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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.
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