CN117501882A - Construction equipment and operation method for microorganism mineralization barrier layer in deep saline soil - Google Patents

Abstract

The invention discloses construction equipment and an operation method for a microorganism mineralization barrier layer in deep saline soil, wherein the construction equipment comprises a plow frame, a sowing machine, a grouting system and a grouting tool bit, the upper part of the plow frame is positioned on the ground, the lower part of the plow frame is positioned in soil, the sowing machine is arranged in the middle of the plow frame, the bottom of the sowing machine is positioned on the surface layer of the soil, the grouting tool bit is positioned at the tail part of the plow frame and is positioned in the deep layer of the soil, the horizontal height of the grouting tool bit is lower than that of the sowing machine, the grouting system comprises a grouting tank, a grouting pipe and a spray pipe, the grouting tank is arranged on the plow frame, the spray pipe is arranged in the grouting tool bit, and the spray pipe is connected with the grouting tank through the grouting pipe. The invention realizes the operation construction of microbial grouting without excavation by utilizing the agricultural machinery matched with the grouting system and the grouting tool bit, forms a uniform, continuous and complete mineralized barrier layer after grouting, is suitable for the operation of large-area salinized soil barrier layer, and has high operation efficiency and good barrier layer forming quality.

Description

Construction equipment and operation method for microorganism mineralization barrier layer in deep saline soil

Technical Field

The invention relates to the technical fields of rock soil and environmental engineering and microbial mineralization, in particular to equipment for constructing a microbial mineralization barrier layer in deep saline soil and an operation method.

Background

The saline-alkali soil desalination can be realized by arranging the salt barrier layer, and the principle is that materials such as furnace slag, crushed stone chips, sawdust, straw, sand stone, geotechnical materials, asphalt sand, peat, zeolite, ceramsite, vermiculite and the like are paved underground, so that soil capillary tubes can be cut off, the saline-alkali soil is prevented from going upwards, salt surface aggregation is reduced, and the soil on the surface layer keeps lower salt. The method can ensure that after rainfall and irrigation, soil salinity above the barrier layer is leached to deep soil along with moisture, and in the evaporation process, the evaporation of the salinity in groundwater and the deep soil to the upper soil is delayed or prevented, so that the soil salinity in a root zone is reduced, and the normal growth of crops and plants is ensured. The barrier layer material used in the technology is mainly crop straw sand stone filler and the like, but biological organic matters such as straw and the like are easy to cause seedling burning or contend with crops to cause crop nutrition deficiency if the biological organic matters are directly used without fermentation, thereby influencing the growth of the crops. And the soil layer above the barrier layer is required to be dug out during construction, then the laying operation of the barrier layer is carried out, the upper soil layer is backfilled after the laying of the barrier layer is finished, the construction process is time-consuming and labor-consuming, and the cost of the manual machine is low although the raw materials are quite economical, so that the construction method is not suitable for large-area popularization.

In recent years, a technology for forming a barrier layer through mineralization of microorganisms has been developed, and the principle of the technology is that corresponding bacterial metabolites in the nature are combined with free metal cations in the nature to generate gel crystals, the gel crystals are mineralized to form the barrier layer, water salt migration is blocked, and shallow low-salinity soil beneficial to plant growth is formed on the surface layer of soil. The microbial species disclosed in paper "a high efficiency strain screened from soil and applied to fine sand consolidation based on MICP binding technology" (A highly effective strain screened from soil and applied in cementing fine sand based on MICP-bonding technology) (journal of biotechnology, 2022, month 5, 20, pages 55-66) can be used to form the barrier layer. However, the construction method for forming the microbial mineralization barrier layer still has the defects of construction that the soil layer is lifted firstly, microbial slurry is sprayed, then earth is covered for backfilling, and the construction is still relatively defective. The salinized soil is mostly powdery clay, the permeability is extremely poor, slurry is difficult to infiltrate to a certain depth, and the strength and permeability requirements of a solidified layer are not met. Thus, a device as disclosed in WO2021027463A1 has emerged, which can be used for applying material deep into a soil layer. However, the single grouting range of the device is small, the operation is performed in a close-packed mode or performed by manually grouting one by one, the operation difficulty is high, the operation is complex, and various requirements of the barrier layer cannot be met. The invention provides a construction device and an operation method for a microorganism mineralization barrier layer in deep saline soil, which solve the problems.

Disclosure of Invention

The invention provides a device and a method for constructing a microorganism mineralized barrier layer in deep saline soil, which form a uniform, continuous and complete mineralized barrier layer through rapid operation, and have high operation efficiency and good barrier layer forming quality.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the utility model provides a microorganism mineralization barrier layer construction equipment in deep saline soil, includes plow frame, seeder, slip casting system and slip casting tool bit, the upper portion of plow frame is located subaerial, and the lower part is arranged in the soil body, the seeder is established at the middle part of plow frame, and its bottom is located the soil body top layer, the slip casting tool bit is located the afterbody of plow frame, is located the soil body deep, the level of slip casting tool bit is less than the level of seeder, slip casting system includes thick liquid jar, slip casting pipe and spray tube, the thick liquid jar is established on the plow frame, the spray tube is established in the slip casting tool bit, the spray tube passes through the slip casting pipe and is connected with thick liquid jar.

Further, the grouting tool bit comprises a connecting frame and a tool bit, the tool bit is fixedly connected to the plow frame through the connecting frame, a grouting cavity is formed in the tool bit, the grouting cavity is formed in the rear side of the tool bit, an opening is towards the rear, and the spray pipe is located in the grouting cavity.

Further, the slurry tank comprises a tank body, a pressurizer and a pressure gauge, wherein the tank body is arranged on the plow frame, the pressurizer and the pressure gauge are connected to the top of the tank body, and the grouting pipe is connected to the bottom of the tank body.

Further, the spray pipes are arranged in the grouting cavity in parallel, spray holes are arranged on the spray pipes, and the spray holes are arranged at intervals on the rear side of the spray pipes and face the opening direction of the grouting cavity; and a valve is arranged on the grouting pipe.

Further, the seeder comprises a mounting frame, a seed and fertilizer box and a furrow opener, wherein the seed and fertilizer box is arranged on the mounting frame, and the furrow opener is arranged below the seed and fertilizer box; the mounting frame comprises an adjusting vertical frame and a horizontal frame seat, the adjusting vertical frames are arranged on the plow frame in pairs, the horizontal frame seat is arranged between the adjusting vertical frames, and the seed fertilizer box is arranged in the horizontal frame seat.

Further, adjusting holes are formed in the adjusting vertical frames at intervals, bolts are arranged in the adjusting holes, the adjusting vertical frames are connected to the plow frame through bolts, and the horizontal frame seat is connected to the adjusting vertical frames through bolts.

Further, the plow frame includes butt joint frame, inclined frame and rack, the butt joint frame is connected with the tractor, the inclined frame passes through bolted connection on the butt joint frame, the seeder is established at the inclined frame middle part, grouting tool bit is established at the inclined frame tail portion, the rack is erect between the inclined frame, the thick liquid jar is established in the rack.

Further, the inclined frame is arranged in a downward inclined mode, a through groove is formed in the inclined frame, and the grouting pipe is arranged in the through groove.

Further, the cross section of tool bit is the triangle, the cross section of slip casting chamber is V type structure.

An operation method of microorganism mineralization barrier layer construction equipment in deep saline soil comprises the following steps,

s1, leveling a land to be subjected to mineralized barrier layer construction;

s2, connecting the equipment with a tractor, adjusting the installation height and angle of a grouting tool bit, starting the tractor to carry out debugging operation in front of the tractor, and pressing the grouting tool bit into soil and reaching the depth of 20-40 cm;

s3, closing the tractor, and injecting bacterial liquid and cementing liquid into the grouting system;

s4, starting the tractor, pressurizing the grouting system, enabling the pressure value to be 0.5-0.8MPa, enabling the tractor to move forwards, opening a valve on the grouting system, and grouting a mineralized barrier layer at the bottom layer along with the front of the tractor;

s5, after the grouting of the mineralized barrier layer at the bottom layer is finished, the height of a grouting tool bit is upwards adjusted by 3-5cm, the front row of the tractor is started to carry out debugging operation, the grouting tool bit is pressed into soil so that the height of the grouting tool bit is 3-5cm higher than the mineralized barrier layer at the bottom layer, and then the grouting operation of the mineralized barrier layer at the surface layer is carried out according to the operation of S3-S4;

s6, grouting the mineralized barrier layer of the 1-2 subsurface layers according to the different soil quality and components of the soil body and the operation of S5, and finally forming the mineralized barrier layer with the thickness of 10-15 cm;

s7, after the mineralized barrier layer grouting is completed, placing seeds and fertilizer in a seeder, adjusting the height of the seeder, starting the front row of the tractor to carry out debugging operation, pressing the seeder into the soil body by 1-2cm, and carrying out sowing operation in front of the tractor;

and S8, after all the operations are completed, sampling is carried out to verify the mineralization performance of the barrier layer.

The invention has the following beneficial effects:

the agricultural machinery equipment is matched with the grouting system and the grouting tool bit to carry out cooperative operation, so that the operation construction of microbial grouting without excavation is realized, the operation difficulty and the tedious degree are reduced, and the operation efficiency is improved;

microorganism grouting operation is directly carried out underground through a grouting tool bit penetrating into the underground, and a uniform, continuous and complete mineralized barrier layer is formed by matching with control of a grouting system and travelling parameters, so that the method is suitable for operation of large-area salinized soil barrier layers;

the grouting tool bit can penetrate into different depths of the ground as required, and can perform barrier layer operation at different depths, so that the problem of poor slurry permeability is solved, and the formed mineralized barrier layer has the thickness meeting the requirements, good integrity and uniformity;

the combined seeder realizes that saline and raw pasture plants can be sowed on the surface layer of the soil body while forming the barrier layer, realizes that the underground barrier layer and the overground plants are sowed simultaneously, reduces the operation procedure and reduces the influence on the soil body.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a side view of the overall structure of the present invention;

FIG. 3 is a schematic view of the plow frame structure of the present invention;

FIG. 4 is a schematic view of the structure of the planter of the present invention;

FIG. 5 is a schematic diagram of a grouting system according to the present invention;

FIG. 6 is a schematic view of the nozzle arrangement state structure of the present invention;

FIG. 7 is a schematic side view of the nozzle position of the present invention;

FIG. 8 is a schematic view of a grouting tool head according to the invention;

fig. 9 is a schematic side view of a tool bit construction of the present invention.

Reference numerals: 1-plow frame, 11-butt-joint frame, 12-inclined frame, 2-seeder, 21-installation frame, 211-adjusting vertical frame, 212-horizontal frame seat, 3-grouting system, 31-slurry tank, 311-tank body, 312-pressurizer, 32-grouting pipe, 33-spray pipe, 4-grouting tool bit, 41-tool bit and 42-grouting cavity.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

As shown in figures 1 and 2, the construction equipment for the mineralized barrier layer of microorganisms in deep saline soil is suitable for the construction of the mineralized barrier layer of large-area powder saline soil, due to poor permeability of the powder saline soil, no matter in a traditional excavation treatment mode or a treatment mode of deep grouting in soil by using a pneumatic device, slurry can not be guaranteed to penetrate to a required thickness, and further the formed mineralized barrier layer is difficult to achieve the effect of blocking salt migration.

The concrete implementation principle of the invention is that the construction equipment is connected to a four-wheel tractor, the tractor drags the construction equipment to move forward when moving forward, the grouting tool bit 4 can penetrate into the soil body to form a cavity according to the required depth, meanwhile, the grouting system 3 sprays slurry consisting of bacterial liquid and cementing liquid from the spray pipe 33 in the grouting tool bit 4 according to the set parameters, the slurry is sprayed into the soil body cavity formed by the grouting tool bit 4, after the grouting tool bit 4 passes, the upper soil body covers the cavity, the slurry is diffused and permeated, and then a mineralized barrier layer is formed; at the same time of grouting, the seeding machine 2 can be used for sowing seeds of salt-producing pasture plants on the soil surface layer, so that the simultaneous sowing of the underground barrier layer and the overground plants is realized, and time and labor are saved.

As shown in fig. 1, 7, 8 and 9, further, the grouting tool bit 4 comprises a connecting frame and a tool bit 41, the tool bit 41 is fixedly connected to the plow frame 1 through the connecting frame and is used for forming a cavity in soil body to realize slurry injection, and the soil body above the grouting tool bit directly covers the slurry after the slurry injection to realize that the slurry permeates to the periphery to form a mineralized barrier layer; the connecting frame is fixedly connected to the plow frame 1 through bolts, when the height of the grouting tool bit 4 is adjusted, the connecting angle of the plow frame 1 and the tractor is adjusted firstly, then the connecting angle of the connecting frame and the plow frame 1 is changed, the adjusting of the connecting angle of the grouting tool bit 4 and the plow frame 1 is realized, and the grouting tool bit 4 is positioned at different heights in soil through the matching of the adjusting; the tool bit 41 is provided with a grouting cavity 42 for installing the spray pipe 33, the grouting cavity 42 is arranged at the rear side of the tool bit 41, the opening is backwards, when the grouting tool bit 4 advances, a cavity is formed at the tail of the grouting tool bit, the spray pipe 33 sprays slurry backwards into the cavity, then soil covers to form a uniform slurry layer, then the uniform slurry layer is mineralized to form a blocking layer, and the spray pipe 33 is positioned in the grouting cavity 42.

As shown in fig. 1 and 5, further, the slurry tank 31 includes a tank body 311, a pressurizer 312 and a pressure gauge, the tank body 311 is disposed on the plow frame 1, the pressurizer 312 and the pressure gauge are connected to the top of the tank body 311, the pressurizer 312 is used for pressurizing the tank body 311, different pressures are applied according to different grouting amounts, the pressure gauge is used for displaying specific pressure values, and the grouting pipe 32 is connected to the bottom of the tank body 311.

As shown in fig. 6 and 7, further, the grouting cavity 42 is disposed parallel to the rear end face of the cutter head 41, the spray pipes 33 are disposed parallel to the grouting cavity 42, the spray pipes 33 are respectively connected with the grouting pipes 32, the spray pipes 33 are provided with spray holes, and the spray holes are disposed at intervals on the rear side of the spray pipes 33 and face the opening direction of the grouting cavity 42; the grouting pipe 32 is provided with a valve, the valve is opened when grouting is performed, and the valve is closed when grouting is not needed.

Further, the grouting system 3 is provided with two sets, each set comprises a slurry tank 31, a grouting pipe 32 and a spray pipe 33, the two spray pipes 33 are parallel and are arranged in the grouting cavity 42 in a vertically staggered mode, and the two grouting pipes 32 are respectively arranged on two sides of the inclined frame 12 and are respectively connected with the two spray pipes 33.

Preferably, the nozzle 33 is connected to the grouting pipe 32 through a tee joint.

As shown in fig. 4, further, the seeder 2 includes a mounting frame 21, a seed and fertilizer box provided on the mounting frame 21, and a furrow opener provided below the seed and fertilizer box; the mounting frame 21 comprises an adjusting vertical frame 211 and a horizontal frame seat 212, the adjusting vertical frames 211 are arranged on the plow frame 1 in pairs, the horizontal frame seat 212 is arranged between the adjusting vertical frames 211, and the seed fertilizer box is arranged in the horizontal frame seat 212.

As shown in fig. 4, further, the adjusting mullion 211 is provided with adjusting holes, the adjusting holes are arranged in pairs and are arranged at intervals up and down, the adjusting mullion 211 is connected to the inclined frame 12 through bolts, the horizontal mullion seat 212 is connected to the adjusting mullion 211 through bolts, the installation height of the adjusting mullion 211 on the inclined frame 12 is adjusted by adjusting the position of the bolts in the adjusting holes, and the installation height of the horizontal mullion seat 212 on the adjusting mullion 211 is adjusted.

As shown in fig. 3, further, the plow frame 1 comprises a butt joint frame 11, an inclined frame 12 and a placing frame, the butt joint frame 11 is connected with a tractor, mounting holes are formed in the butt joint frame 11 at intervals, the inclined frame 12 is connected to the butt joint frame 11 through bolts arranged in the mounting holes, the height of the inclined frame 12 is adjusted through the positions of adjusting bolts in the mounting holes, the sowing machine 2 is arranged in the middle of the inclined frame 12, the grouting tool bit 4 is arranged at the tail of the inclined frame 12, the placing frame is arranged between the inclined frames 12, and the slurry tank 31 is arranged in the placing frame and is located above the ground.

Further, the inclined frame 12 is arranged in a downward inclined manner, a through groove is formed in the inclined frame 12, the grouting pipe 32 is arranged in the through groove, and the grouting pipe 32 is placed and protected, so that the grouting pipe 32 is prevented from falling off or breaking due to soil body obstruction.

Further, the cross section of the tool bit 41 is right triangle, the front side included angle is 7.59 degrees, the bottom surface of the tool bit 41 is horizontally arranged, the rear end surface is vertically arranged, the cross section of the grouting cavity 42 is of a V-shaped structure which is vertically symmetrically arranged, and the included angle is 11 degrees.

When the mineralized barrier layer is used for operation, two operation modes exist, one is one-time grouting molding, and the other is multi-time grouting molding.

The primary grouting forming is to spray the slurry with preset amount into the corresponding soil layer once when using the construction equipment to perform operation, and the seeding machine also performs seeding operation synchronously, namely, the sufficient grouting and seeding operation is completed once. The method can finish operation once, saves manpower and material resources, has high construction efficiency and small damage to soil, but has small single construction area due to large single grouting amount and limited slurry storage amount of the slurry tank 31, frequent slurry supplementing is needed, mineralized barrier layers formed before and after slurry supplementing cannot be effectively connected to form a whole, salt can be evaporated from gaps between regional barrier layers to upper soil aggregation, so that the barrier effect is poor, and although the single grouting amount is large, the permeability of powdery salty soil is poor, the slurry can not be uniformly diffused, the thickness, the uniformity and the integrity of the barrier layers can not be ensured to meet the requirements, and the formed barrier layers can not be ensured to meet the barrier requirements.

The one-time grouting forming is suitable for the operation construction of scattered small-area soil mass, and the requirement of the land area can be met by single grouting. In operation, the slurry tank 31 is pressurized at 1-1.5MPa, a minute of land with a thickness of 12 square meters is treated, the single grouting amount is 5L per square meter, and the slurry can form a mineralized barrier layer with a thickness of 10cm after permeation.

The operation method of the invention is repeated grouting molding, the lowest mineralization barrier layer is molded firstly by adopting a repeated grouting mode from bottom to top to form a layer of continuous mineralization barrier layer, then the grouting depth is lifted upwards, the mineralization barrier layer is molded again, the grouting operation is carried out for 3-5 times to form the mineralization barrier layer with the thickness meeting the requirement, the single layer of the finally formed mineralization barrier layer is continuous, uniform and complete, the requirement on permeability is lower in single grouting, and the upper and lower layers can mutually infiltrate to form an integrated multi-layer mineralization barrier layer, so that the effect of preventing salt evaporation aggregation is better; compared with the operation mode of one-time grouting molding, the operation method of multiple grouting molding reduces the pressure in the slurry tank 31, further reduces the single grouting amount, forms a mineralized barrier layer with the thickness of 3-5cm for one time, has the advancing speed of 5 times of the advancing speed of the single grouting, can treat the land with the square meter of 100-150 square meters in one minute, and can meet the soil grouting with the area of one mu in the single grouting.

The operation method of the construction equipment of the microorganism mineralization barrier layer in the deep saline soil is repeated grouting molding, and comprises the following steps,

s1, leveling a land to be subjected to mineralized barrier layer construction;

s2, connecting the equipment with a tractor, adjusting the installation height and angle of the grouting tool bit 4, starting the tractor to perform debugging operation in front of the tractor, and pressing the grouting tool bit 4 into soil to a depth of 30cm, namely, the depth of a mineralized barrier layer is 30cm;

s3, closing the tractor, and injecting bacterial liquid and cementing liquid into the grouting system 3 to form mixed slurry, wherein the bacterial liquid and the cementing liquid in the slurry are prepared according to the following steps of 1:2, proportioning;

s4, starting the tractor, pressurizing the grouting system 3, enabling the tractor to move forwards and opening a valve on the grouting system 3, and grouting a mineralized barrier layer at the bottom layer along with the front movement of the tractor, wherein the pressure value is 0.6 MPa;

s5, after grouting of the mineralized barrier layer of the bottom layer is completed, the height of the grouting tool bit 4 is upwards adjusted by 3cm, and due to poor permeability of the powdery saline soil, after single grouting, slurry permeates to the periphery to form a mineralized barrier layer of about 3cm, the main permeation direction of the slurry is downwards, after grouting tool bit 4 is heightened by 3cm, the grouting tool bit 4 and the mineralized barrier layer formed by the last grouting can be mutually permeated and connected into a whole; starting a tractor to carry out debugging operation, pressing the grouting tool bit 4 into soil so that the height of the grouting tool bit 4 is 3cm higher than that of a mineralized barrier layer at the bottom layer, and then carrying out grouting operation of the mineralized barrier layer at the surface layer according to the operation of S3-S4;

s6, grouting the mineralized barrier layer of the 1-2 subsurface layers according to the different soil properties and components of the soil body and the operation of S5, and finally forming the mineralized barrier layer with the thickness of 10 cm;

s7, after the mineralized barrier layer grouting is completed, placing seeds and fertilizer in the seeder 2, adjusting the height of the seeder 2, starting the tractor to carry out front row debugging operation, pressing the seeder 2 into the soil body by 1cm, sowing pasture seeds in the soil body by 1cm, and carrying out front row sowing operation of the tractor;

and S8, after all the operations are completed, sampling is carried out to verify the mineralization performance of the barrier layer.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. The utility model provides a microorganism mineralization barrier layer construction equipment in deep saline soil, characterized by, including plow frame (1), seeder (2), slip casting system (3) and slip casting tool bit (4), the upper portion of plow frame (1) is located subaerial, and the lower part is located the soil body, the middle part at plow frame (1) is established in seeder (2), and its bottom is located the soil body top layer, slip casting tool bit (4) are located the afterbody of plow frame (1), are located the soil body deep, the level of slip casting tool bit (4) is less than the level of seeder (2), slip casting system (3) are including thick liquid jar (31), slip casting pipe (32) and spray tube (33), thick liquid jar (31) are established on plow frame (1), spray tube (33) are established in slip casting tool bit (4), spray tube (33) are connected with thick liquid jar (31) through slip casting pipe (32).

2. The device for constructing a microbial mineralization barrier layer in deep saline soil according to claim 1, which is characterized in that: the grouting tool bit (4) comprises a connecting frame and a tool bit (41), the tool bit (41) is fixedly connected to the plow frame (1) through the connecting frame, a grouting cavity (42) is formed in the tool bit (41), the grouting cavity (42) is formed in the rear side of the tool bit (41), an opening is towards the rear, and the spray pipe (33) is located in the grouting cavity (42).

3. The device for constructing a microbial mineralization barrier layer in deep saline soil according to claim 1, which is characterized in that: the slurry tank (31) comprises a tank body (311), a pressurizer (312) and a pressure gauge, wherein the tank body (311) is arranged on a plow frame (1), the pressurizer (312) and the pressure gauge are connected to the top of the tank body (311), and the grouting pipe (32) is connected to the bottom of the tank body (311).

4. The device for constructing a microbial mineralization barrier layer in deep saline soil according to claim 2, which is characterized in that: the spray pipes (33) are arranged in the grouting cavity (42) in parallel, spray holes are formed in the spray pipes (33), and are arranged at intervals on the rear side of the spray pipes (33) and face the opening direction of the grouting cavity (42); and a valve is arranged on the grouting pipe (32).

5. The device for constructing a microbial mineralization barrier layer in deep saline soil according to claim 1, which is characterized in that: the seeder (2) comprises a mounting frame (21), a seed and fertilizer box and a furrow opener, wherein the seed and fertilizer box is arranged on the mounting frame (21), and the furrow opener is arranged below the seed and fertilizer box; the mounting rack (21) comprises an adjusting vertical frame (211) and a horizontal frame seat (212), the adjusting vertical frames (211) are arranged on the plow frame (1) in pairs, the horizontal frame seat (212) is arranged between the adjusting vertical frames (211), and the seed fertilizer box is arranged in the horizontal frame seat (212).

6. The device for constructing a microbial mineralization barrier layer in deep saline soil according to claim 5, wherein the device comprises: the adjustable plough frame is characterized in that adjusting holes are formed in the adjusting vertical frames (211) at intervals, bolts are arranged in the adjusting holes, the adjusting vertical frames (211) are connected to the plough frame (1) through bolts, and the horizontal frame base (212) is connected to the adjusting vertical frames (211) through bolts.

7. The device for constructing a microbial mineralization barrier layer in deep saline soil according to claim 1, which is characterized in that: the plow frame (1) comprises a butt joint frame (11), an inclined frame (12) and a placing frame, wherein the butt joint frame (11) is connected with a tractor, the inclined frame (12) is connected to the butt joint frame (11) through bolts, the seeder (2) is arranged in the middle of the inclined frame (12), the grouting tool bit (4) is arranged at the tail of the inclined frame (12), the placing frame is arranged between the inclined frames (12), and the slurry tank (31) is arranged in the placing frame.

8. The device for constructing a microbial mineralization barrier layer in deep saline soil according to claim 7, wherein the device comprises: the inclined frame (12) is arranged in a downward inclined mode, a through groove is formed in the inclined frame (12), and the grouting pipe (32) is arranged in the through groove.

9. The device for constructing a microbial mineralization barrier layer in deep saline soil according to claim 2, which is characterized in that: the section of the tool bit (41) is triangular, and the section of the grouting cavity (42) is of a V-shaped structure.

10. The method for constructing a microbial mineralization barrier layer in deep saline soil according to any one of claims 1 to 9, comprising the steps of,

s1, leveling a land to be subjected to mineralized barrier layer construction;

s2, connecting the equipment with a tractor, adjusting the installation height and angle of a grouting tool bit (4), starting the tractor to perform debugging operation in front, and pressing the grouting tool bit (4) into soil to a depth of 20-40 cm;

s3, closing the tractor, and injecting bacterial liquid and cementing liquid into the grouting system (3);

s4, starting the tractor, pressurizing the grouting system (3), wherein the pressure value is 0.5-0.8MPa, and the tractor moves forward and opens a valve on the grouting system (3) to perform grouting operation of a mineralized barrier layer at the bottom layer along with the forward movement of the tractor;

s5, after the grouting of the mineralized barrier layer at the bottom layer is finished, the height of a grouting tool bit (4) is upwards adjusted by 3-5cm, the front row of the tractor is started to carry out debugging operation, the grouting tool bit (4) is pressed into soil, the height of the grouting tool bit (4) is 3-5cm higher than the mineralized barrier layer at the bottom layer, and then the grouting operation of the mineralized barrier layer at the surface layer is carried out according to the operation of S3-S4;

s6, grouting the mineralized barrier layer of the 1-2 subsurface layers according to the different soil quality and components of the soil body and the operation of S5, and finally forming the mineralized barrier layer with the thickness of 10-15 cm;

s7, after the mineralized barrier layer grouting is completed, placing seeds and fertilizer in the seeder (2), adjusting the height of the seeder (2), starting the front row of the tractor to carry out debugging operation, pressing the seeder (2) into the soil body by 1-2cm, and carrying out sowing operation in front of the tractor;

and S8, after all the operations are completed, sampling is carried out to verify the mineralization performance of the barrier layer.