US1173152A - Reinforced concrete construction. - Google Patents

Description

H. II/I. HINCZ.

REINFoRcED CONCRETE CONSTRUCTION.

APPLICATION FILED IAN. 2?. 1912. Lwi., Patented Neb.22,1916.

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H. IVI. HINCZ. REINFORCED CONCRETE CONSTRUCTION.

APPLICATION FILED IAN. 2. I9IZ. LIT9I52. v Patented @10.221916 2 sHEETs-sHEET 2.

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HIPOLI'I IVI. HINCZ, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 PATENTED DEVICES COMPANY, 0F PORTLAND, MAINE, A CORPORATION 0F NE.

REINFORCED CONCRETE CONSTRUCTION.

To all whom 'it may concern.'

Be it known that I, HIPoLrr M. HINCZ, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Reinforced Concrete Construction, of which the following is a specification.

'lhis invention relates to girderless or flatslab lfloors, roofs and similar structures. ln prior systems of construction, the metallic reinforcing membersj have not been economically distributed within the slab, but on the contrary, have been so arranged that in 'orde-r to obtain sufficient reinforcement in the regions of greatest'strain, it has been necessary to use an undue amount of reinforcement lin other regions, thereby involvingl waste of metal. v

llt is an object of this invention to devise an arrangement of the reinforcing members which shall be consistent with the distribution 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.

ln certain prior constructions, each floor panel has been considered as consisting of four beams vextending directly between col umns, with a 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 beef 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 ydesign the panel in such a manner that a minimum thickness of concrete may be employed. l

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 and applied load upon the central portion of the panel, more nearly directlyto .the columns than has heretofore been possible. Y f

One form of construction by means of which the foregoing objectsimay be attained is illustrated in the accompanying draw-a ings, whereinl Figure 1 is a :Eragmental top plan view of a floor embodying the invention. Figs. 2,

3, 4 and 5 are sectional views taken in the Specification of Letters Patent.

Patented' ree. aa, rare.

Application led January 27, 1912. Serial No. 673,794.

i planes of dotted lines 2 2, 3 3, 4 4, and 5 5, respectively, of Fig. 1. For the sake of clearness, some of the reinforcing bars are omitted in F ig. 5.

In the drawings, the numeral l denotes columns of any suitable or common construction, and 2 indicates flaring column caps. These caps may be omitted in some instances, as when the spans are short. The

columns and capitals may be reinforced in any preferred manner.

llhile 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 panels, each panel being supported at its corners upon the columnsl 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 tbe columns to the corners of the rectangle, for supporting said beams; and four elongated slabs extending directly between columns and supported by the beams. 'lhe slabs and beams are represented by dot-and-dash lines in the lower portion of Fig. LA. being the central slab, B the four beams that carry said slab, C the cantalivers, and D the slabs extending directly between'the columns.

rlhe slab A may be reinforced in any preferred manner; in this instance l 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. ln the present embodiment, each bar' 3 extends from a point nea-r the lower face of one beam B, horizontally through the slab A, thence upwardly and across the opposite beam B and into the adjacent slab D. The bars 3 extend alternately to opposite slabs D.

rlhe reinforcing for the beams B may be of any suitable character, but preferably each of said beams is reinforced by bars` 4e, as shown in Figs. 1,32 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 slab D.

Each column supports two cantalivers C extending diagonally between columns. Each' arm of each cantaliver carries one corner of ay rectangle formed bythe four beams B. ln the structure shown as an example, each cantaliver is reinforced by a group of bars extending within the upper portion of the floor slab, with the end por` tions of the bars underlyingthe bars 4 at the intersections of the beams B. Preferably, although not necessarily, the ends of the lbars 5 are bent diagonally downwardly 4 at 5a to assist in caring for diagonal'tension.v If desired, the eXtreme ends 5 of the bars 5 may be bent upwardly into the form of hooks to afford additional anchorage for the bars in the concrete. The bending of the bars 5 as just described affords means for supporting said bars upon the formwork (not shown) during the process of uerection, the downwardly bent portions serving as gages to space the body of the bars at the desired distance above the form-work. No material portion of the bars 5 Will be exposed upon the under side of the slab,

when the eXtreme endsl of the bars are bent upwardly as shown. If desired, the middle portions of the bars 5in one cantaliver may be deflected or depressed sufficiently to permit both series of bars 5 to horizontal plane.

Each slab D is herein shown as reinforced lie in the same by means of a series of transverse rods 6 lying in the lower portion or tension region of the slab and extending into the adjacent beams The slab is further reinforced by the extended portions of the rods 3.

In the completed structure, each beam B i supports only one-fourth of the load upon the slab A, together with the load directly above said'beam B. The four beams B deliver the major portion of their loads to the lcantalivers C, which in turn deliver the load to the columns.

Each cantaliver arm is relatively short and is fully counter-balanced by the load upon the opposite arm. The lminimum lquantity of metal and concrete required in each cantaliver may be readily determined, since it is possible to measure Vention is .claimed generically in my copending applica-tion led January 27, 1912.

' I claim as my invention:

A girderless monolithic reinforced-concrete structure consisting of a plurality of columns and a plurality of concrete slabs over the columns, said columns being located at the angles of the slabs, each slab comprising a central portion, reinforcement carrying. the central portion, said beams .having intersecting ends and being arranged in the form of a polygon, reinforcing means over the columns extending diagonally of the slab and' forming-cantalivers that directly support the ends of the beams at .the angles of the polygon, slabs extending directly between columns, the last mentioned 'slabs being inclosed and supported by said beams, the reinforcement of the central por-- tion extending transversely throughthe last mentioned slabs, and transverse reinforcement in the rtension regions of said last mentioned slabs. I v

In testimony whereof I aix my signature in presence'of two witnesses. y K

HrPoLrr HINC'Z.

Witnesses: e EARL C.4 CARLSON, GEORGE L. CHIND-AHL.

vSerial No. 673,793,

vfor the central portion, reinforcement forming a plurality of beams surrounding and

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