JPS5723879A - Searcher for underground object - Google Patents

Searcher for underground object

Info

Publication number
JPS5723879A
JPS5723879A JP9877680A JP9877680A JPS5723879A JP S5723879 A JPS5723879 A JP S5723879A JP 9877680 A JP9877680 A JP 9877680A JP 9877680 A JP9877680 A JP 9877680A JP S5723879 A JPS5723879 A JP S5723879A
Authority
JP
Japan
Prior art keywords
earthing
resistor
underground
drilling
relay
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP9877680A
Other languages
Japanese (ja)
Other versions
JPS6022310B2 (en
Inventor
Shigeyuki Fuchigami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yashima Kogyo KK
Original Assignee
Yashima Kogyo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yashima Kogyo KK filed Critical Yashima Kogyo KK
Priority to JP55098776A priority Critical patent/JPS6022310B2/en
Publication of JPS5723879A publication Critical patent/JPS5723879A/en
Publication of JPS6022310B2 publication Critical patent/JPS6022310B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current

Abstract

PURPOSE:To prevent the contact failure on underground objects at drilling for road, by detecting the access to an underground object through the change in earthing resistor, through the formation of the earthing resistor with the earthing part of a drilling device and ground. CONSTITUTION:An earthing resistor is formed with a sensor input terminal 1 connected to a drilling pipe of a boring device and a sensor input terminal 2 connected to an earth rod. If the tip of the drilling pipe contacts near the underground object, the resistance value of the said earthing resistor is rapidly lowered, and the balancing of a bridge circuit consisting of variable resistors 4, 7 and a fixed resistor is unbalanced, the output is amplified at an amplifying circuit 13 to activate a relay 23. Then, a relay a contact 23a is closed, an alarm buzzer 32 is energized, an alarm indicating light 33 illuminates and the dangerous state is informed. Thus, even if various underground objects are burried with complexity, the boring job can be achieved surely without injuring the underground objects.
JP55098776A 1980-07-21 1980-07-21 Underground object detection device Expired JPS6022310B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55098776A JPS6022310B2 (en) 1980-07-21 1980-07-21 Underground object detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55098776A JPS6022310B2 (en) 1980-07-21 1980-07-21 Underground object detection device

Publications (2)

Publication Number Publication Date
JPS5723879A true JPS5723879A (en) 1982-02-08
JPS6022310B2 JPS6022310B2 (en) 1985-06-01

Family

ID=14228769

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55098776A Expired JPS6022310B2 (en) 1980-07-21 1980-07-21 Underground object detection device

Country Status (1)

Country Link
JP (1) JPS6022310B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6089789A (en) * 1983-10-22 1985-05-20 Akiyoshi Kogyo Kk Damage preventing device for buried body of building
JPS60138394A (en) * 1983-12-24 1985-07-23 Osaka Gas Co Ltd Heat storage type heat exchanger
JPS61165366U (en) * 1985-03-29 1986-10-14
JPS61271488A (en) * 1985-05-28 1986-12-01 Japan Steel & Tube Constr Co Ltd Buried object detector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6089789A (en) * 1983-10-22 1985-05-20 Akiyoshi Kogyo Kk Damage preventing device for buried body of building
JPS60138394A (en) * 1983-12-24 1985-07-23 Osaka Gas Co Ltd Heat storage type heat exchanger
JPH057638B2 (en) * 1983-12-24 1993-01-29 Osaka Gas Co Ltd
JPS61165366U (en) * 1985-03-29 1986-10-14
JPS61271488A (en) * 1985-05-28 1986-12-01 Japan Steel & Tube Constr Co Ltd Buried object detector

Also Published As

Publication number Publication date
JPS6022310B2 (en) 1985-06-01

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