TRUSSES
ROD TRUSSES
U - BOLT TRUSS
WHAT IS WRONG WITH THIS PICTURE ?
TRUSS PROBLEMS
TRUSS MISAPPLICATION
DYWIDAG TENSIONABLE SLING
ONE PIECE SLING
ONE PIECE INSTALLATION
ONE PIECE CABLE SLINGS
TWO PIECE CABLE TRUSS OR SLING
6 x 16 LOOP PLATE
BLOCK & BARREL-WEDGES
JACK OR WRENCH
TIGHTENING UP TRUSS
CLOSEUP OF BARREL & WEDGE
FAILURE BROKEN WIRE
WEAK ROOF SLING
PRESSURE vs APPLIED LOAD
TRUSSES USED ON TAILGATES
CABLE BOLTS
WORST CASE
EXCEL CABLE BOLT PASSIVE SYSTEM
NON-TENSIONED CABLE BOLT
CABLE CROSS-SECTION DIAMETER –0.6 TO 0.9 INCH STRENGTH – GRADE 270
BIRDCAGE FOR MIXING
HOUSING UNIT
WEDGE HOUSING CLOSE UP OF TEETH IN WEDGE ANCHORING INTO WIRE ROPE
SPECIAL THREADS OR TEETH
DYWIDAG CABLE BOLT ACTIVE SYSTEM
TENSIONING CABLE BOLT
TENSIONED CABLE BOLT
POST TENSION TENIONABLE CABLE BOLT
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
EPOXY COATING Central Strand Grit Surface Outer Strand Epoxy Coating
STRENGTH OF CABLE BOLTS
GRAPH OF (0.6 INCH ) EXCEL CABLE BOLT FAILURE
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
COMMON CABLE PLANS SUPPLEMENTAL SUPPORT HOLES USUALLY /8 DIA FT LENGTH FT RESIN LENGTH –( ONE MINE, 2 FT RESIN ) 4 CABLES PER ROW FT ROW SPACING SURFACE CONTROL, MATTS
CABLE BOLTS USED AS PRIMARY SUPPORT
LONGWALL GATE ENTRIES MINERS WITH INTERGAL BOLTERS ENTRY WIDTH FT JENNMAR CB CABLE BOLTS SHELL 4 FOOT FROM END 4 FOOT RESIN TWO CABLE BOLTS, MATT & CENTER BOLT
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
CABLE PLAN FOR HIGH HORIZONTAL STRESS
THE END