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JPS56142931A - Cutting edge for underground excavation - Google Patents

Cutting edge for underground excavation

Info

Publication number
JPS56142931A
JPS56142931A JP4568280A JP4568280A JPS56142931A JP S56142931 A JPS56142931 A JP S56142931A JP 4568280 A JP4568280 A JP 4568280A JP 4568280 A JP4568280 A JP 4568280A JP S56142931 A JPS56142931 A JP S56142931A
Authority
JP
Japan
Prior art keywords
magnetic field
cutting edge
detector
magnetic
horizontal
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.)
Pending
Application number
JP4568280A
Other languages
Japanese (ja)
Inventor
Masatake Maeda
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.)
Ohbayashi Gumi Ltd
Obayashi Gumi Ltd
Original Assignee
Ohbayashi Gumi Ltd
Obayashi Gumi Ltd
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 Ohbayashi Gumi Ltd, Obayashi Gumi Ltd filed Critical Ohbayashi Gumi Ltd
Priority to JP4568280A priority Critical patent/JPS56142931A/en
Publication of JPS56142931A publication Critical patent/JPS56142931A/en
Pending legal-status Critical Current

Links

Landscapes

  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Navigation (AREA)

Abstract

PURPOSE: To detect the displacement of cutting edge correctly and easily by a method wherein magnetic field is generated to offset the horizontal component of the magnetic field which influences on a magnetic field detector from the cutting edge at a magnet generating source.
CONSTITUTION: The detecting part 4a of the magnetic field detector 4 which detects the displacement in horizontal direction of the magnetic field induced by the horizontal magnetic component of the terrestrial magnetism is equipped to the main body of the cutting edge 3 for the ground excavation. The generating source 5 of magnetism is equipped together with the detector 4a to induce the magnetic field in the horizontal direction from the cutting edge 3 to the detecting part 4a of the magnetic field detector 4. The electric current for the magnetic cores 5a, 5b is supplied by the source of direct current 5 being variably controlled by the current regulators R1, R2 independently. Thus equipped, the optimum point where the magnetic field which affects from the cutting edge 3 to the detector 4a is offset most efficiently is determined by controlling the direction and the magnitude of the composite vector of magnetic field generated by the magnetic cores 5a, 5b.
COPYRIGHT: (C)1981,JPO&Japio
JP4568280A 1980-04-09 1980-04-09 Cutting edge for underground excavation Pending JPS56142931A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4568280A JPS56142931A (en) 1980-04-09 1980-04-09 Cutting edge for underground excavation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4568280A JPS56142931A (en) 1980-04-09 1980-04-09 Cutting edge for underground excavation

Publications (1)

Publication Number Publication Date
JPS56142931A true JPS56142931A (en) 1981-11-07

Family

ID=12726157

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4568280A Pending JPS56142931A (en) 1980-04-09 1980-04-09 Cutting edge for underground excavation

Country Status (1)

Country Link
JP (1) JPS56142931A (en)

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