US3297292A - Mine prop - Google Patents

Mine prop Download PDF

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Publication number
US3297292A
US3297292A US506186A US50618665A US3297292A US 3297292 A US3297292 A US 3297292A US 506186 A US506186 A US 506186A US 50618665 A US50618665 A US 50618665A US 3297292 A US3297292 A US 3297292A
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Prior art keywords
mine prop
prop
mine
elongated
cross
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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
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US506186A
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English (en)
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Paurat Friedrich-Wilhelm
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Individual
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Individual
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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
    • E21D15/14—Telescopic props
    • E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/02—Lining predominantly with wood

Definitions

  • My present invention relates to the supporting columns or props for mine shafts and tunnels and, more particularly, to yieldable subsurfaces props capable of resisting loads such as those developing in mines and the like upon shifting of soil and rock strata.
  • the principal object of the present invention to provide an improved mine prop which resists buckling and can be made with a predetermined yieldability characteristic and which nevertheless is of relatively simple construction.
  • the mine prop comprises an elongated solid body of a compressible material, preferably wood with its grain extending longitudinally, and a hollow-profile elongated member composed of a material substantially more rigid than that of the body (generally steel or other matter) and forced into one end of the elongated solid body so that the material thereof resists further longitudinal displacement of the member into the body; surprisingly, this arrangement provides much better load-carrying capacity and more eifective yield characteristics than do telescoping arrangements wherein the male member is telescopingly received .in a socket-forming female member.
  • the solid body of compressible material designed to receive the hollow-profile member may be composed of a synethetic resin or some other material mixed with a resinous binder.
  • a synethetic resin or some other material mixed with a resinous binder.
  • the wrapping can be effected substantially over the entire length of the solid wooden body or only over limited longitudinal distances so that, for example, the
  • adjustable abutment means are provided on the hollow profile member for limiting the depth of insertion thereof so that in effect accommodation of the prop to the penetration ratio required for the particular application can be obtained.
  • the member is provided with a cross-section-filling body (e.g. diametrically extending rods or coaxial rings) which provide added surface area and constitute compression bodies designed to increase the resistance to penetration by the hollow profile members.
  • a cross-section-filling body e.g. diametrically extending rods or coaxial rings
  • FIG. 1 is a vertical elevational view of a mine prop according to the present invention
  • FIG. 2 is a detail view of a portion of a mine prop of this type with the wrapping removed;
  • FIG. 3 is a view similar to FIG. 2 of still another mine prop according to this invention.
  • FIGS. 4 and 5 are cross-sectional views taken generally along the lines IVIV and V-V, respectively, of FIG. 1.
  • FIG. 1 I show a mine prop which comprises a solid elongated body 10 of wood whose opposite extremities are provided with wrappings or elements 11 and 12 of a steel band 13 and a wire or cable 14, respectively.
  • Each of these elongated elements ' has its free extremity anchored to the body 10 by turns 15 and 16 of the respective windings in a self-clamping manner while pins or screws 17 and 18 hold the other extremities of each of these elements to the wood bod 10 under tension.
  • the self-clamping action is that provided by turns of the winding which overlie the free end thereof and, being under tension, clamp it in place.
  • the windings 11 and 12 are generally helical and prevent outward spreading of the wood body as hollow-profile members 19 and 20 are respectively driven axially into the wooden body 10.
  • the members 19 and 20 are tubular and of cylindrical configuration; it will be understood, however, that polygonal cross-sections are also suitable for these elements and may be advantageous depending upon the resistance characteristics desired.
  • the upper element 19 is provided with a fork-like head 21 to receive the usual beam or roof structure and has lugs 22 serving as fastening means for struts or other connecting elements to be bolted to the prop.
  • the bottom member 20 rests upon a dome or dish-shaped footing 23 which may also be rigidly connected to the tubular member 20, e.g. welding.
  • FIG. 2 I show a section of a mine prop, which can Otherwise be identical with that illustrated in FIG. 1, in which the insertion portion of the member 19' is formed with axially overlapping and angularly offset slots 24 adapted to receive a Wedge 25 and serving to regulate the length of the prop and the prestressing thereof as previously described. Radial bores and pins may replace the longitudinal slots and wedge shown in FIG. 2.
  • the upper end of the solid wooden body 10 is engageable by a collar in the form of a clamping ring 25' which has a tightening bolt 26 for adjusting the permissible depth of penetration by the member 19".
  • FIGS. 4 and 5 over a length of about 10-20 cm.
  • each of these tubular members or either of them can be provided with a further compression body such as the ring 27 illustrated in FIG. 4 or the bars 29, 30 of FIG. 5.
  • This ring is held in place by diametral ribs 28 and serves to increase the resistance to penetration by filling part'of the cross-section of the tubularmember.
  • the rods 29, 30 (FIG. extending along diameters of the tubular element 20, partially fill the cross-section 'of the latter. and increase the com pressive forces.
  • the upper end of member 20 ' is beveled inwardly at 31 to facilitate insertion into the wooden body 10.
  • a yieldable mine prop comprising an elongated solid body of a compressible'material; an elongated hollowprofile member composed of a material substantially more rigid than that ofsaid body of a cross-sectional area less than that of said body and forced into the latter at one end thereof whereby the material of said body'resists further displacement of said member into said body, and an elongated flexible element wrapped around at least said end of said body and anchored thereto for resisting outward expansion of 'said'body upon insertion of said member therein.
  • abutment means includes an abutment ring clamped around said member.
  • said member includes a plurality .of angularly ofiset longitudinally overlapping and-longitudinally extending slots formed in said member, said abutment means including a wedge selectively receivable in said slots.

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  • 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)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Piles And Underground Anchors (AREA)
  • Rod-Shaped Construction Members (AREA)
US506186A 1964-11-04 1965-11-03 Mine prop Expired - Lifetime US3297292A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP35438A DE1238420B (de) 1964-11-04 1964-11-04 Stempel aus Holz fuer den Ausbau von Untertageraeumen, insbesondere fuer den Streckenausbau

Publications (1)

Publication Number Publication Date
US3297292A true US3297292A (en) 1967-01-10

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US506186A Expired - Lifetime US3297292A (en) 1964-11-04 1965-11-03 Mine prop

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US (1) US3297292A (de)
DE (1) DE1238420B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028496A1 (de) * 1979-11-02 1981-05-13 Mine Support Systems (Proprietary) Limited Holzstempel
US4470636A (en) * 1980-12-24 1984-09-11 Paurat F Mining machine excavator drum having liquid spray control
US4915339A (en) * 1982-08-06 1990-04-10 H L & H Timer Products (Proprietary) Limited Mine prop
US5271596A (en) * 1988-10-19 1993-12-21 Holcomb Grove R Method and apparatus for bracing elevated concrete forms
WO2001014692A1 (en) * 1999-08-20 2001-03-01 Jan Hendrik Woller Yielding mine prop
US20150204192A1 (en) * 2012-07-23 2015-07-23 Saltus Poles Cc Mine roof support

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE344312C (de) *
DE305946C (de) *
GB191228784A (en) * 1912-05-20 1913-01-30 Alwin Lantzsch Improvements in Miners' Props.
DE494100C (de) * 1927-12-03 1930-03-18 Hugo Klerner Nachgiebiger, eiserner Teleskop-Grubenstempel, dessen Unterteil mit einer Einschnuerung versehen ist
US2699914A (en) * 1949-10-14 1955-01-18 Liljendahl Sven Algot Joel Prop

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE289473C (de) *
DE239950C (de) *
DE826588C (de) * 1948-10-02 1952-01-03 Alfons Barenberg Zweiteiliger rohrfoermiger Tragsaeulenaufsatz fuer Holzstempel
DE924685C (de) * 1951-11-01 1955-03-07 Adelheid Emmi Luka Nachgiebiger Grubenausbau

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE344312C (de) *
DE305946C (de) *
GB191228784A (en) * 1912-05-20 1913-01-30 Alwin Lantzsch Improvements in Miners' Props.
DE494100C (de) * 1927-12-03 1930-03-18 Hugo Klerner Nachgiebiger, eiserner Teleskop-Grubenstempel, dessen Unterteil mit einer Einschnuerung versehen ist
US2699914A (en) * 1949-10-14 1955-01-18 Liljendahl Sven Algot Joel Prop

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028496A1 (de) * 1979-11-02 1981-05-13 Mine Support Systems (Proprietary) Limited Holzstempel
US4470636A (en) * 1980-12-24 1984-09-11 Paurat F Mining machine excavator drum having liquid spray control
US4915339A (en) * 1982-08-06 1990-04-10 H L & H Timer Products (Proprietary) Limited Mine prop
US5271596A (en) * 1988-10-19 1993-12-21 Holcomb Grove R Method and apparatus for bracing elevated concrete forms
WO2001014692A1 (en) * 1999-08-20 2001-03-01 Jan Hendrik Woller Yielding mine prop
US20150204192A1 (en) * 2012-07-23 2015-07-23 Saltus Poles Cc Mine roof support
US9752435B2 (en) * 2012-07-23 2017-09-05 Setevox (Pty) Ltd Mine roof support

Also Published As

Publication number Publication date
DE1238420B (de) 1967-04-13

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