JP6530339B2 - Water leakage location detection method - Google Patents

Description

The present invention relates to a method of detecting a water leakage occurrence position in a controlled final disposal site constructed by laying a synthetic resin or synthetic rubber sheet or a water-impervious sheet such as asphalt.

  Conventionally, in an artificial control type final disposal site constructed by laying a water blocking sheet in a built-up depression, damage such as a crack occurs in the water blocking sheet in the ground after the waste is carried in, and the inside of the disposal site Water leakage is not desirable. If a leak occurs, it may cause groundwater contamination if the leak contains pollutants, so the water control sheet is regularly checked at the controlled final disposal site. One of the inspection operations of the water blocking sheet is an operation of electrically detecting the occurrence of water leakage and its position. In this inspection work, when the occurrence and position of water leakage are detected, the relevant site of the disposal site is dug up and appropriate repair is performed on the water blocking sheet.

  Various methods are known as a method of detecting the occurrence of water leakage in such a water blocking sheet. A first example of the conventional method is described in FIG. 3 of Patent Document 1 as a water leakage occurrence position detection method, and will be described with reference to FIG.

  In FIG. 6, the water leakage occurrence position detection method according to the first example is applied to a controlled final disposal site constructed by laying the water blocking sheet 100. In this example, a plurality (five in this case) of upper linear electrodes A1 to A5 are arranged in parallel above the water blocking sheet 100, and a plurality of upper linear electrodes A1 to A5 are disposed below the water blocking sheet 100. A plurality of (five in this case) lower side linear electrodes B1 to B5 are arranged in parallel so as to intersect 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 in an open state. The lower electrode switch 120 is connected to one end of the lower linear electrodes B1 to B5, and the other end is in an open state.

  The upper electrode switch 110 selects one of the upper linear electrodes A1 to A5 and connects it to one end of the AC power source 130. The lower electrode switch 120 selects one of the lower linear electrodes B1 to B5 and connects it to the other end of the AC power supply 130 via the current measurement circuit 140.

  The 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 take out the output.

  In the leak detection position detection method according to the first example, one upper linear electrode selected by the upper electrode switch 110 (A3 in FIG. 6) and one lower linear shape selected by the lower electrode switch 120 An alternating voltage from the alternating current power supply 130 is applied between the electrode and the electrode (B4 in FIG. 6), and the current flowing between the upper and lower electrodes is measured by the current measurement circuit 140. This current measurement is performed while sequentially switching the upper linear electrode selected by the upper electrode switch 110 and the lower linear electrode selected by the lower electrode switch 120 one by one. The synchronous detection circuit 150 performs synchronous detection on the output of the current measurement circuit 140 with the phase of the applied voltage. In the synchronous detection, if the current having the same phase as the applied voltage is increased, it is determined that there is water leakage around the combination point 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 leakage occurrence position detection method, and will be described with reference to FIG.

  In FIG. 7, the water leakage position detection method according to the second example is applied to a control-type final disposal site constructed by laying a water shielding sheet 200. In this example, a plate or rod-shaped first electrode 210 is installed on either upper or lower side of the water-impervious sheet 200, and a grid-like second linear shape is installed on the other upper or lower side of the water-impervious sheet 200. An electrode group 220 is installed. The second linear electrode group 220 has a plurality (five in this case) of first direction linear electrodes A1 to A5 and a plurality (five here) of second direction linear electrodes B1 to B5 in a lattice shape. As well as arranging them, they are insulated at their intersections.

  The first electrode 210 is connected to one end of the AC power supply 230. An 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 in an open state.

  In the present embodiment, the electrode switch 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 via the current measurement circuit 250. It has a function of connecting to the other end side of the AC power supply 230 and connecting all the selected first direction linear electrodes and second direction linear electrodes to the other end side of the AC power supply 230.

  The synchronous detection circuit 260 is connected to one end of the AC power supply 230 and the output of the current measurement circuit 250 to take out the output.

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

Unexamined-Japanese-Patent No. 11-248590 gazette

  The water leakage occurrence position detection method according to the first example has a drawback that the measurement time is long because it is necessary to measure all the electrode intersections at each of the electrode intersections above and below the water blocking sheet.

  On the other hand, in the water leakage occurrence position detection method according to the second example, the 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 blocking sheet. . In this leak detection position detection method, as described later, when a plurality of leaks are generated in the water-impervious sheet, there is a drawback that the leak locations can not be accurately separated and detected. That is, in this water leakage occurrence position detection method, when a plurality of water leakage is generated in the water blocking sheet, ghosts are generated and the candidates of the water leakage position are increased. Therefore, the measurement results using other measuring means In addition, there is a disadvantage that the work of separating a plurality of water leakage positions is required.

The present invention has been made to solve the above-mentioned drawbacks, and even when water leakage occurs at a plurality of locations of the water-impervious sheet, not only the separation of the water leakage location but also the degree of breakage, that is, An object of the present invention is to provide a method for detecting a position at which a water leakage is generated, which can also detect the degree of water leakage.

According to the aspect of the present invention, at least one first electrode provided on one side of the upper and lower sides of the water-impervious sheet, and N pieces extending in the first direction parallel to each other (N is an integer of 2 or more) A first direction linear electrode, and M (where M is an integer of 2 or more) second direction linear electrodes extending parallel to each other and orthogonal to the first direction; Using a grid-like second linear electrode group formed by insulating the intersections of the one-directional linear electrode and the second-directional linear electrode and arranging them on the other upper and lower sides of the water-impervious sheet A method for detecting a position at which water leakage occurs in the water-impervious sheet, comprising: a power supply for applying a voltage between the first electrode and the second linear electrode group; and a current measurement circuit , And the first electrode is connected to one end of the power supply, and the M second directional linear electrodes are all opened. Select one of the N first direction linear electrodes and connect it to the other end of the power supply via the current measurement circuit and select the non-selected first direction linear electrodes. The other end of the power supply is connected to perform current measurement by the current measurement circuit 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. In the case where the at least one first direction linear electrode is connected to the current measuring circuit, at least one of the M second The second direction linear electrode connected to the other end side and not selected is open, and current measurement by the current measurement circuit is performed on all the second direction linear electrodes, based on the measurement result of the current measurement circuit. Leakage of the water blocking sheet Leak occurrence position detecting method characterized by determining the occurrence position is provided.

  According to the present invention, even when a plurality of water leaks are generated in the water-impervious sheet, it is possible to effectively separate and identify a plurality of water leak locations, so the water leak occurrence position can be made early. It can detect correctly. Moreover, since it is not necessary to measure all the electrode intersections of the grid-like linear electrode group arrange | positioned at any one of the upper and lower sides of a water-impervious sheet, it is effective in the measurement time becoming short.

It is a figure for describing a 1st embodiment of a leak detection position detection system by the present invention. It is a figure for demonstrating the case where the water leak of several places is detected by the water leak generation position detection system of 1st Embodiment. It is a figure for demonstrating 2nd Embodiment of the water leak generation position detection system by this invention. It is a figure for describing 3rd Embodiment of the water leak generation 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 to 5, several embodiments of a water leakage position detection method according to the present invention and a water blocking sheet inspection apparatus used therefor will be described.

  FIG. 1 is a diagram showing the configuration of the first embodiment of the present invention. In the present embodiment, the plate-like or rod-like first electrode 11 is disposed on the upper side of the water-impervious sheet 10 laid in the control-type final disposal site, and the intersection portion is insulated at the lower side of the water-impermeable sheet 10 A grid-like second linear electrode group 12 is disposed. The second linear electrode group 12 includes N (here, five) first direction linear electrodes A1 to A5 extending parallel to one another in the first direction, and second ones parallel to one another and orthogonal to the first direction. And M (here five) 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 reversed, that is, the first electrode 11 is below the water blocking sheet 10, and the second linear electrode group 12 is above the water blocking sheet 10. You may arrange each in. Further, the number N of first direction linear electrodes and the number M of second direction linear electrodes may be integers of 2 or more, respectively, 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 installation of the water blocking sheet 10. One end side of the first electrode 11 and the second linear electrode group 12 may be collectively taken out by an insulated cable and led out to one place so that the electrical connection with the water blocking sheet inspection device to be described later becomes easy. desirable.

  In the present embodiment, the water blocking 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 case and carried to the work site when the water blocking sheet 10 is checked.

  The first electrode 11 is connected to one end of an AC power supply 15. The first electrode switch 13 is connected to one end side of the first direction linear electrodes A1 to A5, and the other end side is open. The second electrode switch 14 is connected to one end side of the second direction linear electrodes B1 to B5, and the other end side is open. Therefore, in the water blocking 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 direction 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 direction linear electrodes B1 to B5.

  The first electrode switch 13 has five switches corresponding to the number of first direction linear electrodes A1 to A5, and one of the first direction linear electrodes A1 to A5 is connected to the current measuring circuit 16 It has a switching function that can be connected to the other end of the AC power supply 15 via the other, and one end of the remaining first direction linear electrodes A1 to A5 can be connected to the other end of the AC power supply 15 as it is. This switching function allows the current measuring circuit 16 to measure the current flowing in the selected first direction linear electrode.

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

  FIG. 1 also shows that water leakage due to breakage (a hole) of the water-impervious 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 direction linear electrodes connected to the current measurement circuit 16 are sequentially switched one by one by the first electrode switch 13, the current from the first electrode 11 is most likely to be leaked to the water leakage point. Since many flow into the near first direction linear electrode A3, if the leakage of water from the water-impermeable sheet 10 is in the vicinity of the first direction linear electrode A3 due to the measurement result of the current measurement circuit 16, that is, the increase of the current value. It can be determined. The above detection operation is referred to as the first step detection operation.

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

  In the detection operation of the second step, the current from the first electrode 11 also flows much into the second direction linear electrode B3 closest to the water leakage point, so the current value flowing into the first direction linear electrode A3 is relative The phenomenon of falling suddenly occurs. Thereby, it can be determined that water leakage due to breakage of the water blocking sheet 10 is in the vicinity of the second direction linear electrode B3.

  On the basis of the determination result of the detection operation of the first step and the determination result of the detection operation of the second step, the water leakage due to the damage of the water blocking sheet 10 is the first direction linear electrode A3 and the second direction linear electrode B3. It can be determined that it exists near the intersection of

  The degree of water leakage is regarded as the degree of breakage of the water-impervious sheet (size of the hole) by knowing the amount of increase of the current value in the detection operation of the first step and the decrease amount of the current value in the detection operation of the second step. It can be grasped.

  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. However, 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 achieve the same effect even if the first direction and the second direction are interchanged. That is, even if the combination of the first electrode switch 13 and the current measurement 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. By switching the connection in this way and performing the same detection operation of the first step and the detection operation of the second step as described above, the detection accuracy of the water leakage occurrence position can be improved. In particular, by using the water blocking sheet inspection device provided with the above-mentioned external connection terminal, such switching of connection can be easily realized simply by switching the connection to the external connection terminal of the water blocking sheet inspection device. Can.

  Although an alternating current ammeter is used as the current measurement circuit 16 in the present embodiment, a direct current power supply can be used instead of the alternating current power supply 15. In this case, it goes without saying that a direct current ammeter is used for the current measurement circuit 16. As described above, regarding the arrangement of the first electrode 11 and the grid-like second linear electrode group 12, the vertical relationship of the water-impervious sheet 10 shows the same effect regardless of which arrangement. In addition, the impermeable sheet may be a double structure. In this case, the grid-like second linear electrode group is disposed in the middle layer of the double-layered water-impervious sheet, and the first upper and lower water-impervious sheets are respectively provided with the first linear electrode group. By arranging the electrodes, it is possible to detect the water leakage occurrence position in the upper side water blocking sheet and the lower side water blocking sheet of the double-layered water blocking sheet.

  FIG. 2 is a view for explaining a case where water leakage at a plurality of locations (two locations here) generated in the water-impervious sheet is detected using the configuration described in FIG. 1.

  In FIG. 2, the upper and lower electrode arrangement of the water blocking sheet 10 and the water blocking sheet inspection apparatus are the same as the configuration shown in FIG. 1. It is assumed that water leakage is caused in the water blocking sheet 10 due to two damage (holes). In this case, in the water leakage occurrence position detection method described in FIG. 7, the first direction linear electrode A2 and the second direction linear electrode B4 are located near the intersection of the first direction linear electrode A2 and the second direction linear electrode B2. Water leakage due to damage at a total of four locations near the intersection, near the intersection of the first direction linear electrode A5 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 Results in being detected. However, the water 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 water leakage. It is called a ghost, not a place where

  On the other hand, in the present 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 second step detection operation, with the first electrode switch 13 fixing the connection of the first direction linear electrode A2 to the current measurement circuit 16, the second electrode switch 14 performs the second direction linear electrode. Even if B2 is connected to the other end of the AC power supply 15, a drop in the current value in the current measurement circuit 16 does not occur. Similarly, with the first electrode switch 13 fixing the connection of the first direction linear electrode A 5 to the current measurement circuit 16, the second electrode switch 14 switches the second direction linear electrode B 4 to the AC power supply 15. Even when connected to the end side, there is no drop in the current value in the current measurement circuit 16.

  On the other hand, with the first electrode switch 13 fixing the connection of the first direction linear electrode A2 to the current measurement circuit 16, the second electrode switch 14 controls the second direction linear electrode B4 at the other end of the AC power supply 15. When connected to the side, a drop in the current value in the current measurement circuit 16 occurs for the reason described in the first embodiment. Similarly, with the first electrode switch 13 fixing the connection of the first direction linear electrode A 5 to the current measurement circuit 16, the second electrode switch 14 switches the second direction linear electrode B 2 to the AC power supply 15. When connected to the end side, a drop in the current value in the current measurement circuit 16 occurs. Thereby, the water leakage due to damage (a hole) of the water-impervious sheet 10 is observed in the vicinity of the intersection of the first direction linear electrode A2 and the second direction linear electrode B4 and in 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 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. The present embodiment is different from the first embodiment in that the 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. The point is that the current value synchronized with the applied voltage is measured by detection. According to the second embodiment, the effect of the current flowing through the capacity component of the water blocking sheet 10 can be eliminated by synchronous detection.

  FIG. 4 is a diagram showing the configuration of the third 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. The difference of the present embodiment from the second embodiment is that the water blocking sheet inspection apparatus further performs switching control of the five switches in the first electrode switch 13 and the second electrode switch 14. 19, a processing unit 20 that processes the output of the synchronous detection circuit 18 to determine the location of water leakage in the water blocking sheet 10, and a display unit 21 that displays the processing result of the processing unit 20.

  The switching control unit 19 reads out the program from the memory and stores the program for performing switching control operation by storing a program for executing a predetermined switching control operation in the first electrode switching device 13 and the second electrode switching device 14. It includes a CPU (Central Processing Unit) to be executed.

  A signal output from the synchronous detection circuit 18 in accordance with the switching control operation of the first electrode switching device 13 and the second electrode switching device 14 is converted to a digital signal and sent to the processing unit 20. The processing unit 20 can also be realized by a personal computer (PC), in particular, a portable PC.

  Similar to FIG. 1, it is assumed that water leakage due to damage (a hole) of the water blocking sheet 10 is generated 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 direction linear electrode A3 exceeds the predetermined first threshold value from the signal obtained through the synchronous detection circuit 18 in the detection operation of the first step described in FIG. Determine and store this.

  Next, the processing unit 20 determines that the current value obtained through the second direction linear electrode B3 exceeds the predetermined second threshold value from the signal obtained through the synchronous detection circuit 18 in the detection operation of the second step described in FIG. Decide to go down and store it.

  Subsequently, the processing unit 20 determines, based on the above-mentioned storage result, that water leakage due to damage to the water-impervious sheet 10 is present near the intersection of the first direction linear electrode A3 and the second direction linear electrode B3. It is displayed on the display unit 21. The display unit 21 displays the water leakage occurrence position in the water-impervious sheet 10 with coordinates, but in addition to displaying a plan view of the grid-like second linear electrode group 12, for example, the water leakage occurrence position You may make it overlap and display it.

  It goes without saying that the various modifications described in the first embodiment are also applied to the second and third embodiments.

  FIG. 5 shows an example of the 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, the case where the first direction linear electrodes are three of A1, A2 and A3 and the second direction linear electrodes are also three of B1, B2 and B3 will be described. .

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

  In the first embodiment of FIG. 1, it is assumed that water leakage due to breakage (a hole) of the water-impervious sheet 10 is generated 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 direction linear electrodes A1 to A3 to the connection terminal 31-2, and the fourth The sixth switch 31 connects all the second direction linear electrodes B1 to B3 to the open 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 one of the first direction linear electrodes A1 to A3, and the connection terminal 31- It connects to the terminal 32-1 for current measurement through 2, and connects the remainder of 1st direction linear electrode A1-A3 to the terminal 32-2 for power supply connection through the terminal 31-2 for connection. Thus, 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 the predetermined first threshold is detected in the first direction linear electrode A3.

  As described in FIG. 1, in the detection operation of the second step, the first direction linear electrodes A 1 and A 2 are connected to the other end side of the AC power supply 15, and the first direction linear electrode A 3 is connected to the current measurement 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 to connect one of the second direction linear electrodes B1 to B3 to the connection terminal 31. , 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 first stage electrode switching unit is switched to be connected to the power supply connection terminal 32-2. The switches other than the one switch of the second stage electrode switching unit remain connected to the current measurement terminal 32-1.

  Thus, the second direction linear electrodes B1 to B3 are sequentially connected to the other end side 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 in FIG. 1, a current value falling below the predetermined second threshold value is detected in the second direction linear electrode B3.

  Needless to say, the switching as described above can also be realized by the switching control unit 19 described with reference to FIG.

  The electrode switch 30 connects the combination of the first electrode switch 13 and the current measurement circuit 16 described in the first embodiment to the second direction linear electrodes B1 to B5, and the second electrode switch A switch can also be realized to connect the first 14 to the first direction linear electrodes A1 to A5.

(Effect of the embodiment)
As apparent 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 blocking sheet, and the 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 the intersection point of the first direction linear electrode and the second direction linear electrode A water leakage occurrence position detection method for detecting a water leakage occurrence position in the water shielding sheet by using a grid-like second linear electrode group which is insulated and disposed on the lower side (or upper side) of the water shielding sheet Is provided.

  In this leak detection position detection method, a power supply for applying a voltage between the first electrode and the second linear electrode group and a current measurement circuit are prepared, and one end of the power supply is provided. The first electrode is connected. Then, one of the plurality of first direction linear electrodes is selected in a state where all of the plurality of second direction linear electrodes are opened, and the other end side of the power supply is passed through the current measurement circuit. And the non-selected first direction linear electrode is connected to the other end side of the power supply, and the current measurement by the current measurement circuit is performed on 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 measurement circuit. At least one of the plurality of second direction linear electrodes is selected and connected to the other end side of the power supply, and the non-selected second direction linear electrodes are open and measure the current by the current measurement circuit. The present invention is carried out for all the second direction linear electrodes, and the water leakage occurrence position of the water blocking sheet is determined based on the measurement result of the current measurement circuit.

  In particular, while measuring the current of the first direction linear electrode showing an increase in the current value in the measurement of the current value of the plurality of first direction linear electrodes, the power of the plurality of second direction linear electrodes is sequentially supplied one by one When the second direction linear electrode closest to the water leakage occurrence position is connected to the other end side of the power supply, the current value flowing through the first direction linear electrode drops. The reliability improvement of a detection result can be aimed at by combining such a current value increase characteristic and a current value fall characteristic.

  In addition, measurement can be performed with high accuracy by performing the measurement in the same manner by exchanging the first direction and the second direction. And since it becomes possible to separate and identify the water leakage by a plurality of damages (pores) in the water-impervious sheet effectively, the position of the water leakage can be detected early and the occurrence of environmental pollution due to the water leakage is minimized. The effect obtained 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 place is not fixed, and may be installed at various places of the disposal site as needed. Further, the plurality of first electrodes may be respectively installed at different places of the disposal site on the upper and lower sides of the water-impervious sheet so that one can be selected by the switch.

  In the water blocking sheet inspection apparatus used in the present invention, the first electrode is disposed on one of the upper and lower ones of the water blocking sheets as described in FIG. It goes without saying that the present invention is applicable to an existing disposal site, as long as the disposal site has a configuration in which the linear electrode group is arranged.

A1 to A5 first direction linear electrode B1 to B5 second direction linear electrode 10 water impermeable sheet 11 first electrode 12 lattice-shaped second linear electrode group 13 first electrode switch 14 second electrode switch Reference Signs List 30 electrode switching device 31, 32 switching device 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 side above and below the water blocking sheet,
N (N is an integer of 2 or more) first direction linear electrodes extending parallel to each other in the first direction, and M lines extending parallel to each other in the second direction orthogonal to the first direction And a second direction linear electrode, and insulating the intersection of the first direction linear electrode and the second direction linear electrode on the other side of the upper and lower sides of the water-impervious sheet It is a water leak occurrence position detection method for detecting a water leak occurrence position in the water-impervious sheet by using a grid-like second linear electrode group which is disposed,
Preparing a power supply for applying a voltage between the first electrode and the second linear electrode group, and a current measurement circuit;
The first electrode is connected to one end of the power supply,
One of the N first direction linear electrodes is selected in a state where all the M second direction linear electrodes are open, and the other end side of the power supply is passed through the current measurement circuit. And the non-selected first direction linear electrode is connected to the other end of the power supply, and current measurement by the current measurement circuit is performed on all the first direction linear electrodes;
When an increase in current value is detected for at least one of the first direction linear electrodes, the M lines of the at least one first direction linear electrode are connected to the current measurement circuit. At least one of the second direction linear electrodes is selected and connected to the other end side of the power supply, and the non-selected second direction linear electrodes are open, and the current measurement circuit performs the current measurement by all the current measurement circuits. A method for detecting a water leakage occurrence position, performed on the second direction linear electrode, and determining a water leakage occurrence position of the water blocking sheet based on a measurement result of the current measurement circuit. The N first measurement signals are measured by the current measurement circuit while sequentially switching the N first direction linear electrodes connected to the other end side of the power supply via the current measurement circuit one by one. The occurrence of leakage in the vicinity of at least one of the directional linear electrodes is determined by the increase of the current value,
When it is determined that there is an increase in the current value, the connection is made to the other end of the power supply in a state in which the connection of the first direction linear electrode connected to the current measurement circuit is fixed at that time. By performing measurement with the current measurement circuit while sequentially switching M second direction linear electrodes one by one, it is possible to measure the occurrence of leakage in the vicinity of at least one of the M second direction linear electrodes. Determined by the decrease in value,
The water leakage occurrence position of the water blocking sheet is 1 based on the determination result of water leakage occurrence near the N first direction linear electrodes and the determination result of water leakage occurrence near the M second direction linear electrodes The method for detecting a water leakage occurrence position according to claim 1, characterized in that determination is possible for more than a location.

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