HI-TEN Strand Bolt High Pre-Tension

Physical Properties	Minimum	Typical
Yield Strength	480kN	500kN
Ultimate Tensile Strength	590kN	610kN
Uniform Elongation		3-4%
Mass Per Metre		2.87kg
Cable (Strand) Diameter		23.5mm

General Features

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 out-bye, to loads of up to 25 tonnes using the DSI Tensioner Unit.
The HI-TEN Strand Bolt is manufactured from 21 wire strand having 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 out-bye, 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.

Installation Guidelines

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 applied.
For further details refer to DSI's Tensioner Unit user instruction guide.

Standard Lengths & Packaging

Standard HI-TEN Strand Bolts lengths range from 4100mm to 10100mm.
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.

Notes

Only DSI rock bolt components should be used to enable the full performance of the bolt system to be obtained.
Stiffening tubes to assist in installation are also available.
DSI Mining Products Division is Quality Assured to ISO 9001:2000, Registration No.QAC/R61/0315.

PRINTED December 2006: All dimensions, weights, quantities and specifications are those applicable at the time of publication and may be amended from time to time.