US1461892A - Column cap for concrete buildings - Google Patents

Description

July 17, 1923. 1,461,892 I F. H. CONE-Y COLUMN *CAP FOR CONCRETE BUILDINGS Fil ed Dec. 18, 1922 and useful Improvement To all whom it may concern:

.larly columns with the floors and reinforcing the .fectiveness for the intended work,

Patented July 1?, 192i":u

FRANKLIN H. CONEY. or CHIQAGOQILLINOIS,

contra/Ln C/AI'I non CONCRETE BUILDINGS.

Application filed December 18, 1922. Serial No..607,594', I

Be it known that l, FRANKLIN loner,- a citizen of the United States of'America,

and a resident of Chicago,-county of Cook,

and State of Illinois, have invented a new in Column Caps for Concrete Buildings, of. which the following is a specification. 1 a. i

This invention relates to buildings having reinforced concrete floors, and particuto column caps for connecting the structure at such point.

The object of the invention is to a column cap of extreme simplicity and provide whose vertical dimensions are such that it may be contained between the upper and lower surfaces of the floor slab and be a part of same.

7 The object of the invention is accomplished by the device shown in the accompanying drawing, wherein:

Figure 1 is a bottom plan view of a column cap constructed according to this invention and showing in section a steel column incased in concrete.

Figure 2 is a sectional view taken on the line 2-2 of Figure 1, and includes a showing of the relation between the steel and concrete parts of the structure.

It is well known that the maximum stresses in a reinforced concrete floor and the most-difficult to counteract, are those occurring in the floor adjacent tothe columns. A number of plans have been proposed for properly reinforcing concrete structures at the points of connection of the columns and the floors. Some of the proposed arrange ments involve unsightly enlargements of the columns near the floor or require expensive and complicated forms, and others are more or less complicated in design, or unsatisfactory in not being of the required strength or interfering with the pouring of the cement.

The construction shown in the drawings, so far as is known, overcomes all objections to prior column caps, is of ample strength, is simple in design and inexpensive. This column cap or reinforcement is in the form of a frustum of a cone or a pyramid, or other dished arrangement having ringshaped reinforcements at its outer and inner rims. The web connecting the inner and outer reinforced rings, is a laminated and plate having greaterstrength and thicknessnear the nner-ring and tapering in'thickneSS, to the outer r ng. The stresses produced in the cap due to the weight of the floorlan'd ltSlOLd, results in theouter ring normally being under tension, and inner ring being.

undercompression and the shear being re sisted by the web between the rings.

As shown inthe drawing, the column cap conslsts of an inner collar-shaped compres sion member 1, the horizontal flange 2, of

which, is riveted to the annularweb member 3, built up froma plurality of ring-shaped plates 5, 6 and 7 The web member is of dishform, i.e., inclined upwardly and outwardly from the compression ring 1 to the peripheral reinforcing tension rings 8 and.

9. Rings 8 and 9 are riveted to the part 7 of theiweb member by the rivets 10, and the parts 5, 6 and? of the web member are secured together b the rivetsll; and 12. The column cap t rough the compression member 1 rests upon the flanges 13 riveted to the steel part 14 of the column 15. The floor rod reinforcements are indicated by the numeral 16, and these rod reinforcements may be arranged in any of the approved manners, such as according to the two or four-way systems.

Stirrups 17 at assist in resisting shear in the concrete, and also stirrups 18 depending from the cap inside of its periphery insure good adhesion of the concrete to the cap.

From the foregoing it may be seen that the column cap tapers in thickness from the inner compression part 1 thereof, outwardly to the amply strengthened tension periphcry of the cap, thus affording a reliable and simple structure, not in any way requiring expensive forms for the concrete or interfering with the pouring of the concrete.

The specific design of the construction herein shown and described, may be varied to suit different requirements as to strength and cost, the idea of the invention being mainly to provide a hollow metallic column cap conforming to the surface of an inverted frustum of a cone. The cap may be a single piece of metal of substantially uniform thickness, in which case, the metal near the outer edge, due to the greater circumference being in excess of that near the inner edge, will properly act inrtension for circuinthe periphery of the cap ferential stresses, as well as in compression 1 l for radial stresses. The metal near the inner edge will takejboth radial andcircumfer-V ential stresses. 'Lik ewise, the cap may also be made with inner and outer rings in different planes, as shown in the drawing, with the design of the connectingdveb varied to LA-column cap comprising inner andv outer reinforcing rings located in different parallel planes, and an annular Web member connecting said rings;

.2: A column cap" comprising inner and outer, reinforcing rings located in different parallel'planes, and an annular Web member connecting said rings, said Web tapering in thickness from the inner ring toward the outer'ring. I i

arr-column cap comprising inner'and outer reinforcing rings located in different parallelplanes, and anannular'web member connecting said rings, said web tapering in "thickness from the in'ner' ring toward the outer ring' and" comprising a plurality of plates'secured together; Y Y

4:. A concrete structure-comprising a columnon which is supported at the location of a floor, a floor reinforcement surrounding the, column, said floor reinforcement comprising an outer tension ring and an inner compression ring, theinner compression ring being in a lower plane than the outer tension ring; and a Web member inclined upwardly from the inner. ring to the outer ring.

5. A concretestructure-comprisinga: column on which is supported'at the location of a floor, a-floor'reinforceinent resting onsaid flange and surrounding the column, said floor reinforcement comprising an outer tension ring and an inner compression ring, the inner compression ring being in a lower plane than the outer tension ring; and a Web mem ber inclined upwardly from the inner ring to the outer ring, said Web member tapering in outer ring.

on columnsand a hollow metallic column-cap connecting a column With the floor; conforming to the surface of an frustum ofayoone.

Signed at 136131922.

inverted FRANKLIN me thickness from the inner ring toward the said cap,

outage this17tl1 da ofNoVem-

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