JP2017167111A - Method of detecting position of water leakage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of separately detecting, even when a water shielding sheet includes a plurality of water leakage portions, the water leakage portions.SOLUTION: The method includes an AC power source 15 and a current measuring circuit 16. A first electrode 11 is connected to one end side of the AC power source. One of a plurality of first-direction wire electrodes, which constitute a second wire electrode group, is selected and current measuring by the current measuring circuit is performed for all of the first-direction wire electrodes. When an increase in a current value of at least one of the first-direction wire electrodes is detected, one of the plurality of second-direction wire electrodes is selected and connected to another end side of the AC power source, and the current measurement by the current measuring circuit is performed for all of the second-direction wire electrodes. Then, on the basis of a result of the measurement by the current measuring circuit, a water leakage position of a water shielding sheet is determined.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water leak occurrence position detection method in a management-type final disposal site constructed by laying a water shielding sheet such as a synthetic resin, a synthetic rubber sheet, or asphalt.

  Conventionally, in an artificially managed final disposal site constructed by laying a water shielding sheet in a created depression, after the waste is brought in, the water shielding sheet is damaged in the ground, such as cracks. It is not desirable for the wastewater to leak. If water leakage occurs, it may cause groundwater contamination if the water leakage contains pollutants, so water-proof sheets are regularly inspected at managed final disposal sites. One of the work of checking the water shielding sheet is to detect the occurrence of water leakage and its position electrically. In this inspection work, when the occurrence and position of water leakage are detected, the appropriate place in the disposal site is dug up and appropriate repairs are made to the water-impervious sheet.

  Various methods are known as a method for detecting a leakage occurrence position of such a water shielding sheet. The 1st example of the conventional method is described in FIG. 3 of patent document 1 as a water leak generation | occurrence | production position detection system, and is demonstrated with reference to FIG.

  In FIG. 6, the water leak occurrence position detection method according to the first example is applied to a management-type final disposal site constructed by laying a water shielding sheet 100. In this example, a plurality (here, five) of upper linear electrodes A1 to A5 are arranged in parallel on the upper side of the water shielding sheet 100, and a plurality of upper linear electrodes A1 to A1 are disposed on the lower side of the water shielding sheet 100. A plurality (here, five) of lower linear electrodes B1 to B5 are arranged in parallel so as to intersect with A5.

  The upper electrode switch 110 is connected to one end side of the upper linear electrodes A1 to A5, and the other end side is opened. The lower electrode switch 120 is connected to one end side of the lower linear electrodes B1 to B5, and the other end side is opened.

  The upper electrode switch 110 selects one of the upper linear electrodes A1 to A5 and connects it to one end side of the AC power supply 130. The lower electrode switcher 120 selects one of the lower linear electrodes B <b> 1 to B <b> 5 and connects it to the other end side of the AC power supply 130 via the current measurement circuit 140.

  A synchronous detection circuit 150 is connected to one end of the AC power supply 130 and the output of the current measurement circuit 140 to extract the output.

  In the water leak occurrence position detection method according to the first example, one upper linear electrode (A3 in FIG. 6) selected by the upper electrode switch 110 and one lower linear selected by the lower electrode switch 120. An AC voltage from the AC power source 130 is applied between the electrodes (B4 in FIG. 6), and the current flowing between the upper and lower electrodes is measured by the current measuring circuit 140. This current measurement is performed while sequentially switching the upper linear electrode selected by the upper electrode switching unit 110 and the lower linear electrode selected by the lower electrode switching unit 120 one by one. The synchronous detection circuit 150 performs synchronous detection on the output of the current measurement circuit 140 at the phase of the applied voltage. In the synchronous detection, if a current having the same phase as the applied voltage rises, it is determined that water leakage has occurred near the combination intersection of the upper linear electrode and the lower linear electrode at that time.

  A second example of the conventional method is described in FIG. 2 of Patent Document 1 as a water leak occurrence position detection method, and will be described with reference to FIG.

  In FIG. 7, the water leak occurrence position detection method according to the second example is applied to a managed final disposal site constructed by laying a water shielding sheet 200. In this example, a plate-like or rod-like first electrode 210 is installed on either the upper or lower side of the water-impervious sheet 200, and a grid-like second linear shape is provided on the other upper or lower side of the water-impervious sheet 200. An electrode group 220 is provided. The second linear electrode group 220 has a plurality of (here, five) first direction linear electrodes A1 to A5 and a plurality (here, five) of second direction linear electrodes B1 to B5 in a lattice shape. In addition, the intersection portions are subjected to insulation treatment.

  The first electrode 210 is connected to one end side of the AC power supply 230. The electrode switch 240 is connected to one end side of the first direction linear electrodes A1 to A5 and the second direction linear electrodes B1 to B5, and the other end side is opened.

  In this example, the electrode switcher 240 selects one of the plurality of first direction linear electrodes A1 to A5 or the plurality of second direction linear electrodes B1 to B5, and passes through the current measurement circuit 250. The AC power supply 230 is connected to the other end side, and has a function of connecting all the selected first direction linear electrodes and second direction linear electrodes to the other end side of the AC power supply 230.

  A synchronous detection circuit 260 is connected to one end side of the AC power supply 230 and the output of the current measurement circuit 250 to extract the output.

  In the water leak occurrence position detection method according to the second example, an AC voltage from an AC power source 230 is applied between the first electrode 210 and the grid-like second linear electrode group 220, and the electrode switch 240 is selected. The current measurement circuit 250 measures the current flowing through one first-direction linear electrode (A4 in FIG. 7). This current measurement is performed while the electrode switcher 240 sequentially selects the first direction linear electrodes A1 to A5 one by one. When the current measurement is completed for the first direction linear electrodes A1 to A5, the electrode switch 240 performs current measurement while sequentially selecting the second direction linear electrodes B1 to B5 one by one. Then, the synchronous detection circuit 260 performs synchronous detection on the output of the current measurement circuit 250 at the phase of the applied voltage. In the synchronous detection, if a current having the same phase as the applied voltage rises, it is determined that water leakage has occurred near the combination intersection of the first direction linear electrode and the second direction linear electrode at that time.

JP 11-248590 A

  In the water leak occurrence position detection method according to the first example, since measurement is required for all the electrode intersections at the upper and lower electrode intersections of the water shielding sheet, there is a disadvantage that the measurement time becomes long.

  On the other hand, in the water leak occurrence position detection method according to the second example, a current difference generated in one linear electrode in the grid-like second linear electrode group is measured through the impedance of the water leakage location of the water shielding sheet. . As will be described later, this water leak occurrence position detection method has a drawback in that when a plurality of water leaks occur in the water shielding sheet, these leak points cannot be accurately separated and detected. That is, in this water leak occurrence position detection method, when a plurality of water leaks occur in the water shielding sheet, a ghost occurs and the number of water leak positions increases, so the measurement results using other measurement means There is a disadvantage that requires a work to separate a plurality of water leakage positions by using the same.

  The present invention has been made to solve the above-mentioned drawbacks, and even when water leakage has occurred at a plurality of locations on the water shielding sheet, not only the separation of the water leakage location but also the degree of breakage, An object of the present invention is to provide a water leak occurrence position detection method capable of detecting the degree of water leak.

  According to the aspect of the present invention, at least one first electrode provided on one of the upper and lower sides of the water shielding sheet and N pieces (N is an integer of 2 or more) extending in parallel to each other in the first direction. First direction linear electrodes and M (M is an integer of 2 or more) second direction linear electrodes extending in a second direction perpendicular to the first direction in parallel to each other, Using a grid-like second linear electrode group formed by insulating the intersection of the one-directional linear electrode and the second directional linear electrode and arranging them on the upper and lower other sides of the water shielding sheet. A water leakage occurrence position detection method for detecting a water leakage occurrence position in the water shielding sheet, a power source for applying a voltage between the first electrode and the second linear electrode group, a current measurement circuit, The first electrode is connected to one end of the power source, and all the M second direction linear electrodes are opened. And selecting one of the N first directional linear electrodes and connecting it to the other end of the power source via the current measuring circuit, and selecting the unselected first directional linear electrode The current measurement by the current measurement circuit connected to the other end of the power source is performed for all the first direction linear electrodes, and an increase in current value is detected for at least one of the first direction linear electrodes. If at least one first direction linear electrode is connected to the current measuring circuit, at least one of the M second direction linear electrodes is selected and the power supply The second direction linear electrodes that are not selected are connected to the other end side, and the current measurement by the current measurement circuit is performed for all the second direction linear electrodes, and based on the measurement result of the current measurement circuit. Leakage of the water shielding sheet Leak occurrence position detection method, characterized by determining the occurrence position is provided.

  According to the present invention, it is possible to effectively separate and identify a plurality of water leak locations even when a plurality of water leaks occur in the water shielding sheet. It can be detected accurately. Moreover, since it is not necessary to measure all the electrode intersections of the grid-like linear electrode group arrange | positioned in any one of the upper and lower sides of a water shielding sheet, there exists an effect that measurement time becomes short.

It is a figure for demonstrating 1st Embodiment of the water leak generation | occurrence | production position detection system by this invention. It is a figure for demonstrating the case where the water leak of several places is detected by the water leak generation | occurrence | production position detection system of 1st Embodiment. It is a figure for demonstrating 2nd Embodiment of the water leak generation | occurrence | production position detection system by this invention. It is a figure for demonstrating 3rd Embodiment of the water leak generation | occurrence | production position detection system by this invention. It is a figure which shows an example in the case of implement | achieving two electrode switchers shown by FIG. 1 alone. It is a figure for demonstrating the 1st example of the conventional water leak generation | occurrence | production position detection system. It is a figure for demonstrating the 2nd example of the conventional water leak generation | occurrence | production position detection system.

  With reference to FIGS. 1-5, several embodiment is demonstrated about the water leak generation | occurrence | production position detection system by this invention, and the water shielding sheet test | inspection apparatus used for this.

  FIG. 1 is a diagram showing the configuration of the first exemplary embodiment of the present invention. In the present embodiment, a plate-like or rod-like first electrode 11 is arranged on the upper side of the water-impervious sheet 10 laid in the management-type final disposal site, and the intersection portion is insulated on the lower side of the water-impervious sheet 10. A grid-like second linear electrode group 12 is arranged. The second linear electrode group 12 includes N (here, five) first direction linear electrodes A1 to A5 extending in parallel to each other in the first direction, and a second orthogonal to the first direction in parallel with each other. M (here, 5) second direction linear electrodes B1 to B5 extending in the direction of. The positional relationship between the first electrode 11 and the second linear electrode group 12 is opposite, that is, the first electrode 11 is below the water shielding sheet 10 and the second linear electrode group 12 is above the water shielding sheet 10. May be arranged respectively. Further, the number N of the first direction linear electrodes and the number M of the second direction linear electrodes may be integers of 2 or more, and N = M is desirable, but is not limited thereto.

  The installation of the first electrode 11 and the second linear electrode group 12 is usually performed together with the construction work of the water shielding sheet 10. One end side of the first electrode 11 and the second linear electrode group 12 may be led together by an insulated cable to one place so that electrical connection with a water shielding sheet inspection apparatus to be described later can be facilitated. desirable.

  In the present embodiment, the impermeable sheet inspection apparatus includes a first electrode switch 13, a second electrode switch 14, an AC power supply 15, and a current measurement circuit 16. These are accommodated in a portable housing, and are carried into the work site when the water shielding sheet 10 is inspected.

  The first electrode 11 is connected to one end side of the AC power supply 15. The first electrode switch 13 is connected to one end side of the first directional linear electrodes A1 to A5, and the other end side is opened. The second electrode switching device 14 is connected to one end side of the second direction linear electrodes B1 to B5, and the other end side is opened. For this reason, in the impermeable sheet inspection apparatus, one external connection terminal for connecting to the first electrode 11 and the first electrode switching device 13 for connecting to the first directional linear electrodes A1 to A5. It is desirable to provide five external connection terminals and five external connection terminals for connecting the second electrode switch 14 to the second directional linear electrodes B1 to B5.

  The first electrode switch 13 has five switches corresponding to the number of the first direction linear electrodes A1 to A5, and one of the one end sides of the first direction linear electrodes A1 to A5 is connected to the current measuring circuit 16. It has a switching function capable of connecting to the other end side of the AC power supply 15 via the other end side of the remaining first direction linear electrodes A1 to A5 as it is. With this switching function, the current measurement circuit 16 can measure the current flowing through the selected first direction linear electrode.

  The second electrode switching device 14 has five switching devices corresponding to the number of the second direction linear electrodes B1 to B5, and opens one end side of each of the second direction linear electrodes B1 to B5. Alternatively, one end side of the second direction linear electrodes B1 to B5 can be connected to the other end side of the AC power supply 15, and one end side of the remaining second direction linear electrodes B1 to B5 can be opened. Has a switching function. In other words, as will be described later, the second electrode switching unit 14 performs the current measurement by the current measurement circuit 16 while switching the first directional linear electrodes A1 to A5 in the first electrode switching unit 13. Makes all the one end sides of the second direction linear electrodes B1 to B5 open. FIG. 1 shows a state in which the first direction linear electrode A3 is connected to the current measurement circuit 16, and the second direction linear electrodes B1 to B5 are all opened.

  FIG. 1 also shows that water leakage due to breakage (holes) of the water shielding sheet 10 occurs near the intersection of the first direction linear electrode A3 and the second direction linear electrode B3.

  In the configuration as described above, when the first directional linear electrodes connected to the current measuring circuit 16 are sequentially switched one by one by the first electrode switching device 13, the current from the first electrode 11 is most likely to flow into the water leakage location. Since a large amount of current flows into the first directional linear electrode A3, the measurement result of the current measuring circuit 16, that is, an increase in the current value, indicates that water leakage due to breakage of the water shielding sheet 10 is in the vicinity of the first directional linear electrode A3. Can be judged. The above detection operation is referred to as a first step detection operation.

  Next, the electrode switching by the first electrode switcher 13 is fixed to the first directional linear electrode A3 indicating an increase in the current value, and the second electrode switcher 14 is connected to the other end side of the AC power supply 15. The current measurement circuit 16 measures the value of the current flowing through the first direction linear electrode A3 while sequentially switching the second direction linear electrodes. The above detection operation is referred to as a second step detection operation.

  In the detection operation of the second step, a large amount of current from the first electrode 11 also flows into the second directional linear electrode B3 closest to the water leakage location, so the current value flowing into the first directional linear electrode A3 is relative. The phenomenon of falling down occurs. Thereby, it can be determined that the water leakage due to the breakage of the water shielding sheet 10 is in the vicinity of the second directional linear electrode B3.

  Based on the determination result of the detection operation of the first step and the determination result of the detection operation of the second step, water leakage due to damage of the water shielding sheet 10 is caused by the first direction linear electrode A3 and the second direction linear electrode B3. It can be determined that it exists in the vicinity of the intersection.

  In addition, by knowing the amount of increase in the current value in the detection operation of the first step and the amount of decrease in the current value in the detection operation of the second step, the degree of water leakage is regarded as the degree of breakage of the water shielding sheet (hole size). I can grasp it.

  Here, in FIG. 1, the horizontal direction of the drawing is referred to as a first direction and the vertical direction of the drawing is referred to as a second direction, but the vertical direction may be referred to as a first direction and the horizontal direction may be referred to as a second direction. In other words, the grid-like second linear electrode group 12 can obtain the same effect even if the first direction and the second direction are interchanged. That is, the combination of the first electrode switch 13 and the current measuring circuit 16 is connected to the second direction linear electrodes B1 to B5, and the second electrode switch 14 is connected to the first direction linear electrodes A1 to A5. good. After switching the connection in this manner, the detection accuracy of the water leakage occurrence position can be improved by performing the same first-step detection operation and second-step detection operation as described above. In particular, by using the water shielding sheet inspection apparatus provided with the aforementioned external connection terminals, such connection switching can be easily realized by simply switching the connection to the external connection terminals of the water shielding sheet inspection apparatus. Can do.

  In the present embodiment, an AC ammeter is used as the current measuring circuit 16, but a DC power source can be used instead of the AC power source 15. In this case, it goes without saying that a DC ammeter is used for the current measuring circuit 16. As described above, the arrangement of the first electrode 11 and the grid-like second linear electrode group 12 shows the same effect regardless of the arrangement of the water shielding sheet 10 in any vertical relationship. Further, the water shielding sheet may have a double structure. In this case, the grid-like second linear electrode group is disposed in the intermediate layer of the double-layer water-proof sheet, and the first upper electrode and the lower water-block sheet are respectively provided on the upper side of the upper water-proof sheet. By arranging the electrodes, it is possible to detect the water leakage occurrence position in the upper water shielding sheet and the lower water shielding sheet of the double structure water shielding sheet.

  FIG. 2 is a diagram for explaining a case where water leakage at a plurality of locations (here, 2 locations) generated in the water shielding sheet is detected using the configuration described in FIG. 1.

  In FIG. 2, the upper and lower electrode arrangements of the water shielding sheet 10 and the water shielding sheet inspection apparatus are the same as those shown in FIG. It is assumed that water leakage due to damage (holes) at two places occurs in the water shielding sheet 10. In this case, in the water leak occurrence position detection method described with reference to FIG. 7, the first direction linear electrode A2 and the second direction linear electrode B4 are near the intersection of the first direction linear electrode A2 and the second direction linear electrode B2. Leakage due to damage at a total of four locations near the intersection, near the intersection between the first direction linear electrode A5 and the second direction linear electrode B2, and near the intersection between the first direction linear electrode A5 and the second direction linear electrode B4 Is detected. However, leakage detected near the intersection of the first direction linear electrode A2 and the second direction linear electrode B2 and near the intersection of the first direction linear electrode A5 and the second direction linear electrode B4 actually causes leakage. It's called a ghost, not a spot.

  On the other hand, in this embodiment, it is determined that there is water leakage in the vicinity of the first direction linear electrode A2 and the first direction linear electrode A5 in the detection operation of the first step. In the subsequent detection operation of the second step, the first electrode switch 13 fixes the connection of the first direction linear electrode A2 to the current measuring circuit 16, and the second electrode switch 14 fixes the second direction linear electrode. Even if B2 is connected to the other end side of the AC power supply 15, the current value in the current measuring circuit 16 does not drop. Similarly, the second directional linear electrode B4 is connected to the AC power supply 15 by the second electrode switching device 14 in a state where the first directional linear electrode A5 is fixed to the current measuring circuit 16 by the first electrode switching device 13. Even if it is connected to the end side, the current value in the current measuring circuit 16 does not drop.

  On the other hand, the second electrode 14 is connected to the other end of the AC power supply 15 by the second electrode switch 14 while the first electrode 13 is fixed to the current measuring circuit 16 by the first electrode switch 13. When connected to the side, a current value drop occurs in the current measurement circuit 16 for the reason described in the first embodiment. Similarly, the second directional linear electrode B2 is connected to the AC power supply 15 by the second electrode switching device 14 in a state where the first directional linear electrode A5 is fixed to the current measuring circuit 16 by the first electrode switching device 13. When connected to the end side, a current value drop in the current measuring circuit 16 occurs. As a result, water leakage due to damage (holes) in the water shielding sheet 10 is caused near the intersection of the first direction linear electrode A2 and the second direction linear electrode B4 and between the first direction linear electrode A5 and the second direction linear electrode B2. It can be determined that it exists in two places near the intersection.

  FIG. 3 is a diagram showing the configuration of the second exemplary embodiment of the present invention. In FIG. 3, the same components as those in the first embodiment described in FIG. 1 are denoted by the same reference numerals, and descriptions of the same components are omitted. This embodiment is different from the first embodiment in that a synchronous detection circuit 18 is connected to one end of the AC power supply 15 and the output of the current measurement circuit 16, and the output of the current measurement circuit 16 is synchronized with the phase of the AC power supply 15. This is in that the current value synchronized with the applied voltage is measured by detection. According to such 2nd Embodiment, there exists an effect that the influence of the electric current which flows through the capacitive component of the impermeable sheet 10 can be removed by synchronous detection.

  FIG. 4 is a diagram showing the configuration of the third exemplary embodiment of the present invention. In FIG. 4, the same components as those of the second embodiment described in FIG. 3 are denoted by the same reference numerals, and the description of the same components is omitted. This embodiment is different from the second embodiment in that the impermeable sheet inspection apparatus further performs switching control of five switching units in the first electrode switching unit 13 and the second electrode switching unit 14. 19, the processing part 20 which processes the output of the synchronous detection circuit 18, and determines the location of the water leakage occurrence in the water shielding sheet 10, and the display part 21 which displays the processing result of the processing part 20.

  The switching control unit 19 stores a program for executing a predetermined switching control operation in the first electrode switching unit 13 and the second electrode switching unit 14, and reads the program from this memory to perform the switching control operation. CPU (Central Processing Unit) to be executed.

  A signal output from the synchronous detection circuit 18 in accordance with the switching control operation in the first electrode switch 13 and the second electrode switch 14 is converted into a digital signal and sent to the processing unit 20. The processing unit 20 can be realized by a PC (Personal Computer), particularly a portable PC.

  As in FIG. 1, description will be made assuming that water leakage due to damage (holes) of the water shielding sheet 10 occurs near the intersection of the first direction linear electrode A3 and the second direction linear electrode B3.

  The processing unit 20 determines that the current value obtained through the first directional linear electrode A3 from the signal obtained through the synchronous detection circuit 18 in the detection operation of the first step described with reference to FIG. 1 exceeds a predetermined first threshold value. Determine and store this.

  Next, the processing unit 20 determines that the current value obtained through the second directional linear electrode B3 from the signal obtained through the synchronous detection circuit 18 in the detection operation of the second step described in FIG. 1 exceeds the predetermined second threshold value. It is determined to descend and memorized.

  Subsequently, the processing unit 20 determines that leakage due to damage of the water shielding sheet 10 exists near the intersection of the first direction linear electrode A3 and the second direction linear electrode B3 based on the stored result, and the determination result is It is displayed on the display unit 21. In the display unit 21, the water leakage occurrence position in the water shielding sheet 10 is displayed with coordinates, but not only that, for example, after displaying a plan view of the grid-like second linear electrode group 12, the water leakage occurrence position is displayed. It may be displayed in a superimposed manner.

  Needless to say, the various modifications described in the first embodiment are also applied to the second and third embodiments.

  FIG. 5 shows an example of a configuration when the first electrode switch 13 and the second electrode switch 14 used in the first to third embodiments are realized as a single electrode switch. Here, in order to simplify the description, a case will be described in which the first direction linear electrodes are three of A1, A2, and A3, and the second direction linear electrodes are three of B1, B2, and B3. .

  In FIG. 5, the electrode switch 30 is for opening three (N = 3) first direction linear electrodes A1 to A3 and three (M = 3) second direction linear electrodes B1 to B3, respectively. A first-stage electrode switching unit composed of 6 (N + M = 6) switches 31 connected to one of the terminal 31-1 and the connection terminal 31-2 and 6 (N + M = 6) connection terminals 31- 6 (N + M = 6) 2 are connected to one of the current measurement terminal 32-1 connected to the current measurement circuit 16 and one of the power connection terminals 32-2 connected to the other end of the AC power supply 15, respectively. And a second-stage electrode switching unit including the switching unit 32. Here, it is desirable that the switching operations of the fourth to sixth switches of the first stage electrode switching unit and the fourth to sixth switches of the second stage electrode switching unit are switched simultaneously. For example, when the 4th to 6th switches of the first stage electrode switching unit are switched to the open terminal 31-1 side, the 4th to 6th switches of the second stage electrode switching unit are also for current measurement. It is switched to terminal 32-1. When the fourth to sixth switches of the first stage electrode switching unit are switched to the connection terminal 31-2 side, the fourth to sixth switches of the second stage electrode switching unit are also connected to the power supply terminals. It is switched to 32-2. Thus, for example, when only the fifth switch of the first stage electrode switching unit is switched to the connection terminal 31-2 side, the corresponding fifth switch of the second stage electrode switching unit is also used for power connection. It is switched to the terminal 32-2.

  The first embodiment of FIG. 1, that is, assuming that water leakage due to breakage (hole) of the water shielding sheet 10 occurs near the intersection of the first direction linear electrode A3 and the second direction linear electrode B3. In the detection operation of the first step, the first to third switches 31 of the first stage electrode switching unit connect all the first directional linear electrodes A1 to A3 to the connection terminal 31-2, and the fourth step The sixth switch 31 connects all the second direction linear electrodes B1 to B3 to the opening terminal 31-1. On the other hand, in the detection operation of the first step, only one of the first to third switches 32 of the second-stage electrode switching unit is connected to one of the first directional linear electrodes A1 to A3, and the connection terminal 31- 2 is connected to the current measuring terminal 32-1 and the remaining first direction linear electrodes A1 to A3 are connected to the power supply connecting terminal 32-2 via the connecting terminal 31-2. In this way, the first direction linear electrodes A1 to A3 are sequentially connected to the current measuring circuit 16 one by one to measure the current value. As a result, as described in FIG. 1, a current value exceeding a predetermined first threshold value is detected in the first directional linear electrode A3.

  As described with reference to FIG. 1, the detection operation of the second step is performed by connecting the first directional linear electrodes A1 and A2 to the other end of the AC power supply 15 and connecting the first directional linear electrode A3 to the current measuring circuit 16. It is executed while maintaining the connected state.

  In the detection operation of the second step, only one of the fourth to sixth switches 31 of the first stage electrode switching unit is switched, and one of the second directional linear electrodes B1 to B3 is connected to the connection terminal 31. -2 and the rest of the second direction linear electrodes B1 to B3 remain connected to the open terminal 31-1. At the same time, only one switch of the second stage electrode switching unit corresponding to the one of the first stage electrode switching units is switched and connected to the power connection terminal 32-2. The switches other than the one of the second-stage electrode switching unit remain connected to the current measurement terminal 32-1.

  In this way, the second direction linear electrodes B1 to B3 are sequentially connected to the other end of the AC power supply 15 one by one, and the current value at that time is measured by the current measurement circuit 16. As a result, as described with reference to FIG. 1, a current value that falls below a predetermined second threshold value in the second directional linear electrode B3 is detected.

  It goes without saying that the switching as described above can also be realized by the switching control unit 19 described in FIG.

  In addition, this electrode switch 30 connects the combination of the 1st electrode switch 13 and the electric current measurement circuit 16 which were demonstrated in 1st Embodiment to 2nd direction linear electrode B1-B5, and is 2nd electrode switch Switching to connect 14 to the first direction linear electrodes A1 to A5 can also be realized.

(Effect of embodiment)
As is clear from the above description, according to the embodiment of the present invention, the first electrode provided on the upper side (or the lower side) of the water shielding sheet and a plurality of first direction lines extending in the first direction. And a plurality of second direction linear electrodes extending in a second direction orthogonal to the first direction, and an intersection of the first direction linear electrode and the second direction linear electrode A leakage occurrence position detection method for detecting a leakage occurrence position in the water shielding sheet using a grid-like second linear electrode group that is insulated and disposed on the lower side (or upper side) of the water shielding sheet. Is provided.

  In this water leak occurrence position detection method, a power source for applying a voltage between the first electrode and the second linear electrode group and a current measurement circuit are prepared, and one end side of the power source is provided. The first electrode is connected. Then, one of the plurality of first direction linear electrodes is selected in a state where all the plurality of second direction linear electrodes are opened, and the other end side of the power source is passed through the current measurement circuit. In addition, the first direction linear electrode that is not selected is connected to the other end of the power source, and the current measurement by the current measurement circuit is performed for all the first direction linear electrodes. Subsequently, when an increase in current value is detected for at least one of the first direction linear electrodes, the at least one first direction linear electrode is connected to the current measuring circuit. At least one of the plurality of second direction linear electrodes is selected and connected to the other end of the power supply, and the second direction linear electrode not selected is opened and current measurement is performed by the current measurement circuit. This is performed for all the second directional linear electrodes, and the leakage occurrence position of the water shielding sheet is determined based on the measurement result of the current measuring circuit.

  In particular, the plurality of second directional linear electrodes are sequentially supplied one by one while measuring the current of the first directional linear electrode that showed an increase in the current value in the current value measurement of the plurality of first directional linear electrodes. When the second direction linear electrode closest to the water leakage occurrence position is connected to the other end side of the power source, the current value flowing through the first direction linear electrode drops. By using such a current value increase characteristic and a current value drop characteristic in combination, the reliability of the detection result can be improved.

  In addition, high accuracy measurement can be performed by measuring the detection operation in the same manner by exchanging the first direction and the second direction. And since it becomes possible to effectively separate and identify leaks due to multiple damages (holes) in the water shielding sheet, the location of the leak can be detected quickly and accurately, and the occurrence of environmental pollution due to leaks is minimized. The obtained effect is great.

  As mentioned above, although this invention was demonstrated based on several embodiment, this invention is not limited to the said embodiment. For example, when the first electrode is installed on the upper side of the water-impervious sheet, the installation location is not fixed and may be installed at various locations in the disposal site as necessary. Further, a plurality of first electrodes may be installed at different disposal sites on both the upper and lower sides of the water shielding sheet so that one can be selected by a switch.

  In the water shielding sheet inspection apparatus used in the present invention, as described in FIG. 1, the first electrode is arranged on one of the upper and lower sides of the water shielding sheet, and the grid-like second on the other upper and lower sides of the water shielding sheet. It goes without saying that any disposal site having a configuration in which the linear electrode group is arranged can be applied to an existing disposal site.

A1-A5 1st direction linear electrode B1-B5 2nd direction linear electrode 10 Water shielding sheet 11 1st electrode 12 Grid-like 2nd linear electrode group 13 1st electrode switcher 14 2nd electrode switcher 30 Electrode switch 31, 32 Switch 31-1 Open terminal 31-2 Connection terminal 32-1 Current measurement terminal 32-2 Power supply connection terminal

Claims (2)

At least one first electrode provided on one of the upper and lower sides of the water shielding sheet;
N (N is an integer of 2 or more) first-direction linear electrodes extending in parallel to each other in the first direction, and M (M is a line extending in a second direction perpendicular to the first direction in parallel to each other) 2 direction linear electrode), and insulates the intersection of the first direction linear electrode and the second direction linear electrode on the other upper and lower sides of the water shielding sheet. A grid-shaped second linear electrode group, and a water leakage occurrence position detection method for detecting a water leakage occurrence position in the water shielding sheet,
A power source for applying a voltage between the first electrode and the second linear electrode group, and a current measurement circuit;
Connecting the first electrode to one end of the power source;
With all the M second direction linear electrodes open, one of the N first direction linear electrodes is selected and the other end side of the power source is passed through the current measurement circuit. And connecting the non-selected first direction linear electrode to the other end of the power source, and performing current measurement by the current measurement circuit for all the first direction linear electrodes,
If an increase in current value is detected for at least one of the first directional linear electrodes, the M number of the first directional linear electrodes are connected to the current measuring circuit. At least one of the second directional linear electrodes is selected and connected to the other end of the power source, and the current measuring circuit is configured to measure all currents with the second directional linear electrodes not selected open. A water leakage occurrence position detection method characterized by performing the second direction linear electrode and determining a water leakage occurrence position of the water shielding sheet based on a measurement result of the current measurement circuit. By performing the measurement by the current measurement circuit while sequentially switching the N first directional linear electrodes connected to the other end of the power source via the current measurement circuit, the N first first electrodes are measured. The occurrence of water leakage in the vicinity of at least one of the directional linear electrodes is determined by an increase in current value,
When it is determined that there is an increase in the current value, the connection of the first direction linear electrode connected to the current measurement circuit at that time is fixed, and the connection to the other end of the power source is performed. By sequentially measuring the M second direction linear electrodes one by one and performing the measurement by the current measuring circuit, it is possible to prevent the occurrence of water leakage in the vicinity of at least one of the M second direction linear electrodes. Judging by the decrease in value,
Based on the determination result of leakage occurrence in the vicinity of the N first directional linear electrodes and the determination result of leakage occurrence in the vicinity of the M second directional linear electrodes, the leakage occurrence position of the water shielding sheet is set to 1 The leak detection position detection method according to claim 1, wherein it is possible to determine more than a part.

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