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    Op-3-74. Checklist For Pull Out Test (Soil Nail) : Work Instructions For Engineers

    Uploaded by

    jinwook75
    This document provides a checklist for engineers to follow when conducting pull-out tests on soil nails. The checklist covers nail information, pre-testing requirements like grout strength testing, test setup details, loading and monitoring procedures, and reporting requirements. Engineers are instructed to verify items like equipment calibration and test load application before issuing approval for pull-out testing to be performed on site.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Op-3-74. Checklist For Pull Out Test (Soil Nail) : Work Instructions For Engineers

    Uploaded by

    jinwook75
    13 views5 pages
    This document provides a checklist for engineers to follow when conducting pull-out tests on soil nails. The checklist covers nail information, pre-testing requirements like grout strength testing, test setup details, loading and monitoring procedures, and reporting requirements. Engineers are instructed to verify items like equipment calibration and test load application before issuing approval for pull-out testing to be performed on site.

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    Original Title

    CH_032

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    This document provides a checklist for engineers to follow when conducting pull-out tests on soil nails. The checklist covers nail information, pre-testing requirements like grout strength testing, test setup details, loading and monitoring procedures, and reporting requirements. Engineers are instructed to verify items like equipment calibration and test load application before issuing approval for pull-out testing to be performed on site.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    13 views5 pages

    Op-3-74. Checklist For Pull Out Test (Soil Nail) : Work Instructions For Engineers

    Uploaded by

    jinwook75
    This document provides a checklist for engineers to follow when conducting pull-out tests on soil nails. The checklist covers nail information, pre-testing requirements like grout strength testing, test setup details, loading and monitoring procedures, and reporting requirements. Engineers are instructed to verify items like equipment calibration and test load application before issuing approval for pull-out testing to be performed on site.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 5

    Section: OP-3-74

    G&P GEOTECHNICS SDN BHD


    Revision: 0
    Date: 12-3-2007
    CHECKLIST FOR PULL OUT TEST (SOIL NAIL) Page 1 of 5

    WORK INSTRUCTIONS FOR ENGINEERS

    LST
    Compiled by : _____________________________________

    CCM
    Checked by : _____________________________________

    LSS
    Approved by :_____________________________________

    OP-3-74. CHECKLIST FOR PULL OUT TEST


    (SOIL NAIL)
    Section: OP-3-74
    G&P GEOTECHNICS SDN BHD
    Revision: 0
    Date: 12-3-2007
    CHECKLIST FOR PULL OUT TEST (SOIL NAIL) Page 2 of 5

    CHECKED BY
    No. CHECKLIST ITEMS G&P ENGINEER
    1.0 NAIL INFORMATION
    Type of pull-out test: Preliminary (Verification test)/Working (Proof test)*
    * delete wherever not applicable
    Nail ID/Location: _____________________
    1.1 Length: ____ m (minimum 3m of bonded length)
    Design Test Load: ______ kN
    Load Cycle: ______ cycles

    2.0 INFORMATION PRIOR TO TESTING AT SITE


    Is pull out test to be carried out at least 72 hours after grouting of the
    2.1
    soil nail or achieve minimum 20N/mm2?
    At least six (6) numbers of cube samples to be prepared for the 7 days
    2.2 and 28 days compression test.
    Is the cube result (i.e 7 days) submitted to G&P for review? Yes No

    Is the nail installation record(s) reviewed and approved by the Yes No


    2.3
    consultant?
    Are the typical contents of the pull-out test report and loading schedule Yes No
    2.4
    (sequence) made known to the contractor?
    Calibration certificates of the following measuring devices:
    a) Pressure Gauge (Hydraulic Jack) - Serial No:______________
    The capacity shall be at least 1.2 to 2.0 times maximum test load.
    b) Load Cell - Serial No: ________________
    2.5 c) Dial Gauges-Serial No: 1)____________ 2)_____________
    3) ____________ 4) _____________
    d) Data logger (if any) - Serial No: _________________
    Yes No
    Is the date of calibration of the above measuring devices not
    exceeding six (6) months?
    The description and layout/cross section of test setup shall be
    2.6
    submitted for Engineer’s approval prior to testing at site.
    Is the pressure gauge and load cell capable of loading up to the
    required test loads at site? Confirm with the contractor first before Yes No
    2.7
    carrying out at site (sometimes it cannot due to setting-up and slope
    condition issue)
    3.0 SLOPE CONDITION PRIOR TO TESTING
    3.1 Localised uneven slope profile shall be trimmed when necessary.
    To prevent excessive disturbance to the existing slope, large scale
    3.2
    slope trimming is prohibited.
    If test nail is at higher ground and requiring staging, sufficient bracing
    3.3 and strutting shall be fixed to ensure that the staging is rigid and safe
    prior to pull-out testing and during monitoring works.
    The bearing capacity of the subsoil at the slope is adequate for pull-out Yes No
    3.4 test? (Check if it will subside if load increases gradually when load to
    the required test load).
    Section: OP-3-74
    G&P GEOTECHNICS SDN BHD
    Revision: 0
    Date: 12-3-2007
    CHECKLIST FOR PULL OUT TEST (SOIL NAIL) Page 3 of 5

    4.0 TESTING SETUP


    Seating base for the pull-out test is
    a) steel plate b) shotcrete surface c) concrete pad *
    * delete wherever not applicable
    4.1
    Dimension of the seating base: L ( )XB( )XH( )

    Independent Reference Beam (IRB) [distance, rigid, IRB legs shall be


    4.2 firmly installed, not too close to the soil nail position (minimum distance
    1.0m away from the nail position and/or outside the seating base)].
    No compressible material between the hydraulic jack and the soil nail
    4.4
    head.
    The seating preparation for the hydraulic jack (pressure gauge) shall be
    directly contacted on the seating base. Independently support and
    centre the jack over the nail bar so that the bar does not carry the
    4.5 weight of the testing equipment.

    The contact face should be even and perpendicular to the soil nail
    position.
    Visually align the dial gauges to be parallel with the axis of test
    nail. Sometimes, alignment load (<5% of design test load) is
    4.6
    required to align the testing apparatus. Dial gauges should be set
    to ‘zero’ after the alignment load has been applied.
    Check whether the soil nail is in contact with the abovementioned
    4.7
    seating base. (please refer to Figures below)
    Are the adopted pressure gauge, load cell, dial gauges, datalogger (if
    4.8 any) similar with the submitted calibration certificates to the consultant?
    Check the serial no of the measuring devices prior to start monitoring.
    Check and record the seating of the dial gauges and the direction
    of the dial gauges’ readings during loading and unloading. This is
    4.9 to confirm the reading corresponding to tensile or compression
    nail movement. This is important when corrections are necessary
    during results interpretation.

    5.0 DURING LOAD SEQUENCE, MONITORING AND RECORDING

    5.1 Did testing follow loading sequence and its holding period?
    Take and record readings before and after load increment/decrement
    and record all necessary info. Actual readings of load cell and pressure
    5.2
    gauge shall be recorded, not the calculated values from the loading
    schedule. Refer to Soil Nail Field Record Sheet.
    Check the following critical movement:
    a) For preliminary pull-out test, 0.8 times steel characteristic strength:
    5.3 b) For working pull-out test, creep test (1.5 times working load):
    The load during the creep test shall be maintained within 2% of the
    intended load by use of the load cell.
    For creep test, is the nail movement more than 1mm within the holding
    periods of 1 to 10 minutes? If yes, extend to total of 60 minutes and
    monitor the movement and check whether more than 2mm in total.
    Measure nail movement at 1,2,3,5,6,10,20,30,50 and 60 minutes
    5.4 during creep test.
    Section: OP-3-74
    G&P GEOTECHNICS SDN BHD
    Revision: 0
    Date: 12-3-2007
    CHECKLIST FOR PULL OUT TEST (SOIL NAIL) Page 4 of 5

    6.0 REPORT PREPARATION


    The following information to be included in the report submission:
    a) Introduction
    b) Methodology
    c) Description of Apparatus
    d) Test Procedure (with setting up sketch)
    e) Table of the Load Increment / Cycle
    f) Summary of Test Results
    g) Graphs [Applied Load (kN) vs Deflection (mm) and Applied
    6.1 Load (kN) vs Time (min)]
    h) Pull out Test Field Record Form (with verification by Site
    Supervising Staff)
    i) Detail Results of Pull Out Test
    j) Datalogger Output (with verification by Site Supervising Staff)
    k) Copies of Calibration Certificates
    l) Actual photos at site drawing showing the setting-up and
    arrangement of the apparatus/instrument adopted for the pull-
    out test.
    7.0 MISCELLANEOUS
    Ensure the following are provided at site:
    - Stop watch and clock
    - Field recording form
    - Loading Sequence
    - Bubble level
    - Additional dial gauges
    - Digital camera

    Note: The abovementioned practice should be prohibited as it will produce false result.
    Section: OP-3-74
    G&P GEOTECHNICS SDN BHD
    Revision: 0
    Date: 12-3-2007
    CHECKLIST FOR PULL OUT TEST (SOIL NAIL) Page 5 of 5

    Annulus and seating


    plate shall be larger
    than grout diameter

    Note: Option A is adopted when the nail is fully grouted.

    Note: Option B is highly recommended.

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