HI-TEN Strand Bolt High Pre-Tension

Physical Properties

 

MinimumTypical
Yield Strength480kN500kN
Ultimate Tensile Strength590kN610kN
Uniform Elongation3-4%
Mass Per Metre2.87kg
Cable (Strand) Diameter23.5mm

 

 

General FeaturesInstallation Guidelines
  • The DSI HI-TEN Strand Bolt is a cable designed to be installed as a long rock bolt which is capable of being post-tensioned at the face, or outbye, to loads of up to 25 tonnes using the DSI Tensioner Unit.
  • The HI-TEN Strand Bolt is manufactured from 21 wire strand with a 12mm square for mixing chemical anchors, welded to one end of the strand.
  • The HI-TEN Strand Bolt has a special collar and segmented wedge, which can sustain collar loads of between 52 and 55 tonnes.
  • The HI-TEN Strand Bolt is designed for high pre-tensioning using a point anchor system. Full encapsulation up to 8.0m is obtainable depending on installation equipment available.
  • If full encapsulation is required, extra slow speed chemical anchors of 20 minutes set time are available. Refer to Section F for chemical anchor details.
  • The HI-TEN Strand Bolt can also be effectively used with cementitious grouts.
  • The HI-TEN Strand Bolt concept allows a longer than seam height bolt to be installed at up to 30° from the vertical at the face, or outbye, to supplement existing strata reinforcement. Compatible domed plates are available to be used with the HI-TEN Strand Bolt.
  • The HI-TEN Strand Bolt system is patent pending.
  • 28mm hole diameters are preferred.
  • Hole depth is critical. Hole depth should be approximately 155mm shorter than the bolt length. This allows for sufficient tail to fit accessories, roof plate, collar/wedges & Tensioner Unit.
  • After insertion of the chemical anchors, the bolt is rotated through the anchors while pushing the bolt, fully, to the back of the hole.
  • It is important to follow the chemical manufacturers recommended mixing and hold times as printed on the chemical anchor cartons. DO NOT OVER-MIX.
  • The tensioner unit is connected to the HI-TEN Strand Bolt and tension is applied.
  • For further details refer to DSI's Tensioner Unit user instruction guide.

 

Standard Lengths & PackagingNotes
  • Standard HI-TEN Strand Bolt lengths range from 4100 to 8100mm.
  • Collar/wedge assemblies are supplied separately to the bolt.
  • Non-standard requirements are available by negotiation.
  • 4100 to 8100mm long HI-TEN Strand Bolts are strapped in bundles of 50 and supplied on steel trays.
  • Assistance should be sought from DSI's Technical Service Engineers in selection of the correct HI-TEN Strand Bolt fittings for the application and correct product codes.
  • Only DSI rock bolt components should be used in order to obtain full performance of the bolt system.
  • Stiffening tubes to assist in installation are also available.
  • DSI's Mining Products Division is Quality Assured to ISO 9001:2000, Registration No.QAC/R61/0315.