Deep foundation pit suspension type stirring pile construction device and method based on BIM

Abstract

The invention relates to the technical field of mixing pile construction, and discloses a BIM-based deep foundation pit suspension type mixing pile construction device and method.The BIM-based deep foundation pit suspension type mixing pile construction device comprises a rack and a driving machine arranged at the top of the rack, and further comprises a drilling assembly arranged at the output end of the driving machine and a lifting assembly arranged on the driving machine; the stirring blades are annularly arranged on the side wall, close to the bottom, of the drilling assembly at equal intervals, and the smearing assembly and the mixing assembly are sequentially arranged on the side wall of the drilling assembly in the vertical direction. The layered mixing design is adopted, the movable assembly is arranged to inject bottom mortar, the mortar spraying position is changed after the movable assembly submerges the smearing assembly, then the effect of mixing through layered spraying is achieved, soil and mortar are evenly mixed in the mixing process through the layered mixing design, the number of times of multiple times of mixing is reduced, and therefore the construction period of the mixing pile is shortened.

Description

Technical Field

[0001] This invention relates to the field of mixing pile construction technology, and in particular to a BIM-based deep foundation pit suspended mixing pile construction device and method. Background Technology

[0002] Mixing piles are a foundation treatment technology that uses specialized machinery to forcibly mix soft soil (such as silt, silty clay, silty clay, etc.) with a solidifying agent (cement, lime, fly ash, etc.), causing the soft soil to solidify into a columnar solidified body with a certain strength. This improves the bearing capacity of the foundation or plays a role in seepage prevention and support. It is often used in soft soil foundation reinforcement (such as road, bridge, and building foundations), foundation pit seepage prevention curtains, slope support, and other engineering scenarios.

[0003] However, existing technologies still have the following drawbacks: 1. In the construction of mixing piles in complex strata such as soft soil and sand, existing technologies mostly adopt a single grouting channel and mixing path (grouting only at the bottom or grouting along the entire length). The mixing of mortar and soil depends on the single rotation of the mixing blade. The soil is prone to local agglomeration or mortar enrichment, resulting in uneven mixing (such as insufficient mortar in the central area and insufficient soil fragmentation in the edge area). To compensate for this defect, it is necessary to improve the mixing effect by repeatedly lowering and raising the piles multiple times. This not only increases mechanical wear but also prolongs the construction period of a single pile.

[0004] 2. In the existing equipment, during the lifting and mixing stage after drilling, there is a lack of pre-reinforcement measures for the borehole wall. In soft soil or sand layers, the unmixed loose soil is prone to collapse due to the disturbance of the mixing blades, resulting in a smaller pile diameter or pile breakage. Furthermore, after the pile body is formed, the outer wall is also prone to unevenness, which can lead to stress concentration points. Summary of the Invention

[0005] Given the problems of insufficient mixing requiring multiple stirrings and the impact of inner wall collapse on the structural strength of the mixing pile in existing technologies, a BIM-based suspended mixing pile construction device for deep foundation pits is proposed.

[0006] The purpose is to increase the degree of mixing to solve the problem of local agglomeration or mortar enrichment in the soil, prevent uneven mixing, reduce the number of mixing times, and shorten the construction period of the mixing pile. At the same time, for the problem of easy collapse of the inner wall of the hole in soft soil, a coating component is set up to coat the hole wall before large-area mixing to form a reinforcement layer, thereby strengthening the hole wall and making it difficult for the outer wall of the formed mixing column to be uneven, thus ensuring the support strength of the mixing pile after it is formed.

[0007] The technical solution of the present invention is a BIM-based deep foundation pit suspended mixing pile construction device, including a frame, a drive motor set on the top of the frame, a drilling assembly set on the output end of the drive motor, a lifting assembly set on the drive motor, multiple mixing blades arranged in a ring at equal intervals on the side wall of the drilling assembly near the bottom, and a smearing assembly and a mixing assembly arranged in sequence along the vertical direction on the side wall of the drilling assembly, wherein the mixing assembly is located above the mixing blades; The drilling assembly includes a drilling pipe disposed on the output end of the drive motor, a connecting pipe fixedly disposed on the inner wall of the drilling pipe, a movable component slidably disposed on the inner wall of the connecting pipe, a slurry conveying component disposed on the inner wall of the movable component, a drill bit assembly disposed at the bottom of the drilling pipe, an air groove block disposed near the bottom of the connecting pipe, and a lifting pipe disposed at the top of the movable component. The movable components include a sliding tube 321 slidably disposed on the wall of the connecting pipe, with the outer wall of the top of the sliding tube 321 fixedly connected to the outer wall of the bottom of the lifting pipe 36, a ventilation slot opened on the side wall of the sliding tube, a gate plate disposed in the middle of the sliding tube, multiple rectangular through slots evenly and equidistantly opened in the middle of the gate plate in the vertical direction, a cross connecting ring disposed at the bottom of the sliding tube, a fixed pipe disposed at the bottom of the side wall of the cross connecting ring, a connecting pipe disposed at the top of the fixed pipe, and multiple slurry holes equidistantly opened in a ring on the connecting pipe near the top of the pipe wall.

[0008] Furthermore, the grout delivery assembly includes a grout inlet pipe rotatably disposed on the inner wall of the sliding pipe, a limiting ring sealed and fixedly disposed on the inner wall of the grout inlet pipe near the bottom, a rotating pipe disposed on the inner wall of the limiting ring, and a grout passage pipe disposed on the inner wall of the rotating pipe, wherein the outer wall of the grout passage pipe is fixedly connected to the inner wall of the connecting pipe.

[0009] Furthermore, the drill bit assembly includes a drill head disposed on the outer wall of the bottom of the drill pipe, multiple slurry outlet holes opened inside the drill head, an air pressure balance slot opened inside the drill head, a limiting tube fixedly disposed on the inner wall of the drill head, multiple limiting grooves opened inside the limiting tube, and a flow channel tube fixedly disposed on the top of the limiting tube, wherein the side wall of the top of the flow channel tube is fixedly connected to the inner wall of the bottom of the rotating pipe.

[0010] Furthermore, the mixing assembly includes an extrusion blade disposed on the side wall of the drill pipe, a flow divider disposed on the inner wall of the extrusion blade, a combing groove formed on the bottom outer wall of the flow divider, and an auxiliary plate disposed on the side wall of the extrusion blade.

[0011] Furthermore, the coating assembly includes a V-shaped blade disposed on the side wall of the drill pipe, a guide box disposed on the top of the V-shaped blade, a connecting sleeve disposed on the side wall of the guide box, wherein the inner wall of the connecting sleeve is fixedly connected to the outer wall of the grout pipe, a coating plate disposed on the side wall of the V-shaped blade, a grout outlet groove opened on the coating plate, and an auxiliary port opened on the coating plate.

[0012] Furthermore, the lifting assembly includes an air pump disposed on the outer wall of the top of the drive unit, a cylinder disposed at the output end of the air pump via a pipe, a lifting plate disposed on the top of the cylinder, and a limiting rod disposed on the inner wall of the lifting plate, wherein the outer wall of the bottom of the limiting rod and the outer wall of the bottom of the cylinder are both fixedly connected to the outer wall of the top of the drive unit.

[0013] Another objective of this invention is to provide a BIM-based method for constructing suspended mixing piles in deep foundation pits. The purpose of this method is to ensure that the soil and mortar are mixed evenly during the mixing process, reducing the number of mixing operations and thus shortening the construction period of the mixing piles. At the same time, it avoids the defects of local under-mixing in traditional mixing piles during the mixing process, ensuring the smoothness of the outer wall of the formed mixing pile, reducing stress accumulation, and thus ensuring the strength of the formed mixing pile.

[0014] To achieve the above objectives, the present invention provides the following technical solution, comprising the following steps: S1. The drive motor drives the drilling assembly to rotate and descend along the frame to drill. At this time, no mortar is injected into the grout pipe. During the drilling process, except for the grout pipe and the limit ring, all other components rotate synchronously with the drilling pipe under the drive of the drive motor. After S2 drilling is completed, the lifting assembly is activated to raise the movable assembly, so that the connecting pipe and the flow channel pipe are connected. The grout is injected into the grout inlet pipe and then injected from the bottom of the hole through the grout outlet hole until the grout injected into the hole is higher than the coating assembly as shown by BIM calculation. Then the support of the lifting assembly is stopped. S3. The lifting component descends, causing the movable component to move down, switching to grouting through the grout pipe. The drive machine drives the drilling component to rotate and rise. The coating component pre-coats the inner wall of the hole, while the mixing component enhances the mixing of mud and slurry in the hole, forming a mixed mud column with the stirring blade.

[0015] Furthermore, when the lifting assembly descends and changes the spraying position of the construction organization, the height of the drive motor is simultaneously raised.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. A layered mixing design is adopted. By setting up an active component to inject mortar at the bottom and then changing the mortar spraying position after it has submerged the coating component, the effect of layered spraying and mixing is achieved. The layered mixing design ensures that the soil and mortar are mixed evenly during the mixing process, reducing the number of mixing times and thus shortening the construction period of the mixing pile.

[0017] 2. The pre-coating function of the coating component forms an early reinforcement layer on the borehole wall. Combined with the auxiliary coating effect of the mixing component, the reinforcement effect is enhanced, thereby reducing the risk of borehole wall collapse during the lifting stage. It is especially suitable for soft soil and sandy soil. The coating component pre-mixes during the mixing process, while the mixing component enhances the mixing effect during the mixing process. With the setting of the mixing blade, the mortar and soil are more fully integrated. This avoids the defect of local under-mixing in traditional mixing piles, while ensuring the smoothness of the outer wall of the formed mixing pile, reducing stress accumulation, and thus ensuring the strength of the mixing pile.

[0018] 3. The movable components have small sliding deviations due to the cooperation between the cross connecting ring and the limiting groove, and the grouting hole and the flow channel pipe are accurately connected. This makes it difficult for the grouting interruption caused by switching jams during the construction process, thus ensuring the orderly progress of the mixing process. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the entire invention; Figure 2 This is a partial structural diagram of the drilling assembly of the present invention; Figure 3 This is a cross-sectional view of the drilling assembly of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is an exploded view of the drilling assembly of the present invention; Figure 6 This is a cross-sectional structural diagram of the active component of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 8 This is a cross-sectional view of the slurry delivery assembly of the present invention; Figure 9 This is a cross-sectional view of the drill bit assembly of the present invention; Figure 10 This is a cross-sectional view of the air groove block of the present invention; Figure 11 This is a cross-sectional view of the lifting tube of the present invention; Figure 12 This is a cross-sectional view of the connecting pipe of the present invention; Figure 13 This is a schematic diagram of the overall structure of the hybrid component of the present invention; Figure 14 This is a schematic diagram of the overall structure of the application component of the present invention; Figure 15 This is a schematic diagram of the overall structure of the lifting assembly of the present invention.

[0020] In the picture: 1. Frame; 2. Drive motor; 3. Drilling assembly; 31. Drilling pipe; 32. Movable assembly; 33. Grouting assembly; 34. Drill bit assembly; 35. Air groove block; 36. Lifting pipe; 37. Connecting pipe; 321. Sliding pipe; 322. Air vent; 323. Gate; 324. Through slot rectangular opening; 325. Cross connecting ring; 326. Fixed pipe; 327. Connecting pipe; 328. Grouting hole; 331. Grout inlet pipe; 332. Limiting ring; 333. Rotating pipe; 334. Grouting pipe; 34. 1. Drill head; 342. Slurry outlet; 343. Limiting tube; 344. Limiting groove; 345. Flow channel tube; 346. Air pressure balance groove; 4. Stirring blade; 5. Mixing assembly; 51. Extrusion blade; 52. Diverter plate; 53. Combing groove; 54. Auxiliary plate; 6. Coating assembly; 61. V-shaped blade; 62. Guide box; 63. Connecting sleeve; 64. Coating plate; 65. Slurry outlet groove; 66. Auxiliary port; 7. Lifting assembly; 71. Air pump; 72. Cylinder; 73. Lifting plate; 74. Limiting rod. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Example 1, referring to Figure 1 - Figure 12 and Figure 15This is the first embodiment of the present invention, providing a BIM-based deep foundation pit suspended mixing pile construction device, including a frame 1, a drive motor 2 slidably connected to the top of the frame 1 via a screw, a drilling assembly 3 fixedly connected to the output end of the drive motor 2, a lifting assembly 7 fixedly connected to the drive motor 2, multiple mixing blades 4 equidistantly fixedly connected in a ring to the side wall near the bottom of the drilling assembly 3, and a spreading assembly 6 and a mixing assembly 5 sequentially fixedly connected to the side wall of the drilling assembly 3 in a vertical direction, with the mixing assembly 5 located above the mixing blades 4; the drilling assembly 3 includes a drilling pipe 31 fixedly connected to the output end of the drive motor 2, a connecting pipe 37 fixedly connected to the inner wall of the drilling pipe 31, a movable assembly 32 slidably connected to the inner wall of the connecting pipe 37, a grouting assembly 33 slidably connected to the inner wall of the movable assembly 32, and a fixed assembly at the bottom of the drilling pipe 31. The assembly includes a drill bit assembly 34 and an air groove block 35 fixedly connected to the bottom of the connecting pipe 37, and a lifting pipe 36 fixedly connected to the top of the movable assembly 32. The movable assembly 32 includes a sliding pipe 321 slidably connected to the wall of the connecting pipe 37, with the outer wall of the top of the sliding pipe 321 fixedly connected to the outer wall of the bottom of the lifting pipe 36, an air vent 322 opened on the side wall of the sliding pipe 321, a gate 323 fixedly connected to the middle of the sliding pipe 321, a plurality of rectangular through slots 324 evenly and equidistantly opened in the middle of the gate 323 in the vertical direction, a cross connecting ring 325 fixedly connected to the bottom of the sliding pipe 321, a fixed pipe 326 fixedly connected to the bottom of the side wall of the cross connecting ring 325, a connecting pipe 327 fixedly connected to the top of the fixed pipe 326, and a plurality of slurry holes 328 opened in a ring and equidistantly on the top wall of the connecting pipe 327.

[0023] Specifically, the frame 1 drives the drive motor 2 to move downward as a whole through the threaded rod. The output torque of the drive motor 2 drives the drilling pipe 31 of the drilling assembly 3 to rotate. The drill bit assembly 34 (drill head 341) at the bottom of the drilling pipe 31 cuts into the stratum as it rotates. Its outer wall cutting edge breaks the soil. After drilling to the design depth required for construction, the lifting assembly 7 is activated: the air pump 71 drives the cylinder 72 to extend, which drives the lifting plate 73 to move upward along the limit rod 74. The lifting plate 73 pushes the sliding pipe 321 of the movable assembly 32 to slide upward between the connecting pipe 37 and the grouting assembly 33 through the lifting pipe 36. When the sliding pipe 321 moves upward, the gate plate 323 moves upward synchronously and slides in the grouting pipe 334, thereby removing the through slot rectangular opening 324, so that the lateral channel is closed, and mortar is filled from the bottom of the hole. The bottom is gradually filled with mortar to ensure the structural strength of the bottom mixing column after it is formed.

[0024] Reference Figure 1 - Figure 8The grout delivery assembly 33 includes a grout inlet pipe 331 rotatably connected to the inner wall of the sliding pipe 321, a limiting ring 332 sealed and fixedly connected to the inner wall of the grout inlet pipe 331 near the bottom, a rotating pipe 333 rotatably connected to the inner wall of the limiting ring 332, and a grout passage pipe 334 fixedly connected to the inner wall of the rotating pipe 333, with the outer wall of the grout passage pipe 334 fixedly connected to the inner wall of the connecting pipe 37.

[0025] Specifically, mortar is injected into the grout inlet pipe 331 and sprayed out from the grout outlet hole 342 through the rotating pipe 333, connecting pipe 327, and fixed pipe 326, filling the bottom of the hole. The BIM model calculates the grouting volume in real time. When the grout level is higher than the coating component 6, the cylinder 72 contracts, causing the lifting plate 73 to move down, and the sliding pipe 321 descends accordingly. The through slot rectangular opening 324 of the gate 323 aligns with the grout inlet pipe 334 (opening the lateral channel), and the connecting pipe 327 disengages from the flow channel pipe 345 (closing the bottom grout outlet), thereby spraying grout from the side to assist in layered mixing.

[0026] Reference Figure 1 - Figure 9 The drill bit assembly 34 includes a drill head 341 fixedly connected to the bottom outer wall of the drill pipe 31, multiple slurry outlet holes 342 opened inside the drill head 341, an air pressure balance slot 346 opened inside the drill head 341, a limiting tube 343 fixedly connected to the inner wall of the drill head 341, multiple limiting grooves 344 opened inside the limiting tube 343, and a flow channel tube 345 fixedly connected to the top of the limiting tube 343, wherein the side wall of the top of the flow channel tube 345 is fixedly connected to the inner wall of the bottom of the rotating tube 333.

[0027] Specifically, when the lifting assembly 7 moves, the cross connecting ring 325 moves upward along the limiting groove 344 of the limiting tube 343, driving the fixed tube 326 and the connecting tube 327 to rise. The fixed tube 326 disengages from the slot of the drill head 341, and the connecting tube 327 is inserted into the flow channel tube 345. Its grouting hole 328 is aligned with the internal flow channel of the flow channel tube 345, forming a passage from the rotating tube 333 to the grouting hole 342. At this time, mortar is injected into the grouting pipe 331 and sprayed out from the grouting hole 342 through the rotating tube 333, the connecting tube 327, and the fixed tube 326, filling the bottom of the hole and ensuring the complete grouting at the bottom, thereby ensuring the bearing strength of the bottom of the mixing pile.

[0028] Reference Figure 1 - Figure 15 The lifting assembly 7 includes an air pump 71 disposed on the top outer wall of the drive unit 2, a cylinder 72 fixedly connected to the output end of the air pump 71 via a pipe, a lifting plate 73 fixedly connected to the top of the cylinder 72, and a limiting rod 74 slidably connected to the inner wall of the lifting plate 73. The outer wall of the bottom of the limiting rod 74 and the outer wall of the bottom of the cylinder 72 are both fixedly connected to the outer wall of the top of the drive unit 2.

[0029] Specifically, the BIM model calculates the grouting volume in real time, while the lifting component controls the position of the movable component 32, thereby controlling the position of the mortar nozzle. During bottom grouting, the lifting component 7 controls the movable component 32 to rise. When the grout level is detected to be higher than the coating component 6, a stop signal is sent to the lifting component 7. After receiving the BIM signal, the lifting component 7 reverses its action, closing the bottom grouting port while opening the grouting nozzle on the side surface to assist in switching the grouting position.

[0030] Example 2, refer to Figure 1 - Figure 15 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the mixing component 5 includes an extrusion blade 51 fixedly connected to the side wall of the drilling tube 31, a flow divider 52 fixedly connected to the inner wall of the extrusion blade 51, a combing groove 53 opened on the bottom outer wall of the flow divider 52, and an auxiliary plate 54 fixedly connected to the side wall of the extrusion blade 51.

[0031] Specifically, the extrusion blade 51 pushes the soil towards the center, the combing groove 53 of the diversion plate 52 divides the soil to form voids, the high-pressure mortar penetrates and mixes, the auxiliary plate 54 further presses the mixed mud against the hole wall, reinforces the pre-coating layer and buffers the impact, and the mixing blade 4 finally cuts and mixes, so that the mortar and soil are evenly integrated from the inside to the outside.

[0032] Reference Figure 1 - Figure 13 The coating assembly 6 includes a V-shaped blade 61 fixedly connected to the side wall of the drill pipe 31, a guide box 62 fixedly connected to the top of the V-shaped blade 61, a connecting sleeve 63 fixedly connected to the side wall of the guide box 62, and the inner wall of the connecting sleeve 63 is fixedly connected to the outer wall of the slurry pipe 334, a coating plate 64 fixedly connected to the side wall of the V-shaped blade 61, a slurry outlet groove 65 opened on the coating plate 64, and an auxiliary port 66 opened on the coating plate 64.

[0033] Specifically, high-pressure mortar is sprayed into the guide box 62 through the connecting sleeve 63. The V-shaped blade 61 gathers the unmixed soil towards the center. The arc-shaped inner wall of the guide box 62 guides the mortar to impact the soil and form mixed mud. Under the action of centrifugal force and the inclined surface of the guide box 62, the mixed mud flows to the coating plate 64. After overflowing from the slurry outlet 65, it is pressed onto the hole wall to form a pre-reinforcement layer. Excess mixed mud is discharged from the auxiliary port 66 to assist in the application of the reinforcement layer. The rest of the structure is the same as that of Example 1.

[0034] Based on embodiments 1-2, the working principle of this invention is as follows: The frame 1 drives the drive motor 2 to move downwards as a whole via a threaded rod. The drive motor 2 outputs torque to rotate the drilling pipe 31 of the drilling assembly 3. The drill bit assembly 34 (drill head 341) at the bottom of the drilling pipe 31 rotates and cuts into the stratum. Its outer wall cutting edge breaks the soil. At the same time, the stirring blade 4, mixing assembly 5 (extrusion blade 51, flow divider 52), and coating assembly 6 (V-shaped blade 61, coating plate 64) on the side wall of the drilling pipe 31 rotate synchronously, pushing the broken soil to both sides of the hole wall to expand the hole. During this stage, the grout inlet pipe 331 and the internal limiting ring 332 of the grout delivery assembly 33 only follow the drive. Machine 2 moves down and remains stationary (no grouting for the time being). Rotating pipe 333 rotates with drilling pipe 31 under the constraint of limiting ring 332. Movable component 32 (sliding pipe 321) is in the initial low position. The bottom of fixed pipe 326 is in grooved contact with the inner wall of drilling head 341 (closing grout outlet 342). Air groove block 35 balances the air pressure between movable components 32 through air pressure balance groove 346 to avoid the air pressure difference generated by rotation from hindering subsequent sliding. Similarly, the setting of air vent 322 allows the air pressure to be balanced when sliding pipe 321 and grout inlet pipe 331 of movable component 32 slide relative to each other, preventing excessive changes in internal air pressure from making sliding difficult.

[0035] After drilling to the required design depth, the lifting assembly 7 is activated: the air pump 71 drives the cylinder 72 to extend, causing the lifting plate 73 to move upward along the limiting rod 74. The lifting plate 73, through the lifting pipe 36, pushes the sliding pipe 321 of the movable assembly 32 to slide upward between the connecting pipe 37 and the grouting assembly 33. When the sliding pipe 321 moves upward, the gate 323 moves upward simultaneously and slides within the grouting pipe 334, thereby removing the rectangular opening 324 of the through slot, closing the lateral channel. The cross connecting ring 325 moves upward along the limiting groove 344 of the limiting pipe 343, driving the fixed... The fixed pipe 326 and the connecting pipe 327 rise, the fixed pipe 326 disengages from the drill head 341 slot, and the connecting pipe 327 is inserted into the flow channel pipe 345. Its grouting hole 328 is aligned with the internal flow channel of the flow channel pipe 345, forming a passage from the rotating pipe 333 to the grouting hole 342. At this time, grout is injected into the grouting pipe 331 and sprayed out from the grouting hole 342 through the rotating pipe 333, the connecting pipe 327, and the fixed pipe 326, filling the bottom of the hole. The BIM model calculates the grouting volume in real time. When the grout level is detected to be higher than the coating component 6, a stop signal is sent to the lifting component 7.

[0036] Upon receiving the BIM signal, the lifting assembly 7 reverses its movement: the cylinder 72 retracts, causing the lifting plate 73 to move downwards, and the sliding tube 321 descends accordingly. The through slot 324 of the gate 323 aligns with the grouting pipe 334 (opening the lateral channel), and the connecting pipe 327 disengages from the flow channel pipe 345 (closing the bottom grout outlet). Because the total cross-sectional area of ​​the grouting pipe 334 is smaller than that of the grout outlet 342, the mortar injection speed increases under the same pressure, and the impact force is enhanced. At this time, the drive motor 2 drives the drilling pipe 31 to rotate in the opposite direction, and the threaded rod of the frame 1 drives the drive motor 2 to move upwards, realizing the coordinated operation of rotation, lifting and grouting.

[0037] In the coating component 6, high-pressure mortar is sprayed into the guide box 62 through the connecting sleeve 63. The V-shaped blade 61 gathers the unmixed soil towards the center. The arc-shaped inner wall of the guide box 62 guides the mortar to impact the soil and form mixed mud. Under the action of centrifugal force and the inclined surface of the guide box 62, the mixed mud flows to the coating plate 64. After overflowing from the slurry outlet 65, it is pressed onto the hole wall to form a pre-reinforced layer. Excess mixed mud is discharged from the auxiliary port 66.

[0038] In the mixing component 5, the extrusion blade 51 pushes the soil towards the center, the combing groove 53 of the diversion plate 52 divides the soil to form voids, high-pressure mortar penetrates and mixes, the auxiliary plate 54 further presses the mixed mud against the hole wall, reinforces the pre-coating layer and buffers the impact, and the mixing blade 4 finally cuts and mixes, so that the mortar and soil are evenly integrated from the inside to the outside to form a concrete pile. The air groove block 35 continuously balances the internal air pressure of the drill bit component 34 to ensure that the moving component 32 slides smoothly.

[0039] Example 3, referring to Figure 1 - Figure 10 The third embodiment of the present invention provides a BIM-based method for constructing suspended mixing piles in deep foundation pits, comprising the following steps: S1. Drive motor 2 drives drilling assembly 3 to rotate and descend along frame 1 to drill holes. At this time, grout pipe 331 does not inject grout. During the drilling process, except for grout pipe 331 and limit ring 332, the other components are driven by drive motor 2 and rotate synchronously with drilling pipe 31. S2. After drilling is completed, start the lifting component 7 to raise the movable component 32, so that the connecting pipe 327 is connected to the flow channel pipe 345. The grout inlet pipe 331 injects mortar and grout is injected from the bottom of the hole through the grout outlet hole 342 until the grout injected into the hole is higher than the coating component 6 as shown by BIM calculation, then stop the support of the lifting component 7. S3, the lifting component 7 descends, causing the movable component 32 to move down, switching to the grouting pipe 334 for grouting. The drive machine 2 drives the drilling component 3 to rotate and rise. The coating component 6 pre-coats the inner wall of the hole, while the mixing component 5 strengthens the mixing of mud and slurry in the hole, forming a mixed mud column with the mixing blade 4. When the lifting component 7 descends and changes the grouting position of the construction organization, the height of the drive machine 2 is raised simultaneously.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A BIM-based deep foundation pit suspended mixing pile construction device, comprising a frame (1) and a drive unit (2) disposed on the top of the frame (1), characterized in that, It also includes a drilling assembly (3) disposed at the output end of the drive unit (2), a lifting assembly (7) disposed on the drive unit (2), multiple stirring blades (4) disposed in a ring at equal intervals on the side wall of the drilling assembly (3) near the bottom position, and a coating assembly (6) and a mixing assembly (5) disposed in sequence on the side wall of the drilling assembly (3) in the vertical direction, wherein the mixing assembly (5) is located above the stirring blades (4); The drilling assembly (3) includes a drilling pipe (31) disposed on the output end of the drive motor (2), a connecting pipe (37) fixedly disposed on the inner wall of the drilling pipe (31), a movable component (32) slidably disposed on the inner wall of the connecting pipe (37), a slurry conveying component (33) disposed on the inner wall of the movable component (32), a drill bit assembly (34) disposed at the bottom of the drilling pipe (31), an air groove block (35) disposed near the bottom of the connecting pipe (37), and a lifting pipe (36) disposed at the top of the movable component (32). The active component (32) includes a sliding tube (321) slidably disposed on the wall of the connecting tube (37), with the outer wall of the top of the sliding tube (321) fixedly connected to the outer wall of the bottom of the lifting tube (36), a ventilation slot (322) opened on the side wall of the sliding tube (321), a gate (323) disposed in the middle of the sliding tube (321), a plurality of rectangular slots (324) evenly and equidistantly opened in the middle of the gate (323) in the vertical direction, a cross connecting ring (325) disposed at the bottom of the sliding tube (321), a fixed tube (326) disposed at the bottom of the side wall of the cross connecting ring (325), a connecting tube (327) disposed at the top of the fixed tube (326), and a plurality of slurry holes (328) equidistantly opened in a ring on the connecting tube (327) near the top of the tube wall.

2. The BIM-based deep foundation pit suspended mixing pile construction device according to claim 1, characterized in that, The grout delivery assembly (33) includes a grout inlet pipe (331) rotatably disposed on the inner wall of the sliding pipe (321), a limiting ring (332) sealed and fixedly disposed on the inner wall of the grout inlet pipe (331) near the bottom, a rotating pipe (333) disposed on the inner wall of the limiting ring (332), and a grout passage pipe (334) disposed on the inner wall of the rotating pipe (333), wherein the outer wall of the grout passage pipe (334) is fixedly connected to the inner wall of the connecting pipe (37).

3. The BIM-based deep foundation pit suspended mixing pile construction device according to claim 2, characterized in that, The drill bit assembly (34) includes a drill bit (341) disposed on the bottom outer wall of the drill pipe (31), a plurality of slurry outlet holes (342) opened inside the drill bit (341), an air pressure balance slot (346) opened inside the drill bit (341), a limiting tube (343) fixedly disposed on the inner wall of the drill bit (341), a plurality of limiting grooves (344) opened inside the limiting tube (343), and a flow channel tube (345) fixedly disposed on the top of the limiting tube (343), and the side wall of the top of the flow channel tube (345) is fixedly connected to the inner wall of the bottom of the rotating tube (333).

4. The BIM-based deep foundation pit suspended mixing pile construction device according to claim 1, characterized in that, The mixing component (5) includes an extrusion blade (51) disposed on the side wall of the drill pipe (31), a flow divider (52) disposed on the inner wall of the extrusion blade (51), a combing groove (53) opened on the bottom outer wall of the flow divider (52), and an auxiliary plate (54) disposed on the side wall of the extrusion blade (51).

5. A BIM-based deep foundation pit suspended mixing pile construction device according to claim 2, characterized in that, The coating assembly (6) includes a V-shaped blade (61) disposed on the side wall of the drill pipe (31), a guide box (62) disposed on the top of the V-shaped blade (61), a connecting sleeve (63) disposed on the side wall of the guide box (62), and the inner wall of the connecting sleeve (63) is fixedly connected to the outer wall of the grouting pipe (334), a coating plate (64) disposed on the side wall of the V-shaped blade (61), a grout outlet groove (65) opened on the coating plate (64), and an auxiliary port (66) opened on the coating plate (64).

6. The BIM-based deep foundation pit suspended mixing pile construction device according to claim 1, characterized in that, The lifting assembly (7) includes an air pump (71) disposed on the top outer wall of the drive unit (2), a cylinder (72) disposed on the output end of the air pump (71) via a pipe, a lifting plate (73) disposed on the top of the cylinder (72), and a limiting rod (74) disposed on the inner wall of the lifting plate (73). The outer wall at the bottom of the limiting rod (74) and the outer wall at the bottom of the cylinder (72) are both fixedly connected to the outer wall at the top of the drive unit (2).

7. A BIM-based deep foundation pit suspended mixing pile construction method, employing the BIM-based deep foundation pit suspended mixing pile construction device described in claims 1-3, characterized in that... Includes the following steps: S1. The drive machine (2) drives the drilling assembly (3) to rotate and descend along the frame (1) to drill. At this time, the grout pipe (331) does not inject grout. During the drilling process, except for the grout pipe (331) and the limiting ring (332), the other components are driven by the drive machine (2) and rotate synchronously with the drilling pipe (31). S2. After drilling is completed, start the lifting assembly (7) to raise the movable assembly (32) so that the connecting pipe (327) is connected to the flow channel pipe (345). The grout inlet pipe (331) injects mortar and grouts from the bottom of the hole through the grout outlet hole (342) until the grout injected into the hole is higher than the coating assembly (6) as shown by BIM calculation, then stop the support of the lifting assembly (7). S3, the lifting component (7) descends and drives the moving component (32) to move down, switching to the grouting pipe (334) for grouting. The drive machine (2) drives the drilling component (3) to rotate and rise. The coating component (6) pre-coats the inner wall of the hole, while the mixing component (5) strengthens the mixing of mud and slurry in the hole, and the mixing blade (4) forms a mixed mud column.

8. The BIM-based deep foundation pit suspended mixing pile construction method according to claim 7, characterized in that, When the lifting assembly (7) descends and changes the spraying position of the construction organization, the height of the drive machine (2) is simultaneously raised.

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