US2116335A - Wrapping for structural shapes - Google Patents

Description

May 3, 1938. G. B. Bosco WRPPING FOR STRUCTURAL SHAFES Filed June l' 1957 Illl UNITED NSTATES PATENT Patented May 3, 1938 oFFicE y WRAPPiNG FOR STRUCTURAL sHAr-Es I George B. Bosco, Chicago, Ill. Application Jane 1, 1937, serial N0. 145,733

7 Claims.

f lThis invention relates to reinforcing systems for concrete construction work and more particularly to the wrapping used in concrete reproofing in connection with structural steel shapes, Vsuch as girders, beams, joists and columns.

'Ihe mainobjects of this invention are to provide an improved form of structural shape Wrapping which is adapted to be completely assembled together with the longitudinalv reinforcing rodsand attached to the soit form before the mold is assembled thereby insuring accuracy in the placement of thaw-rapping; to provide a wrapping having improved means for attaching the wrapping to the soflit form and for spacing the sofit form from the beam or other structural fshapeyto provide improved means for securing saidform spacing and attaching means to the transverse reinforcing wires of the wrapping; to provide improved means for attaching the wrapping to the longitudinal reinforcing wires; and to provide an improved wrapping of this kind which is simple and comparatively inexpensive and which may be accurately placed in proper position even by unskilled labor.

An illustrative embodiment of this invention is shown in the accompanying drawing, wherein1y Figure l is a fragmentary perspective of a beam mold showing a portion of one form of beam wrapping.

Figure 2 is a transverse section of a reinforced and iireproofed girder or beam with the improved wrapping embedded in the concrete, the form not yet having been dismantled Figures 3 and 4 are fragmentary perspectives of alternate forms of wrapping.

Figure 5 is an enlarged perspective of one of the improved spacers.

Figure 6 is a fragmentary perspective of the spacer attached to a transverse reinforcing bar.

In the construction shown, the improved wrapping is applied to a structural steel I-beam or girder I which is reproofed with concrete 2 which is poured into the usual temporary form comprising horizontal battens 3 arranged to support the usual soft form 4 and sides 5. The form sides 5 are usually nailed to the soit form 4 and braced by vertical battens 6 which are in turn secured against outward movement by kickers l'. The entire form is suspended from the I-beam by any suitable means, such as the band clamps 8.

In the form shown, the improved wrapping comprises a plurality of transverse reinforcing rods 9, of substantially identical construction, arranged in substantially parallel spaced relation (C1. 72ans) to each other and secured to supporting chairs IIJ I which also serve as form spacers.

The rods 9 are preferably formed of round Wire of uniform cross section which may vary in gauge depending upon the requirements.

The cross rod B is of sufficient length so that its ends may be wrapped around the edges of the adjacent flange of the I-beam and the extremities are looped as shown at II to minimize the danger of injury to the hands of the workmen in:

assembling the structure.

In the form shown in Figures 1 and 2, the wrapping is used in connection with three longitudinal reinforcing bars or rods I2, I3 and I4.

The centrally located bar I2 rests on top of the gle longitudinal reinforcing bar |22 is spot Welded to the cross rod 9.2.

The improved supporting and spacing chair I is preferably a sheet metal stamping which is bent to substantially U-shaped cross section, as illustrated in Figures and 6. Formed on the lower edge, is a pair of prongs IE adapted to be forced into the top surface of the soft form.

To prevent waste of material in the blanking operation, these supporting and spacing chairs are stamped from stripmaterial so that 4the prongs of one chair are formed from the material of an adjacent chair, thereby leaving recesses I1 in the upper edges of each chair. If desired these recesses Il may support additional cross bars.

Struck out from the chair, is a tapered lug I8 which forms a shoulder I9 on which the cross rod 9 is seated. After the cross rod has been dropped into its seat, the free'end of the lug I8 is bent over the rod as shown in Fig. 6, thereby iirmly securing the chair to the cross rod against displacement crosswise of the latter.

In operation, with this improved construction, the wrapping and reinforcing bars may be accurately placed on the sot of the form before the mold is assembled. After the soft and the assembled reinforcement is lifted into proper position, the band clamps 8 are fastened and the ends of the cross bars S are then Wrapped around the bottom flange of the I-beam. After the concrete has set and the mold is dismantled, the prongs I6 project beyond the face of the concrete but these may be readily cut off if desired.

It is obvious that this improved wrapping is equally well adapted for use in vertical columns. Although but certain specific embodiments of this invention have been herein shown and described, it will be understood that details of the construction shown may be altered without departing from the spirit of the invention as defined by the following claims.

I claim:

1. A reinforcing wrapping for application to a structural shape within a temporary form, comprising a transverse reinforcing bar adapted to lie between the shape and one of the form sides, and a separately formed spacer locked to said transverse bar against displacement crosswise of the latter and having portions thereof adapted to contact the structural shape and the form for spacing said bar from both the shape and the form.

2. A reinforcing wrapping for application to a structural `shape within a temporary form, comprising a transverse reinforcing bar adapted to lie between the shape and one of the form sides, and a separately formed spacer locked to said transverse bar against displacement crosswise of the latter and having its ends adapted to contact opposed surfaces of the structural shape and the form for spacing said bar from both the shape and the form.

3. A structural shape wrapping, comprising a ,plurality of flexible transverse reinforcing bars `adapted to have their ends bent over a portion of the structural shape, a longitudinal reinforcing rod secured to and spacing said transverse bars lengthwise of the structural shape, and spacing chairs attached to the respective transverse bars and provided with means for attachment to a form.

4. A reinforcing wrapping for application to a structural shape within a temporary form, comprising a plurality of parallel transverse reinforcing bars adapted to lie between the shape and one of the form sides, a longitudinal reinforcing rod secured to and spacing said transverse bars, and separately formed spacers respectively attached to said transverse bars and adapted to have a bearing on both the structural shape and the form for spacing said transverse bars from both the shape and the form.

5. A` reinforcing wrapping for application to a. structural shape within a temporary form comprising a plurality of laterally spaced flexible transverse reinforcing bars each formed with a loop therein and adapted to lie between the structural shape and one of the form sides, a longitudinal reinforcing rod overlying and attached to said transverse bars, another longitudinal reinforcing rod extending through the loops of said transverse bars, and a separately formed spacer attached to each transverse bar and adapted to have a bearing on both the structural shape and the form for spacing said transverse bars from both the shape land the form.

6. A reinforcing wrapping for application to a structural shape within a temporary form comprising a plurality of laterally spaced flexible transverse reinforcing bars each formed with a plurality of 4loops spaced lengthwise thereof and yadapted to lie between the structural shape and one of the form sides, a central longitudinal reinforcing rod overlying and attached to 'said transverse bars, a plurality of longitudinal reinforcing rods respectively extending through the loops of said transverse bars on opposite sides of said central rod, and a pair of separately formed spacers attached to each transverse bar and adapted to have -a bearing on opposed surfaces of the structural shape and the form for spacing said transverse bars from both the shape and the form.

'7. As a new `article of manufacture, a chair for supporting a transverse reinforcing bar and spacing the same from opposed surfaces of a structural shape and a temporary form, consisting of a sheet metal stamping bent to substantially U-shaped cross-section; said chair having squared ends, a flexible .struck-out lug on its convex side adapted to seat and embrace said reinforcing bar, a pair of alined notches in its sides adapted to seat another reinforcing bar, and a pair of pointed prongs on one end.

GEORGE B. BOSCO.

Images