Static structures (e.g. – buildings) – With means – Corrugated
Patent
1995-01-30
1996-12-24
Friedman, Carl D.
Static structures (e.g., buildings)
With means
Corrugated
52260, 52334, E04F 1312
Patent
active
055864180
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a composite construction having a beam part and, bearing thereon, a slab part, the construction comprising a combination of at least the following components: casting form and being made up of an upwardly open profile which has longitudinal surfaces and a portion between them; mantle, make up the reinforcement of the composite construction; and the metal mantle and with the additional reinforcement components left inside the cast component, makes up the composite construction.
This application relates to a composite construction of steel and a concrete material, in which the bond between the concrete and the steel is sufficient to ensure that these two materials having different properties will act together. As such, traditional reinforced concrete is a composite construction, but according to present-day practice, by a composite construction is understood a combination of steel components or thin sheet components and of concrete or reinforced concrete. Justification for the use of composite constructions is found in advantages which are both structural and derived from the construction method; if correctly exploited, these advantages provide cost efficiency as compared with more conventional steel or reinforced concrete constructions. In terms of cost efficiency it is to be noted that one of the most advantageous methods of reinforcing concrete is to use reinforcement made of reinforcement steel. The price per kilogram of an installed steel sheet or thin sheet structure is in general higher than that of installed reinforcement bars. Furthermore, the strength level of reinforcement bars is higher than that of the steel sheet products used in construction. Mere replacing of the reinforcement bars with other steel profiles is thus in itself not a sensible objective. On the other hand, when the steel structure serves as a casting form which will remain in place, and serves at the same time as part of the reinforcement, it is possible to obtain an advantageous end result.
Several composite constructions of this type have been presented. Finnish patent publication 63465 discloses a system in which the entire lower surface of a cast intermediate floor consists of a continuous thin metal sheet, which thus serves as both the form and as a reinforcing component for the completed construction. Since in this the metal sheet constitutes the most essential component of the reinforcement, the construction is not safe in a fire situation, since the base made up of metal sheet will in this case be exposed to fire. Furthermore, in this construction the metal sheet which makes up the form tends, under load, to become detached from the concrete, whereby its reinforcing effect is lost. The publication does not describe any mechanism ensuring the bond between the metal sheet and the concrete.
Finnish patent 76401 describes a composite construction beam part from the lower surface of which there projects a bonding mechanism for bonding with the concrete. However, the manufacture of the bonding mechanism described in the publication is a relatively complicated work step. The surface of the metal mantle itself has not been made use of in producing the bonding, required by the composite effect, between the concrete and the steel component, and the shape of the profile is not such as to prevent the mantle from becoming detached from the concrete. Furthermore, the system is such that the construction cannot conveniently be made to continue over supports. Thus the arrangement described is in practice applicable only to relatively narrow and high beam parts, which limits the uses of the construction. Furthermore, the reinforcement system in the publication is such that it is interrupted in the area of a vertical column arranged in the area of the beam part, in which case such areas require special steps to be taken, not disclosed.
The object of the present invention is to provide a composite construction in which the bonding, presupposed by the composite effect, between the concrete and the metal mantle is sub
REFERENCES:
patent: 2006070 (1934-01-01), Di Stasio
patent: 3397497 (1968-08-01), Shea et al.
patent: 3812636 (1974-05-01), Albrecht et al.
patent: 4211045 (1980-07-01), Koizumi et al.
patent: 4333285 (1982-06-01), Koizumi et al.
patent: 5050358 (1991-09-01), Vladislavic
Official Action in corresponding Polish patent application No. P 306852.
Copy of International Preliminary Examination Report.
.ANG.lander Casper
Mononen Tarmo
Friedman Carl D.
Horton-Richardson Yvonne
Rautaruukki Oy
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