FR1080395A - Device and method for measuring the tension of mine roof lag bolts and the like - Google Patents

Device and method for measuring the tension of mine roof lag bolts and the like

Info

Publication number
FR1080395A
FR1080395A FR1080395DA FR1080395A FR 1080395 A FR1080395 A FR 1080395A FR 1080395D A FR1080395D A FR 1080395DA FR 1080395 A FR1080395 A FR 1080395A
Authority
FR
France
Prior art keywords
tension
measuring
mine roof
lag bolts
lag
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.)
Expired
Application number
Other languages
French (fr)
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.)
Wingfoot Corp
Original Assignee
Wingfoot Corp
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 Wingfoot Corp filed Critical Wingfoot Corp
Application granted granted Critical
Publication of FR1080395A publication Critical patent/FR1080395A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/02—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection having means for indicating tension
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
FR1080395D 1953-03-19 1953-07-06 Device and method for measuring the tension of mine roof lag bolts and the like Expired FR1080395A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1080395XA 1953-03-19 1953-03-19

Publications (1)

Publication Number Publication Date
FR1080395A true FR1080395A (en) 1954-12-08

Family

ID=22319916

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1080395D Expired FR1080395A (en) 1953-03-19 1953-07-06 Device and method for measuring the tension of mine roof lag bolts and the like

Country Status (1)

Country Link
FR (1) FR1080395A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2422140A1 (en) * 1977-09-22 1979-11-02 Charbonnages De France Visual indicator for rock movement in mines - uses balls retained by blades and falling in vertical elements to define expansion
CN108507516A (en) * 2018-04-17 2018-09-07 中煤平朔集团有限公司 A kind of digital display type back sinking detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2422140A1 (en) * 1977-09-22 1979-11-02 Charbonnages De France Visual indicator for rock movement in mines - uses balls retained by blades and falling in vertical elements to define expansion
CN108507516A (en) * 2018-04-17 2018-09-07 中煤平朔集团有限公司 A kind of digital display type back sinking detector

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