US20070009330A1 - Mine roof cable bolt and method - Google Patents

Mine roof cable bolt and method Download PDF

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Publication number
US20070009330A1
US20070009330A1 US11/452,494 US45249406A US2007009330A1 US 20070009330 A1 US20070009330 A1 US 20070009330A1 US 45249406 A US45249406 A US 45249406A US 2007009330 A1 US2007009330 A1 US 2007009330A1
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US
United States
Prior art keywords
bolt
cable
head
mine roof
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/452,494
Inventor
Frank Locotos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
F M Locotos Co Inc
Original Assignee
F M Locotos Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US69166405P priority Critical
Application filed by F M Locotos Co Inc filed Critical F M Locotos Co Inc
Priority to US11/452,494 priority patent/US20070009330A1/en
Assigned to F.M. LOCOTOS CO., INC. reassignment F.M. LOCOTOS CO., INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LOCOTOS, FRANK M.
Publication of US20070009330A1 publication Critical patent/US20070009330A1/en
Abandoned legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • E21D20/02Setting anchoring-bolts with provisions for grouting
    • E21D20/025Grouting with organic components, e.g. resin
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/006Anchoring-bolts made of cables or wires

Abstract

A mine roof bolt for use with resin including a strand cable. The bolt includes a head mechanism attached to the strand cable which preferably allows the strand cable to be turned in a first direction for mixing the resin and in a second direction opposite the first direction for tensioning the strand cable in the mine roof; although mixing and tightening can occur in the same direction. A method for placing a mine roof bolt in a mine roof.

Description

    FIELD OF THE INVENTION
  • The present invention is related to a mine roof bolt. More specifically, the present invention is related to a mine roof bolt for use with resin that comprises a multi strand cable that is preferably spun in a first direction for mixing the resin and in a second direction opposite the first direction to tension the cable, although spinning in the same direction for mixing and tensioning can also be used.
  • BACKGROUND OF THE INVENTION
  • In regard to the prior art using rigid tension rebar bolts, the method to mix the resin was by turning in one direction to mix, then the opposite direction to tension the system. The prior art teaches several stop mechanisms which are different.
  • U.S. Pat. No. 5,378,087—This patent has to do with straight insertion using a static mixer on top. No spinning or turning to mix resin.
  • U.S. Pat. No. 6,039,509—This patent teaches a method for mixing by turning the cable, however, it doesn't say turning one way first to mix resin, then the opposite way to tension.
  • U.S. Pat. Nos. 5,375,946 and 5,647,694—These patents mix and tension in one direction simultaneously. They are different in that they both use an expansion shell at the top of bolt.
  • Previous Methods to Mix Resin Using Stiff Rebar Inclused:
      • 1. Delay nuts—such as a dome nut, shear-pin nut, and a tab-nut which prevents the thread from moving through the nut during mixing, all of these had mixing and tensioning occurring with movement of the tensioning device in one direction.
      • 2. McDowell System—uses mixing in one direction and then tensioning in the other direction. The means to prevent movement of the nut off the thread is by damaging the thread at the end of the bolt.
      • 3. Jim Earl System—uses a one-half nut welded at the end of the threads of a rebar as a stop means during mixing backwards, similar to McDowell.
    BRIEF SUMMARY OF THE INVENTION
  • The present invention pertains to a mine roof bolt for use with resin. The bolt comprises a strand cable. The bolt comprises a head mechanism attached to the strand cable which allows the strand cable to be turned in a first direction for mixing the resin and in a second direction opposite the first direction for tensioning the strand cable in the mine roof.
  • The present invention pertains to a mine roof bolt for use with resin. The bolt comprises a strand cable. The bolt comprises means for allowing the strand cable to be turned in a first direction for mixing the resin and in a second direction opposite the first direction for tensioning the strand cable in the mine roof.
  • The present invention pertains to a method for placing a mine roof bolt in a mine roof. The method comprises the steps of placing a resin cartridge in a bore hole in the mine roof. There is the step of inserting the strand cable of the bolt into the borehole so it pierces the cartridge. There is the step of rotating a head mechanism of the bolt attached to the strand cable in a first direction to rotate the strand cable and mix the resin. There is the step of rotating the head mechanism in a second direction opposite the first direction to tension the cable bolt in the mine roof.
  • The present invention is a mine roof bolt for use in a bore hole of a mine with resin. The bolt comprises a strand cable. The bolt comprises a head mechanism attached to the strand cable. The head mechanism includes a hollow fixture made from hot rolled all thread bar threaded on the outside through which the cable extends and to which the cable is attached, and a nut threaded to the fixture.
  • BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
  • In the accompanying drawings, the preferred embodiment of the invention and preferred methods of practicing the invention are illustrated in which:
  • FIG. 1 is a schematic representation of a mine roof bolt of the present invention.
  • FIG. 2 is a schematic representation of a bottom end of a mine roof bolt of the present invention.
  • FIG. 3 is a schematic representation of an invention tool with a mine roof bolt of the present invention.
  • DETAILED DESCRIPTION OF THE INVENTION
  • Referring now to the drawings wherein like reference numerals refer to similar or identical parts throughout the several views, and more specifically to FIGS. 1-3 thereof, there is shown a mine roof bolt for use with resin. The bolt comprises a strand cable. The bolt comprises a head mechanism attached to the strand cable which allows the strand cable to be turned in a first direction for mixing the resin and in a second direction opposite the first direction for tensioning the strand cable in the mine roof.
  • Preferably, the head mechanism includes a hollow fixture 4 threaded on the outside through which the cable extends and to which the cable is attached. The fixture is preferably made from hot rolled all thread bar, described in ASTM A615, incorporated by reference herein. The head mechanism preferably includes a nut 5 threaded to the fixture 4. Preferably, the fixture 4 has a bottom portion which is beveled internally.
  • The head mechanism preferably includes wedges 7 which are disposed in the beveled portion to grip the cable. Preferably, the fixture 4 has an upper end 15 which is swagged to the cable, although it does not have to be swagged. The head mechanism preferably includes a stop mechanism disposed between the end of the fixture 4 and the wedges 7 to prevent the nut 5 from coming off as the fixture 4 is spun backwards opposite of its threads to cause the cable to mix the resin.
  • The present invention pertains to a mine roof bolt for use with resin. The bolt comprises a strand cable. The bolt comprises means for allowing the strand cable to be turned in a first direction for mixing the resin and in a second direction opposite the first direction for tensioning the strand cable in the mine roof.
  • The allowing means is shown in FIGS. 1-3.
  • The present invention pertains to a method for placing a mine roof bolt in a mine roof. The method comprises the steps of placing a resin cartridge 3 in a bore hole in the mine roof. There is the step of inserting the strand cable of the bolt into the borehole so it pierces the cartridge. There is the step of rotating a head mechanism of the bolt attached to the strand cable in a first direction to rotate the strand cable and mix the resin. There is the step of rotating the head mechanism in a second direction opposite the first direction to tension the cable bolt in the mine roof.
  • Preferably, there is the step of spinning the fixture 4 of the head mechanism in a direction opposite of threads on the fixture 4. The spinning step preferably includes the step of preventing a nut 5 of the head mechanism from coming off with a stop mechanism of the head mechanism. Preferably, the rotating in a second direction step includes the step of turning the nut 5 in the second direction after the resin has set to tension the bolt.
  • The present invention includes a method to install a cable bolt with tension. It also has specific hardware (a stop washer 6) and the manner in which it is placed.
  • The method preferably is to mix in one direction and tension in the opposite direction using a cable bolt.
  • The present invention is a mine roof bolt for use in a bore hole of a mine with resin. The bolt comprises a strand cable. The bolt comprises a head mechanism attached to the strand cable. The head mechanism includes a hollow fixture made from hot rolled all thread bar threaded on the outside through which the cable extends and to which the cable is attached, and a nut threaded to the fixture.
  • Preferably, the fixture has a bottom portion which is beveled internally. The head mechanism preferably includes wedges which are disposed in the beveled portion to grip the cable.
  • The present invention pertains to a method for placing a mine roof bolt in a mine roof. The method comprises the steps of placing a resin cartridge in a bore hole in the mine roof. There is the step of inserting the strand cable of the bolt into the borehole so it pierces the cartridge. There is the step of rotating a head mechanism of the bolt attached to the strand cable in a first direction to rotate the strand cable and mix the resin. There is the step of stopping the rotation of the head mechanism. There is the step of rotating the head mechanism in the first direction to tension the cable bolt in the mine roof. Preferably, the stopping step lasts long enough for the mixed resin to set.
  • In the operation of the preferred embodiment, the bolt has a stop washer 6 that prevents the nut 5 from coming off during mixing. This washer 6 is held in place by the action of the wedges 7 seating inside the end of the fixture 4. The washer I.D. is the same or slightly larger than the diameter of the entrance to the fixture 4. Since the wedges 7 are tapered and become larger than the entrance diameter and washer I.D., this interference fit holds the washer in place. A roof bolting machine attaches to the insertion tool to spin and tension the bolt, as shown in FIG. 3.
  • In the prior art, shown on rigid rebar, the stop mechanism is different, either by: 1) damaging the threads at the end; or, 2) by fixing a thin nut on the end of the threads the main nut is prevented from coming off during mixing in the opposite direction.
  • A multi-strand cable 1 with any of several means of mixing resin 9 in a cartridge 3 attached to the leading end is inserted into a drilled hole 10 in the roof of a mine or tunnel containing the resin. The second or bottom end has a fixture 4 attached to the cable which is threaded on the outside and has a nut 5 threaded to it. A drilled out threaded rebar rod is used as a fixture 4 to hold the cable. These threads 35 on the rebar are manufactured during rolling of the rod in a steel mill versus cut or roll threading a round rod. Examples could be a Dywidag or SAS rod. These threads 35 of a hot rolled all thread bar are better than rolled or cut threads since they do not damage in rough handling in a mine. The threaded fixture 4 is hollow and accepts the strand cable 1. The head mechanism could also be a casting made in a foundry.
  • The bottom portion of the fixture 4 is beveled internally to accept wedges 7 which grip the swagged mechanically to the cable. A washer 6 (preferably round) is placed as a stop member between the end of the fixture 4 and the wedges 7. The washer can be held by the wedges 7 as an interference fit (between wedges 7 and end of all thread bar-fixture 4), or can be attached to the end of the fixture 4, such as welding to hold it on. The washer provides a flat surface 16 to contact the nut 5 face as a stop means. This may be held in several other means such as welding to the fixture 4. A deep wall socket 13 is used to insert the bolt and spin the resin. The stop washer 6 prevents the nut 5 from coming off as the bolt is spun backwards (opposite of its threads) to mix the resin. After spinning backwards to mix resin, the bolt is held in place until the resin sets, then the nut 5 is turned the other direction to tension the bolt from the nut 5 to the resin anchorage zone.
  • If it is desired to mix and tighten in the same direction, this can be accomplished for example by using U.S. Pat. No. 5,526,720, incorporated by reference herein, which features a spring loaded wrench to allow both mix spinning and tightening to occur in one direction. When mixing and tightening in the same direction, a stop mechanism does not have to be used.
  • Although the invention has been described in detail in the foregoing embodiments for the purpose of illustration, it is to be understood that such detail is solely for that purpose and that variations can be made therein by those skilled in the art without departing from the spirit and scope of the invention except as it may be described by the following claims.

Claims (16)

1. A mine roof bolt for use in a bore hole of a mine with resin comprising:
a strand cable; and
a head mechanism attached to the strand cable which allows the strand cable to be turned in a first direction for mixing the resin and in a second direction opposite the first direction for tensioning the strand cable in the mine roof.
2. A bolt as described in claim 1 wherein the head mechanism includes a hollow fixture threaded on the outside through which the cable extends and to which the cable is attached.
3. A bolt as described in claim 2 wherein the head mechanism includes a nut threaded to the fixture.
4. A bolt as described in claim 3 wherein the fixture has a bottom portion which is beveled internally.
5. A bolt as described in claim 4 wherein the head mechanism includes wedges which are disposed in the beveled portion to grip the cable.
6. A bolt as described in claim 5 wherein the fixture has an upper end which is swaged to the cable.
7. A bolt as described in claim 6 wherein the head mechanism includes a stop mechanism disposed between the end of the fixture and the wedges to prevent the nut from coming off as the fixture is spun backwards opposite of its threads to cause the cable to mix the resin.
8. A mine roof bolt for use with resin comprising:
a strand cable; and
means for allowing the strand cable to be turned in a first direction for mixing the resin and in a second direction opposite the first direction for tensioning the strand cable in the mine roof.
9. A method for placing a mine roof bolt in a mine roof comprising the steps of:
placing a resin cartridge in a bore hole in the mine roof;
inserting the strand cable of the bolt into the borehole so it pierces the cartridge;
rotating a head mechanism of the bolt attached to the strand cable in a first direction to rotate the strand cable and mix the resin; and
rotating the head mechanism in a second direction opposite the first direction to tension the cable bolt in the mine roof.
10. A method as described in claim 9 including the step of spinning the fixture of the head mechanism in a direction opposite of threads on the fixture.
11. A method as described in claim 10 wherein the spinning step includes the step of preventing a nut of the head mechanism from coming off with a stop mechanism of the head mechanism.
12. A method as described in claim 11 wherein the rotating in a second direction step includes the step of turning the nut in the second direction after the resin has set to tension the bolt.
13. A mine roof bolt for use in a bore hole of a mine with resin comprising:
a strand cable; and
a head mechanism attached to the strand cable, the head mechanism includes a hollow fixture made from hot rolled all thread bar threaded on the outside through which the cable extends and to which the cable is attached, and a nut threaded to the fixture.
14. A bolt as described in claim 13 wherein the fixture has a bottom portion which is beveled internally.
15. A bolt as described in claim 14 wherein the head mechanism includes wedges which are disposed in the beveled portion to grip the cable.
16. A method for placing a mine roof bolt in a mine roof comprising the steps of:
placing a resin cartridge in a bore hole in the mine roof;
inserting the strand cable of the bolt into the bore hole so it pierces the cartridge;
rotating a head mechanism of the bolt attached to the strand cable in a first direction to rotate the strand cable and mix the resin;
stopping the rotation of the head mechanism; and
rotating the head mechanism in the first direction to tension the cable bolt in the mine roof.
US11/452,494 2005-06-17 2006-06-14 Mine roof cable bolt and method Abandoned US20070009330A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US69166405P true 2005-06-17 2005-06-17
US11/452,494 US20070009330A1 (en) 2005-06-17 2006-06-14 Mine roof cable bolt and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/452,494 US20070009330A1 (en) 2005-06-17 2006-06-14 Mine roof cable bolt and method

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US20070009330A1 true US20070009330A1 (en) 2007-01-11

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008154683A1 (en) * 2007-06-21 2008-12-24 Industrial Roll Formers Pty Limited Rock bolt tendon tensioning
WO2012021588A3 (en) * 2010-08-10 2012-04-05 Fci Holdings Delaware, Inc. Fully grouted cable bolt
US20120163924A1 (en) * 2009-03-10 2012-06-28 Sandvik Intellectual Property Ab Friction bolt
US20130149042A1 (en) * 2011-12-07 2013-06-13 Johann Steyn Rock bolt

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077809A (en) * 1958-05-28 1963-02-19 British Ropes Ltd Roof bolt with a flexible tension member and cup-shaped expansible securing means
US4303354A (en) * 1979-03-28 1981-12-01 Peabody Coal Company Mine roof bolting
US5375946A (en) * 1992-02-06 1994-12-27 F. M. Locotos Equipment & Design Co. Mine roof support apparatus and method
US5511909A (en) * 1994-06-07 1996-04-30 Jennmar Corporation Cable bolt and method of use in supporting a rock formation
US5525013A (en) * 1994-10-31 1996-06-11 Seegmiller; Ben L. Cable bolt structure and related components
US5526720A (en) * 1994-06-14 1996-06-18 Locotos; Frank M. Wrench device for mine roof bolts
US5531545A (en) * 1995-05-11 1996-07-02 Seegmiller; Ben L. Cable bolt structure and method
US5586839A (en) * 1994-09-06 1996-12-24 Gillespie; Harvey D. Yieldable cable bolt
US5738466A (en) * 1993-08-16 1998-04-14 Bridon Plc Ribbed flexible member for casting into an anchorage medium
US6039509A (en) * 1991-09-25 2000-03-21 F. M. Locotos Equipment & Design Co. Mine roof support apparatus and method
US6402433B1 (en) * 2000-07-25 2002-06-11 H. Doug Gillespie Tensionable mine roof bolt
US6428243B1 (en) * 1996-09-09 2002-08-06 Quantax Pty Ltd Cable bolt
US6561721B2 (en) * 2000-03-15 2003-05-13 Mine Design Technologies Inc. Cable bolt with a yielding fixture and method of forming the same
US6612783B2 (en) * 2001-02-09 2003-09-02 Jennmar Corporation Cable bolt with mixing delay device

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077809A (en) * 1958-05-28 1963-02-19 British Ropes Ltd Roof bolt with a flexible tension member and cup-shaped expansible securing means
US4303354A (en) * 1979-03-28 1981-12-01 Peabody Coal Company Mine roof bolting
US6039509A (en) * 1991-09-25 2000-03-21 F. M. Locotos Equipment & Design Co. Mine roof support apparatus and method
US5647694A (en) * 1992-02-06 1997-07-15 F.M. Locotos Equipment & Design Co. Mine roof support apparatus and method
US5375946A (en) * 1992-02-06 1994-12-27 F. M. Locotos Equipment & Design Co. Mine roof support apparatus and method
US5738466A (en) * 1993-08-16 1998-04-14 Bridon Plc Ribbed flexible member for casting into an anchorage medium
US5511909A (en) * 1994-06-07 1996-04-30 Jennmar Corporation Cable bolt and method of use in supporting a rock formation
US5526720A (en) * 1994-06-14 1996-06-18 Locotos; Frank M. Wrench device for mine roof bolts
US5586839A (en) * 1994-09-06 1996-12-24 Gillespie; Harvey D. Yieldable cable bolt
US5525013A (en) * 1994-10-31 1996-06-11 Seegmiller; Ben L. Cable bolt structure and related components
US5531545A (en) * 1995-05-11 1996-07-02 Seegmiller; Ben L. Cable bolt structure and method
US6428243B1 (en) * 1996-09-09 2002-08-06 Quantax Pty Ltd Cable bolt
US6561721B2 (en) * 2000-03-15 2003-05-13 Mine Design Technologies Inc. Cable bolt with a yielding fixture and method of forming the same
US6402433B1 (en) * 2000-07-25 2002-06-11 H. Doug Gillespie Tensionable mine roof bolt
US6612783B2 (en) * 2001-02-09 2003-09-02 Jennmar Corporation Cable bolt with mixing delay device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008154683A1 (en) * 2007-06-21 2008-12-24 Industrial Roll Formers Pty Limited Rock bolt tendon tensioning
US20120163924A1 (en) * 2009-03-10 2012-06-28 Sandvik Intellectual Property Ab Friction bolt
US8714883B2 (en) * 2009-03-10 2014-05-06 Sandvik Intellectual Property Ab Friction bolt
WO2012021588A3 (en) * 2010-08-10 2012-04-05 Fci Holdings Delaware, Inc. Fully grouted cable bolt
CN103069109A (en) * 2010-08-10 2013-04-24 Fci特拉华控股有限公司 Fully grouted cable bolt
US8757934B2 (en) 2010-08-10 2014-06-24 Fci Holdings Delaware, Inc. Fully grouted cable bolt
US20130149042A1 (en) * 2011-12-07 2013-06-13 Johann Steyn Rock bolt
US8801336B2 (en) * 2011-12-07 2014-08-12 Rsc Mining (Pty) Ltd. Rock bolt

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Legal Events

Date Code Title Description
AS Assignment

Owner name: F.M. LOCOTOS CO., INC., PENNSYLVANIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LOCOTOS, FRANK M.;REEL/FRAME:018275/0957

Effective date: 20060728

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION