A saline-alkali soil in-situ drilling and filling and ramming integrated device and a saline-alkali soil treatment method

Abstract

This invention relates to an integrated drilling, filling, and compaction equipment and method for saline-alkali land remediation, comprising: a mobile chassis; a dual-station mixing assembly mounted on the mobile chassis, the dual-station mixing assembly including a first mixing chamber and a second mixing chamber arranged side by side, the discharge port of the first mixing chamber and the inlet of the second mixing chamber being connected by a soil transport pipe, a first auger rotating inside the first mixing chamber, and a second auger rotating inside the second mixing chamber; and a partition layer disposed between the first mixing chamber and the second mixing chamber.

Description

Technical Field

[0001] This invention relates to the field of saline-alkali land treatment equipment, specifically to an integrated equipment for in-situ drilling, modification, filling, and compaction of saline-alkali land, and a method for saline-alkali land treatment. Background Technology

[0002] Salinization is caused by high groundwater levels and intense surface evaporation, leading to the rise of deep salts via capillary water and their accumulation on the surface. Current mainstream remediation strategies mainly include:

[0003] 1. Physical barrier method: such as laying an isolation layer, which aims to cut off the upward path of capillaries.

[0004] 2. Leaching and drainage method: The surface salt is leached downwards through irrigation.

[0005] 3. Deep tillage and loosening method: Deep tillage breaks up the compacted layer and accelerates short-term salt leaching.

[0006] 4. Chemical modification method: Apply substances such as gypsum and sulfur to neutralize alkalinity and replace sodium ions.

[0007] 5. Ecological restoration method: Planting salt-tolerant plants.

[0008] These methods generally suffer from limitations such as fragmented processes, high costs, limited effectiveness, or difficulty in achieving lasting results. Therefore, there is an urgent need for an innovative technology that can integrate key governance processes and build long-term modified governance solutions. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide an integrated equipment for in-situ drilling, filling and compaction of saline-alkali land and a method for saline-alkali land treatment.

[0010] The present invention adopts the following technical solution:

[0011] An integrated drilling, filling, and compaction device for saline-alkali land includes:

[0012] Mobile chassis;

[0013] A dual-station mixing assembly is mounted on the mobile chassis. The dual-station mixing assembly includes a first mixing chamber and a second mixing chamber arranged side by side. The discharge port of the first mixing chamber and the inlet of the second mixing chamber are connected by a soil conveying pipe. A first auger is rotatably installed in the first mixing chamber, and a second auger is rotatably installed in the second mixing chamber.

[0014] A partition is provided between the first mixing chamber and the second mixing chamber;

[0015] A spiral drill rod, wherein the axis of the spiral drill rod is a first axis, the spiral drill rod is rotatably mounted on the movable chassis about the first axis, and the spiral drill rod is movable on the movable chassis along the first axis;

[0016] The conveying pipe has a second axis as its axis, which is perpendicular or substantially perpendicular to the horizontal plane. The conveying pipe is movably mounted on the mobile chassis along the second axis. The pipe wall of the conveying pipe has a first outlet and a second inlet, which are spaced apart in the circumferential and axial directions of the second axis.

[0017] A soil tamping device, comprising a transverse platform movably mounted on a mobile chassis, a winch mounted on the transverse platform, and a counterweight block connected to the winch by a cable;

[0018] The in-situ drilling, filling and compaction integrated equipment for saline-alkali land has at least a first state and a second state.

[0019] When the in-situ drilling, filling and compaction integrated equipment for saline-alkali land is in the first state, the first outlet is aligned and connected with the inlet of the first mixing chamber, the side wall of the conveying pipe blocks the outlet of the second mixing chamber, the side wall of the second mixing chamber blocks the second inlet, and the spiral drill rod passes through the middle of the conveying pipe.

[0020] When the in-situ drilling, filling and compaction integrated equipment for saline-alkali land is in the second state, the second inlet is aligned and connected with the outlet of the second mixing chamber, the side wall of the conveying pipe blocks the inlet of the first mixing chamber, the side wall of the first mixing chamber blocks the first outlet, and the spiral drill rod is located above the conveying pipe and spaced apart from the upper end of the conveying pipe to allow the counterweight to be located at the upper end of the conveying pipe.

[0021] In some embodiments of this application, the delivery pipe includes a pipe body and an elastic collar disposed at the lower end of the pipe body.

[0022] In some embodiments of this application, the in-situ drilling, filling and compaction integrated equipment for saline-alkali land further includes a drive mechanism, which is used to control the rotation of the auger drill rod around the first axis and the movement along the direction of the first axis;

[0023] A pivotable drill rod frame is mounted on the mobile chassis, and the auger drill rod and the drive mechanism are located on the drill rod frame. A hydraulic drive rod is also provided on the mobile chassis, and the two ends of the hydraulic drive rod are respectively hinged to the mobile chassis and the drill rod frame.

[0024] In some embodiments of this application, the drive mechanism includes a first motor and a second motor, a guide rod is provided on the drill rod frame, a drill rod platform is slidably mounted on the guide rod, and the first motor and the auger drill rod are disposed on the drill rod platform to allow the first motor to control the rotation of the auger drill rod;

[0025] A sprocket is provided at each end of the drill rod frame, and a chain is provided between the two sprockets. The second motor drives one of the sprockets, and the chain is connected to the drill rod platform.

[0026] In some embodiments of this application, when the in-situ drilling, filling and compaction integrated equipment for saline-alkali land is in the second state, the spiral drill rod is parallel to the horizontal plane and is spaced apart at the upper end of the conveying pipe.

[0027] In some embodiments of this application, the mobile chassis is provided with a feeding system, which is used to add the modifier into the first mixing chamber.

[0028] In some embodiments of this application, the in-situ drilling, filling and compaction integrated equipment for saline-alkali land further includes a sand and gravel adding device movably mounted on the mobile chassis. When the in-situ drilling, filling and compaction integrated equipment for saline-alkali land is in the second state, the sand and gravel adding device is allowed to move to the upper end of the conveying pipe.

[0029] A method for treating saline-alkali land, based on the aforementioned integrated in-situ drilling, relocation, and compaction equipment for saline-alkali land, the method comprising:

[0030] The in-situ drilling, filling and compaction equipment for saline-alkali land is controlled in the first state. The lower end of the conveying pipe is in contact with the soil surface. The spiral drill rod continuously rotates and drills down to break up the soil surface and gradually form a borehole. The broken soil gradually rises to the first outlet through the cooperation of the spiral blades on the spiral drill rod and the conveying pipe, and then enters the first mixing chamber.

[0031] The first screw rotates so that the blades on the first screw push the soil, which is then transported through the soil transport pipe to the second mixing chamber. The second screw then rotates to further mix and break up the soil, thereby further maturing the soil.

[0032] Once the borehole reaches the predetermined depth, the auger rod stops rotating, and simultaneously the auger rod and the conveying pipe are lifted to switch the in-situ drilling, modification, and compaction equipment for saline-alkali land to the second state. Then, through the rotation of the second auger rod, the blades on the second auger rod push the soil in the second mixing chamber, causing it to enter the conveying pipe through the outlet of the second mixing chamber, and then backfill into the borehole under the guidance of gravity and the conveying pipe.

[0033] The traversing platform, in conjunction with the winch, moves the counterweight to the upper end of the conveying pipe. Then, the winch releases the cable, and the counterweight, guided by the conveying pipe, impacts the backfill soil on the borehole. The counterweight is then repeatedly lifted and lowered within the conveying pipe to compact the backfill soil in the borehole.

[0034] In some embodiments of this application, during the process of the second screw conveying the soil in the second mixing chamber to the conveying pipe, the sand and gravel adding device is located at the upper end of the conveying pipe to convey sand and gravel into the conveying pipe;

[0035] As soil continues to fall into the delivery pipe, the valve opening of the sand and gravel addition device gradually decreases.

[0036] In some embodiments of this application, the elastic collar is always in contact with the ground.

[0037] Compared with existing technologies, the advantages of this application are as follows: It integrates drilling, modification, backfilling, and compaction into a single piece of equipment and completes the process in a single cycle, greatly improving treatment efficiency and precision while reducing overall costs; it can construct a permeable column that decreases from bottom to top. The relatively low permeability layer at the top effectively blocks the rise of capillary water during drought periods, while the permeability increases further down, effectively collecting and draining salts from the surrounding soil; the modifier is slowly released with the water, continuously neutralizing the alkalinity of the surrounding soil and replacing sodium ions, achieving in-situ simultaneous and long-term drainage and salt removal with soil chemical modification; and it utilizes in-situ soil as the main material, effectively reducing costs. Attached Figure Description

[0038] Figure 1 This is a side view of the in-situ drilling, filling, and compaction integrated equipment for saline-alkali land in the embodiments of this application;

[0039] Figure 2 This is a top view of the dual-station stirring assembly in an embodiment of this application;

[0040] Figure 3 This is a schematic diagram of the in-situ drilling, modification, and compaction integrated equipment for saline-alkali land in the second state, as described in the embodiments of this application. Figure 1 ;

[0041] Figure 4 This is a schematic diagram of the in-situ drilling, filling, and compaction integrated equipment for saline-alkali land in the first state, as described in the embodiments of this application.

[0042] Figure 5 This is a schematic diagram of the in-situ drilling, modification, and compaction integrated equipment for saline-alkali land in the second state, as described in the embodiments of this application. Figure 2 ;

[0043] Figure 6This is a schematic diagram of the relevant structure of the auger drill pipe in the embodiments of this application. Detailed Implementation

[0044] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0050] First, the inventors conducted an in-depth analysis of the systemic challenges currently faced by saline-alkali land management technologies. Although methods such as physical barriers, leaching and drainage, deep tillage and loosening, chemical modification, and ecological restoration each have their own mechanisms of action, in actual engineering projects, multiple pieces of equipment and multiple processes are often required in succession, resulting in long operation cycles, high costs, and susceptibility to errors in the coordination of processes. More importantly, these methods often only provide short-term solutions to single problems, lacking a comprehensive and long-term management technology solution.

[0051] For example, simply drilling and filling with sand can create a drainage column, which is merely physical drainage. It accelerates the leaching and removal of salts by creating a highly permeable vertical channel in the soil layer, but it cannot alter the chemical properties of the surrounding soil. Furthermore, drainage columns have drawbacks. During dry seasons, strong surface evaporation creates suction, causing groundwater to rise rapidly to the surface along this less resistant channel. After evaporation, salts crystallize and accumulate in the topsoil or crop root zone, causing secondary salinization. It also consumes a lot of sand and gravel, resulting in high costs and making it unsuitable for large-scale remediation. On the other hand, simply applying surface modifiers is unlikely to affect deeper soil layers and is easily eroded.

[0052] Based on this, refer to Figures 1 to 6 This embodiment provides an integrated drilling, filling, and compaction equipment for saline-alkali land. The equipment mainly includes a mobile chassis 1, a dual-station mixing assembly, a partition layer 4, a spiral drill rod 5, a conveying pipe 6, and a soil compaction device 7.

[0053] The mobile chassis 1 serves as a walking mechanism, which can be self-powered or towed by other power sources as a tractor.

[0054] The dual-station mixing assembly is mounted on top of the mobile chassis 1. The assembly includes a first mixing chamber 2 and a second mixing chamber 3 arranged side-by-side. A partition 4 is positioned between the two chambers to separate them. The partition 4 not only provides structural support but also serves as the location of the vertical operating channel. The auger drill rod 5, conveying pipe 6, and soil compaction device 7 are all located within the partition 4, achieving a high degree of integration and compact layout of the functional modules. Furthermore, the discharge port of the first mixing chamber 2 and the inlet of the second mixing chamber 3 are connected via a soil transport pipe (not shown in the figure). A first auger is rotatably mounted inside the first mixing chamber 2, and a second auger is rotatably mounted inside the second mixing chamber 3.

[0055] The auger drill rod 5 is driven by a drive mechanism, and both the auger drill rod 5 and the drive mechanism are mounted on the movable chassis 1. The axis of the auger drill rod 5 is the first axis. The drive mechanism can not only control the rotation of the auger drill rod 5 around the first axis on the movable chassis 1, but also control the movement of the auger drill rod 5 along the first axis on the movable chassis 1. One end of the auger drill rod 5 is a drill bit, which is used to break and drill through the soil.

[0056] The conveying pipe 6 is also mounted on the movable chassis 1. The axis of the conveying pipe 6 is the second axis, which is perpendicular or substantially perpendicular to the horizontal plane (for example, the angle between the second axis and the horizontal plane is 85°-90°). The conveying pipe 6 can move along the second axis on the movable chassis 1. A first outlet 601 and a second inlet 602 are provided on the pipe wall of the conveying pipe 6. The first outlet 601 and the second inlet 602 are not only spaced apart axially along the second axis, but also spaced apart circumferentially along the second axis. Thus, during the lifting and lowering process of the conveying pipe 6, the first outlet 601 can be connected to the feed inlet of the first mixing chamber 2, or the second inlet 602 can be connected to the discharge outlet of the second mixing chamber 3. However, it is worth noting that in this embodiment, the connection of the first outlet 601 to the feed inlet of the first mixing chamber 2 and the connection of the second inlet 602 to the discharge outlet of the second mixing chamber 3 cannot be achieved simultaneously.

[0057] The ramming device 7 includes a transverse platform 701 that is movable on a mobile chassis 1, a winch 702 mounted on the transverse platform 701, and a counterweight 703 connected to the winch 702 by a cable.

[0058] The working process of the in-situ drilling, modification, and compaction integrated equipment for saline-alkali land in this embodiment is as follows:

[0059] Drilling and Conveying Stage: At this stage, the in-situ drilling, filling, and compaction integrated equipment for saline-alkali land is in its first state. Specifically, the conveying pipe 6 moves downward on the movable chassis 1, so that its lower end abuts against the soil surface. Simultaneously, the first outlet 601 is aligned and connected with the feed inlet of the first mixing chamber 2. The spiral drill rod 5 passes through the middle of the conveying pipe 6, and the drill bit is specifically located at the lower end of the spiral drill rod 5. The spiral drill rod 5 continuously rotates and drills downward to break up the soil surface and gradually form a borehole. The broken soil gradually rises to the first outlet 601 through the cooperation of the spiral blades on the spiral drill rod 5 and the conveying pipe 6, and then enters the first mixing chamber 2.

[0060] Soil Modification Stage: A feeding system is installed on the mobile chassis 1. This system adds modifiers to the first mixing chamber 2. Under the rotation of the first auger, the soil entering the first mixing chamber 2 mixes with the modifier, achieving initial soil modification. Simultaneously, the blades on the first auger are configured to push the initially modified soil as it rotates, transporting it through the soil conveying pipe to the second mixing chamber 3. The second auger in the second mixing chamber 3 then further mixes and breaks up the initially modified soil through rotation, further maturing the soil. The dual-chamber design of the first mixing chamber 2 and the second mixing chamber 3 extends the mixing time between the soil and the modifier, ensuring sufficient contact and reaction between the modifier and soil particles. The modifier includes, but is not limited to, one or more of gypsum powder, humic acid, and specialized microbial agents.

[0061] It is worth noting that during the drilling and conveying stage and the soil modification stage, the second inlet 602 is not connected to the outlet of the second mixing chamber 3. The outlet of the second mixing chamber 3 is blocked by the side wall of the conveying pipe 6, and the second inlet 602 is also blocked by the side wall of the second mixing chamber 3. This can further extend the mixing time of the soil in the second mixing chamber 3.

[0062] Backfilling Stage: After the borehole reaches the predetermined depth, the auger rod 5 stops rotating, and simultaneously, the auger rod 5 and the conveying pipe 6 are lifted so that the inlet of the first mixing chamber 2 is blocked by the side wall of the conveying pipe 6, and the first outlet 601 is blocked by the side wall of the first mixing chamber 2. At the same time, the second inlet 602 is aligned and connected with the outlet of the second mixing chamber 3. The lifting distance of the auger rod 5 is much greater than that of the conveying pipe 6, so that the auger rod 5 is above the conveying pipe 6 and detached from the conveying pipe 6. At this time, the in-situ drilling, modification, and compaction equipment for saline-alkali land is in the second state. The blades on the second auger rod are configured such that, as the second auger rod rotates, the blades on the second auger rod will push the soil in the second mixing chamber 3, causing it to enter the conveying pipe 6 through the outlet of the second mixing chamber 3, and then, under the guidance of gravity and the conveying pipe 6, accurately backfill into the borehole.

[0063] Under this workflow design, in some embodiments, the in-situ drilling-modification-filling-compaction integrated equipment for saline-alkali land can further include a sand and gravel adding device movably mounted on the mobile chassis 1. When the in-situ drilling-modification-filling-compaction integrated equipment for saline-alkali land is in its second state, the sand and gravel adding device can be moved to the upper end of the delivery pipe 6. At the beginning of backfilling, the valve opening of the sand and gravel adding device is adjusted to the maximum, and a large amount of sand and gravel falls continuously to mix with the modified soil falling in the delivery pipe 6 and fill to the bottom of the borehole. As backfilling progresses, the valve opening of the sand and gravel adding device gradually decreases and eventually closes. After the borehole is backfilled, a structure with smoothly decreasing permeability will be formed from bottom to top. Specifically, the bottom of the borehole has better permeability, which helps the modifier in the backfill soil to diffuse to the surrounding soil; while the backfill soil at the top of the borehole has poor permeability, which can effectively inhibit the rise of capillary water during dry periods and prevent salt from returning to the surface with evaporation.

[0064] Compaction Stage: After backfilling is completed, the sand and gravel adding device can leave from above the conveying pipe 6. Then, the transverse platform 701, together with the winch 702, moves the counterweight 703 to the upper end of the conveying pipe 6 to ensure that the counterweight 703 can be aligned with the borehole. Then, the winch 702 releases the cable, and the counterweight 703 automatically falls under the guidance of the conveying pipe 6 to accurately impact the backfill soil on the borehole. Then, it is lifted and dropped multiple times in the conveying pipe 6 to compact the backfill soil in the borehole and form a dense modified soil column.

[0065] Preferably, a pivotable drill rod frame 101 is mounted on the mobile chassis 1, and the auger drill rod 5 and the drive mechanism are mounted on the drill rod frame 101. The mobile chassis 1 also has a hydraulic drive rod 102, with both ends hinged to the mobile chassis 1 and the drill rod frame 101, respectively. Thus, the hydraulic drive rod 102 can control the rotation of the drill rod frame 101 through extension and retraction, thereby allowing the auger drill rod 5 to switch between two states: parallel to the horizontal plane and perpendicular to the horizontal plane. Specifically, during the drilling and conveying stage and the soil modification stage, the auger drill rod 5 is in a state perpendicular to the horizontal plane, while during the backfilling stage, it is in a state parallel to the horizontal plane. This allows the auger drill rod 5 to better avoid the upper end of the conveying pipe 6, thereby allowing the sand and gravel adding device or the soil compaction device 7 to better cooperate with the conveying pipe 6.

[0066] Furthermore, the drive mechanism includes a first motor 105 and a second motor 107. A guide rod 103 is provided on the drill rod frame 101, and a drill rod platform 104 is slidably mounted on the guide rod 103. The first motor 105 and the auger drill rod 5 are mounted on the drill rod platform 104, allowing the first motor 105 to control the rotation of the auger drill rod 5. A sprocket 106 is provided at each end of the drill rod frame 101, and a chain is provided between the two sprockets 106. The second motor 107 drives one of the sprockets 106, and the chain is connected to the drill rod platform 104. When the second motor 107 drives the sprocket 106 to rotate, it can drive the first motor 105 and the auger drill rod 5 on the drill rod platform 104 to move. Thus, when the auger drill rod 5 is perpendicular to the horizontal plane, the second motor 107 can control the auger drill rod 5 to rise and fall.

[0067] It is particularly important to emphasize that the movement of the mobile chassis 1 was not involved in any of the above-mentioned processes. During drilling, the delivery pipe 6 provides guidance for the auger drill rod 5 to ensure the verticality of the borehole; during backfilling, the delivery pipe 6 serves as a channel for the modified soil to fall, accurately guiding the backfill material into the original hole; during compaction, the inner cavity of the delivery pipe 6 guides the free-fall motion of the counterweight 703, ensuring that the impact force acts perpendicularly on the central axis of the backfill column. In other words, the delivery pipe 6 is the positioning reference for the three processes of drilling, backfilling, and compaction.

[0068] Preferably, in this embodiment, the conveying pipe 6 includes a pipe body and an elastic collar 603 disposed at the lower end of the pipe body, with the first outlet 601 and the second inlet 602 located on the pipe body. Specifically, during the drilling and soil extraction stage, the conveying pipe 6 compresses the ground, causing the elastic collar 603 to be under significant compression, thus ensuring that the elastic collar 603 is tightly attached to the ground. This effectively prevents soil debris from escaping from around the pipe opening, ensuring that all excavated soil enters the conveying pipe 6 and is lifted upwards by the auger drill rod 5, while simultaneously blocking external debris from entering the working channel. During the backfilling stage, although the pipe body is raised, increasing the gap between the lower end of the pipe body and the ground, the elastic collar 603 can effectively fill the gap between the lower end of the pipe body and the ground by restoring its elasticity. This prevents the backfill soil and gravel from detaching from the gap between the lower end of the pipe body and the ground during the fall, ensuring that the backfill soil and gravel can fill the borehole. During the compaction stage: the elastic collar 603 can continue to fill the gap between the lower end of the pipe and the ground, thereby using the elastic collar 603 to guide the counterweight 703.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A device for in-situ drilling, modification, filling, and compaction of saline-alkali land, characterized in that, include: Mobile chassis (1); A dual-station mixing assembly is mounted on the mobile chassis (1). The dual-station mixing assembly includes a first mixing chamber (2) and a second mixing chamber (3) arranged side by side. The discharge port of the first mixing chamber (2) and the inlet of the second mixing chamber (3) are connected by a soil conveying pipe. A first screw rod is rotatably arranged inside the first mixing chamber (2), and a second screw rod is rotatably arranged inside the second mixing chamber (3). A partition (4) is provided between the first mixing chamber (2) and the second mixing chamber (3); The spiral drill rod (5) has an axis that is a first axis. The spiral drill rod (5) is rotatably mounted on the movable chassis (1) around the first axis and is movable along the first axis on the movable chassis (1). The conveying pipe (6) has a second axis as its axis. The second axis is perpendicular or substantially perpendicular to the horizontal plane. The conveying pipe (6) is movably arranged on the mobile chassis (1) along the second axis. The pipe wall of the conveying pipe (6) is provided with a first outlet (601) and a second inlet (602). The first outlet (601) and the second inlet (602) are spaced apart in the circumferential and axial directions of the second axis. The ramming device (7) includes a transverse platform (701) movably mounted on the mobile chassis (1), a winch (702) mounted on the transverse platform (701), and a counterweight (703) connected to the winch (702) by a cable. The in-situ drilling, filling and compaction integrated equipment for saline-alkali land has at least a first state and a second state. When the in-situ drilling, filling and compaction equipment for saline-alkali land is in the first state, the first outlet (601) is aligned and connected with the inlet of the first mixing chamber (2), the side wall of the conveying pipe (6) blocks the outlet of the second mixing chamber (3), the side wall of the second mixing chamber (3) blocks the second inlet (602), and the spiral drill rod (5) passes through the middle of the conveying pipe (6). When the in-situ drilling, filling and compaction equipment for saline-alkali land is in the second state, the second inlet (602) is aligned and connected with the outlet of the second mixing chamber (3), the side wall of the conveying pipe (6) blocks the inlet of the first mixing chamber (2), the side wall of the first mixing chamber (2) blocks the first outlet (601), the spiral drill rod (5) is located above the conveying pipe (6) and spaced apart from the upper end of the conveying pipe (6) so that the counterweight (703) is located at the upper end of the conveying pipe (6).

2. The in-situ drilling, relocation, and compaction integrated equipment for saline-alkali land according to claim 1, characterized in that, The conveying pipe (6) includes a pipe body and an elastic collar (603) disposed at the lower end of the pipe body.

3. The in-situ drilling, relocation, and compaction integrated equipment for saline-alkali land according to claim 1, characterized in that, The in-situ drilling, filling and compaction integrated equipment for saline-alkali land also includes a drive mechanism, which is used to control the rotation of the spiral drill rod (5) around the first axis and the movement along the first axis direction; A pivotable drill rod frame (101) is mounted on the mobile chassis (1), and the spiral drill rod (5) and the drive mechanism are mounted on the drill rod frame (101); a hydraulic drive rod (102) is also provided on the mobile chassis (1), and the two ends of the hydraulic drive rod (102) are respectively hinged to the mobile chassis (1) and the drill rod frame (101).

4. The in-situ drilling, relocation, and compaction integrated equipment for saline-alkali land according to claim 3, characterized in that, The drive mechanism includes a first motor (105) and a second motor (107). A guide rod (103) is provided on the drill rod frame (101). A drill rod platform (104) is slidably mounted on the guide rod (103). The first motor (105) and the spiral drill rod (5) are arranged on the drill rod platform (104) to allow the first motor (105) to control the rotation of the spiral drill rod (5). The drill rod frame (101) has a sprocket (106) at each end, and a chain is provided between the two sprockets (106). The second motor (107) drives one of the sprockets (106), and the chain is connected to the drill rod platform (104).

5. The in-situ drilling, relocation, and compaction integrated equipment for saline-alkali land according to claim 3, characterized in that, When the in-situ drilling, filling and compaction equipment for saline-alkali land is in the second state, the spiral drill rod (5) is parallel to the horizontal plane and is spaced apart at the upper end of the conveying pipe (6).

6. The in-situ drilling, relocation, and compaction integrated equipment for saline-alkali land according to claim 1, characterized in that, The mobile chassis (1) is equipped with a feeding system, which is used to add the modifier into the first mixing chamber (2).

7. The in-situ drilling, relocation, and compaction integrated equipment for saline-alkali land according to claim 1, characterized in that, The in-situ drilling, filling and compaction equipment for saline-alkali land also includes a sand and gravel adding device that can be movably installed on the mobile chassis (1). When the in-situ drilling, filling and compaction equipment for saline-alkali land is in the second state, the sand and gravel adding device is allowed to move to the upper end of the conveying pipe (6).

8. A method for treating saline-alkali land, characterized in that, Based on the in-situ drilling, relocation, and compaction integrated equipment for saline-alkali land as described in any one of claims 1-7, the saline-alkali land treatment method includes: The in-situ drilling, filling and compaction equipment for saline-alkali land is controlled to be in the first state. The lower end of the conveying pipe (6) is in contact with the soil surface. The spiral drill rod (5) continuously rotates and drills down to break the soil surface and gradually form a borehole. The broken soil gradually rises to the first outlet (601) through the cooperation of the spiral blades on the spiral drill rod (5) and the conveying pipe (6), and then enters the first mixing chamber (2). The first screw rotates so that the blades on the first screw push the soil, so that it is transported to the second mixing chamber (3) through the soil transport pipe. Then the second screw rotates to further mix and break up the soil, thereby further maturing the soil. When the borehole reaches the predetermined depth, the spiral drill rod (5) stops rotating, and at the same time, the spiral drill rod (5) and the conveying pipe (6) are lifted so that the in-situ drilling, filling and compaction equipment for saline-alkali land switches to the second state. Then, through the rotation of the second spiral rod, the blades on the second spiral rod push the soil in the second mixing chamber (3) and make it enter the conveying pipe (6) through the discharge port of the second mixing chamber (3). Then, under the guidance of gravity and the conveying pipe (6), it is backfilled into the borehole. The traverse platform (701) works with the winch (702) to move the counterweight (703) to the upper end of the conveying pipe (6). Then the winch (702) releases the cable, and the counterweight (703) impacts the backfill soil on the borehole under the guidance of the conveying pipe (6). Then it is lifted and dropped multiple times in the conveying pipe (6) to compact the backfill soil in the borehole.

9. The method for treating saline-alkali land according to claim 8, characterized in that, During the process of the second screw conveying the soil in the second mixing chamber (3) to the conveying pipe (6), the sand and gravel adding device is located at the upper end of the conveying pipe (6) to convey sand and gravel into the conveying pipe (6); As soil continues to fall into the delivery pipe (6), the valve opening of the sand and gravel addition device gradually decreases.

10. The method for treating saline-alkali land according to claim 8, characterized in that, The elastic collar (603) is always in contact with the ground.

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