Landfill air pressure monitoring device and method for monitoring air pressure below leachate liquid level

Abstract

The invention discloses a landfill air pressure monitoring device and a monitoring method for air pressure below a leachate liquid level, and relates to the field of underground structures. The air pressure at the bottom of the inner pipe, namely the air pressure at the depth position of the inner pipe in a landfill body, is measured by detecting the water level of the leachate in the landfill and detecting the pressure difference water level in the inner pipe in combination with the pressure difference principle, and the air pressure is detected by combining the water level of the leachate with the pressure difference principle. The leachate can fully permeate in the garbage heap, so that the final detection result can fully reflect the air pressure at a certain depth in the heap, and the air pressure detection range and the detection effect are improved; the inner pipe is driven by the lifting driving assembly to move up and down so as to adjust the depth of the bottom of the inner pipe inserted into the landfill, so that the air pressure at different depth positions in the landfill can be detected, and the air pressure detection range and the detection effect are further improved.

Description

Technical Field

[0001] The present invention belongs to the field of air pressure monitoring equipment, and in particular, relates to an air pressure monitoring device for a landfill and a method for monitoring air pressure below a leachate level. Background Art

[0002] As one of the important ways to dispose of urban waste, the safe operation of landfills is crucial to environmental protection and public safety. The background is as follows: Stability impact: There may be local leachate drainage failure in the garbage pile of the landfill, thus forming a stagnant layer to block the discharge of landfill gas, resulting in liquid-gas blockage where liquid is difficult to flow downward and gas is difficult to flow upward, and then accumulating into high air pressure at the bottom. The high air pressure formed by liquid-gas blockage has an adverse effect on the stability of the garbage pile, and may even cause slope slippage at weak locations on the slope of the pile. Therefore, real-time monitoring of changes in air pressure in the garbage pile of the landfill is crucial to ensure the safe operation of the landfill.

[0003] Monitoring defects: The main purpose of traditional landfill gas collection wells is to analyze the gas composition in the pile and determine the concentration of each component. The resistivity method buries electrode sensors at the monitoring depth of the landfill in advance, and compares the changes in the measured natural potential and apparent resistivity profile characteristics at different times. It is mainly used to monitor the diffusion of leachate and the gas migration process in the garbage pile. However, these technologies do not pay much attention to monitoring the internal air pressure of the landfill. Some landfills use pre-buried plastic shafts, which can monitor the local air pressure in the pile through plastic tubes, but the air pressure monitoring area of ​​this technology is small and cannot fully reflect the air pressure at a certain depth in the pile.‌ The main purpose of the present invention is to fill the gaps and deficiencies in the existing landfill garbage pile air pressure monitoring technology in monitoring the air pressure, and to provide a device that measures the water level through the principle of electromagnetic induction and combines the principle of pressure difference to measure the air pressure in the garbage landfill, so as to solve the above problems. Summary of the invention

[0004] In view of the problems in the related art, the present invention proposes a landfill air pressure monitoring device and a method for monitoring the air pressure below the leachate level to overcome the above technical problems existing in the existing related art.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a landfill gas pressure monitoring device, comprising an outer tube and a leachate water level monitoring tube which are plugged and installed in the landfill, an inner tube extending downward to the ground of the landfill is installed inside the outer tube, an inner tube leachate water level monitoring mechanism is installed inside the inner tube, the top of the inner tube is sealed, and a pressure gauge for monitoring the gas pressure inside the inner tube is installed at the top of the inner tube, and the leachate water level monitoring mechanism is installed inside the leachate water level monitoring tube; A depth adjustment mechanism is also installed inside the outer tube, and the depth adjustment mechanism includes a lifting drive assembly and a rotating assembly. The lifting drive assembly can drive the inner tube to lift and move to adjust the depth of the bottom of the inner tube inserted into the landfill, and the rotating assembly can drive the inner tube to rotate synchronously while the inner tube is lifted and lowered.

[0006] Furthermore, a surface covering film is provided on the surface of the landfill, and a mounting frame is provided on the top surface of the surface covering film. The upper ends of the outer pipe and the leachate water level monitoring pipe are fixedly connected to the mounting frame, and the outer pipe and the leachate water level monitoring pipe pass through the surface covering film, and a clay sealing layer is provided at the connection between the outer pipe, the leachate water level monitoring pipe and the surface covering film.

[0007] Furthermore, an upper sealing plate is fixedly installed at the upper end of the inner part of the outer tube, and a lower sealing plate is fixedly installed at the bottom end of the inner part of the outer tube. Both the upper sealing plate and the lower sealing plate are sealingly and slidingly connected to the inner tube.

[0008] Furthermore, the bottom end of the inner tube is provided with a filtration section and a hollow cone head covering and installed outside the filtration section, the filtration section and the hollow cone head are both provided with filtration holes, and the interior of the hollow cone head is filled with permeable stone; A sealing cover is fixedly installed on the top end of the inner tube, and the pressure gauge is fixedly installed on the top end of the sealing cover.

[0009] Furthermore, the inner tube infiltration water level monitoring mechanism includes an electromagnetic induction instrument, a double-axis motor, a floating magnetic plate and a magnetic sensor. The double-axis motor is fixedly installed on the top surface of the upper sealing plate. Both ends of the double-axis motor are drivingly connected to a winding roller, and a steel ruler cable is wound on the two winding rollers. The electromagnetic induction instrument is fixedly installed on the top surface of the upper sealing plate, and a through hole corresponding to the steel ruler cable 1 is provided on the upper sealing plate, one end of the steel ruler cable 1 is electrically connected to the electromagnetic induction instrument, and the other end of the steel ruler cable 1 extends to the inside of the outer tube through the through hole; The floating magnetic plate is slidably arranged inside the inner tube, the magnetic sensor is arranged on the outer ring of the inner tube, and the two ends of the magnetic sensor are respectively electrically connected to two steel ruler cables.

[0010] Furthermore, a percolation section and a water filter base covering the outside of the percolation section are arranged at the bottom end of the percolation liquid water level monitoring tube, and percolation holes are arranged on the percolation section and the water filter base, and the interior of the water filter base is filled with permeable stones.

[0011] Furthermore, the leachate water level monitoring mechanism includes a water level meter and a motor, which are both fixedly mounted on the top surface of the mounting frame, and the output end of the motor is transmission-connected to a second winding roller, on which a second steel ruler cable is wound, one end of the second steel ruler cable is electrically connected to the water level meter, and the other end of the second steel ruler cable extends to the interior of the leachate water level monitoring pipe and is connected and installed with a detection probe.

[0012] Furthermore, the lifting drive assembly includes multiple lifting hydraulic shafts, and the multiple lifting hydraulic shafts are installed on the inner wall of the upper end of the outer tube in a circular distribution. A lower mounting seat is fixedly installed on the telescopic end of each lifting hydraulic shaft, and a clamping hydraulic shaft is fixedly installed on the inner ring of the lower mounting seat, and a splint is fixedly installed on the telescopic end of the clamping hydraulic shaft.

[0013] Further, the rotating assembly includes a plurality of upper arc guide shafts and a plurality of lower arc guide shafts, the plurality of upper arc guide shafts and the plurality of lower arc guide shafts are all arranged circumferentially and obliquely mounted on the inner wall of the upper end of the outer tube, and the corresponding upper arc guide shafts and lower arc guide shafts are symmetrically distributed up and down, an upper mounting seat is slidably mounted on the upper arc guide shaft, the top end of the lifting hydraulic shaft is fixedly connected to the bottom surface of the upper mounting seat, and the lower mounting seat is slidably mounted on the lower arc guide shaft; The inner wall of the outer tube is provided with a plurality of limit guide grooves corresponding to the upper arc guide shaft and the lower arc guide shaft. One end of the upper mounting seat and the lower mounting seat are fixedly mounted with limit sliders, and the limit sliders are slidably mounted in the corresponding limit guide grooves.

[0014] The present invention also discloses a method for monitoring the air pressure below the leachate water level, and the specific steps are as follows: The inner pipe air pressure is measured by a barometer, the leachate water level inside the inner pipe is measured by an inner pipe percolation water level monitoring mechanism, the leachate water level inside the leachate water level monitoring pipe is measured by a leachate water level monitoring mechanism, and the test results are substituted into the air pressure monitoring formula to calculate the air pressure at the bottom of the inner pipe; The inner tube is driven to move up and down by the lifting drive assembly to adjust the depth of the bottom of the inner tube inserted into the landfill. At the same time, the rotating assembly can drive the inner tube to rotate synchronously to reduce the resistance when the inner tube is lifted and adjusted. The air pressure measurement steps are then repeated to detect the air pressure at different depths in the landfill.

[0015] The present invention has the following beneficial effects: 1. In the present invention, the air pressure at the bottom of the inner tube is measured by detecting the water level of the leachate in the landfill and the pressure difference water level in the inner tube, in combination with the pressure difference principle, that is, the air pressure at the depth of the inner tube in the landfill body of the landfill, and the air pressure is detected by combining the leachate water level with the pressure difference principle. Since the leachate can fully penetrate into the garbage pile, the final detection result can fully reflect the air pressure at a certain depth in the pile, thereby improving the air pressure detection range and detection effect.

[0016] 2. In the present invention, the inner tube is driven to move up and down by a lifting drive assembly to adjust the depth of the bottom of the inner tube inserted into the landfill, so that the air pressure at different depths in the landfill can be detected, further improving the air pressure detection range and detection effect. When the inner tube is raised and lowered, the inner tube can be driven to rotate synchronously by a rotating assembly to reduce the resistance during the lifting and lowering of the inner tube, making the lifting and lowering adjustment of the inner tube more convenient and labor-saving.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, they can also obtain drawings based on these drawings without paying creative work.

[0019] Figure 1 This is one of the three-dimensional structural schematic diagrams of the landfill air pressure monitoring device of the present invention; Figure 2 For the present invention Figure 1 A local enlarged structural schematic diagram; Figure 3 For the present invention Figure 1 A schematic diagram of the local enlarged structure at B; Figure 4 For the present invention Figure 1 A schematic diagram of the local enlarged structure at C; Figure 5 For the present invention Figure 1 A schematic diagram of the local enlarged structure at D; Figure 6 This is the second schematic diagram of the three-dimensional structure of the landfill air pressure monitoring device of the present invention; Figure 7 It is a schematic diagram of the internal structure of the landfill air pressure monitoring device of the present invention; Figure 8 The third schematic diagram of the three-dimensional structure of the landfill air pressure monitoring device of the present invention; Fig. 9For the present invention Figure 8 Schematic diagram of the local enlarged structure at E.

[0020] In the figure: 1. Inner tube; 2. Outer tube; 3. Inner tube percolation water level monitoring mechanism; 31. Winding roller 1; 32. Steel ruler cable 1; 33. Magnetic sensor; 34. Floating magnetic plate; 35. Double-axis motor; 36. Electromagnetic induction instrument; 4. Barometer; 5. Leachate water level monitoring tube; 6. Leachate water level monitoring mechanism; 61. Detection probe; 62. Water level meter; 63. Winding roller 2; 64. Motor; 65. Steel ruler cable 2; 7. Depth adjustment mechanism; 7 1. Upper arc guide shaft; 72. Upper mounting seat; 73. Lifting hydraulic shaft; 74. Clamping plate; 75. Clamping hydraulic shaft; 76. Limiting guide groove; 77. Lower arc guide shaft; 78. Lower mounting seat; 79. Limiting slider; 8. Mounting frame; 9. Surface covering film; 10. Clay sealing layer; 11. Hollow cone head; 12. Sealing cover; 13. Upper sealing plate; 14. Through hole; 15. Permeable stone; 16. Infiltration hole; 17. Water filter base; 18. Lower sealing plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0022] In the description of the present invention, it is necessary to understand that the terms "opening", "upper", "lower", "top", "middle", "inside" and the like indicating orientation or positional relationship are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the invention.

[0023] Embodiment 1

[0024] See also Figure 1As shown, the present invention is a landfill gas pressure monitoring device, comprising an outer tube 2 and a leachate water level monitoring tube 5 which are plugged and installed in the landfill, an inner tube 1 extending downward to the ground of the landfill is installed inside the outer tube 2, an inner tube leachate water level monitoring mechanism 3 is installed inside the inner tube 1, the top of the inner tube 1 is sealed, and a barometer 4 for monitoring the internal gas pressure of the inner tube 1 is installed at the top of the inner tube 1, and a leachate water level monitoring mechanism 6 is installed in the leachate water level monitoring tube 5; a depth adjustment mechanism 7 is also installed inside the outer tube 2, and the depth adjustment mechanism 7 includes a lifting drive assembly and a rotating assembly, the lifting drive assembly can drive the inner tube 1 to move up and down to adjust the depth of the bottom of the inner tube 1 inserted into the landfill, and the rotating assembly can drive the inner tube 1 to rotate synchronously while the inner tube 1 is lifted and lowered; Among them, the pressure difference principle adopted in this application is to sum up the total pressure inside and outside the depth plane measured at the bottom of the inner tube 1, and use the mechanical balance principle that the total pressure inside and outside is constant at this plane to summarize the air pressure monitoring formula of the device as follows: p c =p 0 +γ ω （h 1 -h 2 )+p 1 Where: p c —The air pressure at the depth measured at the bottom of the inner tube (Pa); p 0 —Standard atmospheric pressure (Pa); γ ω —Specific gravity of water (N / m 3 ); h 1 —Leachate water level reading in inner pipe (m); h 2 —Leachate water level reading of garbage pile (m); p 1 —Barometer pressure reading (Pa).

[0025] When the air pressure of the landfill is detected, the air pressure inside the inner tube 1 is measured by the barometer 4. p 1 The leachate level inside the inner tube 1 is measured by the inner tube percolation water level monitoring mechanism 3. h 1The leachate level monitoring mechanism 6 measures the leachate level inside the leachate level monitoring pipe 5 (i.e., the leachate level of the garbage pile). h 2 ), and the test result is substituted into the above air pressure monitoring formula to calculate the air pressure at the bottom of the inner tube 1; Furthermore, the inner tube 1 is driven to move up and down by the lifting drive assembly to adjust the depth of the bottom of the inner tube 1 inserted into the landfill, and the rotating assembly can drive the inner tube 1 to rotate synchronously to reduce the resistance when the inner tube 1 is lifted and lowered, and then the air pressure measurement step is repeated to detect the air pressure at different depths in the landfill; In the present embodiment, the air pressure is detected by combining the leachate water level with the pressure difference principle. Since the leachate can fully penetrate into the garbage pile, the final detection result can fully reflect the air pressure at a certain depth in the pile, thereby improving the air pressure detection range and detection effect; by lifting and moving the inner tube 1, the depth of the bottom of the inner tube 1 inserted into the landfill can be adjusted, so that the air pressure at different depths in the landfill can be detected, further improving the air pressure detection range and detection effect, and the inner tube 1 can rotate synchronously when being lifted and lowered, reducing the resistance of the inner tube 1 when being lifted and lowered, making the lifting and adjustment of the inner tube 1 more convenient and labor-saving.

[0026] Embodiment 2 See also Figure 1 As shown, the difference between this embodiment and the above embodiment is that a surface covering film 9 is provided on the surface of the landfill, two mounting frames 8 are provided on the top surface of the surface covering film 9, the upper ends of the outer tube 2 and the leachate water level monitoring pipe 5 are fixedly connected to the corresponding mounting frames 8, the outer tube 2 and the leachate water level monitoring pipe 5 pass through the surface covering film 9, and a clay sealing layer 10 is provided at the connection between the outer tube 2 and the leachate water level monitoring pipe 5 and the surface covering film 9; By arranging a surface covering film 9 on the surface of the garbage pile in the landfill, the garbage pile can be isolated from the atmosphere to prevent the gas in the garbage pile from entering the atmosphere. At the same time, clay is used to seal the connection between the surface covering film 9 and the outer pipe 2 and the leachate water level monitoring pipe 5, which can further improve the sealing effect of the garbage pile. The setting of the mounting frame 8 can reinforce the top of the outer pipe 2 and the leachate water level monitoring pipe 5, improve the stability of the installation of the outer pipe 2 and the leachate water level monitoring pipe 5 in the garbage pile, and a certain distance (about 10 meters) is set between the two mounting frames 8, so that there is enough distance between the inner pipe 1 and the leachate water level monitoring pipe 5, so as to prevent the gas in the garbage pile at the inner pipe 1 from leaking out of the leachate water level monitoring pipe 5, so as to improve the accuracy of the air pressure monitoring result.

[0027] Embodiment 3 See also Figure 1As shown, the difference between this embodiment and the above embodiment is that an upper sealing plate 13 is fixedly installed at the upper end of the inner part of the outer tube 2, and a lower sealing plate 18 is fixedly installed at the bottom end of the inner part of the outer tube 2, and the upper sealing plate 13 and the lower sealing plate 18 are both sealed and slidably connected with the inner tube 1; Among them, the lower sealing plate 18 is used to seal and protect the bottom of the outer tube 2 to prevent landfill garbage from entering the interior of the outer tube 2, and the upper sealing plate 13 is used to isolate and protect the upper end of the outer tube 2 to prevent external garbage and debris from falling into the interior of the outer tube 2.

[0028] Embodiment 4 See also Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the difference between this embodiment and the above embodiment is that the bottom end of the inner tube 1 is provided with a percolation section and a hollow cone head 11 covering and installed outside the percolation section, the percolation section and the hollow cone head 11 are both provided with percolation holes 16, and the interior of the hollow cone head 11 is filled with permeable stones 15; a sealing cover 12 is fixedly installed at the top end of the inner tube 1, and a barometer 4 is fixedly installed at the top end of the sealing cover 12; Among them, the leachate in the garbage pile can enter the interior of the inner tube 1 through the hollow cone head 11 and the permeable stone 15 inside it, and the hollow cone head 11 can cooperate with the permeable stone 15 to filter the garbage and impurities in the garbage pile to prevent the garbage and impurities from entering the inner tube 1 and clogging the inner tube 1. At the same time, the hollow cone head 11 can improve the drilling effect of the inner tube 1 when the inner tube 1 moves downward for adjustment, making the drilling of the inner tube 1 more labor-saving.

[0029] Embodiment 5 See also Figure 1-Figure 4 , Figure 7-Figure 9 As shown, the difference between this embodiment and the above embodiment is that the inner tube infiltration water level monitoring mechanism 3 includes an electromagnetic induction instrument 36, a double-axis motor 35, a floating magnetic plate 34 and a magnetic sensor 33. The double-axis motor 35 is fixedly installed on the top surface of the upper sealing plate 13, and both ends of the double-axis motor 35 are drivingly connected with a winding roller 31, and a steel ruler cable 32 is wound on the two winding rollers 31; the electromagnetic induction instrument 36 is fixedly installed on the top surface of the upper sealing plate 13, and a through hole 14 corresponding to the steel ruler cable 32 is provided on the upper sealing plate 13, one end of the steel ruler cable 32 is electrically connected to the electromagnetic induction instrument 36, and the other end of the steel ruler cable 32 extends to the inside of the outer tube 2 through the through hole 14; the floating magnetic plate 34 is slidably arranged inside the inner tube 1, the magnetic sensor 33 is arranged on the outer ring of the inner tube 1, and the two ends of the magnetic sensor 33 are respectively electrically connected to the two steel ruler cables 32; Among them, the floating magnetic plate 34 floats on the liquid surface of the leachate inside the inner tube 1. When the water level is detected, the electromagnetic induction instrument 36 is turned on, and then the two winding rollers 31 are driven by the double-axis motor 35 to rotate synchronously to rewind or reversely to unwind, so that the two steel ruler cables 32 cooperate to pull the magnetic sensor 33 upward or downward inside the outer tube 2. When the magnetic sensor 33 passes through the floating magnetic plate 34, a magnetic signal will be detected and the detection information will be transmitted to the electromagnetic induction instrument 36. The electromagnetic induction instrument 36 will make a sound. At this time, the reading at the position of the winding roller 31 on the steel ruler cable 32 minus the installation height of the winding roller 31 is the leachate water level reading inside the inner tube 1. h 1 Thus, through the cooperation of the floating magnetic plate 34, the magnetic sensor 33, the electromagnetic induction instrument 36 and the steel ruler cable 32, the water level of the leachate inside the inner tube 1 which is sealed at the top can be detected conveniently and quickly.

[0030] Embodiment 6 See also Figure 1-Figure 7 As shown, the difference between this embodiment and the above embodiment is that the bottom end of the leachate water level monitoring pipe 5 is provided with a filtration section and a water filter base 17 coated on the outside of the filtration section, the filtration section and the water filter base 17 are both provided with filtration holes 16, and the interior of the water filter base 17 is filled with permeable stones 15; the leachate water level monitoring mechanism 6 includes a water level meter 62 and a motor 64, the water level meter 62 and the motor 64 are both fixedly installed on the top surface of the mounting frame 8, the output end of the motor 64 is transmission-connected to a winding roller 2 63, a steel ruler cable 2 65 is wound on the winding roller 2 63, one end of the steel ruler cable 2 65 is electrically connected to the water level meter 62, and the other end of the steel ruler cable 2 65 extends to the interior of the leachate water level monitoring pipe 5, and is connected and installed with a detection probe 61; Among them, the top of the leachate water level monitoring tube 5 is in an open state, so that the top of the leachate water level monitoring tube 5 is connected to the outside atmosphere, and the leachate in the garbage dump can enter the leachate water level monitoring tube 5 after being filtered through the permeable stone 15 inside the water filter base 17. When it is necessary to detect the water level inside the leachate water level monitoring tube 5, the water level meter 62 is turned on, and the motor 64 drives the winding roller 63 to rotate and unwind, so that the steel ruler cable 65 drives the detection probe 61 to move downward inside the leachate water level monitoring tube 5. When the detection probe 61 moves downward to contact with the liquid surface, the water level meter 62 detects the liquid level information and makes a sound. At this time, the reading at the position of the winding roller 63 on the steel ruler cable 65 minus the installation height of the winding roller 63 (the installation height of the winding roller 63 is the same as the installation height of the winding roller 1 31) is the leachate water level reading of the garbage dump. h 2 .

[0031] Embodiment 7 See also Figure 1 , Figure 2 As shown, the difference between this embodiment and the above embodiment is that the lifting drive assembly includes a plurality of lifting hydraulic shafts 73, which are circumferentially distributed and installed on the inner wall of the upper end of the outer tube 2, and a lower mounting seat 78 is fixedly installed on the telescopic end of each lifting hydraulic shaft 73, and a clamping hydraulic shaft 75 is fixedly installed on the inner ring of the lower mounting seat 78, and a clamping plate 74 is fixedly installed on the telescopic end of the clamping hydraulic shaft 75; When the depth of the inner tube 1 is adjusted, the multiple clamping hydraulic shafts 75 are first extended synchronously so that the multiple clamping hydraulic shafts 75 drive the multiple clamping plates 74 to close synchronously and clamp on the surface of the inner tube 1, and then the multiple lifting hydraulic shafts 73 are driven to extend or contract synchronously so that the lifting hydraulic shafts 73 drive the lower mounting seat 78 to move upward or downward. When the lower mounting seat 78 moves upward or downward, the lower mounting seat 78 drives the inner tube 1 to move upward or downward synchronously through the clamping hydraulic shafts 75 and the clamping plates 74 to adjust the insertion depth of the inner tube 1 in the garbage pile body, thereby facilitating the detection of the air pressure inside the garbage pile body at different depths.

[0032] Furthermore, the rotating assembly includes a plurality of upper arc guide shafts 71 and a plurality of lower arc guide shafts 77, and the plurality of upper arc guide shafts 71 and the plurality of lower arc guide shafts 77 are all arranged in a circumferential manner and are obliquely installed on the inner wall of the upper end of the outer tube 2, and the corresponding upper arc guide shafts 71 and the lower arc guide shafts 77 are symmetrically distributed up and down, and an upper mounting seat 72 is slidably installed on the upper arc guide shaft 71, and the top of the lifting hydraulic shaft 73 is fixedly connected to the bottom surface of the upper mounting seat 72, and the lower mounting seat 78 is slidably installed on the lower arc guide shaft 77; a plurality of limiting guide grooves 76 corresponding to the corresponding upper arc guide shafts 71 and the lower arc guide shafts 77 are arranged on the inner wall of the outer tube 2, and one end of the upper mounting seat 72 and the lower mounting seat 78 are fixedly installed with a limiting slider 79, and the limiting slider 79 is slidably mounted in the corresponding limiting guide groove 76; Among them, when the lifting hydraulic shaft 73 extends or contracts to drive the inner tube 1 to be lifted and lowered, the lifting hydraulic shaft 73 drives the upper mounting seat 72 and the lower mounting seat 78 to slide synchronously along the upper arc guide shaft 71 and the lower arc guide shaft 77 respectively, so that the upper mounting seat 72, the lower mounting seat 78, the upper arc guide shaft 71 and the lower arc guide shaft 77 cooperate to drive the lifting hydraulic shaft 73 to make a circular motion. At the same time, the lifting hydraulic shaft 73 drives the inner tube 1 to rotate synchronously through the lower mounting seat 78, the clamping hydraulic shaft 75 and the clamping plate 74, so that the inner tube 1 can rotate synchronously while being lifted and lowered, so as to reduce the resistance of the inner tube 1 during the lifting and lowering adjustment, making its lifting and lowering adjustment more labor-saving.

[0033] Embodiment 8 This embodiment discloses a method for monitoring the air pressure below the leachate water level, and the specific steps are as follows: The air pressure inside the inner tube 1 is measured by the barometer 4, the leachate water level inside the inner tube 1 is measured by the inner tube percolation water level monitoring mechanism 3, and the leachate water level inside the leachate water level monitoring tube 5 is measured by the leachate water level monitoring mechanism 6. The test results are substituted into the air pressure monitoring formula to calculate the air pressure at the bottom of the inner tube 1; The inner tube 1 is driven to move up and down by the lifting drive assembly to adjust the depth of the bottom of the inner tube 1 inserted into the landfill. At the same time, the rotating assembly can drive the inner tube 1 to rotate synchronously to reduce the resistance when the inner tube 1 is lifted and lowered. Then the air pressure measurement steps are repeated to detect the air pressure at different depths in the landfill.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The preferred embodiments of the invention disclosed above are only used to help explain the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the invention, so that those skilled in the art can understand and use the invention well.

Claims

1. A landfill air pressure monitoring device, comprising an outer tube and a leachate water level monitoring tube plugged and installed in the landfill, characterized in that: An inner pipe extending downward to the landfill is installed inside the outer pipe, an inner pipe seepage water level monitoring mechanism is installed inside the inner pipe, the top of the inner pipe is sealed, and a pressure gauge for monitoring the air pressure inside the inner pipe is installed at the top of the inner pipe, and a leachate water level monitoring mechanism is installed in the leachate water level monitoring pipe; A depth adjustment mechanism is also installed inside the outer tube, and the depth adjustment mechanism includes a lifting drive assembly and a rotating assembly. The lifting drive assembly can drive the inner tube to lift and move to adjust the depth of the bottom of the inner tube inserted into the landfill, and the rotating assembly can drive the inner tube to rotate synchronously while the inner tube is lifted and lowered.

2. A landfill air pressure monitoring device according to claim 1, characterized in that: The surface of the landfill is provided with a surface covering film, the top surface of the surface covering film is provided with a mounting frame, the upper ends of the outer pipe and the leachate water level monitoring pipe are fixedly connected to the mounting frame, the outer pipe and the leachate water level monitoring pipe pass through the surface covering film, and a clay sealing layer is provided at the connection between the outer pipe, the leachate water level monitoring pipe and the surface covering film.

3. A landfill air pressure monitoring device according to claim 1, characterized in that: An upper sealing plate is fixedly installed at the upper end of the inner part of the outer tube, and a lower sealing plate is fixedly installed at the bottom end of the inner part of the outer tube. Both the upper sealing plate and the lower sealing plate are sealingly and slidingly connected with the inner tube.

4. The landfill air pressure monitoring device according to claim 1, characterized in that: The bottom end of the inner tube is provided with a filtration section and a hollow cone head covering and installed outside the filtration section, the filtration section and the hollow cone head are both provided with filtration holes, and the interior of the hollow cone head is filled with permeable stone; A sealing cover is fixedly installed on the top end of the inner tube, and the pressure gauge is fixedly installed on the top end of the sealing cover.

5. The landfill air pressure monitoring device according to claim 3, characterized in that: The inner tube infiltration water level monitoring mechanism includes an electromagnetic induction instrument, a double-axis motor, a floating magnetic plate and a magnetic sensor. The double-axis motor is fixedly installed on the top surface of the upper sealing plate. Both ends of the double-axis motor are connected to a winding roller, and a steel ruler cable is wound on the two winding rollers. The electromagnetic induction instrument is fixedly installed on the top surface of the upper sealing plate, and a through hole corresponding to the steel ruler cable 1 is provided on the upper sealing plate, one end of the steel ruler cable 1 is electrically connected to the electromagnetic induction instrument, and the other end of the steel ruler cable 1 extends to the inside of the outer tube through the through hole; The floating magnetic plate is slidably arranged inside the inner tube, the magnetic sensor is arranged on the outer ring of the inner tube, and the two ends of the magnetic sensor are respectively electrically connected to two steel ruler cables.

6. The landfill air pressure monitoring device according to claim 1, characterized in that: The bottom end of the leachate water level monitoring pipe is provided with a percolation section and a water filter base covering the outside of the percolation section. Both the percolation section and the water filter base are provided with percolation holes, and the interior of the water filter base is filled with permeable stones.

7. A landfill air pressure monitoring device according to claim 2, characterized in that: The leachate water level monitoring mechanism includes a water level meter and a motor, which are both fixedly mounted on the top surface of the mounting frame. The output end of the motor is transmission-connected to a second winding roller, on which a second steel ruler cable is wound. One end of the second steel ruler cable is electrically connected to the water level meter, and the other end of the second steel ruler cable extends to the interior of the leachate water level monitoring pipe and is connected and installed with a detection probe.

8. The landfill air pressure monitoring device according to claim 1, characterized in that: The lifting drive assembly includes multiple lifting hydraulic shafts, which are installed on the inner wall of the upper end of the outer tube in a circumferential distribution. A lower mounting seat is fixedly installed on the telescopic end of each lifting hydraulic shaft, and a clamping hydraulic shaft is fixedly installed on the inner ring of the lower mounting seat. A splint is fixedly installed on the telescopic end of the clamping hydraulic shaft.

9. A landfill air pressure monitoring device according to claim 8, characterized in that: The rotating assembly includes a plurality of upper arc guide shafts and a plurality of lower arc guide shafts, the plurality of upper arc guide shafts and the plurality of lower arc guide shafts are all arranged circumferentially and obliquely mounted on the inner wall of the upper end of the outer tube, and the corresponding upper arc guide shafts and lower arc guide shafts are symmetrically distributed up and down, an upper mounting seat is slidably mounted on the upper arc guide shaft, the top end of the lifting hydraulic shaft is fixedly connected to the bottom surface of the upper mounting seat, and the lower mounting seat is slidably mounted on the lower arc guide shaft; The inner wall of the outer tube is provided with a plurality of limit guide grooves corresponding to the upper arc guide shaft and the lower arc guide shaft. One end of the upper mounting seat and the lower mounting seat are fixedly mounted with limit sliders, and the limit sliders are slidably mounted in the corresponding limit guide grooves.

10. A method for monitoring air pressure below the leachate water level, using the landfill air pressure monitoring device according to any one of claims 1 to 9, characterized in that: The specific steps are as follows: The inner pipe air pressure is measured by a barometer, the leachate water level inside the inner pipe is measured by an inner pipe percolation water level monitoring mechanism, the leachate water level inside the leachate water level monitoring pipe is measured by a leachate water level monitoring mechanism, and the test results are substituted into the air pressure monitoring formula to calculate the air pressure at the bottom of the inner pipe; The inner tube is driven to move up and down by the lifting drive assembly to adjust the depth of the bottom of the inner tube inserted into the landfill. At the same time, the rotating assembly can drive the inner tube to rotate synchronously to reduce the resistance when the inner tube is lifted and adjusted. The air pressure measurement steps are then repeated to detect the air pressure at different depths in the landfill.

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