Permeable reactive barrier construction device for polluted groundwater remediation

Abstract

The invention discloses a permeable reactive barrier construction device for polluted groundwater remediation, and relates to the technical field of polluted groundwater remediation, the permeable reactive barrier construction device comprises a drill bit and a drill rod for driving the drill bit to rotate, and a water jet nozzle for widening a hole wall is arranged on one side of the drill rod. An outer supporting ring is arranged on the outer ring face of the inner supporting ring in a sliding mode, a plurality of rotary pressing mechanisms with the same structure and installation mode are arranged on the outer ring face of the outer supporting ring, and telescopic unfolding mechanisms with the same structure and installation mode are arranged on one sides of the multiple rotary pressing mechanisms. And the plurality of rotary pressing mechanisms are matched with the telescopic unfolding mechanism to support the hole wall excavated by the drill bit and the water jet nozzle. The problems that the construction efficiency is low and the construction period is prolonged due to the fact that excavation and supporting cannot be synchronized and comprehensive coordination of the construction process is lacked are solved.

Description

Technical Field

[0001] This application relates to the field of contaminated groundwater remediation technologies, and particularly to a construction device for permeable reactive barriers used in contaminated groundwater remediation. Background Art

[0002] A permeable reactive barrier is a relatively mature in-situ remediation technology for removing pollutants from groundwater and soil. The PRB technology has the advantages of being able to treat various pollutants in-situ, having good treatment effects, and low operating costs. The PRB technology does not involve the extraction of groundwater and is an in-situ passive system that requires no external power, has universality in pollutant removal, and has little impact on the ecological environment. However, existing construction devices are difficult to achieve efficient hole wall support during actual excavation. Often, excavation and support need to be carried out step by step, and existing devices lack a synchronous linkage mechanism for excavation and support, making it difficult to accurately and quickly carry out support operations according to the excavation depth. At the same time, there is a lack of comprehensive coordination in the construction process, and the connection between each link is not tight, which increases the construction difficulty and cost, resulting in low construction efficiency and extended construction period. Summary of the Invention

[0003] In order to improve the problem of low construction efficiency and extended construction period caused by the inability to synchronize excavation and support and the lack of comprehensive coordination in the construction process, this application provides a construction device for permeable reactive barriers used in contaminated groundwater remediation.

[0004] The construction device for permeable reactive barriers used in contaminated groundwater remediation provided by this application adopts the following technical solutions: A construction device for permeable reactive barriers used in contaminated groundwater remediation includes a drill bit and a drill pipe that drives the drill bit to rotate. A water jet nozzle for widening the hole wall is provided on one side of the drill pipe. It is characterized in that: an inner support ring is clamped and fixed on one side of the drill pipe. An outer support ring is slidably arranged on the outer ring surface of the inner support ring. A plurality of rotation and pressing mechanisms with the same structure and installation method are arranged on the outer ring surface of the outer support ring. A plurality of telescopic unfolding mechanisms with the same structure and installation method are arranged on one side of each of the plurality of rotation and pressing mechanisms. The plurality of rotation and pressing mechanisms and the telescopic unfolding mechanisms cooperate with each other to support the hole wall excavated by the drill bit and the water jet nozzle.

[0005] By adopting the above technical solutions, the drill pipe drives the drill bit and the rotation and pressing mechanisms to operate, so that the rotation and pressing mechanisms and the telescopic unfolding mechanisms cooperate with each other, realizing the integrated operation of excavation and support, improving the construction efficiency, and the cooperation between the mechanisms enables quick hole wall support, enhancing the stability and reliability of the construction process, and thus reducing the construction time.

[0006] Preferably, a semi-gear bar for intermittently driving the rotation and pressing mechanism to operate is fixedly provided on one side of the outer circle of the inner support ring.

[0007] By adopting the above technical solution, the setting of the half-gear bar enables the rotating downward pressing mechanism to operate intermittently, thereby realizing the gradual and orderly pushing of the telescopic expansion mechanism, avoiding the structural damage or inaccurate support problems that may be caused by continuous operation, and improving the service life and support effect of the device.

[0008] Preferably, the rotating downward pressing mechanism includes a first movable seat fixed on the outer ring surface of the outer support ring, wherein a downward pressing plate is fixed in the middle of the inner cavity rotating shaft of the first movable seat, and a worm wheel driving the downward pressing plate to rotate is fixed on the other side of the rotating shaft, a worm is meshed with one side of the worm wheel, and a spur gear meshed with the half gear bar for intermittent transmission is fixed on one side of the worm gear.

[0009] By adopting the above technical solution, the rotating downward pressing mechanism realizes slow and stable downward pressing of the downward pressing plate through the transmission of the worm gear and the spur gear, thereby being able to accurately control the degree of expansion of the telescopic expansion mechanism and ensure the stability and reliability of the support structure.

[0010] Preferably, a plurality of horn grooves with the same structure are formed on a side of the lower pressing plate away from the first movable seat, and the plurality of horn grooves are used for clamping and limiting the telescopic and unfolding mechanism.

[0011] By adopting the above technical solution, the setting of the horn groove enables the lower pressure plate to be clamped and limited with the telescopic deployment mechanism, thereby ensuring the stability and accuracy of the telescopic deployment mechanism during the deployment process and avoiding the problem of poor support effect caused by position offset.

[0012] Preferably, a plurality of lower hanging plates are fixedly provided at the lower part of the outer support ring, and a diagonal support plate for supporting the support slide plate is rotatably provided on one side of the lower hanging plate, and a spring B for pulling and limiting is fixedly provided between the diagonal support plate and the lower hanging plate.

[0013] By adopting the above technical solution, the setting of the lower hanging plate and the diagonal support plate and the pulling and limiting effect of the spring B, the supporting slide plate can remain stable during the support process, avoiding the problem of support structure failure or damage caused by unstable support.

[0014] Preferably, the telescopic and unfolding mechanism includes an inner groove plate slidably arranged on one side of the supporting slide plate, a first connecting rod is rotatably arranged on one side of the inner cavity of the inner groove plate, and a second connecting rod is connected to one side of the first connecting rod for pushing the cross sliding rod to move in the inner cavity of the moving push rod.

[0015] By adopting the above technical solution, through the transmission of the first connecting rod and the second connecting rod, the telescopic unfolding mechanism realizes the movement of the cross slide bar in the inner cavity of the moving push rod, thereby promoting the unfolding of the side support rod and the arc-shaped guard plate, forming a supporting structure for the hole wall, and improving the stability and safety of the construction process.

[0016] Preferably, movable shafts with the same structure and installation method are provided at the joints of the second connecting rod with the first connecting rod and the cross slide bar. Limiting grooves are provided at both ends of the movable shaft located at the joint of the second connecting rod and the first connecting rod in the middle of the inner groove plate. A spring A for auxiliary limiting is provided on one side of several of the movable shafts.

[0017] By adopting the above technical solution, the setting of the movable shaft and the limiting groove and the auxiliary limiting effect of the spring A enable the telescopic unfolding mechanism to remain stable during the unfolding process, avoiding problems such as poor supporting effect or structural damage caused by structural loosening.

[0018] Preferably, a cross chute is provided on one side of the inner cavity of the moving push rod. A plurality of symmetrically arranged side support rods with the same structure are slidably arranged inside the cross chute. A transverse chute is provided on one side of each of the side support rods. A second movable seat is slidably arranged inside each of the transverse chutes. Arc-shaped guard plates for abutting and supporting the hole wall are fixedly provided on the same side of each of the second movable seats and the moving push rod.

[0019] By adopting the above technical solution, the setting of the cross chute and the side support rods and the cooperation of the second movable seats and the arc-shaped guard plates enable the telescopic unfolding mechanism to form a complete supporting structure for the hole wall, improving the supporting effect and the stability of the construction process.

[0020] Preferably, a plurality of symmetrically arranged and identically structured pin blocks are fixedly provided on one side of the drill rod. A plurality of limiting slots are provided on the inner ring of the inner support ring and are inserted and fixed on one side of each of the pin blocks.

[0021] By adopting the above technical solution, the setting of the pin blocks and the limiting slots enables the inner support ring to be firmly clamped on the drill rod, avoiding unstable factors during the construction process caused by loosening, and improving the overall stability and reliability of the device.

[0022] Preferably, a limiting ring is fixedly provided on one side of the outer support ring. A plurality of docking slots for intermittent meshing of the half gear bar and the spur gear are provided on the limiting ring.

[0023] By adopting the above technical solution, the setting of the limiting ring and the docking slots enables the half gear bar and the spur gear to accurately perform intermittent meshing, thereby ensuring the normal operation of the rotary pressing mechanism and the precise unfolding of the telescopic unfolding mechanism.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. By means of the drill pipe driving the rotation of the semi-rack on the inner support ring, driving the intermittent rotation of the spur gear, and then driving the operation of the worm and the worm wheel, the worm wheel drives the lower pressing plate to press down the first connecting rod and the second connecting rod. At this time, the horn groove on the lower pressing plate is clamped and limited with the movable shaft at the end of the inner groove plate. The second connecting rod pushes the cross slide bar to slide in the cross chute of the moving push rod, driving the side support rod and the moving push rod, and prompting the arc-shaped guard plates to be quickly spliced into a circle to form a stable support for the hole wall.

[0025] 2. During backfilling, by replacing the pipeline inside the drill pipe and installing the lower pressing plate reversely, the rotation of the drill pipe drives the lower pressing plate to be clamped with the movable shaft of the inner groove plate, pulling the connecting rod to reset the telescopic unfolding mechanism. As the drill pipe rises, the inner groove plate returns to the support slide plate, and the backfilling and the removal of the mechanism are carried out in an orderly manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the excavation construction of the present application; Figure 2 is a schematic diagram of the excavation support of the present application; Figure 3 is a schematic diagram of the whole of the present application; Figure 4 is a side view of the rotary pressing mechanism and the telescopic unfolding mechanism of the present application; Figure 5 is a schematic diagram of the rotary pressing mechanism of the present application; Figure 6 is a schematic diagram of the telescopic unfolding mechanism of the present application; Figure 7 is a top view of the telescopic unfolding mechanism of the present application; Figure 8 is an exploded view of the rotary pressing mechanism and the telescopic unfolding mechanism of the present application; Figure 9 is a schematic diagram of the overall support after excavation of the present application.

[0027] Reference numerals: 100, drill bit; 101, water jet nozzle; 102, pin block; 103, drill pipe; 104, inner support ring; 105, outer support ring; 106, semi-rack; 107, limit slot; 108, limit ring; 109, docking notch; 200, rotary pressing mechanism; 201, spur gear; 202, worm; 203, worm wheel; 204, lower pressing plate; 205, first movable seat; 206, horn groove; 300. Telescopic expansion mechanism; 301. Inner groove plate; 302. First connecting rod; 303. Second connecting rod; 304. Cross sliding rod; 305. Moving push rod; 306. Side support rod; 307. Arc-shaped guard plate; 308. Spring A; 309. Limit groove; 310. Moving shaft; 311. Cross sliding groove; 312. Horizontal sliding groove; 313. Second movable seat. 400. Lower hanging plate; 401. Diagonal support plate; 402. Support sliding plate; 403. Spring B. Specific implementation mode

[0028] The following combines the attached Figures 1-9 to make a further detailed description of this application.

[0029] The embodiment of this application discloses a construction device for a permeable reactive wall for the remediation of contaminated groundwater.

[0030] Refer to Figures 1-4 , a construction device for a permeable reactive wall for the remediation of contaminated groundwater, including a drill bit 100 detachably installed at the end of a mechanical drill rod 103 such as a rotary drilling rig, so that the drill bit 100 can rotate and excavate within the area where the permeable reactive wall is to be excavated as planned. At one end of the drill rod 103 located at the drill bit 100, there is a high-pressure water jet nozzle 101 for widening the hole wall excavated by the drill bit 100, and the pipeline of the water jet nozzle 101 is located inside the drill rod 103 and is connected by a rotary joint, thus not preventing the drill rod 103 and the drill bit 100 from rotating with the water jet nozzle 101.

[0031] Refer to Figures 1-4 , on the outer ring surface of the drill rod 103 on the side away from the water jet nozzle 101, a number of identically structured pin blocks 102 are fixedly arranged, and the number of pin blocks 102 are symmetrically arranged with each other. On one side of the number of pin blocks 102, they are inserted and fixed with a number of limit slots 107, and the number of limit slots 107 are all opened on the inner ring surface of the inner support ring 104. Thus, when the drill rod 103 rotates, it can drive the inner support ring 104 to rotate synchronously through the interaction between the pin blocks 102 and the limit slots 107. In the middle of the outer ring surface of the inner support ring 104, it slides and is mutually limited with the outer support ring 105 with an inner sliding groove provided in the middle of the inner ring surface through a sliding ring.

[0032] Refer to Figures 1-4On one side surface of the outer support ring 105, a limiting ring 108 with a guiding sliding ring is provided in the middle of the outer and inner circles, and is fixedly connected by welding or bolts. In the middle of the outer ring surface of the limiting ring 108, a number of docking notches 109 with the same structure are provided, and the widths of the number of docking notches 109 are all greater than the diameter of the spur gear 201, so that the teeth of the spur gear 201 can rotate inside it. On one side of the outer ring of the inner support ring 104, a semi-rack 106 is fixedly provided, and the semi-rack 106 and the spur gear 201 can mesh with each other. Therefore, when the semi-rack 106 rotates with the inner support ring 104, it can intermittently mesh with the spur gear 201, thereby driving the spur gear 201 to rotate, and thus driving the entire rotary pressing mechanism 200.

[0033] It should be noted that the drill bit 100, the water jet nozzle 101, and the drill pipe 103 are all prior arts. The middle of the drill pipe 103 is hollow, so that the high-pressure pipeline connected to the water jet nozzle 101 can be arranged inside it, and the water jet nozzle 101 can rotate with the drill pipe 103 through a rotary joint, and at the same time widen the hole wall excavated by the drill bit 100. The drill pipe 103 is not limited to a rotary drilling rig, and can be other machinery that can drive the drill bit 100 to rotate for excavation. The water jet nozzle 101 can be connected to a booster pump together with the high-pressure pipe, and the water treated in the sedimentation tank is used to cut and widen the hole wall. However, since they are all prior arts, their structural principles will not be elaborated here.

[0034] The drill bit 100 detachably installed at the end of the drill pipe 103 of machinery such as a rotary drilling rig rotates and excavates the area where the permeable reaction wall needs to be set and the area with the most serious detected pollution. A high-pressure water jet nozzle 101 is provided at one end of the drill pipe 103 where the drill bit 100 is located, and its pipeline is located inside the drill pipe 103 and is connected through a rotary joint. Therefore, while it rotates with the drill pipe 103 and the drill bit 100, the treated high-pressure water provided by the booster pump and the sedimentation tank or the rainwater tank is used to widen the hole wall excavated by the drill bit 100. On the outer ring surface of the drill pipe 103 on the side away from the water jet nozzle 101, a number of symmetrically arranged pin blocks 102 are fixed. These pin blocks 102 are inserted and fixed with a number of limiting slots 107 provided on the inner ring surface of the inner support ring 104, so that the drill pipe 103 can drive the inner support ring 104 to rotate synchronously when rotating.

[0035] The middle part of the outer ring surface of the inner support ring 104 is slidably and limitedly engaged with the inner chute provided in the middle part of the inner ring surface of the outer support ring 105 through a sliding ring. On one side surface of the outer support ring 105, a limiting ring 108 is fixedly connected between the outer and inner middle parts by welding or bolts. In the middle part of the outer ring surface of the limiting ring 108, a number of docking notches 109 with a width greater than the diameter of the spur gear 201 are provided, so that the spur gear 201 can rotate therein. On one side of the outer ring of the inner support ring 104, a half rack 106 is fixed. When the half rack 106 rotates with the inner support ring 104, it can intermittently engage with the spur gear 201, thereby driving the spur gear 201 to rotate, and further realizing the driving of the entire rotary pressing mechanism 200.

[0036] Refer to Figures 3-5 、 Figure 8 On the outer ring surface of the outer support ring 105, a number of rotary pressing mechanisms 200 are provided. The several rotary pressing mechanisms 200 are spaced apart and symmetric with each other, and their structures and installation methods are the same. The rotary pressing mechanism 200 includes a first movable seat 205 fixedly arranged on the outer ring surface of the outer support ring 105. One end of the lower pressing plate 204 is fixedly connected to the first movable seat 205 through a rotating shaft provided in the middle of its inner cavity. One side of the rotating shaft in the first movable seat 205 penetrates through one side wall of the first movable seat 205 and is fixedly connected to the middle part of a worm gear 203 rotatably arranged on one side of the first movable seat 205. Thus, when the worm gear 203 rotates, it can drive the lower pressing plate 204 to rotate synchronously.

[0037] Refer to Figures 3-5 、 Figure 8 On one side of the worm gear 203, it is meshed with a worm 202 rotatably arranged on one side of the first movable seat 205. One end of the worm 202 is fixedly connected to the middle part of the spur gear 201. One side of the spur gear 201 is inserted into the docking notch 109 provided on the limiting ring 108, so as to achieve intermittent meshing with the half rack 106, thereby driving the worm 202 and the worm gear 203 to rotate intermittently, and slowly driving one end of the lower pressing plate 204 to rotate, so that the suspended end of the lower pressing plate 204 slowly descends around the rotating shaft of the first movable seat 205. On the bottom of the suspended side of the lower pressing plate 204 away from the first movable seat 205, a number of spaced trumpet-shaped grooves 206 are provided. The several trumpet-shaped grooves 206 are symmetric with each other and have the same structure. The number of trumpet-shaped grooves 206 is more than two, and it is best to set two. The spacing distance of the trumpet-shaped grooves 206 is the same as the distance between the movable shafts 310 provided at both ends of the first connecting rod 302. Thus, the trumpet-shaped grooves 206 can be clamped with the movable shafts 310.

[0038] As the inner support ring 104 drives the half gear rack 106 to rotate, the half gear rack 106 can mesh with a number of spur gears 201 arranged at intervals in an array under the guiding action of the limit ring 108, and drive the spur gears 201 to rotate intermittently. While the spur gears 201 are rotating, they will drive the worm 202 fixedly arranged in the middle to rotate synchronously. Then, the worm 202 drives the worm gear 203 meshed on one side to rotate. The worm gear 203 drives the lower pressing plate 204, which is also fixedly connected to the rotating shaft inside the first movable seat 205, to rotate synchronously by being fixedly connected to the rotating shaft inside the first movable seat 205. Thus, the suspended end on the other side of the lower pressing plate 204 can perform a pressing action around the rotating shaft of the first movable seat 205. While the suspended end of the lower pressing plate 204 is pressing down, it abuts against the movable shaft 310, and pushes the movable shaft 310 to move during the pressing process, so that the entire telescopic unfolding mechanism 300 operates. At the same time, the horn groove 206 opened at the lower part of the suspended end of the lower pressing plate 204 will gradually engage and limit with the movable shaft 310 during the pressing process of the suspended end of the lower pressing plate 204.

[0039] Refer to Figure 4 , Figure 8 , and lower hanging plates 400 are fixedly arranged on the lower surfaces of a number of outer support rings 105. And on one side of the lower hanging plates 400 away from the outer support rings 105, inclined support plates 401 are rotatably arranged. And on the other end of the inclined support plates 401, support sliding plates 402 are rotatably arranged. The upper part of the support sliding plates 402 is slidably arranged with the inner groove plate 301 in the telescopic unfolding mechanism 300. Thus, the support sliding plates 402 support the inner groove plate 301 through the interaction between the lower hanging plates 400 and the inclined support plates 401. One end of a spring B403 is fixedly connected to the side surface of the inclined support plates 401 located on one side of the support sliding plates 402, and the other end of the spring B403 away from the inclined support plates 401 is fixedly connected to the side surface of the lower hanging plates 400 located at one end of the outer support rings 105. Thus, the spring B403 plays a role of pulling and limiting each other between the lower hanging plates 400 and the inclined support plates 401, so as to limit the turning angle of the inclined support plates 401 driving the support sliding plates 402.

[0040] Refer to Figures 6-8, and a plurality of telescopic unfolding mechanisms 300 are arranged on one side of a plurality of rotating pressing mechanisms 200, and the structures and installation methods of the plurality of telescopic unfolding mechanisms 300 are the same, and the telescopic unfolding mechanism 300 includes an inner groove plate 301 slidably arranged on one side of the upper end surface of the supporting slide plate 402, and the inner cavity of the inner groove plate 301 is located on one side of the pressing plate 204 and is rotatably connected with one end of the first connecting rod 302 through a movable shaft 310, and one end of the movable shaft 310 protrudes from the side wall of the inner groove plate 301 and the horn groove 2 opened on the pressing plate 204 06, and the other end of the first connecting rod 302 is rotatably connected with the second connecting rod 303 through a movable shaft 310 with the same structure, and the two ends of the movable shaft 310 are mutually clamped with the limiting grooves 309 provided on the movable shaft 310, so that the first connecting rod 302 and the second connecting rod 303 can be limited when they are on the same horizontal line, and a cross slide bar 304 is rotatably provided at one end of the second connecting rod 303 away from the first connecting rod 302, and the second connecting rod 303 and the cross slide bar 304 are also connected by the movable shaft 310.

[0041] Reference Figure 6 , and one side of the movable shaft 310 located at the junction of the first connecting rod 302 and the inner groove plate 301 is rotationally connected to one end of the spring A308, and the other end of the spring A308 is also rotationally connected to the movable shaft 310 located at the junction of the cross slide bar 304 and the second connecting rod 303. When the first connecting rod 302 and the second connecting rod 303 are folded and contracted, the end of the first connecting rod 302 and the inner groove plate 301 and the end of the cross slide bar 304 are pulled in under the tension of the spring A308, and when the first connecting rod 302 and the second connecting rod 303 are located on the same horizontal plane of the cross slide bar 304, the tension force is used to make the first connecting rod 302 and the second connecting rod 303 resist each other to achieve limiting, and can be further stabilized under the action of the limiting groove 309.

[0042] Reference Figures 6-8 , and the side of the cross slide bar 304 away from the second connecting rod 303 is slidably arranged with the cross slide groove 311 opened on the side of the inner cavity of the moving push rod 305, and the surfaces of the cross slide bar 304 and the moving push rod 305 are set to be smooth surfaces, thereby increasing the sliding effect while reducing the loss caused by friction, and the end of the moving push rod 305 away from the cross slide bar 304 is fixedly connected to the middle surface of one of the several arc-shaped guard plates 307, and then when the cross slide bar 304 pushes the moving push rod 305 to move horizontally under the action of the supporting slide plate 402, it will drive the arc-shaped guard plate 307 to move horizontally together.

[0043] Reference Figures 6-8, and two side support rods 306 with the same structure are slidably arranged in the inner cavity on one side of the arc-shaped guard plate 307 where the moving push rod 305 is located. The connection part of the two side support rods 306 can be folded at an angle of 90 - 180 degrees, and is rotatably connected to the cross slide rod 304 at the transfer point, so that the cross slide rod 304 can drive the side support rods 306 to reciprocate. On the side of the two side support rods 306 away from the cross chute 311, two cross chutes 312 with the same structure are provided. The inner cavities of the two cross chutes 312 are set to have a smooth surface. At the same time, two second movable seats 313 with the same structure are slidably arranged in the two cross chutes 312, and the two second movable seats 313 are respectively fixedly connected to the middle parts of the one-side surfaces of two of the several arc-shaped guard plates 307. The maximum length when the two side support rods 306 are unfolded is consistent with the edges on both sides after the arc-shaped guard plate 307 fixedly connected to the moving push rod 305 and the arc-shaped guard plates 307 fixedly connected to the two second movable seats 313 are spliced, that is, the sides of the two side support rods 306 can both abut against the sides of the spliced arc-shaped guard plate 307, and then cooperate with structures such as the cross slide rod 304 to achieve a further limiting effect.

[0044] Refer to Figures 6-8 , and the length of the cross chute 312 is set according to the moving distance required by the second movable seat 313 when the three spliced arc-shaped guard plates 307 are sequentially disassembled, to prevent the arc-shaped guard plate 307 from not being able to be disassembled. Since the two sides of the arc-shaped guard plate 307 are abutted by the side support rods 306 during disassembly, the arc-shaped guard plate 307 in the middle will first move inward under the drive of the moving push rod 305, and then the arc-shaped guard plates 307 on both sides will contract inward under the drive of the side support rods 306. The two side support rods 306 will abut against the two side walls of the middle arc-shaped guard plate 307. Therefore, the length of the moving push rod 305 needs to be reasonably set according to this situation.

[0045] It should be noted that the value of the spring A308 needs to satisfy the limitation of the first connecting rod 302 and the second connecting rod 303, and at the same time, it also needs to satisfy that the lower pressing plate 204 can push the first connecting rod 302 and the second connecting rod 303 to move inward to the groove plate 301 until they are at the same horizontal level. However, since it is an existing technology, its structural principle will not be elaborated here too much.

[0046] In a normal state, the lower end of the lower pressing plate 204 is provided with a plurality of speaker grooves 206, wherein the speaker groove 206 located on one side of the first movable seat 205 is engaged with the movable shaft 310 at one end of the transition between the first connecting rod 302 and the inner groove plate 301, and then cooperates with the supporting slide plate 402 and the diagonal support plate 401 to support and fix the entire telescopic unfolding mechanism 300. At the same time, the lower pressing plate 204 will abut against the movable shaft 310 at the transition between the folded first connecting rod 302 and the second connecting rod 303 during the pressing process, thereby pushing the first connecting rod 302 and the second connecting rod 303 to move the first connecting rod 302 and the second connecting rod 303. A connecting rod 302 is unfolded with the first connecting rod 302 and abuts against the bottom surface of the inner cavity of the inner groove plate 301. At the same time, the second connecting rod 303 and the first connecting rod 302 are unfolded because the other end of the first connecting rod 302 is abutted and limited by the horn groove 206 opened in the lower pressure plate 204. Therefore, when the second connecting rod 303 and the first connecting rod 302 are unfolded, the other end of the second connecting rod 303 will push the cross sliding rod 304 to move, thereby causing the cross sliding rod 304 to push the side support rod 306 connected to it to unfold.

[0047] When the side support rod 306 is unfolded, the second movable seat 313 and the arc-shaped guard plate 307 fixed to the second movable seat 313 will be pushed to move in the oblique direction on both sides through the cross slide groove 312. When the cross slide rod 304 pushes the side support rod 306 to move in the cross slide groove 311 until it contacts the inner cavity side wall of the movable push rod 305, it will push the movable push rod 305 to move horizontally, and at the same time drive the arc-shaped guard plate 307 fixed to the movable push rod 305 to move together, thereby making the arc-shaped guard plate 307 fixed to the second movable seat 313 307 can be spliced with the arc-shaped guard plate 307 fixedly connected to the movable push rod 305, and then a circular support is formed by a plurality of arc-shaped guard plates 307, one side of which can support the hole wall excavated by the drill bit 100 and the water jet nozzle 101, and the two ends of a plurality of side support rods 306 are abutted against the side edges of the plurality of arc-shaped guard plates 307, and the end faces of both ends of the side support rods 306 are set as inclined surfaces inclined to both sides, so that the plurality of side support rods 306 can abut against each other head to tail, thereby further supporting and fixing the circle formed by the plurality of arc-shaped guard plates 307.

[0048] The lower hanging plate 400, the inclined support plate 401, the support sliding plate 402, and the spring B403 cooperate with each other to form a stable triangular support, and the spring B403 is selected to meet the numerical value of this triangular support. Then, after the telescopic expansion mechanism 300 completes the support for the hole wall, the lower hanging plate 400, the inclined support plate 401, the support sliding plate 402, and the spring B403 can follow the drill bit 100 downward to continue excavation together with the outer support ring 105. Under the action of the spring B403, the inclined support plate 401 and the support sliding plate 402 are slowly pulled back and separated from the inner groove plate 301. Moreover, the retraction distance of the inclined support plate 401 and the support sliding plate 402 is greater than the distance between the end of the inner groove plate 301 and the arc-shaped guard plate 307. Thus, when the drill bit 100 excavates to the depth where the next support can be carried out, during the process of returning to the ground, the support sliding plate 402 and the inclined support plate 401 will not touch the telescopic expansion mechanism 300 that has completed the support.

[0049] The implementation principle of the permeable reactive wall construction device for groundwater pollution remediation in the embodiments of this application is as follows: First, according to the determined distribution range of groundwater pollution from the investigation results, the plot within the construction scope is leveled and surveyed and set out, and the central position for setting the permeable reactive wall is fixed. At the same time, according to the horizontal distribution range of groundwater pollution, with the most severely polluted place as the center, a circular foundation pit with a diameter of 10 - 15 m and a depth of 1.5 - 2 m is excavated. Then, the drill bit 100 is calibrated with the center of the circle by a rotary drilling rig. Before excavation, the drill bit 100 is removed, the inner support ring 104 and the outer support ring 105 are inserted onto the drill pipe 103, and fixed and limited through the pin block 102 and the limit slot 107. Then, the drill bit 100 is reinstalled, and the drill bit 100 is driven to rotate through the drill pipe 103, and then excavation is carried out downward. At the same time, the treated water from the sedimentation tank, etc. is transported to the water jet nozzle 101 through the high-pressure water pipe inside the drill pipe 103 by a high-pressure water pump, so as to widen the hole wall excavated by the drill bit 100.

[0050] When the drill bit 100 advances to a certain depth and hole wall support is required, the widening of the hole wall by the water jet nozzle 101 is stopped, and then the drill bit 100 continues to advance downward until the connection between the lower hanging plate 400 and the inclined support plate 401 contacts and abuts against the un-widened soil surface. Then, the drill bit 100 is withdrawn. Then, the inner groove plate 301 in several telescopic expansion mechanisms 300 is placed on the support sliding plate 402. Then, the horn-shaped groove 206 on the lower pressing plate 204 on one side of the first movable seat 205 is clamped and fixed with the movable shaft 310 at the end of the inner groove plate 301. Since there are certain protrusions on both sides of the upper part of the support sliding plate 402, the telescopic expansion mechanism 300 can be prevented from moving to both sides, thereby strengthening the fixing effect on the telescopic expansion mechanism 300.

[0051] Then, the drill bit 100 is inserted into the hole again, and the telescopic expansion mechanism 300 is aligned with the position to be supported. At this time, the junction of the lower hanging plate 400 and the inclined support plate 401 is in contact with the unwidened soil surface, and then the drill rod 103 drives the half gear bar 106 fixed on the inner support ring 104 to rotate, thereby driving a number of spur gears 201 to rotate intermittently, and the spur gear 201 drives the worm 202 and the worm wheel 203 to rotate, and at the same time, the worm wheel 203 drives the lower pressure plate 204 to slowly press down the first connecting rod 302 and the second connecting rod 303, and through the horn groove 206 located on one side of the first movable seat 205 and the end of the inner groove plate 301 The movable shafts 310 are mutually engaged and limited, so that the second connecting rod 303 will push the cross slide bar 304 to move in the cross slide groove 311 set in the inner cavity of the moving push rod 305 during the movement, and the cross slide bar 304 will push the side support rod 306 and the moving push rod 305 to move during the movement, so that the moving push rod 305 and the side support rod 306 respectively push the corresponding arc guard plate 307 to move, so that several arc guard plates 307 can be spliced into a circle to support the hole wall, and several side support rods 306 abut against each other to further form a fixed support for the support circle formed by the arc guard plate 307.

[0052] After the support is completed, the water jet nozzle 101 is turned on to continue to dig a hole downward, while the drill bit 100 continues to dig downward. At this time, the supporting slide plate 402 gradually separates from the inner groove plate 301 as it moves downward, and moves closer to the lower hanging plate 400 under the action of the spring B403. When the drill bit 100 advances to the point where it needs to be supported again, it will not contact the telescopic expansion mechanism 300 during the process of following the drill bit 100 to rise, thereby avoiding damaging the support of the telescopic expansion mechanism 300.

[0053] When the depth of the drill bit 100 meets the set depth of the permeable reaction wall, the drill bit 100 and the water jet nozzle 101 are removed from the drill pipe 103, and the high-pressure pipe inside the drill pipe 103 is replaced with a pipe capable of backfilling the mixture of the composite slow-release functional material and quartz sand. The lower pressing plate 204 is reversely installed on the first movable seat 205, and then the drill pipe 103 is extended into the bottom of the pit for backfilling. The drill pipe 103 is rotated to expand the lower pressing plate 204 in the rotary pressing mechanism 200 so that it can be clamped with the movable shaft 310 on the inner groove plate 301 in the telescopic expansion mechanism 300. Then, the second connecting rod 303 and the first connecting rod 302 are pulled upward, and other structures in the telescopic expansion mechanism 300 are reset. At this time, the inner groove plate 301 moves backward and moves onto the support sliding plate 402. Then, as the drill pipe 103 is lifted out, when the backfill of the mixture of the composite slow-release functional material and quartz sand approaches the bottom of the next telescopic expansion mechanism 300, the drill pipe 103 is withdrawn, and the taken-out telescopic expansion mechanism 300 is removed. Then, the above operations are performed again. Finally, all the telescopic expansion mechanisms 300 are removed in sequence, and the backfill of the permeable reaction wall is completed.

[0054] Finally, the mixture of the composite slow-release functional material and quartz sand, the gravel layer, the permeable non-woven fabric, and the clay are backfilled in sequence in a circular foundation pit with a diameter of 10 - 15 m and a depth of 1.5 - 2 m dug in advance. And clonal willows and alfalfa can be planted in the clay layer, and the plant roots enter the permeable reaction wall material to achieve the collaborative repair of contaminated soil and groundwater.

[0055] The above are only optional embodiments of the present disclosure and are not used to limit the present disclosure. For those skilled in the art, various changes and modifications can be made to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A construction device for a permeable reactive wall for contaminated groundwater remediation, comprising a drill bit (100) and a drill pipe (103) that drives the drill bit (100) to rotate. A water jet nozzle (101) for widening the hole wall is provided on one side of the drill pipe (103), and it is characterized in that: On one side of the drill pipe (103), an inner support ring (104) is clamped and fixed. An outer support ring (105) is slidably arranged on the outer ring surface of the inner support ring (104). A number of rotation and downward pressure mechanisms (200) with the same structure and installation method are arranged on the outer ring surface of the outer support ring (105). On one side of a number of the rotation and downward pressure mechanisms (200), a telescopic unfolding mechanism (300) with the same structure and installation method is arranged. A number of the rotation and downward pressure mechanisms (200) and the telescopic unfolding mechanism (300) cooperate with each other to support the hole wall excavated by the drill bit (100) and the water jet nozzle (101).

2. The construction device for a permeable reactive barrier for contaminated groundwater remediation according to claim 1, characterized in that: On one side of the outer circle of the inner support ring (104), a semi-gear bar (106) for intermittently driving the rotation and downward pressure mechanism (200) to operate is fixedly arranged.

3. The construction device for a permeable reactive barrier for contaminated groundwater remediation according to claim 1, characterized in that: The rotation and downward pressure mechanism (200) includes a first movable seat (205) fixedly arranged on the outer ring surface of the outer support ring (105). In the middle of the rotating shaft in the inner cavity of the first movable seat (205), a lower pressing plate (204) is fixedly arranged. On the other side of the rotating shaft, a worm gear (203) for driving the lower pressing plate (204) to rotate and press downward is fixedly arranged. A worm (202) is meshed on one side of the worm gear (203). On one side of the worm (202), a straight gear (201) meshed with the semi-gear bar (106) for intermittent transmission is fixedly arranged.

4. The construction device for a permeable reactive wall for contaminated groundwater remediation according to claim 3, wherein: On the side of the lower pressing plate (204) far from the first movable seat (205), a number of trumpet grooves (206) with the same structure are opened. A number of the trumpet grooves (206) are used for clamping and limiting the telescopic unfolding mechanism (300).

5. The construction device for a permeable reactive wall for contaminated groundwater remediation according to claim 1, characterized in that: A number of lower hanging plates (400) are fixedly arranged at the lower part of the outer support ring (105). On one side of the lower hanging plate (400), an inclined support plate (401) for supporting a support sliding plate (402) is rotatably arranged. A spring B (403) for tensioning and limiting is fixedly arranged between the inclined support plate (401) and the lower hanging plate (400).

6. The construction device for a permeable reactive barrier for contaminated groundwater remediation according to claim 1, characterized in that: The telescopic unfolding mechanism (300) includes an inner groove plate (301) slidably arranged on one side of the support sliding plate (402). On one side of the inner cavity of the inner groove plate (301), a first connecting rod (302) is rotatably arranged. On one side of the first connecting rod (302), a second connecting rod (303) for pushing a cross slide rod (304) to move in the inner cavity of a moving push rod (305) is connected.

7. The construction device for a permeable reactive barrier for contaminated groundwater remediation according to claim 6, characterized in that: At the joints where the second connecting rod (303) is connected to the first connecting rod (302) and the cross slide rod (304), movable shafts (310) with the same structure and installation method are arranged. At both ends of the movable shaft (310) at the joint where the second connecting rod (303) is connected to the first connecting rod (302), limit grooves (309) opened in the middle of the inner groove plate (301) are arranged. On the opposite sides of a number of the movable shafts (310), springs A (308) for auxiliary limiting are arranged.

8. The construction device for a permeable reactive barrier for contaminated groundwater remediation according to claim 6, characterized in that: On one side of the inner cavity of the moving push rod (305), a cross-shaped sliding groove (311) is provided. Inside the cross-shaped sliding groove (311), a number of side support rods (306) with the same structure and symmetrically arranged are slidably arranged. On one side of each of the side support rods (306), a horizontal sliding groove (312) is provided. Inside each of the horizontal sliding grooves (312), a second movable seat (313) is slidably arranged. On the same side as the moving push rod (305), each of the second movable seats (313) is fixedly provided with an arc-shaped protection plate (307) for abutting and supporting the hole wall.

9. The construction device for a permeable reactive barrier for contaminated groundwater remediation according to claim 1, characterized in that: On one side of the drill pipe (103), a number of plug blocks (102) that are symmetrically arranged and have the same structure are fixedly provided. On one side of each of the plug blocks (102), a number of limit slots (107) opened in the inner ring of the inner support ring (104) are inserted and fixedly arranged.

10. The construction device for a permeable reactive wall for contaminated groundwater remediation according to claim 1, wherein: On one side of the outer support ring (105), a limit ring (108) is fixedly provided. On the limit ring (108), a number of docking notches (109) for intermittently engaging the semi-rack (106) and the spur gear (201) are provided.

Images