Post on 31-Mar-2015
VARIOUS WAYS OF TIMING
• NORMAL TIMING - BLOCK.• NORMAL TIMING - STAGGERED.• DAISY CHAIN - STAGGERED.• REVERSE TIMING - BLOCK.• REVERSE TIMING - STAGGERED.
NORMAL TIMING
BLOCK PATTERN
NORMAL TIMING - BLOCK PATTERN
FREE
FACE
DIRECTION OF BLAST
NORMAL TIMING - BLOCK PATTERN
DIRECTION OF BLAST
FREE
FACE
NORMAL TIMING - BLOCK PATTERN
DIRECTION OF BLAST
FREE
FACE
ADVANTAGES
• CONSISTENT BURNING FRONT• SEQUENTIAL FIRING.• GREATER THROW OF THE ROCK.• IMPROVED ADVANCE PER BLAST.• FINER FRAGMENTATION.
DISADVANTAGES
• DAMAGE TO SUPPORT CAN BE MORE SEVERE WITH INACCURATE DRILLING.
NORMAL TIMING
STAGGERED PATTERN
FREE
FACE
DIRECTION OF BLAST
NORMAL TIMING - STAGGERED PATTERN
FREE
FACE
DIRECTION OF BLAST
NORMAL TIMING - STAGGERED PATTERN
FREE
FACE
DIRECTION OF BLAST
NORMAL TIMING - STAGGERED PATTERN
DISADVANTAGES
• BLASTING TOWARDS HANGWALL.• CREATING MORE DAMAGE TO THE
HANGWALL.• INCREASING PROBABILITY OF FOG’S.
DAISY CHAIN TIMING
STAGGERED PATTERN
FREE
FACE
DIRECTION OF BLAST
TIMING DONE IN DAISYCHAIN
1 3
2 4
5
6
7
8
9
FREE
FACE
DIRECTION OF BLAST
TIMING DONE IN DAISYCHAIN
1 3
2 4
5
6
7
8
9
FREE
FACE
DIRECTION OF BLAST
TIMING DONE IN DAISYCHAIN
FREE
FACE
DIRECTION OF BLAST
TIMING DONE IN DAISYCHAINBROKEN SHOCKTUBE
DISADVANTAGES
• RISK OF MISFIRES/CUT-OFF’S.
REVERSE TIMING
BLOCK PATTERN
1
5432
542 3
6
FREE
FACE
DIRECTION OF BLAST
REVERSE TIMING - BLOCK PATTERN
HEAVE OF ROCK DIRECTION
REVERSE TIMING - BLOCK PATTERN
FREE
FACE
DIRECTION OF BLAST
1 2
2 3
3 4 5
54 6
REVERSE TIMING - BLOCK PATTERN
FREE
FACE
DIRECTION OF BLAST
REVERSE TIMING - BLOCK PATTERN
FREE
FACE
DIRECTION OF BLAST
REVERSE TIMING - BLOCK PATTERNBROKEN SHOCKTUBE
FREE
FACE
DIRECTION OF BLAST
REVERSE TIMING - BLOCK PATTERN
CONNECTION
DIRECTION OF BLAST
1617
17
18
19
18
ADVANTAGES
• THROW OF ROCK TOWARDS FOOTWALL.
• REDUCING DAMAGE TO HANGWALL.
Backfill
GullyS
tick
Sid
eINCORRECT DRILLING
METHODWITH HANDIDETS
DISADVANTAGES
• THROW OF ROCK TOWARDS SUPPORT.
• SEVERELY DAMAGES SUPPORT.• CLEANING OPERATIONS DIFFICULT.• CONTAMINATES BACK AREAS.
CORRECT DRILLING METHODWITH HANDIDETS
Sti
ck S
ide
Backfill
ADVANTAGES
• THROW OF ROCK TOWARDS GULLY.• MINIMUM DAMAGE TO SUPPORT.• LESS CONTAMINATION TO BACK
AREAS.• IMPROVED CLEANING OPERATIONS.
REVERSE TIMING
STAGGERED PATTERN
REVERSE TIMING - STAGGERED PATTERN
FREE
FACE
DIRECTION OF BLAST
1
1 432
3 42
5
REVERSE TIMING - STAGGERED PATTERN
FREE
FACE
DIRECTION OF BLAST
REVERSE TIMING - STAGGERED PATTERN
FREE
FACE
DIRECTION OF BLAST
ADVANTAGES
• THROW OF ROCK TOWARDS FOOTWALL.
• REDUCING DAMAGE TO HANGWALL.
DISADVANTAGES
• DRILLING DISCIPLINE MUST BE MAINTAINED TO ENSURE PROPER BLASTING ASSOCIATED WITH THIS TIMING.
How to time the heading with HANDIDETS®
COLOURS INDICATE HOWTO CONNECT INDIVIDUAL
HANDIDETS
HANDIDET TRUNKLINEFROM GULLY
How to time the heading with HANDIDETS®
COLOURS INDICATE HOWTO CONNECT INDIVIDUAL
HANDIDETS
HANDIDET TRUNKLINEFROM GULLY
THIS IS THE MASTERSTARTER
CONNECTED TO THE FIRSTHANDIDET
CONNECTION OF FOOTWALL LIFTING IN GULLYWITH HANDIDETS®
THIS IS A 6mHANDIDET TRUNKLINE (EXTENDER)TO THE HEADINGOR TOE OF PANEL
1
4
2
3
5
REVERSE TIMING - BLOCK PATTERN WITH PRE-CONDITIONING in Slow Motion
FREE
FACE
DIRECTION OF BLAST
Assume to be three meters Assume to be three meters
Blue Line - Extenders with HandiMastersYellow Line - HandiMastersOrange Blocks - HandiMaster Blocks 200m/s delay
REVERSE TIMING - BLOCK PATTERN WITH PRE-CONDITIONING in Fast Mode
FREE
FACE
DIRECTION OF BLAST
Assume to be three meters Assume to be three meters
Blue Line - Extenders with HandiMastersYellow Line - HandiMastersOrange Blocks - HandiMaster Blocks 200m/s delay
FREE
FACEBlue Line - ExtendersYellow Line - HandiMastersOrange Blocks - HandiMaster Blocks 200m/s delayRed Holes - Production HolesBlue Holes - Pre Conditioning Holes
REVERSE TIMING - BLOCK PATTERN WITH PRE-CONDITIONING in 3D
FREE
FACEBlue Line - ExtendersYellow Line - HandiMastersOrange Blocks - HandiMaster Blocks 200m/s delayRed Holes - Production HolesBlue Holes - Pre Conditioning Holes
REVERSE TIMING - BLOCK PATTERN WITH PRE-CONDITIONING in 3D Fast Mode
FREE
FACEBlue Line - ExtendersYellow Line - HandiMastersOrange Blocks - HandiMaster Blocks 200m/s delayRed Holes - Production HolesBlue Holes - Pre Conditioning Holes
REVERSE TIMING - BLOCK PATTERN WITH PRE-CONDITIONING in 3D Slow Mode
DO’S AND DON'TS• DO NOT CONNECT HANDIMASTER
BLOCKS CLOSER THAN 10CM TO EACH OTHER.
• CLIP THE HANDIMASTER BLOCK 90° TO THE TUBING TO ENSURE PROPER CONTACT.
• DAISY CHAIN TIMING NOT RECOMMENDED.
DO’S AND DON'TS• DO NOT LET THE BURNING PART OF
A FUSE TOUCH THE TUBING AS IT WILL MELT IT AND WILL CAUSE MISFIRES/CUT-OFF’S.
• DO NOT INSERT MORE THAN THE MAXIMUM RECOMMENDED NUMBER OF TUBES IN A HANDIMASTER™ BLOCK.
DO’S AND DON'TS• ALWAYS USE SUFFICIENT LENGTHS
OF SHOCK TUBE FOR THE SPECIFIC APPLICATION.
• ALWAYS INITIATE SHOCK TUBE BY USING A DETONATOR (NONEL‡ FUSE MASTERSTARTER®) OR DETONATING CORD.
DO’S AND DON'TS• DO NOT REVERSE PRIME WITH
SHOCK TUBES.• DO NOT USE THE DETONATOR TO
MAKE A HOLE INTO A CARTRIDGE EXPLOSIVE FOR PRIMING PURPOSES.
• DO NOT TRY AN PULL OUT A MISFIRED UNIT OUT OF CHARGED HOLE.