Патент USA US2123239код для вставки
Juiy 12, 1938. ‘ H. G‘RIVFFEL ' 2,123,239 REINFORCING MEMBER FOR REINFORCED CONCRETE STRUCTURES ’ Filed‘ April 27, 195:5v ms PM 1111712171938 UNITED STATES rA'rsu'rormcs 2.123.239 nummnomo mm FOR REINFORCED‘ CONCRETE 8W8‘ ‘Henry! Grllcl, mike, Poland Application can :1, ‘1m, sci-n1 in." 16,499 , In PM October :1. 1935 ll Chimi- ‘(CL ‘32-111) Applications have been tiled‘. in Polcno on In order‘ that the tenacity of the new reinforc— Uctober 21, 1935 and December '14, 1935 nnri. in Germany on November ill, 1M5 and December lug members may not he smeliecthagn that of 16, 1935. ‘ ' I - ' normal circular rods, according to the invention, all sharp edges of the respective cross-sections V may be considerably rounded. Finally the cross sections of the novel reinforcing members are in appearance so different from the circular cross-_ sections of the normal reinforcing members that‘ thenr can be distinguished from the letter nt o. glance. Consequently, erroneous use of the 10 This invention relates to on improved, rein - forcing member for reinforced concrete struc tures. . ' Steel reinforcing members are already lrnown - ‘which have other than circuisr cross sections coil to the uimensions of which. compared with circulur reinforcing members, are smaller the urcoteris /cieo.rer reinforcing members with high strength values instead oi the normal circular reinforce ments is safely avoideu. The new reinforcing members can also be provided with transverse ribs for the purpose of producing still greater to tenacity or adhesion with respect to the concrete. the allowable tensile stress in relation to the tensile stress of the round cross section ol normel strength; None of the moon cross sections oi l g steel reinforcements can,- however, be'enchsncco . for n de?nite corresponding clrculcr reinforce ment without further» colculstlons or slterution For this purpose also the‘ rod, can he twisted. oi nlsn, us such on erchunee will only be noonhle around its loneitudinsl sins; tor the purpose of producing the nccessurr tenscity, than in the cone oi the corresnonuinc forcing members are not, lilre‘the “lsteg” rode. ‘practicable only with larger cross-sections, but 2st ' The present invention hw l’or its oh-icct the‘ nrooluction of cross sections of reinforcing hers consisting of high value steel oi high yield point which oreof other then circolnr torm one which 30 .sre enchongeshle for corresponding nehnite cir culur nietol bars of normel strencth without our lurther. msninuletion such so colculotion or - ‘ ‘ advantages in comparison with the lrnown steel reiniorcements consisting of two mschinesturnecl circulor rods (“Isteg" system): The new rein ence of the cross section is as lsree or», or learner, olterotion oi oion. , i'orclnc’ members exhibit essentially the following , sllowolole stress smoller, but olso the clrcuniters cireulnr reinforcement. ‘ Finally, it must be stressed that the new rein ‘ turner the condition thotnot only is the cross Elli sectionol dimension in relotion to the lncrcuserl * According to this invention, 1 nrovioe onen circulsr reinforcing member tor rclniorcecl con; crete structures made oi high rnlue steel oi high rielel point hsving a cross section which is ueriverl trom the cross section oi n circle which corre sn'onds to the cross section‘ of o. normal circulur ill iron reinforcement and wmch is produced by re they can have the smallest CPOESTSEEUUD; their con, on account of the lack of a, special thermal _ treatment, be connected together by welding. and ?nally there is with them no danger cl 8. seporotion of the concrete under great loecls, us is 3% octue-llr the case with the “lsteg" rods. in the accompanying drawing is shown, by way of example, in Figures 1-6, embodiments of steel reinforcing members formed with s. cross-section in accordance with the invention, together with the pertaining normal steel reinforcing .rnemhers . of circular cross section. in the ?gures r:the radius of the convert curve one‘. 11 the radius of the COIlCEtVG curve oi the moving two opposite lens-like segments ol the periphery of the reinforcement, clzdisrneter oi the chosen circular cross-section and s=the circle by arcs of the some rouius us, or sinsller chord of the ore. ruoiius then, that oi the circle such thnt the ores, , , Reierring to the drawing, Figure 1 shows or steel reinforcing member with Ka=llltlil loci/cin-l ' _ of this cross section is smelter in the neutron pro portion to the area, oi the whole circle, but its huvine two convex faces 0:, :r snci two concurs tit plan; for the corresponding circular reinlorcine foces o‘, w. The member is distinguished by the simplicity of manufacture by means of rollers null in use by the shape simplifying howling one stocking. It will be seen that the greotest disin etcr c of the member corresponds eitoctir with. the diameter cl of the normal circular reinforce» member. ments having Kz=l2tll lrgJcm? The periphery - periphery is at least count to or erester then the ‘periphery of this circle. whereby a reinlorclnc member oriented for higher allowable stresses is urorluccol which is exchaneeehle directly, that is without any further calculation or ulterntlon oi . . ' ‘The radius of the concove lcccs may. it desired, he the some as the radius oi the compendium 55 circular reinforcing member. of the member, moreover, is the some or the cir-l cumference of the circular member hut the creel is, of course, 1w. The distance i or the concave 2 2,123,239 facesis equal to the distance h so that n=r. The cross-section according to Figure 2 differs from that according to ‘Figure 1 principally only by the rounding ofv the edges of the radius 11. In Figure 1 h=0.138'7 d and the angle c=87° 14'. In Figure 2 n=0.37 d, rz=0.065 d, h=0.1255 d, s=0.6626 d, b=0.0974 d, a=0.7064 d, the angle a=83° and the angle 19:97". In all cases the ‘sizes of the cross-sections formed according to the invention relative to the permissible tensile strain Kz correspond to, the pertaining circular cross-sections illustrated; the peripheries are at least equal to the circumfer ence of the respective .circular cross-section, which is advantageous‘ from the point of ‘view of tenacity. In cases where a particularly great tenacity or of said circle, whereby a reinforcing member adapted for high allowable stresses is produced which is exchangeable directly, that is without any further calculation or alteration of plan, for the corresponding circular reinforcing member. 2. A reinforcing member-for reinforced con crete structures made of high value steel of high yield point having an approximate circular cross section with two opposite portions thereof of con cave shape formed by removing two opposite lens-like segments of the same radius as that of the circular section, the junction of adjacent sur faces being rounded, the periphery of the said cross section being at least equal to the periph ery of said circle, whereby a-reinforcing member 16 adapted for high allowable stresses is produced which is exchangeable directly, that is without adhesion is desired between the reinforcing mem , any further calculation or alteration of plan, for ber and the concrete surrounding it, the mem the corresponding circular reinforcing member. bers, formed according to the invention, can be 3. A reinforcing member for reinforced con 20 made with transverse ribs projecting from the crete structures made of high value steel of high cross-section and lying against the concrete. yield point having an approximate circular cross One embodiment of such a ribbed rod is ‘shown in Figures 3 and 4. The cross-sectional form in Figure 3 corresponds to that in Figure 2. Be tween the cross section projections are arranged ribs k; the spacing can be chosen dependent on the diameter d, amounting in many cases to 1.5 d to 2 d. The size of the ribs k can be variously 30 chosen. Obviously the invention is not limited to the form of rib shown in Figures 3 and 4. Again, if a considerable tenacity is desired, the steel reinforcing members can be twisted about their longitudinal axis. Such a twisted rein 35 forcing member is illustrated in Figures 5 and 6, Fig. 5 being a cross-section on the line A-A of Figure 6 and Fig. -6 being a side elevation of the reinforcing member.‘ Such a twisting of the steel reinforcing member produces a considerable in crease in the tenacity of the upper surface of the reinforcing member. I claim: 1 - . 1. A reinforcing member for reinforced con crete structures made of high value steel of high yield point having an approximate circular cross section with two opposite portions thereof of concave shape formed by removing two opposite lens-like segments of the same radius as that of the circular section, the periphery of the said cross section being at least equal to the periphery section with two opposite portions thereof of con cave shape formed by removing , two opposite lens-like segments of the same radius as that of 25 the circular section, the periphery of the said cross section being at least equal to the periphery of said circle and said member being twisted around its axis, whereby a reinforcing member adapted for high allowable stresses is. produced which is exchangeable directly, that is without any further calculation or alteration of plan, for the corresponding circular reinforcing member. 4. ‘A reinforcement for reinforced concrete structures comprising a reinforcing member 35 made of high value steel of high yield point, said member having an approximate circular cross section with two opposite portions thereof of con cave shape formed .by removing two opposite lens-like segments of the same radius as that of the circular section, the periphery of the said cross section being at least equal to the periphery of said circle and spaced transverse ribs on said concave portions, whereby a reinforcing member adapted for high allowable stresses is produced which is exchangeable directly, that is without any further calculation or alteration of plan, for the corresponding circular reinforcing member. HENRYK GRII'T'EL.