US1239649A - Concrete-reinforcement. - Google Patents

Description

G. B. WAITE.. cowcansnemroscfmswr. ,APPLICATION FILED JuLY 1. '1915.

4PanamaSepia, 11, 1917.

GUY B. WAiTE, or New YORK, n. Y.

CONCRETE-REINFORCEMENT.

i ,esacia Specification of Letters Patent. Patgnined Sept.' 11, 1917.

Application filed July 1, 1915. Serial-No. 37,493.

To all whom t may concern: Y Be it known that I, GUY B. WAITE, a citizen' of the United States, and resident of `New York, in the county of New York and State of New York, have invented certain ,new and useful Improvements in Concrete- Reinforcements, of which the followingis a specification. Y j

e The invention relates to improvements in concrete reinforcement for building construction; and the object thereof is to provide a metal fabric or frame particularly adapted to receive and resist the strains common in this class of work. The object also is to provide means for uniting the parts of the fabric in such manner as to preserve their normal j shape and maximum strength, whereby contraction of the connecting joints, stretch and slippage ofthe members and disintegration of the surrounding concrete is prevented, and the stresses in the composite structure localized to the best advantage.

In describing the invention in detail reference is had to the accompanying drawings, forming a part of this specification, and wherein like characters of reference are used to designate corresponding parts throughout the several views, and in which:

Figure 1 is a plan view of a metal reinforcement embodied in the present invention; Fig. 2, an end view thereof; and Fig. 3 is an enlarged view of a longitudinal tension-bar embedded in a concrete section, showing in cross section the transverse tierods.

In the drawings, the numerals 1 designate a plurality of longitudinally extending metallic tension-bars, which are preferably round in cross-section, and arranged in parallel relation to each other. Each bar 1 is provided with a series of elongated connecting slots 2, the same being elongated in the direction of the length of the bars, and said slots are adapted to receive the transverse tie-rods 3.

In forming the elongated slots 2, the metal fiber of the tension-bars is spread laterally to form the expanded, outwardly projecting, and relatively long side-walls or arches 4c, the ends of which gradually merge into the main portions of the bars. These projecting side-walls or arches constitute anchorages and retain the bars against movement or slip when they are embedded in the concrete, as shown at 5 in Fig. 3 of section adjacent the slots.

unseparated portions of the bar. tensile strength of the bars is not lessened as the drawing, and by forming the connection slots relatively long, or longer than the diameter of the transverse rods, to provide the long arches, the full tensile strength of the tension-bars is preserved, owing to the tapered ends of the slots causing the ends-of the arches to gradually merge into the inain portions of the bars. The gradual merging of the ends assures an unbroken continuationvof the metal fibers in the bars, and the Vnecessary long spreading or separation required to form the elongated slots, will not displace any of the metal from the cross- Therefore the combined cross-sectional area of each pair of oppositely disposed arches lremains equal to the cross-sectional area of the main or Thus the the cross-sectional area is the same throughout the entire length of the bars, and the metal bers are not ruptured by short and abrupt bending, but remain unbroken.

The transverse tie-rods 3 are Xed within the connection slots by compressing the sidewalls or arches upon the tie-rods after they have been positioned in the slots, and said tie-rods are furthermore secured against lateral displacement by the lock-loops 6, formed by bodily bending the transverse rods adjacent to and on opposite sides of the tension-bars. As thus constructed the arched joint-sections of the tension bars will be obviously as strong in tension as the other portions thereof, and the projecting anchorages will prevent movement of the bars in the concrete against compression or disarrangement under the ordinary working conditions.

I am aware that heretofore concrete reinforcements consisting of metal fabric have been employed wherein the members have been commonly united by twisting or looping one or both of the connecting parts. It has been found in practice that connections of this kind serve ineffectually as anchorages inasmuch as they are quickly stretched and displaced under ordinary tension, resulting in a slippage of the rods, a disintegration of the concrete and a general weakening of the composite structure.

It will be obvious that the present invention, in overcoming these difficulties, provides a construction wherein a minimum amount of material may be used for obtaining the required structural strength.

Copies of this patent may be obtained for What I claim as my invention and desire to secure by Letters Patent is:

1. A reinforcement for concrete struc` tures, comprising a series of metal `tensionbars arranged in parallel relation to each other, each of said bars being provided With a series of transverse openings which are elongated in the direction of the length of said bars and having relatively long arched portions on opposite sides of said openings, the cross-sectional area of each pair of arched portions being equal to the cross-sectional area of the main portions of the bars and the ends of said arched portions being gradually merged into said main portions to retain an unbroken continuation of the metal fibers and thereby preserve thel full tensile strength throughout the entire length n of the bars, and tie-rods extending at an angle to, and having the arches pressing thereon to iiXedly secure 1n them the corresponding elongated openings of said bars.

2. A reinforcement for concrete .strucJ tures, comprising a series of metal tension vbars arranged in parallel relation to each A other, each of said bars being provided with a series of transverse openings Which are elongated inthe direction of the length of Vthroughout the entire length of the bars,

and tie-rods extending at an angle Vto and engaged in corresponding elongated openings of the bars, said'arches being compressed upon the tie-rods and said tie-rods being bent bodily to form loops Vat each vside and adjacent to the tension bars to securely retain the barsand rods in position.

Signed -at 'New York, in the'connty of N ew York andState of New York, this 29th day of June, A. D.' 1915. y

GUY B. WAITE. Witnesses :Y l f (Inns. W. LARnn, JOHN A. EADEs.v

ve cents each, by addressing the Commissioner ofvPatents, Washington, D. C. Y 1 j`

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