Landfill Gas Pressure Monitoring Device and Monitoring Method for Gas Pressure Below the Leachate Level

Abstract

The present invention discloses a landfill air pressure monitoring device and a method for monitoring the air pressure below the leachate level, which relates to the field of underground structures. By detecting the leachate level in the landfill and the differential water level in the inner pipe, and combining the principle of pressure difference, the air pressure at the bottom of the inner pipe is measured, that is, the air pressure at the depth where the inner pipe is located in the landfill waste landfill heap. Moreover, by detecting the air pressure based on the leachate level and the principle of pressure difference, since the leachate can fully penetrate in the waste heap, the final detection result can fully reflect the air pressure at a certain depth in the heap, thereby improving the air pressure detection range and detection effect; the inner pipe is driven to move up and down by a lifting drive assembly to adjust the depth of the bottom of the inner pipe inserted into the landfill, so as to detect the air pressure at different depth positions in the landfill, further improving the air pressure detection range and detection effect.

Description

Technical Field

[0001] The present invention belongs to the field of air pressure monitoring devices. Specifically, it particularly relates to a landfill air pressure monitoring device and a method for monitoring the air pressure below the leachate level. Background Art

[0002] As one of the important ways of urban waste treatment, the safe operation of landfills is crucial for environmental protection and public safety. The background is as follows:

[0003] Stability impact: Local leachate in the landfill waste body may not be drained out, thus forming a stagnant water layer that blocks the discharge of landfill gas, resulting in liquid-gas blockage where the liquid is difficult to flow downward and the gas is difficult to flow upward, and then high air pressure accumulates at the bottom. The high air pressure formed by the liquid-gas blockage has an adverse impact on the stability of the waste body, and even causes slope sliding at the weak positions of the landfill slope. Therefore, real-time monitoring of the change in air pressure in the landfill waste body is crucial for ensuring the safe operation of landfills.

[0004] Monitoring defects: The main purpose of traditional landfill gas collection wells is to analyze the gas components in the waste body and measure the concentration of each component. The resistivity method mainly monitors the diffusion of leachate and the migration of gas in the waste body by burying electrode sensors in advance at the monitoring depths in the landfill and comparing the changes in the measured natural potential and apparent resistivity profile characteristics at different times. However, these technologies pay little attention to monitoring the air pressure inside the landfill waste body. Some landfills use pre-buried plastic shafts, and local air pressure in the waste body can be monitored through plastic capillary 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 waste body.

[0005] The main purpose of the present invention is to fill the gap and deficiency in the existing landfill waste body air pressure monitoring technology for monitoring air pressure magnitude, and 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 landfill waste body, so as to solve the above problems. Summary of the Invention

[0006] 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-mentioned technical problems existing in the existing related technologies.

[0007] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0008] 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;

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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;

[0013] 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.

[0014] 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.

[0015] 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;

[0016] 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.

[0017] Further, a leachate filtration section and a water-permeable base covering the outside of the leachate filtration section are provided at the bottom end of the leachate level monitoring pipe. Leachate filtration holes are provided on both the leachate filtration section and the water-permeable base, and water-permeable stones are filled inside the water-permeable base.

[0018] Further, the leachate level monitoring mechanism includes a water level gauge and a motor. Both the water level gauge and the motor are fixedly installed on the top surface of the mounting frame. The output end of the motor is drivingly connected to a second winding roller. A second steel tape cable is wound around the second winding roller. One end of the second steel tape cable is electrically connected to the water level gauge, and the other end of the second steel tape cable extends into the leachate level monitoring pipe and is connected with a detection probe installed thereon.

[0019] Further, the lifting drive assembly includes a plurality of lifting hydraulic shafts. The plurality of lifting hydraulic shafts are circumferentially distributed and installed on the inner wall of the upper end of the outer pipe. A lower mounting seat is fixedly installed on the telescopic end of each lifting hydraulic shaft. A clamping hydraulic shaft is fixedly installed on the inner ring of the lower mounting seat, and a clamping plate is fixedly installed on the telescopic end of the clamping hydraulic shaft.

[0020] 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 circumferentially arranged and inclinedly installed on the inner wall of the upper end of the outer pipe, and the corresponding upper arc guide shafts and lower arc guide shafts are symmetrically distributed up and down. An upper mounting seat is slidably installed 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 installed on the lower arc guide shaft;

[0021] A plurality of limiting guide grooves corresponding to the corresponding upper arc guide shafts and lower arc guide shafts are provided on the inner wall of the outer pipe. A limiting slider is fixedly installed at one end of each of the upper mounting seat and the lower mounting seat, and the limiting slider is slidably clamped in the corresponding limiting guide groove.

[0022] The present invention also discloses a method for monitoring the air pressure below the leachate level, and the specific steps are as follows:

[0023] Measure the air pressure inside the inner pipe through a pressure gauge, measure the leachate level inside the inner pipe through the leachate level monitoring mechanism inside the inner pipe, measure the leachate level inside the leachate level monitoring pipe through the leachate level monitoring mechanism, substitute the detection results into the air pressure monitoring formula, and calculate the air pressure magnitude at the bottom position of the inner pipe;

[0024] Drive the inner pipe to lift and move through the lifting drive assembly to adjust the depth of the bottom of the inner pipe inserted into the landfill. At the same time, the rotating assembly can drive the inner pipe to rotate synchronously to reduce the resistance during the lifting adjustment of the inner pipe, and then repeat the air pressure measurement step to detect the air pressure magnitudes at different depth positions in the landfill.

[0025] The present invention has the following beneficial effects:

[0026] 1. In the present invention, by detecting the water level of the landfill leachate and the differential water level in the inner pipe, and combining the principle of pressure difference to measure the air pressure at the bottom of the inner pipe, that is, the air pressure at the depth position of the inner pipe in the landfill waste landfill heap. Moreover, by combining the water level of the leachate with the principle of pressure difference to detect the air pressure, since the leachate can fully penetrate in the waste heap, the final detection result can fully reflect the air pressure at a certain depth in the heap, thereby improving the air pressure detection range and detection effect.

[0027] 2. In the present invention, the inner pipe is driven to move up and down by the lifting drive assembly to adjust the depth of the bottom of the inner pipe inserted into the landfill, so as to detect the air pressure at different depth positions in the landfill, further improving the air pressure detection range and detection effect. And when the inner pipe is lifted and adjusted, the inner pipe can be driven to rotate synchronously by the rotating assembly to reduce the resistance during the lifting and adjustment of the inner pipe, making the lifting and adjustment of the inner pipe more convenient and labor-saving.

[0028] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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 in the following description are only some embodiments of the invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0030] Figure 1 is one of the three-dimensional structural schematic diagrams of the landfill air pressure monitoring device of the present invention;

[0031] Figure 2 is for the present invention Figure 1 partial enlarged structural schematic diagram of part A;

[0032] Figure 3 is for the present invention Figure 1 partial enlarged structural schematic diagram of part B;

[0033] Figure 4 is for the present invention Figure 1 partial enlarged structural schematic diagram of part C;

[0034] Figure 5 is for the present invention Figure 1 partial enlarged structural schematic diagram of part D;

[0035] Figure 6 is the second three-dimensional structural schematic diagram of the landfill air pressure monitoring device of the present invention;

[0036] Figure 7 It is a schematic internal structure diagram of the landfill air pressure monitoring device of the present invention;

[0037] Figure 8 It is the third three-dimensional structure schematic diagram of the landfill air pressure monitoring device of the present invention;

[0038] Figure 9 For the present invention Figure 8 Partial enlarged structure schematic diagram at position E.

[0039] In the figure: 1, inner tube; 2, outer tube; 3, inner tube leachate water level monitoring mechanism; 31, winding roller 1; 32, steel tape cable 1; 33, magnetic induction sensor; 34, floating magnetic plate; 35, biaxial motor; 36, electromagnetic induction instrument; 4, barometer; 5, leachate water level monitoring pipe; 6, leachate water level monitoring mechanism; 61, detection probe; 62, water level gauge; 63, winding roller 2; 64, motor; 65, steel tape cable 2; 7, depth adjustment mechanism; 71, upper arc guide shaft; 72, upper mounting seat; 73, lifting hydraulic shaft; 74, clamping plate; 75, clamping hydraulic shaft; 76, limit guide groove; 77, lower arc guide shaft; 78, lower mounting seat; 79, limit 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, leaching hole; 17, water filtering base; 18, lower sealing plate. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the invention without making creative efforts belong to the scope of protection of the invention.

[0041] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc. indicating orientation or positional relationships are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the invention.

[0042] Embodiment 1

[0043] Please refer to Figure 1As shown in the figure, the present invention is a landfill air pressure monitoring device, which includes an outer pipe 2 inserted and installed in the landfill and a leachate level monitoring pipe 5. An inner pipe 1 extending downward into the landfill underground is installed inside the outer pipe 2. An inner pipe leachate level monitoring mechanism 3 is installed inside the inner pipe 1. The top end of the inner pipe 1 is sealed, and a barometer 4 for monitoring the air pressure inside the inner pipe 1 is installed at the top end of the inner pipe 1. A leachate level monitoring mechanism 6 is installed inside the leachate level monitoring pipe 5; a depth adjustment mechanism 7 is also installed inside the outer pipe 2. The depth adjustment mechanism 7 includes a lifting drive assembly and a rotating assembly. The lifting drive assembly can drive the inner pipe 1 to lift and move to adjust the depth of the bottom of the inner pipe 1 inserted into the landfill, and the rotating assembly can drive the inner pipe 1 to rotate synchronously while the inner pipe 1 is lifting;

[0044] Among them, the principle of pressure difference adopted in this application is to sum up the total internal and external pressures on the measured depth plane at the bottom of the inner pipe 1 respectively, and use the mechanical balance principle that the total internal and external pressures are equal at this plane to summarize the air pressure monitoring formula of the device as follows:

[0045] p c =p 0 +γ ω （h 1 -h 2 )+p 1

[0046] In the formula:

[0047] p c —Air pressure at the measured depth at the bottom of the inner pipe (Pa);

[0048] p 0 —Standard atmospheric pressure (Pa);

[0049] γ ω —Unit weight of water (N / m 3 )

[0050] h 1 —Inner pipe leachate level reading (m);

[0051] h 2 —Landfill body leachate level reading (m);

[0052] p 1 —Barometer air pressure reading (Pa).

[0053] When detecting the landfill air pressure, the internal air pressure of the inner tube 1 is measured by the pressure gauge 4 p 1 , and the leachate level inside the inner tube 1 is measured by the inner tube leachate level monitoring mechanism 3 h 1 , and the leachate level inside the leachate level monitoring tube 5 is measured by the leachate level monitoring mechanism 6 (i.e., the leachate level of the landfill body h 2 ). Substituting the detection results into the above air pressure monitoring formula, the air pressure magnitude at the bottom position of the inner tube 1 can be calculated;

[0054] 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. At the same time, the rotating assembly can drive the inner tube 1 to rotate synchronously to reduce the resistance during the lifting adjustment of the inner tube 1. Then, repeat the air pressure measurement steps to detect the air pressure magnitudes at different depth positions in the landfill;

[0055] In this embodiment, the air pressure is detected by combining the leachate level with the principle of pressure difference. Since the leachate can fully penetrate in the landfill body, the final detection result can fully reflect the air pressure magnitude at a certain depth in the landfill body, thereby improving the air pressure detection range and detection effect; by moving the inner tube 1 up and down, the depth of the bottom of the inner tube 1 inserted into the landfill can be adjusted, so that the air pressure at different depth positions in the landfill can be detected, further improving the air pressure detection range and detection effect. Moreover, when the inner tube 1 is lifted and adjusted, it can rotate synchronously, reducing the resistance during the lifting adjustment of the inner tube 1, making the lifting adjustment of the inner tube 1 more convenient and labor-saving.

[0056] Embodiment 2

[0057] Please refer to Figure 1 As shown, the difference between this embodiment and the above embodiment is that a surface covering film 9 is provided on the landfill surface. 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 level monitoring tube 5 are fixedly connected to the corresponding mounting frames 8. The outer tube 2 and the leachate level monitoring tube 5 penetrate 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 level monitoring tube 5 and the surface covering film 9;

[0058] By arranging the surface covering film 9 on the surface layer of the landfill waste heap, the waste heap can be isolated from the atmosphere, preventing the gas in the waste heap from entering the atmosphere. At the same time, the connection between the surface covering film 9 and the outer pipe 2 and the leachate level monitoring pipe 5 is sealed with clay, which can further improve the sealing effect of the waste heap. The installation frame 8 can reinforce the tops of the outer pipe 2 and the leachate level monitoring pipe 5, improving the stability of the installation of the outer pipe 2 and the leachate level monitoring pipe 5 in the waste heap. And there is a certain distance (about 10 meters) between the two installation frames 8, so that there is enough distance between the inner pipe 1 and the leachate level monitoring pipe 5, preventing the gas in the waste heap at the inner pipe 1 from leaking out from the leachate level monitoring pipe 5, so as to improve the accuracy of the air pressure monitoring results.

[0059] Embodiment Three

[0060] Please refer to Figure 1 As shown, the difference between this embodiment and the above embodiment is that an upper sealing plate 13 is fixedly installed at the upper end inside the outer pipe 2, and a lower sealing plate 18 is fixedly installed at the bottom end inside the outer pipe 2. Both the upper sealing plate 13 and the lower sealing plate 18 are in sealed sliding connection with the inner pipe 1;

[0061] Among them, the lower sealing plate 18 is used to seal and protect the bottom of the outer pipe 2 to prevent landfill waste from entering the inside of the outer pipe 2, and the upper sealing plate 13 is used to isolate and protect the upper end of the outer pipe 2 to prevent external waste and sundries from falling into the inside of the outer pipe 2.

[0062] Embodiment Four

[0063] Please refer to Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 As shown, the difference between this embodiment and the above embodiment is that a leaching section is provided at the bottom end of the inner pipe 1 and a hollow cone head 11 is coaxially installed outside the leaching section. Leaching holes 16 are provided on both the leaching section and the hollow cone head 11, and permeable stones 15 are filled inside the hollow cone head 11; a sealing cover 12 is fixedly installed at the top end of the inner pipe 1, and the air pressure gauge 4 is fixedly installed at the top end of the sealing cover 12;

[0064] Among them, the leachate in the waste heap can enter the inside of the inner pipe 1 through the hollow cone head 11 and the permeable stones 15 inside it, and the hollow cone head 11 can cooperate with the permeable stones 15 to filter the waste and impurities in the waste heap, preventing the waste and impurities from entering the inside of the inner pipe 1 and blocking the inner pipe 1. At the same time, the hollow cone head 11 can improve the drilling effect of the inner pipe 1 when the inner pipe 1 moves downward for adjustment, making the drilling of the inner pipe 1 more labor-saving.

[0065] Embodiment Five

[0066] Please refer to Figures 1-4 、Figures 7-9 As shown in the figure, the difference between this embodiment and the above-mentioned embodiment is that the inner tube leachate water level monitoring mechanism 3 includes an electromagnetic induction instrument 36, a biaxial motor 35, a floating magnetic plate 34, and a magnetic induction sensor 33. The biaxial motor 35 is fixedly installed on the top surface of the upper sealing plate 13. Both ends of the biaxial motor 35 are drivingly connected with a first winding roller 31, and a first steel tape cable 32 is wound around each of the two first winding rollers 31; The electromagnetic induction instrument 36 is fixedly installed on the top surface of the upper sealing plate 13. A through hole 14 corresponding to the first steel tape cable 32 is provided on the upper sealing plate 13. One end of the first steel tape cable 32 is electrically connected to the electromagnetic induction instrument 36, and the other end of the first steel tape cable 32 extends into the interior of the outer tube 2 through the through hole 14; The floating magnetic plate 34 is slidably arranged inside the inner tube 1, and the magnetic induction sensor 33 is arranged on the outer ring of the inner tube 1, and both ends of the magnetic induction sensor 33 are electrically connected to the two first steel tape cables 32 respectively;

[0067] Among them, the floating magnetic plate 34 floats on the liquid surface of the leachate inside the inner tube 1. During water level detection, the electromagnetic induction instrument 36 is turned on, and then the two first winding rollers 31 are driven by the biaxial motor 35 to rotate synchronously for winding or rotate in the reverse direction for unwinding, so that the two first steel tape cables 32 cooperate to pull the magnetic induction sensor 33 up or down inside the outer tube 2. When the magnetic induction sensor 33 passes by 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 of the first steel tape cable 32 at the position of the first winding roller 31 minus the installation height of the first winding roller 31 is the water level reading of the leachate inside the inner tube 1 h 1 ; Thus, through the cooperation of the floating magnetic plate 34, the magnetic induction sensor 33, the electromagnetic induction instrument 36, and the first steel tape cable 32, the water level of the leachate inside the top-closed inner tube 1 can be detected conveniently and quickly.

[0068] Embodiment Six

[0069] Please refer to Figures 1-7 As shown in the figure, the difference between this embodiment and the above-mentioned embodiment is that the bottom end of the leachate water level monitoring pipe 5 is provided with a leaching section and a water filtering base 17 wrapped outside the leaching section. Leaching holes 16 are provided on both the leaching section and the water filtering base 17. The interior of the water filtering base 17 is filled with permeable stones 15; The leachate water level monitoring mechanism 6 includes a water level gauge 62 and a motor 64. The water level gauge 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 drivingly connected with a second winding roller 63, and a second steel tape cable 65 is wound around the second winding roller 63. One end of the second steel tape cable 65 is electrically connected to the water level gauge 62, and the other end of the second steel tape cable 65 extends into the interior of the leachate water level monitoring pipe 5 and is connected with a detection probe 61 installed;

[0070] Among them, the top end of the leachate level monitoring pipe 5 is in an open state, so that the top end of the leachate level monitoring pipe 5 is communicated with the outside atmosphere. The leachate in the garbage heap can enter the inside of the leachate level monitoring pipe 5 after being filtered by the permeable stone 15 inside the water filtering base 17. When it is necessary to detect the water level inside the leachate level monitoring pipe 5, the water level gauge 62 is turned on, and the winding roller two 63 is driven to rotate and unwind by the motor 64, so that the steel tape cable two 65 drives the detection probe 61 to descend inside the leachate level monitoring pipe 5. When the detection probe 61 descends to contact the liquid surface, the water level gauge 62 detects the liquid surface information and makes a sound. At this time, the reading of the steel tape cable two 65 at the position of the winding roller two 63 minus the installation height of the winding roller two 63 (the installation height of the winding roller two 63 is the same as the installation height of the winding roller one 31) is the reading of the leachate level in the garbage heap body. h 2 。

[0071] Embodiment Seven

[0072] Please refer to 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. The plurality of lifting hydraulic shafts 73 are circumferentially distributed and installed on the inner wall of the upper end of the outer tube 2. A lower mounting seat 78 is fixedly installed on the telescopic end of each lifting hydraulic shaft 73. A clamping hydraulic shaft 75 is fixedly installed on the inner ring of the lower mounting seat 78. A clamping plate 74 is fixedly installed on the telescopic end of the clamping hydraulic shaft 75;

[0073] When adjusting the depth of the inner tube 1, first synchronously extend a plurality of clamping hydraulic shafts 75, so that the plurality of clamping hydraulic shafts 75 drive the plurality of clamping plates 74 to synchronously close and clamp the surface of the inner tube 1. Then drive the plurality of lifting hydraulic shafts 73 to synchronously extend or contract, so that the lifting hydraulic shafts 73 drive the lower mounting seat 78 to move up or down. When the lower mounting seat 78 moves up or down, the lower mounting seat 78 drives the inner tube 1 to move up or down synchronously through the clamping hydraulic shaft 75 and the clamping plate 74, so as to adjust the insertion depth of the inner tube 1 in the garbage heap body, thereby facilitating the detection of the air pressure inside the garbage heap body at different depths.

[0074] Furthermore, the rotating assembly includes a plurality of upper arc guide shafts 71 and a plurality of lower arc guide shafts 77. The plurality of upper arc guide shafts 71 and the plurality of lower arc guide shafts 77 are all arranged in a circular shape and are inclinedly installed on the inner wall of the upper end of the outer tube 2. The corresponding upper arc guide shafts 71 and lower arc guide shafts 77 are symmetrically distributed up and down. An upper mounting seat 72 is slidably installed on the upper arc guide shaft 71. The top end of the lifting hydraulic shaft 73 is fixedly connected to the bottom surface of the upper mounting seat 72. A 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 lower arc guide shafts 77 one by one are arranged on the inner wall of the outer tube 2. One end of each of the upper mounting seat 72 and the lower mounting seat 78 is fixedly installed with a limiting slider 79. The limiting slider 79 is slidably clamped in the corresponding limiting guide groove 76.

[0075] Wherein, when the lifting hydraulic shaft 73 extends or contracts to drive the inner tube 1 to perform lifting adjustment, 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 perform 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 rotates synchronously while performing lifting adjustment, so as to reduce the resistance during the lifting adjustment of the inner tube 1 and make the lifting adjustment more labor-saving.

[0076] Embodiment Eight

[0077] This embodiment discloses a method for monitoring the air pressure below the leachate level, and the specific steps are as follows:

[0078] Measure the air pressure inside the inner tube 1 through the pressure gauge 4, measure the leachate level inside the inner tube 1 through the inner tube leachate level monitoring mechanism 3, measure the leachate level inside the leachate level monitoring tube 5 through the leachate level monitoring mechanism 6, substitute the detection results into the air pressure monitoring formula, and calculate the air pressure magnitude at the bottom position of the inner tube 1.

[0079] Drive the inner tube 1 to move up and down through 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 during the lifting adjustment of the inner tube 1. Then repeat the air pressure measurement step to detect the air pressure magnitudes at different depth positions in the landfill.

[0080] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0081] The preferred embodiments of the invention disclosed above are only used to help illustrate the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the invention, so that those skilled in the art can well understand and utilize the invention.

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; An upper sealing plate is fixedly installed at the upper end of the inner part of the outer tube, and the inner tube percolation 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, and 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.

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: A lower sealing plate is fixedly installed at the bottom end of the inner part of the outer tube, and both the upper sealing plate and the lower sealing plate are sealingly and slidably connected with the inner tube.

4. A 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 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.

6. 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.

7. 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.

8. A landfill air pressure monitoring device according to claim 7, 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.

9. 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 8, 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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