US3184206A - Support units especially for mine roof - Google Patents

Support units especially for mine roof Download PDF

Info

Publication number
US3184206A
US3184206A US265706A US26570663A US3184206A US 3184206 A US3184206 A US 3184206A US 265706 A US265706 A US 265706A US 26570663 A US26570663 A US 26570663A US 3184206 A US3184206 A US 3184206A
Authority
US
United States
Prior art keywords
chamber
support
aperture
props
prop
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.)
Expired - Lifetime
Application number
US265706A
Other languages
English (en)
Inventor
Meriaux Michel
Combier Michel Lablache
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.)
MINES DOMANIALES DE POTASSE
MINES DOMANIALES DE POTASSE D'ALSACE
Original Assignee
MINES DOMANIALES DE POTASSE
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
Application filed by MINES DOMANIALES DE POTASSE filed Critical MINES DOMANIALES DE POTASSE
Application granted granted Critical
Publication of US3184206A publication Critical patent/US3184206A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/50—Component parts or details of props
    • E21D15/54—Details of the ends of props
    • E21D15/545—Details of the ends of props hydraulic or pneumatic
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/48—Chocks or the like
    • E21D15/486—Chocks or the like with essential hydraulic or pneumatic details
    • 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
    • E21D23/0418—Positioning devices and stabilizing means for the props

Definitions

  • walking support members generally comprise a number of hydraulic pit props borne by a base frame of varying size and compactness, formed, for example, by a high rigid sheet-metal box, which gives the whole unit great stability and holds the pit props in place very efficiently. It has, however, been found necessary to leave a clearance between each prop and the top of the base frame and to insert a resilient element to protect the prop, eg., a spring or more simply a rubber shock absorber such as a ring or collar. This arrangement prevents the props from bearing against the frame and being damaged by considerable transverse forces, particularly in sloping strata. The devices also recenter the prop when it is released for the support to be moved forward.
  • the subject of the invention is a centering device, more particularly for the centering of support props, particularly walking supports, which obviates the aforementioned disadvantages and more particularly fullls the following two conditions: iirstly, centering of the props in their base frame when they are released, i.e., before the movement of the support, and secondly, sufficient clearance between the props and the top of the frame, so that the props are protected from abnormal bending forces if the roof subsides, more particularly in very sloping strata.
  • Such a centering device can be used of course-without going beyond the scope of the invention-for straightening or centering in relation to a transverse support member a horizontal, vertical or inclined element which may depart from its initial axial position during operation.
  • the resilient element disposed between a member, e.g., a prop of a support unit, and its transverse supporting element is formed by a sealing-tight deformable chamber comprising at least one aperture which can be connected to a duct for fluid of controllable pressure.
  • rlille duct can, for instance, be connected to a pump and thus be under pressure when the pump is working and be brought to the pump reservoir pressure when the pump is not operating.
  • the aperture in the sealing-tight chamber could be connected selectively to a duct for tiuid under Cice pressure, e.g., a duct communicating with a pressure accumulator, and to an outlet duct for the fluid.
  • the deformable chamber will preferably be substantially toroidal and be disposed between suitably shaped elements borne by the member and its transverse support element respectively.
  • the cross-section of the sealing-tight chamber is bean-shaped and comprises two parts of opposite concavity disposed inside one another. These two parts are respectively supported on parts of corresponding shape unitary with the member and its transverse support element, the supporting zone for the inner part being disposed in the free state near the centre of the outer part.
  • FIGURE l is an elevation of a walking support unit whose props are provided with the device according to the invention.
  • FIGURE la is a partial view similar to FIGURE l showing another embodiment of the invention.
  • FIGURE 2 is a section through an advantageous embodiment of the resilient element disposed between a prop and its transverse support element;
  • FIGURE 2a is a similar view to FIGURE 2 after the prop has been inclined
  • FIGURE 3 is a similar view to FIGURE 2 of another embodiment.
  • FIGURE 4 is a similar view to FIGURE 2 of another embodiment.
  • FIGURE l shows a walking support unit comprising in known manner a base box 1 whose bottom surface '1a supports a number of props 2 resting pivotally thereon.
  • such unit will generally comprise a number of props retained by appropriate transverse support elements disposed a certain height above the base of the unit; if the base element is a rigid box the props pass through the top surface 1b of such box through appropriate apertures 1c to this end.
  • each aperture 1c and on the outer surface of the corresponding propl two appropriately shaped parts 3 and 4 are attached with a resilient and sealing-tight chamber 5 .between them, which is supported laterally in recesses in each of the parts 3 and 4.
  • the chamber 5 is toroidal in shape and comprises an aperture 5a -to which a duct 6 is attached.
  • the duct is itself connected to a conduit 7 feeding all or some of the props forming the various units.
  • the conduit 7 can lbe put into communication with a hydraulic or pneumatic pressure iiuid source, e.g., a pump or a pressure accumulator. ⁇
  • the device operates as follows: the props 2 are iirst locked between the mine roof and the base 1d of the box resting ou the floor; when roof subsidences have caused the props to become inclined to the position shown in chain lines in FIGURE 1, the Iconduit 7 is connected t-o Ilthe hydraulic or pneumatic pressure source, eg., Vby starting the aforementioned pump. The props are then. lowered by reducing the hydraulic pressure inside their cylinder. The ination of the .chambers centers the props while in their lowered positions in relation to the base box. The unit or units are then moved in known manner, whereafter the props 2 .are raised, while the pressure in the chamber 5 is maintained.
  • the part 4 When the prop 2 is inclined in relation to t-he base box, .the part 4 will move towards or away from the annular plate 3d, i.e.,l the inner periphery 3a of the Iannular plate -3d'fwill :be moved in relation to the part 4 over a distance X in FIGURE 2.
  • the distance X corresponds on the' one band to the clearance necessary to absorb roof subsidences, .and -onthe other to .the deformation of the chamber 5 during which it may be considered that the force transmitted by said chamber to the part 4, i.e., the torce of the part 5b of the chamber on .the inner Iperiphery Y 3a of .the annular plate 3d remains substantially constant.
  • FIGURE 1 shows a single sealing-tight chamber formed by a torus, but clearly other embodiments could be envisaged Vwithout going outside the V.scope of the invention. For instance, similar chambersto lthat shown in FIGURE 1 could be superimposed on top of one another,
  • the invention means are lprovided to prevent the inner part 5b from becoming displaced beyondits initial position close to Ythe center ot the outer part 5a.
  • flexible but f inextensible elements are used whichconnect the inner part necessitate reinforcement of their structure, or a reduced Y,
  • a sealing-tight chamber whichgcan be inflated if lrequired or subjected to initial inside pressure, but which is of a shape such as to exert on the Vprop .to be recentered a force substantially independent of the axial olf-setting of the prop in relation to its transverse supporting element.
  • the crushing force curve' has been experimentally de-Y termined andlcalculated for a chamber inflated with air or Y water in relation to the movement of an element supported on the inner or outer periphery of such chamber.
  • the center of the part 5a can bey cut out.v
  • the chamber 5 is fixed in the element 4 in a lmanner similar to a tire without an inner t-ube,'and the two free ends of the Vpart 5a will preferably be reinforced'by metal rings 9 or the like.
  • This arrangement makes it very easy to tix metal bra-id in the element 4.
  • two series of braids y8 are provided and are inclined in relation to the equatorial plane of the chamber 5.
  • the crushing force is substantially equal to chamber 5 of the device described above is for the cross-V section of such ychamber to be bean-shaped'as shown in- FIGURE 2.
  • V Y l It can be seen ffrom the drawingthat'the'cross-sectiony Y of the chamber k5 comprises two parts 5a and'Sb 4of oppo-fl site concavity to one another, ⁇ and the part 5b is disposed inside the part.k 5a which 4is itself sernicircular.
  • v rtree state ie., when there is no pressure inside the chamber, :the part 5b extends almostto Vthe centerA of the part In the ⁇ 5a.
  • the part 4 -ixedr'on the ,shaft of the prop 2 has an Y outwardly open annular groovey which strictly'matches the' shape ott the par-t 5a fof the Ychamber 5.1 i
  • the braids or diaphragm-s 8 can be xed directly on the Y braces 9 of the part'Sa whichV are themselves substantially fixedin relation to thepiece 4.
  • the positions of the inner and outer parts of the bean-shapecould beinverted without going outside the scope of the invention.
  • a support unit comprising ya support element, a support structure defining an aperture which receives the support element, the support element being movable within the aperture relative to the support structure, a sealingtight resilient deformable chamber located between the rim of said aperture and said support element and means for coupling the interior of said chamber with a source of uid pressure to recenter said support element relative to said aperture after displacement of said element from a co-axial position relative to said aperture.
  • a support unit comprising a support element, a support structure deining an aperture which receives said support element, a seal-tight lresilient deformable chamber which in cross-section includes opposite concave walls facing in like direction, one of said walls lying within the limits of the other, and a pair of support members respectively carried by said element and said structure and of shape corresponding to the exterior of said walls, in the rest state said walls engaging said members, said element being co-axial with said aperture and the innermost part of said inner wall being adjacent the center of said outer Wall, means being provided to couple said chamber to a source of fluid pressure to recenter the element relative to said support structure after displacement of said element relative to said aperture.
  • a support unit according to claim 4 including anchoring means secured to said inner wall and to means static relative to said outer Wall to limit displacement of the innermost part of said inner wall away from said outer Wall.
  • a support unit according to claim 5 including anchoring means between said inner Wall and means static relative to said outer wall, said anchoring means comprising metal braiding.
  • a support unit according to claim 5 including anchoring means bet-Ween said inner wall and means static relative to said outer wall, sa-id anchoring means comprislng a diaphragm.
  • a mine roof support unit comprising a hase frame, a plurality of telescopic props pivotally supported by said frame, a support structure fast with said frame and deining apertures each receiving and llimiting pivotal movement of one of said props, a resi-lient deformable sealtight chamber supported by the rim of each aperture, each of said chambers including oposite walls which are concave and like facing, one lying within the other, said inner wal-l being concave on the exterior and engaging the rim of said aperture and said outer wall being concave on the interior and seating against a concave element carried by said prop means being provided for coupling the interior of each of said chambers with a uid pressure source.
  • a support unit including a pair of spaced guide surfaces on said structure in respect of each aperture, said surfaces slidably receiving said concave element of said prop received by said aperture.
  • a support unit comprising a support element, a support structure defining an aperture which receives said support element, a seal-tight resilient deformable chamber which in cross-section includes :opposite concave walls lfacing in like direction, one of said walls lying within the limits of the other, and a pair of support members respectively carried by said element and said structure of shape corresponding to the exterior of said walls, and the sup'- port member in respect of the outer wall forming ia part of that wall, in the rest state said walls engaging said members, said element being ⁇ co-axial with said aperture, and the innermost part of said inner wall being adjacent the center of said outer wall, means being provided to couple said chamber to a source of Huid pressure to recenter the element relative to said support structure after displacement of said element relative to said aperture.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Tents Or Canopies (AREA)
  • Prostheses (AREA)
US265706A 1962-03-20 1963-03-18 Support units especially for mine roof Expired - Lifetime US3184206A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR891572A FR1325740A (fr) 1962-03-20 1962-03-20 Dispositif de centrage utilisable notamment pour le centrage d'éléments de soutènement

Publications (1)

Publication Number Publication Date
US3184206A true US3184206A (en) 1965-05-18

Family

ID=8774884

Family Applications (1)

Application Number Title Priority Date Filing Date
US265706A Expired - Lifetime US3184206A (en) 1962-03-20 1963-03-18 Support units especially for mine roof

Country Status (6)

Country Link
US (1) US3184206A (fr)
FR (1) FR1325740A (fr)
GB (1) GB980658A (fr)
LU (1) LU43357A1 (fr)
NL (1) NL290436A (fr)
OA (1) OA00407A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3371901A (en) * 1963-08-29 1968-03-05 Karl M. Groetschel Support
US5779210A (en) * 1996-02-09 1998-07-14 Canson; Barney Decorative clay pot hangers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1070311A (fr) * 1953-02-04 1954-07-22 Rech S Ind Et Minieres Soc Et Serrure à frottement pour étançon de mine
DE1034568B (de) * 1957-04-16 1958-07-24 Hoesch Werke Ag Stempelkopflager
US2985419A (en) * 1957-04-13 1961-05-23 Mining Engineering Co Ltd Roof supports for mine workings

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1070311A (fr) * 1953-02-04 1954-07-22 Rech S Ind Et Minieres Soc Et Serrure à frottement pour étançon de mine
US2985419A (en) * 1957-04-13 1961-05-23 Mining Engineering Co Ltd Roof supports for mine workings
DE1034568B (de) * 1957-04-16 1958-07-24 Hoesch Werke Ag Stempelkopflager

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3371901A (en) * 1963-08-29 1968-03-05 Karl M. Groetschel Support
US5779210A (en) * 1996-02-09 1998-07-14 Canson; Barney Decorative clay pot hangers

Also Published As

Publication number Publication date
OA00407A (fr) 1966-05-15
GB980658A (en) 1965-01-13
LU43357A1 (fr) 1963-05-15
NL290436A (fr)
FR1325740A (fr) 1963-05-03

Similar Documents

Publication Publication Date Title
US2944403A (en) Hydraulic jacking assembly for marine platforms
US3924876A (en) Apparatus for installing a heavy mobile machine in a working position
US3184206A (en) Support units especially for mine roof
US2970445A (en) Self-energizing mechanical grippers and wedging ring assembly
RU2203839C2 (ru) Система подвески полезного груза ракеты-носителя, ракета-носитель с этой системой подвески и полезный груз ракеты-носителя
US3382772A (en) Hydraulic cylinder construction
US3154099A (en) Manually adjustable high-low pressure control valve
US3574317A (en) Punctureproof pneumatic tire
US3853165A (en) Tire removal apparatus
US3422505A (en) Two-piece releasable gripper
US4273473A (en) Shock absorbing column
US3309054A (en) Pivotal supporting devices particularly for mine roof supports
US3149829A (en) Self-damping suspension unit
US3522940A (en) Spring element
JPS5910478B2 (ja) 掘削シ−ルド
US3001783A (en) Spring suspension devices for motor vehicles
US2985419A (en) Roof supports for mine workings
US3006151A (en) Expansible mandrel for sinking or driving pipes into the ground
US2938699A (en) Prop-type supporting devices
US3033411A (en) Lifting apparatus for tank with floating roof
US3481573A (en) Hydraulically operated mine roof supports
US3281108A (en) Hydraulic support prop
US3014714A (en) Fluid-pressure springs
US3323771A (en) Roof support suitable for use in mines
US3628637A (en) Extendable support column