Array distribution telescopic electrode device for detecting geomembrane defects

Abstract

The utility model discloses an array distribution telescopic type electrode device used for detecting geomembrane defects, comprising a rigid plate, the lower surface of the rigid plate is uniformly connected with a plurality of telescopic joints at intervals, each telescopic joint is vertically arranged, the top end of each telescopic joint is connected with the lower surface of the rigid plate, the bottom end of each telescopic joint is connected with a support plate, and the support plate is connected with the rigid plate. A pressure sensing piece is arranged between the bottom end of the telescopic joint and the supporting plates, each supporting plate is connected with a detection electrode, the rigid plate, the telescopic joint and the supporting plates are all made of insulating materials, and the detection electrodes are electric conductors. During detection, the expansion joint automatically controls the elongation according to the numerical value of the pressure sensing sheet, so that each detection electrode can adapt to the terrain of a non-uniform settlement area of a reservoir basin, the detection electrodes are in full contact with the surface of a geomembrane in the detection area, the accuracy of potential data measured by the detection electrodes can be ensured, and the detection efficiency is improved. And the geomembrane defect detection precision of the non-uniform settlement area of the reservoir basin can be greatly improved.

Description

Technical Field

[0001] The utility model relates to an array distributed telescopic electrode device for detecting geomembrane defects, belonging to the technical field of geomembrane defect detection. Background Art

[0002] Geomembrane is a new type of flexible geosynthetics with advantages such as superior anti-seepage performance and strong deformation adaptability. It has been widely used in anti-seepage of water conservancy and environmental geotechnical engineering such as reservoir basins, dams, cofferdams and landfills. Geomembrane is thin and has weak resistance to damage. In geomembrane anti-seepage projects, when laying geomembrane and constructing protective layers (especially when using granular cushion layers or upper protective layers), some extensive construction modes can easily cause damage to geomembrane, forming macroscopic defects, leading to leakage, and affecting the anti-seepage safety of reservoir basins. Therefore, in geomembrane anti-seepage projects, geomembrane defect detection is of great significance.

[0003] At present, in geomembrane anti-seepage projects, the double-electrode method is usually used for geomembrane defect detection. The double-electrode method uses the insulation of the geomembrane to set up current loops on the upper and lower sides of the geomembrane, and judges the location of the geomembrane defect through the potential difference distribution law of adjacent measuring points on the geomembrane surface. In the prior art, the detection electrode plate used for regional detection is a plane rigid form, which is suitable for defect detection in the horizontal state of the geomembrane. However, in the geomembrane anti-seepage reservoir with a full reservoir basin, there is uneven settlement in areas such as the junction of reservoir basin excavation and backfill, and the geomembrane presents an uneven state with the undulations of the terrain. At this time, the detection electrode of the plane rigid detection plate cannot fit tightly with the surface of the geomembrane, and the detection potential data will be inaccurate or missing, resulting in low accuracy of geomembrane defect detection, or even defect leakage. Therefore, in order to achieve accurate detection of geomembrane defects in the uneven settlement area of ​​the reservoir basin, the utility model develops an array distributed telescopic electrode device for detecting geomembrane defects. Utility Model Content

[0004] The purpose of the utility model is to provide an array distributed telescopic electrode device for detecting geomembrane defects, in order to solve the problem that the detection electrodes of the existing flat rigid detection plates cannot fit tightly with the surface of the geomembrane in the terrain undulating areas such as the uneven settlement of the reservoir basin, resulting in inaccurate or missing detection potential data.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] An array distributed telescopic electrode device for detecting geomembrane defects, comprising a rigid plate, a plurality of telescopic joints are evenly spaced and connected to the lower surface of the rigid plate, each telescopic joint is vertically arranged, the top of each telescopic joint is connected to the lower surface of the rigid plate, the bottom of each telescopic joint is connected to a support plate, a pressure sensing sheet is arranged between the bottom of the telescopic joint and the support plate, a detection electrode is connected to each support plate, the rigid plate, the telescopic joint and the support plate are all made of insulating materials, and the detection electrode is a conductor;

[0007] The telescopic joint is an electric push rod, the motor of each telescopic joint is connected to the controller, the controller is connected to the power supply through a wire, each pressure sensing sheet is connected to the controller, and the threshold of the pressure sensing sheet is set in the controller;

[0008] Each detection electrode is connected to a data transmitter through a wire, the data transmitter is connected to a power source through a controller, and the data transmitter transmits data to a computer wirelessly; the controller is electrically connected to the data transmitter, and when the detection value of the pressure sensing sheet reaches a threshold, the controller controls the motor of the corresponding expansion joint to stop rotating and turns on the data transmitter.

[0009] According to the terrain of the detection area and the degree of undulation of the laid geomembrane, each expansion joint extends to a different length according to the monitoring value of the pressure induction variable, so as to adjust the vertical position of each detection electrode so that each detection electrode is in full contact with the surface of the geomembrane in the detection area directly below it, so as to ensure high-precision geomembrane defect detection in areas with undulating terrain.

[0010] As an embodiment, a through hole is opened in the center of the support plate, the detection electrode is inserted into the through hole, the detection electrode and the through hole are interference fit, and the top end of the detection electrode is flush with the upper surface of the support plate.

[0011] As another embodiment, a threaded hole is opened in the center of the support plate, and an external thread matching the threaded hole is processed on the outer surface of the detection electrode. The detection electrode thread is screwed into the center of the support plate, and the top of the detection electrode is flush with the upper surface of the support plate.

[0012] Preferably, at least one connection block is disposed on the upper surface of the rigid plate, and the connection block is disposed close to an edge of the rigid plate.

[0013] Multiple electrode detection devices can be connected together through the connection block to realize geomembrane defect detection in areas with different terrain undulations.

[0014] Preferably, the support plate is a square structure, and the mounting hole for mounting the detection electrode is opened at the center of the square.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] During detection, the utility model automatically controls the extension amount of the expansion joint according to the value of the pressure sensing piece, so that each detection electrode can adapt to the terrain of the uneven settlement area of ​​the reservoir basin, so that the detection electrode is in full contact with the surface of the geomembrane in the detection area, which can ensure the accuracy of the potential data measured by the detection electrode and greatly improve the detection accuracy of geomembrane defects in the uneven settlement area of ​​the reservoir basin.

[0017] The utility model can realize one-time multi-point detection through the array detection electrodes on the detection plate; a plurality of detection devices can be used in combination through the connecting block to realize high-precision and high-efficiency geomembrane defect detection in areas with different ranges of terrain undulations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the detection board in its initial state is shown;

[0019] Figure 2 The structure of the detection plate after the extension of some telescopic joints is shown;

[0020] Figure 3 The structure of connecting the detection electrode to the support plate is shown;

[0021] Figure 4 The exploded structure of the probe plate is shown;

[0022] Figure 5 Shows the structure of multiple detection boards connected together for use;

[0023] Figure 6 A schematic diagram showing the utility model when working on the bottom surface of the reservoir basin;

[0024] Explanation of reference numerals: 1—detection electrode, 2—support plate, 3—nut, 4—expansion joint, 5—rigid plate, 7—connection block, 8—detection device one, 9—detection device two, 10—detection device three, 11—connection strip, 12—combined array distributed telescopic geomembrane defect detection device. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0026] like Figure 1-4As shown, an array distributed telescopic electrode device for detecting geomembrane defects includes a rigid plate 5, a plurality of telescopic joints 4 are evenly spaced and connected to the lower surface of the rigid plate, each telescopic joint is vertically arranged, and the telescopic direction of each telescopic joint is vertical, the top of each telescopic joint is connected to the lower surface of the rigid plate, the bottom of each telescopic joint is connected to a support plate 2, a pressure sensing sheet is arranged between the bottom end of the telescopic joint and the support plate, a detection electrode 1 is connected to each support plate, the top end of the detection electrode is connected to the support plate, and the bottom end of the detection electrode is used to contact the geomembrane, and in order to ensure the accuracy of the data of the pressure sensing sheet, the detection electrode and the telescopic joint are coaxially arranged.

[0027] A detection electrode, a support plate and a telescopic joint constitute a detection unit, and a total of m×n detection units are arranged in an array.

[0028] The optional models of pressure sensing sheets are BW700AK, LC700A, etc.

[0029] like Figure 3 As shown, in this embodiment, the support plate is a square plate with a through hole in the center. The detection electrode is inserted into the through hole. The detection electrode and the through hole have an interference fit. A threaded hole can also be opened in the center of the support plate. The detection electrode is processed with an external thread that matches the threaded hole. The detection electrode thread is screwed in the center of the support plate and fastened by a nut 3 so that the top of the detection electrode is flush with the upper surface of the support plate.

[0030] like Figure 4 , 5 As shown, two connection blocks 7 are arranged on the upper surface of the rigid plate 5, and one connection block is arranged at each of the left and right edges of the rigid plate. By connecting the connection blocks of two adjacent detection devices, the two detection devices can be connected for use.

[0031] like Figure 5 Each connecting block is provided with a threaded hole, and a connecting strip is connected to two adjacent connecting blocks. Through holes are provided at both ends of the connecting strip. Bolts are screwed into the threaded holes of the corresponding connecting blocks through the through holes to connect the connecting strip to the connecting block, and the connecting strip is kept to rotate relative to the connecting block. In this way, the detection device 1 8, the detection device 2 9, and the detection device 3 10 are connected together through the connecting strip to form a detection device for detecting such as Figure 6 The combined array of raised foundations shown is provided with telescopic geomembrane defect detection devices 12 distributed thereon.

[0032] The expansion joint can use an electric push rod of model BMXL. The motor of each expansion joint is connected to the controller, which is connected to the power supply through a wire. The controller controls the start and stop and forward and reverse rotation of the motor. Each pressure sensing sheet is also connected to the controller. The threshold of each pressure sensing sheet is set in the controller. When the controller detects that the detection value of a certain pressure sensing sheet reaches the threshold, it means that the detection electrode is in full contact with the geomembrane, and the controller controls the motor of the corresponding expansion joint to stop rotating. The controller can be a common PLC controller.

[0033] The rigid plate, expansion joint and support are all made of insulating materials, and the detection electrode is a conductor.

[0034] by Figure 5 Taking the detection device 8 as an example, Figure 2 A method for adjusting the telescopic joint is given, wherein the telescopic joints 4a and 4f are at low terrain and are in a state of greater extension; the telescopic joints 4b, 4c, and 4e are at low terrain and are in a state of less extension; the telescopic joint 4d is at high terrain and is in an unextended state. Figure 5 The adjustment methods of the telescopic joints of the middle detection device 2 9 and the detection device 3 10 are similar.

[0035] Each detection electrode is connected to a data transmitter through a wire. The data transmitter integrates the same number of detection elements as the detection electrodes, and each detection element has a unique number. Each detection element monitors and records the voltage and current signals in the wire circuit of each detection electrode. The data transmitter is connected to the power supply through the controller. The data transmitter can transmit data to the computer wirelessly. The data transmitter can be Toprie brand and model TP740. Drawing the potential diagram on the computer and judging the location of the geomembrane defect based on the potential diagram are both existing technologies.

[0036] The controller is electrically connected to the data transmitter. In the initial state, the extension of all expansion joints in the detection device is zero. When the detection starts, the motor of each expansion joint is energized to make each expansion joint extend at a uniform speed, so that the detection electrode contacts the geomembrane. When the detection electrode contacts and squeezes the geomembrane, the pressure sensing piece at the bottom of the expansion joint transmits the pressure value to the controller in real time. The controller compares and determines whether the pressure detection value reaches the threshold in real time. When the controller detects that the detection value of a certain pressure sensing piece reaches the threshold, it controls the motor of the corresponding expansion joint to stop rotating. The controller detects that the detection value of each pressure sensing piece reaches the threshold, indicating that each detection electrode is in full contact with the geomembrane, and then the controller turns on the data transmitter to start the data transmitter.

[0037] like Figure 6As shown, the double-electrode method is used to detect geomembrane defects. The main electrode is pre-arranged in the reservoir water above the geomembrane in the reservoir basin, and the feedback electrode is arranged in the cushion layer under the geomembrane. The main electrode and the feedback electrode are energized through the power supply. Under the action of the power supply, the electrode and the feedback electrode form a potential field in the geomembrane defect detection area (i.e., in the reservoir basin). The detection electrode measures the potential on the geomembrane. When the detection electrode moves toward the defect, the measured potential (difference) will increase, and the maximum abnormal value will appear when the defect is reached. After completing the detection of this area, the controller controls the motor of the corresponding expansion joint to reverse and restore the detection electrode to its initial state. According to the measured electrical data of each point, the surface potential distribution map of the geomembrane in the detection area is drawn. If there is an area with abnormally high voltage, the location of the geomembrane defect can be accurately judged to be in the abnormal area, so as to achieve high-precision detection of geomembrane defects in a certain area of ​​the reservoir basin with large terrain fluctuations.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An array distributed telescopic electrode device for detecting geomembrane defects, characterized by: It includes a rigid plate, a plurality of expansion joints are evenly spaced and connected to the lower surface of the rigid plate, each expansion joint is vertically arranged, the top of each expansion joint is connected to the lower surface of the rigid plate, the bottom of each expansion joint is connected to a support plate, a pressure sensing sheet is arranged between the bottom of the expansion joint and the support plate, each support plate is connected to a detection electrode, the rigid plate, the expansion joint and the support plate are all made of insulating materials, and the detection electrode is a conductor; The telescopic joint is an electric push rod, the motor of each telescopic joint is connected to the controller, the controller is connected to the power supply through a wire, each pressure sensing sheet is connected to the controller, and the threshold of the pressure sensing sheet is set in the controller; Each detection electrode is connected to a data transmitter through a wire, the data transmitter is connected to a power source through a controller, and the data transmitter transmits data to a computer wirelessly; the controller is electrically connected to the data transmitter, and when the detection value of the pressure sensing sheet reaches a threshold, the controller controls the motor of the corresponding expansion joint to stop rotating and turns on the data transmitter.

2. The array distributed telescopic electrode device for detecting geomembrane defects according to claim 1 is characterized in that: A through hole is provided at the center of the support plate, and the detection electrode is inserted into the through hole. The detection electrode and the through hole are interference fit, and the top end of the detection electrode is flush with the upper surface of the support plate.

3. The array distributed telescopic electrode device for detecting geomembrane defects according to claim 1 is characterized in that: A threaded hole is provided at the center of the support plate, and an external thread matching the threaded hole is processed on the outer surface of the detection electrode. The detection electrode thread is screwed in the center of the support plate, and the top of the detection electrode is flush with the upper surface of the support plate.

4. The array distributed telescopic electrode device for detecting geomembrane defects according to claim 1 is characterized in that: At least one connection block is arranged on the upper surface of the rigid plate, and the connection block is arranged close to the edge of the rigid plate.

5. The array distributed telescopic electrode device for detecting geomembrane defects according to claim 2 or 3, characterized in that: The supporting plate is a square structure.

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