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Published byBraxton Bunyan Modified over 10 years ago
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TRUSSES
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ROD TRUSSES
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U - BOLT TRUSS
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WHAT IS WRONG WITH THIS PICTURE ?
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TRUSS PROBLEMS
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TRUSS MISAPPLICATION
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DYWIDAG TENSIONABLE SLING
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ONE PIECE SLING
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ONE PIECE INSTALLATION
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ONE PIECE CABLE SLINGS
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TWO PIECE CABLE TRUSS OR SLING
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6 x 16 LOOP PLATE
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BLOCK & BARREL-WEDGES
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JACK OR WRENCH
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TIGHTENING UP TRUSS
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CLOSEUP OF BARREL & WEDGE
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FAILURE BROKEN WIRE
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WEAK ROOF SLING
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PRESSURE vs APPLIED LOAD
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TRUSSES USED ON TAILGATES
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CABLE BOLTS
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WORST CASE
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EXCEL CABLE BOLT PASSIVE SYSTEM
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NON-TENSIONED CABLE BOLT
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CABLE CROSS-SECTION DIAMETER –0.6 TO 0.9 INCH STRENGTH – GRADE 270
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BIRDCAGE FOR MIXING
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HOUSING UNIT
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WEDGE HOUSING CLOSE UP OF TEETH IN WEDGE ANCHORING INTO WIRE ROPE
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SPECIAL THREADS OR TEETH
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DYWIDAG CABLE BOLT ACTIVE SYSTEM
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TENSIONING CABLE BOLT
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TENSIONED CABLE BOLT
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POST TENSION TENIONABLE CABLE BOLT
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16 In the area 150 immediate outby roof fall area, center cable bolt is 22 long. In the other area, 16 long. 0.7 JM Post Tension cable bolt In the area 150 immediate outby roof fall area, maximum row spacing is 4. In the other area, maximum row spacing is 6 T-5 channel
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EPOXY COATING Central Strand Grit Surface Outer Strand Epoxy Coating
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STRENGTH OF CABLE BOLTS
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GRAPH OF (0.6 INCH ) EXCEL CABLE BOLT FAILURE
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CABLE BOLT PROPERTIES STEEL GRADE 270 LOW VISCOSITY RESIN ( EASIER TO INSERT CABLE ) STIFFNESS OF CABLE IS CONTROLLED BY LENGTH OF RESIN ( SHORTER THE FREE LENGTH, THE STIFFER THE CABLE ) RESIN FREE LENGTH
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COMMON CABLE PLANS SUPPLEMENTAL SUPPORT HOLES USUALLY 1 - 1 3/8 DIA 12 - 16 FT LENGTH 4 - 5 FT RESIN LENGTH –( ONE MINE, 2 FT RESIN ) 4 CABLES PER ROW 4 - 6 FT ROW SPACING SURFACE CONTROL, MATTS
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CABLE BOLTS USED AS PRIMARY SUPPORT
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LONGWALL GATE ENTRIES MINERS WITH INTERGAL BOLTERS ENTRY WIDTH 16.5 - 17 FT JENNMAR CB CABLE BOLTS SHELL 4 FOOT FROM END 4 FOOT RESIN TWO CABLE BOLTS, MATT & CENTER BOLT
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TYPES OF SUPPLEMENTAL SUPPORTS USED WITH CABLES, USED AS PRIMARY SUPPORT TRUSSES WITH CRIBS OR PROPSETTERS AT INTERSECTION OR TWO CRIBS, PROPSETTERS OR LINK-N-LOCKS ON 6 FT EDGE TO EDGE
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CABLE PLAN FOR HIGH HORIZONTAL STRESS 0.7 0.9
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THE END
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