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1. 发明专利

JPS6468614A METHOD AND DEVICE FOR SEATING SENSOR RACK ON SEA BOTTOM 失效
公开(公告)号：JPS6468614A
公开(公告)日：1989-03-14
申请号：JP22529487
申请日：1987-09-10
申请人： TOKYO GAS CO LTD , TOA HARBOR WORKS CO LTD , NEC CORP
发明人： YAMAGUCHI KENICHI , SUGIMOTO KUNIAKI , NUMAJIRI YOSHIHARU , YAMAUCHI FUMIO
IPC分类号： G01D21/00 , G01C13/00
摘要： PURPOSE:To accurately measure the position of a submarine buried body by lowering the sensor rack provided with a sensor on the bottom of the sea along a guide rope, adjusting the position of the rack by moving a davit over confirmation through a radio wave position measuring instrument antenna provided to a davit coupling bar, and then seating it on the bottom of the sea. CONSTITUTION:The guide rope 13 of an anchor block 22 is lowered on the bottom 1 of the sea through the operation of the winch 9 of the block 22 of a measurement ship 11 and after front and rear blocks are seated on the bottom 1 of the sea, the blocks are seated on the bottom 1 of the sea at the same time at intervals of 0.5m to maintain a guide rope interval L. Then the sensor rack 3 is lowered on the bottom 1 of the sea by a rope 14 along the guide rope 13 through the operation of the winch 8 and the ropes 13 and 14 are loosened. Further, a sensor cable 15 connected to a magnetic sensor 4 is elevated and lowered by a cable winding device 16. The position of a submarine tube 2 is measured after the sensor rack 3 is set, and if there is a deviation between the center part 3A of the sensor rack 3 and the center line C of the submarine tube 2, the center part 3A is moved until it meets the center line C and a measurement is taken again.

2. 发明专利

JPS62297776A POSITION DETECTING METHOD FOR BURIED CONDUCTOR 失效
公开(公告)号：JPS62297776A
公开(公告)日：1987-12-24
申请号：JP14174086
申请日：1986-06-17
申请人： NEC CORP , TOKYO GAS CO LTD
发明人： MIURA TOKUNORI , SAITO KIMIMASA , WASA YASUHIRO , YAMAGUCHI KENICHI
IPC分类号： G01B7/00 , G01R33/02 , G01V3/08
摘要： PURPOSE:To improve the detection accuracy of a burying position and to evaluate the reliability of the detection result by obtaining plural data on a line of intersection of two planes crossing a magnetic field at right angles and calculating their mean value with respect to all combinations of two points on both sides of the rack center of magnetic sensors fixed both ends of a rack. CONSTITUTION:Plural magnetic sensors which detect a magnetic field direction are fixed on substantially the same plane nearby both ends of the long rack 3, which this rack 3 is installed on the ground surface closely right above a buried conductor for a method which supplies a current to the buried conductor 1 to find its position. Then, the magnetic field direction is measured at plural positions on the ground surface and data on lines of intersection of two planes crossing the magnetic field at right angles are found with respect to all combinations of two points on both sides of the rack center of the magnetic sensors fixed nearby both ends of the rack. Then their mean value is calculated to obtain the measurement position of the burying position with high reliability, and variance in the measurement result (e.g. standard deviation) is found to evaluate the reliability.

3. 发明专利

JPS62297777A POSITION DETECTING METHOD FOR BURIED CONDUCTOR 失效
公开(公告)号：JPS62297777A
公开(公告)日：1987-12-24
申请号：JP14174186
申请日：1986-06-17
申请人： NEC CORP , TOKYO GAS CO LTD
发明人： MIURA TOKUNORI , SAITO KIMIMASA , WASA YASUHIRO , YAMAGUCHI KENICHI
IPC分类号： G01V3/10
摘要： PURPOSE:To detect the position of a buried conductor in a short time by an easy procedure by measuring the intensity and direction of a magnetic field at >=3 points where relative positions on a plane are clear, and calculating the burying position from the optimum value of a constant of a theoretical expression of the magnetic field intensity calculated by using said measured values. CONSTITUTION:A current is supplied to the buried conductor 1 and a magnetic field produced by the current is measured by using a three-axial fluxmeter. Then, the two axes of the fluxmeter are placed on an optional plane and the fluxmeter is moved in the direction of an (x)-axia direction by (n) times (n>=3) by every specific distance to measure three axial components of a magnetic field at respective points Xn, thereby obtaining (n) measurement results (Xn HnX, Hny, Hnz). The intensity Hn and direction theta of the magnetic field at each measurement point Xn are found from a prescribed expression by using the measurement results. Then, those measured values are used to calculate the optimum value of the constant of a theoretical expression of the magnetic field intensity and the burying position of the buried conductor 1 is calculated from the prescribed expression by using the constant value.

4. 发明专利

JPS6439388A METHOD FOR PREVENTING ELECTROLYTIC CORROSION OF BURIED PIPE BY MULTIPLE ELECTRIC POTENTIAL CONTROL 失效
公开(公告)号：JPS6439388A
公开(公告)日：1989-02-09
申请号：JP19459487
申请日：1987-08-04
申请人： TOKYO GAS CO LTD , NIPPON BOSHOKU KOGYO KK
发明人： YAMAGUCHI KENICHI , ARAI MINORU , TOYODA SHIGERU
IPC分类号： C23F13/00
摘要： PURPOSE:To prevent the electrolytic corrosion with a single electric power source by operating the collation electrode group and galvanic electrode group set along the buried pipes to be prevented from corrosion of plural structures such as an electric railway by the automatic constant-potential control power source incorporating a microcomputer. CONSTITUTION:For example, in plural electric railways 2a-2c, the plural collation electrodes 4a-4c for detecting the voltage to ground of the buried pipe 1 are set along the buried pipe 1 approaching and crossing the railways 2 in the vicinity of the buried pipe 1. Plural galvanic electrodes 3a-3c for an external power source are simultaneously set around the periphery of each electrode group 4 in the state forming pairs with the group 4 in ratio of 1:1 or 1:n. The electrode groups 3 and 4 are connected to the automatic constant-potential control power source device 5. The detected potential by the electrode 4 is inputted to the microcomputer incorporated in the device 5, computed, and compared with the set potential. The value exhibiting a noble potential and the electrode 3 in its vicinity are selected, and a necessary corrosion protection current is applied to the position exhibiting the noble potential from the electrode 3.

5. 发明专利

JPS6468485A AUTOMATIC CONTROL DEVICE FOR ELECTROLYTIC CORROSION PREVENTIVE CURRENT RECTIFIER 失效
公开(公告)号：JPS6468485A
公开(公告)日：1989-03-14
申请号：JP22519187
申请日：1987-09-10
申请人： TOKYO GAS CO LTD , NAKAGAWA CORROSION PROTECT
发明人： KANEDA OSAMU , TOYODA SHIGERU , YAMAGUCHI KENICHI , FUKUOKA TAKASHI
IPC分类号： H02M7/00 , C23F13/00 , G05F1/10
摘要： PURPOSE:To enable control even in a place where potential fluctuates largely with the titled device for controlling the potential of an object to be protected by using a high speed response type device having specific constitution in place of PID control. CONSTITUTION:Protective current is supplied from an energizing electrode 2 to the object (3) to be protected and the potential of the pipe 3 is measured by a measuring means 5 with a potential reference electrode 4 as a reference. The basic controlled variable is instructed from a basic controlled variable setting means 6 to a current rectifier control means 7 in accordance with the result of the measurement, then said means instructs the quantity of energization to the current rectifier 1 and confirms the quantity. The change in the potential of the pipe 3 is detected by the means 5 and the automatic control operation is carried out by repeating the operation similar to the above-mentioned operation. The means 7 receives the pulse energization instruction from a pulse energization instruction deciding means 8 and controls the current rectifier 1 so as to make the pulse energization between the electrode 2 and the pipe 3. The means 8 takes the potential response value of the pipe 3 and the electrode 4 synchronized therewith into said means via the means 5 and calculates the relation between the energization value and potential change quantity in accordance with the potential response value. The means 6 takes in the result of the learning, sets the same and instructs the basic controlled variable in accordance with the result of said learning to the means 7.

6. 发明专利

JPS63191049A DETECTION OF ANTICORROSION COVER DAMAGE POSITION FOR BURIED METAL PIPES 失效
公开(公告)号：JPS63191049A
公开(公告)日：1988-08-08
申请号：JP2169087
申请日：1987-02-03
申请人： NIPPON STEEL CORP , TOKYO GAS CO LTD
发明人： KAWAKAMI MAKOTO , KURODA YOSHINORI , SAITO KIMIMASA , YAMAGUCHI KENICHI
IPC分类号： G01V3/00 , G01N27/20
摘要： PURPOSE:To detect a cover damage position accurately, by using a reference signal with the frequency the same as that of an AC signal for measurement when a ground surface potential difference is measured employing a wheel electrode. CONSTITUTION:A receiver 7 with a wheel electrode 8 is placed on the surface of ground where a metal pipe 2 provided with an anti-corrosion cover 1. An AC signal current runs is supplied by a measuring signal transmitter 6 between the metal pipe 2 and an opposed pole 5, and a potential difference is measured between two points on the ground surface with the wheel electrode 8 moving along the metal pipe 2 to be inputted into a detection signal input section of a lock-in amplifier 9. A signal with the frequency the same as that of an AC signal current is supplied from a reference signal oscillator 10 to a reference signal input section of the lock-in amplifier 9. After a noise signal with the frequency different from that of the reference signal is removed from a detection signal and changes in the phase are detected to learn the position of a cover damage part. This enables elimination of a wire for reference signal transmission thereby facilitating the detection of a damage position regardless of a longer distance between the transmitter 6 and the receiver 7.

7. 发明专利

JPS63275978A METHOD FOR DETECTING CONTACT BETWEEN DIGGING BLADE OF EXCAVATOR AND BURIED METAL PIPE 失效
公开(公告)号：JPS63275978A
公开(公告)日：1988-11-14
申请号：JP11140087
申请日：1987-05-07
申请人： TOKYO GAS CO LTD
发明人： YONEYAMA KIYOSHI , YAMAGUCHI KENICHI , MIYAMOTO YUKINOBU
IPC分类号： E02F9/24 , G01B7/00 , G01V3/08 , G01V3/11
摘要： PURPOSE:To prevent the damage of buried metal pipe with an excavator effectively, by detecting the change in grounding potential of a digging blade with a detecting means based on the contact of the digging blade and the buried metal pipe, on which electric anticorrosion is applied, in digging. CONSTITUTION:When a digging blade 2 and a buried metal pipe 4 are not brought into contact, the grounding potential of the digging blade 2 is usually, e.g., -500mV--750mV in converted value to a CuSO4 electrode. Anticorrosion current is usually made to flow through the buried metal pipe 4 from an anticorrosion power source 5. When the digging blade 2 is brought into contact with the buried metal pipe 4, the grounding potential of the digging blade 2 is changed into, e.g., -850mV or less because of the contact. When the grounding potential of the digging blade 2 is always monitored, whether the digging blade 2 is brought into contact with the buried metal pipe 4 is immediately detected without fail. Namely, the output of the judged result of a comparing and judging part is inputted into a warning device or an automatic stopping device. Thus the contact of the digging blade 2 and the buried metal pipe 4 is instantly detected, and the damage of the buried metal pipe can be prevented beforehand.

8. 发明专利

JPH06182872A PREVENTING METHOD FOR PARTIAL CORROSION OF STEEL TUBE 失效
公开(公告)号：JPH06182872A
公开(公告)日：1994-07-05
申请号：JP34248192
申请日：1992-12-22
申请人： NIPPON STEEL CORP , TOKYO GAS CO LTD
发明人： MIYAMOTO YUKINOBU , YAMAGUCHI KENICHI , CHIKADA KYOJI , SASAKI NOBUHIRO , SUZUKI SHOJI
IPC分类号： B29C63/06 , F16L58/02
摘要： PURPOSE:To provide a method for heating a hat shrinkable coating material to form an excellent corrosion preventing coating having no burning deterioration and no unadhering part to an outer surface of the tube at a joint or a damaged part of the coating of a steel tube. CONSTITUTION:A heat shrinkable coating material 4 is wound on an outer surface 1 of a tube and a factory coating part 3, and its periphery is coated with a heat generator 5 made of a heat shrinkable sheet in which an electric heating wire 6 is sealed. The wire of the generator is energized to the coating material thereby to adhere the coating material to the outer surface of the tube.

9. 发明专利

JPS6438689A DETECTOR OF UNDERGROUND METAL CONDUIT 失效
公开(公告)号：JPS6438689A
公开(公告)日：1989-02-08
申请号：JP19264687
申请日：1987-08-03
申请人： HITACHI LTD , TOKYO GAS CO LTD , NIPPON BOSHOKU KOGYO KK
发明人： WATABIKI MASAYUKI , SONODA SHINJI , YAMAGUCHI KENICHI , SAITO KIMIMASA , ARAI MINORU
IPC分类号： G01V3/11 , G01V3/02 , G01V3/06
摘要： PURPOSE:To securely detect possibility for damage from a conduit system side by connecting a resonating circuit in which detecting current is resonated to vary in high impedance between an underground metal conduit and a corrosion preventing device. CONSTITUTION:Earth points i, i+1,... are provided at prescribed intervals on a conduit 1. On the other hand a detector 2, a power source 3 and resonating circuits 4 are connected to a conduit system 1 at a point i, and the earth side is linked to a corrosion preventing device 7. In the case where an excavator 5 damage the conduit at a damage part 6, the voltage and the current of a signal varies because the impedance is considerably low at this point. This variation is grasped by the detector 2. Further, in regard to the deciding of the damage part 6 time difference of damage signals from each point at which the detector 2 receives is computed at a relay point or at the center. Since the resonating circuits 4 are inserted at each earth part i, i+1, ..., and high impedance is formed for the signals of the power source 3, the current signal is very little from the conduit system 1 to the earth and so the signals go on long distance.

10. 发明专利

JPS62294962A DAMAGE DETECTOR 失效
公开(公告)号：JPS62294962A
公开(公告)日：1987-12-22
申请号：JP13811086
申请日：1986-06-16
申请人： TOKYO GAS CO LTD , HITACHI LTD
发明人： YAMAGUCHI KENICHI , WATABIKI MASAYUKI , SONODA SHINJI
IPC分类号： G01N21/84 , G01N21/88 , G01N27/20 , G01N29/04
摘要： PURPOSE:To enable detection of damage to a buried pipe by an external force beforehand, by arranging a transmission path for sending a specified signal along the length of the tube on the circumference thereof. CONSTITUTION:A coated layer 2 is formed on the circumference of a buried pipe 1. A transmission path 3 such as insulated wire, feeder wire and optical fiber cable for transmitting an electrical signal or optical signal is arranged singly or in combination thereon to transmit a signal along the length of the pipe 1. An armoring 4 is provided outside the path. Signal is transmitted from one end of the transmission path 3 and received at the other and thereof. A damage to the buried pipe 1 is detected from the cutting of the signal.

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