CN111638164A - Device, system and method for detecting geomembrane leakage position by double-electrode method - Google Patents
Device, system and method for detecting geomembrane leakage position by double-electrode method Download PDFInfo
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- CN111638164A CN111638164A CN202010448022.XA CN202010448022A CN111638164A CN 111638164 A CN111638164 A CN 111638164A CN 202010448022 A CN202010448022 A CN 202010448022A CN 111638164 A CN111638164 A CN 111638164A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
Abstract
The invention discloses a device, a system and a method for detecting a geomembrane leakage position by a double-electrode method in the technical field of geomembrane leakage detection, and aims to solve the technical problems that continuous detection data cannot be formed due to the fact that double-electrode method geomembrane leakage detection equipment in the prior art cannot be grounded in real time, detection precision is affected, and operation is inconvenient. The device comprises a cart, wherein a calculation and image output system and a positioning system are arranged on the cart, a measuring device which is rotationally connected with the cart is arranged at the bottom of the cart, the measuring device comprises a roller-shaped measuring device main body, and the cart advances on the geomembrane through the measuring device main body; the measuring device main body is made of flexible conductive materials, and the measuring device main body and the positioning system are respectively and electrically connected with the computing and image output system.
Description
Technical Field
The invention relates to a device, a system and a method for detecting a geomembrane leakage position by a double-electrode method, and belongs to the technical field of geomembrane leakage detection.
Background
The geomembrane is a flexible synthetic material, has good deformation performance and seepage-proofing performance, and is widely applied to seepage-proofing projects such as dikes, cofferdams, dams, reservoirs, refuse landfills and the like. In the actual seepage-proofing engineering, due to the influence of factors such as manufacturing process, construction conditions and the like, the geomembrane is easy to damage, defects of different degrees are formed, the integral seepage-proofing performance of the geomembrane is damaged, and concentrated seepage is easily formed at the defects to cause multiple consequences. Therefore, the geomembrane leakage detection has important significance in the use process of the geomembrane.
At present, mainly adopt bipolar electrode method and squirt method to carry out geomembrane leakage detection, the geomembrane leakage detection equipment of bipolar electrode method that is common in the market has performance defect to a different extent, and the main performance is: the function of outputting images in real time is not available; good grounding cannot be achieved; it is difficult to detect minor anomalies; lack of intuitive parameters to determine the leakage area; the complexity of the operation results in detection accuracy that is susceptible to the skill level of the operator.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a device, a system and a method for detecting the leakage position of a geomembrane by using a double-electrode method, so as to solve the technical problems that continuous detection data cannot be formed due to the fact that double-electrode method geomembrane leakage detection equipment cannot be grounded in real time, detection precision is influenced, and operation is inconvenient.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a double-electrode-method geomembrane leakage position detection device comprises a cart, wherein a calculation and image output system and a positioning system are arranged on the cart, a measuring device in rotary connection with the cart is arranged at the bottom of the cart, the measuring device comprises a roller-shaped measuring device main body, and the cart advances on a geomembrane through the measuring device main body;
the measuring device main body is made of flexible conductive materials, and the measuring device main body and the positioning system are respectively and electrically connected with the computing and image output system.
Furthermore, the measuring device further comprises a shaft rod, a bearing and a conductive sliding ring, the shaft rod is fixedly connected with the bottom of the trolley, the conductive sliding ring is connected with the shaft rod in a rotating mode along the axial direction of the shaft rod through the bearing, and the measuring device main body is fixedly connected with the conductive sliding ring.
Furthermore, the measuring device also comprises a metal sheet fixedly connected with the conducting slip ring along the radial direction of the conducting slip ring and a metal wire fixedly connected with the metal sheet along the radial direction of the conducting slip ring, and the conducting slip ring is clamped with the measuring device main body through the metal sheet or/and the metal wire; the metal sheet comprises a copper sheet, and the metal wire comprises a copper wire.
Furthermore, the cart is also provided with a water tank, and spray nozzles are arranged below the water tank;
the measuring device main part is a geotextile wrapped sponge arranged right below the spray nozzle, and the water in the water tank can spray the spray nozzle onto the geotextile wrapped sponge to form a flexible conductive material.
Further, the cart is also provided with a wire winding device.
In order to achieve the above object, the present invention further provides a system for detecting a geomembrane leakage position by a dual-electrode method, comprising: the invention provides a power supply electrode, a zero potential electrode and a double-electrode geomembrane leakage position detection device;
the power supply electrode is arranged at the edge of the geomembrane measuring area, the anode of the power supply electrode is arranged at the upper part of the geomembrane, and the cathode of the power supply electrode is arranged at the lower part of the geomembrane;
the distance between the zero potential electrode and the geomembrane measuring interval is not less than a preset threshold value, and the zero potential electrode is electrically connected with a calculation and image output system in the double-electrode method geomembrane leakage position detecting device through a lead.
Further, the area of the geomembrane measuring area is not more than 50m multiplied by 50 m.
Further, the thickness of the upper covering layer of the geomembrane measuring area is not more than 60cm, and the power supply voltage applied to the power supply electrode is not lower than 300V.
In order to achieve the above object, the present invention further provides a method for detecting a geomembrane leakage position by a double-electrode method, comprising the following steps:
establishing an electric field in the geomembrane measuring area through a power supply electrode;
driving a double-electrode method geomembrane leakage position detection device to move on a geomembrane detection area, acquiring position information at a moving position through a positioning system, acquiring the geomembrane potential at the moving position through a measurement device, and acquiring a zero potential through a zero potential electrode;
extracting the acquired position information, the geomembrane potential and the zero potential through a calculation and image output system, and calculating the difference between the geomembrane potential and the zero potential to acquire the geomembrane potential difference at the advancing position;
and acquiring the defect position of the geomembrane measuring area based on the position information at the advancing position and the geomembrane potential difference.
Further, the area of the geomembrane measuring area is not more than 50m multiplied by 50m, the thickness of the upper cladding layer of the geomembrane measuring area is not more than 60cm, and the power supply voltage applied to the power supply electrode is not less than 300V.
Compared with the prior art, the invention has the following beneficial effects: the flexible conductive measuring device is arranged at the bottom of the cart, and the cart runs on the geomembrane through the measuring device, so that the device is reliably grounded in real time in the detection process. Based on the system and the method, in the process of driving the device to move on the geomembrane measuring area, the position information of the moving position is obtained through the positioning system, the geomembrane potential of the moving position is obtained through the measuring device, the zero potential is obtained through the zero potential electrode, the obtained data is subjected to operation processing through the calculation and image output system, various processing data can be displayed in real time, and a contour map and a color map of the potential of the measuring area, the potential difference and the difference value of the potential difference along the measuring line direction can be drawn. Because various data are collected in real time, the contour map and the color map which are visual and vivid are generated, the detection precision is greatly improved, and the operation convenience is enhanced.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the apparatus of the present invention;
FIG. 2 is a schematic diagram of a measuring device in an embodiment of the apparatus of the present invention;
FIG. 3 is a schematic view of the internal structure of a measuring device in an embodiment of the apparatus of the present invention;
FIG. 4 is a schematic diagram of the construction of an embodiment of the apparatus of the present invention in which the geotextile wraps the sponge;
fig. 5 is a schematic view of a connection structure between a two-electrode geomembrane leakage position detecting device and a zero-potential electrode in an embodiment of the system of the present invention;
FIG. 6 is a top view of an embodiment of the apparatus of the present invention;
FIG. 7 is a schematic diagram of a computing and image output system according to an embodiment of the present invention.
In the figure: 1. a computing and image output system; 2. pushing a cart; 3. a wire rewinding device; 4. a positioning system; 5. a water tank; 6. a measuring device; 7. a shaft lever; 8. a bearing; 9. a conductive slip ring; 10. the nut is easy to disassemble and assemble; 11. a copper sheet; 12. a copper wire; 13. the geotextile wraps the sponge; 14. a measuring device main body; 15. a wire; 16. a zero potential electrode.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
The specific embodiment of the invention provides a device for detecting the leakage position of a geomembrane by a double-electrode method, as shown in fig. 1 and fig. 6, the device is respectively a schematic diagram of the whole structure and a top view of the embodiment of the device, and comprises a cart 2, wherein the cart 2 is provided with a calculation and image output system 1 and a positioning system 4, the bottom of the cart 2 is provided with a measuring device 6 which is rotatably connected with the cart 2, the measuring device 6 comprises a shaft rod 7, a bearing 8, a conductive sliding ring 9 and a measuring device main body 14, the shaft rod 7 is fixedly connected with the bottom of the cart 2 through an easily-detachable nut 10, the conductive sliding ring 9 is rotatably connected with the shaft rod 7 along the axial direction of the shaft rod through the bearing 8. The measuring device body 14 and the positioning system 4 are electrically connected to the computing and image output system 1, respectively.
More specifically, as shown in fig. 2 and fig. 3, which are a schematic structural diagram and a schematic internal structural diagram of the measuring device in the embodiment of the present invention, the measuring device 6 further includes a metal sheet fixedly connected to the conductive slip ring 9 along the radial direction thereof, and a metal wire fixedly connected to the metal sheet along the radial direction of the conductive slip ring 9, the conductive slip ring 9 is clamped to the measuring device main body 14 through the metal sheet and the metal wire, in this embodiment, the metal sheet is a copper sheet 11, the metal wire is a copper wire 12, the measuring device main body 14 is a rolled geotextile wrapped sponge 13, and the cart 2 can travel on the geomembrane through the rolled geotextile wrapped sponge 13. Still be equipped with water tank 5 on shallow 2, water tank 5 below is equipped with and drenches the mouth, drenches and spouts the mouth and be located geotechnological cloth parcel sponge 13 directly over, and the water in water tank 5 is from drenching and can spray on can geotechnological cloth parcel sponge 13 to make geotechnological cloth parcel sponge 13 form flexible electrically conductive material, can with the geomembrane in close contact with, draw the electric potential information of geomembrane, transmit to calculation and image output system 1 through copper wire 12, copper sheet 11, electrically conductive sliding ring 9, bearing 8, axostylus axostyle 7. The calculation and image output system 1 is also electrically connected with a zero potential electrode 16 through a lead 15, in order to avoid electric field influence, the zero potential electrode 16 needs to be arranged at a position far away from a geomembrane measuring area, usually more than 100 meters away from the center of the geomembrane measuring area, in order to avoid winding of the lead 15 in the detection process, a wire rewinding device 3 is further arranged on the trolley 2, the wire rewinding device 3 consists of two bearings and a conductive sliding ring, the lead 15 connected with the zero potential electrode 16 is ensured to be timely rewound and unwound through the wire rewinding device 3 according to distance change in the advancing process of the trolley 2, and the occurrence of distortion and tearing is avoided.
As shown in fig. 7, which is a schematic structural diagram of a computing and image output system in an embodiment of the apparatus of the present invention, the operating principle of the apparatus of the present invention is as follows: firstly, establishing an electric field in a geomembrane measuring area by using a power supply electrode, so that each position of the geomembrane measuring area has a corresponding electric potential, and a zero potential electrode 16 is embedded at a position far away from the geomembrane measuring area; then, the device is driven to travel on the geomembrane measuring area, the geomembrane potential at the traveling position is obtained by using the measuring device 6 according to the interval of 0.5 m, the position information at the traveling position is obtained by using the positioning system 4, the zero potential is obtained by using the zero potential electrode 16, the data information is processed by the calculation and image output system 1, the difference between the geomembrane potential and the zero potential is obtained, the geomembrane potential difference at the traveling position is obtained, various data values are output to a display screen in the calculation and image output system 1, meanwhile, a measuring point data graph of the geomembrane measuring area is formed on the basis of the position information at the traveling position and the geomembrane potential difference, and a three-parameter graph is drawn to facilitate judgment of an operator. After the measurement is finished, according to the generated data, drawing a contour map and a color map of the potential of the measuring area, the potential difference and the difference value of the potential difference along the measuring line direction for an operator to analyze and judge.
The specific embodiment of the invention also provides a double-electrode geomembrane leakage position detection system which comprises the device, a power supply electrode and a zero potential electrode 16, wherein the zero potential electrode 16 is electrically connected with the calculation and image output system 1 in the device through a lead 15, and the lead 15 is wound on the wire winder 3 in the device so as to be conveniently and timely wound and released and avoid the distortion and the tearing of the lead 15. The power supply electrode is arranged at the edge of the geomembrane measuring area, the anode of the power supply electrode is arranged at the upper part of the geomembrane and is embedded in the covering layer, the cathode of the power supply electrode is arranged at the lower part of the geomembrane, and the anode and the cathode are fully soaked after being embedded to ensure the conductivity. In this embodiment, the thickness of the upper cladding layer in the geomembrane measuring area is not greater than 60cm, and the power supply voltage applied to the power supply electrode is not lower than 300V. Repeated tests show that under the condition of 300V power supply voltage, when the thickness of the upper coating is more than 60cm, the electric potential acquired by the measuring device 6 is too small, so that the defects existing on the geomembrane are difficult to effectively detect, the power supply voltage is bound to be further improved, and the detection safety is further influenced. The zero potential electrode 16 needs to be buried at a position far away from the geomembrane measuring area, the zero potential electrode needs to be fully soaked after being buried, grounding is guaranteed, the distance between the zero potential electrode 16 and the geomembrane measuring area is not smaller than a preset threshold value, and the threshold value is usually set to be 100 meters so as to avoid interference of an electric field generated by a power supply electrode on the zero potential electrode 16. The area of the geomembrane measuring area is not more than 50m multiplied by 50m, otherwise, the passing current is too small, the electric field is seriously attenuated, and the detection effect is seriously influenced. Therefore, the geomembrane with a large area can be divided into a plurality of measuring areas to be measured respectively by adopting a partition measuring mode.
The specific embodiment of the invention also provides a double-electrode-method geomembrane leakage position detection method, which is realized based on the device and the system of the invention and comprises the following steps:
fully watering the geomembrane measuring area, arranging a power supply electrode at the edge of the measuring area and applying power supply voltage, thereby establishing an electric field in the geomembrane measuring area. The zero potential electrode 16 needs to be embedded at a position which is not less than 100 meters away from the geomembrane measuring area, and the zero potential electrode needs to be fully soaked after the zero potential electrode is embedded, so that grounding is ensured. In this embodiment, the area of the geomembrane measurement region is not greater than 50m × 50m, the thickness of the upper cladding layer of the geomembrane measurement region is not greater than 60cm, and the power supply voltage applied to the power supply electrode is not lower than 300V.
And step two, driving the device to move on the geomembrane measuring area, acquiring position information at the moving position through the positioning system 4, acquiring the geomembrane potential at the moving position through the measuring device 6, acquiring the zero potential through the zero potential electrode 16, extracting the acquired position information, the geomembrane potential and the zero potential through the calculation and image output system 1, and calculating the difference between the geomembrane potential and the zero potential to acquire the geomembrane potential difference at the moving position.
And step three, displaying the extracted and obtained various data through a display screen on the calculation and image output system 1, drawing a contour map and a color map of the potential, the potential difference and the difference value of the potential difference along the measuring line direction of the measuring area, and basically judging the defect position of the geomembrane measuring area by an operator based on the position information and the geomembrane potential difference at the advancing position, and also performing comprehensive judgment by combining various data.
And fourthly, moving the device to the starting end of the next measuring line, starting the measurement of the next measuring line, repeating the work until the advancing range of the device covers the whole geomembrane measuring area, and at the moment, according to the potential contour map of the whole measuring area displayed by the calculation and image output system 1, the operator can visually and accurately determine the position of the abnormal point of the geomembrane and inform the repair personnel of repairing.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A double-electrode-method geomembrane leakage position detection device is characterized by comprising a cart (2), wherein a calculation and image output system (1) and a positioning system (4) are arranged on the cart (2), a measuring device (6) rotationally connected with the cart (2) is arranged at the bottom of the cart (2), the measuring device (6) comprises a roller-shaped measuring device main body (14), and the cart (2) advances on a geomembrane through the measuring device main body (14);
the measuring device main body (14) is made of flexible conductive materials, and the measuring device main body (14) and the positioning system (4) are respectively and electrically connected with the calculating and image outputting system (1).
2. The double-electrode geomembrane leakage position detecting device according to claim 1, wherein the measuring device (6) further comprises a shaft rod (7), a bearing (8) and a conductive slip ring (9), the shaft rod (7) is fixedly connected with the bottom of the cart (2), the conductive slip ring (9) is rotatably connected with the shaft rod (7) along the axial direction thereof through the bearing (8), and the measuring device main body (14) is fixedly connected with the conductive slip ring (9).
3. The double-electrode geomembrane leakage position detecting device according to claim 2, wherein the measuring device (6) further comprises a metal sheet fixedly connected with the conductive slip ring (9) along the radial direction thereof, and a metal wire fixedly connected with the metal sheet along the radial direction of the conductive slip ring (9), wherein the conductive slip ring (9) is clamped with the measuring device body (14) through the metal sheet or/and the metal wire; the metal sheet comprises a copper sheet (11), and the metal wire comprises a copper wire (12).
4. The double-electrode geomembrane leakage position detecting device according to claim 1, wherein the cart (2) is further provided with a water tank (5), and spray nozzles are arranged below the water tank (5);
the measuring device main body (14) is a geotextile wrapped sponge (13) arranged right below the spray nozzle, and water in the water tank (5) can spray the geotextile wrapped sponge (13) to form a flexible conductive material.
5. The double-electrode geomembrane leakage position detecting device according to claim 1, wherein said cart (2) is further provided with a wire take-up (3).
6. A two-electrode method geomembrane seepage position detection system is characterized by comprising the following components: a power supply electrode, a zero potential electrode (16), a bi-electrode geomembrane leakage position detecting device according to any one of claims 1 to 5;
the power supply electrode is arranged at the edge of the geomembrane measuring area, the anode of the power supply electrode is arranged at the upper part of the geomembrane, and the cathode of the power supply electrode is arranged at the lower part of the geomembrane;
the distance between the zero potential electrode (16) and the geomembrane measuring interval is not less than a preset threshold value, and the zero potential electrode (16) is electrically connected with a calculation and image output system (1) in the double-electrode method geomembrane leakage position detecting device through a lead (15).
7. The dual electrode geomembrane leak location detection system according to claim 6, wherein said geomembrane measuring region has an area of not more than 50m x 50 m.
8. The dual electrode geomembrane leak location detection system according to claim 6, wherein the geomembrane measuring region has an overlayer thickness of not greater than 60cm and a power supply voltage applied to the power supply electrode of not less than 300V.
9. A double-electrode-method geomembrane leakage position detection method is characterized by comprising the following steps:
establishing an electric field in the geomembrane measuring area through a power supply electrode;
driving a double-electrode geomembrane leakage position detection device to advance on a geomembrane detection area, acquiring position information at an advancing position through a positioning system (4), acquiring the geomembrane potential at the advancing position through a measurement device (6), and acquiring a zero potential through a zero potential electrode (16);
extracting the acquired position information, the geomembrane potential and the zero potential through a calculation and image output system (1), and calculating the difference between the geomembrane potential and the zero potential to acquire the geomembrane potential difference at the advancing position;
and acquiring the defect position of the geomembrane measuring area based on the position information at the advancing position and the geomembrane potential difference.
10. The method for detecting a location of a geomembrane leak according to the double electrode method of claim 9, wherein an area of the geomembrane measuring region is not more than 50m x 50m, a thickness of the upper cover of the geomembrane measuring region is not more than 60cm, and a power supply voltage applied to the power supply electrode is not less than 300V.
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