Bidirectional cement-soil mixing pile for highway foundation and construction technology

Abstract

The invention relates to a bidirectional cement-soil mixing pile for a road foundation and a construction technology, and belongs to the field of foundation reinforcement construction technology.The bidirectional cement-soil mixing pile comprises a pile machine, a tower is rotationally connected to the pile machine, a sliding seat is slidably connected to the tower, a transmission box is arranged on the sliding seat, a drill sleeve is rotationally connected into the transmission box, and a drill rod is coaxially and rotationally connected into the drill sleeve; blades are arranged at the bottom ends of the drill rod and the drill sleeve, a first gear is arranged at the top end of the drill rod, a second gear is arranged at the top end of the drill sleeve, a reversing gear and a gear shaft are rotationally connected into the transmission case, the reversing gear is meshed with the first gear, and the gear shaft is meshed with the reversing gear and the second gear at the same time; a motor shaft of the servo motor is connected with the gear shaft through a transmission assembly, a grouting groove is formed in the drill rod, and a grout outlet hole is formed in the bottom of the drill rod. The device has the effects of protecting the servo motor, prolonging the service life of the drill rod, the drill sleeve and the blade and saving resource waste.

Description

Technical Field

[0001] The present application relates to the field of foundation reinforcement construction technology, and in particular to a bidirectional cement-soil mixing pile for highway foundation and a construction process. Background Art

[0002] Cement mixing piles are a type of pile that uses cement as the main curing agent. Cement is sprayed into the soil using a mixing pile machine and fully mixed, causing a series of physical and chemical reactions between the cement and the soil, hardening the soft soil and increasing the foundation strength.

[0003] Chinese patent publication number CN203639904U discloses a cement mixing pile machine, which includes a base, a tower, a drill rod, a grouting pipe joint fixedly mounted on the drill rod, a motor, a transmission device, and a drive device; the tower is vertically mounted on the base, and the transmission device is mounted on the tower; the drive device drives the drill rod to reciprocate up and down through the transmission device; the motor is mounted on the base, and the motor is used to drive the drill rod to rotate.

[0004] With respect to the above-mentioned related technologies, the inventors believe that during the actual construction process, when the drill rod is subjected to excessive resistance or is stuck, if the motor continues to output power, it is easy for the motor to be damaged due to overload. Summary of the Invention

[0005] In order to improve the problem of motor overload damage, the present application provides a bidirectional cement-soil mixing pile for highway foundation and a construction process.

[0006] In the first aspect, the present application provides a bidirectional cement-soil mixing pile for highway foundation using the following technical solution: The top end of the drill rod is provided with a first gear, and the top end of the drill rod is provided with a second gear, and the second gear is engaged with the first gear and the second gear at the bottom end of the drill rod. A servo motor is installed on the slide seat, and the motor shaft of the servo motor is connected with the gear shaft through a transmission assembly. A grouting groove is provided in the drill rod, and a slurry outlet is provided at the bottom of the drill rod. A hydraulic cylinder is hinged on the pile driver, and the piston rod of the hydraulic cylinder is hinged to the side wall of the tower. The pile driver is provided with a lifting assembly for driving the slide seat to move.

[0007] By adopting the above technical solution, during construction, the operator connects the grouting pipe to the top of the drill rod, the hydraulic cylinder drives the tower to rotate to a vertical state, the servo motor drives the gear shaft to rotate through the transmission assembly, the gear shaft drives the reversing gear and the second gear to rotate, the second gear drives the first gear to rotate, so that the drill sleeve and the drill rod rotate synchronously in the opposite direction, the lifting assembly drives the slide to move downward, the slide drives the drill sleeve and the drill rod to descend, the rotating blade drills into the soil, the grouting pipe transports cement slurry to the grouting tank, the cement slurry is sprayed out from the slurry hole and mixed with the soil under the stirring of the two blades; when the drill sleeve and drill rod are stuck or When the resistance is too great, the transmission assembly is disconnected, cutting off the power to the drill sleeve and drill rod, reducing the possibility of damage to the servo motor due to overload, while also protecting the blades, drill sleeve and drill rod, extending the service life of the components; the two blades rotate synchronously in opposite directions, enhancing the cutting effect on the soil and the mixing effect of the soil and cement slurry, which is beneficial to improving the quality of the pile after formation; the first gear, the second gear, the reversing gear and the gear shaft are concentrated in the transmission box, which not only realizes the reverse rotation of the drill sleeve and drill rod, but also realizes the independence of the servo motor, reducing the direct impact load on the servo motor.

[0008] Optionally, the transmission assembly includes a driving plate and a driven plate, the gear shaft passes through the outside of the transmission case and is coaxially connected to a sleeve, a driving plate is provided in the sleeve, a plurality of circumferentially distributed T-blocks are provided on the driving plate, a T-slot for sliding the T-blocks is provided on the inner wall of the sleeve, each of the T-blocks is connected to the bottom of the T-slot through a first spring, the driven plate is located on the driving plate, and a plurality of arc grooves are provided on the side of the driven plate facing the driving plate, a clamping block is inserted in each of the arc grooves, the clamping block is located at one end of the arc groove, and the clamping block is connected to the other end of the slide groove through a second spring, and a clamping slot for inserting each clamping block is provided on the driving plate; The driven disc is provided with a plurality of circumferentially arranged guide rods, and the inner wall of the sleeve is provided with an oblique groove for inserting each guide rod; The driving disc is located above the driven disc and is connected to the motor shaft of the servo motor. The driving disc and the driven disc are both provided with mutually meshing external teeth on opposite sides.

[0009] By adopting the above technical solution, the servo motor drives the active disk to rotate, the active disk drives the driven disk to rotate, the driven disk drives the shaft sleeve to rotate, and the shaft sleeve drives the gear shaft to rotate; when the drill rod or drill sleeve stops drilling or the resistance is too large, the driven disk overcomes the elastic force of the second spring under the driving force of the servo motor, so that the driven disk rotates relative to the driving disk, and the guide rod moves along the inclined groove under the drive of the driven disk, so that the driven disk moves downward, and the blocking block pushes the driving disk downward, thereby realizing the separation of the driven disk and the active disk; when the drill sleeve and the drill rod are impacted, the first and second springs act as a buffer, thereby reducing the impact on the normal operation of the servo motor.

[0010] Optionally, the side wall of the sleeve is hinged to a limit rod through a hinge shaft, a torsion spring is sleeved on the hinge shaft, and a limit block is provided on the side wall of the limit rod. A first limit groove connected to the T-slot is opened on the sleeve, and the limit block passes through the first limit groove and is inserted into the T-slot. An inclined guide surface is provided at the end of the limit block, and a second limit groove is opened on the side wall of the T-block.

[0011] By adopting the above technical solution, when the driving disk descends, the T-block squeezes the guide surface of the limit block, causing the limit rod to rotate away from the shaft sleeve. When the limit block moves to correspond to the second limit groove, the limit rod reverses under the elastic force of the torsion spring, driving the limit block to insert into the second limit groove, limiting the movement of the T-block, thereby keeping the active disk and the driven disk disengaged.

[0012] Optionally, the bottom surface of the active disk is coaxially connected to a core shaft, the core shaft passes through the driven disk and the driving disk and is inserted into the sleeve, the bottom end of the core shaft is provided with a plurality of circumferentially distributed ratchets, the sleeve is slidably connected with a support rod, one end of the support rod passes through the sleeve and abuts against the limit rod, the other end is provided with an elastic paddle, the paddle is tangent to the ratchet, the bottom of the sleeve is provided with a long groove corresponding to the limit rod, the long groove is provided with an elastic corrugated sheet, one end of the corrugated sheet is connected to the support rod, and the other end is connected to the bottom of the long groove.

[0013] By adopting the above technical solution, when the active disk and the driven disk are disengaged, the servo motor reverses, the active disk drives the core shaft to rotate, the ratchet on the core shaft clamps the paddle, so that the paddle pushes the support rod, and the support rod pushes the limit rod to rotate, so that the limit block moves out of the second limit groove, and the T-block drives the driving disk to move upward under the elastic force of the first spring. At the same time, the second spring driven disk reverses, so that the driven disk reverses and moves upward synchronously, and the outer teeth of the driven disk and the active disk engage with each other. At this time, the servo motor can be controlled to rotate forward to restore the driving force on the drill sleeve and drill rod. It is flexible and convenient, which helps to improve the efficiency of on-site construction.

[0014] Optionally, an intermediate column is provided in the arc groove, screw holes are provided in the intermediate column and the clamping block, countersunk screws are threadedly connected in the screw holes, washers are fixed at both ends of the second spring, protrusions are provided on the side walls of the washers, grooves for inserting the protrusions are provided on the side walls of the intermediate column and the clamping block, the countersunk screws pass through the protrusions, and the countersunk screws corresponding to the intermediate column are threadedly connected in the driven disk; The side wall of the card block is provided with a first guide groove connected to the screw hole, and a guide block is slidably connected in the first guide groove. The end of the guide block away from the screw hole is provided with two relatively distributed inclined surfaces, and the end of the guide block close to the screw hole is provided with two arc-shaped first elastic sheets, and the ends of the two first elastic sheets away from the guide block are inserted into the screw hole and are connected by arc-shaped second elastic sheets, the first elastic sheets abut against the edge of the notch of the first guide groove, and the wall of the arc groove is provided with a second guide groove for the guide block to slide, and the second guide groove is adapted to the two inclined surfaces on the guide block.

[0015] By adopting the above technical solution, the operator can unscrew the countersunk screw to separate the protrusion and replace the second spring to ensure the elastic force of the second spring; when the countersunk screw in the clamping block is turned, the end of the countersunk screw squeezes the second spring piece, forcing the first spring piece to move into the first guide groove, and the first spring piece drives the guide block to be inserted into the second guide groove, which guides the movement of the clamping block, improves the stability of the movement of the clamping block, and is convenient for loading and unloading.

[0016] Optionally, the transmission box is fixed to the slide by screws, a base is slidably connected inside the slide, the base is fixed to the slide by bolts, and a waist-shaped groove is provided on the base for the bolts to pass through.

[0017] By adopting the above technical solution, the operator can slide the base to separate the active disk and the driven disk, cutting off the power transmission for easy maintenance or transportation, meeting the needs of different situations; the transmission box adopts a detachable connection, which is convenient for the installation, debugging, disassembly and replacement of the active disk and the driven disk.

[0018] Optionally, a positioning plate is provided in the end of the tower close to the pile driver, and two positioning hooks are hinged on the positioning plate, and a stop block is provided between the two positioning hooks. A support is vertically provided on the positioning plate, and an adjusting block is slidably connected to the support. An adjusting rod corresponding to the positioning hook is ball-hinged on the adjusting block, and one end of the adjusting rod away from the adjusting block is ball-hinged with the positioning hook. An oil cylinder is installed in the tower, and the piston rod of the oil cylinder is connected to the adjusting block.

[0019] By adopting the above technical solution, the oil cylinder drives the adjusting block to move upward, and the adjusting block drives the two adjusting rods to approach each other, and the two adjusting rods drive the positioning hooks to rotate. When the positioning hooks abut against the stop block, the two positioning hooks just hold the drill sleeve, which plays a guiding role on the drill sleeve, reducing the possibility of the drill sleeve shifting during the movement, thereby improving the position accuracy of the pile; the opening and closing of the two positioning hooks provides space for the downward movement of the blade, which facilitates the movement and loading and unloading of the drill sleeve.

[0020] Optionally, the lifting assembly includes a winch and a steel rope, the winch is installed on the pile driver, the steel rope is wound on the roller of the winch, and the head of the steel rope is connected to the slide, and a pulley for the steel rope to pass around is rotatably connected to the tower.

[0021] By adopting the above technical solution, the winch is started, the driving roller reels in or releases the steel rope, and the steel rope drives the slide to rise or fall accordingly.

[0022] In a second aspect, the present application provides a construction process for bidirectional cement-soil mixing piles for highway foundations, which adopts the following technical solutions: A construction process for bidirectional cement-soil mixing piles for highway foundations comprises the following steps: S1, leveling the site; S2, laying out the construction lines and determining the pile position; S3, aligning and leveling the pile driver; S4, starting a servo motor to drive two blades to simultaneously rotate forward and reverse for cutting, delivering slurry to a nozzle with a pressure set at 0.3 MPa; S5, sinking a drill rod for spraying and mixing; S6, lifting and mixing; and S7, cleaning the drill rod, drill sleeve, and blades, and moving the pile driver to the next pile for construction.

[0023] By adopting the above technical solution, double blade cutting can speed up the pile hole forming speed, which is conducive to saving construction time.

[0024] Optionally, in step S5, the slurry pump is turned on at 25 cm below the ground surface to spray cement slurry into the soil. When the drill rod reaches the designed depth, the slurry is stirred for more than 10 seconds.

[0025] By adopting the above technical solution, continuous spraying and stirring ensures the amount of cement slurry in the pile hole and the forming effect of the pile bottom.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. When the drill sleeve or drill rod is stuck or encounters excessive resistance, the transmission assembly disconnects, cutting off the power to the drill sleeve and drill rod, reducing the possibility of damage caused by servo motor overload, while also protecting the blade, drill sleeve and drill rod; 2. The second spring adopts a replaceable structure, which is conducive to ensuring the elastic force of the second spring; the guide block is fixedly combined with the clamping block, which not only guides the clamping block but also simplifies installation; 3. The positioning hook guides the drill sleeve and improves the position accuracy of the pile. The opening and closing of the two positioning hooks provide space for the downward movement of the blade, facilitating the movement and loading and unloading of the drill sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0028] Figure 2 yes Figure 1 Enlarged schematic diagram of part A.

[0029] Figure 3 It is a structural schematic diagram of the first gear and the second gear used in an embodiment of the present application.

[0030] Figure 4 It is a structural schematic diagram of the stop block used in an embodiment of the present application.

[0031] Figure 5 It is a structural diagram of a transmission assembly used in an embodiment of the present application.

[0032] Figure 6 It is an exploded schematic diagram used to illustrate the active disk and the driven disk in an embodiment of the present application.

[0033] Figure 7 It is a structural diagram of the embodiment of the present application used to reflect the clamping block and the guide block.

[0034] Figure 8 It is a schematic structural diagram of the first spring piece and the second spring piece used in an embodiment of the present application.

[0035] Figure 9 It is an exploded schematic diagram illustrating the drive disc and the shaft sleeve according to an embodiment of the present application.

[0036] Figure 10 It is a structural diagram of the embodiment of the present application used to reflect the paddle and ratchet.

[0037] Figure 11 yes Figure 10 Schematic diagram of the enlarged portion B.

[0038] Figure 12 It is a structural diagram of the lifting assembly used in an embodiment of the present application.

[0039] Figure 13 It is a schematic diagram used to illustrate the process flow in an embodiment of the present application.

[0040] Explanation of the accompanying symbols: 1. pile driver; 11. tower; 12. slide; 13. transmission box; 14. drill sleeve; 15. drill rod; 151. grouting groove; 152. slurry outlet hole; 16. blade; 17. hydraulic cylinder; 18. diagonal support rod; 21. first gear; 22. second gear; 23. reversing gear; 24. gear shaft; 25. servo motor; 3. transmission assembly; 31. driving plate; 32. driven plate; 321. guide rod; 33. bushing; 331. T-slot; 332. oblique slot; 34. driving plate; 35. T-block; 351. first spring; 36. arc slot; 37. clamping block; 371. clamping slot; 38. second spring; 39. external tooth; 4. limit rod; 41. articulated shaft; 411. torsion spring; 42. Limit block; 421, guide surface; 43, first limit groove; 44, second limit groove; 45, core shaft; 451, ratchet; 46, support rod; 461, pick; 47, long groove; 48, corrugated sheet; 51, first guide groove; 52, guide block; 521, inclined surface; 522, steel ball; 53, first spring piece; 54, second spring piece; 55, second guide groove; 56, countersunk screw; 57, intermediate column; 571, screw hole; 58, gasket; 59, protrusion; 591, groove; 6, base; 61, waist groove; 7, positioning plate; 71, positioning hook; 72, stop block; 73, support; 74, adjusting block; 741, adjusting rod; 75, oil cylinder; 8, lifting assembly; 81, winch; 82, steel rope; 83, pulley. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-12 This application is described in further detail.

[0042] The present application discloses a bidirectional cement-soil mixing pile for highway foundation. Figure 1 The bidirectional cement-soil mixing pile includes a pile driver 1 and two hydraulic cylinders 17. The pile driver 1 is horizontally arranged and rotatably connected to a tower 11, which is perpendicular to the pile driver 1. The two hydraulic cylinders 17 are symmetrically arranged on either side of the tower 11, with the cylinder ends of the hydraulic cylinders 17 hinged to the pile driver 1, and the piston rods of the hydraulic cylinders 17 hinged to the side walls of the pile driver 1. Two diagonal braces 18 are hinged to the side walls of the tower 11. Both braces 18 and one end of the tower 11 are fixed to the pile driver 1 by screws. The braces 18, the tower 11, and the pile driver 1 form a triangular structure, which improves the stability of the tower 11.

[0043] like Figure 2 and Figure 3A slide 12 is slidably connected to the tower 11, which moves along its height. A transmission box 13 is fixed to the slide 12 via screws. The transmission box 13 is divided into upper and lower halves and secured by bolts. A drill sleeve 14 is rotatably connected to the transmission box 13. The drill sleeve 14 is parallel to the tower 11 and extends downward through the slide 12. A coaxial drill rod 15 is rotatably connected to the drill sleeve 14. The lower end of the drill rod 15 extends out of the drill sleeve 14, and the upper end of the drill rod 15 extends out of the transmission box 13. A cutting blade 16 is fixed to the lower end of each drill sleeve 14 and drill rod 15. Grouting grooves 151 are arranged along the length of the drill rod 15. A grouting hole 152 is provided at the lower end of the drill rod 15, which is connected to the grouting grooves 151. A sealing ring is provided in the drill sleeve 14 to cooperate with the drill rod 15. The sealing ring is mounted on the drill rod 15 to block the passage between the drill rod 15 and the drill sleeve 14.

[0044] A first gear 21 is coaxially fixed to one end of the drill rod 15 within the transmission case 13. A second gear 22 is coaxially fixed to one end of the drill sleeve 14 within the transmission case 13. The second gear 22 is located below the first gear 21. A reversing gear 23 and a gear shaft 24 are rotatably connected within the transmission case 13. The reversing gear 23 meshes with the first gear 21, and the gear shaft 24 meshes with the reversing gear 23 and the second gear 22. The gear shaft 24 extends upwardly out of the transmission case 13. A base 6 is slidably connected within the slide 12. The movement direction of the base 6 is parallel to the axis of the gear shaft 24. The base 6 is fixed to the slide 12 by bolts. There are four bolts symmetrically distributed on both sides of the base 6. The base 6 is provided with waist-shaped grooves 61 for each bolt to pass through. The waist-shaped grooves 61 are parallel to the movement direction of the base 6. A servo motor 25 is mounted on the side wall of the slide 12. The servo motor 25 is coaxially distributed above and above the gear shaft 24. The servo motor 25 meshes with the gear shaft 24 through the transmission assembly 3.

[0045] The pile driver 1 is provided with a lifting assembly 8 for driving the slide 12 to move.

[0046] like Figure 4The tower 11 is provided with a positioning plate 7 at one end near the pile driver 1. Two positioning hooks 71 are hingedly connected to the positioning plate 7. The axes of the positioning hooks 71 are parallel to the axis of the drill sleeve 14. A stop block 72 and a support 73 are vertically provided on the positioning plate 7. The stop block 72 is located between the two positioning hooks 71. When the positioning hooks 71 abut the stop block 72, the positioning hooks 71 and the drill sleeve 14 are coaxially arranged. The support 73 is located on the side of the stop block 72 facing away from the drill sleeve 14. An adjustment block 74 that moves along the height direction of the tower 11 is slidably connected to the side wall of the support 73. Two adjustment rods 741 are ball-hinged on the adjustment block 74. The adjustment rods 741 correspond one-to-one with the positioning hooks 71, and the ends of the adjustment rods 741 away from the adjustment block 74 are ball-hinged with the positioning hooks 71. The distance between the two adjustment rods 741 and the adjustment block 74 is smaller than the distance between the two adjustment rods 741 and the positioning hooks 71. An oil cylinder 75 is fixed in the tower 11 . The axis of the oil cylinder 75 is parallel to the tower 11 . The oil cylinder 75 is located above the support 73 . The end of the piston rod of the oil cylinder 75 is connected to the adjustment block 74 .

[0047] In the initial state, the two hooks are open to each other, and the opening distance is greater than the rotating outer diameter of the blade 16. The cylinder 75 drives the adjustment block 74 to move upward, and the adjustment block 74 drives the two adjustment rods 741 to approach each other, thereby driving the two positioning hooks 71 to rotate and approach each other until they abut against the stop block 72.

[0048] During construction, the operator connects the upper end of the drill rod 15 to the cement slurry pump station via a pipeline. The servo motor 25 drives the gear shaft 24 through the transmission assembly 3. The gear shaft 24 drives the second gear 22 and the reversing gear 23. The reversing gear 23 drives the first gear 21. The first gear 21 and the second gear 22 rotate the drill rod 15 and the drill sleeve 14 respectively. The drill rod 15 and the drill sleeve 14 drive the blade 16 to rotate, and the two blades 16 rotate in opposite directions. The lifting assembly 8 drives the slide 12 downward. When the blade 16 passes the positioning hook 71, the oil cylinder 75 drives the adjustment block 74 upward, causing the two positioning hooks 71 to rotate and hold the drill sleeve 14, guiding the drill sleeve 14 to move up and down.

[0049] When blades 16 penetrate the soil, the pumping station starts, and cement slurry is fed into the grouting tank 151 through a pipe. Then, it is ejected from the slurry outlet 152. The rotating blades 16 mix the soil and cement slurry, and after the cement slurry solidifies, a cement-soil mixing pile is formed. The two blades 16 cut simultaneously and rotate in opposite directions, which speeds up the pile hole formation and improves the mixing efficiency, thus reducing construction time.

[0050] When the drill sleeve 14 and the drill rod 15 are subjected to excessive resistance or stop, the transmission assembly 3 disconnects the power transmission between the servo motor 25 and the gear shaft 24, which reduces the overload of the servo motor 25 on the one hand and the possibility of damage to the drill sleeve 14, the drill rod 15 and the blade 16 on the other hand.

[0051] like Figure 5 and Figure 6 The transmission assembly 3 includes a sleeve 33, which is rotatably connected to the transmission case 13 and coaxially connected to the end of the gear shaft 24 that passes through the transmission case 13. A drive disk 34 is provided in the sleeve 33, and a plurality of T-blocks 35 are arranged equidistantly in the circumferential direction on the outer circumferential wall of the drive disk 34. The inner wall of the sleeve 33 is provided with T-slots 331 corresponding to the T-blocks 35 one by one. The T-slots 331 are parallel to the axis of the sleeve 33. The T-blocks 35 are slidably connected in the corresponding T-slots 331, and the T-blocks 35 are connected to the bottom of the elastic groove through a first spring 351.

[0052] The driving disk 34 is rotatably connected to a coaxially distributed driven disk 32. The driven disk 32 is provided with a plurality of arc grooves 36 equidistantly distributed around its own axis on one side facing the driving disk 34. A clamping block 37 and an intermediate column 57 are inserted into each arc groove 36. The clamping block 37 and the intermediate column 57 are respectively located at both ends of the arc groove 36. The clamping block 37 extends out of the arc groove 36. A clamping groove 371 corresponding to the clamping block 37 is provided on the driving disk 34, and the clamping block 37 is inserted into the clamping groove 371. The intermediate column 57 is parallel to the notch of the arc groove 36.

[0053] like Figure 7 and Figure 8 A plurality of parallel second springs 38 are disposed between the clamping block 37 and the intermediate column 57. A washer 58 is fixed to each end of each second spring 38. A protrusion 59 is fixed to the sidewall of the washer 58. Both the clamping block 37 and the intermediate column 57 have grooves 591 formed in their sidewalls for the protrusions 59 to be inserted into. Screw holes 571 are provided in both the clamping block 37 and the intermediate column 57. These screw holes 571 communicate with the grooves 591. Countersunk screws 56 are threadedly connected to the inner portions of the screw holes 571. The countersunk screws 56 pass through the guide block 52, securing the guide block 52 within the grooves 591. This secures the ends of the second springs 38 to the clamping block 37 and the intermediate column 57, respectively. The corresponding countersunk screws 56 on the intermediate column 57 pass through the intermediate column 57 and are threadedly connected to the driven disk 32, securing the intermediate column 57 to the driven disk 32.

[0054] The clamping block 37 and the intermediate column 57 remain in a relatively static state under the elastic force of the second spring 38 , and when the driven disk 32 rotates, the driving disk 34 is driven to rotate synchronously through the clamping block 37 .

[0055] Two first guide grooves 51 are provided on the side wall of the clamping block 37 and are symmetrically distributed about its axis. The two first guide grooves 51 are both connected to the screw hole 571, and a guide block 52 is slidably connected in the two first guide grooves 51. The end of the guide block 52 away from the screw hole 571 is provided with two oppositely distributed inclined surfaces 521. The two inclined surfaces 521 make the end of the guide block 52 present an isosceles trapezoid; the end of the guide block 52 close to the screw hole 571 is provided with two arc-shaped first elastic pieces 53, the two first elastic pieces 53 are both inserted into the screw hole 571 and the two ends inserted into the screw hole 571 are connected by a second elastic piece 54, the two first elastic pieces 53 move away from each other in the direction away from the guide block 52, and at the same time, the two first elastic pieces 53 abut against the edge of the notch of the first guide groove 51 close to the screw hole 571. The countersunk screw 56 in the clamping block 37 abuts the second spring piece 54. The wall of the arc groove 36 defines a second guide groove 55 corresponding one-to-one with the guide block 52. The guide block 52 is inserted into the second guide groove 55, and the second guide groove 55 is adapted to the end of the guide block 52 with the inclined surface 521. The end of the guide block 52 is embedded with a steel ball 522 that abuts the bottom of the second guide groove 55. At this time, the first spring piece 53 and the second spring piece 54 are in an elastically deformed state, abutting the wall of the first guide groove 51, limiting the movement of the guide block 52. When the clamping block 37 moves along the arc groove 36, the guide block 52 moves along the second guide groove 55, guiding the guide block 52.

[0056] When the countersunk screw 56 in the clamping block 37 is offset from the first guide groove 51, the operator pulls the clamping block 37 outward, and the inclined surface 521 of the guide block 52 abuts against the groove wall of the second guide groove 55, applying a thrust parallel to the guide block 52, causing the guide block 52 to move into the screw hole 571, driving the guide block 52 to move into the first guide groove 51; when the countersunk screw 56 moves to squeeze the second elastic piece 54, the second elastic piece 54 pushes the first elastic piece 53 to move into the first guide groove 51, the two first elastic pieces 53 approach each other and produce elastic deformation, and the first elastic piece 53 drives the guide block 52 to move out of the first guide groove 51.

[0057] like Figure 9 The driven disc 32 is provided with a plurality of guide rods 321 arranged equidistantly along the circumference of its axis. The guide rods 321 are distributed radially along the driven disc 32. The inner wall of the sleeve 33 is provided with inclined grooves 332 corresponding to the guide rods 321. The inclined grooves 332 are spiral and distributed along the axial direction of the sleeve 33.

[0058] The motor shaft of the servo motor 25 is coaxially fixed with a driving disk 31. The driving disk 31 is located above the driven disk 32, and both are provided with a plurality of circumferentially distributed external teeth 39 on opposite sides. The external teeth 39 on the driving disk 31 and the driven disk 32 are meshed with each other, and two adjacent external teeth 39 are provided with a conical surface at the meshing position.

[0059] like Figure 5 and Figure 10The side wall of the sleeve 33 is hinged to the limit rod 4 through the hinge shaft 41. The side wall of the limit rod 4 is vertically provided with a limit block 42. The sleeve 33 is provided with a first limit groove 43 corresponding to the limit block 42. The first limit groove 43 is larger than the limit block 42. The first limit groove 43 is connected to the T-slot 331. The limit block 42 passes through the first limit groove 43 and is inserted into the T-slot 331. The end of the limit block 42 inserted into the T-slot 331 is provided with an inclined guide surface 421. The guide surface 421 is distributed opposite to the T-block 35. The side wall of the T-block 35 is provided with a second limit groove 44. Figure 11 A torsion spring 411 is sleeved on the hinge shaft 41 . When the torsion spring 411 is in a natural state, one end of the limiting block 42 with a guide surface 421 is located in the T-slot 331 .

[0060] A support rod 46 is slidably connected to the bottom of the sleeve 33. One end of the support rod 46 passes through the outside of the sleeve 33 and abuts against the limit rod 4. The other end of the support rod 46 is connected to an elastic paddle 461. A long groove 47 distributed along the length direction of the support rod 46 is provided at the bottom of the sleeve 33. An elastic corrugated sheet 48 is fixed to the bottom of the long groove 47. The corrugated sheet 48 is S-shaped, and the end of the corrugated sheet 48 away from the bottom of the long groove 47 is connected to the bottom surface of the support rod 46; a core shaft 45 is coaxially connected to the bottom surface of the active disk 31. The core shaft 45 passes downward through the driven disk 32 and the driving disk 34 in sequence and is inserted into the sleeve 33. A plurality of ratchet teeth 451 are arranged equidistantly along the circumference of its axis at one end of the core shaft 45 away from the active disk 31. The ratchet teeth 451 correspond to the paddle pieces 461. Under the elastic force of the corrugated sheet 48, the support rod 46 drives the paddle pieces 461 to maintain a state of abutting against the ratchet teeth 451.

[0061] The servo motor 25 drives the active disk 31 to rotate, the active disk 31 drives the driven disk 32 and the core shaft 45 to rotate, the driven disk 32 drives the driving disk 34 to rotate, and the driving disk 34 drives the gear shaft 24 to rotate, thereby driving the drill sleeve 14 and the drill rod 15 to rotate. At this time, the paddle 461 is tangent to the ratchet 451.

[0062] When the resistance encountered by the drill sleeve 14 and the drill rod 15 is too great or they stop, the servo motor 25 maintains output, and the torsional force between the driven disc 32 and the driving disc 34 is greater than the elastic force of the second spring 38. The driven disc 32 rotates relatively, and the second spring 38 is compressed. The guide rod 321 moves along the inclined groove 332 driven by the driven disc 32, so that the driven disc 32 drives the driving disc 34 to move downward, and the outer teeth 39 of the driven disc 32 and the active disc 31 gradually move away from each other. During the movement of the driving disk 34, the T-block 35 gradually squeezes the first spring 351 downward. When the T-block 35 abuts the guide surface 421 of the limit block 42, the limit block 42 moves outward under the squeezing of the T-block 35 and drives the limit rod 4 to rotate, so that the torsion spring 411 is twisted and elastically deformed. When the T-block 35 moves to the relative position of the second limit groove 44 and the limit block 42, the limit rod 4 rotates in the direction close to the shaft sleeve 33 under the drive of the elastic force of the torsion spring 411, thereby driving the limit block 42 to insert into the second limit groove 44, limiting the movement of the T-block 35. At this time, the outer teeth 39 of the driven disk 32 and the active disk 31 are separated, cutting off the power transmission of the servo motor 25.

[0063] When power transmission needs to be restored, the servo motor 25 drives the active disk 31 to reverse and controls the reversal speed to be slow. The active disk 31 drives each ratchet 451 to rotate through the core shaft 45. The ratchet 451 clamps the paddle 461 and applies a thrust to the paddle 461, forcing the paddle 461 to drive the support rod 46 to move away from the core shaft 45. The support rod 46 squeezes the corrugated sheet 48 to cause elastic deformation and push the limit rod 4 to rotate. The limit rod 4 drives the limit block 42 to move out of the second limit groove 44, thereby releasing the restriction on the T-block 35. The T-block 35 drives the driving disc 34 to move upward under the elastic force of the first spring 351. The driven disc 32 rotates and moves upward under the drive of the driving disc 34 and the elastic force of the second spring 38 until it contacts the outer teeth 39 of the driven disc 32 and the active disc 31. As the active disc 31 rotates slowly, the outer teeth 39 of the two move relative to each other until they are in meshing state. At this time, the servo motor 25 rotates forward to drive the drill sleeve 14 and the drill rod 15 to rotate.

[0064] like Figure 12 The lifting assembly 8 includes a hoist 81 mounted on the pile driver 1. A steel rope 82 is wound around the drum of the hoist 81. The head of the steel rope 82 passes over the top of the tower 11 and is connected to the slide 12. The tower 11 is rotatably connected to a number of pulleys 83, around which the steel rope 82 passes. When the hoist 81 is started, the drum drives the drum to rotate forward, which reels in the steel rope 82 and moves the slide 12 upward. When the hoist 81 drives the drum in reverse, the drum releases the steel rope 82, and the slide 12 moves downward under the action of gravity.

[0065] The implementation principle of the embodiment of the present application is as follows: the operator connects the top of the drill rod 15 to the slurry pump through a pipeline, starts the servo motor 25 to drive the drill sleeve 14 and the drill rod 15 to rotate, and the drill sleeve 14 and the drill rod 15 rotate in opposite directions, and the drill sleeve 14 and the drill rod 15 drive their respective blades 16 to rotate; the winch 81 drives the roller to release the steel rope 82, so that the slide 12 drives the drill sleeve 14 to descend, and when the drill sleeve 14 moves to the position of the positioning hook 71, the oil cylinder 75 drives the adjustment block 74 to move upward, driving the two positioning hooks 71 to hold the drill sleeve 14, and then the drill sleeve 14 continues to descend, and the two sets of blades 16 cut and drill into the soil; after drilling into a certain depth in the soil, the slurry pump is turned on, and the pressure cement slurry is input into the grouting groove 151 along the pipeline, and then sprayed out from the slurry outlet 152, and the rotating blades 16 mix the cement slurry with the soil. After the drill rod 15 reaches the specified depth, the winch 81 drives the roller to reel in the steel rope 82, and the steel rope 82 pulls the slide 12 upward to pull the drill rod 15 out of the pile hole.

[0066] When the drill sleeve 14 and the drill rod 15 encounter too much resistance during the drilling process or even get stuck and stop, the driven disc 32 and the active disc 31 are separated, and the power of the servo motor 25 is cut off in time. On the one hand, the possibility of overload damage to the servo motor 25 is reduced, and on the other hand, the drilling components such as the drill rod 15 and various power transmission components are protected, reducing the waste of resources caused by component damage.

[0067] like Figure 13 The present application also discloses a construction process for bidirectional cement-soil mixing piles for highway foundations, comprising the following steps: S1. Level the site. Before construction, remove all debris within the construction area. All obstacles below the ground (including stones, tree roots, and garbage, etc.) must be removed. Low-lying areas or ponds on the site should be drained and desilted before backfilling with plain soil (miscellaneous fill soil is not allowed) to the leveling elevation and properly compacted. The compaction degree is required to reach 85%.

[0068] S2. Construction layout and pile position determination: After the original ground is leveled, the first pile position is staked out. At the construction site, the position of each pile is determined using a steel ruler. Bamboo sticks are inserted into the soil to mark the position, and the pile positions are clearly marked with lime. The stake position deviation for each pile should be controlled within 5 cm.

[0069] S3. Align and level pile driver 1: Move pile driver 1 to the designated pile location, center and level it, and use a plumb line to check the verticality of pile driver 1 to ensure that the hole position deviation meets the specifications and the planar position deviation does not exceed ±5cm. Tower 11 and drill rod 15 are vertical, with a verticality deviation of no more than 1.0%.

[0070] S4. Pump the slurry to the nozzle at a pressure of 0.3 MPa. After filtering the prepared slurry through a sieve, pour it into the slurry reservoir and continuously stir to ensure uniformity and prevent segregation. The distance from the slurry reservoir to the pile driver 1 should be less than 60 m. Before pumping the slurry, the pipeline should be kept moist to facilitate slurry delivery. Check the slurry density promptly to ensure it meets the requirements and record the results. Connect the slurry pump to the top of the drill pipe 15 via a pipe.

[0071] S5. Sink the drill rod 15 for spraying and mixing. The drill sleeve 14 and drill rod 15 cut the soil downward along the tower 11. Start the slurry pump 25 cm below the ground surface to spray cement slurry into the soil. The two sets of blades 16 rotate forward and reverse simultaneously to cut and mix the soil until the designed depth is reached. The pile end should continue to spray and mix on site for more than 10 seconds.

[0072] S6, lifting and mixing; turn off the slurry pump, lift the drill sleeve 14 and the drill rod 15, and the two sets of blades rotate forward and reverse at the same time to mix the cement soil until the ground surface or the designed pile top elevation is 50cm above, completing the single pile construction.

[0073] S7, clean the drill rod 15, drill sleeve 14 and blade 16, and move the pile driver 1 to the next pile construction.

[0074] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A bidirectional cement-soil mixing pile for highway foundation, characterized by: The invention comprises a pile driver (1), wherein the pile driver (1) is rotatably connected to a tower (11), the tower (11) is slidably connected to a slide (12), the slide (12) is provided with a transmission box (13), a drill sleeve (14) is rotatably connected in the transmission box (13), a drill rod (15) is coaxially rotatably connected in the drill sleeve (14), the bottom ends of the drill rod (15) and the drill sleeve (14) are both provided with blades (16), the top end of the drill rod (15) is provided with a first gear (21), the top end of the drill sleeve (14) is provided with a second gear (22), a reversing gear (23) and a gear shaft (24) are rotatably connected in the transmission box (13), and the reversing gear (23) is meshed with the first gear (21), the gear shaft (24) is meshed with the reversing gear (23) and the second gear (22) at the same time, a servo motor (25) is installed on the slide (12), the motor shaft of the servo motor (25) is connected to the gear shaft (24) through a transmission component (3), a grouting groove (151) is provided in the drill rod (15), a slurry outlet hole (152) is provided at the bottom of the drill rod (15), a hydraulic cylinder (17) is hinged on the pile driver (1), the piston rod of the hydraulic cylinder (17) is hinged to the side wall of the tower (11), and a lifting component (8) for driving the slide (12) to move is provided on the pile driver (1).

2. The bidirectional cement-soil mixing pile for highway foundation according to claim 1, characterized in that: The transmission assembly (3) includes a driving disc (31) and a driven disc (32). The gear shaft (24) passes through the transmission box (13) and is coaxially connected to a shaft sleeve (33). A driving disc (34) is provided in the shaft sleeve (33). A plurality of circumferentially distributed T-shaped blocks (35) are provided on the driving disc (34). The inner wall of the shaft sleeve (33) is provided with a T-shaped slot (331) for the T-shaped blocks (35) to slide. Each of the T-shaped blocks (35) is connected to the T-shaped slot by a first spring (351). The groove (331) is connected to the bottom of the groove, the driven disk (32) is located on the driving disk (34), and a plurality of arc grooves (36) are provided on the side of the driven disk (32) facing the driving disk (34), and a clamping block (37) is inserted into each of the arc grooves (36), the clamping block (37) is located at one end of the arc groove (36), and the clamping block (37) is connected to the other end of the slide groove through a second spring (38), and a clamping slot (371) for inserting each clamping block (37) is provided on the driving disk (34); The driven disk (32) is provided with a plurality of circumferentially arranged guide rods (321), and the inner wall of the shaft sleeve (33) is provided with an inclined groove (332) for inserting each guide rod (321); The driving disc (31) is located above the driven disc (32) and is connected to the motor shaft of the servo motor (25). The driving disc (31) and the driven disc (32) are provided with mutually meshing external teeth (39) on opposite sides.

3. The bidirectional cement-soil mixing pile for highway foundation according to claim 2, characterized in that: The side wall of the shaft sleeve (33) is hinged to the limit rod (4) through a hinge shaft (41); a torsion spring (411) is sleeved on the hinge shaft (41); a limit block (42) is provided on the side wall of the limit rod (4); a first limit groove (43) communicating with the T-slot (331) is provided on the shaft sleeve (33); the limit block (42) passes through the first limit groove (43) and is inserted into the T-slot (331); an inclined guide surface (421) is provided at the end of the limit block (42); and a second limit groove (44) is provided on the side wall of the T-block (35).

4. The bidirectional cement-soil mixing pile for highway foundation according to claim 3, characterized in that: The bottom surface of the active disk (31) is coaxially connected to a core shaft (45), the core shaft (45) passes through the driven disk (32) and the driving disk (34) and is inserted into the shaft sleeve (33), the bottom end of the core shaft (45) is provided with a plurality of circumferentially distributed ratchet teeth (451), the shaft sleeve (33) is slidably connected with a support rod (46), one end of the support rod (46) passes through the shaft sleeve (33) and abuts against the limit rod (4), the other end is provided with an elastic paddle (461), the paddle (461) is tangent to the ratchet teeth (451), the bottom of the shaft sleeve (33) is provided with a long groove (47) corresponding to the limit rod (4), the long groove (47) is provided with an elastic corrugated sheet (48), one end of the corrugated sheet (48) is connected to the support rod (46), and the other end is connected to the bottom of the long groove (47).

5. The bidirectional cement-soil mixing pile for highway foundation according to claim 4, characterized in that: An intermediate column (57) is provided in the arc groove (36), and screw holes (571) are provided in the intermediate column (57) and the block (37), and a countersunk screw (56) is threadedly connected to the screw hole (571), and washers (58) are fixed at both ends of the second spring (38), and a protrusion (59) is provided on the side wall of the washers (58). A groove (591) for inserting the protrusion (59) is provided on the side wall of the intermediate column (57) and the block (37), and the countersunk screw (56) passes through the protrusion (59), and the countersunk screw (56) corresponding to the intermediate column (57) is threadedly connected to the driven disk (32); The side wall of the clamping block (37) is provided with a first guide groove (51) connected to the screw hole (571), and a guide block (52) is slidably connected in the first guide groove (51). The end of the guide block (52) away from the screw hole (571) is provided with two relatively distributed inclined surfaces (521), and the end of the guide block (52) close to the screw hole (571) is provided with two arc-shaped first elastic pieces (53). The ends of the two first elastic pieces (53) away from the guide block (52) pass into the screw hole (571) and are connected by an arc-shaped second elastic piece (54). The first elastic piece (53) abuts against the edge of the notch of the first guide groove (51), and the groove wall of the arc groove (36) is provided with a second guide groove (55) for the guide block (52) to slide, and the second guide groove (55) is adapted to the two inclined surfaces (521) on the guide block (52).

6. The bidirectional cement-soil mixing pile for highway foundation according to claim 1, characterized in that: The transmission box (13) is fixed on the slide (12) by screws. A base (6) is slidably connected inside the slide (12). The base (6) is fixed to the slide (12) by bolts. A waist-shaped groove (61) for the bolt to pass through is opened on the base (6).

7. The bidirectional cement-soil mixing pile for highway foundation according to claim 1, characterized in that: A positioning plate (7) is provided in one end of the tower (11) close to the pile driver (1), and two positioning hooks (71) are hinged on the positioning plate (7). A stop block (72) is provided between the two positioning hooks (71) on the positioning plate (7). A support (73) is vertically provided on the positioning plate (7), and an adjustment block (74) is slidably connected to the support (73). An adjustment rod (741) corresponding to the positioning hook (71) is ball-hinged on the adjustment block (74), and one end of the adjustment rod (741) away from the adjustment block (74) is ball-hinged with the positioning hook (71). An oil cylinder (75) is installed in the tower (11), and a piston rod of the oil cylinder (75) is connected to the adjustment block (74).

8. The bidirectional cement-soil mixing pile for highway foundation according to claim 7, characterized in that: The lifting assembly (8) comprises a winch (81) and a steel rope (82). The winch (81) is installed on the pile driver (1). The steel rope (82) is wound on a roller of the winch (81). The head of the steel rope (82) is connected to a slide seat (12). A pulley (83) for the steel rope (82) to pass around is rotatably connected to the tower (11).

9. A construction process for bidirectional cement-soil mixing piles for highway foundation, characterized by: The process includes the following steps: S1, leveling the site; S2, laying out the construction line and determining the pile position; S3, aligning and leveling the pile driver; S4, delivering slurry to the nozzle with the pressure set to 0.3 MPa; S5, lowering the drill rod for spraying and mixing; S6, lifting and mixing; S7, cleaning the drill rod, drill sleeve and blade, and moving the pile driver to the next pile construction.

10. The bidirectional cement-soil mixing pile for highway foundation according to claim 9, characterized in that: The drill rod is 25 cm below the ground surface and the slurry pump is turned on to spray cement slurry into the soil. When the drill rod reaches the designed depth, the slurry is stirred for more than 10 seconds.

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