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Патент USA US2110110

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March 1, 1938.
w. N. MURCH
2,110,110
REINFORCED CONCRETE FLOOR CONSTRUCTION
Filed March 26, 1956
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March 1., 1938.
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WNMURCH
2,110,110
REINFORCED CONCRETE FLOOR CONSTRUCTION
F‘iled March 26, 1956'
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Patented Mar. 1, 1938
ATET
FFlCE
2,110,110
REINFORCED CONCRETE FLOOR CON
STRUCTION
William N. Murch, University City, Mo., assignor
to Sinclair Construction Company, University
City, Mo., a corporation of Missouri
Application March 26, 1936, Serial No. 70,922
5 Claims. (Cl. 72—66)
My invention relates to reinforced concrete
?oors. Its principal object is to devise a rein
forced concrete ?oor construction which can be
made without using centering or temporary sup
ports. Another object is to devise a reinforced
concrete floor constructionthat will be light and
strong and economical of labor and material.
The invention consists in the arrangements and
combinations of parts hereinafter described and
10 claimed.
‘I hereinafter mentioned. The lower chords of the
trusses are wider than the lattice portion thereof
and their margins form ledges on which the
ends of hollow tiles 6 are supported. The lower
chords are wide enough to leave the proper space 5
for pouring concrete ribs above them and be
tween the ends of the tiles supported on opposite
sides thereof.
,
In a typical construction, the trusses are ar
ranged parallel with each other and are spaced 10
In the accompanying drawings, which form , apart by means of suitable spacing members 8
part of this speci?cation and wherein like refer
ence numerals refer to like parts wherever they
occur,
Fig. 1 is a top plan view of the metal trusses,
hollow tile and spacing members of a hollow ?oor
construction embodying my invention,
Fig.2 is a side elevation looking in the direc
tion of the arrows 2-2 in Fig. 1,
Fig. 3 is a sectional view on the line 3-3 in
Fig. 1,
Fig. 4 is a sectional view on the line 4-4 in
Fig. 1,
Fig. 5 is a sectional View on the ‘line 5-5 in
Fig. 4,
Fig. 6 is an elevation of a portion of one of the
spacer members,
'
Fig. 7 is a sectional view at one of the metal
truss members of Fig. 3 showing the poured
Fig. 8 is a sectional view similar to Fig. 4, show
ing the poured concrete,
Fig. 9 is a sectional view showing the inven
tion as applied to a metal beam or grider,
Fig. 10 is a sectional View of a modi?cation
in "which they metal trusses have their upper
chords resting on the tops of metal I-beams,
Fig.,1l is a partial sectional view similar to
Fig. '7, showing a nailing strip for a wood ?oor
40 applied to the upper chord of the metal truss,
.
Fig. 12 is a sectional view showing a modi?ed
form of tile.
According to the present invention, a series of
metal trusses I are supported at their ends on
walls 2 or girders. A truss suitable for the pres
ent construction consists of an I-beam slitted and
expanded so as to spread apart the top ?ange 3
and bottom ?ange 4 andstill leave them integral
1y connected by tie members 5. Such expanded
beams or girders are well known structural ele
ments.
main stretches of such spacing members to be
positioned with the upper surfaces of their mar
ginal portions substantially flush with the upper
surfaces of the marginal portions of the lower
chords of the trusses. Preferably, the spacing
{members are formed with upstanding flanges
It! for the purpose of stiffening them, said ?anges
being located inwardly from the sides thereof,
leaving the marginal portions to constitute ledges
for supporting the sides of the tiles 6. By this 25
arrangement, the spacing members function as
struts or distance pieces to keep adjacent trusses
spread apart, as tie members to keep said trusses
from spreading too far part, and as supporting
members for the adjacent tiles.
30 concrete in place,
and
such as are shown for example, in Fig. 6. The
spacing members there shown have recesses 9
in the underside adapted to receive the lower
chords of the trusses and thereby enable the 15
_
The trusses are strong and rigid enough to sup
port,‘ without de?ection, their own weight plus
the weight of the hollow tiles 6, and Wet concrete
Lil CH
' 30
In the construction illustrated, the hollow tiles
6 are supported on the lower chords of the
trusses, the individual tile being of such length as
to reach from truss to truss but short enough to
leave ample spaces between its end wall and the
end wall of the tile supported on the opposite
margins of the truss for the formation of a re
inforced concrete beam ll. Those tiles that are
next to the spacing members have one edge rest
ing on the ledges thereof, the tiles on opposite
sides of the spacing member being arranged suf
?ciently far enough apart to provide for the
formation of a concrete rib l2 extending from
truss to truss.
.,
Prefer-ably the hollow tiles are of less depth than
the distance between the upper and lower chords
of the trusses.
The spaces between ends of the '
tiles on opposite sides of the trusses and the
spaces above the spacing members are ?lled with
concrete vwhich is extended upwardly far enough
to embed the upper chords of the trusses and cover
the tops of the tiles in a continuous slab. V In the
operation of pouring the concrete, the lower
chords of the trusses and the spacing members
function as the bottoms of the form-work for
2
2, 1 10, 1 10
the beamsv or ribs, and the vertical sides of the
tiles function as the side members of the form
work for such beams or ribs, while the tops of the
tiles function as the form-Work for the portion
of the slab above said tiles.
In Fig. 12 is shown a modi?ed form of tile
which has an angular recess 30 extending along
the lower edge of one side wall, a recess 3| near
the bottom of the outer side wall and a project
'10 ing lower lip forming the lower wall of said re
cess. The angular recess 30 permits one edge por
tion of said tile to rest on the lower chord of the
truss and the chord of the truss at the other
‘ side of said tile is received in the recess 3 I, the lip
15 32 lying against the under side of the bottom
chord of the truss and extending into proximity
with the next tile. When tiles of this shape are
used, the bottom of the lower chords of the
trusses are protected by the projecting lips 32,
20 so that only a ?nishing coating of plaster is re
quired.
.
-
In the ?nished construction, all but the lower
chords of the trusses are embedded in the con
crete and form therewith strong reinforced con
25 crete beams I I.
All of the unembedded metal is
in the region of tension where the concrete is of
little importance in taking care of beam stresses, -
while the lattice portion and all the metal in the
compression region are fully embedded in the
30 concrete and act conjointly therewith. In the
?nished construction, the hollow tiles function to
lighten, strengthen and stiffen the reinforced con
crete construction, assist in supporting the slab
between trusses and furnish a good base for a‘
35
plaster ceiling.
It is noted as an important advantage of my
construction that it dispenses with all temporary
form-work or centering, as the lower chords of
the trusses, the spacing members and the hollow
40 tiles, which perform the functions of centering,
are all permanent and effective elements of my
?nished construction.
The construction hereinbefore described is ca
pable of considerable modi?cation without de
45
parting from'my invention. For instance, instead
that are riveted or welded to the top and bottom.
chords.
What I claim is:
1. A reinforced concrete ?oor
construction
comprising supports, openwork metal. trusses
mounted on said supports, hollow tiles mounted
directly on the lower chords of said trusses with
spaces between them and the lattice portions of
said trusses, the tiles along one side of each of
said trusses having projecting portions under 10
lying the bottoms of the lower chords of said}
trusses, and concrete embedding all portions of _
the trusses above the lower chords thereof said
trusses being strong and rigid enough to sup
port, without substantial de?ection, their own
weight plus the‘ weight of the hollow tiles and wet
concrete, whereby temporary centering may be
dispensed with in the building of said construc
tion.
,
2. A reinforced concrete floor construction com
‘on said supports, metal spacer members for said
trusses, said spacer members being recessed to
receive the lower chordsv of said trusses and hav
ing their ‘main stretches flush with the tops of
said lower chords, hollow tiles mounted on the
lower chords of said trusses with spaces between
them and the lattice portions of said trusses,
there being a space between tiles at said spacer
members with the tiles on either side of said
spacer members resting thereon and concrete
covering said tiles, ?lling the spaces de?ned by
said spacer members and the tiles on either side
thereof and embedding all portions of said trusses
above the lower chords thereof.
3. A reinforced concrete floor construction com
prising supports, openwork metal trusses mounted
on said supports, metal spacer members for said
trusses, said spacer members being recessed to
receive the lower chords of said trusses and hav 40
ing their main stretches ?ush with said lower
chords and having longitudinal stiffening ?anges
on their tops, hollow tiles mounted on the lower
chords 'of said trusses with spaces between them
and the lattice portions of said trusses, there
of using a single truss for each reinforced con
crete beam or girder, two or more trusses may be
disposed side by side with their lower chords abut- '
being a space between tiles at said spacer mem
bers with the tiles on either side of said spacer
ting, or with such chords spaced apart and the
ing flanges of said spacer members and concrete
covering said tiles, ?lling the vspaces de?ned by ‘
50 space closed with a closure strip to prevent leak
members resting thereon spaced from the stiffen
age of the concrete. In such case, the tiles rest ' said spacer members and the tiles on either side
on the outer margins of the outermost trusses.
thereof and embedding all portions of said trusses
Again, instead of having the lower chords of
the trusses resting on walls, as hereinbefore de
55 scribed, it is feasible to suspend said trusses by
placing the ends of the top chords thereof on the
walls or on the top- ?anges of metal girders M, as
illustrated in Fig. 10. In case metal girders are
used, it is desirable to entirely embed the lower
60 portion thereof in concrete for the purpose of
V ?reproo?ng the same. In such case, a trough
shaped ‘ form-work i5 is suspended from the
trusses below and on opposite sides of the metal
girder by means of bolts I6 or the like, sufficient
65 space being left between the metal girder and the
sides of the adjacent tiles to permit the concrete
to be poured on both sides and at the bottom
thereof.
Likewise, while I have mentioned an expanded
70 I-beam as a suitable form of truss, it is obviously
practicable to use other forms of truss, such, for
example, as the well known truss that consists of
angle or other structural shapes forming the top
and bottom chords of the truss and suitably con
76 nected together by diagonal tie or lattice members
20
prising supports, openwork metal trusses mounted
above the lower chords thereof.
4. A reinforced concrete ?oor construction
comprising supports, openwork metal trusses
mounted on said supports, hollow tiles mounted
directly on the lower chords of said trusses with
spaces between them and the lattice portions of
said trusses, and concrete in a continuous mass
covering said tiles and embedding all portions of
the trusses above the lower chords thereof, the
tops of said tiles being lower than the. tops of
said metal trusses and the bottomsof said tiles
being substantially ?ush with the lower chords of
said trusses, said trusses being strong and rigid
enough to support, without substantial de?ection,
their own weight plus the weight of the hollow
tiles and wet concrete, whereby temporary cen
tering may be dispensed with in the building of
said construction and all the concrete poured in
one operation.
.
5. A reinforced concrete ?oor construction
comprising supports, openwork metal trusses
mounted on said supports, metal spacer members
for said trusses, said spacer members having
2,110,110
?anges ?ush with the lower chords of said trusses,
hollow tiles mounted on the lower chords of said
trusses with spaces between them and the lattice
portions of said trusses, there being a space be
tween tiles at said spacer members with the tiles
on either side of- said spacer members resting on
.
v
>
3
the ?anges thereof, and concrete in a continuous
mass covering said tiles and filling the spaces de
?ned by said spacer members and the tiles on
either side thereof and embedding all portions
of said trusses above the lower chords thereof.
WILLIAM N. MURCH.
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