THE ROTARY SINGLE HEIGHT TELL TALE THE ROTARY SINGLE HEIGHT TELL TALE R M T Rock Mechanics Technology
THE ROTARY SINGLE HEIGHT
TELL TALE
THE ROTARY SINGLE HEIGHT
TELL TALE
R M TRock Mechanics
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25mm ØDrill a vertical 25mm diameter hole in the roof
to 4m minimum above the roofline.
STEP 1
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Min
: 4m
Remove the telltale from its packaging.
Unwind the anchor wire,taking care not to
tangle the wire
STEP 2
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Connect together the telltale installation rods
ensuring the specialadapter is at the top
STEP 3
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Anchor spring adaptorto the top
Clip the telltale wire‘end anchor spring’ into the adapter at the top of
the installation rods
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STEP 4
Place the installation rodsand anchor spring into
the mouth of the roof hole,ensuring concentricity
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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
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STEP 6
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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.
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STEP 8
Turn the dial pointer fully anticlockwise until it reaches
the bottom of its travel
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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
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Once satisfied with theposition of the ferrule crimpthe ferrule 3 times to secure
STEP 11
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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
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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
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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
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L5
L4
2R 1RX/ 1R-2R / L5 X / 1R / L5
X / 1R / L4-L5
READING TELL TALESREADING TELL TALES
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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 Boss’s 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
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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
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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
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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
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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
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