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TRUSSES. ROD TRUSSES U - BOLT TRUSS WHAT IS WRONG WITH THIS PICTURE ?

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Presentation on theme: "TRUSSES. ROD TRUSSES U - BOLT TRUSS WHAT IS WRONG WITH THIS PICTURE ?"— Presentation transcript:

1 TRUSSES

2

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4 ROD TRUSSES

5 U - BOLT TRUSS

6

7 WHAT IS WRONG WITH THIS PICTURE ?

8 TRUSS PROBLEMS

9 TRUSS MISAPPLICATION

10

11 DYWIDAG TENSIONABLE SLING

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13 ONE PIECE SLING

14 ONE PIECE INSTALLATION

15 ONE PIECE CABLE SLINGS

16 TWO PIECE CABLE TRUSS OR SLING

17 6 x 16 LOOP PLATE

18 BLOCK & BARREL-WEDGES

19 JACK OR WRENCH

20 TIGHTENING UP TRUSS

21 CLOSEUP OF BARREL & WEDGE

22

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24 FAILURE BROKEN WIRE

25 WEAK ROOF SLING

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27 PRESSURE vs APPLIED LOAD

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29 TRUSSES USED ON TAILGATES

30 CABLE BOLTS

31 WORST CASE

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36 EXCEL CABLE BOLT PASSIVE SYSTEM

37 NON-TENSIONED CABLE BOLT

38

39 CABLE CROSS-SECTION DIAMETER –0.6 TO 0.9 INCH STRENGTH – GRADE 270

40 BIRDCAGE FOR MIXING

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43 HOUSING UNIT

44 WEDGE HOUSING CLOSE UP OF TEETH IN WEDGE ANCHORING INTO WIRE ROPE

45 SPECIAL THREADS OR TEETH

46

47 DYWIDAG CABLE BOLT ACTIVE SYSTEM

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49 TENSIONING CABLE BOLT

50 TENSIONED CABLE BOLT

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60 POST TENSION TENIONABLE CABLE BOLT

61 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

62 EPOXY COATING Central Strand Grit Surface Outer Strand Epoxy Coating

63 STRENGTH OF CABLE BOLTS

64 GRAPH OF (0.6 INCH ) EXCEL CABLE BOLT FAILURE

65 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

66 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

67 CABLE BOLTS USED AS PRIMARY SUPPORT

68 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

69 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

70 CABLE PLAN FOR HIGH HORIZONTAL STRESS

71 THE END

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