Патент USA US2121303код для вставки
June> 2l, 1938. R, R, RQBERTSON 2,121,303 DOUBLE DOWEL BAR EXPANSION JOINT Filed Sept. 24, `193'? f l. j * /î` JMA/ß ROBERT R. ROBERTSON I @,~ fig/5. Patented June 21, 1938 v2,121,303 ` UNITED 1~ ls'rAf?rl-is l PATENT Ilol-‘lálczlai 2,121,303 DOWEL BAR, EXPANSION JOINT Robert R. Robertson, Chicago, Ill., assigner to The Translode Joint Company, Chicago Heights, Ill., a~corporation of ‘Illinois Application September 24, 1937, Serial N0f165,439 l (cl. 94-18) The present invention pertains to road joints and more particularly to an improved type oi` tecting housings affording recesses for the recep tion of the inner ends of do'wel bars which project road expansion joint adapted to be embedded be-` in 'slidable overlapping engagement through a _ tween -adjacent concrete road slabs, said joint 5 ,including vin combination a precast _plastic filler board adapted to be supported upon a road sub filler board opening and have theouter ends thereof formed to provide anchors for anchoring the outer ends of the dowell bars in adjacent road grade andhaving openings provided therein at slabs. spaced intervals for the reception of adjustable load transmission units, each of which consists 10 of overlapping dowel bars,~the outer ends of which are formed to be anchored' in the adjacent in the specification drawing. road slabs while the'inner ends- ofthe dowel A j. 15 ' O_ther and further important objects of this invention will be apparent from 'the disclosures and the accompanying Í l f » The invention, in a preferred form, is illustrated barsproject in opposite directions through an in the drawing and hereinafter more fully de opening of the ñller board and into pockets or scribed. Íhousings forming part of flanged supporting plates engaged on opposite sides of the filler board with the flanged portions of the -plates resting upon the road sub-grade and staked thereto. ` On the drawing: _ ß Figure 1 is a fragmentary side elevation of an expansion joint forming mechanism embodying the principles of this invention and disclosingr the ~ It is an object of this invention to provide a ` apertured ñller board with spaced load transmit road expansion joint" comprising a preformedl ting units engaged therein and showing one of plastic ñller board having openings provided at the openings unfilled. spaced intervals throughout the length thereof for the reception of slidably overlapping double line II-II of Figure 1 showing the expansion* \ 't ‘ Figure 2 is an enlarged sectional View taken on f dowel bars, carried in supports on opposite sides L' joint forming mechanism embedded in the con crete road slabs and supported on the road sub-' road slabs for the transmission of loads from one grade, and furthermore illustrating one-half of road slab through the joint -to an adjacent road fone of the units in elevation, While the opposite 25 of the filler board and anchored in the adjacent slab. 30 ' ' ' ' # It is also an object of this invention to provide 7 a road expansion joint including a preformed -íillerboard having -openings therein to permit a plurality of sets of slidably overlapping double dowel bars to project therethrough, with the outer ' half is in section. Y _. > Figureß is an enlarged vertical detail section taken on line III-III 0f Figure 2. Figure _4 is a fragmentary side elevation of a_ portion of a modiiied form of road expansion joint load transmission unit wherein the dowel »ends of each set of the dowel bars anchored in bar supports are provided with modified forms of adjacent road slabs and having the inner ends pockets or housings for the reception of portions engaged in protecting pockets forming part ofV of the overlapping dowel bars. - supports for the double dowel bars and disposed Figure 5 ls a_ fragmentary transverse detail on opposite sides of the filler board. section taken on line V-V of Figure J4. ` As shown on the drawing: ' ’ Another~ object of the invention is theprovision L10 of a road expansion joint in which an apertured ' V 'I'he expansion joint, as illustrated in VFigures 1 ñller board has a plurality of sets of overlapping ,to 3 inclusive is formed by means of joint form dowel bars projecting therethrough with the outer ing mechanisms adapted to be supported on -a ends of the dowel -bars anchored in adjacent road sub-grade I for embedding between concrete road slabs while the inner ends of the dowel vbars ’road slabs 2 and 3. l are slidably engaged inpockets provided in the ' The improved expansion joint forming mecha `,road slabs opposite from the slab in which the lnism comprises a preformed or precast» plastic outer ends of said dowel bars are anchored. _ . y y ñller board I constructed out of asphalt, sponge 1 It is an important `object of this invention to rubber, cork, or/«any other suitable compressible, provide an improved "concrete road expansion material, such for example as a compressible'ma 50 joint mechanism including a preformed plastic »a terial known to the trade as “Flexcel". The flller filler board having openings provided at spaced ' board or core member I _is provided with a plu rality vof spaced openings 5 for the reception of intervals therein for the reception of load trans mission units, each of which consists of a pair of load transmitting means forming a part of a load spaced angle supports positioned on opposite - transmission unit, one of which is associated with ' ..55 sides of the filler board and provided‘with pro each of the filler board openings 5. . 'n 2 . ' 2,121,303 Each of the load transmission units comprises a pair of oppositely positioned metal plates 6 adapted to be' positioned against opposite sides With the expansion joint forming mechanism secured in position transversely upon the road sub-grade, concrete is poured on opposite sides of the filler board 4 adjacent one of the openings 6. Each of the metal plates 6-has integrally formed on the lowei` margin thereof an outwardly projecting base ñange 'I which seats upon the top of the ñller board to form the concrete slabs 2 and 3 and to embed the housings and the an choring ends I5 of the dowel bars I4. It will thus be noted that the double dowel bars of each of surface of the sub-grade I, as clearly illustrated in Figure 2. -Each of the metal plates 6 has an adjacent road slabs and project through an open the load transmission units are anchored in the ing 5 of the iiller board 4 in slidable overlapping 10 ilange 8. A socket or housing is secured to the relationship with respect to one another permit outer side of each of the plates 6 in register with ‘ ting the ends of the dowel bars to project in op posite directions and slidably engage in the cham the opening in the plate 6 and with one of the openings 5 in the ñller board 4. The socket or bers I6 of the sockets or housings forming parts of the two angle plates 6 which are positioned 15 15 housing comprises a top plate 9, the side margins of which are deflected to provide side walls I0. on opposite sides of the filler board. With the One end of the top wall 94 is bent outwardly to expansion and contraction of the road slabs due provide a mounting flange I I which is spot welded to temperature changes, the overlapping dowel bars of the load transmission units are slidably or otherwise rigidly secured to the outer .surface of a plate 6. The outer end of the top plate 9 moved in opposite directions through the filler board and the plates 6. The improved expansion is deiiected to provide an end wall I2 and a pro joint- also is adapted to transmit loads applied jecting flange I3. . > to one of the road slabs through the joint mecha Each of the sockets or housings which are at nisms to the opposite road slab. 'I'he trans tached to the plate 6 has an open portion oppo site the plate 9 which is closed by means of a mission of loads isaccomplished by means of the 25 dowel bar I4 to which the socket or housing double dowel bar constructions forming part of flange I3 is spot welded or otherwise rigidly the spaced load transmission units associate secured. The dowel bar has slidable contact with with the ñller board 4. Y Figures 4 and 5 illustrate a modiñed form of the the plate flange 8 which acts as a guide for the slidable movement of the dowel bar. The outer load transmission units associated with the aper .30 end of each dowel bar I4 is longitudinally split tured filler board.~ The modified vform of load 10 opening formed therein by striking outwardly a , with the split portions deflected upwardly and downwardly to form anchoring ?ngers or blades I5. >The end portion of each of the dowel barsl opposite the anchoring blades I5 projects through transmission unit comprises spaced angle plates I8 having openings therein with the openings of the opposite plates positioned directly opposite one another. Rigidly secured on the outer face of 35 the opening in the plate 6 and through an open Veach of the angle plates I8 is a socket or housing I8 closed at the top, bottom, and at both sides. ing 5 of the iiller board 4 and then through the Upwardly and downwardly projecting flanges 20 opening in the opposite plate 6 and into a cham ber I6 in the opposite socket or housing. This are integrally formed on one end of the housing arrangement, as clearly illustrated in Figure 2, I9 and are spot welded or otherwise rigidly se 40 Y positions the inner end portions of the two dowel cured to the outer face of the angle plate I8. bars I4 in slidable overlapping engagement with Integrally formed on the outer end of each of respect to one another, so that the two dowel the housings I9 is an end plate 2I which closes . bars projectl through an opening 5 of the filler only’ half of the fouter end of the housing. In te'grally formed with the end plate 2| is a flange is 45 >board 4 in opposite directions permitting the ends of the dowel bars to have slidable engagement in 22 which is spot welded or otherwise rigidly the sockets or casings provided on the joint secured to a load transmitting dowel bar 23. The double dowel bars shown in Figure 4 are con plates' 6 on opposite sides of the filler board. The improved expansion joint forming mecha nism, as hereinbefore described, comprises the apertured ,ñller board 4 which has associated therewith a plurality of load transmission units, each of which comprises a pair of oppositely posi tioned angle plates having sockets or housings projecting therefrom. Rigidly secured to each .55 of the housing flanges I3 is a dowel bär which ' serves to-close an opening in the socket or hous ing. One end of each of the dowel bars is formed to be anchored in` a concrete road slab while the opposite end of the dowel bar slidably projects through the iiller board .and into a'chamber of the socket or housing of the opposite angle plate. The expansion joint forming mechanisms, as f ` illustrated in Figurevlpare adapted to be posi 65 tioned transversely upon a. road sub-grade I with ' the double dowel bars of ‘each of the load trans 7.0 'mission units projecting‘through the opening 5 of the ñller board 4 and with the base flanges 1 of the plate lG'resting upon the sub-grade and secured in position by means of retaining stakes I1 which project through openings in the base flanges 1 andare driven into the sub-grade I -on diagonally opposite sides of the double dowel bars and onopposite sides of the filler board, as clearly 75 illustrated in Figure 1. _ structed the same as those illustrated in Figure 2 and have the ends thereof projecting in opposite 50 directions in overlapping engagement with re spect to one another to span the space between the angleplates I8 so that the ends of the dowel bars slidably project into the chambers 24 pro videdin the housings I9.` _ It will, of course, be understood that numerous details of construction may be varied through a wide range without departing from the principles .of this invention, and it is, therefore, not the purpose to limit the patent granted hereon other 00' wise than necessitated by the scope of the ap pended claims. I claim as my invention: - . 1. In an expansion joint for embedding be tween adjacent concrete roa'd slabs, a preformed 65 plastic iiller board mounted between the road slabs and having openings therein, load trans mission dowel bars arranged in reverse super imposed slidable contact- with one another and.y projecting through the openings in said _filler board, and housing ineans rigidly secured to each of the dowel bars and embedded in the concrete on opposite sides of the filler board for slidably receiving an end of the other dowel bar. 2. An expansion joint forming mechanism in 76 3 2,121,808 cluding in combination, a preformed compressible filler board having openings therein at spaced in tervals, a plurality of pairs of load -transmission cluding in combination a load transmission unit " the filler board, each pair of said dowel bars being arranged in reverse superimposed slidable contact with one another, apertured angle plates posi- housings and projecting through the respective comprising a pair of spaced apertured angle plates, a housing secured on each of said angle dowel bars ,projecting through the openings in ~ plates and a dowel bar secured to 'each of said angle plate on which the housing to which it is secured is engaged, said dowel bars being re tioned on opposite sides of the ñller board, means versed with respect to one another and slidably for securing the apertured angle plates in posi- ‘ contacting one another to bridge the space be tion, and housings secured to the outer sides of tween said angle plates. said angle plates with one of said housings se 6. An expansion joint forming mechanism in cured to each of said dowel bars and slidably re cluding in combination a load transmitting unit ceiving one end of another dowel bar. comprising a pair of reversed apertured angle 3. A road expansion joint comprising a pre plates, a housing secured to each of said angle 15 formed ñller board having spaced openings there plates, a ñange on each of said housings, and a in, apertured metal plates on` opposite sides of the filler board adjacent the openings, apertured base flanges on said plates for supporting the plates in position upon a road sub-grade, housings se 20 cured to said plates over the openings therein, load transmission dowel bar projecting through each plate and housing and rigidly secured to the respective housingñange, said dowel bars project, ing in opposite directions in slidable contact with and superimposed contacting loadv transmission dowel bars projecting through said plates and through the filler board, each of said dowel bars secured to one of said housings and slidably pro 25 jecting into an adjacent housing. . , ` 4. An expansion joint forming mechanism in cluding in combination a load transmission unit comprising a pair of spaced plates, a housing rig idly< secured on the outer face of each of said 30 plates, a dowel bar secured to each of said hous ings and having the inner en_d thereof projecting through the space .between saidrplates and into 35 an opposite housing in slidable contact with the adjacent dowel bar, and anchoring means formed on the outer ends of said dowel bars. . l 5.*An expansion joint forming mechanism in one another to span the space between the angle plates. ' 7. In an expansion joint for embedding be tween adjacent concrete road slabs, a preformed plastic filler board mounted between the road slabs and having openings therein, housing mem 25 bers on opposite sides of the filler board adjacent the openings therein and embedded in said road slabs, and pairs of reverse superimposed load transmission dowel bars embedded in the concrete slabs and projecting through the openings in the 30 filler board, each of said dowel bars being se cured to one of the housings and slidably pro jecting through the filler board into a housing on the opposite side of the joint. i ROBERT R. ROBERTSON.