Bidirectional mixing drill with diameter expansion function and construction method

Abstract

The present invention provides a bidirectional mixing drill with a diameter expansion function for a mixing pile machine, comprising a diameter reducing mechanism, a drill rod assembly, a bidirectional mixing drill bit, a hydraulic mechanism, a power unit, a suspension assembly, and a grouting unit; the upper and lower ends of the two sets of hydraulic mechanisms are respectively fixedly connected to the upper and lower support plates on both sides of the suspension assembly, the upper and lower support plates on both sides are respectively fixedly connected to the upper power head and the lower power head, and a diameter reducing mechanism is provided on the outer drill rod; the hydraulic mechanism is used to drive the diameter reducing mechanism to change the diameter, and the diameter reducing mechanism moves circumferentially under the power of the power unit, thereby changing the hole diameter of the drill tool, and a grouting port is also provided in the diameter reducing mechanism. The present invention also provides a construction method for a bidirectional mixing drill with a diameter expansion function. In the present invention, the diameter change amount of the bidirectional mixing pile can be accurately controlled by the hydraulic system, and the grouting port in the diameter reducing mechanism can be used to realize pressure grouting of the diameter changing part, and finally realize the local diameter expansion of the bidirectional mixing pile in any pile section.

Description

Technical Field

[0001] The invention belongs to the technical field of curing agent mixing pile construction, and in particular relates to an expanded diameter bidirectional mixing drill tool and a construction method. Background Art

[0002] Soft soil foundation treatment in building foundation engineering is a critical step in ensuring project quality and accounts for a significant portion of the total project cost. Numerous engineering projects have demonstrated that the cement-soil mixing pile method offers advantages such as ease of construction, speed, and minimal vibration. It effectively improves the stability of soft soil foundations and reduces and controls settlement. Cement-soil mixing piles have become a commonly used method for treating soft soil foundations, widely used in foundation pit support and foundation treatment.

[0003] Existing conventional mixing pile machines are generally unidirectional mixing pile machines, which have the problems of single mixing direction, slurry coming out of the ground, uneven mixing, easy blockage of the drill rod, poor pile quality, and low pile efficiency. In addition, many foundations have soil layers of different textures, and the bearing capacity of the foundations of different soil layers is also different, requiring mixing piles of different pile diameters. In the design of foundation pit support, the actual upper side pressure load of the soil is much smaller than the lower load, and mixing piles of different pile diameters are also required. If all construction is carried out according to the small pile diameter, the strength of the cement soil mixing pile is insufficient, which leads to safety accidents; if all construction is carried out according to the large pile diameter, a large amount of curing agent is wasted and the cost increases. Traditional variable cross-section piles have the problem that the variable diameter blades cannot be fully opened, resulting in failure to complete the variable diameter construction according to the design requirements, and can only achieve two pile diameters, and the operation steps are cumbersome. Summary of the Invention

[0004] In order to overcome at least one defect in the prior art, the present invention proposes a bidirectional mixing drill with a diameter expansion function, which can realize bidirectional rotary mixing, and the mixing pile can achieve rapid and infinite diameter change according to demand, effectively improving the quality of the mixing pile.

[0005] In order to solve the above technical problems, the present invention provides a two-way stirring drill tool with a diameter expansion function, comprising a diameter-changing mechanism, a drill rod assembly, a two-way stirring drill bit, a hydraulic mechanism, a power unit, a suspension assembly and a grouting unit. The drill rod assembly comprises a hollow outer drill rod, an inner drill rod and a central tube with successively decreasing diameters; the power unit comprises an upper power head and a lower power head, the upper end of the outer drill rod is fixedly connected to the lower end of the lower power head, and the upper end of the inner drill rod is fixedly connected to the lower end of the upper power head; the upper and lower ends of the hydraulic mechanism are respectively fixedly connected to the double-sided upper supporting plates and the double-sided lower supporting plates of the suspension assembly; the double-sided upper supporting plates and the double-sided lower supporting plates are respectively fixedly connected to the upper power head and the lower power head; the diameter-changing mechanism is movable The hydraulic mechanism is arranged on the outer drill rod, and is used to drive the double-sided lower support plates to approach or move away from the double-sided upper support plates to drive the lower power head to approach or move away from the upper power head, so that the outer drill rod and the inner drill rod are relatively close to or away from each other in the axial direction, so as to realize the diameter-changing mechanism to approach or move away from the axial centerline direction of the drill rod assembly in the radial direction; and the drill rod assembly drives the diameter-changing mechanism to move circumferentially along the drill rod assembly under the driving action of the power unit to change the diameter of the diameter-changing mechanism; the bidirectional stirring drill bit is detachably connected to the lower end of the drill rod assembly, and realizes bidirectional stirring under the rotation action of the outer drill rod and the inner drill rod, and the grouting unit is respectively connected to the diameter-changing mechanism and the bidirectional stirring drill bit.

[0006] Furthermore, the variable diameter mechanism includes an annular connecting seat and at least two variable diameter blades; the outer drill rod includes a first outer drill rod and a second outer drill rod, the first outer drill rod and the inner drill rod can rotate relative to each other in the circumferential direction and can slide in the axial direction, the second outer drill rod and the inner drill rod can rotate relative to each other in the circumferential direction, the annular connecting seat includes an annular upper connecting seat connected to the bottom end of the first outer drill rod and an annular lower connecting seat connected to the top of the second outer drill rod; each of the variable diameter blades includes an upper variable diameter blade and a lower variable diameter blade; the upper end of the upper variable diameter blade is hinged to the annular upper connecting seat, the lower end of the lower variable diameter blade is hinged to the annular lower connecting seat, and the lower end of the upper variable diameter blade is hinged to the upper end of the lower variable diameter blade.

[0007] As an improved structure, a plurality of torque transmission rods extending axially thereof are provided on the outer peripheral wall of the annular lower connecting seat, and a plurality of torque transmission rod seats are correspondingly provided on the outer peripheral wall of the annular upper connecting seat, and the upper end of each torque transmission rod is slidably fitted in the corresponding torque transmission rod seat.

[0008] As another improved structure, the lower end of the first outer drill rod is connected to an external hexagonal torque transmission male joint, the upper end of the second outer drill rod is connected to an internal hexagonal torque transmission female joint, and the lower end of the external hexagonal torque transmission male joint can be slidably inserted into the internal hexagonal torque transmission female joint along the axial direction.

[0009] Furthermore, an oil-free bushing is provided in the annular gap between the outer drill rod and the inner drill rod, and the oil-free bushing includes an upper oil-free bushing arranged between the lower end of the first outer drill rod and the outer wall of the inner drill rod, and a lower oil-free bushing arranged between the top of the second outer drill rod and the outer wall of the inner drill rod; and the outer ring of the upper oil-free bushing is fixedly connected to the first outer drill rod, and the inner ring is axially slidingly matched with the inner drill rod; the outer ring of the lower oil-free bushing is fixedly connected to the second outer drill rod, and the inner ring is circumferentially rotatable relative to the outer wall of the inner drill rod.

[0010] Furthermore, the bidirectional mixing drill bit includes an outer tube fixedly connected to the lower end of the outer drill rod and an inner tube fixedly connected to the lower end of the inner drill rod; a first mixing blade is connected to the outer wall of the inner tube, an outer frame is connected to the outer tube, a second mixing blade is provided on the inner wall of the outer frame, and the second mixing blade and the first mixing blade can rotate relative to each other without interfering with each other; the bottom end of the inner tube is connected to a tunneling wing.

[0011] Furthermore, the grouting unit includes a first grouting channel arranged between the outside of the central tube and the inner wall of the inner drill rod, and a second grouting channel arranged inside the central tube; a first grouting port connected to the first grouting channel is opened at a position corresponding to the reducing mechanism on the outer wall of the inner drill rod; and a third grouting port connected to the second grouting channel is provided on the excavation wing.

[0012] Furthermore, the hydraulic mechanism includes a hydraulic pump station and two hydraulic cylinders; the hydraulic pump station is fixedly connected under the upper cover plate of the suspension assembly to provide power to the hydraulic cylinders, and the control system of the hydraulic pump station is integrated into the pile driver cab control panel through an electromagnetic valve; the upper and lower ends of the two hydraulic cylinders are respectively connected to the double-sided upper support plates and the double-sided lower support plates.

[0013] Furthermore, the hydraulic mechanism also includes a guide mechanism, which includes an upper guide seat, a guide shaft and a lower guide seat. The upper guide seat and the lower guide seat are respectively fixedly connected to the double-sided upper support plates and the double-sided lower support plates; the lower end of the guide shaft is fixedly connected to the lower guide seat, and the upper end is slidably connected to the upper guide seat.

[0014] In addition, the present invention also provides a construction method for the above-mentioned bidirectional stirring drill with a diameter expansion function, and its construction process includes the following standard steps:

[0015] S1: Level the site to be constructed;

[0016] S2: transporting the pile driver with a bidirectional mixing drill with an expansion function to the construction site, positioning and centering the pile according to the set pile position, and connecting the grouting pump and the faucet, wherein the faucet includes three faucets connected to the first grouting channel, the second grouting channel, and the third grouting channel respectively;

[0017] S3: Start the pile driver and grouting pump, control the drilling rig power unit through the mixing drilling rig operation module according to the preset construction parameters, apply clockwise and counterclockwise torque and vertical drilling pressure to the upper and lower power heads respectively, and perform bidirectional mixing pile construction according to the preset construction parameters. During the drilling and mixing process, according to the design requirements, the hydraulic mechanism may not be started, or the hydraulic mechanism may be remotely started once to drive the inner drill rod and the outer drill rod to move relative to each other in the axial direction, or the hydraulic mechanism may be remotely started multiple times to drive the inner drill rod and the outer drill rod to move relative to each other in the axial direction, and pressure grouting may be performed in the expanded diameter pile section until the drilling and mixing reaches the designed depth;

[0018] S4: After reaching the designed depth, the drilling rig power unit is controlled through the mixing drill operation module according to the preset construction parameters, and clockwise and counterclockwise torques and lifting forces are applied to the upper and lower power heads to carry out secondary mixing of the pile during the upward phase of the drilling rig; during the drilling and mixing process, according to the design requirements, the hydraulic mechanism may not be started, or the hydraulic mechanism may be remotely started once to drive the inner drill rod and the outer drill rod to move relative to each other in the axial direction, or the hydraulic mechanism may be remotely started multiple times to drive the inner drill rod and the outer drill rod to move relative to each other in the axial direction, and pressure grouting may be carried out in the expanded diameter pile section until the drilling and mixing are completed to the ground;

[0019] S5: End the construction of the mixing pile, move the drilling rig to the next pile position, and repeat the above steps.

[0020] Compared with the prior art, the bidirectional stirring drill tool and the construction method thereof of the present invention have the following technical effects:

[0021] 1. Based on the bidirectional mixing drill with diameter expansion function and the multi-layer bidirectional mutual shear mixing method, it solves the inherent problems of traditional unidirectional mixing drills, such as uneven mixing, surface slurry, drill sticking, low pile strength, high material consumption, and long construction time. While reducing material consumption and shortening construction period, it can greatly improve the uniformity and pile strength of bidirectional mixing piles, and comprehensively improve construction quality.

[0022] 2. Traditional variable-section piles have the problem that the variable-diameter blades cannot be fully opened, which often leads to failure to complete the variable-diameter construction as required by the design, and only two pile diameters can be achieved. The present invention provides a bidirectional mixing drill with a diameter expansion function, which adopts a hydraulic system to eliminate the problem of insufficient diameter change, and the diameter-changing mechanism can flexibly deform and adjust the diameter expansion size to achieve infinite diameter change; in the process of forming the expanded-diameter bidirectional mixing piles, by combining the bidirectional mixing technology with the diameter expansion mechanical cutting and mixing technology, the diameter expansion mechanism can be used to implement mechanical cutting, mixing and diameter expansion of the mixing piles according to the pile body position and pile body shape design.

[0023] 3. The present invention provides a bidirectional mixing drill with a diameter expansion function. The control system is integrated into the cockpit control panel through an electromagnetic valve, which can make the diameter change process controllable and visible, convenient and fast. By adopting the operation control (module) technology, the pile construction parameters are pre-set, and the pile depth and diameter expansion parameters are controlled in real time. The diameter expansion of different diameters can be implemented at the top or bottom of the pile body and any pile section in the middle. The amount of curing agent added to different diameter expansion bodies can also be adjusted through the grouting control technology. The diameter-changing bidirectional mixing piles with variable sizes, shaped like candied haws, can be constructed, thereby achieving the purpose of adjusting the strength of different pile sections and improving the bearing capacity of the entire pile.

[0024] 4. The machine device of the present invention avoids the drawbacks of traditional mechanical expansion-diameter mixing pile drilling tools, such as complex opening and closing operations, fragile components, time-consuming use, and high failure rate, which are difficult to solve. In addition, it also completely solves the technical problem that traditional mechanical expansion-diameter mixing pile drilling tools cannot achieve diameter expansion at the bottom of a bidirectional mixing pile.

[0025] In addition, other improved features and advantages of the present invention will be described in the following detailed description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a front view of the structure of the bidirectional stirring drill with a diameter expansion function in an open state of the present invention;

[0027] Figure 2 This is an axial view of the structure of the bidirectional stirring drill with a diameter expansion function in an open state of the present invention;

[0028] Figure 3 This is a front view of the closed state structure of the bidirectional stirring drill with a diameter expansion function of the present invention;

[0029] Figure 4 This is an axial view from another angle of the bidirectional stirring drill with a diameter expansion function of the present invention in an open state;

[0030] Figure 5This is a cross-sectional view of the bidirectional stirring drill with a diameter expansion function of the present invention in an open state;

[0031] Figure 6 It is a partial cross-sectional view of the diameter-changing mechanism in the present invention;

[0032] Figure 7 This is a schematic diagram of the variable diameter mechanism in the present invention in an open state;

[0033] Figure 8 This is a schematic diagram of the hydraulic mechanism of the bidirectional stirring drill with a diameter expansion function of the present invention in an open state;

[0034] Figure 9 This is a schematic structural diagram of a bidirectional stirring drill bit of a bidirectional stirring drill tool with a diameter expansion function according to the present invention;

[0035] Figure 10 Schematic diagram of the open state of the second embodiment of the bidirectional stirring drill with a diameter expansion function of the present invention;

[0036] Figure 11 This is a schematic diagram of the explosion structure of the variable diameter drill pipe of the second embodiment of the bidirectional stirring drill tool with a diameter expansion function of the present invention;

[0037] Figure 12 This is a vertical cross-sectional view of the second embodiment of the bidirectional stirring drill with a diameter expansion function of the present invention in an open state;

[0038] Figure 13 yes Figure 12 Middle AA section;

[0039] Figure 14 yes Figure 12 Middle BB cross-section;

[0040] Figure 15 yes Figure 12 mid-CC cross-section;

[0041] Figure 16 This is an axial view of the structure of the bidirectional stirring drill with diameter expansion function in the open state according to the third embodiment of the present invention;

[0042] Figure 17 This is a partial cross-sectional view of the diameter-changing mechanism of the third embodiment of the bidirectional stirring drill with a diameter-expanding function of the present invention;

[0043] Figure 18 It is a transverse cross-sectional view of the drill rod assembly according to the third embodiment of the present invention.

[0044] As shown in the figure:

[0045] 1. Reducer; 2. Drill rod assembly; 3. Central tube; 4. Inner drill rod; 5. Outer drill rod; 5.1. First outer drill rod; 5.2. Second outer drill rod; 6. Grouting unit; 6.1. First grouting channel; 6.2. Second grouting channel; 6.3. Third grouting channel; 7. Oil-free bushing; 7.1. Upper oil-free bushing; 7.2. Lower oil-free bushing; 8. Annular connector; 8.1. Upper annular connector; 8.2. Lower annular connector. 9. Variable diameter blade; 9.1. Upper variable diameter blade; 9.2. Lower variable diameter blade; 10. Hinge support; 10.1. First hinge support; 10.2. Second hinge support; 10.3. Third hinge support; 11. Upper support plates on both sides; 12. Lower support plates on both sides; 14. Guide plate; 14.1. Upper sliding guide plate; 14.2. Lower sliding guide plate; 15. Upper power head; 16. Lower power head; 19. Guide mechanism; 19 .1, upper guide seat; 19.2, guide shaft; 19.3, lower guide seat; 20, upper cover plate; 30, hydraulic mechanism; 31, hydraulic pump station; 32, hydraulic cylinder; 33, hydraulic cylinder connecting seat; 33.1, hydraulic cylinder upper connecting seat; 33.2, hydraulic cylinder lower connecting seat; 34, first spraying port; 35, second spraying port; 36, third spraying port; 37, first faucet; 38, second faucet; 39, third faucet Head; 40. Shotcrete pipe; 42. Bidirectional mixing drill bit; 42.1. Outer frame; 42.2. First mixing blade; 42.3. Second mixing blade; 42.4. Tunneling blade; 43. Flexible tube; 45. Outer tube; 46. Inner tube; 50. Torque transmission mechanism; 50.1. Upper support of torsion transmission rod; 50.2. Torsion transmission rod; 50.3. Lower support of torsion transmission rod; 50.4. External hexagonal torque transmission male connector; 50.5. Internal hexagonal torque transmission female connector. DETAILED DESCRIPTION

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] In the description of the invention, it should be noted that the orientations or positional relationships indicated by the terms "upper end", "lower end", "outer side wall", etc. are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the invention.

[0048] In the description of the invention, it should be noted that, unless otherwise expressly specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the invention based on the specific circumstances.

[0049] Example 1:

[0050] like Figure 1-9 As shown: The present invention provides a bidirectional stirring drill tool with a diameter expansion function, including a diameter reducing mechanism 1, a drill rod assembly 2, a bidirectional stirring drill bit 42, a hydraulic mechanism 30, a power unit, a suspension assembly and a grouting unit 6. The drill rod assembly 2 includes an outer drill rod 5, an inner drill rod 4 and a central tube 3. The outer drill rod 5, the inner drill rod 4 and the central tube 3 are all hollow structures and the diameters decrease successively; the power unit includes an upper power head 15 and a lower power head 16. The upper end of the outer drill rod 5 is fixedly connected to the lower end of the lower power head 16, and the upper end of the inner drill rod 4 is fixedly connected to the lower end of the upper power head 15; the upper and lower ends of the hydraulic mechanism 30 are respectively fixedly connected to the upper support plates 11 and the lower support plates 12 on both sides of the suspension assembly; the upper support plates 11 and the lower support plates 12 on both sides are respectively fixedly connected to the upper power head 15 and the lower power head 16; the diameter reducing mechanism 1 is movably arranged on the outer drill rod 5, and the hydraulic mechanism 30 is used to drive the lower support plates 12 on both sides to move closer or farther away The double-sided upper support plates 11 drive the lower power head 16 to approach or move away from the upper power head 15, so that the outer drill rod 5 and the inner drill rod 4 are relatively close to or away from each other in the axial direction, so as to realize that the diameter-changing mechanism 1 is radially close to or away from the axial centerline direction of the drill rod assembly 2; and the drill rod assembly 2 drives the diameter-changing mechanism 1 to move circumferentially along the drill rod assembly 2 under the driving action of the power unit 48 to change the diameter of the diameter-changing mechanism 1, and finally realize the change of the hole diameter of the drill tool; the other bidirectional stirring drill bit 42 is detachably connected to the lower end of the drill rod assembly 2, and realizes bidirectional stirring under the rotation action of the outer drill rod 5 and the inner drill rod 4, and the grouting unit 6 is respectively connected to the diameter-changing mechanism 1 and the bidirectional stirring drill bit 42 to realize stirring and spraying at the same time.

[0051] Specifically, such as Figure 6 、 7As shown, the variable diameter mechanism 1 includes an annular connecting seat 8 and at least two variable diameter blades 9; the outer drill rod 5 includes a first outer drill rod 5.1 and a second outer drill rod 5.2, the first outer drill rod 5.1 and the inner drill rod 4 are rotatable relative to each other in the circumferential direction and slidable in the axial direction, the second outer drill rod 5.2 and the inner drill rod 4 are rotatable relative to each other in the circumferential direction, the annular connecting seat 8 includes an annular upper connecting seat 8.1 connected to the bottom end of the first outer drill rod and an annular lower connecting seat 8.2 connected to the top of the second outer drill rod; each variable diameter blade 9 includes an upper variable diameter blade 9.1 and a lower variable diameter blade 9.2; the upper end of the upper variable diameter blade 9.1 is hinged to the annular upper connecting seat 8.1, the lower end of the lower variable diameter blade 9.2 is hinged to the annular lower connecting seat 8.2, and the lower end of the upper variable diameter blade 9.1 is hinged to the upper end of the lower variable diameter blade 9.2. More specifically, in this embodiment, each hinge is provided with a hinge shaft seat 10, that is, a plurality of first hinge shaft seats 10.1 distributed along its circumference are provided on the outer wall of the annular upper connecting seat 8.1, and the upper end of each upper variable diameter blade 9.1 is rotatably connected to the first hinge shaft seat 10.1. Similarly, the lower end of the upper variable diameter blade 9.1 is rotatably connected to the upper end of the lower variable diameter blade 9.2 through the second hinge shaft seat 10.2, and a plurality of third hinge shaft seats 10.3 distributed along its circumference are provided on the outer wall of the annular lower connecting seat 8.2, and the lower end of each lower variable diameter blade 9.2 is rotatably connected to the corresponding third hinge shaft seat 10.3; the upper variable diameter blade 9.1 and the lower variable diameter blade 9.2 are relatively rotated along the radial direction of the drill rod assembly 2 through the relative movement between the outer drill rod 5 and the inner drill rod 4 to achieve the change and adjustment of the outer diameter of the drill hole.

[0052] On the other hand, in order to realize the torque transmission effect of the diameter-changing mechanism 1 and ensure the stability of drilling, a torque transmission mechanism 50 is further provided in the diameter-changing mechanism 1. In this embodiment, a plurality of torque transmission rods 50.2 extending along the axial direction are provided on the outer peripheral wall of the annular lower connecting seat 8.2. Correspondingly, a plurality of torque transmission rod upper supports 50.1 are provided on the outer peripheral wall of the annular upper connecting seat 8.1. The upper end of each torque transmission rod 50.2 is respectively slidably fitted in the corresponding torque transmission rod upper support 50.1, and the lower end of each torque transmission rod 50.2 is connected to the annular lower connecting seat 8.2 through the torque transmission rod lower support 50.3. Figure 7 shown.

[0053] In addition, in this embodiment, Figure 5 、 6As shown, in order to better ensure smooth relative rotation between the outer drill rod 5 and the inner drill rod 4, an oil-free bushing 7 is provided in the annular gap between the outer drill rod 5 and the inner drill rod 4, and the oil-free bushing 7 includes an upper oil-free bushing 7.1 arranged between the lower end of the first outer drill rod 5.1 and the outer wall of the inner drill rod 4, and a lower oil-free bushing 7.2 arranged between the top of the second outer drill rod 5.2 and the outer wall of the inner drill rod 4; and the outer ring of the upper oil-free bushing 7.1 is fixedly connected to the first outer drill rod 5.1, and the inner ring is axially slidingly matched with the inner drill rod 4; the outer ring of the lower oil-free bushing 7.2 is fixedly connected to the second outer drill rod 5.2, and the inner ring is circumferentially rotatable matched with the outer wall of the inner drill rod 4. In this structure, the inner ring of the upper oil-free bushing 7.1 can be fixedly connected to the outer wall of the inner drill rod 4, and the outer ring can be slidably matched with the first outer drill rod 5.1. The corresponding inner ring of the lower oil-free bushing 7.2 is fixedly connected to the outer wall of the inner drill rod 4, and the outer ring can be relatively rotatably matched with the second outer drill rod 5.2 along the circumferential direction.

[0054] On the other hand, Figure 2 、 3 As shown in Figure 9, the bidirectional mixing drill bit in the above structure includes an outer tube 45 fixedly connected to the lower end of the outer drill rod 5 and an inner drill rod 46 fixedly connected to the lower end of the inner drill rod 4; a first mixing blade 42.2 is connected to the outer wall of the inner drill rod 46, an outer tube 45 is connected to an outer frame 42.1, and a second mixing blade 42.3 is provided on the inner wall of the outer frame 42.1, and the second mixing blade 42.3 and the first mixing blade 42.2 can rotate relative to each other without interfering with each other. The outer drill rod 5 and the inner drill rod 4 rotate relative to each other under the action of the power unit 48, thereby driving the bidirectional mixing drill bit 42 to stir in both directions; in addition, a tunneling wing 42.4 is connected to the bottom end of the inner tube to further enhance the rotary stirring effect and ensure the quality of the mixing pile.

[0055] In addition, such as Figure 6 、 13 As shown, the grouting unit 6 includes a first grouting channel 6.2 arranged between the outside of the central tube 3 and the inner wall of the inner drill rod 4, and a second grouting channel 6.2 arranged in the central tube 3; a first grouting port 34 connected to the first grouting channel 6.1 is provided on the outer wall of the inner drill rod 4 at a position corresponding to the diameter-changing mechanism 1; in addition, at least one grouting port is provided in the bidirectional stirring drill bit 42, which can be provided on the first stirring blade 42.2 or the excavation blade 42.4, and the cross-sectional form of the grouting port can be circular, square, diamond-shaped or other forms. In addition, a second grouting port 35 connected to the first grouting channel 6.1 can be provided on the outer wall of the inner tube 46; a third grouting port 36 connected to the second grouting channel 6.3 is provided on the excavation blade 42.4. More specifically, a first faucet 37 connected to the first grouting channel 6.1 and a second faucet 38 connected to the second grouting channel 6.2 are provided on the upper power head 15, as shown in FIG. Figure 2 shown.

[0056] like Figure 2 、 4 As shown in Figure 8, the hydraulic mechanism 30 includes a hydraulic pump station 31 and two hydraulic cylinders 32; the hydraulic pump station 31 is fixedly connected to the bottom of the upper cover plate 20 of the suspension assembly 47 for providing power to the hydraulic cylinders 32, and the control system of the hydraulic pump station 31 is integrated into the control panel of the pile driver's cabin through an electromagnetic valve; the upper and lower ends of the two hydraulic cylinders 32 are respectively connected to the upper support plates 11 and the lower support plates 12 on both sides through hydraulic cylinder connecting seats 33; specifically, a hydraulic cylinder upper connecting seat 33.1 for connecting the upper ends of the two hydraulic cylinders 32 is provided on the upper support plates 11 on both sides, and a hydraulic cylinder lower connecting seat 33.2 for connecting the lower ends of the two hydraulic cylinders 32 is provided on the lower support plates 12 on both sides.

[0057] In order to ensure the stability of the relative movement between the upper and lower power heads, the hydraulic mechanism 30 in the above structure also includes a guide mechanism 19, which includes an upper guide seat 19.1, a guide shaft 19.2 and a lower guide seat 19.3. The upper guide seat 19.1 and the lower guide seat 19.3 are fixedly connected to the upper support plates 11 and the lower support plates 12 on both sides respectively; the lower end of the guide shaft 19.2 is fixedly connected to the lower guide seat 19.3, and the upper end is slidably connected to the upper guide seat 19.1, as shown in FIG. Figure 2 、 4 and 8.

[0058] In the above structure, the suspension assembly is slidably matched with the guide assembly of the pile driver through the guide back plate 14. Specifically, the guide back plate 14 includes an upper sliding guide back plate 14.1 and a lower sliding guide back plate 14.2. In addition, one end of the double-sided upper support plate 11 is respectively connected to both sides of the upper sliding guide back plate 14.1, and one end of the double-sided lower support plate 12 is respectively connected to both sides of the lower sliding guide back plate 14.2. Figure 2 shown.

[0059] Example 2:

[0060] like Figure 10-15 As shown, the general structure of this embodiment is the same as that of the first embodiment, and the only difference is the specific form of the torque transmission mechanism 50. In this embodiment, an external hexagonal torque transmission male connector 50.4 is connected to the lower end of the first outer drill rod 5.1, and an internal hexagonal torque transmission female connector 50.5 is connected to the upper end of the second outer drill rod 5.2. The lower end of the external hexagonal torque transmission male connector 50.4 is axially slidably inserted into the internal hexagonal torque transmission female connector 50.5, and torque transmission is achieved through a polygonal insertion structure, which has a simple structure and stable torque transmission.

[0061] Example 3:

[0062] like Figure 16 、 17As shown in Figure 18, the general structure of this embodiment is the same as that of Example 1. The only difference is that in this embodiment, the grouting unit 6 can also include a third grouting channel 6.3 arranged between the outer wall of the inner drill rod 4 and the inner wall of the first outer drill rod 5.1, and a third faucet 39 connected to the third grouting channel 6.3 is arranged on the lower power head 16, and a grouting pipe 40 connected to the third grouting channel 6.3 is arranged on the inner wall of the upper variable diameter blade 9.1, and the grouting pipe 40 is connected to the third grouting channel 6.3 at one end close to the first outer drill rod 5.1 through a flexible tube 43. The outlet of the grouting pipe 40 replaces the first grouting port 34 in Example 1.

[0063] In addition, the upper oil-free bushing 7.1 in this embodiment can only be installed in the form of an outer ring fixedly connected to the first outer drill rod 5.1, and an inner ring slidingly fitting with the inner drill rod 4 along the axial direction; the connection form of the lower oil-free bushing 7.2 is the same as that of the first embodiment.

[0064] On the other hand, the present invention also discloses a pile construction method using a bidirectional stirring drill with a diameter expansion function, the construction process of which comprises the following steps:

[0065] S1: Level the site to be constructed;

[0066] S2: transport the pile driver with a bidirectional mixing drill with an expansion function to the construction site, position and center the pile according to the set pile position, and connect the grouting pump and the faucet;

[0067] S3: Start the pile driver and grouting pump, and control the drilling rig power unit 48 through the mixing drilling rig operation module according to the preset construction parameters, apply clockwise and counterclockwise torques and vertical drilling pressure to the upper and lower power heads respectively, and perform bidirectional mixing pile construction according to the preset construction parameters. During the drilling and mixing process, according to the design requirements, the hydraulic mechanism 30 may not be started, or the hydraulic mechanism 30 may be remotely started once to drive the inner drill rod 4 and the outer drill rod 5 to move relative to each other in the axial direction, or the hydraulic mechanism 30 may be remotely started multiple times to drive the inner drill rod 4 and the outer drill rod 5 to move relative to each other in the axial direction until the drilling and mixing reaches the designed depth;

[0068] S4: After reaching the designed depth, the drilling rig power unit 48 is controlled by the mixing drill operation module according to preset construction parameters, and clockwise and counterclockwise torque and lifting force are applied to the upper and lower power heads to perform secondary mixing of the pile during the drilling rig's upward phase. During the drilling and mixing process, according to design requirements, the hydraulic mechanism 30 may not be activated, or the hydraulic mechanism 30 may be remotely activated once to drive the axial relative movement of the inner drill rod 4 and the outer drill rod 5, or the hydraulic mechanism 30 may be remotely activated multiple times to drive the axial relative movement of the inner drill rod 4 and the outer drill rod 5 until the drilling and mixing are completed;

[0069] S5: End the construction of the mixing pile, move the drilling rig to the next pile position, and repeat the above steps.

[0070] Although the present invention is disclosed as above, the scope of protection disclosed by the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the scope of protection of the invention.

Claims

1. A bidirectional stirring drill tool with a diameter expansion function, comprising a diameter reducing mechanism (1), a drill rod assembly (2), a bidirectional stirring drill bit (42), a hydraulic mechanism (30), a power unit, a suspension assembly and a grouting unit (6), wherein the drill rod assembly (2) comprises a hollow outer drill rod (5), an inner drill rod (4) and a central tube (3), the outer drill rod having successively decreasing diameters; the power unit comprises an upper power head (15) and a lower power head (16), the upper end of the outer drill rod (5) being fixedly connected to the lower end of the lower power head (16), and the upper end of the inner drill rod (4) being fixedly connected to the lower end of the upper power head (15); and characterized in that: The upper and lower ends of the hydraulic mechanism (30) are respectively fixedly connected to the double-sided upper supporting plates (11) and the double-sided lower supporting plates (12) of the suspension assembly; the double-sided upper supporting plates (11) and the double-sided lower supporting plates (12) are respectively fixedly connected to the upper power head (15) and the lower power head (16); the diameter-changing mechanism (1) is movably arranged on the outer drill rod (5), and the hydraulic mechanism (30) is used to drive the double-sided lower supporting plates (12) to approach or move away from the double-sided upper supporting plates (11) to drive the lower power head (16) to approach or move away from the upper power head (15), thereby making the outer drill rod (5) and the inner drill rod (4) are relatively close to or far away in the axial direction, so as to realize that the diameter-changing mechanism (1) is close to or far away from the axis direction of the drill rod assembly (2) in the radial direction; and the drill rod assembly (2) drives the diameter-changing mechanism (1) to move circumferentially along the drill rod assembly (2) under the driving action of the power unit to change the diameter of the diameter-changing mechanism (1); the bidirectional stirring drill bit (42) is detachably connected to the lower end of the drill rod assembly (2), and realizes bidirectional rotary stirring under the rotation action of the outer drill rod (5) and the inner drill rod (4), and the grouting unit is respectively connected to the diameter-changing mechanism (1) and the bidirectional stirring drill bit (42).

2. The bidirectional stirring drill with diameter expansion function according to claim 1, characterized in that: The diameter-changing mechanism (1) comprises an annular connecting seat (8) and at least two diameter-changing blades (9); the outer drill rod (5) comprises a first outer drill rod (5.1) and a second outer drill rod (5.2); the first outer drill rod (5.1) and the inner drill rod (4) are relatively rotatable in the circumferential direction and slidable in the axial direction; the second outer drill rod (5.2) and the inner drill rod (4) are relatively rotatable in the circumferential direction; the annular connecting seat (8) comprises an annular upper connecting seat ( 8.1) and an annular lower connecting seat (8.2) connected to the top of the second outer drill rod (5.2); each of the variable diameter blades (9) comprises an upper variable diameter blade (9.1) and a lower variable diameter blade (9.2); the upper end of the upper variable diameter blade (9.1) is hinged to the annular upper connecting seat (8.1), the lower end of the lower variable diameter blade (9.2) is hinged to the annular lower connecting seat (8.2), and the lower end of the upper variable diameter blade (9.1) is hinged to the upper end of the lower variable diameter blade (9.2).

3. The bidirectional stirring drill with diameter expansion function according to claim 2, characterized in that: A plurality of torque transmission rods (50.2) extending axially thereof are provided on the outer peripheral wall of the annular lower connecting seat (8.2), and a plurality of torque transmission rod upper supports (50.1) are correspondingly provided on the outer peripheral wall of the annular upper connecting seat (8.1), and the upper ends of the respective torque transmission rods (50.2) are slidably fitted in the corresponding torque transmission rod upper supports (50.1).

4. The bidirectional stirring drill with diameter expansion function according to claim 2, characterized in that: The lower end of the first outer drill rod (5.1) is connected to an external hexagonal torque transmission male connector (50.4), the upper end of the second outer drill rod (5.2) is connected to an internal hexagonal torque transmission female connector (50.5), and the lower end of the external hexagonal torque transmission male connector (50.4) is axially slidably inserted into the internal hexagonal torque transmission female connector (50.5).

5. The bidirectional stirring drill with a diameter expansion function according to any one of claims 2 to 4, characterized in that: An oil-free bushing (7) is provided in the annular gap between the outer drill rod (5) and the inner drill rod (4), and the oil-free bushing (7) comprises an upper oil-free bushing (7.1) provided between the lower end of the first outer drill rod (5.1) and the outer wall of the inner drill rod (4), and a lower oil-free bushing (7.2) provided between the top of the second outer drill rod (5.2) and the outer wall of the inner drill rod (4); the outer ring of the upper oil-free bushing (7.1) is fixedly connected to the first outer drill rod (5.1), and the inner ring is axially slidingly engaged with the inner drill rod (4); the outer ring of the lower oil-free bushing (7.2) is fixedly connected to the second outer drill rod (5.2), and the inner ring is circumferentially rotatably engaged with the outer wall of the inner drill rod (4).

6. The bidirectional stirring drill with diameter expansion function according to claim 2, characterized in that: The bidirectional stirring drill bit comprises an outer tube (45) fixedly connected to the lower end of the outer drill rod (5) and an inner tube (46) fixedly connected to the lower end of the inner drill rod (4); a first stirring blade (42.2) is connected to the outer wall of the inner tube (46); an outer frame (42.1) is connected to the outer tube (45); a second stirring blade (42.3) is provided on the inner wall of the outer frame (42.1), and the second stirring blade (42.3) and the first stirring blade (42.2) can rotate relative to each other without interfering with each other; and a tunneling wing (42.4) is connected to the bottom end of the inner tube (46).

7. The bidirectional stirring drill with a diameter expansion function according to claim 6, characterized in that: The grouting unit (6) comprises a first grouting channel (6.1) arranged between the outside of the central pipe (3) and the inner wall of the inner drill rod (4), and a second grouting channel (6.2) arranged in the central pipe (3); a first grouting port (34) communicating with the first grouting channel (6.1) is provided on the outer wall of the inner drill rod (4) at a position corresponding to the diameter-changing mechanism (1); and a third grouting port (36) communicating with the second grouting channel (6.2) is provided on the tunneling wing (42.4).

8. The bidirectional stirring drill with a diameter expansion function according to claim 1, characterized in that: The hydraulic mechanism (30) comprises a hydraulic pump station (31) and two hydraulic cylinders (32); the hydraulic pump station (31) is fixedly connected below the upper cover plate (23) of the suspension assembly to provide power to the hydraulic cylinders (32), and the control system of the hydraulic pump station (31) is integrated into the control panel of the pile driver's cabin through a solenoid valve; the upper and lower ends of the two hydraulic cylinders (32) are respectively connected to the double-sided upper support plates (11) and the double-sided lower support plates (12).

9. The bidirectional stirring drill with a diameter expansion function according to claim 8, characterized in that: The hydraulic mechanism (30) further comprises a guide mechanism (19), the guide mechanism (19) comprising an upper guide seat (19.1), a guide shaft (19.2) and a lower guide seat (19.3), the upper guide seat (19.1) and the lower guide seat (19.3) being fixedly connected to the upper support plates (11) and the lower support plates (12) on both sides, respectively; the lower end of the guide shaft (19.2) is fixedly connected to the lower guide seat (19.3), and the upper end is slidably connected to the upper guide seat (19.1).

10. A construction method of a bidirectional stirring drill with a diameter expansion function according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Level the site to be constructed; S2: transporting the pile driver with a bidirectional mixing drill with an expansion function to the construction site, positioning and centering the pile according to the set pile position, and connecting the grouting pump and the faucet, wherein the faucet includes three faucets connected to the first grouting channel, the second grouting channel, and the third grouting channel respectively; S3: starting the pile driver and the grouting pump, controlling the drilling rig power unit through the mixing drilling rig operation module according to the preset construction parameters, applying clockwise and counterclockwise torques and vertical drilling pressure to the upper and lower power heads respectively, and performing bidirectional mixing pile construction according to the preset construction parameters. During the drilling and mixing process, according to the design requirements, the hydraulic mechanism (30) may not be started, or the hydraulic mechanism (30) may be remotely started once to drive the inner drill rod (4) and the outer drill rod (5) to move relative to each other in the axial direction, or the hydraulic mechanism (30) may be remotely started multiple times to drive the inner drill rod (4) and the outer drill rod (5) to move relative to each other in the axial direction, and pressure grouting may be performed in the expanded diameter pile section until the drilling and mixing reaches the designed depth; S4: After reaching the designed depth, the drilling rig power unit (48) is controlled by the mixing drilling rig operation module according to the preset construction parameters, and clockwise and counterclockwise torques and lifting forces are applied to the upper and lower power heads to perform secondary mixing of the mixing pile in the drilling rig upward stage; during the drilling and mixing process, according to the design requirements, the hydraulic mechanism (30) may not be started, or the hydraulic mechanism (30) may be remotely started once to drive the inner drill rod (4) and the outer drill rod (5) to move relative to each other in the axial direction, or the hydraulic mechanism (30) may be remotely started multiple times to drive the inner drill rod (4) and the outer drill rod (5) to move relative to each other in the axial direction, and pressure grouting may be performed in the expanded diameter pile section until the drilling and mixing are completed to the ground; S5: End the construction of the mixing pile, move the drilling rig to the next pile position, and repeat the above steps.

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