US2110110A - Reinforced concrete floor construction - Google Patents

Description

w. N. MURCH 2,110,110

March 1, 1938.

REINFORCED CONCRETE FLOOR CONSTRUCTION 2 Sheets Sheet 1 Filed March 26, 1956 H45 677- 7'0 QNE Ki March 1 1938. W R H 2,110,110

REINFORCED CONCRETE FLOOR CONSTRUCTION Filed March 26, 1956' 2 Sheets-Sheet 2 4 4 a 7. f; y [iz 3 3 3 1 v /7 /5 1/15 flrrae/vEYs.

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Patented Mar. 1, 1938 ATET FFlCE REINFORCED CONCRETE FLOOR CON- STRUCTION Application March 26,

5 Claims.

My invention relates to reinforced concrete floors. Its principal object is to devise a reinforced concrete fioor construction which can be made without using centering or temporary supports. 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 claimed.

In the accompanying drawings, which form part of this specification and wherein like reference 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 floor construction embodying my invention,

Fig.2 is a side elevation looking in the direction 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 concrete in place,

Fig. 8 is a sectional view similar to Fig. 4, showing the poured concrete,

Fig. 9 is a sectional view showing the invention as applied to a metal beam or grider,

Fig. 10 is a sectional View of a modification in "which the 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 floor applied to the upper chord of the metal truss, and

Fig. 12 is a sectional view showing a modified 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 present construction consists of an I-beam slitted and expanded so as to spread apart the top flange 3 and bottom flange 4 andstill leave them integral- 1y connected by tie members 5. Such expanded beams or girders are well known structural elements.

The trusses are strong and rigid enough to support, without deflection, their own weight plus the weight of the hollow tiles 6, and Wet concrete 1936, Serial No. 70,922

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 between the ends of the tiles supported on opposite sides thereof.

In a typical construction, the trusses are arranged parallel with each other and are spaced apart by means of suitable spacing members 8 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 main stretches of such spacing members to be positioned with the upper surfaces of their marginal 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 flanges being located inwardly from the sides thereof, leaving the marginal portions to constitute ledges for supporting the sides of the tiles 6. By this 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

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 reinforced concrete beam ll. Those tiles that are next to the spacing members have one edge resting on the ledges thereof, the tiles on opposite sides of the spacing member being arranged sufficiently 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 filled with concrete which 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 the beamsv or ribs, and the vertical sides of the tiles function as the side members of the formwork 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 modified 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 projecting lower lip forming the lower wall of said recess. The angular recess 30 permits one edge portion 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 crete beams I I.

V fireproofing the same.

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, so that only a finishing coating of plaster is required.

In the finished construction, all but the lower chords of the trusses are embedded in the concrete and form therewith strong reinforced con- 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 concrete and act conjointly therewith. In the finished construction, the hollow tiles function to lighten, strengthen and stiffen the reinforced concrete construction, assist in supporting the slab between trusses and furnish a good base for a 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 tiles, which perform the functions of centering, are all permanent and effective elements of my finished construction.

The construction hereinbefore described is capable of considerable modification without departing from'my invention. For instance, instead of using a single truss for each reinforced concrete beam or girder, two or more trusses may be disposed side by side with their lower chords abutting, or with such chords spaced apart and the space closed with a closure strip to prevent leakage of the concrete. In such case, the tiles rest on the outer margins of the outermost trusses.

Again, instead of having the lower chords of the trusses resting on walls, as hereinbefore described, it is feasible to suspend said trusses by placing the ends of the top chords thereof on the walls or on the topflanges of metal girders M, as illustrated in Fig. 10. In case metal girders are used, it is desirable to entirely embed the lower portion thereof in concrete for the purpose of In such case, a troughshaped 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 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 that are riveted or welded to the top and bottom chords.

What I claim is:

1. A reinforced concrete floor construction comprising supports, openwork metal trusses mounted on said supports, hollow tiles mounted 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 support, without substantial deflection, 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 construction.

2. A reinforced concrete floor construction comprising 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 having 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, filling the spaces defined 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 comprising 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 having their main stretches flush with said lower chords and having longitudinal stiffening flanges 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 being a space between tiles at said spacer members with the tiles on either side of said spacer members resting thereon spaced from the stiffening flanges of said spacer members and concrete thereof and embedding all portions of said trusses above the lower chords thereof.

4. A reinforced concrete floor 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 flush with the lower chords of said trusses, said trusses being strong and rigid enough to support, without substantial deflection, 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 construction and all the concrete poured in one operation.

5. A reinforced concrete floor construction comprising supports, openwork metal trusses mounted on said supports, metal spacer members for said trusses, said spacer members having flanges flush 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 between tiles at said spacer members with the tiles on either side ofsaid spacer members resting on the flanges thereof, and concrete in a continuous mass covering said tiles and filling the spaces defined 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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