• info@mineportal.in
  • +91 8804777500
  • Download Mine Portal Application
Test Series Discussion Forum User Notes Mutual Transfer PRP Calculator Register Login
    Logo
    • Home
    • FIRST/SECOND CLASS
      • COAL
        • TEST SERIES
        • SYLLABUS
        • STUDY MATERIAL
        • EXAM PAPER ANALYSIS
      • METAL
        • TEST SERIES
        • SYLLABUS
        • STUDY MATERIAL
        • EXAM PAPER ANALYSIS
      • COMMON STUDY MATERIAL
        • SHORT NOTES
        • MINE MANAGEMENT NOTES
        • DAILY MINING QUE
        • THINGS TO KNOW
        • SUCCESS STORY/REPORT CARD
      • COAL FMC/SMC EXAM PAPERS
        • 2015
        • 2021
        • 2021 (DEC)
      • METAL FMC/SMC EXAM PAPERS
        • 2021
        • 2021 (DEC)
      • RESULT/NOTIFICATION
        • 2020
        • 2021
        • 2022
    • OM/MS/SURVEYOR
      • TEST SERIES
        • OVERMAN EXAM
        • SIRDAR EXAM
      • SYLLABUS & EXAM PATTERN
        • OVERMAN EXAM
        • MINING SIRDAR EXAM
        • SURVEYOR
      • OM PREVIOUS YEAR PAPERS
        • 2017
        • 2018
        • 2019
        • 2021
      • MS PREVIOUS YEAR PAPERS
        • 2017
        • 2018
        • 2020
        • 2021
        • 2022
      • NEWS/RESULT
        • 2020
        • 2022
      • STUDY MATERIAL
    • MATE/FOREMAN
      • TEST SERIES
      • SYLLABUS
        • MINING MATE
        • MINE FOREMAN
      • FOREMAN EXAM PAPERS
        • 2021
      • MINE MATE EXAM PAPERS
        • 2021
      • BLASTERS EXAM PAPERS
        • 2021
      • NEWS/RESULT/NOTIFICATIONS
        • 2022
    • GATE MINING
      • TEST SERIES
      • EXAM SYLLABUS
        • 2017
        • 2018
        • 2019
        • 2020
        • 2021
        • 2022
        • 2023
      • EXAM PAPERS/ANALYSIS
        • 2007-2019
        • 2020
        • 2021
        • 2022
      • GATE REPORT/CUT OFF
        • 2018
        • 2019
        • 2020
        • 2021
        • 2022
      • SUCCESS STORY
        • 2018
        • 2022
      • GENERAL QUERY
        • HOW TO PREPARE
        • BOOKS TO BE FOLLOWED
        • EXAM PATTERN/UPDATES
        • PSUs RECRUITMENT
        • COLLEGE M.TECH CUT OFF
      • GATE SPECIFIC NOTES
    • COAL INDIA MT MINING
      • TEST SERIES
      • PREVIOUS YEARS PAPERS
        • 2012
        • PROBATION CLOSER EXAM
        • 2017
        • 2020
      • SYLLABUS
        • 2017
        • 2020
      • STUDY MATERIAL
      • SUCCESS STORY/INTERVIEW QUE
        • ON-CAMPUS PLACEMENT
        • 2012
        • 2017
        • 2020
      • NEWS/FAQ/ADVICE/RTI/CUT-OFF
        • GENERAL
        • 2017
        • 2020
        • 2021
        • 2022
      • RESULT
        • YEAR_2020
        • YEAR_2022
    • GAS TESTING
      • STUDY NOTES
        • SHORT NOTES
        • EXAM QUESTIONS
      • SUCCESS STORY
        • 2017
        • 2018
      • SYLLABUS/NEWS/FAQ
      • GAS TESTING EXAM LIST
        • 2020
    • MINING NOTES
      • LEGISLATION
        • CMR 2017
        • MMR 1961
        • OHSWC CODE
        • MINE RULES
        • MINE RESCUE RULES
        • MINE VTC RULES
        • OTHER RULES/REGULATIONS
        • CEA 2010
      • MINING VARIOUS TOPICS PPTs
        • COMPUTER APPLICATIONS
        • MINE VENTILATION & ENV
        • MINE MACHINERY
        • MINING MEHODS
        • MINE SURVEYING
        • EXPLOSIVE & BLASTING
        • MISCELLANEOUS
        • MINE MANAGEMENT
      • IIT(BHU) STUDENTS' NOTES
        • MINE MACHINERY
        • ELECTRICAL ENGINEERING
        • MINE ENVIRONMENT
        • ROCK MECHANICS
        • MINE SURVEYING
        • MINING METHODS
        • MINE ECONOMICS & PLANNING
        • MINE GEOLOGY
      • ROCK MECHANICS
        • ROCK PROPERTIES
        • ROCK MECHANICS
      • EXPLOSIVE & BLASTING
        • EXPLOSIVES
        • BLASTING
      • MINING METHODS & GEOLOGY
        • COAL MINING
        • METAL MINING
      • MINE VENTILATION & ENVIRONMENT
        • MINE FIRE
        • MINE ENVIRONMENT
      • MINE SURVEYING & MACHINERY
        • MINE SURVEYING
        • MINE MACHINERY
    • DGMS MATERIAL
      • CIRCULAR/BYE LAWS
        • 1935-2018
        • 2019
        • 2020
        • 2021
      • APPLICATION FORMS
        • COAL
        • METAL
      • DGMS FORMATS
        • MEDICAL CERTIFICATE
        • LAMP HANDLING
        • CHARACTER CERTIFICATE
        • EXPERIENCE CERTIFICATE
        • AFFIDAVIT
      • DGMS STANDARD NOTE
        • 2016
        • 2017
        • 2018
        • 2019
        • 2020
      • NEWS/FAQs
        • FORM FILLING GUIDELINES
        • 2020
    • MINING INFO/PAPERS
      • COAL INDIA NEWS
        • 2020
        • 2021
      • APPRENTICE
        • 2020
      • THINGS TO KNOW
        • FIRST AID
        • DGMS ADDRESS
        • DGMS EXAM ELIGIBILITY
      • NEWS/UPDATE
        • 2020
        • 2021
      • INTERVIEWS
        • OMCL EXAM
        • NMDC
      • ECET MINING
        • 2012
        • 2013
        • 2014
        • 2015
        • 2017
      • COLLEGE SEMESTER EXAM
        • IIT(BHU)VARANASI
        • IIT(ISM) DHANBAD
        • IIT KHARAGPUR
      • MISCELLANEOUS
        • SCCL
        • MECON
        • MINING INSPECTOR
        • DIPLOMA EXAM
        • AMIE
        • OTHER MINING EXAMS
    • More categories
      • PSU/COMPANIES
        • NMDC
        • BPSC MDO
        • TATA STEEL
        • UPPSC MINING INSPECTOR
        • ODISHA Jr MINING OFFICER
        • JHARKHAND MINING INSPECTOR

    Additional Links

    • Home
    • About us
    • Discussion Forum
    • User Notes
    • Mineportal Notes
    • Video Lectures
    • Mining Dictionary
    • Mining Jobs
    • Take Free Test
    • Offers
    • Terms of Use
    • FAQ

    Connect With Us

    Download The App

    • Download Mine Portal Application

    Details

    • Home
    • FIRST/SECOND CLASS
    • COMMON STUDY MATERIAL
    • SHORT NOTES
    • Standard components and properties of Steel Roof bolts to be used in mines

    Standard components and properties of Steel Roof bolts to be used in mines

    • 26-05-2022
    • 603
    • 0

    Standard components and properties of Steel Roof bolts to be used in mines

    1.0 Physical properties : (a) shape and size : The roof bolt shall be of MS steel or TMT Rebar having circular cross section with ribs on circumferential region. The manufacture of the roof bolt shall specify the design, calculations, yield strength and ultimate tensile strength along with elongation at yield and the factor of safety of the roof bolt manufactured by them.

    (b) Length Length of roof bolt shall not be more than the designed length of + 05 mm.

    (c) Diameter Diameter of roof bolt shall not be more than the designed diameter ± 04% by mass.

    (d) Straightness : The roof bolt shall be straight without any joint, welding, deviation or deflection. However if the deflection or deviation cannot avoided due to practical reasons, it shall not be more than + 0.1% per metre length of the bolt.

    (e) Rib The rib of the roof bolt shall be as per the design of the rib with the objective to maximise the surface area without reducing the core diameter of the roof bolt and having maximum grip with the grout. 2.0 Physico-mechanical properties : Steel for the roof bolt : The roof bolt shall be of thermo-mechanical treated (TMT) rebar manufactured from MS Grade Fe-500, Fe-600 or above. Minimum load bearing capacity (anchorage load) of the roof bolt shall be 160 KN. 3.0 Chemical Composition : chemical constituents of the steel which influence the required properties of steel are carbon, sulphur, Phosphorus, manganese and other alloying / micro alloying elements.

    Thread on the Roof Bolt : (a) The minimum length of the thread shall be 150 ± 05 mm. As a routine test, one thread in every 50 produced shall be checked using a go / no- go gauge.

    (b) Non-threaded end The non threaded end of the rock bolt shall be formed by cropping or sawing and shall be free from burrs and edge which protrude beyond the profile of the rock bolt. As a routine one rock bolt in every 200 produced shall be checked for straightness.

    (c) The nuts shall be hexagon shape of thickness not less than 30 mm.

    (d) Pull test : Thread and the nut on the roof bolt shall be subjected to pull test which should not slip at the yield strength / load of the room bolt. Bearing plate

    (a) The bearing plate of the roof bolt shall be Dome Washer Plate of dimension 150 x 150 x 8 mm with compatible central hole of required size and angled side to accommodate the conical seat and nut.

    (b) The minimum load at which the Domed Washer Plate will become flat should be at least 14 tonnes. Conical seat

    (a) Conical seat shall be of forged steel of required dimension.

    (b) The conical seat shall not be deform at 1.20 times the yield stress of the roof bolt. Tensile test of roof bolt assembly

    (a) The roof bolt assembly shall be subjected to tensile test and should not fail up to 16 tonnes load. Subject to the condition that system stiffness of the roof bolt assembly shall be within 20 KN/mm. System stiffness between 50 to 150 KN.

    Other properties and parameters (a) Weatherability : The roof bolts and its components are parts shall be subjected to a Accelerated Weathering Test in mine water condition for 20 days. No deterioration should occur on the assembly. (b) Accelerated Weathering Test : AWT shall also be conducted in acidic water condition for 20 days during which no deterioration should occur on the assembly. [Note the AWT under mine water condition generally is at ph > 4 and that under acidic water condition is considered at pH - 2 (05% HCL aqueous solution) during testing. The test limit is that the loss of weight shall not be more than 05%] (c) Corrosion resistance test : The roof bolt assembly shall also be subjected to Fixed Exposure and Corrosion Resistivity Test as per IS - 5555 : 1970 to test the resistance to corrosion of the steel of the roof bolt and its parts. The roof bolt should pass the required test. 6.0 Sampling and testing : In order to check the composition and required parameters during manufacture, it shall be required that the random sampling be done at the rate of 02 roof bolts per 1,000 pieces of roof bolts and its accessories manufactured in a batch which shall be subjected to the required set of tests. In case the roof bolts or any of its accessories fail to pass the required test at the users end, that batch or lot of the manufacture shall not be used in the mine and intimation thereof shall be sent to the manufacture. (Cir Approval 03/2010) 

    comments

    No comments added yet!

    Category

    • SHORT NOTES
    • MINE MANAGEMENT NOTES
    • DAILY MINING QUE
    • THINGS TO KNOW
    • SUCCESS STORY/REPORT CARD

    Related Blogs

    RECOMMENDED NOISE STANDARD

    RECOMMENDED NOISE STANDARD

    SUBJECTIVE QUESTIONS ON LEGISLATIONS

    SUBJECTIVE QUESTIONS ON LEGISLATIONS

    STANDARD OF VOCATIONAL TRAINING CENTER

    STANDARD OF VOCATIONAL TRAINING CENTER

    Duration Of Training For Different Categories

    Duration Of Training For Different Categories

    QUICK REVISION NOTES ON DGMS CIRCULARS-2019

    QUICK REVISION NOTES ON DGMS CIRCULARS-2019

    Logo

    Mine Portal is the favourite choice of thousands of mining professional aspirants for online DGMS Managership competency exam preparation. Our popular products include Online Test Series ...
    Read More

    CATEGORIES

    • FIRST/SECOND CLASS
    • MINING NOTES
    • MATE/FOREMAN
    • GATE MINING
    • COAL INDIA MT MINING
    • DGMS MATERIAL

    Recent

    • secl-mining-sirdar-syllabus
      SECL MINING SIRDAR SYLLABUS
    • ncl-mining-sirdar-exam-2022-paper-with-ans-key
      NCL MINING SIRDAR EXAM 2022 PAPER WITH ANS KEY
    • mcl-2022-overman-exam-syllabus
      MCL 2022 OVERMAN EXAM SYLLABUS

    © Copyright 2023. All Rights Reserved by Mine Portal, Design & developed by Mehta Websolution

    Open with

    Avatar

    Mineportal App

    Avatar

    Continue with browser

    Login with social

    login to your registered account!

    • login with Password
    • login with otp
    Lost your password?

    Not a member yet? Register now

    Email not verified? Verify Email

    Register with social

    Register a new account

    Are you a member? Login now

    Mobile phone verification

    Change Number

    Don't receive the code?

    Forgot Password

    Loading...

    Are you a member? Login now

    Social Login

    We haven't get your email address or mobile number from your social account.

    Mobile phone verification

    Change Number

    Don't receive the code?

    Resend Verification Link

    Loading...

    Are you a member? Login now

    Recover Password

    Don't receive the code?

    Reset Password

    Mobile phone verification

    Don't receive the code?

    Join Us On WhatsApp

    Note: Join for exam which you are preparing. To maintain uniqueness and diversification of group a person can only join one group. Any member found joining multiple groups will be removed.

    JOIN CHAT

    Join Us On Telegram

    Note: Join for exam which you are preparing. To maintain uniqueness and diversification of group a person can only join one group. Any member found joining multiple groups will be removed.

    JOIN CHAT

    Add Comment