Holder of connecting bars for providing a positive connection of

Details Holder of connecting bars for providing a positive connection of Holder of connecting bars for providing a positive connection of

1982-08-19

1986-01-07

Kelly, Donald G.

Static structures (e.g., buildings)

Cast in situ loading bearing monolith with coextensive...

52699, 52698, E04B 138

Patent

active

045626790

DESCRIPTION:

BRIEF SUMMARY
The invention starts from a holder of connecting bars for providing a positive connection of one structural member to another structural member to be concreted previously, with a basic part in which first sections of the connecting bars, to be connected to the one structural member, are accomodated, and a part covering these first sections and detachably connected to the basic part.
This connection may be a matter of joining structural members of different kinds, as is the case, e.g., in attachments of lines under a ceiling of a building or in the mounting of a facing on a concrete wall, or it may also have to do with a positive connection of two structural members concreted with a time lag, such as wall-to-wall, wall-to-stairs, or similar connections, for example. Such connections may be produced subsequently, e.g., by boring and doweling in the solid concrete wall, but they are often advantageously prepared in the first concreted structural member by incorporating the connecting elements even before the pouring of this part. In order to avoid apertures in the shuttering at such time, use is made of different kinds of holding elements, the majority of which aim at the formation of a cavity in the structural member to be concreted first, in which cavity the parts of the connecting elements, usually formed as connecting bars, are accommodated, which provide for the later connection of the structural member to be fastened on.
Such a holder in the form of a pan is already known from U.S. Pat. No. 1,798,134. Broken out in the bottom of the pan are openings through which the connecting loops are inserted in such a way that a portion of the loop which is to be bound into the structural member to be concreted first projects from the bottom of the pan, and the remaining portion of the loop, which is used for the later fastening-on of the structural member to be attached, is accommodated in the pan. This pan is secured to the shuttering with the bottom of the pan facing the concrete part, i.e., with the partially open side oriented towards this shuttering, and mounted. This subsequent removal of the pan from the hardened concrete is not reckoned with. Later developed devices, as known, for example, from French Patent Specification No. 71.21518 or German Disclosed Application No. 29 44 739, work on the same principle of the pierced bottom and the connecting bars stuck through, but serve merely as preserving elements which are removed after stripping. The preserving element according to DE-OS No. 29 44 739 has the shape of a closed hollow body of prismatic form.
The above-mentioned principle, in which the bottom of the holding device is mounted facing the concrete and in which the connecting bars must be stuck through via apertures in this bottom, renders the production of such connections very difficult. Not the boring, punching, or another kind of production of such apertures per se, but the insertion of the bars, usually bent at right angles, through these narrow openings, requires a great deal of work.
The following disadvantages are inherent in the holder according to DE-OS No. 29 44 739:
the length as well as the width of the hollow body cannot be changed, i.e., the hollow body, once manufactured, is invariable in its width and length and can be used only in the given dimensions upon re-use,
the manufacture of the hollow body is made more expensive by the presence of transverse sides, and
the work is likewise made more costly by the subsequent boring of holes for connecting bars in the breast part of the hollow body.
The task underlying the invention indicated in patent claim 1 is to eliminate the disadvantages of the known holders and to provide a form of the holder mentioned at the beginning such that the work and thus the manufacturing costs during the insertion of the connecting bars in the holders are minimized. Furthermore, at least a part of such a holder should be re-usable. The same parts should always be usable for different embodiments of the holder.
In a holder according to the generic clause of pat

REFERENCES:
patent: 2573345 (1951-10-01), Leedy
patent: 2754064 (1956-07-01), Voltz et al.
patent: 3609211 (1971-09-01), Van Herk
patent: 3708607 (1973-01-01), Brode et al.
patent: 3868804 (1975-03-01), Tantlinger
patent: 3894370 (1975-07-01), Parazader
patent: 4338757 (1982-07-01), Witschi et al.

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