US919273A - Reinforcing-truss for concrete structures. - Google Patents

Description

APPLICATION FILED KAY 22, 1908.

Patented Apr.' 20, 1909.

WITNESSES HERBERT WHITE, or YOUNGSTOWN, OHIO, ASSIGNOR TO THE COMPANY, or YOUNGSTOWN, orno,

* NITED STATES PATENT OFFICE.

GENERAL FIREPROOFING A CORPORATION OF OHIO.

REiNFonomG-TRUss FOR CONCRETE STRUCTURES.

Specification of Letters Patent.

Patented April 20, 1909.

Application and May 22, 1908. Serial No. 484,236.

To all whom it may concern:

Be it known that I, HERBERT l nrrn, (if Youngstown, Mahoning county, Ohio, have invented a new and useful Reinforcing-Truss for Concrete Structures, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this claims.

specification, in whiche Figure 1 is a side view of one form of truss embodying my invention; Fig. 2 is a similar .view of'a portion of the same on a larger scale;.and Figs. 3, 4 and 5 are detail views hereinafter referred to; and Fig. 6 is a side view showing a modification.

My invention has relation to reinforcing trusses for concrete structures, and is designed to provide a novel and efficient form of truss for this purpose.

The precise nature of my invention will be best understood by reference; to the accompanying drawings, in which I have illustrated one form thereof, and which will now be described, it being that various changes may be made in the details of construction without departing from the spirit and scope of my invention as defined in the appended In accordance with my invention, the tension member of the truss is formed by two or more superimposed bars 2 and 2 which are provided each with longitudinal grooves 3 on their lateral surfaces, thus making the bar of I-beam section. The bars 2 and 2* may be tied together in any suitable manner, as by the ties 5 wrapped around them, as shown, the end ties being closely adjacent to the points where the end portions of the. bar 2 are bent upwardly. 'lheeud portions of the upper bar 2 are bent obliquely upward as shown at (3, and, in the form shown in F 1, their free ends are bent backwardly over and parallel with the tension member of the truss to form the compression members 7. That is to say, these members act mainly as compression members, but at the ends of the beam, they act as tension mem-' indicated in Fig. 1, but this may be omitted premised, however,

and arrangement where sired.

11 designates the oblique bracing members of the truss, which are preferably formed of flat shapes or sections. The end portions of these bracing members are bent inwardly into, engagement. with the in the tension members, and are secured therein by upsetting the metal of one or both walls of 'said grooves into locking engagement with-the bent lips at the ends of the bracing members, as indicated at 12. To provide for this locking engagement, these bent end portions or lips are preferably provided with recesses or depressions 12*, as best shown in Fig. 4:, into which the upset portions 12- are forced by the upsetting opera- ,tion. The bracing members aresecured in this manner at their lower ends to thc'lower tension bar 2 and some of them are preferably tied to the means of wires 13 which are looped'thereover with their end portions secured in the grooves of said-bar by upsetting the metal over them, as indicated at 13*. Thedoracing members 1.1 are preferably so arranged that adjacent members will be alternately at opposite sides of the truss, that is to say, looking at Fig. 1, one of the bracing members is at'the frontside of the truss while the next bracing member is at the rear side.

. 14' designate chairs in the form of clips Wl'iOSQ ends are secured in the grooves of the lower tension bar. These chairs are for the purpose of holding the frame away from the forms in building the reinforced structure, to permit the concrete to flow underjthe truss and thus form fire protection at the under side. of the beam or girder.

In the form shown in Fig. 6, the compression members are omitted, and such of the bracing members as cross the oblique por (ions (3 are tied thereto byties 1 3 which are similar to the tics 13 before described.

The ad .antages of my invention will be apparent to those skilled in the art, since it provides a reinforcing truss-possessing great strength, and which can be readily built up. The nmnner of securing the bracing members to the tension and compression members of the tenings, and provides for a simple and secure connection of these'parts.

' \Vhat I claim is 2- 1. A reinforcing truss for concrete having lateral grooves 53 upper tension bar 2 by truss avoids the use of separate fasobliquely upwardly and then bent backwardly bers,

over and parallel with the tension members to form compression members, and bracing of separate 1 members having their ends bent between the flanges of the I-beam sections and secured therein by upsetting of the metal of said flanges together with means for securing togetherthe separate superimposed bars; substantially as described. I

ZJA reinforcing truss for concrete structures having a. tension member composed of two superimposed bars of I-beam section, the upper of said bars having its end portions extended obliquely upward and thence bent back over and parallel with the main portion of the bar to form compression memand bracing members having their upper ends secured between the flanges of the compression members and their lower ends secured between the flanges of the lower tension members and also secured to the upper tension member together with means for thus securing the bracing members to the up per tension member; substantially as de scribed.

A reinforcin its tension member composed of two superimposed bars of I-beam section, and bracing members having their lower ends bentinto engagement with and'secured between the flanges of the lower tension bar and tie members secured between thetlanges ot' the upper tension bar and tying the braces thereto; substantially as described; I 4-. In a reinforcing truss for concrete, a tension member posed grooved bars, having their lower ends secured in the grooves of the lower bar and ties secured in the grooves of the upper of'said members thereto; subst scribed.

In a reinforcing laterally grooved tension member, bracing members,secured to said tension i'uember,

bar and tying some antially as dei truss tor concrete, a

truss tor concrete, having composed oftwo superim and 1 bracing members and tie clips extending over the bracing;

members and secured in grooves; ot the ten- 1 as described. ha ve hereunto set sion member. substantially In testimony whereof, I

- my hand. i 1

. Hlfltl) EltT E. \VHTTE. v Witnesses I I H. R. Grain), v Gr. D. lvL-moim'uar.

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