Cement powder spraying bidirectional mixing pile machine construction device

Abstract

The utility model relates to the technical field of foundation construction and reinforcement, in particular to a cement powder spraying two-way mixing pile machine construction device which comprises a main rod part, an inner drill rod and an outer drill rod, the bottom end of the inner drill rod is in a sharp corner shape, the outer drill rod and the inner drill rod are coaxial, and the inner drill rod and the outer drill rod are rotationally connected; the powder spraying pipe is located in the inner drill rod, a powder outlet is formed in the inner drill rod, and the powder outlet end of the powder spraying pipe is fixed to the powder outlet; the blade part comprises a first group of blades and a second group of blades, the first group of blades are located at the bottom of the second group of blades, the first group of blades are connected with the inner drill rod, and the second group of blades are connected with the outer drill rod. The construction method has the effect of improving the construction efficiency.

Description

Technical Field

[0001] This application relates to the technical field of foundation construction and reinforcement, and particularly to a construction device for a cement powder jet double-direction mixing pile machine. Background Art

[0002] Foundation reinforcement is a key link in construction projects. Among them, the powder jet pile technology is highly regarded because it can significantly improve the integrity, water stability and strength of the foundation. However, with the continuous progress of technology and the improvement of engineering requirements, traditional powder jet pile construction equipment has gradually exposed problems such as poor mixing effect and low construction efficiency.

[0003] Traditional powder jet pile construction mainly relies on the single-axis single-direction mixing process, that is, using a single mixing shaft with blades to mix soft soil and curing agent. Although this process can achieve the hardening of soft soil to a certain extent, in order to achieve the desired mixing effect, the powder jet pile often needs to be repeatedly lifted to fully mix the soil and the curing agent evenly, resulting in a long construction time and high energy consumption, increasing the project cost and reducing the overall construction efficiency, and it is difficult to meet the high-efficiency and energy-saving requirements of modern construction projects for foundation reinforcement. Utility Model Content

[0004] In order to improve the construction efficiency, this application provides a construction device for a cement powder jet double-direction mixing pile machine.

[0005] The construction device for a cement powder jet double-direction mixing pile machine provided by this application adopts the following technical solutions:

[0006] The construction device for a cement powder jet double-direction mixing pile machine includes:

[0007] The main rod part includes an inner drill rod and an outer drill rod. The bottom end of the inner drill rod is in a sharp angle shape. The outer drill rod is coaxial with the inner drill rod, and the inner drill rod is rotationally connected to the outer drill rod;

[0008] The powder spraying pipe is located inside the inner drill rod. The inner drill rod is provided with a powder outlet, and the powder outlet end of the powder spraying pipe is fixed at the powder outlet;

[0009] The blade part includes a first group of blades and a second group of blades. The first group of blades is located at the bottom of the second group of blades. The first group of blades is connected to the inner drill rod, and the second group of blades is connected to the outer drill rod.

[0010] By adopting the above technical solution, compared with unidirectional single-axis mixing, by setting an inner drill pipe and an outer drill pipe, the inner drill pipe and the outer drill pipe can rotate simultaneously, forming two mixing centers. The first group of blades and the second group of blades mix the soil at different levels, and the rotation directions of the first group of blades and the second group of blades are opposite. When the inner drill pipe penetrates into the soil and the powder spraying pipe performs powder spraying operations, it promotes the mixing and diffusion of the curing agent under the mixing action of the first group of blades on the soil layer. The second group of blades operates in the area stirred by the first group of blades. The second group of blades stir the soil in the opposite stirring direction to the first group of blades, performing reverse rotational stirring and mixing of the curing agent and the soil, improving the mixing uniformity, reducing the problem of insufficient local reinforcement, enhancing the mixing efficiency, and accelerating the construction speed; the first group and the second group of blades are respectively connected to the inner and outer drill pipes, forming upper and lower mixing flow fields during the mixing process, enhancing the hybrid power of the soil and the curing agent, enabling comprehensive mixing of the soil and the curing agent from the bottom to the periphery of the drill pipe, improving the mixing uniformity, eliminating the need for repeated mixing multiple times, reducing the mixing duration, and thus enhancing the construction efficiency.

[0011] Optionally, it further includes a lubricating member, and the inner drill pipe and the outer drill pipe are rotationally connected through the lubricating member.

[0012] By adopting the above technical solution, the positional and structural relationship between the inner drill pipe and the outer drill pipe is clarified, reducing the possibility of collision between the inner drill pipe and the outer drill pipe during rotation. At the same time, the use of the lubricating member enhances the smoothness of the rotational connection between the inner drill pipe and the outer drill pipe, reduces the friction force between the inner drill pipe and the outer drill pipe, reduces power consumption, makes the device more efficient during mixing and drilling, and thus improves the construction efficiency.

[0013] Optionally, the first group of blades includes a first-layer blade and a second-layer blade. The first-layer blade is located at the bottom of the second-layer blade, and both the first-layer blade and the second-layer blade are connected to the outer wall of the inner drill pipe; the second group of blades includes a third-layer blade and a fourth-layer blade. The third-layer blade is located at the bottom of the fourth-layer blade, and both the third-layer blade and the fourth-layer blade are fixed to the outer wall of the outer drill pipe. The powder outlet is located between the first-layer blade and the second-layer blade.

[0014] By adopting the above technical solution, from the bottom to the top of the main rod part, the first-layer blade, the second-layer blade, the third-layer blade, and the fourth-layer blade are arranged in sequence, forming a well-defined mixing area, which not only increases the layering of mixing but also strengthens the hybrid power of the soft soil and the curing agent through the multi-stage disturbance of the blades, making the mixing effect of the blades on the soil deeper and more extensive. The curing agent is arranged between the first-layer blade and the second-layer blade, and the curing agent can be directly sprayed into the active mixing area formed by the blades, enabling the immediate mixing of the curing agent and the soil, reducing mixing dead corners, improving the continuity and efficiency of mixing, and thus enhancing the construction efficiency.

[0015] Optionally, the extended cross-section of the first-layer blade is trapezoidal.

[0016] By adopting the above technical solution, the front end of the blade with a trapezoidal cross-section is narrow and has a certain thickness, which can effectively cut into the soil and is not easily damaged. At the same time, it can also reduce the cutting resistance, contribute to quickly positioning and starting the mixing process. When in a hard soil layer or an environment with obstacles, stronger shear force can be generated during rotation, quickly breaking soil particles, promoting the mixing of soil and curing agent, ensuring the uniformity of mixing, reducing the number of times of repeated mixing required, and thus improving the overall efficiency.

[0017] Optionally, the number of the first-layer blades is two, the number of the second-layer blades is two, and they are both circumferentially distributed around the outer wall of the inner drill rod. The first-layer blades and the second-layer blades are arranged in a cross shape.

[0018] By adopting the above technical solution, the cross-shaped arrangement enables the first-layer blades and the second-layer blades to form an interleaved mixing flow during the mixing process, allowing the soil or mixture to be fully mixed on different levels, reducing the areas that do not fully contact the curing agent, and thus improving the mixing uniformity and the overall reinforcement effect.

[0019] Optionally, the first-layer blades and the second-layer blades are arranged in a spiral staggered distribution, the third-layer blades and the fourth-layer blades are arranged in a spiral staggered distribution, and the spiral direction is opposite to that of the first-layer blades and the second-layer blades.

[0020] By adopting the above technical solution, the inner drill rod and the outer drill rod rotate in opposite directions. The spiral directions of the first-layer blades and the second-layer blades are consistent with the rotation direction of the inner drill rod, and the spiral directions of the third-layer blades and the fourth-layer blades are consistent with the rotation direction of the inner drill rod, enabling the first-layer blades, the second-layer blades, the third-layer blades, and the fourth-layer blades to rotate smoothly in the soil layer, reducing the resistance, and improving the drilling efficiency of the blade part.

[0021] Optionally, the first-layer blades are detachably connected to the inner drill rod.

[0022] By adopting the above technical solution, the first-layer blades are installed at the bottom of the main rod part. When the device starts, the first-layer blades at the bottom first contact the soil and need to overcome the initial static resistance of the soil, increasing the load on the blades. The first-layer blades are easily damaged, resulting in a decrease in the ability of the first-layer blades to cut into the soil and a reduction in the mixing speed of the device. To maintain the construction efficiency of the device, the device needs to be repaired or replaced. The detachable connection between the first-layer blades and the inner drill rod allows the damaged first-layer blades to be directly replaced instead of the entire component, reducing the maintenance cost, extending the overall service life of the equipment, and at the same time maintaining the soil cutting efficiency, thereby improving the construction efficiency.

[0023] Optionally, the inner drill pipe includes an inner rod portion and an insertion rod portion. The inner rod portion is rotatably connected to the outer drill pipe. The inner rod portion penetrates through the insertion rod portion. A locking member is provided on the outer side of the insertion rod portion. The insertion rod portion is fixed to the inner rod portion through the locking member. The outer side of the insertion rod portion is connected to the fourth-layer blade, and the bottom of the insertion rod portion is in a pointed shape.

[0024] By adopting the above technical solution, when the device is inserted into the soil, the pointed end of the insertion rod portion first cuts in, and then the first-layer blade cuts in on the soil surface. When encountering hard lumps, the tip of the insertion rod portion and the first-layer blade are both easily damaged. Connect the first-layer blade to the insertion rod portion. The insertion rod portion is installed on the inner rod portion through the locking member. When replacing the first-layer blade, the first-layer blade and the insertion rod portion are replaced together, improving the stability of the drilling efficiency of the insertion rod portion and the first-layer blade.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. Compared with unidirectional single-axis mixing, by setting the inner drill pipe and the outer drill pipe, the inner drill pipe and the outer drill pipe can rotate simultaneously to form two mixing centers. The first group of blades and the second group of blades mix the soil at different levels, and the rotation directions of the first group of blades and the second group of blades are opposite. When the inner drill pipe penetrates into the soil and the powder spraying pipe performs powder spraying operations, it promotes the mixing and diffusion of the curing agent under the mixing action of the first group of blades on the soil layer. The second group of blades operates in the area stirred by the first group of blades. The second group of blades stir the soil in the opposite stirring direction to the first group of blades, performing reverse rotation stirring and mixing of the curing agent and the soil, improving the mixing uniformity, reducing the problem of insufficient local reinforcement, increasing the mixing efficiency, and accelerating the construction speed; The first group and the second group of blades are respectively connected to the inner and outer drill pipes, forming upper and lower two mixing flow fields during the mixing process, enhancing the hybrid power of the soil and the curing agent, enabling comprehensive mixing of the soil and the curing agent from the bottom to the surrounding of the drill pipe, improving the mixing uniformity, eliminating the need for repeated mixing multiple times, reducing the mixing duration, and thus enhancing the construction efficiency;

[0027] 2. From the bottom to the top along the main rod portion, the first-layer blade, the second-layer blade, the third-layer blade, and the fourth-layer blade are arranged in sequence, forming a well-defined mixing area, which not only increases the mixing hierarchy but also, through the multi-stage disturbance of the blades, strengthens the hybrid power of the soft soil and the curing agent, making the mixing effect of the blades on the soil deeper and wider. The curing agent is arranged between the first-layer blade and the second-layer blade, and the curing agent can be directly sprayed into the active mixing area formed by the blades, enabling the curing agent and the soil to be instantaneously mixed, reducing the mixing dead angle, improving the mixing continuity and efficiency, and thus enhancing the construction efficiency;

[0028] When the device is inserted into the soil, the sharp end of the insertion rod part cuts in first, and then the first layer of blades cuts in on the soil surface. When encountering hard lumps, the tips of the insertion rod part and the first layer of blades are both prone to damage. Connect the first layer of blades to the insertion rod part. The insertion rod part is installed on the inner rod part through a locking part. When replacing the first layer of blades, the first layer of blades and the insertion rod part are replaced together, improving the drilling efficiency stability of the insertion rod part and the first layer of blades. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application.

[0030] Figure 2 It is a half-sectional view of the overall structure in the embodiment of the present application.

[0031] Description of the Reference Numerals:

[0032] 1. Main rod part; 11. Inner drill rod; 111. Powder outlet; 112. Inner rod part; 113. Insertion rod part; 12. Outer drill rod; 2. Powder spraying pipe; 3. First group of blades; 31. First layer of blades; 32. Second layer of blades; 4. Second group of blades; 41. Third layer of blades; 42. Fourth layer of blades; 5. Lubricating part; 6. Locking part; 7. Fixing part. Detailed Description of the Embodiment

[0033] The following will further describe the present application in detail Figure 1-2 in conjunction with the appended drawings.

[0034] The embodiment of the present application discloses a construction device for a cement powder jet double - way mixing pile machine.

[0035] Embodiment 1

[0036] Referring to Figure 1 and Figure 2 , the construction device for a cement powder jet double - way mixing pile machine includes a main rod part 1, a powder spraying pipe 2 and a blade part. The main rod part 1 includes an inner drill rod 11 and an outer drill rod 12. The bottom end of the inner drill rod 11 is in a sharp - angled shape. The inner drill rod 11 and the outer drill rod 12 are coaxial. The outer drill rod 12 is sleeved on the top of the inner drill rod 11. The inner drill rod 11 and the outer drill rod 12 are rotatably connected. The inner drill rod 11 is hollow. The powder spraying pipe 2 is located inside the inner drill rod 11. A powder outlet 111 is opened at the bottom of the inner drill rod 11. The powder - spraying end of the powder spraying pipe 2 is inserted into the powder outlet 111. The powder spraying pipe 2 is fixed to the inner drill rod 11. The blade part includes a first group of blades 3 and a second group of blades 4. The first group of blades 3 is located at the bottom of the second group of blades 4. The first group of blades 3 is fixed to the outer wall of the inner drill rod 11. The second group of blades 4 is fixed to the outer wall of the outer drill rod 12.

[0037] When performing solidification operation on the soil, the bottom wall of the inner drill pipe 11 is close to the soil area to be solidified. The inner drill pipe 11 rotates and penetrates into the soil layer while rotating. The first set of blades 3 is fixed to the outer wall of the inner drill pipe 11. When the inner drill pipe 11 rotates, the first set of blades 3 rotates following the rotation of the inner drill pipe 11. The first set of blades 3 cuts into the soil surface. As the inner drill pipe 11 continues to penetrate, the first set of blades 3 cuts and stirs the soil under the action of rotation, making the soil soft. The powder spraying pipe 2 sprays the solidifying agent into the soil being stirred. The first set of blades 3 stirs and mixes the soil and the solidifying agent. At the same time, as the inner drill pipe 11 penetrates deeper, the outer drill pipe 12 rotates and drives the second set of blades 4 to rotate. The second set of blades 4 moves following the moving direction of the inner drill pipe 11. The second set of blades 4 agitates the area stirred by the first set of blades 3 again to improve the mixing effect of the soil and the fixing agent. When the outer drill pipe 12 rotates, the rotation direction of the outer drill pipe 12 is opposite to that of the inner drill pipe 11, so that the rotation direction of the first set of blades 3 is opposite to that of the second set of blades 4. When the second set of blades 4 performs secondary stirring in the area stirred by the first set of blades 3, the second set of blades 4 performs reverse stirring on the mixture of the soil and the solidifying agent, further improving the mixing effect of the soil and the solidifying agent. When the inner drill pipe 11 withdraws from the soil, the inner drill pipe 11 rotates and returns along the original path, stirring and mixing the soil and the solidifying agent again, further improving the mixing efficiency of the soil and the solidifying agent, and there is no need to repeatedly lift the inner drill pipe 11 to make the soil and the solidifying agent fully and evenly mixed, thus improving the construction efficiency.

[0038] In addition, the bottom end of the inner drill pipe 11 is in a sharp angle shape, reducing the resistance of drilling into the soil, enabling the inner drill pipe 11 to quickly penetrate the soft soil layer, and effectively disturbing the soil at the initial stage of stirring, laying a foundation for subsequent efficient stirring.

[0039] The first set of blades 3 includes a first layer of blades 31 and a second layer of blades 32. The first layer of blades 31 is evenly distributed around the inner drill pipe 11, and the second layer of blades 32 is evenly distributed around the inner drill pipe 11. The first layer of blades 31 is located at the bottom of the second layer of blades 32. Both the first layer of blades 31 and the second layer of blades 32 are fixed to the outer wall of the inner drill pipe 11. The second set of blades 4 includes a third layer of blades 41 and a fourth layer of blades 42. The third layer of blades 41 is evenly distributed around the outer drill pipe 12, and the fourth layer of blades 42 is evenly distributed around the outer drill pipe 12. The third layer of blades 41 is located at the bottom of the fourth layer of blades 42. Both the third layer of blades 41 and the fourth layer of blades 42 are fixed to the outer wall of the outer drill pipe 12. The powder outlet 111 is located between the first layer of blades 31 and the second layer of blades 32, and the second layer of blades 32 is located at the bottom of the third layer of blades 41.

[0040] From the bottom to the top of the main rod part 1, the first-layer blades 31, the second-layer blades 32, the third-layer blades 41, and the fourth-layer blades 42 are arranged in sequence. When the fourth-layer blades 42 penetrate into the soil, under the rotational action of the inner drill rod 11 and the outer drill rod 12, the first-layer blades 31, the second-layer blades 32, the third-layer blades 41, and the fourth-layer blades 42 stir the soil, causing the soil to be stirred simultaneously under the action of the four layers of blades. The powder spraying pipe 2 sprays the curing agent into the soil, which is uniformly mixed with the soil under the stirring action, improving the mixing efficiency of the soil and the curing agent.

[0041] To improve the smoothness of the first-layer blades 31 cutting into the soil, the extended cross-section of the first-layer blades 31 is trapezoidal.

[0042] In this embodiment, the number of the first-layer blades 31 is two, the number of the second-layer blades 32 is two, the first-layer blades 31 and the second-layer blades 32 are arranged in a cross shape, the number of the third-layer blades 41 is two, the number of the fourth-layer blades 42 is two, and the third-layer blades 41 and the fourth-layer blades 42 are arranged in a cross shape.

[0043] The cross-shaped arrangement enables the first-layer blades 31 and the second-layer blades 32 to form staggered stirring flows during the stirring process, and the third-layer blades 41 and the fourth-layer blades 42 to form staggered stirring flows, so that the soil or mixture is fully mixed on different levels, reducing the areas that do not fully contact the curing agent, thereby improving the uniformity of stirring and the overall strengthening effect.

[0044] The first-layer blades 31 and the second-layer blades 32 are arranged in a spiral offset distribution, and the third-layer blades 41 and the fourth-layer blades 42 are arranged in a spiral offset distribution, and the spiral direction is opposite to that of the first-layer blades 31 and the second-layer blades 32.

[0045] When the inner drill rod 11 and the outer drill rod 12 rotate in the opposite direction, the spiral directions of the first-layer blades 31 and the second-layer blades 32 are consistent with the rotation direction of the inner drill rod 11, and the spiral directions of the third-layer blades and the fourth-layer blades 42 are consistent with the rotation direction of the inner drill rod 11, enabling the first-layer blades 31, the second-layer blades 32, the third-layer blades 41, and the fourth-layer blades 42 to rotate smoothly in the soil layer, reducing the resistance and improving the drilling efficiency of the blade part.

[0046] The implementation principle of the embodiment of the present application is as follows: When soil solidification operation is required, the tip of the inner drill pipe 11 is placed in the area to be solidified. The inner drill pipe 11 rotates and penetrates deep into the soil. While penetrating, the outer drill pipe 12 rotates in the opposite direction to the inner drill pipe 11. The two first-layer blades 31 and the two second-layer blades 32 on the inner drill pipe 11 rotate with the inner drill pipe 11, and the two third-layer blades 41 and the two fourth-layer blades 42 on the outer drill pipe 12 rotate with the outer drill pipe 12, performing two-way agitation in the soil, improving the mixing efficiency of the soil and the curing agent, reducing the construction time, and improving the construction efficiency.

[0047] Embodiment 2

[0048] The difference from Embodiment 1 is that, referring to Figure 2 , the cement powder jet two-way mixing pile construction device further includes a lubricating member 5. The lubricating member 5 is located at the bottom of the outer drill pipe 12. The lubricating member 5 is sleeved and fixed on the outer wall of the inner drill pipe 11. The outer wall of the lubricating member 5 is slidably connected to the inner wall of the outer drill pipe 12. The inner drill pipe 11 and the outer drill pipe 12 are rotationally connected through the lubricating member 5.

[0049] The implementation principle of the embodiment of the present application is: To connect the structures between the outer drill pipe 12 and the inner drill pipe 11, the lubricating member 5 supports the outer drill pipe 12 and the inner drill pipe 11, reducing the possibility of shaking and collision when the outer drill pipe 12 and the inner drill pipe 11 rotate, improving the construction stability of the outer drill pipe 12 and the inner drill pipe 11, enabling the construction to proceed smoothly, and further improving the construction efficiency.

[0050] Embodiment 3

[0051] The difference from the above embodiments is that, referring to Figure 2 , the first-layer blade 31 is detachably connected to the inner drill pipe 11. When the first-layer blade 31 is damaged, it is not necessary to replace the entire device. Only the first-layer blade 31 needs to be replaced, saving costs. At the same time, the newly disassembled and replaced first-layer blade 31 can perform smooth soil cutting operations, reducing the possibility of slow soil cutting speed caused by damage to the first-layer blade 31, and improving the construction efficiency.

[0052] The inner drill pipe 11 includes an inner rod portion 112 and an inserting rod portion 113. The inner rod portion 112 is rotatably connected to the outer drill pipe 12. An opening is formed at the top of the inner rod portion 112. The powder spraying pipe 2 enters the inner rod portion 112 from the opening of the inner rod portion 112. The powder outlet 111 is formed through the inner wall of the inner rod portion 112. The inner rod portion 112 is inserted into the inserting rod portion 113. A locking member 6 is arranged on the outer side of the inserting rod portion 113. The inserting rod portion 113 is fixed to the inner rod portion 112 through the locking member 6. The outer side of the inserting rod portion 113 is fixed to the fourth layer of blades 42. The bottom of the inserting rod portion 113 is in a sharp angle shape. Specifically, the locking member 6 is inserted radially into the inserting rod portion 113. The outer wall of the locking member 6 is threadedly connected to the bottom of the inner rod portion 112. A fixing member 7 is threadedly connected to one end of the locking member 6 away from the inserting rod portion 113. The fixing member 7 abuts against the inserting rod portion 113.

[0053] The implementation principle of the embodiment of the present application is as follows: The sharp end of the inserting rod portion 113 is used as the starting point for entering the soil and is extremely likely to be damaged. The inserting rod portion 113 is installed on the inner rod portion 112 through the locking member 6. When replacing the first layer of blades 31, the first layer of blades 31 and the inserting rod portion 113 are replaced together, improving the stability of the soil drilling efficiency of the inserting rod portion 113 and the first layer of blades 31.

[0054] The above are all the preferred embodiments of the present application. This embodiment is only an explanation of the present application and does not limit the protection scope of the present application in turn. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. Cement powder spraying bidirectional mixing pile machine construction device, characterized in that: include: The main rod part (1) comprises an inner drill rod (11) and an outer drill rod (12), wherein the bottom end of the inner drill rod (11) is pointed, the outer drill rod (12) is coaxial with the inner drill rod (11), and the inner drill rod (11) and the outer drill rod (12) are rotatably connected; A powder spraying pipe (2) is located inside the inner drill rod (11); the inner drill rod (11) is provided with a powder outlet (111); and a powder outlet end of the powder spraying pipe (2) is fixed at the powder outlet (111); The blade part comprises a first group of blades (3) and a second group of blades (4), wherein the first group of blades (3) is located at the bottom of the second group of blades (4), the first group of blades (3) is connected to the inner drill rod (11), and the second group of blades (4) is connected to the outer drill rod (12).

2. The cement powder spraying bidirectional mixing pile machine construction device according to claim 1 is characterized in that: It also comprises a lubricating member (5), and the inner drill rod (11) and the outer drill rod (12) are rotationally connected via the lubricating member (5).

3. The cement powder spraying bidirectional mixing pile machine construction device according to claim 1 is characterized in that: The first group of blades (3) comprises a first layer of blades (31) and a second layer of blades (32); the first layer of blades (31) is located at the bottom of the second layer of blades (32); the first layer of blades (31) and the second layer of blades (32) are both connected to the outer wall of the inner drill rod (11); the second group of blades (4) comprises a third layer of blades (41) and a fourth layer of blades (42); the third layer of blades (41) is located at the bottom of the fourth layer of blades (42); the third layer of blades (41) and the fourth layer of blades (42) are both fixed to the outer wall of the outer drill rod (12); and the powder outlet (111) is located between the first layer of blades (31) and the second layer of blades (32).

4. The cement powder spraying bidirectional mixing pile machine construction device according to claim 3 is characterized in that: The extended cross section of the first layer of blades (31) is in a trapezoidal shape.

5. The cement powder spraying bidirectional mixing pile machine construction device according to claim 3 is characterized in that: The number of the first layer blades (31) is two, and the number of the second layer blades (32) is two, and both are circumferentially distributed around the outer wall of the inner drill rod (11), and the first layer blades (31) and the second layer blades (32) are arranged crosswise in a cross shape.

6. The cement powder spraying bidirectional mixing pile machine construction device according to claim 3, characterized in that: The first layer of blades (31) and the second layer of blades (32) are distributed in a spiral staggered manner, and the third layer of blades (41) and the fourth layer of blades (42) are distributed in a spiral staggered manner, and the spiral direction is opposite to the spiral direction of the first layer of blades (31) and the second layer of blades (32).

7. The cement powder spraying bidirectional mixing pile machine construction device according to claim 3, characterized in that: The first layer of blades (31) is detachably connected to the inner drill rod (11).

8. The cement powder spraying bidirectional mixing pile machine construction device according to claim 7, characterized in that: The inner drill rod (11) comprises an inner rod portion (112) and an insertion rod portion (113); the inner rod portion (112) is rotatably connected to the outer drill rod (12); the inner rod portion (112) is inserted into the insertion rod portion (113); a locking piece (6) is provided on the outer side of the insertion rod portion (113); the insertion rod portion (113) is fixed to the inner rod portion (112) via the locking piece (6); the outer side of the insertion rod portion (113) is connected to the fourth layer of blades (42); and the bottom of the insertion rod portion (113) is pointed.

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