US20120148350A1 - Mine prop jack and method of prestressing a mine prop - Google Patents

Mine prop jack and method of prestressing a mine prop Download PDF

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Publication number
US20120148350A1
US20120148350A1 US12/928,402 US92840210A US2012148350A1 US 20120148350 A1 US20120148350 A1 US 20120148350A1 US 92840210 A US92840210 A US 92840210A US 2012148350 A1 US2012148350 A1 US 2012148350A1
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US
United States
Prior art keywords
prop
jack
mine
mine prop
post
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
US12/928,402
Inventor
Kenneth Poulson
Maury Gleave
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CANYON FUEL COMPANY Ltd
Original Assignee
CANYON FUEL COMPANY Ltd
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
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Application filed by CANYON FUEL COMPANY Ltd filed Critical CANYON FUEL COMPANY Ltd
Priority to US12/928,402 priority Critical patent/US20120148350A1/en
Assigned to CANYON FUEL COMPANY, LTD. reassignment CANYON FUEL COMPANY, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GLEAVE, MAURY, POULSON, KENNETH
Publication of US20120148350A1 publication Critical patent/US20120148350A1/en
Abandoned legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14Telescopic props
    • E21D15/16Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
    • E21D15/20Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with pawl, pin, cross-piece, or the like engaging with ratchet teeth, notches, holes, or the like, spaced apart at intervals
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/58Devices for setting props or chocks
    • E21D15/585Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important
    • E21D15/586Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important the props being pre-loaded

Abstract

A telescoping mine prop is prestressed by engaging the prop with a jack and thereby telescopically expanding the prop against opposing surfaces of the mine with the jack. Thereafter the prop is locked in position and the jack is disengaged from the prop for use with the expansion of another prop, thereby leaving the mine prop in a prestressed condition.

Description

    BACKGROUND OF THE INVENTION
  • The present invention relates generally to mine roof control, and more specifically, is directed to prestressing a standing support referred to as a mine prop. Such roof supports are useful in areas where mine roof bolting machines are not practical or the roof pressure is too great for conventional roof bolts.
  • As mining conditions continue to deteriorate due to depletion of easily accessible reserves, greater rock loads from increasing overburden are becoming the norm in mining. In order to protect miners from roof falls the root support or mine prop is prestressed so that the immediate strata does not have the opportunity to begin convergence. Controlling the initial convergence of the strata is critical in roof conditions that have a high degree of creep. Currently there are two methods of prestressing a standing support. One is accomplished with inflatable metal bladders that require a water reservoir and a pump. The second method involves pumping mortar into a bag on top of the support. The negative points with inflatable metal bladders are that a large reservoir of water must be transported to the work site and the maximum extension possible with a metal bladder is four inches. Another problem incurred with the mortar bag is that the mortar has a setting time of several hours.
  • It is therefore an object of the present invention is to provide a jack mechanism for a mine prop which allows the miner flexibility in the installation process and which is light enough to be carried by one person and also provides immediate prestressing of the mine prop.
  • SUMMARY OF THE INVENTION
  • The mine prop jack of the present invention is provided for prestressing a telescopically expandable mine prop which has a head plate and a foot plate secured to opposite ends and also includes a lock for adjustably locking the mine prop in an expanded condition. The present invention provides an expandable jack post which is deposed between the head and foot plate of the mine prop for expanding the prop against opposing surfaces (mine roof and floor) to a condition of prestress after engaging the mine prop lock and releasing the jack post. The jack post is temporarily tied to the mine prop to maintain the jack post in position during the operation. The jack post is then disengaged from the mine prop and moved to the next site where it is secured to another mine prop for conducting the prestressing operation over again.
  • Positive prestressing of the support is provided with the apparatus and method of the present invention. The jack mechanism can be carried by one person and attached and operated with no tools required and the requirement for water and cement is eliminated.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • Other objects and advantages appear hereinafter in the following description and claims. The accompanying drawings show, for the purpose of exemplification, without limiting the scope of the present invention or the appended claims, certain practical embodiments of the present invention wherein:
  • FIG. 1 is a schematic representation in front elevation of the jack of the present invention, with a mid portion thereof sectioned away to expose the interior, shown in combination with a telescoping mine prop to be prestressed;
  • FIG. 2 is a left side view of the combination shown in FIG. 1; and
  • FIG. 3 is a right side view of the combination shown in FIG. 1.
  • DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
  • Referring to the drawings, the telescopically expandable mine prop 10 includes a lower pipe section 11 which telescopically or slidably receives therein upper pipe section 12. Head plate 13 and foot plate 14 are welded to opposite ends of the prop 10 and the prop 10 is thus expandable such that head plate 13 and foot plate 14 respectively engage the mine roof 15 and mine floor 16. A vertical series of apertures 17 are provided in the mine prop 10 in order to receive a lock pin therein to permit preliminary adjustable locking of the mine prop 10 prior to full expansion for prestressing and subsequent locking of the prop 10 after full expansion for prestressing.
  • Jack post 20 of the present invention includes upper and lower clamps 21 and 22 respectively which consist of spaced ears 23 that engage opposite sides of prop 10 and are retained in position temporarily by the placement of bolts 24 through aligned apertures provided in the spaced ears 23. This retains jack post 10 in position with the upper and lower ends 25 and 26 respectively engaged against the inside surfaces of head and foot plate 13 and 14.
  • Upper pipe extension 27 is telescopically received over lower pipe extension 28 and upper pipe extension 27 may be raised or lowered relative to lower pipe extension 28 so that the jack 20 may be initially extended or expanded until the upper end 25 thereof engages the underside of head plate 13.
  • The small mid portion of jack 20 is broken away in FIG. 1 to expose an interior of lower pipe sleeve 28 and the upper end 29 of the jack piston for hydraulic jack 30. The lower end 31 of jack 30 rests against base plate 32 that is welded to the upper end of pipe base 33.
  • Hydraulic jack 30 is a conventional hand operated hydraulic jack that may be readily purchased in the market and is hand operated by pumping jack lever 34.
  • A vertical series of apertures 35 are provided in the upper pipe extension 27 so that the jack post 20 may be initially positioned and expanded between head and foot plates 13 and 14 and there temporarily held in position by inserting a lock pin in the appropriate aperture 35 for initial pre-positioning of the jack post 20.
  • Once jack post 20 is attached as described to prop 10 and initially expanded for initial engagement between head and foot plates 13 and 14, then hydraulic jack 30 is operated by pumping handle 34 to expand jack post 20 into engagement with upper end 25 and lower end 26 thereof against the inside of head plate 13 and foot plate 14 in order to provide a maximum expansion under load of the mine prop 10.
  • When this has been attained, prop 10 is locked in position by inserting locking pins in one or more apertures 17, and jack post 20 is disengaged from prop 10 thereby leaving mine prop 10 in a prestressed condition. Jack post 20 is disengaged by relieving the hydraulic pressure within jack 30 and thereafter removing pins 24 to remove the entire jack post 20 from prop 10 so that the operator may then carry the jack post 20 to the next location for prestressing the next mine prop 10.

Claims (9)

1. A mine prop prestressing device comprising;
a jack having means for temporarily attaching it to a telescoping mine prop for expanding said prop into prestressed engagement with opposing surfaces.
2. The mine prop of claim 1, wherein said jack consists of a jack post which is expandable against opposing head and foot plates secured to opposite ends of said mine prop for expanding said mine prop with said jack post.
3. The mine prop of claim 2, wherein said jack post is a telescopically expandable post having a hand operated hydraulic jack disposed therein.
4. The mine prop of claim 2, said means for temporarily attaching including upper and lower clamps for temporarily clamping said jack post to said mine prop.
5. A combination mine prop and jack for prestressing the mine prop, comprising:
a telescopically expandable mine prop having a head plate and a foot plate secured to opposite ends;
a lock for adjustably locking said prop in an expanded condition;
an expandable jack post disposed between said head and foot plates for expanding said prop against opposing surfaces to a condition of prestress after engaging said lock and releasing said jack post; and
tie means temporarily tying said jack post to said mine prop.
6. The combination of claim 5, wherein said jack post includes a hand operated hydraulic jack.
7. The combination of claim 5, said lock consisting of a longitudinal series of apertures in one portion of said telescopically expandable mine prop which is telescopically movable relative to a second part thereof, and a pin receivable in one of said apertures and engageable with said second part to lock said prop in an expanded prestressed condition.
8. The combination of claim 5, said tie means including upper and lower clamps for temporarily clamping said jack post to said mine prop.
9. The method of prestressing a telescoping mine prop comprising;
engaging said prop with a jack;
telescopically expanding said prop against opposing surfaces with said jack;
locking said prop at its expanded position; and
disengaging said jack from said prop for use with the expansion of another prop and thereby leaving said mine prop in a prestressed condition.
US12/928,402 2010-12-10 2010-12-10 Mine prop jack and method of prestressing a mine prop Abandoned US20120148350A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/928,402 US20120148350A1 (en) 2010-12-10 2010-12-10 Mine prop jack and method of prestressing a mine prop

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/928,402 US20120148350A1 (en) 2010-12-10 2010-12-10 Mine prop jack and method of prestressing a mine prop
AU2011200454A AU2011200454A1 (en) 2010-12-10 2011-02-03 Mine prop jack and method of prestressing a mine prop

Publications (1)

Publication Number Publication Date
US20120148350A1 true US20120148350A1 (en) 2012-06-14

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Family Applications (1)

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US12/928,402 Abandoned US20120148350A1 (en) 2010-12-10 2010-12-10 Mine prop jack and method of prestressing a mine prop

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US (1) US20120148350A1 (en)
AU (1) AU2011200454A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102748044A (en) * 2012-06-19 2012-10-24 徐州中安机械制造有限公司 Method for assembling single hydraulic prop
CN104912580A (en) * 2015-05-15 2015-09-16 四川华蓥山广能集团嘉华机械有限责任公司 Two-stage hydraulic telescopic and one-stage mechanical telescopic hydraulic support frame upright post
WO2018082148A1 (en) * 2016-11-03 2018-05-11 中国矿业大学 Device and method for pre-loading mechanical single prop with constant resistance
US10240458B2 (en) * 2014-04-28 2019-03-26 Cougar Can Company Pty Ltd Telescopic pumpable prop assembly with improved ceiling impact properties

Citations (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2529292A (en) * 1948-05-21 1950-11-07 Albert B Greenfield Elevating and supporting apparatus
US2621631A (en) * 1948-01-12 1952-12-16 Dowty Equipment Ltd Telescopic hydraulic mine roof support
US3860098A (en) * 1969-08-01 1975-01-14 Porter Co P L Hydraulic locking device
US3870268A (en) * 1973-04-30 1975-03-11 Sam Larkin Shoring apparatus
US4640650A (en) * 1983-06-09 1987-02-03 Bochumer Eisenhutte Heintzmann Gmbh & Co. Kg Hydraulically operated unit for roof support
USRE32675E (en) * 1981-04-09 1988-05-24 Mine stopping and method of and jack for installing same
US5026218A (en) * 1989-11-16 1991-06-25 Joy Technologies Inc. Temporary roof support cylinder
US5051039A (en) * 1988-07-04 1991-09-24 Heiliger Martha Catharina Hydraulic steel mine prop
US5205676A (en) * 1990-05-11 1993-04-27 Heiliger Robert W Hydraulic steel mine prop
US5228810A (en) * 1991-03-22 1993-07-20 Seegmiller Ben L Mine support post
US5240354A (en) * 1989-05-16 1993-08-31 Ingenieurtechnik Gmbh & Co. Kg Flexible telescopic prop for building materials
US5484130A (en) * 1993-11-13 1996-01-16 Bochumer Eisenhutte Heintzmann Gmbh & Co. Kg Support column for use in a mine
US6450733B1 (en) * 1996-11-20 2002-09-17 Hans-Joachim Krill Mobile anti-flood protection device
US6684577B2 (en) * 2000-11-22 2004-02-03 Mark Dimitrijevic Support system for lifting and leveling existing buildings that utilizes non-cylindrical support sections and a vertically-adjustable cap that enables the building to be easily raised or lowered to a desired height
US20040081518A1 (en) * 2002-02-22 2004-04-29 Jennmar Corporation Yieldable prop
US20040223815A1 (en) * 2002-02-22 2004-11-11 Jennmar Corpotation Yieldable prop having a yield section
US20040258487A1 (en) * 2003-06-23 2004-12-23 Dbt Gmbh Hydraulic shield support
US20050141971A1 (en) * 2002-02-22 2005-06-30 Jennmar Corporation Yieldable prop
US20060113452A1 (en) * 2004-11-29 2006-06-01 Actuant Corporation Extendible leg
US20060133899A1 (en) * 2004-12-16 2006-06-22 Seegmiller Ben L Yieldable prop for roof and ground control
US20080240868A1 (en) * 2007-04-02 2008-10-02 Wallace Bolton Mine support having a linearly moveable and/or pivoting end plate
US7490813B1 (en) * 2008-02-19 2009-02-17 Weddle David R Rescue tool
US20090152431A1 (en) * 2005-08-10 2009-06-18 Jonathan Jonny Melic Locking and lifting mechanism for safety fence support post
US8001733B2 (en) * 2009-12-04 2011-08-23 Min Chen Adjustable jack post
US8066246B2 (en) * 2009-06-05 2011-11-29 William Bishop Telescopic support with internal brake

Patent Citations (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2621631A (en) * 1948-01-12 1952-12-16 Dowty Equipment Ltd Telescopic hydraulic mine roof support
US2529292A (en) * 1948-05-21 1950-11-07 Albert B Greenfield Elevating and supporting apparatus
US3860098A (en) * 1969-08-01 1975-01-14 Porter Co P L Hydraulic locking device
US3870268A (en) * 1973-04-30 1975-03-11 Sam Larkin Shoring apparatus
USRE32675E (en) * 1981-04-09 1988-05-24 Mine stopping and method of and jack for installing same
US4640650A (en) * 1983-06-09 1987-02-03 Bochumer Eisenhutte Heintzmann Gmbh & Co. Kg Hydraulically operated unit for roof support
US5051039A (en) * 1988-07-04 1991-09-24 Heiliger Martha Catharina Hydraulic steel mine prop
US5240354A (en) * 1989-05-16 1993-08-31 Ingenieurtechnik Gmbh & Co. Kg Flexible telescopic prop for building materials
US5026218A (en) * 1989-11-16 1991-06-25 Joy Technologies Inc. Temporary roof support cylinder
US5205676A (en) * 1990-05-11 1993-04-27 Heiliger Robert W Hydraulic steel mine prop
US5228810A (en) * 1991-03-22 1993-07-20 Seegmiller Ben L Mine support post
US5484130A (en) * 1993-11-13 1996-01-16 Bochumer Eisenhutte Heintzmann Gmbh & Co. Kg Support column for use in a mine
US6450733B1 (en) * 1996-11-20 2002-09-17 Hans-Joachim Krill Mobile anti-flood protection device
US6684577B2 (en) * 2000-11-22 2004-02-03 Mark Dimitrijevic Support system for lifting and leveling existing buildings that utilizes non-cylindrical support sections and a vertically-adjustable cap that enables the building to be easily raised or lowered to a desired height
US20070031197A1 (en) * 2002-02-22 2007-02-08 Jennmar Corporation Yieldable prop having a yield section
US20040223815A1 (en) * 2002-02-22 2004-11-11 Jennmar Corpotation Yieldable prop having a yield section
US7334968B2 (en) * 2002-02-22 2008-02-26 Jennmar Corporation Yieldable prop
US20050141971A1 (en) * 2002-02-22 2005-06-30 Jennmar Corporation Yieldable prop
US20070059109A1 (en) * 2002-02-22 2007-03-15 Jennmar Corporation Yieldable Prop Having A Yield Section
US20040081518A1 (en) * 2002-02-22 2004-04-29 Jennmar Corporation Yieldable prop
US20040258487A1 (en) * 2003-06-23 2004-12-23 Dbt Gmbh Hydraulic shield support
US20060113452A1 (en) * 2004-11-29 2006-06-01 Actuant Corporation Extendible leg
US20060133899A1 (en) * 2004-12-16 2006-06-22 Seegmiller Ben L Yieldable prop for roof and ground control
US20090152431A1 (en) * 2005-08-10 2009-06-18 Jonathan Jonny Melic Locking and lifting mechanism for safety fence support post
US20080240868A1 (en) * 2007-04-02 2008-10-02 Wallace Bolton Mine support having a linearly moveable and/or pivoting end plate
US7490813B1 (en) * 2008-02-19 2009-02-17 Weddle David R Rescue tool
US8066246B2 (en) * 2009-06-05 2011-11-29 William Bishop Telescopic support with internal brake
US8001733B2 (en) * 2009-12-04 2011-08-23 Min Chen Adjustable jack post

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102748044A (en) * 2012-06-19 2012-10-24 徐州中安机械制造有限公司 Method for assembling single hydraulic prop
US10240458B2 (en) * 2014-04-28 2019-03-26 Cougar Can Company Pty Ltd Telescopic pumpable prop assembly with improved ceiling impact properties
CN104912580A (en) * 2015-05-15 2015-09-16 四川华蓥山广能集团嘉华机械有限责任公司 Two-stage hydraulic telescopic and one-stage mechanical telescopic hydraulic support frame upright post
WO2018082148A1 (en) * 2016-11-03 2018-05-11 中国矿业大学 Device and method for pre-loading mechanical single prop with constant resistance
RU2685358C1 (en) * 2016-11-03 2019-04-17 Китайский Университет Горного Дела И Технологии Device and method for preloading mechanical single support with constant resistance
US10385692B2 (en) 2016-11-03 2019-08-20 China University Of Mining And Technology Apparatus and method for pre-loading mechanical constant-resistance single prop
AU2016428717B2 (en) * 2016-11-03 2020-05-14 China University Of Mining And Technology Apparatus and method for pre-loading mechanical constant-resistance single prop

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CANYON FUEL COMPANY, LTD., UTAH

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:POULSON, KENNETH;GLEAVE, MAURY;REEL/FRAME:025718/0563

Effective date: 20100820

STCB Information on status: application discontinuation

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