Static structures (e.g. – buildings) – Cast in situ loading bearing monolith with coextensive...
Patent
1980-07-14
1982-09-28
Bell, J. Karl
Static structures (e.g., buildings)
Cast in situ loading bearing monolith with coextensive...
52709, E04B 141
Patent
active
043511392
DESCRIPTION:
BRIEF SUMMARY
In the past, of two (non-reinforced) concrete structural members that were to be cast one after the other, the second one has simply been cast contiguous to the first one, whereby a connection was achieved which was not very strong. In order to obtain greater strength, at the location of the first concrete structural member to which the second one was supposed to link up, depressions have been formed upon the casting or been produced subsequently. When the second concrete structural member was being cast, the concrete thereof also filled up the depressions. In this way, projections engaging into the depressions were formed on the second concrete structural member.
The strength of the connection depended on the number, shape and size of the projections, but was less than the strength of the concrete structural members themselves. In the case of reinforced concrete structural members, reinforcing bars of the reinforced concrete structural member that was to be cast first were caused to project, at the intended connection point, through holes bored into the shuttering, in order then to embed them into the reinforced concrete structural member that was to be cast subsequently. In this way, a very strong connection was achieved. However, the reinforcing bars partially jutting out already upon the placing of the reinforcement for the first reinforced concrete structural member and then upon the casting, setting and removal of the shuttering from the same were troublesome and the cause of accidents. To avoid these disadvantages it is known (Swiss Pat. No. 562,376) to embed reinforcing bars, bent in U-shaped manner and having bent limbs, in such a way into a foam material body that the U-stirrups jut out at one side of the body, to fasten the body by its opposite side to the inner surface of the shuttering for the structural member to be cast first of all, to scrape the foam material out after the concrete has set, and then to bend the limb ends in such a way that they project from the first structural member, in order to embed them into the second structural member. The production of the foam material body with the embedded bent limb ends, the scraping out of the foam material and the bending back of the bent limb ends is, however, complicated.
The problem underlying the invention is to connect concrete or reinforced concrete structural members that are to be cast one after the other (for example two walls, two ceilings or one wall and one ceiling) securely to one another in a simple manner requiring little working time as a result of economical connecting elements which are not bulky upon their storage and upon transportation, and to avoid as long as possible reinforcing parts which protrude from the first structural member.
In accordance with the invention, this problem is solved by the connecting element in accordance with Patent claim 1.
The connecting elements in accordance with Patent claims 2 to 15 are further developments of the invention. More especially with the connecting element in accordance with Patent claim 5 the result is achieved that the latterly cast structural member is given, at the connection point, projections which engage into depressions which have come about in the case of the previously cast structural member, whereby the shear strength of the connection is increased. In the case of the further development in accordance with Patent claims 5 and 6, additionally also the tensile strength of the connection is increased.
Exemplified embodiments of the connecting element in accordance with the invention, and the uses thereof, are shown in the drawings, in which:
FIG. 1 shows a perspective view of a connecting element;
FIG. 2 shows a rear view of a component part of the connecting element, in the direction looking from the left in FIG. 1;
FIG. 3 shows a front view of the component part, in the direction looking from the right in FIG. 1;
FIG. 4 shows a diametral section through a detail from FIG. 1;
FIGS. 5 and 6 show two sectional views, at right angles to one another, of a concrete or reinfo
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patent: 1777926 (1930-10-01), Lilland
patent: 3890758 (1975-06-01), Bouchard
patent: 3958382 (1976-05-01), Walt
patent: 4007563 (1977-02-01), Nakagawa
patent: 4024688 (1977-05-01), Calini
Armex AG
Bell J. Karl
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