CN115739961A - Even-number-axis liquid-adding powder-spraying stirring device and soil remediation method - Google Patents

Abstract

The invention provides an even-number-axis liquid and powder adding and spraying stirring device and a soil remediation method. Further, since the drill bit parts are provided in even numbers and are symmetrically arranged at the bottom of the pile driving frame, the rotation speeds are the same, the diameters are equal, and the rotation directions are opposite, the acting force and the reaction force of the two adjacent shafts can be mutually offset during operation, so that the whole device has excellent operation stability.

Description

Even-number-axis liquid-adding powder-spraying stirring device and soil remediation method

Technical Field

The invention relates to a stirring device, in particular to an even-number-axis liquid and powder adding stirring device and a soil remediation method.

Background

In-situ solidification/stabilization is a mature waste disposal technology, and has been successfully applied to harmless and recycling of polluted soil, radioactive waste, bottom mud and industrial sludge after decades of research. Compared with other technologies, the technology has obvious repairing effect on most inorganic pollutants and some organic pollutants, has obvious advantages in repairing intractable and mixed polluted sites, and is short in treatment time, wide in application range, and simple and easily available in devices and materials.

The form of the in situ curing/stabilizing equipment varies, and the contaminant characteristics and field conditions affect the selection of the type of curing/stabilizing equipment, such as the depth and geometry of the target contaminated medium, underground debris, tight earth formations, buildings, railways, utilities and other structures, surface waters, and the like. The effect of various parameters of the repairing equipment is obviously influenced, and the parameters mainly comprise effective action depth, stirring speed, medicament diffusion efficiency, treatment speed, stirring time and the like.

In the prior art, the in-situ curing/stabilizing apparatus mainly comprises: high speed rotation stabilization equipment, high pressure rotary spraying equipment, rotary stirring machine, excavator bucket, hollow fork injection equipment and the like.

The high speed rotational stabilization device is capable of mixing the solidification/stabilization agent with the soil or sludge by the rotational action of the agitator head equipped with blades or teeth. The device is suitable for treating soil and sludge with high solid content, and can perform mixing and stirring of target media in an in-situ target area. The use process of the device comprises the following steps: excavating soil at the early stage, layering, conditioning, curing and stabilizing. The curing/stabilizing agent can be fed directly around the stirring head by pneumatic or hydraulic pressure, and the mixing operation is directly performed. Besides the mixing and stirring system, the in-situ solidification/stabilization equipment needs to be provided with a set of grouting device which mainly comprises a storage silo, a metering meter, mixing equipment and a pump.

The high-pressure rotary spraying device can inject the medicament into a target medium through a special rotary drill rod by means of high pressure (40 MPa), the equipment is particularly suitable for an in-situ curing/stabilizing treatment process with a large depth, the treatment depth can reach 30m, and the effective diameter is 0.6-1.8 m. The water-to-solid ratio, binder and filler composition, and cement slurry amount in the grout affect the ultimate strength of the treated soil column and the permeability of contaminants. The rotary jet grouting is very suitable for solidification and stabilization of isolated media or polluted soil and solidification and stabilization processes of target media under permanent buildings. The high-speed grouting device is an improved double-liquid jet grouting system, and the device can enlarge the influence radius (3-5 m) of jet grouting. This device enables the injection of a cement slurry into the target medium through a horizontal nozzle, at a very high injection speed, of about 200m/s. At such high energy injection speeds, the structure of the target medium is disturbed, thereby achieving efficient mixing of the agent and the target medium.

However, the rotary jet drilling machine applied to soil remediation in the above devices adopts a single drill bit to drill, stir and inject the medicament, the drill bit is small in size, the remediation radius is limited, and the rotary drilling and the continuous deep operation of the drill bit are not facilitated. The high-pressure rotary spraying equipment has slightly poor rotary spraying quality for humus soil with large gravel diameter, excessive gravel content and large amount of fibers, and sometimes even has inferior effect as static pressure grouting.

In some construction areas, soil is dry due to the fact that the underground water level is low, and therefore the powdery soil remediation agent cannot diffuse in the soil to affect the remediation effect. In addition, working on dry soil can increase wear of the drill bit.

Disclosure of Invention

The present invention has been made to solve the above problems, and an object of the present invention is to provide an even-numbered axial liquid-adding, powder-spraying, stirring apparatus and a soil remediation method, which are efficient and safe and can uniformly mix contaminated soil and a chemical.

The invention provides an even-number shaft liquid-adding, powder-spraying and stirring device, which is used for injecting a powdery soil remediation agent into deep soil so as to realize in-situ remediation of the deep soil, and comprises: a pile driving frame; the drill bit parts are symmetrically arranged at the bottom of the pile driving frame, and each drill bit part comprises at least three stages of stirring blade groups; the conveying part comprises a first conveying channel and a second conveying channel which is arranged in the first conveying channel in a penetrating mode; the liquid spraying part comprises a liquid spraying nozzle and a liquid spraying pipe, one end of the liquid spraying pipe passes through the first conveying channel and is communicated with the second conveying channel, the other end of the liquid spraying pipe is positioned on the outer side of the first conveying channel, the liquid spraying nozzle is installed at the other end of the liquid spraying pipe, and the powder spraying part comprises a powder spraying nozzle and a powder spraying pipe communicated with the powder spraying nozzle and the first conveying channel; wherein the liquid spraying nozzle is used for spraying liquid to dissolve the powdery soil remediation agent sprayed by the powder spraying nozzle.

The even-number shaft liquid and powder adding and spraying stirring device provided by the invention can also have the following characteristics: wherein each drill bit portion further comprises: the drill rod is hollow, one end of the drill rod is arranged at the bottom of the pile driving frame, and the other end of the drill rod extends in the direction far away from the pile driving frame; and the power head is arranged at one end of the drill rod far away from the pile driving frame.

The even-number shaft liquid and powder adding and spraying stirring device provided by the invention can also have the following characteristics: wherein, every grade stirring blade group includes: a plurality of stirring blades arranged on the outer surface of the drill rod in sequence along the length direction of the drill rod.

The even-number shaft liquid and powder adding and spraying stirring device provided by the invention can also have the following characteristics: wherein, each stirring blade group comprises at least one stirring blade with drill teeth.

The even-number shaft liquid and powder adding and spraying stirring device provided by the invention can also have the following characteristics: wherein, along the length direction of drilling rod, from the one end that is close to pile driver's frame to the one end of keeping away from pile driver's frame, stirring vane's among the stirring vane group stirring diameter reduces in proper order.

The even-number shaft liquid and powder adding and spraying stirring device provided by the invention can also have the following characteristics: wherein, the plane of stirring vane place and the axis of drilling rod's contained angle is alpha, and alpha ≠ 0 or 90.

The even-number shaft liquid and powder adding and spraying stirring device provided by the invention can also have the following characteristics: wherein, the conveying part still includes: the conveying pipe is arranged in the drill rod and extends along the length direction of the drill rod, a second conveying channel is formed in the conveying pipe, and a first conveying channel is formed between the outer wall of the conveying pipe and the inner wall of the drill rod; the air compressor is used for conveying the powdery soil remediation agent to the first conveying channel; and a high pressure pump for delivering liquid to the second delivery passage.

The even-shaft liquid and powder adding and stirring device provided by the invention can also have the following characteristics: wherein, the drill bit portion still includes: and the hoop is sleeved on the drill rod and used for guiding the drill rod.

The even-number shaft liquid and powder adding and spraying stirring device provided by the invention can also have the following characteristics: wherein, even number bores head and takes the form of square or a style of calligraphy distribution.

A soil remediation method is implemented by an even-number shaft liquid-adding powder-spraying stirring device with an even-number of drilling head parts, a conveying part, a liquid-spraying part and a powder-spraying part, and comprises the following steps: step 1, drilling a target area through a drill head part, so that a plurality of drill holes are formed in the target area; step 2, the drill bit part stirs the soil in the drill hole; and 3, while the drill bit part keeps stirring, the liquid spraying part sprays liquid to the stirred soil, and the powder spraying part sprays powdery soil remediation agent to the stirred soil.

Action and Effect of the invention

According to the even axial liquid and powder adding stirring device, the conveying part is provided with the first conveying channel and the second conveying channel, the powder spraying nozzle of the powder spraying part is communicated with the first conveying channel through the powder spraying pipe, and the liquid spraying nozzle of the liquid spraying part is communicated with the second conveying channel through the liquid spraying pipe penetrating through the first conveying channel, so that when the even axial liquid and powder adding stirring device works, a powdery soil repairing agent sprayed by the powder spraying nozzle is dissolved through a solution sprayed by the liquid spraying nozzle, a chemical reaction is generated, soil is softened, and deep soil is repaired in situ.

Further, because the even number of drill bit parts are arranged at the bottom of the pile driving frame symmetrically, the rotating speeds of the drill bit parts are the same, the diameters of the drill bit parts are the same, and the rotating directions of the drill bit parts are opposite during working, the acting forces of two adjacent shafts of the even number shaft liquid and powder adding stirring device can mutually offset the reaction force during working, so that the whole device has excellent working stability.

Drawings

FIG. 1 is a flow chart of a soil remediation method according to an embodiment of the invention;

FIG. 2 is a schematic structural diagram of an even-numbered axis liquid and powder adding and spraying stirring device in an embodiment of the invention;

FIG. 3 is a perspective sectional view of a drill bit portion in an embodiment of the present invention;

FIG. 4 is a schematic diagram of a powerhead in an embodiment of the present invention;

FIG. 5 is a schematic view of another bit section arrangement; and

fig. 6 is a schematic view of a liquid spray tube in an embodiment of the invention.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is specifically described below by combining the embodiment and the attached drawings.

< example >

The embodiment provides a soil remediation method which is realized by an even-number axial liquid-adding powder-spraying stirring device with an even-number of drilling head parts, a conveying part, a liquid-spraying part and a powder-spraying part. However, in other embodiments, the even-numbered axis powder feeding and spraying stirring device as in this embodiment is not essential, and other devices may be used.

FIG. 1 is a flow chart of a soil remediation method according to an embodiment of the invention.

As shown in fig. 1, specifically, the method comprises the following steps: firstly, drilling a target area through a drill bit part, so that a plurality of drill holes are formed in the target area; then the drill bit part stirs the soil in the drill hole; and finally, while the drill bit part keeps stirring, the liquid spraying part sprays liquid to the stirred soil, and the powder spraying part sprays powdery soil remediation agent to the stirred soil. The spraying part is used for dissolving the powdery soil remediation agent sprayed by the spraying part, stopping spraying the wet soil and spraying the dry soil, so that the soil remediation agent is fully mixed with the soil. Therefore, the above repairing method can avoid the ground preparation and pumping of toxic, harmful, strong oxidizing and strong corrosive medicines. In addition, the construction can be smoothly carried out in areas with lower underground water level and less soil water content in time.

The even-numbered axis liquid adding, powder spraying and stirring device used in the soil remediation method of the embodiment is described below.

Fig. 2 is a schematic structural diagram of an even-numbered axis liquid and powder injection stirring device in an embodiment of the invention, fig. 3 is a perspective sectional view of a drill bit part in an embodiment of the invention, fig. 4 is a schematic diagram of a power head in an embodiment of the invention, fig. 5 is a schematic diagram of another drill bit part distribution, and fig. 6 is a schematic diagram of a liquid injection tube in an embodiment of the invention.

As shown in fig. 2 to fig. 6, the even-numbered axis liquid and powder adding and stirring device 100 provided in this embodiment includes: the pile driving stand 10, the drill part 20, the conveying part 30, the two powder spraying parts 40, and the two liquid spraying parts 50.

The pile driving stand 10 is fixedly arranged in an area needing soil in-situ remediation. In the embodiment, the piling frame is a general long spiral piling frame, a BL-32 type piling frame, the height of the piling frame is 39m, the width of the piling frame is 8m, the length of the piling frame is 13m, and the piling frame can bear the maximum torque of 250 kilo Nm.

The number of the drill heads 20 is 2, and the drill heads are symmetrically arranged at two ends of the pile driving frame 10 and are arranged in a straight line. In the present embodiment, the two bit portions 20 have the same structure. In another embodiment, the number of the drill heads 20 may be 2n (n is an integer greater than or equal to 1), and 2n drill heads 20 may be symmetrically installed at two ends of the pile driving frame 10, each end being n, like the present embodiment.

As shown in fig. 6, the number of drill bit portions 20 may be 2n +2m (n, m are each an integer equal to or greater than 1), and they are distributed in a square shape. Specifically, 2n +2m drill bit portions 20 are distributed on a virtual quadrangle S at the bottom of the pile driving stand 10, and a total of 2n drill bit portions 20 are arranged on one pair of oppositely arranged sides of the virtual quadrangle S, wherein each side is n; a total of 2m drill heads 20 are provided on the other pair of oppositely disposed sides, m on each side. Preferably, in this embodiment, the centre point of the virtual quadrilateral S coincides with the centre point of the bottom face of the pile driving mast 10. Here, the virtual quadrangle S is only a concept defined for convenience of description and does not need to be actually present at the bottom of the pile driver 10.

Each bit portion 20 includes: drill rod 21, stirring blade 22, drill teeth 23, power head 24 and anchor ear 25.

The drill rod 21 is a hollow round drill rod and is arranged at the bottom of the pile driving frame 10, and the drill rod 21 vertically extends downwards. In the present embodiment, the drill rod 21 is

The universal round drill rod has the wall thickness of 20mm and the structural strength of 900 MPa.

The stirring vanes 22 comprise three stages of stirring vanes, the number of each stage of stirring vanes is two, the structures of the three stages of stirring vanes are basically the same, all the stirring vanes 22 are in a plate shape, the difference is only that the stirring radius of each stage of vanes is different, and the stirring diameter of the stirring vanes 22 is reduced in sequence from one end close to the pile driving frame 10 to one end far away from the pile driving frame 10 along the length direction of the drill rod 21. In this embodiment, the outer diameter of the first stage mixing blade is 400mm, the outer diameter of the second stage blade is 1200mm, and the outer diameter of the third stage blade is 2000mm.

The three-stage stirring blades 22 are sequentially arranged on the peripheral wall of the drill rod 21 along the length direction of the drill rod 21, the stirring blades 22 in the same stage are arranged on the peripheral wall of the drill rod 21 in the same posture, and the plane where the stirring blades 22 are located and the axis of the drill rod 21 form a non-right-angle included angle.

The drill teeth 23 are arranged at the end of the part of the mixing blade 22 remote from the drill rod 21 and with their tips directed obliquely downwards. In the present embodiment, only two of the four stirring blades 22 of each stage are provided at the ends with three mutually parallel drilling teeth 23. Two stirring blades 22 with drilling teeth 23 are arranged axisymmetrically with respect to the axis of rotation of the drill rod 21. This arrangement ensures that the force remains uniform during operation of the drill head 20 and thus ensures safety of the overall apparatus.

The power head 24 is mounted at the end of the drill rod 21 remote from the rig 10. In the embodiment, the power head 24 is a universal long-spiral piling power head with 150KW power, is driven by two 75KW alternating-current motors in parallel, can generate 150 kilo-newton-meters of maximum torque and 14r/min of rotation speed, and can be also provided with a high-pressure stirring and spraying liquid splitter in the middle of a core pipe.

The anchor ear 25 is sleeved at one end of each drill rod 21 close to the pile driving stand 10. The hoop 25 includes two semicircular hoop frames and semicircular tendon bushes respectively embedded inside the two semicircular hoop frames. The anchor ear 25 is used to embrace the drill rod and allow the drill rod 21 to rotate in the anchor ear and slide up and down to guide the drill rod and maintain the verticality of the drilled hole.

In the present embodiment, the drill portion 20 is of an agitating blade type, but in other embodiments, the drill portion 20 may be of a double helix shape.

The delivery section 30 includes a delivery pipe 31, a second delivery passage 32, a first delivery passage 33, a high-pressure pump (not shown in the figure), and an air compressor (not shown in the figure).

The conveying pipe 31 is disposed inside the drill rod 21 and extends in a length direction of the drill rod 21. In this embodiment, the delivery pipe 31 is a hollow pipe, and a second delivery passage 32 for delivering water, hydrogen peroxide solution, or other chemical solution meeting the use standard is formed inside the delivery pipe.

The high-pressure pump is used for delivering water, hydrogen peroxide or other medicine solution meeting the use standard into the second delivery pipeline 32. Specifically, in the present embodiment, a 3e160 type high pressure jet pump is selected, the motor power is 110KW, the maximum pump capacity can reach 300L/min, and the maximum pump pressure can reach 20MPa.

A first transfer passage 33 is formed between the outer wall of the transfer pipe 31 and the inner wall of the drill rod 21 for transferring the powdery soil remediation agent.

The air compressor is used for conveying the liquid soil remediation agent into the first conveying pipeline 33, and specifically, a screw type general process air compressor is selected in the embodiment, the output air pressure is 1.2MPa, and the gas production is 9m ³ Min, and the motor power is 75KW.

In this embodiment, the second delivery channel 32 communicates with a high pressure pump for delivering water. The first conveying channel 33 is communicated with an air compressor and is used for conveying the powdery soil remediation agent. However, in other embodiments, the second transport conduit 32 may also be used to transport soil remediation agents, and the first transport conduit 33 may also be used to transport water.

Two portions of dusting 40 are installed respectively on the drill bit portion 20 that corresponds, all include three nest of tubes and a plurality of shower nozzle of dusting, and the nest of tubes length of dusting of three nest of tubes of dusting is different, and three nest of tubes of dusting sets gradually from top to bottom along the length of the pipe of dusting by from long to short for it is more even to spray powder.

Specifically, the powder spraying pipe is arranged perpendicular to the drill rod 21 and is located on the back side of the stirring blade 22, and one end of the powder spraying pipe is communicated with the first conveying channel 33. The other end is provided with a powder spraying nozzle. In the present embodiment, the powder injection pipe is welded to the side of the drill rod 21, but may be detachably mounted on the drill rod 21 by means of a bolt connection. Here, how the powder injection pipe is fixedly connected to the drill rod 21 will not be described.

The two liquid spraying portions 50 are respectively installed on the corresponding drill head portion 20, and each liquid spraying portion includes three shunting seats 51, three liquid spraying tube groups 52 and a plurality of liquid spraying nozzles (not shown), each liquid spraying tube group 52 has two liquid spraying tubes with equal length, the liquid spraying tubes of the three liquid spraying tube groups 52 are different in length, and the three liquid spraying tube groups are sequentially arranged from top to bottom along the length of the powder spraying tube from long to short.

Reposition of redundant personnel seat 51 has the mounting hole and perpendicular just communicate reposition of redundant personnel passageway with the mounting hole, sets up the export that three groups established the setting relatively on conveyer pipe 31, and reposition of redundant personnel seat 51 establishes on the conveyer pipe through the mounting hole cover for export and reposition of redundant personnel passageway on the conveyer pipe 31 are linked together.

The spray pipe is perpendicular to the delivery pipe 31, i.e. one end of the spray pipe passes through the first delivery pipe 33 and communicates with the second delivery pipe 32 through a diversion channel, and the other end passes through the drill rod 21.

The liquid ejection heads are respectively installed at the other ends of the liquid ejection tubes 52. It should be noted that the water sprayed from the spray nozzle is uniformly mixed into the soil, and then further stirred by the stirring blade, so that the medicament is fully contacted with the pollutants, and the best effect is achieved.

In this embodiment, the middle section of the liquid ejecting tube 52 is a liquid feeding section 52a, the other end of the liquid ejecting tube 52 is a mounting section 52b, the inner diameter of the liquid feeding section 52a is larger than that of the mounting section 52b, and the liquid ejecting head is mounted on the mounting section 52b of the liquid ejecting tube 52.

In this embodiment, the liquid spraying pipe 52 of the liquid spraying part 50 and the powder spraying pipe of the powder spraying part 40 are arranged side by side, so that the powder spraying pipe is led out from the drill stem 21, the liquid spraying pipe 52 is led out from the conveying pipe 31, and the powder spraying pipe and the liquid spraying pipe 52 are both located behind the stirring blade 22.

The liquid spraying part 50 is used for dissolving the powdery soil remediation agent sprayed by the powder spraying part 40, and the water spraying can be stopped for moist soil, and the water spraying can be performed for dry soil, so that the soil remediation agent and the soil are fully mixed.

Effects and effects of the embodiments

According to the even axle liquid feeding agitating unit that this embodiment relates to, because the transport part has first transfer passage and second transfer passage, the spray nozzle of spray part passes through the spray pipe and communicates with first transfer passage, the hydrojet nozzle of hydrojet part passes through the spray tube of first transfer passage and communicates with second transfer passage, so, even axle liquid feeding agitating unit during operation, the likepowder soil remediation agent of spray nozzle spun dissolves through hydrojet nozzle spun water, and then softens soil to carry out the normal position to deep soil and restore.

Further, because the even number of the drill bit parts are symmetrically arranged at the bottom of the pile driving frame and the rotation directions of the drill bit parts are opposite during operation, the even number of the liquid and powder adding and stirring devices of the embodiment can counteract the reaction force during operation, so that the whole device has excellent operation stability.

Furthermore, as the stirring blades and the drill teeth are arranged on the drill rod, the device has a larger repairing radius, can crush the soil to the maximum extent, and greatly improves the mixing degree of the repairing agent and the soil.

Furthermore, as the stirring blades are obliquely arranged on the drill rod, the cutting and stirring acting force of the drill bit on the soil body is improved, the problem of sundry winding is solved, and the rotary drilling and the continuous deep operation of the drill bit are facilitated.

Furthermore, as the distance between the powder spraying nozzle and the axis of the liquid spraying nozzle and the axis of the drill rod is the same, the powdery soil repairing agent sprayed by the powder spraying nozzle can be better dissolved in water sprayed by the liquid spraying nozzle.

Furthermore, because the liquid spray pipe and the powder spray pipe are arranged oppositely, the rotational inertia of the rotating rod can be reduced, and the whole device has excellent working stability.

Furtherly, because spray pipe and powder pipe all are located stirring vane's rear end, consequently, at the in-process of whole device work, stirring vane contacts with soil earlier, and then crowds other positions with soil to prevent that the spray pipe from contacting the aggravation wearing and tearing with soil at the pivoted in-process.

Further, because the inner pipe diameter of the powder conveying section of the powder spraying pipe is larger than that of the installation section, the internal pressure can be kept constant.

The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.

In the above embodiment, the number of the stirring blades in each stage is two, but in other embodiments, the number of the stirring blades may be four, and the four stirring blades are distributed around the drill rod ring, so as to form 4 a areas, but not all the a areas, and the liquid spraying pipes are formed on the two a areas which are oppositely arranged in only 2 stages, so that the stirring blades are firstly contacted with the muddy water, and the liquid spraying pipes are prevented from being worn out in the rotating process.

As can be seen from the above description, a total of 6 drill rod mounting holes are distributed on the drill rod, and all the drill rod mounting holes are formed on two lines parallel to the axis of the drill rod 21. Such an arrangement may result in more even spraying.

In addition, the middle section of the liquid spraying pipe is a water conveying section, the other end of the liquid spraying pipe is an installation section, the inner diameter of the water conveying section is larger than that of the installation section, and the liquid spraying nozzle is installed on the installation section of the liquid spraying pipe.

Claims (10)

1. The utility model provides an even number axle liquid feeding agitating unit that dusts for pour into likepowder soil remediation agent into deep soil, thereby the realization is right deep soil normal position is restoreed, its characterized in that includes:

a pile driving frame;

the drill bit parts are symmetrically arranged at the bottom of the pile driving frame, and each drill bit part comprises at least three stages of stirring blade groups;

the conveying part comprises a first conveying channel and a second conveying channel which is arranged in the first conveying channel in a penetrating mode;

the liquid spraying part, the liquid spraying nozzle and the liquid spraying pipe, one end of the liquid spraying pipe penetrates through the first conveying channel to be communicated with the second conveying channel, the other end of the liquid spraying pipe is positioned outside the first conveying channel, the liquid spraying nozzle is installed at the other end of the liquid spraying pipe,

the powder spraying part comprises a powder spraying nozzle and a powder spraying pipe which is communicated with the powder spraying nozzle and the first conveying channel;

the liquid spraying nozzle is used for spraying liquid to dissolve the powdery soil remediation agent sprayed by the powder spraying nozzle.

2. The even-shaft liquid and powder adding stirring device according to claim 1, which is characterized in that:

wherein each of the bit portions further comprises:

the drill rod is hollow, one end of the drill rod is arranged at the bottom of the pile driving frame, and the other end of the drill rod extends in the direction far away from the pile driving frame; and

and the power head is arranged at one end of the drill rod, which is far away from the pile driving frame.

3. The even-shaft liquid and powder adding stirring device according to claim 2, which is characterized in that:

wherein each stage of the stirring blade group includes: and the stirring blades are sequentially arranged on the outer surface of the drill rod along the length direction of the drill rod.

4. The even-number shaft liquid and powder adding stirring device according to claim 3, which is characterized in that:

wherein, each stage of the stirring blade group comprises at least one stirring blade with drill teeth.

5. The even-number shaft liquid and powder adding stirring device according to claim 3, which is characterized in that:

and the stirring diameters of the stirring blades in the stirring blade group are sequentially reduced from one end close to the pile driving frame to one end far away from the pile driving frame along the length direction of the drill rod.

6. The even-numbered shaft liquid-adding powder-spraying stirring device as claimed in claim 3,

wherein, the plane that stirring vane place and the axis of drilling rod's contained angle is alpha, alpha ≠ 0 or 90.

7. The even-numbered shaft liquid-adding powder-spraying stirring device as claimed in claim 2,

wherein the conveying part further comprises:

the conveying pipe is arranged inside the drill rod and extends along the length direction of the drill rod, the second conveying channel is formed inside the conveying pipe, and the first conveying channel is formed between the outer wall of the conveying pipe and the inner wall of the drill rod;

the air compressor is used for conveying the powdery soil remediation agent to the first conveying channel; and

and the high-pressure pump is used for conveying liquid to the second conveying channel.

8. The even-shaft liquid and powder adding stirring device according to claim 2, which is characterized in that:

wherein, the drill bit portion still includes:

and the hoop is sleeved on the drill rod and used for guiding and correcting the drill rod.

9. The even-number shaft liquid and powder adding stirring device according to claim 1, which is characterized in that:

wherein, even number of drill bit portion is the square or a style of calligraphy distribution.

10. A soil remediation method is characterized in that remediation is performed through an even-number shaft liquid-adding powder-spraying stirring device with an even-number of drilling head parts, a conveying part, a liquid-spraying part and a powder-spraying part, and the method comprises the following steps:

step 1, drilling a target area through the drill head part, so that a plurality of drill holes are formed in the target area;

step 2, the drill bit part stirs the soil in the drill hole;

step 3, while the drill bit part keeps stirring, the liquid spraying part sprays liquid to the stirred soil, the powder spraying part sprays powdery soil remediation agent to the stirred soil,

the even-number shaft liquid-adding powder-spraying stirring device is the even-number shaft liquid-adding powder-spraying stirring device according to any one of claims 1 to 9.

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