and construction rules (radial dimension variation rules of cement mixing pile holes, etc.) required for the construction of cement mixing piles using the drilling tools.

[0039] S5. Construct cement mixing piles according to the construction route and construction rules.

[0040] Based on the simulation results, the drilling tool was operated on the foundation to construct and form multiple required cement mixing piles in sequence.

[0041] Reference Figure 1 and Figure 2 The drilling equipment includes a drill rod 1 and multiple mixing devices 2 for cutting the soil and fully mixing the cement and soil.

[0042] The drill rod 1 has a drill bit structure at its bottom. Multiple stirring devices 2 are mounted on the drill rod 1 and located above the drill bit structure, with the stirring devices 2 evenly spaced along the axial direction of the drill rod 1. In this embodiment, the drill string preferably includes three stirring devices 2; in other embodiments, the number of stirring devices 2 may be increased or decreased depending on the actual situation.

[0043] Reference Figure 2 and Figure 3The stirring device 2 includes multiple stirring blades 21 with adjustable positions and an adjustment assembly 22 for adjusting the multiple stirring blades 21. In this embodiment, the stirring device 2 preferably includes two stirring blades 21, and the two stirring blades 21 are respectively installed on both sides of the same radial direction of the drill rod 1; and preferably, the two stirring blades 21 of adjacent stirring devices 2 are staggered along the axial direction of the drill rod 1.

[0044] The mixing blade 21 has a mixing part 211 for cutting soil and mixing cement and soil at both ends along its length, and a driven wheel 212 for forming a rotatable connection with the drill rod 1. The rotation axis of the mixing blade 21 and the drill rod 1 coincides with the axis of the driven wheel 212 and is parallel to the axis of the drill rod 1.

[0045] Multiple bosses 11 extend radially along the outer side of the drill rod 1, and each boss 11 corresponds to a multiple stirring blade 21. The inside of the boss 11 has a cavity 111, and the cavity 111 has an opening on the side of the boss 11 away from the drill rod 1. The end of the stirring blade 21 near the driven gear enters the cavity 111. The driven gear is located inside the drill rod 1 and meshes with the driving gear, and is also located in the cavity 111 and protected by the bosses 11.

[0046] The regulating assembly 22 includes a drive wheel 221 for driving the two stirring blades 21 to rotate synchronously and in the same direction, and a first drive member 222 for providing power to the drive wheel 221.

[0047] The drive wheel 221 has an overall annular structure and is rotatably mounted inside the drill rod 1. Its rotation axis coincides with its own axis and the axis of the drill rod 1. The first drive member 222 is fixedly mounted inside the drill rod 1 and is used to drive the drive wheel 221 to rotate relative to the drill rod 1. The outer sides of the drive wheel 221 and the outer sides of the driven wheel 212 are both distributed with teeth that mesh with each other, and the two stirring blades 21 are symmetrically distributed on the outer side of the drill rod 1 about the axis of the drill rod 1. In this embodiment, the first drive member 222 is preferably a servo motor, and the first drive member 222 is located above the drive wheel 221. The inner side of the drive wheel 221 is also preferably distributed with teeth, and the first drive member 222 drives the drive wheel 221 to rotate relative to the drill rod 1 through gears. Since servo motors are common existing technology, they will not be described in detail here, and only a brief representation is given in the accompanying drawings.

[0048] At this time, during the process of drilling the pile hole on the foundation, the control and adjustment component 22 can adjust the radial dimension of the drilled pile hole by synchronously and in the same direction rotating the two mixing blades 21.

[0049] In this embodiment, preferably, during the drilling process of forming the pile hole, when the three stirring devices 2 pass through the same height area of ​​the pile hole, the adjustment component 22 adjusts the rotation of the stirring blade 21 in the same way to improve the accuracy of the shape after the pile hole is formed.

[0050] Example 2: Reference Figure 4 and Figure 5 The difference between this embodiment and embodiment 1 lies in the drill rod 1 and the stirring device 2.

[0051] Reference Figure 4 and Figure 6 The stirring blade 21 also has a baffle 213 between the stirring part 211 and the driven gear to prevent cement and soil from entering the cavity 111, and the baffle 213 abuts against the side of the boss 11 away from the drill rod 1. In this embodiment, the baffle 213 is preferably an arc-shaped plate structure with the rotation axis of the stirring blade 21 as the axis, and the baffle 213 can completely cover the opening of the cavity 111; and preferably the bottom of the boss 11 has a wedge-shaped structure to facilitate drilling by the drill rod 1.

[0052] Reference Figure 7 and Figure 8 The adjustment component 22 drives the stirring blade 21 to rotate and adjust. During this process, the part of the stirring blade 21 located in the cavity 111 maintains a distance from the cavity wall of the cavity 111, and the baffle 213 keeps the opening of the cavity 111 completely covered.

[0053] Reference Figure 6 and Figure 7 Furthermore, during the mixing and blending of cement and soil by the mixing device 2, a small amount of cement and soil may still enter the cavity 111 through the gap between the baffle 213 and the boss 11. If the cement and soil entering the cavity 111 move to the gap between the driving wheel 221 and the driven wheel 212, it will affect the adjustment effect of the adjustment component 22 on the rotation of the mixing blade 21. Therefore, the drill rod 1 is also provided with multiple collection troughs 12 for collecting the cement and soil entering the drill rod 1. The mixing device 2 also includes a cleaning component 23 for cleaning the cement and soil.

[0054] Multiple collection troughs 12 correspond one-to-one with multiple mixing devices 2, located below the corresponding mixing device 2, and their tops communicate with the gap between the driving wheel 221 and the driven wheel 212. Cement and soil moving into the gap between the driving wheel 221 and the driven wheel 212 can fall into the collection trough 12 under their own gravity, thus reducing the amount of cement and soil remaining in the gap. In this embodiment, preferably, the top of the collection trough 12 is flared near the gap between the driving wheel 221 and the driven wheel 212, allowing cement and soil to enter the collection trough 12 along the slope.

[0055] Furthermore, to facilitate the cleaning of cement and soil in the collection trough 12 by construction personnel after the drilling tools are used, the drill rod 1 is also provided with multiple discharge ports 13 corresponding to the multiple collection troughs 12.

[0056] Reference Figure 4 and Figure 6 One end of the discharge port 13 is connected to the bottom of the collection trough 12, and the other end passes through the outside of the drill rod 1 to form an opening. The drill rod 1 is detachably connected to the opening of the discharge port 13 with a structure for controlling the opening and closing of the discharge port 13. In this embodiment, it is preferable that the opening direction of the discharge port 13 is inclined downward relative to the axis of the drill rod 1, so as to facilitate the discharge of cement and soil in the collection trough 12 through the discharge port 13; and preferably, the structure for controlling the opening and closing of the discharge port 13 is detachably connected to the drill rod 1 through a threaded engagement, and after connection, it is flush with the surface of the drill rod 1.

[0057] Reference Figure 6 and Figure 7 The cleaning component 23 is installed inside the drill rod 1 and above the drive wheel 221. It includes a movable part 231, a second drive part 232, and a cleaning component 233 for cleaning cement and soil.

[0058] The movable component 231 has an overall ring-shaped structure and is movably connected to the drill rod 1. Its direction of movement is parallel to its own axis, and its axis remains coincident with the axis of the drill rod 1 during movement. The second driving component 232 is fixedly installed inside the drill rod 1, located above the movable component 231, and is used to drive the movable component 231 to move relative to the drill rod 1. The cleaning component 233 is installed on the side of the movable component 231 away from the second driving component 232 and is distributed in the movable component 231 near the gap between the driving wheel 221 and the driven wheel 212. In this embodiment, the second driving component 232 is preferably a servo cylinder; since servo cylinders are common prior art, they will not be described in detail here, and are only briefly shown in the accompanying drawings.

[0059] Reference Figure 7 and Figure 8The cleaning component 233 includes a plurality of soft, fixed bristles 2331 and a plurality of hard, movable bristles 2332. The fixed bristles 2331 are used to clean cement and soil adhering to the surfaces of the driving wheel 221 and the driven wheel 212 near the gap between them, and the movable bristles 2332 are used to clean cement and soil in the gap between the driving wheel 221 and the driven wheel 212 at the meshing point. In this embodiment, it is preferable that the plurality of movable bristles 2332 are concentrated in one area, and the plurality of fixed bristles 2331 are distributed on both sides of the distribution area of ​​the movable bristles 2332.

[0060] The movable bristles 2332 are cylindrical in shape and are movably connected to the movable component 231. Their direction of movement is parallel to both their own axis and the direction of movement of the movable component 231. The movable component 231 contains multiple elastic elements 234, each corresponding to one of the movable bristles 2332. These elastic elements 234 tend to drive the movable bristles 2332 to their limit positions in a direction away from the movable component 231. In this embodiment, the elastic element 234 is preferably a compression spring.

[0061] The second driving member 232 restricts the movement of the movable member 231 relative to the drill pipe 1. When the movable member 231 moves to its limit position away from the driving wheel 221, the end of the fixed bristle 2331 is located on the side of the meshing point of the driving wheel 221 and the driven wheel 212, allowing the driving wheel 221 and the driven wheel 212 to contact it during rotation. At this time, the movable bristle 2332 remains in the state of moving to its limit position towards the driving wheel 221, and it maintains a distance from the meshing point of the driving wheel 221 and the driven wheel 212. When the movable member 231 moves to its limit position towards the driving wheel 221, the root of the fixed bristle 2331 is located on the side of the meshing point of the driving wheel 221 and the driven wheel 212, allowing the driving wheel 221 and the driven wheel 212 to contact it during rotation. 2. During rotation, the bristles 2331 will bend and deform at the end and enter the flared space at the top of the collection trough 12 to prevent cement and soil from forming a blockage. At this time, some of the movable bristles 2332 will remain in the position of moving away from the movable part 231 and enter the gap between the drive wheel 221 and the driven wheel 212 to clean the cement and soil that remain there. The remaining movable bristles 2332 will overcome the force of the elastic part 234 and move away from the drive wheel 221 relative to the movable part 231 to the position of moving away from the drive wheel 221 due to the obstruction of the drive wheel 221 or the driven wheel 212.

[0062] During the process of the movable bristles 2332 penetrating the gap between the drive wheel 221 and the driven wheel 212, if the cement and soil cannot be easily cleaned, the movable bristles 2332 will overcome the elastic member 234 and move away from the drive wheel 221 to a certain extent relative to the movable member 231. At this time, the compressed elastic member 234 will drive the movable bristles 2332 to apply force to the cement and soil, causing them to move towards the collection and cleaning direction to complete the cleaning.

[0063] At this time, the adjustment component 22 needs to use the rotation adjustment of the stirring blade 21. During this process, the second drive component 232 drives the movable component 231 to move to its limit position in the direction away from the drive wheel 221. This allows only the fixed bristles 2331 in the cleaning component 233 to clean the cement and soil in the gap between the drive wheel 221 and the driven wheel 212, reducing the influence of the movable bristles 2332 on the rotation adjustment of the stirring blade 21 by the adjustment component 22.

[0064] When the adjusting component 22 does not need to rotate the stirring blade 21, the second driving component 232 drives the movable component 231 to move towards the extreme position of the driving wheel 221. During this process, multiple fixed bristles 2331 can clean the cement and soil adhering to the surface of the driving wheel 221 and the driven wheel 212, and at the same time clear the blockage in the flared interior of the collection tank 12. Multiple movable bristles 2332 can clean the cement and soil in the gap at the meshing point of the driving wheel 221 and the driven wheel 212. After cleaning, the second driving component 232 drives the movable component 231 to reset, so that the adjusting component 22 is in a state that can be operated at any time.

[0065] Example 3: Reference Figure 1 and Figure 2 The difference between this embodiment and embodiment 1 is that during the drilling process of forming the pile hole, the adjustment components 22 of the three mixing devices 2 have different rotation adjustment rules for the mixing blades 21.

[0066] As the drill bit moves downwards to complete the construction and shaping of the pile hole, the three mixing devices 2 will sequentially and gradually shape the areas where the radial dimensions of the pile hole change. The mixing device 2 at the bottom performs preliminary shaping of this area, the mixing device 2 in the middle performs further shaping of this area, and the mixing device 2 at the top performs final shaping of this area.

[0067] In this process, multiple construction moldings can effectively reduce the impact of the radial dimension change in the pile hole area when the mixing device 2 is constructing the pile hole on the already constructed part above the pile hole. This can effectively ensure the shape stability of the pile hole during the construction molding process and reduce the probability of deformation or even collapse of the top of the pile hole due to the construction molding at the bottom of the pile hole.

[0068] Furthermore, to further consolidate the shape stability after the pile hole is formed, it is preferred that during the process of the drilling tool moving upward to complete the full mixing and fusion of cement and soil, the three mixing devices 2 have the same rotation adjustment law for the mixing blades 21 when passing through the same height area of ​​the pile hole. This ensures that the mixing part 211 of the mixing blades 21 can maintain contact with the inner wall of the pile hole during this process, thereby improving the shape stability of the pile hole during the mixing and fusion of cement and soil.

[0069] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction method for reinforcing silty clay subgrade in coastal sections, characterized in that, Includes the following steps: S1, Detecting the foundation; S2. Based on the detection results, plan the preliminary shape of the cement mixing pile hole; S3. Construct a corresponding digital model based on the structure and material of the drill bit; S4. Combine the preliminary shape of the cement mixing pile hole with the digital model of the drilling tool to obtain the construction route and construction rules of the drilling tool in the foundation. S5. Construct and shape cement mixing piles according to the construction route and construction rules; Among them, the radial dimensions of the cement mixing piles at different locations are different after the cement mixing piles are constructed and formed, and the drilling tools include drill rods (1) and multiple mixing devices (2). Multiple stirring devices (2) are distributed at intervals along the axial direction of the drill rod (1) on the drill rod (1), and each stirring device (2) includes multiple adjustable stirring blades (21) and an adjustment assembly (22) for adjusting the multiple stirring blades (21). One end of the stirring blade (21) is rotatably connected to the drill rod (1), and its rotation axis is parallel to the axis of the drill rod (1). The adjustment component (22) is located inside the drill rod (1).

2. The construction method for reinforcing silty clay subgrade in coastal sections according to claim 1, characterized in that, The adjustment assembly (22) includes a drive wheel (221) and a first drive member (222); The drive wheel (221) is rotatably connected to the drill rod (1), and its rotation axis coincides with its own axis and the axis of the drill rod (1). The first drive member (222) is used to drive the drive wheel (221) to rotate. The stirring blade (21) has a driven wheel (212) at one end near the drill rod (1). The driven wheel (212) meshes with the driving wheel (221), and the axis of the driven wheel (212) coincides with the rotation axis of the stirring blade (21).

3. The construction method for reinforcing silty clay subgrade in coastal sections according to claim 2, characterized in that, The drill rod (1) has multiple bosses (11) extending radially on its outer side, and each of the multiple bosses (11) corresponds to a multiple of the stirring blades (21). The boss (11) has a cavity (111) formed inside it along the radial direction of the drill rod (1), and the cavity (111) forms an opening on the side of the boss (11) away from the drill rod (1); the driven wheel (212) is partially located inside the drill rod (1) and partially located in the cavity (111); the stirring blade (21) has a stirring part (211) at the end away from the driven wheel (212), and the stirring part (211) is located on the side of the boss (11) away from the drill rod (1).

4. The construction method for reinforcing silty clay subgrade in coastal sections according to claim 3, characterized in that, The stirring blade (21) has a baffle (213) between the stirring part (211) and the driven wheel (212). The baffle (213) abuts against the side of the boss (11) away from the drill rod (1), and the baffle (213) keeps the opening of the cavity (111) sealed during the rotation of the stirring blade (21).

5. The construction method for reinforcing silty clay subgrade in coastal sections according to claim 2, characterized in that, The drill rod (1) has a plurality of corresponding collection troughs (12) and a plurality of discharge ports (13) inside, and the plurality of collection troughs (12) correspond one-to-one with the plurality of stirring devices (2); The collecting trough (12) is located below the driving wheel (221), and the top of the collecting trough (12) is connected to the gap between the driving wheel (221) and the driven wheel (212); one end of the discharge port (13) is connected to the collecting trough (12) and the other end passes through the drill rod (1) to form an opening, and the end of the discharge port (13) away from the collecting trough (12) is controllable in opening and closing.

6. The construction method for reinforcing silty clay subgrade in coastal sections according to claim 5, characterized in that, The stirring device (2) also includes a cleaning component (23) for cleaning the gap between the driving wheel (221) and the driven wheel (212). The cleaning component (23) is located inside the drill rod (1) and above the collection groove (12), and includes a movable part (231), a second drive part (232) and a cleaning component (233). The movable part (231) is movably connected to the drill rod (1), and its direction of movement is parallel to the axis of the drill rod (1). The second driving part (232) is used to drive the movable part (231) to move. The cleaning part (233) is disposed on the side of the movable part (231) near the collection groove (12), and the projection of the cleaning part (233) toward the direction near the collection groove (12) falls onto the driving wheel (221) within the gap range between the driven wheels (212).

7. The construction method for reinforcing silty clay subgrade in coastal sections according to claim 6, characterized in that, The cleaning component (233) includes a plurality of soft, fixed bristles (2331). During the movement of the movable part (231), the position of the driving wheel (221) and the driven wheel (212) near the meshing point are in contact with the fixed bristles (2331).

8. The construction method for reinforcing silty clay subgrade in coastal sections according to claim 7, characterized in that, The cleaning component (233) includes a plurality of stiff, movable bristles (2332); The movable bristles (2332) are movably connected to the movable component (231), and their movement direction is parallel to the movement direction of the movable component (231). The movable bristles (2332) tend to move to their limit position in a direction away from the movable component (231). When the movable part (231) moves to its limit position away from the driving wheel (221), the movable bristles (2332) maintain a distance from the driving wheel (221); when the movable part (231) moves to its limit position towards the driving wheel (221), the movable bristles (2332) pass through the gap at the meshing point of the driving wheel (221) and the driven wheel (212), and the fixed bristles (2331) partially extend into the collection groove (12).

9. A construction method for reinforcing silty clay subgrade in coastal sections according to claim 1, characterized in that, During the drilling process in step S5, the pile hole of the cement mixing pile is gradually formed by multiple mixing devices (2), and the forming effect of the multiple mixing devices (2) on the pile hole gradually increases from bottom to top.

10. A construction method for reinforcing silty clay subgrade in coastal sections according to claim 9, characterized in that, After drilling is completed in step S5, during the process of the drill bit rising, multiple mixing devices (2) reinforce the pile hole of the cement mixing pile again.

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