US1348445A - Reinforced-concrete construction - Google Patents

Description

E. P. PRESS. REINFORCED CO'NCRETE CONSTRUCTION.

APPLICATION F|LED1UNE2,|9H.

Patented. Aug. 3,1920,

A 2 SHEETS-SHEET l.

FLE

Maff- Mgg E. P; PRESS.

ITEINEOITOEO cONcITETE CONSTRUCTION. l

APPLICATION FILED IuNE 2, I9I7. ,348,44, I i Patented Aug. 3, 1920..

2 SHEETS-SHEET 2.

WITNESSES- ,l

unirse ermee @F 'CEQ a EARLE i-v rnnss, or Lann BLUFF, ILLINOIS.

REINroncEn-conciinrn coiasriaricfrIoiv.`

iis-raies.

Application filed JiineZ, 1917. SerialjNo. 172,367.

To all whom t may` concern.' Be it known that l EAIzLE P. PRESS, a citizen of the United States, and a resident of the village of Lake Blu, in the county of Lake and State of `illinois, have `invented certain new and useful- Improvements inla Reinforced-Concrete Construction and l do hereby declarev that thefollowing is a full,

lil

clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of. this specification.

rlhisl invention relates to a flatslab reinforced concrete construction W'hereinthe reinforcement members leading into ythe columns from the floor panels arearranged in the most efficient manner to properly take care of the various stresses, whereby the licor loadsL are transmitted directlyto the columns and With thereinforcement members properly spaced iny the forms fand 'se- 'cured to one another-to permit the concrete to be poured therearound Without accidental displacement /of the reinforcement.

By this reinforced concretev construction, the loads upon the panels are carried direct to the column, instead of to a beam and-then by Way of thebeam to a column. Furthermore, the elimination of beams and girders from the kceiling is a great advantage increasing the lighting efiiciency `and facilitating attachment V'of equipment and other fixtures to the ceiling, 'Thefcost of erection of the forms is cheapenedv and greatly simplified owing to the fiat Y uninterrupted area of forms which may be constructed from standard lengths so that the greater Vpart of the form work mayy besalvagedafter the structure is completed. Giving to the fact that the ceilings of the structure are unobstructed by beams orlgirders, the saving in the height of the building is considerable, asv all of the space betweenloors may be efficiently' `used, and this Vresults in afsaving in the cost of erection of the building.

ln monolithic concrete construction-at the Vpoint at which the flat slab or floor structure forms a part ofthefcolumn', a negative bendingmomentexists in the area above the column, Whereas inthe floor" panels b'e-v tween the column, a positive bending` moment exists. The point at which vthe bend- Specicatioii of Letters Patent.

Patented Ano. 3, 1520.

ing momentchanges from positiveto negative is termed the point of contra-exure, and of course, it is, desirabletoy properlydispose theA reinforcement members of the Vstructure so that the tension and the shear stresses are borne by the reinforcement members,kand the compression stresses by the concrete itself. A

lt is an object therefore of this invention mounted upon supports `proyided for the v purpose and held secure against accidental displacement during pouringV of the concrete,

and vwith the mainreinforcement members,

bent so as to be disposed in the areajsubject to tension due to the respective positive and negative bending moments existing ,in the structure, and With the angled portions of said reinforcement members ,'disposed'in the area of shear or contra-flexure of the structure. v

l It is also an object of this inventionxto provide a fiat slab concrete construction wherein reinforcement members are .properly bent for correct disposition in thejstructure, Wlienfformed, to properly take care of the variousr stresses, Which aretransmitted from thel Vfloor panels directly to .the columns, and with means for supporting and connecting the reinforcement members to insure proper spacing and-disposition thereof,

as` Well as to positively securethe same from accidental displacement when the concrete is poured, and further permittingthe reinforcement'to be rapidly fabricated bythe Workmen. Y c c y lt is ak further object c f this invention to 'provide a reinforcedc'oncrete Ycoiis'trufctio'n .wherein the series of secondary diagonal reinforcement Vmembers fof the floor. kpanels intersect one .another at the columns `and adjacent one another and the bent portions of said members disposed substantially at the point of contra-fiexure in the flat slablat j the column. I p

It is furthermore an object of this `invention to provide a reinforced concrete structure wherein certain of the secondary diagonal panel rein-forcement membersentering a column pass `directly therethrough and with others thereof terminating at the column, and with the main reinforcement members which terminate in the column heads bent upwardly at the point of entrance into the column head disposed above said secondary members, and with-the terminating ends of said main members laid adjacent one another and interlaced and properly spaced upon the form.

Other and further` important objects of thisinvention will be evident from the dis- Y closures in the drawings and specification.

. `Theinvention (in a preferred form) is illustrated in the drawings andV hereinafter more fully described.v In the drawings:

v Figure 1 is a fragmentary top plan lview of the reinforcement members of a column head, utilizing means for support and spacing thereof embodying the principles of my invention. Y Fig. 2 is a fragmentary central vertical Asection taken therethrough with parts omitted.

Fig. 3 is a plan viewfbroken away of a headsu'pport for a column head.

Fig.l 4f is a side elevation thereof.

Fig. 5 is a sectional'detail taken .on line 5+5, of Fig. 3. L

Fig. 6 is a detail view illustrating the means of wiring two reinforcement rods crossing one another to the head support.

Fig. 7 is another `detail view with the head support in'section illustrating means of wiring a reinforcement' rod thereto.

Fig. 8 is a sectional detail on line 8--8, of Fig. 2, showing a pair of bar spacers engagingxthree adjacent rods.

s shown in the drawings:

Thev reference numeral l, indicates as a whole the form for the column of a concrete structure, and the reference niuneral 2, the form for the floor or horizontal panel beam system for the iioor of the structure. In the form of construction illustrated in Fig. l, the'main reinforcement rods are denoted bythe reference numeral 3, andY extend directly from column to column intothe columnheads and are bent upwardly and suitably supported as hereinafter described and terminate therein with said terminating ends laid side by side. Secondary reinforcement rods are denoted by the reference numeral 4, and extend diagonally through the floor panels into the column head around the lower portion thereof, terminating therein. The reinforcement rods 3, as they lead into the column head slightly beyond the point gatV which they are bent upwardly are supported upon a frame 5, consisting of a one piece bar of metal or a plurality of bars arranged substantially in rectangular form, and forming a head support for the ter-l minating ends of said main reinforcement members. Said head support 5, is apertured at a plurality of points and engaged therethrough are the bent ends of triangular supports or legs 6, which are of a heightdependent upon the particular design ofthe structure in order to secure proper spacing position of the head support 5, for the reinforcement rods 3, supported thereon. Said i supporting legs '6, may be stapled to the form 2, as indicated by the reference nui meral. 7, and shown in Fig. l5,*to secure the same against accidental displacement. Also engaged through apertures in' the headisupport bar 5, are a pluralityof soft wires 8,

the spacing of which has been predetermined i by the design for the reinforcement so that said wires may be used as shown in Figs.

6 and 7, to fasten the reinforcement rods 3,

lsecurely vupon the support frame 5.

The reinforcement rods 3 and 4, are all supported in spaced relation upon the form 2, by bar spacers, each of which consists of a rod 9, one end of which is bent inwardly and downwardly as denoted by the reference numeral 10, to afford a recess and supporting leg for a rod 3, and the other end of which is similarly bent inwardly and down wardly as denoted bv the reference numeral l1, to` afford a recess and supporting leg for another rod 3, `whereby the rods 3, are supported spaced from one "another andspaced from the form, as clearly shown in Fig. 8,.

j The head supports are made up in the i shopV and sent to the job with the holes for the leg supports and fasteningwires disposed at the proper interval for spacing of all bars. The fastening wires 8, are'gener- ,j ally inserted through the frame', at the shop for properly tying all the reinforcement bars in their correct position. The head support is spaced from the form by the supporting legs `6, which are fastened t0 the form thus giving a rigid support-for properly holding the lreinforcement Yrods fixed in theupper port of the slab aroundthe column head, and also acting as a spacer for thereinforcing bars radiating from the1co1- c umn head.4

I ain aware that various details of construction may be varied through a wide range without departing from the principles 'of this invention, and I therefore do not purpose limiting the patent granted otherwise than necessitated by theprior art.

I claim as my invention: f

The combination With the reinforcement rods of a concrete structure, of a head support comprising an aperturedframe, a plurality of Wires bent to Jform triangular legs,

the ends of which are hooked in the aper-Y tures of theframe, to support the frame with the reinforcement rods resting thereon, and Wires engaged through other of said frame kapertures adapted to be passed around said reinforcement rods to hold the,

same secured to said frame and properly 15 EARLEP. PRESS. Witnesses:

CHARLES W. HILLS, Jr., EARL M. HARDINE.

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