Powder spraying stirring device and construction method

Abstract

The invention provides a powder spraying and stirring device and a construction method. The powder spraying and stirring device comprises a machine body, a driving part, an inner drill rod, an outer drill rod and stirring blades, and the driving part is arranged on the machine body; the inner drill rod is arranged in the outer drill rod, the driving piece drives the inner drill rod and the outer drill rod to rotate, the multiple stirring blades are arranged, and the multiple stirring blades are connected with the inner drill rod and the outer drill rod correspondingly; the stirring blades comprise supporting blades, folding blades and limiting baffles, the supporting blades are connected with the inner drill rod and the outer drill rod respectively, and the supporting blades are hinged to the folding blades; the limiting baffles are connected with the supporting blades, abut against the folding blades and are used for limiting the positions of the folding blades. A resistance plate is connected to one side of the folding blade, the length direction of the resistance plate is parallel to that of the folding blade, and the thickness of the resistance plate is larger than that of the folding blade. The variable cross-section pile can be conveniently formed.

Description

Technical Field

[0001] The present application relates to the technical field of powder injection pile construction, and in particular to a powder injection stirring device and a construction method. Background Art

[0002] Powder injection pile is a form of deep mixing method for strengthening foundation, also called reinforced soil pile, which is often used to strengthen silt, silty soil, silty soil and clay soil with high water content. It uses powdered curing agent to mix soft foundation, and uses a special powder injection mixing device to forcefully mix soft soil and curing agent (slurry and powder) on site. A series of physical and chemical reactions between curing agent and soft soil are used to harden the soft soil into a high-quality foundation with integrity, water stability and certain strength.

[0003] When performing powder injection pile construction, a powder injection stirring device is required. The powder injection stirring device generally includes a machine body, a drive motor, an inner drill rod, an outer drill rod and a stirring blade. There are multiple stirring blades, and the stirring blades are fixedly connected to the inner drill rod and the outer drill rod respectively. The drive motor, the inner drill rod and the outer drill rod are all installed on the machine body, and the drive motor drives the inner drill rod and the outer drill rod to rotate respectively. The machine body has a lifting mechanism, which can drive the inner drill rod and the outer drill rod to lift and move, so as to perform drilling and lifting operations, and finally form powder injection piles.

[0004] In order to adapt to the foundation with varying strata hardness and improve certain pull-out resistance, the pile diameter needs to change with the strata hardness. During the pile forming process, the drill bit needs to be able to change freely and flexibly according to the stratum structure to form a variable cross-section pile with different pile diameters. However, the diameters of the mixing blades of the inner drill rod and the outer drill rod in the related art are fixed, which can only form a pile with a fixed diameter, and it is difficult to form a variable cross-section pile, so it needs to be improved. Summary of the invention

[0005] In order to facilitate the formation of a variable cross-section pile type, the present application provides a powder spraying and mixing device and a construction method.

[0006] In the first aspect, the present application provides a powder spraying and stirring device, which adopts the following technical solution: A powder spray stirring device comprises a body, a driving member, an inner drill rod, an outer drill rod and stirring blades, wherein the driving member is arranged on the body; the inner drill rod is arranged inside the outer drill rod, the driving member drives the inner drill rod and the outer drill rod to rotate respectively, and a plurality of stirring blades are arranged, and the plurality of stirring blades are respectively connected to the inner drill rod and the outer drill rod; The stirring blade includes a supporting blade, a folding blade and a limit baffle, the supporting blade is respectively connected to the inner drill rod and the outer drill rod, and the supporting blade and the folding blade are hinged; the limit baffle is connected to the supporting blade, the limit baffle abuts against the folding blade, and the limit baffle is used to limit the position of the folding blade.

[0007] By adopting the above technical solution, when the inner drill rod and the outer drill rod rotate, the folding blades are stored in the supporting blades; when the rotation direction of the inner drill rod and the outer drill rod is changed, the folding blades are unfolded and abut against the limit baffle, thereby changing the diameter of the pile hole and improving the flexibility and adaptability of the equipment. The setting of the limit baffle effectively limits the unfolding range of the folding blades, ensuring that the mixing blades can still maintain a stable shape and function under different geological conditions, thereby achieving a more uniform mixing effect and improving the quality and stability of the powder injection pile.

[0008] Optionally, a resistance plate is connected to one side of the folding blade, the length direction of the resistance plate is parallel to the length direction of the folding blade, and the resistance plate protrudes from the surface of the folding blade.

[0009] By adopting the above technical solution, the setting of the resistance plate enables the folding blades to better cut and mix the soil during the rotation process, thereby improving the mixing efficiency and uniformity. The resistance plate protrudes from the surface of the folding blades and is subject to a certain resistance when mixing the soil, which is conducive to unfolding or storing the folding blades.

[0010] Optionally, a transmission mechanism is provided on the machine body, the transmission mechanism comprises a transmission box, an inner shaft and an outer shaft, the transmission box is provided on the machine body, the inner shaft and the outer shaft are both rotatably connected to the transmission box, and the inner shaft is connected to the inner drill rod; The outer shaft includes a supporting outer shaft and a telescopic outer shaft, the supporting outer shaft and the telescopic outer shaft are slidably connected, and the telescopic outer shaft is connected to the outer drill rod; an adjustment component is arranged between the supporting outer shaft and the telescopic outer shaft, and the adjustment component is used to adjust the sliding distance of the telescopic outer shaft along the axis of the supporting outer shaft.

[0011] By adopting the above technical solution, the driving member drives the inner drill rod to rotate through the inner shaft, and the driving member drives the outer drill rod to rotate through the outer shaft. When the adjusting component makes the telescopic outer shaft slide along the axis of the supporting outer shaft, the relative positions of the inner drill rod and the outer drill rod can be adjusted, thereby changing the spacing of the mixing blades on the inner drill rod and the outer drill rod. The spacing of the mixing blades can be pre-adjusted according to the hardness of the soil layer, thereby enhancing the mixing effect and improving the applicability of the device.

[0012] Optionally, the adjustment component includes: A support ring connected to the supporting outer shaft; A connecting column, the connecting column is connected to the telescopic outer shaft, and the connecting column is passed through the supporting ring; A locking piece, wherein the locking piece is used to lock the connecting column onto the supporting ring.

[0013] By adopting the above technical solution, the distance that the connecting column passes through the support plate is adjusted, and then the position of the connecting rod is locked using a locking piece. The connecting column connects the support ring and the telescopic outer shaft, thereby being able to adjust the sliding distance of the telescopic outer shaft on the supporting outer shaft.

[0014] Optionally, the locking member includes an adjusting nut, which is threadedly connected to the connecting column, and a plurality of adjusting nuts are provided. The adjusting nuts are located on both sides of the support ring, and the adjusting nuts clamp the support ring.

[0015] By adopting the above technical solution, multiple adjusting nuts clamp the support ring, thereby locking the position of the connecting column on the support ring, improving the stability and reliability of the telescopic outer shaft, reducing the loosening or displacement of the telescopic outer shaft caused by external forces, and improving the overall stability of the equipment. In addition, the adjusting nut is threadedly connected to the connecting column, which is convenient for adjustment and maintenance, and improves the convenience of operation.

[0016] Optionally, the adjustment assembly further includes a reinforcing rod and a rotating ring seat, the rotating ring seat is connected to the transmission box, the reinforcing rod is respectively connected to the rotating ring seat and the support ring, and the reinforcing rod is rotatably connected to the transmission box via the rotating ring seat.

[0017] By adopting the above technical solution, the reinforcing rod can provide supporting force to the support ring and improve the structural strength of the support ring.

[0018] Optionally, a receiving ring groove is opened at the end of the supporting outer shaft, and the telescopic outer shaft is inserted into the receiving ring groove; the supporting outer shaft is connected to a dust plug, and the dust plug is tightly attached to the telescopic outer shaft, and the dust plug blocks the receiving ring groove.

[0019] By adopting the above technical solution, the receiving ring groove opened at the end of the supporting outer shaft allows the telescopic outer shaft to be smoothly inserted and remain stable, ensuring the normal operation of the outer drill rod. The dust plug fits tightly against the telescopic outer shaft and blocks the receiving ring groove, effectively reducing the entry of dust and other impurities, and improving the reliability and maintenance cycle of the equipment.

[0020] Optionally, the transmission mechanism includes a transmission shaft, a first transmission assembly and a second transmission assembly, the transmission shaft is rotatably connected to the transmission box, and the driving member drives the transmission shaft to rotate; the first transmission assembly is respectively connected to the transmission shaft and the inner shaft, and the second transmission assembly is respectively connected to the transmission shaft and the outer shaft.

[0021] By adopting the above technical solution, the driving member transmits power to the transmission shaft, and the transmission shaft transmits power to the inner shaft through the first transmission assembly, thereby driving the inner drill rod to rotate. The transmission shaft transmits power to the outer shaft through the second transmission assembly, thereby driving the outer drill rod to rotate.

[0022] Optionally, the stirring blades located on the inner drill rod and the outer drill rod are staggered.

[0023] By adopting the above technical solution, the mixing blades of the inner drill rod and the outer drill rod are staggered, which improves the mixing efficiency and uniformity, makes the curing agent and the soft soil mixed more fully, and thus enhances the overall stability and strength of the powder injection pile.

[0024] In a second aspect, the present application provides a powder injection pile construction method, comprising the following steps: S1: Drilling and sampling: drilling holes in the foundation to be constructed and taking out soil samples, and analyzing the soil samples; S2: Trial operation: use a powder spraying and mixing device to drill a pile hole with a certain depth in the test area, understand the difficulty of drilling and lifting, and determine the drilling and lifting speed; S3: Drilling operation, start the powder spraying and stirring device, make the powder spraying and stirring device cut the soil downward, make the inner drill rod and the outer drill rod rotate in the positive and negative directions respectively, drive the stirring blades to stir the soil, and input the curing agent into the soil; after reaching the predetermined depth, change the rotation direction of the inner drill rod and the outer drill rod to form a variable cross-section pile type, until the construction reaches the designed depth; S4: Lifting and stirring: lift the stirring blades, stop inputting the curing agent into the pile hole, and change the rotation direction of the inner drill rod and the outer drill rod; after reaching the predetermined depth, change the rotation direction of the inner drill rod and the outer drill rod again until the inner drill rod and the outer drill rod leave the top of the pile hole.

[0025] In summary, the present application includes at least one of the following beneficial effects: 1. By adopting the foldable mixing blade design, the deployment state of the mixing blade can be adjusted under different stratum conditions, thereby realizing the formation of variable cross-section piles, enhancing the flexibility and adaptability of construction, and effectively solving the limitations of the fixed diameter mixing blades in related technologies; 2. The limit baffle design between the folding blade and the supporting blade can limit the unfolding angle of the folding blade and ensure the stability and reliability of the mixing blade; 3. Adjust the length of the connecting column passing through the support ring, and then use the locking piece to lock the position of the connecting column, so as to adjust the moving distance of the telescopic outer shaft on the supporting outer shaft, and then adjust the spacing of the mixing blades on the inner drill rod and the outer drill rod to improve adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 12 is a front view structural schematic diagram of the powder spraying and stirring device of Example 1 of the present application; Figure 2 This is a schematic cross-sectional view of the powder spraying and stirring device of Example 1 of the present application; Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of part A; Figure 4 1 is a schematic diagram of the front view structure of the stirring blade of Example 1 of the present application; Figure 5 It is a schematic diagram of the top view structure of the stirring blade in Example 1 of the present application.

[0027] Explanation of the reference numerals in the accompanying drawings: 1. driving member; 2. inner drill rod; 21. discharge port; 3. outer drill rod; 4. stirring blade; 41. supporting blade; 42. folding blade; 43. limit baffle; 44. resistance plate; 5. transmission mechanism; 51. transmission box; 52. transmission shaft; 53. inner shaft; 54. outer shaft; 541. supporting outer shaft; 542. telescopic outer shaft; 55. first transmission assembly; 551. transmission chain; 552. transmission sprocket; 56. second transmission assembly; 561. driving gear; 562. driven gear; 57. ash sprayer; 58. dust plug; 6. adjustment assembly; 61. supporting ring; 62. connecting column; 63. locking member; 64. reinforcing rod; 65. rotating ring seat. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-5 This application is described in further detail.

[0029] Embodiment 1: Embodiment 1 of the present application provides a powder spraying and stirring device.

[0030] refer to Figure 1 The powder spraying and stirring device includes a machine body, a driving member 1 and a transmission mechanism 5. The transmission mechanism 5 and the driving member 1 are both installed on the machine body. The driving member 1 specifically adopts a motor. The lifting mechanism of the machine body can drive the driving member 1 and the transmission mechanism 5 to move up and down, thereby performing drilling and lifting operations.

[0031] refer to Figure 1 and Figure 2 The transmission mechanism 5 includes a transmission box 51, a transmission shaft 52, an inner shaft 53, an outer shaft 54, a first transmission assembly 55, a second transmission assembly 56 and an ash sprayer 57. The transmission box 51 is mounted on the machine body, the transmission shaft 52, the inner shaft 53 and the outer shaft 54 ​​are all rotatably connected to the transmission box 51, the driving member 1 can drive the transmission shaft 52 to rotate, and the inner shaft 53 is arranged inside the outer shaft 54.

[0032] refer to Figure 1 and Figure 2The first transmission assembly 55 includes a transmission chain 551 and a transmission sprocket 552. Two transmission sprockets 552 are provided, and the two transmission sprockets 552 are respectively fixedly connected to the transmission shaft 52 and the inner shaft 53. The transmission chain 551 is sleeved on the two transmission sprockets 552, so that the transmission shaft 52 transmits power to the inner shaft 53 through the first transmission assembly 55.

[0033] refer to Figure 1 and Figure 2 The outer shaft 54 ​​includes a supporting outer shaft 541 and a telescopic outer shaft 542, and the supporting outer shaft 541 is rotatably connected to the transmission box 51. The second transmission assembly 56 includes a driving gear 561 and a driven gear 562, the driving gear 561 is fixedly connected to the transmission shaft 52, and the driven gear 562 is fixedly connected to the supporting outer shaft 541, the driving gear 561 and the driven gear 562 are meshed, and the transmission shaft 52 transmits power to the supporting outer shaft 541 through the second transmission assembly 56, and the rotation direction of the supporting outer shaft 541 is opposite to that of the inner shaft 53.

[0034] refer to Figure 2 and Figure 3 The bottom end of the supporting outer shaft 541 is provided with a receiving ring groove, and the telescopic outer shaft 542 is inserted into the receiving ring groove. The telescopic outer shaft 542 can slide along the axial direction of the supporting outer shaft 541. The inner shaft 53 is coaxially connected to the inner drill rod 2 through a flange, and the telescopic outer shaft 542 is coaxially connected to the outer drill rod 3 through a flange. The bottom end of the supporting outer shaft 541 is fixedly connected with a dust plug 58, which is tightly attached to the telescopic outer shaft 542. The dust plug 58 blocks the receiving ring groove to reduce the entry of external impurities into the receiving ring groove.

[0035] refer to Figure 1 and Figure 2 The ash sprayer 57 is rotatably connected and communicated with the inner shaft 53, and the ash sprayer 57 can transport the curing agent into the inner shaft 53. The inner drill rod 2 is connected with a discharge port 21, and the curing agent inside the inner drill rod 2 is sprayed out from the discharge port 21, so that the curing agent is mixed with the soil.

[0036] refer to Figure 2 and Figure 3, the transmission box 51 is provided with an adjustment assembly 6, and the adjustment assembly 6 includes a support ring 61, a connecting column 62 and a locking member 63. The support ring 61 is sleeved on the bottom end of the support outer shaft 541, and the support ring 61 is fixedly connected to the support outer shaft 541. The connecting column 62 is fixedly connected to the bottom end of the telescopic outer shaft 542, and the connecting column 62 passes through the support ring 61. In this embodiment, the locking member 63 specifically adopts an adjusting nut, and a plurality of adjusting nuts are provided. The adjusting nuts are threadedly connected to the connecting column 62, and the adjusting nuts clamp the support ring 61 from both sides of the support ring 61, thereby locking the position of the connecting column 62, and then locking the length of the telescopic outer shaft 542 extending from the support outer shaft 541. A plurality of connecting columns 62 are provided around the circumference of the support outer shaft 541 to improve the connection strength between the support outer shaft 541 and the telescopic outer shaft 542. When the supporting outer shaft 541 rotates, the supporting ring 61 rotates along with the supporting outer shaft 541 , and the supporting ring 61 drives the telescopic outer shaft 542 to rotate through the connecting column 62 , and the telescopic outer shaft 542 drives the outer drill rod 3 to rotate.

[0037] refer to Figure 2 and Figure 3 The adjustment assembly 6 further includes a reinforcing rod 64 and a rotating ring seat 65. The rotating ring seat 65 includes a bottom ring and a rotating ring. The bottom ring and the rotating ring are rotatably connected. The rotating axis of the rotating ring is coaxial with the rotating axis of the supporting outer shaft 541. The bottom ring is fixedly connected to the transmission box 51. One end of the reinforcing rod 64 is fixedly connected to the rotating ring. The other end of the reinforcing rod 64 is fixedly connected to the supporting ring 61. The reinforcing rod 64 can provide support force to the supporting ring 61, thereby improving the structural strength and stability of the supporting ring 61.

[0038] refer to Figure 1 The bottom ends of the inner drill rod 2 and the outer drill rod 3 are both provided with stirring blades 4, and the stirring blades 4 on the inner drill rod 2 and the stirring blades 4 on the outer drill rod 3 are staggered. Specifically, the stirring blades 4 on the inner drill rod 2 and the stirring blades 4 on the outer drill rod 3 are perpendicular to each other in the plane.

[0039] refer to Figure 4 and Figure 5 The stirring blade 4 includes a supporting blade 41, a folding blade 42, a limiting baffle 43 and a resistance plate 44. The plurality of supporting blades 41 are fixedly connected to the inner drill rod 2 and the outer drill rod 3 respectively, and the folding blade 42 is hinged to the supporting blade 41. The limiting baffle 43 is fixedly connected to the end of the supporting blade 41, and the limiting baffle 43 extends a certain length. When the folding blade 42 rotates to a fully unfolded state, the folding blade 42 abuts against the limiting baffle 43.

[0040] refer to Figure 4 and Figure 5The resistance plate 44 is fixedly connected to one side of the folding blade 42, and the resistance plate 44 protrudes from the surface of the folding blade 42. When the stirring blade 4 is rotating, the resistance plate 44 is subjected to a certain resistance, which is conducive to unfolding the folding blade 42.

[0041] refer to Figure 1 and Figure 4 Since the rotation directions of the inner drill rod 2 and the outer drill rod 3 are opposite, the unfolding directions of the folding blades 42 located at the inner drill rod 2 and the outer drill rod 3 are also opposite. When the output shaft of the driving member 1 rotates forward, all the folding blades 42 are not unfolded, that is, at this time, the diameters of the stirring blades 4 of the inner drill rod 2 and the outer drill rod 3 are the same; when the output shaft of the driving member 1 rotates reversely, all the folding blades 42 are in the unfolded state, that is, at this time, the diameters of the stirring blades 4 of the inner drill rod 2 and the outer drill rod 3 are also the same. By controlling the forward and reverse rotation of the output shaft of the driving member 1, pile holes of different diameters can be formed.

[0042] The implementation principle of a powder spray stirring device in Example 1 of the present application is as follows: the driving member 1 drives the transmission shaft 52 to rotate, and the transmission shaft 52 drives the inner shaft 53 and the outer shaft 54 ​​to rotate through the first transmission assembly 55 and the second transmission assembly 56, respectively, so that the inner drill rod 2 and the outer drill rod 3 rotate in opposite directions. The distance that the connecting column 62 passes through the support ring 61 is adjusted, and the position of the connecting column 62 is locked using the locking member 63, so as to adjust the distance that the telescopic outer shaft 542 extends, and then the spacing of the stirring blades 4 located on the outer drill rod 3 and the inner drill rod 2 can be adjusted. The inner drill rod 2 and the outer drill rod 3 drive the stirring blades 4 to rotate respectively, and by controlling the output shaft of the driving member 1 to rotate forward or reverse, it is controlled whether the folding blades 42 are in the unfolded state, thereby forming a variable cross-section pile type.

[0043] Embodiment 2: Embodiment 2 of the present application provides a powder injection pile construction method, using the powder injection stirring device in embodiment 1, comprising the following steps: S1: Drilling and sampling: Drill holes in the foundation to be constructed and take out soil samples, and analyze the soil samples; S2: Trial operation: Use a powder spraying and mixing device to drill pile holes of a certain depth in the test area, understand the difficulty of drilling and lifting, and determine the drilling and lifting speed; S3: Drilling operation: Start the powder spraying and stirring device, so that the powder spraying and stirring device cuts the soil downward, and the inner drill rod 2 and the outer drill rod 3 rotate in the positive and negative directions respectively, driving the stirring blade 4 to stir the soil and input the curing agent into the soil; after reaching the predetermined depth, change the rotation direction of the inner drill rod 2 and the outer drill rod 3 to form pile holes of different diameters until the construction reaches the designed depth; S4: lifting and mixing: lifting the mixing blade 4, stopping the input of the curing agent into the pile hole, and the mixing blade 4 mixes the soil and the curing agent; after reaching the predetermined depth, changing the rotation direction of the inner drill rod 2 and the outer drill rod 3 again until the inner drill rod 2 and the outer drill rod 3 leave the top of the pile hole.

[0044] S5: Printing receipt: After the construction reaches the top of the pile hole, the control cabinet automatically finishes printing the receipt, which records the construction parameter information.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A powder spraying stirring device, characterized in that: The invention comprises a machine body, a driving member (1), an inner drill rod (2), an outer drill rod (3) and a stirring blade (4), wherein the driving member (1) is arranged on the machine body; the inner drill rod (2) is arranged inside the outer drill rod (3); the driving member (1) drives the inner drill rod (2) and the outer drill rod (3) to rotate respectively; a plurality of stirring blades (4) are provided, and the plurality of stirring blades (4) are respectively connected to the inner drill rod (2) and the outer drill rod (3); The stirring blade (4) comprises a supporting blade (41), a folding blade (42) and a limiting baffle (43); the plurality of supporting blades (41) are respectively connected to the inner drill rod (2) and the outer drill rod (3); the supporting blades (41) and the folding blades (42) are hinged; the limiting baffle (43) is connected to the supporting blades (41); the limiting baffle (43) abuts against the folding blades (42); and the limiting baffle (43) is used to limit the position of the folding blades (42).

2. A powder spraying stirring device according to claim 1, characterized in that: A resistance plate (44) is connected to one side of the folding blade (42); the length direction of the resistance plate (44) is parallel to the length direction of the folding blade (42); and the resistance plate (44) protrudes from the surface of the folding blade (42).

3. A powder spraying stirring device according to claim 1, characterized in that: A transmission mechanism (5) is arranged on the machine body, and the transmission mechanism (5) comprises a transmission box (51), an inner shaft (53) and an outer shaft (54); the transmission box (51) is arranged on the machine body, the inner shaft (53) and the outer shaft (54) are both rotatably connected to the transmission box (51), and the inner shaft (53) is connected to the inner drill rod (2); The outer shaft (54) comprises a supporting outer shaft (541) and a telescopic outer shaft (542); the supporting outer shaft (541) and the telescopic outer shaft (542) are slidably connected, and the telescopic outer shaft (542) is connected to the outer drill rod (3); an adjustment component (6) is provided between the supporting outer shaft (541) and the telescopic outer shaft (542); the adjustment component (6) is used to adjust the sliding distance of the telescopic outer shaft (542) along the axis of the supporting outer shaft (541).

4. A powder spraying stirring device according to claim 3, characterized in that: The regulating component (6) comprises: A support ring (61), the support ring (61) being connected to the supporting outer shaft (541); A connecting column (62), the connecting column (62) being connected to the telescopic outer shaft (542), the connecting column (62) being passed through the supporting ring (61); A locking piece (63), wherein the locking piece (63) is used to lock the connecting column (62) onto the supporting ring (61).

5. A powder spraying stirring device according to claim 4, characterized in that: The locking member (63) comprises an adjusting nut, the adjusting nut being threadably connected to the connecting column (62), a plurality of the adjusting nuts being provided, the adjusting nuts being located on both sides of the supporting ring (61), and the adjusting nuts clamping the supporting ring (61).

6. A powder spraying and stirring device according to claim 4, characterized in that: The adjustment assembly (6) further comprises a reinforcing rod (64) and a rotating ring seat (65); the rotating ring seat (65) is connected to the transmission box (51); the reinforcing rod (64) is respectively connected to the rotating ring seat (65) and the support ring (61); the reinforcing rod (64) is rotatably connected to the transmission box (51) via the rotating ring seat (65).

7. A powder spraying and stirring device according to claim 3, characterized in that: An accommodating ring groove is formed at the end of the supporting outer shaft (541), and the telescopic outer shaft (542) is inserted into the accommodating ring groove; the supporting outer shaft (541) is connected to a dust plug (58), the dust plug (58) is tightly attached to the telescopic outer shaft (542), and the dust plug (58) blocks the accommodating ring groove.

8. A powder spraying and stirring device according to claim 3, characterized in that: The transmission mechanism (5) comprises a transmission shaft (52), a first transmission assembly (55) and a second transmission assembly (56); the transmission shaft (52) is rotatably connected to the transmission box (51), and the driving member (1) drives the transmission shaft (52) to rotate; the first transmission assembly (55) is respectively transmission-connected to the transmission shaft (52) and the inner shaft (53), and the second transmission assembly (56) is respectively transmission-connected to the transmission shaft (52) and the outer shaft (54).

9. A powder spraying and stirring device according to claim 1, characterized in that: The stirring blades (4) located on the inner drill rod (2) and the outer drill rod (3) are arranged in a staggered manner.

10. A powder injection pile construction method, characterized in that: Using the powder spraying stirring device as described in any one of claims 1 to 9 comprises the following steps: S1: Drilling and sampling: drilling holes in the foundation to be constructed and taking out soil samples, and analyzing the soil samples; S2: Trial operation: use a powder spraying and mixing device to drill a pile hole with a certain depth in the test area, understand the difficulty of drilling and lifting, and determine the drilling and lifting speed; S3: drilling operation, starting the powder spraying and stirring device, causing the powder spraying and stirring device to cut the soil downward, causing the inner drill rod (2) and the outer drill rod (3) to rotate in forward and reverse directions respectively, driving the stirring blades (4) to stir the soil, and inputting a curing agent into the soil; after reaching a predetermined depth, changing the rotation direction of the inner drill rod (2) and the outer drill rod (3), forming pile holes of different diameters, until the construction reaches the designed depth; S4: lifting and mixing: lifting the mixing blade (4), stopping the input of the curing agent into the pile hole, and the mixing blade (4) mixing the soil and the curing agent; after reaching the predetermined depth, changing the rotation direction of the inner drill rod (2) and the outer drill rod (3) again until the inner drill rod (2) and the outer drill rod (3) leave the top of the pile hole.

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