THE ROTARY SINGLE HEIGHT TELL TALE - ROTARY SINGLE HEIGHT TELL TALE THE ROTARY SINGLE HEIGHT TELL TALE R M T Rock Mechanics Technology

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  • THE ROTARY SINGLE HEIGHT

    TELL TALE

    THE ROTARY SINGLE HEIGHT

    TELL TALE

    R M TRock Mechanics

    Technology

  • 25mm Drill a vertical 25mm diameter hole in the roof

    to 4m minimum above the roofline.

    STEP 1

    R M TRock Mechanics

    Technology

    Min

    : 4m

  • Remove the telltale from its packaging.

    Unwind the anchor wire,taking care not to

    tangle the wire

    STEP 2

    R M TRock Mechanics

    Technology

  • Connect together the telltale installation rods

    ensuring the specialadapter is at the top

    STEP 3

    R M TRock Mechanics

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    Anchor spring adaptorto the top

  • Clip the telltale wireend anchor spring into the adapter at the top of

    the installation rods

    R M TRock Mechanics

    Technology

    STEP 4

  • Place the installation rodsand anchor spring into

    the mouth of the roof hole,ensuring concentricity

    R M TRock Mechanics

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    STEP 5

  • Make sure the anchor wire ishanging freely, then push

    the rods to the back ofthe roof hole.

    Remove installation rods

    R M TRock Mechanics

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    STEP 6

  • R M TRock Mechanics

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    STEP 7

    Slide the telltale reference tube / dial plate assembly

    up the anchor wire and installthe reference tube into the hole.

  • R M TRock Mechanics

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    STEP 8

    Turn the dial pointer fully anticlockwise until it reaches

    the bottom of its travel

  • R M TRock Mechanics

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    STEP 9

    Using a pair of pliers,slide the free ferrule from

    the end of the hanging wireuntil it contacts the end of the

    telltale pointer.Carefully position the ferrule on

    the wire such that the telltale indicator is lifted approximately

    1mm of indication off the bottom of its travel, then crimp

    the ferrule lightly

  • STEP 10

    R M TRock Mechanics

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    Once satisfied with theposition of the ferrule crimpthe ferrule 3 times to secure

  • STEP 11

    R M TRock Mechanics

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    Remove surplus wire

  • Turn the dial backing plateuntil the zero aligns with

    the pointer

    STEP 12

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  • BR AR R2 R3 R4 R5L5 L4 L3 L2 L1

    BEL

    T R

    OA

    D

    TRA

    CTO

    R R

    OA

    D

    15

    14

    13

    12

    11

    10

    = ROTARY TELL TALE

    Tell Tales installed as section advances

    SYSTEMATIC TELL TALE MONITORINGFOR NORMAL ZERO SEAM CONDITIONS

  • BEL

    T R

    OA

    D

    TRA

    CTO

    R R

    OA

    D

    14

    13

    12

    11

    10

    15

    M R1 R2 R3 R4 R5L5 L4 L3 L2 L1

    = ROTARY TELL TALE

    = AREA OF CONCERN

    TELL TALE LOCATIONS FOR A SECTION WORKING THROUGH AN AREA OF CONCERN

  • TELL TALES INSTALLED AT INTERSECTIONSSHOULD BE AT THE CENTRE OF THE SPAN

    AND SHOULD BE INSTALLED BEFORE THEJUNCTION GEOMETRY IS FORMED

    R M TRock Mechanics

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    X

    X

    XX

    X

    X

    Road excavated just past junction.Tell tale installed at the junction centre following support .

    Three way geometry formed Four way geometry formed

    STEP 1: STEP 2: STEP 3:

    This sequence illustrates the ideal timing of tell tale installation in relation to geometry formation to maximise the effectiveness of the tell tale.

  • CROSS SECTION

    PLAN

    CROSS SECTION

    PLAN

    0.6m

    0.6m

    Tell Tale Tell Tale

    Tell Tale

    Tell Tale

    SLIP

    SLIP

    SLIP

    SLIP

    WEAK SIDE

    R M TRock Mechanics

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    WEAK SIDE

  • BOLTS SHOWN ARE IN ADDITION TO NORMAL SUPPORT AND MUST BE AT LEAST 0.5m LONGER THAN HEIGHT OF BROW

    NO

    RM

    AL

    PA

    TTE

    RN

    R

    ES

    UM

    ED

    ADDITIONAL BOLTS WITHIN0.3m OF BROW @

    1.0m SPACINGS (max)

    TELL TALE APPRROX 0.5mFROM BROW @

    ROADWAY CENTRE

    BROW

    LOW SIDE

    HIGH SIDE

    INCREASED BOLTDENSITY FOR 3 ROWS

    FROM BROW

    NORMAL PATTERN RESUMED

  • NORMAL PATTERN RESUMED

    3 ROWS ATHIGHER BOLT DENSITY0.3m

    max

    BROW

    TELL TALE

    NORMAL PATTERN

    SECTION

  • REFERENCE CODES FOR TELL TALESINSTALLED IN A SECTION

    SECTION / ROAD / LEVEL

    R M TRock Mechanics

    Technology

    L5

    L4

    2R 1RX/ 1R-2R / L5 X / 1R / L5

    X / 1R / L4-L5

  • READING TELL TALESREADING TELL TALES

    R M TRock Mechanics

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    It should be the the responsibility of the MINER each shift torecord the tell tales by colour for all active areas in the section.

    A book should be kept at the section WAITING PLACE in which eachshifts tell tale readings are recorded.

    Where a colour change takes place this should be reported on theShift Bosss statutory shift report, together with comment on any remedial actions taken. In addition the Shift Boss should record the millimetre reading of the relevant tell tales.

    EACH SHIFT

    READ BY COLOUR :-

    GREENYELLOW, OR

    RED

    IF A COLOURCHANGE

    TAKES PLACE

    READ BY NUMBER

  • READING TELL TALESREADING TELL TALES

    R M TRock Mechanics

    Technology

    Once per week, the MINER should, in addition to recording hisshiftly observations by colour, record the millimetre reading on each tell tale in his section (active areas).

    This information should be recorded on a weekly sheet, which should be passed to the nominated ROOF CONTROL AUDITOR for trend analysis.

    EACH WEEK

    READ BY MILLIMETRES :

    0 mm

  • ACTION LEVELSACTION LEVELS

    R M TRock Mechanics

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    GREEN 0 - 5 mm

    YELLOW 5 - 10 mm

    RED 10 mm +

    GREEN 0 - 5 mm

    YELLOW 5 - 10 mm

    RED 10 mm +

  • ACTIONSACTIONS

    R M TRock Mechanics

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    GREEN No action required, continue routine monitoring

    YELLOW Install additional reinforcement. Length and typeof support to be determined by investigationsco-ordinated by Shift Boss / Mine Overseer / RoofControl Officer.

    RED Restrict access. Consult Shift Boss / Mine Overseer /Roof Control Officer.

  • GOLDEN RULEGOLDEN RULE

    IF YOU SEE ANY TELL TALEIN YELLOW SECTOR

    INFORM YOUR SUPERVISOR

    IF YOU SEE ANY TELL TALEIN YELLOW SECTOR

    INFORM YOUR SUPERVISOR

    R M TRock Mechanics

    Technology

  • GOLDEN RULEGOLDEN RULE

    IF YOU SEE ANY TELL TALEIN RED SECTOR

    WITHDRAW FROM AREAAND INFORM YOUR

    SUPERVISOR

    IF YOU SEE ANY TELL TALEIN RED SECTOR

    WITHDRAW FROM AREAAND INFORM YOUR

    SUPERVISORR M TRock Mechanics

    Technology