A device and method for remediating heavy metal contaminated soil

Abstract

The present application relates to a device and method for repairing heavy metal contaminated soil, which belongs to the technical field of ecological restoration. The device comprises a concealed pipe buried in the soil, wherein a plurality of water-permeable strip holes are provided on the concealed pipe, the length direction of the water-permeable strip holes is provided along the length direction of the concealed pipe, and adjacent water-permeable strip holes are provided at intervals along the length direction of the concealed pipe; a frame and a filter material layer are provided on the outer wall of the concealed pipe, the number of frames and filter material layers provided corresponds to the number of water-permeable strip holes provided, a single water-permeable strip hole is located in a single frame, and the filter material layer is located in the frame and covers the corresponding water-permeable strip hole; a pressure strip is hinged on the edge of the frame away from the concealed pipe, and a fixing component for driving the pressure strip to press the edge of the filter material layer is provided outside the concealed pipe; a plurality of concealed pipes are provided, and the ends of adjacent concealed pipes are detachably connected to each other. The present application has the effect of saving time and labor when laying the filter material layer and ensuring the preliminary filtration of the solution.

Description

Technical Field

[0001] The present application relates to the technical field of ecological restoration, and in particular to a device and method for repairing heavy metal contaminated soil. Background Art

[0002] With the rapid development of industry and agriculture, harmful heavy metals have entered the soil, and the area of heavy metal-contaminated soil has continued to expand, destroying the ecological balance of the soil and causing the soil environmental quality to deteriorate.

[0003] The current method of treating heavy metal contaminated soil is leaching, which dissolves, desorbs, chelates or fixes heavy metal pollutants in the soil through the flushing of eluents, transferring heavy metals from the solid phase soil to the liquid phase eluent, thereby repairing the soil.

[0004] The eluent is sprayed onto the soil, and a concealed pipe is buried under the soil for recovering the solution in the soil. The solution here refers to the water that flows back together after the eluent dissolves, desorbs, chelates or fixes the heavy metal pollutants. There are multiple water-permeable holes at intervals on the concealed pipe, with an opening rate of 3.25%-6.5% and an aperture of 3.2mm. The outer wall of the concealed pipe is completely wrapped with a filter material layer with a thickness of 7cm-9cm. The filter material layer is composed of sand and gravel. The solution is collected into the purification tank through the concealed pipe for purification, and is put into use as a new eluent after standing and clarifying.

[0005] Since the filter material layer needs to cover all the water permeable holes to ensure the initial filtration of the solution, during the laying process of the concealed pipe, there is a defect that it is time-consuming and labor-intensive to fully lay the filter material layer on the outer wall of the concealed pipe. Summary of the Invention

[0006] In order to save time and effort when laying the filter material layer and ensure the effect of preliminary filtration of the solution, the present application provides a device and method for repairing heavy metal contaminated soil.

[0007] The present application provides a device for remediating heavy metal contaminated soil using the following technical solutions:

[0008] A device for repairing heavy metal contaminated soil comprises a concealed pipe buried in the soil, wherein a plurality of water-permeable strip holes are provided on the concealed pipe, wherein the length direction of the water-permeable strip holes is provided along the length direction of the concealed pipe, and adjacent water-permeable strip holes are provided at intervals along the length direction of the concealed pipe; a frame and a filter material layer are provided on the outer wall of the concealed pipe, wherein the number of frames and filter material layers provided corresponds to the number of water-permeable strip holes provided, a single water-permeable strip hole is located within a single frame, and the filter material layer is located within the frame and covers the corresponding water-permeable strip hole; a pressure strip is hinged on the edge of the frame away from the concealed pipe, and a fixing component for driving the pressure strip to press the edge of the filter material layer is provided outside the concealed pipe; a plurality of concealed pipes are provided, and the ends of adjacent concealed pipes are detachably connected to each other.

[0009] By adopting the above technical solution, the number of water-permeable holes originally opened on the concealed pipe is reduced by opening water-permeable holes on the concealed pipe. At this time, it is only necessary to cover the water-permeable holes with a filter layer to ensure that the solution is filtered before entering the concealed pipe, replacing the covering method of fully wrapping the outer wall of the concealed pipe. A single filter layer is placed in a corresponding frame, and the frame provides a carrying space for the filter layer. The frame cooperates with the fixing component to conveniently fix the filter layer. The overall amount of filter layer is reduced during the laying of the concealed pipe, which saves time and effort when laying the filter layer, and ensures the initial filtration effect of the solution.

[0010] Optionally, a fixing hole is provided on the pressure strip; the fixing assembly includes a fixing ring, a connecting ring and a fixing rod, one end of the connecting ring is rotatably connected to the fixing ring, the connecting ring and the fixing ring are arranged on the same center line, one end of the fixing rod is hinged to the connecting ring, and the other end is inserted into the fixing hole, the aperture of the fixing hole is larger than the diameter of the fixing rod, and the fixing ring is moved in the direction close to or away from the filter material layer; when the fixing ring moves in the direction close to the filter material layer, the fixing rod pushes the strip plate to rotate in a fan-like shape in the direction close to the filter material layer.

[0011] By adopting the above technical solution, the fixing ring is moved in the direction close to the filter material layer, the fixing ring drives the connecting ring to move, and the connecting ring pushes the fixing rod to rotate the pressure strip in the direction close to the filter material layer, so that the pressure strip presses the edge of the filter material layer, thereby realizing rapid fixation of the filter material layer.

[0012] Optionally, the end of the fixing rod away from the connecting ring is spherical, and the spherical end of the fixing rod is located in the fixing hole and can rotate freely in the fixing hole.

[0013] By adopting the above technical solution, the spherical end of the fixing rod enables the end of the fixing rod to be smoother and fit the pressure strip when the fixing rod and the pressure strip rotate relative to each other, thereby enhancing the stability of the connection between the fixing rod and the pressure strip.

[0014] Optionally, a support assembly is provided in the concealed pipe, the support assembly includes a support rod, an arc plate and a driving rod, the arc plate is fixed to the end of the support rod, the arc concave surface of the arc plate is arranged toward the support rod, the bending curvature of the arc plate is the same as the curvature of the inner wall of the concealed pipe, the sum of the thickness of the arc plate and the length of the support rod is equal to the inner diameter of the concealed pipe, and the length of the permeable strip hole is not less than the inner diameter of the concealed pipe; the support rod and the arc plate are both located inside the concealed pipe, the driving rod is arranged perpendicular to the support rod and one end passes through the filter material layer and the permeable strip hole and is fixedly connected to the middle of the support rod; the fixing ring is sleeved on the outer wall of the driving rod, and the fixing ring is threadedly connected to the driving rod.

[0015] By adopting the above technical solution, the integrity of the concealed pipe is destroyed due to the opening of the permeable strip hole. The setting of the support component enables the support rod and the arc plate to form a support along the diameter direction of the concealed pipe inside the concealed pipe. Rotating the driving rod can adjust the position of the support rod and the arc plate in the concealed pipe. At the same time, due to the existence of the driving rod, a moving path is provided for the movement of the fixed ring. The fixed ring is sleeved on the driving rod and is threadedly connected to the driving rod, realizing the limitation of the fixed ring after movement, making full use of the existence of the driving rod, and maximizing the utilization of structural resources.

[0016] Optionally, two arc-shaped plates are provided on a single support rod and are symmetrically arranged at the end of the support rod. A water-permeable groove is opened on the arc-shaped plate. Along the length direction of the concealed pipe, the water-permeable groove is opened through the side walls on both sides of the arc-shaped plate, and the notch of the water-permeable groove is arranged opposite the inner wall of the concealed pipe.

[0017] By adopting the above technical solution, after the support rod and the curved plate are supported inside the concealed pipe, the solution in the concealed pipe can pass through the curved plate through the water-permeable groove when encountering the curved plate. The presence of the water-permeable groove reduces the obstruction of the curved plate to the flow of the solution, ensuring the smooth flow of the solution in the concealed pipe.

[0018] Optionally, the water permeable hole is located between the angle between the horizontal plane and the vertical plane where the axis of the concealed pipe is located; a positioning hole is opened on the concealed pipe, one end of the positioning hole is connected to the inside of the water permeable strip hole, and the length direction of the positioning hole is set perpendicular to the length direction of the water permeable strip hole. When the driving rod is located in the positioning hole away from one end of the water permeable strip hole, the driving rod is in a horizontal state.

[0019] By adopting the above technical solution, the location of the water permeable hole can better allow the solution in the soil to enter the concealed pipe, and avoids the top of the concealed pipe, reserving a position for the support component to support the concealed pipe. The opening of the positioning hole provides a limited space for the placement of the driving rod, and also calibrates that when the driving rod is located at the end of the positioning hole away from the water permeable strip hole, the support rod is in a vertical state, so that the operator has a clear placement position for the support rod and the curved plate inside the concealed pipe, so that he has a clear idea of it.

[0020] Optionally, the cross-section of the driving rod at the positioning hole is polygonal, and when the driving rod is located in the positioning hole, the outer wall of the driving rod abuts against the inner wall of the positioning hole.

[0021] By adopting the above technical solution, after the driving rod is placed in the positioning hole, the driving rod is restricted by the shape and cannot rotate in the positioning hole, thereby ensuring the stability of the position of the support rod and the arc plate inside the concealed pipe.

[0022] Optionally, a telescopic tube is fixed on the filter material layer, the telescopic tube passes through the filter material layer, the telescopic tube has the performance of changing its own length, and the drive rod passes through the telescopic tube along the length direction of the telescopic tube; a sealing gasket is provided between the drive rod and the telescopic tube.

[0023] By adopting the above technical solution, the presence of the telescopic tube makes it easier for the driving rod to penetrate the filter material layer, and the sealing gasket ensures the sealing between the driving rod and the telescopic tube; the presence of the telescopic tube enables the filling and production personnel of the filter material layer to control the thickness of the filter material layer, and the thickness of the filter material layer can be reflected by adjusting the length of the telescopic tube.

[0024] Optionally, a guide plate is fixed between the frame and the outer wall of the concealed tube, the guide plate is arranged at an angle, and the outer wall of the concealed tube, the outer wall of the frame and the guide plate form a triangle shape.

[0025] By adopting the above technical solution, due to the presence of the frame, a negative angle will be formed between the frame and the outer wall of the concealed tube, causing the solution to accumulate. The presence of the guide plate avoids the situation of water accumulation in the negative angle, and the presence of the guide plate cooperates with the frame and the outer wall of the concealed tube to form a stable triangular structure, thereby improving the pressure-bearing capacity of the frame.

[0026] The present application provides a method for remediating heavy metal contaminated soil using the following technical solutions:

[0027] S1. Concealed pipe laying;

[0028] S2. Place the support assembly at the designated location of the concealed pipe;

[0029] S3, covering the filter material layer on the permeable strip holes and fixing the filter material layer by a fixing component;

[0030] S4, bury the hidden pipes and start circulating leaching of the soil;

[0031] S5. Take soil samples and test the heavy metal content. If it does not meet the heavy metal content standard, continue the cycle leaching. If it meets the heavy metal content standard, stop leaching.

[0032] 1. A single filter material layer replaces the covering method of fully wrapping the outer wall of the concealed pipe. A single filter material layer is placed in the corresponding frame. The frame provides a carrying space for the filter material layer. The frame cooperates with the fixing component to conveniently fix the filter material layer. The overall amount of filter material layer is reduced during the concealed pipe laying process, which saves time and effort when laying the filter material layer, and ensures the initial filtration effect of the solution;

[0033] 2. The setting of the support assembly enables the support rod and the arc plate to form a support along the diameter direction of the concealed pipe inside the concealed pipe. The position of the support rod and the arc plate inside the concealed pipe can be adjusted by rotating the driving rod. At the same time, due to the existence of the driving rod, a moving path is provided for the movement of the fixed ring. The fixed ring is sleeved on the driving rod and is threadedly connected to the driving rod, realizing the limitation of the fixed ring after movement, making full use of the existence of the driving rod, and maximizing the utilization of structural resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1It is a structural diagram of an embodiment of the present application;

[0035] Figure 2 It is a cross-sectional view of the filter material layer structure;

[0036] Figure 3 This is a schematic diagram of the external structure of the concealed pipe behind the hidden filter layer;

[0037] Figure 4 It is a cross-sectional view of the internal structure of the concealed pipe.

[0038] In the figure, 1. concealed pipe; 11. water-permeable strip hole; 12. positioning hole; 13. guide plate; 2. filter material layer; 3. frame; 31. pressure strip; 32. fixing hole; 4. fixing assembly; 41. fixing ring; 42. connecting ring; 43. fixing rod; 5. supporting assembly; 51. supporting rod; 52. arc plate; 53. driving rod; 6. water-permeable groove; 7. telescopic pipe; 71. main pipe; 711. first cap ring; 72. auxiliary pipe; 721. second cap ring; 8. sealing gasket;. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-4 This application is described in further detail.

[0040] The embodiments of the present application disclose a device and method for remediating heavy metal contaminated soil.

[0041] refer to Figure 1 A heavy metal contaminated soil remediation device includes a concealed pipe 1, a purification tank, and a storage tank. The concealed pipe 1 is laid in the soil. The concealed pipe 1 is tilted during the laying process. The tilt slope of the concealed pipe 1 is 0.5‰-0.8‰. Multiple concealed pipes 1 are laid in the soil, and adjacent concealed pipes 1 are laid at intervals. The lower end of the concealed pipe 1 itself is connected to the interior of the purification tank. The solution in all concealed pipes 1 converges to the lower end of the concealed pipe 1 and eventually flows into the purification tank. The purification tank is connected to the storage tank. The solution is purified in the purification tank and then sent to the storage tank for sedimentation and storage. The precipitated solution is re-irrigated on the soil for reuse. Adjacent concealed pipes 1 along the length direction are connected end to end. The connection method can be threaded connection or plug-in connection.

[0042] refer to Figure 2 and Figure 3The concealed pipe 1 is provided with water-permeable strip holes 11 and positioning holes 12. There are multiple water-permeable strip holes 11, and they are all located between the angle between the horizontal plane and the vertical plane where the axis of the concealed pipe 1 is located. The length of the water-permeable strip holes 11 is along the length direction of the concealed pipe 1, and adjacent water-permeable strip holes 11 are spaced apart along the length direction of the concealed pipe 1. The drawings of this embodiment only show the water-permeable strip holes 11 on one side of the concealed pipe 1. The actual water-permeable strip holes 11 are symmetrically arranged on the concealed pipe 1 with respect to the vertical plane where the axis of the concealed pipe 1 is located. The number of positioning holes 12 is the same as that of the water-permeable strip holes 11. The positioning holes 12 are perpendicular to the water-permeable strip holes 11. One end of the positioning hole 12 is connected to the inside of the water-permeable strip hole 11. The positioning hole 12 is located on the side of the water-permeable strip hole 11 that is closer to the horizontal plane where the axis of the concealed pipe 1 is located.

[0043] refer to Figure 1 、 Figure 2 and Figure 3 The concealed pipe 1 is provided with a frame 3, a filter material layer 2, a fixing assembly 4, and a supporting assembly 5. The frame 3 is a rectangular frame in this embodiment. The number of the frame 3 is the same as the number of the water-permeable strip holes 11. A single water-permeable strip hole 11 and a single positioning hole 12 are enclosed within a single frame 3. The frame 3 is fixedly connected to the outer wall of the concealed pipe 1. A pressure strip 31 is hinged on the edge of the frame 3 away from the concealed pipe 1. In this embodiment, since the frame 3 is rectangular, four pressure strips 31 are provided corresponding to the number of sides of the frame 3. The pressure strip 31 is turned toward the inside of the frame 3 away from the edge of the frame 3. A positioning hole 12 is opened on the pressure strip 31, and the positioning hole 12 does not completely penetrate the pressure strip 31.

[0044] refer to Figure 3 A guide plate 13 is provided between the outer wall of the frame 3 and the outer wall of the concealed tube 1. One end of the guide plate 13 is fixedly connected to the outer wall of the frame 3, and the other end is fixedly connected to the outer wall of the concealed tube 1. The guide plate 13 is arranged at an angle, and the outer wall of the concealed tube 1, the outer wall of the frame 3 and the guide plate 13 form a triangle shape.

[0045] refer to Figure 2 The filter material layer 2 is composed of non-woven fabric, sand, and gravel. The non-woven fabric is filled with sand and gravel, thereby filtering the solution in the soil. A telescopic tube 7 is provided on the filter material layer 2. The telescopic tube 7 has the ability to adjust its own length. The telescopic tube 7 includes a main tube 71 and a secondary tube 72. A first cap ring 711 is fixed to one end of the main tube 71, and the other end is inserted into the interior of the secondary tube 72. The main tube 71 and the secondary tube 72 are threadedly connected. A second cap ring 721 is fixed to the end of the secondary tube 72 away from the main tube 71. The first cap ring 711 and the second cap ring 721 clamp the two sides of the non-woven fabric. Adjusting the length of the telescopic tube 7 allows the operator to have a preliminary control over the filling thickness of the filter material layer 2.

[0046] refer to Figure 3 and Figure 4The support assembly 5 includes a support rod 51, a curved plate 52, and a drive rod 53. The curved plate 52 is fixed to the end of the support rod 51, and two curved plates 52 are provided on a single support rod 51. The curved concave surface of the curved plate 52 is arranged toward the support rod 51. The curvature of the curved plate 52 is the same as the curvature of the inner wall of the concealed pipe 1. The curved plate 52 is provided with a water-permeable groove 6, which runs through both side walls of the curved plate 52 in the width direction. When the curved outer wall of the curved plate 52 abuts the inner wall of the concealed pipe 1, the direction of the water-permeable groove 6 is the same as the length direction of the concealed pipe 1. The sum of the thickness of the two curved plates 52 and the length of the support rod 51 is equal to the inner diameter of the concealed pipe 1, and the length of the water-permeable strip hole 11 is not less than the inner diameter of the concealed pipe 1, so that the support rod 51 and the curved plate 52 can penetrate into the interior of the concealed pipe 1 from the water-permeable strip hole 11; the support rod 51 and the curved plate 52 are both located inside the concealed pipe 1, and the driving rod 53 is arranged perpendicular to the support rod 51 and one end passes through the telescopic tube 7 and the water-permeable strip hole 11 and is fixedly connected to the middle of the support rod 51. When the driving rod 53 slides into the positioning hole 12 and slides to the end of the positioning hole 12 away from the water-permeable strip hole 11, the support rod 51 is in the concealed pipe 1. The driving rod 53 is rotated inward to a vertical state. At this time, the driving rod 53 is in a horizontal state. The cross-section of the area where the driving rod 53 is located in the positioning hole 12 is polygonal. The outer wall of the driving rod 53 abuts against the hole wall of the positioning hole 12, which is rectangular in this embodiment, thereby limiting the driving rod 53 horizontally. The driving rod 53 passes through the filter material layer 2, and the filter material layer 2 also limits the driving rod 53. In addition, the cross-section of the driving rod 53 in the positioning hole 12 is polygonal, which limits the rotation of the driving rod 53. Multiple limits ensure the stability of the driving rod 53 after it is placed.

[0047] The driving rod 53 penetrates the filter material layer 2 by penetrating the telescopic tube 7 , and a sealing gasket 8 is provided between the driving rod 53 and the telescopic tube 7 to seal the gap therebetween.

[0048] refer to Figure 3 and Figure 4 The fixing assembly 4 includes a fixing ring 41, a connecting ring 42 and a fixing rod 43. The fixing ring 41 is sleeved on the outer wall of the driving rod 53. The fixing ring 41 is threadedly connected to the driving rod 53. One end of the connecting ring 42 is rotatably connected to the fixing ring 41. The connecting ring 42 and the fixing ring 41 are arranged on the same center line. The connecting ring 42 is also sleeved on the driving rod 53. The connecting ring 42 slides relative to the driving rod 53 along the length direction of the driving rod 53. One end of the fixing rod 43 is hinged to the connecting ring 42, and the other end is spherical and inserted into the fixing hole 32. The aperture of the fixing hole 32 is larger than the diameter of the fixing rod 43. The spherical end of the fixing rod 43 rotates freely in the fixing hole 32; when the fixing ring 41 moves in the direction close to the filter material layer 2, the fixing rod 43 pushes the strip plate to rotate in a fan-like shape in the direction close to the filter material layer 2, and finally presses the edge of the filter material layer 2 tightly.

[0049] The implementation principle of the device and method for repairing heavy metal contaminated soil in the embodiment of the present application is as follows: opening water-permeable strip holes 11 on the concealed pipe 1 reduces the number of water-permeable holes originally opened on the concealed pipe 1. At this time, it is only necessary to cover the filter material layer 2 at the water-permeable strip holes 11 through the fixing component 4 to ensure that the solution is filtered before entering the concealed pipe 1, replacing the covering method of fully wrapping the outer wall of the concealed pipe 1. A single filter material layer 2 is placed in the corresponding frame 3. The frame 3 provides a carrying space for the filter material layer 2. The frame 3 cooperates with the fixing component 4 to conveniently fix the filter material layer 2. The overall amount of filter material layer 2 is reduced during the laying process of the concealed pipe 1, which saves time and effort when laying the filter material layer 2 and ensures the initial filtering effect of the solution.

[0050] A method for remediating heavy metal contaminated soil includes:

[0051] S1. Laying of concealed pipe 1: Dig a trench on the soil, place the concealed pipe 1 therein, and connect the concealed pipes 1 section by section end to end. The end to end connection can be a threaded connection or an insert connection.

[0052] S2. Place the support assembly 5 at the designated position of the concealed pipe 1; place the support rod 51 and the curved plate 52 in the concealed pipe 1, and then place the drive rod 53 in the positioning hole 12;

[0053] S3. Cover the filter material layer 2 on the permeable strip hole 11 and fix the filter material layer 2 with the fixing assembly 4; put the telescopic tube 7 on the driving rod 53, and place the filter material layer 2 in the frame 3. Rotate the fixing ring 41 toward the concealed pipe 1 so that the fixing rod 43 pushes the pressure strip 31 to press the edge of the filter material layer 2 tightly.

[0054] S4, buried pipe 1, and began to cycle the soil;

[0055] S5. Take soil samples and test the heavy metal content. If it does not meet the heavy metal content standard, continue the cycle leaching. If it meets the heavy metal content standard, stop leaching.

[0056] The embodiments of this specific implementation method are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A device for remediating heavy metal contaminated soil, comprising a concealed pipe (1) buried in the soil, characterized in that: The concealed pipe (1) is provided with a plurality of water-permeable strip holes (11), the length direction of the water-permeable strip holes (11) is provided along the length direction of the concealed pipe (1), and adjacent water-permeable strip holes (11) are provided at intervals along the length direction of the concealed pipe (1); the outer wall of the concealed pipe (1) is provided with a frame (3) and a filter material layer (2), the number of the frame (3) and the filter material layer (2) provided corresponds to the number of the water-permeable strip holes (11), a single water-permeable strip hole (11) is located in a single frame (3), and the filter material layer (2) is located in the frame (3) and covers the corresponding water-permeable strip hole (11); a pressure strip (31) is hingedly connected to the edge of the frame (3) away from the concealed pipe (1), and a fixing component (4) for driving the pressure strip (31) to press the edge of the filter material layer (2) is provided outside the concealed pipe (1); the concealed pipe (1) is provided with a plurality of, The ends of adjacent concealed pipes (1) are detachably connected to each other; a fixing hole (32) is provided on the pressure strip (31); the fixing assembly (4) comprises a fixing ring (41), a connecting ring (42) and a fixing rod (43); one end of the connecting ring (42) is rotatably connected to the fixing ring (41); the connecting ring (42) and the fixing ring (41) are arranged on the same center line; one end of the fixing rod (43) is hinged to the connecting ring (42) and the other end is inserted into the fixing hole (32); the aperture of the fixing hole (32) is larger than the diameter of the fixing rod (43); the fixing ring (41) is arranged to move in a direction close to or away from the filter material layer (2); when the fixing ring (41) moves in a direction close to the filter material layer (2), the fixing rod (43) pushes the pressure strip (31) to rotate in a fan-like shape in a direction close to the filter material layer (2); A support assembly (5) is provided in the concealed pipe (1), and the support assembly (5) comprises a support rod (51), an arc-shaped plate (52) and a driving rod (53). The arc-shaped plate (52) is fixed to the end of the support rod (51), and the arc-shaped concave surface of the arc-shaped plate (52) is arranged toward the support rod (51). The curvature of the arc-shaped plate (52) is the same as the curvature of the inner wall of the concealed pipe (1). The sum of the thickness of the arc-shaped plate (52) and the length of the support rod (51) is equal to the inner diameter of the concealed pipe (1), and the length of the water-permeable strip hole (11) is not less than the inner diameter of the concealed pipe (1); the support rod (51) and the arc-shaped plate (52) are both located inside the concealed pipe (1), and the driving rod (53) is arranged perpendicular to the support rod (51), and one end of the driving rod (53) passes through the filter material layer (2) and the water-permeable strip hole (11) and is fixedly connected to the middle part of the support rod (51); The fixed ring (41) is sleeved on the outer wall of the driving rod (53), and the fixed ring (41) is threadedly connected to the driving rod (53); the water-permeable strip hole (11) is located between the angle between the horizontal plane and the vertical plane where the axis of the concealed pipe (1) is located; a positioning hole (12) is opened on the concealed pipe (1), one end of the positioning hole (12) is communicated with the inside of the water-permeable strip hole (11), and the length direction of the positioning hole (12) is perpendicular to the length direction of the water-permeable strip hole (11). When the driving rod (53) is located at the positioning hole (12) away from one end of the water-permeable strip hole (11), the driving rod (53) is in a horizontal state; the cross section of the driving rod (53) at the positioning hole (12) is polygonal, and when the driving rod (53) is located in the positioning hole (12), the outer wall of the driving rod (53) abuts against the inner wall of the positioning hole (12).

2. The heavy metal contaminated soil remediation device according to claim 1, characterized in that: The end of the fixing rod (43) away from the connecting ring (42) is spherical, and the spherical end of the fixing rod (43) is located in the fixing hole (32) and can rotate freely in the fixing hole (32).

3. The heavy metal contaminated soil remediation device according to claim 1, characterized in that: Two arc-shaped plates (52) are provided on a single support rod (51) and are symmetrically arranged at the end of the support rod (51). A water-permeable groove (6) is opened on the arc-shaped plate (52). Along the length direction of the concealed pipe (1), the water-permeable groove (6) is opened through the side walls on both sides of the arc-shaped plate (52), and the notch of the water-permeable groove (6) is arranged opposite to the inner wall of the concealed pipe (1).

4. The device for remediating heavy metal contaminated soil according to claim 1, characterized in that: A telescopic tube (7) is fixed on the filter material layer (2), the telescopic tube (7) penetrates the filter material layer (2), the telescopic tube (7) has the performance of changing its own length, and a driving rod (53) penetrates the telescopic tube (7) along the length direction of the telescopic tube (7); a sealing gasket (8) is provided between the driving rod (53) and the telescopic tube (7).

5. The device for remediating heavy metal contaminated soil according to claim 1, characterized in that: A guide plate (13) is fixed between the frame (3) and the outer wall of the concealed tube (1). The guide plate (13) is arranged obliquely. The outer wall of the concealed tube (1), the outer wall of the frame (3) and the guide plate (13) form a triangle shape.

6. A method for remediating heavy metal contaminated soil, using the heavy metal contaminated soil remediation device according to claim 1, characterized in that: The following steps are involved: S1, laying of concealed pipe (1); S2, placing the support assembly (5) at a designated position of the concealed pipe (1); S3, covering the filter material layer (2) on the water-permeable strip holes (11), and fixing the filter material layer (2) by means of a fixing assembly (4); S4, the hidden pipe (1) is buried and the soil is leached in a circulating manner; S5. Take soil samples and test the heavy metal content. If it does not meet the heavy metal content standard, continue the cycle leaching. If it meets the heavy metal content standard, stop leaching.

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