jennmar rock bolts usage

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  • Bolt Systems

    The Self-Drilling bolt is a fully threaded hollow bar that initially serves as a drill rod, utilizing a lost bit. The thread is made to comply to ISO 10208. For use in unconsolidated ground or other difficult ground conditions.

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  • Rock Bolts M24 JX Torque Tension Bolt - Jennmar

    2021-3-16u2002·u2002www.jennmar.com.au 7 Rock Bolts M24 JX Torque Tension Bolt Features: • The preferred primary roof support bolt by Australian coal mines • The 'X' grade steel used by JENNMAR has a superior toughness and ductility through the use of grain refining alloys.

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  • Grouts & Resins Usage

    Cable Bolt Grouts. • PUR70 is pumped (bottom up) into Fully- Grouted Cable Bolts (FGCB) to provide corrosion protection and improve bolt life. • TDS-240 is a urea silicate (top down) grout which is used when high early strength is required as in longwall recoveries. Full strength is achievable in 4 hours.

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  • Rock Bolts SR Bolt - Jennmar Australia

    2021-3-3u2002·u2002Rock Bolts SR Bolt SR Rock Bolt Property Minimum Value Typical Value Yield strength (kN) 228 246 Ultimate Tensile strength (kN) 310 348 Shear Strength (kN) 213 243 Elongation % 15 19 Bar core diameter (mm) 21.5 21.7 Cross sectional area (mm2) 363 378 Mass/meter (kg/m) 2.8 3.0 Drill Hole size (mm) 45 Features: • The SR Bolt rock bolt is a ...

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  • JENNMAR

    From bolts and beams to channels and trusses, to resin and rebar, JENNMAR is proud to manufacture products that make Coal & Hard Rock Mining, Tunneling, Civil, and Construction safer and more efficient. JENNMAR Product Catalog. JENNMAR Product Catalog.

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  • ROCK BOLTS J-TECH '25MM THREAD BAR' - Jennmar

    2021-3-3u2002·u2002ROCK BOLTS Various torque rated shear pin break-out nuts available for use on J-Tech 25mm bolts *Patent Pending Resin Shredder • Dome nut design allows the use of a standard 36mm A.F. tightening spanner • Hanger nuts load rated at 2 and 3 tonne • Supplied with KANGA PLATE which collapses when the bolt goes into yield

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  • Temporary Rock Bolts M24 High Tensile Temporary Rock Bolt

    2021-3-3u2002·u2002www.jennmar.com.au 27 M24 High Tensile Temporary Rock Bolt Temporary Rock Bolts Features: • M24 'X' grade steel bar Gr. 650/890MPa, supplied by Jennmar has superior toughness and ductility through the use of grain refining alloys. The Jennmar 'X' grade bolts should provide better performance in mines where Stress

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  • Bolts & Cable Bolts Accessories

    JENNMAR offers a complete line of cable support products. These products are based on a 7-strand, high-strength cable. JENNMAR offers an industry-leading line of cable products including non-tensioned cables, post-tensioned cables, tensionable cables for primary roof support, and fully-grouted cables. View Details.

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  • MPA Bolt System

    MPA Bolt System. Fast, single-step anchoring system using standard equipment. Efficient installation since drilling and grouting can be performed in a single operation, saving both time and money. • 32 mm, Self-Drilling, Hollow-Core Bolt. • Threaded both ends (39 in. & 24 in.) • 39' yield zone with up to 20% elongation.

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  • MPA Bolt System

    MPA Bolt System. Fast, single-step anchoring system using standard equipment. Efficient installation since drilling and grouting can be performed in a single operation, saving both time and money. • 32 mm, Self-Drilling, Hollow-Core Bolt. • Threaded both ends (39 in. …

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  • ACCC releases SoI on proposed acquisition of Jennmar ...

    2016-4-21u2002·u2002Rock bolts are rods which are inserted into the rock to hold it together. DSI and Jennmar supply rock bolts for use in soft rock mines (coal mines) and hard rock mines (such as gold, copper, zinc and diamonds). They also supply ancillary products including resins and cementitious grout (which can be used to anchor bolts in the rock) and mesh ...

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  • BREAKABLE ROCK BOLT - JENNMAR CORPORATION

    3. A rock bolt according to claim 1, wherein the rod is of reduced thickness in said breaking zone as compared to other portions of the rod. 4. A rock bolt according to claim 2, wherein the rod is profiled at the breaking zone to incorporate at least one groove. 5. A rock bolt according to claim 4, wherein the groove is continuous about the rod. 6.

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  • Design, development and testing of the JTech bolt for

    Design, development and testing of the JTech bolt for use in static, quasi-static and dynamic domains T. Roberts Jennmar Australia Pty Ltd, Australia A. Dodds Jennmar Australia Pty Ltd, Australia Abstract Designing a rock reinforcement element requires knowledge of geomechanical behaviour, interaction of …

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  • Jennmar - The Tunnelling Journal

    Our primary product roster includes M3® expandable rock bolts, FRICTION-LOK® stabilizer systems, Fast Anchors™ DCP Bolts, steel sets, steel tunnel ribs & shaft rings, lattice girders, rail ties, resins and with our alliance partners, Contech, we also provide 2-flange liner plate. Contact Details. Jennmar 258 Kappa Drive Pittsburgh PA 15238

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  • Development and evaluation of corrosion resistant coating ...

    2018-1-1u2002·u2002Expandable rock bolt (Python by Jennmar). However, support capacity and service life of an expandable rock bolt can be significantly reduced if the metallic body is subjected to corrosion. Grounds containing sulfur or chloride content, when exposed to air and water, can produce acidic environments, which quickly initiates metal corrosion and ...

    Get Price
  • Working At Jennmar - Zippia

    2021-7-8u2002·u2002Jennmar Corporation develops and manufactures ground control products for mining, tunneling, and civil construction industries. It offers primary roof/rib support and rock reinforcement products, such as bendable bolts, cable bolts, spring-loaded shells, combination bolt systems, conventional bolts, cuttable and corrosion resistant products, headed rebar bolts, bolt anchor systems, …

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  • Jennmar to launch new facilities, bolts and own resin ...

    2006-12-13u2002·u2002The new facilities will give Jennmar the capacity to manufacture its new galvanised cable bolt and a number of other products currently being developed. About to begin manufacturing now, the galvanised bolt is a new version of the super strand cable bolt …

    Get Price
  • Jennmar sets up shop in Northern Ontario - Sudbury

    2008-12-1u2002·u2002Jennmar is building a 50,000-square foot plant with an additional 6,000 square feet for offices. The facility will employ between 60 and 90 people, and manufacture the full range of ground support accessories, including rock bolts, cable bolts and …

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  • Mechanical Rock Bolts - DSI Underground Canada

    0.40' (10.16 mm) Thread Size (left and right) I. All Bolts. 5/8'- 11 UNC. 3/4'- 10 UNC. 7/8'-9 UNC. All dimensions in accordance with ASTM F432 & CSA M430-90 specifications. Technical Data. C1060 Steel.

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  • Rock Bolting - WOMP

    2017-7-24u2002·u2002They had the rock tested using their lads and labs outside the company. After three to four months, they identified the culprit, and developed a corrosion-resistant coating for the inflatable bolts. Jennmar's version of the inflatable friction stabilizer is the PythonM3 with PyFlexU2 coating.

    Get Price
  • ACCC releases SoI on proposed acquisition of Jennmar ...

    2016-4-21u2002·u2002Rock bolts are rods which are inserted into the rock to hold it together. DSI and Jennmar supply rock bolts for use in soft rock mines (coal mines) and hard rock mines (such as gold, copper, zinc and diamonds). They also supply ancillary products including resins and cementitious grout (which can be used to anchor bolts in the rock) and mesh ...

    Get Price
  • High capacity yielding bolt support for rockburst prone ...

    The Yield-Lok bolt (WIPO, 2011) was developed by Jennmar of Canada for ground support in rock prone to seismic burst conditions (Wu and Oldsen, 2010). When exposed to high energy impact loading, standard bolts fail in tension or pull through end support plates. Previous yield …

    Get Price
  • Design, development and testing of the JTech bolt for

    Design, development and testing of the JTech bolt for use in static, quasi-static and dynamic domains T. Roberts Jennmar Australia Pty Ltd, Australia A. Dodds Jennmar Australia Pty Ltd, Australia Abstract Designing a rock reinforcement element requires knowledge of geomechanical behaviour, interaction of …

    Get Price
  • Jennmar Australia

    The bolt is designed to be installed by Jumbo into a standard 35mm diameter borehole. Jennmar's Shotcrete Depth Indicator was developed to counteract the challenges that surface when installing rockbolts and the application of shotcrete to secure underground …

    Get Price
  • Jennmar - The Tunnelling Journal

    Our primary product roster includes M3® expandable rock bolts, FRICTION-LOK® stabilizer systems, Fast Anchors™ DCP Bolts, steel sets, steel tunnel ribs & shaft rings, lattice girders, rail ties, resins and with our alliance partners, Contech, we also provide 2-flange liner plate. Contact Details. Jennmar 258 Kappa Drive Pittsburgh PA 15238

    Get Price
  • Mechanical Rock Bolts - DSI Underground Canada

    0.40' (10.16 mm) Thread Size (left and right) I. All Bolts. 5/8'- 11 UNC. 3/4'- 10 UNC. 7/8'-9 UNC. All dimensions in accordance with ASTM F432 & CSA M430-90 specifications. Technical Data. C1060 Steel.

    Get Price
  • JENNMAR Australia

    Jennmar Australia is the distributor of the resins manufactured by J-Lok Resins, used to secure its bolts into the roof strata. The resin capsule manufacturing operation was established in 2008 as ...

    Get Price
  • Determining Rock Bolt or Anchor Tension Using a

    2016-7-19u2002·u2002on the rock bolt to rotate. Using the tension-to-torque ratio of the calibrated torque wrench, determine the tension in the rock bolt. 4. Significance and Use 4.1 Performance.-Rock bolts are used for support in a variety of engineering applications. This test provides a quantitative measure of the performance of a rock bolt or its anchor. 4.2 ...

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  • DSI's proposed acquisition of Jennmar Australia - DSI

    2016-7-22u2002·u2002DSI's proposed acquisition of Jennmar Australia. 22nd July 2016. In February 2016, DSI announced that it had signed agreements to acquire Jennmar's businesses outside the US, and to sell its US Mining business to Jennmar. The acquisitions in Latin America, Europe and China (50%), and the sale of the US Mining business, were completed in the ...

    Get Price
  • Development and evaluation of corrosion resistant coating ...

    2018-1-1u2002·u2002Expandable rock bolt (Python by Jennmar). However, support capacity and service life of an expandable rock bolt can be significantly reduced if the metallic body is subjected to corrosion. Grounds containing sulfur or chloride content, when exposed to air and water, can produce acidic environments, which quickly initiates metal corrosion and ...

    Get Price
  • Jennmar Australia

    The bolt is designed to be installed by Jumbo into a standard 35mm diameter borehole. Jennmar's Shotcrete Depth Indicator was developed to counteract the challenges that surface when installing rockbolts and the application of shotcrete to secure underground strata, a daily practice in many hard rock mines.

    Get Price
  • International Journal of Mining Science and Technology

    Expandable rock bolt (Python by Jennmar). Fig. 2. Coating cracks due to bolt inflation (Omega-AP). 146 K.J. Ma et al./International Journal of Mining Science and Technology 28 (2018) 145–151.

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  • Design, development and testing of the JTech bolt for use ...

    Abstract: Designing a rock reinforcement element requires knowledge of geomechanical behaviour, interaction of the reinforcement element with rock mass, and the element's mechanistic response in static and dynamic environments. Using this knowledge, the JTech bolt was developed and subjected to a thorough program to test, gather data and validate the bolt performance in …

    Get Price
  • DSI's proposed acquisition of Jennmar Australia - DSI ...

    2016-7-22u2002·u2002In February 2016, DSI announced that it had signed agreements to acquire Jennmar's businesses outside the US, and to sell its US Mining business to Jennmar. The acquisitions in Latin America, Europe and China (50%), and the sale of the US Mining business, were completed in the first quarter of this year.

    Get Price
  • DSI's proposed acquisition of Jennmar Australia - DSI ...

    2016-7-22u2002·u2002In February 2016, DSI announced that it had signed agreements to acquire Jennmar's businesses outside the US, and to sell its US Mining business to Je...

    Get Price
  • JENNMAR Australia

    Jennmar Australia is the distributor of the resins manufactured by J-Lok Resins, used to secure its bolts into the roof strata. The resin capsule manufacturing operation was established in 2008 as a joint venture between Jennmar Corporation and Stratabolt Resins. To complete the total solution offered to mines, Jennmar positions its team of ...

    Get Price
  • Jennmar to launch new facilities, bolts and own resin ...

    2006-12-13u2002·u2002The new facilities will give Jennmar the capacity to manufacture its new galvanised cable bolt and a number of other products currently being developed. About to begin manufacturing now, the galvanised bolt is a new version of the super strand cable bolt – already in wide use throughout the longwall sector.

    Get Price
  • Tensionable cable bolt - Jennmar Corporation

    1998-2-6u2002·u2002A conventional mechanical anchor such as the J8 7/8 available from Jennmar Corporation of Pittsburgh, Pa. (as disclosed in U.S. Pat. No. 5,244,314) may be used in a slightly modified form to accommodate the larger diameter finer threads. In particular, the plug of the J8 7/8 mechanical anchor may be modified for use on the bolt 10.

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  • Normet Self-Drilling Dynamic Bolt SDDB® - Self Drilling ...

    The anchors are loaded when the rock dilates with the smooth sections between the anchors stretching, which is the same principle of the standard D-Bolt®. Both type of Self-Drilling Dynamic Bolt SDDB® can be post grouted with conventional cementitious grouts or with specially designed pumpable resin such as TamPur RBG (Rock Bolt Grout).

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  • Rock Bolting - WOMP

    2017-7-24u2002·u2002They had the rock tested using their lads and labs outside the company. After three to four months, they identified the culprit, and developed a corrosion-resistant coating for the inflatable bolts. Jennmar's version of the inflatable friction stabilizer is the PythonM3 with PyFlexU2 coating.

    Get Price
  • ACCC releases SoI on proposed acquisition of Jennmar ...

    2016-4-21u2002·u2002Rock bolts are rods which are inserted into the rock to hold it together. DSI and Jennmar supply rock bolts for use in soft rock mines (coal mines) and hard rock mines (such as gold, copper, zinc and diamonds). They also supply ancillary products including resins and cementitious grout (which can be used to anchor bolts in the rock) and mesh ...

    Get Price
  • High capacity yielding bolt support for rockburst prone ...

    The Yield-Lok bolt (WIPO, 2011) was developed by Jennmar of Canada for ground support in rock prone to seismic burst conditions (Wu and Oldsen, 2010). When exposed to high energy impact loading, standard bolts fail in tension or pull through end support plates. Previous yield …

    Get Price
  • Design, development and testing of the JTech bolt for

    Design, development and testing of the JTech bolt for use in static, quasi-static and dynamic domains T. Roberts Jennmar Australia Pty Ltd, Australia A. Dodds Jennmar Australia Pty Ltd, Australia Abstract Designing a rock reinforcement element requires knowledge of geomechanical behaviour, interaction of …

    Get Price
  • Jennmar Australia

    The bolt is designed to be installed by Jumbo into a standard 35mm diameter borehole. Jennmar's Shotcrete Depth Indicator was developed to counteract the challenges that surface when installing rockbolts and the application of shotcrete to secure underground …

    Get Price
  • Jennmar - The Tunnelling Journal

    Our primary product roster includes M3® expandable rock bolts, FRICTION-LOK® stabilizer systems, Fast Anchors™ DCP Bolts, steel sets, steel tunnel ribs & shaft rings, lattice girders, rail ties, resins and with our alliance partners, Contech, we also provide 2-flange liner plate. Contact Details. Jennmar 258 Kappa Drive Pittsburgh PA 15238

    Get Price
  • Mechanical Rock Bolts - DSI Underground Canada

    0.40' (10.16 mm) Thread Size (left and right) I. All Bolts. 5/8'- 11 UNC. 3/4'- 10 UNC. 7/8'-9 UNC. All dimensions in accordance with ASTM F432 & CSA M430-90 specifications. Technical Data. C1060 Steel.

    Get Price
  • JENNMAR Australia

    Jennmar Australia is the distributor of the resins manufactured by J-Lok Resins, used to secure its bolts into the roof strata. The resin capsule manufacturing operation was established in 2008 as ...

    Get Price
  • Determining Rock Bolt or Anchor Tension Using a

    2016-7-19u2002·u2002on the rock bolt to rotate. Using the tension-to-torque ratio of the calibrated torque wrench, determine the tension in the rock bolt. 4. Significance and Use 4.1 Performance.-Rock bolts are used for support in a variety of engineering applications. This test provides a quantitative measure of the performance of a rock bolt or its anchor. 4.2 ...

    Get Price
  • DSI's proposed acquisition of Jennmar Australia - DSI

    2016-7-22u2002·u2002DSI's proposed acquisition of Jennmar Australia. 22nd July 2016. In February 2016, DSI announced that it had signed agreements to acquire Jennmar's businesses outside the US, and to sell its US Mining business to Jennmar. The acquisitions in Latin America, Europe and China (50%), and the sale of the US Mining business, were completed in the ...

    Get Price
  • DSI has signed agreements to acquire Jennmar businesses ...

    2016-2-3u2002·u2002DSI to acquire Jennmar businesses in Australia, Europe, Latin America and China (50% share) Jennmar to acquire DSI US Mining business Customers will b...

    Get Price
  • Design, development and testing of the JTech bolt for use ...

    Abstract: Designing a rock reinforcement element requires knowledge of geomechanical behaviour, interaction of the reinforcement element with rock mass, and the element's mechanistic response in static and dynamic environments. Using this knowledge, the JTech bolt was developed and subjected to a thorough program to test, gather data and validate the bolt performance in …

    Get Price
  • Patents Assigned to Jennmar Corporation - Justia Patents ...

    1990-5-4u2002·u2002Assignee: Jennmar Corporation. Inventors: Jerry E. Frease, John C. Stankus, Eugene H. Stewart, Glen S. Grissinger. Expansion assembly for mine roof bolts. Patent number: 5078547. Abstract: An improved expansion assembly for a mine roof bolt adapted for use in a 11/2' diameter bore hole with a 1' roof bolt. The expansion assembly has a plug with ...

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  • Mechanical Rock Bolts - DSI Underground

    Rock Bolt Dollies - Rock bolt installation dollies should only transfer rotational energy to the rock bolt during installation, not percussive energy, when stopers and jacklegs are used.The shank end of the dollie must be short enough to avoid contact with the drill piston. Typically, these rock bolt dollies have a 7/8' hex shank and are only 31/4' long.

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  • Principles of rockbolting design - ScienceDirect

    2017-6-1u2002·u20021. Introduction. Rockbolt is the most widely used support element in support systems in underground mines and civil tunnels. Rockbolting design is indeed mainly based on experience and it appears that rockbolting design is simply a business of selection of rockbolt types and the determination of bolt length and spacing, but, one essentially uses, either explicitly or implicitly, a …

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  • Kinloc Bolt - DSI Underground Australia - Rock Bolts

    Standard bolt lengths range from 1500mm to 3000mm in 300mm increments. Non-standard lengths are available on application. Kinloc Bolts are supplied in standard packs of 150 bolts. Notes. Only DSI Underground rock bolt components should be used to enable the optimum performance of the bolt system to be obtained.

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  • Rockbolts - an overview

    Rockbolts exposed in underground mines provide us information on the loading conditions, failure modes, and how the rockbolts behaved in fractured rockmasses (Li, 2010). Fig. 3.4.1 shows a fully cement encapsulated rockbolt and fractures exposed on an excavation face in a cut-and-fill mine drift. The bolt was installed in the roof of the previous cut slice and exposed on the face of the ...

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  • Rock Anchoring and Bolt Systems

    2020-2-29u2002·u2002An economical, medium strength rod used for tie downs, and rock reinforcement. Use AR Expansion cone shell anchor series for blind hole and prestressed rebar anchor applications. Use 2 tubes for complete grouting. One tube pumps grout to the back of the borehole and the other acts as a vent. The grouting tube is affixed to the rod to a point ...

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  • DSI's proposed acquisition of Jennmar Australia - DSI Civil

    2016-7-22u2002·u2002In February 2016, DSI announced that it had signed agreements to acquire Jennmar's businesses outside the US, and to sell its US Mining business to Jennmar. The acquisitions in Latin America, Europe and China (50%), and the sale of the US Mining business, were completed in the first quarter of this year.

    Get Price
  • Rock Bolts - Roof Bolts - Resin Anchoring - DSI ...

    DSI (DSI) is Australia's largest manufacturer & supplier of specialist strata reinforcement & support products to the underground coal & metalliferous mining sectors.DSI is also a major exporter of these products to the Asia-Pacific Region.

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