" J2 22252112 22 J2 . 10a. a _o 15a E@ 24. I 45 INVENTJOR Ml, MIM# ’ ATTORNEYS Y Patented paesi,- 1946l ` 2,413,562 «UNniet»v STATES 'PATENT ’OFFICE 2,413,562 YPRncAs'r CONCRETE Mamans Albert Henderson', Edgewood, Pa. , assignor to William P. Witherow, y Pittsburgh, Pa. applicati@ september 1o, 1945, serial'No. 615,265 ' 11 Claims. This invention relates to precast building mem bers kcomposed of> concrete Vhaving reinforcing' 2 bersdisposed adjacent each other.- - 'f Y rods. ~ -part of my applica -tion, Serial No. 593,220, iiled May '11, 1945. The Y A f tionv whilel pouring concrete. y I preferably em ploy pipe v'of a- convenient size,> such as 11/2 A y tion, Serial No. 480,620, filed March 26,1943-, for Precast concrete buildingzconnectionsïwhich 'is a ”, for embedding in the members to' y provide> the necessary connections, The pipey ` ` continuation-impart y of „ my ~ prior applications, Serial No.4 432,209, -filed February 25, 1942, for Precast concrete buil ding, and Serial No. 313,067, Y filed January 9, 1940.»for Concrete building. Precastconcrete building members of various lengths'are preferably positionedin the mem bers so that theircenters are substantially 21/2" from the nearest surface of thev me mber, thus]A providing an adequatev thickness ofv concrete to ' typeshave been propose d Vheretofore but, so far protect the pipe lengths from ñre an d corrosion. I have invented'a novel type of concrete mem-A as I am aware. vno sa'tisfa madeffor rigidly and pe rmanently Y securing ad " ctory’provision infa building structure. has been jacent members together is probablythe rea Y also afford means to positionA the'rods accurately in »the'forms‘and main tain them rigidly in posi- 'A latter is _in part a continuation of my applica 20 » son forthe'relatively Vlimited use of precast struc - The pipe lengths to which the rods are welded This is a continuation-in l The lack of such connections ‘ y nd thus have -arg1 allowable shear stress several times that of m embers With out anchorage of th e longitudinal reinforcing rods or bars em-bedded therein and, in particular, Y to means for connecting ’a plurality of such mem ' - ' of the above groupings a ber having -`means adapted to form' a simple yet.l permanent and rigid `tie between one member and the »member or members adjacent thereto. 'Y ' _. In? a preferred embo tural members heretofore. » ,'_I'o meet J this require ment, IV embed >:lengths of metal-«pipe in certainv of thek members such -as girders, beams, joists, and thelike. The pipe .l engths are welded Vto ` diment, I provide a -precast concrete member withlongitudi nalV reinforcing , rods or bars and, adjacent the en ds _of the' mem ber, I embed pipe lengths therein between the '¿ . Abarsandjvweld them thereto.- ` The ' bores of the4 reinforcing rods embedded in the-members, thus- ‘Í pipe lengths are adapted/to imparting the necessary rigidity to the, connec receive tie means such as a bolt or dowel extendingY from an adja tions. The pipe lengths may also have relatively short metal anchor rodsv welded thereto for em cent member. The reinforcing' bar bedding >in the members, ¿extending parallel to lthe longitudinal reinforci v ng rods . therein. y By thus ¿welding the reinforcing rods and anchor 30 l yond the vrembedded pipe lengths'a s'ext'end be- - closely adjacent 'the' extreme ends of the con crete members. This concrete ad from prevents breakingthe out nd ,under terminate the . jacent the ' ends „ rods to the pipelengths, instead of relying onV ' to'which the members are subjected when some otherv form of tie, su ch as looping the rods ’ ~ stress assembled in a Y building. 'I'he barsand pipe> around'the'fpipe lengths, Iobtain an'extremely lengths, being welded together, constitute a rigid rigid `bond between the pipe‘lengths and the con crete and avoid any danger of Vcrackingof the concreteV adjacent fthe pipe lengths which would _ result in breaking the bond therebetween.- frame or» truss which is eii’ective to transmit the ' ` vention will becomel apparent d the follow ing complete description which uring refers to the ac- ' companying drawing. In the d rawing, Figure lis a transverse section through a pair i of members on eachprecastreinforced side thereof and concrete secured4 _ l splice plates having glînstitute, Detroit, Michigan, 1941> yas v-fcl- " - _ Y „ ` .1. Beams with no web reinforcement ,l thereto; Per cent` . Figure. 2’is a sectionft aken and > andwithout special anchorageof longi line YI‘I-II of Figure 1; tudinal.steel_______1____`- ________ __V_¿__k_„ . 2 2. Beams with no web reinforcement but with f vspecial anchorage of longitudinal steel-- 3. VBeams. with properly designed webreinVorcement but Vwithout special anchor < Y A 'along' the planeV of , " Figures 3 and 4 yare views -si »_ 3 , ag‘e of longitudinal steel__._`._ _________ _- and 2 showing members andmilar'to splice plates Figures_oif'v>` 1 f* larger size; Figure 5 is a vertical section through a'col'umn` 6Y , 4. Beams with properly designed4 web r'einforcement. and with special anchorage> . -, of longitudinal ‘steelr_____ __--_'_"_ ____ __ member throu gh» the reinforcing ¿ v, A rectangular piails l and novel v features of the _ in @Further det the ultimate compressive strength (Building Reg-ulations for Reinforced Concrete, American Con crete lows: one `thereof to a supporting member. u In some cases Des and ties may be used. 'The importance’of this feature i's‘readily ob served from the'table of allowable" stresses in'concrete under shear in terms of percentages of y load on A55 and .the ends of ka pairfof' girde'rs Vsupported » v thereon; . . n Figureö isy a partial section taken 12 along `the ‘y A plane of line VI'-VI of Figure 5; Figure 7 is a view simil ar toV Figure 6 showing Members. lembodying my invention _are in „the“ last, 60,41' slightly modiñed splice plate: andV u , ` 2,418,562 30 have cross ties welded thereto a intervals simi lar to the ties I3 and Isa. The girders 24 differ from the members I0 and Figure 8 is a partial plan view of a modified form of member. Referring now in detail to the drawing, and, Ina in that the ends thereoLare notched as at 3| for the present, to Figures 1 andl 2, a precast and the -ends ofthe upper reinforcing bars 32 member I0 of anysuitable length has upper and lower longitudinal bars II and I2 embedded therein in pairs, one pair being adjacent each-4 side of the member. Stirrups or cross ties I3 ’ the members and thus project somewhat beyond the wall of the notch 3|. The abuttingbars 32 extend around the bars at. intervals and are welded to them. Pipe lengths I4 are embedded in the member I0 adjacent the ends. «As shown the recess formed by the notches JI .. The lower are substantially flush with the extreme ends of - of adjacent girders rare welded as shown> at 33, access for the welding means being afforded by 32a are similar to the bars I2 bars in Figure 2, the pipe lengths are transverse to » - reinforcing of the members I0 and _Illa and also may be the bars and are welded thereto. The bars are welded at their ends as bars 32 are welded. A straight throughout their length and the ends ~ lfurther feature 'of the members 24 is the provi extend beyond the pipe lengths I4 .to within a 15 _ sionA of anchor lbars> $4 welded to the pipe lengths short distance _ofthe extreme ends of the mem bers I0, thus adequately reinforcing the concrete -at the ends of the member beyond the pipe I4 extending inwardly therefrom> and embedded _ lin the concrete.V - " v Figure 6 further‘showsthe arrangement ofthe girders on the column. ' Speciilcallmit shows a Splice plates I5 are >disposed on opposite sides 20 12"- wide girder ,24,resting Von an 8" wide col of a pair of the members I0 arranged end to end. ` The splice plates may be of _any suitable length. _ Figure 7 is similar to Figure 6 showings. 16" lengths. ' ' If the members I0 are 8" x 8", the splice plates wide girder l1 ‘resting on a 12" wide column $8. are preferably 4" wide and 8” deep. The splice The girder has lower reinforcing bars 39 arranged _plates have upper and lower longitudinal rein-v 25 in pairs„one bar ofv each pair extending on each "forcing bars I6 andI'I and pipe lengths I8 em-. side of each _of the pipe'v lengths I4 being welded _ bedded near the ends hereof,~the pipe lengths extending transversely of the bars and welded Figure 8 showsa modifiedform of member 40 thereto. _The splice plates also have _Stirrups or having longitudinal reinforcing bars 4I *andßpipe cross ties I9 welded to the bars. As inthe case lengths 42 Vembedded therein and welded together. »of the'members I0, the bars I1 >extendbeyond . The bars are disposed on theouter side only of the pipe lengths I8. The center-to-center spac the pipe` lengths., are straight throughout their ing of the pipe lengths I8 is such thatwhen the entire length, and extend beyond the pipe lengths lengths I4 of_ Va pair‘of members I0 disposed . to points closely adjacentthe extreme ends-of Pipe _ 35 end-to-end are in alinement therewith the ends the members. f Stirrups“l extend aroundthebars ofthe members are in substantial abutment. . 4I and `arejweldedtheretop There are several When the members to be connected end-to-end pairs of pipe lengths at each .end of vvthe member ~ thereto. ` have been assembled with the splice plates as shown in Figures 1 and 2, tie members such as rivets or bolts 2| may be inserted through> the ' as shown in Figure 8.' Stirrups 44 extendearoundv` a the pipe1 lengths of 'each pair and yare welded thereto. It will be apparent that the invention 4provides ' alined pipe lengths i4 and I8 to secure the splice plates and members firmly together. Figures 3 `and 4 show members -Illa and splicey plates IEa generally- similar to those already de ' precastv concrete members having means, where by adjacent members ina construction may be easily _yet permanently united. The reinforcing scribed except that each member has intermedi ate reinforcing bars 22 in addition to the upper bars I I and lower bars I2. The splice plates also ` bars, beingl welded vto the pipe lengths _ >through _ which the tie means pass, transmit '..they load applied to one member directlyy to the members have intermediate bars 23. Stirrups or cross ties connected thereto. The ends of the bars project-` I9a extend around the bars I6, I'I and 23. The ing beyond the pipe lengths prevent breakage of ' pipe lengths I4a in the mem-bers Ilia are disposed 50 the concrete at the extreme ends of , _the mem transversely of thebars and between adjacent pairs. The pipe lengths and the splice plates are similarly disposed, there being two pipe lengths in each end of each member Illa and in each end of each splice plates. bers. The, connecting vmeans is. equally simple and effective in the case of splice plates for ’ uniting membersabutting end-to-end as-in the v case of the column and girder combination in Stirrups or cross ties Ha which the ends> of the two alined girders rest on extend around the bars 'l I, I2and 22. When the a single column. may be permanently secured by rivets or bols 2Ia or tie bars may' be inserted through» _the pipe lengths and welded thereto at their ends. _ recognized that changes in y the constructions dis 60 Figure 5 illustrates a column- 23' supporting the ends of a pair of girders 24 which are generally ` - Although I have illustrated and described but a. fewy mod_iñcations of _ _the invention, `it will'be members and splice plates arerassembled they ~ closed may be made `without de'parting from the ' spirit of the invention or the scope of the ap pended claims. similar to the 'members III- andIßa. The column ' ‘ _ _ _ Y 1. In a >building' -construction a `plurality of f has an integral base 25 rested on afield-east foot ing 26 with a layer of grout therebetween. Anchor bolts 21 embedded in the footing project upwardly precast reinforced concrete' members, -said mem through holes in the base 25 formed by pipe “1 tudinal reinforcing bar ïembeddedtherein' land bers including‘a member having a tie _extending therefrom and _a second member having a longi lengths embedded herein and welded to Stirrups having a metalmember‘closely adjacent an end of said second member transversely disposed ‘ad jacent a side pi' said bar and being _welded to ' 29. The column has~longitudinal reinforcing bars _30 projecting above theupper end thereof and partially >through the pipe lengths I4 embedded» in the members 24. The ends of bars 30 may be` welded to pipes I4. I mayñll the space between 1 it, said metal member having a lbore receiving bars 3D and pipe lengths I4 with grout. The bars 75 said tie, said second memberhaving another spaced, longitudinal reinforcing barwelded to - 5 ' 2,413,562 said metal member, one of said bars extending beyond said metal member and being welded to a similar bar of another member in an axial position with respect to said secdnd member. 2. A building construction comprising a plu rality of precast reinforced concrete members, _ said members including a member having a tie means extending therefrom and a second mem 6 bond of the concrete of said second member to said bars. 7. A building construction comprising a plu-rality oi’ precast reinforced concrete members, said members including a first member having spaced tie means extending therefrom and a sec ond member in abutting engagement therewith having embedded in the concrete thereof a metal frame composed of three spaced-apart, longi ber having embedded in the concrete thereof a frame comprising two spaced, longitudinally ex 10 tudinally extending, reinforcing bars, said bars tending, primary reinforcing bars, said bars be being equally- spaced from a side of said second ing straight for their entire length and haveY member and including outer bars and an inner ing closely adjacent an end transversely dis bar, and two metal members each having a bore posed between them a metalmember, the ends of therein disposed transversely between said bars said bars projecting in a straight line beyond closely adjacent an end thereof, said two metal said metal member and terminating in proxim members receiving said tie means" and being ity to the end of said second member, said metal welded to said inner bar and each metal member member being welded to said two bars and hav being welded to one of said outer bars, each ing a bore therein receiving said tie means ex metal member being spaced the same distance tending from said first-mentioned member. 20 from one end of said second member, thereby 3. A building construction comprising a plu tying the three bars together and preventing rality of precast reinforced concrete members, lateral movement thereof when said tie means said members including a member having tie exerts a force parallel to said bars in either di means extending therefrom and a second mem rection therealong. ber having embedded therein a frame compris 8. A precast reinforced concrete structural ing two straight, spaced, longitudinally .extend unit comprising an elongated mass of concrete ing, reinforcing bars, a pair of transversely ex having embedded therein a metal frame includ tending metal members disposed between said ing two spaced-apart, longitudinally extending, bars closely adjacent one end of said secondmem ber, said bars extending beyond said metal mem 30 reinforcing bars, and a metal member having a bore therein being transversely disposed between bers and terminating in proximity to the end of said bars closely adjacent an end of each bar, said second member, each metal member being said metal memb r being welded to at least one welded to one of said bars and each having a bore of said bars. ‘ therein receiving said tie means extending from 9. A precast reinforced concrete structural said first-mentioned member. ' f 35 unit comprising an elongated mass of concrete 4. A building construction comprising a plu-_ having embedded therein a metal frame including rality of precast reinforced concrete members, said members including a member having a tie means extending therefrom and a second member three spaced-apart, longitudinally extending, re reinforcing bars and a metal member having a spaced from a side of said unit and including outer bars and an inner bar, said two metal mem inforcing bars and two metal members each hav in abutting engagement therewith having em-' 40 ing a bore therein, said metal members being transversely disposed between said bars closely bedded in the concrete thereof a frame includ adjacent an end thereof, said bars being equally ing two spaced apart, longitudinally extending, bore therein disposed transversely between said bars closely adjacent an end of said second mem ber and welded to said bars, the extreme ends of said bars projecting beyond the metal mem-I ber, said metal member receiving said tie means. 5. A building construction as deñned byclaim 4 characterized by the portion of said bars pro bers being equally spaced from one end of said 45 unit and each metal member being welded to one of the outer bars and to the inner bar. 10. A building construction comprising a plu’ rality of precast reinforced concrete members, said members including a first member having a Jecting beyond the metal memberhaving cross 50 tie means extending therefrom and a second j member in abutting engagement therewith hav bars welded thereto, thereby reinforcing the ex ing a compression area and a tension area, two treme end portion of said second member. spaced, longitudinal, reinforcing bars being em 6. A building construction comprising a plu rality of precast reinforced concrete members, 55. bedded in thetension area of said second mem ber, a metal anchor having a bore therein being said members including a iirst member having a tie means extending therefrom and a second , l member in abutting engagement with said ñrst member> and having embedded in the concrete thereof a metal frame composed of two spaced apart, longitudinally extending, reinforcing barsA bonded to said concrete, and a metal member having a bore therein disposed transversely be tween said bars closely adjacent an end thereof and welded to said bars, said metal member receiving said tie means, said tie means serving to transmit from said iirst member a force acting on said metal member parallel to the longitudinal embedded in the tension area and in the com pression Aarea of said second member, said anchor being disposed transversely to said two bars and welded thereto and being positioned adjacent an 60 end of each of said bars, said tie means in said first member extending into said bore in said anchor. 4 11. A precast concrete structural unit compris ing an elongated mass of concrete having a com pression area and a tension area, two spaced, lon gitudinal, reinforcing bars being embedded in the tension area of said unit, a metal anchor having a bore therein being embedded in the unit and axis of said second member, and in either direc extending into the tension area and the com tion therealcng, the bearing of said meta] mem ber on the concrete of said second member being 70 pression area adjacent an end of said unit, said anchor being disposed transversely to and being shared between said bars by virtue of the weld welded to an end of each bar. . ' ing of said metal member to said bars and the ALBERT HENDERSON.