A stirring blade structure for a drilling tool in the construction of large-diameter mixing piles

Abstract

The present invention relates to a stirring blade structure for a drilling tool in the construction of large-diameter mixing piles, which includes a drill bit center rod. At least one set of stirring blade units is arranged radially on the drill bit center rod, and each set of stirring blade units is arranged along the axial direction of the drill bit center rod; the stirring blade unit includes stirring blade assemblies that are distributed vertically along the axial direction of the drill bit center rod; the stirring blade assembly includes a stirring wing plate and a flow guiding plate. The flow guiding plate is arranged on the upper plate surface and / or the lower plate surface of the stirring wing plate. The stirring wing plate is fixed on the drill bit center rod, and at least two stirring wing plates are provided and are equidistantly distributed around the radial direction of the drill bit center rod; through the forced flow guiding and disturbance of the soil layer by the structure of the present invention, the repeated cutting and stirring effect in the horizontal direction of the pile body can be increased, effectively improving the quality of the mixing pile pile body, construction efficiency, reducing the dosage of the curing agent, etc., and at the same time having characteristics such as its own bending moment and moment balance.

Description

Technical Field

[0001] The invention belongs to the technical field of underground construction machinery and equipment, and particularly relates to a stirring blade structure for a drill tool used in the construction of large-diameter mixing piles. Background Art

[0002] As a main construction method in the field of foundation treatment engineering technology, the deep mixing pile technology has been widely used in the field of engineering construction since the 1960s, including civil engineering, construction engineering, railway engineering, highway engineering, water conservancy engineering, municipal engineering, port engineering and other fields. The deep mixing pile engineering technology uses a single-axis or multi-axis mixing drill to input curing agents such as cement into the ground. By mixing with soft and hard soil bodies, a series of physical and chemical reactions occur between the curing agent and the soil body, generating pile bodies, walls, and blocks with high strength, good water stability, and strong anti-seepage performance. Thus, it effectively solves practical engineering problems such as the bearing capacity of composite foundations, the bearing capacity of mixing piles, the bearing capacity of stiff-core composite piles, the bearing capacity of SMW method piles, the anti-seepage force of cut-off walls, and the sealing partitions and sealing layers of contaminated soil and toxic substance landfills.

[0003] Due to the advantages of simple drill equipment, high construction efficiency, and low cost, the deep mixing pile engineering technology has been widely used in the civil construction field. However, currently, when designing the drill tool for mixing pile construction, slurry (powder) spraying ports are set on the central rod of the drill bit or at a certain position of the stirring blade. The sprayed curing agent will accumulate around the central rod or along a certain circular path, and it is impossible to spread the curing agent to the entire cross-section of the pile body. Even through the stirring of ordinary stirring blades, it is difficult to achieve the goal of uniform stirring. Usually, the curing agent accumulates in some areas, ultimately resulting in serious engineering quality problems such as too high strength of the solidified soil in some positions of the pile body while too low strength in most other areas, and the overall strength of the solidified soil being lower than the design value, and often causing serious engineering safety problems. Especially when large-diameter and deep mixing piles need to be constructed in engineering, when using the drill tool with a conventional stirring blade design for construction, the engineering quality and engineering safety risks will be particularly prominent. Currently, the civil construction market urgently needs to solve the above engineering technical problems. Some existing conventional solutions mainly include: 1. Adopting the four-stirring two-spraying or multi-stirring multi-spraying process to increase the stirring time, and the uniformity is improved to a certain extent, but the construction efficiency is reduced; 2. Increasing the number of stirring blades on the central rod or drill pipe of the drill bit, and the uniformity is improved to a certain extent, but it will greatly increase the torque requirement for the power head of the mixing pile machine and the requirements for the strength of other mechanical structures. Therefore, this problem has not been fundamentally solved in the industry. Summary of the Invention

[0004] The object of the present invention is to overcome the deficiencies existing in the prior art, and to provide a stirring blade structure for a drill for constructing large-diameter mixing piles, so as to achieve sufficient mixing of the curing agent and the soil, greatly improve the mixing uniformity effect, and finally achieve a significant reduction in the strength difference of the mixing pile body and a significant increase in the overall strength.

[0005] The object of the present invention is achieved by the following technical solutions. This stirring blade structure for a drill for constructing large-diameter mixing piles includes a drill bit central rod, and at least one group of stirring blade units is arranged in the radial direction of the drill bit central rod, and each group of stirring blade units is arranged along the axial direction of the drill bit central rod; the stirring blade unit includes stirring blade assemblies arranged up and down along the axial direction of the drill bit central rod; the stirring blade assembly includes a stirring wing plate and a flow guiding plate, the flow guiding plate is arranged on the upper plate surface and / or the lower plate surface of the stirring wing plate, the stirring wing plate is fixed on the drill bit central rod, and at least two stirring wing plates are provided and are equally spaced around the radial direction of the drill bit central rod.

[0006] The beneficial effects of the present invention are as follows: Compared with the prior art, by adopting this structure, regardless of what kind of stirring drill bit and what kind of stirring process, such as single-axis unidirectional mixing piles, single-axis bidirectional mixing piles, double-axis unidirectional mixing piles, double-axis bidirectional mixing piles, multi-axis mixing piles, etc., during the construction process, through the cutting action of the stirring wing plate in the vertical direction of the pile body and the forced disturbance action of the flow guiding plate in the horizontal direction of the pile body, the sprayed curing agent slurry or powder and the soil can have a large displacement in the vertical and horizontal directions, thereby achieving sufficient mixing of the curing agent and the soil, greatly improving the mixing uniformity effect, and finally achieving a significant reduction in the strength difference of the mixing pile body and a significant increase in the overall strength. Using this structure, the construction diameter of the mixing pile can reach 3000 mm.

[0007] Preferably, the flow guiding plate includes a positive flow guiding plate and a reverse flow guiding plate. A number of positive flow guiding plates or reverse flow guiding plates are arranged on the same plate surface of the stirring wing plates at the same cross-sectional height of the drill bit central rod, and on the opposite plate surfaces of the stirring wing plates arranged up and down, a positive flow guiding plate is arranged on the plate surface of one stirring wing plate, and a reverse flow guiding plate is arranged on the plate surface of the other stirring wing plate, and the number of the positive flow guiding plates is equal to the number of the reverse flow guiding plates; such a setting can make the movement direction of the cement soil of the pile body at the same cross-sectional height have consistency and continuity, and at the same time can balance the horizontal acting force of the stirring wing plates on both sides of the drill bit central rod on the drill bit central rod. The total number of the positive flow guiding plates and the reverse flow guiding plates arranged on the same drill is equal, and such a setting can keep the frictional resistance of the soil on the entire drill bit central rod in positive and negative balance.

[0008] Preferably, the deflector is obliquely and vertically fixed on the stirring vane, and the included angle θ between the setting direction of the deflector and the plate surface of the stirring vane ranges from 0 to 45°; through this angle setting, the guiding effect of the deflector is better.

[0009] Preferably, the projection width a of the deflector in the extending direction of the stirring vane and the width b of the stirring vane are in a ratio of 0.5 to 1.5; the effect of the deflector is better, so that the stirring of the stirring vane is more uniform.

[0010] Preferably, the included angle α between the upper plate surface of the stirring vane and the radial horizontal plane of the drill bit center rod ranges from 0 to 45°; it can produce a better shearing and disturbing effect on the soil in front of the plate in the rotation direction, and at the same time, the resistance added to the drill bit is relatively small.

[0011] Preferably, a plurality of positive deflectors are provided and are arranged in a straight line or staggered pattern in sequence along the length direction of the stirring vane, and the adjacent positive deflectors are equally spaced; in this way, the stirring of the stirring vane through the positive deflector is more uniform.

[0012] Preferably, a plurality of reverse deflectors are provided and are arranged in a straight line or staggered pattern in sequence along the length direction of the stirring vane, and the adjacent reverse deflectors are equally spaced; in this way, the stirring of the stirring vane through the reverse deflector is more uniform.

[0013] Preferably, when the deflector is arranged on the upper plate surface or the lower plate surface of the stirring vane, support blocks are provided on the plate surface opposite to the upper plate surface or the lower plate surface of the stirring vane; during the rotation of the drill bit, the soil has a certain horizontal acting force on the deflector, and then generates a certain bending moment on the entire stirring vane. Setting support blocks on the opposite side of the deflector can play a role in balancing the bending moment, and at the same time, it can strengthen the connection between the stirring vane and the drill bit center rod.

[0014] Preferably, a drill bit joint is provided at the upper end of the drill bit center rod, and a free blade, a cutting and grouting blade, and a cutting blade are sequentially provided at the lower end of the drill bit center rod, and the free blade, the cutting and grouting blade, and the cutting blade are all located below the stirring blade unit, and the cutting and grouting blade and the cutting blade are symmetrically distributed at the radial position of the drill bit center rod; making the stirring ability of the entire drill bit better. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the stirring blade assembly of the present invention.

[0016] Figure 2 is a schematic structural diagram of Embodiment 1 of the present invention.

[0017] Figure 3 It is a schematic structural diagram of the first embodiment of the present invention.

[0018] Figure 4 It is a schematic structural diagram of the first embodiment of the present invention.

[0019] Figure 5 It is a schematic structural diagram of the first embodiment of the present invention.

[0020] Figure 6 It is a schematic structural diagram of the first embodiment of the present invention.

[0021] Figure 7 It is a schematic structural diagram of the first embodiment of the present invention.

[0022] Figure 8 It is a schematic structural diagram of the first embodiment of the present invention.

[0023] Figure 9 It is a schematic structural diagram of the second embodiment of the present invention.

[0024] Figure 10 It is a schematic structural diagram of the second embodiment of the present invention.

[0025] Figure 11 It is a schematic structural diagram of the second embodiment of the present invention.

[0026] Figure 12 It is a schematic structural diagram of the third embodiment of the present invention.

[0027] Figure 13 It is a schematic structural diagram of the third embodiment of the present invention.

[0028] Figure 14 It is a schematic structural diagram of the fourth embodiment of the present invention.

[0029] Figure 15 It is a schematic structural diagram of the fourth embodiment of the present invention.

[0030] The reference numerals in the drawings are respectively: 1-1, stirring vane; 1-1a, upper plate surface; 1-1b, lower plate surface; 1-2, deflector; 1-2a, positive deflector; 1-2b, reverse deflector; 2, support block; 3, drill bit joint; 4, free blade; 5, excavation and grouting blade; 6, excavation blade; 7, drill bit center rod; 8, stirring blade unit; 9, stirring blade assembly. Detailed implementation manners

[0031] The present invention will be described in detail below with reference to the accompanying drawings: It includes a drill bit central rod 7, and at least one set of stirring blade units 8 are arranged radially on the drill bit central rod 7, and each set of stirring blade units 8 are arranged at equal intervals along the axial direction of the drill bit central rod 7, so that the stirring between the soil body and the curing agent is more uniform; the stirring blade unit 8 includes stirring blade assemblies 9 that are distributed in a staggered manner up and down along the axial direction of the drill bit central rod 7, so that the soil body is stirred more evenly and the efficiency is also higher; the stirring blade assembly 9 includes stirring wing plates 1-1 and guide plates 1-2, the guide plates 1-2 are arranged on the upper plate surface 1-1a and / or the lower plate surface 1-1b of the stirring wing plates 1-1, the stirring wing plates 1-1 are fixed on the drill bit central rod 7, and at least two stirring wing plates 1-1 are arranged at equal intervals around the radial direction of the drill bit central rod 7. The beneficial effects of adopting the present invention include: 1. Solve the technical problem that the curing agent cannot be stirred evenly during the construction of traditional mixing piles; 2. Solve the problem of uneven force on the drill bit caused by the setting of the guide plate; 3. The overall stirring of various soil bodies and the curing agent is uniform and fully mixed, and a high-strength solidified soil body can be formed; 4. Under the condition of the same overall strength of the solidified soil, a large amount of curing agent materials can be saved; 5. The present invention has strong versatility and good applicability, and can be applied to various mixing process drill bits; 6. Greatly improve the construction speed, construction efficiency and can shorten the construction period; 7. Ensure the excellent quality, engineering safety and cost reduction of deep mixing piles.

[0032] A drill bit joint 3 is provided at the upper end of the drill bit central rod 7, and a free blade 4, an excavation and grouting blade 5 and an excavation blade 6 are successively provided at the lower end of the drill bit central rod 7, and the free blade 4, the excavation and grouting blade 5 and the excavation blade 6 are all located below the stirring blade unit 8, and the excavation and grouting blade 5 and the excavation blade 6 are symmetrically distributed in the radial direction of the drill bit central rod 7.

[0033] Example 1:

[0034] The following further elaborates on the present invention in combination with Example 1 and the attached Figures 1 to 8 drawings. Figure 2 shows a mixing pile drill bit adopting the stirring blade structure of the present invention. This mixing pile drill bit includes a stirring blade assembly 9 (such as Figure 1 ), a support block 2, a drill bit joint 3, a free blade 4, an excavation and grouting blade 5, an excavation blade 6, and a drill bit central rod 7. Among them, the stirring blade assembly 9 is configured with two layers. Reverse guide plates 1-2b are distributed on the lower plate surface 1-1b of the two stirring wing plates 1-1 of the upper-layer stirring blade assembly 9, and a support block 2 is provided on the upper plate surface 1-1a; positive guide plates 1-2a are distributed on the upper plate surface 1-1a of the stirring wing plates 1-1 of the lower-layer stirring blade assembly 9, and a support block 2 is provided on the lower plate surface 1-1b; as Figure 4 , 6, as shown in Figure 8, when the drill bit rotates clockwise, due to the guiding effect of the positive guiding plate 1-2a, the soil near the drill bit center rod 7 is forced to transfer outward. Due to the relative effect, at this time, the soil has a horizontal thrust towards the drill bit center rod 7 and a component force perpendicular to it on the guiding plate. At the same time, the mixing blade assembly 9 on the opposite side also receives a horizontal thrust towards the drill bit center rod 7 and a component force perpendicular to it from the soil. These two sets of forces are just opposite in direction, and the resultant bending moment on the drill bit center rod 7 is 0. Similarly, due to the guiding effect of the reverse guiding plate 1-2b on the upper mixing blade assembly 9, the soil far from the drill bit center rod 7 is forced to transfer towards the center. At the same time, the forces of the soil on the two reverse guiding plates 1-2b on both sides are also opposite to each other, and the resultant bending moment on the drill bit center rod 7 is also 0. In addition, the lower mixing blade assembly 9 forcibly displaces the soil inward, and the upper mixing blade assembly 9 forcibly displaces the soil outward, causing the soil to form a convection in the horizontal direction, greatly enhancing the mixing uniformity effect. However, the inward displacement of the soil will increase the friction force on the drill bit center rod 7, thereby increasing the resistance torque of the drill bit, which is an adverse effect. While the outward displacement of the soil reduces the friction force on the drill bit center rod 7, thereby reducing the resistance torque of the drill bit, which is a beneficial effect. When the drill bit rotates, the adverse effect and the beneficial effect appear simultaneously. Overall, the beneficial effect and the adverse effect just offset each other, so the influence on the torque of the drilling rig caused by the soil displacement is exactly 0. Similarly, when the drill bit rotates counterclockwise, the direction of the forced displacement of the soil is reversed, and the forces of the soil on the guiding plate 1-2 and the drill bit center rod 7 also reverse simultaneously. The combined action of the bending moment on the drill bit center rod 7 and the torque on the drill bit center rod 7 is still 0, avoiding the bending deformation of the drill bit center rod 7 and mechanical damage caused by excessive construction torque.

[0035] The mixing blade assembly 9 is fixedly connected to the drill bit center rod 7 in a radial manner, and the guiding plate 1-2 is obliquely and perpendicularly fixed on the upper plate surface 1-1a or the lower plate surface 1-1b of the mixing wing plate 1-1. The total number of reverse guiding plates 1-2b provided on the upper mixing blade assembly 9 is equal to the total number of positive guiding plates 1-2a provided on the lower mixing blade assembly 9. The positive and negative acting forces provided by the equal-numbered positive guiding plates 1-2a and reverse guiding plates 1-2b are approximately equal in magnitude, and after canceling each other out, no or very little additional acting force will be generated on the drill bit.

[0036] At the same cross-sectional height of the drill bit center rod 7, the spacing between the guiding plates 1-2 on each mixing wing plate 1-1 is equal. The distances between the two guiding plates 1-2 on the mixing wing plates 1-1 on both sides of the drill bit center rod 7 close to the drill bit center rod 7 are equal or unequal to the axis of the drill bit center rod 7, as Figure 4 、 6 、as shown in Figure 8, L1 = L2 or L1 ≠ L2; The purpose of this setting is to enable the soil around the drill bit center rod to continuously move inward or outward, resulting in a better mixing effect.

[0037] The minimum height of the deflector is set to a = L·υ / (ω·r), where L is the vertical projection width of the stirring vane 1-1, υ is the drilling speed of the drill bit, ω is the rotational angular velocity of the central rod 7 of the drill bit, and r is the distance from the center of the deflector to the axis of the central rod of the drill bit.

[0038] The ratio of the projection width a of the deflector 1-2 in the extending direction of the stirring vane 1-1 to the width b of the stirring vane 1-1 is 0.5 to 1.5, and is 1.0 in this embodiment.

[0039] In order to achieve the deflector effect, the shape of the deflector 1-2 can be diverse, such as Figure 3 As shown, it is a straight line shape, and the angle between the plate surface direction and the vertical plane direction of the extending direction of the stirring vane is 20°. Figure 5 As shown, it is an arc shape, and the angle between the vertical plane of the chord of the arc and the vertical plane direction of the extending direction of the stirring vane is 20°. Figure 7 As shown, it is a broken line shape, and the angle between the vertical plane of the connecting line of the head and the tail of the broken line and the vertical plane direction of the extending direction of the stirring vane is 20°.

[0040] Support blocks 2 are arranged on the upper plate surface 1-1a of the stirring vane 1-1 of the upper stirring blade assembly 9, and support blocks 2 are arranged on the lower plate surface 1-1b of the stirring vane 1-1 of the lower stirring blade assembly 9; during the rotation of the drill bit, the soil body has a certain horizontal acting force on the deflector 1-2, and then generates a certain bending moment on the entire stirring vane 1-1. Arranging the support blocks 2 on the opposite side of the deflector 1-2 can play a role in balancing the bending moment, and at the same time can strengthen the connection between the stirring vane 1-1 and the central rod 7 of the drill bit.

[0041] The range of the angle α between the upper plate surface 1-1a of the stirring vane 1-1 and the radial horizontal plane of the central rod 7 of the drill bit is 0 to 45°, and is 20° in this embodiment. It can produce a better shearing and disturbing effect on the soil body in front of the plate in the rotating direction, and at the same time has a smaller resistance to the drill bit.

[0042] The usage method of the mixing pile drill bit of the mixing blade assembly 9 applying the present invention includes the following technological steps:

[0043] 1) Construction in the downward stage of the drill rig: Determine the pile positions of the mixing piles. After the drill rig is in place, start the drill rig and the background slurry supply system to ensure smooth slurry spraying from the drill bit. Apply clockwise torque and vertical drilling pressure to the drill pipe according to the set construction parameters, and carry out the drilling and mixing operations in the downward stage of the drill rig. At the same time, use the grouting pump to quantitatively spread the curing agent through the slurry spraying port; the lower mixing blade assembly 9 first contacts the underlying soil. Due to the guiding effect of the positive guiding plate 1-2a, the soil near the drill bit central rod 7 is forced to transfer outward. Subsequently, the upper mixing blade assembly 9 contacts the soil at this depth. Due to the guiding effect of the reverse guiding plate 1-2b, the soil away from the drill bit central rod 7 is forced to transfer towards the center, causing convection of the soil in the horizontal direction. Due to the shearing, excavation and crushing, and strong mixing of the excavation and spraying blades 5 and the mixing blade assembly 9 of the drill tool in the vertical direction and around the central axis direction of the mixing pile, combined with the convective mixing of each guiding plate 1-2 in the horizontal radial direction of the mixing pile, the locally aggregated curing agent slurry ejected can be brought to each point of the cross-section of the mixing pile, achieving full and overall uniform mixing of the solidified soil; until the downward operation of the drill bit reaches the designed pile bottom elevation, the construction of the downward drilling and mixing operation stage is completed.

[0044] 2) Construction in the upward stage of the drill rig: The drill bit continues to apply torque and pulling force in the opposite direction to the downward stage to the drill pipe according to the set construction parameters, and carry out the secondary mixing operation of the mixing pile in the upward stage of the drill rig; According to construction needs, quantitative spreading of the secondary curing agent can also be carried out at this time; In the secondary mixing operation stage, the drill rig can increase the rotation speed and lifting speed of the mixing drill tool; Similar to the construction in the upward stage of the drill rig, through the secondary shearing, strong mixing and reverse pressure of the upper excavation blade 5 and the mixing blade assembly 9 of the drill bit in the vertical direction and around the central axis direction of the mixing pile, combined with the secondary convective mixing of the guiding plate 1-2 in the horizontal radial direction of the mixing pile, until the upward operation of the mixing mechanism reaches the designed pile top elevation, the construction of the upward mixing operation stage is completed; For mixing piles using the construction process of one-shot two-mixing or two-shot two-mixing, the construction operations have been completed in this stage.

[0045] Embodiment 2:

[0046] This embodiment is another implementation form of the present invention. The following further elaborates and explains the present invention in combination with Embodiment 2 and the attached Figures 9 to 11 The only difference between this embodiment and Embodiment 1 is that: the guiding plates 1-2 in the mixing blade assembly 9 are arranged in a front-back staggered manner, the spacing between the guiding plates 1-2 is equal, the number of guiding plates 1-2 on the mixing blade assemblies 9 on both sides of the drill bit central rod 7 is equal, and the projection width a of the guiding plates 1-2 distributed in a staggered shape in the extending direction of the mixing wing plate 1-1 is approximately equal to the width b of the mixing wing plate 1-1. As Figure 10As shown, this staggered arrangement can have a more significant effect on the segmentation and shearing of the soil during construction, and at the same time, the continuous diversion effect will be better.

[0047] The usage method of the mixing pile drill bit with the mixing blade assembly 9 of the present invention is similar to that in Embodiment 1, and will not be elaborated here.

[0048] Embodiment 3:

[0049] This embodiment is another implementation form of the present invention. The following further elaborates the present invention in conjunction with Embodiment 3 and the attached Figures 12 to 13 The difference between this embodiment and Embodiment 1 is that: the diversion plates 1-2 in the mixing blade assembly 9 are located on the upper and lower plate surfaces of the mixing wing plates 1-1. The number and positions of the diversion plates 1-2 on the upper plate surface 1-1a of the mixing wing plates 1-1 correspond to those of the diversion plates 1-2 on the lower plate surface 1-1b of the mixing wing plates 1-1. All the diversion plates 1-2 on the upper-layer mixing wing plates 1-1 are reverse diversion plates 1-2b, and all the diversion plates 1-2 on the lower-layer mixing wing plates 1-1 are reverse diversion plates 1-2b. At the same time, the support plate 2 in Embodiment 1 is removed. During the rotation of the drill bit, the soil has a certain horizontal force on the upper and lower diversion plates 1-2 of the same mixing blade assembly 9, and the directions of the horizontal forces are the same. At this time, the bending moment generated on the mixing wing plate 1-1 in the middle just cancels out, and no bending effect will be produced on the mixing wing plate 1-1. Compared with Embodiment 1, in Embodiment 3, when the number of mixing wing plates 1-1 remains unchanged, the number of diversion plates 1-2 increases by 1 time. During the construction process of the drill bit drilling down or lifting, a double diversion effect can be provided, resulting in more sufficient mixing.

[0050] The usage method of the mixing pile drill bit with the mixing blade assembly 9 of the present invention is similar to that in Embodiment 1, and will not be elaborated here.

[0051] Embodiment 4:

[0052] This embodiment is another implementation form of the present invention. The following further elaborates the present invention in conjunction with Embodiment 4 and the attached Figures 14 to 15A further elaboration and explanation of the present invention is made. The difference between this embodiment and Embodiment 1 lies in that: a total of 2 groups of stirring blade units 8 are installed on the drill bit, with a total of 4 layers of stirring blade assemblies 9. From top to bottom, the flow guiding plates 1-2 on the first layer and the second layer are opposite to each other, forming one group, and the flow guiding plates 1-2 on the third layer and the fourth layer are opposite to each other, forming another group. When the drill bit drills down and lifts, the positive and negative acting forces and the flow guiding effects received by the flow guiding plates 1-2 in each group can cancel each other out, and will not have a negative impact on the drill bit structure and the main structure of the drilling rig. The design of the 4-layer stirring blade assembly 9 can cut the soil horizontally and vertically more times, and provide more times of flow guiding effects, resulting in more sufficient stirring.

[0053] The usage method of the mixing pile drill bit with the stirring blade assembly 9 of the present invention is similar to that in Embodiment 1, and will not be elaborated here.

[0054] The present invention is not limited to the above embodiments. No matter what changes are made in its shape or material composition, as long as the structural design provided by the present invention is adopted, it is a deformation of the present invention and should be considered within the protection scope of the present invention.

Claims

1. A stirring blade structure for a drilling tool in the construction of large-diameter mixing piles, including a drill bit central rod (7), Characterized in that: At least one set of stirring blade units (8) is arranged in the radial direction of the drill bit central rod (7), and each set of stirring blade units (8) is arranged along the axial direction of the drill bit central rod (7); the stirring blade unit (8) includes stirring blade assemblies (9) that are distributed up and down along the axial direction of the drill bit central rod (7); the stirring blade assembly (9) includes a stirring wing plate (1-1) and a flow guide plate (1-2), the flow guide plate (1-2) is arranged on the upper plate surface (1-1a) and / or the lower plate surface (1-1b) of the stirring wing plate (1-1), the stirring wing plate (1-1) is fixed on the drill bit central rod (7), and at least two stirring wing plates (1-1) are provided and are equidistantly distributed around the radial direction of the drill bit central rod (7); the flow guide plate (1-2) includes a positive flow guide plate (1-2a) and a reverse flow guide plate (1-2b), and a number of positive flow guide plates (1-2a) or reverse flow guide plates (1-2b) are arranged on the same plate surface of the stirring wing plates (1-1) at the same cross-section height along the drill bit central rod (7); on the opposite plate surfaces of the stirring wing plates (1-1) that are distributed up and down, a positive flow guide plate (1-2a) is arranged on the plate surface of one stirring wing plate (1-1), and a reverse flow guide plate (1-2b) is arranged on the plate surface of the other stirring wing plate (1-1), and the number of the positive flow guide plates (1-2a) is equal to the number of the reverse flow guide plates (1-2b); when the flow guide plate (1-2) is arranged on the upper plate surface (1-1a) or the lower plate surface (1-1b) of the stirring wing plate (1-1), a support block (2) is arranged on the plate surface opposite to the upper plate surface (1-1a) or the lower plate surface (1-1b) of the stirring wing plate (1-1).

2. The stirring blade structure for a drilling tool in the construction of large-diameter mixing piles according to claim 1, Characterized in that: The flow guide plate (1-2) is obliquely and perpendicularly fixed on the stirring wing plate (1-1), and the range of the angle θ between the setting direction of the flow guide plate (1-2) and the plate surface of the stirring wing plate (1-1) is 0 to 45°.

3. The stirring blade structure for a drilling tool in the construction of large-diameter mixing piles according to claim 1, Characterized in that: The projection width a of the flow guide plate (1-2) in the extending direction of the stirring wing plate (1-1) and the width b of the stirring wing plate (1-1) are in a ratio of 0.5 to 1.

5.

4. The stirring blade structure for a drilling tool in the construction of large-diameter mixing piles according to claim 1, Characterized in that: The range of the angle α between the upper plate surface (1-1a) of the stirring wing plate (1-1) and the radial horizontal plane of the drill bit central rod (7) is 0 to 45°.

5. The stirring blade structure for a drilling tool in the construction of large-diameter mixing piles according to claim 1, Characterized in that: A plurality of positive flow guiding plates (1-2a) are provided and are arranged in a straight line or in a staggered manner in sequence along the length direction of the stirring vane (1-1), and the adjacent positive flow guiding plates (1-2a) are evenly spaced.

6. The stirring vane structure of the drilling tool for large-diameter mixing pile construction according to claim 1, characterized in that: A plurality of reverse flow guiding plates (1-2b) are provided and are arranged in a straight line or in a staggered manner in sequence along the length direction of the stirring vane (1-1), and the adjacent reverse flow guiding plates (1-2b) are evenly spaced.

7. The stirring vane structure of the drilling tool for large-diameter mixing pile construction according to claim 1, characterized in that: A drill bit joint (3) is provided at the upper end of the drill bit center rod (7), and a free blade (4), an excavating and grouting blade (5) and an excavating blade (6) are successively provided at the lower end of the drill bit center rod (7), and the free blade (4), the excavating and grouting blade (5) and the excavating blade (6) are all located below the stirring vane unit (8), and the excavating and grouting blade (5) and the excavating blade (6) are symmetrically distributed in the radial direction of the drill bit center rod (7).

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