US1416548A - Reenforcing concrete structures - Google Patents

Description

J. DI SIASIO.

A r v nEENFoRcING cowcmesmucuaes.

APPLICATION FIL-ED JUNE I4, 1920. L41 6,548, Patented May I6, 1922.

2 SHEETS-SHEET 1.

J. DI STASID.

REENFORCING CONCRETE STRUCTURES.

SHEET 2.

W, w M

2 SHEETS- vendan.

Patented May APPLICATION FILED JUNE 14, 1920.

JOSEPH DI STASIO, 0F NEW YORK, N. Y.

REENFORCING CONCRETE STRUCTURES.

Leraars.

Specification of Letters Patent.

Patented May ie, ieee.

Application filed June lll, 1920. Serial No. 388,959.

T 0 all whomzt may concern:

Be it lrnown that I, JOSEPH DI STAsio, a citizen of the United States, residingy at the city, county, and State of vNew York, have invented certain new and useful improvements in Reenforcing Concrete Structures, fully described and represented in the following speciiication and the accompanying drawings, forming a part of the same.

This inventionrelates to an improvement in reen'forced concrete floor construction.

The particular object vof the invention is to provide a simple, economical and efficient means for producing a flat slabl floor construction composed of a series of columns arranged in rows, with adjacent columns forming bays, and bands of metal reenforcing steel mesh extending from column to column in each direction, or at right angles to each other, and with additional bands of such mesh between the columns, the latter 'bands alsorunning at right angles to each otherand extending overthe bays, thereby dispensing entirely with cross beams or girders'and enabling a building to be erected ,with great rapidity and economy of labor 4and material, and capable of bearing greater floor strains per given area than reenforced concrete structures now known.

For a full understanding of the invention, a detailed description of a preferred embodiment thereof will now be given in connection with the accompanying drawings, and the novel features thereof then pointed out in the claims.

In they drawingsyFigure l is aplan view of a portion of floor with4 the concrete and metallic mesh broken away to illustrate the arrangement of the reenforcing means;

lFigures 2' vand 3 are sections respectively I ony the lines 2-2 andB--B of Figure 1, showing the 'supporting columnl heads in distance. Figure 4; isa perspective view of a portion of a floor, showing the relative arrangements of the reenforcing steel mesh bands.

i Referring now to the drawings, thev numeral lindicates the ordinary concrete col'- umn withV the usual square head enlargement 2. Around each such column head enlargement, and positioned on theJ usual temporary support (not shown), at suitable and approximately equal distances from such column head enlargements, aresmall concrete blocks, 3, eight such blocks preferably be- 4 ing used at these points, as shown. On these proximately the same size as those formed by the chair bars surrounding the column heads. All the chair bars have their ends overlapping on the supports 3 and are securely wired to the latter `in any suitable manner.

The structure so far described, lis now ready to receive. the first or lower bands or strips of steel. mesh 8,' such brands being of suitable lengths. vThe arrangement of these bands of steelmesh with relation to certain chair bars over which they pass and certain additional chair bars which are positioned thereover as hereinafter described and under which such mesh passes, constitutes one of the important features of the invention` the great strength and rigidity of the construction derived by my invention depending wholly on the arrangement of such bands or strips of steel mesh with respect to the chair bars and the position of such strips relatively tothe upper or lower surface of the concrete in which such strips are eventually embedded, which arrangement will now be described-` y' The bands of steel mesh are of slightly less width than theV squares formed by the chair bars and their concrete block supports, and the first laid bands run from column head to column head in two directions, or at right angles to eachy other, and are depressed or dip into the spaces between the column heads.

Additional chair bars t andsuppor'ts Bare then positioned in the depressed squares, and the second or superposed bands are laid thereon, the latter bands running at right angles to each other. The bays andv spaces between the columns are thereby covered with bands .of steel mesh, one of which, i. e., the rstlaid ofthe second set or superposed bands, as also the last laid bands of such set, dipping only into the spaces or bays which are central of each set of four columns.

y The first laid bands start from the wall section A and extend over those squares which are in line with the columns, the bands or stripsof steel mesh passing over chair bars 4 nearest the wall and parallel thereto and are bent or dipped down, from the point at which they cross such chair bars, at an angle of approximately 4to@ to a point near the surface of the temporary support on which the blocks 3, 3 are positioned, thence straight across such space and are thenbent upward,y at the same angle to the chair bars surrounding the column head, and run straight across such column head and the chair bars arranged thereon, and so on, such squares into which the first layer of mesh dips and the column heads alternating with each other. Each row of squares in line with. the column heads are thus covei'ed from wall to wall in each direction, as best seen in Figs. l and 2.

After the floor has been partially covered f in the manner above described, the additional concrete blocks 3 and chair bars Ll securely Wired thereto are positioned in all those depressed squares in line with and between the column heads. A. second layer of bands of steel mesh is now laid in each direction, oi at right angles to each other, over the chair bars in the depressed mesh squares between the column heads, the last laid bands being dipped or bent downward, however, only in the bays or spaces which are centrally located with respect to each set of four columns, as explained above. All such bands or strips terminating in wall beams are preferably hooked or bent down, as at 9 (Fig. 2), and at their opposite ends, if not suiiiciently long to extend from wall to wall, at least lap entirely over the column heads, at which point a continuation of such strips or bands may be started. Y

All bands lap entirely over the chair bars around column heads and are laid directly on each other at these points. a

Around the wall section, I preferably pro- Vide short length chair bars 7 wired to concrete block supports as previously described, and narrow strips of steel mesh running parallel with the wall and depressed only in those spaces directly between the halfcolumn heads formed at suchpoints, such nar row bands dipping or being bent downward into the spaces between half column heads, as in the outer floor space squares, after which additional chair bars 4t and supports therefor 3^ are positioned thereon in the same manner as before described with reference to the rest of the floor space, over which latter bars the mesh bands starting at the wall beams and running` at right angles to the wall are adapted to pass. il yAn important feature of the invention is in the provision of short lengths of steel mesh placed over the column-heads before the placing of the chair bars and their supports thereabout, such mesh running from the wall beams to a suitable point under and in contact with the steel mesh at its lowest point where it is dipped into the squares intermediate of and in line with the. column heads. I have indicated such short lengths of mesh with the numeral 9. By the provision of such short lengths of mesh arranged in this way, any unlooked for shift in tensile strains will be compensated for. lt will be obvious suoli short lengths of mesh may be so arranged on all the column heads, if desired.

The parts when arranged as above describedvare in proper position to be embedded in the concrete, which is then filled in to a depth sufficient to cover all the parts and is then smoothed off in the usual manner and allowed to set.

lt has been found in practice that a diamond mesh is suited to the purposes of the invention, but it will be understood that any other suitable mesh or metallic fabric may be used, The mesh may be properly dipped or bent downward into Ithose squares where required by any well known. means, such, for instance, as a heavy tamping tool.

It will be understood that l do not confine myself to the exact arrangements of parts herein described, as it will be obvious that various modifications of the arrangement may be made and still be within the scope of the invention as defined by the claims.

l. A. flat slab floor construction, comprisn ing a series of columns arranged in rows.l adjacent columns .forming bays therebetween and a bay central of each set of four columns, bands of metallic reenforoing mesh of a width substantially equal to said bays laid at right angles to each other and eir-y tending over the column heads and the bays between and in line with said column heads, said bands being` depressed in such bays, and superposed bands of metallic mesh of a width substantially equal to the bays laid at right angles to each other and the first laid bands and extending over the bays which are central of each set of four columns.

' 2. A. flat slab floor construction, compris :ing a series of columns arranged in rows, adjacent columns forming bays, chair bars and supports therefor arranged around .the column heads, bands of metal reenforcing mesh extending from column head -to column head positioned on said chair bars, said bands being depressed in the bays between adjacent column heads, chair bars and supports therefor positioned onsaid depressed mesh sections forming central Abays, and superposed bands of metallic rmesh laid at right angles to each other and supported by the last mentioned chair bars, said latter lbands extending `over the bays central of each set of four columns and being depressed only in such central bays.

3. A flat slab' floor construction, comprising a series of columns arranged rows, adjacent columns yforming bays, chair bars and supports' therefor arranged about the column heads, bands of steel mesh positioned on said chair bars and extending over and being depressed in the bays between adjacent colunm heads, chair bars and sup ports therefor positioned 4on top of such mesh in the depressed sections forming central bays, and superposed bands of steel mesh laid at right angles to each other over said last mentioned chair bars and covering the bays central of each set of four eolumns, said latter bands being depressed and in contact in such central bays.`

4. A flat slab floor construction, comprising a series of columns arranged in rows, adjacent collumns forming bays, enlargements formed on said column heads, Chair bars and supports therefor arranged about said column head enlargements, metallic mesh bands positioned on said chair bars and extending over and covering the bays between adjacent column heads and being depressed in such bays, chair bars and supports therefor located on top of the mesh bands in 4such depressed sections forming central bays, and superposed bands of metallic mesh arranged at right angles to each other and extending over the bays central of each set of four columns, said latter bands being depressed and in contact only in said central bays,

In testimony whereof,I have hereunto set my hand.

JOSEPH DI STASIO.

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