Dowel support for bent-up reinforcement bars and process for the

Details Dowel support for bent-up reinforcement bars and process for the Dowel support for bent-up reinforcement bars and process for the

1998-10-13

2000-04-25

Friedman, Carl D.

Static structures (e.g., buildings)

Machine or implement

52334, 52414, 52600, 527242, E04C 320, E04C 500

Patent

active

060529628

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a studrail for shear reinforcement in reinforced concrete slabs, consisting of a spacing rail and a plurality of parallel spaced studs that are clamped at one end by the rail. The studs consist of a shaft with disc shaped heads formed at both ends.
Shear reinforcement consisting of studrails are used in reinforced concrete slabs or beams in the area of supports, especially in the area of slab-column connections to resist the shear forces in the support area caused by the column reactions and as such serves as punching shear reinforcement.
The known studrail of the above-mentioned type (EP 0 495 334 B1) features studs with disc shaped heads only at one end and are welded to the rail at the other end. The production of the studrail is therefore rather elaborate. The heat generated by the welded connection may lead to a warping of the spacing rail, which must be straightened afterwards. Through the welding process, changes of material properties might occur in the stud that can lead to a reduced load bearing capacity.
The aim of the invention is therefore to develop the above-mentioned type of studrail such that the production is simplified and the welding is eliminated.
This objective is achieved by the invention by using a profiled sheet metal channel as the spacing rail, the base plate of which is in contact with the top face of the head of the stud and the folded flanges of the channel are enclosing the opposite edges of the head of the stud.
Herewith a simple tightly fitting connection between the studs and the spacing is achieved without any welding. Thus no heat-induced changes in the material properties occur in the stud head. A subsequent straightening of the studrail is not necessary because no warping will occur since there is no heat generated by the connection. The studrail can be readily produced in any length, can be easily stored and shipped, without the hazard that the spacing or alignment of the individual studs is changed.
The purely mechanical attachment of the stud and the spacing rail enables the selection of different material properties of the rail and the stud. This in particular facilitates the production of a stainless steel studrail. Since there is no possibility of corrosion of stainless steel, the required concrete cover beneath the spacing rail can be reduced in this case.
In their preferred form, the flanges of the channel enclose the edges of the stud head in a clamping manner. Alternatively, provisions could be made that each stud head has a limited movement along the spacing rail to allow the spacing of the studs to be adjusted after fabrication.
According to a preferred form, it is planned that on the base of the channel cross-section a projecting stop for the stud heads is provided at equal distances along the length of the channel. These stops could be lips punched out of the profile base and bent through an angle against which a stud head is held during the assemblage. Herewith an exact positioning of the studs is guaranteed.
The stops could also be projections that engage into a recess of a stud head. Those projections could be produced with a center-hole punch.
According to another advantageous form of the invention it is planned that openings are provided in the base plate of the channel. Thus an intense connection with the surrounding concrete is achieved.
In the base plate of the channel openings can be provided to support chairs. If the chairs are attached to the rail in such openings the same chairs can be used for different rail width, which means a simplification of storage. The openings can be elongated so that the chairs can be moved in the direction of the rail to facilitate an adjustment of the rail after the chair is attached to the formwork.
According to an advantageous modified form of the invention it is envisioned that the edges of the flanges of the spacing rail have edge strips bent outward. This arrangement will have the effect that the concrete in the area of the stud head and especially at the underside of the stud head, wh

REFERENCES:
patent: 4406103 (1983-09-01), Ghali et al.
patent: 5655349 (1997-08-01), Ghali et al.

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