A mixing pile machine drill bit and construction method for improving construction quality of a cement-soil retaining wall

Abstract

The application discloses a mixing pile machine drill bit for improving the construction quality of a cement-soil retaining wall and a construction method, the drill bit can accurately control the cement slurry discharging speed and flow through air bag extrusion and blade stirring, so that real-time monitoring and feedback on different soil body depths can be realized. In addition, a plurality of wings and cutting wings are arranged on the drill bit, so that the cement slurry can be fully diffused to the edge of the pile body and fully stirred with the soil slurry, and the piling quality of the cement-soil pile is improved. By changing the number of wings, the cement mixing amount can be adjusted in real time, so that the construction effect is optimized. The drill bit is simple to operate, and the discharging pump does not need to be frequently adjusted, so that manpower and material resources are saved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of geotechnical engineering supporting structure construction, and particularly relates to a mixing pile machine drill bit for improving the construction quality of a cement-soil retaining wall. BACKGROUND

[0002] As the main force structure of a grid-type gravity retaining wall in a soft soil area, a cement-soil mixing pile is a kind of structure using cement as a main solidifying agent, spraying cement into soil and fully mixing the cement and soil by a mixing pile machine to make the soft soil harden into a pile through a series of physical and chemical reactions. The cement-soil mixing piles are connected to form a retaining wall entity which uses gravity to stop the soil. The cement mixing pile is divided into single-axis, double-axis and triple-axis mixing piles according to the main construction method. The traditional cement mixing pile machine has some problems in the pile forming method, such as poor flowability of the cement slurry in the soil, difficulty in uniform diffusion, large accumulation of the cement slurry near the spraying nozzle, serious shortage of the slurry at a position far away from the nozzle, and easy blockage of the spraying nozzle by the broken soil, which naturally leads to the lack of cement slurry in the soil, so that the cement-soil of the pile after mixing is not dense and uniform, and the pile forming quality is seriously reduced. In addition, the demand for the cement slurry is inconsistent at different depths and in different soil bodies, but the traditional cement mixing pile machine can only spray the cement slurry with a constant flow, which will cause the pile forming quality of the poor soil layer to not meet the bearing capacity requirement, and will also cause the waste of the cement slurry in the high-quality soil layer, and the real-time adjustment of the cement slurry flow cannot be made according to the specific soil quality. SUMMARY

[0003] The purpose of the present application is to provide a mixing pile machine drill bit for improving the construction quality of a cement-soil retaining wall according to the above-mentioned deficiencies of the prior art. The drill bit controls the cement slurry flow at different depths and in different soil bodies by inflating the air bag to extrude the cement slurry into the soil through gas transmission, and improves the pile forming quality by mixing the cement slurry with the soil through the mixing of the outwardly inclined blades. At the same time, the electronic monitoring device installed on the upper and lower blades monitors the cement content by using the different characteristics of the resistance of different soil bodies and different cement contents, and feeds back the relevant information to the control console in real time, thereby guiding the subsequent construction of the mixing pile machine.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0005] A mixing pile machine drill bit for improving the construction quality of a cement-soil retaining wall, wherein a drill rod is provided with a plurality of slurry outlets for discharging cement slurry, and a drill cone is welded at the end of the drill rod, and two blades are welded on the left and right sides of the drill rod,

[0006] The blades are divided into upper blades and lower blades, and the blades are provided with through bolt holes, and the blades are divided into upper sliding grooves and lower sliding grooves;

[0007] The upper sliding grooves of the upper blades are fixed with monitoring flaps through bolt holes using fixing bolts, and the lower sliding grooves are fixed with cutting flaps through bolt holes using fixing bolts.

[0008] The lower slide groove on the lower blade fixes the monitoring wing piece by using fixing bolts through the bolt holes, and the upper slide groove fixes the cutting wing piece by using fixing bolts through the bolt holes;

[0009] The monitoring wing piece has monitoring wing piece bolt holes on the monitoring wing piece base, is slid into the lower slide groove and the upper slide groove through the monitoring wing piece base, and is fixed to the blade by using fixing bolts.

[0010] Further, the monitoring wing piece is provided with a monitoring wing piece cutting piece, and the monitoring wing piece cutting piece is provided with a monitoring wing piece resistance monitoring element on the front face.

[0011] Further, the cutting wing piece has cutting wing piece bolt holes on the cutting wing piece base, is slid into the lower slide groove and the upper slide groove through the cutting wing piece base, and is fixed to the blade by using fixing bolts.

[0012] Further, the cutting wing piece is provided with a cutting wing piece cutting piece, and the cutting wing piece cutting piece has a certain inclination angle with the cutting wing piece base.

[0013] Further, the inside of the drill rod is fixed with an air channel, the air channel is fixed with an air bag baffle, and the air bag baffle is fixed with an inflatable air bag below.

[0014] Further, the air channel inside the air bag is provided with symmetrical air outlet holes; the upper part of the air channel is fixed with a fixed rotating shaft, and the fixed rotating shaft is connected with a back slurry baffle in the drill rod.

[0015] Further, the fixed rotating shaft is fixed with a rotating slurry outlet piece, the slurry outlet piece rotates around the fixed rotating shaft below the back slurry baffle, and can completely block the cavity between the back slurry baffle and the fixed rotating shaft, thereby preventing the backflow of cement slurry;

[0016] The construction method of the improved cement-soil retaining wall construction quality mixing pile machine drill bit specifically includes the following steps:

[0017] S1, before implementing the cement-soil mixing pile retaining wall construction, the stratum of the construction area should be explored in detail, and the main exploration results should include the properties, soil types, strength indexes and underground water distribution of each soil layer in the construction cement-soil mixing pile area; after obtaining the exploration data of each soil layer, the obtained soil body at each depth is added with cement slurry to form a cuboid sample on the ground, and the samples with different contents of cement slurry are measured in resistance under a certain voltage to form a one-to-one correspondence experiment result of cement content and resistance characteristics;

[0018] S2, the upper slide of the upper blade and the lower slide of the lower blade are each installed with an even number of monitoring wings; the lower slide of the upper blade and the upper slide of the lower blade are each installed with a plurality of cutting wings; the monitoring wing resistance monitoring element of the monitoring wing transmits information to the ground control console through an electronic signal; if the pile drilling is not ideal, the cutting wings are increased or decreased on the basis of the original, so that the drilling process and the mixing process are more efficient;

[0019] S3, connect the drill rod to the rotating shaft of the mixing pile machine, move the pile machine to the construction site for construction, the drill cone, cutting wings and monitoring wings efficiently cut the soil, move the drill bit underground, reach the cement-soil pile bottom elevation, move the drill bit upwards and start spraying cement slurry, the cement slurry is transported from the ground to the slurry outlet hole through the drill rod, and is thrown out to the outside of the pile body under the centrifugal force of the cutting wings of the upper and lower blades, so that the cement slurry is taken away from the center of the shaft, and the cement content of the whole cross section of the cement pile remains consistent;

[0020] S4, when the soil quality of part of the depth is poor, inflate the air bag by the air pump on the ground through the air duct, high-pressure gas enters the air bag through the air outlet hole on the air duct, the air bag inflates and expands, squeezing the cement slurry between the air bag and the drill rod to accelerate the discharge of the cement slurry to the soil through the slurry outlet hole, thereby increasing the cement content in the soil area under the condition that the pile forming speed remains unchanged;

[0021] S5, the air duct is fixed with an air bag baffle at a position above the air bag to prevent the air bag from blocking the slurry discharge pipeline after inflation; and a slurry outlet piece is fixed above the air bag baffle, which can only rotate to the west side due to the blockage of the backflow baffle; when the cement slurry flows from the ground to the drill bit, the slurry outlet piece opens under the impact force to ensure normal transportation of the cement slurry, and if the cement slurry is not easily sprayed to the soil due to excessive pressure, the slurry outlet piece automatically closes under the pressure of the downside to prevent the cement slurry from flowing back to the ground;

[0022] S6, during the rotation of the drill bit, there will always be a cubic soil body between the two monitoring wings, and the monitoring wing resistance monitoring element monitors the resistance data of the cubic soil body in real time, so as to calculate whether the cement content meets the design strength requirement through the correspondence between the cement content and the resistance characteristics obtained by pre-construction experiment, and if not, increase the amount of cement slurry in the soil layer;

[0023] Further, the monitoring wing resistance monitoring element should be fixed firmly in the monitoring wing monitoring element fixing hole, and the power supply should be sufficient before each cement pile construction; when monitoring the resistance of the cubic soil body, the rotation speed of the drill bit should be slowed down.

[0024] Further, when the air bag is inflated to speed up the cement slurry injection, the inflation speed should be controlled to prevent too fast speed from causing severe disturbance to the soil around the drill bit; the fixed rotating shaft should be provided with a limiting device, and the slurry outlet piece should always maintain an angle of less than degrees with the slurry return blocking piece on the side, otherwise, the backflow prevention device will be ineffective.

[0025] Compared with the prior art, the high-efficiency cement-soil retaining wall construction quality improving mixing pile machine drill bit can improve the pile construction quality of the cement-soil pile according to the actual situation of different soil bodies and different depths, and realize real-time monitoring, real-time feedback and real-time adjustment.

[0026] The air bag extrusion method for adjusting the slurry outlet speed of the cement slurry is faster and more real-time than the traditional ground slurry pump, and is simple to operate, saves effort and avoids the tedious operation of adjusting the slurry pump multiple times.

[0027] In addition, the installation of multiple wing pieces on the upper and lower blades and the inclined cutting pieces of the cutting wing pieces ensure that the cement slurry is fully diffused to the edge of the pile body and the soil slurry is fully mixed, thereby providing higher guarantee for the pile construction quality of the cement-soil pile.

[0028] Finally, the monitoring wing piece for adjusting the spacing can monitor the construction soil condition in real time, eliminate quality hidden dangers during the construction stage, and effectively solve the hysteresis of detection after the construction is completed. BRIEF DESCRIPTION OF DRAWINGS

[0029] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0030] Figure 1 is a structure top view of the high-efficiency cement-soil retaining wall construction quality improving mixing pile machine drill bit in the present application;

[0031] Figure 2 is a structure bottom view of the high-efficiency cement-soil retaining wall construction quality improving mixing pile machine drill bit in the present application;

[0032] Figure 3 is a structure partial sectional view of the mixing pile machine drill bit in the present application;

[0033] Figure 4 is a schematic view of the internal air passage structure in the present application;

[0034] Figure 5 is an internal air bag and backflow prevention device in the present application;

[0035] Figure 6 is a cement mixing pile machine drill bit cutting middle wing piece;

[0036] Figure 7 is a cement mixing pile machine drill bit cutting monitoring upper and lower wing piece;

[0037] Figure: 1, drill pipe; 2, blade; 3, air channel; 4, monitoring wing; 5, cutting wing; 6, drill cone; 7, slurry outlet; 8, air bag; 9, backflow prevention device; 21, lower slide groove; 22, upper slide groove; 23, fixing bolt; 24, bolt hole; 31, air bag baffle; 32, air outlet; 41, monitoring wing bolt hole; 42, monitoring wing base; 43, monitoring wing cutting piece; 44, monitoring wing resistance monitoring element; 45, monitoring wing monitoring element fixing hole; 51, cutting wing bolt hole; 52, cutting wing base; 53, cutting wing cutting piece; 91, slurry backflow baffle; 92, slurry outlet piece; 93, fixed rotating shaft; DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0039] Embodiment one

[0040] Please refer to Figures 1-7This invention provides a technical solution: a drilling bit for a mixing pile machine that improves the construction quality of cement-soil retaining walls. The drill rod 1 has 16 grout outlet holes 7 for discharging cement grout, and a drill cone 6 is welded to the end of the drill rod 1. Two blades 2 are welded to each side of the drill rod 1, and each blade 2 is divided into an upper blade and a lower blade. Each blade 2 has a through bolt hole 24, and is further divided into an upper sliding groove 22 and a lower sliding groove 21. The upper sliding groove 22 of the upper blade 2 is secured to a monitoring blade 4 using fixing bolts 23 through the bolt holes 24, and the lower sliding groove 21 is secured to a cutting blade 5 using fixing bolts 23 through the bolt holes 24. Similarly, the lower sliding groove 21 of the lower blade 2 is secured to a monitoring blade 4 using fixing bolts 23 through the bolt holes 24, and the upper sliding groove 22 is secured to a cutting blade 5 using fixing bolts 23 through the bolt holes 24. The monitoring blade 4 has a monitoring blade bolt hole 41 in its base 42, and slides into the lower sliding groove 21 and upper sliding groove 22 through the base 42, and is then fixed to the blade 2 using fixing bolts 23. The monitoring blade 4 has a monitoring blade cutting blade 43, which is also used to cut the soil. The front of the monitoring blade cutting blade 43 is equipped with a monitoring blade resistance monitoring element 44. The cutting blade 5 has a cutting blade bolt hole 51 in the cutting blade base 52. It slides into the lower sliding groove 21 and the upper sliding groove 22 through the cutting blade base 52 and is fixed to the blade with a fixing bolt 23. The cutting blade 5 has a cutting blade cutting blade 53, which has a certain tilt angle with the cutting blade base 52. An air passage 3 is fixed inside the drill rod 1. The air passage 3 fixes the air bag baffle 31. An inflatable air bag 8 is fixed below the air bag baffle 31. After inflation, the air bag 8 becomes cylindrical and is placed between the drill rod 1 and the air passage 3. The air passage 3 inside the airbag 8 has symmetrical air outlet holes 32; a fixed rotating shaft 93 is fixed on the upper part of the air passage 3, and a slurry return baffle 91 is connected to the fixed rotating shaft 93 inside the drill rod 1; a rotating slurry outlet plate 92 is fixed on the fixed rotating shaft 93, and the slurry outlet plate 92 rotates around the fixed rotating shaft 93 under the slurry return baffle 91, and can completely block the cavity between the slurry return baffle 91 and the fixed rotating shaft 93, so as to prevent the cement slurry from flowing back.

[0041] Example 2:

[0042] like Figures 1-7 As shown, this embodiment specifically relates to a method for using a mixing pile drill bit to improve the construction quality of cement-soil retaining walls, which includes the following steps:

[0043] S1, before the construction of the cement-soil mixing pile retaining wall, the stratum of the construction area should be explored in detail, and the main results of the exploration should include the properties of each soil layer in the construction area of the cement-soil mixing pile, the soil type, the strength index (such as the friction angle and the cohesive force), and the distribution of underground water, etc. After obtaining the exploration data of each soil layer, the cement slurry obtained at each depth of the soil body should be added to the ground to form a cuboid sample, and the resistance of the sample with different contents of the cement slurry is measured under a certain voltage to form the experimental results of the one-to-one correspondence between the cement content and the resistance characteristics.

[0044] S2, the upper chute 22 of the upper blade 2 and the lower chute 21 of the lower blade 2 are each installed with an even number of monitoring wings 4; the lower chute 21 of the upper blade 2 and the upper chute 22 of the lower blade 2 are each installed with a plurality of cutting wings 5. The monitoring wing resistance monitoring element 44 of the monitoring wing 4 transmits information to the ground control console through an electronic signal; if the piling drilling condition is not ideal, the cutting wings 5 are increased or decreased on the basis of the original, so that the drilling process and the mixing process are more efficient;

[0045] S3, the drill rod 1 is connected to the rotating shaft of the mixing pile machine, the machine is moved to the construction site for construction, the soil is efficiently cut by the drill cone 6, the cutting wing 5 and the monitoring wing 4, the drill bit moves underground, reaches the bottom elevation of the cement-soil pile, moves the drill bit upward and starts to spray the cement slurry, the cement slurry is transported from the ground to the slurry outlet hole 7 through the drill rod 1, and is thrown out to the outside of the pile body under the centrifugal action of the inclined cutting wing cutting piece 53 of the cutting wing 5 of the upper and lower blades 2, so as to take the cement slurry away from the axial region, so that the cement content of the whole cross section of the cement pile remains consistent;

[0046] S4, when the soil quality of part of the depth is poor, the air pump on the ground fills the air bag 8 through the air channel 3, the high-pressure gas passes through the air outlet hole 32 on the air channel 3 to the air bag 8, the air bag 8 is inflated and expanded, and the cement slurry between the air bag 8 and the drill rod 1 is squeezed to accelerate through the slurry outlet hole 7 to the soil body, thereby increasing the cement content in the soil body region under the condition that the piling speed remains unchanged;

[0047] S5, the air channel 3 is fixed with an air bag baffle 31 at a position above the air bag 8, which prevents the air bag 8 from blocking the slurry discharge pipeline after expansion; and a slurry outlet piece 92 is fixed above the air bag baffle 31, which can only rotate to the west side due to the blockage of the backflow baffle 91. When the cement slurry flows from the ground to the drill bit, the slurry outlet piece 92 opens under the impact force to ensure the normal transportation of the cement slurry, and if the cement slurry is not easily sprayed to the soil body due to excessive pressure, the slurry outlet piece 92 automatically closes under the pressure of the lower side to prevent the cement slurry from flowing back to the ground;

[0048] S6. During the rotation of the drill bit, there will always be a cubic soil body between the two monitoring blades 4. The monitoring blade resistance monitoring element 44 monitors the resistance data of the cubic soil body in real time. By obtaining the one-to-one correspondence between cement content and resistance characteristics through pre-construction experiments, it can be deduced whether the cement content meets the design strength requirements. If the design requirements are not met, the amount of cement slurry is increased in this layer of soil.

[0049] It should be noted that the monitoring wing resistance monitoring element 44 should be securely fixed in the monitoring wing monitoring element fixing hole 45, and the power supply should be sufficient before each cement pile construction; when monitoring the resistance of cubic soil, the rotation speed of the drill bit should be slowed down.

[0050] Example 3

[0051] Based on the above embodiments, when inflating the airbag to accelerate the cement slurry injection, the inflation speed should be controlled to prevent excessive pressure from causing severe interference to the soil around the drill bit.

[0052] The fixed rotating shaft 93 should have a limit device, and the discharge plate 92 should always be kept at an angle of less than 60 degrees with the return plate on the same side; otherwise, the anti-backflow device 9 will fail.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mixing pile machine drill bit for improving the construction quality of a cement-soil retaining wall, characterized by: It includes drill pipe (1), the drill pipe (1) is opened several slurry holes (7) for discharging cement slurry, and is welded with drill cone (6) at the end of drill pipe (1), and is welded with two blades (2) on the left and right sides of drill pipe (1), The blade (2) is divided into upper blade and lower blade; the blade (2) is opened through bolt hole (24), and the blade (2) is divided into upper chute (22) and lower chute (21); The upper chute (22) of the upper blade (2) is fixed with monitoring wing piece (4) by bolt hole (24) using fixing bolt (23), and the lower chute (21) is fixed with cutting wing piece (5) by bolt hole (24) using fixing bolt (23); The lower chute (21) on the lower blade (2) is fixed with monitoring wing piece (4) by bolt hole (24) using fixing bolt (23), and the upper chute (22) is fixed with cutting wing piece (5) by bolt hole (24) using fixing bolt (23); The monitoring wing piece (4) is opened with monitoring wing piece bolt hole (41) in monitoring wing piece base (42), is slid into lower chute (21) and upper chute (22) through monitoring wing piece base (42), and is fixed to blade (2) using fixing bolt (23); The monitoring wing piece (4) is provided with monitoring wing piece cutting piece (43), and is also used to cut soil body, and monitoring wing piece cutting piece (43) is provided with monitoring wing piece resistance monitoring element (44) on the front face; The monitoring wing piece resistance monitoring element (44) of the monitoring wing piece (4) transmits information to ground control console through electronic signal; if the pile drilling condition is not ideal, cutting wing piece (5) is increased or reduced on the basis of the original, so that the drilling process and the stirring process are more efficient.

2. The mixing pile machine drill bit for improving the construction quality of the cement-soil retaining wall according to claim 1, characterized in that: The cutting wing piece (5) is opened with cutting wing piece bolt hole (51) in cutting wing piece base (52), is slid into lower chute (21) and upper chute (22) through cutting wing piece base (52), and is fixed to blade using fixing bolt (23).

3. The mixing pile machine drill bit for improving the construction quality of the cement-soil retaining wall according to claim 1, characterized in that: The cutting wing piece (5) is provided with cutting wing piece cutting piece (53), and the cutting wing piece cutting piece (53) has a certain inclination angle with cutting wing piece base (52).

4. The mixing pile machine drill bit for improving construction quality of a cement-soil retaining wall according to claim 1, characterized in that: The inside of drill pipe (1) is fixed with air channel (3), the air channel (3) is fixed with air bag baffle (31), the air bag baffle (31) is fixed with inflatable air bag (8) below, the air bag (8) is cylindrical after inflation, and is placed between drill pipe (1) and air channel (3).

5. The mixing pile machine drill bit for improving construction quality of a cement-soil retaining wall according to claim 1, characterized in that: The air channel (3) inside the air bag (8) is opened with symmetrical air outlet (32); the upper part of the air channel (3) is fixed with fixed rotating shaft (93), and the fixed rotating shaft (93) is connected with back slurry baffle (91) in the drill pipe (1).

6. The mixing pile machine drill bit for improving construction quality of a cement-soil retaining wall according to claim 5, characterized in that: The fixed rotating shaft (93) is fixed with rotating slurry piece (92), the slurry piece (92) rotates around the fixed rotating shaft (93) below the back slurry baffle (91), and can completely block the cavity between the back slurry baffle (91) and the fixed rotating shaft (93), so as to prevent the backflow of cement slurry.

7. The method of claim 1, wherein the method further comprises: drilling a hole in the ground; and inserting the drill bit into the hole. Specifically includes the following steps: S1, before the construction of the cement-soil mixing pile retaining wall, the stratum of the construction area should be explored in detail, and the main results of the exploration should include the properties of each soil layer in the construction area of the cement-soil mixing pile, the soil body category, the strength index, and the underground water distribution; after obtaining the exploration data of each soil layer, the cement slurry obtained at each depth of the soil body should be added on the ground to form a cuboid sample, and the resistance of the sample with different contents of the cement slurry is measured under a certain voltage to form the one-to-one correspondence experimental results of the cement content and the resistance characteristics; S2, the upper slide groove (22) of the upper blade (2) and the lower slide groove (21) of the lower blade (2) are each provided with an even number of monitoring wings (4); the lower slide groove (21) of the upper blade (2) and the upper slide groove (22) of the lower blade (2) are each provided with a plurality of cutting wings (5); the monitoring wing resistance monitoring element (44) of the monitoring wing (4) transmits information to the ground control console through an electronic signal; if the piling drilling condition is not ideal, the cutting wings (5) are increased or decreased on the basis of the original, so that the drilling process and the mixing process are more efficient; S3, the drill rod (1) is connected to the rotating shaft of the mixing pile machine, the machine is moved to the construction site for construction, the drill cone (6), the cutting wing (5) and the monitoring wing (4) efficiently cut the soil body, the drill bit moves underground, reaches the bottom elevation of the cement-soil pile, moves the drill bit upward and starts to spray the cement slurry, the cement slurry is transported from the ground to the slurry outlet hole (7) through the drill rod (1), and is thrown out to the outside of the pile body under the centrifugal action of the inclined cutting wing cutting piece (53) of the cutting wing (5) of the upper and lower blades (2), so as to take the cement slurry away from the axial region, so that the cement content of the whole cross section of the cement pile remains consistent; S4, when the soil quality of part of the depth is poor, the air pump on the ground inflates the air bag (8) through the air channel (3), the high-pressure gas enters the air bag (8) through the air outlet hole (32) on the air channel (3), the air bag (8) inflates and expands, extruding the cement slurry between the air bag (8) and the drill rod (1) to accelerate the slurry outlet hole (7) to the soil body, thereby increasing the cement content in the soil body region under the condition that the piling speed remains unchanged; S5, the air bag baffle (31) is fixed on the upper part of the air channel (3) and the air bag (8), which prevents the air bag (8) from blocking the slurry discharge pipeline after inflation; and the slurry outlet piece (92) is fixed above the air bag baffle (31), the slurry outlet piece (92) can only rotate to the west side due to the blockage of the backflow baffle (91); when the cement slurry flows from the ground to the drill bit, the slurry outlet piece (92) opens under the impact force to ensure the normal transportation of the cement slurry, and if the cement slurry is not easily sprayed to the soil body due to excessive pressure, the slurry outlet piece (92) automatically closes under the pressure of the downside to prevent the cement slurry from flowing back to the ground. S6. During the rotation of the drill bit, there will always be a cubic soil body between the two monitoring blades (4). The monitoring blade resistance monitoring element (44) monitors the resistance data of the cubic soil body in real time. Thus, by obtaining the one-to-one correspondence between the cement content and resistance characteristics through the pre-construction experiment, it can be deduced whether the cement content meets the design strength requirements. If the design requirements are not met, the amount of cement slurry is increased in this layer of soil.

8. The construction method of the mixing pile machine drill bit for improving the construction quality of the cement-soil retaining wall according to claim 7, characterized in that: The monitoring element (44) for monitoring the resistance of the wing should be securely fixed in the monitoring element fixing hole (45), and the power supply should be sufficient before each cement pile construction. When monitoring the resistance of the cubic soil, the rotation speed of the drill bit should be slowed down.

9. The method of claim 7, wherein the method further comprises: rotating the drill bit at a speed of 300 rpm to 500 rpm. When inflating the airbag to accelerate the injection of cement slurry, the inflation speed should be controlled to prevent the pressure from being too high and causing severe interference to the soil around the drill bit. The fixed rotating shaft (93) should have a limit device, and the slurry outlet plate (92) should always be kept at an angle of less than (60) degrees with the slurry return baffle on the same side. Otherwise, the anti-backflow device (9) will fail.

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