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Патент USA US2137009

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Nov. 15, 1938.
J, A. STRQMBERG
2,137,009
CONCRETE STRUCTURE
Filed NOV. 27, 1956
5 Sheets-Shea?I 1
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Nov. 15, 1938.
J4 A. STROMBERG
CONCRETE STRUCTURE
Filed NOV. 27, 1936
2,137,009
Nov. 15, 1938.
J. A. sTRoMBERG
2,137,009
CONCRETE STRUCTURE
Filed Nov. 27, 1936
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35W MW
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3 Sheets-Sheet 3
2,137,909
Patented Nov. 15, 1938
UN1TED sTATEs PATENT OFFICE
‘2,131,009
'
coNcnE'rn STRUCTURE'
John A. Stromberg, Des Plaines, lll., assignor of
one-half to Volcanic Products Corporation,
Chicago, Ill., a corporation of Iliinois
application November zu, ma, serial No. naait
9 claims. (ci. '1a-_lun`
in providing spaced slabs with battered and cor
This invention relates generally to improve
rugated sides which features together with a
ments in concrete'structures and has particular
poured bonding element, poured therebetween,
reference to light-¿weight concrete floor structures
resist the tendency of the slabs to lift in the
bending of the joist and also aüord an increase 5
in the moment of inertia in the design.
Myinvention contemplates also a novel floor
embodying a novel and economical design par
5 ticularly adaptable to use in residences, apart
ments and other buildings. '
An object of my invention is to provide a ilre
system wherein the precast slabs and precast
joists and the poured interlocking bonding ele
ments are‘interconnected together by extended l0
reinforcing members.
More specifically stated, an important feature
resistant and structurally adequate door con
struction with the least volume, weight and cost
i0 of material, and at a minimum expense of labor;
such hoor construction including the novel use,
construction and adaptation of precast members
affording efilcient methods of manufacture and
erection thereof. To meet these basic require
of my invention resides in the provision of a
floor system having precast joists and precast
slabs and a.V poured interlocking bonding element 15
.of precast joists and floor slabs. The floor slabs , wherein for example:
l5 ments I provide a novel system or combination
' 4(a) The Joist has a stem or web of minimum
being preferably precast.
cross-sectional _thickness with a slightly widened
Another important feature oi my invention
lower flange and an upper flange slightly wider
resides in the novel design of the bonding, inter
20 locking and reinforcing details whereby the slabs
and joists act integrally or in the manner of a
T-section.
than the lower ñange.
_
Another object of my invention is to produce a
tion such as floors for dwellings, the lower flange
may 'carry` one or preferably two longitudinally 25
more perfect and eilicient T-beam action between '
25 the floor slab and joist, that is, to produce a
extending reinforcing (tension) bars and the
strong and‘rigid joint between the slab and joist
sections aiîording a continuous slab.
v
The lower and upper 20
flanges being reinforced respectively with tension
and compression reinforcing members extending
longitudinally of the beam. For light construc
upper ilange a pair of spaced longitudinally ex
-
tending‘reinforcing (compression) bars tied to
gether with suitably spaced light cross bars. The
vertical“ shear reinforcing Aconsists, of suitably 30
In a floor system of the T-section design, the
bonding and interlocking element or joint be,
30 tween the >slab and the joist is stressed con
spaceclflightr weight stirrups extending vertically
intensity for different `design loads and spans.' through: the beam web and having ends looped
siderably by shear which obviously varies in unit
aroundthe; tension reinforcing. bars in the lower
The ultimate shear resistance of such bonding
and interlocking element between the slab and -f "
flange-arid .intermediate portions or ends extend
35 joist should provide an adequate safety factor "ingaboveïthe top of the beam fadapted to be 35
and should be capable of developing the „yield
point strength of the joist reinforcemenhÍ
' ,around
` looped
- .
the reinforcing bar in the poured
ì dink? element. g
.l
-
,
The primary object of this invention is'thére->-._ì" ib) `:The'precast‘slabs are formed with down
fore directed to the solution of the prcpblerrllof*` ."»Watdlyiputwardly battered opposite sides4 and
40 the bonding joint between the slabs andy-joists ` thebatteredl’isides' are corrugated. The corruga- 40
and to produce a very eñlcient designjet. vfloor v>tionsiextend»transversely of the slab. Each slab
` A'ded with suitable spaced reinforcing bars
construction wherein the joist. and slab zfunc-`
tion together as a T-section; the design per
which xtend outwardly ci or beyond the corru
mitting slight variations from exact joistspacing y
45 by the use of spaced slabs and still affording conf.v
tinuity and stability of the finished floor slab
"
_ab-l faces. The ends of these bars are
, hooked.v vThe extended portions of these
5
efin' overlapping arrangement over the
Another feature of my invention resides’l'inflihe ` l 5015*' “dare-adapted to be embedded Within the
system.
'
H
ï
‘
provision of reinforcing members in the'` slabs
50 and joists which reinforcing membersA 'are
pouredï'interlocking bonding section to thereby
tie-or interconnect the slabs together through 50
the bonding vjointv element.
adapted to extend into a poured or cast-in-place
The poured` interlocking or bonding element is
bonding element to thereby interlock such bond
also
preferably -'provided withga longitudinally
ing element with the adjacent slabs and sup-`
extending reinforcing b_ar around which I loop
porting inist.
I6 Still another object of my invention resides the outwardly projecting portions of the- vertical 65
stirrups of the beam, thus tieing together .the
precast floor slab;
It is also a feature of my invention to provide
precast concrete beams with a plurality of open
ings spaced longitudinally of the beam and ex
Fig. 14 is a longitudinal section of the precast
floor slab taken on line i4-i4 of Fig. 13;
tending through and within the middle one-thrid
of Fig. 13;
section of the beam length to thereby secure a
more effective section by directing and localizing
the compressive stresses in the compression sec
Fig. 16 is a plan view-of the precast beams '
showing the improved connections between a
cross beam or header and between a beam
framed into the header;
10
10 tion of the beam above such openings and thus
developing more of a truss action rather than
a beam action.
Another feature of my invention is found in
the utilization of such beam openings for pas
sages for pipe or conduits and the like.
_
Still another object of my invention resides in
the provision of a novel fire-resistant connection
for precast beam ends which is particularly
adaptable for use in framing headers or cross
beams into spaced floor beams around stair
wells; such connections including rigid steel sad
dles secured to the webs of the precast beams
and a mass of concrete extending over and
around such saddles to substantially cover such
25 steel saddles.
With the above and other objects in view, my
invention consists in the novel combination, con
struction and arrangement of the parts and
members shown in preferred embodiment in the
30
attached drawings, described in the following
specifications and particularly pointed out in the
appended claims.
In the drawings:
Fig. 1 is a sectional plan view showing a por
35 tion of a floor built in accordance with and em
bodying my invention;
Fig. 2 is a cross-section taken on line 2-2 of
Fig. 1;
Figs. 3, 4 and 5, illustrate typical joist sections
40 for dwellings embodying my novel beam design
adapted for maximum spans respectively 16 feet,
20 feet and 24 feet;
Fig. 6 shows a table giving the approximate
cross-sectional areas and weights of the 8, 10
45 and 12 inch joist sections shown in Figs. 3, 4
and 5;
Fig. 'l is a table showing the resisting mo
ments, steel reinforcing required, and shear val
ues for the three illustrated typical beam
50 sections;
Fig. 8 shows a typical cross-section of a floor,
a ceiling supported on the lower ends of the ioists
and manner of~ nmning electric wire conduits
through openings in the beam webs;
55
Fig. 13 shows a plan view of atypical concrete
beam with the bonding element.
Fig. 9 is a side elevation of a typical joist
showing spaced openings in the middle one-third
section thereof;
Fig. 10 is a modified cross-section of a floor
wherein the electric wire conduits are run in
the plane of spaced floor sleepers between the
top wood door and the concrete floor slabs;
Fig. 11 is an enlarged cross-section taken on
line ii-ii of Fig. 9 showing manner of sup
porting the ceiling channels to which suitable
wire mesh is secured for a plastered ceiling;
Fig. 12 is an enlarged cross-section in per
spective taken on line I2-I2 of Fig. 8 showing
an opening in the web of the beam, a corrugated
70 side of one of the door slabs and one of its re
inforcing cross-bars extended into the space
which is to receive _the poured bonding section,
and also showing the longitudinal reinforcing
bar for the bonding section engaged by a Dair
75 of the spaced beam stirrups;
‘
Fig. 15 is a cross-section taken on line i'l-il
Fig. 17 is a cross-section taken on line I1-i`l
of Fig. 16;
Fig. 18 is a view in perspective showing the
metallic saddle adapted to receive the end of a
beam.
In the concrete floor construction illustrated
in Figs. 1 and 2, the walls of a building are in
dicated by 2l and the improved precast beams
or Joists by 28. 'I‘he precast floor slabs are in
dicated by numeral 21.
The beam sections shown in Figs. 3, 4 and 5
are illustrative of precast floor Joists made in
accordance with my invention for use in struc
tures such as dwellings and are intended to sup
port precast iloor slabs such as shown for ex
ample in Figs. 13, 14 and 15.
In my system of floor construction, the beam
28 may be described'as the T-beam type or de
sign consisting of an upper flange 26^, a stem
or web 28B and preferably a lower flange or 30
widened section 280.
The lower section 26° which is under tensile
stress is preferably reinforced with two spaced
bars 2| extending longitudinally of the beam
and the upper section 26A which is under com
pression is also preferably reinforced with two
spaced bars 29 extendinglongitudinally of the
beam.
'I'he reinforcing bars 28 are tied by cross mem
bers of heavy wire 30 having ends wrapped or 40
looped around the bars 29.
Each beam 26 is reinforced with suitably
spaced stirrups 2i consisting of a single wire hav
ing an intermediate looped portion 3|^ extend
ing about the top of the beam and the ends of .
which extend through the stem or web 26B into
looped or wrapped engagement
sion bars 28 in section 28C.
Obviously the size of the wire
the spacing of same will vary
spacing of and load on the beam.
with the ten
stirrup 3i and
with the size, Í
In the typical
joist sections illustrated, these stirrups may be,
for example, No. 7 wire spaced approximately
six inches apart in the outer one-third sections
of the beam and twelve inch spacing may be
used in the middle one-third section.
I prefer to form the precast joists 26 with
spaced circular open sections 26D extending
through the web 26B. These openings 25D to be
within the middle one-third section of the beam 60
length, of a diameter not to exceed one-third of
the depth of the beam and spaced approximately
two to three times their diameter center to center.
The use of these openings not only effects a sav
ing of concrete but they form passages for pipe
or conduit 32 as illustrated in Fig. 9 and afford a
novel beam design of a comparatively effective
section wherein the compressive stresses are con
centrated or localized in the compression section
of the beam above such openings to develop more
of a truss action rather than a beam action.
Ob
viously, these openings might be of other form or
configuration as for instance, triangular openings
alternately reversedly disposed, that is, the apex
of one triangular opening to be pointed toward 75
aisancey
the upper flange of the beam and the apex of the
adjacent triangular opening to be pointed down
wardly toward the lower flange of the beam
The upper edge of these openings 26D to be
approximately at the meeting line of the face of
the web 26B with the angular face of the upper
. flange of the beam.
The precast concrete floor slab 21 as shown in
Figs. 13, 14 and 15 consists of a flat body of mini
10 mum thickness having spaced end and interme
diate c_ross ribs 21A each reinforced with a bar 33
which extends at both ends beyond the corru
gated sides 21° of the, slab and the ends of which
are preferably bent as shown in Fig. 12 for hooked
15 embedment within the bonding and interlocking
concrete element indicated by numeral 34 shown
in Figs. l and 2. The'longitudinally«extending
3 .
header 26W which includes a steel saddle com
prising an angle 45 bent U-shape and riveted to
a steel plate 48. V'I'he steel saddle is mounted on
the side face of the web of the cross-joist or
header 28W between the beveled face portion of
the upper flange and the lower flange thereof and
is secured to the Webby bolts 41 'which are
adapted to be embedded in the web.
It will be noted that in all of these connections
the steel saddle is encased with a block of con 10
crete extending on both sides `and bottom of the
U-shaped angle and outwardly to the edge of the
outstanding leg of the angle 45 so that the steel
saddle is surrounded by a protective casing of
concrete indicated by numeral 48.
15
'I'he joist which carries the saddle is cast in
each case with a recess 26Y in the upper’flange of
sides 21c are of increased cross-section 'and also ` the beam. This recess 26Y extends longitudinally
lof »the joist to points slightly beyond the inner
reinforced as with bar 35.
20
It will be noted that> the precast floor slabs 21j :faces of the parallel outstanding leg portions of 20
are substantially less in width than the spacing
of the precast ioists 26 and that they are sup
ported on the joists 26 a spaced distance apart
which not only facilitates their installation where
such joists might not be exactly spaced, but
which slab spacing primarily provides the desir
able space for the concrete which is poured at
the construction site to constitute the bonding
and interlocking element 34. This bonding and
30 interlocking element 34 is reinforced by a longi
tudinally extending bar 36 which is engaged
within the extended loop ends 3M of the joist
stirrups 3|.
It will now be readily apparent from the vari
35 ous illustrations that the poured element 34 con
stitutes a very important feature of my invention
since it interlocks the sides of the slabs with the
beams or joists. The reinforcing bar 36 of the
`poured element is connected by the stirrups 3i to
the beam 26 and the slabs 21 are interlocked with
40 the element 34 not only through the extended
hooked reinforcing bars 33 but through the cor
rugations in their sides and thus these corruga
tions resist the. lateral stresses in the upper flange
-of the composite T-beam section which includes
45 the upper portion of the joist 26, adjacent por
tions of the slabs 21 and the interlocking bonding
element 34.
.
Fig. 8 illustrates a side elevation of a typical
precast floor joist 26 showing the spaced openings
the >U--shaped angle 45 and inwardly to the face
of the web of the joist. This recess permits the
end ofthe joist which is to be supported on the
saddle to be lowered into the saddle.
It will be noted that the end of each joist, 25
which is to be supported in the saddlefis pro
vided with a recess 2BR to clear the encasing con
crete of the saddle and that this recess 2BR ex- ~
tends inwardly of the end of the joist and up
wardly through the lower flange into a portion 30
of the web of the joist at its plane of support in
the saddle.
.
It may bestated that the distance between the
inner faces of the parallel Vertical portions of
the outstanding leg of saddle angle is slightly 35
greater than the width or thickness of the web
of the joist to be supported therebetween.
I claim:
`
1. A reinforced precast concrete T-beam corn
prising a flange portion in the compression section 40
thereof, an integral depending stem portion, rein
forcing members in said flange portion and in the
tension section of said stem portion, and a plu
rality of spaced stirrups disposed vertically
through said beam, each of said stirrups having 45
an intermediate looped portion disposed above
the top of said flange portion and the ends thereof
looped about the reinforcing members in the ten
sion section of said stem.
2. A reinforced precast concrete T-beam com
50
50 26D in the middle one-third section of the length
prising a ilange portion in the compression sec- «
of the beam, and in Fig. 9 are shown conduits 32
extending through the joist openings 26D to an
outlet box 31 which is supported on the channels
38’which are provided with bent ends 38A hooked
55 for support on the lower flanges 26° of the joists.
As clearly shown in Fig. 11 the wire mesh 39
tion thereof, an integral depending stem portion,
a pair of spaced reinforcing members extending
longitudinally of said flange portion, a plurality
of spaced reinforcing cross-members having ends 55
connected to said flange reinforcing members, a
for the plaster ceiling 40 is secured to the spaced
pair of spaced reinforcing members extending
channels 38 by wired connections 4l. An electric
longitudinally of the beam in the tension section
of said stem portion, and a plurality of spaced
light fixture is indicated by 42.
In Fig. 10 the conduits 32 and the outlet box
stirrups disposed vertically through said beam,
31 are disposed in the plane of the spaced wood
sleepers 43 between the wood floor 44 and the top
of the precast slabs 21.
Figs. 16, 17 and 18 illustrate my improved fire
resistant connection for inter-framing of joists
with cross-joists as for instance, around floor
openings or stair wells. In these illustrations
26X indicates a pair of joists supporting a crosse
70 joist or header 26W into which is framed the in
termediate joist 262.
'
_
The fire-resistant connections for the ends of
the header 26W and the end of joist 26z are simi#
lar and it will therefore sumce to describe the
75 connection between the end of joist 26Z and
60
each of said stirrups having an intermediate
looped portion disposed above the top of sa'id
flange portion and each end thereof looped about
.one of said stem reinforcing members.
3. A precast concrete beam as embodied in 65
claim 2 wherein said stem includes a plurality
of spaced circular openings within the middle
one-third section of the length of the beam, said
openings being substantially of a diameter not
exceeding one-third of the depth of the beam and 70
being spaced substantially a distance of two to
three diameters center to center.
4. A reinforced concrete beam comprising an
upper flange portion in the compression section
thereof, a lower flange portion of comparatively - 75
4 ,
9,187,000
decreased cross-sectional width, a web formed in
tegrally with said flange portions of a cross-sec
tional width less than that of said lower flange, a
plurality oi' spaced reinforcing members extend
ing longitudinally of each of said flanges, a plu
rality of spaced reinforcing cross-members con
necting the reinforcing members in the upper
iiange, and a plurality of spaced stirrups disposed
vertically through said upper flange and web,
lo each of said stirrups having an intermediate
.looped portion extending above the top of said
beam and the ends thereof in looped engagement
with the reinforcing members in the lower flange,
said upper flange being formed with a pair of
15
longitudinally extending triangular sections cast
integrally with the upper flange and the web con
stituting a stiifening Junction for theseportions.
5. A reinforced precast concrete beam as em
bodied in claim 4. and including a plurality of
spaced openings extending through said web, said
openings being disposed within substantially the
middle one-third section of the length of the beam
to localize the compression stresses in the rein
!orcedconcrete section above said openings.
6. A reinforced precast concrete beam as em- l
bodied in claim 4, and including a plurality of
spaced circular openings extending through said
web. said circular openings being located within
substantially the middle one-third section of the
length of the beam and substantially of a diam
eter not exceeding one-third of the depth of the
beam and spaced substantially a distance of two
to three diameters center to center.
l7. A light weight concrete floor structure of
minimum weight comprising a plurality of spaced
reinforced precast concrete joists of T~beam sec
tion. a plurality of reinforced precast concrete
slabs of minimum cross-section «having spaced
cross-ribs with a reinforcing member in each of
said >cross-ribs extended at its ends beyond the
sidesof the slab, said slabs being arranged in
spaced rows.A for support on said joists in such
manner as to leave a channel therebetween over
the center of said joists and having downwardly
45 outwardly battered corrugated side faces defining
said channels, a pair of spaced longitudinal rein->
forcing members in the compression and tension
sections of each of said joists, a plurality of spaced
reinforcing stirrups extending vertically- of said
Joistsihaving intermediate looped portions ex
tended above the top of said Joists into said chan~
nels, a concrete bonding and interlocking element
poured into said channels flush with the top of
said slabs, and a reinforcing member extending
longitudinally within said poured concrete ele
ment and disposed within said looped portions of
said stirrups.
>
10
8. A concrete floor structure comprising a plu
rality of spaced reinforced precast concrete T
beam ioists, a plurality of reinforced precast
concrete slabs supported in spaced rows on the
flanges of said T-beam ,ioists so as to leave a chan 15
nel over the center of said joists between adjacent
sides of said slabs, transverse reinforcing mem-4
bers in said slabs having ends thereof extended
into said channels, spaced reinforcing stirrups
in said joists having looped portions extending 20
above said joists into said channels, a concrete
bonding and interlocking element poured into
said channels flush with vthe top of said slabs,
and a reinforcing member extending longitudi
nally within said poured concrete bonding ele 25,
ment disposed within said looped portions of said
stirrups whereby adJacent portions of said slabs
increase the effective compression flange section
of the joists, said slabs having corrugated sides
defining said channels for said poured concrete. 30
9. A comparatively light weight reinforced pre
cast concrete floor slab having a body with a
smooth level upper face. said body being of mini
mum cross-section with spaced end and inter
mediate integral cross-ribs formed on the lower 35
face of said body, said cross-ribs merging with
longitudinal ribs formed on the lower face of vthe
body at the sides of the slab and having down
wardly battered and transversely corrugated outer
faces, a reinforcing rod in each of said cross
ribs, and a reinforcing rod in each of said longi
tudinal side ribs, -said cross-rib, reinforcing rods
having ends extended beyond the corrugated side
faces and bent for interlocking engagement with
in a poured concrete bonding element between 45
spaced rows of such slabs.
y
JOHN A. S'I'ROMBERG.
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