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THE ROTARY SINGLE HEIGHT

TELL TALE

THE ROTARY SINGLE HEIGHT

TELL TALE

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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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