US1335780A - Conobete building - Google Patents

Description

F M. BARTON.

CONCRETE BUlLDING.

APPLICATION man JULY 18, m1.

1,335,780. Pat ted Apr- 6, 1920.

3 SHEETS-SHEET I.

FIG v25: 1.

F. M. BARTON.

CONCRELE BUIUNNG. APPLICATION mm jun an; ml M 1,335,780. Patented Apr. 6, 1920.

3 SHEETS-SHEET 2- Fiaurz .4.

WITH Egg 5E5 IHVEHTOR yaw F. M BARTON.

CONCRETE auxwma.

APPLICATlON FILED JULY )8 I911,

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Patented Apr. 6, 1920.

3 SHEETS-SHEET 3.

FRANCIS M. BARTON,OF CHICAGO, ILLINOIS.

CONCRETE BUILDING.

To all whom it may concern Be it known that I, FRANCIS M. BARTON, a citizen of the United States, a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Concrete Buildings, of which the following is a full, clear, and exact description.

The invention relates more particularly to improvements in flat slab concrete floor, roof constructions and the like.

One object of the invention is to provide an improved metallic reinforcement over the column and for a flat slab floor in which the maximum value of the metallic rein.- forcement is attained by disposing the rods which constitute the reinforcement sothat they will resist in greatest degree the positive and negative bending moments and the diagonal tension or shearing stresses. This result is attained by providing crossed series or belts of rods which are disposed as near the top of the slab as possible and parallel thereto beyond the point of counter flcxurc, so that maximum efficiency in resisting positive bending moment Wlll result. and by providing a construction in which the belts of rods for resisting the positive bending moment will be disposed, as closely as pos-- sible and parallel to the bottom of the slab or floor so that maximum eiiiciency in resisting positive bending moment will result. and in providing means between the top and bottom belts of rods which will cilectively resist diagonal tension or shearing stresses.

Another object of the invention is toprovide a metallic reinforcement over the. col. umn in the slab which comprises as an entity a series of connected rods to facilitate placement into position in the course of construction of the building. By providing these connected series of rods or mats, the likelihood of irregular or improper placement and the resultant defective reinforcement, will be overcome. Furthermore by forming these mats so they will include means for sustaining the lower belts of rodsfor resisting the positive bending moment, convenient supporis are formed for lower belts of rods which insure proper placement vertically and latch-Ill in the structure.

A further object of the invention is to provide a concrete structure in which the reinforcement is simple, inexpensive, may

be readily placed in position and will of Specification of Letters Patent.

Application filed July 1Q, 1911.

Patented Apr. 6, 1920.

Serial No. 639,189.

ficiently serve to resist all the stresses to which the structure is usually subjected.

The invention consists in the several novel features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings; Figure 1 is a section through a floor, the column bein in elevation, embodying the invention. Fig. 2 is a detail lan of one of the metallic mats. Fig. 3 1s a plan showing the arrangement of the mats and slab reinforcement. F ig. 4 is a vertical section the columns being shown in elevation. Fig. 5 is a plan of a. modified form of the invention in which angularly disposed stirrups are employed in the capitals. Fig. (i is a vertical section on an enlarged scale of the form of .the invention shown in Fig. 5. Fig. 7 is a detail of one of the stirrups.

The improved construction comprises a flat floor slab (l of concrete, and columns B beneath the slab in desired number, according to the load to be carried by the floor. In theconcrete slab above each column, or between the superimposed columns. a metallic mat is disposed. Each of these mats is formed of rods and comprises two members A and A. Each member of this mat is formed of a long strip bent into sinuous form to provide a series of parallel rods connected by loops a at alternating ends. The rods of one member are disposed crosswise of the rods of the other member of the mat, so that this metallic reinforcement over the columns will have rods radiating or extending in four directions from the column, and there will be loops :1 at four sides of each mat. By employing mats of this character which comprise a large number of rods connected by integral loops, it is not neces: try l :r the workmen to exercise the great care necessary in separately laying a large number of metallic rods in order to bring each in its correct position to reinforce at the points desired. because the loops hold the rods of these mats in spaced relation. The mats can e more economically handled than sluii c rmh. ince they are made at the {aviary and. stripped to the place of bui ding. alvradr formed. In other Words. in lieu wt liav'a liu a large number of "ods. it is only r wcs arv for the Workmen to place a lo w "nl r o the mat in its true and row;- i ion over the col- 'umn or where the column is to be placed and then lay the other member of the mat on 1t, or if desired, the two mat-members may be secured together before they are placed in position and in that event, it is only necessary for the workmen to position the mat as an entirety.

The loops a respectively on the sides of the mat extend downwardly therefrom to provide rests or supports in close proximity to the bottom of the slab and around the mat. Rods D are supported by said loops and extend from mat to mat, the rods being laid in the loops. Diagonal slab-rods D extend between the centers of the columns and continuously over the several spans. important resultant feature of the employment of these mats with pendant loops or supportin -means at their sides, is that the reinforce rods for the top and bottom of the slab are invariably disposed in properlyspaced relation according to the thickness of the floor, and furthermore these loops being spaced laterally from one another serve to hold the bottom-rods in laterally spaced relation, during construction.

The rods constituting the mats are disposed close to the top of the slab and are parallel thereto to a point approximately Ipst beyond the point of counter-flexure.

his disposition is important when metallic rods extendin at right angles to one another are emp oyed, because in this disposition maximum value of the metal is attained and also maximum elliciency in resisting the negative bending moment. By disposing the belts of rods for resisting the positive bending moment in different directions between the columns and over them in substantial parallel relation to the bottom of the slab and asnear the bottom as practicable, maximum efliciency in resisting the positive bending moment will result so that by making it possible to derive maximum value from these rods, their diameter will be such as to permit that undue thickness of the slab will be avoided. In this manner great economy is effected by the invention.

The structure set forth and exemplifying the invention thus provides one in which the metallic reinforcement may be readily placed in position in the course of construction and in which the necessity of separately and accurately laying or supportin a large number of rods Wlll be avoide Furthermore by employin reinforcement consisting of series of ro s with pendant loops at the sides, a little care in the placement of these mats will insure proper placement of the entire reinforcement, because the belts of rods for resisting the positive bending moment which are disposed at the bottom of the slap are supported and positioned by the ilmats'.

Thejn'vention is not to be understood as Leaupeo restricted to details set forth, since these may be modified by the skilled mechanic within the scope of the appended claims without departing from the spirit and the scope of the invention. Figs. 5, 6, and I, illustrate a modified form of the invention in which stirrups J extend diagonally throu h the capitals of the columns, and are looped around the rods of the mat. These stirrups reinforce the capital and are disposed so as to distribute the strains where a floor is unevenly loaded, the stirrup at load side serving as a compression, while the stirrup on opposite side of the column is subjected to tensile stresses.

The construction disclosed is one in which the'slab reinforcement consists of belts or a series of parallel rods extending in four diametric directions from the column-head, and constitute what is generally known in the art as a four-Way? reinforcement, and in which the belts or series of rods forming the reinforcement over the column-head and near the top thereof extend in two diamctric directions only, and is of the charactor generally known as a two-Way reinforrcment. This avoids an excess of metal over the column-head and particularly in the lower portion thereof, which is advantageous in a flat slab floor.

What I claim is: l. A mat for a column head reinforcement in a flat slab floor construction, comprising members. each of which is formed a of a series of rods arranged in substantially parallel relation and in substantially a common plane and united at their alternate ends by end loops, the rods of one member crossing and overlying the rods of the other member, the looped ends of said rods being extended downwardly to the lower portion of the slab.

2. A reinforced concrete structure, comprisingcolumns, a flat slab floor, and mats for said columns, each of which comprises a lateral series of rods united at their alternate ends by end loops, the rods of one member ofsaid mat crossing and overlying the rods of the other member, the looped ends of said rods being bent downwardly, and bottom rods in the slab supported by said looped ends.

3. A reinforced concrete structure, comprising columns, a flat slab floor, and mats 'for column head reinforcement each of which is formed of a lateral series of rods united at their alternate ends by end loops, the rods of one member crossing and overlying the rods of the other member, the looped ends of one member being disposed between those of the other member, the loops of both members forming a circumferential series of supports around the mat,

and bottom rods in the slab su orted b said looped ends. PP y 'slab reinforcing 4. A mat member for a column hmd reinforcement in a Hat slab lloor connitruo tion, comprising a. strip bent into sinuous form to provide a SGllOS o l" substan tially parallel rods having connecting loops at alternalrends, said loops being, bent; downwardly to lie in the lower portion of the slab.

5. A reinforced concrete structure comprising columns, a flat floor, cyflumncolumn beyond the point of countcrflexure and having downwardly extending supporting means, and rode extending between the column head reinforcement adjacent the bot tom of the slab, held by said supporting means and terminating outwardly from the center of the column head and near the margin of thc column-head reinforcement.

6. A reinforced concrete structure comprising columns, a Hat slabfloor, column head reinforcement coniprlslng i'ods disposed near the top of the mg outwardly from the column beyond the point of counterflcxurc and having downwardly extending supporting means, and slab reinforcing rods adjacent the bottom of the slab and held in said me ans, some of said rods extending to the con ter of the column-hcads, and Others terminating outwardly from the center of the co lumn-head slab and extendand near the margin of the column-head rein Forcemen 7. A reinforced concrete structure, comprising columns, a flat slab floor, and reinforcmncnts comprising two-way rods over the columns in the tension zone near the top of the slabs and extending outwardly from the columns only slightly beyond the point of countcr-flexturc, Pour-way slab rods adjacent the bottom of the slab and extending betwemi the columns, and supporting ronnm'rtioim between the outer ends of said two-way rode and said four-way rods, the slab rods for Urn-way being non-coutinuone rnl'l' the columns.

8. A reinforced concrete structure, comprising columns, a Hat slab floor, and rcinl'orvcrncnts ('mnpllfillig two-way rods over the columns in the tension zone near the top of the slabs and extending outwardly from the columns only slightly beyond the point of counter-41cm:re, four-way slab rods adjacent the bottom of the slab and extending' between the columns, and supporting vonncctions between the outer ends of said two-way rods and said four-way rode, the two-way rode coi'istiluting the entire rein l'orcenmnt in t m teneion zone above the columns.

I RANClh M. BARTON. W it nesses S. ll, WEBS'IER, (Tons. Ti. MYERS.

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