US1205347A - Reinforced concrete construction. - Google Patents

Description

H. M. HINCZ.

RExNFoRcEn CONCRETE coNsTRucTmN.

APPLICATION FILED 1ANZ7| i912.

Patented Nom 21, i916.

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H. Ni. HINCZ.

REINFORCED CONCRETE CONSTRUCTION.

APPLICATloN FILED 11111.27. 1912.

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I I-IIPOLIT M. HINCZ, OF CHI-CAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

PATENTE!) DEVICES COMPANY, -OF PORTLAND, MAINE, A CORPORATION OF MAINE.

REINFORCED CONCRETE CONSTRUCTION.

specificationof Letters Patent. Fiamme@ Nov, 211, 1916,

Application led January 27, 1912. Serial No. 673,793.

T all whom z' may concern Be it known that I, HrroLrr M. HINCZ,

l residing at Chicago, in the county ofj Cook This invention relates to girderless or flatslab floors, roofs and similar structures. In

prior systems of construction,l the metallic reinforcing members have not been economically distributed within the slab, but on the contrary,l have been so arranged that in order to obtain sufficient reinforcement in the regions of greatest strain', it has been necessary to use anundue amount of reinforce- It yis an object of this invention to devise an arrangement of the reinforcing members .which shall be consistent with the d1stribution of stresses in the slab, whereby the metal shall be placed only where needed, and in amounts which are'properly proportioned to the duty to be performed.

In certain prior constructions, each floor panel has been considered as consisting of four beams extendingldirectly between columns, witha rectangular' slab supported by said beams. Such beams being of long span, require a' considerable depth of concrete, and therefore if the panel is to be of uniform thickness its thickness will be determined by the thickness required for the beams, thus involving an excessive use of concrete.

One of the objects of this invention is to design the panel in such a manner that a minimum thickness of concrete may be em ployed.

A further object is to provide, in a system of construction permitting of accurate analysis and determination of stresses, means to transmit the stresses due to the dead weight of an applied load upon the central portion of the panel, more nearly directly to the columns than has heretofore been possible.

One form of construction by means of which the foregoing objects may be attained is illustrated in the accompanying drawings, wherein- 2, 3, 4 and 5 are sectional views taken in the respectively, of Fig. l.

For Athe sake of clearness, some of the reinforcing bars are omitted in Fig. 5

vIn the drawings, the numeral 1 denotes columns of any suitable or common conplanes of dotted lines 2 2, 3 3, 4 ,and 5 5,

struction, and 2 indicates flaring column caps. These caps lmay be omitted in some instances, as when the spans are short.v The columns and capitals may be reinforced in any preferred manner.

While the floor is herein shown as of monolithic construction, it may be considered as made up of a plurality of rectangular panels. Fig. l illustrates two'complete 'floor panels and portions of several other .Y ment in other regions, thereby involving" `waste of metal.

panels, each panel being supported -at its corners upon the columns. Each panel is considered as comprising a central rectangular slab; four beams arranged in the form of a rectangle surrounding and supporting said slab; cantalivers extending diagonally from the columns to the corners of the rectangle, for supporting said beams; and four wide shallow beams extending directly between columns.

The slab and beams are represented by dot-and-dash lines in thc lower portion of Fig. l, A being the central slab, B the four beams'that carry said slab, C the cantalivers, and D the beams extending directly between the columns.

The slab A may be reinforced in any preferred manner; in this instance I have shown a series of bars 3 extending transversely of the slab, and a similar series of bars 3 crossing the other series at right angles. In the present embodiment, each bar 3 extends from a point near the lower face of one beam B, horizontally through the slab A, thence upwardly and across the opposite beam B and into the adjacent beam D. The bars 3 extend alternately to opposite beams D.

The reinforcing for the beams B may be of any suitable character, but preferably each of said beams is `reinforced by bars i, as shown in Figs. l, 2 and 3. These bars extend through the tension region of the beam and thence upwardly and transversely through the upper portion of another of the beams B and into' the adjacent beam D.

Each column supports two cantalivers C extending diagonally between columns.`

Titi- Each arm of each cantaliver carries one corner of a rectangle formed by four beams B. ln the structure shown as an example, each cantaliver is reinforced by a group of bars 5 extending within the upper portion of the ioor slab, with the end portions ofthe bars underlying the bars fl at the intersections of the beams B. Preferably, although i not necessarily, the ends of the bars 5 are bent diagonally downwardly at 5 'to assist in caring for diagonal tension. lf desired,

` the extreme ends 5X-of the bars 5 may be bent upwardly into the form of .hooks to afford additional anchorage forl the bars in the concrete. The bending of the bars 5 as just described a'ords means for supporting said bars upon the form-work (not shown) during the process of erection, the downwardly bent portions serving'as gages to space the body of the bars at the desired distance above the formework. No material portion of the bars 5 will be exposed upon the under.

side of theslab, when theextreme ends Aof the bars are bent upwardly as shown.

If desired, the middle portions of the bars 5 in one cantaliver may be deflected or depressed suiiciently to permit both series of.

bars 5 to lie in the same horizontal plane.

Referring now to the beam D: Vhile nthese may be reinforced in various ways,

the reinforcement herein illustrated 'comprises longitudinal bars 6 each extending from a point in or near the axis of av column,

thence horizontally through tlie tension region of the beam, thence upwardly and over the opposite column to a point in the adjacent alined beam D. Each beam is also reinforced against torsional stresses by trans-v verse bars (which may, if desired, be exten sions of the bars 3, as herein shown) lying in the upper portions of the beam.

In the completed structure, each beam B' supportsonly one-fourth of the load upon the slab A, together with the load directly above said beam B. The four beams lB deliver the major portion of their loads tothe cantalivers C, which in turn deliver the load to the columns. Each cantaliver armis rela. tively `short and is fully counterbalanced by the load upon the opposite arm. The minimum quantity of metalv and concrete ,re'

quired in each cantaliver may be readily def termined, since it is possible to measure accurately the stresses to be borne bythe cantaliver.

` In the embodiment which has been selected for illustration, the panels are rectangular, and the slab A and the set of beams B are accordingly rectangular, but it will be understood that the parts maybe of other forms, and that there may be more or less than four beams B, depending upon the shape of the panel; also that there may be vmore than one set yof beams such as B.

I claim as my invention:

- 1. A girderless monolithic reinforced-concrete construction consisting of a plurality of columns, ,and a fiat slab of concrete over the columns, said columns being located atj the angles of tlie slab, said sla-b containing reinforcment extending directly from one column to another and forming beams of ya width exceeding the thickness of the slab,

said'slab comprising a central portion, re-

inforcement extending vin two directions through the central portion, part of the last mentioned reinforcement being extended transversely .through and beyond the beams,

over the columns, said columns being located at the angles of the slab, said panel containing vreinforcement extending directly from one column to another and forming beams of a width exceeding the thickness of the panel,

.said panel comprising a central portion, re-

inforcement extending in two directions through said central portion, a part of the last mentioned reinforcement extending transversely through and beyond the beams, reinforcement within the panel forming four beams lying between the iirst nien-y vtioned beams. and the central portion and carrying they .central portion, the second mentioned beams having intersecting ends andv forming a rectangle, two groups of reinforcing elements crossing one another above each column and forming cantalivers,

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the outer ends of said groups of reinforcingl elements underlying the reinforcement fory the'second mentioned beams at the corners *of the rectangle.

" ,In testimony whereof l'aflix my signature inl presence of two witnesses;

HIPOLT M. HlNCZ. Tt/'itnesses EARL-C. Canteen. l Gannon L. Ciiiiisairn.

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