US1072532A - Reinforced concrete construction. - Google Patents

Description

c. A; P; TURNER. REINFORCED CONCRETE CONSTRUCTION.

' APPLIOATION FILED APR.17, 1912.

- Patented Sept.9,1913. N I 6..

\II. BY I c ATTORNEY canons A. r. anemia or mums-roars, iaxmmso'ra" 'ariaroacnr meme consr'iwcrron.

ima'ss'a Continuation of application Serial No; 1305,; filed winery 19, 1911.

-- 19:2. serial No. 691,278.

application No. 693,562, filed January 19,

1911, and. is addressed particularly to the subject-matter disclosed, but not claimed in the-said application, which has to do with the form of reinforcement in the slab overthe columns or piers, when the slab is supported by means of columns or piers, the object of my invention, in that behalf, being to provide an efficient arrangement ofreine forcementwhich will take care of the pecul I iar radial and circumferentialstresses which develop under a load that tends to bend a circular section of the floor concentric with the support downward and which results in stretching or straining the fibers in the upper tension zone both radially and circumferentially.

In the accompanying drawingsFigure 1 is a top plan viewof acolumn-suppo-rted floor slab embodying one form of my invention; Fig. 2 is a vertical section on a larger.

scale throu'gha portion of the slab and portions of contiguous columns; and Fig. 3 is.

a' similar View showing a different of the spiral cant aliver head.

In the farm of my invention shown inthe drawings, the fiat floor slab 10 of reinforced concrete is supported'by' reinforced concrete columns 11,the slabreinforcement comprehending belts ofrods 12 runningdirectly 40 from column to column in the shortest directions, and diagonally from column to column forming a four way reinforcement, and

a circular, openwork framework 13 concentric withthe slab center between supports.

No claim is made-hereiii to the arrangement location of the slab reinforcement as that forms the subject ofthe parent application.

Concentric with each column in the tension zone of the'slab above, the column, is a wide-spreading cantaliver headin the form of a flat, or substantially flat spiral lthat" is concentric with the column and extends beyond the'sameinto the slab, and said head- Specification of hettersfatent. -Pathtgd$ ;pt,9,1913

This muses filed April 17,

the slab rods or below them.

' The eantaliver-head forming spirals differ substantially from aseries of concentric rings, such as has heretofore been used, as will be'evident from the'following In of the column the spiral'tends through its diameter, to; transfer this unequal stress toward the column centeror support, whereas rings no action of this kind, except through the concrete or other reinforcement canoe even were the rings tiedtogether with radial .to the tension in the spiral as against merely such as a radial rod. My fiat spiral clearly differs from the axially elongated; spiral which isused for column'reinforcement, in

crete which is essentially in compression tion of the fiat coil is to throw compression into the'concrete or ofiset to some .extent tension actually existing therein due to the nature of the bending stress in the slab.

As shown in Fig, 2, the spiral 14 has all other atthe columns, while as shown in vFig.

.rods cross above the spiral 14. i 1

Having thus described myinve-ntion what I claim iscrete, comprising fioor' slab reinforcement, slab-supporting column and -i cantaliver heads comprising each a "spiral rod situated wholly between the planes of-the top and rods, because the action of the spiral would. be to draw together or cause a certain amount of compression in the concrete ,due

causing some tension in a radial member,

3the spirall t dips down-slightly toward its rim so that the coils do .not all lie in the same horizontal plane and the belts of slab is crossed by the helts of slab rods. The head-forming spirals 14 may be either above the column or a spiral which increases in' diameter around the capltal acts on com and merely-to hold the concrete in place or restrain it under compression, while the accases of unequal stresses on diflerent sides continuous-form, with the coils reducing in in the case of a series of mereconcentric cur, nor would the action of the spiral be exactly identical .with the concentric ring'7o its coils in the same plane and it lies above the slab rods which intersect or cross each.

1. 'An arrangementbf reinforcement for a. column-supported flat plate floor of 0011-.

25 combination of a floor slab, a slab reinforce,

bottom of the slab above the column, and extending into the slab beyond the column, the slab reinforcement also extending above the column so that the slab at the column 5 has embedded in it the spiral rod forming the .-.5 slab reinforcement consisting of belts of rods that extend from column to column and cross each other and cross said cantaliver heads where the said belts cross each other. 3. In reinforcedconcrete constructiomthe 'ment therefor, slab supporting columns, and a supporting'head for'each of said columns that supports the slab reinforcement consisting of a spiral rod whose coils are in substantially the same horizontal plane.

4. In reinforced concrete construction, the

combination of a floor slab, a slab reinforcemefi't therefor, slab supporting columns, and a column head consisting of a spiral whose coils are in substantially the same horizontal plane crossed by said slab reinforcement. 5. In reinforced concrete construction, the combination of a floor slab, slab supporting columns, a column head consisting of a spiral rod whose coils are in substantially the same horizontal plane, crossedby sai'd slab reinforcement, the latter consisting of groups of rods running in multiple direc-. tions crosswise of the column heads.

In testimony that I claim the foregoing I have hereunto set my hand.

CLAUDE A. P. TURNER.

Witnesses:

CHAS. J. WILLIAMSON, JAMES H.--MARR.

Copies of this patent may be obtained m five cents each, by addressing the commjssloizer of Patents,

t Washington, D. 0.

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