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1. 发明专利

JPH10332522A DETECTION SYSTEM FOR WATER LEAK OCCURRENCE POSITION 失效
公开(公告)号：JPH10332522A
公开(公告)日：1998-12-18
申请号：JP14789197
申请日：1997-06-05
申请人： SAKATA DENKI KK , MAEDA CONSTRUCTION
发明人： ENDO SHINICHI , YAMAZAKI NOBUYOSHI , SAKATA FUMIO , ARAI TAKESHI
IPC分类号： G01M3/04 , G01M3/16
摘要： PROBLEM TO BE SOLVED: To provide the water leak occurrence position detection system which can precisely detect respective breakage places even if a water shield film is broken at those places. SOLUTION: One linear electrode on one side of the water shield film 10 is selected and connected to one side of an AC power source 11 and another linear electrode is selected on the other side, but other linear electrodes except the linear electrode on one side are all connected to the other side of the AC power source 11. Currents flows between the one linear electrode connected to one side of the AC power source 11 and all other linear electrodes, but a current detector 13 measures the current of only one linear electrode selected on the other side. Consequently, the current is measured while limited to nearby the intersection of the one linear electrode on one side connected to the one side of the AC power source 11 and the one linear electrode on the other side where the current measurement is taken.

2. 发明专利

JPH0886764A METHOD AND DEVICE FOR MEASURING WATER PERMEABILITY OF GROUND 失效
公开(公告)号：JPH0886764A
公开(公告)日：1996-04-02
申请号：JP22153094
申请日：1994-09-16
申请人： SAKATA DENKI KK , MAEDA CONSTRUCTION
发明人： SAKATA FUMIO , YAMAZAKI NOBUYOSHI , ARAI HITOSHI , ARAI TAKESHI
IPC分类号： E02D1/00 , G01N27/04 , G01N33/24 , G01V3/08
摘要： PURPOSE: To accurately measure the depth of any highly permeable part of a bedrock which may become a course of water. CONSTITUTION: First and second boreholes 11, 12 are provided inwards from the surface of the ground, and an alternating current is supplied between a first current-carrying electrode 13 inserted in the first borehole and a second current-carrying electrode 16 inserted in the second borehole. Third and fourth electrodes 14, 15 for measuring potential differences are provided, respectively, in positions above and below the first electrode inserted in the first borehole and are combined to provide a combination electrode. As the depths of the electrodes are varied, a potential difference is measured from the voltages detected from the third and forth electrodes, and changes in water permeability of the ground are measured from changes in polarity of the potential difference.

3. 发明专利

JPH07270108A DETECTION SYSTEM OF WATER LEAKAGE OCCURRING POSITION 失效
公开(公告)号：JPH07270108A
公开(公告)日：1995-10-20
申请号：JP6305194
申请日：1994-03-31
申请人： SAKATA DENKI KK , MAEDA CONSTRUCTION
发明人： SAKATA FUMIO , YAMAZAKI NOBUYOSHI , HATANO MASAICHIRO , ARAI HITOSHI , ARAI TAKESHI , FURUKAWA MASANORI
IPC分类号： G01B7/00 , B09B1/00 , G01D5/12 , G01M3/02 , G01M3/16
摘要： PURPOSE:To detect a water leakage occurring position at an early stage and with good sensitivity. CONSTITUTION:A detection system is provided with sheet upper-side linear electrodes A, with sheet lower-side linear electrodes B which cross them, with an AC power supply 12, with an upper-side electrode selection and changeover circuit 15 which supplies an AC voltage across both electrodes for the sheet upper-side linear electrodes, which has a first function to sequentially select the linear electrodes so as to measure the potential of every electrode and a second function to apply a voltage to, or ground, the specific linear electrode, with a lower-side electrode selection and changeover circuit 14 which has reversed the upper side and the lower side of the changeover circuit, with a high-input-impedance circuit 16 and with a phase detection circuit 17. One out of the upper-side and lower-side electrode selection and changeover circuits is provided with the first function, the other is provided with the second function, and the coordinates of a leakage-of-water generated position in one direction are found. Then, the coordinates of a leakage-of-water generated position in the other direction are found in an opposite manner to it, and a position which is found by the two coordinates is regarded as the leakage-of-water generated position in a water shutoff sheet.

4. 发明专利

JPH0915080A WATER LEAK POSITION DETECTOR 失效
公开(公告)号：JPH0915080A
公开(公告)日：1997-01-17
申请号：JP15960795
申请日：1995-06-26
申请人： SAKATA DENKI KK , MAEDA CONSTRUCTION
发明人： SAKATA FUMIO , YAMAZAKI NOBUYOSHI , ARAI HITOSHI , ARAI TAKESHI
IPC分类号： G01M3/16 , B09B1/00
摘要： PURPOSE: To obtain a water leak position detector which can detect a damaged part and determine the extent of damage. CONSTITUTION: An electrode switch 12 selects one of a plurality of first electrodes 11 embedded in a part to be processed and then an AC voltage is applied sequentially from an AC power supply 14 between the selected first electrode and a second electrode 13 embedded on the outside of a water sealing sheet 17. A current detection circuit 15 detects a current flowing between the selected first electrode and the second electrode. A phase detection circuit 16 detects the phase of output signal from the current detection circuit with the phase of AC voltage as reference. In other words, the first electrode switch selects the first electrode sequentially and the phase is detected for the current flowing between the selected first electrode and the second electrode and the water leak position is detected based on the fact that the current flowing between a combination of electrodes, close to a leaked point of water sealing sheet, increases as compared with the current flowing between other electrodes.

5. 发明专利

JPH0552699A DETECTION OF WATER LEAKAGE OCCURRING POINT 失效
公开(公告)号：JPH0552699A
公开(公告)日：1993-03-02
申请号：JP23369691
申请日：1991-08-22
申请人： MAEDA CONSTRUCTION , SAKATA DENKI KK
发明人： ARAI HITOSHI , ARAI TAKESHI , SAKATA FUMIO , YAMAZAKI NOBUYOSHI
IPC分类号： G01M3/16 , G01M3/02
摘要： PURPOSE:To detect a water leakage occurring point at early stage with good sensitivity by carrying out phase detection of inter-electrode current passing a selection switching circuit for each wire-shaped electrode, and by determining a point where the polarity of a difference value of the detected output value is reversed. CONSTITUTION:Wire-shaped electrodes B1-B5 on the lower side of a water-barrier film 11 are energized by a lower part selection switching circuit 16, while wire-shaped electrodes A1-A5 on the upper side of the water-barrier film 11 are selected and are energized by an upper part selection switching circuit 15. When there is a defect in the water-barrier film 11, since current is easily run at the defective point, a phase detection output indicates maximum value when the wire-shaped electrode that is the closest to the defective point is selected. The polarity of the difference value of the phase detection output when the electrode in the proximity is selected, is reversed with an electrode, the detection output of which is of maximum level, on the boundary, and the reversed point indicates the coordinate of the defective point in the direction of the electrodes A1-A5. All of the electrodes A1-A5 are energized by the circuit 15, while the electrodes B1-B5 are switched in order, so as to determine the coordinate of the defective point in the direction of the electrodes B1-B5, and the two coordinate points are judged to be a defective point.

6. 发明专利

JPH09280992A DETECTING SYSTEM FOR LEAKAGE OCCURRENCE POSITION 失效
公开(公告)号：JPH09280992A
公开(公告)日：1997-10-31
申请号：JP9502496
申请日：1996-04-17
申请人： SAKATA DENKI KK , MAEDA CONSTRUCTION
发明人： YAMAZAKI NOBUYOSHI , SAKATA FUMIO , ARAI HITOSHI , ARAI TAKESHI
IPC分类号： G01M3/02 , G01M3/04 , G01M3/16
摘要： PROBLEM TO BE SOLVED: To provide a detecting system for leakage occurrence position capable of accurately detecting leakage occurrence position in a short time in a management type wastewater treatment plant. SOLUTION: Sets of wire electrodes A1 to A5, B1 to B5 of upstream and downstream of a water shielding film 10 are sequentially selected, and the current flowing between the electrodes of each set is phase detected by the same phase as or 90-degree different phase from the two-phase AC power source 15 by first and second phase detectors 16, 17. A squaring circuit 18 receives the output of the detector 16, outputs the square value. A divider 19 divides the output from the circuit 18 as a numerator by the output from the detector 17 as a denominator. As a result, in the case of the combination of the electrode near the leakage occurrence position due to the damage of the film 10, the output of the divider 19 is raised from the value between the other electrodes, thereby detecting the leakage occurrence position.

7. 发明专利

JPH07151633A WATER LEAK POINT DETECTOR 失效
公开(公告)号：JPH07151633A
公开(公告)日：1995-06-16
申请号：JP29969393
申请日：1993-11-30
申请人： SAKATA DENKI KK , MAEDA CONSTRUCTION
发明人： SAKATA FUMIO , YAMAZAKI NOBUYOSHI , HATANO MASAICHIRO , ARAI HITOSHI , ARAI TAKESHI , FURUKAWA MASANORI
IPC分类号： G01M3/02 , G01M3/16
摘要： PURPOSE:To provide a detector for detecting a damaged part of a water barrier sheet accurately. CONSTITUTION:The water leak point detector comprises an upper electrode switching circuit 15 for selecting three continuous wire electrodes sequentially from an upper wire electrodes A and applying AC voltage from an AC power supply 12 to the central electrode whereas connecting two wires independently with the electrodes on the opposite sides, a similar lower electrode switching circuit 16, a circuit 14 for detecting the potential difference between adjacent electrodes directly, a circuit 17 for detecting the phase of an output from the circuit 14, and means 19 for operating a series of potential difference detection output values. The coordinates of a water leak point 20 is determined based on the position where the polarity of the series of potential difference detection output values is inverted.

8. 发明专利

JPH04136732A DETECTING SYSTEM OF POSITION OF OCCURRENCE OF WATER LEAKAGE 失效
公开(公告)号：JPH04136732A
公开(公告)日：1992-05-11
申请号：JP25717890
申请日：1990-09-28
申请人： MAEDA CONSTRUCTION , SAKATA DENKI KK
发明人： ARAI HITOSHI , ARAI TAKESHI , SAKATA FUMIO , YAMAZAKI NOBUYOSHI
IPC分类号： G01M3/16
摘要： PURPOSE:To detect the position of a breakdown of a water barrier film in a short time by a system wherein wire electrodes crossing each other are provided on the upper and lower sides of the water barrier film, the upper and lower electrodes are selected sequentially and electrified and the electrification current is subjected to phase detection synchronously with outputs of a two-phase AC power source which are different in phase by 90 degrees from each other. CONSTITUTION:Wire electrodes A1 to A5 are disposed on the upper side of a water barrier film 10, while wire electrodes B1 to B5 are disposed on the lower side of the film so that they cross the electrodes on the upper side. One output of a two-phase AC power source 11 is impressed on one electrode selected from the ones A1 to A5 through an SW selector 14, and the other is impressed on one electrode selected from the ones B1 to B5 through an SW selector 15. When the water barrier film is broken, a first phase detection circuit 16a outputs a relatively large value when the crossing point of a combination of the wire electrodes on the upper and lower sides of the water barrier film is near to the broken part, and a second phase detection circuit 16b outputs a relatively small value on the occasion. By displaying a difference between the output values of the two phase detection circuits, accordingly, the position of occurrence of a water leakage can be known.

9. 发明专利

JPH04136731A DETECTING SYSTEM OF POSITION OF OCCURRENCE OF WATER LEAKAGE 失效
公开(公告)号：JPH04136731A
公开(公告)日：1992-05-11
申请号：JP25717790
申请日：1990-09-28
申请人： MAEDA CONSTRUCTION , SAKATA DENKI KK
发明人： ARAI HITOSHI , ARAI TAKESHI , SAKATA FUMIO , YAMAZAKI NOBUYOSHI
IPC分类号： G01M3/16
摘要： PURPOSE:To enable calibration of the sensitivity of current measurement by short-circuiting metal plate electrodes on the upper and lower sides of a water barrier film by a switch operation on the occasion when a current flowing between upper and lower electrodes is measured. CONSTITUTION:Metal plate electrodes 20 comprise four upper metal plate electrode pieces 20a and four lower metal plate electrode pieces 20b opposed thereto, and a switch box 19 also comprises four switches which can short-circuit four couples of the metal plate electrode pieces discretely. When one switch is made to cause a short circuit, a resistance between the metal plate electrode pieces 20a and 20b opposed to each other turns zero, and therefore a state being similar to a breakage of a water barrier film 10 is brought forth electrically by the area of one metal plate electrode piece. When two switches are made to cause the short circuit, a state similar to a breakage corresponding to two of the metal plate electrode pieces is brought forth, and so on. Accordingly, the degree of a water leakage to which a measure value obtained from an output of a current detecting circuit 13 and an output of a phase detection circuit 16 corresponds actually can be determined with high precision.

10. 发明专利

JPH04136730A DETECTING SYSTEM FOR POSITION OF OCCURRENCE OF WATER LEAKAGE 失效
公开(公告)号：JPH04136730A
公开(公告)日：1992-05-11
申请号：JP25717690
申请日：1990-09-28
申请人： MAEDA CONSTRUCTION , SAKATA DENKI KK
发明人： ARAI HITOSHI , ARAI TAKESHI , SAKATA FUMIO , YAMAZAKI NOBUYOSHI
IPC分类号： G01M3/02 , G01M3/04 , G01M3/16
摘要： PURPOSE:To detect the position of a breakdown of a water barrier film in a short time by a system wherein wire electrodes crossing each other are provided on the upper and lower sides of the water barrier film, the upper and lower electrodes are selected sequentially and electrified and a current output value between the separate electrodes is displayed. CONSTITUTION:Wire electrodes A1 to A5 are disposed on the upper side of a water barrier film 10, while wire electrodes B1 to B5 are disposed on the lower side thereof so that they cross the above electrodes. One output of an AC power source 11 is impressed on one wire electrode selected from the ones A1 to A5 through an SW selector 14, and the other is impressed on one electrode selected from wire electrodes B1 to B5 through an SW selector 15. When the water barrier film is broken, a current tends to flow through the broken part easily. When the crossing point of a combination of the upper and lower wire electrodes is near to the broken part, accordingly, a phase detection circuit 16 outputs a relatively larger value for it than the one for other combinations of the electrodes. By displaying the output value of the phase detection circuit in accordance with the crossing point of the electrodes on the upper and lower sides of the water barrier film, accordingly, the position of occurrence of a water leakage can be known.

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