US799230A - Means for reinforcing concrete. - Google Patents

Description

No. 799,230. PATENTED SEPT. 12, 1905.

W. GABRIEL. MEANSPOR REINPORGING CONCRETE.

APPLICATION FILED OCT. 14,1904.

WITJVES SE S.

lVILLIAhI GABRIEL, OF DETROIT, MICHIGAN.

MEANS FOR REINFORCING CONCRETE.

Specification of Letters Patent.

Patented Sept. 12, 1905.

Application filed October 14, 1904. Serial No. 228,400.

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Be it known that I, W'ILLIAM GABRIEL, a citizen of the United States of America, residing at Detroit, in the county of W'ayne and State of Michigan, have invented certain new and useful Improvements in Means for Reinforcing Concrete, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to the art of reinforcing concrete by means of steel; and it is the particular object of my invention to produce a simple, cheap, and effective means for reinforcing concrete, so as to increase its tensile strength when used in the construction of beams, floors, ceilings, and the like. In the present state of the art steel bars of composite form, so called truss bars, have been devised for this purpose, which while more efficient than commercial forms of steel have also materially increased the cost, owing to added labor and cost of machinery for producing them and also on account of their bulkiness, which increases the transportation charges.

I have succeeded in producing a trussbar for the horizontal reinforcement of concrete which has special advantages in the matter of cost, as well as in efficiency, and which every building contractor can manufacture for himself in any quantity he desires without the use of costly machinery or dependence upon skilled labor and of any size he may find best suited for the particular work in hand, using nothing but commercial forms of steel, which he can procure most anywhere, or from material which has become unfit for other uses, all as more fully hereinafter described, and shown in the accompanying drawings, in which Figure 1 is a plan view of a truss-bar embodying my invention. Fig. 2 is a cross-section through a concrete slab reinforced with my truss-bars. Fig. 3 is a side elevation of Fig. l. l is a plan view of a modified form of construction.

In the drawings, A represents a bar of metal, preferably a solid round bar; but bars of other commercial forms may be used, or metal tubing which has ceased to be serviceable for other purposes will form a cheap and satisfactory substitute.

B represents two series of A-shaped stirrups continuously formed from one piece of steel wire or steel band and extending along the bar A in two planes intersecting each other at a right angle, or nearly so, comparable to the sides of a V shaped trough. These stirrups alternate with each other in the two planes and connect with each other by means of loops (1, formed by bending the wire around the bar, so that the connecting portions between adjacent stirrups form a complete loop around the bar, in which the bar is firmly held against any displacement. The ends of the wire forming the stirrups are fastened to the ends of the bar by making several turns with it around the bar or fastening them in any other convenient way.

As the construction of this bar is so simple, I deem it unnecessary to describe how it may be formed on a commercial scale, knowing that any skilled workman can readily devise simple appliances for the purpose, and which will permit him also to make bars of different length or with material of different sizes.

In truss-bars thus formed the material is not weakened in the slightest, as there are no abrupt bends, whereas if a composite trussbar is formed by cutting up a single bar the material is considerably weakened and often considerably injured, and such injury often escapes the most rigid inspection and may lead to disaster, while the fashioning of my bar cannot bring any possible injury to the material.

Considering the efficiency of my truss-bar when embedded in concrete, as shown in Fig. 2, it will be conceded that it does not interfere in the slightest with the work of filling in the concrete around and in contact with each portion of the bar, so that the cohesiveness of the mass of concrete is not liable to be impaired by careless work in filling in. It will also be understood that as the concrete becomes hard and set the bar becomes, in effeet, a truss, which may be rightly compared in its sustaining power as to the bending moment of the beam or slab of concrete in which it is embedded to that of a solid V-shaped bar of the same general cross-section as my skeleton bar has, and this strengthening effect is accomplished without any of the drawback which such a solid bar would have and at a small fraction of the cost of such a bar.

It is obvious that the bar A may be utilized as a tie-rod between the supporting floorbeams in floor construction, and it is also obvious that my construction of truss-bar per- Inits of placing two sets of bars crosswise each other, as there is a sufficient interval between the stirrups to do so.

Having thus fully described my invention, what I claim is 1. The herein-described composite bar for reinforcing concrete comprising a bar and a continuous piece of wire or its equivalent, said wire secured at its ends to the ends of the bar and wound around said bar at intervals apart and alternately in opposite directions, the wire between said intervals of winding being formed into stirrups which extend upwardly and outwardly from the bar and alternately on opposite sides thereof in two planes inclined toward each other in the form of a V and intersecting each other at a point directly above the bar.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM GABRIEL.

Witnesses:

Orro F. BARTHEL, OLIVER E. BARTHEL.

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