US2801522A - Mine arch supports - Google Patents

Mine arch supports Download PDF

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Publication number
US2801522A
US2801522A US338799A US33879953A US2801522A US 2801522 A US2801522 A US 2801522A US 338799 A US338799 A US 338799A US 33879953 A US33879953 A US 33879953A US 2801522 A US2801522 A US 2801522A
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United States
Prior art keywords
roof
bar
sections
roof bar
draw means
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Expired - Lifetime
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US338799A
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Kuhn Otto
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DEUTSCHE KOHLENBERGBAN-LEITUNG
KOHLENBERGBAN LEITUNG DEUTSCHE
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KOHLENBERGBAN LEITUNG DEUTSCHE
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
    • E21D23/06—Special mine caps or special tops of pit-props for permitting step-by-step movement

Definitions

  • roof supporting structures which comprise two props which are of adjustable length and a reef bar connecting these props, the latter being arranged on a common sole piece or being interconnected by a cross bar above the sole.
  • the roof bars used in these constructions have the disadvantage that where the roof is uneven theyare only applied against the roof over a small part of their length, for instance at the ends only, and consequently 'are subjected to objectionable bending strains.
  • This drawback vis also encountered in a roofsuppor for use at the coal face, in which pivotally interconnected short .roof .bars are each supported by a pit prop somewhere about midway along its length.
  • the invention is aimed at ⁇ overcoming this drawback, to which end it resides in a combination of the following features:
  • the roof bar is composed of a plurality of sections (preferably two) which are hingedly interconnected at joints which permit a relative angular adjustment of the jointed sections at least in the vertical plane.
  • Each section of the roof bar is pivotally connected to a pit prop which serves to support the same.
  • the props are equipped with supporting members (for example head plates or laggings) which are located between the roof and the roof bar sections, these members also preferably being used to press the draw means against the roof.
  • the draw means itself consists of a steel strip, but other means can be employed, for example a wire cable.
  • Tightening devices for example in the form of wedges or screws, can be associated with the draw means.
  • the ends of such draw means can be detachably secured to the ends of the roof bar, e. g. by means of pushed-on sleeves or the like, which enables roof bars which, in principle, are of known form, to be readily modified in accordance with the proposal of this invention.
  • the invention is suited, with particular advantage, to the production of an arch support for a mechanical face Working.
  • a structural element of this character will then advantageously comprise two hingedly interconnected roof bar sections or parts each of which is supported by a prop, these props being connected together by a cross piece or the like located close to the oor of the working. It is, however, to be understood that mine arches in accordance with this invention are also capable of use with advantage otherwise than in a mechanical face working.
  • An embodiment of the arch support according to this invention is illustrated in the accompanying drawmg.
  • Figure 1 is an elevational view of the arch structure mounted in a coal seam which has an even roof;
  • Figures 2 and 3 illustrate the same structure used in connection with roofs which are, respectively, of concave and ⁇ convex formation
  • Figures 4 and 5 are respectively a side elevation and a plan View, on a larger scalethan that of Figures 1 to 3, of the connection between the prop, roof bar and draw means of the structure of Figures 1 to 3.
  • the arch support consists ⁇ of pit props 1 and 2 which are interconnected by a cross bar 14 near the floor and serve to support the roof bar Vwhich is made up of two sections 3 and 4 respectively pivoted Vto the props 1 and 2 at 5 and 6.
  • the sections 3 and 4 are interconnected at ⁇ their adjacent ends by a hinged joint '7.
  • Head plates 8 and 9 are pivotally connectedat the top of the props 1 and 2 respectively.
  • the outer ⁇ ends of the roof bar sections 3 and 4 are connected by a steel strip 10 which is passed over the upper sides of the head :plates "8 and 9.
  • Upstanding projections 13 may ⁇ be1provided at the outer ends of the sections 3 and 4 for connection of the strip ends, or these ends may be detachably secured to therespective ends of the sections, for example by sleeves 13a which releasably engage the ends of the roof bar sections as shown in Figures 4 and 5.
  • the strip 10 terminates in a loop 10a which embraces one limb of a shackle 15 the other limb of which is formed with an extension 16 which passes through a central boss in a cross-head form sleeve 13a, the limbs of which are adapted releasably to engage the end of the roof bar section 4; the latter, as clearly shown in Figure 5, comprises a pair of parallel beams disposed one on each side of the prop 2.
  • the extension 16 is slotted to accommodate a wedge 17 which may be driven into the slot to effect tensioning of the strip 10.
  • Springs 11 and 12 are disposed between the strip 10 and the upper face of the two roof bar sections. It will be understood that more springs than are actually here illustrated can be employed, this multiplicity of springs being distributed over the length of the roof bar.
  • the springs 11 and 12, where only these two are employed, are arranged in the vicinity of the joint 7. As can be seen from Figure 2, the springs prevent the hinged connecting joint 7 between the roof bar sections from being pressed upwards to an excessive extent.
  • the sections 3 and 4 are of a material having a small modulus of elasticity but a high elastic limit, for example of an improved aluminium alloy of the Al-Cu-Mg type.
  • a mine roof support comprising: a roof bar composed of a plurality of sections hingedly jointed end-toend for relative angular adjustment in a vertical plane, a pit prop for pivotally supporting each of said roof bar sections, a draw means interconnecting the outer ends of the composite roof bar and disposed at the roof side of the bar, compression springs disposed between said roof bar and draw means at least in the region of the hinged connection between the adjacent roof bar sections, and a supporting member pivotally mounted at the upper end of each prop between the roof bar sections and the draw means and serving to press the draw means against the roof.
  • a mine roof support comprising: a roof bar composed of a plurality of sections hingedly jointedend-toend for relative angular adjustment in a vertical plane, a pit propifor pivotally supporting each of said roof bar sections, a draw means interconnecting the outer ends of the composite roof bar and disposed at the roof side of said bar, compression springs disposed between said roof bar and draw means in the region of the hinged connection between the adjacent roof bar sections, a supporting member on the end of each pit prop and in Contact with the draw means, and tightening means for said draw means.
  • each section is pivotally mounted on the upper end of its pit prop approximately at theI mid-point of theV section.
  • a mine roof support according to claim l in which the pair of sections include two pairs arranged parallel to each other one on each side of the pit prop.
  • a mine roof support comprising: a roof bar cornposed of a plurality of sections hingedly jointed end-toend for relative angular adjustment in a vertical plane, a pit prop for pivotally supporting each of said roof bar sections, a draw means interconnecting the outer ends of the composite roof bar and disposed at the roof side of the bar, compression springs disposed between said roof bar and draw means at least in the region of the hinged connection between the adjacent roof bar sections, a supporting member pivotally mounted at the upper end of each prop between the roof bar sections and the draw CII means and serving to press the draw means against the roof, and a cross bar connected to the pit props near the bottom ends thereof to form a closed frame relative to the roof bar and the pit props.
  • a mine roof support comprising: a roof bar composed of a plurality of sections hingedly jointed end-toend for relative angular adjustment in a vertical plane, a pit prop for pivotally supporting each of said roof bar sections, a draw means interconnecting the outer ends of the composite roof bar and disposed at the roof side of said bar, compression springs disposed between said roof bar and draw means in the region of the hinged connection between the adjacent roof bar sections, ⁇ a supporting member on the end of each pit prop and in Contact with the draw means, tightening means for said draw means, and a cross bar connected to the pit props near the bottom ends thereof to form a closed frame relative to the roof bar and the pit props as an approximate rectangular configuration.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Tents Or Canopies (AREA)

Description

Aug. 6, 1957 Q KUHN 2,801,522
MINE ARCH SUPPORTS Filed Feb. 25, 1953 2 Sheets-Sheet 1 Aug. 6, 1957 Q KUHN 2,801,522
MINE ARCH SUPPORTS Filed Feb. 25, 195s 2 sheets-sheet 2 W a 21W United States Patent 2,801,522 MINE ARCH SUPPORTS Otto Kuhn, Essen-Bredeney, Germany, assigner to Deutsche Khlenbergbau-Leitung, Essen, Germany Application `l'iebruary 25, 1953, Serial N o. 338,799
Claims priority, application Germany February 28, 1952 `7 claims, (c1. s1-45) In carrying out the mechanisation of face roadways in mines, roof supporting structures have been proposed which comprise two props which are of adjustable length and a reef bar connecting these props, the latter being arranged on a common sole piece or being interconnected by a cross bar above the sole. The roof bars used in these constructions have the disadvantage that where the roof is uneven theyare only applied against the roof over a small part of their length, for instance at the ends only, and consequently 'are subjected to objectionable bending strains. This drawback vis also encountered in a roofsuppor for use at the coal face, in which pivotally interconnected short .roof .bars are each supported by a pit prop somewhere about midway along its length.
The invention is aimed at `overcoming this drawback, to which end it resides in a combination of the following features:
(a) The roof bar is composed of a plurality of sections (preferably two) which are hingedly interconnected at joints which permit a relative angular adjustment of the jointed sections at least in the vertical plane.
(b) Each section of the roof bar is pivotally connected to a pit prop which serves to support the same.
(c) The outer ends of the roof bar made up of the inter-coupled roof bar sections are connected by a draw means which is located at the roof side of the bar and which is supported against the bar sections by resilient means (particularly by springs).
Advantageously the props are equipped with supporting members (for example head plates or laggings) which are located between the roof and the roof bar sections, these members also preferably being used to press the draw means against the roof. In a preferred case, the draw means itself consists of a steel strip, but other means can be employed, for example a wire cable.
The individual features of the combination of this invention are per se known, but the object of the invention is only met by a combination of all these features, such combination producing a simple high 1oadcapacity roof bar of small thickness which supports the roof over a comparatively extended length even where this is most uneven, whilst at the same time undesirable bending strains are avoided.
Tightening devices, for example in the form of wedges or screws, can be associated with the draw means. Moreover, the ends of such draw means can be detachably secured to the ends of the roof bar, e. g. by means of pushed-on sleeves or the like, which enables roof bars which, in principle, are of known form, to be readily modified in accordance with the proposal of this invention.
The invention is suited, with particular advantage, to the production of an arch support for a mechanical face Working. A structural element of this character will then advantageously comprise two hingedly interconnected roof bar sections or parts each of which is supported by a prop, these props being connected together by a cross piece or the like located close to the oor of the working. It is, however, to be understood that mine arches in accordance with this invention are also capable of use with advantage otherwise than in a mechanical face working. An embodiment of the arch support according to this invention is illustrated in the accompanying drawmg.
Figure 1 is an elevational view of the arch structure mounted in a coal seam which has an even roof;
Figures 2 and 3 illustrate the same structure used in connection with roofs which are, respectively, of concave and `convex formation; and
Figures 4 and 5 are respectively a side elevation and a plan View, on a larger scalethan that of Figures 1 to 3, of the connection between the prop, roof bar and draw means of the structure of Figures 1 to 3.
In the embodiment illustrated, the arch support consists `of pit props 1 and 2 which are interconnected by a cross bar 14 near the floor and serve to support the roof bar Vwhich is made up of two sections 3 and 4 respectively pivoted Vto the props 1 and 2 at 5 and 6. The sections 3 and 4 are interconnected at `their adjacent ends by a hinged joint '7. Head plates 8 and 9 are pivotally connectedat the top of the props 1 and 2 respectively. The outer `ends of the roof bar sections 3 and 4 are connected by a steel strip 10 which is passed over the upper sides of the head :plates "8 and 9. Upstanding projections 13 may `be1provided at the outer ends of the sections 3 and 4 for connection of the strip ends, or these ends may be detachably secured to therespective ends of the sections, for example by sleeves 13a which releasably engage the ends of the roof bar sections as shown in Figures 4 and 5.
Thus as shown in Figures 4 and 5, the strip 10 terminates in a loop 10a which embraces one limb of a shackle 15 the other limb of which is formed with an extension 16 which passes through a central boss in a cross-head form sleeve 13a, the limbs of which are adapted releasably to engage the end of the roof bar section 4; the latter, as clearly shown in Figure 5, comprises a pair of parallel beams disposed one on each side of the prop 2. The extension 16 is slotted to accommodate a wedge 17 which may be driven into the slot to effect tensioning of the strip 10.
Springs 11 and 12 are disposed between the strip 10 and the upper face of the two roof bar sections. It will be understood that more springs than are actually here illustrated can be employed, this multiplicity of springs being distributed over the length of the roof bar. Advantageously the springs 11 and 12, where only these two are employed, are arranged in the vicinity of the joint 7. As can be seen from Figure 2, the springs prevent the hinged connecting joint 7 between the roof bar sections from being pressed upwards to an excessive extent.
To enhance the elasticity of the roof bar, and thus its capacity to conform to the roof, it is of advantage to make the sections 3 and 4 of a material having a small modulus of elasticity but a high elastic limit, for example of an improved aluminium alloy of the Al-Cu-Mg type.
I claim:
l. A mine roof support, comprising: a roof bar composed of a plurality of sections hingedly jointed end-toend for relative angular adjustment in a vertical plane, a pit prop for pivotally supporting each of said roof bar sections, a draw means interconnecting the outer ends of the composite roof bar and disposed at the roof side of the bar, compression springs disposed between said roof bar and draw means at least in the region of the hinged connection between the adjacent roof bar sections, and a supporting member pivotally mounted at the upper end of each prop between the roof bar sections and the draw means and serving to press the draw means against the roof.
2. A mine roof support according to claim 1, in which the draw means is a steel strip.
3. A mine roof support, comprising: a roof bar composed of a plurality of sections hingedly jointedend-toend for relative angular adjustment in a vertical plane, a pit propifor pivotally supporting each of said roof bar sections, a draw means interconnecting the outer ends of the composite roof bar and disposed at the roof side of said bar, compression springs disposed between said roof bar and draw means in the region of the hinged connection between the adjacent roof bar sections, a supporting member on the end of each pit prop and in Contact with the draw means, and tightening means for said draw means.
4. A mine roof support according to claim 1, in which each section is pivotally mounted on the upper end of its pit prop approximately at theI mid-point of theV section.
5. A mine roof support according to claim l, in which the pair of sections include two pairs arranged parallel to each other one on each side of the pit prop.
6. A mine roof support, comprising: a roof bar cornposed of a plurality of sections hingedly jointed end-toend for relative angular adjustment in a vertical plane, a pit prop for pivotally supporting each of said roof bar sections, a draw means interconnecting the outer ends of the composite roof bar and disposed at the roof side of the bar, compression springs disposed between said roof bar and draw means at least in the region of the hinged connection between the adjacent roof bar sections, a supporting member pivotally mounted at the upper end of each prop between the roof bar sections and the draw CII means and serving to press the draw means against the roof, and a cross bar connected to the pit props near the bottom ends thereof to form a closed frame relative to the roof bar and the pit props.
7. A mine roof support, comprising: a roof bar composed of a plurality of sections hingedly jointed end-toend for relative angular adjustment in a vertical plane, a pit prop for pivotally supporting each of said roof bar sections, a draw means interconnecting the outer ends of the composite roof bar and disposed at the roof side of said bar, compression springs disposed between said roof bar and draw means in the region of the hinged connection between the adjacent roof bar sections, `a supporting member on the end of each pit prop and in Contact with the draw means, tightening means for said draw means, and a cross bar connected to the pit props near the bottom ends thereof to form a closed frame relative to the roof bar and the pit props as an approximate rectangular configuration.
References Cited in the file of this patent UNITED STATES PATENTS 2,650,475 Gerlach Sept. 1, 1953 2,714,505 Joy Aug. 2, 1955 FOREIGN PATENTS 891,261 France of 1943 961,322 France of 1949 805,635 Germany May 25, 1951
US338799A 1952-02-28 1953-02-25 Mine arch supports Expired - Lifetime US2801522A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3107902A (en) * 1958-12-29 1963-10-22 Joy Mfg Co Method of supporting mine roofs and supporting means therefor
US3115754A (en) * 1959-01-23 1963-12-31 Dowty Mining Equipment Ltd Mining shield
US3143862A (en) * 1958-08-11 1964-08-11 Dobson Ltd W E & F Support of roofs in mines
US3163012A (en) * 1961-01-18 1964-12-29 Joseph B Dempscy Mine roof bolt installation
US3201943A (en) * 1960-12-24 1965-08-24 Rheinstahl Gmbh Wanheim Mine roof support
US3218811A (en) * 1961-04-28 1965-11-23 Rheinstahl Gmbh Wanheim Composite cap for mine roof supports
US3431737A (en) * 1967-02-14 1969-03-11 Wild A G & Co Ltd Hydraulic roof supports
US4175891A (en) * 1977-10-08 1979-11-27 Bochumer Eisenhutte Heintzmann Gmbh & Co. Auxiliary walking mine support
US20090095851A1 (en) * 2007-10-10 2009-04-16 Stolworthy Josephine G Vertical pole support system
US20100166504A1 (en) * 2008-12-30 2010-07-01 Steven Patton Concentrically Loaded, Adjustable Piering System
US8821073B2 (en) 2008-12-30 2014-09-02 Steve Patton Concentrically loaded, adjustable piering system
CN104141504A (en) * 2014-07-14 2014-11-12 霍忠明 Arch-cross-section roadway tunneling support device
US11332896B2 (en) 2019-02-19 2022-05-17 David Newcomb Centric pier system and method
US20230183936A1 (en) * 2021-12-10 2023-06-15 Steven Robertson Pier support system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR891261A (en) * 1942-01-26 1944-03-02 Gutehoffnungshuette Oberhausen Ag Support method for mine galleries
FR961322A (en) * 1950-05-10
DE805635C (en) * 1948-10-02 1951-05-25 Hermann Schwarz K G Cap for longwall mining
US2650475A (en) * 1948-07-30 1953-09-01 Gerlach Karl Mine supporting structure
US2714505A (en) * 1948-05-01 1955-08-02 Joy Mfg Co Apparatus for mine roof control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR961322A (en) * 1950-05-10
FR891261A (en) * 1942-01-26 1944-03-02 Gutehoffnungshuette Oberhausen Ag Support method for mine galleries
US2714505A (en) * 1948-05-01 1955-08-02 Joy Mfg Co Apparatus for mine roof control
US2650475A (en) * 1948-07-30 1953-09-01 Gerlach Karl Mine supporting structure
DE805635C (en) * 1948-10-02 1951-05-25 Hermann Schwarz K G Cap for longwall mining

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3143862A (en) * 1958-08-11 1964-08-11 Dobson Ltd W E & F Support of roofs in mines
US3107902A (en) * 1958-12-29 1963-10-22 Joy Mfg Co Method of supporting mine roofs and supporting means therefor
US3115754A (en) * 1959-01-23 1963-12-31 Dowty Mining Equipment Ltd Mining shield
US3201943A (en) * 1960-12-24 1965-08-24 Rheinstahl Gmbh Wanheim Mine roof support
US3163012A (en) * 1961-01-18 1964-12-29 Joseph B Dempscy Mine roof bolt installation
US3218811A (en) * 1961-04-28 1965-11-23 Rheinstahl Gmbh Wanheim Composite cap for mine roof supports
US3431737A (en) * 1967-02-14 1969-03-11 Wild A G & Co Ltd Hydraulic roof supports
US4175891A (en) * 1977-10-08 1979-11-27 Bochumer Eisenhutte Heintzmann Gmbh & Co. Auxiliary walking mine support
US20090095851A1 (en) * 2007-10-10 2009-04-16 Stolworthy Josephine G Vertical pole support system
US20100166504A1 (en) * 2008-12-30 2010-07-01 Steven Patton Concentrically Loaded, Adjustable Piering System
US8206063B2 (en) 2008-12-30 2012-06-26 Steven Patton Concentrically loaded, adjustable piering system
US8821073B2 (en) 2008-12-30 2014-09-02 Steve Patton Concentrically loaded, adjustable piering system
US8851800B2 (en) 2009-12-07 2014-10-07 Steven Patton Concentrically loaded, adjustable piering system
CN104141504A (en) * 2014-07-14 2014-11-12 霍忠明 Arch-cross-section roadway tunneling support device
US11332896B2 (en) 2019-02-19 2022-05-17 David Newcomb Centric pier system and method
US20230183936A1 (en) * 2021-12-10 2023-06-15 Steven Robertson Pier support system
US11926985B2 (en) * 2021-12-10 2024-03-12 Steven Robertson Pier support system

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