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Transcript of DSI New Developments in Yieldable Rock Bolts · 2 PPT Mining DSI Ground Support, Inc. Dynatork Bolt...
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DSI New Developments in Yieldable Rock Bolts
2012 Dynamic Ground Support Application Symposium Thursday, September 13th, 2012
Renn Oler, Engineering DirectorDywidag Systems International (DSI) Underground Sys Inc.
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DSI Ground Support, Inc.Dynatork Bolt OverviewDesign CriteriaDynamic TestingStatic TestingConclusion
DSI Underground Systems
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DSI Underground Systems
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DSI Mining & Tunneling Locations
America Europe
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DSI Underground Systems
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ISO 9001/2000
DSI is committed to:Meeting our customers needsBeing innovative, efficient, quality- and safety-conscious Continuously improving our processes, products and services, and the skills of our employees
Certified according to ISO 9001/2000 since 1994
Highest quality standard from development to application
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777
83 basic patents193 patents registered worldwide
88 basic patents268 patents registered worldwide
DSI Patents
CONSTRUCTIONPost-Tensioning & GeotechnicsConcrete Accessories
UNDERGROUNDMining & Tunneling
Status: 2009-03
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DSI Dynatork Bolt– Overview
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Patent Pending
The purpose of the dynamic bolt is to transfer the dynamic load of a rock burst into the support system through the resin to rock interface.
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DSI Dynatork Bolt – Design Criteria
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Overcome the following market limitations:
• Thoroughly Mixing the Resin• Reduce Costs to the Mines• Decrease Quality Failures by limiting process and
excess components• Withstand up to 30kJ of impact energy with limited
deflection• Exceed the industry limit of 3 impacts
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DSI – Design Criteria
• Thorough resin mixing helix, patented design• Advanced resin mix and anchoring
ability • Controlled mix• Design utilizes the coefficient of
friction versus the requirement of controlling the friction with a coating.
• Reduce Costs to the Mines• Simple manufacturing method
• 2 components, one step process• Limiting Defects
• Simplistic Design
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DSI – Testing
Testing conducted at the CANMET facility.
• 1.5 – 2.5 tons dropped onto a plate
• drop height 1.5m • Height to Mass ratio
• Hole size of 31mm -34mm
• Drop weight of 1115 kg –2006 kg
pre and post impact
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DSI – Impact Results
Energy# of
ImpactsAverage
DisplacementAverage
Load
16.41 kJ +5 138 mm - 226 mm 7 - 13 tons
22.96 kJ 4 242 mm -300 mm 8 -12 tons
30 kJ 2 208 mm – 379 mm 12 -22 tons
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Visual Summary of Displacement
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Dynamic Results
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impact test result at 22.97 kJ (drop 2)
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Holding Force of 11 tons – 17 tons
Static Results
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DSI Dynatork Bolt – Dynamic Yielding Solution
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Dynamic Bolt Energy Absorption 15 kJ Tested 23 kJ Tested 30 kJ tested
1055 Modified SteelElongation 10%
Yield Strength 560 MPa 81,200 psiUltimate Tensile Strength 660 MPa 65,700 psiWasher Plate Dimensions 6 in x 6 in x ¼ in 7/16 in ‐ 1 in dome
Washer Plate Yield Strength 160 kN 36,000 psiSmooth Bar Diameter 19.05 mm 3/4 in
Hemispherical Pinnut (dia x len x hole dim) 46 mm x 18 mm x 19 mm
1055 Modified
Smooth Bar
Technologically Advanced – PatentedUnique Mixing Helix
Dome Plate