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Патент USA US2123239

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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.
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