Patents Assigned to Dywidag-Systems International Pty Limited
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Patent number: 11236613Abstract: An encapsulation system for use in securing a rock bolt in a bore hole drilled into a rock face to be stabilised, the encapsulation system comprising at least two separate encapsulation mediums and one or more elongate cartridges containing the encapsulation mediums, each the cartridge having a frangible casing, the encapsulation mediums including: a first encapsulation medium comprising a curable first resin formulation; and a second encapsulation medium; wherein, following use in securing a rock bolt, the second encapsulation medium has a lower bond strength and/or a lower compressive strength than the first resin formulation.Type: GrantFiled: September 7, 2018Date of Patent: February 1, 2022Assignee: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITEDInventors: David William Evans, Derek Colin Hird
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Publication number: 20200300089Abstract: An encapsulation system (100) for use in securing a rock bolt in a bore hole drilled into a rock face to be stabilised, said encapsulation system comprising at least two separate encapsulation mediums (112,122) and one or more elongate cartridges (110,120) containing said encapsulation mediums (112,122), each said cartridge having a frangible casing (111,121), said encapsulation mediums including: a first encapsulation medium (112) comprising a curable first resin formulation; and a second encapsulation medium (122); wherein, following use in securing a rock bolt, said second encapsulation medium has a lower bond strength and/or a lower compressive strength than said first resin formulation.Type: ApplicationFiled: September 7, 2018Publication date: September 24, 2020Applicant: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITEDInventors: David William EVANS, Derek Colin HIRD
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Patent number: 10066483Abstract: A friction bolt assembly has a tubular friction bolt body defining a cavity and having a split. A rod extends through the cavity. An expansion element is mounted on the rod at or toward the rod leading end and protrudes through the friction bolt body leading end. The expansion element has an engagement surface tapering toward the rod trailing end. A drive head is mounted on the rod at or adjacent the rod trailing end. The rod is actuatable by rotation of the drive head to draw the expansion element toward the friction bolt body trailing end such that the engagement surface engages the friction bolt body, radially outwardly deforming the friction bolt body.Type: GrantFiled: July 29, 2014Date of Patent: September 4, 2018Assignee: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITEDInventors: David William Evans, Derek Colin Hird
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Publication number: 20110002746Abstract: A method of assessing a multilayer strata (1) for rock bolt installation through a strata face (2) of said strata (1), comprises measuring potential differences between a first layer (3) of the strata (1) and each of one or more further layers (4, 5, 6, 7) of the strata (1).Type: ApplicationFiled: June 11, 2010Publication date: January 6, 2011Applicant: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITEDInventor: David W. Evans
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Patent number: 7458242Abstract: An apparatus for manufacturing a cable bolt from a cable (1) includes first and second clamps (2, 3) adapted to releasably clamp the cable (1) with the cable (1) extending along the longitudinal axis (4) of the apparatus. A first cable displacement device (12) longitudinally displaces the first clamp (2) relative to the second clamp (3) along the longitudinal axis (4). A first clamp rotation device (14) rotates the first clamp (2) relative to the second clamp (3) about the longitudinal axis (4). The apparatus also has a second clamp displacement device (19) for simultaneously longitudinally displacing the first and second clamps (2, 3) along the longitudinal axis (4).Type: GrantFiled: September 6, 2005Date of Patent: December 2, 2008Assignee: Dywidag-Systems International Pty LimitedInventors: Mieczyslaw S. Rataj, Alan Henderson, Albert Taylor
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Patent number: 7338234Abstract: A rock bolt (1) comprises a tubular body (4) defining a tubular bore (5) for receiving an adhesive or cement filled cartridge (18). A plug (8) is mounted in the bore (5). The plug (8) is displaceable along the bore (5) and sealingly engages the tubular body (4). A bolt head (7) is located at or adjacent a second end (3) of the rock bolt (1). A detent arrangement (10, 12) restrains the plug (8) in a position adjacent an opening at the first end (2) of the rock bolt (1).Type: GrantFiled: December 16, 2005Date of Patent: March 4, 2008Assignee: Dywidag-Systems International Pty LimitedInventors: Mieczyslaw Stanislaw Rataj, Andrew Boychuk
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Publication number: 20060153645Abstract: A rock bolt (1) comprises a tubular body (4) defining a tubular bore (5) for receiving an adhesive or cement filled cartridge (18). A plug (8) is mounted in the bore (5). The plug (8) is displaceable along the bore (5) and sealingly engages the tubular body (4). A bolt head (7) is located at or adjacent a second end (3) of the rock bolt (1). A detent arrangement (10, 12) restrains the plug (8) in a position adjacent an opening at the first end (2) of the rock bolt (1).Type: ApplicationFiled: December 16, 2005Publication date: July 13, 2006Applicant: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITEDInventors: Mieczyslaw Rataj, Andrew Boychuk
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Publication number: 20060054748Abstract: An apparatus for manufacturing a cable bolt from a cable (1) includes first and second clamps (2, 3) adapted to releasably clamp the cable (1) with the cable (1) extending along the longitudinal axis (4) of the apparatus. A first cable displacement device (12) longitudinally displaces the first clamp (2) relative to the second clamp (3) along the longitudinal axis (4). A first clamp rotation device (14) rotates the first clamp (2) relative to the second clamp (3) about the longitudinal axis (4). The apparatus also has a second clamp displacement device (19) for simultaneously longitudinally displacing the first and second clamps (2, 3) along the longitudinal axis (4).Type: ApplicationFiled: September 6, 2005Publication date: March 16, 2006Applicant: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITEDInventors: Mieczyslaw Rataj, Alan Henderson, Albert Taylor