US1461891A - Concrete building - Google Patents

Description

July 17, 1923- l,46l,'89l

F. H. CONEY CONCRETE BUILDING Filed Feb. 11. 1922 2 Sheets-Sheet 1 F. H. CONE! CONCRETE BUILDING Filed Feb. 11 1922 2 Sheets-Sheet 2 Patented J le 17, 1923.

, UNITED STATES PATENT OFFICE.

a. comma, or cmcaeo, rumors.

CONCRETE BUILDING.

Application filed February 11, 1922. Serial No. 585,875.

To all whom it may concern: 7

Be it known that I, FRANKLIN H. CONEY, a citizen of the United States of America, and a resident of Chicago, county of Cook,

and State of Illinois, have invented a new and useful Improvement in Concrete Buildings, of which the following is a specification. a

This invention'relates to flat 'slab'construction and particularly to column caps designed to reinforce, support and be a part of.

the floor. slab in the area adjacent topthe supporting column. An object of the invention i to provide a column cap of increased strength with respect to its dimensions whereby it is possible to avoid the loss of space resulting from the necessity of using flaring column heads or the de ressed heads surrounding each column. A urther object is to simplify the form structure making it less expensive, and further to permit the use of steel columns where a smaller diameter column is desired. Another object of the invention is to provide a completel connected skeleton of steel upon whic the forms may be supported and which becomes a art of the completed structure.

he objects of the invention are accomplished b the device shown in the accom-,

panying awings, wherein- Figure 1 is a plan view of the improved column cap showing .a column in section, and 'the floor reinforcing bars which are secured'to the cap.

Fig. 2 is a side elevational view of the column ca showing portions of a floor and upper an lower columns.

Fig. 3 is. a sectional detail of a column taken on the line 3--3 of Fig. 2

' cast plate or built-up plate consistin several plates riveted or welded toget or,

ltd

Figs. 4 and 5 are respectively views like Figs. 1 and 2, but show the invention as used in connection with steel columns. The inventlon 1s carried out by means of a column cap, which may be of various forms, such as a cast steel plate with ribs, a solidf but is here" shown as preferably comprisin a pair of spaced plates with spacers or we members between these plates. The column caps are ed to the upper ends of columns, but where'two columns are in coaxial relationship, the cap between the same is socured to both. In the cap as shown, the tension stresses are taken by the top-part of the cap, and the compression not: are

taken by the bottom part. The tension stresses are greatest at the top surface of the 'top plate, and diminished to zero at the neutral plane dividing the top and bottom parts, the compression stresses being greatest at the bottom surface of the bottom plate, and

' diminishing upward to zero at the same neutral plane. The maximum shearing stresses take place within the area of the cap, and are therefore taken by this cap. The column caps of each floor are preferably connected 'by small I-beams where steel columns are used in order to afford rigidity to the entire structure. and supports for the temporary forms for the concrete. The edges of the plates "are perforated to receive the bentends of reinforcing bars, and both plates are provided with a plurality of filling apertures so that concrete may be poured into the spaces between and below the plates of the ca v ince the stresses in a floor slab of the kind illustrated, are greatest over the point of support, in. this case the. column, the column. cap is designed to suitably resist these stresses within its area. Since the cap is provided with means for attaching thereto all reinforcing bars that intersect it, thestructure afi'ords high resistance toshifting of these bars. The tensile st w in the rods in the top of the slab at the point of attachment to the cap are transferred to the top plate, being the same 1n efiect as though the rods were continuous across the area of the cap. The compression stresses in the concrete and rods in the lower part of the slab at the edge of the cap and point ofattachment of the rods are transferred to v the bottom late, the effect being the same so arranged as shown in Figure 1 to give the necessary strength to the column ca and these capsextend outwardly from tli e columns into the door 9 overthe area which i shear ort.

.001 are employed The upper plate '3 is provided with openings 10 through which concrete may be poured into the spaces between the spacing blocks 8. Near the edges of each plate 6 and 7 are perforations 11 and through which extend the bent ends of the reinforcing bars 12. Many of these bars extend from one column cap to another, but some are short as indicated in the. drawing, and all are arranged in the usual most approved way to reinforce the floor and properly resist the strains to which the floor is subjected by its weight and load.

5 The I-beams 13 are secured to the column 1 and while the I-beams are not always employed, when they are used they assist in afiording good supports for concrete forms and in making a fairly rigid completely connected steel skeleton for a concrete building.

The construction as illustrated requires only the simplest forms to retain the concrete when poured to form the column and floors, and avoids the labor, space and expense of beams and flaring or depressed column heads.

Where concrete columns of the type illustrated in Figures 1 and 2 are used, holes must be provided in the column caps for the reinforcing rods of the column to pass through. These reinfoncing rods 16 as shown in Figure 2 are arranged so that the rods of the lower column pass upwardly and overlap the rods of the upper column 1 for a short distance. The rods 16 for the upper column terminate at their lower ends in the plane of the surface of the floor.

To ofiset the tendency to bend of concrete columns having an eccentric load, and to resist bending of the column due to presj, sure of wind the short reinfoncing rods 17 are employed. These pass through holes in the metallic column cap, some depending from the cap and extending into the lower column and others extending upwardly ininforcements are bent as indicated atl8 to hook over the plates 3. If the floor has an excess load, for instance, at the left of the column, Figure 2, then the "rods 17 at the left of the column would act to resist the 'gbending movement in the column, and the 'rods 18 on the right side of the column caps through the plates 14 riveted thereto,

- to the upper column. The ends of these reforced columns and flooring, and reinforcos ing plates forming part of the flooring and located at the columns, and to which floor reinforcing bars are attached, the reinforcements in the column including short bars which pass through said plate and some of which bars extend upwardly and some downwardly into the columns, and all having their ends at the plate bent over.

2. A column cap for concrete buildings, comprising a pair of horizontally disposed metal plates one above the other, spacers or shear members bet-weensaid plates, means for securing said cap to av column and said plates having provision 'for attachably re ceiving floor reinforcing bars.

3. A. column cap for concrete buildings, comprising a pair of horizontally disposed metal plates one above the other, spacers or shear members between said plates, means for securing said cap to a column, said plates having provision for attachably receiving floor reinforcing bars, and both-of said plates being provided with concrete receiving openings. p

4. A column cap of the class described comprising spaced upper and. lower plateswith web members between said plates, said upper and lower plates of the cap having provisions for attachably receiving floor reinforcing bars.

5. A column cap of the class described comprisingspaoed upper and lower plates FRANKLIN H. CQNEY.

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