Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2667037 A
Publication typeGrant
Publication dateJan 26, 1954
Filing dateAug 24, 1949
Priority dateAug 24, 1949
Publication numberUS 2667037 A, US 2667037A, US-A-2667037, US2667037 A, US2667037A
InventorsBarry Anthony J, Thomas Edward M
Original AssigneeBarry Anthony J, Thomas Edward M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Suspension roof support
US 2667037 A
Images(2)
Previous page
Next page
Description  (OCR text may contain errors)

v Jan- 25, 1954 E. M. THOMAS ETAL 2,667,037

SUSPENSION RooP SUPPORT Filed Aug. g4, 1949 2 Sheets-Sheet 2 Patented Jan. 26, 1954 EdwardM.. Thomas; College Park,

and Anthony J.

Barryfy University-Park,A Md.. ApplicationAug-ust'Zl, 1949, Serial No. 112,152

G-iGlaims. 1

Thisl invention relates to thesupporting of roofs of mines and. other undergrounci workings; and more partieul'arlyA to suspensionsupports or roof` bolts for supporting timbering elements. or cross beams against the' roof-i of such; al mine: or underground` working, thereby eliminating the need of uprights er props beneath the endsoftbe cross timbers or beams.

In the excavationVr of" mines andvarious-types ci' subterranean tunnels, itist'he customary practice. as the mine or tunnelE is extended; to: place' cross timbers underfthe stratied rock'or*earth:forma-l tion which' forms the roof of`the= mine or tunnel to prevent roof fallsv or cave-ins; These cross timbers or roof" supports arey ordinarily held: up against' the roofy of the'mine or tunnel-fb'y vertical posts or props arranged at each side of the entry or tunnell beneath the ends of' the cross timbers; usually spaced quits` close togetherfa. considerable amount of` timberl is employed? for.Y timb'ering; Also since the' timber isusuali'y ofsubstantial-dimensionsit reduces the useful' width oftheentry or tunnel and' requires` added' clearance for'mine cars, locomotives and other mining equipment. The present' invention contemplates. improve.- ments over known types of" roof supportsfor undergroundi mines or: tunnels whereby the'V root.l supported in; a ncveli manner without theuseiof vertical posts or propsfo'rlioliiing-thecross beams c orv otherroof supporting mei'nbersin.p'l'ace. Such type of prop-eliminating roofsupports arefpar'- ti'cularly desirable-for use-'withicontinuous mining apparatus which is becoming prominent. in the continuous mining oi coal or'other minera-ls.

The present invention has for its main;y object to provideimproved' suspension supports which may' bev anchoredfin tbe-L stratied roofofithe mine entry-#oretunnei and provide supportsffor tine-1 cross beams or" other` supporting members. which` are placed against the roof; Another objectf is. to provide animproved tension bolt?.structurefwhera by the cross beams or other#supporting.l members may bermlylield in: place-against the ronf A further object i's to providelimprovezitensionf belt structures which are placed in holesf suitably drilled 0r` otherwise formed" in' the.strafti-1'-`reo`l roof and; firmly 'securedi in position therein whereby the possibility ofA undesired release of. the.' bolt structures is reduced* t'o af minimum; Yet' an other obj ect is to provide improved expansionibot structureswhereby the; supporting bcits: for the cross beams err other" supporting mem-bers may be ljocked in piace and. rmly= seeureif as bye-ce inenting in position; Yet anotherV obg'eet-i is--to f Since the'. customary v rootV` Supports; are n K jects and advantages: of' thea ever, morek fully' appear.

provide improved means for sealngtheilioleitrom thev atmosphere after the expansion` bolt se'- cured in place in the hole'. Theseandi otlier-ob^ invention-will how In the accompanying` draw-ings' there are shown for purposes off' illustration two forms which the invention may assume in practice:

In these drawings:

Fig. 1 is a fragmentary sectional viewJ through a section of the roof stratashowing theiimproved expansion bolt prior to'A securing: tlie` same inexe panded position in a: hole"` d'rlled inA the roof strata.

Fig. 2 is a fragmentary sectional: viewsimilar to Fig. 1, Showing the expansion boirduriagivne cementing operation.

Fig. Bis an enlarged cross sectionalviewtaken substantially 0nnne 3=si Greig. 1.

Fig. 4"' is an enlarged centrali longitudinal' tional View'through the improved expansion 'colti Fig. 5^: is a somewhat diagrammatic cross'4 sectional View througha mine entryz orftunnel? show'- ing'a; cross beam secured imposition bythe'anelior bolts: againstr the rooY..

Fig. 6 is a fragmentary sectional? ViewY similar to Fig. 1f, showing a; modified form of expansion bolt construction.

Eig. 7 is aY View' similary to Eig: di snowing` tl'ie expansionY bolt in expanded position and a cementing orV groutingr means associa-ted; therewith.

Fig'. 8T is a similar view showing' ther anchor boltsecuredf firmly' in*` the rockstrat'a ini a pesi-- tion tosupport the cross beam against'zthercof Fig: 9l is a somewhzeitdiagrammatic cross` seen tional View through a mineentry ontunnelsliowing ai cross beam'. secured in positionl against`= the reef' by.i meansS off the modified anchor bolts:-

As shown in. theidrawirrgs; Ac designates-tirando lwalls or ribs of a mine entry'm:i tunne; Bi i'sa tn:- roof; and Ci roof supports which may be either timbers or structural'` steer cross beamsA herein-s sirably tl`1elatterdue to thergreater' compact ness. They cross. beams; extend substantially across the full? width'. of.' the' entry or tunnel! up against the roof; and.J are supported. in position by the suspension supports s constituting' tlieepresrent invention.

In the illustrative embodimentsbown'zinzligsrl to 5y inclusive; the: suspension: supports or neef boltsv are generally designated andare each@ pn;- sitionerif` in. oblique: hole; D: suitably; di'illerl or otherwise;- formedfin the rockistrata (unearth roliamation: which forms the roofl oftgrehentryfortungnel.` Eachsuspension support' orf root`r belt termS` when the bolt is so .suitable hand gun or pump prises an elongated tubular body or bolt portion 2, desirably of cylindrical form, having a threaded lower end portion 3 which is threadedly engaged by a nut 4. Each cross beam C has appropriately located openings through which the bolts pass, and angle washers 6 surround the bolts between the nuts 4 and the cross beam and lie against the bottom face of the latter in the manner shown. The upper end portion cf the bolt is threaded at 1 and threadedly engages a wedgeshaped sleeve 3 as shown in Fig. 4. Surrounding the upper portion of the bolt and resting at its lower end against a washer 9 seated against a shoulder I0 on the bolt, is a sleeve II which is slotted as at I2 to provide resilient fingers I3. The washer 9 and sleeve I I provide an outwardly offset enlarged head portion on the bolt 2. The bolt may have a polygonal socket I4 or polygonal end portion adapted for engagement by a suitable rotating instrument such as a wrench. Thus when the bolt is suitably rotated the wedgesleeve 8 is forced inwardly within the split sleeve II to expand the fingers I3 thereof into firm contact with the walls of the drill hole to secure the bolt in position. The tubular bolt body has a central bore I6 and lateral openings I'I traversing the bolt a short distance below the shoulderIIJ in the manner shown, and the lower end of this bore is threaded at I8 for connection of a suitable attachment I9 for a pipe or hose '20 (Fig. 2). When the roof bolt is secured in its expanded position in the hole D as shown in Fig. 2 wherein it firmly holds the cross beam C against the roof a quick-hardening cement or other ller may be pumped through the pipe 20, the bore I6 in the bolt and the lateral holes I'I into the space surrounding the bolt and into the hole which receives the expansion device so that the anchor bolt is firmly held in place when the cement or filler hardens or sets'. air from the hole. The tubular body of the expansion bolt may be suitably corrugated along its exterior periphery or may be provided with suitable projections 2I spaced along its length to aid the enlarged head portion in securing the bolt in position in the rock strata. By tightening the nuts 4 of the bolts against the angle washers 6 the cross beam may be rigidly held in place against the roof in the manner shown in Fig. 5. Now referring to the modified construction shown in Figs. 6 to 9 inclusive it will be noted that the anchor bolt comprises a cylindrical body portion having a threaded lower end portion 26 and the upper end portion of the bolt is formed with an outwardly offset enlarged head portion 21. This head portion is longitudinally split at 28 to provide resilient fingers 29 which have tooth-like serrations 30 on their outer surfaces. The inner walls 3I -of the resilient fingers 29 are relatively inclined and a vwedge`32 is placed in the tapered space between the fingers as shown in Fig. 6. When the bolt is driven inwardly the wedge 32 contacts the bottom of the drill-hole so that as -driving in of the bolt is continued the fingers 29 are expanded to bring the teeth thereof into rm contact with the walls of the hole. In Fig. 7 the anchor bolt is shown in expanded position and arranged a yieldable hood 35 encloses the lower end of the bolt and tightly contacts the roof to provide a substantial seal at the mouth of the drill-hole. An air vent tube 36 extends through this seal into the drill-hole along the side of the bolt in the manner shown.

31 which is filled with .quick-hardening cement or other filler has its The cement also seals out nozzle 38 extended through a hole 39 in the hood so that when the pump is operated the cement or grouting is discharged into the space between the bolt body and the walls of the hole. During this pumping operation any air in the hole is discharged through the vent tube 36 and as the space becomes lled with cement the vent tube may be withdrawn from the hole, When the cement becomes hardened the anchor bolt is firmly held in place in the rock strata and the hole is sealed to atmosphere. The cross beam C is then placed against the roof, the angle washer inserted in position and a nut 40 threaded on the lower end of the bolt may then be tightened to secure the cross beam rmly against the roof. In Fig. 9 the cross beam is shown secured in position against the roof of the mine entry or tunnel by means of the appropriately located anchor bolts.

In both embodiments of the invention evidently various other types of conventional expansible bolt heads may be employed in lieu of those disclosed. Moreover, in both employments, the mode of use of the suspension supports is essentially the same. The holes are first suitably formed in the desired location in the roof strata., the suspension bolts are then inserted in the holes and suitably expanded into contact with the holes walls, and finally quick-setting cement or filler is pumped into the spaces around the bolts to secure the latter firmly in position in the roof strata and to seal the hole. When the bolts are properly fixed in place the cross beams are placed in position against the roof with the lower ends of the bolts extending through the openings in the beam,

' and the nuts are then threaded onto the bolts and tightened to secure the cross beams against the roof.

As a result of this invention an improved roof supporting means is provided for mines or other underground workings whereby the usual upright timbers or props are eliminated thereby providing the mine entry or tunnel with greater useful width and increasing the roof clearance. One of the advantages of the improved roof support is that the suspension supports or roof bolts used for the purposes of the invention, are firmly supported in holes drilled in the roof strata and are thereby prevented from bending or buckling as generally occurs in the case of timber-props. Props, moreover, are liable to slip on off-center loading, just when stability is most required. Moreover, if, after the cross beam or other supporting member has been drawn into contact with the roof by the bolts, the roof sags slightly, the roof support will still be firmly held in position. Another advantage of the improved roof support is that the cross beams or other supporting mem* bers may be secured in place against the roof immediately after the coal or other 'material has been broken down and before its removal, before the subsidence of the roof has started. By cementing the tension bolts in the roof strata, danger of the bolts pulling loose, is substantially avoided. The cement not only firmly secures the bolts in place but also seals the drill hole to the atmosphere, thus retarding disintegration of the roof rocks, and, Where water is encountered in drilling, prevents corrosion of the steel supporting bolts. Other uses and advantages of the in vention will be clearly apparent to those skilled in the art. f

While-there arein this application specincalls7 described-two forms which the inventionmay as sume in practice, it will be understood that these forms of the same are shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What We claim as new and desire to secure by Letters Patent is:

1. A supporting structure for the roof supports of a mine or the like, comprising a plurality of anchor bolts secured in position in holes formed in the roof strata, each bolt comprising an elongated hollow body, an enlarged expansible head at the upper end of the body outwardly offset therefrom, mechanical means for effecting expansion of the bolt head to secure the bolt in firm contact `with the holding-walls, said bolt having means for conducting a quick-setting cement into the spaces around the bolt and expanded bolt head within the hole to effect firm securing of the bolt in supporting position in the roof strata.

2. A supporting structure for the roof supports of a mine or the like, comprising a plurality of anchor bolts secured in position in holes formed in the roof strata, each bolt comprising an elongated hollew body, an enlarged expansible head at the upper end of the body outwardly offset therefrom, mechanical means for effecting expansion of the bolt head to secure the bolt in firm contact with the holding-walls, said bolt having means for conducting a quick-setting cement into the spaces around the bolt and expanded bolt head within the hole to effect firm securing of the bolt in supporting position in the roof strata, said means for conducting cement to the hole around the bolt including a passage in the bolt communicating with the space around the bolt just below the expanded bolt head.

3. A supporting structure for the roof supports of a mine or the like, comprising a plurality of anchor bolts secured in position in holes formed in the roof strata, each bolt comprising an elongated hollow body, spaced projection means on said body, enlarged expansible head at the upper end of the body outwardly oifset therefrom, mechanical means for effecting expansion of the bolt head to secure the bolt in firm contact with the hole-walls, said bolt having means for conducting a quick-setting cement into the spaces the hole to effect firm securing of the bolt in supporting position in the roof strata, said means for conducting cement to the hole around the bolt including a passage in the bolt communicating with the space around the bolt just below the expanded bolt head and a supply attachment associated with the lower end of the bolt.

4. A supporting structure for the roof supports of a mine or the like, comprising a plurality of anchor bolts secured in position in holes formed in the roof strata, each bolt comprising an elongated body, an expansible head at the upper end of the body, mechanical means for effecting expansion of the bolt head to secure the bolt in iirm contact with the hole walls, said bolt having means for conducting a quick-setting cement into the spaces around the bolt and expanded bolt head lwithin the hole to effect firm securing of the bolt in supporting position in the roof strata including a supply attachment mounted adjacent the lower end of the bolt comprising a flexible sealing hood enclosing the lower end of the bolt and tightly engaging the roof at points surrounding the mouth of the hole.

5. A supporting structure for the roof supports of a mine or the like, comprising a plurality of anchor bolts secured in position in holes formed in the roof strata, each bolt comprising an elongated body, an expansible head at the upper end of the body, mechanical means for effecting expansion of the bolt head to secure the bolt in firm contact with the hole-walls, said bolt having means for conducting a quick-setting cement into the spaces around the bolt and expanded bolt head within the hole to effect rm securing of the bolt in supporting position in the roof strata including a supply attachment mounted adjacent the lower end of the bolt comprising a flexible sealing hood enclosing the lower end of the bolt and tightly engaging the roof at points surrounding the mouth of the hole, and an air vent tube extending from the exterior of said hood into the hole.

6. A supporting structure for the cross beams which support the roof of a mine or the like comprising a plurality of anchor bolts secured in position in cbliquely disposed holes formed in the roof strata, the cross beams having holes through which the lower ends of the bolts extend and said bolts having nuts threaded on their lower portions for firmly securing the cross beams against the roof, each of said bolts comprising an elongated body insertible in a hole and having an enlarged expansible upper head outwardly offset from said body, means for effecting expansion of said head to cause the bolt to grip the holewalls, said bolt having means for conducting a quick-setting cement intothe spaces around the bolt body and said expanded head for firmly securing the bolt in position in the hole, said conducting means embodying means for preventing discharge of cement through the mouth of the hole during filling of the hole-spaces.

EDWARD M. THOMAS. ANTHONY J. BARRY.

References Cited in the file of this patent OTHER REFERENCES Engineering and Mining Journal, May 1943, pages -72.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1270659 *Apr 18, 1918Jun 25, 1918Sylvain Louis RavierWorks such as retaining-walls, piers, and wharves.
US1883196 *Jan 20, 1930Oct 18, 1932Wertz Louis SProcess of repairing masonry structures
US2442113 *Jul 25, 1946May 25, 1948Sytse Beijl ZakoTunnelling and like subterranean operations
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2829502 *Dec 17, 1953Apr 8, 1958Joseph B DempseyMine roof bolt installation
US2900863 *Mar 7, 1955Aug 25, 1959Kwik Set Expansion CoExpansion bolt and wedge with a cylindrical holding section
US2930199 *Dec 5, 1955Mar 29, 1960Jarund Harry Sigurd ValdemarMethod of anchoring bolts
US3027796 *May 21, 1957Apr 3, 1962Shewmon Daniel CBolt with driving head shearable at pre-determined torque
US3059436 *Mar 19, 1956Oct 23, 1962Hermann Jr George FPiling
US3104582 *Jan 14, 1959Sep 24, 1963Claude C WhiteResilient shell with enlarged end for engagement in a mine roof
US3139730 *Feb 17, 1955Jul 7, 1964Williams Chester IRock anchor
US3201906 *Mar 8, 1962Aug 24, 1965Pasquale FicheraLoad suspension apparatus and related methods
US3212269 *Mar 1, 1962Oct 19, 1965Horace W OlsenGrouted anchor structures
US3216200 *Jul 15, 1960Nov 9, 1965Fenix Gilbert JUnderground pressure vessel construction method
US3222873 *Jul 31, 1961Dec 14, 1965Williams Chester IGroutable rock anchor
US3226934 *May 16, 1961Jan 4, 1966C I M Consultants LtdRock bolts
US3234742 *Jul 5, 1962Feb 15, 1966Williams Chester IGroutable rock bolt assembly and procedure
US3247754 *Aug 8, 1963Apr 26, 1966Dennis W BieserSelf-drilling anchor bolt
US3260053 *Oct 30, 1962Jul 12, 1966Dayton T Brown IncStabilizing mine roofs
US3316797 *Jan 29, 1964May 2, 1967Williams Chester IRock bolt with conduit
US3324662 *Oct 20, 1965Jun 13, 1967American Cyanamid CoValved rock bolt
US3324756 *Jun 25, 1965Jun 13, 1967Williams Chester IBail-type anchor device for a hollow rock bolt
US3326004 *Dec 2, 1965Jun 20, 1967Williams Chester IProcedure for reinforcing a rock formation
US3332312 *Feb 16, 1967Jul 25, 1967Phillips Drill CoExpansion stud anchor
US3349567 *Jun 3, 1964Oct 31, 1967Munn John EMine roof support and method of providing same
US3349662 *Jun 23, 1965Oct 31, 1967Williams Chester IRotatively-set anchor assembly for a mine bolt
US3363422 *Mar 19, 1965Jan 16, 1968Lee A. TurzilloMethod and apparatus for anchoring a tie-down bar in an earth situs
US3377807 *Jun 15, 1966Apr 16, 1968Vincent NaveAnchor bolt assembly
US3389561 *May 23, 1966Jun 25, 1968English Electric Co LtdMethod of and apparatus for providing anchors in earth and/or rock formations
US3427811 *Mar 22, 1967Feb 18, 1969White Claude CMine roof support system
US3430449 *Oct 31, 1966Mar 4, 1969Novotny RudolfAnchor bolts and method for fixing same in drill holes especially in friable rock
US3505824 *Feb 5, 1969Apr 14, 1970Claude C WhiteRoof support of underground mines and openings
US3509726 *Jun 25, 1969May 5, 1970Claude C WhiteRoof support for underground mines and openings
US3695045 *Feb 3, 1970Oct 3, 1972Williams Chester IRock bolts
US3837258 *Jul 3, 1972Sep 24, 1974Williams CRock bolts
US3849992 *May 23, 1973Nov 26, 1974Exchem HoldingsReinforcing elements for stabilization of rocks
US4091628 *Feb 25, 1977May 30, 1978Jay Hilary KelleyPrestressed elastic arched mine roof support
US4179992 *Apr 4, 1978Dec 25, 1979The United States Of America As Represented By The Secretary Of The ArmyPrimer-igniter for gun propellants
US4270331 *Mar 8, 1979Jun 2, 1981Hilti AktiengesellschaftMethod of securing an expansion dowel including a metallic expansion sleeve
US4369003 *Jan 31, 1980Jan 18, 1983Gebirgssicherung GmbhRock anchors
US4395161 *Nov 19, 1981Jul 26, 1983Bethlehem Steel CorporationTransition plate for a mine roof truss
US4395859 *Jun 5, 1980Aug 2, 1983State Of Illinois, Department Of TransportationMethod and apparatus for securing an object to a support structure
US4456405 *Dec 13, 1982Jun 26, 1984Alex GalisMine roof truss assembly and associated method
US4601616 *Mar 13, 1985Jul 22, 1986Jennmar CorporationRoof support system for a mine and the method and tooling for providing the same
US4630974 *Mar 13, 1985Dec 23, 1986Price & AdamsRoof support system for a mine and method for providing the same
US4632605 *Nov 16, 1983Dec 30, 1986Gearhart Australia LimitedMethod and apparatus for reinforcing and consolidating earth structures
US4636115 *Nov 10, 1980Jan 13, 1987The Curators Of The University Of MissouriExpansion bolt and mine roof reinforcement therewith
US4934873 *Aug 8, 1988Jun 19, 1990Jennmar CorporationMine roof support utilizing roof anchors having eye-bolt heads
US4954017 *Sep 10, 1986Sep 4, 1990The Curators Of The University Of MissouriExpansion bolt and mine roof reinforcement
US4979848 *Nov 2, 1989Dec 25, 1990Gerhard SauerDrilling device
US5292209 *May 14, 1993Mar 8, 1994Jennmar CorporationBearing plate
US5302056 *Oct 16, 1992Apr 12, 1994Jennmar CorporationMethod and apparatus for supporting a mine roof
US5450663 *Oct 26, 1993Sep 19, 1995Jennmar CorporationMethod for fabricating a truss member for a mine roof support
US5466015 *Nov 13, 1992Nov 14, 1995Berenter; AllenApparatus and method for mounting items at an inaccessible wall surfaces
US5525013 *Oct 31, 1994Jun 11, 1996Seegmiller; Ben L.Cable bolt structure and related components
US5531545 *May 11, 1995Jul 2, 1996Seegmiller; Ben L.Cable bolt structure and method
US5634752 *Feb 2, 1995Jun 3, 1997Fischerwerke Artur Fischer Gmbh & Co. KgAnchor bolt for anchoring by compound mass, and method of manufacturing the same
US7896580 *Nov 8, 2006Mar 1, 2011Sandvik Intellectual Property AbSelf drilling rock bolt
US7896581Dec 2, 2005Mar 1, 2011Rhino Technologies LlcRe-tensionable cable bolt apparatus and related method
US8376661May 21, 2010Feb 19, 2013R&B Leasing, LlcSystem and method for increasing roadway width incorporating a reverse oriented retaining wall and soil nail supports
US8550751Aug 3, 2010Oct 8, 2013Dsi Underground Systems, Inc.Non-tensionable cable bolt apparatus and related method
US8708597Jan 24, 2013Apr 29, 2014R&B Leasing, LlcSystem and method for increasing roadway width incorporating a reverse oriented retaining wall and soil nail supports
USRE35902 *Mar 7, 1996Sep 22, 1998Jennmar CorporationBearing plate
DE1182185B *Jun 15, 1961Nov 26, 1964Erich Fritz Dipl IngGebirgsanker fuer den Ausbau von Untertageraeumen
DE3529850A1 *Aug 21, 1985Mar 13, 1986Fip IndAnchoring method with stable adhesive strength for the consolidation of rock masses disturbed by excavation work, and implement used for this purpose
DE3608332A1 *Mar 13, 1986Sep 18, 1986Jennmar CorpDachstuetzvorrichtung und -verfahren fuer einen grubenraum und werkzeug zum spannen der dachstuetzvorrichtung
EP0143534A2 *Sep 28, 1984Jun 5, 1985The Eastern Co.Mine roof support system
EP1455099A1 *Feb 20, 2004Sep 8, 2004SMK Meister GmbH & Co. KGPeg for the assembly of construction units at concrete ceilings
WO1993010316A1 *Nov 13, 1992May 27, 1993Allen BerenterApparatus and method for mounting items at an inaccessible wall surface
Classifications
U.S. Classification405/259.3, 411/15, 405/259.5, 52/698, 405/259.4, 156/94
International ClassificationE21D20/02, E21D20/00
Cooperative ClassificationE21D20/021
European ClassificationE21D20/02B